xref: /aosp_15_r20/external/webrtc/net/dcsctp/packet/parameter/ssn_tsn_reset_request_parameter.cc (revision d9f758449e529ab9291ac668be2861e7a55c2422) 
1 /*
2  *  Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 #include "net/dcsctp/packet/parameter/ssn_tsn_reset_request_parameter.h"
11 
12 #include <stdint.h>
13 
14 #include <string>
15 #include <type_traits>
16 #include <vector>
17 
18 #include "absl/types/optional.h"
19 #include "api/array_view.h"
20 #include "net/dcsctp/packet/bounded_byte_reader.h"
21 #include "net/dcsctp/packet/bounded_byte_writer.h"
22 #include "net/dcsctp/packet/tlv_trait.h"
23 #include "rtc_base/strings/string_builder.h"
24 
25 namespace dcsctp {
26 
27 // https://tools.ietf.org/html/rfc6525#section-4.3
28 
29 //   0                   1                   2                   3
30 //   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
31 //  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
32 //  |     Parameter Type = 15       |      Parameter Length = 8     |
33 //  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
34 //  |         Re-configuration Request Sequence Number              |
35 //  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
36 constexpr int SSNTSNResetRequestParameter::kType;
37 
Parse(rtc::ArrayView<const uint8_t> data)38 absl::optional<SSNTSNResetRequestParameter> SSNTSNResetRequestParameter::Parse(
39     rtc::ArrayView<const uint8_t> data) {
40   absl::optional<BoundedByteReader<kHeaderSize>> reader = ParseTLV(data);
41   if (!reader.has_value()) {
42     return absl::nullopt;
43   }
44   ReconfigRequestSN request_sequence_number(reader->Load32<4>());
45 
46   return SSNTSNResetRequestParameter(request_sequence_number);
47 }
48 
SerializeTo(std::vector<uint8_t> & out) const49 void SSNTSNResetRequestParameter::SerializeTo(std::vector<uint8_t>& out) const {
50   BoundedByteWriter<kHeaderSize> writer = AllocateTLV(out);
51   writer.Store32<4>(*request_sequence_number_);
52 }
53 
ToString() const54 std::string SSNTSNResetRequestParameter::ToString() const {
55   rtc::StringBuilder sb;
56   sb << "SSN/TSN Reset Request, req_seq_nbr=" << *request_sequence_number();
57   return sb.Release();
58 }
59 
60 }  // namespace dcsctp
61