// Copyright 2016 The Chromium OS Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef _BSDIFF_MEMORY_FILE_H_ #define _BSDIFF_MEMORY_FILE_H_ #include <memory> #include <vector> #include "file_interface.h" namespace bsdiff { class MemoryFile : public FileInterface { public: // Creates a MemoryFile based on the underlying |file| passed. The MemoryFile // will cache all the write in memory and write it to to |file| when it's // closed. MemoryFile does not support read and seek. // |size| should be the estimated total file size, it is used to reserve // buffer space. MemoryFile(std::unique_ptr<FileInterface> file, size_t size); ~MemoryFile() override; // FileInterface overrides. bool Read(void* buf, size_t count, size_t* bytes_read) override; bool Write(const void* buf, size_t count, size_t* bytes_written) override; bool Seek(off_t pos) override; bool Close() override; bool GetSize(uint64_t* size) override; private: // The underlying FileInterace instance. std::unique_ptr<FileInterface> file_; std::vector<uint8_t> buffer_; }; } // namespace bsdiff #endif // _BSDIFF_MEMORY_FILE_H_