105 lines
2.9 KiB
C++
105 lines
2.9 KiB
C++
#include "DirBlob.h"
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#include <cassert>
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//TODO Remove and replace with exception hierarchy
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#include "messmer/fspp/fuse/FuseErrnoException.h"
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#include <messmer/blockstore/utils/Data.h>
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#include "MagicNumbers.h"
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using std::unique_ptr;
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using std::make_unique;
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using std::vector;
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using std::string;
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using blobstore::Blob;
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using blockstore::Key;
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using blockstore::Data;
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//TODO Refactor: Keep a parsed dir structure (list of entries and blob keys they're pointing to) in memory and serialize/deserialize it
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namespace cryfs {
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DirBlob::DirBlob(unique_ptr<Blob> blob)
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: _blob(std::move(blob)) {
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}
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DirBlob::~DirBlob() {
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}
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void DirBlob::InitializeEmptyDir() {
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_blob->resize(1);
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unsigned char magicNumber = MagicNumbers::DIR;
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_blob->write(&magicNumber, 0, 1);
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}
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unsigned char DirBlob::magicNumber() const {
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return magicNumber(*_blob);
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}
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const unsigned char DirBlob::magicNumber(const blobstore::Blob &blob) {
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unsigned char number;
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blob.read(&number, 0, 1);
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return number;
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}
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bool DirBlob::IsDir(const blobstore::Blob &blob) {
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return magicNumber(blob) == MagicNumbers::DIR;
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}
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unique_ptr<vector<string>> DirBlob::GetChildren() const {
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Data entries(_blob->size()-1);
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_blob->read(entries.data(), 1, _blob->size()-1);
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auto result = make_unique<vector<string>>();
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const char *pos = (const char*)entries.data();
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while(pos < (const char*)entries.data()+entries.size()) {
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pos = readAndAddNextChild(pos, result.get());
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}
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return result;
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}
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const char *DirBlob::readAndAddNextChild(const char *pos, vector<string> *result) const {
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size_t length = strlen(pos);
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result->emplace_back(pos, length);
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const char *posAfterName = pos + length + 1;
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const char *posAfterKey = posAfterName + strlen(posAfterName) + 1;
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return posAfterKey;
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}
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void DirBlob::AddChild(const std::string &name, const Key &blobKey) {
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//TODO blob.resize(blob.size()+X) has to traverse tree twice. Better would be blob.addSize(X) which returns old size
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uint64_t oldBlobSize = _blob->size();
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string blobKeyStr = blobKey.ToString();
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_blob->resize(oldBlobSize + name.size() + 1 + blobKeyStr.size() + 1);
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//Write entry name inclusive null terminator
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_blob->write(name.c_str(), oldBlobSize, name.size()+1);
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//Write blob key inclusive null terminator
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_blob->write(blobKeyStr.c_str(), oldBlobSize + name.size() + 1, blobKeyStr.size()+1);
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}
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Key DirBlob::GetBlobKeyForName(const string &name) const {
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auto result = make_unique<vector<string>>();
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Data entries(_blob->size()-1);
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_blob->read(entries.data(), 1, _blob->size()-1);
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const char *pos = (const char*)entries.data();
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while(pos < (const char*)entries.data()+entries.size()) {
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size_t name_length = strlen(pos);
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if (name_length == name.size() && 0==std::memcmp(pos, name.c_str(), name_length)) {
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pos += strlen(pos) + 1; // Skip name
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return Key::FromString(pos); // Return key
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}
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pos += strlen(pos) + 1; // Skip name
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pos += strlen(pos) + 1; // Skip key
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}
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throw fspp::fuse::FuseErrnoException(ENOENT);
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}
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}
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