1// Copyright 2016 The Chromium OS Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef _BSDIFF_SINK_FILE_H_
6#define _BSDIFF_SINK_FILE_H_
7
8#include <stdint.h>
9
10#include <functional>
11
12#include "file_interface.h"
13
14using sink_func = std::function<size_t(const uint8_t*, size_t)>;
15
16namespace bsdiff {
17
18class SinkFile : public FileInterface {
19 public:
20  // Creates a SinkFile based on the underlying |sink| function passed.
21  // The SinkFile will call |sink| function upon write.
22  // Read, Seek and GetSize are not supported.
23  explicit SinkFile(const sink_func& sink);
24
25  ~SinkFile() = default;
26
27  // FileInterface overrides.
28  bool Read(void* buf, size_t count, size_t* bytes_read) override;
29  bool Write(const void* buf, size_t count, size_t* bytes_written) override;
30  bool Seek(off_t pos) override;
31  bool Close() override;
32  bool GetSize(uint64_t* size) override;
33
34 private:
35  // The sink() function used to write data.
36  const sink_func& sink_;
37};
38
39}  // namespace bsdiff
40
41#endif  // _BSDIFF_SINK_FILE_H_
42