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// 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_BUFFER_FILE_H_
#define _BSDIFF_BUFFER_FILE_H_
#include <memory>
#include <vector>
#include "bsdiff/file_interface.h"
namespace bsdiff {
class BufferFile : public FileInterface {
public:
// Creates a write only BufferFile based on the underlying |file| passed.
// The BufferFile will cache all the write in a buffer and write everything
// to |file| at once upon closing. Read and Seek are not supported.
// |size| should be the estimated total file size, it is used to reserve
// buffer space.
BufferFile(std::unique_ptr<FileInterface> file, size_t size);
~BufferFile() 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_ = nullptr;
std::vector<uint8_t> buffer_;
};
} // namespace bsdiff
#endif // _BSDIFF_BUFFER_FILE_H_
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