1 // Copyright 2014 The Chromium 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 #include "components/pairing/message_buffer.h" 6 7 #include "net/base/io_buffer.h" 8 9 namespace pairing_chromeos { 10 11 MessageBuffer::MessageBuffer() 12 : buffer_offset_(0), 13 total_buffer_size_(0) { 14 } 15 16 MessageBuffer::~MessageBuffer() {} 17 18 int MessageBuffer::AvailableBytes() { 19 return total_buffer_size_ - buffer_offset_; 20 } 21 22 void MessageBuffer::ReadBytes(char* buffer, int size) { 23 CHECK_LE(size, AvailableBytes()); 24 25 int offset = 0; 26 while (offset < size) { 27 scoped_refptr<net::IOBuffer> io_buffer = pending_data_.front().first; 28 int io_buffer_size = pending_data_.front().second; 29 30 CHECK_GT(io_buffer_size, buffer_offset_); 31 int copy_size = std::min(size - offset, io_buffer_size - buffer_offset_); 32 memcpy(&buffer[offset], &io_buffer->data()[buffer_offset_], copy_size); 33 34 offset += copy_size; 35 buffer_offset_ += copy_size; 36 37 CHECK_LE(buffer_offset_, io_buffer_size); 38 if (buffer_offset_ == io_buffer_size) { 39 CHECK_GE(total_buffer_size_, io_buffer_size); 40 total_buffer_size_ -= io_buffer_size; 41 pending_data_.pop_front(); 42 buffer_offset_ = 0; 43 } 44 } 45 CHECK_EQ(offset, size); 46 } 47 48 void MessageBuffer::AddIOBuffer(scoped_refptr<net::IOBuffer> io_buffer, 49 int size) { 50 if (size == 0) 51 return; 52 pending_data_.push_back(std::make_pair(io_buffer, size)); 53 total_buffer_size_ += size; 54 } 55 56 } // namespace pairing_chromeos 57
