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
91
92
93
94
95
96
97
|
/*
* Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef NET_DCSCTP_PACKET_CHUNK_DATA_COMMON_H_
#define NET_DCSCTP_PACKET_CHUNK_DATA_COMMON_H_
#include <stdint.h>
#include <utility>
#include <vector>
#include "api/array_view.h"
#include "net/dcsctp/packet/chunk/chunk.h"
#include "net/dcsctp/packet/data.h"
namespace dcsctp {
// Base class for DataChunk and IDataChunk
class AnyDataChunk : public Chunk {
public:
// Represents the "immediate ack" flag on DATA/I-DATA, from RFC7053.
using ImmediateAckFlag = webrtc::StrongAlias<class ImmediateAckFlagTag, bool>;
// Data chunk options.
// See https://tools.ietf.org/html/rfc4960#section-3.3.1
struct Options {
Data::IsEnd is_end = Data::IsEnd(false);
Data::IsBeginning is_beginning = Data::IsBeginning(false);
IsUnordered is_unordered = IsUnordered(false);
ImmediateAckFlag immediate_ack = ImmediateAckFlag(false);
};
TSN tsn() const { return tsn_; }
Options options() const {
Options options;
options.is_end = data_.is_end;
options.is_beginning = data_.is_beginning;
options.is_unordered = data_.is_unordered;
options.immediate_ack = immediate_ack_;
return options;
}
StreamID stream_id() const { return data_.stream_id; }
SSN ssn() const { return data_.ssn; }
MID message_id() const { return data_.message_id; }
FSN fsn() const { return data_.fsn; }
PPID ppid() const { return data_.ppid; }
rtc::ArrayView<const uint8_t> payload() const { return data_.payload; }
// Extracts the Data from the chunk, as a destructive action.
Data extract() && { return std::move(data_); }
AnyDataChunk(TSN tsn,
StreamID stream_id,
SSN ssn,
MID message_id,
FSN fsn,
PPID ppid,
std::vector<uint8_t> payload,
const Options& options)
: tsn_(tsn),
data_(stream_id,
ssn,
message_id,
fsn,
ppid,
std::move(payload),
options.is_beginning,
options.is_end,
options.is_unordered),
immediate_ack_(options.immediate_ack) {}
AnyDataChunk(TSN tsn, Data data, bool immediate_ack)
: tsn_(tsn), data_(std::move(data)), immediate_ack_(immediate_ack) {}
protected:
// Bits in `flags` header field.
static constexpr int kFlagsBitEnd = 0;
static constexpr int kFlagsBitBeginning = 1;
static constexpr int kFlagsBitUnordered = 2;
static constexpr int kFlagsBitImmediateAck = 3;
private:
TSN tsn_;
Data data_;
ImmediateAckFlag immediate_ack_;
};
} // namespace dcsctp
#endif // NET_DCSCTP_PACKET_CHUNK_DATA_COMMON_H_
|
