99 lines
2.6 KiB
C++
99 lines
2.6 KiB
C++
#include <cstring>
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#include <fstream>
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#include <boost/filesystem.hpp>
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#include "FileAlreadyExistsException.h"
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#include "OnDiskBlock.h"
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#include "OnDiskBlockStore.h"
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#include "../../utils/FileDoesntExistException.h"
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using std::unique_ptr;
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using std::make_unique;
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using std::istream;
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using std::ostream;
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using std::ifstream;
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using std::ofstream;
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using std::ios;
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namespace bf = boost::filesystem;
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namespace blockstore {
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namespace ondisk {
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OnDiskBlock::OnDiskBlock(const Key &key, const bf::path &filepath, size_t size)
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: Block(key), _filepath(filepath), _data(size), _dataChanged(false) {
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}
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OnDiskBlock::OnDiskBlock(const Key &key, const bf::path &filepath, Data &&data)
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: Block(key), _filepath(filepath), _data(std::move(data)), _dataChanged(false) {
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}
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OnDiskBlock::~OnDiskBlock() {
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flush();
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}
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const void *OnDiskBlock::data() const {
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return _data.data();
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}
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void OnDiskBlock::write(const void *source, uint64_t offset, uint64_t size) {
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assert(offset <= _data.size() && offset + size <= _data.size()); //Also check offset < _data->size() because of possible overflow in the addition
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std::memcpy((uint8_t*)_data.data()+offset, source, size);
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_dataChanged = true;
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}
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size_t OnDiskBlock::size() const {
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return _data.size();
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}
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unique_ptr<OnDiskBlock> OnDiskBlock::LoadFromDisk(const bf::path &rootdir, const Key &key) {
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auto filepath = rootdir / key.ToString();
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try {
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//If it isn't a file, Data::LoadFromFile() would usually also crash. We still need this extra check
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//upfront, because Data::LoadFromFile() doesn't crash if we give it the path of a directory
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//instead the path of a file.
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if(!bf::is_regular_file(filepath)) {
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return nullptr;
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}
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Data data = Data::LoadFromFile(filepath);
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return unique_ptr<OnDiskBlock>(new OnDiskBlock(key, filepath, std::move(data)));
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} catch (const FileDoesntExistException &e) {
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return nullptr;
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}
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}
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unique_ptr<OnDiskBlock> OnDiskBlock::CreateOnDisk(const bf::path &rootdir, const Key &key, size_t size) {
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auto filepath = rootdir / key.ToString();
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if (bf::exists(filepath)) {
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return nullptr;
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}
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auto block = unique_ptr<OnDiskBlock>(new OnDiskBlock(key, filepath, size));
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block->_fillDataWithZeroes();
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block->_storeToDisk();
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return block;
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}
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void OnDiskBlock::RemoveFromDisk(const bf::path &rootdir, const Key &key) {
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auto filepath = rootdir / key.ToString();
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assert(bf::is_regular_file(filepath));
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bf::remove(filepath);
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}
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void OnDiskBlock::_fillDataWithZeroes() {
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_data.FillWithZeroes();
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}
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void OnDiskBlock::_storeToDisk() const {
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_data.StoreToFile(_filepath);
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}
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void OnDiskBlock::flush() {
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if (_dataChanged) {
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_storeToDisk();
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_dataChanged = false;
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}
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}
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}
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}
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