Update Russian translation

Signed-off-by: Hardcore Sushi <hardcore.sushi@disroot.org>

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "libpdfviewer"]
 	path = libpdfviewer
 	url = https://forge.chapril.org/hardcoresushi/libpdfviewer.git
+[submodule "app/libcryfs"]
+	path = app/libcryfs
+	url = https://forge.chapril.org/hardcoresushi/libcryfs.git

BUILD.md

@@ -0,0 +1,116 @@
+# Introduction
+DroidFS relies on modified versions of the original encrypted filesystems programs to open volumes. [CryFS](https://github.com/cryfs/cryfs) is written in C++ while [gocryptfs](https://github.com/rfjakob/gocryptfs) is written in [Go](https://golang.org). Thus, building DroidFS requires the compilation of native code. However, for the sake of simplicity, the application has been designed in a modular way: you can build a version of DroidFS that supports both Gocryptfs and CryFS, or only one of the two.
+
+Moreover, DroidFS aims to be accessible to as many people as possible. If you encounter any problems or need help with the build, feel free to open an issue, a discussion, or contact me by [email](mailto:hardcore.sushi@disroot.org) or on [Matrix](https://matrix.org): @hardcoresushi:matrix.underworld.fr
+
+# Setup
+Install required packages:
+```
+$ sudo apt-get install openjdk-11-jdk-headless build-essential pkg-config git gnupg2 wget apksigner
+```
+You also need to manually install the [Android SDK](https://developer.android.com/studio/index.html#command-tools) and the [Android Native Development Kit (NDK)](https://developer.android.com/ndk/downloads) (r23 versions are recommended).
+
+If you want a support for Gocryptfs volumes, you must install [Go](https://golang.org/doc/install) and libssl:
+```
+$ sudo apt-get install golang-go libssl-dev
+```
+The code should be authenticated before being built. To verify the signatures, you will need my PGP key:
+```
+$ gpg --keyserver hkps://keyserver.ubuntu.com --recv-keys AFE384344A45E13A
+```
+Fingerprint: `B64E FE86 CEE1 D054 F082  1711 AFE3 8434 4A45 E13A` \
+Email: `Hardcore Sushi <hardcore.sushi@disroot.org>`
+
+# Download sources
+Download DroidFS source code:
+```
+$ git clone --depth=1 https://forge.chapril.org/hardcoresushi/DroidFS.git
+```
+Verify sources:
+```
+$ cd DroidFS
+$ git verify-commit HEAD
+```
+__Don't continue if the verification fails!__
+
+Initialize submodules:
+```
+$ git submodule update --depth=1 --init
+```
+[FFmpeg](https://ffmpeg.org) is needed to record encrypted video:
+```
+$ cd app/ffmpeg
+$ git clone --depth=1 https://git.ffmpeg.org/ffmpeg.git
+```
+If you want Gocryptfs support, you need to download OpenSSL:
+```
+$ cd ../libgocryptfs
+$ wget https://www.openssl.org/source/openssl-1.1.1w.tar.gz
+```
+Verify OpenSSL signature:
+```
+$ wget https://www.openssl.org/source/openssl-1.1.1w.tar.gz.asc
+$ gpg --verify openssl-1.1.1w.tar.gz.asc openssl-1.1.1w.tar.gz
+```
+Continue **ONLY** if the signature is **VALID**.
+```
+$ tar -xzf openssl-1.1.1w.tar.gz
+```
+If you want CryFS support, initialize libcryfs:
+```
+$ cd app/libcryfs
+$ git submodule update --depth=1 --init
+```
+
+To be able to open PDF files internally, [pdf.js](https://github.com/mozilla/pdf.js) must be downloaded:
+```
+$ mkdir libpdfviewer/app/pdfjs-dist && cd libpdfviewer/app/pdfjs-dist
+$ wget https://registry.npmjs.org/pdfjs-dist/-/pdfjs-dist-3.8.162.tgz
+$ tar xf pdfjs-dist-3.8.162.tgz package/build/pdf.min.js package/build/pdf.worker.min.js
+$ mv package/build . && rm pdfjs-dist-3.8.162.tgz
+```
+
+# Build
+Retrieve your Android NDK installation path, usually something like `/home/\<user\>/Android/SDK/ndk/\<NDK version\>`. Then, make it available in your shell:
+```
+$ export ANDROID_NDK_HOME="<your ndk path>"
+```
+Start by compiling FFmpeg:
+```
+$ cd app/ffmpeg
+$ ./build.sh ffmpeg
+```
+## libgocryptfs
+This step is only required if you want Gocryptfs support.
+```
+$ cd app/libgocryptfs
+$ OPENSSL_PATH="./openssl-1.1.1w" ./build.sh
+ ```
+## Compile APKs
+Gradle build libgocryptfs and libcryfs by default.
+
+To build DroidFS without Gocryptfs support, run:
+```
+$ ./gradlew assembleRelease -PdisableGocryptfs=true
+```
+To build DroidFS without CryFS support, run:
+```
+$ ./gradlew assembleRelease -PdisableCryFS=true
+```
+If you want to build DroidFS with support for both Gocryptfs and CryFS, just run:
+```
+$ ./gradlew assembleRelease
+```
+
+# Sign APKs
+If the build succeeds, you will find the unsigned APKs in `app/build/outputs/apk/release/`. These APKs need to be signed in order to be installed on an Android device.
+
+If you don't already have a keystore, you can create a new one by running:
+```
+$ keytool -genkey -keystore <output file> -alias <key alias> -keyalg EC -validity 10000
+```
+Then, sign the APK with:
+```
+$ apksigner sign --out droidfs.apk -v --ks <keystore> app/build/outputs/apk/release/<unsigned apk file>
+```
+Now you can install `droidfs.apk` on your device.

DONATE.txt

@@ -0,0 +1,20 @@
+-----BEGIN PGP SIGNED MESSAGE-----
+Hash: SHA256
+
+Here are the DroidFS donation addresses:
+
+Monero (XMR):
+
+86f82JEMd33WfapNZETukJW17eEa6RR4rW3wNEZ2CAZh228EYpDaar4DdDPUc4U3YT4CcFdW4c7462Uzx9Em2BB92Aj9fbT
+
+Bitcoin (BTC):
+
+bc1qeyvpy3tj4rr4my5f5wz9s8a4g4nh4l0kj4h6xy
+
+-----BEGIN PGP SIGNATURE-----
+
+iHUEARYIAB0WIQS2Tv6GzuHQVPCCFxGv44Q0SkXhOgUCZNuhaAAKCRCv44Q0SkXh
+OqEUAP0d67oFlGp5IlBHwNI/p2KMHka3LzHdQTBQs40Jus3tVQEAsTZEy/sc6Nwp
+C8mAXUTebijFgrlYYQkfVS0RBXHwggo=
+=E6ia
+-----END PGP SIGNATURE-----

README.md

@@ -1,52 +1,75 @@
 # DroidFS
-DroidFS is an alternative way to use encrypted overlay filesystems on Android that uses its own internal file explorer instead of mounting virtual volumes.
+An alternative way to use encrypted virtual filesystems on Android that uses its own internal file explorer instead of mounting volumes.
-It currently only works with [gocryptfs](https://github.com/rfjakob/gocryptfs) but support for [CryFS](https://github.com/cryfs/cryfs) could be added in the future.
+It currently supports [gocryptfs](https://github.com/rfjakob/gocryptfs) and [CryFS](https://github.com/cryfs/cryfs).
+
+For mortals: Encrypted storage compatible with already existing softwares.
 
 <p align="center">
 <img src="https://forge.chapril.org/hardcoresushi/DroidFS/raw/branch/master/fastlane/metadata/android/en-US/images/phoneScreenshots/1.png" height="500">
-<img src="https://forge.chapril.org/hardcoresushi/DroidFS/raw/branch/master/fastlane/metadata/android/en-US/images/phoneScreenshots/2.png" height="500">
+<img src="https://forge.chapril.org/hardcoresushi/DroidFS/raw/branch/master/fastlane/metadata/android/en-US/images/phoneScreenshots/4.png" height="500">
-<img src="https://forge.chapril.org/hardcoresushi/DroidFS/raw/branch/master/fastlane/metadata/android/en-US/images/phoneScreenshots/3.png" height="500">
+<img src="https://forge.chapril.org/hardcoresushi/DroidFS/raw/branch/master/fastlane/metadata/android/en-US/images/phoneScreenshots/6.png" height="500">
 </p>
 
+# Support
+The creator of DroidFS works as a freelance developer and privacy consultant. I am currently looking for new clients! If you are interested, take a look at the [website](https://arkensys.dedyn.io). Alternatively, you can directly support DroidFS by making a [donation](https://forge.chapril.org/hardcoresushi/DroidFS/src/branch/master/DONATE.txt).
+
+Thank you so much ❤️.
+
 # Disclaimer
 DroidFS is provided "as is", without any warranty of any kind.
 It shouldn't be considered as an absolute safe way to store files.
 DroidFS cannot protect you from screen recording apps, keyloggers, apk backdooring, compromised root accesses, memory dumps etc.
 Do not use this app with volumes containing sensitive data unless you know exactly what you are doing.
 
+# Features
+- Compatible with original encrypted volume implementations
+- Internal support for video, audio, images, text and PDF files
+- Built-in camera to take on-the-fly encrypted photos and videos
+- Unlocking volumes using fingerprint authentication
+- Volume auto-locking when the app goes in background
+
+_For upcoming features, see [TODO.md](https://forge.chapril.org/hardcoresushi/DroidFS/src/branch/master/TODO.md)._
+
 # Unsafe features
-DroidFS allows you to enable/disable unsafe features to fit your needs between security and comfort.
+Some available features are considered risky and are therefore disabled by default. It is strongly recommended that you read the following documentation if you wish to activate one of these options.
-It is strongly recommended to read the documentation of a feature before enabling it.
 
 <ul>
   <li><h4>Allow screenshots:</h4>
   Disable the secure flag of DroidFS activities. This will allow you to take screenshots from the app, but will also allow other apps to record the screen while using DroidFS.
+
   Note: apps with root access don't care about this flag: they can take screenshots or record the screen of any app without any permissions.
   </li>
-  <li><h4>Allow opening files with other applications *:</h4>
-  Decrypt and open file using external apps. These apps could save and send the files thus opened.
-  </li>
   <li><h4>Allow exporting files:</h4>
   Decrypt and write file to disk (external storage). Any app with storage permissions could access exported files.
   </li>
-  <li><h4>Allow sharing files via the android share menu *:</h4>
+  <li><h4>Allow sharing files via the android share menu*:</h4>
   Decrypt and share file with other apps. These apps could save and send the files thus shared.
   </li>
-  <li><h4>Keep volume open when the app goes in background:</h4>
-  Don't close the volume when you leave the app but keep running it in the background. Anyone going back to the activity could have access to the volume.
-  </li>
   <li><h4>Allow saving password hash using fingerprint:</h4>
   Generate an AES-256 GCM key in the Android Keystore (protected by fingerprint authentication), then use it to encrypt the volume password hash and store it to the DroidFS internal storage. This require Android v6.0+. If your device is not encrypted, extracting the encryption key with physical access may be possible.
   </li>
+  <li><h4>Keep volume open when the app goes in background:</h4>
+  Don't close the volume when you leave the app but keep running it in the background. Anyone going back to the activity could have access to the volume.
+  </li>
+  <li><h4>Allow opening files with other applications*:</h4>
+  Decrypt and open file using external apps. These apps could save and send the files thus opened.
+  </li>
+  <li><h4>Expose open volumes*:</h4>
+  Allow open volumes to be browsed in the system file explorer (<a href="https://developer.android.com/guide/topics/providers/document-provider">DocumentProvider</a> API). Encrypted files can then be selected from other applications, potentially with permanent access. This feature requires <i>"Keep volume open when the app goes in background"</i> to be enabled.
+  </li>
+  <li><h4>Grant write access:</h4>
+  Files opened with another applications can be modified by them. This applies to both previous unsafe features.
+  </li>
 </ul>
-* Features requiring temporary writing of the plain file to disk (DroidFS internal storage). This file could be read by apps with root access or by physical access if your device is not encrypted.
+
+\* These features can work in two ways: temporarily writing the plain file to disk (DroidFS internal storage) or sharing it via memory. By default, DroidFS will choose to keep the file only in memory as it's more secure, but will fallback to disk export if the file is too large to be held in memory. This behavior can be changed with the *"Export method"* parameter in the settings. Please note that some applications require the file to be stored on disk, and therefore do not work with memory-exported files.
 
 # Download
 <a href="https://f-droid.org/packages/sushi.hardcore.droidfs">
 	<img src="https://fdroid.gitlab.io/artwork/badge/get-it-on.png" height="75">
 </a>
 
-You can download DroidFS from [F-Droid](https://f-droid.org/packages/sushi.hardcore.droidfs) or from the "Releases" section in the repo. 
+You can download DroidFS from [F-Droid](https://f-droid.org/packages/sushi.hardcore.droidfs) or from the "Releases" section in this repository.
 
 APKs available here are signed with my PGP key available on keyservers:
 
@@ -65,17 +88,17 @@ __Don't install the APK if the checksums don't match!__
 F-Droid APKs should be signed with the F-Droid key. More details [here](https://f-droid.org/docs/Release_Channels_and_Signing_Keys).
 
 # Permissions
-DroidFS need some permissions to work properly. Here is why:
+DroidFS needs some permissions for certain features. However, you are free to deny them if you do not wish to use these features.
 
 <ul>
   <li><h4>Read & write access to shared storage:</h4>
-  Required for creating, opening and modifying volumes and for importing/exporting files to/from volumes.
+  Required to access volumes located on shared storage.
   </li>
   <li><h4>Biometric/Fingerprint hardware:</h4>
   Required to encrypt/decrypt password hashes using a fingerprint protected key.
   </li>
   <li><h4>Camera:</h4>
-  Needed to take photos & videos directly encrypted inside DroidFS. You can deny this permission if you don't want to use it.
+  Required to take encrypted photos or videos directly from the app.
   </li>
   <li><h4>Record audio:</h4>
   Required if you want sound on video recorded with DroidFS.
@@ -83,83 +106,24 @@ DroidFS need some permissions to work properly. Here is why:
 </ul>
 
 # Limitations
-DroidFS use some parts of the original gocryptfs code, which is designed to run on Linux x86 systems: it accesses the underlying file system with file paths and syscalls. However in Android, you can't access other apps files with file paths. Instead, you must use the [ContentProvider](https://developer.android.com/guide/topics/providers/content-providers) API. And obviously, the original gocryptfs code doesn't work with this API. This is why DroidFS can't open volumes provided by other applications, such as cloud storage clients. You can only use DroidFS with volumes located on shared storage or in the app's internal storage (hidden volumes). External storage such as SD cards are only supported in read-only access for now.
+DroidFS works as a wrapper around modified versions of the original encrypted container implementations ([libgocryptfs](https://forge.chapril.org/hardcoresushi/libgocryptfs) and [libcryfs](https://forge.chapril.org/hardcoresushi/libcryfs)). These programs were designed to run on standard x86 Linux systems: they access the underlying file system with file paths and syscalls. However, on Android, you can't access files from other applications using file paths. Instead, one has to use the [ContentProvider](https://developer.android.com/guide/topics/providers/content-providers) API. Obviously, neither Gocryptfs nor CryFS support this API. As a result, DroidFS cannot open volumes provided by other applications (such as cloud storage clients). If you want to synchronize your volumes on a cloud, the cloud application must synchronize the encrypted directory from disk.
 
-# Build
+Due to Android's storage restrictions, encrypted volumes located on SD cards must be placed under `/Android/data/sushi.hardcore.droidfs/` if you want DroidFS to be able to modify them.
-Most of the original gocryptfs code was used as is (written in Go) and compiled to native code. That's why you need [Go](https://golang.org) and the [Android Native Development Kit (NDK)](https://developer.android.com/ndk/) to build DroidFS from source.
 
-#### Install dependencies
+# Building from source
-On debian:
+You can follow the instructions in [BUILD.md](BUILD.md) to build DroidFS from source.
-```
-$ sudo apt-get install build-essential pkg-config libssl-dev
-```
-Install [Go](https://golang.org/doc/install):
-```
-$ sudo apt-get install golang-go
-```
-You also need to install the Android SDK build tools and the [Android NDK](https://developer.android.com/studio/projects/install-ndk).
-
-#### Download Sources
-```
-$ git clone --recurse-submodules https://github.com/hardcore-sushi/DroidFS.git
-$ cd DroidFS
-```
-[libgocryptfs](https://forge.chapril.org/hardcoresushi/libgocryptfs) needs OpenSSL:
-```
-$ cd app/libgocryptfs
-$ wget https://www.openssl.org/source/openssl-1.1.1n.tar.gz
-```
-Verify OpenSSL signature:
-```
-$ wget https://www.openssl.org/source/openssl-1.1.1n.tar.gz.asc
-$ gpg --verify openssl-1.1.1n.tar.gz.asc openssl-1.1.1n.tar.gz
-```
-Continue **ONLY** if the signature is **VALID**.
-```
-$ tar -xvzf openssl-1.1.1n.tar.gz
-```
-DroidFS also need [FFmpeg](https://ffmpeg.org) to record encrypted video:
-```
-$ cd app/ffmpeg
-$ git clone --depth=1 https://git.ffmpeg.org/ffmpeg.git
-```
-
-#### Generate a keystore
-APKs must be signed to be installed on an Android device. If you don't already have a keystore, you can generate one by running:
-```
-$ keytool -genkey -keystore <output file> -alias <key alias> -keyalg EC -validity 10000
-```
-
-#### Build
-Retrieve your Android NDK installation path, usually something like "/home/\<user\>/Android/SDK/ndk/\<NDK version\>". Now you can build libgocryptfs:
-```
-$ cd DroidFS/app/libgocryptfs
-$ env ANDROID_NDK_HOME="<your ndk path>" OPENSSL_PATH="./openssl-1.1.1n" ./build.sh
- ```
-Then FFmpeg:
-```
-$ cd app/ffmpeg
-$ env ANDROID_NDK_HOME="<your ndk path>" ./build.sh ffmpeg
-```
-Finally, compile the app:
-```
-$ ./gradlew assembleRelease
-```
-If the build succeeds, you will find the unsigned APKs in `app/build/outputs/apk/release/`. You need to sign them in order to install the app:
-```
-$ apksigner sign --out droidfs.apk -v --ks <keystore> app/build/outputs/apk/release/<unsigned apk file>
-```
-Now you can install `droidfs.apk` on your device.
 
 # Third party code
 Thanks to these open source projects that DroidFS uses:
 
 ### Modified code:
-- [libgocryptfs](https://forge.chapril.org/hardcoresushi/libgocryptfs) (forked from [gocryptfs](https://github.com/rfjakob/gocryptfs)) to encrypt your data
+- Encrypted filesystems (to protect your data):
+    - [libgocryptfs](https://forge.chapril.org/hardcoresushi/libgocryptfs) (forked from [gocryptfs](https://github.com/rfjakob/gocryptfs))
+    - [libcryfs](https://forge.chapril.org/hardcoresushi/libcryfs) (forked from [CryFS](https://github.com/cryfs/cryfs))
 - [libpdfviewer](https://forge.chapril.org/hardcoresushi/libpdfviewer) (forked from [PdfViewer](https://github.com/GrapheneOS/PdfViewer)) to open PDF files
 - [DoubleTapPlayerView](https://github.com/vkay94/DoubleTapPlayerView) to add double-click controls to the video player
 ### Borrowed code:
-- [MaterialFiles](https://github.com/zhanghai/MaterialFiles) for kotlin natural sorting implementation
+- [MaterialFiles](https://github.com/zhanghai/MaterialFiles) for Kotlin natural sorting implementation
 ### Libraries:
-- [Glide](https://github.com/bumptech/glide/) to display pictures
+- [Glide](https://github.com/bumptech/glide) to display pictures
 - [ExoPlayer](https://github.com/google/ExoPlayer) to play media files

TODO.md

@@ -0,0 +1,31 @@
+# TODO
+
+Here's a list of features that it would be nice to have in DroidFS. As this is a FLOSS project, there are no special requirements on *when* or even *if* these features will be implemented, but contributions are greatly appreciated.
+
+## Security
+- [hardened_malloc](https://github.com/GrapheneOS/hardened_malloc) compatibility ([#181](https://github.com/hardcore-sushi/DroidFS/issues/181))
+- Internal keyboard for passwords
+
+## UX
+- File associations editor
+- Optional discovery before file operations
+- Modifiable CryFS scrypt parameters
+- Alert dialog showing details of file operations
+- Internal file browser to select volumes
+
+## Encryption software support
+- [Shufflecake](https://shufflecake.net): plausible deniability for multiple hidden filesystems on Linux (would be absolutely awesome to have but quite difficult)
+- [fscrypt](https://www.kernel.org/doc/html/latest/filesystems/fscrypt.html): filesystem encryption at the kernel level
+
+## Health
+- F-Droid ABI split
+- OpenSSL & FFmpeg as git submodules (useful for F-Droid)
+- Remove all android:configChanges from AndroidManifest.xml
+- More efficient thumbnails cache
+- Guide for translators
+- Usage & code documentation
+- Automated tests
+
+## And:
+- All the [feature requests on the GitHub repo](https://github.com/hardcore-sushi/DroidFS/issues?q=is%3Aissue+is%3Aopen+label%3Aenhancement)
+- All the [feature requests on the Gitea repo](https://forge.chapril.org/hardcoresushi/DroidFS/issues?q=&state=open&labels=748)

app/CMakeLists.txt

@@ -1,27 +1,30 @@
 cmake_minimum_required(VERSION 3.10)
 
-add_library(
+project(DroidFS)
-        gocryptfs
-        SHARED
-        IMPORTED
-)
 
-set_target_properties(
+option(GOCRYPTFS "build libgocryptfs" ON)
-        gocryptfs
+option(CRYFS "build libcryfs" ON)
-        PROPERTIES IMPORTED_LOCATION
-        ${PROJECT_SOURCE_DIR}/libgocryptfs/build/${ANDROID_ABI}/libgocryptfs.so
-)
 
-add_library(
+add_library(memfile SHARED src/main/native/memfile.c)
-        gocryptfs_jni
+target_link_libraries(memfile log)
-        SHARED
-        src/main/native/gocryptfs_jni.c
-)
 
-target_link_libraries(
+if (GOCRYPTFS)
-        gocryptfs_jni
+	add_library(gocryptfs SHARED IMPORTED)
-        gocryptfs
+	set_target_properties(
-)
+		gocryptfs
+		PROPERTIES IMPORTED_LOCATION
+		${PROJECT_SOURCE_DIR}/libgocryptfs/build/${ANDROID_ABI}/libgocryptfs.so
+	)
+	add_library(gocryptfs_jni SHARED src/main/native/gocryptfs_jni.c)
+	target_include_directories(gocryptfs_jni PRIVATE ${PROJECT_SOURCE_DIR}/libgocryptfs/build/${ANDROID_ABI})
+	target_link_libraries(gocryptfs_jni gocryptfs)
+endif()
+
+if (CRYFS)
+	add_subdirectory(${PROJECT_SOURCE_DIR}/libcryfs)
+	add_library(cryfs_jni SHARED src/main/native/libcryfs.c)
+	target_link_libraries(cryfs_jni libcryfs-jni)
+endif()
 
 add_library(
         avformat
@@ -65,14 +68,12 @@ add_library(
         src/main/native/libmux.c
 )
 
+target_include_directories(mux PRIVATE ${PROJECT_SOURCE_DIR}/ffmpeg/build/${ANDROID_ABI})
+
 target_link_libraries(
         mux
         avformat
         avcodec
         avutil
-)
+        log
-
-include_directories(
-        ${PROJECT_SOURCE_DIR}/libgocryptfs/build/${ANDROID_ABI}
-        ${PROJECT_SOURCE_DIR}/ffmpeg/build/${ANDROID_ABI}
 )

app/build.gradle

@@ -1,50 +1,89 @@
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 
+if (hasProperty("disableCryFS")) {
+    ext.disableCryFS = getProperty("disableCryFS")
+} else {
+    ext.disableCryFS = false
+}
+
+if (hasProperty("disableGocryptfs")) {
+    ext.disableGocryptfs = getProperty("disableGocryptfs")
+} else {
+    ext.disableGocryptfs = false
+}
+
+if (hasProperty("nosplits")) {
+	ext.splits = false
+} else {
+	ext.splits = true
+}
+
 android {
-    compileSdkVersion 31
+    compileSdk 34
-    buildToolsVersion "31"
+    ndkVersion "26.1.10909125"
-    ndkVersion "23.1.7779620"
+    namespace "sushi.hardcore.droidfs"
 
     compileOptions {
-        targetCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_17
+        sourceCompatibility JavaVersion.VERSION_17
+    }
+
+    kotlinOptions {
+        jvmTarget = "17"
     }
 
     defaultConfig {
         applicationId "sushi.hardcore.droidfs"
         minSdkVersion 21
-        //noinspection ExpiredTargetSdkVersion
+        targetSdkVersion 32
-        targetSdkVersion 29
+        versionCode 36
-        versionCode 27
+        versionName "2.1.3"
-        versionName "1.10.1"
 
         ndk {
             abiFilters "x86", "x86_64", "armeabi-v7a", "arm64-v8a"
         }
+
+        externalNativeBuild.cmake {
+            if (project.ext.disableGocryptfs) {
+                arguments "-DGOCRYPTFS=OFF"
+            }
+            if (project.ext.disableCryFS) {
+                arguments "-DCRYFS=OFF"
+            }
+        }
     }
 
-    if (!file("fdroid").exists()) {
+    if (project.ext.splits) {
         splits {
             abi {
                 enable true
+                reset() // fix unknown bug (https://ru.stackoverflow.com/questions/1557805/abis-armeabi-mips-mips64-riscv64-are-not-supported-for-platform)
                 universalApk true
             }
         }
     }
 
-    applicationVariants.all { variant ->
+    applicationVariants.configureEach { variant ->
         variant.resValue "string", "versionName", variant.versionName
+        buildConfigField "boolean", "CRYFS_DISABLED", "${project.ext.disableCryFS}"
+        buildConfigField "boolean", "GOCRYPTFS_DISABLED", "${project.ext.disableGocryptfs}"
     }
 
     buildFeatures {
         viewBinding true
+        buildConfig true
     }
 
     buildTypes {
         release {
-            minifyEnabled true
+            postprocessing {
-            shrinkResources true
+                removeUnusedCode true
-            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+                removeUnusedResources true
+                obfuscate false
+                optimizeCode true
+                proguardFiles 'proguard-rules.pro'
+            }
         }
     }
 
@@ -53,32 +92,46 @@ android {
             path file('CMakeLists.txt')
         }
     }
+
+    sourceSets {
+        main {
+            java {
+                exclude 'androidx/camera/video/originals/**'
+            }
+        }
+    }
 }
 
 dependencies {
     implementation project(":libpdfviewer:app")
-    implementation fileTree(dir: "libs", include: ["*.jar"])
+    implementation 'androidx.core:core-ktx:1.12.0'
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
+    implementation "androidx.appcompat:appcompat:1.6.1"
-    implementation 'androidx.core:core-ktx:1.7.0'
+    implementation "androidx.constraintlayout:constraintlayout:2.1.4"
-    implementation "androidx.appcompat:appcompat:1.4.1"
+    def lifecycle_version = "2.6.2"
-    implementation "androidx.constraintlayout:constraintlayout:2.1.3"
+    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version"
+    implementation "androidx.lifecycle:lifecycle-process:$lifecycle_version"
 
-    implementation "androidx.sqlite:sqlite-ktx:2.2.0"
+    implementation "androidx.sqlite:sqlite-ktx:2.3.1"
-    implementation "androidx.preference:preference-ktx:1.2.0"
+    implementation "androidx.preference:preference-ktx:1.2.1"
     implementation "androidx.swiperefreshlayout:swiperefreshlayout:1.1.0"
-    implementation 'com.google.android.material:material:1.5.0'
+    implementation 'com.google.android.material:material:1.9.0'
-    implementation "com.github.bumptech.glide:glide:4.12.0"
+    implementation 'com.github.bumptech.glide:glide:4.16.0'
-    implementation "androidx.biometric:biometric-ktx:1.2.0-alpha04"
+    implementation "androidx.biometric:biometric-ktx:1.2.0-alpha05"
 
-    def exoplayer_version = "2.17.1"
+    def media3_version = "1.1.1"
-    implementation "com.google.android.exoplayer:exoplayer-core:$exoplayer_version"
+    implementation "androidx.media3:media3-exoplayer:$media3_version"
-    implementation "com.google.android.exoplayer:exoplayer-ui:$exoplayer_version"
+    implementation 'androidx.media3:media3-ui:1.1.1'
+    implementation "androidx.media3:media3-datasource:$media3_version"
 
     implementation "androidx.concurrent:concurrent-futures:1.1.0"
 
-    def camerax_version = "1.1.0-beta03"
+    def camerax_version = "1.3.0-rc02"
     implementation "androidx.camera:camera-camera2:$camerax_version"
     implementation "androidx.camera:camera-lifecycle:$camerax_version"
     implementation "androidx.camera:camera-view:$camerax_version"
     implementation "androidx.camera:camera-extensions:$camerax_version"
+
+    def autoValueVersion = '1.10.4'
+    implementation "com.google.auto.value:auto-value-annotations:$autoValueVersion"
+    annotationProcessor "com.google.auto.value:auto-value:$autoValueVersion"
 }

app/ffmpeg/build.sh

@@ -63,6 +63,7 @@ else
 			--disable-sndio \
 			--disable-schannel \
 			--disable-securetransport \
+			--disable-vulkan \
 			--disable-xlib \
 			--disable-zlib \
 			--disable-cuvid \

app/libcryfs

@@ -0,0 +1 @@
+Subproject commit 6388eaf433a4196f10389921d5e346c90ee3d793

app/libgocryptfs

@@ -1 +1 @@
-Subproject commit 9e98192442b08362660b45f4e2e50221ba7bc65b
+Subproject commit 4f32853ae5ac70811b451cac60ed36fd5b93cbc8

app/proguard-rules.pro

@@ -1,31 +1,24 @@
-# Add project specific ProGuard rules here.
+-keepattributes SourceFile,LineNumberTable
-# You can control the set of applied configuration files using the
-# proguardFiles setting in build.gradle.
-#
-# For more details, see
-#   http://developer.android.com/guide/developing/tools/proguard.html
-
-# If your project uses WebView with JS, uncomment the following
-# and specify the fully qualified class name to the JavaScript interface
-# class:
-#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
-#   public *;
-#}
-
-# Uncomment this to preserve the line number information for
-# debugging stack traces.
-#-keepattributes SourceFile,LineNumberTable
-
-# If you keep the line number information, uncomment this to
-# hide the original source file name.
-#-renamesourcefileattribute SourceFile
 
 -keep class sushi.hardcore.droidfs.SettingsActivity$**
 -keep class sushi.hardcore.droidfs.explorers.ExplorerElement
 -keepclassmembers class sushi.hardcore.droidfs.explorers.ExplorerElement {
     static sushi.hardcore.droidfs.explorers.ExplorerElement new(...);
 }
--keepclassmembers class sushi.hardcore.droidfs.video_recording.MediaMuxer {
+-keepclassmembers class sushi.hardcore.droidfs.video_recording.FFmpegMuxer {
     void writePacket(byte[]);
     void seek(long);
+}
+# Required for Intent.getParcelableExtra() to work on Android 13
+-keep class sushi.hardcore.droidfs.VolumeData {
+    public int describeContents();
+}
+-keep class sushi.hardcore.droidfs.VolumeData$* {
+    static public android.os.Parcelable$Creator CREATOR;
+}
+-keep class sushi.hardcore.droidfs.filesystems.EncryptedVolume {
+    public int describeContents();
+}
+-keep class sushi.hardcore.droidfs.filesystems.EncryptedVolume$* {
+    static public android.os.Parcelable$Creator CREATOR;
 }

app/src/main/AndroidManifest.xml

@@ -1,13 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
-    package="sushi.hardcore.droidfs"
     android:installLocation="auto">
 
-    <permission
+    <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" tools:ignore="ScopedStorage" />
-        android:name="${applicationId}.WRITE_TEMPORARY_STORAGE"
-        android:protectionLevel="signature" />
-
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.USE_BIOMETRIC" />
     <uses-permission android:name="android.permission.CAMERA" />
@@ -25,12 +21,14 @@
         tools:node="remove" /> <!--removing this permission automatically added by exoplayer-->
 
     <application
-        android:allowBackup="false"
+        android:icon="@mipmap/ic_launcher"
-        android:icon="@mipmap/icon_launcher"
         android:label="@string/app_name"
         android:requestLegacyExternalStorage="true"
         android:supportsRtl="true"
-        android:theme="@style/BaseTheme">
+        android:theme="@style/BaseTheme"
+        android:name=".VolumeManagerApp"
+        android:fullBackupContent="false"
+        android:dataExtractionRules="@xml/backup_rules">
         <activity android:name=".MainActivity" android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -49,13 +47,15 @@
         <activity android:name=".explorers.ExplorerActivity"/>
         <activity android:name=".explorers.ExplorerActivityPick"/>
         <activity android:name=".explorers.ExplorerActivityDrop"/>
-        <activity android:name=".file_viewers.ImageViewer" android:configChanges="screenSize|orientation" /> <!-- don't reload content on configuration change -->
+        <activity android:name=".file_viewers.ImageViewer"/>
         <activity android:name=".file_viewers.VideoPlayer" android:configChanges="screenSize|orientation" />
-        <activity android:name=".file_viewers.PdfViewer" android:configChanges="screenSize|orientation" />
+        <activity android:name=".file_viewers.PdfViewer" android:configChanges="screenSize|orientation" android:theme="@style/AppTheme" />
         <activity android:name=".file_viewers.AudioPlayer" android:configChanges="screenSize|orientation" />
         <activity android:name=".file_viewers.TextEditor" android:configChanges="screenSize|orientation" />
         <activity android:name=".CameraActivity" android:screenOrientation="nosensor" />
+        <activity android:name=".LogcatActivity"/>
 
+        <service android:name=".WiperService" android:exported="false" android:stopWithTask="false"/>
         <service android:name=".file_operations.FileOperationService" android:exported="false"/>
 
         <receiver android:name=".file_operations.NotificationBroadcastReceiver" android:exported="false">
@@ -65,10 +65,21 @@
         </receiver>
 
         <provider
-            android:name=".content_providers.RestrictedFileProvider"
+            android:name=".content_providers.TemporaryFileProvider"
             android:authorities="${applicationId}.temporary_provider"
+            android:exported="true"/>
+
+        <provider
+            android:authorities="${applicationId}.volume_provider"
+            android:name=".content_providers.VolumeProvider"
             android:exported="true"
-            android:writePermission="${applicationId}.WRITE_TEMPORARY_STORAGE" />
+            android:grantUriPermissions="true"
+            android:permission="android.permission.MANAGE_DOCUMENTS">
+            <intent-filter>
+                <action android:name="android.content.action.DOCUMENTS_PROVIDER" />
+            </intent-filter>
+        </provider>
+
     </application>
 
 </manifest>

app/src/main/java/androidx/camera/video/MediaMuxer.kt

@@ -0,0 +1,14 @@
+package androidx.camera.video
+
+import android.media.MediaCodec
+import android.media.MediaFormat
+import java.nio.ByteBuffer
+
+interface MediaMuxer {
+    fun setOrientationHint(degree: Int)
+    fun release()
+    fun addTrack(mediaFormat: MediaFormat): Int
+    fun start()
+    fun writeSampleData(trackIndex: Int, buffer: ByteBuffer, bufferInfo: MediaCodec.BufferInfo)
+    fun stop()
+}

app/src/main/java/androidx/camera/video/MuxerOutputOptions.kt

@@ -0,0 +1,16 @@
+package androidx.camera.video
+
+import android.location.Location
+
+class MuxerOutputOptions(private val mediaMuxer: MediaMuxer): OutputOptions(MuxerOutputOptionsInternal()) {
+
+    private class MuxerOutputOptionsInternal: OutputOptionsInternal() {
+        override fun getFileSizeLimit(): Long = FILE_SIZE_UNLIMITED.toLong()
+
+        override fun getDurationLimitMillis(): Long = DURATION_UNLIMITED.toLong()
+
+        override fun getLocation(): Location? = null
+    }
+
+    fun getMediaMuxer(): MediaMuxer = mediaMuxer
+}

app/src/main/java/androidx/camera/video/SucklessPendingRecording.java

@@ -0,0 +1,254 @@
+/*
+ * Copyright 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package androidx.camera.video;
+
+import android.Manifest;
+import android.annotation.SuppressLint;
+import android.content.Context;
+
+import androidx.annotation.CheckResult;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.RequiresApi;
+import androidx.annotation.RequiresPermission;
+import androidx.camera.core.impl.utils.ContextUtil;
+import androidx.core.content.PermissionChecker;
+import androidx.core.util.Consumer;
+import androidx.core.util.Preconditions;
+
+import java.util.concurrent.Executor;
+
+/**
+ * A recording that can be started at a future time.
+ *
+ * <p>A pending recording allows for configuration of a recording before it is started. Once a
+ * pending recording is started with {@link #start(Executor, Consumer)}, any changes to the pending
+ * recording will not affect the actual recording; any modifications to the recording will need
+ * to occur through the controls of the {@link SucklessRecording} class returned by
+ * {@link #start(Executor, Consumer)}.
+ *
+ * <p>A pending recording can be created using one of the {@link Recorder} methods for starting a
+ * recording such as {@link Recorder#prepareRecording(Context, MediaStoreOutputOptions)}.
+
+ * <p>There may be more settings that can only be changed per-recorder instead of per-recording,
+ * because it requires expensive operations like reconfiguring the camera. For those settings, use
+ * the {@link Recorder.Builder} methods to configure before creating the {@link Recorder}
+ * instance, then create the pending recording with it.
+ */
+@RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java
+@SuppressLint("RestrictedApi")
+public final class SucklessPendingRecording {
+
+    private final Context mContext;
+    private final SucklessRecorder mRecorder;
+    private final OutputOptions mOutputOptions;
+    private Consumer<VideoRecordEvent> mEventListener;
+    private Executor mListenerExecutor;
+    private boolean mAudioEnabled = false;
+    private boolean mIsPersistent = false;
+
+    SucklessPendingRecording(@NonNull Context context, @NonNull SucklessRecorder recorder,
+            @NonNull OutputOptions options) {
+        // Application context is sufficient for all our needs, so store that to avoid leaking
+        // unused resources. For attribution, ContextUtil.getApplicationContext() will retain the
+        // attribution tag from the original context.
+        mContext = ContextUtil.getApplicationContext(context);
+        mRecorder = recorder;
+        mOutputOptions = options;
+    }
+
+    /**
+     * Returns an application context which was retrieved from the {@link Context} used to
+     * create this object.
+     */
+    @NonNull
+    Context getApplicationContext() {
+        return mContext;
+    }
+
+    @NonNull
+    SucklessRecorder getRecorder() {
+        return mRecorder;
+    }
+
+    @NonNull
+    OutputOptions getOutputOptions() {
+        return mOutputOptions;
+    }
+
+    @Nullable
+    Executor getListenerExecutor() {
+        return mListenerExecutor;
+    }
+
+    @Nullable
+    Consumer<VideoRecordEvent> getEventListener() {
+        return mEventListener;
+    }
+
+    boolean isAudioEnabled() {
+        return mAudioEnabled;
+    }
+
+    boolean isPersistent() {
+        return mIsPersistent;
+    }
+
+    /**
+     * Enables audio to be recorded for this recording.
+     *
+     * <p>This method must be called prior to {@link #start(Executor, Consumer)} to enable audio
+     * in the recording. If this method is not called, the {@link SucklessRecording} generated by
+     * {@link #start(Executor, Consumer)} will not contain audio, and
+     * {@link AudioStats#getAudioState()} will always return
+     * {@link AudioStats#AUDIO_STATE_DISABLED} for all {@link RecordingStats} send to the listener
+     * set passed to {@link #start(Executor, Consumer)}.
+     *
+     * <p>Recording with audio requires the {@link android.Manifest.permission#RECORD_AUDIO}
+     * permission; without it, recording will fail at {@link #start(Executor, Consumer)} with an
+     * {@link IllegalStateException}.
+     *
+     * @return this pending recording
+     * @throws IllegalStateException if the {@link Recorder} this recording is associated to
+     * doesn't support audio.
+     * @throws SecurityException if the {@link Manifest.permission#RECORD_AUDIO} permission
+     * is denied for the current application.
+     */
+    @RequiresPermission(Manifest.permission.RECORD_AUDIO)
+    @NonNull
+    public SucklessPendingRecording withAudioEnabled() {
+        // Check permissions and throw a security exception if RECORD_AUDIO is not granted.
+        if (PermissionChecker.checkSelfPermission(mContext, Manifest.permission.RECORD_AUDIO)
+                == PermissionChecker.PERMISSION_DENIED) {
+            throw new SecurityException("Attempted to enable audio for recording but application "
+                    + "does not have RECORD_AUDIO permission granted.");
+        }
+        Preconditions.checkState(mRecorder.isAudioSupported(), "The Recorder this recording is "
+                + "associated to doesn't support audio.");
+        mAudioEnabled = true;
+        return this;
+    }
+
+    /**
+     * Configures the recording to be a persistent recording.
+     *
+     * <p>A persistent recording will only be stopped by explicitly calling
+     * {@link Recording#stop()} or {@link Recording#close()} and will ignore events that would
+     * normally cause recording to stop, such as lifecycle events or explicit unbinding of a
+     * {@link VideoCapture} use case that the recording's {@link Recorder} is attached to.
+     *
+     * <p>Even though lifecycle events or explicit unbinding use cases won't stop a persistent
+     * recording, it will still stop the camera from producing data, resulting in the in-progress
+     * persistent recording stopping getting data until the camera stream is activated again. For
+     * example, when the activity goes into background, the recording will keep waiting for new
+     * data to be recorded until the activity is back to foreground.
+     *
+     * <p>A {@link Recorder} instance is recommended to be associated with a single
+     * {@link VideoCapture} instance, especially when using persistent recording. Otherwise, there
+     * might be unexpected behavior. Any in-progress persistent recording created from the same
+     * {@link Recorder} should be stopped before starting a new recording, even if the
+     * {@link Recorder} is associated with a different {@link VideoCapture}.
+     *
+     * <p>To switch to a different camera stream while a recording is in progress, first create
+     * the recording as persistent recording, then rebind the {@link VideoCapture} it's
+     * associated with to a different camera. The implementation may be like:
+     * <pre>{@code
+     * // Prepare the Recorder and VideoCapture, then bind the VideoCapture to the back camera.
+     * Recorder recorder = Recorder.Builder().build();
+     * VideoCapture videoCapture = VideoCapture.withOutput(recorder);
+     * cameraProvider.bindToLifecycle(
+     *         lifecycleOwner, CameraSelector.DEFAULT_BACK_CAMERA, videoCapture);
+     *
+     * // Prepare the persistent recording and start it.
+     * Recording recording = recorder
+     *         .prepareRecording(context, outputOptions)
+     *         .asPersistentRecording()
+     *         .start(eventExecutor, eventListener);
+     *
+     * // Record from the back camera for a period of time.
+     *
+     * // Rebind the VideoCapture to the front camera.
+     * cameraProvider.unbindAll();
+     * cameraProvider.bindToLifecycle(
+     *         lifecycleOwner, CameraSelector.DEFAULT_FRONT_CAMERA, videoCapture);
+     *
+     * // Record from the front camera for a period of time.
+     *
+     * // Stop the recording explicitly.
+     * recording.stop();
+     * }</pre>
+     *
+     * <p>The audio data will still be recorded after the {@link VideoCapture} is unbound.
+     * {@link Recording#pause() Pause} the recording first and {@link Recording#resume() resume} it
+     * later to stop recording audio while rebinding use cases.
+     *
+     * <p>If the recording is unable to receive data from the new camera, possibly because of
+     * incompatible surface combination, an exception will be thrown when binding to lifecycle.
+     */
+    @ExperimentalPersistentRecording
+    @NonNull
+    public SucklessPendingRecording asPersistentRecording() {
+        mIsPersistent = true;
+        return this;
+    }
+
+    /**
+     * Starts the recording, making it an active recording.
+     *
+     * <p>Only a single recording can be active at a time, so if another recording is active,
+     * this will throw an {@link IllegalStateException}.
+     *
+     * <p>If there are no errors starting the recording, the returned {@link SucklessRecording}
+     * can be used to {@link SucklessRecording#pause() pause}, {@link SucklessRecording#resume() resume},
+     * or {@link SucklessRecording#stop() stop} the recording.
+     *
+     * <p>Upon successfully starting the recording, a {@link VideoRecordEvent.Start} event will
+     * be the first event sent to the provided event listener.
+     *
+     * <p>If errors occur while starting the recording, a {@link VideoRecordEvent.Finalize} event
+     * will be the first event sent to the provided listener, and information about the error can
+     * be found in that event's {@link VideoRecordEvent.Finalize#getError()} method. The returned
+     * {@link SucklessRecording} will be in a finalized state, and all controls will be no-ops.
+     *
+     * <p>If the returned {@link SucklessRecording} is garbage collected, the recording will be
+     * automatically stopped. A reference to the active recording must be maintained as long as
+     * the recording needs to be active. If the recording is garbage collected, the
+     * {@link VideoRecordEvent.Finalize} event will contain error
+     * {@link VideoRecordEvent.Finalize#ERROR_RECORDING_GARBAGE_COLLECTED}.
+     *
+     * <p>The {@link Recording} will be stopped automatically if the {@link VideoCapture} its
+     * {@link Recorder} is attached to is unbound unless it's created
+     * {@link #asPersistentRecording() as a persistent recording}.
+     *
+     * @throws IllegalStateException if the associated Recorder currently has an unfinished
+     * active recording.
+     * @param listenerExecutor the executor that the event listener will be run on.
+     * @param listener the event listener to handle video record events.
+     */
+    @NonNull
+    @CheckResult
+    public SucklessRecording start(
+            @NonNull Executor listenerExecutor,
+            @NonNull Consumer<VideoRecordEvent> listener) {
+        Preconditions.checkNotNull(listenerExecutor, "Listener Executor can't be null.");
+        Preconditions.checkNotNull(listener, "Event listener can't be null");
+        mListenerExecutor = listenerExecutor;
+        mEventListener = listener;
+        return mRecorder.start(this);
+    }
+}
+

app/src/main/java/androidx/camera/video/SucklessRecording.java

@@ -0,0 +1,263 @@
+/*
+ * Copyright 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package androidx.camera.video;
+
+import static androidx.annotation.RestrictTo.Scope.LIBRARY_GROUP;
+
+import android.annotation.SuppressLint;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.RequiresApi;
+import androidx.annotation.RestrictTo;
+import androidx.camera.core.impl.utils.CloseGuardHelper;
+import androidx.core.util.Consumer;
+import androidx.core.util.Preconditions;
+
+import java.util.concurrent.Executor;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/**
+ * Provides controls for the currently active recording.
+ *
+ * <p>An active recording is created by starting a pending recording with
+ * {@link PendingRecording#start(Executor, Consumer)}. If there are no errors starting the
+ * recording, upon creation, an active recording will provide controls to pause, resume or stop a
+ * recording. If errors occur while starting the recording, the active recording will be
+ * instantiated in a {@link VideoRecordEvent.Finalize finalized} state, and all controls will be
+ * no-ops. The state of the recording can be observed by the video record event listener provided
+ * to {@link PendingRecording#start(Executor, Consumer)} when starting the recording.
+ *
+ * <p>Either {@link #stop()} or {@link #close()} can be called when it is desired to
+ * stop the recording. If {@link #stop()} or {@link #close()} are not called on this object
+ * before it is no longer referenced, it will be automatically stopped at a future point in time
+ * when the object is garbage collected, and no new recordings can be started from the same
+ * {@link Recorder} that generated the object until that occurs.
+ */
+@RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java
+@SuppressLint("RestrictedApi")
+public final class SucklessRecording implements AutoCloseable {
+
+    // Indicates the recording has been explicitly stopped by users.
+    private final AtomicBoolean mIsClosed = new AtomicBoolean(false);
+    private final SucklessRecorder mRecorder;
+    private final long mRecordingId;
+    private final OutputOptions mOutputOptions;
+    private final boolean mIsPersistent;
+    private final CloseGuardHelper mCloseGuard = CloseGuardHelper.create();
+
+    SucklessRecording(@NonNull SucklessRecorder recorder, long recordingId, @NonNull OutputOptions options,
+            boolean isPersistent, boolean finalizedOnCreation) {
+        mRecorder = recorder;
+        mRecordingId = recordingId;
+        mOutputOptions = options;
+        mIsPersistent = isPersistent;
+
+        if (finalizedOnCreation) {
+            mIsClosed.set(true);
+        } else {
+            mCloseGuard.open("stop");
+        }
+    }
+
+    /**
+     * Creates an {@link SucklessRecording} from a {@link PendingRecording} and recording ID.
+     *
+     * <p>The recording ID is expected to be unique to the recorder that generated the pending
+     * recording.
+     */
+    @NonNull
+    static SucklessRecording from(@NonNull SucklessPendingRecording pendingRecording, long recordingId) {
+        Preconditions.checkNotNull(pendingRecording, "The given PendingRecording cannot be null.");
+        return new SucklessRecording(pendingRecording.getRecorder(),
+                recordingId,
+                pendingRecording.getOutputOptions(),
+                pendingRecording.isPersistent(),
+                /*finalizedOnCreation=*/false);
+    }
+
+    /**
+     * Creates an {@link SucklessRecording} from a {@link PendingRecording} and recording ID in a
+     * finalized state.
+     *
+     * <p>This can be used if there was an error setting up the active recording and it would not
+     * be able to be started.
+     *
+     * <p>The recording ID is expected to be unique to the recorder that generated the pending
+     * recording.
+     */
+    @NonNull
+    static SucklessRecording createFinalizedFrom(@NonNull SucklessPendingRecording pendingRecording,
+                                                 long recordingId) {
+        Preconditions.checkNotNull(pendingRecording, "The given PendingRecording cannot be null.");
+        return new SucklessRecording(pendingRecording.getRecorder(),
+                recordingId,
+                pendingRecording.getOutputOptions(),
+                pendingRecording.isPersistent(),
+                /*finalizedOnCreation=*/true);
+    }
+
+    @NonNull
+    OutputOptions getOutputOptions() {
+        return mOutputOptions;
+    }
+
+    /**
+     * Returns whether this recording is a persistent recording.
+     *
+     * <p>A persistent recording will only be stopped by explicitly calling of
+     * {@link Recording#stop()} and will ignore the lifecycle events or source state changes.
+     * Users are responsible of stopping a persistent recording.
+     *
+     * @return {@code true} if the recording is a persistent recording, otherwise {@code false}.
+     */
+    @ExperimentalPersistentRecording
+    public boolean isPersistent() {
+        return mIsPersistent;
+    }
+
+    /**
+     * Pauses the current recording if active.
+     *
+     * <p>Successful pausing of a recording will generate a {@link VideoRecordEvent.Pause} event
+     * which will be sent to the listener passed to
+     * {@link PendingRecording#start(Executor, Consumer)}.
+     *
+     * <p>If the recording has already been paused or has been finalized internally, this is a
+     * no-op.
+     *
+     * @throws IllegalStateException if the recording has been stopped with
+     * {@link #close()} or {@link #stop()}.
+     */
+    public void pause() {
+        if (mIsClosed.get()) {
+            throw new IllegalStateException("The recording has been stopped.");
+        }
+        mRecorder.pause(this);
+    }
+
+    /**
+     * Resumes the current recording if paused.
+     *
+     * <p>Successful resuming of a recording will generate a {@link VideoRecordEvent.Resume} event
+     * which will be sent to the listener passed to
+     * {@link PendingRecording#start(Executor, Consumer)}.
+     *
+     * <p>If the recording is active or has been finalized internally, this is a no-op.
+     *
+     * @throws IllegalStateException if the recording has been stopped with
+     * {@link #close()} or {@link #stop()}.
+     */
+    public void resume() {
+        if (mIsClosed.get()) {
+            throw new IllegalStateException("The recording has been stopped.");
+        }
+        mRecorder.resume(this);
+    }
+
+    /**
+     * Stops the recording, as if calling {@link #close()}.
+     *
+     * <p>This method is equivalent to calling {@link #close()}.
+     */
+    public void stop() {
+        close();
+    }
+
+    /**
+     * Mutes or un-mutes the current recording.
+     *
+     * <p>The output file will contain an audio track even the whole recording is muted. Create a
+     * recording without calling {@link PendingRecording#withAudioEnabled()} to record a file
+     * with no audio track.
+     *
+     * <p>Muting or unmuting a recording that isn't created
+     * {@link PendingRecording#withAudioEnabled()} with audio enabled is no-op.
+     *
+     * @param muted mutes the recording if {@code true}, un-mutes otherwise.
+     */
+    public void mute(boolean muted) {
+        if (mIsClosed.get()) {
+            throw new IllegalStateException("The recording has been stopped.");
+        }
+        mRecorder.mute(this, muted);
+    }
+
+    /**
+     * Close this recording.
+     *
+     * <p>Once {@link #stop()} or {@code close()} called, all methods for controlling the state of
+     * this recording besides {@link #stop()} or {@code close()} will throw an
+     * {@link IllegalStateException}.
+     *
+     * <p>Once an active recording has been closed, the next recording can be started with
+     * {@link PendingRecording#start(Executor, Consumer)}.
+     *
+     * <p>This method is idempotent; if the recording has already been closed or has been
+     * finalized internally, calling {@link #stop()} or {@code close()} is a no-op.
+     *
+     * <p>This method is invoked automatically on active recording instances managed by the {@code
+     * try-with-resources} statement.
+     */
+    @Override
+    public void close() {
+        stopWithError(VideoRecordEvent.Finalize.ERROR_NONE, /*errorCause=*/ null);
+    }
+
+    @Override
+    @SuppressWarnings("GenericException") // super.finalize() throws Throwable
+    protected void finalize() throws Throwable {
+        try {
+            mCloseGuard.warnIfOpen();
+            stopWithError(VideoRecordEvent.Finalize.ERROR_RECORDING_GARBAGE_COLLECTED,
+                    new RuntimeException("Recording stopped due to being garbage collected."));
+        } finally {
+            super.finalize();
+        }
+    }
+
+    /** Returns the recording ID which is unique to the recorder that generated this recording. */
+    long getRecordingId() {
+        return mRecordingId;
+    }
+
+    /**
+     * Returns whether the recording is closed.
+     *
+     * <p>The returned value does not reflect the state of the recording; it only reflects
+     * whether {@link #stop()} or {@link #close()} was called on this object.
+     *
+     * <p>The state of the recording should be checked from the listener passed to
+     * {@link PendingRecording#start(Executor, Consumer)}. Once the active recording is
+     * stopped, a {@link VideoRecordEvent.Finalize} event will be sent to the listener.
+     *
+     */
+    @RestrictTo(LIBRARY_GROUP)
+    public boolean isClosed() {
+        return mIsClosed.get();
+    }
+
+    private void stopWithError(@VideoRecordEvent.Finalize.VideoRecordError int error,
+            @Nullable Throwable errorCause) {
+        mCloseGuard.close();
+        if (mIsClosed.getAndSet(true)) {
+            return;
+        }
+        mRecorder.stop(this, error, errorCause);
+    }
+}
+

app/src/main/java/androidx/camera/video/originals/README.md

@@ -0,0 +1,20 @@
+# Update the modified CameraX files to a new upstream version:
+
+Create the `new` folder if needed:
+```
+mkdir -p new
+```
+
+Put new CameraX files from upstream in the `new` folder.
+
+Perform the 3 way merge:
+```
+./merge.sh
+```
+
+If new files are created in the current directory, they contains conflicts. Resolve them then move them to the right location.
+
+Finally, update the base:
+```
+./update.sh
+```

app/src/main/java/androidx/camera/video/originals/base/PendingRecording.java

@@ -0,0 +1,252 @@
+/*
+ * Copyright 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package androidx.camera.video;
+
+import android.Manifest;
+import android.content.Context;
+
+import androidx.annotation.CheckResult;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.RequiresApi;
+import androidx.annotation.RequiresPermission;
+import androidx.camera.core.impl.utils.ContextUtil;
+import androidx.core.content.PermissionChecker;
+import androidx.core.util.Consumer;
+import androidx.core.util.Preconditions;
+
+import java.util.concurrent.Executor;
+
+/**
+ * A recording that can be started at a future time.
+ *
+ * <p>A pending recording allows for configuration of a recording before it is started. Once a
+ * pending recording is started with {@link #start(Executor, Consumer)}, any changes to the pending
+ * recording will not affect the actual recording; any modifications to the recording will need
+ * to occur through the controls of the {@link Recording} class returned by
+ * {@link #start(Executor, Consumer)}.
+ *
+ * <p>A pending recording can be created using one of the {@link Recorder} methods for starting a
+ * recording such as {@link Recorder#prepareRecording(Context, MediaStoreOutputOptions)}.
+
+ * <p>There may be more settings that can only be changed per-recorder instead of per-recording,
+ * because it requires expensive operations like reconfiguring the camera. For those settings, use
+ * the {@link Recorder.Builder} methods to configure before creating the {@link Recorder}
+ * instance, then create the pending recording with it.
+ */
+@RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java
+public final class PendingRecording {
+
+    private final Context mContext;
+    private final Recorder mRecorder;
+    private final OutputOptions mOutputOptions;
+    private Consumer<VideoRecordEvent> mEventListener;
+    private Executor mListenerExecutor;
+    private boolean mAudioEnabled = false;
+    private boolean mIsPersistent = false;
+
+    PendingRecording(@NonNull Context context, @NonNull Recorder recorder,
+            @NonNull OutputOptions options) {
+        // Application context is sufficient for all our needs, so store that to avoid leaking
+        // unused resources. For attribution, ContextUtil.getApplicationContext() will retain the
+        // attribution tag from the original context.
+        mContext = ContextUtil.getApplicationContext(context);
+        mRecorder = recorder;
+        mOutputOptions = options;
+    }
+
+    /**
+     * Returns an application context which was retrieved from the {@link Context} used to
+     * create this object.
+     */
+    @NonNull
+    Context getApplicationContext() {
+        return mContext;
+    }
+
+    @NonNull
+    Recorder getRecorder() {
+        return mRecorder;
+    }
+
+    @NonNull
+    OutputOptions getOutputOptions() {
+        return mOutputOptions;
+    }
+
+    @Nullable
+    Executor getListenerExecutor() {
+        return mListenerExecutor;
+    }
+
+    @Nullable
+    Consumer<VideoRecordEvent> getEventListener() {
+        return mEventListener;
+    }
+
+    boolean isAudioEnabled() {
+        return mAudioEnabled;
+    }
+
+    boolean isPersistent() {
+        return mIsPersistent;
+    }
+
+    /**
+     * Enables audio to be recorded for this recording.
+     *
+     * <p>This method must be called prior to {@link #start(Executor, Consumer)} to enable audio
+     * in the recording. If this method is not called, the {@link Recording} generated by
+     * {@link #start(Executor, Consumer)} will not contain audio, and
+     * {@link AudioStats#getAudioState()} will always return
+     * {@link AudioStats#AUDIO_STATE_DISABLED} for all {@link RecordingStats} send to the listener
+     * set passed to {@link #start(Executor, Consumer)}.
+     *
+     * <p>Recording with audio requires the {@link android.Manifest.permission#RECORD_AUDIO}
+     * permission; without it, recording will fail at {@link #start(Executor, Consumer)} with an
+     * {@link IllegalStateException}.
+     *
+     * @return this pending recording
+     * @throws IllegalStateException if the {@link Recorder} this recording is associated to
+     * doesn't support audio.
+     * @throws SecurityException if the {@link Manifest.permission#RECORD_AUDIO} permission
+     * is denied for the current application.
+     */
+    @RequiresPermission(Manifest.permission.RECORD_AUDIO)
+    @NonNull
+    public PendingRecording withAudioEnabled() {
+        // Check permissions and throw a security exception if RECORD_AUDIO is not granted.
+        if (PermissionChecker.checkSelfPermission(mContext, Manifest.permission.RECORD_AUDIO)
+                == PermissionChecker.PERMISSION_DENIED) {
+            throw new SecurityException("Attempted to enable audio for recording but application "
+                    + "does not have RECORD_AUDIO permission granted.");
+        }
+        Preconditions.checkState(mRecorder.isAudioSupported(), "The Recorder this recording is "
+                + "associated to doesn't support audio.");
+        mAudioEnabled = true;
+        return this;
+    }
+
+    /**
+     * Configures the recording to be a persistent recording.
+     *
+     * <p>A persistent recording will only be stopped by explicitly calling
+     * {@link Recording#stop()} or {@link Recording#close()} and will ignore events that would
+     * normally cause recording to stop, such as lifecycle events or explicit unbinding of a
+     * {@link VideoCapture} use case that the recording's {@link Recorder} is attached to.
+     *
+     * <p>Even though lifecycle events or explicit unbinding use cases won't stop a persistent
+     * recording, it will still stop the camera from producing data, resulting in the in-progress
+     * persistent recording stopping getting data until the camera stream is activated again. For
+     * example, when the activity goes into background, the recording will keep waiting for new
+     * data to be recorded until the activity is back to foreground.
+     *
+     * <p>A {@link Recorder} instance is recommended to be associated with a single
+     * {@link VideoCapture} instance, especially when using persistent recording. Otherwise, there
+     * might be unexpected behavior. Any in-progress persistent recording created from the same
+     * {@link Recorder} should be stopped before starting a new recording, even if the
+     * {@link Recorder} is associated with a different {@link VideoCapture}.
+     *
+     * <p>To switch to a different camera stream while a recording is in progress, first create
+     * the recording as persistent recording, then rebind the {@link VideoCapture} it's
+     * associated with to a different camera. The implementation may be like:
+     * <pre>{@code
+     * // Prepare the Recorder and VideoCapture, then bind the VideoCapture to the back camera.
+     * Recorder recorder = Recorder.Builder().build();
+     * VideoCapture videoCapture = VideoCapture.withOutput(recorder);
+     * cameraProvider.bindToLifecycle(
+     *         lifecycleOwner, CameraSelector.DEFAULT_BACK_CAMERA, videoCapture);
+     *
+     * // Prepare the persistent recording and start it.
+     * Recording recording = recorder
+     *         .prepareRecording(context, outputOptions)
+     *         .asPersistentRecording()
+     *         .start(eventExecutor, eventListener);
+     *
+     * // Record from the back camera for a period of time.
+     *
+     * // Rebind the VideoCapture to the front camera.
+     * cameraProvider.unbindAll();
+     * cameraProvider.bindToLifecycle(
+     *         lifecycleOwner, CameraSelector.DEFAULT_FRONT_CAMERA, videoCapture);
+     *
+     * // Record from the front camera for a period of time.
+     *
+     * // Stop the recording explicitly.
+     * recording.stop();
+     * }</pre>
+     *
+     * <p>The audio data will still be recorded after the {@link VideoCapture} is unbound.
+     * {@link Recording#pause() Pause} the recording first and {@link Recording#resume() resume} it
+     * later to stop recording audio while rebinding use cases.
+     *
+     * <p>If the recording is unable to receive data from the new camera, possibly because of
+     * incompatible surface combination, an exception will be thrown when binding to lifecycle.
+     */
+    @ExperimentalPersistentRecording
+    @NonNull
+    public PendingRecording asPersistentRecording() {
+        mIsPersistent = true;
+        return this;
+    }
+
+    /**
+     * Starts the recording, making it an active recording.
+     *
+     * <p>Only a single recording can be active at a time, so if another recording is active,
+     * this will throw an {@link IllegalStateException}.
+     *
+     * <p>If there are no errors starting the recording, the returned {@link Recording}
+     * can be used to {@link Recording#pause() pause}, {@link Recording#resume() resume},
+     * or {@link Recording#stop() stop} the recording.
+     *
+     * <p>Upon successfully starting the recording, a {@link VideoRecordEvent.Start} event will
+     * be the first event sent to the provided event listener.
+     *
+     * <p>If errors occur while starting the recording, a {@link VideoRecordEvent.Finalize} event
+     * will be the first event sent to the provided listener, and information about the error can
+     * be found in that event's {@link VideoRecordEvent.Finalize#getError()} method. The returned
+     * {@link Recording} will be in a finalized state, and all controls will be no-ops.
+     *
+     * <p>If the returned {@link Recording} is garbage collected, the recording will be
+     * automatically stopped. A reference to the active recording must be maintained as long as
+     * the recording needs to be active. If the recording is garbage collected, the
+     * {@link VideoRecordEvent.Finalize} event will contain error
+     * {@link VideoRecordEvent.Finalize#ERROR_RECORDING_GARBAGE_COLLECTED}.
+     *
+     * <p>The {@link Recording} will be stopped automatically if the {@link VideoCapture} its
+     * {@link Recorder} is attached to is unbound unless it's created
+     * {@link #asPersistentRecording() as a persistent recording}.
+     *
+     * @throws IllegalStateException if the associated Recorder currently has an unfinished
+     * active recording.
+     * @param listenerExecutor the executor that the event listener will be run on.
+     * @param listener the event listener to handle video record events.
+     */
+    @NonNull
+    @CheckResult
+    public Recording start(
+            @NonNull Executor listenerExecutor,
+            @NonNull Consumer<VideoRecordEvent> listener) {
+        Preconditions.checkNotNull(listenerExecutor, "Listener Executor can't be null.");
+        Preconditions.checkNotNull(listener, "Event listener can't be null");
+        mListenerExecutor = listenerExecutor;
+        mEventListener = listener;
+        return mRecorder.start(this);
+    }
+}
+

