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/no_user_data_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-3.3.10.9 28 29 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 30 // | Cause Code=9 | Cause Length=8 | 31 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 32 // / TSN value / 33 // \ \ 34 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 35 constexpr int NoUserDataCause::kType; 36 Parse(rtc::ArrayView<const uint8_t> data)37absl::optional<NoUserDataCause> NoUserDataCause::Parse( 38 rtc::ArrayView<const uint8_t> data) { 39 absl::optional<BoundedByteReader<kHeaderSize>> reader = ParseTLV(data); 40 if (!reader.has_value()) { 41 return absl::nullopt; 42 } 43 TSN tsn(reader->Load32<4>()); 44 return NoUserDataCause(tsn); 45 } 46 SerializeTo(std::vector<uint8_t> & out) const47void NoUserDataCause::SerializeTo(std::vector<uint8_t>& out) const { 48 BoundedByteWriter<kHeaderSize> writer = AllocateTLV(out); 49 writer.Store32<4>(*tsn_); 50 } 51 ToString() const52std::string NoUserDataCause::ToString() const { 53 rtc::StringBuilder sb; 54 sb << "No User Data, tsn=" << *tsn_; 55 return sb.Release(); 56 } 57 } // namespace dcsctp 58