| // Copyright 2015 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 CHROMIUMOS_WIDE_PROFILING_BUFFER_READER_H_ |
| #define CHROMIUMOS_WIDE_PROFILING_BUFFER_READER_H_ |
| |
| #include "chromiumos-wide-profiling/data_reader.h" |
| |
| namespace quipper { |
| |
| // Read from a fixed-size data buffer. Does not take ownership of the buffer. |
| class BufferReader : public DataReader { |
| public: |
| // The data source is indicated by |buffer| and is |size| bytes long. |
| BufferReader(const void* buffer, size_t size) |
| : buffer_(reinterpret_cast<const char*>(buffer)), |
| offset_(0) { |
| size_ = size; |
| } |
| |
| void SeekSet(size_t offset) override { |
| offset_ = offset; |
| } |
| |
| size_t Tell() const override { |
| return offset_; |
| } |
| |
| bool ReadData(const size_t size, void* dest) override; |
| |
| // Reads |size| bytes of the buffer as a null-terminated string into |str|. |
| // Trailing nulls, if any, are not added to the string, but they are skipped |
| // over. If there is no null terminator within these |size| bytes, then the |
| // string is automatically terminated after |size| bytes. |
| bool ReadString(const size_t size, string* str) override; |
| |
| private: |
| // The data buffer from which to read. |
| const char* buffer_; |
| |
| // Data read offset from the start of |buffer_|. |
| size_t offset_; |
| }; |
| |
| } // namespace quipper |
| |
| #endif // CHROMIUMOS_WIDE_PROFILING_BUFFER_READER_H_ |