app/src/main/java/androidx/camera/video/originals/base/Recording.java

@@ -0,0 +1,260 @@
+/*
+ * Copyright 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package androidx.camera.video;
+
+import static androidx.annotation.RestrictTo.Scope.LIBRARY_GROUP;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.RequiresApi;
+import androidx.annotation.RestrictTo;
+import androidx.camera.core.impl.utils.CloseGuardHelper;
+import androidx.core.util.Consumer;
+import androidx.core.util.Preconditions;
+
+import java.util.concurrent.Executor;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/**
+ * Provides controls for the currently active recording.
+ *
+ * <p>An active recording is created by starting a pending recording with
+ * {@link PendingRecording#start(Executor, Consumer)}. If there are no errors starting the
+ * recording, upon creation, an active recording will provide controls to pause, resume or stop a
+ * recording. If errors occur while starting the recording, the active recording will be
+ * instantiated in a {@link VideoRecordEvent.Finalize finalized} state, and all controls will be
+ * no-ops. The state of the recording can be observed by the video record event listener provided
+ * to {@link PendingRecording#start(Executor, Consumer)} when starting the recording.
+ *
+ * <p>Either {@link #stop()} or {@link #close()} can be called when it is desired to
+ * stop the recording. If {@link #stop()} or {@link #close()} are not called on this object
+ * before it is no longer referenced, it will be automatically stopped at a future point in time
+ * when the object is garbage collected, and no new recordings can be started from the same
+ * {@link Recorder} that generated the object until that occurs.
+ */
+@RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java
+public final class Recording implements AutoCloseable {
+
+    // Indicates the recording has been explicitly stopped by users.
+    private final AtomicBoolean mIsClosed = new AtomicBoolean(false);
+    private final Recorder mRecorder;
+    private final long mRecordingId;
+    private final OutputOptions mOutputOptions;
+    private final boolean mIsPersistent;
+    private final CloseGuardHelper mCloseGuard = CloseGuardHelper.create();
+
+    Recording(@NonNull Recorder recorder, long recordingId, @NonNull OutputOptions options,
+            boolean isPersistent, boolean finalizedOnCreation) {
+        mRecorder = recorder;
+        mRecordingId = recordingId;
+        mOutputOptions = options;
+        mIsPersistent = isPersistent;
+
+        if (finalizedOnCreation) {
+            mIsClosed.set(true);
+        } else {
+            mCloseGuard.open("stop");
+        }
+    }
+
+    /**
+     * Creates an {@link Recording} from a {@link PendingRecording} and recording ID.
+     *
+     * <p>The recording ID is expected to be unique to the recorder that generated the pending
+     * recording.
+     */
+    @NonNull
+    static Recording from(@NonNull PendingRecording pendingRecording, long recordingId) {
+        Preconditions.checkNotNull(pendingRecording, "The given PendingRecording cannot be null.");
+        return new Recording(pendingRecording.getRecorder(),
+                recordingId,
+                pendingRecording.getOutputOptions(),
+                pendingRecording.isPersistent(),
+                /*finalizedOnCreation=*/false);
+    }
+
+    /**
+     * Creates an {@link Recording} from a {@link PendingRecording} and recording ID in a
+     * finalized state.
+     *
+     * <p>This can be used if there was an error setting up the active recording and it would not
+     * be able to be started.
+     *
+     * <p>The recording ID is expected to be unique to the recorder that generated the pending
+     * recording.
+     */
+    @NonNull
+    static Recording createFinalizedFrom(@NonNull PendingRecording pendingRecording,
+            long recordingId) {
+        Preconditions.checkNotNull(pendingRecording, "The given PendingRecording cannot be null.");
+        return new Recording(pendingRecording.getRecorder(),
+                recordingId,
+                pendingRecording.getOutputOptions(),
+                pendingRecording.isPersistent(),
+                /*finalizedOnCreation=*/true);
+    }
+
+    @NonNull
+    OutputOptions getOutputOptions() {
+        return mOutputOptions;
+    }
+
+    /**
+     * Returns whether this recording is a persistent recording.
+     *
+     * <p>A persistent recording will only be stopped by explicitly calling of
+     * {@link Recording#stop()} and will ignore the lifecycle events or source state changes.
+     * Users are responsible of stopping a persistent recording.
+     *
+     * @return {@code true} if the recording is a persistent recording, otherwise {@code false}.
+     */
+    @ExperimentalPersistentRecording
+    public boolean isPersistent() {
+        return mIsPersistent;
+    }
+
+    /**
+     * Pauses the current recording if active.
+     *
+     * <p>Successful pausing of a recording will generate a {@link VideoRecordEvent.Pause} event
+     * which will be sent to the listener passed to
+     * {@link PendingRecording#start(Executor, Consumer)}.
+     *
+     * <p>If the recording has already been paused or has been finalized internally, this is a
+     * no-op.
+     *
+     * @throws IllegalStateException if the recording has been stopped with
+     * {@link #close()} or {@link #stop()}.
+     */
+    public void pause() {
+        if (mIsClosed.get()) {
+            throw new IllegalStateException("The recording has been stopped.");
+        }
+        mRecorder.pause(this);
+    }
+
+    /**
+     * Resumes the current recording if paused.
+     *
+     * <p>Successful resuming of a recording will generate a {@link VideoRecordEvent.Resume} event
+     * which will be sent to the listener passed to
+     * {@link PendingRecording#start(Executor, Consumer)}.
+     *
+     * <p>If the recording is active or has been finalized internally, this is a no-op.
+     *
+     * @throws IllegalStateException if the recording has been stopped with
+     * {@link #close()} or {@link #stop()}.
+     */
+    public void resume() {
+        if (mIsClosed.get()) {
+            throw new IllegalStateException("The recording has been stopped.");
+        }
+        mRecorder.resume(this);
+    }
+
+    /**
+     * Stops the recording, as if calling {@link #close()}.
+     *
+     * <p>This method is equivalent to calling {@link #close()}.
+     */
+    public void stop() {
+        close();
+    }
+
+    /**
+     * Mutes or un-mutes the current recording.
+     *
+     * <p>The output file will contain an audio track even the whole recording is muted. Create a
+     * recording without calling {@link PendingRecording#withAudioEnabled()} to record a file
+     * with no audio track.
+     *
+     * <p>Muting or unmuting a recording that isn't created
+     * {@link PendingRecording#withAudioEnabled()} with audio enabled is no-op.
+     *
+     * @param muted mutes the recording if {@code true}, un-mutes otherwise.
+     */
+    public void mute(boolean muted) {
+        if (mIsClosed.get()) {
+            throw new IllegalStateException("The recording has been stopped.");
+        }
+        mRecorder.mute(this, muted);
+    }
+
+    /**
+     * Close this recording.
+     *
+     * <p>Once {@link #stop()} or {@code close()} called, all methods for controlling the state of
+     * this recording besides {@link #stop()} or {@code close()} will throw an
+     * {@link IllegalStateException}.
+     *
+     * <p>Once an active recording has been closed, the next recording can be started with
+     * {@link PendingRecording#start(Executor, Consumer)}.
+     *
+     * <p>This method is idempotent; if the recording has already been closed or has been
+     * finalized internally, calling {@link #stop()} or {@code close()} is a no-op.
+     *
+     * <p>This method is invoked automatically on active recording instances managed by the {@code
+     * try-with-resources} statement.
+     */
+    @Override
+    public void close() {
+        stopWithError(VideoRecordEvent.Finalize.ERROR_NONE, /*errorCause=*/ null);
+    }
+
+    @Override
+    @SuppressWarnings("GenericException") // super.finalize() throws Throwable
+    protected void finalize() throws Throwable {
+        try {
+            mCloseGuard.warnIfOpen();
+            stopWithError(VideoRecordEvent.Finalize.ERROR_RECORDING_GARBAGE_COLLECTED,
+                    new RuntimeException("Recording stopped due to being garbage collected."));
+        } finally {
+            super.finalize();
+        }
+    }
+
+    /** Returns the recording ID which is unique to the recorder that generated this recording. */
+    long getRecordingId() {
+        return mRecordingId;
+    }
+
+    /**
+     * Returns whether the recording is closed.
+     *
+     * <p>The returned value does not reflect the state of the recording; it only reflects
+     * whether {@link #stop()} or {@link #close()} was called on this object.
+     *
+     * <p>The state of the recording should be checked from the listener passed to
+     * {@link PendingRecording#start(Executor, Consumer)}. Once the active recording is
+     * stopped, a {@link VideoRecordEvent.Finalize} event will be sent to the listener.
+     *
+     */
+    @RestrictTo(LIBRARY_GROUP)
+    public boolean isClosed() {
+        return mIsClosed.get();
+    }
+
+    private void stopWithError(@VideoRecordEvent.Finalize.VideoRecordError int error,
+            @Nullable Throwable errorCause) {
+        mCloseGuard.close();
+        if (mIsClosed.getAndSet(true)) {
+            return;
+        }
+        mRecorder.stop(this, error, errorCause);
+    }
+}
+

app/src/main/java/androidx/camera/video/originals/merge.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+set -e
+
+for i in "PendingRecording" "Recording" "Recorder"; do
+	diff3 -m ../Suckless$i.java base/$i.java new/$i.java > Suckless$i.java && mv Suckless$i.java ..
+done
+diff3 -m ../internal/encoder/SucklessEncoderImpl.java base/EncoderImpl.java new/EncoderImpl.java > SucklessEncoderImpl.java && mv SucklessEncoderImpl.java ../internal/encoder/SucklessEncoderImpl.java

app/src/main/java/androidx/camera/video/originals/update.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+rm -r base && mv new base

app/src/main/java/sushi/hardcore/droidfs/BaseActivity.kt

@@ -4,50 +4,21 @@ import android.content.SharedPreferences
 import android.os.Bundle
 import android.view.WindowManager
 import androidx.appcompat.app.AppCompatActivity
-import androidx.preference.PreferenceManager
 
 open class BaseActivity: AppCompatActivity() {
     protected lateinit var sharedPrefs: SharedPreferences
-    lateinit var themeValue: String
+    protected var applyCustomTheme: Boolean = true
-    private var shouldCheckTheme = true
+    lateinit var theme: Theme
 
     override fun onCreate(savedInstanceState: Bundle?) {
-        sharedPrefs = PreferenceManager.getDefaultSharedPreferences(this)
-        if (shouldCheckTheme) {
-            themeValue = sharedPrefs.getString("theme", ConstValues.DEFAULT_THEME_VALUE)!!
-            when (themeValue) {
-                "black_green" -> setTheme(R.style.BlackGreen)
-                "dark_red" -> setTheme(R.style.DarkRed)
-                "black_red" -> setTheme(R.style.BlackRed)
-                "dark_blue" -> setTheme(R.style.DarkBlue)
-                "black_blue" -> setTheme(R.style.BlackBlue)
-                "dark_yellow" -> setTheme(R.style.DarkYellow)
-                "black_yellow" -> setTheme(R.style.BlackYellow)
-                "dark_orange" -> setTheme(R.style.DarkOrange)
-                "black_orange" -> setTheme(R.style.BlackOrange)
-                "dark_purple" -> setTheme(R.style.DarkPurple)
-                "black_purple" -> setTheme(R.style.BlackPurple)
-            }
-        } else {
-            shouldCheckTheme = true
-        }
         super.onCreate(savedInstanceState)
-        if (!sharedPrefs.getBoolean("usf_screenshot", false)){
+        sharedPrefs = (application as VolumeManagerApp).sharedPreferences
+        theme = Theme.fromSharedPrefs(sharedPrefs)
+        if (applyCustomTheme) {
+            setTheme(theme.toResourceId())
+        }
+        if (!sharedPrefs.getBoolean("usf_screenshot", false)) {
             window.setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE)
         }
     }
-
-    override fun onStart() {
-        super.onStart()
-        val newThemeValue = sharedPrefs.getString("theme", "dark_green")!!
-        onThemeChanged(newThemeValue)
-    }
-
-    fun onThemeChanged(newThemeValue: String) {
-        if (newThemeValue != themeValue) {
-            themeValue = newThemeValue
-            shouldCheckTheme = false
-            recreate()
-        }
-    }
 }

app/src/main/java/sushi/hardcore/droidfs/CameraActivity.kt

@@ -2,10 +2,7 @@ package sushi.hardcore.droidfs
 
 import android.Manifest
 import android.annotation.SuppressLint
-import android.content.Context
 import android.content.pm.PackageManager
-import android.hardware.camera2.CameraCharacteristics
-import android.hardware.camera2.CameraManager
 import android.os.Build
 import android.os.Bundle
 import android.text.InputType
@@ -18,21 +15,38 @@ import android.widget.ImageView
 import android.widget.RelativeLayout
 import android.widget.Toast
 import androidx.annotation.RequiresApi
-import androidx.camera.camera2.interop.Camera2CameraInfo
+import androidx.camera.core.AspectRatio
-import androidx.camera.core.*
+import androidx.camera.core.Camera
+import androidx.camera.core.CameraSelector
+import androidx.camera.core.DynamicRange
+import androidx.camera.core.FocusMeteringAction
+import androidx.camera.core.ImageCapture
+import androidx.camera.core.ImageCaptureException
+import androidx.camera.core.Preview
+import androidx.camera.core.UseCase
+import androidx.camera.core.resolutionselector.ResolutionSelector
 import androidx.camera.extensions.ExtensionMode
 import androidx.camera.extensions.ExtensionsManager
 import androidx.camera.lifecycle.ProcessCameraProvider
+import androidx.camera.video.MuxerOutputOptions
+import androidx.camera.video.Quality
+import androidx.camera.video.QualitySelector
+import androidx.camera.video.SucklessRecorder
+import androidx.camera.video.SucklessRecording
+import androidx.camera.video.VideoCapture
+import androidx.camera.video.VideoRecordEvent
 import androidx.core.app.ActivityCompat
 import androidx.core.content.ContextCompat
 import androidx.lifecycle.lifecycleScope
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
-import sushi.hardcore.droidfs.content_providers.RestrictedFileProvider
 import sushi.hardcore.droidfs.databinding.ActivityCameraBinding
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.util.IntentUtils
 import sushi.hardcore.droidfs.util.PathUtils
+import sushi.hardcore.droidfs.video_recording.AsynchronousSeekableWriter
+import sushi.hardcore.droidfs.video_recording.FFmpegMuxer
 import sushi.hardcore.droidfs.video_recording.SeekableWriter
-import sushi.hardcore.droidfs.video_recording.VideoCapture
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import sushi.hardcore.droidfs.widgets.EditTextDialog
 import java.io.ByteArrayInputStream
@@ -40,7 +54,10 @@ import java.io.ByteArrayOutputStream
 import java.text.SimpleDateFormat
 import java.util.*
 import java.util.concurrent.Executor
+import kotlin.math.pow
+import kotlin.math.sqrt
 
+@SuppressLint("RestrictedApi")
 class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
     companion object {
         private const val CAMERA_PERMISSION_REQUEST_CODE = 0
@@ -60,14 +77,12 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
                 binding.imageTimer.setImageResource(R.drawable.icon_timer_off)
             }
         }
-    private var usf_keep_open = false
     private lateinit var sensorOrientationListener: SensorOrientationListener
+    private var currentRotation = 0
     private var previousOrientation: Float = 0f
     private lateinit var orientedIcons: List<ImageView>
-    private lateinit var gocryptfsVolume: GocryptfsVolume
+    private lateinit var encryptedVolume: EncryptedVolume
     private lateinit var outputDirectory: String
-    private var isFinishingIntentionally = false
-    private var isAskingPermissions = false
     private var permissionsGranted = false
     private lateinit var executor: Executor
     private lateinit var cameraProvider: ProcessCameraProvider
@@ -75,11 +90,17 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
     private lateinit var cameraSelector: CameraSelector
     private val cameraPreview = Preview.Builder().build()
     private var imageCapture: ImageCapture? = null
-    private var videoCapture: VideoCapture? = null
+    private var videoCapture: VideoCapture<SucklessRecorder>? = null
+    private var videoRecorder: SucklessRecorder? = null
+    private var videoRecording: SucklessRecording? = null
     private var camera: Camera? = null
     private var resolutions: List<Size>? = null
     private var currentResolutionIndex: Int = 0
     private var currentResolution: Size? = null
+    private val aspectRatios = arrayOf(AspectRatio.RATIO_16_9, AspectRatio.RATIO_4_3)
+    private var currentAspectRatioIndex = 0
+    private var qualities: List<Quality>? = null
+    private var currentQualityIndex = -1
     private var captureMode = ImageCapture.CAPTURE_MODE_MAXIMIZE_QUALITY
     private var isBackCamera = true
     private var isInVideoMode = false
@@ -89,18 +110,16 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        usf_keep_open = sharedPrefs.getBoolean("usf_keep_open", false)
         binding = ActivityCameraBinding.inflate(layoutInflater)
         setContentView(binding.root)
         supportActionBar?.hide()
-        gocryptfsVolume = GocryptfsVolume(applicationContext, intent.getIntExtra("sessionID", -1))
+        encryptedVolume = IntentUtils.getParcelableExtra(intent, "volume")!!
         outputDirectory = intent.getStringExtra("path")!!
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
             if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED){
                 permissionsGranted = true
             } else {
-                isAskingPermissions = true
                 requestPermissions(arrayOf(Manifest.permission.CAMERA), CAMERA_PERMISSION_REQUEST_CODE)
             }
         } else {
@@ -122,50 +141,76 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
         }
 
         binding.imageCaptureMode.setOnClickListener {
-            val currentIndex = if (captureMode == ImageCapture.CAPTURE_MODE_MAXIMIZE_QUALITY) {
+            if (isInVideoMode) {
-                0
+                qualities?.let { qualities ->
-            } else {
+                    val qualityNames = qualities.map {
-                1
+                        when (it) {
-            }
+                            Quality.UHD -> "UHD"
-            CustomAlertDialogBuilder(this, themeValue)
+                            Quality.FHD -> "FHD"
-                .setTitle(R.string.camera_optimization)
+                            Quality.HD -> "HD"
-                .setSingleChoiceItems(arrayOf(getString(R.string.maximize_quality), getString(R.string.minimize_latency)), currentIndex) { dialog, which ->
+                            Quality.SD -> "SD"
-                    val resId: Int
+                            else -> throw IllegalArgumentException("Invalid quality: $it")
-                    val newCaptureMode = if (which == 0) {
-                        resId = R.drawable.icon_high_quality
-                        ImageCapture.CAPTURE_MODE_MAXIMIZE_QUALITY
-                    } else {
-                        resId = R.drawable.icon_speed
-                        ImageCapture.CAPTURE_MODE_MINIMIZE_LATENCY
-                    }
-                    if (newCaptureMode != captureMode) {
-                        captureMode = newCaptureMode
-                        binding.imageCaptureMode.setImageResource(resId)
-                        if (!isInVideoMode) {
-                            cameraProvider.unbind(imageCapture)
-                            refreshImageCapture()
-                            cameraProvider.bindToLifecycle(this, cameraSelector, imageCapture)
                         }
-                    }
+                    }.toTypedArray()
-                    dialog.dismiss()
+                    CustomAlertDialogBuilder(this, theme)
+                        .setTitle("Choose quality:")
+                        .setSingleChoiceItems(qualityNames, currentQualityIndex) { dialog, which ->
+                            currentQualityIndex = which
+                            rebindUseCases()
+                            dialog.dismiss()
+                        }
+                        .setNegativeButton(R.string.cancel, null)
+                        .show()
                 }
-                .setNegativeButton(R.string.cancel, null)
+            } else {
-                .show()
+                CustomAlertDialogBuilder(this, theme)
-        }
+                    .setTitle(R.string.camera_optimization)
-        binding.imageRatio.setOnClickListener {
+                    .setSingleChoiceItems(
-            resolutions?.let {
+                        arrayOf(getString(R.string.maximize_quality), getString(R.string.minimize_latency)),
-                CustomAlertDialogBuilder(this, themeValue)
+                        if (captureMode == ImageCapture.CAPTURE_MODE_MAXIMIZE_QUALITY) 0 else 1
-                    .setTitle(R.string.choose_resolution)
+                    ) { dialog, which ->
-                    .setSingleChoiceItems(it.map { size -> size.toString() }.toTypedArray(), currentResolutionIndex) { dialog, which ->
+                        val newCaptureMode = if (which == 0) {
-                        currentResolution = resolutions!![which]
+                            ImageCapture.CAPTURE_MODE_MAXIMIZE_QUALITY
-                        currentResolutionIndex = which
+                        } else {
-                        setupCamera()
+                            ImageCapture.CAPTURE_MODE_MINIMIZE_LATENCY
+                        }
+                        if (newCaptureMode != captureMode) {
+                            captureMode = newCaptureMode
+                            setCaptureModeIcon()
+                            rebindUseCases()
+                        }
                         dialog.dismiss()
                     }
                     .setNegativeButton(R.string.cancel, null)
                     .show()
             }
         }
+        binding.imageRatio.setOnClickListener {
+            if (isInVideoMode) {
+                CustomAlertDialogBuilder(this, theme)
+                    .setTitle("Aspect ratio:")
+                    .setSingleChoiceItems(arrayOf("16:9", "4:3"), currentAspectRatioIndex) { dialog, which ->
+                        currentAspectRatioIndex = which
+                        rebindUseCases()
+                        dialog.dismiss()
+                    }
+                    .setNegativeButton(R.string.cancel, null)
+                    .show()
+            } else {
+                resolutions?.let {
+                    CustomAlertDialogBuilder(this, theme)
+                        .setTitle(R.string.choose_resolution)
+                        .setSingleChoiceItems(it.map { size -> size.toString() }.toTypedArray(), currentResolutionIndex) { dialog, which ->
+                            currentResolution = resolutions!![which]
+                            currentResolutionIndex = which
+                            rebindUseCases()
+                            dialog.dismiss()
+                        }
+                        .setNegativeButton(R.string.cancel, null)
+                        .show()
+                }
+            }
+        }
         binding.imageTimer.setOnClickListener {
             with (EditTextDialog(this, R.string.enter_timer_duration) {
                 try {
@@ -211,19 +256,19 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
         }
         binding.imageModeSwitch.setOnClickListener {
             isInVideoMode = !isInVideoMode
-            setupCamera()
+            rebindUseCases()
             binding.imageFlash.setImageResource(if (isInVideoMode) {
                 binding.recordVideoButton.visibility = View.VISIBLE
                 binding.takePhotoButton.visibility = View.GONE
                 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                     if (ActivityCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
-                        isAskingPermissions = true
                         requestPermissions(arrayOf(Manifest.permission.RECORD_AUDIO), AUDIO_PERMISSION_REQUEST_CODE)
                     }
                 }
-                binding.imageModeSwitch.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.icon_photo)?.also {
+                binding.imageModeSwitch.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.icon_photo)?.mutate()?.also {
                     it.setTint(ContextCompat.getColor(this, R.color.neutralIconTint))
                 })
+                setCaptureModeIcon()
                 imageCapture?.flashMode = ImageCapture.FLASH_MODE_OFF
                 R.drawable.icon_flash_off
             } else {
@@ -248,6 +293,7 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
                 true
             }
             resolutions = null
+            qualities = null
             setupCamera()
         }
         binding.takePhotoButton.onClick = ::onClickTakePhoto
@@ -282,21 +328,17 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
     @RequiresApi(Build.VERSION_CODES.M)
     override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
         super.onRequestPermissionsResult(requestCode, permissions, grantResults)
-        isAskingPermissions = false
         if (grantResults.size == 1) {
             when (requestCode) {
                 CAMERA_PERMISSION_REQUEST_CODE -> if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                     permissionsGranted = true
                     setupCamera()
                 } else {
-                    CustomAlertDialogBuilder(this, themeValue)
+                    CustomAlertDialogBuilder(this, theme)
                         .setTitle(R.string.error)
                         .setMessage(R.string.camera_perm_needed)
                         .setCancelable(false)
-                        .setPositiveButton(R.string.ok) { _, _ ->
+                        .setPositiveButton(R.string.ok) { _, _ -> finish() }.show()
-                            isFinishingIntentionally = true
-                            finish()
-                        }.show()
                 }
                 AUDIO_PERMISSION_REQUEST_CODE -> if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                     if (videoCapture != null) {
@@ -308,6 +350,18 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
         }
     }
 
+    private fun setCaptureModeIcon() {
+        binding.imageCaptureMode.setImageResource(if (isInVideoMode) {
+           R.drawable.icon_high_quality
+        } else {
+             if (captureMode == ImageCapture.CAPTURE_MODE_MINIMIZE_LATENCY) {
+                 R.drawable.icon_speed
+             } else {
+                 R.drawable.icon_high_quality
+             }
+        })
+    }
+
     private fun adaptPreviewSize(resolution: Size) {
         val screenWidth = resources.displayMetrics.widthPixels
         val screenHeight = resources.displayMetrics.heightPixels
@@ -327,62 +381,70 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
         imageCapture = ImageCapture.Builder()
             .setCaptureMode(captureMode)
             .setFlashMode(imageCapture?.flashMode ?: ImageCapture.FLASH_MODE_AUTO)
-            .apply {
+            .setResolutionSelector(ResolutionSelector.Builder().setResolutionFilter { supportedSizes, _ ->
-                currentResolution?.let {
+                resolutions = supportedSizes.sortedBy {
-                    setTargetResolution(it)
+                    -it.width*it.height
                 }
-            }
+                currentResolution?.let { targetResolution ->
+                    return@setResolutionFilter supportedSizes.sortedBy {
+                        sqrt((it.width - targetResolution.width).toDouble().pow(2) + (it.height - targetResolution.height).toDouble().pow(2))
+                    }
+                }
+                supportedSizes
+            }.build())
+            .setTargetRotation(currentRotation)
             .build()
     }
 
     private fun refreshVideoCapture() {
-        videoCapture = VideoCapture.Builder().apply {
+        val recorderBuilder = SucklessRecorder.Builder()
-            currentResolution?.let {
+            .setExecutor(executor)
-                setTargetResolution(it)
+            .setAspectRatio(aspectRatios[currentAspectRatioIndex])
-            }
+        if (currentQualityIndex != -1) {
-        }.build()
+            recorderBuilder.setQualitySelector(QualitySelector.from(qualities!![currentQualityIndex]))
+        }
+        videoRecorder = recorderBuilder.build()
+        videoCapture = VideoCapture.withOutput(videoRecorder!!).apply {
+            targetRotation = currentRotation
+        }
+    }
+
+    private fun rebindUseCases(): UseCase {
+        cameraProvider.unbindAll()
+        val currentUseCase = (if (isInVideoMode) {
+            refreshVideoCapture()
+            camera = cameraProvider.bindToLifecycle(this, cameraSelector, cameraPreview, videoCapture)
+            if (qualities == null) {
+                qualities = SucklessRecorder.getVideoCapabilities(camera!!.cameraInfo).getSupportedQualities(DynamicRange.UNSPECIFIED)
+            }
+            videoCapture
+        } else {
+            refreshImageCapture()
+            camera = cameraProvider.bindToLifecycle(this, cameraSelector, cameraPreview, imageCapture)
+            imageCapture
+        })!!
+        adaptPreviewSize(currentUseCase.attachedSurfaceResolution!!.swap())
+        return currentUseCase
     }
 
-    @SuppressLint("RestrictedApi")
     private fun setupCamera() {
         if (permissionsGranted && ::extensionsManager.isInitialized && ::cameraProvider.isInitialized) {
             cameraSelector = if (isBackCamera){ CameraSelector.DEFAULT_BACK_CAMERA } else { CameraSelector.DEFAULT_FRONT_CAMERA }
             if (extensionsManager.isExtensionAvailable(cameraSelector, ExtensionMode.AUTO)) {
                 cameraSelector = extensionsManager.getExtensionEnabledCameraSelector(cameraSelector, ExtensionMode.AUTO)
             }
-
+            rebindUseCases()
-            cameraProvider.unbindAll()
-
-            val currentUseCase = (if (isInVideoMode) {
-                refreshVideoCapture()
-                camera = cameraProvider.bindToLifecycle(this, cameraSelector, cameraPreview, videoCapture)
-                videoCapture
-            } else {
-                refreshImageCapture()
-                camera = cameraProvider.bindToLifecycle(this, cameraSelector, cameraPreview, imageCapture)
-                imageCapture
-            })!!
-
-            adaptPreviewSize(currentResolution ?: currentUseCase.attachedSurfaceResolution!!.swap())
-
-            if (resolutions == null) {
-                val info = Camera2CameraInfo.from(camera!!.cameraInfo)
-                val cameraManager = getSystemService(Context.CAMERA_SERVICE) as CameraManager
-                val characteristics = cameraManager.getCameraCharacteristics(info.cameraId)
-                characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP)?.let { streamConfigurationMap ->
-                    resolutions = streamConfigurationMap.getOutputSizes(currentUseCase.imageFormat).map { it.swap() }
-                }
-            }
         }
     }
 
     private fun getOutputPath(isVideo: Boolean): String {
         val baseName = if (isVideo) {"VID"} else {"IMG"}+'_'+dateFormat.format(Date())+'_'
-        var fileName: String
+        var outputPath: String
         do {
-            fileName = baseName+(random.nextInt(fileNameRandomMax-fileNameRandomMin)+fileNameRandomMin)+'.'+ if (isVideo) {"mp4"} else {"jpg"}
+            val fileName = baseName+(random.nextInt(fileNameRandomMax-fileNameRandomMin)+fileNameRandomMin)+'.'+ if (isVideo) {"mp4"} else {"jpg"}
-        } while (gocryptfsVolume.pathExists(fileName))
+            outputPath = PathUtils.pathJoin(outputDirectory, fileName)
-        return PathUtils.pathJoin(outputDirectory, fileName)
+        } while (encryptedVolume.pathExists(outputPath))
+        return outputPath
     }
 
     private fun startTimerThen(action: () -> Unit) {
@@ -415,17 +477,13 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
                     imageCapture.takePicture(outputOptions, executor, object : ImageCapture.OnImageSavedCallback {
                         override fun onImageSaved(outputFileResults: ImageCapture.OutputFileResults) {
                             binding.takePhotoButton.onPhotoTaken()
-                            if (gocryptfsVolume.importFile(ByteArrayInputStream(outputBuff.toByteArray()), outputPath)) {
+                            if (encryptedVolume.importFile(ByteArrayInputStream(outputBuff.toByteArray()), outputPath)) {
                                 Toast.makeText(applicationContext, getString(R.string.picture_save_success, outputPath), Toast.LENGTH_SHORT).show()
                             } else {
-                                CustomAlertDialogBuilder(this@CameraActivity, themeValue)
+                                CustomAlertDialogBuilder(this@CameraActivity, theme)
                                     .setTitle(R.string.error)
                                     .setMessage(R.string.picture_save_failed)
-                                    .setCancelable(false)
+                                    .setPositiveButton(R.string.ok, null)
-                                    .setPositiveButton(R.string.ok) { _, _ ->
-                                        isFinishingIntentionally = true
-                                        finish()
-                                    }
                                     .show()
                             }
                         }
@@ -442,71 +500,88 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
     @SuppressLint("MissingPermission")
     private fun onClickRecordVideo() {
         if (isRecording) {
-            videoCapture?.stopRecording()
+            videoRecording?.stop()
-            isRecording = false
         } else if (!isWaitingForTimer) {
             val path = getOutputPath(true)
-            startTimerThen {
+            val fileHandle = encryptedVolume.openFileWriteMode(path)
-                val handleId = gocryptfsVolume.openWriteMode(path)
+            if (fileHandle == -1L) {
-                videoCapture?.startRecording(VideoCapture.OutputFileOptions(object : SeekableWriter {
+                CustomAlertDialogBuilder(this, theme)
-                    var offset = 0L
+                    .setTitle(R.string.error)
-                    override fun write(byteArray: ByteArray) {
+                    .setMessage(R.string.file_creation_failed)
-                        offset += gocryptfsVolume.writeFile(handleId, offset, byteArray, byteArray.size)
+                    .setPositiveButton(R.string.ok, null)
-                    }
+                    .show()
-                    override fun seek(offset: Long) {
+                return
-                        this.offset = offset
-                    }
-                    override fun close() {
-                        gocryptfsVolume.closeFile(handleId)
-                    }
-                }), executor, object : VideoCapture.OnVideoSavedCallback {
-                    override fun onVideoSaved() {
-                        Toast.makeText(applicationContext, getString(R.string.video_save_success, path), Toast.LENGTH_SHORT).show()
-                        binding.recordVideoButton.setImageResource(R.drawable.record_video_button)
-                    }
-                    override fun onError(videoCaptureError: Int, message: String, cause: Throwable?) {
-                        Toast.makeText(applicationContext, message, Toast.LENGTH_SHORT).show()
-                        cause?.printStackTrace()
-                        binding.recordVideoButton.setImageResource(R.drawable.record_video_button)
-                    }
-                })
-                binding.recordVideoButton.setImageResource(R.drawable.stop_recording_video_button)
-                isRecording = true
             }
-        }
+            val writer = AsynchronousSeekableWriter(object : SeekableWriter {
-    }
+                private var offset = 0L
 
-    override fun onDestroy() {
+                override fun close() {
-        super.onDestroy()
+                    encryptedVolume.closeFile(fileHandle)
-        if (!isFinishingIntentionally) {
+                }
-            gocryptfsVolume.close()
-            RestrictedFileProvider.wipeAll(this)
-        }
-    }
 
-    override fun onStop() {
+                override fun seek(offset: Long) {
-        super.onStop()
+                    this.offset = offset
-        if (!isFinishing && !usf_keep_open){
+                }
-            finish()
+
+                override fun write(buffer: ByteArray, size: Int) {
+                    offset += encryptedVolume.write(fileHandle, offset, buffer, 0, size.toLong())
+                }
+            })
+            val pendingRecording = videoRecorder!!.prepareRecording(
+                this,
+                MuxerOutputOptions(FFmpegMuxer(writer))
+            ).also {
+                if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M || ActivityCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) == PackageManager.PERMISSION_GRANTED) {
+                    it.withAudioEnabled()
+                }
+            }
+            startTimerThen {
+                writer.start()
+                videoRecording = pendingRecording.start(executor) {
+                    val buttons = arrayOf(binding.imageCaptureMode, binding.imageRatio, binding.imageTimer, binding.imageModeSwitch, binding.imageCameraSwitch)
+                    when (it) {
+                        is VideoRecordEvent.Start -> {
+                            binding.recordVideoButton.setImageResource(R.drawable.stop_recording_video_button)
+                            for (i in buttons) {
+                                i.isEnabled = false
+                                i.alpha = 0.5F
+                            }
+                            isRecording = true
+                        }
+                        is VideoRecordEvent.Finalize -> {
+                            if (it.hasError()) {
+                                it.cause?.printStackTrace()
+                                Toast.makeText(applicationContext, it.cause?.message ?: ("Error: " + it.error), Toast.LENGTH_SHORT).show()
+                                videoRecording?.close()
+                                videoRecording = null
+                            } else {
+                                Toast.makeText(applicationContext, getString(R.string.video_save_success, path), Toast.LENGTH_SHORT).show()
+                            }
+                            binding.recordVideoButton.setImageResource(R.drawable.record_video_button)
+                            for (i in buttons) {
+                                i.isEnabled = true
+                                i.alpha = 1F
+                            }
+                            isRecording = false
+                        }
+                    }
+                }
+            }
         }
     }
 
     override fun onPause() {
         super.onPause()
         sensorOrientationListener.remove(this)
-        if (!isAskingPermissions && !usf_keep_open) {
-            finish()
-        }
     }
 
     override fun onResume() {
         super.onResume()
-        sensorOrientationListener.addListener(this)
+        if (encryptedVolume.isClosed()) {
-    }
+            finish()
-
+        } else {
-    override fun onBackPressed() {
+            sensorOrientationListener.addListener(this)
-        super.onBackPressed()
+        }
-        isFinishingIntentionally = true
     }
 
     override fun onOrientationChange(newOrientation: Int) {
@@ -527,7 +602,8 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
         orientedIcons.map { it.startAnimation(rotateAnimation) }
         previousOrientation = realOrientation
         imageCapture?.targetRotation = newOrientation
-        videoCapture?.setTargetRotation(newOrientation)
+        videoCapture?.targetRotation = newOrientation
+        currentRotation = newOrientation
     }
 }
 

app/src/main/java/sushi/hardcore/droidfs/ChangePasswordActivity.kt

@@ -1,28 +1,39 @@
 package sushi.hardcore.droidfs
 
 import android.annotation.SuppressLint
+import android.content.Context
 import android.os.Build
 import android.os.Bundle
 import android.text.InputType
 import android.view.MenuItem
 import android.view.View
+import android.view.inputmethod.InputMethodManager
 import android.widget.Toast
 import androidx.lifecycle.lifecycleScope
 import sushi.hardcore.droidfs.databinding.ActivityChangePasswordBinding
+import sushi.hardcore.droidfs.filesystems.CryfsVolume
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.filesystems.GocryptfsVolume
+import sushi.hardcore.droidfs.util.IntentUtils
+import sushi.hardcore.droidfs.util.ObjRef
+import sushi.hardcore.droidfs.util.UIUtils
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import java.util.*
 
 class ChangePasswordActivity: BaseActivity() {
 
     private lateinit var binding: ActivityChangePasswordBinding
-    private lateinit var volume: Volume
+    private lateinit var volume: VolumeData
     private lateinit var volumeDatabase: VolumeDatabase
     private var fingerprintProtector: FingerprintProtector? = null
     private var usfFingerprint: Boolean = false
+    private val inputMethodManager by lazy {
+        getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
+    }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        volume = intent.getParcelableExtra("volume")!!
+        volume = IntentUtils.getParcelableExtra(intent, "volume")!!
         binding = ActivityChangePasswordBinding.inflate(layoutInflater)
         setContentView(binding.root)
         title = getString(R.string.change_password)
@@ -31,20 +42,33 @@ class ChangePasswordActivity: BaseActivity() {
         volumeDatabase = VolumeDatabase(this)
         usfFingerprint = sharedPrefs.getBoolean("usf_fingerprint", false)
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
-            fingerprintProtector = FingerprintProtector.new(this, themeValue, volumeDatabase)
+            fingerprintProtector = FingerprintProtector.new(this, theme, volumeDatabase)
             if (fingerprintProtector != null && volume.encryptedHash != null) {
-                binding.textCurrentPasswordLabel.visibility = View.GONE
+                binding.fingerprintSwitchContainer.visibility = View.VISIBLE
-                binding.editCurrentPassword.visibility = View.GONE
             }
         }
         if (!usfFingerprint || fingerprintProtector == null) {
             binding.checkboxSavePassword.visibility = View.GONE
         }
-        if (sharedPrefs.getBoolean(ConstValues.PIN_PASSWORDS_KEY, false)) {
+        if (sharedPrefs.getBoolean(Constants.PIN_PASSWORDS_KEY, false)) {
             arrayOf(binding.editCurrentPassword, binding.editNewPassword, binding.editPasswordConfirm).forEach {
                 it.inputType = InputType.TYPE_CLASS_NUMBER or InputType.TYPE_NUMBER_VARIATION_PASSWORD
             }
         }
+        binding.fingerprintSwitchContainer.setOnClickListener {
+            binding.switchUseFingerprint.toggle()
+        }
+        binding.switchUseFingerprint.setOnCheckedChangeListener { _, isChecked ->
+            if (isChecked && binding.editCurrentPassword.hasFocus()) {
+                binding.editCurrentPassword.clearFocus()
+                inputMethodManager.hideSoftInputFromWindow(binding.editCurrentPassword.windowToken, 0)
+            }
+        }
+        binding.editCurrentPassword.setOnFocusChangeListener { _, hasFocus ->
+            if (hasFocus) {
+                binding.switchUseFingerprint.isChecked = false
+            }
+        }
         binding.editPasswordConfirm.setOnEditorActionListener { _, _, _ ->
             changeVolumePassword()
             true
@@ -65,35 +89,35 @@ class ChangePasswordActivity: BaseActivity() {
     }
 
     private fun changeVolumePassword() {
-        val newPassword = CharArray(binding.editNewPassword.text.length)
+        val newPassword = UIUtils.encodeEditTextContent(binding.editNewPassword)
-        binding.editNewPassword.text.getChars(0, newPassword.size, newPassword, 0)
+        val newPasswordConfirm = UIUtils.encodeEditTextContent(binding.editPasswordConfirm)
-        val newPasswordConfirm = CharArray(binding.editPasswordConfirm.text.length)
-        binding.editPasswordConfirm.text.getChars(0, newPasswordConfirm.size, newPasswordConfirm, 0)
         @SuppressLint("NewApi")
         if (!newPassword.contentEquals(newPasswordConfirm)) {
             Toast.makeText(this, R.string.passwords_mismatch, Toast.LENGTH_SHORT).show()
-            Arrays.fill(newPassword, 0.toChar())
+            Arrays.fill(newPassword, 0)
         } else {
             var changeWithCurrentPassword = true
             volume.encryptedHash?.let { encryptedHash ->
                 volume.iv?.let { iv ->
                     fingerprintProtector?.let {
-                        changeWithCurrentPassword = false
+                        if (binding.switchUseFingerprint.isChecked) {
-                        it.listener = object : FingerprintProtector.Listener {
+                            changeWithCurrentPassword = false
-                            override fun onHashStorageReset() {
+                            it.listener = object : FingerprintProtector.Listener {
-                                showCurrentPasswordInput()
+                                override fun onHashStorageReset() {
-                                volume.encryptedHash = null
+                                    showCurrentPasswordInput()
-                                volume.iv = null
+                                    volume.encryptedHash = null
-                            }
+                                    volume.iv = null
-                            override fun onPasswordHashDecrypted(hash: ByteArray) {
+                                }
-                                changeVolumePassword(newPassword, hash)
+                                override fun onPasswordHashDecrypted(hash: ByteArray) {
-                            }
+                                    changeVolumePassword(newPassword, hash)
-                            override fun onPasswordHashSaved() {}
+                                }
-                            override fun onFailed(pending: Boolean) {
+                                override fun onPasswordHashSaved() {}
-                                Arrays.fill(newPassword, 0.toChar())
+                                override fun onFailed(pending: Boolean) {
+                                    Arrays.fill(newPassword, 0)
+                                }
                             }
+                            it.loadPasswordHash(volume.name, encryptedHash, iv)
                         }
-                        it.loadPasswordHash(volume.name, encryptedHash, iv)
                     }
                 }
             }
@@ -101,30 +125,48 @@ class ChangePasswordActivity: BaseActivity() {
                 changeVolumePassword(newPassword)
             }
         }
-        Arrays.fill(newPasswordConfirm, 0.toChar())
+        Arrays.fill(newPasswordConfirm, 0)
     }
 
-    private fun changeVolumePassword(newPassword: CharArray, givenHash: ByteArray? = null) {
+    private fun changeVolumePassword(newPassword: ByteArray, givenHash: ByteArray? = null) {
-        var returnedHash: ByteArray? = null
+        val returnedHash: ObjRef<ByteArray?>? = if (binding.checkboxSavePassword.isChecked) {
-        if (binding.checkboxSavePassword.isChecked) {
+            ObjRef(null)
-            returnedHash = ByteArray(GocryptfsVolume.KeyLen)
+        } else {
+            null
         }
-        var currentPassword: CharArray? = null
+        val currentPassword = if (givenHash == null) {
-        if (givenHash == null) {
+            UIUtils.encodeEditTextContent(binding.editCurrentPassword)
-            currentPassword = CharArray(binding.editCurrentPassword.text.length)
+        } else {
-            binding.editCurrentPassword.text.getChars(0, currentPassword.size, currentPassword, 0)
+            null
         }
-        object : LoadingTask<Boolean>(this, themeValue, R.string.loading_msg_change_password) {
+        object : LoadingTask<Boolean>(this, theme, R.string.loading_msg_change_password) {
             override suspend fun doTask(): Boolean {
-                val success = GocryptfsVolume.changePassword(volume.getFullPath(filesDir.path), currentPassword, givenHash, newPassword, returnedHash)
+                val success = if (volume.type == EncryptedVolume.GOCRYPTFS_VOLUME_TYPE) {
+                    GocryptfsVolume.changePassword(
+                        volume.getFullPath(filesDir.path),
+                        currentPassword,
+                        givenHash,
+                        newPassword,
+                        returnedHash?.apply { value = ByteArray(GocryptfsVolume.KeyLen) }?.value
+                    )
+                } else {
+                    CryfsVolume.changePassword(
+                        volume.getFullPath(filesDir.path),
+                        filesDir.path,
+                        currentPassword,
+                        givenHash,
+                        newPassword,
+                        returnedHash
+                    )
+                }
                 if (success) {
-                    if (volumeDatabase.isHashSaved(volume.name)) {
+                    if (volumeDatabase.isHashSaved(volume)) {
                         volumeDatabase.removeHash(volume)
                     }
                 }
                 if (currentPassword != null)
-                    Arrays.fill(currentPassword, 0.toChar())
+                    Arrays.fill(currentPassword, 0)
-                Arrays.fill(newPassword, 0.toChar())
+                Arrays.fill(newPassword, 0)
                 if (givenHash != null)
                     Arrays.fill(givenHash, 0)
                 return success
@@ -137,27 +179,27 @@ class ChangePasswordActivity: BaseActivity() {
                         it.listener = object : FingerprintProtector.Listener {
                             override fun onHashStorageReset() {
                                 // retry
-                                it.savePasswordHash(volume, returnedHash)
+                                it.savePasswordHash(volume, returnedHash.value!!)
                             }
                             override fun onPasswordHashDecrypted(hash: ByteArray) {}
                             override fun onPasswordHashSaved() {
-                                Arrays.fill(returnedHash, 0)
+                                Arrays.fill(returnedHash.value!!, 0)
                                 finish()
                             }
                             override fun onFailed(pending: Boolean) {
                                 if (!pending) {
-                                    Arrays.fill(returnedHash, 0)
+                                    Arrays.fill(returnedHash.value!!, 0)
                                     finish()
                                 }
                             }
                         }
-                        it.savePasswordHash(volume, returnedHash)
+                        it.savePasswordHash(volume, returnedHash.value!!)
                     }
                 } else {
                     finish()
                 }
             } else {
-                CustomAlertDialogBuilder(this, themeValue)
+                CustomAlertDialogBuilder(this, theme)
                     .setTitle(R.string.error)
                     .setMessage(R.string.change_password_failed)
                     .setPositiveButton(R.string.ok, null)
@@ -165,4 +207,11 @@ class ChangePasswordActivity: BaseActivity() {
             }
         }
     }
+
+    override fun onStop() {
+        super.onStop()
+        binding.editCurrentPassword.text.clear()
+        binding.editNewPassword.text.clear()
+        binding.editPasswordConfirm.text.clear()
+    }
 }

app/src/main/java/sushi/hardcore/droidfs/ConstValues.kt

@@ -1,47 +0,0 @@
-package sushi.hardcore.droidfs
-
-import android.net.Uri
-import java.io.File
-
-object ConstValues {
-    const val CREATOR = "DroidFS"
-    const val FILE_MODE = 384 //0600
-    const val DIRECTORY_MODE = 448 //0700
-    const val VOLUME_DATABASE_NAME = "SavedVolumes"
-    const val SORT_ORDER_KEY = "sort_order"
-    val FAKE_URI: Uri = Uri.parse("fakeuri://droidfs")
-    const val MAX_KERNEL_WRITE = 128*1024
-    const val WIPE_PASSES = 2
-    const val SLIDESHOW_DELAY: Long = 4000
-    const val DEFAULT_THEME_VALUE = "dark_green"
-    const val THUMBNAIL_MAX_SIZE_KEY = "thumbnail_max_size"
-    const val DEFAULT_THUMBNAIL_MAX_SIZE = 10_000L
-    const val PIN_PASSWORDS_KEY = "pin_passwords"
-    private val FILE_EXTENSIONS = mapOf(
-        Pair("image", listOf("png", "jpg", "jpeg", "gif", "webp", "bmp", "heic")),
-        Pair("video", listOf("mp4", "webm", "mkv", "mov")),
-        Pair("audio", listOf("mp3", "ogg", "m4a", "wav", "flac")),
-        Pair("pdf", listOf("pdf")),
-        Pair("text", listOf("txt", "json", "conf", "log", "xml", "java", "kt", "py", "pl", "rb", "go", "c", "h", "cpp", "hpp", "rs", "sh", "bat", "js", "html", "css", "php", "yml", "yaml", "toml", "ini", "md", "properties"))
-    )
-
-    fun isExtensionType(extensionType: String, path: String): Boolean {
-        return FILE_EXTENSIONS[extensionType]?.contains(File(path).extension.lowercase()) ?: false
-    }
-
-    fun isImage(path: String): Boolean {
-        return isExtensionType("image", path)
-    }
-    fun isVideo(path: String): Boolean {
-        return isExtensionType("video", path)
-    }
-    fun isAudio(path: String): Boolean {
-        return isExtensionType("audio", path)
-    }
-    fun isPDF(path: String): Boolean {
-        return isExtensionType("pdf", path)
-    }
-    fun isText(path: String): Boolean {
-        return isExtensionType("text", path)
-    }
-}

app/src/main/java/sushi/hardcore/droidfs/Constants.kt

@@ -0,0 +1,19 @@
+package sushi.hardcore.droidfs
+
+import android.net.Uri
+
+object Constants {
+    const val VOLUME_DATABASE_NAME = "SavedVolumes"
+    const val CRYFS_LOCAL_STATE_DIR = "cryfsLocalState"
+    const val SORT_ORDER_KEY = "sort_order"
+    val FAKE_URI: Uri = Uri.parse("fakeuri://droidfs")
+    const val WIPE_PASSES = 2
+    const val IO_BUFF_SIZE = 16384
+    const val SLIDESHOW_DELAY: Long = 4000
+    const val DEFAULT_THEME_VALUE = "dark_green"
+    const val DEFAULT_VOLUME_KEY = "default_volume"
+    const val REMEMBER_VOLUME_KEY = "remember_volume"
+    const val THUMBNAIL_MAX_SIZE_KEY = "thumbnail_max_size"
+    const val DEFAULT_THUMBNAIL_MAX_SIZE = 10_000L
+    const val PIN_PASSWORDS_KEY = "pin_passwords"
+}

app/src/main/java/sushi/hardcore/droidfs/EncryptedFileProvider.kt

@@ -0,0 +1,250 @@
+package sushi.hardcore.droidfs
+
+import android.app.ActivityManager
+import android.content.Context
+import android.os.Build
+import android.os.Handler
+import android.os.ParcelFileDescriptor
+import android.system.Os
+import android.util.Log
+import androidx.preference.PreferenceManager
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.launch
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.util.Compat
+import sushi.hardcore.droidfs.util.Wiper
+import java.io.File
+import java.io.FileInputStream
+import java.io.FileOutputStream
+import java.io.InputStream
+import java.util.UUID
+
+class EncryptedFileProvider(context: Context) {
+    companion object {
+        private const val TAG = "EncryptedFileProvider"
+        fun getTmpFilesDir(context: Context) = File(context.cacheDir, "tmp")
+
+        var exportMethod = ExportMethod.AUTO
+    }
+
+    enum class ExportMethod {
+        AUTO,
+        DISK,
+        MEMORY;
+
+        companion object {
+            fun parse(value: String) = when (value) {
+                "auto" -> EncryptedFileProvider.ExportMethod.AUTO
+                "disk" -> EncryptedFileProvider.ExportMethod.DISK
+                "memory" -> EncryptedFileProvider.ExportMethod.MEMORY
+                else -> throw IllegalArgumentException("Invalid export method: $value")
+            }
+        }
+    }
+
+    private val memoryInfo = ActivityManager.MemoryInfo()
+    private val isMemFileSupported = Compat.isMemFileSupported()
+    private val tmpFilesDir by lazy { getTmpFilesDir(context) }
+    private val handler by lazy { Handler(context.mainLooper) }
+
+    init {
+        (context.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager).getMemoryInfo(
+            memoryInfo
+        )
+
+        PreferenceManager.getDefaultSharedPreferences(context)
+            .getString("export_method", null)?.let {
+                exportMethod = ExportMethod.parse(it)
+            }
+    }
+
+    class ExportedDiskFile private constructor(
+        path: String,
+        private val file: File,
+        private val handler: Handler
+    ) : ExportedFile(path) {
+        companion object {
+            fun create(path: String, tmpFilesDir: File, handler: Handler): ExportedDiskFile? {
+                val uuid = UUID.randomUUID().toString()
+                val file = File(tmpFilesDir, uuid)
+                return if (file.createNewFile()) {
+                    ExportedDiskFile(path, file, handler)
+                } else {
+                    null
+                }
+            }
+        }
+
+        override fun open(mode: Int, furtive: Boolean): ParcelFileDescriptor {
+            return if (furtive) {
+                ParcelFileDescriptor.open(file, mode, handler) {
+                    free()
+                }
+            } else {
+                ParcelFileDescriptor.open(file, mode)
+            }
+        }
+
+        override fun free() {
+            Wiper.wipe(file)
+        }
+    }
+
+    class ExportedMemFile private constructor(path: String, private val file: MemFile) :
+        ExportedFile(path) {
+        companion object {
+            fun create(path: String, size: Long): ExportedMemFile? {
+                val uuid = UUID.randomUUID().toString()
+                MemFile.create(uuid, size)?.let {
+                    return ExportedMemFile(path, it)
+                }
+                return null
+            }
+        }
+
+        override fun open(mode: Int, furtive: Boolean): ParcelFileDescriptor {
+            val fd = if (furtive) {
+                file.toParcelFileDescriptor()
+            } else {
+                file.dup()
+            }
+            if (mode and ParcelFileDescriptor.MODE_TRUNCATE != 0) {
+                Os.ftruncate(fd.fileDescriptor, 0)
+            } else {
+                FileInputStream(fd.fileDescriptor).apply {
+                    channel.position(0)
+                    close()
+                }
+            }
+            return fd
+        }
+
+        override fun free() = file.close()
+    }
+
+    abstract class ExportedFile(val path: String) {
+        var isValid = true
+            private set
+
+        fun invalidate() {
+            isValid = false
+        }
+
+        /**
+         * @param furtive If set to true, the file will be deleted when closed
+         */
+        abstract fun open(mode: Int, furtive: Boolean): ParcelFileDescriptor
+        abstract fun free()
+    }
+
+    fun createFile(
+        path: String,
+        size: Long,
+    ): ExportedFile? {
+        val diskFile by lazy { ExportedDiskFile.create(path, tmpFilesDir, handler) }
+        val memFile by lazy { ExportedMemFile.create(path, size) }
+        return when (exportMethod) {
+            ExportMethod.MEMORY -> memFile
+            ExportMethod.DISK -> diskFile
+            ExportMethod.AUTO -> {
+                if (isMemFileSupported && size < memoryInfo.availMem * 0.8) {
+                    memFile
+                } else {
+                    diskFile
+                }
+            }
+        }
+    }
+
+    fun exportFile(
+        exportedFile: ExportedFile,
+        encryptedVolume: EncryptedVolume,
+    ): Boolean {
+        val fd = exportedFile.open(ParcelFileDescriptor.MODE_WRITE_ONLY, false).fileDescriptor
+        return encryptedVolume.exportFile(exportedFile.path, FileOutputStream(fd))
+    }
+
+    enum class Error {
+        SUCCESS,
+        INVALID_STATE,
+        WRITE_ACCESS_DENIED,
+        UNSUPPORTED_APPEND,
+        UNSUPPORTED_RW,
+        ;
+
+        fun log() {
+            Log.e(
+                TAG, when (this) {
+                    SUCCESS -> "No error"
+                    INVALID_STATE -> "Read after write is not supported"
+                    WRITE_ACCESS_DENIED -> "Write access unauthorized"
+                    UNSUPPORTED_APPEND -> "Appending is not supported"
+                    UNSUPPORTED_RW -> "Read-write access requires Android 11 or later"
+                }
+            )
+        }
+    }
+
+    /**
+     * @param furtive If set to true, the file will be deleted when closed
+     */
+    fun openFile(
+        file: ExportedFile,
+        mode: String,
+        encryptedVolume: EncryptedVolume,
+        volumeScope: CoroutineScope,
+        furtive: Boolean,
+        allowWrites: Boolean,
+    ): Pair<ParcelFileDescriptor?, Error> {
+        val mode = ParcelFileDescriptor.parseMode(mode)
+        return if (mode and ParcelFileDescriptor.MODE_READ_ONLY != 0) {
+            if (!file.isValid) return Pair(null, Error.INVALID_STATE)
+            Pair(file.open(mode, furtive), Error.SUCCESS)
+        } else {
+            if (!allowWrites) {
+                return Pair(null, Error.WRITE_ACCESS_DENIED)
+            }
+
+            fun import(input: InputStream): Boolean {
+                return if (encryptedVolume.importFile(input, file.path)) {
+                    true
+                } else {
+                    Log.e(TAG, "Failed to import file")
+                    false
+                }
+            }
+
+            if (mode and ParcelFileDescriptor.MODE_WRITE_ONLY != 0) {
+                if (mode and ParcelFileDescriptor.MODE_APPEND != 0) {
+                    return Pair(null, Error.UNSUPPORTED_APPEND)
+                }
+                if (mode and ParcelFileDescriptor.MODE_TRUNCATE == 0) {
+                    Log.w(TAG, "Truncating file despite not being requested")
+                }
+                val pipe = ParcelFileDescriptor.createReliablePipe()
+                val input = FileInputStream(pipe[0].fileDescriptor)
+                volumeScope.launch {
+                    if (import(input)) {
+                        file.invalidate()
+                    }
+                }
+                Pair(pipe[1], Error.SUCCESS)
+            } else { // read-write
+                if (!file.isValid) return Pair(null, Error.INVALID_STATE)
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+                    val fd = file.open(mode, false)
+                    Pair(ParcelFileDescriptor.wrap(fd, handler) { e ->
+                        if (e == null) {
+                            import(FileInputStream(fd.fileDescriptor))
+                            if (furtive) {
+                                file.free()
+                            }
+                        }
+                    }, Error.SUCCESS)
+                } else {
+                    Pair(null, Error.UNSUPPORTED_RW)
+                }
+            }
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/FileShare.kt

@@ -0,0 +1,78 @@
+package sushi.hardcore.droidfs
+
+import android.content.Context
+import android.content.Intent
+import android.net.Uri
+import android.webkit.MimeTypeMap
+import androidx.preference.PreferenceManager
+import sushi.hardcore.droidfs.content_providers.TemporaryFileProvider
+import java.io.File
+
+class FileShare(context: Context) {
+    companion object {
+        private const val CONTENT_TYPE_ANY = "*/*"
+        private fun getContentType(filename: String, previousContentType: String?): String {
+            if (CONTENT_TYPE_ANY != previousContentType) {
+                var contentType = MimeTypeMap.getSingleton()
+                    .getMimeTypeFromExtension(File(filename).extension)
+                if (contentType == null) {
+                    contentType = CONTENT_TYPE_ANY
+                }
+                if (previousContentType == null) {
+                    return contentType
+                } else if (previousContentType != contentType) {
+                    return CONTENT_TYPE_ANY
+                }
+            }
+            return previousContentType
+        }
+    }
+
+    private val usfSafWrite = PreferenceManager.getDefaultSharedPreferences(context).getBoolean("usf_saf_write", false)
+
+    private fun exportFile(exportedFile: EncryptedFileProvider.ExportedFile, size: Long, volumeId: Int, previousContentType: String? = null): Pair<Uri, String>? {
+        val uri = TemporaryFileProvider.instance.exportFile(exportedFile, size, volumeId) ?: return null
+        return Pair(uri, getContentType(File(exportedFile.path).name, previousContentType))
+    }
+
+    fun share(files: List<Pair<String, Long>>, volumeId: Int): Pair<Intent?, Int?> {
+        var contentType: String? = null
+        val uris = ArrayList<Uri>(files.size)
+        for ((path, size) in files) {
+            val exportedFile = TemporaryFileProvider.instance.encryptedFileProvider.createFile(path, size)
+                ?: return Pair(null, R.string.export_failed_create)
+            val result = exportFile(exportedFile, size, volumeId, contentType)
+            contentType = if (result == null) {
+                return Pair(null, R.string.export_failed_export)
+            } else {
+                uris.add(result.first)
+                result.second
+            }
+        }
+        return Pair(Intent().apply {
+            type = contentType
+            if (uris.size == 1) {
+                action = Intent.ACTION_SEND
+                putExtra(Intent.EXTRA_STREAM, uris[0])
+            } else {
+                action = Intent.ACTION_SEND_MULTIPLE
+                putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris)
+            }
+        }, null)
+    }
+
+    fun openWith(exportedFile: EncryptedFileProvider.ExportedFile, size: Long, volumeId: Int): Pair<Intent?, Int?> {
+        val result = exportFile(exportedFile, size, volumeId)
+        return if (result == null) {
+            Pair(null, R.string.export_failed_export)
+        } else {
+            Pair(Intent(Intent.ACTION_VIEW).apply {
+                addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+                if (usfSafWrite) {
+                    addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
+                }
+                setDataAndType(result.first, result.second)
+            }, null)
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/FileTypes.kt

@@ -0,0 +1,87 @@
+package sushi.hardcore.droidfs
+
+import java.io.File
+
+object FileTypes {
+    private val FILE_EXTENSIONS = mapOf(
+        Pair("image", listOf("png", "jpg", "jpeg", "gif", "webp", "bmp", "heic")),
+        Pair("video", listOf("mp4", "webm", "mkv", "mov")),
+        Pair("audio", listOf("mp3", "ogg", "m4a", "wav", "flac", "opus")),
+        Pair("pdf", listOf("pdf")),
+        Pair("text", listOf(
+            "asc",
+            "asm",
+            "awk",
+            "bash",
+            "c",
+            "cfg",
+            "conf",
+            "cpp",
+            "css",
+            "csv",
+            "desktop",
+            "dot",
+            "g4",
+            "go",
+            "gradle",
+            "h",
+            "hpp",
+            "hs",
+            "html",
+            "ini",
+            "java",
+            "js",
+            "json",
+            "kt",
+            "lisp",
+            "log",
+            "lua",
+            "markdown",
+            "md",
+            "mod",
+            "org",
+            "php",
+            "pl",
+            "pro",
+            "properties",
+            "py",
+            "qml",
+            "rb",
+            "rc",
+            "rs",
+            "sh",
+            "smali",
+            "sql",
+            "srt",
+            "tex",
+            "toml",
+            "ts",
+            "txt",
+            "vala",
+            "vim",
+            "xml",
+            "yaml",
+            "yml",
+        ))
+    )
+
+    fun isExtensionType(extensionType: String, path: String): Boolean {
+        return FILE_EXTENSIONS[extensionType]?.contains(File(path).extension.lowercase()) ?: false
+    }
+
+    fun isImage(path: String): Boolean {
+        return isExtensionType("image", path)
+    }
+    fun isVideo(path: String): Boolean {
+        return isExtensionType("video", path)
+    }
+    fun isAudio(path: String): Boolean {
+        return isExtensionType("audio", path)
+    }
+    fun isPDF(path: String): Boolean {
+        return isExtensionType("pdf", path)
+    }
+    fun isText(path: String): Boolean {
+        return isExtensionType("text", path)
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/FingerprintProtector.kt

@@ -22,7 +22,7 @@ import javax.crypto.spec.GCMParameterSpec
 @RequiresApi(Build.VERSION_CODES.M)
 class FingerprintProtector private constructor(
     private val activity: FragmentActivity,
-    private val themeValue: String,
+    private val theme: Theme,
     private val volumeDatabase: VolumeDatabase,
 ) {
 
@@ -54,11 +54,11 @@ class FingerprintProtector private constructor(
 
         fun new(
             activity: FragmentActivity,
-            themeValue: String,
+            theme: Theme,
             volumeDatabase: VolumeDatabase,
         ): FingerprintProtector? {
             return if (canAuthenticate(activity) == 0)
-                FingerprintProtector(activity, themeValue, volumeDatabase)
+                FingerprintProtector(activity, theme, volumeDatabase)
             else
                 null
         }
@@ -98,7 +98,7 @@ class FingerprintProtector private constructor(
                                 listener.onPasswordHashDecrypted(plainText)
                             } catch (e: AEADBadTagException) {
                                 listener.onFailed(true)
-                                CustomAlertDialogBuilder(activity, themeValue)
+                                CustomAlertDialogBuilder(activity, theme)
                                     .setTitle(R.string.error)
                                     .setMessage(R.string.MAC_verification_failed)
                                     .setPositiveButton(R.string.reset_hash_storage) { _, _ ->
@@ -112,7 +112,7 @@ class FingerprintProtector private constructor(
                     }
                 } catch (e: IllegalBlockSizeException) {
                     listener.onFailed(true)
-                    CustomAlertDialogBuilder(activity, themeValue)
+                    CustomAlertDialogBuilder(activity, theme)
                         .setTitle(R.string.illegal_block_size_exception)
                         .setMessage(R.string.illegal_block_size_exception_msg)
                         .setPositiveButton(R.string.reset_hash_storage) { _, _ ->
@@ -133,7 +133,7 @@ class FingerprintProtector private constructor(
     private lateinit var cipher: Cipher
     private var isCipherReady = false
     private var cipherActionMode: Int? = null
-    private lateinit var volume: Volume
+    private lateinit var volume: VolumeData
     private lateinit var dataToProcess: ByteArray
 
     private fun resetHashStorage() {
@@ -159,7 +159,7 @@ class FingerprintProtector private constructor(
                     keyStore.getKey(KEY_ALIAS, null) as SecretKey
                 } catch (e: UnrecoverableKeyException) {
                     listener.onFailed(true)
-                    CustomAlertDialogBuilder(activity, themeValue)
+                    CustomAlertDialogBuilder(activity, theme)
                         .setTitle(activity.getString(R.string.unrecoverable_key_exception))
                         .setMessage(activity.getString(R.string.unrecoverable_key_exception_msg, e.localizedMessage))
                         .setPositiveButton(R.string.reset_hash_storage) { _, _ ->
@@ -196,7 +196,7 @@ class FingerprintProtector private constructor(
 
     private fun alertKeyPermanentlyInvalidatedException() {
         listener.onFailed(true)
-        CustomAlertDialogBuilder(activity, themeValue)
+        CustomAlertDialogBuilder(activity, theme)
             .setTitle(R.string.key_permanently_invalidated_exception)
             .setMessage(R.string.key_permanently_invalidated_exception_msg)
             .setPositiveButton(R.string.reset_hash_storage) { _, _ ->
@@ -207,7 +207,7 @@ class FingerprintProtector private constructor(
             .show()
     }
 
