| // 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_ |