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_READER_H_ 6#define CHROMIUMOS_WIDE_PROFILING_BUFFER_READER_H_ 7 8#include "data_reader.h" 9 10namespace quipper { 11 12// Read from a fixed-size data buffer. Does not take ownership of the buffer. 13class BufferReader : public DataReader { 14 public: 15 // The data source is indicated by |buffer| and is |size| bytes long. 16 BufferReader(const void* buffer, size_t size) 17 : buffer_(reinterpret_cast<const 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 ReadData(const size_t size, void* dest) override; 26 27 // Reads |size| bytes of the buffer as a null-terminated string into |str|. 28 // Trailing nulls, if any, are not added to the string, but they are skipped 29 // over. If there is no null terminator within these |size| bytes, then the 30 // string is automatically terminated after |size| bytes. 31 bool ReadString(const size_t size, string* str) override; 32 33 private: 34 // The data buffer from which to read. 35 const char* buffer_; 36 37 // Data read offset from the start of |buffer_|. 38 size_t offset_; 39}; 40 41} // namespace quipper 42 43#endif // CHROMIUMOS_WIDE_PROFILING_BUFFER_READER_H_ 44