-    fun savePasswordHash(volume: Volume, plainText: ByteArray) {
+    fun savePasswordHash(volume: VolumeData, plainText: ByteArray) {
         this.volume = volume
         val biometricPromptInfo = BiometricPrompt.PromptInfo.Builder()
             .setTitle(activity.getString(R.string.encrypt_action_description))

app/src/main/java/sushi/hardcore/droidfs/GocryptfsVolume.kt

@@ -1,243 +0,0 @@
-package sushi.hardcore.droidfs
-
-import android.content.Context
-import android.net.Uri
-import sushi.hardcore.droidfs.explorers.ExplorerElement
-import sushi.hardcore.droidfs.util.PathUtils
-import java.io.File
-import java.io.FileOutputStream
-import java.io.InputStream
-import java.io.OutputStream
-
-class GocryptfsVolume(val applicationContext: Context, var sessionID: Int) {
-    private external fun native_close(sessionID: Int)
-    private external fun native_is_closed(sessionID: Int): Boolean
-    private external fun native_list_dir(sessionID: Int, dir_path: String): MutableList<ExplorerElement>
-    private external fun native_open_read_mode(sessionID: Int, file_path: String): Int
-    private external fun native_open_write_mode(sessionID: Int, file_path: String, mode: Int): Int
-    private external fun native_read_file(sessionID: Int, handleID: Int, offset: Long, buff: ByteArray): Int
-    private external fun native_write_file(sessionID: Int, handleID: Int, offset: Long, buff: ByteArray, buff_size: Int): Int
-    private external fun native_truncate(sessionID: Int, handleID: Int, offset: Long): Boolean
-    private external fun native_path_exists(sessionID: Int, file_path: String): Boolean
-    private external fun native_get_size(sessionID: Int, file_path: String): Long
-    private external fun native_close_file(sessionID: Int, handleID: Int)
-    private external fun native_remove_file(sessionID: Int, file_path: String): Boolean
-    private external fun native_mkdir(sessionID: Int, dir_path: String, mode: Int): Boolean
-    private external fun native_rmdir(sessionID: Int, dir_path: String): Boolean
-    private external fun native_rename(sessionID: Int, old_path: String, new_path: String): Boolean
-
-    companion object {
-        const val KeyLen = 32
-        const val ScryptDefaultLogN = 16
-        const val DefaultBS = 4096
-        const val CONFIG_FILE_NAME = "gocryptfs.conf"
-        external fun createVolume(root_cipher_dir: String, password: CharArray, plainTextNames: Boolean, xchacha: Int, logN: Int, creator: String, returnedHash: ByteArray?): Boolean
-        external fun init(root_cipher_dir: String, password: CharArray?, givenHash: ByteArray?, returnedHash: ByteArray?): Int
-        external fun changePassword(root_cipher_dir: String, old_password: CharArray?, givenHash: ByteArray?, new_password: CharArray, returnedHash: ByteArray?): Boolean
-
-        fun isGocryptfsVolume(path: File): Boolean {
-            if (path.isDirectory){
-                return File(path, CONFIG_FILE_NAME).isFile
-            }
-            return false
-        }
-
-        init {
-            System.loadLibrary("gocryptfs_jni")
-        }
-    }
-
-    fun close() {
-        native_close(sessionID)
-    }
-
-    fun isClosed(): Boolean {
-        return native_is_closed(sessionID)
-    }
-
-    fun listDir(dir_path: String): MutableList<ExplorerElement> {
-        return native_list_dir(sessionID, dir_path)
-    }
-
-    fun mkdir(dir_path: String): Boolean {
-        return native_mkdir(sessionID, dir_path, ConstValues.DIRECTORY_MODE)
-    }
-
-    fun rmdir(dir_path: String): Boolean {
-        return native_rmdir(sessionID, dir_path)
-    }
-
-    fun removeFile(file_path: String): Boolean {
-        return native_remove_file(sessionID, file_path)
-    }
-
-    fun pathExists(file_path: String): Boolean {
-        return native_path_exists(sessionID, file_path)
-    }
-
-    fun getSize(file_path: String): Long {
-        return native_get_size(sessionID, file_path)
-    }
-
-    fun closeFile(handleID: Int) {
-        native_close_file(sessionID, handleID)
-    }
-
-    fun openReadMode(file_path: String): Int {
-        return native_open_read_mode(sessionID, file_path)
-    }
-
-    fun openWriteMode(file_path: String): Int {
-        return native_open_write_mode(sessionID, file_path, ConstValues.FILE_MODE)
-    }
-
-    fun readFile(handleID: Int, offset: Long, buff: ByteArray): Int {
-        return native_read_file(sessionID, handleID, offset, buff)
-    }
-
-    fun writeFile(handleID: Int, offset: Long, buff: ByteArray, buff_size: Int): Int {
-        return native_write_file(sessionID, handleID, offset, buff, buff_size)
-    }
-
-    fun truncate(handleID: Int, offset: Long): Boolean {
-        return native_truncate(sessionID, handleID, offset)
-    }
-
-    fun rename(old_path: String, new_path: String): Boolean {
-        return native_rename(sessionID, old_path, new_path)
-    }
-
-    fun exportFile(handleID: Int, os: OutputStream): Boolean {
-        var offset: Long = 0
-        val ioBuffer = ByteArray(DefaultBS)
-        var length: Int
-        while (readFile(handleID, offset, ioBuffer).also { length = it } > 0){
-            os.write(ioBuffer, 0, length)
-            offset += length.toLong()
-        }
-        os.close()
-        return true
-    }
-
-    fun exportFile(src_path: String, os: OutputStream): Boolean {
-        var success = false
-        val srcHandleId = openReadMode(src_path)
-        if (srcHandleId != -1) {
-            success = exportFile(srcHandleId, os)
-            closeFile(srcHandleId)
-        }
-        return success
-    }
-
-    fun exportFile(src_path: String, dst_path: String): Boolean {
-        return exportFile(src_path, FileOutputStream(dst_path))
-    }
-
-    fun exportFile(context: Context, src_path: String, output_path: Uri): Boolean {
-        val os = context.contentResolver.openOutputStream(output_path)
-        if (os != null){
-            return exportFile(src_path, os)
-        }
-        return false
-    }
-
-    fun importFile(inputStream: InputStream, dst_path: String): Boolean {
-        val dstHandleId = openWriteMode(dst_path)
-        if (dstHandleId != -1) {
-            var success = true
-            var offset: Long = 0
-            val ioBuffer = ByteArray(DefaultBS)
-            var length: Int
-            while (inputStream.read(ioBuffer).also { length = it } > 0) {
-                val written = writeFile(dstHandleId, offset, ioBuffer, length).toLong()
-                if (written == length.toLong()) {
-                    offset += written
-                } else {
-                    inputStream.close()
-                    success = false
-                    break
-                }
-            }
-            closeFile(dstHandleId)
-            inputStream.close()
-            return success
-        }
-        return false
-    }
-
-    fun importFile(context: Context, src_uri: Uri, dst_path: String): Boolean {
-        val inputStream = context.contentResolver.openInputStream(src_uri)
-        if (inputStream != null){
-            return importFile(inputStream, dst_path)
-        }
-        return false
-    }
-
-    fun recursiveMapFiles(rootPath: String): MutableList<ExplorerElement> {
-        val result = mutableListOf<ExplorerElement>()
-        val explorerElements = listDir(rootPath)
-        result.addAll(explorerElements)
-        for (e in explorerElements){
-            if (e.isDirectory){
-                result.addAll(recursiveMapFiles(e.fullPath))
-            }
-        }
-        return result
-    }
-
-    fun recursiveRemoveDirectory(plain_directory_path: String): String? {
-        val explorerElements = listDir(plain_directory_path)
-        for (e in explorerElements) {
-            val fullPath = PathUtils.pathJoin(plain_directory_path, e.name)
-            if (e.isDirectory) {
-                val result = recursiveRemoveDirectory(fullPath)
-                result?.let { return it }
-            } else {
-                if (!removeFile(fullPath)) {
-                    return fullPath
-                }
-            }
-        }
-        return if (!rmdir(plain_directory_path)) {
-            plain_directory_path
-        } else {
-            null
-        }
-    }
-
-    fun loadWholeFile(fullPath: String, size: Long? = null, maxSize: Long? = null): Pair<ByteArray?, Int> {
-        val fileSize = size ?: getSize(fullPath)
-        return if (fileSize >= 0) {
-            maxSize?.let {
-                if (fileSize > it) {
-                    return Pair(null, 0)
-                }
-            }
-            try {
-                val fileBuff = ByteArray(fileSize.toInt())
-                val handleID = openReadMode(fullPath)
-                if (handleID == -1) {
-                    Pair(null, 3)
-                } else {
-                    var offset: Long = 0
-                    val ioBuffer = ByteArray(DefaultBS)
-                    var length: Int
-                    while (readFile(handleID, offset, ioBuffer).also { length = it } > 0) {
-                        System.arraycopy(ioBuffer, 0, fileBuff, offset.toInt(), length)
-                        offset += length.toLong()
-                    }
-                    closeFile(handleID)
-                    if (offset == fileBuff.size.toLong()) {
-                        Pair(fileBuff, 0)
-                    } else {
-                        Pair(null, 4)
-                    }
-                }
-            } catch (e: OutOfMemoryError) {
-                Pair(null, 2)
-            }
-        } else {
-            Pair(null, 1)
-        }
-    }
-}

app/src/main/java/sushi/hardcore/droidfs/LoadingTask.kt

@@ -1,6 +1,6 @@
 package sushi.hardcore.droidfs
 
-import androidx.appcompat.app.AppCompatActivity
+import androidx.fragment.app.FragmentActivity
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
@@ -8,8 +8,8 @@ import kotlinx.coroutines.withContext
 import sushi.hardcore.droidfs.databinding.DialogLoadingBinding
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 
-abstract class LoadingTask<T>(val activity: AppCompatActivity, themeValue: String, loadingMessageResId: Int) {
+abstract class LoadingTask<T>(val activity: FragmentActivity, theme: Theme, loadingMessageResId: Int) {
-    private val dialogLoading = CustomAlertDialogBuilder(activity, themeValue)
+    private val dialogLoading = CustomAlertDialogBuilder(activity, theme)
         .setView(
             DialogLoadingBinding.inflate(activity.layoutInflater).apply {
                 textMessage.text = activity.getString(loadingMessageResId)

app/src/main/java/sushi/hardcore/droidfs/LogcatActivity.kt

@@ -0,0 +1,88 @@
+package sushi.hardcore.droidfs
+
+import android.net.Uri
+import android.os.Bundle
+import android.view.Menu
+import android.view.MenuItem
+import android.widget.Toast
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.lifecycle.lifecycleScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import sushi.hardcore.droidfs.databinding.ActivityLogcatBinding
+import java.io.BufferedReader
+import java.io.BufferedWriter
+import java.io.InputStreamReader
+import java.io.InterruptedIOException
+import java.io.OutputStreamWriter
+import java.text.SimpleDateFormat
+import java.util.Date
+import java.util.Locale
+
+class LogcatActivity: BaseActivity() {
+    private lateinit var binding: ActivityLogcatBinding
+    private var process: Process? = null
+    private val dateFormat by lazy {
+        SimpleDateFormat("yyyy-MM-dd_HH:mm:ss", Locale.getDefault())
+    }
+    private val saveAs = registerForActivityResult(ActivityResultContracts.CreateDocument("text/*")) { uri ->
+        uri?.let {
+            saveTo(it)
+        }
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        binding = ActivityLogcatBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+        title = getString(R.string.logcat_title)
+        supportActionBar?.setDisplayHomeAsUpEnabled(true)
+
+        lifecycleScope.launch(Dispatchers.IO) {
+            try {
+                BufferedReader(InputStreamReader(Runtime.getRuntime().exec("logcat").also {
+                    process = it
+                }.inputStream)).forEachLine {
+                    binding.content.post {
+                        binding.content.append("$it\n")
+                    }
+                }
+            } catch (_: InterruptedIOException) {}
+        }
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        process?.destroy()
+    }
+
+    override fun onCreateOptionsMenu(menu: Menu): Boolean {
+        menuInflater.inflate(R.menu.logcat, menu)
+        return true
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        return when (item.itemId) {
+            android.R.id.home -> {
+                finish()
+                true
+            }
+            R.id.save -> {
+                saveAs.launch("DroidFS_${dateFormat.format(Date())}.log")
+                true
+            }
+            else -> super.onOptionsItemSelected(item)
+        }
+    }
+
+    private fun saveTo(uri: Uri) {
+        lifecycleScope.launch(Dispatchers.IO) {
+            BufferedWriter(OutputStreamWriter(contentResolver.openOutputStream(uri))).use {
+                it.write(binding.content.text.toString())
+            }
+            launch(Dispatchers.Main) {
+                Toast.makeText(this@LogcatActivity, R.string.logcat_saved, Toast.LENGTH_SHORT).show()
+            }
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/MainActivity.kt

@@ -1,82 +1,71 @@
 package sushi.hardcore.droidfs
 
-import android.annotation.SuppressLint
 import android.content.ComponentName
 import android.content.Context
 import android.content.Intent
 import android.content.ServiceConnection
 import android.net.Uri
-import android.os.Build
 import android.os.Bundle
 import android.os.IBinder
-import android.text.InputType
 import android.view.Menu
 import android.view.MenuItem
 import android.view.View
-import android.view.WindowManager
 import android.widget.Toast
+import androidx.activity.addCallback
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.documentfile.provider.DocumentFile
 import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.LinearLayoutManager
 import kotlinx.coroutines.launch
+import sushi.hardcore.droidfs.Constants.DEFAULT_VOLUME_KEY
 import sushi.hardcore.droidfs.adapters.VolumeAdapter
 import sushi.hardcore.droidfs.add_volume.AddVolumeActivity
-import sushi.hardcore.droidfs.content_providers.RestrictedFileProvider
+import sushi.hardcore.droidfs.content_providers.VolumeProvider
 import sushi.hardcore.droidfs.databinding.ActivityMainBinding
 import sushi.hardcore.droidfs.databinding.DialogDeleteVolumeBinding
-import sushi.hardcore.droidfs.databinding.DialogOpenVolumeBinding
+import sushi.hardcore.droidfs.explorers.ExplorerRouter
-import sushi.hardcore.droidfs.explorers.ExplorerActivity
-import sushi.hardcore.droidfs.explorers.ExplorerActivityDrop
-import sushi.hardcore.droidfs.explorers.ExplorerActivityPick
 import sushi.hardcore.droidfs.file_operations.FileOperationService
+import sushi.hardcore.droidfs.file_operations.TaskResult
+import sushi.hardcore.droidfs.util.IntentUtils
 import sushi.hardcore.droidfs.util.PathUtils
+import sushi.hardcore.droidfs.util.UIUtils
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import sushi.hardcore.droidfs.widgets.EditTextDialog
 import java.io.File
-import java.util.*
 
 class MainActivity : BaseActivity(), VolumeAdapter.Listener {
-
     companion object {
-        const val DEFAULT_VOLUME_KEY = "default_volume"
+        private const val OPEN_DEFAULT_VOLUME = "openDefault"
     }
 
     private lateinit var binding: ActivityMainBinding
     private lateinit var volumeDatabase: VolumeDatabase
+    private lateinit var volumeManager: VolumeManager
     private lateinit var volumeAdapter: VolumeAdapter
-    private var fingerprintProtector: FingerprintProtector? = null
+    private lateinit var volumeOpener: VolumeOpener
-    private var usfFingerprint: Boolean = false
-    private var usfKeepOpen: Boolean = false
-    private var defaultVolumeName: String? = null
     private var addVolume = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
-        when (result.resultCode) {
+        if ((explorerRouter.pickMode || explorerRouter.dropMode) && result.resultCode != AddVolumeActivity.RESULT_USER_BACK) {
-            AddVolumeActivity.RESULT_VOLUME_ADDED -> onVolumeAdded()
+            setResult(result.resultCode, result.data) // forward result
-            AddVolumeActivity.RESULT_HASH_STORAGE_RESET -> {
+            finish()
-                volumeAdapter.refresh()
-                binding.textNoVolumes.visibility = View.GONE
-            }
         }
     }
-    private var changePasswordPosition: Int? = null
+    private var selectedVolumePosition: Int? = null
     private var changePassword = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) {
-        changePasswordPosition?.let { unselect(it) }
+        selectedVolumePosition?.let { unselect(it) }
     }
     private val pickDirectory = registerForActivityResult(ActivityResultContracts.OpenDocumentTree()) { uri ->
         if (uri != null)
             onDirectoryPicked(uri)
     }
     private lateinit var fileOperationService: FileOperationService
-    private var pickMode = false
+    private lateinit var explorerRouter: ExplorerRouter
-    private var dropMode = false
-    private var shouldCloseVolume = true // used when launched to pick file from another volume
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         binding = ActivityMainBinding.inflate(layoutInflater)
         setContentView(binding.root)
         if (sharedPrefs.getBoolean("applicationFirstOpening", true)) {
-            CustomAlertDialogBuilder(this, themeValue)
+            CustomAlertDialogBuilder(this, theme)
                 .setTitle(R.string.warning)
                 .setMessage(R.string.usf_home_warning_msg)
                 .setCancelable(false)
@@ -94,14 +83,15 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
                 }
                 .show()
         }
-        pickMode = intent.action == "pick"
+        explorerRouter = ExplorerRouter(this, intent)
-        dropMode = (intent.action == Intent.ACTION_SEND || intent.action == Intent.ACTION_SEND_MULTIPLE) && intent.extras != null
+        volumeManager = (application as VolumeManagerApp).volumeManager
         volumeDatabase = VolumeDatabase(this)
         volumeAdapter = VolumeAdapter(
             this,
             volumeDatabase,
-            !pickMode && !dropMode,
+            (application as VolumeManagerApp).volumeManager,
-            !dropMode,
+            !explorerRouter.pickMode && !explorerRouter.dropMode,
+            !explorerRouter.dropMode,
             this,
         )
         binding.recyclerViewVolumes.adapter = volumeAdapter
@@ -109,28 +99,39 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
         if (volumeAdapter.volumes.isEmpty()) {
             binding.textNoVolumes.visibility = View.VISIBLE
         }
-        if (pickMode) {
+        if (explorerRouter.pickMode) {
             title = getString(R.string.select_volume)
-            binding.fab.visibility = View.GONE
+        }
-        } else {
+        binding.fab.setOnClickListener {
-            binding.fab.setOnClickListener {
+            addVolume.launch(Intent(this, AddVolumeActivity::class.java).also {
-                addVolume.launch(Intent(this, AddVolumeActivity::class.java))
+                if (explorerRouter.dropMode || explorerRouter.pickMode) {
+                    IntentUtils.forwardIntent(intent, it)
+                }
+            })
+        }
+        volumeOpener = VolumeOpener(this)
+        onBackPressedDispatcher.addCallback(this) {
+            if (volumeAdapter.selectedItems.isNotEmpty()) {
+                unselectAll()
+            } else {
+                isEnabled = false
+                onBackPressedDispatcher.onBackPressed()
             }
         }
-        usfKeepOpen = sharedPrefs.getBoolean("usf_keep_open", false)
+        volumeOpener.defaultVolumeName?.let { name ->
-        usfFingerprint = sharedPrefs.getBoolean("usf_fingerprint", false)
+            val state = savedInstanceState?.getBoolean(OPEN_DEFAULT_VOLUME)
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+            if (state == true || state == null) {
-            fingerprintProtector = FingerprintProtector.new(this, themeValue, volumeDatabase)
+                try {
-        }
+                    val volumeData = volumeAdapter.volumes.first { it.name == name }
-        defaultVolumeName = sharedPrefs.getString(DEFAULT_VOLUME_KEY, null)
+                    if (!volumeManager.isOpen(volumeData)) {
-        defaultVolumeName?.let { name ->
+                        openVolume(volumeData)
-            try {
+                    }
-                val (position, volume) = volumeAdapter.volumes.withIndex().first { it.value.name == name }
+                } catch (e: NoSuchElementException) {
-                openVolume(volume, position)
+                    unsetDefaultVolume()
-            } catch (e: NoSuchElementException) {
+                }
-                unsetDefaultVolume()
             }
         }
+        startService(Intent(this, WiperService::class.java))
         Intent(this, FileOperationService::class.java).also {
             bindService(it, object : ServiceConnection {
                 override fun onServiceConnected(className: ComponentName, service: IBinder) {
@@ -143,8 +144,24 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
 
     override fun onStart() {
         super.onStart()
-        // refresh this in case another instance of MainActivity changes its value
+        // check if theme was changed (by SettingsActivity)
-        defaultVolumeName = sharedPrefs.getString(DEFAULT_VOLUME_KEY, null)
+        val newTheme = Theme.fromSharedPrefs(sharedPrefs)
+        if (newTheme != theme) {
+            recreate()
+        } else {
+            volumeAdapter.refresh()
+            invalidateOptionsMenu()
+            if (volumeAdapter.volumes.isNotEmpty()) {
+                binding.textNoVolumes.visibility = View.GONE
+            }
+            // refresh this in case another instance of MainActivity changes its value
+            volumeOpener.defaultVolumeName = sharedPrefs.getString(DEFAULT_VOLUME_KEY, null)
+        }
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        outState.putBoolean(OPEN_DEFAULT_VOLUME, false)
     }
 
     override fun onSelectionChanged(size: Int) {
@@ -155,9 +172,9 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
         }
     }
 
-    override fun onVolumeItemClick(volume: Volume, position: Int) {
+    override fun onVolumeItemClick(volume: VolumeData, position: Int) {
         if (volumeAdapter.selectedItems.isEmpty())
-            openVolume(volume, position)
+            openVolume(volume)
         else
             invalidateOptionsMenu()
     }
@@ -166,14 +183,6 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
         invalidateOptionsMenu()
     }
 
-    private fun onVolumeAdded() {
-        volumeAdapter.apply {
-            volumes = volumeDatabase.getVolumes()
-            notifyItemInserted(volumes.size)
-        }
-        binding.textNoVolumes.visibility = View.GONE
-    }
-
     private fun unselectAll(notifyChange: Boolean = true) {
         volumeAdapter.unSelectAll(notifyChange)
         invalidateOptionsMenu()
@@ -186,7 +195,12 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
         invalidateOptionsMenu()
     }
 
-    private fun removeVolumes(volumes: List<Volume>, i: Int = 0, doDeleteVolumeContent: Boolean? = null) {
+    private fun removeVolume(volume: VolumeData) {
+        volumeManager.getVolumeId(volume)?.let { volumeManager.closeVolume(it) }
+        volumeDatabase.removeVolume(volume)
+    }
+
+    private fun removeVolumes(volumes: List<VolumeData>, i: Int = 0, doDeleteVolumeContent: Boolean? = null) {
         if (i < volumes.size) {
             if (volumes[i].isHidden) {
                 if (doDeleteVolumeContent == null) {
@@ -199,16 +213,16 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
                             break
                         }
                     }
-                    CustomAlertDialogBuilder(this, themeValue)
+                    CustomAlertDialogBuilder(this, theme)
                         .setTitle(R.string.warning)
                         .setView(dialogBinding.root)
                         .setPositiveButton(R.string.forget_only) { _, _ ->
-                            volumeDatabase.removeVolume(volumes[i].name)
+                            removeVolume(volumes[i])
                             removeVolumes(volumes, i + 1, if (dialogBinding.checkboxApplyToAll.isChecked) false else null)
                         }
                         .setNegativeButton(R.string.delete_volume) { _, _ ->
                             PathUtils.recursiveRemoveDirectory(File(volumes[i].getFullPath(filesDir.path)))
-                            volumeDatabase.removeVolume(volumes[i].name)
+                            removeVolume(volumes[i])
                             removeVolumes(volumes, i + 1, if (dialogBinding.checkboxApplyToAll.isChecked) true else null)
                         }
                         .setOnCancelListener {
@@ -220,11 +234,11 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
                     if (doDeleteVolumeContent) {
                         PathUtils.recursiveRemoveDirectory(File(volumes[i].getFullPath(filesDir.path)))
                     }
-                    volumeDatabase.removeVolume(volumes[i].name)
+                    removeVolume(volumes[i])
                     removeVolumes(volumes, i + 1, doDeleteVolumeContent)
                 }
             } else {
-                volumeDatabase.removeVolume(volumes[i].name)
+                removeVolume(volumes[i])
                 removeVolumes(volumes, i + 1, doDeleteVolumeContent)
             }
         } else {
@@ -241,15 +255,13 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
             remove(DEFAULT_VOLUME_KEY)
             apply()
         }
-        defaultVolumeName = null
+        volumeOpener.defaultVolumeName = null
     }
 
     override fun onOptionsItemSelected(item: MenuItem): Boolean {
         return when (item.itemId) {
             android.R.id.home -> {
-                if (pickMode || dropMode) {
+                if (explorerRouter.pickMode || explorerRouter.dropMode) {
-                    if (pickMode)
-                        shouldCloseVolume = false
                     finish()
                 } else {
                     unselectAll()
@@ -261,12 +273,21 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
                 invalidateOptionsMenu()
                 true
             }
+            R.id.lock -> {
+                volumeAdapter.selectedItems.forEach {
+                    volumeManager.getVolumeId(volumeAdapter.volumes[it])?.let { id ->
+                        volumeManager.closeVolume(id)
+                    }
+                }
+                unselectAll()
+                true
+            }
             R.id.remove -> {
                 val selectedVolumes = volumeAdapter.selectedItems.map { i -> volumeAdapter.volumes[i] }
                 removeVolumes(selectedVolumes)
                 true
             }
-            R.id.forget_password -> {
+            R.id.delete_password_hash -> {
                 for (i in volumeAdapter.selectedItems) {
                     if (volumeDatabase.removeHash(volumeAdapter.volumes[i]))
                         volumeAdapter.onVolumeChanged(i)
@@ -275,9 +296,9 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
                 true
             }
             R.id.change_password -> {
-                changePasswordPosition = volumeAdapter.selectedItems.elementAt(0)
+                selectedVolumePosition = volumeAdapter.selectedItems.elementAt(0)
                 changePassword.launch(Intent(this, ChangePasswordActivity::class.java).apply {
-                    putExtra("volume", volumeAdapter.volumes[changePasswordPosition!!])
+                    putExtra("volume", volumeAdapter.volumes[selectedVolumePosition!!])
                 })
                 true
             }
@@ -287,26 +308,32 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
                 true
             }
             R.id.copy -> {
-                val position = volumeAdapter.selectedItems.elementAt(0)
+                selectedVolumePosition = volumeAdapter.selectedItems.elementAt(0)
-                val volume = volumeAdapter.volumes[position]
+                val volume = volumeAdapter.volumes[selectedVolumePosition!!]
-                when {
+                if (volume.isHidden) {
-                    volume.isHidden -> {
+                    PathUtils.safePickDirectory(pickDirectory, this, theme)
-                        PathUtils.safePickDirectory(pickDirectory, this, themeValue)
+                } else {
-                    }
+                    val hiddenVolumeFile = File(VolumeData.getHiddenVolumeFullPath(filesDir.path, volume.shortName))
-                    File(filesDir, volume.shortName).exists() -> {
+                    if (hiddenVolumeFile.exists()) {
-                        CustomAlertDialogBuilder(this, themeValue)
+                        CustomAlertDialogBuilder(this, theme)
                             .setTitle(R.string.error)
                             .setMessage(R.string.hidden_volume_already_exists)
                             .setPositiveButton(R.string.ok, null)
                             .show()
-                    }
+                    } else {
-                    else -> {
+                        unselect(selectedVolumePosition!!)
-                        unselect(position)
                         copyVolume(
                             DocumentFile.fromFile(File(volume.name)),
-                            DocumentFile.fromFile(filesDir),
+                            DocumentFile.fromFile(hiddenVolumeFile.parentFile!!),
                         ) {
-                            Volume(volume.shortName, true, volume.encryptedHash, volume.iv)
+                            VolumeData(
+                                VolumeData.newUuid(),
+                                volume.shortName,
+                                true,
+                                volume.type,
+                                volume.encryptedHash,
+                                volume.iv
+                            )
                         }
                     }
                 }
@@ -328,11 +355,18 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
 
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
         menuInflater.inflate(R.menu.main_activity, menu)
-        menu.findItem(R.id.settings).isVisible = !pickMode && !dropMode
+        val settingsVisible = !explorerRouter.pickMode && !explorerRouter.dropMode
+        menu.findItem(R.id.settings).isVisible = settingsVisible
+        if (settingsVisible) {
+            UIUtils.getMenuIconNeutralTint(this, menu).applyTo(R.id.settings, R.drawable.icon_settings)
+        }
         val isSelecting = volumeAdapter.selectedItems.isNotEmpty()
         menu.findItem(R.id.select_all).isVisible = isSelecting
+        menu.findItem(R.id.lock).isVisible = isSelecting && volumeAdapter.selectedItems.any {
+            i -> volumeManager.isOpen(volumeAdapter.volumes[i])
+        }
         menu.findItem(R.id.remove).isVisible = isSelecting
-        menu.findItem(R.id.forget_password).isVisible =
+        menu.findItem(R.id.delete_password_hash).isVisible =
             isSelecting &&
             !volumeAdapter.selectedItems.any { i -> volumeAdapter.volumes[i].encryptedHash == null }
         val onlyOneSelected = volumeAdapter.selectedItems.size == 1
@@ -342,7 +376,7 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
         menu.findItem(R.id.change_password).isVisible = onlyOneAndWriteable
         menu.findItem(R.id.remove_default_open).isVisible =
             onlyOneSelected &&
-            volumeAdapter.volumes[volumeAdapter.selectedItems.first()].name == defaultVolumeName
+            volumeAdapter.volumes[volumeAdapter.selectedItems.first()].name == volumeOpener.defaultVolumeName
         with(menu.findItem(R.id.copy)) {
             isVisible = onlyOneSelected
             if (isVisible) {
@@ -353,18 +387,17 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
                 )
             }
         }
-        menu.findItem(R.id.rename).isVisible = onlyOneAndWriteable
+        menu.findItem(R.id.rename).isVisible = onlyOneAndWriteable && !volumeManager.isOpen(volumeAdapter.volumes[volumeAdapter.selectedItems.first()])
-        supportActionBar?.setDisplayHomeAsUpEnabled(isSelecting || pickMode || dropMode)
+        supportActionBar?.setDisplayHomeAsUpEnabled(isSelecting || explorerRouter.pickMode || explorerRouter.dropMode)
         return true
     }
 
     private fun onDirectoryPicked(uri: Uri) {
-        val position = volumeAdapter.selectedItems.elementAt(0)
+        val volume = volumeAdapter.volumes[selectedVolumePosition!!]
-        val volume = volumeAdapter.volumes[position]
+        unselect(selectedVolumePosition!!)
-        unselect(position)
         val dstDocumentFile = DocumentFile.fromTreeUri(this, uri)
         if (dstDocumentFile == null) {
-            CustomAlertDialogBuilder(this, themeValue)
+            CustomAlertDialogBuilder(this, theme)
                 .setTitle(R.string.error)
                 .setMessage(R.string.path_error)
                 .setPositiveButton(R.string.ok, null)
@@ -377,9 +410,11 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
                 dstRootDirectory.name?.let { name ->
                     val path = PathUtils.getFullPathFromTreeUri(dstRootDirectory.uri, this)
                     if (path == null) null
-                    else Volume(
+                    else VolumeData(
+                        VolumeData.newUuid(),
                         PathUtils.pathJoin(path, name),
                         false,
+                        volume.type,
                         volume.encryptedHash,
                         volume.iv
                     )
@@ -388,40 +423,52 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
         }
     }
 
-    private fun copyVolume(srcDocumentFile: DocumentFile, dstDocumentFile: DocumentFile, getResultVolume: (DocumentFile) -> Volume?) {
+    /**
+     * Copy a volume.
+     *
+     * @param srcDocumentFile [DocumentFile] of the volume to copy
+     * @param dstDocumentFile [DocumentFile] of the destination PARENT FOLDER
+     * @param getResultVolume A function that returns the [VolumeData] corresponding to the destination volume. Takes the [DocumentFile] of the newly created volume (not the parent folder).
+     */
+    private fun copyVolume(srcDocumentFile: DocumentFile, dstDocumentFile: DocumentFile, getResultVolume: (DocumentFile) -> VolumeData?) {
         lifecycleScope.launch {
             val result = fileOperationService.copyVolume(srcDocumentFile, dstDocumentFile)
-            when {
+            when (result.taskResult.state) {
-                result.taskResult.cancelled -> {
+                TaskResult.State.CANCELLED -> {
                     result.dstRootDirectory?.delete()
                 }
-                result.taskResult.failedItem == null -> {
+                TaskResult.State.SUCCESS -> {
                     result.dstRootDirectory?.let {
                         getResultVolume(it)?.let { volume ->
                             volumeDatabase.saveVolume(volume)
-                            onVolumeAdded()
+                            volumeAdapter.apply {
+                                volumes = volumeDatabase.getVolumes()
+                                notifyItemInserted(volumes.size)
+                            }
+                            binding.textNoVolumes.visibility = View.GONE
                             Toast.makeText(this@MainActivity, R.string.copy_success, Toast.LENGTH_SHORT).show()
                         }
                     }
                 }
-                else -> {
+                TaskResult.State.FAILED -> {
-                    CustomAlertDialogBuilder(this@MainActivity, themeValue)
+                    CustomAlertDialogBuilder(this@MainActivity, theme)
                         .setTitle(R.string.error)
-                        .setMessage(getString(R.string.copy_failed, result.taskResult.failedItem.name))
+                        .setMessage(getString(R.string.copy_failed, result.taskResult.failedItem!!.name))
                         .setPositiveButton(R.string.ok, null)
                         .show()
                 }
+                TaskResult.State.ERROR -> result.taskResult.showErrorAlertDialog(this@MainActivity, theme)
             }
         }
     }
 
-    private fun renameVolume(volume: Volume, position: Int) {
+    private fun renameVolume(volume: VolumeData, position: Int) {
         with (EditTextDialog(this, R.string.new_volume_name) { newName ->
             val srcPath = File(volume.getFullPath(filesDir.path))
             val dstPath = File(srcPath.parent, newName).canonicalFile
             val newDBName: String
             val success = if (volume.isHidden) {
-                if (newName.contains("/")) {
+                if (newName.contains(PathUtils.SEPARATOR)) {
                     Toast.makeText(this, R.string.error_slash_in_name, Toast.LENGTH_SHORT).show()
                     renameVolume(volume, position)
                     return@EditTextDialog
@@ -433,14 +480,15 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
                 DocumentFile.fromFile(srcPath).renameTo(newName)
             }
             if (success) {
-                volumeDatabase.renameVolume(volume.name, newDBName)
+                volumeDatabase.renameVolume(volume, newDBName)
+                VolumeProvider.notifyRootsChanged(this)
                 unselect(position)
-                if (volume.name == defaultVolumeName) {
+                if (volume.name == volumeOpener.defaultVolumeName) {
                     with (sharedPrefs.edit()) {
                         putString(DEFAULT_VOLUME_KEY, newDBName)
                         apply()
                     }
-                    defaultVolumeName = newDBName
+                    volumeOpener.defaultVolumeName = newDBName
                 }
             } else {
                 Toast.makeText(this, R.string.volume_rename_failed, Toast.LENGTH_SHORT).show()
@@ -451,201 +499,23 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
         }
     }
 
-    @SuppressLint("NewApi") // fingerprintProtector is non-null only when SDK_INT >= 23
+    private fun openVolume(volume: VolumeData) {
-    private fun openVolume(volume: Volume, position: Int) {
+        volumeOpener.openVolume(volume, true, object : VolumeOpener.VolumeOpenerCallbacks {
-        var askForPassword = true
+            override fun onHashStorageReset() {
-        fingerprintProtector?.let { fingerprintProtector ->
+                volumeAdapter.refresh()
-            volume.encryptedHash?.let { encryptedHash ->
+            }
-                volume.iv?.let { iv ->
+
-                    askForPassword = false
+            override fun onVolumeOpened(id: Int) {
-                    fingerprintProtector.listener = object : FingerprintProtector.Listener {
+                startActivity(explorerRouter.getExplorerIntent(id, volume.shortName))
-                        override fun onHashStorageReset() {
+                if (explorerRouter.dropMode || explorerRouter.pickMode) {
-                            volumeAdapter.refresh()
+                    finish()
-                        }
-                        override fun onPasswordHashDecrypted(hash: ByteArray) {
-                            object : LoadingTask<Int>(this@MainActivity, themeValue, R.string.loading_msg_open) {
-                                override suspend fun doTask(): Int {
-                                    val sessionId = GocryptfsVolume.init(volume.getFullPath(filesDir.path), null, hash, null)
-                                    Arrays.fill(hash, 0)
-                                    return sessionId
-                                }
-                            }.startTask(lifecycleScope) { sessionId ->
-                                if (sessionId != -1) {
-                                    startExplorer(sessionId, volume.shortName)
-                                } else {
-                                    CustomAlertDialogBuilder(this@MainActivity, themeValue)
-                                        .setTitle(R.string.open_volume_failed)
-                                        .setMessage(R.string.open_failed_hash_msg)
-                                        .setPositiveButton(R.string.ok, null)
-                                        .show()
-                                }
-                            }
-                        }
-                        override fun onPasswordHashSaved() {}
-                        override fun onFailed(pending: Boolean) {
-                            if (!pending) {
-                                askForPassword(volume, position)
-                            }
-                        }
-                    }
-                    fingerprintProtector.loadPasswordHash(volume.shortName, encryptedHash, iv)
                 }
             }
-        }
+        })
-        if (askForPassword)
-            askForPassword(volume, position)
-    }
-
-    private fun onPasswordSubmitted(volume: Volume, position: Int, dialogBinding: DialogOpenVolumeBinding) {
-        if (dialogBinding.checkboxDefaultOpen.isChecked xor (defaultVolumeName == volume.name)) {
-            with (sharedPrefs.edit()) {
-                defaultVolumeName = if (dialogBinding.checkboxDefaultOpen.isChecked) {
-                    putString(DEFAULT_VOLUME_KEY, volume.name)
-                    volume.name
-                } else {
-                    remove(DEFAULT_VOLUME_KEY)
-                    null
-                }
-                apply()
-            }
-        }
-        val password = CharArray(dialogBinding.editPassword.text.length)
-        dialogBinding.editPassword.text.getChars(0, password.size, password, 0)
-        // openVolumeWithPassword is responsible for wiping the password
-        openVolumeWithPassword(
-            volume,
-            position,
-            password,
-            dialogBinding.checkboxSavePassword.isChecked,
-        )
-    }
-
-    private fun askForPassword(volume: Volume, position: Int, savePasswordHash: Boolean = false) {
-        val dialogBinding = DialogOpenVolumeBinding.inflate(layoutInflater)
-        if (!usfFingerprint || fingerprintProtector == null || volume.encryptedHash != null) {
-            dialogBinding.checkboxSavePassword.visibility = View.GONE
-        } else {
-            dialogBinding.checkboxSavePassword.isChecked = savePasswordHash
-        }
-        dialogBinding.checkboxDefaultOpen.isChecked = defaultVolumeName == volume.name
-        val dialog = CustomAlertDialogBuilder(this, themeValue)
-            .setTitle(getString(R.string.open_dialog_title, volume.shortName))
-            .setView(dialogBinding.root)
-            .setNegativeButton(R.string.cancel, null)
-            .setPositiveButton(R.string.open) { _, _ ->
-                onPasswordSubmitted(volume, position, dialogBinding)
-            }
-            .create()
-        dialogBinding.editPassword.apply {
-            setOnEditorActionListener { _, _, _ ->
-                dialog.dismiss()
-                onPasswordSubmitted(volume, position, dialogBinding)
-                true
-            }
-            if (sharedPrefs.getBoolean(ConstValues.PIN_PASSWORDS_KEY, false)) {
-                inputType = InputType.TYPE_CLASS_NUMBER or InputType.TYPE_NUMBER_VARIATION_PASSWORD
-            }
-        }
-        dialog.window?.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE)
-        dialog.show()
-    }
-
-    private fun openVolumeWithPassword(volume: Volume, position: Int, password: CharArray, savePasswordHash: Boolean) {
-        val usfFingerprint = sharedPrefs.getBoolean("usf_fingerprint", false)
-        var returnedHash: ByteArray? = null
-        if (savePasswordHash && usfFingerprint) {
-            returnedHash = ByteArray(GocryptfsVolume.KeyLen)
-        }
-        object : LoadingTask<Int>(this, themeValue, R.string.loading_msg_open) {
-            override suspend fun doTask(): Int {
-                val sessionId = GocryptfsVolume.init(volume.getFullPath(filesDir.path), password, null, returnedHash)
-                Arrays.fill(password, 0.toChar())
-                return sessionId
-            }
-        }.startTask(lifecycleScope) { sessionId ->
-            if (sessionId != -1) {
-                val fingerprintProtector = fingerprintProtector
-                @SuppressLint("NewApi") // fingerprintProtector is non-null only when SDK_INT >= 23
-                if (savePasswordHash && returnedHash != null && fingerprintProtector != null) {
-                    fingerprintProtector.listener = object : FingerprintProtector.Listener {
-                        override fun onHashStorageReset() {
-                            volumeAdapter.refresh()
-                        }
-                        override fun onPasswordHashDecrypted(hash: ByteArray) {}
-                        override fun onPasswordHashSaved() {
-                            Arrays.fill(returnedHash, 0)
-                            volumeAdapter.onVolumeChanged(position)
-                            startExplorer(sessionId, volume.shortName)
-                        }
-                        private var isClosed = false
-                        override fun onFailed(pending: Boolean) {
-                            if (!isClosed) {
-                                GocryptfsVolume(this@MainActivity, sessionId).close()
-                                isClosed = true
-                            }
-                            Arrays.fill(returnedHash, 0)
-                        }
-                    }
-                    fingerprintProtector.savePasswordHash(volume, returnedHash)
-                } else {
-                    startExplorer(sessionId, volume.shortName)
-                }
-            } else {
-                CustomAlertDialogBuilder(this, themeValue)
-                    .setTitle(R.string.open_volume_failed)
-                    .setMessage(R.string.open_volume_failed_msg)
-                    .setPositiveButton(R.string.ok) { _, _ ->
-                        askForPassword(volume, position, savePasswordHash)
-                    }
-                    .show()
-            }
-        }
-    }
-
-    private fun startExplorer(sessionId: Int, volumeShortName: String) {
-        var explorerIntent: Intent? = null
-        if (dropMode) { //import via android share menu
-            explorerIntent = Intent(this, ExplorerActivityDrop::class.java)
-            explorerIntent.action = intent.action //forward action
-            explorerIntent.putExtras(intent.extras!!) //forward extras
-        } else if (pickMode) {
-            explorerIntent = Intent(this, ExplorerActivityPick::class.java)
-            explorerIntent.putExtra("originalSessionID", intent.getIntExtra("sessionID", -1))
-            explorerIntent.flags = Intent.FLAG_ACTIVITY_FORWARD_RESULT
-        }
-        if (explorerIntent == null) {
-            explorerIntent = Intent(this, ExplorerActivity::class.java) //default opening
-        }
-        explorerIntent.putExtra("sessionID", sessionId)
-        explorerIntent.putExtra("volume_name", volumeShortName)
-        startActivity(explorerIntent)
-        if (pickMode)
-            shouldCloseVolume = false
-        if (dropMode || pickMode)
-            finish()
-    }
-
-    override fun onBackPressed() {
-        if (volumeAdapter.selectedItems.isNotEmpty()) {
-            unselectAll()
-        } else {
-            if (pickMode)
-                shouldCloseVolume = false
-            super.onBackPressed()
-        }
     }
 
     override fun onStop() {
         super.onStop()
-        if (pickMode && !usfKeepOpen) {
+        volumeOpener.wipeSensitive()
-            finish()
-            if (shouldCloseVolume) {
-                val sessionID = intent.getIntExtra("sessionID", -1)
-                if (sessionID != -1) {
-                    GocryptfsVolume(this, sessionID).close()
-                    RestrictedFileProvider.wipeAll(this)
-                }
-            }
-        }
     }
 }

app/src/main/java/sushi/hardcore/droidfs/MemFile.kt

@@ -0,0 +1,22 @@
+package sushi.hardcore.droidfs
+
+import android.os.ParcelFileDescriptor
+import android.system.Os
+
+class MemFile private constructor(private val fd: Int) {
+    companion object {
+        private external fun createMemFile(name: String, size: Long): Int
+        init {
+            System.loadLibrary("memfile")
+        }
+
+        fun create(name: String, size: Long): MemFile? {
+            val fd = createMemFile(name, size)
+            return if (fd > 0) MemFile(fd) else null
+        }
+    }
+
+    fun dup(): ParcelFileDescriptor = ParcelFileDescriptor.fromFd(fd)
+    fun toParcelFileDescriptor(): ParcelFileDescriptor = ParcelFileDescriptor.adoptFd(fd)
+    fun close() = Os.close(ParcelFileDescriptor.adoptFd(fd).fileDescriptor)
+}

app/src/main/java/sushi/hardcore/droidfs/SettingsActivity.kt

@@ -1,13 +1,22 @@
 package sushi.hardcore.droidfs
 
+import android.content.Intent
 import android.content.SharedPreferences
 import android.os.Build
 import android.os.Bundle
 import android.text.InputType
 import android.view.MenuItem
 import android.widget.Toast
-import androidx.preference.*
+import androidx.preference.ListPreference
+import androidx.preference.Preference
+import androidx.preference.PreferenceFragmentCompat
+import androidx.preference.PreferenceManager
+import androidx.preference.SwitchPreference
+import androidx.preference.SwitchPreferenceCompat
+import sushi.hardcore.droidfs.content_providers.TemporaryFileProvider
+import sushi.hardcore.droidfs.content_providers.VolumeProvider
 import sushi.hardcore.droidfs.databinding.ActivitySettingsBinding
+import sushi.hardcore.droidfs.util.Compat
 import sushi.hardcore.droidfs.util.PathUtils
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import sushi.hardcore.droidfs.widgets.EditTextDialog
@@ -34,7 +43,7 @@ class SettingsActivity : BaseActivity() {
     override fun onOptionsItemSelected(item: MenuItem): Boolean {
         return when (item.itemId){
             android.R.id.home -> {
-                onBackPressed() //return to the previous fragment rather than the activity
+                onBackPressedDispatcher.onBackPressed() //return to the previous fragment rather than the activity
                 true
             }
             else -> super.onOptionsItemSelected(item)
@@ -60,7 +69,7 @@ class SettingsActivity : BaseActivity() {
                 showMaxSizeDialog()
             } else {
                 with(sharedPrefs.edit()) {
-                    putLong(ConstValues.THUMBNAIL_MAX_SIZE_KEY, value)
+                    putLong(Constants.THUMBNAIL_MAX_SIZE_KEY, value)
                     apply()
                 }
                 maxSizePreference.summary = PathUtils.formatSize(size)
@@ -79,19 +88,31 @@ class SettingsActivity : BaseActivity() {
             }
         }
 
+        private fun refreshTheme() {
+            with(requireActivity()) {
+                startActivity(Intent(this, SettingsActivity::class.java))
+                finish()
+                overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out)
+            }
+        }
+
         override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
             setPreferencesFromResource(R.xml.root_preferences, rootKey)
             sharedPrefs = PreferenceManager.getDefaultSharedPreferences(requireContext())
-            findPreference<ListPreference>("theme")?.setOnPreferenceChangeListener { _, newValue ->
+            findPreference<ListPreference>("color")?.setOnPreferenceChangeListener { _, _ ->
-                (activity as BaseActivity).onThemeChanged(newValue as String)
+                refreshTheme()
                 true
             }
-            findPreference<Preference>(ConstValues.THUMBNAIL_MAX_SIZE_KEY)?.let {
+            findPreference<SwitchPreferenceCompat>("black_theme")?.setOnPreferenceChangeListener { _, _ ->
+                refreshTheme()
+                true
+            }
+            findPreference<Preference>(Constants.THUMBNAIL_MAX_SIZE_KEY)?.let {
                 maxSizePreference = it
                 maxSizePreference.summary = getString(
                     R.string.thumbnail_max_size_summary,
                     PathUtils.formatSize(sharedPrefs.getLong(
-                        ConstValues.THUMBNAIL_MAX_SIZE_KEY, ConstValues.DEFAULT_THUMBNAIL_MAX_SIZE
+                        Constants.THUMBNAIL_MAX_SIZE_KEY, Constants.DEFAULT_THUMBNAIL_MAX_SIZE
                     )*1000)
                 )
                 maxSizePreference.setOnPreferenceClickListener {
@@ -99,6 +120,10 @@ class SettingsActivity : BaseActivity() {
                     false
                 }
             }
+            findPreference<Preference>("logcat")?.setOnPreferenceClickListener { _ ->
+                startActivity(Intent(requireContext(), LogcatActivity::class.java))
+                true
+            }
         }
     }
 
@@ -126,7 +151,7 @@ class SettingsActivity : BaseActivity() {
                     if (errorMsg == null) {
                         true
                     } else {
-                        CustomAlertDialogBuilder(requireContext(), (requireActivity() as BaseActivity).themeValue)
+                        CustomAlertDialogBuilder(requireContext(), (requireActivity() as BaseActivity).theme)
                             .setTitle(R.string.error)
                             .setMessage(errorMsg)
                             .setPositiveButton(R.string.ok, null)
@@ -137,6 +162,50 @@ class SettingsActivity : BaseActivity() {
                     true
                 }
             }
+            val switchKeepOpen = findPreference<SwitchPreference>("usf_keep_open")!!
+            val switchExternalOpen = findPreference<SwitchPreference>("usf_open")!!
+            val switchExpose = findPreference<SwitchPreference>("usf_expose")!!
+            val switchSafWrite = findPreference<SwitchPreference>("usf_saf_write")!!
+
+            fun updateView(usfOpen: Boolean? = null, usfKeepOpen: Boolean? = null, usfExpose: Boolean? = null) {
+                val usfKeepOpen = usfKeepOpen ?: switchKeepOpen.isChecked
+                switchExpose.isEnabled = usfKeepOpen
+                switchSafWrite.isEnabled = usfOpen ?: switchExternalOpen.isChecked || (usfKeepOpen && usfExpose ?: switchExpose.isChecked)
+            }
+
+            updateView()
+            switchKeepOpen.setOnPreferenceChangeListener { _, checked ->
+                updateView(usfKeepOpen = checked as Boolean)
+                true
+            }
+            switchExternalOpen.setOnPreferenceChangeListener { _, checked ->
+                updateView(usfOpen = checked as Boolean)
+                true
+            }
+            switchExpose.setOnPreferenceChangeListener { _, checked ->
+                VolumeProvider.usfExpose = checked as Boolean
+                updateView(usfExpose = checked)
+                VolumeProvider.notifyRootsChanged(requireContext())
+                true
+            }
+            switchSafWrite.setOnPreferenceChangeListener { _, checked ->
+                VolumeProvider.usfSafWrite = checked as Boolean
+                TemporaryFileProvider.usfSafWrite = checked
+                true
+            }
+
+            findPreference<ListPreference>("export_method")!!.setOnPreferenceChangeListener { _, newValue ->
+                if (newValue as String == "memory" && !Compat.isMemFileSupported()) {
+                    CustomAlertDialogBuilder(requireContext(), (requireActivity() as BaseActivity).theme)
+                        .setTitle(R.string.error)
+                        .setMessage(getString(R.string.memfd_create_unsupported, Compat.MEMFD_CREATE_MINIMUM_KERNEL_VERSION))
+                        .setPositiveButton(R.string.ok, null)
+                        .show()
+                    return@setOnPreferenceChangeListener false
+                }
+                EncryptedFileProvider.exportMethod = EncryptedFileProvider.ExportMethod.parse(newValue)
+                true
+            }
         }
     }
 }

app/src/main/java/sushi/hardcore/droidfs/Theme.kt

@@ -0,0 +1,68 @@
+package sushi.hardcore.droidfs
+
+import android.content.SharedPreferences
+import android.os.Parcel
+import android.os.Parcelable
+
+class Theme(var color: String, var black: Boolean) : Parcelable {
+
+    constructor(parcel: Parcel) : this(
+        parcel.readString()!!,
+        parcel.readByte() != 0.toByte(),
+    )
+
+    fun toResourceId(): Int {
+        return if (black) {
+            when (color) {
+                "red" -> R.style.BlackRed
+                "blue" -> R.style.BlackBlue
+                "yellow" -> R.style.BlackYellow
+                "orange" -> R.style.BlackOrange
+                "purple" -> R.style.BlackPurple
+                "pink" -> R.style.BlackPink
+                else -> R.style.BlackGreen
+            }
+        } else {
+            when (color) {
+                "red" -> R.style.DarkRed
+                "blue" -> R.style.DarkBlue
+                "yellow" -> R.style.DarkYellow
+                "orange" -> R.style.DarkOrange
+                "purple" -> R.style.DarkPurple
+                "pink" -> R.style.DarkPink
+                else -> R.style.BaseTheme
+            }
+        }
+    }
+
+    override fun equals(other: Any?): Boolean {
+        if (other !is Theme) {
+            return false
+        }
+        return other.color == color && other.black == black
+    }
+
+    override fun describeContents(): Int = 0
+
+    override fun writeToParcel(dest: Parcel, flags: Int) {
+        with(dest) {
+            writeString(color)
+            writeByte(if (black) 1 else 0)
+        }
+    }
+
+
+    companion object {
+        @JvmField
+        val CREATOR = object : Parcelable.Creator<Theme> {
+            override fun createFromParcel(parcel: Parcel) = Theme(parcel)
+            override fun newArray(size: Int) = arrayOfNulls<Theme>(size)
+        }
+
+        fun fromSharedPrefs(sharedPrefs: SharedPreferences): Theme {
+            val color = sharedPrefs.getString("color", "green")!!
+            val black = sharedPrefs.getBoolean("black_theme", false)
+            return Theme(color, black)
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/ThumbnailsLoader.kt

@@ -0,0 +1,92 @@
+package sushi.hardcore.droidfs
+
+import android.content.Context
+import android.graphics.drawable.Drawable
+import android.widget.ImageView
+import androidx.lifecycle.LifecycleCoroutineScope
+import com.bumptech.glide.Glide
+import com.bumptech.glide.request.target.DrawableImageViewTarget
+import com.bumptech.glide.request.transition.Transition
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import kotlinx.coroutines.yield
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+
+class ThumbnailsLoader(
+    private val context: Context,
+    private val encryptedVolume: EncryptedVolume,
+    private val maxSize: Long,
+    private val lifecycleScope: LifecycleCoroutineScope
+) {
+    internal class ThumbnailData(val id: Int, val path: String, val imageView: ImageView, val onLoaded: (Drawable) -> Unit)
+    internal class ThumbnailTask(var senderJob: Job?, var workerJob: Job?, var target: DrawableImageViewTarget?)
+
+    private val concurrentTasks = Runtime.getRuntime().availableProcessors()/4
+    private val channel = Channel<ThumbnailData>(concurrentTasks)
+    private var taskId = 0
+    private val tasks = HashMap<Int, ThumbnailTask>()
+
+    private suspend fun loadThumbnail(data: ThumbnailData) {
+        withContext(Dispatchers.IO) {
+            encryptedVolume.loadWholeFile(data.path, maxSize = maxSize).first?.let {
+                yield()
+                withContext(Dispatchers.Main) {
+                    tasks[data.id]?.let { task ->
+                        val channel = Channel<Unit>(1)
+                        task.target = Glide.with(context).load(it).skipMemoryCache(true).into(object : DrawableImageViewTarget(data.imageView) {
+                            override fun onResourceReady(
+                                resource: Drawable,
+                                transition: Transition<in Drawable>?
+                            ) {
+                                super.onResourceReady(resource, transition)
+                                data.onLoaded(resource)
+                                channel.trySend(Unit)
+                            }
+                        })
+                        channel.receive()
+                        tasks.remove(data.id)
+                    }
+                }
+            }
+        }
+    }
+
+    fun initialize() {
+        for (i in 0 until concurrentTasks) {
+            lifecycleScope.launch {
+                while (true) {
+                    val data = channel.receive()
+                    val workerJob = launch {
+                        loadThumbnail(data)
+                    }
+                    tasks[data.id]?.workerJob = workerJob
+                    workerJob.join()
+                }
+            }
+        }
+    }
+
+    fun loadAsync(path: String, target: ImageView, onLoaded: (Drawable) -> Unit): Int {
+        val id = taskId++
+        tasks[id] = ThumbnailTask(null, null, null)
+        val senderJob = lifecycleScope.launch {
+            channel.send(ThumbnailData(id, path, target, onLoaded))
+        }
+        tasks[id]!!.senderJob = senderJob
+        return id
+    }
+
+    fun cancel(id: Int) {
+        tasks[id]?.let { task ->
+            task.senderJob?.cancel()
+            task.workerJob?.cancel()
+            task.target?.let {
+                Glide.with(context).clear(it)
+            }
+        }
+        tasks.remove(id)
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/Volume.kt

@@ -1,54 +0,0 @@
-package sushi.hardcore.droidfs
-
-import android.os.Parcel
-import android.os.Parcelable
-import sushi.hardcore.droidfs.util.PathUtils
-import java.io.File
-
-class Volume(val name: String, val isHidden: Boolean = false, var encryptedHash: ByteArray? = null, var iv: ByteArray? = null): Parcelable {
-
-    constructor(parcel: Parcel) : this(
-        parcel.readString()!!,
-        parcel.readByte() != 0.toByte(),
-        parcel.createByteArray(),
-        parcel.createByteArray()
-    )
-
-    val shortName: String by lazy {
-        File(name).name
-    }
-
-    fun getFullPath(filesDir: String): String {
-        return if (isHidden)
-            PathUtils.pathJoin(filesDir, name)
-        else
-            name
-    }
-
-    fun canWrite(filesDir: String): Boolean {
-        return File(getFullPath(filesDir)).canWrite()
-    }
-
-    override fun describeContents(): Int {
-        return 0
-    }
-
-    override fun writeToParcel(dest: Parcel, flags: Int) {
-        with (dest) {
-            writeString(name)
-            writeByte(if (isHidden) 1 else 0)
-            writeByteArray(encryptedHash)
-            writeByteArray(iv)
-        }
-    }
-
-    companion object CREATOR : Parcelable.Creator<Volume> {
-        override fun createFromParcel(parcel: Parcel): Volume {
-            return Volume(parcel)
-        }
-
-        override fun newArray(size: Int): Array<Volume?> {
-            return arrayOfNulls(size)
-        }
-    }
-}

app/src/main/java/sushi/hardcore/droidfs/VolumeData.kt

@@ -0,0 +1,109 @@
+package sushi.hardcore.droidfs
+
+import android.os.Parcel
+import android.os.Parcelable
+import sushi.hardcore.droidfs.filesystems.CryfsVolume
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.filesystems.GocryptfsVolume
+import sushi.hardcore.droidfs.util.PathUtils
+import java.io.File
+import java.io.FileInputStream
+import java.util.UUID
+
+class VolumeData(
+    val uuid: String,
+    val name: String,
+    val isHidden: Boolean = false,
+    val type: Byte,
+    var encryptedHash: ByteArray? = null,
+    var iv: ByteArray? = null
+) : Parcelable {
+
+    constructor(parcel: Parcel) : this(
+        parcel.readString()!!,
+        parcel.readString()!!,
+        parcel.readByte() != 0.toByte(),
+        parcel.readByte(),
+        parcel.createByteArray(),
+        parcel.createByteArray()
+    )
+
+    val shortName: String by lazy {
+        File(name).name
+    }
+
+    fun getFullPath(filesDir: String) = getFullPath(name, isHidden, filesDir)
+
+    fun canRead(filesDir: String): Boolean {
+        val volumePath = getFullPath(filesDir)
+        if (!File(volumePath).canRead()) {
+            return false
+        }
+        val configFile = when (type) {
+            EncryptedVolume.GOCRYPTFS_VOLUME_TYPE -> PathUtils.pathJoin(volumePath, GocryptfsVolume.CONFIG_FILE_NAME)
+            EncryptedVolume.CRYFS_VOLUME_TYPE -> PathUtils.pathJoin(volumePath, CryfsVolume.CONFIG_FILE_NAME)
+            else -> return false
+        }
+        var success = true
+        try {
+            with (FileInputStream(configFile)) {
+                read()
+                close()
+            }
+        } catch (e: Exception) {
+            success = false
+        }
+        return success
+    }
+
+    fun canWrite(filesDir: String): Boolean {
+        return File(getFullPath(filesDir)).canWrite()
+    }
+
+    override fun describeContents(): Int {
+        return 0
+    }
+
+    override fun writeToParcel(dest: Parcel, flags: Int) {
+        with (dest) {
+            writeString(uuid)
+            writeString(name)
+            writeByte(if (isHidden) 1 else 0)
+            writeByte(type)
+            writeByteArray(encryptedHash)
+            writeByteArray(iv)
+        }
+    }
+
+    override fun equals(other: Any?): Boolean {
+        if (other !is VolumeData) {
+            return false
+        }
+        return other.uuid == uuid
+    }
+
+    override fun hashCode() = uuid.hashCode()
+
+    companion object {
+        const val VOLUMES_DIRECTORY = "volumes"
+
+        @JvmField
+        val CREATOR = object : Parcelable.Creator<VolumeData> {
+            override fun createFromParcel(parcel: Parcel) = VolumeData(parcel)
+            override fun newArray(size: Int) = arrayOfNulls<VolumeData>(size)
+        }
+
+        fun newUuid(): String = UUID.randomUUID().toString()
+
+        fun getHiddenVolumeFullPath(filesDir: String, name: String): String {
+            return PathUtils.pathJoin(filesDir, VOLUMES_DIRECTORY, name)
+        }
+
+        fun getFullPath(name: String, isHidden: Boolean, filesDir: String): String {
+            return if (isHidden)
+                getHiddenVolumeFullPath(filesDir, name)
+            else
+                name
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/VolumeDatabase.kt

@@ -2,75 +2,223 @@ package sushi.hardcore.droidfs
 
 import android.content.ContentValues
 import android.content.Context
+import android.database.Cursor
 import android.database.sqlite.SQLiteDatabase
 import android.database.sqlite.SQLiteOpenHelper
+import android.util.Log
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.util.PathUtils
+import java.io.File
 
-class VolumeDatabase(context: Context): SQLiteOpenHelper(context,
+class VolumeDatabase(private val context: Context): SQLiteOpenHelper(context, Constants.VOLUME_DATABASE_NAME, null, 6) {
-    ConstValues.VOLUME_DATABASE_NAME, null, 3) {
     companion object {
-        const val TABLE_NAME = "Volumes"
+        private const val TAG = "VolumeDatabase"
-        const val COLUMN_NAME = "name"
+        private const val TABLE_NAME = "Volumes"
-        const val COLUMN_HIDDEN = "hidden"
+        private const val COLUMN_UUID = "uuid"
-        const val COLUMN_HASH = "hash"
+        private const val COLUMN_NAME = "name"
-        const val COLUMN_IV = "iv"
+        private const val COLUMN_HIDDEN = "hidden"
+        private const val COLUMN_TYPE = "type"
+        private const val COLUMN_HASH = "hash"
+        private const val COLUMN_IV = "iv"
+    }
 
-        private fun contentValuesFromVolume(volume: Volume): ContentValues {
+    private fun createTable(db: SQLiteDatabase) =
-            val contentValues = ContentValues()
+        db.execSQL(
-            contentValues.put(COLUMN_NAME, volume.name)
+        "CREATE TABLE IF NOT EXISTS $TABLE_NAME (" +
-            contentValues.put(COLUMN_HIDDEN, volume.isHidden)
+                "$COLUMN_UUID TEXT PRIMARY KEY," +
-            contentValues.put(COLUMN_HASH, volume.encryptedHash)
+                "$COLUMN_NAME TEXT," +
-            contentValues.put(COLUMN_IV, volume.iv)
+                "$COLUMN_HIDDEN SHORT," +
-            return contentValues
+                "$COLUMN_TYPE BLOB," +
+                "$COLUMN_HASH BLOB," +
+                "$COLUMN_IV BLOB" +
+            ");"
+        )
+
+    override fun onCreate(db: SQLiteDatabase) {
+        createTable(db)
+        File(context.filesDir, VolumeData.VOLUMES_DIRECTORY).mkdir()
+    }
+
+    override fun onOpen(db: SQLiteDatabase) {
+        //check if database has been corrupted by v2.1.1
+        val cursor = db.rawQuery("SELECT * FROM $TABLE_NAME WHERE $COLUMN_TYPE IS NULL;", null)
+        if (cursor.count > 0) {
+            Log.w(TAG, "Found ${cursor.count} corrupted volumes")
+            while (cursor.moveToNext()) {
+                // fix columns left shift
+                val uuid = cursor.getString(cursor.getColumnIndexOrThrow(COLUMN_UUID)+5)
+                val name = cursor.getString(cursor.getColumnIndexOrThrow(COLUMN_NAME)-1)
+                val isHidden = cursor.getShort(cursor.getColumnIndexOrThrow(COLUMN_HIDDEN)-1) == 1.toShort()
+                val type = cursor.getBlob(cursor.getColumnIndexOrThrow(COLUMN_TYPE)-1)[0]
+                val hash = cursor.getBlob(cursor.getColumnIndexOrThrow(COLUMN_HASH)-1)
+                val iv = cursor.getBlob(cursor.getColumnIndexOrThrow(COLUMN_IV)-1)
+                if (db.delete(TABLE_NAME, "$COLUMN_IV=?", arrayOf(uuid)) < 1) {
+                    Log.e(TAG, "Failed to remove volume $name")
+                }
+                if (db.insert(TABLE_NAME, null, ContentValues().apply {
+                        put(COLUMN_UUID, uuid)
+                        put(COLUMN_NAME, name)
+                        put(COLUMN_HIDDEN, isHidden)
+                        put(COLUMN_TYPE, byteArrayOf(type))
+                        put(COLUMN_HASH, hash)
+                        put(COLUMN_IV, iv)
+                    }) < 0) {
+                    Log.e(TAG, "Failed to insert volume $name")
+                }
+            }
+        }
+        cursor.close()
+    }
+
+    private fun getNewVolumePath(volumeName: String): File {
+        return File(
+            VolumeData.getFullPath(volumeName, true, context.filesDir.path)
+        ).canonicalFile
+    }
+
+    override fun onUpgrade(db: SQLiteDatabase, oldVersion: Int, newVersion: Int) {
+        if (oldVersion == 3) {
+            // Adding type column and set it to GOCRYPTFS_VOLUME_TYPE for all existing volumes
+            db.execSQL("ALTER TABLE $TABLE_NAME ADD COLUMN $COLUMN_TYPE BLOB;")
+            db.update(TABLE_NAME, ContentValues().apply {
+                put(COLUMN_TYPE, byteArrayOf(EncryptedVolume.GOCRYPTFS_VOLUME_TYPE))
+            }, null, null)
+
+            // Moving registered hidden volumes to the "volumes" directory
+            if (File(context.filesDir, VolumeData.VOLUMES_DIRECTORY).mkdir()) {
+                val cursor = db.query(
+                    TABLE_NAME,
+                    arrayOf(COLUMN_NAME),
+                    "$COLUMN_HIDDEN=?",
+                    arrayOf("1"),
+                    null,
+                    null,
+                    null
+                )
+                while (cursor.moveToNext()) {
+                    val volumeName = cursor.getString(cursor.getColumnIndexOrThrow(COLUMN_NAME))
+                    val success = File(
+                        PathUtils.pathJoin(
+                            context.filesDir.path,
+                            volumeName
+                        )
+                    ).renameTo(getNewVolumePath(volumeName))
+                    if (!success) {
+                        Log.e(TAG, "Failed to move $volumeName")
+                    }
+                }
+                cursor.close()
+            } else {
+                Log.e(TAG, "Volumes directory creation failed while upgrading")
+            }
+        }
+        // Moving unregistered hidden volumes to the "volumes" directory
+        File(context.filesDir.path).listFiles()?.let {
+            for (i in it) {
+                if (i.isDirectory && i.name != Constants.CRYFS_LOCAL_STATE_DIR && i.name != VolumeData.VOLUMES_DIRECTORY) {
+                    if (EncryptedVolume.getVolumeType(i.path) != (-1).toByte()) {
+                        if (!i.renameTo(getNewVolumePath(i.name))) {
+                            Log.e(TAG, "Failed to move "+i.name)
+                        }
+                    }
+                }
+            }
+        }
+        if (oldVersion < 6) {
+            val cursor = db.rawQuery("SELECT $COLUMN_NAME FROM $TABLE_NAME;", null)
+            val volumeNames = arrayOfNulls<String>(cursor.count)
+            var i = 0
+            while (cursor.moveToNext()) {
+                volumeNames[i++] = cursor.getString(0)
+            }
+            cursor.close()
+            if (volumeNames.isEmpty()) {
+                db.execSQL("DROP TABLE $TABLE_NAME;")
+                createTable(db)
+            } else {
+                db.execSQL("ALTER TABLE $TABLE_NAME RENAME TO OLD;")
+                createTable(db)
+                val uuidsValues = volumeNames.indices.joinToString(", ") { "('${VolumeData.newUuid()}', ?)" }
+                // add uuids to old data
+                db.execSQL(
+                    "INSERT INTO $TABLE_NAME " +
+                            "WITH uuids($COLUMN_UUID, $COLUMN_NAME) AS (VALUES $uuidsValues) " +
+                            "SELECT $COLUMN_UUID, OLD.$COLUMN_NAME, $COLUMN_HIDDEN, $COLUMN_TYPE, $COLUMN_HASH, $COLUMN_IV " +
+                            "FROM OLD JOIN uuids ON OLD.name = uuids.name;",
+                    volumeNames
+                )
+                db.execSQL("DROP TABLE OLD;")
+            }
         }
     }
-    override fun onCreate(db: SQLiteDatabase) {
+
-        db.execSQL(
+    private fun extractVolumeData(cursor: Cursor): VolumeData {
-            "CREATE TABLE IF NOT EXISTS $TABLE_NAME ($COLUMN_NAME TEXT PRIMARY KEY, $COLUMN_HIDDEN SHORT, $COLUMN_HASH BLOB, $COLUMN_IV BLOB);"
+        return VolumeData(
+            cursor.getString(cursor.getColumnIndexOrThrow(COLUMN_UUID)),
+            cursor.getString(cursor.getColumnIndexOrThrow(COLUMN_NAME)),
+            cursor.getShort(cursor.getColumnIndexOrThrow(COLUMN_HIDDEN)) == 1.toShort(),
+            cursor.getBlob(cursor.getColumnIndexOrThrow(COLUMN_TYPE))[0],
+            cursor.getBlob(cursor.getColumnIndexOrThrow(COLUMN_HASH)),
+            cursor.getBlob(cursor.getColumnIndexOrThrow(COLUMN_IV))
         )
     }
 
