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 10 namespace quipper { 11 12 // Read from a fixed-size data buffer. Does not take ownership of the buffer. 13 class BufferReader : public DataReader { 14 public: 15 // The data source is indicated by |buffer| and is |size| bytes long. BufferReader(const void * buffer,size_t size)16 BufferReader(const void* buffer, size_t size) 17 : buffer_(reinterpret_cast<const char*>(buffer)), offset_(0) { 18 size_ = size; 19 } 20 SeekSet(size_t offset)21 void SeekSet(size_t offset) override { offset_ = offset; } 22 Tell()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