| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "components/pairing/message_buffer.h" |
| |
| #include "net/base/io_buffer.h" |
| |
| namespace pairing_chromeos { |
| |
| MessageBuffer::MessageBuffer() |
| : buffer_offset_(0), |
| total_buffer_size_(0) { |
| } |
| |
| MessageBuffer::~MessageBuffer() {} |
| |
| int MessageBuffer::AvailableBytes() { |
| return total_buffer_size_ - buffer_offset_; |
| } |
| |
| void MessageBuffer::ReadBytes(char* buffer, int size) { |
| CHECK_LE(size, AvailableBytes()); |
| |
| int offset = 0; |
| while (offset < size) { |
| scoped_refptr<net::IOBuffer> io_buffer = pending_data_.front().first; |
| int io_buffer_size = pending_data_.front().second; |
| |
| CHECK_GT(io_buffer_size, buffer_offset_); |
| int copy_size = std::min(size - offset, io_buffer_size - buffer_offset_); |
| memcpy(&buffer[offset], &io_buffer->data()[buffer_offset_], copy_size); |
| |
| offset += copy_size; |
| buffer_offset_ += copy_size; |
| |
| CHECK_LE(buffer_offset_, io_buffer_size); |
| if (buffer_offset_ == io_buffer_size) { |
| CHECK_GE(total_buffer_size_, io_buffer_size); |
| total_buffer_size_ -= io_buffer_size; |
| pending_data_.pop_front(); |
| buffer_offset_ = 0; |
| } |
| } |
| CHECK_EQ(offset, size); |
| } |
| |
| void MessageBuffer::AddIOBuffer(scoped_refptr<net::IOBuffer> io_buffer, |
| int size) { |
| if (size == 0) |
| return; |
| pending_data_.push_back(std::make_pair(io_buffer, size)); |
| total_buffer_size_ += size; |
| } |
| |
| } // namespace pairing_chromeos |