-    override fun onUpgrade(db: SQLiteDatabase, oldVersion: Int, newVersion: Int) {}
+    private fun getVolumeCursor(volumeName: String, isHidden: Boolean): Cursor {
-
+        return readableDatabase.query(
-    fun isVolumeSaved(volumeName: String, isHidden: Boolean): Boolean {
+            TABLE_NAME, null,
-        val cursor = readableDatabase.query(TABLE_NAME,
+            "$COLUMN_NAME=? AND $COLUMN_HIDDEN=?",
-            arrayOf(COLUMN_NAME), "$COLUMN_NAME=? AND $COLUMN_HIDDEN=?",
             arrayOf(volumeName, (if (isHidden) 1 else 0).toString()),
             null, null, null
         )
+    }
+
+    fun getVolume(volumeName: String, isHidden: Boolean): VolumeData? {
+        val cursor = getVolumeCursor(volumeName, isHidden)
+        val volumeData = if (cursor.moveToNext()) {
+            extractVolumeData(cursor)
+        } else {
+            null
+        }
+        cursor.close()
+        return volumeData
+    }
+
+    fun isVolumeSaved(volumeName: String, isHidden: Boolean): Boolean {
+        val cursor = getVolumeCursor(volumeName, isHidden)
         val result = cursor.count > 0
         cursor.close()
         return result
     }
 
-    fun saveVolume(volume: Volume): Boolean {
+    fun saveVolume(volume: VolumeData): Boolean {
         if (!isVolumeSaved(volume.name, volume.isHidden)) {
-            return (writableDatabase.insert(TABLE_NAME, null, contentValuesFromVolume(volume)) == 0.toLong())
+            return (writableDatabase.insert(TABLE_NAME, null, ContentValues().apply {
+                put(COLUMN_UUID, volume.uuid)
+                put(COLUMN_NAME, volume.name)
+                put(COLUMN_HIDDEN, volume.isHidden)
+                put(COLUMN_TYPE, byteArrayOf(volume.type))
+                put(COLUMN_HASH, volume.encryptedHash)
+                put(COLUMN_IV, volume.iv)
+            }) >= 0.toLong())
         }
         return false
     }
 
-    fun getVolumes(): List<Volume> {
+    fun getVolumes(): List<VolumeData> {
-        val list: MutableList<Volume> = ArrayList()
+        val list: MutableList<VolumeData> = ArrayList()
         val cursor = readableDatabase.rawQuery("SELECT * FROM $TABLE_NAME", null)
         while (cursor.moveToNext()){
-            list.add(
+            list.add(extractVolumeData(cursor))
-                Volume(
-                    cursor.getString(cursor.getColumnIndex(COLUMN_NAME)),
-                    cursor.getShort(cursor.getColumnIndex(COLUMN_HIDDEN)) == 1.toShort(),
-                    cursor.getBlob(cursor.getColumnIndex(COLUMN_HASH)),
-                    cursor.getBlob(cursor.getColumnIndex(COLUMN_IV))
-                )
-            )
         }
         cursor.close()
         return list
     }
 
-    fun isHashSaved(volumeName: String): Boolean {
+    fun isHashSaved(volume: VolumeData): Boolean {
-        val cursor = readableDatabase.query(TABLE_NAME, arrayOf(COLUMN_NAME, COLUMN_HASH), "$COLUMN_NAME=?", arrayOf(volumeName), null, null, null)
+        val cursor = readableDatabase.rawQuery("SELECT $COLUMN_HASH FROM $TABLE_NAME WHERE $COLUMN_UUID=?", arrayOf(volume.uuid))
         var isHashSaved = false
         if (cursor.moveToNext()) {
-            if (cursor.getBlob(cursor.getColumnIndex(COLUMN_HASH)) != null) {
+            if (cursor.getBlob(cursor.getColumnIndexOrThrow(COLUMN_HASH)) != null) {
                 isHashSaved = true
             }
         }
@@ -78,32 +226,34 @@ class VolumeDatabase(context: Context): SQLiteOpenHelper(context,
         return isHashSaved
     }
 
-    fun addHash(volume: Volume): Boolean {
+    fun addHash(volume: VolumeData): Boolean {
-        return writableDatabase.update(TABLE_NAME, contentValuesFromVolume(volume), "$COLUMN_NAME=?", arrayOf(volume.name)) > 0
+        return writableDatabase.update(TABLE_NAME, ContentValues().apply {
+            put(COLUMN_HASH, volume.encryptedHash)
+            put(COLUMN_IV, volume.iv)
+        }, "$COLUMN_UUID=?", arrayOf(volume.uuid)) > 0
     }
 
-    fun removeHash(volume: Volume): Boolean {
+    fun removeHash(volume: VolumeData): Boolean {
         return writableDatabase.update(
-            TABLE_NAME, contentValuesFromVolume(
+            TABLE_NAME,
-            Volume(
-                volume.name,
-                volume.isHidden,
-                null,
-                null
-            )
-        ), "$COLUMN_NAME=?", arrayOf(volume.name)) > 0
-    }
-
-    fun renameVolume(oldName: String, newName: String): Boolean {
-        return writableDatabase.update(TABLE_NAME,
             ContentValues().apply {
-                put(COLUMN_NAME, newName)
+                put(COLUMN_HASH, null as ByteArray?)
-            },
+                put(COLUMN_IV, null as ByteArray?)
-            "$COLUMN_NAME=?",arrayOf(oldName)
+            }, "$COLUMN_UUID=?", arrayOf(volume.uuid)
         ) > 0
     }
 
-    fun removeVolume(volumeName: String): Boolean {
+    fun renameVolume(volume: VolumeData, newName: String): Boolean {
-        return writableDatabase.delete(TABLE_NAME, "$COLUMN_NAME=?", arrayOf(volumeName)) > 0
+        return writableDatabase.update(
+            TABLE_NAME,
+            ContentValues().apply {
+                put(COLUMN_NAME, newName)
+            },
+            "$COLUMN_UUID=?", arrayOf(volume.uuid)
+        ) > 0
+    }
+
+    fun removeVolume(volume: VolumeData): Boolean {
+        return writableDatabase.delete(TABLE_NAME, "$COLUMN_UUID=?", arrayOf(volume.uuid)) > 0
     }
 }

app/src/main/java/sushi/hardcore/droidfs/VolumeManager.kt

@@ -0,0 +1,64 @@
+package sushi.hardcore.droidfs
+
+import android.content.Context
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancel
+import sushi.hardcore.droidfs.content_providers.VolumeProvider
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+
+class VolumeManager(private val context: Context) {
+    private var id = 0
+    private val volumes = HashMap<Int, EncryptedVolume>()
+    private val volumesData = HashMap<VolumeData, Int>()
+    private val scopes = HashMap<Int, CoroutineScope>()
+
+    fun insert(volume: EncryptedVolume, data: VolumeData): Int {
+        volumes[id] = volume
+        volumesData[data] = id
+        VolumeProvider.notifyRootsChanged(context)
+        return id++
+    }
+
+    fun isOpen(volume: VolumeData): Boolean {
+        return volumesData.containsKey(volume)
+    }
+
+    fun getVolumeId(volume: VolumeData): Int? {
+        return volumesData[volume]
+    }
+
+    fun getVolume(id: Int): EncryptedVolume? {
+        return volumes[id]
+    }
+
+    fun listVolumes(): List<Pair<Int, VolumeData>> {
+        return volumesData.map { (data, id) -> Pair(id, data) }
+    }
+
+    fun getCoroutineScope(volumeId: Int): CoroutineScope {
+        return scopes[volumeId] ?: CoroutineScope(SupervisorJob() + Dispatchers.IO).also { scopes[volumeId] = it }
+    }
+
+    fun closeVolume(id: Int) {
+        volumes.remove(id)?.let { volume ->
+            scopes[id]?.cancel()
+            volume.close()
+            volumesData.filter { it.value == id }.forEach {
+                volumesData.remove(it.key)
+            }
+            VolumeProvider.notifyRootsChanged(context)
+        }
+    }
+
+    fun closeAll() {
+        volumes.forEach {
+            scopes[it.key]?.cancel()
+            it.value.close()
+        }
+        volumes.clear()
+        volumesData.clear()
+        VolumeProvider.notifyRootsChanged(context)
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/VolumeManagerApp.kt

@@ -0,0 +1,54 @@
+package sushi.hardcore.droidfs
+
+import android.app.Application
+import android.content.SharedPreferences
+import androidx.lifecycle.DefaultLifecycleObserver
+import androidx.lifecycle.LifecycleOwner
+import androidx.lifecycle.ProcessLifecycleOwner
+import androidx.preference.PreferenceManager
+import sushi.hardcore.droidfs.content_providers.TemporaryFileProvider
+
+class VolumeManagerApp : Application(), DefaultLifecycleObserver {
+    companion object {
+        private const val USF_KEEP_OPEN_KEY = "usf_keep_open"
+    }
+
+    lateinit var sharedPreferences: SharedPreferences
+    private val sharedPreferencesListener = SharedPreferences.OnSharedPreferenceChangeListener { _, key ->
+        if (key == USF_KEEP_OPEN_KEY) {
+            reloadUsfKeepOpen()
+        }
+    }
+    private var usfKeepOpen = false
+    var isExporting = false
+    var isStartingExternalApp = false
+    val volumeManager = VolumeManager(this)
+
+    override fun onCreate() {
+        super<Application>.onCreate()
+        ProcessLifecycleOwner.get().lifecycle.addObserver(this)
+        sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this).apply {
+            registerOnSharedPreferenceChangeListener(sharedPreferencesListener)
+        }
+        reloadUsfKeepOpen()
+    }
+
+    private fun reloadUsfKeepOpen() {
+        usfKeepOpen = sharedPreferences.getBoolean(USF_KEEP_OPEN_KEY, false)
+    }
+
+    override fun onResume(owner: LifecycleOwner) {
+        isStartingExternalApp = false
+    }
+
+    override fun onStop(owner: LifecycleOwner) {
+        if (!isStartingExternalApp) {
+            if (!usfKeepOpen) {
+                volumeManager.closeAll()
+            }
+            if (!usfKeepOpen || !isExporting) {
+                TemporaryFileProvider.instance.wipe()
+            }
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/VolumeOpener.kt

@@ -0,0 +1,227 @@
+package sushi.hardcore.droidfs
+
+import android.annotation.SuppressLint
+import android.os.Build
+import android.text.InputType
+import android.view.View
+import android.view.WindowManager
+import android.widget.Toast
+import androidx.fragment.app.FragmentActivity
+import androidx.lifecycle.lifecycleScope
+import androidx.preference.PreferenceManager
+import sushi.hardcore.droidfs.Constants.DEFAULT_VOLUME_KEY
+import sushi.hardcore.droidfs.databinding.DialogOpenVolumeBinding
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.util.ObjRef
+import sushi.hardcore.droidfs.util.UIUtils
+import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
+import java.util.*
+
+class VolumeOpener(
+    private val activity: FragmentActivity,
+) {
+    interface VolumeOpenerCallbacks {
+        fun onHashStorageReset() {}
+        fun onVolumeOpened(id: Int)
+    }
+
+    private val volumeDatabase = VolumeDatabase(activity)
+    private var fingerprintProtector: FingerprintProtector? = null
+    private val sharedPrefs = PreferenceManager.getDefaultSharedPreferences(activity)
+    private val theme = (activity as BaseActivity).theme
+    var defaultVolumeName: String? = sharedPrefs.getString(DEFAULT_VOLUME_KEY, null)
+    private var dialogBinding: DialogOpenVolumeBinding? = null
+    private val volumeManager = (activity.application as VolumeManagerApp).volumeManager
+
+    init {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+            fingerprintProtector = FingerprintProtector.new(activity, theme, volumeDatabase)
+        }
+    }
+
+    private fun getErrorMsg(result: EncryptedVolume.InitResult): String {
+        return if (result.errorStringId == 0) {
+            activity.getString(R.string.unknown_error_code, result.errorCode)
+        } else {
+            activity.getString(result.errorStringId)
+        }
+    }
+
+    @SuppressLint("NewApi") // fingerprintProtector is non-null only when SDK_INT >= 23
+    fun openVolume(volume: VolumeData, isVolumeSaved: Boolean, callbacks: VolumeOpenerCallbacks) {
+        val volumeId = volumeManager.getVolumeId(volume)
+        if (volumeId == null) {
+            if (volume.type == EncryptedVolume.GOCRYPTFS_VOLUME_TYPE && BuildConfig.GOCRYPTFS_DISABLED) {
+                Toast.makeText(activity, R.string.gocryptfs_disabled, Toast.LENGTH_SHORT).show()
+                return
+            } else if (volume.type == EncryptedVolume.CRYFS_VOLUME_TYPE && BuildConfig.CRYFS_DISABLED) {
+                Toast.makeText(activity, R.string.cryfs_disabled, Toast.LENGTH_SHORT).show()
+                return
+            }
+            var askForPassword = true
+            fingerprintProtector?.let { fingerprintProtector ->
+                volume.encryptedHash?.let { encryptedHash ->
+                    volume.iv?.let { iv ->
+                        askForPassword = false
+                        fingerprintProtector.listener = object : FingerprintProtector.Listener {
+                            override fun onHashStorageReset() {
+                                callbacks.onHashStorageReset()
+                            }
+                            override fun onPasswordHashDecrypted(hash: ByteArray) {
+                                object : LoadingTask<EncryptedVolume.InitResult>(activity, theme, R.string.loading_msg_open) {
+                                    override suspend fun doTask(): EncryptedVolume.InitResult {
+                                        val result = EncryptedVolume.init(volume, activity.filesDir.path, null, hash, null)
+                                        Arrays.fill(hash, 0)
+                                        return result
+                                    }
+                                }.startTask(activity.lifecycleScope) { result ->
+                                    val encryptedVolume = result.volume
+                                    if (encryptedVolume == null) {
+                                        CustomAlertDialogBuilder(activity, theme)
+                                            .setTitle(R.string.open_volume_failed)
+                                            .setMessage(getErrorMsg(result))
+                                            .setPositiveButton(R.string.ok, null)
+                                            .show()
+                                    } else {
+                                        callbacks.onVolumeOpened(volumeManager.insert(encryptedVolume, volume))
+                                    }
+                                }
+                            }
+                            override fun onPasswordHashSaved() {}
+                            override fun onFailed(pending: Boolean) {
+                                if (!pending && sharedPrefs.getBoolean("passwordFallback", true)) {
+                                    askForPassword(volume, isVolumeSaved, callbacks)
+                                }
+                            }
+                        }
+                        fingerprintProtector.loadPasswordHash(volume.shortName, encryptedHash, iv)
+                    }
+                }
+            }
+            if (askForPassword) {
+                askForPassword(volume, isVolumeSaved, callbacks)
+            }
+        } else {
+            callbacks.onVolumeOpened(volumeId)
+        }
+    }
+
+    fun wipeSensitive() {
+        dialogBinding?.editPassword?.text?.clear()
+    }
+
+    private fun onPasswordSubmitted(volume: VolumeData, isVolumeSaved: Boolean, callbacks: VolumeOpenerCallbacks) {
+        if (dialogBinding!!.checkboxDefaultOpen.isChecked xor (defaultVolumeName == volume.name)) {
+            with (sharedPrefs.edit()) {
+                defaultVolumeName = if (dialogBinding!!.checkboxDefaultOpen.isChecked) {
+                    putString(DEFAULT_VOLUME_KEY, volume.name)
+                    volume.name
+                } else {
+                    remove(DEFAULT_VOLUME_KEY)
+                    null
+                }
+                apply()
+            }
+        }
+        val password = UIUtils.encodeEditTextContent(dialogBinding!!.editPassword)
+        val savePasswordHash = dialogBinding!!.checkboxSavePassword.isChecked
+        dialogBinding = null
+        // openVolumeWithPassword is responsible for wiping the password
+        openVolumeWithPassword(
+            volume,
+            password,
+            isVolumeSaved,
+            savePasswordHash,
+            callbacks,
+        )
+    }
+
+    private fun askForPassword(volume: VolumeData, isVolumeSaved: Boolean, callbacks: VolumeOpenerCallbacks, savePasswordHash: Boolean = false) {
+        dialogBinding = DialogOpenVolumeBinding.inflate(activity.layoutInflater)
+        if (isVolumeSaved) {
+            if (!sharedPrefs.getBoolean("usf_fingerprint", false) || fingerprintProtector == null || volume.encryptedHash != null) {
+                dialogBinding!!.checkboxSavePassword.visibility = View.GONE
+            } else {
+                dialogBinding!!.checkboxSavePassword.isChecked = savePasswordHash
+            }
+            dialogBinding!!.checkboxDefaultOpen.isChecked = defaultVolumeName == volume.name
+        } else {
+            dialogBinding!!.checkboxSavePassword.visibility = View.GONE
+            dialogBinding!!.checkboxDefaultOpen.visibility = View.GONE
+        }
+        val dialog = CustomAlertDialogBuilder(activity, theme)
+            .setTitle(activity.getString(R.string.open_dialog_title, volume.shortName))
+            .setView(dialogBinding!!.root)
+            .setNegativeButton(R.string.cancel, null)
+            .setPositiveButton(R.string.open) { _, _ ->
+                onPasswordSubmitted(volume, isVolumeSaved, callbacks)
+            }
+            .create()
+        dialogBinding!!.editPassword.apply {
+            setOnEditorActionListener { _, _, _ ->
+                dialog.dismiss()
+                onPasswordSubmitted(volume, isVolumeSaved, callbacks)
+                true
+            }
+            if (sharedPrefs.getBoolean(Constants.PIN_PASSWORDS_KEY, false)) {
+                inputType = InputType.TYPE_CLASS_NUMBER or InputType.TYPE_NUMBER_VARIATION_PASSWORD
+            }
+        }
+        dialog.window?.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE)
+        dialog.show()
+    }
+
+    private fun openVolumeWithPassword(volume: VolumeData, password: ByteArray, isVolumeSaved: Boolean, savePasswordHash: Boolean, callbacks: VolumeOpenerCallbacks) {
+        val returnedHash: ObjRef<ByteArray?>? = if (savePasswordHash) {
+            ObjRef(null)
+        } else {
+            null
+        }
+        object : LoadingTask<EncryptedVolume.InitResult>(activity, theme, R.string.loading_msg_open) {
+            override suspend fun doTask(): EncryptedVolume.InitResult {
+                val result = EncryptedVolume.init(volume, activity.filesDir.path, password, null, returnedHash)
+                Arrays.fill(password, 0)
+                return result
+            }
+        }.startTask(activity.lifecycleScope) { result ->
+            val encryptedVolume = result.volume
+            if (encryptedVolume == null) {
+                CustomAlertDialogBuilder(activity, theme)
+                    .setTitle(R.string.open_volume_failed)
+                    .setMessage(getErrorMsg(result))
+                    .setPositiveButton(R.string.ok) { _, _ ->
+                        if (result.worthRetry) {
+                            askForPassword(volume, isVolumeSaved, callbacks, savePasswordHash)
+                        }
+                    }
+                    .show()
+            } else {
+                val fingerprintProtector = fingerprintProtector
+                @SuppressLint("NewApi") // fingerprintProtector is non-null only when SDK_INT >= 23
+                if (savePasswordHash && returnedHash != null && fingerprintProtector != null) {
+                    fingerprintProtector.listener = object : FingerprintProtector.Listener {
+                        override fun onHashStorageReset() {
+                            callbacks.onHashStorageReset()
+                        }
+                        override fun onPasswordHashDecrypted(hash: ByteArray) {}
+                        override fun onPasswordHashSaved() {
+                            Arrays.fill(returnedHash.value!!, 0)
+                            callbacks.onVolumeOpened(volumeManager.insert(encryptedVolume, volume))
+                        }
+                        private var isClosed = false
+                        override fun onFailed(pending: Boolean) {
+                            if (!isClosed) {
+                                encryptedVolume.close()
+                                isClosed = true
+                            }
+                            Arrays.fill(returnedHash.value!!, 0)
+                        }
+                    }
+                    fingerprintProtector.savePasswordHash(volume, returnedHash.value!!)
+                } else {
+                    callbacks.onVolumeOpened(volumeManager.insert(encryptedVolume, volume))
+                }
+            }
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/WiperService.kt

@@ -0,0 +1,17 @@
+package sushi.hardcore.droidfs
+
+import android.app.Service
+import android.content.Intent
+import android.os.IBinder
+
+class WiperService : Service() {
+    override fun onBind(intent: Intent): IBinder? {
+        return null
+    }
+
+    override fun onTaskRemoved(rootIntent: Intent) {
+        super.onTaskRemoved(rootIntent)
+        (application as VolumeManagerApp).volumeManager.closeAll()
+        stopSelf()
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/adapters/ExplorerElementAdapter.kt

@@ -2,7 +2,6 @@ package sushi.hardcore.droidfs.adapters
 
 import android.annotation.SuppressLint
 import android.graphics.Bitmap
-import android.graphics.drawable.Drawable
 import android.util.LruCache
 import android.view.View
 import android.view.ViewGroup
@@ -11,24 +10,24 @@ import android.widget.LinearLayout
 import android.widget.TextView
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.graphics.drawable.toBitmap
+import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.RecyclerView
-import com.bumptech.glide.Glide
-import com.bumptech.glide.request.target.DrawableImageViewTarget
-import com.bumptech.glide.request.transition.Transition
 import kotlinx.coroutines.*
-import sushi.hardcore.droidfs.ConstValues
+import sushi.hardcore.droidfs.FileTypes
-import sushi.hardcore.droidfs.GocryptfsVolume
 import sushi.hardcore.droidfs.R
+import sushi.hardcore.droidfs.ThumbnailsLoader
 import sushi.hardcore.droidfs.explorers.ExplorerElement
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.filesystems.Stat
 import sushi.hardcore.droidfs.util.PathUtils
 import java.text.DateFormat
 import java.util.*
 
 class ExplorerElementAdapter(
     val activity: AppCompatActivity,
-    val gocryptfsVolume: GocryptfsVolume?,
+    val encryptedVolume: EncryptedVolume?,
     private val listener: Listener,
-    val thumbnailMaxSize: Long,
+    thumbnailMaxSize: Long,
 ) : SelectableAdapter<ExplorerElement>(listener::onSelectionChanged) {
     val dateFormat: DateFormat = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.getDefault())
     var explorerElements = listOf<ExplorerElement>()
@@ -39,11 +38,18 @@ class ExplorerElementAdapter(
         notifyDataSetChanged()
     }
     var isUsingListLayout = true
+    private var thumbnailsLoader: ThumbnailsLoader? = null
     private var thumbnailsCache: LruCache<String, Bitmap>? = null
+    var loadThumbnails = true
 
     init {
-        if (gocryptfsVolume != null) {
+        if (encryptedVolume != null) {
-            thumbnailsCache = LruCache((Runtime.getRuntime().maxMemory() / 1024 / 8).toInt())
+            thumbnailsLoader = ThumbnailsLoader(activity, encryptedVolume, thumbnailMaxSize, activity.lifecycleScope).apply {
+                initialize()
+            }
+            thumbnailsCache = object : LruCache<String, Bitmap>((Runtime.getRuntime().maxMemory() / 4).toInt()) {
+                override fun sizeOf(key: String, value: Bitmap) = value.byteCount
+            }
         }
     }
 
@@ -105,48 +111,19 @@ class ExplorerElementAdapter(
     open class RegularElementViewHolder(itemView: View) : ExplorerElementViewHolder(itemView) {
         open fun bind(explorerElement: ExplorerElement, position: Int, isSelected: Boolean) {
             super.bind(explorerElement, position)
-            textElementSize.text = PathUtils.formatSize(explorerElement.size)
+            textElementSize.text = PathUtils.formatSize(explorerElement.stat.size)
             (bindingAdapter as ExplorerElementAdapter?)?.let {
-                textElementMtime.text = it.dateFormat.format(explorerElement.mTime)
+                textElementMtime.text = it.dateFormat.format(explorerElement.stat.mTime)
             }
         }
     }
 
     class FileViewHolder(itemView: View) : RegularElementViewHolder(itemView) {
-        private var target: DrawableImageViewTarget? = null
+        private var task = -1
-        private var job: Job? = null
-        private val scope = CoroutineScope(Dispatchers.IO)
-
-        private fun loadThumbnail(fullPath: String, adapter: ExplorerElementAdapter) {
-            adapter.gocryptfsVolume?.let { volume ->
-                job = scope.launch {
-                    volume.loadWholeFile(fullPath, maxSize = adapter.thumbnailMaxSize).first?.let {
-                        if (isActive) {
-                            withContext(Dispatchers.Main) {
-                                if (isActive && !adapter.activity.isFinishing) {
-                                    target = Glide.with(adapter.activity).load(it).skipMemoryCache(true).into(object : DrawableImageViewTarget(icon) {
-                                        override fun onResourceReady(
-                                            resource: Drawable,
-                                            transition: Transition<in Drawable>?
-                                        ) {
-                                            target = null
-                                            val bitmap = resource.toBitmap()
-                                            adapter.thumbnailsCache!!.put(fullPath, bitmap.copy(bitmap.config, true))
-                                            super.onResourceReady(resource, transition)
-                                        }
-                                    })
-                                }
-                            }
-                        }
-                    }
-                }
-            }
-        }
 
         fun cancelThumbnailLoading(adapter: ExplorerElementAdapter) {
-            job?.cancel()
+            if (task != -1) {
-            target?.let {
+                adapter.thumbnailsLoader?.cancel(task)
-                Glide.with(adapter.activity).clear(it)
             }
         }
 
@@ -158,8 +135,11 @@ class ExplorerElementAdapter(
                     if (thumbnail != null) {
                         icon.setImageBitmap(thumbnail)
                         setDefaultIcon = false
-                    } else {
+                    } else if (adapter.loadThumbnails) {
-                        loadThumbnail(fullPath, adapter)
+                        task = adapter.thumbnailsLoader!!.loadAsync(fullPath, icon) { resource ->
+                            val bitmap = resource.toBitmap()
+                            adapter.thumbnailsCache!!.put(fullPath, bitmap.copy(bitmap.config, true))
+                        }
                     }
                 }
             }
@@ -171,17 +151,17 @@ class ExplorerElementAdapter(
         override fun bind(explorerElement: ExplorerElement, position: Int, isSelected: Boolean) {
             super.bind(explorerElement, position, isSelected)
             when {
-                ConstValues.isImage(explorerElement.name) -> {
+                FileTypes.isImage(explorerElement.name) -> {
                     setThumbnailOrDefaultIcon(explorerElement.fullPath, R.drawable.icon_file_image)
                 }
-                ConstValues.isVideo(explorerElement.name) -> {
+                FileTypes.isVideo(explorerElement.name) -> {
                     setThumbnailOrDefaultIcon(explorerElement.fullPath, R.drawable.icon_file_video)
                 }
                 else -> icon.setImageResource(
                     when {
-                        ConstValues.isText(explorerElement.name) -> R.drawable.icon_file_text
+                        FileTypes.isText(explorerElement.name) -> R.drawable.icon_file_text
-                        ConstValues.isPDF(explorerElement.name) -> R.drawable.icon_file_pdf
+                        FileTypes.isPDF(explorerElement.name) -> R.drawable.icon_file_pdf
-                        ConstValues.isAudio(explorerElement.name) -> R.drawable.icon_file_audio
+                        FileTypes.isAudio(explorerElement.name) -> R.drawable.icon_file_audio
                         else -> R.drawable.icon_file_unknown
                     }
                 )
@@ -220,9 +200,9 @@ class ExplorerElementAdapter(
             }, parent, false
         )
         return when (viewType) {
-            ExplorerElement.REGULAR_FILE_TYPE -> FileViewHolder(view)
+            Stat.S_IFREG -> FileViewHolder(view)
-            ExplorerElement.DIRECTORY_TYPE -> DirectoryViewHolder(view)
+            Stat.S_IFDIR -> DirectoryViewHolder(view)
-            ExplorerElement.PARENT_FOLDER_TYPE -> ParentFolderViewHolder(view)
+            Stat.PARENT_FOLDER_TYPE -> ParentFolderViewHolder(view)
             else -> throw IllegalArgumentException()
         }
     }
@@ -237,6 +217,6 @@ class ExplorerElementAdapter(
     }
 
     override fun getItemViewType(position: Int): Int {
-        return explorerElements[position].elementType.toInt()
+        return explorerElements[position].stat.type
     }
 }

app/src/main/java/sushi/hardcore/droidfs/adapters/IconTextDialogAdapter.kt

@@ -7,7 +7,7 @@ import android.view.ViewGroup
 import android.widget.BaseAdapter
 import android.widget.ImageView
 import android.widget.TextView
-import androidx.appcompat.content.res.AppCompatResources
+import androidx.core.content.ContextCompat
 import sushi.hardcore.droidfs.R
 
 open class IconTextDialogAdapter(private val context: Context): BaseAdapter() {
@@ -19,7 +19,7 @@ open class IconTextDialogAdapter(private val context: Context): BaseAdapter() {
         val text = view.findViewById<TextView>(R.id.text)
         text.text = context.getString(items[position][1] as Int)
         val icon = view.findViewById<ImageView>(R.id.icon)
-        icon.setImageDrawable(AppCompatResources.getDrawable(context, items[position][2] as Int))
+        icon.setImageDrawable(ContextCompat.getDrawable(context, items[position][2] as Int))
         return view
     }
 

app/src/main/java/sushi/hardcore/droidfs/adapters/VolumeAdapter.kt

@@ -8,20 +8,24 @@ import android.view.ViewGroup
 import android.widget.ImageView
 import android.widget.LinearLayout
 import android.widget.TextView
+import androidx.core.view.isVisible
 import androidx.recyclerview.widget.RecyclerView
 import sushi.hardcore.droidfs.R
-import sushi.hardcore.droidfs.Volume
+import sushi.hardcore.droidfs.VolumeData
 import sushi.hardcore.droidfs.VolumeDatabase
+import sushi.hardcore.droidfs.VolumeManager
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
 
 class VolumeAdapter(
     private val context: Context,
     private val volumeDatabase: VolumeDatabase,
+    private val volumeManager: VolumeManager,
     private val allowSelection: Boolean,
     private val showReadOnly: Boolean,
     private val listener: Listener,
-) : SelectableAdapter<Volume>(listener::onSelectionChanged) {
+) : SelectableAdapter<VolumeData>(listener::onSelectionChanged) {
     private val inflater: LayoutInflater = LayoutInflater.from(context)
-    lateinit var volumes: List<Volume>
+    lateinit var volumes: List<VolumeData>
 
     init {
         reloadVolumes()
@@ -29,11 +33,11 @@ class VolumeAdapter(
 
     interface Listener {
         fun onSelectionChanged(size: Int)
-        fun onVolumeItemClick(volume: Volume, position: Int)
+        fun onVolumeItemClick(volume: VolumeData, position: Int)
         fun onVolumeItemLongClick()
     }
 
-    override fun getItems(): List<Volume> {
+    override fun getItems(): List<VolumeData> {
         return volumes
     }
 
@@ -79,23 +83,26 @@ class VolumeAdapter(
         fun bind(position: Int) {
             val volume = volumes[position]
             itemView.findViewById<TextView>(R.id.text_volume_name).text = volume.shortName
-            itemView.findViewById<ImageView>(R.id.image_icon).setImageResource(R.drawable.icon_volume)
             itemView.findViewById<TextView>(R.id.text_path).text = if (volume.isHidden)
                 context.getString(R.string.hidden_volume)
             else
                 volume.name
-            itemView.findViewById<ImageView>(R.id.icon_fingerprint).visibility = if (volume.encryptedHash == null) {
+            itemView.findViewById<ImageView>(R.id.icon_unlocked).isVisible = volumeManager.isOpen(volume)
-                View.GONE
+            itemView.findViewById<ImageView>(R.id.icon_fingerprint).isVisible = volume.encryptedHash != null
-            } else {
+            itemView.findViewById<TextView>(R.id.text_info).text = context.getString(
-                View.VISIBLE
+                if (volume.canWrite(context.filesDir.path)) {
-            }
+                    R.string.volume_type
-            itemView.findViewById<TextView>(R.id.text_read_only).apply {
+                } else if (volume.canRead(context.filesDir.path)) {
-                visibility = if (volume.canWrite(context.filesDir.path))
+                    R.string.volume_type_read_only
-                    View.GONE
+                } else {
-                else {
+                    R.string.volume_type_inaccessible
-                    View.VISIBLE
+                },
-                }
+                context.getString(if (volume.type == EncryptedVolume.GOCRYPTFS_VOLUME_TYPE) {
-            }
+                    R.string.gocryptfs
+                } else {
+                    R.string.cryfs
+                })
+            )
             setSelectable(itemView.findViewById<LinearLayout>(R.id.selectable_container), itemView, layoutPosition)
         }
     }

app/src/main/java/sushi/hardcore/droidfs/add_volume/AddVolumeActivity.kt

@@ -2,42 +2,52 @@ package sushi.hardcore.droidfs.add_volume
 
 import android.os.Bundle
 import android.view.MenuItem
-import sushi.hardcore.droidfs.BaseActivity
+import androidx.activity.addCallback
-import sushi.hardcore.droidfs.ConstValues
+import sushi.hardcore.droidfs.*
-import sushi.hardcore.droidfs.R
 import sushi.hardcore.droidfs.databinding.ActivityAddVolumeBinding
+import sushi.hardcore.droidfs.explorers.ExplorerRouter
 
 class AddVolumeActivity: BaseActivity() {
 
     companion object {
-        const val RESULT_VOLUME_ADDED = 1
+        const val RESULT_USER_BACK = 10
-        const val RESULT_HASH_STORAGE_RESET = 2
     }
 
     private lateinit var binding: ActivityAddVolumeBinding
+    private lateinit var explorerRouter: ExplorerRouter
+    private lateinit var volumeOpener: VolumeOpener
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         binding = ActivityAddVolumeBinding.inflate(layoutInflater)
         setContentView(binding.root)
         supportActionBar?.setDisplayHomeAsUpEnabled(true)
+        explorerRouter = ExplorerRouter(this, intent)
+        volumeOpener = VolumeOpener(this)
         if (savedInstanceState == null) {
             supportFragmentManager
                 .beginTransaction()
                 .add(
                     R.id.fragment_container,
-                    SelectPathFragment.newInstance(themeValue),
+                    SelectPathFragment.newInstance(theme, explorerRouter.pickMode),
                 )
                 .commit()
         }
+        onBackPressedDispatcher.addCallback(this) {
+            setResult(RESULT_USER_BACK)
+            isEnabled = false
+            onBackPressedDispatcher.onBackPressed()
+        }
     }
 
     override fun onOptionsItemSelected(item: MenuItem): Boolean {
         if (item.itemId == android.R.id.home) {
             if (supportFragmentManager.backStackEntryCount > 0)
                 supportFragmentManager.popBackStack()
-            else
+            else {
+                setResult(RESULT_USER_BACK)
                 finish()
+            }
         }
         return super.onOptionsItemSelected(item)
     }
@@ -52,24 +62,34 @@ class AddVolumeActivity: BaseActivity() {
         )
     }
 
-    fun onSelectedAlreadySavedVolume() {
+    fun startExplorer(volumeId: Int, volumeShortName: String) {
+        startActivity(explorerRouter.getExplorerIntent(volumeId, volumeShortName))
         finish()
     }
 
-    fun onVolumeAdded(hashStorageReset: Boolean) {
+    fun onVolumeSelected(volume: VolumeData, rememberVolume: Boolean) {
-        setResult(if (hashStorageReset) RESULT_HASH_STORAGE_RESET else RESULT_VOLUME_ADDED)
+        if (rememberVolume) {
-        finish()
+            setResult(RESULT_USER_BACK)
+            finish()
+        } else {
+            volumeOpener.openVolume(volume, false, object : VolumeOpener.VolumeOpenerCallbacks {
+                override fun onVolumeOpened(id: Int) {
+                    startExplorer(id, volume.shortName)
+                }
+            })
+        }
     }
 
-    fun createVolume(volumePath: String, isHidden: Boolean) {
+    fun createVolume(volumePath: String, isHidden: Boolean, rememberVolume: Boolean) {
         supportFragmentManager
             .beginTransaction()
             .replace(
                 R.id.fragment_container, CreateVolumeFragment.newInstance(
-                    themeValue,
+                    theme,
                     volumePath,
                     isHidden,
-                    sharedPrefs.getBoolean(ConstValues.PIN_PASSWORDS_KEY, false),
+                    rememberVolume,
+                    sharedPrefs.getBoolean(Constants.PIN_PASSWORDS_KEY, false),
                     sharedPrefs.getBoolean("usf_fingerprint", false),
                 )
             )

app/src/main/java/sushi/hardcore/droidfs/add_volume/CreateVolumeFragment.kt

@@ -15,6 +15,12 @@ import androidx.fragment.app.Fragment
 import androidx.lifecycle.lifecycleScope
 import sushi.hardcore.droidfs.*
 import sushi.hardcore.droidfs.databinding.FragmentCreateVolumeBinding
+import sushi.hardcore.droidfs.filesystems.CryfsVolume
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.filesystems.GocryptfsVolume
+import sushi.hardcore.droidfs.util.Compat
+import sushi.hardcore.droidfs.util.ObjRef
+import sushi.hardcore.droidfs.util.UIUtils
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import java.io.File
 import java.util.*
@@ -24,21 +30,24 @@ class CreateVolumeFragment: Fragment() {
         private const val KEY_THEME_VALUE = "theme"
         private const val KEY_VOLUME_PATH = "path"
         private const val KEY_IS_HIDDEN = "hidden"
-        private const val KEY_PIN_PASSWORDS = ConstValues.PIN_PASSWORDS_KEY
+        private const val KEY_REMEMBER_VOLUME = "remember"
+        private const val KEY_PIN_PASSWORDS = Constants.PIN_PASSWORDS_KEY
         private const val KEY_USF_FINGERPRINT = "fingerprint"
 
         fun newInstance(
-            themeValue: String,
+            theme: Theme,
             volumePath: String,
             isHidden: Boolean,
+            rememberVolume: Boolean,
             pinPasswords: Boolean,
             usfFingerprint: Boolean,
         ): CreateVolumeFragment {
             return CreateVolumeFragment().apply {
                 arguments = Bundle().apply {
-                    putString(KEY_THEME_VALUE, themeValue)
+                    putParcelable(KEY_THEME_VALUE, theme)
                     putString(KEY_VOLUME_PATH, volumePath)
                     putBoolean(KEY_IS_HIDDEN, isHidden)
+                    putBoolean(KEY_REMEMBER_VOLUME, rememberVolume)
                     putBoolean(KEY_PIN_PASSWORDS, pinPasswords)
                     putBoolean(KEY_USF_FINGERPRINT, usfFingerprint)
                 }
@@ -47,9 +56,11 @@ class CreateVolumeFragment: Fragment() {
     }
 
     private lateinit var binding: FragmentCreateVolumeBinding
-    private var themeValue = ConstValues.DEFAULT_THEME_VALUE
+    private lateinit var theme: Theme
+    private val volumeTypes = ArrayList<String>(2)
     private lateinit var volumePath: String
     private var isHiddenVolume: Boolean = false
+    private var rememberVolume: Boolean = false
     private var usfFingerprint: Boolean = false
     private lateinit var volumeDatabase: VolumeDatabase
     private var fingerprintProtector: FingerprintProtector? = null
@@ -66,19 +77,55 @@ class CreateVolumeFragment: Fragment() {
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         val pinPasswords = requireArguments().let { arguments ->
-            arguments.getString(KEY_THEME_VALUE)?.let { themeValue = it }
+            theme = Compat.getParcelable(arguments, KEY_THEME_VALUE)!!
             volumePath = arguments.getString(KEY_VOLUME_PATH)!!
             isHiddenVolume = arguments.getBoolean(KEY_IS_HIDDEN)
+            rememberVolume = arguments.getBoolean(KEY_REMEMBER_VOLUME)
             usfFingerprint = arguments.getBoolean(KEY_USF_FINGERPRINT)
             arguments.getBoolean(KEY_PIN_PASSWORDS)
         }
         volumeDatabase = VolumeDatabase(requireContext())
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
-            fingerprintProtector = FingerprintProtector.new(requireActivity(), themeValue, volumeDatabase)
+            fingerprintProtector = FingerprintProtector.new(requireActivity(), theme, volumeDatabase)
         }
-        if (!usfFingerprint || fingerprintProtector == null) {
+        if (!rememberVolume || !usfFingerprint || fingerprintProtector == null) {
             binding.checkboxSavePassword.visibility = View.GONE
         }
+        if (!BuildConfig.GOCRYPTFS_DISABLED) {
+            volumeTypes.add(resources.getString(R.string.gocryptfs))
+        }
+        if (!BuildConfig.CRYFS_DISABLED) {
+            volumeTypes.add(resources.getString(R.string.cryfs))
+        }
+        binding.spinnerVolumeType.adapter = ArrayAdapter(
+            requireContext(),
+            android.R.layout.simple_spinner_item,
+            volumeTypes
+        ).apply {
+            setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
+        }
+        val encryptionCipherAdapter = ArrayAdapter(
+            requireContext(),
+            android.R.layout.simple_spinner_item,
+            resources.getStringArray(R.array.gocryptfs_encryption_ciphers).toMutableList()
+        ).apply {
+            setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
+        }
+        binding.spinnerVolumeType.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
+            override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {
+                val ciphersArray = if (volumeTypes[position] == resources.getString(R.string.gocryptfs)) {
+                    R.array.gocryptfs_encryption_ciphers
+                } else {
+                    R.array.cryfs_encryption_ciphers
+                }
+                with(encryptionCipherAdapter) {
+                    clear()
+                    addAll(resources.getStringArray(ciphersArray).asList())
+                }
+            }
+            override fun onNothingSelected(parent: AdapterView<*>?) {}
+        }
+        binding.spinnerCipher.adapter = encryptionCipherAdapter
         if (pinPasswords) {
             arrayOf(binding.editPassword, binding.editPasswordConfirm).forEach {
                 it.inputType = InputType.TYPE_CLASS_NUMBER or InputType.TYPE_NUMBER_VARIATION_PASSWORD
@@ -88,24 +135,6 @@ class CreateVolumeFragment: Fragment() {
             createVolume()
             true
         }
-        binding.spinnerXchacha.adapter = ArrayAdapter(
-            requireContext(),
-            android.R.layout.simple_spinner_item,
-            resources.getStringArray(R.array.encryption_cipher)
-        ).apply {
-            setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
-        }
-        binding.spinnerXchacha.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
-            override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {
-                if (position == 1)
-                    CustomAlertDialogBuilder(requireContext(), themeValue)
-                        .setTitle(R.string.warning)
-                        .setMessage(R.string.xchacha_warning)
-                        .setPositiveButton(R.string.ok, null)
-                        .show()
-            }
-            override fun onNothingSelected(parent: AdapterView<*>?) {}
-        }
         binding.buttonCreate.setOnClickListener {
             createVolume()
         }
@@ -117,91 +146,127 @@ class CreateVolumeFragment: Fragment() {
     }
 
     private fun createVolume() {
-        val password = CharArray(binding.editPassword.text.length)
+        val password = UIUtils.encodeEditTextContent(binding.editPassword)
-        binding.editPassword.text.getChars(0, password.size, password, 0)
+        val passwordConfirm = UIUtils.encodeEditTextContent(binding.editPasswordConfirm)
-        val passwordConfirm = CharArray(binding.editPasswordConfirm.text.length)
-        binding.editPasswordConfirm.text.getChars(0, passwordConfirm.size, passwordConfirm, 0)
         if (!password.contentEquals(passwordConfirm)) {
             Toast.makeText(requireContext(), R.string.passwords_mismatch, Toast.LENGTH_SHORT).show()
-            Arrays.fill(password, 0.toChar())
+            Arrays.fill(password, 0)
-            Arrays.fill(passwordConfirm, 0.toChar())
+            Arrays.fill(passwordConfirm, 0)
         } else {
-            Arrays.fill(passwordConfirm, 0.toChar())
+            Arrays.fill(passwordConfirm, 0)
-            var returnedHash: ByteArray? = null
+            val returnedHash: ObjRef<ByteArray?>? = if (binding.checkboxSavePassword.isChecked) {
-            if (binding.checkboxSavePassword.isChecked)
+                ObjRef(null)
-                returnedHash = ByteArray(GocryptfsVolume.KeyLen)
+            } else {
-            object: LoadingTask<Volume?>(requireActivity() as AppCompatActivity, themeValue, R.string.loading_msg_create) {
+                null
-                override suspend fun doTask(): Volume? {
+            }
-                    val xchacha = when (binding.spinnerXchacha.selectedItemPosition) {
+            val encryptedVolume = ObjRef<EncryptedVolume?>(null)
-                        0 -> 0
+            object: LoadingTask<Byte>(requireActivity() as AppCompatActivity, theme, R.string.loading_msg_create) {
-                        1 -> 1
+                private fun generateResult(success: Boolean, volumeType: Byte): Byte {
-                        else -> -1
+                    return if (success) {
+                        volumeType
+                    } else {
+                        -1
                     }
+                }
+
+                override suspend fun doTask(): Byte {
                     val volumeFile = File(volumePath)
                     if (!volumeFile.exists())
                         volumeFile.mkdirs()
-                    val volume = if (GocryptfsVolume.createVolume(
+                    val result = if (volumeTypes[binding.spinnerVolumeType.selectedItemPosition] == resources.getString(R.string.gocryptfs)) {
+                        val xchacha = when (binding.spinnerCipher.selectedItemPosition) {
+                            0 -> 0
+                            1 -> 1
+                            else -> -1
+                        }
+                        generateResult(GocryptfsVolume.createAndOpenVolume(
                             volumePath,
                             password,
                             false,
                             xchacha,
-                            GocryptfsVolume.ScryptDefaultLogN,
+                            returnedHash?.apply {
-                            ConstValues.CREATOR,
+                                value = ByteArray(GocryptfsVolume.KeyLen)
-                            returnedHash
+                            }?.value,
-                        )
+                            encryptedVolume,
-                    ) {
+                        ), EncryptedVolume.GOCRYPTFS_VOLUME_TYPE)
-                        val volumeName = if (isHiddenVolume) File(volumePath).name else volumePath
-                        val volume = Volume(volumeName, isHiddenVolume)
-                        volumeDatabase.apply {
-                            if (isVolumeSaved(volumeName, isHiddenVolume)) // cleaning old saved path
-                                removeVolume(volumeName)
-                            saveVolume(volume)
-                        }
-                        volume
                     } else {
-                        null
+                        encryptedVolume.value = CryfsVolume.create(
+                            volumePath,
+                            CryfsVolume.getLocalStateDir(activity.filesDir.path),
+                            password,
+                            returnedHash,
+                            resources.getStringArray(R.array.cryfs_encryption_ciphers)[binding.spinnerCipher.selectedItemPosition],
+                        )
+                        generateResult(encryptedVolume.value != null, EncryptedVolume.CRYFS_VOLUME_TYPE)
                     }
-                    Arrays.fill(password, 0.toChar())
+                    Arrays.fill(password, 0)
-                    return volume
+                    return result
                 }
-            }.startTask(lifecycleScope) { volume ->
+            }.startTask(lifecycleScope) { result ->
-                if (volume == null) {
+                if (result.compareTo(-1) == 0) {
-                    CustomAlertDialogBuilder(requireContext(), themeValue)
+                    CustomAlertDialogBuilder(requireContext(), theme)
                         .setTitle(R.string.error)
                         .setMessage(R.string.create_volume_failed)
                         .setPositiveButton(R.string.ok, null)
                         .show()
                 } else {
+                    val volumeName = if (isHiddenVolume) File(volumePath).name else volumePath
+                    val volume = VolumeData(VolumeData.newUuid(), volumeName, isHiddenVolume, result)
+                    var isVolumeSaved = false
+                    volumeDatabase.apply {
+                        if (isVolumeSaved(volumeName, isHiddenVolume)) // cleaning old saved path
+                            removeVolume(volume)
+                        if (rememberVolume) {
+                            isVolumeSaved = saveVolume(volume)
+                        }
+                    }
+                    val volumeId = encryptedVolume.value?.let {
+                        (activity?.application as VolumeManagerApp).volumeManager.insert(it, volume)
+                    }
                     @SuppressLint("NewApi") // if fingerprintProtector is null checkboxSavePassword is hidden
-                    if (binding.checkboxSavePassword.isChecked && returnedHash != null) {
+                    if (isVolumeSaved && binding.checkboxSavePassword.isChecked && returnedHash != null) {
                         fingerprintProtector!!.let {
                             it.listener = object : FingerprintProtector.Listener {
                                 override fun onHashStorageReset() {
                                     hashStorageReset = true
                                     // retry
-                                    it.savePasswordHash(volume, returnedHash)
+                                    it.savePasswordHash(volume, returnedHash.value!!)
                                 }
                                 override fun onPasswordHashDecrypted(hash: ByteArray) {} // shouldn't happen here
                                 override fun onPasswordHashSaved() {
-                                    Arrays.fill(returnedHash, 0)
+                                    Arrays.fill(returnedHash.value!!, 0)
-                                    onVolumeCreated()
+                                    onVolumeCreated(volumeId, volume.shortName)
                                 }
                                 override fun onFailed(pending: Boolean) {
                                     if (!pending) {
-                                        Arrays.fill(returnedHash, 0)
+                                        Arrays.fill(returnedHash.value!!, 0)
-                                        onVolumeCreated()
+                                        onVolumeCreated(volumeId, volume.shortName)
                                     }
                                 }
                             }
-                            it.savePasswordHash(volume, returnedHash)
+                            it.savePasswordHash(volume, returnedHash.value!!)
                         }
-                    } else onVolumeCreated()
+                    } else {
+                        onVolumeCreated(volumeId, volume.shortName)
+                    }
                 }
             }
         }
     }
 
-    private fun onVolumeCreated() {
+    private fun onVolumeCreated(id: Int?, volumeShortName: String) {
-        (activity as AddVolumeActivity).onVolumeAdded(hashStorageReset)
+        (activity as AddVolumeActivity).apply {
+            if (id == null) {
+                finish()
+            } else {
+                startExplorer(id, volumeShortName)
+            }
+        }
+    }
+
+    override fun onStop() {
+        super.onStop()
+        binding.editPassword.text.clear()
+        binding.editPasswordConfirm.text.clear()
     }
 }

app/src/main/java/sushi/hardcore/droidfs/add_volume/SelectPathFragment.kt

@@ -2,23 +2,34 @@ package sushi.hardcore.droidfs.add_volume
 
 import android.Manifest
 import android.annotation.SuppressLint
+import android.content.Intent
+import android.content.SharedPreferences
 import android.content.pm.PackageManager
 import android.net.Uri
 import android.os.Build
 import android.os.Bundle
+import android.os.Environment
+import android.provider.Settings
 import android.text.Editable
 import android.text.TextWatcher
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import android.widget.TextView
 import android.widget.Toast
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.core.content.ContextCompat
 import androidx.fragment.app.Fragment
-import sushi.hardcore.droidfs.*
+import androidx.preference.PreferenceManager
+import sushi.hardcore.droidfs.Constants
+import sushi.hardcore.droidfs.R
+import sushi.hardcore.droidfs.Theme
+import sushi.hardcore.droidfs.VolumeData
+import sushi.hardcore.droidfs.VolumeDatabase
+import sushi.hardcore.droidfs.VolumeManagerApp
 import sushi.hardcore.droidfs.databinding.DialogSdcardErrorBinding
 import sushi.hardcore.droidfs.databinding.FragmentSelectPathBinding
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.util.Compat
 import sushi.hardcore.droidfs.util.PathUtils
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import java.io.File
@@ -26,11 +37,13 @@ import java.io.File
 class SelectPathFragment: Fragment() {
     companion object {
         private const val KEY_THEME_VALUE = "theme"
+        private const val KEY_PICK_MODE = "pick"
 
-        fun newInstance(themeValue: String): SelectPathFragment {
+        fun newInstance(theme: Theme, pickMode: Boolean): SelectPathFragment {
             return SelectPathFragment().apply {
                 arguments = Bundle().apply {
-                    putString(KEY_THEME_VALUE, themeValue)
+                    putParcelable(KEY_THEME_VALUE, theme)
+                    putBoolean(KEY_PICK_MODE, pickMode)
                 }
             }
         }
@@ -39,9 +52,9 @@ class SelectPathFragment: Fragment() {
     private lateinit var binding: FragmentSelectPathBinding
     private val askStoragePermissions = registerForActivityResult(ActivityResultContracts.RequestMultiplePermissions()) { result ->
         if (result[Manifest.permission.READ_EXTERNAL_STORAGE] == true && result[Manifest.permission.WRITE_EXTERNAL_STORAGE] == true)
-            PathUtils.safePickDirectory(pickDirectory, requireContext(), themeValue)
+            launchPickDirectory()
         else
-            CustomAlertDialogBuilder(requireContext(), themeValue)
+            CustomAlertDialogBuilder(requireContext(), theme)
                 .setTitle(R.string.storage_perm_denied)
                 .setMessage(R.string.storage_perm_denied_msg)
                 .setCancelable(false)
@@ -52,8 +65,15 @@ class SelectPathFragment: Fragment() {
         if (uri != null)
             onDirectoryPicked(uri)
     }
-    private var themeValue = ConstValues.DEFAULT_THEME_VALUE
+    private lateinit var app: VolumeManagerApp
+    private lateinit var theme: Theme
     private lateinit var volumeDatabase: VolumeDatabase
+    private lateinit var filesDir: String
+    private lateinit var sharedPrefs: SharedPreferences
+    private var pickMode = false
+    private var originalRememberVolume = true
+    private var currentVolumeData: VolumeData? = null
+    private var volumeAction: Action? = null
 
     override fun onCreateView(
         inflater: LayoutInflater,
@@ -65,65 +85,68 @@ class SelectPathFragment: Fragment() {
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        app = requireActivity().application as VolumeManagerApp
+        sharedPrefs = PreferenceManager.getDefaultSharedPreferences(requireContext())
+        originalRememberVolume = sharedPrefs.getBoolean(Constants.REMEMBER_VOLUME_KEY, true)
+        binding.switchRemember.isChecked = originalRememberVolume
         arguments?.let { arguments ->
-            arguments.getString(KEY_THEME_VALUE)?.let { themeValue = it }
+            theme = Compat.getParcelable(arguments, KEY_THEME_VALUE)!!
+            pickMode = arguments.getBoolean(KEY_PICK_MODE)
+        }
+        if (pickMode) {
+            binding.buttonAction.text = getString(R.string.add_volume)
         }
         volumeDatabase = VolumeDatabase(requireContext())
+        filesDir = requireContext().filesDir.path
         binding.containerHiddenVolume.setOnClickListener {
             binding.switchHiddenVolume.performClick()
         }
         binding.switchHiddenVolume.setOnClickListener {
             showRightSection()
+            refreshStatus(binding.editVolumeName.text)
         }
         binding.buttonPickDirectory.setOnClickListener {
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
-                if (ContextCompat.checkSelfPermission(
+                if (Environment.isExternalStorageManager()) {
+                    launchPickDirectory()
+                } else {
+                    app.isStartingExternalApp = true
+                    startActivity(Intent(Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION, Uri.parse("package:"+requireContext().packageName)))
+                }
+            } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+                if (
+                    ContextCompat.checkSelfPermission(
                         requireContext(),
                         Manifest.permission.READ_EXTERNAL_STORAGE
-                    ) +
+                    ) + ContextCompat.checkSelfPermission(
-                    ContextCompat.checkSelfPermission(
                         requireContext(),
                         Manifest.permission.WRITE_EXTERNAL_STORAGE
                     ) == PackageManager.PERMISSION_GRANTED
-                )
+                ) {
-                    PathUtils.safePickDirectory(pickDirectory, requireContext(), themeValue)
+                    launchPickDirectory()
-                else
+                } else {
+                    app.isStartingExternalApp = true
                     askStoragePermissions.launch(
                         arrayOf(
                             Manifest.permission.READ_EXTERNAL_STORAGE,
                             Manifest.permission.WRITE_EXTERNAL_STORAGE
                         )
                     )
-            } else
+                }
-                PathUtils.safePickDirectory(pickDirectory, requireContext(), themeValue)
+            } else {
+                launchPickDirectory()
+            }
         }
-        var isVolumeAlreadySaved = false
-        var volumeAction: Action? = null
         binding.editVolumeName.addTextChangedListener(object: TextWatcher {
             override fun afterTextChanged(s: Editable?) {}
             override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}
-            override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
+            override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {
-                isVolumeAlreadySaved = volumeDatabase.isVolumeSaved(s.toString(), binding.switchHiddenVolume.isChecked)
+                refreshStatus(s)
-                if (isVolumeAlreadySaved)
-                    binding.textWarning.apply {
-                        text = getString(R.string.volume_alread_saved)
-                        visibility = View.VISIBLE
-                    }
-                else
-                    binding.textWarning.visibility = View.GONE
-                val path = File(getCurrentVolumePath())
-                volumeAction = if (path.isDirectory)
-                    if (path.list()?.isEmpty() == true) Action.CREATE else Action.ADD
-                else
-                    Action.CREATE
-                binding.buttonAction.text = getString(when (volumeAction) {
-                    Action.CREATE -> R.string.create
-                    else -> R.string.add_volume
-                })
             }
         })
-        binding.editVolumeName.setOnEditorActionListener { _, _, _ -> onPathSelected(isVolumeAlreadySaved, volumeAction); true }
+        binding.switchRemember.setOnCheckedChangeListener { _, _ -> refreshButtonText() }
-        binding.buttonAction.setOnClickListener { onPathSelected(isVolumeAlreadySaved, volumeAction) }
+        binding.editVolumeName.setOnEditorActionListener { _, _, _ -> onPathSelected(); true }
+        binding.buttonAction.setOnClickListener { onPathSelected() }
     }
 
     override fun onViewStateRestored(savedInstanceState: Bundle?) {
@@ -132,6 +155,11 @@ class SelectPathFragment: Fragment() {
         showRightSection()
     }
 
+    private fun launchPickDirectory() {
+        app.isStartingExternalApp = true
+        PathUtils.safePickDirectory(pickDirectory, requireContext(), theme)
+    }
+
     private fun showRightSection() {
         if (binding.switchHiddenVolume.isChecked) {
             binding.textLabel.text = requireContext().getString(R.string.volume_name_label)
@@ -144,12 +172,54 @@ class SelectPathFragment: Fragment() {
         }
     }
 
+    private fun refreshButtonText() {
+        binding.buttonAction.text = getString(
+            if (pickMode || volumeAction == Action.ADD) {
+                if (binding.switchRemember.isChecked || currentVolumeData != null) {
+                    R.string.add_volume
+                } else {
+                    R.string.open_volume
+                }
+            } else {
+                R.string.create_volume
+            }
+        )
+    }
+
+    private fun refreshStatus(content: CharSequence) {
+        val path = File(getCurrentVolumePath())
+        volumeAction = if (path.isDirectory) {
+            if (path.list()?.isEmpty() == true || content.isEmpty()) Action.CREATE else Action.ADD
+        } else {
+            Action.CREATE
+        }
+        currentVolumeData = if (volumeAction == Action.CREATE) {
+            null
+        } else {
+            volumeDatabase.getVolume(content.toString(), binding.switchHiddenVolume.isChecked)
+        }
+        binding.textWarning.visibility = if (volumeAction == Action.CREATE && pickMode) {
+            binding.textWarning.text = getString(R.string.choose_existing_volume)
+            binding.buttonAction.isEnabled = false
+            View.VISIBLE
+        } else {
+            refreshButtonText()
+            binding.buttonAction.isEnabled = true
+            if (currentVolumeData == null) {
+                View.GONE
+            } else {
+                binding.textWarning.text = getString(R.string.volume_alread_saved)
+                View.VISIBLE
+            }
+        }
+    }
+
     private fun onDirectoryPicked(uri: Uri) {
         val path = PathUtils.getFullPathFromTreeUri(uri, requireContext())
         if (path != null)
             binding.editVolumeName.setText(path)
         else
-            CustomAlertDialogBuilder(requireContext(), themeValue)
+            CustomAlertDialogBuilder(requireContext(), theme)
                 .setTitle(R.string.error)
                 .setMessage(R.string.path_error)
                 .setPositiveButton(R.string.ok, null)
@@ -158,94 +228,105 @@ class SelectPathFragment: Fragment() {
 
     private fun getCurrentVolumePath(): String {
         return if (binding.switchHiddenVolume.isChecked)
-            PathUtils.pathJoin(requireContext().filesDir.path, binding.editVolumeName.text.toString())
+            VolumeData.getHiddenVolumeFullPath(filesDir, binding.editVolumeName.text.toString())
         else
             binding.editVolumeName.text.toString()
     }
 
-    private fun onPathSelected(isVolumeAlreadySaved: Boolean, volumeAction: Action?) {
+    private fun onPathSelected() {
-        if (isVolumeAlreadySaved) {
+        if (binding.switchRemember.isChecked != originalRememberVolume) {
-            (activity as AddVolumeActivity).onSelectedAlreadySavedVolume()
+            with(sharedPrefs.edit()) {
-        } else {
+                putBoolean(Constants.REMEMBER_VOLUME_KEY, binding.switchRemember.isChecked)
-            if (binding.switchHiddenVolume.isChecked && volumeAction == Action.CREATE) {
+                apply()
-                CustomAlertDialogBuilder(requireContext(), themeValue)
+            }
+        }
+        if (currentVolumeData == null) { // volume not known
+            val currentVolumeValue = binding.editVolumeName.text.toString()
+            val isHidden = binding.switchHiddenVolume.isChecked
+            if (currentVolumeValue.isEmpty()) {
+                Toast.makeText(
+                    requireContext(),
+                    if (isHidden) R.string.enter_volume_name else R.string.enter_volume_path,
+                    Toast.LENGTH_SHORT
+                ).show()
+            } else if (isHidden && currentVolumeValue.contains(PathUtils.SEPARATOR)) {
+                Toast.makeText(requireContext(), R.string.error_slash_in_name, Toast.LENGTH_SHORT).show()
+            } else if (isHidden && volumeAction == Action.CREATE) {
+                CustomAlertDialogBuilder(requireContext(), theme)
                     .setTitle(R.string.warning)
                     .setMessage(R.string.hidden_volume_warning)
                     .setPositiveButton(R.string.ok) { _, _ ->
-                        addVolume(volumeAction)
+                        onNewVolumeSelected(currentVolumeValue, isHidden)
                     }
                     .show()
             } else {
-                addVolume(volumeAction)
+                onNewVolumeSelected(currentVolumeValue, isHidden)
             }
+        } else {
+            (activity as AddVolumeActivity).onVolumeSelected(currentVolumeData!!, true)
         }
     }
 
