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/chunk/heartbeat_request_chunk.h" 11 12 #include <stdint.h> 13 14 #include <utility> 15 #include <vector> 16 17 #include "absl/types/optional.h" 18 #include "api/array_view.h" 19 #include "net/dcsctp/packet/bounded_byte_reader.h" 20 #include "net/dcsctp/packet/bounded_byte_writer.h" 21 #include "net/dcsctp/packet/parameter/parameter.h" 22 #include "net/dcsctp/packet/tlv_trait.h" 23 24 namespace dcsctp { 25 26 // https://tools.ietf.org/html/rfc4960#section-3.3.5 27 28 // 0 1 2 3 29 // 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 30 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 31 // | Type = 4 | Chunk Flags | Heartbeat Length | 32 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 33 // \ \ 34 // / Heartbeat Information TLV (Variable-Length) / 35 // \ \ 36 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 37 constexpr int HeartbeatRequestChunk::kType; 38 Parse(rtc::ArrayView<const uint8_t> data)39absl::optional<HeartbeatRequestChunk> HeartbeatRequestChunk::Parse( 40 rtc::ArrayView<const uint8_t> data) { 41 absl::optional<BoundedByteReader<kHeaderSize>> reader = ParseTLV(data); 42 if (!reader.has_value()) { 43 return absl::nullopt; 44 } 45 46 absl::optional<Parameters> parameters = 47 Parameters::Parse(reader->variable_data()); 48 if (!parameters.has_value()) { 49 return absl::nullopt; 50 } 51 return HeartbeatRequestChunk(*std::move(parameters)); 52 } 53 SerializeTo(std::vector<uint8_t> & out) const54void HeartbeatRequestChunk::SerializeTo(std::vector<uint8_t>& out) const { 55 rtc::ArrayView<const uint8_t> parameters = parameters_.data(); 56 BoundedByteWriter<kHeaderSize> writer = AllocateTLV(out, parameters.size()); 57 writer.CopyToVariableData(parameters); 58 } 59 ToString() const60std::string HeartbeatRequestChunk::ToString() const { 61 return "HEARTBEAT"; 62 } 63 64 } // namespace dcsctp 65