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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.
#ifndef COMPONENTS_PAIRING_MESSAGE_BUFFER_H_
#define COMPONENTS_PAIRING_MESSAGE_BUFFER_H_
#include <deque>
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
namespace net {
class IOBuffer;
}
namespace pairing_chromeos {
// A MessageBuffer is a simple wrapper around an ordered set of buffers received
// from a socket. It keeps track of the amount of unread data, and allows data
// to be retreived that was split across buffers in a single chunk.
class MessageBuffer {
public:
MessageBuffer();
~MessageBuffer();
// Returns the number of bytes currently received, but not yet read.
int AvailableBytes();
// Read |size| bytes into |buffer|. |size| must be smaller than or equal to
// the current number of available bytes.
void ReadBytes(char* buffer, int size);
// Add the data from an IOBuffer. A reference to the IOBuffer will be
// maintained until it is drained.
void AddIOBuffer(scoped_refptr<net::IOBuffer> io_buffer, int size);
private:
// Offset of the next byte to be read from the current IOBuffer.
int buffer_offset_;
// Total number of bytes in IOBuffers in |pending_data_|, including bytes that
// have already been read.
int total_buffer_size_;
std::deque<std::pair<scoped_refptr<net::IOBuffer>, int> > pending_data_;
DISALLOW_COPY_AND_ASSIGN(MessageBuffer);
};
} // namespace pairing_chromeos
#endif // COMPONENTS_PAIRING_MESSAGE_BUFFER_H_
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