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// Copyright (c) 2010 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 REMOTING_BASE_PROTOCOL_DECODER_H_
#define REMOTING_BASE_PROTOCOL_DECODER_H_
#include <deque>
#include <vector>
#include "base/ref_counted.h"
#include "google/protobuf/message_lite.h"
#include "media/base/data_buffer.h"
#include "remoting/base/protocol/chromotocol.pb.h"
namespace remoting {
typedef std::vector<ChromotingHostMessage*> HostMessageList;
typedef std::vector<ChromotingClientMessage*> ClientMessageList;
// A protocol decoder is used to decode data transmitted in the chromoting
// network.
// TODO(hclam): Defines the interface and implement methods.
class ProtocolDecoder {
public:
ProtocolDecoder();
virtual ~ProtocolDecoder() {}
// Parse data received from network into ClientMessages. Ownership of |data|
// is passed to this object and output is written to |messages|.
virtual void ParseClientMessages(scoped_refptr<media::DataBuffer> data,
ClientMessageList* messages);
// Parse data received from network into HostMessages. Ownership of |data|
// is passed to this object and output is written to |messages|.
virtual void ParseHostMessages(scoped_refptr<media::DataBuffer> data,
HostMessageList* messages);
private:
// A private method used to parse data received from network into protocol
// buffers.
template <typename T>
void ParseMessages(scoped_refptr<media::DataBuffer> data,
std::vector<T*>* messages);
// Parse one message from |data_list_|. Return true if sucessful.
template <typename T>
bool ParseOneMessage(T** messages);
// A utility method to read payload size of the protocol buffer from the
// data list. Return false if we don't have enough data.
bool GetPayloadSize(int* size);
typedef std::deque<scoped_refptr<media::DataBuffer> > DataList;
DataList data_list_;
size_t last_read_position_;
// Count the number of bytes in |data_list_| not read.
size_t available_bytes_;
// Stores the size of the next payload if known.
size_t next_payload_;
// True if the size of the next payload is known. After one payload is read,
// this is reset to false.
bool next_payload_known_;
};
} // namespace remoting
#endif // REMOTING_BASE_PROTOCOL_DECODER_H_
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