-    private fun addVolume(volumeAction: Action?) {
+    private fun onNewVolumeSelected(currentVolumeValue: String, isHidden: Boolean) {
-        val currentVolumeValue = binding.editVolumeName.text.toString()
+        val volumePath = getCurrentVolumePath()
-        val isHidden = binding.switchHiddenVolume.isChecked
+        when (volumeAction!!) {
-        if (currentVolumeValue.isEmpty()) {
+            Action.CREATE -> {
-            Toast.makeText(
+                val volumeFile = File(volumePath)
-                requireContext(),
+                var goodDirectory = false
-                if (isHidden) R.string.enter_volume_name else R.string.enter_volume_path,
+                if (volumeFile.isFile) {
-                Toast.LENGTH_SHORT
+                    Toast.makeText(requireContext(), R.string.error_is_file, Toast.LENGTH_SHORT).show()
-            ).show()
+                } else if (volumeFile.isDirectory) {
-        } else if (isHidden && currentVolumeValue.contains("/")) {
+                    val dirContent = volumeFile.list()
-            Toast.makeText(requireContext(), R.string.error_slash_in_name, Toast.LENGTH_SHORT).show()
+                    if (dirContent != null) {
-        } else {
+                        if (dirContent.isEmpty()) {
-            val volumePath = getCurrentVolumePath()
+                            if (volumeFile.canWrite()) {
-            when (volumeAction!!) {
+                                goodDirectory = true
-                Action.CREATE -> {
+                            } else {
-                    val volumeFile = File(volumePath)
+                                errorDirectoryNotWritable(volumePath)
-                    var goodDirectory = false
+                            }
-                    if (volumeFile.isFile) {
+                        } else {
-                        Toast.makeText(requireContext(), R.string.error_is_file, Toast.LENGTH_SHORT).show()
+                            Toast.makeText(requireContext(), R.string.dir_not_empty, Toast.LENGTH_SHORT).show()
-                    } else if (volumeFile.isDirectory) {
+                        }
-                        val dirContent = volumeFile.list()
-                        if (dirContent != null) {
-                            if (dirContent.isEmpty()) {
-                                if (volumeFile.canWrite())
-                                    goodDirectory = true
-                                else
-                                    errorDirectoryNotWritable(volumePath)
-                            } else
-                                Toast.makeText(requireContext(), R.string.dir_not_empty, Toast.LENGTH_SHORT).show()
-                        } else
-                            Toast.makeText(requireContext(), R.string.listdir_null_error_msg, Toast.LENGTH_SHORT).show()
                     } else {
-                        if (File(PathUtils.getParentPath(volumePath)).canWrite())
+                        Toast.makeText(requireContext(), R.string.listdir_null_error_msg, Toast.LENGTH_SHORT).show()
-                            goodDirectory = true
+                    }
-                        else
+                } else {
-                            errorDirectoryNotWritable(volumePath)
+                    if (File(PathUtils.getParentPath(volumePath)).canWrite()) {
+                        goodDirectory = true
+                    } else {
+                        errorDirectoryNotWritable(volumePath)
                     }
-                    if (goodDirectory)
-                        (activity as AddVolumeActivity).createVolume(volumePath, isHidden)
                 }
-                Action.ADD -> {
+                if (goodDirectory) {
-                    if (!GocryptfsVolume.isGocryptfsVolume(File(volumePath))) {
+                    (activity as AddVolumeActivity).createVolume(volumePath, isHidden, binding.switchRemember.isChecked)
-                        CustomAlertDialogBuilder(requireContext(), themeValue)
+                }
-                            .setTitle(R.string.error)
+            }
-                            .setMessage(R.string.error_not_a_volume)
+            Action.ADD -> {
-                            .setPositiveButton(R.string.ok, null)
+                val volumeType = EncryptedVolume.getVolumeType(volumePath)
-                            .show()
+                if (volumeType < 0) {
-                    } else if (!File(volumePath).canWrite()) {
+                    CustomAlertDialogBuilder(requireContext(), theme)
-                        val dialog = CustomAlertDialogBuilder(requireContext(), themeValue)
+                        .setTitle(R.string.error)
-                            .setTitle(R.string.warning)
+                        .setMessage(R.string.error_not_a_volume)
-                            .setCancelable(false)
+                        .setPositiveButton(R.string.ok, null)
-                            .setPositiveButton(R.string.ok) { _, _ -> addVolume(if (isHidden) currentVolumeValue else volumePath, isHidden) }
+                        .show()
-                        if (PathUtils.isPathOnExternalStorage(volumePath, requireContext()))
+                } else if (!File(volumePath).canWrite()) {
-                            dialog.setView(
+                    val dialog = CustomAlertDialogBuilder(requireContext(), theme)
-                                DialogSdcardErrorBinding.inflate(layoutInflater).apply {
+                        .setTitle(R.string.warning)
-                                    path.text = PathUtils.getPackageDataFolder(requireContext())
+                        .setCancelable(false)
-                                    footer.text = getString(R.string.sdcard_error_add_footer)
+                        .setPositiveButton(R.string.ok) { _, _ -> addVolume(if (isHidden) currentVolumeValue else volumePath, isHidden, volumeType) }
-                                }.root
+                    if (PathUtils.isPathOnExternalStorage(volumePath, requireContext())) {
-                            )
+                        dialog.setView(
-                        else
+                            DialogSdcardErrorBinding.inflate(layoutInflater).apply {
-                            dialog.setMessage(R.string.add_cant_write_warning)
+                                path.text = PathUtils.getPackageDataFolder(requireContext())
-                        dialog.show()
+                                footer.text = getString(R.string.sdcard_error_add_footer)
+                            }.root
+                        )
                     } else {
-                        addVolume(if (isHidden) currentVolumeValue else volumePath, isHidden)
+                        dialog.setMessage(R.string.add_cant_write_warning)
                     }
+                    dialog.show()
+                } else {
+                    addVolume(if (isHidden) currentVolumeValue else volumePath, isHidden, volumeType)
                 }
             }
         }
@@ -253,7 +334,7 @@ class SelectPathFragment: Fragment() {
 
     // called when the user tries to create a volume in a non-writable directory
     private fun errorDirectoryNotWritable(volumePath: String) {
-        val dialog = CustomAlertDialogBuilder(requireContext(), themeValue)
+        val dialog = CustomAlertDialogBuilder(requireContext(), theme)
             .setTitle(R.string.error)
             .setPositiveButton(R.string.ok, null)
         @SuppressLint("InflateParams")
@@ -268,8 +349,11 @@ class SelectPathFragment: Fragment() {
         dialog.show()
     }
 
-    private fun addVolume(volumeName: String, isHidden: Boolean) {
+    private fun addVolume(volumeName: String, isHidden: Boolean, volumeType: Byte) {
-        volumeDatabase.saveVolume(Volume(volumeName, isHidden))
+        val volumeData = VolumeData(VolumeData.newUuid(), volumeName, isHidden, volumeType)
-        (activity as AddVolumeActivity).onVolumeAdded(false)
+        if (binding.switchRemember.isChecked) {
+            volumeDatabase.saveVolume(volumeData)
+        }
+        (activity as AddVolumeActivity).onVolumeSelected(volumeData, binding.switchRemember.isChecked)
     }
 }

app/src/main/java/sushi/hardcore/droidfs/content_providers/ExternalProvider.kt

@@ -1,122 +0,0 @@
-package sushi.hardcore.droidfs.content_providers
-
-import android.content.Context
-import android.content.Intent
-import android.net.Uri
-import android.webkit.MimeTypeMap
-import androidx.appcompat.app.AppCompatActivity
-import androidx.lifecycle.lifecycleScope
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.GlobalScope
-import kotlinx.coroutines.launch
-import sushi.hardcore.droidfs.GocryptfsVolume
-import sushi.hardcore.droidfs.LoadingTask
-import sushi.hardcore.droidfs.R
-import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
-import java.io.File
-
-object ExternalProvider {
-    private const val content_type_all = "*/*"
-    private var storedFiles = HashSet<Uri>()
-    private fun getContentType(filename: String, previous_content_type: String?): String {
-        if (content_type_all != previous_content_type) {
-            var contentType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(File(filename).extension)
-            if (contentType == null) {
-                contentType = content_type_all
-            }
-            if (previous_content_type == null) {
-                return contentType
-            } else if (previous_content_type != contentType) {
-                return content_type_all
-            }
-        }
-        return previous_content_type
-    }
-
-    private fun exportFile(context: Context, gocryptfsVolume: GocryptfsVolume, file_path: String, previous_content_type: String?): Pair<Uri?, String?> {
-        val fileName = File(file_path).name
-        val tmpFileUri = RestrictedFileProvider.newFile(fileName)
-        if (tmpFileUri != null){
-            storedFiles.add(tmpFileUri)
-            if (gocryptfsVolume.exportFile(context, file_path, tmpFileUri)) {
-                return Pair(tmpFileUri, getContentType(fileName, previous_content_type))
-            }
-        }
-        return Pair(null, null)
-    }
-
-    fun share(activity: AppCompatActivity, themeValue: String, gocryptfsVolume: GocryptfsVolume, file_paths: List<String>) {
-        var contentType: String? = null
-        val uris = ArrayList<Uri>(file_paths.size)
-        object : LoadingTask<String?>(activity, themeValue, R.string.loading_msg_export) {
-            override suspend fun doTask(): String? {
-                for (path in file_paths) {
-                    val result = exportFile(activity, gocryptfsVolume, path, contentType)
-                    contentType = if (result.first != null) {
-                        uris.add(result.first!!)
-                        result.second
-                    } else {
-                        return path
-                    }
-                }
-                return null
-            }
-        }.startTask(activity.lifecycleScope) { failedItem ->
-            if (failedItem == null) {
-                val shareIntent = Intent()
-                shareIntent.type = contentType
-                if (uris.size == 1) {
-                    shareIntent.action = Intent.ACTION_SEND
-                    shareIntent.putExtra(Intent.EXTRA_STREAM, uris[0])
-                } else {
-                    shareIntent.action = Intent.ACTION_SEND_MULTIPLE
-                    shareIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris)
-                }
-                activity.startActivity(Intent.createChooser(shareIntent, activity.getString(R.string.share_chooser)))
-            } else {
-                CustomAlertDialogBuilder(activity, themeValue)
-                    .setTitle(R.string.error)
-                    .setMessage(activity.getString(R.string.export_failed, failedItem))
-                    .setPositiveButton(R.string.ok, null)
-                    .show()
-            }
-        }
-    }
-
-    fun open(activity: AppCompatActivity, themeValue: String, gocryptfsVolume: GocryptfsVolume, file_path: String) {
-        object : LoadingTask<Intent?>(activity, themeValue, R.string.loading_msg_export) {
-            override suspend fun doTask(): Intent? {
-                val result = exportFile(activity, gocryptfsVolume, file_path, null)
-                return if (result.first != null) {
-                    Intent(Intent.ACTION_VIEW).apply {
-                        setDataAndType(result.first, result.second)
-                    }
-                } else {
-                    null
-                }
-            }
-        }.startTask(activity.lifecycleScope) { openIntent ->
-            if (openIntent == null) {
-                CustomAlertDialogBuilder(activity, themeValue)
-                    .setTitle(R.string.error)
-                    .setMessage(activity.getString(R.string.export_failed, file_path))
-                    .setPositiveButton(R.string.ok, null)
-                    .show()
-            } else {
-                activity.startActivity(openIntent)
-            }
-        }
-    }
-
-    fun removeFilesAsync(context: Context) = GlobalScope.launch(Dispatchers.IO) {
-        val success = HashSet<Uri>(storedFiles.size)
-        for (uri in storedFiles) {
-            if (context.contentResolver.delete(uri, null, null) == 1) {
-                success.add(uri)
-            }
-        }
-        for (uri in success) {
-            storedFiles.remove(uri)
-        }
-    }
-}

app/src/main/java/sushi/hardcore/droidfs/content_providers/RestrictedFileProvider.kt

@@ -1,194 +0,0 @@
-package sushi.hardcore.droidfs.content_providers
-
-import android.content.ContentProvider
-import android.content.ContentValues
-import android.content.Context
-import android.database.Cursor
-import android.database.MatrixCursor
-import android.database.sqlite.SQLiteDatabase
-import android.database.sqlite.SQLiteOpenHelper
-import android.net.Uri
-import android.os.ParcelFileDescriptor
-import android.provider.MediaStore
-import sushi.hardcore.droidfs.BuildConfig
-import sushi.hardcore.droidfs.util.SQLUtil.appendSelectionArgs
-import sushi.hardcore.droidfs.util.SQLUtil.concatenateWhere
-import sushi.hardcore.droidfs.util.Wiper
-import java.io.File
-import java.util.*
-import java.util.regex.Pattern
-
-class RestrictedFileProvider: ContentProvider() {
-    companion object {
-        private const val DB_NAME = "temporary_files.db"
-        private const val TABLE_FILES = "files"
-        private const val DB_VERSION = 3
-        private var dbHelper: RestrictedDatabaseHelper? = null
-        private const val AUTHORITY = BuildConfig.APPLICATION_ID + ".temporary_provider"
-        private val CONTENT_URI: Uri = Uri.parse("content://$AUTHORITY")
-        const val TEMPORARY_FILES_DIR_NAME = "temp"
-        private val UUID_PATTERN = Pattern.compile("[a-fA-F0-9-]+")
-
-        private lateinit var tempFilesDir: File
-
-        internal class TemporaryFileColumns {
-            companion object {
-                const val COLUMN_UUID = "uuid"
-                const val COLUMN_NAME = "name"
-            }
-        }
-
-        internal class RestrictedDatabaseHelper(context: Context?): SQLiteOpenHelper(context, DB_NAME, null, DB_VERSION) {
-            override fun onCreate(db: SQLiteDatabase) {
-                db.execSQL(
-                    "CREATE TABLE IF NOT EXISTS " + TABLE_FILES + " (" +
-                            TemporaryFileColumns.COLUMN_UUID + " TEXT PRIMARY KEY, " +
-                            TemporaryFileColumns.COLUMN_NAME + " TEXT" +
-                            ");"
-                )
-            }
-
-            override fun onUpgrade(db: SQLiteDatabase, oldVersion: Int, newVersion: Int) {
-                if (oldVersion == 1) {
-                    db.execSQL("DROP TABLE IF EXISTS files")
-                    db.execSQL(
-                        "CREATE TABLE IF NOT EXISTS " + TABLE_FILES + " (" +
-                                TemporaryFileColumns.COLUMN_UUID + " TEXT PRIMARY KEY, " +
-                                TemporaryFileColumns.COLUMN_NAME + " TEXT" +
-                                ");"
-                    )
-                }
-            }
-        }
-
-        fun newFile(fileName: String): Uri? {
-            val uuid = UUID.randomUUID().toString()
-            val file = File(tempFilesDir, uuid)
-            return if (file.createNewFile()){
-                val contentValues = ContentValues()
-                contentValues.put(TemporaryFileColumns.COLUMN_UUID, uuid)
-                contentValues.put(TemporaryFileColumns.COLUMN_NAME, fileName)
-                if (dbHelper?.writableDatabase?.insert(TABLE_FILES, null, contentValues)?.toInt() != -1){
-                    Uri.withAppendedPath(CONTENT_URI, uuid)
-                } else {
-                    null
-                }
-            } else {
-                null
-            }
-        }
-
-        fun wipeAll(context: Context) {
-            tempFilesDir.listFiles()?.let{
-                for (file in it) {
-                    Wiper.wipe(file)
-                }
-            }
-            dbHelper?.close()
-            context.deleteDatabase(DB_NAME)
-        }
-
-        private fun isValidUUID(uuid: String): Boolean {
-            return UUID_PATTERN.matcher(uuid).matches()
-        }
-
-        private fun getUuidFromUri(uri: Uri): String? {
-            val uuid = uri.lastPathSegment
-            if (uuid != null) {
-                if (isValidUUID(uuid)) {
-                    return uuid
-                }
-            }
-            return null
-        }
-
-        private fun getFileFromUUID(uuid: String): File? {
-            if (isValidUUID(uuid)){
-                return File(tempFilesDir, uuid)
-            }
-            return null
-        }
-
-        private fun getFileFromUri(uri: Uri): File? {
-            getUuidFromUri(uri)?.let {
-                return getFileFromUUID(it)
-            }
-            return null
-        }
-    }
-
-    override fun onCreate(): Boolean {
-        context?.let {
-            dbHelper = RestrictedDatabaseHelper(it)
-            tempFilesDir = File(it.cacheDir, TEMPORARY_FILES_DIR_NAME)
-            return tempFilesDir.mkdirs()
-        }
-        return false
-    }
-
-    override fun insert(uri: Uri, values: ContentValues?): Uri? {
-        throw RuntimeException("Operation not supported")
-    }
-
-    override fun update(uri: Uri, values: ContentValues?, selection: String?, selectionArgs: Array<String>?): Int {
-        throw RuntimeException("Operation not supported")
-    }
-
-    override fun query(uri: Uri, projection: Array<String>?, selection: String?, selectionArgs: Array<String>?, sortOrder: String?): Cursor? {
-        var resultCursor: MatrixCursor? = null
-        val temporaryFile = getFileFromUri(uri)
-        temporaryFile?.let{
-            val fileName = dbHelper?.readableDatabase?.query(TABLE_FILES, arrayOf(TemporaryFileColumns.COLUMN_NAME), TemporaryFileColumns.COLUMN_UUID + "=?", arrayOf(uri.lastPathSegment), null, null, null)
-            fileName?.let{
-                if (fileName.moveToNext()) {
-                    resultCursor = MatrixCursor(
-                        arrayOf(
-                            MediaStore.MediaColumns.DISPLAY_NAME,
-                            MediaStore.MediaColumns.SIZE
-                        )
-                    )
-                    resultCursor!!.newRow()
-                        .add(fileName.getString(0))
-                        .add(temporaryFile.length())
-                }
-                fileName.close()
-            }
-        }
-        return resultCursor
-    }
-
-    override fun delete(uri: Uri, givenSelection: String?, givenSelectionArgs: Array<String>?): Int {
-        val uuid = getUuidFromUri(uri)
-        uuid?.let{
-            val selection = concatenateWhere(givenSelection ?: "" , TemporaryFileColumns.COLUMN_UUID + "=?")
-            val selectionArgs = appendSelectionArgs(givenSelectionArgs, arrayOf(it))
-
-            val files = dbHelper?.readableDatabase?.query(TABLE_FILES, arrayOf(TemporaryFileColumns.COLUMN_UUID), selection, selectionArgs, null, null, null)
-            if (files != null) {
-                while (files.moveToNext()) {
-                    getFileFromUUID(files.getString(0))?.let { file ->
-                        Wiper.wipe(file)
-                    }
-                }
-                files.close()
-                return dbHelper?.writableDatabase?.delete(TABLE_FILES, selection, selectionArgs) ?: 0
-            }
-        }
-        return 0
-    }
-
-    override fun getType(uri: Uri): String {
-        return "application/octet-stream"
-    }
-
-    override fun openFile(uri: Uri, mode: String): ParcelFileDescriptor? {
-        if (("w" in mode && callingPackage == BuildConfig.APPLICATION_ID) || "w" !in mode) {
-            getFileFromUri(uri)?.let{
-                return ParcelFileDescriptor.open(it, ParcelFileDescriptor.parseMode(mode))
-            }
-        } else {
-            throw SecurityException("Read-only access")
-        }
-        return null
-    }
-}

app/src/main/java/sushi/hardcore/droidfs/content_providers/TemporaryFileProvider.kt

@@ -0,0 +1,147 @@
+package sushi.hardcore.droidfs.content_providers
+
+import android.content.ContentProvider
+import android.content.ContentValues
+import android.content.Intent
+import android.database.Cursor
+import android.database.MatrixCursor
+import android.net.Uri
+import android.os.ParcelFileDescriptor
+import android.provider.OpenableColumns
+import android.util.Log
+import android.webkit.MimeTypeMap
+import androidx.preference.PreferenceManager
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
+import sushi.hardcore.droidfs.BuildConfig
+import sushi.hardcore.droidfs.EncryptedFileProvider
+import sushi.hardcore.droidfs.VolumeManager
+import sushi.hardcore.droidfs.VolumeManagerApp
+import sushi.hardcore.droidfs.util.Wiper
+import java.io.File
+import java.util.UUID
+
+class TemporaryFileProvider : ContentProvider() {
+    private inner class ProvidedFile(
+        val file: EncryptedFileProvider.ExportedFile,
+        val size: Long,
+        val volumeId: Int
+    )
+
+    companion object {
+        private const val TAG = "TemporaryFileProvider"
+        private const val AUTHORITY = BuildConfig.APPLICATION_ID + ".temporary_provider"
+        private val BASE_URI: Uri = Uri.parse("content://$AUTHORITY")
+
+        lateinit var instance: TemporaryFileProvider
+            private set
+        var usfSafWrite = false
+    }
+
+    private lateinit var volumeManager: VolumeManager
+    lateinit var encryptedFileProvider: EncryptedFileProvider
+    private val files = HashMap<Uri, ProvidedFile>()
+
+    override fun onCreate(): Boolean {
+        return context?.let {
+            volumeManager = (it.applicationContext as VolumeManagerApp).volumeManager
+            usfSafWrite =
+                PreferenceManager.getDefaultSharedPreferences(it).getBoolean("usf_saf_write", false)
+            encryptedFileProvider = EncryptedFileProvider(it)
+            instance = this
+            val tmpFilesDir = EncryptedFileProvider.getTmpFilesDir(it)
+            val success = tmpFilesDir.mkdirs()
+            // wipe any additional files not previously deleted
+            GlobalScope.launch(Dispatchers.IO) {
+                tmpFilesDir.listFiles()?.onEach { f -> Wiper.wipe(f) }
+            }
+            success
+        } ?: false
+    }
+
+    fun exportFile(
+        exportedFile: EncryptedFileProvider.ExportedFile,
+        size: Long,
+        volumeId: Int
+    ): Uri? {
+        if (!encryptedFileProvider.exportFile(exportedFile, volumeManager.getVolume(volumeId)!!)) {
+            return null
+        }
+        return Uri.withAppendedPath(BASE_URI, UUID.randomUUID().toString()).also {
+            files[it] = ProvidedFile(exportedFile, size, volumeId)
+        }
+    }
+
+    override fun query(
+        uri: Uri,
+        projection: Array<String>?,
+        selection: String?,
+        selectionArgs: Array<String>?,
+        sortOrder: String?
+    ): Cursor? {
+        val file = files[uri] ?: return null
+        return MatrixCursor(arrayOf(OpenableColumns.DISPLAY_NAME, OpenableColumns.SIZE), 1).apply {
+            addRow(arrayOf(File(file.file.path).name, file.size))
+        }
+    }
+
+    override fun insert(uri: Uri, values: ContentValues?): Uri? {
+        throw UnsupportedOperationException("Operation not supported")
+    }
+
+    override fun update(
+        uri: Uri,
+        values: ContentValues?,
+        selection: String?,
+        selectionArgs: Array<String>?
+    ): Int {
+        throw UnsupportedOperationException("Operation not supported")
+    }
+
+    override fun delete(uri: Uri, selection: String?, selectionArgs: Array<out String>?): Int {
+        return if (files.remove(uri)?.file?.also { it.free() } == null) 0 else 1
+    }
+
+    override fun getType(uri: Uri): String = files[uri]?.file?.path?.let {
+        MimeTypeMap.getSingleton().getMimeTypeFromExtension(File(it).extension)
+    } ?: "application/octet-stream"
+
+    override fun openFile(uri: Uri, mode: String): ParcelFileDescriptor? {
+        files[uri]?.let { file ->
+            val encryptedVolume = volumeManager.getVolume(file.volumeId) ?: run {
+                Log.e(TAG, "Volume closed for $uri")
+                return null
+            }
+            val result = encryptedFileProvider.openFile(
+                file.file,
+                mode,
+                encryptedVolume,
+                volumeManager.getCoroutineScope(file.volumeId),
+                false,
+                usfSafWrite,
+            )
+            when (result.second) {
+                EncryptedFileProvider.Error.SUCCESS -> return result.first!!
+                EncryptedFileProvider.Error.WRITE_ACCESS_DENIED -> Log.e(
+                    TAG,
+                    "Unauthorized write access requested from $callingPackage to $uri"
+                )
+
+                else -> result.second.log()
+            }
+        }
+        return null
+    }
+
+    // this must not be cancelled
+    fun wipe() = GlobalScope.launch(Dispatchers.IO) {
+        context!!.revokeUriPermission(BASE_URI, Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
+        synchronized(this@TemporaryFileProvider) {
+            for (i in files.values) {
+                i.file.free()
+            }
+            files.clear()
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/content_providers/VolumeProvider.kt

@@ -0,0 +1,293 @@
+package sushi.hardcore.droidfs.content_providers
+
+import android.content.Context
+import android.database.Cursor
+import android.database.MatrixCursor
+import android.os.CancellationSignal
+import android.os.ParcelFileDescriptor
+import android.provider.DocumentsContract
+import android.provider.DocumentsProvider
+import android.util.Log
+import android.webkit.MimeTypeMap
+import androidx.preference.PreferenceManager
+import sushi.hardcore.droidfs.BuildConfig
+import sushi.hardcore.droidfs.EncryptedFileProvider
+import sushi.hardcore.droidfs.R
+import sushi.hardcore.droidfs.VolumeData
+import sushi.hardcore.droidfs.VolumeManager
+import sushi.hardcore.droidfs.VolumeManagerApp
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.filesystems.Stat
+import sushi.hardcore.droidfs.util.PathUtils
+import java.io.File
+
+class VolumeProvider: DocumentsProvider() {
+    companion object {
+        private const val TAG = "DocumentsProvider"
+        private const val AUTHORITY = BuildConfig.APPLICATION_ID + ".volume_provider"
+        private val DEFAULT_ROOT_PROJECTION = arrayOf(
+            DocumentsContract.Root.COLUMN_ROOT_ID,
+            DocumentsContract.Root.COLUMN_FLAGS,
+            DocumentsContract.Root.COLUMN_ICON,
+            DocumentsContract.Root.COLUMN_TITLE,
+            DocumentsContract.Root.COLUMN_DOCUMENT_ID,
+        )
+        private val DEFAULT_DOCUMENT_PROJECTION = arrayOf(
+            DocumentsContract.Document.COLUMN_DOCUMENT_ID,
+            DocumentsContract.Document.COLUMN_DISPLAY_NAME,
+            DocumentsContract.Document.COLUMN_MIME_TYPE,
+            DocumentsContract.Document.COLUMN_FLAGS,
+            DocumentsContract.Document.COLUMN_SIZE,
+            DocumentsContract.Document.COLUMN_LAST_MODIFIED,
+        )
+        var usfExpose = false
+        var usfSafWrite = false
+
+        fun notifyRootsChanged(context: Context) {
+            context.contentResolver.notifyChange(DocumentsContract.buildRootsUri(AUTHORITY), null)
+        }
+    }
+
+    private lateinit var volumeManager: VolumeManager
+    private val volumes = HashMap<String, Pair<Int, VolumeData>>()
+    private lateinit var encryptedFileProvider: EncryptedFileProvider
+
+    override fun onCreate(): Boolean {
+        val context = (context ?: return false)
+        val sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context)
+        usfExpose = sharedPreferences.getBoolean("usf_expose", false)
+        usfSafWrite = sharedPreferences.getBoolean("usf_saf_write", false)
+        volumeManager = (context.applicationContext as VolumeManagerApp).volumeManager
+        encryptedFileProvider = EncryptedFileProvider(context)
+        return true
+    }
+
+    override fun queryRoots(projection: Array<out String>?): Cursor {
+        val cursor = MatrixCursor(projection ?: DEFAULT_ROOT_PROJECTION)
+        if (!usfExpose) return cursor
+        volumes.clear()
+        for (volume in volumeManager.listVolumes()) {
+            var flags = DocumentsContract.Root.FLAG_LOCAL_ONLY or DocumentsContract.Root.FLAG_SUPPORTS_IS_CHILD
+            if (usfSafWrite && volume.second.canWrite(context!!.filesDir.path)) {
+                flags = flags or DocumentsContract.Root.FLAG_SUPPORTS_CREATE
+            }
+            cursor.newRow().apply {
+                add(DocumentsContract.Root.COLUMN_ROOT_ID, volume.second.name)
+                add(DocumentsContract.Root.COLUMN_FLAGS, flags)
+                add(DocumentsContract.Root.COLUMN_ICON, R.drawable.icon_document_provider)
+                add(DocumentsContract.Root.COLUMN_TITLE, volume.second.name)
+                add(DocumentsContract.Root.COLUMN_DOCUMENT_ID, volume.second.uuid)
+            }
+            volumes[volume.second.uuid] = volume
+        }
+        return cursor
+    }
+
+    internal data class DocumentData(
+        val rootId: String,
+        val volumeId: Int,
+        val volumeData: VolumeData,
+        val encryptedVolume: EncryptedVolume,
+        val path: String
+    ) {
+        fun child(childPath: String) = DocumentData(rootId, volumeId, volumeData, encryptedVolume, childPath)
+    }
+
+    private fun parseDocumentId(documentId: String): DocumentData? {
+        val splits = documentId.split("/", limit = 2)
+        if (splits.size > 2) {
+            return null
+        } else {
+            volumes[splits[0]]?.let {
+                val encryptedVolume = volumeManager.getVolume(it.first) ?: return null
+                val path = "/"+if (splits.size == 2) {
+                    splits[1]
+                } else {
+                    ""
+                }
+                return DocumentData(splits[0], it.first, it.second, encryptedVolume, path)
+            }
+        }
+        return null
+    }
+
+    override fun isChildDocument(parentDocumentId: String, documentId: String): Boolean {
+        if (!usfExpose) return false
+        val parent = parseDocumentId(parentDocumentId) ?: return false
+        val child = parseDocumentId(documentId) ?: return false
+        return parent.rootId == child.rootId && PathUtils.isChildOf(child.path, parent.path)
+    }
+
+    private fun addDocumentRow(cursor: MatrixCursor, volumeData: VolumeData, documentId: String, name: String, stat: Stat) {
+        val isDirectory = stat.type == Stat.S_IFDIR
+        var flags = 0
+        if (usfSafWrite && volumeData.canWrite(context!!.filesDir.path)) {
+            flags = flags or DocumentsContract.Document.FLAG_SUPPORTS_DELETE or DocumentsContract.Document.FLAG_SUPPORTS_RENAME
+            if (isDirectory) {
+                flags = flags or DocumentsContract.Document.FLAG_DIR_SUPPORTS_CREATE
+            } else if (stat.type == Stat.S_IFREG) {
+                flags = flags or DocumentsContract.Document.FLAG_SUPPORTS_WRITE
+            }
+        }
+        val mimeType = if (isDirectory) {
+            DocumentsContract.Document.MIME_TYPE_DIR
+        } else {
+            MimeTypeMap.getSingleton().getMimeTypeFromExtension(File(name).extension)
+                ?: "application/octet-stream"
+        }
+        cursor.newRow().apply {
+            add(DocumentsContract.Document.COLUMN_DOCUMENT_ID, documentId)
+            add(DocumentsContract.Document.COLUMN_DISPLAY_NAME, name)
+            add(DocumentsContract.Document.COLUMN_MIME_TYPE, mimeType)
+            add(DocumentsContract.Document.COLUMN_FLAGS, flags)
+            add(DocumentsContract.Document.COLUMN_SIZE, stat.size)
+            add(DocumentsContract.Document.COLUMN_LAST_MODIFIED, stat.mTime)
+        }
+    }
+
+    override fun queryDocument(documentId: String, projection: Array<out String>?): Cursor {
+        val cursor = MatrixCursor(projection ?: DEFAULT_DOCUMENT_PROJECTION)
+        if (!usfExpose) return cursor
+        val document = parseDocumentId(documentId) ?: return cursor
+        document.encryptedVolume.getAttr(document.path)?.let { stat ->
+            val name = if (document.path == "/") {
+                document.volumeData.shortName
+            } else {
+                File(document.path).name
+            }
+            addDocumentRow(cursor, document.volumeData, documentId, name, stat)
+        }
+        return cursor
+    }
+
+    override fun queryChildDocuments(
+        parentDocumentId: String,
+        projection: Array<out String>?,
+        sortOrder: String?
+    ): Cursor {
+        val cursor = MatrixCursor(projection ?: DEFAULT_DOCUMENT_PROJECTION)
+        if (!usfExpose) return cursor
+        val document = parseDocumentId(parentDocumentId) ?: return cursor
+        document.encryptedVolume.readDir(document.path)?.let { content ->
+            for (i in content) {
+                if (i.isParentFolder) continue
+                addDocumentRow(cursor, document.volumeData, document.rootId+i.fullPath, i.name, i.stat)
+            }
+        }
+        return cursor
+    }
+
+    class LazyExportedFile(
+        private val encryptedFileProvider: EncryptedFileProvider,
+        private val encryptedVolume: EncryptedVolume,
+        path: String,
+    ) : EncryptedFileProvider.ExportedFile(path) {
+
+        private val exportedFile: EncryptedFileProvider.ExportedFile by lazy {
+            val size = encryptedVolume.getAttr(path)?.size ?: run {
+                Log.e(TAG, "stat() failed")
+                throw RuntimeException("stat() failed")
+            }
+            val exportedFile = encryptedFileProvider.createFile(path, size) ?: run {
+                Log.e(TAG, "Can't create exported file")
+                throw RuntimeException("Can't create exported file")
+            }
+            if (!encryptedFileProvider.exportFile(exportedFile, encryptedVolume)) {
+                Log.e(TAG, "File export failed")
+                throw RuntimeException("File export failed")
+            }
+            exportedFile
+        }
+
+        override fun open(mode: Int, furtive: Boolean) = exportedFile.open(mode, furtive)
+        override fun free() = exportedFile.free()
+    }
+
+    override fun openDocument(
+        documentId: String,
+        mode: String,
+        signal: CancellationSignal?
+    ): ParcelFileDescriptor? {
+        if (!usfExpose) return null
+        val document = parseDocumentId(documentId) ?: return null
+
+        val lazyExportedFile = LazyExportedFile(encryptedFileProvider, document.encryptedVolume, document.path)
+
+        val result = encryptedFileProvider.openFile(
+            lazyExportedFile,
+            mode,
+            document.encryptedVolume,
+            volumeManager.getCoroutineScope(document.volumeId),
+            true,
+            usfSafWrite,
+        )
+        when (result.second) {
+            EncryptedFileProvider.Error.SUCCESS -> return result.first!!
+            EncryptedFileProvider.Error.WRITE_ACCESS_DENIED -> Log.e(TAG, "Unauthorized write access requested from $callingPackage")
+            else -> result.second.log()
+        }
+        return null
+    }
+
+    override fun createDocument(
+        parentDocumentId: String,
+        mimeType: String?,
+        displayName: String
+    ): String? {
+        if (!usfExpose || !usfSafWrite) return null
+        val document = parseDocumentId(parentDocumentId) ?: return null
+        val path = PathUtils.pathJoin(document.path, displayName)
+        var success = false
+        if (mimeType == DocumentsContract.Document.MIME_TYPE_DIR) {
+            success = document.encryptedVolume.mkdir(path)
+        } else {
+            val f = document.encryptedVolume.openFileWriteMode(path)
+            if (f != -1L) {
+                document.encryptedVolume.closeFile(f)
+                success = true
+            }
+        }
+        return if (success) {
+            document.rootId+path
+        } else {
+            null
+        }
+    }
+
+    override fun deleteDocument(documentId: String) {
+        if (!usfExpose || !usfSafWrite) return
+
+        fun recursiveRemoveDirectory(document: DocumentData) {
+            document.encryptedVolume.readDir(document.path)?.forEach { e ->
+                val childPath = PathUtils.pathJoin(document.path, e.name)
+                if (e.isDirectory) {
+                    recursiveRemoveDirectory(document.child(childPath))
+                } else  {
+                    document.encryptedVolume.deleteFile(childPath)
+                }
+                revokeDocumentPermission(document.rootId+childPath)
+            }
+            document.encryptedVolume.rmdir(document.path)
+        }
+
+        val document = parseDocumentId(documentId) ?: return
+        document.encryptedVolume.getAttr(document.path)?.let { stat ->
+            if (stat.type == Stat.S_IFDIR) {
+                recursiveRemoveDirectory(document)
+            } else {
+                document.encryptedVolume.deleteFile(document.path)
+            }
+        }
+    }
+
+    override fun renameDocument(documentId: String, displayName: String): String {
+        if (!usfExpose || !usfSafWrite) return documentId
+        val document = parseDocumentId(documentId) ?: return documentId
+        val newPath = PathUtils.pathJoin(PathUtils.getParentPath(document.path), displayName)
+        return if (document.encryptedVolume.rename(document.path, newPath)) {
+            document.rootId+newPath
+        } else {
+            documentId
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/explorers/BaseExplorerActivity.kt

@@ -11,9 +11,12 @@ import android.view.Menu
 import android.view.MenuItem
 import android.view.View
 import android.widget.ImageButton
+import android.widget.ProgressBar
 import android.widget.TextView
 import android.widget.Toast
+import androidx.activity.addCallback
 import androidx.core.content.ContextCompat
+import androidx.core.view.isVisible
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
 import androidx.lifecycle.lifecycleScope
@@ -22,25 +25,36 @@ import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.MainScope
+import kotlinx.coroutines.async
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.cancelAndJoin
 import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
+import kotlinx.coroutines.yield
 import sushi.hardcore.droidfs.BaseActivity
-import sushi.hardcore.droidfs.ConstValues
+import sushi.hardcore.droidfs.Constants
-import sushi.hardcore.droidfs.ConstValues.isAudio
+import sushi.hardcore.droidfs.EncryptedFileProvider
-import sushi.hardcore.droidfs.ConstValues.isImage
+import sushi.hardcore.droidfs.FileShare
-import sushi.hardcore.droidfs.ConstValues.isPDF
+import sushi.hardcore.droidfs.FileTypes
-import sushi.hardcore.droidfs.ConstValues.isText
+import sushi.hardcore.droidfs.LoadingTask
-import sushi.hardcore.droidfs.ConstValues.isVideo
-import sushi.hardcore.droidfs.GocryptfsVolume
 import sushi.hardcore.droidfs.R
+import sushi.hardcore.droidfs.VolumeManagerApp
 import sushi.hardcore.droidfs.adapters.ExplorerElementAdapter
 import sushi.hardcore.droidfs.adapters.OpenAsDialogAdapter
-import sushi.hardcore.droidfs.content_providers.ExternalProvider
+import sushi.hardcore.droidfs.content_providers.TemporaryFileProvider
-import sushi.hardcore.droidfs.content_providers.RestrictedFileProvider
 import sushi.hardcore.droidfs.file_operations.FileOperationService
 import sushi.hardcore.droidfs.file_operations.OperationFile
-import sushi.hardcore.droidfs.file_viewers.*
+import sushi.hardcore.droidfs.file_operations.TaskResult
+import sushi.hardcore.droidfs.file_viewers.AudioPlayer
+import sushi.hardcore.droidfs.file_viewers.ImageViewer
+import sushi.hardcore.droidfs.file_viewers.PdfViewer
+import sushi.hardcore.droidfs.file_viewers.TextEditor
+import sushi.hardcore.droidfs.file_viewers.VideoPlayer
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.filesystems.Stat
 import sushi.hardcore.droidfs.util.PathUtils
+import sushi.hardcore.droidfs.util.UIUtils
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import sushi.hardcore.droidfs.widgets.EditTextDialog
 
@@ -50,7 +64,8 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
     private var foldersFirst = true
     private var mapFolders = true
     private var currentSortOrderIndex = 0
-    protected lateinit var gocryptfsVolume: GocryptfsVolume
+    protected var volumeId = -1
+    protected lateinit var encryptedVolume: EncryptedVolume
     private lateinit var volumeName: String
     private lateinit var explorerViewModel: ExplorerViewModel
     protected var currentDirectoryPath: String = ""
@@ -59,39 +74,42 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
             explorerViewModel.currentDirectoryPath = value
         }
     protected lateinit var fileOperationService: FileOperationService
+    protected val activityScope = MainScope()
+    private var directoryLoadingTask: Job? = null
     protected lateinit var explorerElements: MutableList<ExplorerElement>
     protected lateinit var explorerAdapter: ExplorerElementAdapter
-    private var isCreating = true
+    protected lateinit var app: VolumeManagerApp
-    protected var isStartingActivity = false
     private var usf_open = false
-    protected var usf_keep_open = false
     private lateinit var linearLayoutManager: LinearLayoutManager
     private var isUsingListLayout = true
     private lateinit var layoutIcon: ImageButton
     private lateinit var titleText: TextView
     private lateinit var recycler_view_explorer: RecyclerView
     private lateinit var refresher: SwipeRefreshLayout
+    private lateinit var loader: ProgressBar
     private lateinit var textDirEmpty: TextView
     private lateinit var currentPathText: TextView
     private lateinit var numberOfFilesText: TextView
     private lateinit var numberOfFoldersText: TextView
     private lateinit var totalSizeText: TextView
+    protected val fileShare by lazy { FileShare(this) }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        app = application as VolumeManagerApp
         usf_open = sharedPrefs.getBoolean("usf_open", false)
-        usf_keep_open = sharedPrefs.getBoolean("usf_keep_open", false)
+        volumeName = intent.getStringExtra("volumeName") ?: ""
-        volumeName = intent.getStringExtra("volume_name") ?: ""
+        volumeId = intent.getIntExtra("volumeId", -1)
-        val sessionID = intent.getIntExtra("sessionID", -1)
+        encryptedVolume = app.volumeManager.getVolume(volumeId)!!
-        gocryptfsVolume = GocryptfsVolume(applicationContext, sessionID)
         sortOrderEntries = resources.getStringArray(R.array.sort_orders_entries)
         sortOrderValues = resources.getStringArray(R.array.sort_orders_values)
         foldersFirst = sharedPrefs.getBoolean("folders_first", true)
         mapFolders = sharedPrefs.getBoolean("map_folders", true)
-        currentSortOrderIndex = resources.getStringArray(R.array.sort_orders_values).indexOf(sharedPrefs.getString(ConstValues.SORT_ORDER_KEY, "name"))
+        currentSortOrderIndex = resources.getStringArray(R.array.sort_orders_values).indexOf(sharedPrefs.getString(Constants.SORT_ORDER_KEY, "name"))
         init()
         recycler_view_explorer = findViewById(R.id.recycler_view_explorer)
         refresher = findViewById(R.id.refresher)
+        loader = findViewById(R.id.loader)
         textDirEmpty = findViewById(R.id.text_dir_empty)
         currentPathText = findViewById(R.id.current_path_text)
         numberOfFilesText = findViewById(R.id.number_of_files_text)
@@ -107,21 +125,33 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
         explorerAdapter = ExplorerElementAdapter(
             this,
             if (sharedPrefs.getBoolean("thumbnails", true)) {
-                gocryptfsVolume
+                encryptedVolume
             } else {
                 null
             },
             this,
-            sharedPrefs.getLong(ConstValues.THUMBNAIL_MAX_SIZE_KEY, ConstValues.DEFAULT_THUMBNAIL_MAX_SIZE)*1000,
+            sharedPrefs.getLong(Constants.THUMBNAIL_MAX_SIZE_KEY, Constants.DEFAULT_THUMBNAIL_MAX_SIZE)*1000,
         )
         explorerViewModel = ViewModelProvider(this).get(ExplorerViewModel::class.java)
         currentDirectoryPath = explorerViewModel.currentDirectoryPath
-        setCurrentPath(currentDirectoryPath)
         linearLayoutManager = LinearLayoutManager(this@BaseExplorerActivity)
         recycler_view_explorer.adapter = explorerAdapter
         isUsingListLayout = sharedPrefs.getBoolean("useListLayout", true)
         layoutIcon = findViewById(R.id.layout_icon)
         setRecyclerViewLayout()
+        onBackPressedDispatcher.addCallback(this) {
+            if (explorerAdapter.selectedItems.isEmpty()) {
+                val parentPath = PathUtils.getParentPath(currentDirectoryPath)
+                if (parentPath == currentDirectoryPath) {
+                    isEnabled = false
+                    onBackPressedDispatcher.onBackPressed()
+                } else {
+                    setCurrentPath(PathUtils.getParentPath(currentDirectoryPath))
+                }
+            } else {
+                unselectAll()
+            }
+        }
         layoutIcon.setOnClickListener {
             isUsingListLayout = !isUsingListLayout
             setRecyclerViewLayout()
@@ -139,7 +169,7 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
     }
 
     class ExplorerViewModel: ViewModel() {
-        var currentDirectoryPath = ""
+        var currentDirectoryPath = "/"
     }
 
     private fun setRecyclerViewLayout() {
@@ -157,7 +187,7 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
     }
 
     protected open fun init() {
-        setContentView(R.layout.activity_explorer_base)
+        setContentView(R.layout.activity_explorer)
     }
 
     protected open fun bindFileOperationService(){
@@ -166,33 +196,60 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
                 override fun onServiceConnected(className: ComponentName, service: IBinder) {
                     val binder = service as FileOperationService.LocalBinder
                     fileOperationService = binder.getService()
-                    binder.setGocryptfsVolume(gocryptfsVolume)
-                }
-                override fun onServiceDisconnected(arg0: ComponentName) {
-
                 }
+                override fun onServiceDisconnected(arg0: ComponentName) {}
             }, Context.BIND_AUTO_CREATE)
         }
     }
 
-    private fun startFileViewer(cls: Class<*>, filePath: String){
+    private fun startFileViewer(cls: Class<*>, filePath: String) {
         val intent = Intent(this, cls).apply {
             putExtra("path", filePath)
-            putExtra("sessionID", gocryptfsVolume.sessionID)
+            putExtra("volume", encryptedVolume)
             putExtra("sortOrder", sortOrderValues[currentSortOrderIndex])
         }
-        isStartingActivity = true
         startActivity(intent)
     }
 
-    private fun openWithExternalApp(fullPath: String){
+    protected fun onExportFailed(errorResId: Int) {
-        isStartingActivity = true
+        CustomAlertDialogBuilder(this, theme)
-        ExternalProvider.open(this, themeValue, gocryptfsVolume, fullPath)
+            .setTitle(R.string.error)
+            .setMessage(getString(R.string.tmp_export_failed, getString(errorResId)))
+            .setPositiveButton(R.string.ok, null)
+            .show()
     }
 
-    private fun showOpenAsDialog(path: String) {
+    private fun openWithExternalApp(path: String, size: Long) {
+        app.isExporting = true
+        val exportedFile = TemporaryFileProvider.instance.encryptedFileProvider.createFile(path, size)
+        if (exportedFile == null) {
+            onExportFailed(R.string.export_failed_create)
+            return
+        }
+        val msg = when (exportedFile) {
+            is EncryptedFileProvider.ExportedMemFile -> R.string.export_mem
+            is EncryptedFileProvider.ExportedDiskFile -> R.string.export_disk
+            else -> R.string.loading_msg_export
+        }
+        object : LoadingTask<Pair<Intent?, Int?>>(this, theme, msg) {
+            override suspend fun doTask(): Pair<Intent?, Int?> {
+                return fileShare.openWith(exportedFile, size, volumeId)
+            }
+        }.startTask(lifecycleScope) { (intent, error) ->
+            if (intent == null) {
+                onExportFailed(error!!)
+            } else {
+                app.isStartingExternalApp = true
+                startActivity(intent)
+            }
+            app.isExporting = false
+        }
+    }
+
+    private fun showOpenAsDialog(explorerElement: ExplorerElement) {
+        val path = explorerElement.fullPath
         val adapter = OpenAsDialogAdapter(this, usf_open)
-        CustomAlertDialogBuilder(this, themeValue)
+        CustomAlertDialogBuilder(this, theme)
             .setSingleChoiceItems(adapter, -1) { dialog, which ->
                 when (adapter.getItem(which)) {
                     "image" -> startFileViewer(ImageViewer::class.java, path)
@@ -201,7 +258,7 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
                     "pdf" -> startFileViewer(PdfViewer::class.java, path)
                     "text" -> startFileViewer(TextEditor::class.java, path)
                     "external" -> if (usf_open) {
-                        openWithExternalApp(path)
+                        openWithExternalApp(path, explorerElement.stat.size)
                     }
                 }
                 dialog.dismiss()
@@ -233,22 +290,22 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
                 explorerElements[position].isParentFolder -> {
                     setCurrentPath(PathUtils.getParentPath(currentDirectoryPath))
                 }
-                isImage(fullPath) -> {
+                FileTypes.isImage(fullPath) -> {
                     startFileViewer(ImageViewer::class.java, fullPath)
                 }
-                isVideo(fullPath) -> {
+                FileTypes.isVideo(fullPath) -> {
                     startFileViewer(VideoPlayer::class.java, fullPath)
                 }
-                isText(fullPath) -> {
+                FileTypes.isText(fullPath) -> {
                     startFileViewer(TextEditor::class.java, fullPath)
                 }
-                isPDF(fullPath) -> {
+                FileTypes.isPDF(fullPath) -> {
                     startFileViewer(PdfViewer::class.java, fullPath)
                 }
-                isAudio(fullPath) -> {
+                FileTypes.isAudio(fullPath) -> {
                     startFileViewer(AudioPlayer::class.java, fullPath)
                 }
-                else -> showOpenAsDialog(fullPath)
+                else -> showOpenAsDialog(explorerElements[position])
             }
         }
         invalidateOptionsMenu()
@@ -263,24 +320,21 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
         invalidateOptionsMenu()
     }
 
-    private fun displayExplorerElements(totalSize: Long) {
+    private fun displayExplorerElements() {
-        totalSizeText.text = getString(R.string.total_size, PathUtils.formatSize(totalSize))
+        ExplorerElement.sortBy(sortOrderValues[currentSortOrderIndex], foldersFirst, explorerElements)
-        synchronized(this) {
-            ExplorerElement.sortBy(sortOrderValues[currentSortOrderIndex], foldersFirst, explorerElements)
-        }
         unselectAll(false)
+        loader.isVisible = false
+        recycler_view_explorer.isVisible = true
         explorerAdapter.explorerElements = explorerElements
-        val sharedPrefsEditor = sharedPrefs.edit()
-        sharedPrefsEditor.putString(ConstValues.SORT_ORDER_KEY, sortOrderValues[currentSortOrderIndex])
-        sharedPrefsEditor.apply()
     }
 
-    private fun recursiveSetSize(directory: ExplorerElement) {
+    private suspend fun recursiveSetSize(directory: ExplorerElement) {
-        for (child in gocryptfsVolume.listDir(directory.fullPath)) {
+        yield()
+        for (child in encryptedVolume.readDir(directory.fullPath) ?: return) {
             if (child.isDirectory) {
                 recursiveSetSize(child)
             }
-            directory.size += child.size
+            directory.stat.size += child.stat.size
         }
     }
 
@@ -299,15 +353,16 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
         }
     }
 
-    protected fun setCurrentPath(path: String, onDisplayed: (() -> Unit)? = null) {
+    protected fun setCurrentPath(path: String, onDisplayed: (() -> Unit)? = null) = lifecycleScope.launch {
-        synchronized(this) {
+        directoryLoadingTask?.cancelAndJoin()
-            explorerElements = gocryptfsVolume.listDir(path)
+        recycler_view_explorer.isVisible = false
-            if (path.isNotEmpty()) { //not root
+        loader.isVisible = true
-                explorerElements.add(
+        explorerElements = encryptedVolume.readDir(path) ?: return@launch
-                    0,
+        if (path != "/") {
-                    ExplorerElement("..", (-1).toShort(), parentPath = currentDirectoryPath)
+            explorerElements.add(
-                )
+                0,
-            }
+                ExplorerElement("..", Stat.parentFolderStat(), parentPath = currentDirectoryPath)
+            )
         }
         textDirEmpty.visibility = if (explorerElements.size == 0) View.VISIBLE else View.GONE
         currentDirectoryPath = path
@@ -315,55 +370,47 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
         displayNumberOfElements(numberOfFilesText, R.string.one_file, R.string.multiple_files, explorerElements.count { it.isRegularFile })
         displayNumberOfElements(numberOfFoldersText, R.string.one_folder, R.string.multiple_folders, explorerElements.count { it.isDirectory })
         if (mapFolders) {
-            lifecycleScope.launch {
+            var totalSize: Long = 0
-                var totalSize: Long = 0
+            directoryLoadingTask = launch(Dispatchers.IO) {
-                withContext(Dispatchers.IO) {
+                for (element in explorerElements) {
-                    synchronized(this@BaseExplorerActivity) {
+                    if (element.isDirectory) {
-                        for (element in explorerElements) {
+                        recursiveSetSize(element)
-                            if (element.isDirectory) {
-                                recursiveSetSize(element)
-                            }
-                            totalSize += element.size
-                        }
                     }
+                    totalSize += element.stat.size
                 }
-                displayExplorerElements(totalSize)
-                onDisplayed?.invoke()
             }
+            directoryLoadingTask!!.join()
+            displayExplorerElements()
+            totalSizeText.text = getString(R.string.total_size, PathUtils.formatSize(totalSize))
+            onDisplayed?.invoke()
         } else {
-            displayExplorerElements(explorerElements.filter { !it.isParentFolder }.sumOf { it.size })
+            displayExplorerElements()
+            totalSizeText.text = getString(
+                R.string.total_size,
+                PathUtils.formatSize(explorerElements.filter { !it.isParentFolder }.sumOf { it.stat.size })
+            )
             onDisplayed?.invoke()
         }
     }
 
-    private fun askCloseVolume() {
+    private fun askLockVolume() {
-        CustomAlertDialogBuilder(this, themeValue)
+        CustomAlertDialogBuilder(this, theme)
                 .setTitle(R.string.warning)
-                .setMessage(R.string.ask_close_volume)
+                .setMessage(R.string.ask_lock_volume)
-                .setPositiveButton(R.string.ok) { _, _ -> closeVolumeOnUserExit() }
+                .setPositiveButton(R.string.ok) { _, _ ->
+                    app.volumeManager.closeVolume(volumeId)
+                    finish()
+                }
                 .setNegativeButton(R.string.cancel, null)
                 .show()
     }
 
-    override fun onBackPressed() {
-        if (explorerAdapter.selectedItems.isEmpty()) {
-            val parentPath = PathUtils.getParentPath(currentDirectoryPath)
-            if (parentPath == currentDirectoryPath) {
-                askCloseVolume()
-            } else {
-                setCurrentPath(PathUtils.getParentPath(currentDirectoryPath))
-            }
-        } else {
-            unselectAll()
-        }
-    }
-
     private fun createFolder(folderName: String){
         if (folderName.isEmpty()) {
             Toast.makeText(this, R.string.error_filename_empty, Toast.LENGTH_SHORT).show()
         } else {
-            if (!gocryptfsVolume.mkdir(PathUtils.pathJoin(currentDirectoryPath, folderName))) {
+            if (!encryptedVolume.mkdir(PathUtils.pathJoin(currentDirectoryPath, folderName))) {
-                CustomAlertDialogBuilder(this, themeValue)
+                CustomAlertDialogBuilder(this, theme)
                         .setTitle(R.string.error)
                         .setMessage(R.string.error_mkdir)
                         .setPositiveButton(R.string.ok, null)
@@ -381,28 +428,34 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
         }.show()
     }
 
-    protected fun checkPathOverwrite(items: ArrayList<OperationFile>, dstDirectoryPath: String, callback: (ArrayList<OperationFile>?) -> Unit) {
+    protected fun checkPathOverwrite(items: List<OperationFile>, dstDirectoryPath: String, callback: (List<OperationFile>?) -> Unit) {
-        val srcDirectoryPath = items[0].explorerElement.parentPath
+        val srcDirectoryPath = items[0].parentPath
         var ready = true
-        for (i in 0 until items.size) {
+        for (i in items.indices) {
             val testDstPath: String
             if (items[i].dstPath == null){
-                testDstPath = PathUtils.pathJoin(dstDirectoryPath, PathUtils.getRelativePath(srcDirectoryPath, items[i].explorerElement.fullPath))
+                testDstPath = PathUtils.pathJoin(dstDirectoryPath, PathUtils.getRelativePath(srcDirectoryPath, items[i].srcPath))
-                if (gocryptfsVolume.pathExists(testDstPath)){
+                if (encryptedVolume.pathExists(testDstPath)) {
                     ready = false
                 } else {
                     items[i].dstPath = testDstPath
                 }
             } else {
                 testDstPath = items[i].dstPath!!
-                if (gocryptfsVolume.pathExists(testDstPath) && !items[i].overwriteConfirmed){
+                if (encryptedVolume.pathExists(testDstPath) && !items[i].overwriteConfirmed) {
                     ready = false
                 }
             }
             if (!ready){
-                CustomAlertDialogBuilder(this, themeValue)
+                CustomAlertDialogBuilder(this, theme)
                     .setTitle(R.string.warning)
-                    .setMessage(getString(if (items[i].explorerElement.isDirectory){R.string.dir_overwrite_question} else {R.string.file_overwrite_question}, testDstPath))
+                    .setMessage(getString(
+                        if (items[i].isDirectory) {
+                            R.string.dir_overwrite_question
+                        } else {
+                            R.string.file_overwrite_question
+                        }, testDstPath
+                    ))
                     .setPositiveButton(R.string.yes) {_, _ ->
                         items[i].dstPath = testDstPath
                         items[i].overwriteConfirmed = true
@@ -410,17 +463,17 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
                     }
                     .setNegativeButton(R.string.no) { _, _ ->
                         with(EditTextDialog(this, R.string.enter_new_name) {
-                            items[i].dstPath = PathUtils.pathJoin(dstDirectoryPath, PathUtils.getRelativePath(srcDirectoryPath, items[i].explorerElement.parentPath), it)
+                            items[i].dstPath = PathUtils.pathJoin(dstDirectoryPath, PathUtils.getRelativePath(srcDirectoryPath, items[i].parentPath), it)
-                            if (items[i].explorerElement.isDirectory){
+                            if (items[i].isDirectory) {
-                                for (j in 0 until items.size){
+                                for (j in items.indices) {
-                                    if (PathUtils.isChildOf(items[j].explorerElement.fullPath, items[i].explorerElement.fullPath)){
+                                    if (PathUtils.isChildOf(items[j].srcPath, items[i].srcPath)) {
-                                        items[j].dstPath = PathUtils.pathJoin(items[i].dstPath!!, PathUtils.getRelativePath(items[i].explorerElement.fullPath, items[j].explorerElement.fullPath))
+                                        items[j].dstPath = PathUtils.pathJoin(items[i].dstPath!!, PathUtils.getRelativePath(items[i].srcPath, items[j].srcPath))
                                     }
                                 }
                             }
                             checkPathOverwrite(items, dstDirectoryPath, callback)
                         }) {
-                            setSelectedText(items[i].explorerElement.name)
+                            setSelectedText(items[i].name)
                             setOnCancelListener{
                                 callback(null)
                             }
@@ -439,12 +492,38 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
         }
     }
 
-    protected fun importFilesFromUris(uris: List<Uri>, callback: (String?) -> Unit) {
+    protected fun onTaskResult(
+        result: TaskResult<out String?>,
+        failedErrorMessage: Int,
+        successMessage: Int = -1,
+        onSuccess: (() -> Unit)? = null,
+    ) {
+        when (result.state) {
+            TaskResult.State.SUCCESS -> {
+                if (onSuccess == null) {
+                    Toast.makeText(this, successMessage, Toast.LENGTH_SHORT).show()
+                } else {
+                    onSuccess()
+                }
+            }
+            TaskResult.State.FAILED -> {
+                CustomAlertDialogBuilder(this, theme)
+                    .setTitle(R.string.error)
+                    .setMessage(getString(failedErrorMessage, result.failedItem))
+                    .setPositiveButton(R.string.ok, null)
+                    .show()
+            }
+            TaskResult.State.ERROR -> result.showErrorAlertDialog(this, theme)
+            TaskResult.State.CANCELLED -> {}
+        }
+    }
+
+    protected fun importFilesFromUris(uris: List<Uri>, callback: () -> Unit) {
         val items = ArrayList<OperationFile>()
         for (uri in uris) {
             val fileName = PathUtils.getFilenameFromURI(this, uri)
             if (fileName == null) {
-                CustomAlertDialogBuilder(this, themeValue)
+                CustomAlertDialogBuilder(this, theme)
                         .setTitle(R.string.error)
                         .setMessage(getString(R.string.error_retrieving_filename, uri))
                         .setPositiveButton(R.string.ok, null)
@@ -452,19 +531,16 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
                 items.clear()
                 break
             } else {
-                items.add(OperationFile.fromExplorerElement(ExplorerElement(fileName, 1, parentPath = currentDirectoryPath)))
+                items.add(OperationFile(PathUtils.pathJoin(currentDirectoryPath, fileName), Stat.S_IFREG))
             }
         }
         if (items.size > 0) {
             checkPathOverwrite(items, currentDirectoryPath) { checkedItems ->
                 checkedItems?.let {
-                    lifecycleScope.launch {
+                    activityScope.launch {
-                        val taskResult = fileOperationService.importFilesFromUris(checkedItems.map { it.dstPath!! }, uris)
+                        val result = fileOperationService.importFilesFromUris(volumeId, checkedItems.map { it.dstPath!! }, uris)
-                        if (taskResult.cancelled) {
+                        onTaskResult(result, R.string.import_failed, onSuccess = callback)
-                            setCurrentPath(currentDirectoryPath)
+                        setCurrentPath(currentDirectoryPath)
-                        } else {
-                            callback(taskResult.failedItem)
-                        }
                     }
                 }
             }
@@ -475,8 +551,8 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
         if (new_name.isEmpty()) {
             Toast.makeText(this, R.string.error_filename_empty, Toast.LENGTH_SHORT).show()
         } else {
-            if (!gocryptfsVolume.rename(PathUtils.pathJoin(currentDirectoryPath, old_name), PathUtils.pathJoin(currentDirectoryPath, new_name))) {
+            if (!encryptedVolume.rename(PathUtils.pathJoin(currentDirectoryPath, old_name), PathUtils.pathJoin(currentDirectoryPath, new_name))) {
-                CustomAlertDialogBuilder(this, themeValue)
+                CustomAlertDialogBuilder(this, theme)
                         .setTitle(R.string.error)
                         .setMessage(getString(R.string.rename_failed, old_name))
                         .setPositiveButton(R.string.ok, null)
@@ -489,26 +565,19 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
         }
     }
 
-    private fun setMenuIconTint(menu: Menu, iconColor: Int, menuItemId: Int, drawableId: Int) {
+    override fun onCreateOptionsMenu(menu: Menu): Boolean {
-        menu.findItem(menuItemId)?.let {
-            it.icon = ContextCompat.getDrawable(this, drawableId)?.apply {
-                setTint(iconColor)
-            }
-        }
-    }
-
-    protected fun handleMenuItems(menu: Menu){
         menu.findItem(R.id.rename).isVisible = false
         menu.findItem(R.id.open_as)?.isVisible = false
         if (usf_open){
             menu.findItem(R.id.external_open)?.isVisible = false
         }
         val noItemSelected = explorerAdapter.selectedItems.isEmpty()
-        val iconColor = ContextCompat.getColor(this, R.color.neutralIconTint)
+        with(UIUtils.getMenuIconNeutralTint(this, menu)) {
-        setMenuIconTint(menu, iconColor, R.id.sort, R.drawable.icon_sort)
+            applyTo(R.id.sort, R.drawable.icon_sort)
-        setMenuIconTint(menu, iconColor, R.id.decrypt, R.drawable.icon_decrypt)
+            applyTo(R.id.share, R.drawable.icon_share)
-        setMenuIconTint(menu, iconColor, R.id.share, R.drawable.icon_share)
+        }
         menu.findItem(R.id.sort).isVisible = noItemSelected
+        menu.findItem(R.id.lock).isVisible = noItemSelected
         menu.findItem(R.id.close).isVisible = noItemSelected
         supportActionBar?.setDisplayHomeAsUpEnabled(!noItemSelected)
         if (!noItemSelected) {
@@ -522,6 +591,7 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
                 }
             }
         }
+        return super.onCreateOptionsMenu(menu)
     }
 
     override fun onOptionsItemSelected(item: MenuItem): Boolean {
@@ -531,11 +601,17 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
                 true
             }
             R.id.sort -> {
-                CustomAlertDialogBuilder(this, themeValue)
+                CustomAlertDialogBuilder(this, theme)
                         .setTitle(R.string.sort_order)
                         .setSingleChoiceItems(sortOrderEntries, currentSortOrderIndex) { dialog, which ->
                             currentSortOrderIndex = which
-                            setCurrentPath(currentDirectoryPath)
+                            // displayExplorerElements must not be called if directoryLoadingTask is active
+                            if (directoryLoadingTask?.isActive != true) {
+                                displayExplorerElements()
+                            }
+                            val sharedPrefsEditor = sharedPrefs.edit()
+                            sharedPrefsEditor.putString(Constants.SORT_ORDER_KEY, sortOrderValues[currentSortOrderIndex])
+                            sharedPrefsEditor.apply()
                             dialog.dismiss()
                         }
                         .setNegativeButton(R.string.cancel, null)
@@ -553,75 +629,45 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
                 true
             }
             R.id.open_as -> {
-                showOpenAsDialog(
+                showOpenAsDialog(explorerElements[explorerAdapter.selectedItems.first()])
-                    PathUtils.pathJoin(
-                        currentDirectoryPath,
-                        explorerElements[explorerAdapter.selectedItems.first()].name
-                    )
-                )
                 true
             }
             R.id.external_open -> {
                 if (usf_open){
-                    openWithExternalApp(
+                    val explorerElement = explorerElements[explorerAdapter.selectedItems.first()]
-                        PathUtils.pathJoin(
+                    openWithExternalApp(explorerElement.fullPath, explorerElement.stat.size)
-                            currentDirectoryPath,
-                            explorerElements[explorerAdapter.selectedItems.first()].name
-                        )
-                    )
                     unselectAll()
                 }
                 true
             }
             R.id.close -> {
-                askCloseVolume()
+                finish()
+                true
+            }
+            R.id.lock -> {
+                askLockVolume()
                 true
             }
             else -> super.onOptionsItemSelected(item)
         }
     }
 
