blob: b22f6ba40e08ed31d67e6c9cb08066145bfbef5d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
// 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_PROTOCOL_MESSAGES_DECODER_H_
#define REMOTING_PROTOCOL_MESSAGES_DECODER_H_
#include <deque>
#include <list>
#include "base/ref_counted.h"
#include "google/protobuf/message_lite.h"
#include "remoting/proto/internal.pb.h"
namespace net {
class IOBuffer;
}
namespace remoting {
typedef std::list<ChromotingHostMessage*> HostMessageList;
typedef std::list<ChromotingClientMessage*> ClientMessageList;
// A protocol decoder is used to decode data transmitted in the chromoting
// network.
// TODO(hclam): Defines the interface and implement methods.
class MessagesDecoder {
public:
MessagesDecoder();
virtual ~MessagesDecoder();
// Parse data received from network into ClientMessages. Output is written
// to |messages|.
virtual void ParseClientMessages(scoped_refptr<net::IOBuffer> data,
int data_size,
ClientMessageList* messages);
// Parse data received from network into HostMessages. Output is
// written to |messages|.
virtual void ParseHostMessages(scoped_refptr<net::IOBuffer> data,
int data_size,
HostMessageList* messages);
private:
// DataChunk stores reference to a net::IOBuffer and size of the data
// stored in that buffer.
struct DataChunk {
DataChunk(net::IOBuffer* data, size_t data_size);
~DataChunk();
scoped_refptr<net::IOBuffer> data;
size_t data_size;
};
// TODO(sergeyu): It might be more efficient to memcopy data to one big buffer
// instead of storing chunks in dqueue.
typedef std::deque<DataChunk> DataList;
// A private method used to parse data received from network into protocol
// buffers.
template <typename T>
void ParseMessages(scoped_refptr<net::IOBuffer> data,
int data_size,
std::list<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);
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_PROTOCOL_MESSAGES_DECODER_H_
|
