1// Copyright 2015 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 CHROMIUMOS_WIDE_PROFILING_BUFFER_WRITER_H_
6#define CHROMIUMOS_WIDE_PROFILING_BUFFER_WRITER_H_
7
8#include "data_writer.h"
9
10namespace quipper {
11
12// Writes data to a fixed-size memory buffer.
13class BufferWriter : public DataWriter {
14 public:
15  // The destination buffer is indicated by |buffer| and is |size| bytes long.
16  BufferWriter(void* buffer, size_t size)
17      : buffer_(reinterpret_cast<char*>(buffer)), offset_(0) {
18    size_ = size;
19  }
20
21  void SeekSet(size_t offset) override { offset_ = offset; }
22
23  size_t Tell() const override { return offset_; }
24
25  bool WriteData(const void* src, const size_t size) override;
26
27  bool WriteString(const string& str, const size_t size) override;
28
29 private:
30  bool CanWriteSize(size_t data_size) override;
31
32  // Pointer to the data buffer. Does not own the buffer.
33  char* buffer_;
34
35  // Current write offset, in bytes from start of buffer.
36  size_t offset_;
37};
38
39}  // namespace quipper
40
41#endif  // CHROMIUMOS_WIDE_PROFILING_BUFFER_WRITER_H_
42