Allow creating files

src/cryfs_lib/CryDir.cpp

@@ -30,14 +30,21 @@ CryDir::~CryDir() {
 }
 
 unique_ptr<fspp::File> CryDir::createFile(const string &name, mode_t mode) {
-  throw FuseErrnoException(ENOTSUP);
+  auto child = _device->CreateBlob(0);
+  _blob->AddChild(name, child.key);
+  //TODO Di we need a return value in createDir for fspp? If not, change fspp!
+  auto fileblob = make_unique<FileBlob>(std::move(child.blob));
+  fileblob->InitializeEmptyFile();
+  return make_unique<CryFile>(std::move(fileblob));
 }
 
 unique_ptr<fspp::Dir> CryDir::createDir(const string &name, mode_t mode) {
   auto child = _device->CreateBlob(CryDevice::DIR_BLOBSIZE);
   _blob->AddChild(name, child.key);
   //TODO I don't think we need a return value in createDir for fspp. Change fspp!
-  return make_unique<CryDir>(_device, make_unique<DirBlob>(std::move(child.blob)));
+  auto dirblob = make_unique<DirBlob>(std::move(child.blob));
+  dirblob->InitializeEmptyDir();
+  return make_unique<CryDir>(_device, std::move(dirblob));
 }
 
 void CryDir::rmdir() {

src/cryfs_lib/impl/FileBlob.cpp

@@ -14,6 +14,14 @@ FileBlob::FileBlob(unique_ptr<Blob> blob)
 FileBlob::~FileBlob() {
 }
 
+void FileBlob::InitializeEmptyFile() {
+  *magicNumber() = MagicNumbers::FILE;
+}
+
+unsigned char *FileBlob::magicNumber() {
+  return const_cast<unsigned char*>(magicNumber(const_cast<const Blob&>(*_blob)));
+}
+
 const unsigned char *FileBlob::magicNumber(const blobstore::Blob &blob) {
   return (unsigned char*)blob.data();
 }

src/cryfs_lib/impl/FileBlob.h

@@ -15,9 +15,12 @@ public:
 
   static bool IsFile(const blobstore::Blob &blob);
 
+  void InitializeEmptyFile();
+
 private:
   std::unique_ptr<blobstore::Blob> _blob;
 
+  unsigned char *magicNumber();
   static const unsigned char *magicNumber(const blobstore::Blob &blob);
 };