-    protected open fun closeVolumeOnUserExit() {
-        finish()
-    }
-
-    protected open fun closeVolumeOnDestroy() {
-        if (!gocryptfsVolume.isClosed()){
-            gocryptfsVolume.close()
-        }
-        RestrictedFileProvider.wipeAll(this) //additional security
-    }
-
     override fun onDestroy() {
         super.onDestroy()
         if (!isChangingConfigurations) { //activity won't be recreated
-            closeVolumeOnDestroy()
+            activityScope.cancel()
-        }
-    }
-
-    override fun onPause() {
-        super.onPause()
-        if (!isChangingConfigurations){
-            if (isStartingActivity){
-                isStartingActivity = false
-            } else if (!usf_keep_open){
-                finish()
-            }
         }
     }
 
     override fun onResume() {
         super.onResume()
-        if (isCreating){
+        if (app.isStartingExternalApp) {
-            isCreating = false
+            TemporaryFileProvider.instance.wipe()
+        }
+        if (encryptedVolume.isClosed()) {
+            finish()
         } else {
-            if (gocryptfsVolume.isClosed()){
+            setCurrentPath(currentDirectoryPath)
-                finish()
-            } else {
-                isStartingActivity = false
-                ExternalProvider.removeFilesAsync(this)
-                setCurrentPath(currentDirectoryPath)
-            }
         }
     }
 }

app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerActivity.kt

@@ -6,22 +6,22 @@ import android.net.Uri
 import android.view.Menu
 import android.view.MenuItem
 import android.widget.Toast
+import androidx.activity.addCallback
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.documentfile.provider.DocumentFile
 import androidx.lifecycle.lifecycleScope
+import com.google.android.material.floatingactionbutton.FloatingActionButton
 import kotlinx.coroutines.launch
 import sushi.hardcore.droidfs.CameraActivity
-import sushi.hardcore.droidfs.GocryptfsVolume
+import sushi.hardcore.droidfs.LoadingTask
 import sushi.hardcore.droidfs.MainActivity
 import sushi.hardcore.droidfs.R
 import sushi.hardcore.droidfs.adapters.IconTextDialogAdapter
-import sushi.hardcore.droidfs.content_providers.ExternalProvider
-import sushi.hardcore.droidfs.databinding.ActivityExplorerBinding
 import sushi.hardcore.droidfs.file_operations.OperationFile
+import sushi.hardcore.droidfs.filesystems.Stat
 import sushi.hardcore.droidfs.util.PathUtils
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import sushi.hardcore.droidfs.widgets.EditTextDialog
-import java.io.File
 
 class ExplorerActivity : BaseExplorerActivity() {
     companion object {
@@ -32,176 +32,160 @@ class ExplorerActivity : BaseExplorerActivity() {
     private var usf_share = false
     private var currentItemAction = ItemsActions.NONE
     private val itemsToProcess = ArrayList<OperationFile>()
-    private lateinit var binding: ActivityExplorerBinding
     private val pickFromOtherVolumes = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
         if (result.resultCode == Activity.RESULT_OK) {
             result.data?.let { resultIntent ->
-                val remoteSessionID = resultIntent.getIntExtra("sessionID", -1)
+                val srcVolumeId = resultIntent.getIntExtra("volumeId", -1)
-                val remoteGocryptfsVolume = GocryptfsVolume(applicationContext, remoteSessionID)
+                val srcEncryptedVolume = app.volumeManager.getVolume(srcVolumeId)!!
                 val path = resultIntent.getStringExtra("path")
-                val operationFiles = ArrayList<OperationFile>()
                 if (path == null){ //multiples elements
                     val paths = resultIntent.getStringArrayListExtra("paths")
                     val types = resultIntent.getIntegerArrayListExtra("types")
                     if (types != null && paths != null){
-                        for (i in paths.indices) {
+                        object : LoadingTask<List<OperationFile>>(this, theme, R.string.discovering_files) {
-                            operationFiles.add(
+                            override suspend fun doTask(): List<OperationFile> {
-                                OperationFile.fromExplorerElement(
+                                val operationFiles = ArrayList<OperationFile>()
-                                    ExplorerElement(File(paths[i]).name, types[i].toShort(), parentPath = PathUtils.getParentPath(paths[i]))
+                                for (i in paths.indices) {
-                                )
+                                    operationFiles.add(OperationFile(paths[i], types[i]))
-                            )
+                                    if (types[i] == Stat.S_IFDIR) {
-                            if (types[i] == 0){ //directory
+                                        srcEncryptedVolume.recursiveMapFiles(paths[i])?.forEach {
-                                remoteGocryptfsVolume.recursiveMapFiles(paths[i]).forEach {
+                                            operationFiles.add(OperationFile.fromExplorerElement(it))
-                                    operationFiles.add(OperationFile.fromExplorerElement(it))
+                                        }
+                                    }
                                 }
+                                return operationFiles
                             }
+                        }.startTask(lifecycleScope) { operationFiles ->
+                            importFilesFromVolume(srcVolumeId, operationFiles)
                         }
                     }
                 } else {
-                    operationFiles.add(
+                    importFilesFromVolume(srcVolumeId, arrayListOf(OperationFile(path, Stat.S_IFREG)))
-                        OperationFile.fromExplorerElement(
-                            ExplorerElement(File(path).name, 1, parentPath = PathUtils.getParentPath(path))
-                        )
-                    )
-                }
-                if (operationFiles.size > 0){
-                    checkPathOverwrite(operationFiles, currentDirectoryPath) { items ->
-                        if (items == null) {
-                            remoteGocryptfsVolume.close()
-                        } else {
-                            lifecycleScope.launch {
-                                val failedItem = fileOperationService.copyElements(items, remoteGocryptfsVolume)
-                                if (failedItem == null) {
-                                    Toast.makeText(this@ExplorerActivity, R.string.success_import, Toast.LENGTH_SHORT).show()
-                                } else {
-                                    CustomAlertDialogBuilder(this@ExplorerActivity, themeValue)
-                                        .setTitle(R.string.error)
-                                        .setMessage(getString(R.string.import_failed, failedItem))
-                                        .setPositiveButton(R.string.ok, null)
-                                        .show()
-                                }
-                                setCurrentPath(currentDirectoryPath)
-                                remoteGocryptfsVolume.close()
-                            }
-                        }
-                    }
-                } else {
-                    remoteGocryptfsVolume.close()
                 }
             }
         }
     }
     private val pickFiles = registerForActivityResult(ActivityResultContracts.OpenMultipleDocuments()) { uris ->
         if (uris != null) {
-            importFilesFromUris(uris){ failedItem ->
+            for (uri in uris) {
-                onImportComplete(failedItem, uris)
+                contentResolver.takePersistableUriPermission(uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
+            }
+            importFilesFromUris(uris) {
+                onImportComplete(uris)
             }
         }
     }
     private val pickExportDirectory = registerForActivityResult(ActivityResultContracts.OpenDocumentTree()) { uri ->
         if (uri != null) {
-            lifecycleScope.launch {
+            contentResolver.takePersistableUriPermission(uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
-                val result = fileOperationService.exportFiles(uri, explorerAdapter.selectedItems.map { i -> explorerElements[i] })
+            val items = explorerAdapter.selectedItems.map { i -> explorerElements[i] }
-                if (!result.cancelled) {
+            activityScope.launch {
-                    if (result.failedItem == null) {
+                val result = fileOperationService.exportFiles(volumeId, items, uri)
-                        Toast.makeText(this@ExplorerActivity, R.string.success_export, Toast.LENGTH_SHORT).show()
+                onTaskResult(result, R.string.export_failed, R.string.success_export)
-                    } else {
-                        CustomAlertDialogBuilder(this@ExplorerActivity, themeValue)
-                            .setTitle(R.string.error)
-                            .setMessage(getString(R.string.export_failed, result.failedItem))
-                            .setPositiveButton(R.string.ok, null)
-                            .show()
-                    }
-                }
             }
         }
         unselectAll()
     }
     private val pickImportDirectory = registerForActivityResult(ActivityResultContracts.OpenDocumentTree()) { rootUri ->
         rootUri?.let {
+            contentResolver.takePersistableUriPermission(it, Intent.FLAG_GRANT_READ_URI_PERMISSION)
             val tree = DocumentFile.fromTreeUri(this, it)!! //non-null after Lollipop
-            val operation = OperationFile.fromExplorerElement(ExplorerElement(tree.name!!, 0, parentPath = currentDirectoryPath))
+            val operation = OperationFile(PathUtils.pathJoin(currentDirectoryPath, tree.name!!), Stat.S_IFDIR)
             checkPathOverwrite(arrayListOf(operation), currentDirectoryPath) { checkedOperation ->
                 checkedOperation?.let {
-                    lifecycleScope.launch {
+                    activityScope.launch {
-                        val result = fileOperationService.importDirectory(checkedOperation[0].dstPath!!, tree)
+                        val result = fileOperationService.importDirectory(volumeId, checkedOperation[0].dstPath!!, tree)
-                        if (result.taskResult.cancelled) {
+                        onTaskResult(result.taskResult, R.string.import_failed) {
-                            setCurrentPath(currentDirectoryPath)
+                            onImportComplete(result.uris, tree)
-                        } else {
-                            onImportComplete(result.taskResult.failedItem, result.uris, tree)
                         }
+                        setCurrentPath(currentDirectoryPath)
                     }
                 }
             }
         }
     }
 
-    private fun onImportComplete(failedItem: String?, urisToWipe: List<Uri>, rootFile: DocumentFile? = null) {
+    private fun importFilesFromVolume(srcVolumeId: Int, operationFiles: List<OperationFile>) {
-        if (failedItem == null){
+        checkPathOverwrite(operationFiles, currentDirectoryPath) { items ->
-            CustomAlertDialogBuilder(this, themeValue)
+            if (items != null) {
-                .setTitle(R.string.success_import)
+                // stop loading thumbnails while writing files
-                .setMessage("""
+                explorerAdapter.loadThumbnails = false
-                                ${getString(R.string.success_import_msg)}
+                activityScope.launch {
-                                ${getString(R.string.ask_for_wipe)}
+                    onTaskResult(
-                                """.trimIndent())
+                        fileOperationService.copyElements(
-                .setPositiveButton(R.string.yes) { _, _ ->
+                            volumeId,
-                    lifecycleScope.launch {
+                            items,
-                        val errorMsg = fileOperationService.wipeUris(urisToWipe, rootFile)
+                            srcVolumeId
-                        if (errorMsg == null) {
+                        ), R.string.import_failed, R.string.success_import
-                            Toast.makeText(this@ExplorerActivity, R.string.wipe_successful, Toast.LENGTH_SHORT).show()
+                    )
-                        } else {
+                    explorerAdapter.loadThumbnails = true
-                            CustomAlertDialogBuilder(this@ExplorerActivity, themeValue)
+                    setCurrentPath(currentDirectoryPath)
-                                .setTitle(R.string.error)
-                                .setMessage(getString(R.string.wipe_failed, errorMsg))
-                                .setPositiveButton(R.string.ok, null)
-                                .show()
-                        }
-                    }
                 }
-                .setNegativeButton(R.string.no, null)
+            }
-                .show()
-        } else {
-            CustomAlertDialogBuilder(this, themeValue)
-                .setTitle(R.string.error)
-                .setMessage(getString(R.string.import_failed, failedItem))
-                .setPositiveButton(R.string.ok, null)
-                .show()
         }
-        setCurrentPath(currentDirectoryPath)
+
+    }
+
+    private fun onImportComplete(urisToWipe: List<Uri>, rootFile: DocumentFile? = null) {
+        CustomAlertDialogBuilder(this, theme)
+            .setTitle(R.string.success_import)
+            .setMessage("""
+                            ${getString(R.string.success_import_msg)}
+                            ${getString(R.string.ask_for_wipe)}
+                            """.trimIndent())
+            .setPositiveButton(R.string.yes) { _, _ ->
+                activityScope.launch {
+                    onTaskResult(
+                        fileOperationService.wipeUris(urisToWipe, rootFile),
+                        R.string.wipe_failed,
+                        R.string.wipe_successful,
+                    )
+                }
+            }
+            .setNegativeButton(R.string.no, null)
+            .show()
     }
 
     override fun init() {
-        binding = ActivityExplorerBinding.inflate(layoutInflater)
+        super.init()
-        setContentView(binding.root)
+        onBackPressedDispatcher.addCallback(this) {
-        binding.fab.setOnClickListener {
+            if (currentItemAction != ItemsActions.NONE) {
+                cancelItemAction()
+                invalidateOptionsMenu()
+            } else {
+                isEnabled = false
+                onBackPressedDispatcher.onBackPressed()
+                isEnabled = true
+            }
+        }
+        findViewById<FloatingActionButton>(R.id.fab).setOnClickListener {
             if (currentItemAction != ItemsActions.NONE){
                 openDialogCreateFolder()
             } else {
                 val adapter = IconTextDialogAdapter(this)
                 adapter.items = listOf(
-                    listOf("importFromOtherVolumes", R.string.import_from_other_volume, R.drawable.icon_transfert),
+                    listOf("importFromOtherVolumes", R.string.import_from_other_volume, R.drawable.icon_transfer),
                     listOf("importFiles", R.string.import_files, R.drawable.icon_encrypt),
                     listOf("importFolder", R.string.import_folder, R.drawable.icon_import_folder),
                     listOf("createFile", R.string.new_file, R.drawable.icon_file_unknown),
                     listOf("createFolder", R.string.mkdir, R.drawable.icon_create_new_folder),
                     listOf("camera", R.string.camera, R.drawable.icon_photo)
                 )
-                CustomAlertDialogBuilder(this, themeValue)
+                CustomAlertDialogBuilder(this, theme)
                     .setSingleChoiceItems(adapter, -1){ thisDialog, which ->
                         when (adapter.getItem(which)){
                             "importFromOtherVolumes" -> {
                                 val intent = Intent(this, MainActivity::class.java)
                                 intent.action = "pick"
-                                intent.putExtra("sessionID", gocryptfsVolume.sessionID)
+                                intent.putExtra("volume", encryptedVolume)
-                                isStartingActivity = true
                                 pickFromOtherVolumes.launch(intent)
                             }
                             "importFiles" -> {
-                                isStartingActivity = true
+                                app.isStartingExternalApp = true
                                 pickFiles.launch(arrayOf("*/*"))
                             }
                             "importFolder" -> {
-                                isStartingActivity = true
+                                app.isStartingExternalApp = true
                                 pickImportDirectory.launch(null)
                             }
                             "createFile" -> {
@@ -215,8 +199,7 @@ class ExplorerActivity : BaseExplorerActivity() {
                             "camera" -> {
                                 val intent = Intent(this, CameraActivity::class.java)
                                 intent.putExtra("path", currentDirectoryPath)
-                                intent.putExtra("sessionID", gocryptfsVolume.sessionID)
+                                intent.putExtra("volume", encryptedVolume)
-                                isStartingActivity = true
                                 startActivity(intent)
                             }
                         }
@@ -241,15 +224,15 @@ class ExplorerActivity : BaseExplorerActivity() {
             Toast.makeText(this, R.string.error_filename_empty, Toast.LENGTH_SHORT).show()
         } else {
             val filePath = PathUtils.pathJoin(currentDirectoryPath, fileName)
-            val handleID = gocryptfsVolume.openWriteMode(filePath) //don't check overwrite because openWriteMode open in read-write (doesn't erase content)
+            val handleID = encryptedVolume.openFileWriteMode(filePath)
-            if (handleID == -1) {
+            if (handleID == -1L) {
-                CustomAlertDialogBuilder(this, themeValue)
+                CustomAlertDialogBuilder(this, theme)
                         .setTitle(R.string.error)
                         .setMessage(R.string.file_creation_failed)
                         .setPositiveButton(R.string.ok, null)
                         .show()
             } else {
-                gocryptfsVolume.closeFile(handleID)
+                encryptedVolume.closeFile(handleID)
                 setCurrentPath(currentDirectoryPath)
                 invalidateOptionsMenu()
             }
@@ -258,11 +241,13 @@ class ExplorerActivity : BaseExplorerActivity() {
 
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
         menuInflater.inflate(R.menu.explorer, menu)
+        val result = super.onCreateOptionsMenu(menu)
         if (currentItemAction != ItemsActions.NONE) {
             menu.findItem(R.id.validate).isVisible = true
+            menu.findItem(R.id.lock).isVisible = false
             menu.findItem(R.id.close).isVisible = false
+            supportActionBar?.setDisplayHomeAsUpEnabled(true)
         } else {
-            handleMenuItems(menu)
             if (usf_share){
                 menu.findItem(R.id.share).isVisible = false
             }
@@ -285,7 +270,7 @@ class ExplorerActivity : BaseExplorerActivity() {
                 }
             }
         }
-        return true
+        return result
     }
 
     override fun onOptionsItemSelected(item: MenuItem): Boolean {
@@ -310,11 +295,6 @@ class ExplorerActivity : BaseExplorerActivity() {
             R.id.copy -> {
                 for (i in explorerAdapter.selectedItems){
                     itemsToProcess.add(OperationFile.fromExplorerElement(explorerElements[i]))
-                    if (explorerElements[i].isDirectory){
-                        gocryptfsVolume.recursiveMapFiles(explorerElements[i].fullPath).forEach {
-                            itemsToProcess.add(OperationFile.fromExplorerElement(it))
-                        }
-                    }
                 }
                 currentItemAction = ItemsActions.COPY
                 unselectAll()
@@ -322,50 +302,50 @@ class ExplorerActivity : BaseExplorerActivity() {
             }
             R.id.validate -> {
                 if (currentItemAction == ItemsActions.COPY){
-                    checkPathOverwrite(itemsToProcess, currentDirectoryPath){ items ->
+                    object : LoadingTask<List<OperationFile>>(this, theme, R.string.discovering_files) {
-                        items?.let {
+                        override suspend fun doTask(): List<OperationFile> {
-                            lifecycleScope.launch {
+                            val items = itemsToProcess.toMutableList()
-                                val failedItem = fileOperationService.copyElements(it.toMutableList() as ArrayList<OperationFile>)
+                            itemsToProcess.filter { it.isDirectory }.forEach { dir ->
-                                if (!isFinishing) {
+                                encryptedVolume.recursiveMapFiles(dir.srcPath)?.forEach {
-                                    if (failedItem == null) {
+                                    items.add(OperationFile.fromExplorerElement(it))
-                                        Toast.makeText(this@ExplorerActivity, R.string.copy_success, Toast.LENGTH_SHORT).show()
+                                }
-                                    } else {
+                            }
-                                        CustomAlertDialogBuilder(this@ExplorerActivity, themeValue)
+                            return items
-                                            .setTitle(R.string.error)
+                        }
-                                            .setMessage(getString(R.string.copy_failed, failedItem))
+                    }.startTask(lifecycleScope) { items ->
-                                            .setPositiveButton(R.string.ok, null)
+                        checkPathOverwrite(items, currentDirectoryPath) {
-                                            .show()
+                            it?.let { checkedItems ->
-                                    }
+                                activityScope.launch {
+                                    onTaskResult(
+                                        fileOperationService.copyElements(volumeId, checkedItems),
+                                        R.string.copy_failed,
+                                        R.string.copy_success,
+                                    )
                                     setCurrentPath(currentDirectoryPath)
                                 }
                             }
+                            cancelItemAction()
+                            invalidateOptionsMenu()
                         }
-                        cancelItemAction()
-                        invalidateOptionsMenu()
                     }
                 } else if (currentItemAction == ItemsActions.MOVE){
                     itemsToProcess.forEach {
-                        it.dstPath = PathUtils.pathJoin(currentDirectoryPath, it.explorerElement.name)
+                        it.dstPath = PathUtils.pathJoin(currentDirectoryPath, it.name)
                         it.overwriteConfirmed = false // reset the field in case of a previous cancelled move
                     }
                     val toMove = ArrayList<OperationFile>(itemsToProcess.size)
-                    val toClean = ArrayList<ExplorerElement>()
+                    val toClean = ArrayList<String>()
                     prepareFilesForMove(
                         itemsToProcess,
                         toMove,
                         toClean,
                     ) {
-                        lifecycleScope.launch {
+                        activityScope.launch {
-                            val failedItem = fileOperationService.moveElements(toMove, toClean)
+                            onTaskResult(
-                            if (failedItem == null) {
+                                fileOperationService.moveElements(volumeId, toMove, toClean),
-                                Toast.makeText(this@ExplorerActivity, R.string.move_success, Toast.LENGTH_SHORT).show()
+                                R.string.move_success,
-                            } else {
+                                R.string.move_failed,
-                                CustomAlertDialogBuilder(this@ExplorerActivity, themeValue)
+                            )
-                                    .setTitle(R.string.error)
-                                    .setMessage(getString(R.string.move_failed, failedItem))
-                                    .setPositiveButton(R.string.ok, null)
-                                    .show()
-                            }
                             setCurrentPath(currentDirectoryPath)
                         }
                         cancelItemAction()
@@ -376,9 +356,22 @@ class ExplorerActivity : BaseExplorerActivity() {
             }
             R.id.delete -> {
                 val size = explorerAdapter.selectedItems.size
-                val dialog = CustomAlertDialogBuilder(this, themeValue)
+                val dialog = CustomAlertDialogBuilder(this, theme)
                 dialog.setTitle(R.string.warning)
-                dialog.setPositiveButton(R.string.ok) { _, _ -> removeSelectedItems() }
+                dialog.setPositiveButton(R.string.ok) { _, _ ->
+                    val items = explorerAdapter.selectedItems.map { i -> explorerElements[i] }
+                    activityScope.launch {
+                        fileOperationService.removeElements(volumeId, items)?.let { failedItem ->
+                            CustomAlertDialogBuilder(this@ExplorerActivity, theme)
+                                .setTitle(R.string.error)
+                                .setMessage(getString(R.string.remove_failed, failedItem))
+                                .setPositiveButton(R.string.ok, null)
+                                .show()
+                        }
+                        setCurrentPath(currentDirectoryPath) //refresh
+                    }
+                    unselectAll()
+                }
                 dialog.setNegativeButton(R.string.cancel, null)
                 if (size > 1) {
                     dialog.setMessage(getString(R.string.multiple_delete_confirm, explorerAdapter.selectedItems.size.toString()))
@@ -392,17 +385,30 @@ class ExplorerActivity : BaseExplorerActivity() {
                 true
             }
             R.id.share -> {
-                val paths: MutableList<String> = ArrayList()
+                val files = explorerAdapter.selectedItems.map { i ->
-                for (i in explorerAdapter.selectedItems) {
+                    explorerElements[i].let {
-                    paths.add(explorerElements[i].fullPath)
+                        Pair(it.fullPath, it.stat.size)
+                    }
+                }
+                app.isExporting = true
+                object : LoadingTask<Pair<Intent?, Int?>>(this, theme, R.string.loading_msg_export) {
+                    override suspend fun doTask(): Pair<Intent?, Int?> {
+                        return fileShare.share(files, volumeId)
+                    }
+                }.startTask(lifecycleScope) { (intent, error) ->
+                    if (intent == null) {
+                        onExportFailed(error!!)
+                    } else {
+                        app.isStartingExternalApp = true
+                        startActivity(Intent.createChooser(intent, getString(R.string.share_chooser)))
+                    }
+                    app.isExporting = false
                 }
-                isStartingActivity = true
-                ExternalProvider.share(this, themeValue, gocryptfsVolume, paths)
                 unselectAll()
                 true
             }
             R.id.decrypt -> {
-                isStartingActivity = true
+                app.isStartingExternalApp = true
                 pickExportDirectory.launch(null)
                 true
             }
@@ -417,12 +423,12 @@ class ExplorerActivity : BaseExplorerActivity() {
      */
     private fun checkMoveOverwrite(items: List<OperationFile>, callback: (List<OperationFile>?) -> Unit) {
         for (item in items) {
-            if (gocryptfsVolume.pathExists(item.dstPath!!) && !item.overwriteConfirmed) {
+            if (encryptedVolume.pathExists(item.dstPath!!) && !item.overwriteConfirmed) {
-                CustomAlertDialogBuilder(this, themeValue)
+                CustomAlertDialogBuilder(this, theme)
                     .setTitle(R.string.warning)
                     .setMessage(
                         getString(
-                            if (item.explorerElement.isDirectory) {
+                            if (item.isDirectory) {
                                 R.string.dir_overwrite_question
                             } else {
                                 R.string.file_overwrite_question
@@ -439,7 +445,7 @@ class ExplorerActivity : BaseExplorerActivity() {
                             item.dstPath = PathUtils.pathJoin(PathUtils.getParentPath(item.dstPath!!), it)
                             checkMoveOverwrite(items, callback)
                         }) {
-                            setSelectedText(item.explorerElement.name)
+                            setSelectedText(item.name)
                             show()
                         }
                     }
@@ -462,24 +468,24 @@ class ExplorerActivity : BaseExplorerActivity() {
     private fun prepareFilesForMove(
         items: List<OperationFile>,
         toMove: ArrayList<OperationFile>,
-        toClean: ArrayList<ExplorerElement>,
+        toClean: ArrayList<String>,
         onReady: () -> Unit
     ) {
         checkMoveOverwrite(items) { checkedItems ->
             checkedItems?.let {
                 for (item in checkedItems) {
-                    if (!item.overwriteConfirmed || !item.explorerElement.isDirectory) {
+                    if (!item.overwriteConfirmed || !item.isDirectory) {
                         toMove.add(item)
                     }
                 }
                 val toCheck = mutableListOf<OperationFile>()
                 for (item in checkedItems) {
-                    if (item.overwriteConfirmed && item.explorerElement.isDirectory) {
+                    if (item.overwriteConfirmed && item.isDirectory) {
-                        val children = gocryptfsVolume.listDir(item.explorerElement.fullPath)
+                        val children = encryptedVolume.readDir(item.srcPath)
-                        toCheck.addAll(children.map {
+                        children?.map {
-                            OperationFile(it, PathUtils.pathJoin(item.dstPath!!, it.name))
+                            OperationFile(it.fullPath, it.stat.type, PathUtils.pathJoin(item.dstPath!!, it.name))
-                        })
+                        }?.let { toCheck.addAll(it) }
-                        toClean.add(item.explorerElement)
+                        toClean.add(item.srcPath)
                     }
                 }
                 if (toCheck.isEmpty()) {
@@ -497,38 +503,4 @@ class ExplorerActivity : BaseExplorerActivity() {
             itemsToProcess.clear()
         }
     }
-
-    override fun onBackPressed() {
-        if (currentItemAction != ItemsActions.NONE) {
-            cancelItemAction()
-            invalidateOptionsMenu()
-        } else {
-            super.onBackPressed()
-        }
-    }
-
-    private fun removeSelectedItems() {
-        var failedItem: String? = null
-        for (i in explorerAdapter.selectedItems) {
-            val element = explorerAdapter.explorerElements[i]
-            val fullPath = PathUtils.pathJoin(currentDirectoryPath, element.name)
-            if (element.isDirectory) {
-                val result = gocryptfsVolume.recursiveRemoveDirectory(fullPath)
-                result?.let{ failedItem = it }
-            } else {
-                if (!gocryptfsVolume.removeFile(fullPath)) {
-                    failedItem = fullPath
-                }
-            }
-            if (failedItem != null) {
-                CustomAlertDialogBuilder(this, themeValue)
-                        .setTitle(R.string.error)
-                        .setMessage(getString(R.string.remove_failed, failedItem))
-                        .setPositiveButton(R.string.ok, null)
-                        .show()
-                break
-            }
-        }
-        setCurrentPath(currentDirectoryPath) //refresh
-    }
 }

app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerActivityDrop.kt

@@ -2,28 +2,28 @@ package sushi.hardcore.droidfs.explorers
 
 import android.content.Intent
 import android.net.Uri
+import android.os.Build
 import android.view.Menu
 import android.view.MenuItem
+import com.google.android.material.floatingactionbutton.FloatingActionButton
 import sushi.hardcore.droidfs.R
-import sushi.hardcore.droidfs.databinding.ActivityExplorerDropBinding
+import sushi.hardcore.droidfs.util.IntentUtils
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 
 class ExplorerActivityDrop : BaseExplorerActivity() {
-    private lateinit var binding: ActivityExplorerDropBinding
 
     override fun init() {
-        binding = ActivityExplorerDropBinding.inflate(layoutInflater)
+        super.init()
-        setContentView(binding.root)
+        findViewById<FloatingActionButton>(R.id.fab).setOnClickListener {
-        binding.fab.setOnClickListener {
             openDialogCreateFolder()
         }
     }
 
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
         menuInflater.inflate(R.menu.explorer_drop, menu)
-        handleMenuItems(menu)
+        val result = super.onCreateOptionsMenu(menu)
         menu.findItem(R.id.validate).isVisible = explorerAdapter.selectedItems.isEmpty()
-        return true
+        return result
     }
 
     override fun onOptionsItemSelected(item: MenuItem): Boolean {
@@ -33,7 +33,7 @@ class ExplorerActivityDrop : BaseExplorerActivity() {
                 val errorMsg: String? = if (extras != null && extras.containsKey(Intent.EXTRA_STREAM)) {
                     when (intent.action) {
                         Intent.ACTION_SEND -> {
-                            val uri = intent.getParcelableExtra<Uri>(Intent.EXTRA_STREAM)
+                            val uri = IntentUtils.getParcelableExtra<Uri>(intent, Intent.EXTRA_STREAM)
                             if (uri == null) {
                                 getString(R.string.share_intent_parsing_failed)
                             } else {
@@ -42,7 +42,12 @@ class ExplorerActivityDrop : BaseExplorerActivity() {
                             }
                         }
                         Intent.ACTION_SEND_MULTIPLE -> {
-                            val uris = intent.getParcelableArrayListExtra<Uri>(Intent.EXTRA_STREAM)
+                            val uris: List<Uri>? = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+                                intent.getParcelableArrayListExtra(Intent.EXTRA_STREAM, Uri::class.java)
+                            } else {
+                                @Suppress("Deprecation")
+                                intent.getParcelableArrayListExtra(Intent.EXTRA_STREAM)
+                            }
                             if (uris != null) {
                                 importFilesFromUris(uris, ::onImported)
                                 null
@@ -56,7 +61,7 @@ class ExplorerActivityDrop : BaseExplorerActivity() {
                     getString(R.string.share_intent_parsing_failed)
                 }
                 errorMsg?.let {
-                    CustomAlertDialogBuilder(this, themeValue)
+                    CustomAlertDialogBuilder(this, theme)
                             .setTitle(R.string.error)
                             .setMessage(it)
                             .setPositiveButton(R.string.ok, null)
@@ -68,23 +73,15 @@ class ExplorerActivityDrop : BaseExplorerActivity() {
         }
     }
 
-    private fun onImported(failedItem: String?){
+    private fun onImported() {
         setCurrentPath(currentDirectoryPath)
-        if (failedItem == null) {
+        CustomAlertDialogBuilder(this, theme)
-            CustomAlertDialogBuilder(this, themeValue)
+            .setTitle(R.string.success_import)
-                    .setTitle(R.string.success_import)
+            .setMessage(R.string.success_import_msg)
-                    .setMessage(R.string.success_import_msg)
+            .setCancelable(false)
-                    .setCancelable(false)
+            .setPositiveButton(R.string.ok) { _, _ ->
-                    .setPositiveButton(R.string.ok){_, _ ->
+                finish()
-                        finish()
+            }
-                    }
+            .show()
-                    .show()
-        } else {
-            CustomAlertDialogBuilder(this, themeValue)
-                    .setTitle(R.string.error)
-                    .setMessage(getString(R.string.import_failed, failedItem))
-                    .setPositiveButton(R.string.ok, null)
-                    .show()
-        }
     }
 }

app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerActivityPick.kt

@@ -5,16 +5,16 @@ import android.content.Intent
 import android.view.Menu
 import android.view.MenuItem
 import sushi.hardcore.droidfs.R
-import sushi.hardcore.droidfs.GocryptfsVolume
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.util.IntentUtils
 import sushi.hardcore.droidfs.util.PathUtils
-import java.util.*
 
 class ExplorerActivityPick : BaseExplorerActivity() {
     private var resultIntent = Intent()
     private var isFinishingIntentionally = false
     override fun init() {
-        super.init()
+        setContentView(R.layout.activity_explorer_pick)
-        resultIntent.putExtra("sessionID", gocryptfsVolume.sessionID)
+        resultIntent.putExtra("volumeId", volumeId)
     }
 
     override fun bindFileOperationService() {
@@ -22,21 +22,18 @@ class ExplorerActivityPick : BaseExplorerActivity() {
     }
 
     override fun onExplorerElementClick(position: Int) {
-        val wasSelecting = explorerAdapter.selectedItems.isNotEmpty()
         if (explorerAdapter.selectedItems.isEmpty()) {
-            if (!wasSelecting) {
+            val fullPath = PathUtils.pathJoin(currentDirectoryPath, explorerElements[position].name)
-                val fullPath = PathUtils.pathJoin(currentDirectoryPath, explorerElements[position].name)
+            when {
-                when {
+                explorerElements[position].isDirectory -> {
-                    explorerElements[position].isDirectory -> {
+                    setCurrentPath(fullPath)
-                        setCurrentPath(fullPath)
+                }
-                    }
+                explorerElements[position].isParentFolder -> {
-                    explorerElements[position].isParentFolder -> {
+                    setCurrentPath(PathUtils.getParentPath(currentDirectoryPath))
-                        setCurrentPath(PathUtils.getParentPath(currentDirectoryPath))
+                }
-                    }
+                else -> {
-                    else -> {
+                    resultIntent.putExtra("path", fullPath)
-                        resultIntent.putExtra("path", fullPath)
+                    returnActivityResult()
-                        returnActivityResult()
-                    }
                 }
             }
         }
@@ -45,11 +42,11 @@ class ExplorerActivityPick : BaseExplorerActivity() {
 
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
         menuInflater.inflate(R.menu.explorer_pick, menu)
-        handleMenuItems(menu)
+        val result = super.onCreateOptionsMenu(menu)
         val anyItemSelected = explorerAdapter.selectedItems.isNotEmpty()
         menu.findItem(R.id.select_all).isVisible = anyItemSelected
         menu.findItem(R.id.validate).isVisible = anyItemSelected
-        return true
+        return result
     }
 
     override fun onOptionsItemSelected(item: MenuItem): Boolean {
@@ -65,7 +62,7 @@ class ExplorerActivityPick : BaseExplorerActivity() {
                 for (i in explorerAdapter.selectedItems) {
                     val e = explorerElements[i]
                     paths.add(PathUtils.pathJoin(currentDirectoryPath, e.name))
-                    types.add(e.elementType.toInt())
+                    types.add(e.stat.type)
                 }
                 resultIntent.putStringArrayListExtra("paths", paths)
                 resultIntent.putIntegerArrayListExtra("types", types)
@@ -81,20 +78,4 @@ class ExplorerActivityPick : BaseExplorerActivity() {
         isFinishingIntentionally = true
         finish()
     }
-
-    override fun closeVolumeOnDestroy() {
-        if (!isFinishingIntentionally && !usf_keep_open){
-            val sessionID = intent.getIntExtra("originalSessionID", -1)
-            if (sessionID != -1){
-                GocryptfsVolume(applicationContext, sessionID).close()
-            }
-            super.closeVolumeOnDestroy()
-        }
-    }
-
-    override fun closeVolumeOnUserExit() {
-        isFinishingIntentionally = true
-        super.closeVolumeOnUserExit()
-        super.closeVolumeOnDestroy()
-    }
 }

app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerElement.kt

@@ -1,33 +1,31 @@
 package sushi.hardcore.droidfs.explorers
 
 import sushi.hardcore.droidfs.collation.getCollationKeyForFileName
+import sushi.hardcore.droidfs.filesystems.Stat
 import sushi.hardcore.droidfs.util.PathUtils
 import java.text.Collator
-import java.util.*
 
-class ExplorerElement(val name: String, val elementType: Short, var size: Long = -1, mTime: Long = -1, val parentPath: String) {
+class ExplorerElement(val name: String, val stat: Stat, val parentPath: String) {
-    val mTime = Date((mTime * 1000).toString().toLong())
+    val fullPath: String = PathUtils.pathJoin(parentPath.ifEmpty { "/" }, name)
-    val fullPath: String = PathUtils.pathJoin(parentPath, name)
     val collationKey = Collator.getInstance().getCollationKeyForFileName(fullPath)
 
     val isDirectory: Boolean
-        get() = elementType.toInt() == DIRECTORY_TYPE
+        get() = stat.type == Stat.S_IFDIR
-
-    val isParentFolder: Boolean
-        get() = elementType.toInt() == PARENT_FOLDER_TYPE
 
     val isRegularFile: Boolean
-        get() = elementType.toInt() == REGULAR_FILE_TYPE
+        get() = stat.type == Stat.S_IFREG
+
+    val isSymlink: Boolean
+        get() = stat.type == Stat.S_IFLNK
+
+    val isParentFolder: Boolean
+        get() = stat.type == Stat.PARENT_FOLDER_TYPE
 
     companion object {
-        const val DIRECTORY_TYPE = 0
-        const val PARENT_FOLDER_TYPE = -1
-        const val REGULAR_FILE_TYPE = 1
-
         @JvmStatic
         //this function is needed because I had some problems calling the constructor from JNI, probably due to arguments with default values
-        fun new(name: String, elementType: Short, size: Long, mTime: Long, parentPath: String): ExplorerElement {
+        fun new(name: String, elementType: Int, size: Long, mTime: Long, parentPath: String): ExplorerElement {
-            return ExplorerElement(name, elementType, size, mTime, parentPath)
+            return ExplorerElement(name, Stat(elementType, size, mTime*1000), parentPath)
         }
 
         private fun foldersFirst(a: ExplorerElement, b: ExplorerElement, default: () -> Int): Int {
@@ -61,12 +59,12 @@ class ExplorerElement(val name: String, val elementType: Short, var size: Long =
                 }
                 "size" -> {
                     explorerElements.sortWith { a, b ->
-                        doSort(a, b, foldersFirst) { (a.size - b.size).toInt() }
+                        doSort(a, b, foldersFirst) { (a.stat.size - b.stat.size).toInt() }
                     }
                 }
                 "date" -> {
                     explorerElements.sortWith { a, b ->
-                        doSort(a, b, foldersFirst) { a.mTime.compareTo(b.mTime) }
+                        doSort(a, b, foldersFirst) { a.stat.mTime.compareTo(b.stat.mTime) }
                     }
                 }
                 "name_desc" -> {
@@ -76,12 +74,12 @@ class ExplorerElement(val name: String, val elementType: Short, var size: Long =
                 }
                 "size_desc" -> {
                     explorerElements.sortWith { a, b ->
-                        doSort(a, b, foldersFirst) { (b.size - a.size).toInt() }
+                        doSort(a, b, foldersFirst) { (b.stat.size - a.stat.size).toInt() }
                     }
                 }
                 "date_desc" -> {
                     explorerElements.sortWith { a, b ->
-                        doSort(a, b, foldersFirst) { b.mTime.compareTo(a.mTime) }
+                        doSort(a, b, foldersFirst) { b.stat.mTime.compareTo(a.stat.mTime) }
                     }
                 }
             }

app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerRouter.kt

@@ -0,0 +1,27 @@
+package sushi.hardcore.droidfs.explorers
+
+import android.content.Context
+import android.content.Intent
+import sushi.hardcore.droidfs.util.IntentUtils
+
+class ExplorerRouter(private val context: Context, private val intent: Intent) {
+    var pickMode = intent.action == "pick"
+    var dropMode = (intent.action == Intent.ACTION_SEND || intent.action == Intent.ACTION_SEND_MULTIPLE) && intent.extras != null
+
+    fun getExplorerIntent(volumeId: Int, volumeShortName: String): Intent {
+        var explorerIntent: Intent? = null
+        if (dropMode) { //import via android share menu
+            explorerIntent = Intent(context, ExplorerActivityDrop::class.java)
+            IntentUtils.forwardIntent(intent, explorerIntent)
+        } else if (pickMode) {
+            explorerIntent = Intent(context, ExplorerActivityPick::class.java)
+            explorerIntent.flags = Intent.FLAG_ACTIVITY_FORWARD_RESULT
+        }
+        if (explorerIntent == null) {
+            explorerIntent = Intent(context, ExplorerActivity::class.java) //default opening
+        }
+        explorerIntent.putExtra("volumeId", volumeId)
+        explorerIntent.putExtra("volumeName", volumeShortName)
+        return explorerIntent
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/file_operations/FileOperationService.kt

@@ -13,10 +13,23 @@ import android.os.IBinder
 import androidx.core.app.NotificationCompat
 import androidx.core.app.NotificationManagerCompat
 import androidx.documentfile.provider.DocumentFile
-import kotlinx.coroutines.*
+import kotlinx.coroutines.CancellationException
-import sushi.hardcore.droidfs.GocryptfsVolume
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Deferred
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.MainScope
+import kotlinx.coroutines.async
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.withContext
+import kotlinx.coroutines.yield
+import sushi.hardcore.droidfs.Constants
 import sushi.hardcore.droidfs.R
+import sushi.hardcore.droidfs.VolumeManager
+import sushi.hardcore.droidfs.VolumeManagerApp
 import sushi.hardcore.droidfs.explorers.ExplorerElement
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.util.ObjRef
 import sushi.hardcore.droidfs.util.PathUtils
 import sushi.hardcore.droidfs.util.Wiper
 import java.io.File
@@ -29,19 +42,18 @@ class FileOperationService : Service() {
     }
 
     private val binder = LocalBinder()
-    private lateinit var gocryptfsVolume: GocryptfsVolume
+    private lateinit var volumeManger: VolumeManager
+    private var serviceScope = MainScope()
     private lateinit var notificationManager: NotificationManagerCompat
     private val tasks = HashMap<Int, Job>()
     private var lastNotificationId = 0
 
     inner class LocalBinder : Binder() {
         fun getService(): FileOperationService = this@FileOperationService
-        fun setGocryptfsVolume(g: GocryptfsVolume) {
-            gocryptfsVolume = g
-        }
     }
 
     override fun onBind(p0: Intent?): IBinder {
+        volumeManger = (application as VolumeManagerApp).volumeManager
         return binder
     }
 
@@ -62,7 +74,7 @@ class FileOperationService : Service() {
         val notificationBuilder = NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID)
         notificationBuilder
                 .setContentTitle(getString(message))
-                .setSmallIcon(R.mipmap.icon_launcher)
+                .setSmallIcon(R.drawable.ic_notification)
                 .setOngoing(true)
                 .addAction(NotificationCompat.Action(
                     R.drawable.icon_close,
@@ -77,7 +89,7 @@ class FileOperationService : Service() {
                             putExtra("bundle", bundle)
                             action = ACTION_CANCEL
                         },
-                        PendingIntent.FLAG_UPDATE_CURRENT
+                        PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
                     )
                 ))
         if (total != null) {
@@ -108,42 +120,71 @@ class FileOperationService : Service() {
         tasks[notificationId]?.cancel()
     }
 
-    open class TaskResult<T>(val cancelled: Boolean, val failedItem: T?)
+    private fun getEncryptedVolume(volumeId: Int): EncryptedVolume {
+        return volumeManger.getVolume(volumeId) ?: throw IllegalArgumentException("Invalid volumeId: $volumeId")
+    }
 
-    private suspend fun <T> waitForTask(notification: FileOperationNotification, task: Deferred<T>): TaskResult<T> {
+    private suspend fun <T> waitForTask(notification: FileOperationNotification, task: Deferred<T>): TaskResult<out T> {
         tasks[notification.notificationId] = task
-        return try {
+        return coroutineScope {
-            TaskResult(false, task.await())
+            withContext(serviceScope.coroutineContext) {
-        } catch (e: CancellationException) {
+                try {
-            TaskResult(true, null)
+                    TaskResult.completed(task.await())
-        } finally {
+                } catch (e: CancellationException) {
-            cancelNotification(notification)
+                    TaskResult.cancelled()
+                } catch (e: Throwable) {
+                    e.printStackTrace()
+                    TaskResult.error(e.localizedMessage)
+                } finally {
+                    cancelNotification(notification)
+                }
+            }
         }
     }
 
-    private fun copyFile(srcPath: String, dstPath: String, remoteGocryptfsVolume: GocryptfsVolume = gocryptfsVolume): Boolean {
+    private suspend fun <T> volumeTask(
+        volumeId: Int,
+        notification: FileOperationNotification,
+        task: suspend (encryptedVolume: EncryptedVolume) -> T
+    ): TaskResult<out T> {
+        return waitForTask(
+            notification,
+            volumeManger.getCoroutineScope(volumeId).async {
+                task(getEncryptedVolume(volumeId))
+            }
+        )
+    }
+
+    private suspend fun copyFile(
+        encryptedVolume: EncryptedVolume,
+        srcPath: String,
+        dstPath: String,
+        srcEncryptedVolume: EncryptedVolume = encryptedVolume,
+    ): Boolean {
         var success = true
-        val srcHandleId = remoteGocryptfsVolume.openReadMode(srcPath)
+        val srcFileHandle = srcEncryptedVolume.openFileReadMode(srcPath)
-        if (srcHandleId != -1){
+        if (srcFileHandle != -1L) {
-            val dstHandleId = gocryptfsVolume.openWriteMode(dstPath)
+            val dstFileHandle = encryptedVolume.openFileWriteMode(dstPath)
-            if (dstHandleId != -1){
+            if (dstFileHandle != -1L) {
                 var offset: Long = 0
-                val ioBuffer = ByteArray(GocryptfsVolume.DefaultBS)
+                val ioBuffer = ByteArray(Constants.IO_BUFF_SIZE)
-                var length: Int
+                var length: Long
-                while (remoteGocryptfsVolume.readFile(srcHandleId, offset, ioBuffer).also { length = it } > 0) {
+                while (srcEncryptedVolume.read(srcFileHandle, offset, ioBuffer, 0, ioBuffer.size.toLong()).also { length = it.toLong() } > 0) {
-                    val written = gocryptfsVolume.writeFile(dstHandleId, offset, ioBuffer, length).toLong()
+                    yield()
-                    if (written == length.toLong()) {
+                    val written = encryptedVolume.write(dstFileHandle, offset, ioBuffer, 0, length).toLong()
+                    if (written == length) {
                         offset += written
                     } else {
                         success = false
                         break
                     }
                 }
-                gocryptfsVolume.closeFile(dstHandleId)
+                encryptedVolume.truncate(dstPath, offset)
+                encryptedVolume.closeFile(dstFileHandle)
             } else {
                 success = false
             }
-            remoteGocryptfsVolume.closeFile(srcHandleId)
+            srcEncryptedVolume.closeFile(srcFileHandle)
         } else {
             success = false
         }
@@ -151,25 +192,24 @@ class FileOperationService : Service() {
     }
 
     suspend fun copyElements(
-        items: ArrayList<OperationFile>,
+        volumeId: Int,
-        remoteGocryptfsVolume: GocryptfsVolume = gocryptfsVolume
+        items: List<OperationFile>,
-    ): String? = coroutineScope {
+        srcVolumeId: Int = volumeId,
+    ): TaskResult<out String?> {
         val notification = showNotification(R.string.file_op_copy_msg, items.size)
-        val task = async {
+        val srcEncryptedVolume = getEncryptedVolume(srcVolumeId)
+        return volumeTask(volumeId, notification) { encryptedVolume ->
             var failedItem: String? = null
-            for (i in 0 until items.size) {
+            for (i in items.indices) {
-                withContext(Dispatchers.IO) {
+                yield()
-                    if (items[i].explorerElement.isDirectory) {
+                if (items[i].isDirectory) {
-                        if (!gocryptfsVolume.pathExists(items[i].dstPath!!)) {
+                    if (!encryptedVolume.pathExists(items[i].dstPath!!)) {
-                            if (!gocryptfsVolume.mkdir(items[i].dstPath!!)) {
+                        if (!encryptedVolume.mkdir(items[i].dstPath!!)) {
-                                failedItem = items[i].explorerElement.fullPath
+                            failedItem = items[i].srcPath
-                            }
-                        }
-                    } else {
-                        if (!copyFile(items[i].explorerElement.fullPath, items[i].dstPath!!, remoteGocryptfsVolume)) {
-                            failedItem = items[i].explorerElement.fullPath
                         }
                     }
+                } else if (!copyFile(encryptedVolume, items[i].srcPath, items[i].dstPath!!, srcEncryptedVolume)) {
+                    failedItem = items[i].srcPath
                 }
                 if (failedItem == null) {
                     updateNotificationProgress(notification, i+1, items.size)
@@ -179,27 +219,25 @@ class FileOperationService : Service() {
             }
             failedItem
         }
-        // treat cancellation as success
-        waitForTask(notification, task).failedItem
     }
 
-    suspend fun moveElements(toMove: List<OperationFile>, toClean: List<ExplorerElement>): String? = coroutineScope {
+    suspend fun moveElements(volumeId: Int, toMove: List<OperationFile>, toClean: List<String>): TaskResult<out String?> {
         val notification = showNotification(R.string.file_op_move_msg, toMove.size)
-        val task = async(Dispatchers.IO) {
+        return volumeTask(volumeId, notification) { encryptedVolume ->
             val total = toMove.size+toClean.size
             var failedItem: String? = null
             for ((i, item) in toMove.withIndex()) {
-                if (!gocryptfsVolume.rename(item.explorerElement.fullPath, item.dstPath!!)) {
+                if (!encryptedVolume.rename(item.srcPath, item.dstPath!!)) {
-                    failedItem = item.explorerElement.fullPath
+                    failedItem = item.srcPath
                     break
                 } else {
                     updateNotificationProgress(notification, i+1, total)
                 }
             }
             if (failedItem == null) {
-                for ((i, folder) in toClean.asReversed().withIndex()) {
+                for ((i, folderPath) in toClean.asReversed().withIndex()) {
-                    if (!gocryptfsVolume.rmdir(folder.fullPath)) {
+                    if (!encryptedVolume.rmdir(folderPath)) {
-                        failedItem = folder.fullPath
+                        failedItem = folderPath
                         break
                     } else {
                         updateNotificationProgress(notification, toMove.size+i+1, total)
@@ -208,25 +246,23 @@ class FileOperationService : Service() {
             }
             failedItem
         }
-        // treat cancellation as success
-        waitForTask(notification, task).failedItem
     }
 
     private suspend fun importFilesFromUris(
+        encryptedVolume: EncryptedVolume,
         dstPaths: List<String>,
         uris: List<Uri>,
         notification: FileOperationNotification,
     ): String? {
         var failedIndex = -1
         for (i in dstPaths.indices) {
-            withContext(Dispatchers.IO) {
+            yield()
-                try {
+            try {
-                    if (!gocryptfsVolume.importFile(this@FileOperationService, uris[i], dstPaths[i])) {
+                if (!encryptedVolume.importFile(this@FileOperationService, uris[i], dstPaths[i])) {
-                        failedIndex = i
-                    }
-                } catch (e: FileNotFoundException) {
                     failedIndex = i
                 }
+            } catch (e: FileNotFoundException) {
+                failedIndex = i
             }
             if (failedIndex == -1) {
                 updateNotificationProgress(notification, i+1, dstPaths.size)
@@ -237,12 +273,11 @@ class FileOperationService : Service() {
         return null
     }
 
-    suspend fun importFilesFromUris(dstPaths: List<String>, uris: List<Uri>): TaskResult<String?> = coroutineScope {
+    suspend fun importFilesFromUris(volumeId: Int, dstPaths: List<String>, uris: List<Uri>): TaskResult<out String?> {
         val notification = showNotification(R.string.file_op_import_msg, dstPaths.size)
-        val task = async {
+        return volumeTask(volumeId, notification) { encryptedVolume ->
-            importFilesFromUris(dstPaths, uris, notification)
+            importFilesFromUris(encryptedVolume, dstPaths, uris, notification)
         }
-        waitForTask(notification, task)
     }
 
     /**
@@ -252,77 +287,63 @@ class FileOperationService : Service() {
      *
      * @return false if cancelled early, true otherwise.
      */
-    private fun recursiveMapDirectoryForImport(
+    private suspend fun recursiveMapDirectoryForImport(
         rootSrcDir: DocumentFile,
         rootDstPath: String,
         dstFiles: ArrayList<String>,
         srcUris: ArrayList<Uri>,
         dstDirs: ArrayList<String>,
-        scope: CoroutineScope,
+    ) {
-    ): Boolean {
         dstDirs.add(rootDstPath)
         for (child in rootSrcDir.listFiles()) {
-            if (!scope.isActive) {
+            yield()
-                return false
-            }
             child.name?.let { name ->
                 val subPath = PathUtils.pathJoin(rootDstPath, name)
                 if (child.isDirectory) {
-                    if (!recursiveMapDirectoryForImport(child, subPath, dstFiles, srcUris, dstDirs, scope)) {
+                    recursiveMapDirectoryForImport(child, subPath, dstFiles, srcUris, dstDirs)
-                        return false
+                } else if (child.isFile) {
-                    }
-                }
-                else if (child.isFile) {
                     srcUris.add(child.uri)
                     dstFiles.add(subPath)
                 }
             }
         }
-        return true
     }
 
-    class ImportDirectoryResult(val taskResult: TaskResult<String?>, val uris: List<Uri>)
+    class ImportDirectoryResult(val taskResult: TaskResult<out String?>, val uris: List<Uri>)
 
     suspend fun importDirectory(
+        volumeId: Int,
         rootDstPath: String,
         rootSrcDir: DocumentFile,
-    ): ImportDirectoryResult = coroutineScope {
+    ): ImportDirectoryResult {
         val notification = showNotification(R.string.file_op_import_msg, null)
         val srcUris = arrayListOf<Uri>()
-        val task = async {
+        return ImportDirectoryResult(volumeTask(volumeId, notification) { encryptedVolume ->
             var failedItem: String? = null
             val dstFiles = arrayListOf<String>()
             val dstDirs = arrayListOf<String>()
-
+            recursiveMapDirectoryForImport(rootSrcDir, rootDstPath, dstFiles, srcUris, dstDirs)
-            withContext(Dispatchers.IO) {
+            // create destination folders so the new files can use them
-                if (!recursiveMapDirectoryForImport(rootSrcDir, rootDstPath, dstFiles, srcUris, dstDirs, this)) {
+            for (dir in dstDirs) {
-                    return@withContext
+                if (!encryptedVolume.mkdir(dir)) {
-                }
+                    failedItem = dir
-
+                    break
-                // create destination folders so the new files can use them
-                for (dir in dstDirs) {
-                    if (!gocryptfsVolume.mkdir(dir)) {
-                        failedItem = dir
-                        break
-                    }
                 }
             }
             if (failedItem == null) {
-                failedItem = importFilesFromUris(dstFiles, srcUris, notification)
+                failedItem = importFilesFromUris(encryptedVolume, dstFiles, srcUris, notification)
             }
             failedItem
-        }
+        }, srcUris)
-        ImportDirectoryResult(waitForTask(notification, task), srcUris)
     }
 
-    suspend fun wipeUris(uris: List<Uri>, rootFile: DocumentFile? = null): String? = coroutineScope {
+    suspend fun wipeUris(uris: List<Uri>, rootFile: DocumentFile? = null): TaskResult<out String?> {
         val notification = showNotification(R.string.file_op_wiping_msg, uris.size)
-        val task = async {
+        val task = serviceScope.async(Dispatchers.IO) {
             var errorMsg: String? = null
             for (i in uris.indices) {
-                withContext(Dispatchers.IO) {
+                yield()
-                    errorMsg = Wiper.wipe(this@FileOperationService, uris[i])
+                errorMsg = Wiper.wipe(this@FileOperationService, uris[i])
-                }
                 if (errorMsg == null) {
                     updateNotificationProgress(notification, i+1, uris.size)
                 } else {
@@ -334,40 +355,34 @@ class FileOperationService : Service() {
             }
             errorMsg
         }
-        // treat cancellation as success
+        return waitForTask(notification, task)
-        waitForTask(notification, task).failedItem
     }
 
-    private fun exportFileInto(srcPath: String, treeDocumentFile: DocumentFile): Boolean {
+    private fun exportFileInto(encryptedVolume: EncryptedVolume, srcPath: String, treeDocumentFile: DocumentFile): Boolean {
         val outputStream = treeDocumentFile.createFile("*/*", File(srcPath).name)?.uri?.let {
             contentResolver.openOutputStream(it)
         }
         return if (outputStream == null) {
             false
         } else {
-            gocryptfsVolume.exportFile(srcPath, outputStream)
+            encryptedVolume.exportFile(srcPath, outputStream)
         }
     }
 
-    private fun recursiveExportDirectory(
+    private suspend fun recursiveExportDirectory(
+        encryptedVolume: EncryptedVolume,
         plain_directory_path: String,
         treeDocumentFile: DocumentFile,
-        scope: CoroutineScope
     ): String? {
         treeDocumentFile.createDirectory(File(plain_directory_path).name)?.let { childTree ->
-            val explorerElements = gocryptfsVolume.listDir(plain_directory_path)
+            val explorerElements = encryptedVolume.readDir(plain_directory_path) ?: return null
             for (e in explorerElements) {
-                if (!scope.isActive) {
+                yield()
-                    return null
-                }
                 val fullPath = PathUtils.pathJoin(plain_directory_path, e.name)
                 if (e.isDirectory) {
-                    val failedItem = recursiveExportDirectory(fullPath, childTree, scope)
+                    recursiveExportDirectory(encryptedVolume, fullPath, childTree)?.let { return it }
-                    failedItem?.let { return it }
+                } else if (!exportFileInto(encryptedVolume, fullPath, childTree)) {
-                } else {
+                    return fullPath
-                    if (!exportFileInto(fullPath, childTree)){
-                        return fullPath
-                    }
                 }
             }
             return null
@@ -375,18 +390,20 @@ class FileOperationService : Service() {
         return treeDocumentFile.name
     }
 
-    suspend fun exportFiles(uri: Uri, items: List<ExplorerElement>): TaskResult<String?> = coroutineScope {
+    suspend fun exportFiles(volumeId: Int, items: List<ExplorerElement>, uri: Uri): TaskResult<out String?> {
         val notification = showNotification(R.string.file_op_export_msg, items.size)
-        val task = async {
+        return volumeTask(volumeId, notification) { encryptedVolume ->
-            contentResolver.takePersistableUriPermission(uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
             val treeDocumentFile = DocumentFile.fromTreeUri(this@FileOperationService, uri)!!
             var failedItem: String? = null
             for (i in items.indices) {
-                withContext(Dispatchers.IO) {
+                yield()
-                    failedItem = if (items[i].isDirectory) {
+                failedItem = if (items[i].isDirectory) {
-                        recursiveExportDirectory(items[i].fullPath, treeDocumentFile, this)
+                    recursiveExportDirectory(encryptedVolume, items[i].fullPath, treeDocumentFile)
+                } else {
+                    if (exportFileInto(encryptedVolume, items[i].fullPath, treeDocumentFile)) {
+                        null
                     } else {
-                        if (exportFileInto(items[i].fullPath, treeDocumentFile)) null else items[i].fullPath
+                        items[i].fullPath
                     }
                 }
                 if (failedItem == null) {
@@ -397,13 +414,50 @@ class FileOperationService : Service() {
             }
             failedItem
         }
-        waitForTask(notification, task)
     }
 
-    private fun recursiveCountChildElements(rootDirectory: DocumentFile, scope: CoroutineScope): Int {
+    private suspend fun recursiveRemoveDirectory(encryptedVolume: EncryptedVolume, path: String): String? {
-        if (!scope.isActive) {
+        encryptedVolume.readDir(path)?.let { elements ->
-            return 0
+            for (e in elements) {
+                yield()
+                val fullPath = PathUtils.pathJoin(path, e.name)
+                if (e.isDirectory) {
+                    recursiveRemoveDirectory(encryptedVolume, fullPath)?.let { return it }
+                } else if (!encryptedVolume.deleteFile(fullPath)) {
+                    return fullPath
+                }
+            }
         }
+        return if (!encryptedVolume.rmdir(path)) {
+            path
+        } else {
+            null
+        }
+    }
+
+    suspend fun removeElements(volumeId: Int, items: List<ExplorerElement>): String? {
+        val notification = showNotification(R.string.file_op_delete_msg, items.size)
+        return volumeTask(volumeId, notification) { encryptedVolume ->
+            var failedItem: String? = null
+            for ((i, element) in items.withIndex()) {
+                yield()
+                if (element.isDirectory) {
+                    recursiveRemoveDirectory(encryptedVolume, element.fullPath)?.let { failedItem = it }
+                } else if (!encryptedVolume.deleteFile(element.fullPath)) {
+                    failedItem = element.fullPath
+                }
+                if (failedItem == null) {
+                    updateNotificationProgress(notification, i + 1, items.size)
+                } else {
+                    break
+                }
+            }
+            failedItem
+        }.failedItem // treat cancellation as success
+    }
+
+    private suspend fun recursiveCountChildElements(rootDirectory: DocumentFile, scope: CoroutineScope): Int {
+        yield()
         val children = rootDirectory.listFiles()
         var count = children.size
         for (child in children) {
@@ -414,9 +468,7 @@ class FileOperationService : Service() {
         return count
     }
 
-    internal class ObjRef<T>(var value: T)
+    private suspend fun recursiveCopyVolume(
-
-    private fun recursiveCopyVolume(
         src: DocumentFile,
         dst: DocumentFile,
         dstRootDirectory: ObjRef<DocumentFile?>?,
@@ -428,9 +480,7 @@ class FileOperationService : Service() {
         val dstDir = dst.createDirectory(src.name ?: return src) ?: return src
         dstRootDirectory?.let { it.value = dstDir }
         for (child in src.listFiles()) {
-            if (!scope.isActive) {
+            yield()
-                return null
-            }
             if (child.isFile) {
                 val dstFile = dstDir.createFile("", child.name ?: return child) ?: return child
                 val outputStream = contentResolver.openOutputStream(dstFile.uri)
@@ -449,21 +499,16 @@ class FileOperationService : Service() {
         return null
     }
 
-    class CopyVolumeResult(val taskResult: TaskResult<DocumentFile?>, val dstRootDirectory: DocumentFile?)
+    class CopyVolumeResult(val taskResult: TaskResult<out DocumentFile?>, val dstRootDirectory: DocumentFile?)
 
