xref: /aosp_15_r20/external/webrtc/net/dcsctp/packet/error_cause/invalid_stream_identifier_cause.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/error_cause/invalid_stream_identifier_cause.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/rfc4960#section-3.3.10.1
28 
29 //  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
30 //  |     Cause Code=1              |      Cause Length=8           |
31 //  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
32 //  |        Stream Identifier      |         (Reserved)            |
33 //  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
34 constexpr int InvalidStreamIdentifierCause::kType;
35 
36 absl::optional<InvalidStreamIdentifierCause>
Parse(rtc::ArrayView<const uint8_t> data)37 InvalidStreamIdentifierCause::Parse(rtc::ArrayView<const uint8_t> data) {
38   absl::optional<BoundedByteReader<kHeaderSize>> reader = ParseTLV(data);
39   if (!reader.has_value()) {
40     return absl::nullopt;
41   }
42 
43   StreamID stream_id(reader->Load16<4>());
44   return InvalidStreamIdentifierCause(stream_id);
45 }
46 
SerializeTo(std::vector<uint8_t> & out) const47 void InvalidStreamIdentifierCause::SerializeTo(
48     std::vector<uint8_t>& out) const {
49   BoundedByteWriter<kHeaderSize> writer = AllocateTLV(out);
50 
51   writer.Store16<4>(*stream_id_);
52 }
53 
ToString() const54 std::string InvalidStreamIdentifierCause::ToString() const {
55   rtc::StringBuilder sb;
56   sb << "Invalid Stream Identifier, stream_id=" << *stream_id_;
57   return sb.Release();
58 }
59 
60 }  // namespace dcsctp
61