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// 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
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