-    suspend fun copyVolume(src: DocumentFile, dst: DocumentFile): CopyVolumeResult = coroutineScope {
+    suspend fun copyVolume(src: DocumentFile, dst: DocumentFile): CopyVolumeResult {
         val notification = showNotification(R.string.copy_volume_notification, null)
         val dstRootDirectory = ObjRef<DocumentFile?>(null)
-        val task = async(Dispatchers.IO) {
+        val task = serviceScope.async(Dispatchers.IO) {
             val total = recursiveCountChildElements(src, this)
-            if (isActive) {
+            updateNotificationProgress(notification, 0, total)
-                updateNotificationProgress(notification, 0, total)
+            recursiveCopyVolume(src, dst, dstRootDirectory, notification, total, this)
-                recursiveCopyVolume(src, dst, dstRootDirectory, notification, total, this)
-            } else {
-                null
-            }
         }
-        // treat cancellation as success
+        return CopyVolumeResult(waitForTask(notification, task), dstRootDirectory.value)
-        CopyVolumeResult(waitForTask(notification, task), dstRootDirectory.value)
     }
 }

app/src/main/java/sushi/hardcore/droidfs/file_operations/OperationFile.kt

@@ -1,11 +1,22 @@
 package sushi.hardcore.droidfs.file_operations
 
 import sushi.hardcore.droidfs.explorers.ExplorerElement
+import sushi.hardcore.droidfs.filesystems.Stat
+import sushi.hardcore.droidfs.util.PathUtils
+import java.io.File
+
+class OperationFile(val srcPath: String, val type: Int, var dstPath: String? = null, var overwriteConfirmed: Boolean = false) {
+    val isDirectory = type == Stat.S_IFDIR
+    val name: String by lazy {
+        File(srcPath).name
+    }
+    val parentPath by lazy {
+        PathUtils.getParentPath(srcPath)
+    }
 
-class OperationFile(val explorerElement: ExplorerElement, var dstPath: String? = null, var overwriteConfirmed: Boolean = false) {
     companion object {
         fun fromExplorerElement(e: ExplorerElement): OperationFile {
-            return OperationFile(e, null)
+            return OperationFile(e.fullPath, e.stat.type)
         }
     }
 }

app/src/main/java/sushi/hardcore/droidfs/file_operations/TaskResult.kt

@@ -0,0 +1,47 @@
+package sushi.hardcore.droidfs.file_operations
+
+import android.content.Context
+import sushi.hardcore.droidfs.R
+import sushi.hardcore.droidfs.Theme
+import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
+
+class TaskResult<T> private constructor(val state: State, val failedItem: T?, val errorMessage: String?) {
+    enum class State {
+        SUCCESS,
+        /**
+         * Task completed but failed
+         */
+        FAILED,
+        /**
+         * Task thrown an exception
+         */
+        ERROR,
+        CANCELLED,
+    }
+
+    fun showErrorAlertDialog(context: Context, theme: Theme) {
+        CustomAlertDialogBuilder(context, theme)
+            .setTitle(R.string.error)
+            .setMessage(context.getString(R.string.task_failed, errorMessage))
+            .setPositiveButton(R.string.ok, null)
+            .show()
+    }
+
+    companion object {
+        fun <T> completed(failedItem: T?): TaskResult<T> {
+            return if (failedItem == null) {
+                TaskResult(State.SUCCESS, null, null)
+            } else {
+                TaskResult(State.FAILED, failedItem, null)
+            }
+        }
+
+        fun <T> error(errorMessage: String?): TaskResult<T> {
+            return TaskResult(State.ERROR, null, errorMessage)
+        }
+
+        fun <T> cancelled(): TaskResult<T> {
+            return TaskResult(State.CANCELLED, null, null)
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/file_viewers/AudioPlayer.kt

@@ -1,8 +1,11 @@
 package sushi.hardcore.droidfs.file_viewers
 
-import com.google.android.exoplayer2.ExoPlayer
+import androidx.annotation.OptIn
+import androidx.media3.common.util.UnstableApi
+import androidx.media3.exoplayer.ExoPlayer
 import sushi.hardcore.droidfs.databinding.ActivityAudioPlayerBinding
 
+@OptIn(UnstableApi::class)
 class AudioPlayer: MediaPlayer(){
     private lateinit var binding: ActivityAudioPlayerBinding
 

app/src/main/java/sushi/hardcore/droidfs/file_viewers/EncryptedVolumeDataSource.kt

@@ -0,0 +1,69 @@
+package sushi.hardcore.droidfs.file_viewers
+
+import android.net.Uri
+import androidx.media3.common.C
+import androidx.annotation.OptIn
+import androidx.media3.common.util.UnstableApi
+import androidx.media3.datasource.DataSource
+import androidx.media3.datasource.DataSpec
+import androidx.media3.datasource.TransferListener
+import sushi.hardcore.droidfs.Constants
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import kotlin.math.min
+
+@OptIn(UnstableApi::class)
+class EncryptedVolumeDataSource(private val encryptedVolume: EncryptedVolume, private val filePath: String):
+    DataSource {
+    private var fileHandle = -1L
+    private var fileOffset: Long = 0
+    private var bytesRemaining: Long = -1
+
+    override fun open(dataSpec: DataSpec): Long {
+        fileHandle = encryptedVolume.openFileReadMode(filePath)
+        fileOffset = dataSpec.position
+        val fileSize = encryptedVolume.getAttr(filePath)!!.size
+        bytesRemaining = if (dataSpec.length == C.LENGTH_UNSET.toLong()) {
+            fileSize - fileOffset
+        } else {
+            min(fileSize, dataSpec.length)
+        }
+        return bytesRemaining
+    }
+
+    override fun getUri(): Uri {
+        return Constants.FAKE_URI
+    }
+
+    override fun close() {
+        encryptedVolume.closeFile(fileHandle)
+    }
+
+    override fun addTransferListener(transferListener: TransferListener) {
+        //too lazy to implement this
+    }
+
+    override fun read(buffer: ByteArray, offset: Int, readLength: Int): Int {
+        val originalOffset = fileOffset
+        while (fileOffset < originalOffset+readLength && encryptedVolume.read(
+                fileHandle,
+                fileOffset,
+                buffer,
+                offset+(fileOffset-originalOffset),
+                (originalOffset+readLength)-fileOffset
+            ).also { fileOffset += it } > 0
+        ) {}
+        val totalRead = fileOffset-originalOffset
+        bytesRemaining -= totalRead
+        return if (totalRead == 0L) {
+            C.RESULT_END_OF_INPUT
+        } else {
+            totalRead.toInt()
+        }
+    }
+
+    class Factory(private val encryptedVolume: EncryptedVolume, private val filePath: String): DataSource.Factory {
+        override fun createDataSource(): DataSource {
+            return EncryptedVolumeDataSource(encryptedVolume, filePath)
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/file_viewers/FileViewerActivity.kt

@@ -1,94 +1,139 @@
 package sushi.hardcore.droidfs.file_viewers
 
+import android.os.Build
 import android.os.Bundle
 import android.view.View
+import android.view.WindowInsets
+import android.widget.FrameLayout
+import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
 import androidx.core.view.WindowInsetsControllerCompat
+import androidx.core.view.updateLayoutParams
+import androidx.core.view.updateMargins
+import androidx.lifecycle.lifecycleScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.isActive
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 import sushi.hardcore.droidfs.BaseActivity
-import sushi.hardcore.droidfs.ConstValues
+import sushi.hardcore.droidfs.FileTypes
-import sushi.hardcore.droidfs.GocryptfsVolume
 import sushi.hardcore.droidfs.R
-import sushi.hardcore.droidfs.content_providers.RestrictedFileProvider
 import sushi.hardcore.droidfs.explorers.ExplorerElement
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.util.IntentUtils
 import sushi.hardcore.droidfs.util.PathUtils
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 
 abstract class FileViewerActivity: BaseActivity() {
-    protected lateinit var gocryptfsVolume: GocryptfsVolume
+    protected lateinit var encryptedVolume: EncryptedVolume
     protected lateinit var filePath: String
     private lateinit var originalParentPath: String
     private lateinit var windowInsetsController: WindowInsetsControllerCompat
     private var windowTypeMask = 0
-    private var isFinishingIntentionally = false
-    private var usf_keep_open = false
     private var foldersFirst = true
     private var wasMapped = false
     protected val mappedPlaylist = mutableListOf<ExplorerElement>()
     protected var currentPlaylistIndex = -1
-    private val legacyMod by lazy {
+    private val isLegacyFullscreen = Build.VERSION.SDK_INT <= Build.VERSION_CODES.R
-        sharedPrefs.getBoolean("legacyMod", false)
-    }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         filePath = intent.getStringExtra("path")!!
         originalParentPath = PathUtils.getParentPath(filePath)
-        val sessionID = intent.getIntExtra("sessionID", -1)
+        encryptedVolume = IntentUtils.getParcelableExtra(intent, "volume")!!
-        gocryptfsVolume = GocryptfsVolume(applicationContext, sessionID)
-        usf_keep_open = sharedPrefs.getBoolean("usf_keep_open", false)
         foldersFirst = sharedPrefs.getBoolean("folders_first", true)
         windowInsetsController = WindowInsetsControllerCompat(window, window.decorView)
         windowInsetsController.addOnControllableInsetsChangedListener { _, typeMask ->
             windowTypeMask = typeMask
         }
-        hideSystemUi()
+        windowInsetsController.systemBarsBehavior = WindowInsetsControllerCompat.BEHAVIOR_DEFAULT
         viewFile()
     }
 
+    open fun showPartialSystemUi() {
+        if (isLegacyFullscreen) {
+            @Suppress("Deprecation")
+            window.decorView.systemUiVisibility =
+                View.SYSTEM_UI_FLAG_FULLSCREEN or
+                View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+        } else {
+            windowInsetsController.hide(WindowInsetsCompat.Type.statusBars())
+            windowInsetsController.show(WindowInsetsCompat.Type.navigationBars())
+        }
+    }
+
     open fun hideSystemUi() {
-        if (legacyMod) {
+        if (isLegacyFullscreen) {
             @Suppress("Deprecation")
             window.decorView.systemUiVisibility =
                 View.SYSTEM_UI_FLAG_LOW_PROFILE or
-                View.SYSTEM_UI_FLAG_FULLSCREEN
+                View.SYSTEM_UI_FLAG_FULLSCREEN or
+                View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or
+                View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
         } else {
-            windowInsetsController.hide(WindowInsetsCompat.Type.statusBars())
+            windowInsetsController.hide(WindowInsetsCompat.Type.systemBars())
+
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+                window.setDecorFitsSystemWindows(false)
+            }
+        }
+    }
+
+    protected fun applyNavigationBarMargin(root: View) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+            ViewCompat.setOnApplyWindowInsetsListener(root) { _, insets ->
+                root.updateLayoutParams<FrameLayout.LayoutParams> {
+                    val newInsets = insets.getInsetsIgnoringVisibility(WindowInsets.Type.navigationBars())
+                    this.updateMargins(
+                        left = newInsets.left,
+                        top = newInsets.top,
+                        right = newInsets.right,
+                        bottom = newInsets.bottom
+                    )
+                }
+                insets
+            }
+        } else {
+            root.fitsSystemWindows = true
         }
     }
 
     abstract fun getFileType(): String
     abstract fun viewFile()
 
-    override fun onUserInteraction() {
+    protected fun loadWholeFile(path: String, fileSize: Long? = null, callback: (ByteArray) -> Unit) {
-        super.onUserInteraction()
+        lifecycleScope.launch(Dispatchers.IO) {
-        if (windowTypeMask and WindowInsetsCompat.Type.statusBars() == 0) {
+            val result = encryptedVolume.loadWholeFile(path, size = fileSize)
-            hideSystemUi()
+            if (isActive) {
-        }
+                withContext(Dispatchers.Main) {
-    }
+                    if (result.second == 0) {
-
+                        callback(result.first!!)
-    protected fun loadWholeFile(path: String, fileSize: Long? = null): ByteArray? {
+                    } else {
-        val result = gocryptfsVolume.loadWholeFile(path, size = fileSize)
+                        val dialog = CustomAlertDialogBuilder(this@FileViewerActivity, theme)
-        if (result.second != 0) {
+                            .setTitle(R.string.error)
-            val dialog = CustomAlertDialogBuilder(this, themeValue)
+                            .setCancelable(false)
-                .setTitle(R.string.error)
+                            .setPositiveButton(R.string.ok) { _, _ -> goBackToExplorer() }
-                .setCancelable(false)
+                        when (result.second) {
-                .setPositiveButton(R.string.ok) { _, _ -> goBackToExplorer() }
+                            1 -> dialog.setMessage(R.string.get_size_failed)
-            when (result.second) {
+                            2 -> dialog.setMessage(R.string.outofmemoryerror_msg)
-                1 -> dialog.setMessage(R.string.get_size_failed)
+                            3 -> dialog.setMessage(R.string.read_file_failed)
-                2 -> dialog.setMessage(R.string.outofmemoryerror_msg)
+                            4 -> dialog.setMessage(R.string.io_error)
-                else -> dialog.setMessage(R.string.read_file_failed)
+                        }
+                        dialog.show()
+                    }
+                }
             }
-            dialog.show()
         }
-        return result.first
     }
 
     protected fun createPlaylist() {
         if (!wasMapped){
-            for (e in gocryptfsVolume.recursiveMapFiles(originalParentPath)) {
+            encryptedVolume.recursiveMapFiles(originalParentPath)?.let { elements ->
-                if (e.isRegularFile) {
+                for (e in elements) {
-                    if (ConstValues.isExtensionType(getFileType(), e.name) || filePath == e.fullPath) {
+                    if (e.isRegularFile) {
-                        mappedPlaylist.add(e)
+                        if (FileTypes.isExtensionType(getFileType(), e.name) || filePath == e.fullPath) {
+                            mappedPlaylist.add(e)
+                        }
                     }
                 }
             }
@@ -126,27 +171,13 @@ abstract class FileViewerActivity: BaseActivity() {
     }
 
     protected fun goBackToExplorer() {
-        isFinishingIntentionally = true
         finish()
     }
 
-    override fun onDestroy() {
+    override fun onResume() {
-        super.onDestroy()
+        super.onResume()
-        if (!isFinishingIntentionally) {
+        if (encryptedVolume.isClosed()) {
-            gocryptfsVolume.close()
-            RestrictedFileProvider.wipeAll(this)
-        }
-    }
-
-    override fun onPause() {
-        super.onPause()
-        if (!usf_keep_open) {
             finish()
         }
     }
-
-    override fun onBackPressed() {
-        super.onBackPressed()
-        isFinishingIntentionally = true
-    }
 }

app/src/main/java/sushi/hardcore/droidfs/file_viewers/GocryptfsDataSource.kt

@@ -1,60 +0,0 @@
-package sushi.hardcore.droidfs.file_viewers
-
-import android.net.Uri
-import com.google.android.exoplayer2.upstream.DataSource
-import com.google.android.exoplayer2.upstream.DataSpec
-import com.google.android.exoplayer2.upstream.TransferListener
-import sushi.hardcore.droidfs.ConstValues
-import sushi.hardcore.droidfs.GocryptfsVolume
-import kotlin.math.ceil
-import kotlin.math.min
-
-class GocryptfsDataSource(private val gocryptfsVolume: GocryptfsVolume, private val filePath: String): DataSource {
-    private var handleID = -1
-    private var fileSize: Long = -1
-    private var fileOffset: Long = 0
-    override fun open(dataSpec: DataSpec): Long {
-        fileOffset = dataSpec.position
-        handleID = gocryptfsVolume.openReadMode(filePath)
-        fileSize = gocryptfsVolume.getSize(filePath)
-        return fileSize
-    }
-
-    override fun getUri(): Uri {
-        return ConstValues.FAKE_URI
-    }
-
-    override fun close() {
-        gocryptfsVolume.closeFile(handleID)
-    }
-
-    override fun addTransferListener(transferListener: TransferListener) {
-        //too lazy to implement this
-    }
-
-    override fun read(buffer: ByteArray, offset: Int, readLength: Int): Int {
-        if (fileOffset >= fileSize){
-            return -1
-        }
-        var totalRead = 0
-        for (i in 0 until ceil(readLength.toDouble()/ConstValues.MAX_KERNEL_WRITE).toInt()){
-            val tmpReadLength = min(readLength-totalRead, ConstValues.MAX_KERNEL_WRITE)
-            val tmpBuff = if (fileOffset+tmpReadLength > fileSize){
-                ByteArray((fileSize-fileOffset).toInt())
-            } else {
-                ByteArray(tmpReadLength)
-            }
-            val read = gocryptfsVolume.readFile(handleID, fileOffset, tmpBuff)
-            System.arraycopy(tmpBuff, 0, buffer, offset+totalRead, read)
-            fileOffset += read
-            totalRead += read
-        }
-        return totalRead
-    }
-
-    class Factory(private val gocryptfsVolume: GocryptfsVolume, private val filePath: String): DataSource.Factory {
-        override fun createDataSource(): DataSource {
-            return GocryptfsDataSource(gocryptfsVolume, filePath)
-        }
-    }
-}

app/src/main/java/sushi/hardcore/droidfs/file_viewers/ImageViewer.kt

@@ -1,9 +1,7 @@
 package sushi.hardcore.droidfs.file_viewers
 
 import android.content.res.Configuration
-import android.content.res.Resources
 import android.graphics.Bitmap
-import android.graphics.BitmapFactory
 import android.graphics.Matrix
 import android.graphics.drawable.Drawable
 import android.os.Handler
@@ -11,12 +9,14 @@ import android.view.MotionEvent
 import android.view.View
 import android.view.WindowManager
 import android.widget.Toast
-import androidx.exifinterface.media.ExifInterface
+import androidx.activity.addCallback
+import androidx.activity.viewModels
+import androidx.lifecycle.ViewModel
 import com.bumptech.glide.Glide
 import com.bumptech.glide.RequestBuilder
 import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool
 import com.bumptech.glide.load.resource.bitmap.BitmapTransformation
-import sushi.hardcore.droidfs.ConstValues
+import sushi.hardcore.droidfs.Constants
 import sushi.hardcore.droidfs.R
 import sushi.hardcore.droidfs.databinding.ActivityImageViewerBinding
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
@@ -33,19 +33,23 @@ class ImageViewer: FileViewerActivity() {
         private const val MIN_SWIPE_DISTANCE = 150
     }
 
+    class ImageViewModel : ViewModel() {
+        var imageBytes: ByteArray? = null
+        var rotationAngle: Float = 0f
+    }
+
     private lateinit var fileName: String
     private lateinit var handler: Handler
-    private var bitmap: Bitmap? = null
+    private val imageViewModel: ImageViewModel by viewModels()
     private var requestBuilder: RequestBuilder<Drawable>? = null
     private var x1 = 0F
     private var x2 = 0F
     private var slideshowActive = false
-    private var originalOrientation: Float = 0f
-    private var rotationAngle: Float = 0F
     private var orientationTransformation: OrientationTransformation? = null
     private val hideUI = Runnable {
         binding.actionButtons.visibility = View.GONE
         binding.topBar.visibility = View.GONE
+        hideSystemUi()
     }
     private val slideshowNext = Runnable {
         if (slideshowActive){
@@ -63,6 +67,8 @@ class ImageViewer: FileViewerActivity() {
         binding = ActivityImageViewerBinding.inflate(layoutInflater)
         setContentView(binding.root)
         supportActionBar?.hide()
+        showPartialSystemUi()
+        applyNavigationBarMargin(binding.root)
         handler = Handler(mainLooper)
         binding.imageViewer.setOnInteractionListener(object : ZoomableImageView.OnInteractionListener {
             override fun onSingleTap(event: MotionEvent?) {
@@ -70,6 +76,7 @@ class ImageViewer: FileViewerActivity() {
                 if (binding.actionButtons.visibility == View.GONE) {
                     binding.actionButtons.visibility = View.VISIBLE
                     binding.topBar.visibility = View.VISIBLE
+                    showPartialSystemUi()
                     handler.postDelayed(hideUI, hideDelay)
                 } else {
                     hideUI.run()
@@ -94,21 +101,21 @@ class ImageViewer: FileViewerActivity() {
             }
         })
         binding.imageDelete.setOnClickListener {
-            CustomAlertDialogBuilder(this, themeValue)
+            CustomAlertDialogBuilder(this, theme)
                 .keepFullScreen()
                 .setTitle(R.string.warning)
                 .setPositiveButton(R.string.ok) { _, _ ->
                     createPlaylist() //be sure the playlist is created before deleting if there is only one image
-                    if (gocryptfsVolume.removeFile(filePath)) {
+                    if (encryptedVolume.deleteFile(filePath)) {
                         playlistNext(true)
                         refreshPlaylist()
                         if (mappedPlaylist.size == 0) { //deleted all images of the playlist
                             goBackToExplorer()
                         } else {
-                            loadImage()
+                            loadImage(true)
                         }
                     } else {
-                        CustomAlertDialogBuilder(this, themeValue)
+                        CustomAlertDialogBuilder(this, theme)
                             .keepFullScreen()
                             .setTitle(R.string.error)
                             .setMessage(getString(R.string.remove_failed, fileName))
@@ -123,7 +130,7 @@ class ImageViewer: FileViewerActivity() {
         binding.imageButtonSlideshow.setOnClickListener {
             if (!slideshowActive){
                 slideshowActive = true
-                handler.postDelayed(slideshowNext, ConstValues.SLIDESHOW_DELAY)
+                handler.postDelayed(slideshowNext, Constants.SLIDESHOW_DELAY)
                 window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
                 hideUI.run()
                 Toast.makeText(this, R.string.slideshow_started, Toast.LENGTH_SHORT).show()
@@ -143,64 +150,39 @@ class ImageViewer: FileViewerActivity() {
                 swipeImage(-1F)
             }
         }
-        binding.imageRotateRight.setOnClickListener {
+        binding.imageRotateRight.setOnClickListener { onClickRotate(90f) }
-            rotationAngle += 90
+        binding.imageRotateLeft.setOnClickListener { onClickRotate(-90f) }
-            rotateImage()
+        onBackPressedDispatcher.addCallback(this) {
+            if (slideshowActive) {
+                stopSlideshow()
+            } else {
+                askSaveRotation {
+                    isEnabled = false
+                    onBackPressedDispatcher.onBackPressed()
+                }
+            }
         }
-        binding.imageRotateLeft.setOnClickListener {
+        loadImage(false)
-            rotationAngle -= 90
-            rotateImage()
-        }
-        loadImage()
         handler.postDelayed(hideUI, hideDelay)
     }
 
-    private fun loadImage(){
+    private fun loadImage(newImage: Boolean) {
-        bitmap = null
+        fileName = File(filePath).name
-        requestBuilder = null
+        binding.textFilename.text = fileName
-        loadWholeFile(filePath)?.let {
+        if (newImage || imageViewModel.imageBytes == null) {
-            val displayWithGlide = if (it.size < 5_000_000) {
+            loadWholeFile(filePath) {
-                true
+                imageViewModel.imageBytes = it
-            } else {
-                bitmap = BitmapFactory.decodeByteArray(it, 0, it.size)
-                if (bitmap == null) {
-                    true
-                } else {
-                    val orientation = ExifInterface(ByteArrayInputStream(it)).getAttributeInt(
-                        ExifInterface.TAG_ORIENTATION,
-                        ExifInterface.ORIENTATION_NORMAL
-                    )
-                    originalOrientation = when (orientation) {
-                        ExifInterface.ORIENTATION_ROTATE_90 -> 90f
-                        ExifInterface.ORIENTATION_ROTATE_180 -> 180f
-                        ExifInterface.ORIENTATION_ROTATE_270 -> 270f
-                        else -> 0f
-                    }
-                    val displayMetrics = Resources.getSystem().displayMetrics
-                    if (displayMetrics.widthPixels < bitmap!!.width || displayMetrics.heightPixels < bitmap!!.height) {
-                        val newWidth: Int
-                        val newHeight: Int
-                        if (displayMetrics.widthPixels > displayMetrics.heightPixels) {
-                            newWidth = displayMetrics.widthPixels
-                            newHeight = bitmap!!.height*displayMetrics.widthPixels/bitmap!!.width
-                        } else {
-                            newHeight = displayMetrics.heightPixels
-                            newWidth = bitmap!!.width*displayMetrics.heightPixels/bitmap!!.height
-                        }
-                        bitmap = Bitmap.createScaledBitmap(bitmap!!, newWidth, newHeight, false)
-                    }
-                    Glide.with(this).load(bitmap).transform(OrientationTransformation(originalOrientation)).into(binding.imageViewer)
-                    false
-                }
-            }
-            if (displayWithGlide) {
-                originalOrientation = 0f
                 requestBuilder = Glide.with(this).load(it)
                 requestBuilder?.into(binding.imageViewer)
+                imageViewModel.rotationAngle = 0f
+            }
+        } else {
+            requestBuilder = Glide.with(this).load(imageViewModel.imageBytes)
+            if (imageViewModel.rotationAngle.mod(360f) != 0f) {
+                rotateImage()
+            } else {
+                requestBuilder?.into(binding.imageViewer)
             }
-            fileName = File(filePath).name
-            binding.textFilename.text = fileName
-            rotationAngle = originalOrientation
         }
     }
 
@@ -210,14 +192,20 @@ class ImageViewer: FileViewerActivity() {
         handler.postDelayed(hideUI, hideDelay)
     }
 
+    private fun onClickRotate(angle: Float) {
+        imageViewModel.rotationAngle += angle
+        binding.imageViewer.restoreZoomNormal()
+        rotateImage()
+    }
+
     private fun swipeImage(deltaX: Float, slideshowSwipe: Boolean = false){
         playlistNext(deltaX < 0)
-        loadImage()
+        loadImage(true)
-        if (slideshowActive){
+        if (slideshowActive) {
             if (!slideshowSwipe) { //reset slideshow delay if user swipes
                 handler.removeCallbacks(slideshowNext)
             }
-            handler.postDelayed(slideshowNext, ConstValues.SLIDESHOW_DELAY)
+            handler.postDelayed(slideshowNext, Constants.SLIDESHOW_DELAY)
         }
     }
 
@@ -227,14 +215,6 @@ class ImageViewer: FileViewerActivity() {
         Toast.makeText(this, R.string.slideshow_stopped, Toast.LENGTH_SHORT).show()
     }
 
-    override fun onBackPressed() {
-        if (slideshowActive){
-            stopSlideshow()
-        } else {
-            askSaveRotation { super.onBackPressed() }
-        }
-    }
-
     class OrientationTransformation(private val orientation: Float): BitmapTransformation() {
 
         lateinit var bitmap: Bitmap
@@ -252,15 +232,14 @@ class ImageViewer: FileViewerActivity() {
         }
     }
 
-    private fun rotateImage(){
+    private fun rotateImage() {
-        binding.imageViewer.restoreZoomNormal()
+        orientationTransformation = OrientationTransformation(imageViewModel.rotationAngle)
-        orientationTransformation = OrientationTransformation(rotationAngle)
+        requestBuilder?.transform(orientationTransformation)?.into(binding.imageViewer)
-        (requestBuilder ?: Glide.with(this).load(bitmap)).transform(orientationTransformation).into(binding.imageViewer)
     }
 
     private fun askSaveRotation(callback: () -> Unit){
-        if (rotationAngle.mod(360f) != originalOrientation && !slideshowActive) {
+        if (imageViewModel.rotationAngle.mod(360f) != 0f && !slideshowActive) {
-            CustomAlertDialogBuilder(this, themeValue)
+            CustomAlertDialogBuilder(this, theme)
                 .keepFullScreen()
                 .setTitle(R.string.warning)
                 .setMessage(R.string.ask_save_img_rotated)
@@ -273,13 +252,13 @@ class ImageViewer: FileViewerActivity() {
                                     Bitmap.CompressFormat.PNG
                                 } else {
                                     Bitmap.CompressFormat.JPEG
-                                }, 100, outputStream) == true
+                                }, 90, outputStream) == true
                         ){
-                            if (gocryptfsVolume.importFile(ByteArrayInputStream(outputStream.toByteArray()), filePath)){
+                            if (encryptedVolume.importFile(ByteArrayInputStream(outputStream.toByteArray()), filePath)) {
                                 Toast.makeText(this, R.string.image_saved_successfully, Toast.LENGTH_SHORT).show()
                                 callback()
                             } else {
-                                CustomAlertDialogBuilder(this, themeValue)
+                                CustomAlertDialogBuilder(this, theme)
                                     .keepFullScreen()
                                     .setTitle(R.string.error)
                                     .setMessage(R.string.file_write_failed)
@@ -287,7 +266,7 @@ class ImageViewer: FileViewerActivity() {
                                     .show()
                             }
                         } else {
-                            CustomAlertDialogBuilder(this, themeValue)
+                            CustomAlertDialogBuilder(this, theme)
                                 .keepFullScreen()
                                 .setTitle(R.string.error)
                                 .setMessage(R.string.bitmap_compress_failed)

app/src/main/java/sushi/hardcore/droidfs/file_viewers/MediaPlayer.kt

@@ -1,16 +1,22 @@
 package sushi.hardcore.droidfs.file_viewers
 
 import android.view.WindowManager
-import com.google.android.exoplayer2.*
+import androidx.annotation.OptIn
-import com.google.android.exoplayer2.extractor.DefaultExtractorsFactory
+import androidx.media3.common.MediaItem
-import com.google.android.exoplayer2.source.MediaSource
+import androidx.media3.common.PlaybackException
-import com.google.android.exoplayer2.source.ProgressiveMediaSource
+import androidx.media3.common.Player
-import com.google.android.exoplayer2.video.VideoSize
+import androidx.media3.common.VideoSize
-import sushi.hardcore.droidfs.ConstValues
+import androidx.media3.common.util.UnstableApi
+import androidx.media3.exoplayer.ExoPlayer
+import androidx.media3.exoplayer.source.MediaSource
+import androidx.media3.exoplayer.source.ProgressiveMediaSource
+import androidx.media3.extractor.DefaultExtractorsFactory
+import sushi.hardcore.droidfs.Constants
 import sushi.hardcore.droidfs.R
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import java.io.File
 
+@OptIn(UnstableApi::class)
 abstract class MediaPlayer: FileViewerActivity() {
     private lateinit var player: ExoPlayer
 
@@ -25,9 +31,9 @@ abstract class MediaPlayer: FileViewerActivity() {
     protected open fun onVideoSizeChanged(width: Int, height: Int) {}
 
     private fun createMediaSource(filePath: String): MediaSource {
-        val dataSourceFactory = GocryptfsDataSource.Factory(gocryptfsVolume, filePath)
+        val dataSourceFactory = EncryptedVolumeDataSource.Factory(encryptedVolume, filePath)
         return ProgressiveMediaSource.Factory(dataSourceFactory, DefaultExtractorsFactory())
-            .createMediaSource(MediaItem.fromUri(ConstValues.FAKE_URI))
+            .createMediaSource(MediaItem.fromUri(Constants.FAKE_URI))
     }
 
     private fun initializePlayer(){
@@ -45,7 +51,7 @@ abstract class MediaPlayer: FileViewerActivity() {
                 onVideoSizeChanged(videoSize.width, videoSize.height)
             }
             override fun onPlayerError(error: PlaybackException) {
-                CustomAlertDialogBuilder(this@MediaPlayer, themeValue)
+                CustomAlertDialogBuilder(this@MediaPlayer, theme)
                         .setTitle(R.string.error)
                         .setMessage(getString(R.string.playing_failed, error.errorCodeName))
                         .setCancelable(false)
@@ -59,9 +65,10 @@ abstract class MediaPlayer: FileViewerActivity() {
                     window.clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
                 }
             }
-            override fun onPositionDiscontinuity(reason: Int) {
+
-                if (player.currentMediaItemIndex != currentPlaylistIndex) {
+            override fun onMediaItemTransition(mediaItem: MediaItem?, reason: Int) {
-                    playlistNext(player.currentMediaItemIndex == (currentPlaylistIndex+1) % mappedPlaylist.size)
+                if (player.repeatMode != Player.REPEAT_MODE_ONE) {
+                    playlistNext(player.currentMediaItemIndex == (currentPlaylistIndex + 1) % mappedPlaylist.size)
                     refreshFileName()
                 }
             }

app/src/main/java/sushi/hardcore/droidfs/file_viewers/PdfViewer.kt

@@ -7,11 +7,10 @@ import java.io.ByteArrayInputStream
 import java.io.File
 
 class PdfViewer: FileViewerActivity() {
-    private lateinit var pdfViewer: PdfViewer
+    init {
-
+        applyCustomTheme = false
-    override fun hideSystemUi() {
-        //don't hide system ui
     }
+    private lateinit var pdfViewer: PdfViewer
 
     override fun getFileType(): String {
         return "pdf"
@@ -21,13 +20,13 @@ class PdfViewer: FileViewerActivity() {
         pdfViewer = PdfViewer(this)
         val fileName = File(filePath).name
         title = fileName
-        val fileSize = gocryptfsVolume.getSize(filePath)
+        val fileSize = encryptedVolume.getAttr(filePath)?.size
-        loadWholeFile(filePath, fileSize)?.let {
+        loadWholeFile(filePath, fileSize) {
             pdfViewer.loadPdf(ByteArrayInputStream(it), fileName, fileSize)
         }
     }
 
-    override fun onCreateOptionsMenu(menu: Menu?): Boolean {
+    override fun onCreateOptionsMenu(menu: Menu): Boolean {
         pdfViewer.onCreateOptionMenu(menu)
         return super.onCreateOptionsMenu(menu)
     }
@@ -37,7 +36,12 @@ class PdfViewer: FileViewerActivity() {
         pdfViewer.onResume()
     }
 
-    override fun onPrepareOptionsMenu(menu: Menu?): Boolean {
+    override fun onDestroy() {
+        super.onDestroy()
+        pdfViewer.onDestroy()
+    }
+
+    override fun onPrepareOptionsMenu(menu: Menu): Boolean {
         return pdfViewer.onPrepareOptionsMenu(menu)
     }
 

app/src/main/java/sushi/hardcore/droidfs/file_viewers/TextEditor.kt

@@ -7,10 +7,9 @@ import android.view.Menu
 import android.view.MenuItem
 import android.widget.EditText
 import android.widget.Toast
-import sushi.hardcore.droidfs.GocryptfsVolume
+import androidx.activity.addCallback
 import sushi.hardcore.droidfs.R
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
-import java.io.ByteArrayInputStream
 import java.io.File
 
 class TextEditor: FileViewerActivity() {
@@ -18,21 +17,23 @@ class TextEditor: FileViewerActivity() {
     private lateinit var editor: EditText
     private var changedSinceLastSave = false
     private var wordWrap = true
-    override fun hideSystemUi() {
-        //don't hide system ui
-    }
 
     override fun getFileType(): String {
         return "text"
     }
 
     override fun viewFile() {
-        loadWholeFile(filePath)?.let {
+        fileName = File(filePath).name
-            fileName = File(filePath).name
+        title = fileName
+        supportActionBar?.setDisplayHomeAsUpEnabled(true)
+        loadWholeFile(filePath) {
             try {
                 loadLayout(String(it))
+                onBackPressedDispatcher.addCallback(this) {
+                    checkSaveAndExit()
+                }
             } catch (e: OutOfMemoryError){
-                CustomAlertDialogBuilder(this, themeValue)
+                CustomAlertDialogBuilder(this, theme)
                     .setTitle(R.string.error)
                     .setMessage(R.string.outofmemoryerror_msg)
                     .setCancelable(false)
@@ -47,8 +48,6 @@ class TextEditor: FileViewerActivity() {
         } else {
             setContentView(R.layout.activity_text_editor)
         }
-        title = fileName
-        supportActionBar?.setDisplayHomeAsUpEnabled(true)
         editor = findViewById(R.id.text_editor)
         editor.setText(fileContent)
         editor.addTextChangedListener(object: TextWatcher {
@@ -68,25 +67,14 @@ class TextEditor: FileViewerActivity() {
     private fun save(): Boolean{
         var success = false
         val content = editor.text.toString().toByteArray()
-        val handleID = gocryptfsVolume.openWriteMode(filePath)
+        val fileHandle = encryptedVolume.openFileWriteMode(filePath)
-        if (handleID != -1){
+        if (fileHandle != -1L) {
-            val buff = ByteArrayInputStream(content)
             var offset: Long = 0
-            val ioBuffer = ByteArray(GocryptfsVolume.DefaultBS)
+            while (offset < content.size && encryptedVolume.write(fileHandle, offset, content, offset, content.size.toLong()).also { offset += it } > 0) {}
-            var length: Int
-            while (buff.read(ioBuffer).also { length = it } > 0) {
-                val written = gocryptfsVolume.writeFile(handleID, offset, ioBuffer, length).toLong()
-                if (written == length.toLong()) {
-                    offset += written
-                } else {
-                    break
-                }
-            }
             if (offset == content.size.toLong()){
-                success = gocryptfsVolume.truncate(handleID, offset)
+                success = encryptedVolume.truncate(filePath, offset)
             }
-            gocryptfsVolume.closeFile(handleID)
+            encryptedVolume.closeFile(fileHandle)
-            buff.close()
         }
         if (success){
             Toast.makeText(this, getString(R.string.file_saved), Toast.LENGTH_SHORT).show()
@@ -98,7 +86,7 @@ class TextEditor: FileViewerActivity() {
 
     private fun checkSaveAndExit(){
         if (changedSinceLastSave){
-            CustomAlertDialogBuilder(this, themeValue)
+            CustomAlertDialogBuilder(this, theme)
                 .setTitle(R.string.warning)
                 .setMessage(R.string.ask_save)
                 .setPositiveButton(R.string.save) { _, _ ->
@@ -139,8 +127,4 @@ class TextEditor: FileViewerActivity() {
         }
         return true
     }
-
-    override fun onBackPressed() {
-        checkSaveAndExit()
-    }
 }

app/src/main/java/sushi/hardcore/droidfs/file_viewers/VideoPlayer.kt

@@ -1,7 +1,10 @@
 package sushi.hardcore.droidfs.file_viewers
 
 import android.content.pm.ActivityInfo
-import com.google.android.exoplayer2.ExoPlayer
+import android.content.res.Configuration
+import android.view.View
+import androidx.media3.exoplayer.ExoPlayer
+import androidx.media3.ui.PlayerView
 import sushi.hardcore.droidfs.databinding.ActivityVideoPlayerBinding
 
 class VideoPlayer: MediaPlayer() {
@@ -14,23 +17,29 @@ class VideoPlayer: MediaPlayer() {
     override fun viewFile() {
         binding = ActivityVideoPlayerBinding.inflate(layoutInflater)
         setContentView(binding.root)
+        applyNavigationBarMargin(binding.root)
+        binding.videoPlayer.doubleTapOverlay = binding.doubleTapOverlay
+        binding.videoPlayer.setControllerVisibilityListener(PlayerView.ControllerVisibilityListener { visibility ->
+            binding.topBar.visibility = visibility
+            if (visibility == View.VISIBLE) {
+                showPartialSystemUi()
+            } else {
+                hideSystemUi()
+            }
+        })
+        binding.rotateButton.setOnClickListener {
+            requestedOrientation =
+                if (resources.configuration.orientation == Configuration.ORIENTATION_LANDSCAPE) {
+                    ActivityInfo.SCREEN_ORIENTATION_USER_PORTRAIT
+                } else {
+                    ActivityInfo.SCREEN_ORIENTATION_USER_LANDSCAPE
+                }
+        }
         super.viewFile()
     }
 
     override fun bindPlayer(player: ExoPlayer) {
         binding.videoPlayer.player = player
-        binding.videoPlayer.doubleTapOverlay = binding.doubleTapOverlay
-        binding.videoPlayer.setControllerVisibilityListener { visibility ->
-            binding.topBar.visibility = visibility
-        }
-        binding.rotateButton.setOnClickListener {
-            requestedOrientation =
-                if (requestedOrientation == ActivityInfo.SCREEN_ORIENTATION_USER_LANDSCAPE)
-                    ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
-                else
-                    ActivityInfo.SCREEN_ORIENTATION_USER_LANDSCAPE
-        }
-
     }
 
     override fun onNewFileName(fileName: String) {

app/src/main/java/sushi/hardcore/droidfs/filesystems/CryfsVolume.kt

@@ -0,0 +1,171 @@
+package sushi.hardcore.droidfs.filesystems
+
+import android.os.Parcel
+import sushi.hardcore.droidfs.Constants
+import sushi.hardcore.droidfs.R
+import sushi.hardcore.droidfs.explorers.ExplorerElement
+import sushi.hardcore.droidfs.util.ObjRef
+import sushi.hardcore.droidfs.util.PathUtils
+
+class CryfsVolume(private val fusePtr: Long): EncryptedVolume() {
+    companion object {
+        init {
+            System.loadLibrary("cryfs_jni")
+        }
+
+        const val CONFIG_FILE_NAME = "cryfs.config"
+
+        private external fun nativeInit(
+            baseDir: String,
+            localStateDir: String,
+            password: ByteArray?,
+            givenHash: ByteArray?,
+            returnedHash: ObjRef<ByteArray?>?,
+            createBaseDir: Boolean,
+            cipher: String?,
+            errorCode: ObjRef<Int?>,
+        ): Long
+        private external fun nativeChangeEncryptionKey(
+            baseDir: String,
+            localStateDir: String,
+            currentPassword: ByteArray?,
+            givenHash: ByteArray?,
+            newPassword: ByteArray,
+            returnedHash: ObjRef<ByteArray?>?
+        ): Boolean
+        private external fun nativeCreate(fusePtr: Long, path: String, mode: Int): Long
+        private external fun nativeOpen(fusePtr: Long, path: String, flags: Int): Long
+        private external fun nativeRead(fusePtr: Long, fileHandle: Long, fileOffset: Long, buffer: ByteArray, dstOffset: Long, length: Long): Int
+        private external fun nativeWrite(fusePtr: Long, fileHandle: Long, fileOffset: Long, buffer: ByteArray, srcOffset: Long, length: Long): Int
+        private external fun nativeTruncate(fusePtr: Long, path: String, size: Long): Boolean
+        private external fun nativeDeleteFile(fusePtr: Long, path: String): Boolean
+        private external fun nativeCloseFile(fusePtr: Long, fileHandle: Long): Boolean
+        private external fun nativeReadDir(fusePtr: Long, path: String): MutableList<ExplorerElement>?
+        private external fun nativeMkdir(fusePtr: Long, path: String, mode: Int): Boolean
+        private external fun nativeRmdir(fusePtr: Long, path: String): Boolean
+        private external fun nativeGetAttr(fusePtr: Long, path: String): Stat?
+        private external fun nativeRename(fusePtr: Long, srcPath: String, dstPath: String): Boolean
+        private external fun nativeClose(fusePtr: Long)
+        private external fun nativeIsClosed(fusePtr: Long): Boolean
+
+        fun getLocalStateDir(filesDir: String): String {
+            return PathUtils.pathJoin(filesDir, Constants.CRYFS_LOCAL_STATE_DIR)
+        }
+
+        private fun init(
+            baseDir: String,
+            localStateDir: String,
+            password: ByteArray?,
+            givenHash: ByteArray?,
+            returnedHash: ObjRef<ByteArray?>?,
+            createBaseDir: Boolean,
+            cipher: String?
+        ): InitResult {
+            val errorCode = ObjRef<Int?>(null)
+            val fusePtr = nativeInit(baseDir, localStateDir, password, givenHash, returnedHash, createBaseDir, cipher, errorCode)
+            val result = InitResult.Builder()
+            if (fusePtr == 0L) {
+                result.errorCode = errorCode.value ?: 0
+                result.errorStringId = when (errorCode.value) {
+                    // Values from src/cryfs/impl/ErrorCodes.h
+                    11 -> {
+                        result.worthRetry = true
+                        R.string.wrong_password
+                    }
+                    16 -> R.string.inaccessible_base_dir
+                    19 -> R.string.config_load_error
+                    20 -> R.string.filesystem_id_changed
+                    else -> 0
+                }
+            } else {
+                result.volume = CryfsVolume(fusePtr)
+            }
+            return result.build()
+        }
+
+        fun create(baseDir: String, localStateDir: String, password: ByteArray, returnedHash: ObjRef<ByteArray?>?, cipher: String?): EncryptedVolume? {
+            return init(baseDir, localStateDir, password, null, returnedHash, true, cipher).volume
+        }
+
+        fun init(baseDir: String, localStateDir: String, password: ByteArray?, givenHash: ByteArray?, returnedHash: ObjRef<ByteArray?>?): InitResult {
+            return init(baseDir, localStateDir, password, givenHash, returnedHash, false, null)
+        }
+
+        fun changePassword(
+            baseDir: String, filesDir: String, currentPassword: ByteArray?,
+            givenHash: ByteArray?,
+            newPassword: ByteArray,
+            returnedHash: ObjRef<ByteArray?>?
+        ): Boolean {
+            return nativeChangeEncryptionKey(baseDir, getLocalStateDir(filesDir), currentPassword, givenHash, newPassword, returnedHash)
+        }
+    }
+
+    constructor(parcel: Parcel) : this(parcel.readLong())
+
+    override fun writeToParcel(parcel: Parcel, flags: Int) = with(parcel) {
+        writeByte(CRYFS_VOLUME_TYPE)
+        writeLong(fusePtr)
+    }
+
+    override fun openFileReadMode(path: String): Long {
+        return nativeOpen(fusePtr, path, 0)
+    }
+
+    override fun openFileWriteMode(path: String): Long {
+        val fileHandle = nativeOpen(fusePtr, path, 0)
+        return if (fileHandle == -1L) {
+            nativeCreate(fusePtr, path, 0)
+        } else {
+            fileHandle
+        }
+    }
+
+    override fun read(fileHandle: Long, fileOffset: Long, buffer: ByteArray, dstOffset: Long, length: Long): Int {
+        return nativeRead(fusePtr, fileHandle, fileOffset, buffer, dstOffset, length)
+    }
+
+    override fun write(fileHandle: Long, fileOffset: Long, buffer: ByteArray, srcOffset: Long, length: Long): Int {
+        return nativeWrite(fusePtr, fileHandle, fileOffset, buffer, srcOffset, length)
+    }
+
+    override fun truncate(path: String, size: Long): Boolean {
+        return nativeTruncate(fusePtr, path, size)
+    }
+
+    override fun closeFile(fileHandle: Long): Boolean {
+        return nativeCloseFile(fusePtr, fileHandle)
+    }
+
+    override fun deleteFile(path: String): Boolean {
+        return nativeDeleteFile(fusePtr, path)
+    }
+
+    override fun readDir(path: String): MutableList<ExplorerElement>? {
+        return nativeReadDir(fusePtr, path)
+    }
+
+    override fun mkdir(path: String): Boolean {
+        return nativeMkdir(fusePtr, path, Stat.S_IFDIR)
+    }
+
+    override fun rmdir(path: String): Boolean {
+        return nativeRmdir(fusePtr, path)
+    }
+
+    override fun getAttr(path: String): Stat? {
+        return nativeGetAttr(fusePtr, path)
+    }
+
+    override fun rename(srcPath: String, dstPath: String): Boolean {
+        return nativeRename(fusePtr, srcPath, dstPath)
+    }
+
+    override fun close() {
+        return nativeClose(fusePtr)
+    }
+
+    override fun isClosed(): Boolean {
+        return nativeIsClosed(fusePtr)
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/filesystems/EncryptedVolume.kt

@@ -0,0 +1,225 @@
+package sushi.hardcore.droidfs.filesystems
+
+import android.content.Context
+import android.net.Uri
+import android.os.Parcel
+import android.os.Parcelable
+import sushi.hardcore.droidfs.Constants
+import sushi.hardcore.droidfs.VolumeData
+import sushi.hardcore.droidfs.explorers.ExplorerElement
+import sushi.hardcore.droidfs.util.ObjRef
+import java.io.File
+import java.io.FileOutputStream
+import java.io.InputStream
+import java.io.OutputStream
+
+abstract class EncryptedVolume: Parcelable {
+
+    class InitResult(
+        val errorCode: Int,
+        val errorStringId: Int,
+        val worthRetry: Boolean,
+        val volume: EncryptedVolume?,
+    ) {
+        class Builder {
+            var errorCode = 0
+            var errorStringId = 0
+            var worthRetry = false
+            var volume: EncryptedVolume? = null
+
+            fun build() = InitResult(errorCode, errorStringId, worthRetry, volume)
+        }
+    }
+
+    companion object {
+        const val GOCRYPTFS_VOLUME_TYPE: Byte = 0
+        const val CRYFS_VOLUME_TYPE: Byte = 1
+
+        @JvmField
+        val CREATOR = object : Parcelable.Creator<EncryptedVolume> {
+            override fun createFromParcel(parcel: Parcel): EncryptedVolume {
+                return when (parcel.readByte()) {
+                    GOCRYPTFS_VOLUME_TYPE -> GocryptfsVolume(parcel)
+                    CRYFS_VOLUME_TYPE -> CryfsVolume(parcel)
+                    else -> throw invalidVolumeType()
+                }
+            }
+            override fun newArray(size: Int) = arrayOfNulls<EncryptedVolume>(size)
+        }
+
+        /**
+         * Get the type of a volume.
+         *
+         * @return The volume type or -1 if the path is not recognized as a volume
+         */
+        fun getVolumeType(path: String): Byte {
+            return if (File(path, GocryptfsVolume.CONFIG_FILE_NAME).isFile) {
+                GOCRYPTFS_VOLUME_TYPE
+            } else if (File(path, CryfsVolume.CONFIG_FILE_NAME).isFile) {
+                CRYFS_VOLUME_TYPE
+            } else {
+                -1
+            }
+        }
+
+        fun init(
+            volume: VolumeData,
+            filesDir: String,
+            password: ByteArray?,
+            givenHash: ByteArray?,
+            returnedHash: ObjRef<ByteArray?>?
+        ): InitResult {
+            return when (volume.type) {
+                GOCRYPTFS_VOLUME_TYPE -> {
+                    GocryptfsVolume.init(
+                        volume.getFullPath(filesDir),
+                        password,
+                        givenHash,
+                        returnedHash?.apply {
+                            value = ByteArray(GocryptfsVolume.KeyLen)
+                        }?.value
+                    )
+                }
+                CRYFS_VOLUME_TYPE -> {
+                    CryfsVolume.init(volume.getFullPath(filesDir), CryfsVolume.getLocalStateDir(filesDir), password, givenHash, returnedHash)
+                }
+                else -> throw invalidVolumeType()
+            }
+        }
+
+        private fun invalidVolumeType(): java.lang.RuntimeException {
+            return RuntimeException("Invalid volume type")
+        }
+    }
+
+    override fun describeContents() = 0
+
+    abstract fun openFileReadMode(path: String): Long
+    abstract fun openFileWriteMode(path: String): Long
+    abstract fun read(fileHandle: Long, fileOffset: Long, buffer: ByteArray, dstOffset: Long, length: Long): Int
+    abstract fun write(fileHandle: Long, fileOffset: Long, buffer: ByteArray, srcOffset: Long, length: Long): Int
+    abstract fun closeFile(fileHandle: Long): Boolean
+    // Due to gocryptfs internals, truncate requires the file to be open before it is called
+    abstract fun truncate(path: String, size: Long): Boolean
+    abstract fun deleteFile(path: String): Boolean
+    abstract fun readDir(path: String): MutableList<ExplorerElement>?
+    abstract fun mkdir(path: String): Boolean
+    abstract fun rmdir(path: String): Boolean
+    abstract fun getAttr(path: String): Stat?
+    abstract fun rename(srcPath: String, dstPath: String): Boolean
+    abstract fun close()
+    abstract fun isClosed(): Boolean
+
+    fun pathExists(path: String): Boolean {
+        return getAttr(path) != null
+    }
+
+    fun exportFile(fileHandle: Long, os: OutputStream): Boolean {
+        var offset: Long = 0
+        val ioBuffer = ByteArray(Constants.IO_BUFF_SIZE)
+        var length: Int
+        while (read(fileHandle, offset, ioBuffer, 0, ioBuffer.size.toLong()).also { length = it } > 0) {
+            os.write(ioBuffer, 0, length)
+            offset += length.toLong()
+        }
+        os.close()
+        return true
+    }
+
+    fun exportFile(src_path: String, os: OutputStream): Boolean {
+        var success = false
+        val srcfileHandle = openFileReadMode(src_path)
+        if (srcfileHandle != -1L) {
+            success = exportFile(srcfileHandle, os)
+            closeFile(srcfileHandle)
+        }
+        return success
+    }
+
+    fun exportFile(src_path: String, dst_path: String): Boolean {
+        return exportFile(src_path, FileOutputStream(dst_path))
+    }
+
+    fun exportFile(context: Context, src_path: String, output_path: Uri): Boolean {
+        val os = context.contentResolver.openOutputStream(output_path)
+        if (os != null) {
+            return exportFile(src_path, os)
+        }
+        return false
+    }
+
+    fun importFile(inputStream: InputStream, dst_path: String): Boolean {
+        val dstfileHandle = openFileWriteMode(dst_path)
+        if (dstfileHandle != -1L) {
+            var success = true
+            var offset: Long = 0
+            val ioBuffer = ByteArray(Constants.IO_BUFF_SIZE)
+            var length: Long
+            while (inputStream.read(ioBuffer).also { length = it.toLong() } > 0) {
+                val written = write(dstfileHandle, offset, ioBuffer, 0, length).toLong()
+                if (written == length) {
+                    offset += written
+                } else {
+                    success = false
+                    break
+                }
+            }
+            truncate(dst_path, offset)
+            closeFile(dstfileHandle)
+            inputStream.close()
+            return success
+        }
+        return false
+    }
+
+    fun importFile(context: Context, src_uri: Uri, dst_path: String): Boolean {
+        val inputStream = context.contentResolver.openInputStream(src_uri)
+        if (inputStream != null) {
+            return importFile(inputStream, dst_path)
+        }
+        return false
+    }
+
+    fun loadWholeFile(fullPath: String, size: Long? = null, maxSize: Long? = null): Pair<ByteArray?, Int> {
+        val fileSize = size ?: getAttr(fullPath)?.size ?: -1
+        return if (fileSize >= 0) {
+            maxSize?.let {
+                if (fileSize > it) {
+                    return Pair(null, 0)
+                }
+            }
+            try {
+                val fileBuff = ByteArray(fileSize.toInt())
+                val fileHandle = openFileReadMode(fullPath)
+                if (fileHandle == -1L) {
+                    Pair(null, 3)
+                } else {
+                    var offset: Long = 0
+                    while (offset < fileSize && read(fileHandle, offset, fileBuff, offset, fileSize-offset).also { offset += it } > 0) {}
+                    closeFile(fileHandle)
+                    if (offset == fileBuff.size.toLong()) {
+                        Pair(fileBuff, 0)
+                    } else {
+                        Pair(null, 4)
+                    }
+                }
+            } catch (e: OutOfMemoryError) {
+                Pair(null, 2)
+            }
+        } else {
+            Pair(null, 1)
+        }
+    }
+
+    fun recursiveMapFiles(rootPath: String): MutableList<ExplorerElement>? {
+        val result = mutableListOf<ExplorerElement>()
+        val explorerElements = readDir(rootPath) ?: return null
+        result.addAll(explorerElements)
+        for (e in explorerElements) {
+            if (e.isDirectory) {
+                result.addAll(recursiveMapFiles(e.fullPath) ?: return null)
+            }
+        }
+        return result
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/filesystems/GocryptfsVolume.kt

@@ -0,0 +1,166 @@
+package sushi.hardcore.droidfs.filesystems
+
+import android.os.Parcel
+import android.util.Log
+import sushi.hardcore.droidfs.R
+import sushi.hardcore.droidfs.explorers.ExplorerElement
+import sushi.hardcore.droidfs.util.ObjRef
+import kotlin.math.min
+
+class GocryptfsVolume(private val sessionID: Int): EncryptedVolume() {
+    private external fun native_close(sessionID: Int)
+    private external fun native_is_closed(sessionID: Int): Boolean
+    private external fun native_list_dir(sessionID: Int, dir_path: String): MutableList<ExplorerElement>?
+    private external fun native_open_read_mode(sessionID: Int, file_path: String): Int
+    private external fun native_open_write_mode(sessionID: Int, file_path: String, mode: Int): Int
+    private external fun native_read_file(sessionID: Int, handleID: Int, fileOffset: Long, buff: ByteArray, dstOffset: Long, length: Int): Int
+    private external fun native_write_file(sessionID: Int, handleID: Int, fileOffset: Long, buff: ByteArray, srcOffset: Long, length: Int): Int
+    private external fun native_truncate(sessionID: Int, path: String, offset: Long): Boolean
+    private external fun native_close_file(sessionID: Int, handleID: Int)
+    private external fun native_remove_file(sessionID: Int, file_path: String): Boolean
+    private external fun native_mkdir(sessionID: Int, dir_path: String, mode: Int): Boolean
+    private external fun native_rmdir(sessionID: Int, dir_path: String): Boolean
+    private external fun native_get_attr(sessionID: Int, file_path: String): Stat?
+    private external fun native_rename(sessionID: Int, old_path: String, new_path: String): Boolean
+
+    companion object {
+        const val KeyLen = 32
+        private const val ScryptDefaultLogN = 16
+        private const val VOLUME_CREATOR = "DroidFS"
+        private const val MAX_KERNEL_WRITE = 128*1024
+        const val CONFIG_FILE_NAME = "gocryptfs.conf"
+        private external fun nativeCreateVolume(
+            root_cipher_dir: String,
+            password: ByteArray,
+            plainTextNames: Boolean,
+            xchacha: Int,
+            logN: Int,
+            creator: String,
+            returnedHash: ByteArray?,
+        ): Int
+        private external fun nativeInit(root_cipher_dir: String, password: ByteArray?, givenHash: ByteArray?, returnedHash: ByteArray?): Int
+        external fun changePassword(
+            root_cipher_dir: String,
+            currentPassword: ByteArray?,
+            givenHash: ByteArray?,
+            newPassword: ByteArray,
+            returnedHash: ByteArray?
+        ): Boolean
+
+        fun createAndOpenVolume(
+            root_cipher_dir: String,
+            password: ByteArray,
+            plainTextNames: Boolean,
+            xchacha: Int,
+            returnedHash: ByteArray?,
+            volume: ObjRef<EncryptedVolume?>
+        ): Boolean {
+            return when (val result = nativeCreateVolume(
+                root_cipher_dir,
+                password,
+                plainTextNames,
+                xchacha,
+                ScryptDefaultLogN,
+                VOLUME_CREATOR,
+                returnedHash,
+            )) {
+                -1 -> {
+                    Log.e("gocryptfs", "Failed to open volume after creation")
+                    true
+                }
+                -2 -> false
+                else -> {
+                    volume.value = GocryptfsVolume(result)
+                    true
+                }
+            }
+        }
+
+        fun init(root_cipher_dir: String, password: ByteArray?, givenHash: ByteArray?, returnedHash: ByteArray?): InitResult {
+            val sessionId = nativeInit(root_cipher_dir, password, givenHash, returnedHash)
+            val result = InitResult.Builder()
+            if (sessionId < 0) {
+                result.errorCode = sessionId
+                result.errorStringId = when (sessionId) {
+                    -1 -> R.string.config_load_error
+                    -2 -> {
+                        result.worthRetry = true
+                        R.string.wrong_password
+                    }
+                    else -> 0
+                }
+            } else {
+                result.volume = GocryptfsVolume(sessionId)
+            }
+            return result.build()
+        }
+
+        init {
+            System.loadLibrary("gocryptfs_jni")
+        }
+    }
+
+    constructor(parcel: Parcel) : this(parcel.readInt())
+
+    override fun openFileReadMode(path: String): Long {
+        return native_open_read_mode(sessionID, path).toLong()
+    }
+
+    override fun openFileWriteMode(path: String): Long {
+        return native_open_write_mode(sessionID, path, 384).toLong() // 0600
+    }
+
+    override fun read(fileHandle: Long, fileOffset: Long, buffer: ByteArray, dstOffset: Long, length: Long): Int {
+        return native_read_file(sessionID, fileHandle.toInt(), fileOffset, buffer, dstOffset, min(length.toInt(), MAX_KERNEL_WRITE))
+    }
+
+    override fun readDir(path: String): MutableList<ExplorerElement>? {
+        return native_list_dir(sessionID, path)
+    }
+
+    override fun getAttr(path: String): Stat? {
+        return native_get_attr(sessionID, path)
+    }
+
+    override fun writeToParcel(parcel: Parcel, flags: Int) = with(parcel) {
+        writeByte(GOCRYPTFS_VOLUME_TYPE)
+        writeInt(sessionID)
+    }
+
+    override fun close() {
+        native_close(sessionID)
+    }
+
+    override fun isClosed(): Boolean {
+        return native_is_closed(sessionID)
+    }
+
+    override fun mkdir(path: String): Boolean {
+        return native_mkdir(sessionID, path, 448) // 0700
+    }
+
+    override fun rmdir(path: String): Boolean {
+        return native_rmdir(sessionID, path)
+    }
+
+    override fun closeFile(fileHandle: Long): Boolean {
+        native_close_file(sessionID, fileHandle.toInt())
+        return true
+    }
+
+    override fun write(fileHandle: Long, fileOffset: Long, buffer: ByteArray, srcOffset: Long, length: Long): Int {
+        return native_write_file(sessionID, fileHandle.toInt(), fileOffset, buffer, srcOffset, min(length.toInt(), MAX_KERNEL_WRITE))
+    }
+
+    override fun truncate(path: String, size: Long): Boolean {
+        return native_truncate(sessionID, path, size)
+    }
+
+    override fun deleteFile(path: String): Boolean {
+        return native_remove_file(sessionID, path)
+    }
+
+    override fun rename(srcPath: String, dstPath: String): Boolean {
+        return native_rename(sessionID, srcPath, dstPath)
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/filesystems/Stat.kt

@@ -0,0 +1,17 @@
+package sushi.hardcore.droidfs.filesystems
+
+class Stat(mode: Int, var size: Long, val mTime: Long) {
+    companion object {
+        private const val S_IFMT = 0xF000
+        const val S_IFDIR = 0x4000
+        const val S_IFREG = 0x8000
+        const val S_IFLNK = 0xA000
+        const val PARENT_FOLDER_TYPE = 0xE000
+
+        fun parentFolderStat(): Stat {
+            return Stat(PARENT_FOLDER_TYPE, -1, -1)
+        }
+    }
+
+    val type = mode and S_IFMT
+}

app/src/main/java/sushi/hardcore/droidfs/util/Compat.kt

@@ -0,0 +1,23 @@
+package sushi.hardcore.droidfs.util
+
+import android.os.Build
+import android.os.Bundle
+import android.os.Parcelable
+
+object Compat {
+    inline fun <reified T: Parcelable> getParcelable(bundle: Bundle, name: String): T? {
+        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            bundle.getParcelable(name, T::class.java)
+        } else {
+            @Suppress("Deprecation")
+            bundle.getParcelable(name)
+        }
+    }
+
+   val MEMFD_CREATE_MINIMUM_KERNEL_VERSION = Version("3.17")
+
+    fun isMemFileSupported(): Boolean {
+        val kernel = System.getProperty("os.version") ?: return false
+        return Version(kernel) >= MEMFD_CREATE_MINIMUM_KERNEL_VERSION
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/util/IntentUtils.kt

@@ -0,0 +1,21 @@
+package sushi.hardcore.droidfs.util
+
+import android.content.Intent
+import android.os.Build
+import android.os.Parcelable
+
+object IntentUtils {
+    inline fun <reified T: Parcelable> getParcelableExtra(intent: Intent, name: String): T? {
+        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            intent.getParcelableExtra(name, T::class.java)
+        } else {
+            @Suppress("Deprecation")
+            intent.getParcelableExtra(name)
+        }
+    }
+
+    fun forwardIntent(sourceIntent: Intent, targetIntent: Intent) {
+        targetIntent.action = sourceIntent.action
+        sourceIntent.extras?.let { targetIntent.putExtras(it) }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/util/ObjRef.kt

@@ -0,0 +1,3 @@
+package sushi.hardcore.droidfs.util
+
+class ObjRef<T>(var value: T)

app/src/main/java/sushi/hardcore/droidfs/util/PathUtils.kt

@@ -3,33 +3,37 @@ package sushi.hardcore.droidfs.util
 import android.content.ActivityNotFoundException
 import android.content.Context
 import android.net.Uri
+import android.os.Build
+import android.os.Environment
 import android.os.storage.StorageManager
 import android.provider.DocumentsContract
 import android.provider.OpenableColumns
+import android.util.Log
 import androidx.activity.result.ActivityResultLauncher
 import androidx.core.content.ContextCompat
 import sushi.hardcore.droidfs.R
+import sushi.hardcore.droidfs.Theme
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import java.io.File
 import java.text.DecimalFormat
 import kotlin.math.log10
+import kotlin.math.max
 import kotlin.math.pow
 
 object PathUtils {
+    const val SEPARATOR = '/'
+    const val PATH_RESOLVER_TAG = "PATH RESOLVER"
+
     fun getParentPath(path: String): String {
-        return if (path.endsWith("/")) {
+        val strippedPath = if (path.endsWith(SEPARATOR)) {
-            val a = path.substring(0, path.length - 2)
+            path.substring(0, max(1, path.length - 1))
-            if (a.contains("/")) {
-                a.substring(0, a.lastIndexOf("/"))
-            } else {
-                ""
-            }
         } else {
-            if (path.contains("/")) {
+            path
-                path.substring(0, path.lastIndexOf("/"))
+        }
-            } else {
+        return if (strippedPath.count { it == SEPARATOR } <= 1) {
-                ""
+            SEPARATOR.toString()
-            }
+        } else {
+            strippedPath.substring(0, strippedPath.lastIndexOf(SEPARATOR))
         }
     }
 
@@ -37,27 +41,21 @@ object PathUtils {
         val result = StringBuilder()
         for (element in strings) {
             if (element.isNotEmpty()) {
-                result.append(element)
+                if (!element.startsWith(SEPARATOR) && result.last() != SEPARATOR) {
-                if (!element.endsWith("/")) {
+                    result.append(SEPARATOR)
-                    result.append("/")
                 }
+                result.append(element)
             }
         }
-        return result.substring(0, result.length - 1)
+        return result.toString()
     }
 
     fun getRelativePath(parentPath: String, childPath: String): String {
-        return when {
+        return childPath.substring(parentPath.length + if (parentPath.endsWith(SEPARATOR) || childPath.length == parentPath.length) {
-            parentPath.isEmpty() -> {
+            0
-                childPath
+        } else {
-            }
+            1
-            parentPath.length == childPath.length -> {
+        })
-                ""
-            }
-            else -> {
-                childPath.substring(parentPath.length + 1)
-            }
-        }
     }
 
     fun isChildOf(childPath: String, parentPath: String): Boolean {
@@ -79,7 +77,7 @@ object PathUtils {
         if (result == null) {
             result = uri.path
             result?.let {
-                val cut = it.lastIndexOf('/')
+                val cut = it.lastIndexOf(SEPARATOR)
                 if (cut != -1) {
                     result = it.substring(cut + 1)
                 }
@@ -102,11 +100,47 @@ object PathUtils {
         return "Android/data/${context.packageName}/"
     }
 
-    private fun getExternalStoragePath(context: Context): List<String> {
+    private fun getExternalStoragePath(context: Context, name: String): String? {
+        for (dir in ContextCompat.getExternalFilesDirs(context, null)) {
+            Log.d(PATH_RESOLVER_TAG, "External dir: $dir")
+            if (Environment.isExternalStorageRemovable(dir)) {
+                Log.d(PATH_RESOLVER_TAG, "isExternalStorageRemovable")
+                val path = dir.path.split("/Android")[0]
+                if (File(path).name == name) {
+                    return path
+                }
+            }
+        }
+        Log.d(PATH_RESOLVER_TAG, "getExternalFilesDirs failed")
+        // Don't risk to be killed by SELinux on newer Android versions
+        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.Q) {
+            try {
+                val process = ProcessBuilder("mount").redirectErrorStream(true).start().apply { waitFor() }
+                process.inputStream.readBytes().decodeToString().split("\n").forEach { line ->
+                    if (line.startsWith("/dev/block/vold")) {
+                        Log.d(PATH_RESOLVER_TAG, "mount: $line")
+                        val fields = line.split(" ")
+                        if (fields.size >= 3) {
+                            val path = fields[2]
+                            if (File(path).name == name) {
+                                return path
+                            }
+                        }
+                    }
+                }
+            } catch (e: Exception) {
+                e.printStackTrace()
+            }
+            Log.d(PATH_RESOLVER_TAG, "mount processing failed")
+        }
+        return null
+    }
+
+    private fun getExternalStoragesPaths(context: Context): List<String> {
         val externalPaths: MutableList<String> = ArrayList()
         ContextCompat.getExternalFilesDirs(context, null).forEach {
-            val rootPath = it.path.substring(0, it.path.indexOf(getPackageDataFolder(context)+"files"))
+            if (Environment.isExternalStorageRemovable(it)) {
-            if (!rootPath.endsWith("/0/")){ //not primary storage
+                val rootPath = it.path.substring(0, it.path.indexOf(getPackageDataFolder(context)+"files"))
                 externalPaths.add(rootPath)
             }
         }
@@ -114,7 +148,7 @@ object PathUtils {
     }
 
     fun isPathOnExternalStorage(path: String, context: Context): Boolean {
-        getExternalStoragePath(context).forEach {
+        getExternalStoragesPaths(context).forEach {
             if (path.startsWith(it)){
                 return true
             }
@@ -123,18 +157,23 @@ object PathUtils {
     }
 
     private const val PRIMARY_VOLUME_NAME = "primary"
-    fun getFullPathFromTreeUri(treeUri: Uri?, context: Context): String? {
+    fun getFullPathFromTreeUri(treeUri: Uri, context: Context): String? {
-        if (treeUri == null) return null
         if ("content".equals(treeUri.scheme, ignoreCase = true)) {
             val vId = getVolumeIdFromTreeUri(treeUri)
-            var volumePath = getVolumePath(vId, context) ?: return null
+            Log.d(PATH_RESOLVER_TAG, "Volume Id: $vId")
-            if (volumePath.endsWith(File.separator))
+            var volumePath = getVolumePath(vId ?: return null, context)
-                volumePath = volumePath.substring(0, volumePath.length - 1)
+            Log.d(PATH_RESOLVER_TAG, "Volume Path: $volumePath")
-            var documentPath = getDocumentPathFromTreeUri(treeUri)
+            if (volumePath == null) {
-            if (documentPath!!.endsWith(File.separator))
+                volumePath = if (vId == "primary") {
-                documentPath = documentPath.substring(0, documentPath.length - 1)
+                    Environment.getExternalStorageDirectory().path
+                } else {
+                    getExternalStoragePath(context, vId) ?: "/storage/$vId"
+                }
+            }
+            val documentPath = getDocumentPathFromTreeUri(treeUri)!!
+            Log.d(PATH_RESOLVER_TAG, "Document Path: $documentPath")
             return if (documentPath.isNotEmpty()) {
-                pathJoin(volumePath, documentPath)
+                pathJoin(volumePath!!, documentPath)
             } else volumePath
         } else if ("file".equals(treeUri.scheme, ignoreCase = true)) {
             return treeUri.path
@@ -142,7 +181,7 @@ object PathUtils {
         return null
     }
 
-    private fun getVolumePath(volumeId: String?, context: Context): String? {
+    private fun getVolumePath(volumeId: String, context: Context): String? {
         return try {
             val mStorageManager = context.getSystemService(Context.STORAGE_SERVICE) as StorageManager
             val storageVolumeClazz = Class.forName("android.os.storage.StorageVolume")
@@ -192,11 +231,11 @@ object PathUtils {
         return rootDirectory.delete()
     }
 
