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/add_outgoing_streams_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-4.5 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 = 17 | Parameter Length = 12 | 33 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 34 // | Re-configuration Request Sequence Number | 35 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 36 // | Number of new streams | Reserved | 37 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 38 constexpr int AddOutgoingStreamsRequestParameter::kType; 39 40 absl::optional<AddOutgoingStreamsRequestParameter> Parse(rtc::ArrayView<const uint8_t> data)41AddOutgoingStreamsRequestParameter::Parse(rtc::ArrayView<const uint8_t> data) { 42 absl::optional<BoundedByteReader<kHeaderSize>> reader = ParseTLV(data); 43 if (!reader.has_value()) { 44 return absl::nullopt; 45 } 46 ReconfigRequestSN request_sequence_number(reader->Load32<4>()); 47 uint16_t nbr_of_new_streams = reader->Load16<8>(); 48 49 return AddOutgoingStreamsRequestParameter(request_sequence_number, 50 nbr_of_new_streams); 51 } 52 SerializeTo(std::vector<uint8_t> & out) const53void AddOutgoingStreamsRequestParameter::SerializeTo( 54 std::vector<uint8_t>& out) const { 55 BoundedByteWriter<kHeaderSize> writer = AllocateTLV(out); 56 writer.Store32<4>(*request_sequence_number_); 57 writer.Store16<8>(nbr_of_new_streams_); 58 } 59 ToString() const60std::string AddOutgoingStreamsRequestParameter::ToString() const { 61 rtc::StringBuilder sb; 62 sb << "Add Outgoing Streams Request, req_seq_nbr=" 63 << *request_sequence_number(); 64 return sb.Release(); 65 } 66 67 } // namespace dcsctp 68