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 #ifndef NET_DCSCTP_PACKET_CHUNK_DATA_CHUNK_H_ 11 #define NET_DCSCTP_PACKET_CHUNK_DATA_CHUNK_H_ 12 #include <stddef.h> 13 #include <stdint.h> 14 15 #include <cstdint> 16 #include <string> 17 #include <utility> 18 #include <vector> 19 20 #include "absl/strings/string_view.h" 21 #include "api/array_view.h" 22 #include "net/dcsctp/packet/chunk/chunk.h" 23 #include "net/dcsctp/packet/chunk/data_common.h" 24 #include "net/dcsctp/packet/data.h" 25 #include "net/dcsctp/packet/tlv_trait.h" 26 27 namespace dcsctp { 28 29 // https://tools.ietf.org/html/rfc4960#section-3.3.1 30 struct DataChunkConfig : ChunkConfig { 31 static constexpr int kType = 0; 32 static constexpr size_t kHeaderSize = 16; 33 static constexpr size_t kVariableLengthAlignment = 1; 34 }; 35 36 class DataChunk : public AnyDataChunk, public TLVTrait<DataChunkConfig> { 37 public: 38 static constexpr int kType = DataChunkConfig::kType; 39 40 // Exposed to allow the retransmission queue to make room for the correct 41 // header size. 42 static constexpr size_t kHeaderSize = DataChunkConfig::kHeaderSize; 43 DataChunk(TSN tsn,StreamID stream_id,SSN ssn,PPID ppid,std::vector<uint8_t> payload,const Options & options)44 DataChunk(TSN tsn, 45 StreamID stream_id, 46 SSN ssn, 47 PPID ppid, 48 std::vector<uint8_t> payload, 49 const Options& options) 50 : AnyDataChunk(tsn, 51 stream_id, 52 ssn, 53 MID(0), 54 FSN(0), 55 ppid, 56 std::move(payload), 57 options) {} 58 DataChunk(TSN tsn,Data && data,bool immediate_ack)59 DataChunk(TSN tsn, Data&& data, bool immediate_ack) 60 : AnyDataChunk(tsn, std::move(data), immediate_ack) {} 61 62 static absl::optional<DataChunk> Parse(rtc::ArrayView<const uint8_t> data); 63 64 void SerializeTo(std::vector<uint8_t>& out) const override; 65 std::string ToString() const override; 66 }; 67 68 } // namespace dcsctp 69 70 #endif // NET_DCSCTP_PACKET_CHUNK_DATA_CHUNK_H_ 71