-     fun safePickDirectory(directoryPicker: ActivityResultLauncher<Uri>, context: Context, themeValue: String) {
+     fun safePickDirectory(directoryPicker: ActivityResultLauncher<Uri?>, context: Context, theme: Theme) {
         try {
             directoryPicker.launch(null)
         } catch (e: ActivityNotFoundException) {
-            CustomAlertDialogBuilder(context, themeValue)
+            CustomAlertDialogBuilder(context, theme)
                 .setTitle(R.string.error)
                 .setMessage(R.string.open_tree_failed)
                 .setPositiveButton(R.string.ok, null)

app/src/main/java/sushi/hardcore/droidfs/util/UIUtils.kt

@@ -0,0 +1,42 @@
+package sushi.hardcore.droidfs.util
+
+import android.content.Context
+import android.view.Menu
+import android.widget.EditText
+import androidx.core.content.ContextCompat
+import sushi.hardcore.droidfs.R
+import java.nio.CharBuffer
+import java.nio.charset.StandardCharsets
+import java.util.*
+
+object UIUtils {
+    fun encodeEditTextContent(editText: EditText): ByteArray {
+        val charArray = CharArray(editText.text.length)
+        editText.text.getChars(0, editText.text.length, charArray, 0)
+        val byteBuffer = StandardCharsets.UTF_8.encode(CharBuffer.wrap(charArray))
+        Arrays.fill(charArray, Char.MIN_VALUE)
+        val byteArray = ByteArray(byteBuffer.remaining())
+        byteBuffer.get(byteArray)
+        Wiper.wipe(byteBuffer)
+        return byteArray
+    }
+
+    class MenuIconColor(
+        private val context: Context,
+        private val menu: Menu,
+        private val color: Int
+    ) {
+        fun applyTo(menuItemId: Int, drawableId: Int) {
+            menu.findItem(menuItemId)?.let {
+                it.icon = ContextCompat.getDrawable(context, drawableId)?.apply {
+                    setTint(color)
+                }
+            }
+        }
+    }
+
+    fun getMenuIconNeutralTint(context: Context, menu: Menu) = MenuIconColor(
+        context, menu,
+        ContextCompat.getColor(context, R.color.neutralIconTint),
+    )
+}

app/src/main/java/sushi/hardcore/droidfs/util/Version.kt

@@ -0,0 +1,29 @@
+package sushi.hardcore.droidfs.util
+
+import java.lang.Integer.max
+
+class Version(inputVersion: String) : Comparable<Version> {
+    private val version: String
+
+    init {
+        val regex = "[0-9]+(\\.[0-9]+)*".toRegex()
+        val match = regex.find(inputVersion) ?: throw IllegalArgumentException("Invalid version format")
+        version = match.value
+    }
+
+    fun split() = version.split(".").toTypedArray()
+
+    override fun compareTo(other: Version) =
+        (split() to other.split()).let { (split, otherSplit) ->
+            val length = max(split.size, otherSplit.size)
+            for (i in 0 until length) {
+                val part = if (i < split.size) split[i].toInt() else 0
+                val otherPart = if (i < otherSplit.size) otherSplit[i].toInt() else 0
+                if (part < otherPart) return -1
+                if (part > otherPart) return 1
+            }
+            0
+        }
+
+    override fun toString() = version
+}

app/src/main/java/sushi/hardcore/droidfs/util/Wiper.kt

@@ -4,14 +4,25 @@ import android.content.Context
 import android.net.Uri
 import android.provider.OpenableColumns
 import androidx.documentfile.provider.DocumentFile
-import sushi.hardcore.droidfs.ConstValues
+import sushi.hardcore.droidfs.Constants
 import sushi.hardcore.droidfs.R
 import java.io.File
 import java.io.FileOutputStream
+import java.nio.ByteBuffer
 import java.util.*
 import kotlin.math.ceil
 
 object Wiper {
+    fun wipe(byteBuffer: ByteBuffer) {
+        if (byteBuffer.hasArray()) {
+            Arrays.fill(byteBuffer.array(), Byte.MIN_VALUE)
+        } else {
+            for (i in 0 until byteBuffer.limit()) {
+                byteBuffer.put(i, Byte.MIN_VALUE)
+            }
+        }
+    }
+
     private const val buff_size = 4096
     fun wipe(context: Context, uri: Uri): String? {
         val cursor = context.contentResolver.query(uri, null, null, null, null)
@@ -25,11 +36,11 @@ object Wiper {
                 val buff = ByteArray(buff_size)
                 Arrays.fill(buff, 0.toByte())
                 val writes = ceil(size.toDouble() / buff_size).toInt()
-                for (i in 0 until ConstValues.WIPE_PASSES) {
+                for (i in 0 until Constants.WIPE_PASSES) {
                     for (j in 0 until writes) {
                         os.write(buff)
                     }
-                    if (i < ConstValues.WIPE_PASSES - 1) {
+                    if (i < Constants.WIPE_PASSES - 1) {
                         //reopening to flush and seek
                         os.close()
                         os = context.contentResolver.openOutputStream(uri)!!
@@ -57,11 +68,11 @@ object Wiper {
             val buff = ByteArray(buff_size)
             Arrays.fill(buff, 0.toByte())
             val writes = ceil(size.toDouble() / buff_size).toInt()
-            for (i in 0 until ConstValues.WIPE_PASSES) {
+            for (i in 0 until Constants.WIPE_PASSES) {
                 for (j in 0 until writes) {
                     os.write(buff)
                 }
-                if (i < ConstValues.WIPE_PASSES - 1) {
+                if (i < Constants.WIPE_PASSES - 1) {
                     //reopening to flush and seek
                     os.close()
                     os = FileOutputStream(file)

app/src/main/java/sushi/hardcore/droidfs/video_recording/AsynchronousSeekableWriter.kt

@@ -0,0 +1,68 @@
+package sushi.hardcore.droidfs.video_recording
+
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.launch
+import sushi.hardcore.droidfs.Constants
+import java.nio.ByteBuffer
+
+class AsynchronousSeekableWriter(private val internalWriter: SeekableWriter): SeekableWriter {
+
+    internal enum class Operation { WRITE, SEEK, CLOSE }
+
+    internal class Task(
+        val operation: Operation,
+        val buffer: ByteArray? = null,
+        val offset: Long? = null,
+    )
+
+    private val channel = Channel<Task>(Channel.UNLIMITED)
+
+    private fun flush(buffer: ByteBuffer) {
+        internalWriter.write(buffer.array(), buffer.position())
+        buffer.position(0)
+    }
+
+    fun start() {
+        CoroutineScope(Dispatchers.IO).launch {
+            val buffer = ByteBuffer.allocate(Constants.IO_BUFF_SIZE)
+            while (true) {
+                val task = channel.receive()
+                when (task.operation) {
+                    Operation.WRITE -> {
+                        if (task.buffer!!.size > buffer.remaining()) {
+                            flush(buffer)
+                        }
+                        buffer.put(task.buffer)
+                    }
+                    Operation.SEEK -> {
+                        if (buffer.position() > 0) {
+                            flush(buffer)
+                        }
+                        internalWriter.seek(task.offset!!)
+                    }
+                    Operation.CLOSE -> {
+                        if (buffer.position() > 0) {
+                            flush(buffer)
+                        }
+                        internalWriter.close()
+                        break
+                    }
+                }
+            }
+        }
+    }
+
+    override fun write(buffer: ByteArray, size: Int) {
+        channel.trySend(Task(Operation.WRITE, buffer)).exceptionOrNull()?.let { throw it }
+    }
+
+    override fun seek(offset: Long) {
+        channel.trySend(Task(Operation.SEEK, offset = offset)).exceptionOrNull()?.let { throw it }
+    }
+
+    override fun close() {
+        channel.trySend(Task(Operation.CLOSE)).exceptionOrNull()?.let { throw it }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/video_recording/FFmpegMuxer.kt

@@ -0,0 +1,91 @@
+package sushi.hardcore.droidfs.video_recording
+
+import android.media.MediaCodec
+import android.media.MediaFormat
+import androidx.camera.video.MediaMuxer
+import java.nio.ByteBuffer
+
+class FFmpegMuxer(val writer: SeekableWriter): MediaMuxer {
+    external fun allocContext(): Long
+    external fun addVideoTrack(formatContext: Long, bitrate: Int, frameRate: Int, width: Int, height: Int, orientationHint: Int): Int
+    external fun addAudioTrack(formatContext: Long, bitrate: Int, sampleRate: Int, channelCount: Int): Int
+    external fun writeHeaders(formatContext: Long): Int
+    external fun writePacket(formatContext: Long, buffer: ByteArray, pts: Long, streamIndex: Int, isKeyFrame: Boolean)
+    external fun writeTrailer(formatContext: Long)
+    external fun release(formatContext: Long)
+
+    var formatContext: Long?
+
+    var orientation = 0
+    private var videoTrackIndex: Int? = null
+    private var audioTrackIndex: Int? = null
+    private var firstPts: Long? = null
+
+    init {
+        System.loadLibrary("mux")
+        formatContext = allocContext()
+    }
+
+    override fun writeSampleData(trackIndex: Int, buffer: ByteBuffer, bufferInfo: MediaCodec.BufferInfo) {
+        val byteArray = ByteArray(bufferInfo.size)
+        buffer.get(byteArray)
+        if (firstPts == null) {
+            firstPts = bufferInfo.presentationTimeUs
+        }
+        writePacket(
+            formatContext!!, byteArray, bufferInfo.presentationTimeUs - firstPts!!, trackIndex,
+            bufferInfo.flags and MediaCodec.BUFFER_FLAG_KEY_FRAME != 0
+        )
+    }
+
+    override fun addTrack(mediaFormat: MediaFormat): Int {
+        val mime = mediaFormat.getString("mime")!!.split('/')
+        val bitrate = mediaFormat.getInteger("bitrate")
+        return if (mime[0] == "audio") {
+            addAudioTrack(
+                formatContext!!,
+                bitrate,
+                mediaFormat.getInteger("sample-rate"),
+                mediaFormat.getInteger("channel-count")
+            ).also {
+                audioTrackIndex = it
+            }
+        } else {
+            addVideoTrack(
+                formatContext!!,
+                bitrate,
+                mediaFormat.getInteger("frame-rate"),
+                mediaFormat.getInteger("width"),
+                mediaFormat.getInteger("height"),
+                orientation
+            ).also {
+               videoTrackIndex = it
+            }
+        }
+    }
+
+    override fun start() {
+        writeHeaders(formatContext!!)
+    }
+    override fun stop() {
+        writeTrailer(formatContext!!)
+    }
+
+    override fun setOrientationHint(degree: Int) {
+        orientation = degree
+    }
+
+    override fun release() {
+        writer.close()
+        release(formatContext!!)
+        firstPts = null
+        formatContext = null
+    }
+
+    fun writePacket(buff: ByteArray) {
+        writer.write(buff, buff.size)
+    }
+    fun seek(offset: Long) {
+        writer.seek(offset)
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/video_recording/MediaMuxer.kt

@@ -1,94 +0,0 @@
-package sushi.hardcore.droidfs.video_recording
-
-import android.media.MediaCodec
-import android.media.MediaFormat
-import java.nio.ByteBuffer
-
-class MediaMuxer(val writer: SeekableWriter) {
-    external fun allocContext(): Long
-    external fun addVideoTrack(formatContext: Long, bitrate: Int, width: Int, height: Int, orientationHint: Int): Int
-    external fun addAudioTrack(formatContext: Long, bitrate: Int, sampleRate: Int, channelCount: Int): Int
-    external fun writeHeaders(formatContext: Long): Int
-    external fun writePacket(formatContext: Long, buffer: ByteArray, pts: Long, streamIndex: Int, isKeyFrame: Boolean)
-    external fun writeTrailer(formatContext: Long)
-    external fun release(formatContext: Long)
-
-    companion object {
-        const val VIDEO_TRACK_INDEX = 0
-        const val AUDIO_TRACK_INDEX = 1
-    }
-
-    var formatContext: Long?
-
-    var orientationHint = 0
-    var realVideoTrackIndex: Int? = null
-    var audioFrameSize: Int? = null
-    var firstPts: Long? = null
-    private var audioPts = 0L
-
-    init {
-        System.loadLibrary("mux")
-        formatContext = allocContext()
-    }
-
-    fun writeSampleData(trackIndex: Int, buffer: ByteBuffer, bufferInfo: MediaCodec.BufferInfo) {
-        val byteArray = ByteArray(bufferInfo.size)
-        buffer.get(byteArray)
-        if (firstPts == null) {
-            firstPts = bufferInfo.presentationTimeUs
-        }
-        if (trackIndex == AUDIO_TRACK_INDEX) {
-            writePacket(formatContext!!, byteArray, audioPts, -1, false)
-            audioPts += audioFrameSize!!
-        } else {
-            writePacket(
-                formatContext!!, byteArray, bufferInfo.presentationTimeUs - firstPts!!, realVideoTrackIndex!!,
-                bufferInfo.flags and MediaCodec.BUFFER_FLAG_KEY_FRAME != 0
-            )
-        }
-    }
-
-    fun addTrack(format: MediaFormat): Int {
-        val mime = format.getString("mime")!!.split('/')
-        val bitrate = format.getInteger("bitrate")
-        return if (mime[0] == "audio") {
-            audioFrameSize = addAudioTrack(
-                formatContext!!,
-                bitrate,
-                format.getInteger("sample-rate"),
-                format.getInteger("channel-count")
-            )
-            AUDIO_TRACK_INDEX
-        } else {
-            realVideoTrackIndex = addVideoTrack(
-                formatContext!!,
-                bitrate,
-                format.getInteger("width"),
-                format.getInteger("height"),
-                orientationHint
-            )
-            VIDEO_TRACK_INDEX
-        }
-    }
-
-    fun start() {
-        writeHeaders(formatContext!!)
-    }
-    fun stop() {
-        writeTrailer(formatContext!!)
-    }
-    fun release() {
-        writer.close()
-        release(formatContext!!)
-        firstPts = null
-        audioPts = 0
-        formatContext = null
-    }
-
-    fun writePacket(buff: ByteArray) {
-        writer.write(buff)
-    }
-    fun seek(offset: Long) {
-        writer.seek(offset)
-    }
-}

app/src/main/java/sushi/hardcore/droidfs/video_recording/SeekableWriter.kt

@@ -1,7 +1,7 @@
 package sushi.hardcore.droidfs.video_recording
 
 interface SeekableWriter {
-    fun write(byteArray: ByteArray)
+    fun write(buffer: ByteArray, size: Int)
     fun seek(offset: Long)
     fun close()
 }

app/src/main/java/sushi/hardcore/droidfs/video_recording/VideoCaptureConfig.java

@@ -1,212 +0,0 @@
-package sushi.hardcore.droidfs.video_recording;
-
-import android.annotation.SuppressLint;
-
-import androidx.annotation.NonNull;
-import androidx.camera.core.impl.Config;
-import androidx.camera.core.impl.ImageFormatConstants;
-import androidx.camera.core.impl.ImageOutputConfig;
-import androidx.camera.core.impl.OptionsBundle;
-import androidx.camera.core.impl.UseCaseConfig;
-import androidx.camera.core.internal.ThreadConfig;
-
-/**
- * Config for a video capture use case.
- *
- * <p>In the earlier stage, the VideoCapture is deprioritized.
- */
-@SuppressLint("RestrictedApi")
-public final class VideoCaptureConfig
-        implements UseCaseConfig<VideoCapture>,
-        ImageOutputConfig,
-        ThreadConfig {
-
-    // Option Declarations:
-    // *********************************************************************************************
-
-    public static final Option<Integer> OPTION_VIDEO_FRAME_RATE =
-            Option.create("camerax.core.videoCapture.recordingFrameRate", int.class);
-    public static final Option<Integer> OPTION_BIT_RATE =
-            Option.create("camerax.core.videoCapture.bitRate", int.class);
-    public static final Option<Integer> OPTION_INTRA_FRAME_INTERVAL =
-            Option.create("camerax.core.videoCapture.intraFrameInterval", int.class);
-    public static final Option<Integer> OPTION_AUDIO_BIT_RATE =
-            Option.create("camerax.core.videoCapture.audioBitRate", int.class);
-    public static final Option<Integer> OPTION_AUDIO_SAMPLE_RATE =
-            Option.create("camerax.core.videoCapture.audioSampleRate", int.class);
-    public static final Option<Integer> OPTION_AUDIO_CHANNEL_COUNT =
-            Option.create("camerax.core.videoCapture.audioChannelCount", int.class);
-    public static final Option<Integer> OPTION_AUDIO_MIN_BUFFER_SIZE =
-            Option.create("camerax.core.videoCapture.audioMinBufferSize", int.class);
-
-    // *********************************************************************************************
-
-    private final OptionsBundle mConfig;
-
-    public VideoCaptureConfig(@NonNull OptionsBundle config) {
-        mConfig = config;
-    }
-
-    /**
-     * Returns the recording frames per second.
-     *
-     * @param valueIfMissing The value to return if this configuration option has not been set.
-     * @return The stored value or <code>valueIfMissing</code> if the value does not exist in this
-     * configuration.
-     */
-    public int getVideoFrameRate(int valueIfMissing) {
-        return retrieveOption(OPTION_VIDEO_FRAME_RATE, valueIfMissing);
-    }
-
-    /**
-     * Returns the recording frames per second.
-     *
-     * @return The stored value, if it exists in this configuration.
-     * @throws IllegalArgumentException if the option does not exist in this configuration.
-     */
-    public int getVideoFrameRate() {
-        return retrieveOption(OPTION_VIDEO_FRAME_RATE);
-    }
-
-    /**
-     * Returns the encoding bit rate.
-     *
-     * @param valueIfMissing The value to return if this configuration option has not been set.
-     * @return The stored value or <code>valueIfMissing</code> if the value does not exist in this
-     * configuration.
-     */
-    public int getBitRate(int valueIfMissing) {
-        return retrieveOption(OPTION_BIT_RATE, valueIfMissing);
-    }
-
-    /**
-     * Returns the encoding bit rate.
-     *
-     * @return The stored value, if it exists in this configuration.
-     * @throws IllegalArgumentException if the option does not exist in this configuration.
-     */
-    public int getBitRate() {
-        return retrieveOption(OPTION_BIT_RATE);
-    }
-
-    /**
-     * Returns the number of seconds between each key frame.
-     *
-     * @param valueIfMissing The value to return if this configuration option has not been set.
-     * @return The stored value or <code>valueIfMissing</code> if the value does not exist in this
-     * configuration.
-     */
-    public int getIFrameInterval(int valueIfMissing) {
-        return retrieveOption(OPTION_INTRA_FRAME_INTERVAL, valueIfMissing);
-    }
-
-    /**
-     * Returns the number of seconds between each key frame.
-     *
-     * @return The stored value, if it exists in this configuration.
-     * @throws IllegalArgumentException if the option does not exist in this configuration.
-     */
-    public int getIFrameInterval() {
-        return retrieveOption(OPTION_INTRA_FRAME_INTERVAL);
-    }
-
-    /**
-     * Returns the audio encoding bit rate.
-     *
-     * @param valueIfMissing The value to return if this configuration option has not been set.
-     * @return The stored value or <code>valueIfMissing</code> if the value does not exist in this
-     * configuration.
-     */
-    public int getAudioBitRate(int valueIfMissing) {
-        return retrieveOption(OPTION_AUDIO_BIT_RATE, valueIfMissing);
-    }
-
-    /**
-     * Returns the audio encoding bit rate.
-     *
-     * @return The stored value, if it exists in this configuration.
-     * @throws IllegalArgumentException if the option does not exist in this configuration.
-     */
-    public int getAudioBitRate() {
-        return retrieveOption(OPTION_AUDIO_BIT_RATE);
-    }
-
-    /**
-     * Returns the audio sample rate.
-     *
-     * @param valueIfMissing The value to return if this configuration option has not been set.
-     * @return The stored value or <code>valueIfMissing</code> if the value does not exist in this
-     * configuration.
-     */
-    public int getAudioSampleRate(int valueIfMissing) {
-        return retrieveOption(OPTION_AUDIO_SAMPLE_RATE, valueIfMissing);
-    }
-
-    /**
-     * Returns the audio sample rate.
-     *
-     * @return The stored value, if it exists in this configuration.
-     * @throws IllegalArgumentException if the option does not exist in this configuration.
-     */
-    public int getAudioSampleRate() {
-        return retrieveOption(OPTION_AUDIO_SAMPLE_RATE);
-    }
-
-    /**
-     * Returns the audio channel count.
-     *
-     * @param valueIfMissing The value to return if this configuration option has not been set.
-     * @return The stored value or <code>valueIfMissing</code> if the value does not exist in this
-     * configuration.
-     */
-    public int getAudioChannelCount(int valueIfMissing) {
-        return retrieveOption(OPTION_AUDIO_CHANNEL_COUNT, valueIfMissing);
-    }
-
-    /**
-     * Returns the audio channel count.
-     *
-     * @return The stored value, if it exists in this configuration.
-     * @throws IllegalArgumentException if the option does not exist in this configuration.
-     */
-    public int getAudioChannelCount() {
-        return retrieveOption(OPTION_AUDIO_CHANNEL_COUNT);
-    }
-
-    /**
-     * Returns the audio minimum buffer size, in bytes.
-     *
-     * @param valueIfMissing The value to return if this configuration option has not been set.
-     * @return The stored value or <code>valueIfMissing</code> if the value does not exist in this
-     * configuration.
-     */
-    public int getAudioMinBufferSize(int valueIfMissing) {
-        return retrieveOption(OPTION_AUDIO_MIN_BUFFER_SIZE, valueIfMissing);
-    }
-
-    /**
-     * Returns the audio minimum buffer size, in bytes.
-     *
-     * @return The stored value, if it exists in this configuration.
-     * @throws IllegalArgumentException if the option does not exist in this configuration.
-     */
-    public int getAudioMinBufferSize() {
-        return retrieveOption(OPTION_AUDIO_MIN_BUFFER_SIZE);
-    }
-
-    /**
-     * Retrieves the format of the image that is fed as input.
-     *
-     * <p>This should always be PRIVATE for VideoCapture.
-     */
-    @Override
-    public int getInputFormat() {
-        return ImageFormatConstants.INTERNAL_DEFINED_IMAGE_FORMAT_PRIVATE;
-    }
-
-    @NonNull
-    @Override
-    public Config getConfig() {
-        return mConfig;
-    }
-}

app/src/main/java/sushi/hardcore/droidfs/widgets/CircleClipTapView.kt

@@ -146,16 +146,16 @@ internal class CircleClipTapView(context: Context, attrs: AttributeSet): View(co
                 }
 
                 addListener(object : Animator.AnimatorListener {
-                    override fun onAnimationStart(animation: Animator?) {
+                    override fun onAnimationStart(animation: Animator) {
                         visibility = VISIBLE
                     }
 
-                    override fun onAnimationEnd(animation: Animator?) {
+                    override fun onAnimationEnd(animation: Animator) {
                         if (!forceReset) performAtEnd()
                     }
 
-                    override fun onAnimationRepeat(animation: Animator?) {}
+                    override fun onAnimationRepeat(animation: Animator) {}
-                    override fun onAnimationCancel(animation: Animator?) {}
+                    override fun onAnimationCancel(animation: Animator) {}
                 })
             }
         }
@@ -185,14 +185,14 @@ internal class CircleClipTapView(context: Context, attrs: AttributeSet): View(co
         updatePathShape()
     }
 
-    override fun onDraw(canvas: Canvas?) {
+    override fun onDraw(canvas: Canvas) {
         super.onDraw(canvas)
 
         // Background
-        canvas?.clipPath(shapePath)
+        canvas.clipPath(shapePath)
-        canvas?.drawPath(shapePath, backgroundPaint)
+        canvas.drawPath(shapePath, backgroundPaint)
 
         // Circle
-        canvas?.drawCircle(cX, cY, currentRadius, circlePaint)
+        canvas.drawCircle(cX, cY, currentRadius, circlePaint)
     }
 }

app/src/main/java/sushi/hardcore/droidfs/widgets/CustomAlertDialogBuilder.kt

@@ -7,22 +7,30 @@ import androidx.appcompat.app.AlertDialog
 import androidx.core.view.WindowInsetsCompat
 import androidx.core.view.WindowInsetsControllerCompat
 import sushi.hardcore.droidfs.R
+import sushi.hardcore.droidfs.Theme
 
-open class CustomAlertDialogBuilder(context: Context, theme: String) : AlertDialog.Builder(
+open class CustomAlertDialogBuilder(context: Context, theme: Theme) : AlertDialog.Builder(
-    context, when (theme) {
+    context, if (theme.black) {
-        "black_green" -> R.style.BlackGreenDialog
+            when (theme.color) {
-        "dark_red" -> R.style.DarkRedDialog
+                "red" -> R.style.BlackRedDialog
-        "black_red" -> R.style.BlackRedDialog
+                "blue" -> R.style.BlackBlueDialog
-        "dark_blue" -> R.style.DarkBlueDialog
+                "yellow" -> R.style.BlackYellowDialog
-        "black_blue" -> R.style.BlackBlueDialog
+                "orange" -> R.style.BlackOrangeDialog
-        "dark_yellow" -> R.style.DarkYellowDialog
+                "purple" -> R.style.BlackPurpleDialog
-        "black_yellow" -> R.style.BlackYellowDialog
+                "pink" -> R.style.BlackPinkDialog
-        "dark_orange" -> R.style.DarkOrangeDialog
+                else -> R.style.BlackGreenDialog
-        "black_orange" -> R.style.BlackOrangeDialog
+            }
-        "dark_purple" -> R.style.DarkPurpleDialog
+        } else {
-        "black_purple" -> R.style.BlackPurpleDialog
+            when (theme.color) {
-        else -> R.style.DarkGreenDialog
+                "red" -> R.style.DarkRedDialog
-    }
+                "blue" -> R.style.DarkBlueDialog
+                "yellow" -> R.style.DarkYellowDialog
+                "orange" -> R.style.DarkOrangeDialog
+                "purple" -> R.style.DarkPurpleDialog
+                "pink" -> R.style.DarkPinkDialog
+                else -> R.style.DarkGreenDialog
+            }
+        }
 ) {
     private var keepFullScreen = false
 

app/src/main/java/sushi/hardcore/droidfs/widgets/DoubleTapPlayerView.kt

@@ -17,14 +17,14 @@ import android.widget.LinearLayout
 import androidx.core.view.GestureDetectorCompat
 import androidx.core.view.updateLayoutParams
 import androidx.core.view.updatePadding
-import com.google.android.exoplayer2.ui.StyledPlayerView
+import androidx.media3.ui.PlayerView
 import sushi.hardcore.droidfs.R
 
 class DoubleTapPlayerView @JvmOverloads constructor(
     context: Context,
     attrs: AttributeSet? = null,
     defStyleAttr: Int = 0
-) : StyledPlayerView(context, attrs, defStyleAttr) {
+) : PlayerView(context, attrs, defStyleAttr) {
 
     companion object {
         const val SEEK_SECONDS = 10
@@ -46,7 +46,7 @@ class DoubleTapPlayerView @JvmOverloads constructor(
             return true
         }
 
-        override fun onSingleTapConfirmed(e: MotionEvent?): Boolean {
+        override fun onSingleTapConfirmed(e: MotionEvent): Boolean {
             if (!isDoubleTapping)
                 performClick()
             return true
@@ -88,7 +88,7 @@ class DoubleTapPlayerView @JvmOverloads constructor(
 
     init {
         if (resources.configuration.orientation == Configuration.ORIENTATION_LANDSCAPE) {
-            updateButtonSize(Configuration.ORIENTATION_LANDSCAPE)
+            handleOrientationChange(Configuration.ORIENTATION_LANDSCAPE)
         }
     }
 
@@ -151,16 +151,19 @@ class DoubleTapPlayerView @JvmOverloads constructor(
         }
     }
 
-    override fun onConfigurationChanged(newConfig: Configuration) {
+    private fun handleOrientationChange(orientation: Int) {
-        super.onConfigurationChanged(newConfig)
         val centerControls = findViewById<LinearLayout>(R.id.exo_center_controls)
         (centerControls.parent as ViewGroup).removeView(centerControls)
-        findViewById<FrameLayout>(
+        findViewById<FrameLayout>(if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
-            if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE)
+            R.id.center_controls_bar
-                R.id.center_controls_bar
+        } else {
-            else
+            R.id.center_controls_external
-                R.id.center_controls_external
+        }).addView(centerControls)
-        ).addView(centerControls)
+        updateButtonSize(orientation)
-        updateButtonSize(newConfig.orientation)
+    }
+
+    override fun onConfigurationChanged(newConfig: Configuration) {
+        super.onConfigurationChanged(newConfig)
+        handleOrientationChange(newConfig.orientation)
     }
 }

app/src/main/java/sushi/hardcore/droidfs/widgets/EditTextDialog.kt

@@ -10,7 +10,7 @@ class EditTextDialog(
     activity: BaseActivity,
     private val titleId: Int,
     private val callback: (String) -> Unit,
-): CustomAlertDialogBuilder(activity, activity.themeValue) {
+): CustomAlertDialogBuilder(activity, activity.theme) {
     val binding = DialogEditTextBinding.inflate(activity.layoutInflater)
 
     fun setSelectedText(text: CharSequence) {

app/src/main/native/gocryptfs_jni.c

@@ -1,37 +1,14 @@
 #include <jni.h>
-#include <stdio.h>
 #include <malloc.h>
 #include <string.h>
-#include <sys/stat.h>
 #include "libgocryptfs.h"
 
-void wipe(char* data, const unsigned int len){
+const int KeyLen = 32;
-    for (unsigned int i=0; i<len;++i){
-        data[i] = '\0';
-    }
-}
 
-void jcharArray_to_charArray(const jchar* src, char* dst, const unsigned int len){
+JNIEXPORT jint JNICALL
-    for (unsigned int i=0; i<len; ++i){
+Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_00024Companion_nativeCreateVolume(JNIEnv *env, jclass clazz,
-        dst[i] = src[i];
+                                                                             jstring jroot_cipher_dir,
-    }
+                                                                             jbyteArray jpassword,
-}
-
-void unsignedCharArray_to_jbyteArray(const unsigned char* src, jbyte* dst, const unsigned int len){
-    for (unsigned int i=0; i<len; ++i){
-        dst[i] = src[i];
-    }
-}
-
-void jbyteArray_to_unsignedCharArray(const jbyte* src, unsigned char* dst, const unsigned int len){
-    for (unsigned int i=0; i<len; ++i){
-        dst[i] = src[i];
-    }
-}
-
-JNIEXPORT jboolean JNICALL
-Java_sushi_hardcore_droidfs_GocryptfsVolume_00024Companion_createVolume(JNIEnv *env, jclass clazz,
-                                                                             jstring jroot_cipher_dir, jcharArray jpassword,
                                                                              jboolean plainTextNames,
                                                                              jint xchacha,
                                                                              jint logN,
@@ -41,85 +18,82 @@ Java_sushi_hardcore_droidfs_GocryptfsVolume_00024Companion_createVolume(JNIEnv *
     const char* creator = (*env)->GetStringUTFChars(env, jcreator, NULL);
     GoString gofilename = {root_cipher_dir, strlen(root_cipher_dir)}, gocreator = {creator, strlen(creator)};
 
-    const size_t password_len = (*env)->GetArrayLength(env, jpassword);
+    const size_t password_len = (const size_t) (*env)->GetArrayLength(env, jpassword);
-    jchar* jchar_password = (*env)->GetCharArrayElements(env, jpassword, NULL);
+    jbyte* password = (*env)->GetByteArrayElements(env, jpassword, NULL);
-    char password[password_len];
-    jcharArray_to_charArray(jchar_password, password, password_len);
     GoSlice go_password = {password, password_len, password_len};
 
     size_t returned_hash_len;
-    jbyte* jbyte_returned_hash;
+    GoSlice go_returned_hash;
-    unsigned char* returned_hash;
-    GoSlice go_returned_hash = {NULL, 0, 0};
     if (!(*env)->IsSameObject(env, jreturned_hash, NULL)) {
-        returned_hash_len = (*env)->GetArrayLength(env, jreturned_hash);
+        returned_hash_len = (size_t) (*env)->GetArrayLength(env, jreturned_hash);
-        jbyte_returned_hash = (*env)->GetByteArrayElements(env, jreturned_hash, NULL);
+        go_returned_hash.data = (*env)->GetByteArrayElements(env, jreturned_hash, NULL);
-        returned_hash = malloc(returned_hash_len);
+    } else {
-        go_returned_hash.data = returned_hash;
+        returned_hash_len = KeyLen;
-        go_returned_hash.len = returned_hash_len;
+        go_returned_hash.data = malloc(KeyLen);
-        go_returned_hash.cap = returned_hash_len;
     }
+    go_returned_hash.len = returned_hash_len;
+    go_returned_hash.cap = returned_hash_len;
 
-    GoUint8 result = gcf_create_volume(gofilename, go_password, plainTextNames, xchacha, logN, gocreator, go_returned_hash);
+    GoUint8 result = gcf_create_volume(gofilename, go_password, plainTextNames, (GoInt8) xchacha, logN, gocreator, go_returned_hash);
+
+    (*env)->ReleaseByteArrayElements(env, jpassword, password, 0);
+    (*env)->ReleaseStringUTFChars(env, jcreator, creator);
+
+    GoInt sessionID = -2;
+    if (result) {
+        GoSlice null_slice = {NULL, 0, 0};
+        sessionID = gcf_init(gofilename, null_slice, go_returned_hash, null_slice);
+    }
 
     (*env)->ReleaseStringUTFChars(env, jroot_cipher_dir, root_cipher_dir);
-    (*env)->ReleaseStringUTFChars(env, jcreator, creator);
-    wipe(password, password_len);
-    (*env)->ReleaseCharArrayElements(env, jpassword, jchar_password, 0);
 
     if (!(*env)->IsSameObject(env, jreturned_hash, NULL)) {
-        unsignedCharArray_to_jbyteArray(returned_hash, jbyte_returned_hash, returned_hash_len);
+        (*env)->ReleaseByteArrayElements(env, jreturned_hash, go_returned_hash.data, 0);
-        wipe(returned_hash, returned_hash_len);
+    } else {
-        free(returned_hash);
+        for (unsigned int i=0; i<returned_hash_len; ++i) {
-        (*env)->ReleaseByteArrayElements(env, jreturned_hash, jbyte_returned_hash, 0);
+            ((unsigned char*) go_returned_hash.data)[i] = 0;
+        }
+        free(go_returned_hash.data);
     }
 
-    return result;
+    return sessionID;
 }
 
 JNIEXPORT jint JNICALL
-Java_sushi_hardcore_droidfs_GocryptfsVolume_00024Companion_init(JNIEnv *env, jobject clazz,
+Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_00024Companion_nativeInit(JNIEnv *env, jobject clazz,
                                                       jstring jroot_cipher_dir,
-                                                      jcharArray jpassword,
+                                                      jbyteArray jpassword,
                                                       jbyteArray jgiven_hash,
                                                       jbyteArray jreturned_hash) {
     const char* root_cipher_dir = (*env)->GetStringUTFChars(env, jroot_cipher_dir, NULL);
     GoString go_root_cipher_dir = {root_cipher_dir, strlen(root_cipher_dir)};
 
     size_t password_len;
-    jchar* jchar_password;
+    jbyte* password;
-    char* password;
     GoSlice go_password = {NULL, 0, 0};
     size_t given_hash_len;
-    jbyte* jbyte_given_hash;
+    jbyte* given_hash;
-    unsigned char* given_hash;
     GoSlice go_given_hash = {NULL, 0, 0};
     if ((*env)->IsSameObject(env, jgiven_hash, NULL)){
-        password_len = (*env)->GetArrayLength(env, jpassword);
+        password_len = (size_t) (*env)->GetArrayLength(env, jpassword);
-        jchar_password = (*env)->GetCharArrayElements(env, jpassword, NULL);
+        password = (*env)->GetByteArrayElements(env, jpassword, NULL);
-        password = malloc(password_len);
-        jcharArray_to_charArray(jchar_password, password, password_len);
         go_password.data = password;
         go_password.len = password_len;
         go_password.cap = password_len;
     } else {
-        given_hash_len = (*env)->GetArrayLength(env, jgiven_hash);
+        given_hash_len = (size_t) (*env)->GetArrayLength(env, jgiven_hash);
-        jbyte_given_hash = (*env)->GetByteArrayElements(env, jgiven_hash, NULL);
+        given_hash = (*env)->GetByteArrayElements(env, jgiven_hash, NULL);
-        given_hash = malloc(given_hash_len);
-        jbyteArray_to_unsignedCharArray(jbyte_given_hash, given_hash, given_hash_len);
         go_given_hash.data = given_hash;
         go_given_hash.len = given_hash_len;
         go_given_hash.cap = given_hash_len;
     }
 
     size_t returned_hash_len;
-    jbyte* jbyte_returned_hash;
+    jbyte* returned_hash;
-    unsigned char* returned_hash;
     GoSlice go_returned_hash = {NULL, 0, 0};
     if (!(*env)->IsSameObject(env, jreturned_hash, NULL)){
-        returned_hash_len = (*env)->GetArrayLength(env, jreturned_hash);
+        returned_hash_len = (size_t) (*env)->GetArrayLength(env, jreturned_hash);
-        jbyte_returned_hash = (*env)->GetByteArrayElements(env, jreturned_hash, NULL);
+        returned_hash = (*env)->GetByteArrayElements(env, jreturned_hash, NULL);
-        returned_hash = malloc(returned_hash_len);
         go_returned_hash.data = returned_hash;
         go_returned_hash.len = returned_hash_len;
         go_returned_hash.cap = returned_hash_len;
@@ -130,81 +104,64 @@ Java_sushi_hardcore_droidfs_GocryptfsVolume_00024Companion_init(JNIEnv *env, job
     (*env)->ReleaseStringUTFChars(env, jroot_cipher_dir, root_cipher_dir);
 
     if ((*env)->IsSameObject(env, jgiven_hash, NULL)){
-        wipe(password, password_len);
+        (*env)->ReleaseByteArrayElements(env, jpassword, password, 0);
-        free(password);
-        (*env)->ReleaseCharArrayElements(env, jpassword, jchar_password, 0);
     } else {
-        wipe(given_hash, given_hash_len);
+        (*env)->ReleaseByteArrayElements(env, jgiven_hash, given_hash, 0);
-        free(given_hash);
-        (*env)->ReleaseByteArrayElements(env, jgiven_hash, jbyte_given_hash, 0);
     }
 
     if (!(*env)->IsSameObject(env, jreturned_hash, NULL)){
-        unsignedCharArray_to_jbyteArray(returned_hash, jbyte_returned_hash, returned_hash_len);
+        (*env)->ReleaseByteArrayElements(env, jreturned_hash, returned_hash, 0);
-        wipe(returned_hash, returned_hash_len);
-        free(returned_hash);
-        (*env)->ReleaseByteArrayElements(env, jreturned_hash, jbyte_returned_hash, 0);
     }
 
     return sessionID;
 }
 
 JNIEXPORT jboolean JNICALL
-Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1is_1closed(JNIEnv *env, jobject thiz,
+Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_native_1is_1closed(JNIEnv *env, jobject thiz,
                                                                     jint sessionID) {
     return gcf_is_closed(sessionID);
 }
 
 JNIEXPORT jboolean JNICALL
-Java_sushi_hardcore_droidfs_GocryptfsVolume_00024Companion_changePassword(JNIEnv *env, jclass clazz,
+Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_00024Companion_changePassword(JNIEnv *env, jclass clazz,
                                                                                jstring jroot_cipher_dir,
-                                                                               jcharArray jold_password,
+                                                                               jbyteArray jold_password,
                                                                                jbyteArray jgiven_hash,
-                                                                               jcharArray jnew_password,
+                                                                               jbyteArray jnew_password,
                                                                                jbyteArray jreturned_hash) {
     const char* root_cipher_dir = (*env)->GetStringUTFChars(env, jroot_cipher_dir, NULL);
     GoString go_root_cipher_dir = {root_cipher_dir, strlen(root_cipher_dir)};
 
     size_t old_password_len;
-    jchar* jchar_old_password;
+    jbyte* old_password;
-    char* old_password;
     GoSlice go_old_password = {NULL, 0, 0};
     size_t given_hash_len;
-    jbyte* jbyte_given_hash;
+    jbyte* given_hash;
-    unsigned char* given_hash;
     GoSlice go_given_hash = {NULL, 0, 0};
     if ((*env)->IsSameObject(env, jgiven_hash, NULL)){
-        old_password_len = (*env)->GetArrayLength(env, jold_password);
+        old_password_len = (size_t) (*env)->GetArrayLength(env, jold_password);
-        jchar_old_password = (*env)->GetCharArrayElements(env, jold_password, NULL);
+        old_password = (*env)->GetByteArrayElements(env, jold_password, NULL);
-        old_password = malloc(old_password_len);
-        jcharArray_to_charArray(jchar_old_password, old_password, old_password_len);
         go_old_password.data = old_password;
         go_old_password.len = old_password_len;
         go_old_password.cap = old_password_len;
     } else {
-        given_hash_len = (*env)->GetArrayLength(env, jgiven_hash);
+        given_hash_len = (size_t) (*env)->GetArrayLength(env, jgiven_hash);
-        jbyte_given_hash = (*env)->GetByteArrayElements(env, jgiven_hash, NULL);
+        given_hash = (*env)->GetByteArrayElements(env, jgiven_hash, NULL);
-        given_hash = malloc(given_hash_len);
-        jbyteArray_to_unsignedCharArray(jbyte_given_hash, given_hash, given_hash_len);
         go_given_hash.data = given_hash;
         go_given_hash.len = given_hash_len;
         go_given_hash.cap = given_hash_len;
     }
 
-    size_t new_password_len = (*env)->GetArrayLength(env, jnew_password);
+    size_t new_password_len = (size_t) (*env)->GetArrayLength(env, jnew_password);
-    jchar* jchar_new_password = (*env)->GetCharArrayElements(env, jnew_password, NULL);
+    jbyte* new_password = (*env)->GetByteArrayElements(env, jnew_password, NULL);
-    char* new_password = malloc(new_password_len);
-    jcharArray_to_charArray(jchar_new_password, new_password, new_password_len);
     GoSlice go_new_password = {new_password, new_password_len, new_password_len};
 
     size_t returned_hash_len;
-    jbyte* jbyte_returned_hash;
+    jbyte* returned_hash;
-    unsigned char* returned_hash;
     GoSlice go_returned_hash = {NULL, 0, 0};
     if (!(*env)->IsSameObject(env, jreturned_hash, NULL)) {
-        returned_hash_len = (*env)->GetArrayLength(env, jreturned_hash);
+        returned_hash_len = (size_t) (*env)->GetArrayLength(env, jreturned_hash);
-        jbyte_returned_hash = (*env)->GetByteArrayElements(env, jreturned_hash, NULL);
+        returned_hash = (*env)->GetByteArrayElements(env, jreturned_hash, NULL);
-        returned_hash = malloc(returned_hash_len);
         go_returned_hash.data = returned_hash;
         go_returned_hash.len = returned_hash_len;
         go_returned_hash.cap = returned_hash_len;
@@ -215,35 +172,27 @@ Java_sushi_hardcore_droidfs_GocryptfsVolume_00024Companion_changePassword(JNIEnv
     (*env)->ReleaseStringUTFChars(env, jroot_cipher_dir, root_cipher_dir);
 
     if ((*env)->IsSameObject(env, jgiven_hash, NULL)){
-        wipe(old_password, old_password_len);
+        (*env)->ReleaseByteArrayElements(env, jold_password, old_password, 0);
-        free(old_password);
-        (*env)->ReleaseCharArrayElements(env, jold_password, jchar_old_password, 0);
     } else {
-        wipe(given_hash, given_hash_len);
+        (*env)->ReleaseByteArrayElements(env, jgiven_hash, given_hash, 0);
-        free(given_hash);
-        (*env)->ReleaseByteArrayElements(env, jgiven_hash, jbyte_given_hash, 0);
     }
 
-    wipe(new_password, new_password_len);
+    (*env)->ReleaseByteArrayElements(env, jnew_password, new_password, 0);
-    (*env)->ReleaseCharArrayElements(env, jnew_password, jchar_new_password, 0);
 
     if (!(*env)->IsSameObject(env, jreturned_hash, NULL)) {
-        unsignedCharArray_to_jbyteArray(returned_hash, jbyte_returned_hash, returned_hash_len);
+        (*env)->ReleaseByteArrayElements(env, jreturned_hash, returned_hash, 0);
-        wipe(returned_hash, returned_hash_len);
-        free(returned_hash);
-        (*env)->ReleaseByteArrayElements(env, jreturned_hash, jbyte_returned_hash, 0);
     }
 
     return result;
 }
 
 JNIEXPORT void JNICALL
-Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1close(JNIEnv *env, jobject thiz, jint sessionID) {
+Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_native_1close(JNIEnv *env, jobject thiz, jint sessionID) {
     gcf_close(sessionID);
 }
 
 JNIEXPORT jobject JNICALL
-Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1list_1dir(JNIEnv *env, jobject thiz,
+Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_native_1list_1dir(JNIEnv *env, jobject thiz,
                                                           jint sessionID, jstring jplain_dir) {
     const char* plain_dir = (*env)->GetStringUTFChars(env, jplain_dir, NULL);
     const size_t plain_dir_len = strlen(plain_dir);
@@ -251,51 +200,59 @@ Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1list_1dir(JNIEnv *env, jobje
 
     struct gcf_list_dir_return elements = gcf_list_dir(sessionID, go_plain_dir);
 
-    jclass java_ArrayList = (*env)->NewLocalRef(env, (*env)->FindClass(env, "java/util/ArrayList"));
+    jobject elementList = NULL;
-    jmethodID java_ArrayList_init = (*env)->GetMethodID(env, java_ArrayList, "<init>", "(I)V");
+    if (elements.r0 != NULL) {
-    jmethodID java_ArrayList_add = (*env)->GetMethodID(env, java_ArrayList, "add", "(Ljava/lang/Object;)Z");
+        jclass arrayList = (*env)->NewLocalRef(env, (*env)->FindClass(env, "java/util/ArrayList"));
+        jmethodID arrayListInit = (*env)->GetMethodID(env, arrayList, "<init>", "(I)V");
+        jmethodID arrayListAdd = (*env)->GetMethodID(env, arrayList, "add", "(Ljava/lang/Object;)Z");
+        jclass classExplorerElement = (*env)->NewLocalRef(env, (*env)->FindClass(env, "sushi/hardcore/droidfs/explorers/ExplorerElement"));
+        jmethodID explorerElementNew = (*env)->GetStaticMethodID(env, classExplorerElement, "new", "(Ljava/lang/String;IJJLjava/lang/String;)Lsushi/hardcore/droidfs/explorers/ExplorerElement;");
+        elementList = (*env)->NewObject(env, arrayList, arrayListInit, elements.r2);
 
-    jclass classExplorerElement = (*env)->NewLocalRef(env, (*env)->FindClass(env, "sushi/hardcore/droidfs/explorers/ExplorerElement"));
+        unsigned int c = 0;
-    jmethodID explorerElement_new = (*env)->GetStaticMethodID(env, classExplorerElement, "new", "(Ljava/lang/String;SJJLjava/lang/String;)Lsushi/hardcore/droidfs/explorers/ExplorerElement;");
+        for (unsigned int i=0; i<elements.r2; ++i) {
-    jobject element_list = (*env)->NewObject(env, java_ArrayList, java_ArrayList_init, elements.r2);
+            const char* name = &(elements.r0[c]);
-    unsigned int c = 0;
+            size_t nameLen = strlen(name);
-    for (unsigned int i=0; i<elements.r2; ++i){
-        const char* name = &(elements.r0[c]);
-        size_t name_len = strlen(name);
 
-        const char gcf_full_path[plain_dir_len+name_len+2];
+            char* fullPath = malloc(sizeof(char) * (plain_dir_len + nameLen + 2));
-        if (plain_dir_len > 0){
+            strcpy(fullPath, plain_dir);
-            strcpy(gcf_full_path, plain_dir);
             if (plain_dir[-2] != '/') {
-                strcat(gcf_full_path, "/");
+                strcat(fullPath, "/");
             }
-            strcat(gcf_full_path, name);
+            strcat(fullPath, name);
-        } else {
+
-            strcpy(gcf_full_path, name);
+            GoString go_name = {fullPath, strlen(fullPath)};
+            struct gcf_get_attrs_return attrs = gcf_get_attrs(sessionID, go_name);
+            free(fullPath);
+
+            jstring jname = (*env)->NewStringUTF(env, name);
+            jobject explorerElement = (*env)->CallStaticObjectMethod(
+                    env,
+                    classExplorerElement,
+                    explorerElementNew,
+                    jname,
+                    elements.r1[i],
+                    (long long) attrs.r1,
+                    (long long) attrs.r2,
+                    jplain_dir
+            );
+            (*env)->CallBooleanMethod(env, elementList, arrayListAdd, explorerElement);
+            (*env)->DeleteLocalRef(env, explorerElement);
+            (*env)->DeleteLocalRef(env, jname);
+            c += nameLen + 1;
         }
 
-        GoString go_name = {gcf_full_path, strlen(gcf_full_path)};
+        free(elements.r0);
-        struct gcf_get_attrs_return attrs = gcf_get_attrs(sessionID, go_name);
+        free(elements.r1);
-
-        short type = 0; //directory
-        if (S_ISREG(elements.r1[i])){
-            type = 1; //regular file
-        }
-        jstring jname = (*env)->NewStringUTF(env, name);
-        jobject explorerElement = (*env)->CallStaticObjectMethod(env, classExplorerElement, explorerElement_new, jname, type, (long long)attrs.r0, attrs.r1, jplain_dir);(*env)->CallBooleanMethod(env, element_list, java_ArrayList_add, explorerElement);
-        c += name_len+1;
     }
 
-    free(elements.r0);
-    free(elements.r1);
-
     (*env)->ReleaseStringUTFChars(env, jplain_dir, plain_dir);
 
-    return element_list;
+    return elementList;
 }
 
-JNIEXPORT jlong JNICALL
+JNIEXPORT jobject JNICALL
-Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1get_1size(JNIEnv *env, jobject thiz,
+Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_native_1get_1attr(JNIEnv *env, jobject thiz,
                                                               jint sessionID, jstring jfile_path) {
     const char* file_path = (*env)->GetStringUTFChars(env, jfile_path, NULL);
     GoString go_file_path = {file_path, strlen(file_path)};
@@ -304,25 +261,22 @@ Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1get_1size(JNIEnv *env, jobje
 
     (*env)->ReleaseStringUTFChars(env, jfile_path, file_path);
 
-    return attrs.r0;
+    if (attrs.r3 == 1) {
-}
+        jclass stat = (*env)->FindClass(env, "sushi/hardcore/droidfs/filesystems/Stat");
-
+        jmethodID statInit = (*env)->GetMethodID(env, stat, "<init>", "(IJJ)V");
-JNIEXPORT jboolean JNICALL
+        return (*env)->NewObject(
-Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1path_1exists(JNIEnv *env, jobject thiz,
+                env, stat, statInit,
-                                                                     jint sessionID,
+                (jint)attrs.r0,
-                                                                     jstring jfile_path) {
+                (jlong)attrs.r1,
-    const char* file_path = (*env)->GetStringUTFChars(env, jfile_path, NULL);
+                (jlong)attrs.r2
-    GoString go_file_path = {file_path, strlen(file_path)};
+        );
-
+    } else {
-    struct gcf_get_attrs_return attrs = gcf_get_attrs(sessionID, go_file_path);
+        return NULL;
-
+    }
-    (*env)->ReleaseStringUTFChars(env, jfile_path, file_path);
-
-    return attrs.r1 != 0;
 }
 
 JNIEXPORT jint JNICALL
-Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1open_1read_1mode(JNIEnv *env, jobject thiz,
+Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_native_1open_1read_1mode(JNIEnv *env, jobject thiz,
                                                                          jint sessionID,
                                                                          jstring jfile_path) {
     const char* file_path = (*env)->GetStringUTFChars(env, jfile_path, NULL);
@@ -336,14 +290,14 @@ Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1open_1read_1mode(JNIEnv *env
 }
 
 JNIEXPORT jint JNICALL
-Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1open_1write_1mode(JNIEnv *env, jobject thiz,
+Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_native_1open_1write_1mode(JNIEnv *env, jobject thiz,
                                                                           jint sessionID,
                                                                           jstring jfile_path,
                                                                           jint mode) {
     const char* file_path = (*env)->GetStringUTFChars(env, jfile_path, NULL);
     GoString go_file_path = {file_path, strlen(file_path)};
 
-    GoInt handleID = gcf_open_write_mode(sessionID, go_file_path, mode);
+    GoInt handleID = gcf_open_write_mode(sessionID, go_file_path, (GoUint32) mode);
 
     (*env)->ReleaseStringUTFChars(env, jfile_path, file_path);
 
@@ -351,13 +305,13 @@ Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1open_1write_1mode(JNIEnv *en
 }
 
 JNIEXPORT jint JNICALL
-Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1write_1file(JNIEnv *env, jobject thiz,
+Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_native_1write_1file(JNIEnv *env, jobject thiz,
-                                                            jint sessionID, jint handleID, jlong offset,
+                                                            jint sessionID, jint handleID, jlong file_offset,
-                                                            jbyteArray jbuff, jint buff_size) {
+                                                            jbyteArray jbuff, jlong src_offset, jint length) {
     jbyte* buff = (*env)->GetByteArrayElements(env, jbuff, NULL);
-    GoSlice go_buff = {buff, buff_size, buff_size};
+    GoSlice go_buff = {buff+src_offset, length, length};
 
-    int written = gcf_write_file(sessionID, handleID, offset, go_buff);
+    int written = gcf_write_file(sessionID, handleID, (GoUint64) file_offset, go_buff);
 
     (*env)->ReleaseByteArrayElements(env, jbuff, buff, 0);
 
@@ -365,38 +319,41 @@ Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1write_1file(JNIEnv *env, job
 }
 
 JNIEXPORT jint JNICALL
-Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1read_1file(JNIEnv *env, jobject thiz,
+Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_native_1read_1file(JNIEnv *env, jobject thiz,
-                                                           jint sessionID, jint handleID, jlong offset,
+                                                           jint sessionID, jint handleID, jlong file_offset,
-                                                            jbyteArray jbuff) {
+                                                            jbyteArray jbuff, jlong dst_offset, jint length) {
-    const size_t buff_size = (*env)->GetArrayLength(env, jbuff);
+    jbyte* buff = (*env)->GetByteArrayElements(env, jbuff, NULL);
-    unsigned char buff[buff_size];
+    GoSlice go_buff = {buff+dst_offset, length, length};
-    GoSlice go_buff = {buff, buff_size, buff_size};
 
-    int read = gcf_read_file(sessionID, handleID, offset, go_buff);
+    int read = gcf_read_file(sessionID, handleID, (GoUint64) file_offset, go_buff);
-
-    if (read > 0){
-        (*env)->SetByteArrayRegion(env, jbuff, 0, read, buff);
-    }
 
+    (*env)->ReleaseByteArrayElements(env, jbuff, buff, 0);
     return read;
 }
 
 JNIEXPORT jboolean JNICALL
-Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1truncate(JNIEnv *env, jobject thiz,
+Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_native_1truncate(JNIEnv *env, jobject thiz,
                                                                   jint sessionID,
-                                                                  jint handleID, jlong offset) {
+                                                                  jstring jpath,
-    return gcf_truncate(sessionID, handleID, offset);
+                                                                  jlong offset) {
+    const char* path = (*env)->GetStringUTFChars(env, jpath, NULL);
+    GoString go_path = {path, strlen(path)};
+
+    GoUint8 result = gcf_truncate(sessionID, go_path, (GoUint64) offset);
+
+    (*env)->ReleaseStringUTFChars(env, jpath, path);
+    return result;
 }
 
 JNIEXPORT void JNICALL
-Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1close_1file(JNIEnv *env, jobject thiz,
+Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_native_1close_1file(JNIEnv *env, jobject thiz,
                                                                          jint sessionID,
                                                                          jint handleID) {
     gcf_close_file(sessionID, handleID);
 }
 
 JNIEXPORT jboolean JNICALL
-Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1remove_1file(JNIEnv *env, jobject thiz,
+Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_native_1remove_1file(JNIEnv *env, jobject thiz,
                                                                      jint sessionID, jstring jfile_path) {
     const char* file_path = (*env)->GetStringUTFChars(env, jfile_path, NULL);
     GoString go_file_path = {file_path, strlen(file_path)};
@@ -409,12 +366,12 @@ Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1remove_1file(JNIEnv *env, jo
 }
 
 JNIEXPORT jboolean JNICALL
-Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1mkdir(JNIEnv *env, jobject thiz,
+Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_native_1mkdir(JNIEnv *env, jobject thiz,
                                                       jint sessionID, jstring jdir_path, jint mode) {
     const char* dir_path = (*env)->GetStringUTFChars(env, jdir_path, NULL);
     GoString go_dir_path = {dir_path, strlen(dir_path)};
 
-    GoUint8 result = gcf_mkdir(sessionID, go_dir_path, mode);
+    GoUint8 result = gcf_mkdir(sessionID, go_dir_path, (GoUint32) mode);
 
     (*env)->ReleaseStringUTFChars(env, jdir_path, dir_path);
 
@@ -422,7 +379,7 @@ Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1mkdir(JNIEnv *env, jobject t
 }
 
 JNIEXPORT jboolean JNICALL
-Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1rmdir(JNIEnv *env, jobject thiz,
+Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_native_1rmdir(JNIEnv *env, jobject thiz,
                                                       jint sessionID, jstring jdir_path) {
     const char* dir_path = (*env)->GetStringUTFChars(env, jdir_path, NULL);
     GoString go_dir_path = {dir_path, strlen(dir_path)};
@@ -435,7 +392,7 @@ Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1rmdir(JNIEnv *env, jobject t
 }
 
 JNIEXPORT jboolean JNICALL
-Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1rename(JNIEnv *env, jobject thiz,
+Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_native_1rename(JNIEnv *env, jobject thiz,
                                                                 jint sessionID, jstring jold_path,
                                                                 jstring jnew_path) {
     const char* old_path = (*env)->GetStringUTFChars(env, jold_path, NULL);
@@ -449,4 +406,4 @@ Java_sushi_hardcore_droidfs_GocryptfsVolume_native_1rename(JNIEnv *env, jobject
     (*env)->ReleaseStringUTFChars(env, jnew_path, new_path);
 
     return result;
-}
+}

app/src/main/native/libcryfs.c

@@ -0,0 +1,200 @@
+#include <sys/stat.h>
+#include <jni.h>
+#include <libcryfs-jni.h>
+
+JNIEXPORT jlong JNICALL
+Java_sushi_hardcore_droidfs_filesystems_CryfsVolume_00024Companion_nativeInit(JNIEnv *env, jobject thiz,
+                                                               jstring base_dir, jstring jlocalStateDir,
+                                                               jbyteArray password, jbyteArray givenHash,
+                                                               jobject returnedHash,
+                                                               jboolean createBaseDir, jstring cipher,
+                                                               jobject jerrorCode) {
+    return cryfs_init(env, base_dir, jlocalStateDir, password, givenHash, returnedHash, createBaseDir, cipher, jerrorCode);
+}
+
+JNIEXPORT jboolean JNICALL
+Java_sushi_hardcore_droidfs_filesystems_CryfsVolume_00024Companion_nativeChangeEncryptionKey(
+        JNIEnv *env, jobject thiz, jstring base_dir, jstring local_state_dir,
+        jbyteArray current_password, jbyteArray given_hash, jbyteArray new_password,
+        jobject returned_hash) {
+    return cryfs_change_encryption_key(env, base_dir, local_state_dir, current_password, given_hash, new_password, returned_hash);
+}
+
+JNIEXPORT jlong JNICALL
+Java_sushi_hardcore_droidfs_filesystems_CryfsVolume_00024Companion_nativeCreate(JNIEnv *env, jobject thiz,
+                                                                              jlong fuse_ptr, jstring path,
+                                                                              jint mode) {
+    return cryfs_create(env, fuse_ptr, path, mode);
+}
+
+JNIEXPORT jlong JNICALL
+Java_sushi_hardcore_droidfs_filesystems_CryfsVolume_00024Companion_nativeOpen(JNIEnv *env, jobject thiz,
+                                                               jlong fuse_ptr, jstring path,
+                                                               jint flags) {
+    return cryfs_open(env, fuse_ptr, path, flags);
+}
+
+JNIEXPORT jint JNICALL
+Java_sushi_hardcore_droidfs_filesystems_CryfsVolume_00024Companion_nativeRead(JNIEnv *env,
+                                                                              jobject thiz,
+                                                                              jlong fuse_ptr,
+                                                                              jlong file_handle,
+                                                                              jlong file_offset,
+                                                                              jbyteArray buffer,
+                                                                              jlong dst_offset,
+                                                                              jlong length) {
+    return cryfs_read(env, fuse_ptr, file_handle, file_offset, buffer, dst_offset, length);
+}
+
+JNIEXPORT jint JNICALL
+Java_sushi_hardcore_droidfs_filesystems_CryfsVolume_00024Companion_nativeWrite(JNIEnv *env,
+                                                                               jobject thiz,
+                                                                               jlong fuse_ptr,
+                                                                               jlong file_handle,
+                                                                               jlong file_offset,
+                                                                               jbyteArray buffer,
+                                                                               jlong src_offset,
+                                                                               jlong length) {
+    return cryfs_write(env, fuse_ptr, file_handle, file_offset, buffer, src_offset, length);
+}
+
+JNIEXPORT jboolean JNICALL
+Java_sushi_hardcore_droidfs_filesystems_CryfsVolume_00024Companion_nativeTruncate(JNIEnv *env,
+                                                                                  jobject thiz,
+                                                                                  jlong fuse_ptr,
+                                                                                  jstring path,
+                                                                                  jlong size) {
+    return cryfs_truncate(env, fuse_ptr, path, size) == 0;
+}
+
+JNIEXPORT jboolean JNICALL
+Java_sushi_hardcore_droidfs_filesystems_CryfsVolume_00024Companion_nativeDeleteFile(JNIEnv *env,
+                                                                                    jobject thiz,
+                                                                                    jlong fuse_ptr,
+                                                                                    jstring path) {
+    return cryfs_unlink(env, fuse_ptr, path) == 0;
+}
+
+JNIEXPORT jboolean JNICALL
+Java_sushi_hardcore_droidfs_filesystems_CryfsVolume_00024Companion_nativeCloseFile(JNIEnv *env,
+                                                                                   jobject thiz,
+                                                                                   jlong fuse_ptr,
+                                                                                   jlong file_handle) {
+    return cryfs_release(fuse_ptr, file_handle) == 0;
+}
+
+struct readDirHelper {
+    JNIEnv* env;
+    jclass explorerElement;
+    jmethodID explorerElementNew;
+    jmethodID arrayListAdd;
+    jobject elementList;
+    jstring jparentPath;
+};
+
+int readDir(void* data, const char* name, const struct stat* stat) {
+    struct readDirHelper* helper = (struct readDirHelper*)data;
+    jstring jname = (*helper->env)->NewStringUTF(helper->env, name);
+    jobject explorerElement = (*helper->env)->CallStaticObjectMethod(
+            helper->env,
+            helper->explorerElement,
+            helper->explorerElementNew,
+            jname,
+            stat->st_mode,
+            stat->st_size,
+            stat->st_mtim.tv_sec,
+            helper->jparentPath
+    );
+    (*helper->env)->CallBooleanMethod(helper->env, helper->elementList, helper->arrayListAdd, explorerElement);
+    (*helper->env)->DeleteLocalRef(helper->env, explorerElement);
+    (*helper->env)->DeleteLocalRef(helper->env, jname);
+    return 0;
+}
+
+JNIEXPORT jobject JNICALL
+Java_sushi_hardcore_droidfs_filesystems_CryfsVolume_00024Companion_nativeReadDir(JNIEnv *env,
+                                                                                 jobject thiz,
+                                                                                 jlong fuse_ptr,
+                                                                                 jstring path) {
+    jclass arrayList = (*env)->NewLocalRef(env, (*env)->FindClass(env, "java/util/ArrayList"));
+    jmethodID arrayListInit = (*env)->GetMethodID(env, arrayList, "<init>", "()V");
+    struct readDirHelper helper;
+    helper.env = env;
+    helper.explorerElement = (*env)->NewLocalRef(env, (*env)->FindClass(env, "sushi/hardcore/droidfs/explorers/ExplorerElement"));
+    helper.explorerElementNew = (*env)->GetStaticMethodID(
+            env, helper.explorerElement, "new",
+            "(Ljava/lang/String;IJJLjava/lang/String;)Lsushi/hardcore/droidfs/explorers/ExplorerElement;"
+    );
+    helper.arrayListAdd = (*env)->GetMethodID(env, arrayList, "add", "(Ljava/lang/Object;)Z");
+    helper.elementList = (*env)->NewObject(env, arrayList, arrayListInit);
+    helper.jparentPath = path;
+
+    int result = cryfs_readdir(env, fuse_ptr, path, &helper, readDir);
+
+    if (result == 0) {
+        return helper.elementList;
+    } else {
+        return NULL;
+    }
+}
+
+JNIEXPORT jboolean JNICALL
+Java_sushi_hardcore_droidfs_filesystems_CryfsVolume_00024Companion_nativeMkdir(JNIEnv *env,
+                                                                               jobject thiz,
+                                                                               jlong fuse_ptr,
+                                                                               jstring path,
+                                                                               jint mode) {
+    return cryfs_mkdir(env, fuse_ptr, path, mode) == 0;
+}
+
+JNIEXPORT jboolean JNICALL
+Java_sushi_hardcore_droidfs_filesystems_CryfsVolume_00024Companion_nativeRmdir(JNIEnv *env,
+                                                                               jobject thiz,
+                                                                               jlong fuse_ptr,
+                                                                               jstring path) {
+    return cryfs_rmdir(env, fuse_ptr, path) == 0;
+}
+
+JNIEXPORT jobject JNICALL
+Java_sushi_hardcore_droidfs_filesystems_CryfsVolume_00024Companion_nativeGetAttr(JNIEnv *env,
+                                                                                 jobject thiz,
+                                                                                 jlong fuse_ptr,
+                                                                                 jstring path) {
+    struct stat stbuf;
+    int result = cryfs_getattr(env, fuse_ptr, path, &stbuf);
+    if (result == 0) {
+        jclass stat = (*env)->FindClass(env, "sushi/hardcore/droidfs/filesystems/Stat");
+        jmethodID statInit = (*env)->GetMethodID(env, stat, "<init>", "(IJJ)V");
+        return (*env)->NewObject(
+            env, stat, statInit,
+            (jint)stbuf.st_mode,
+            (jlong)stbuf.st_size,
+            (jlong)stbuf.st_mtim.tv_sec
+        );
+    } else {
+        return NULL;
+    }
+}
+
+JNIEXPORT jboolean JNICALL
+Java_sushi_hardcore_droidfs_filesystems_CryfsVolume_00024Companion_nativeRename(JNIEnv *env,
+                                                                                jobject thiz,
+                                                                                jlong fuse_ptr,
+                                                                                jstring src_path,
+                                                                                jstring dst_path) {
+    return cryfs_rename(env, fuse_ptr, src_path, dst_path) == 0;
+}
+
+JNIEXPORT void JNICALL
+Java_sushi_hardcore_droidfs_filesystems_CryfsVolume_00024Companion_nativeClose(JNIEnv *env,
+                                                                               jobject thiz,
+                                                                               jlong fuse_ptr) {
+    cryfs_destroy(fuse_ptr);
+}
+
+JNIEXPORT jboolean JNICALL
+Java_sushi_hardcore_droidfs_filesystems_CryfsVolume_00024Companion_nativeIsClosed(JNIEnv *env,
+                                                                               jobject thiz,
+                                                                               jlong fuse_ptr) {
+    return cryfs_is_closed(fuse_ptr);
+}