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/supported_extensions_parameter.h" 11 12 #include <cstdint> 13 #include <string> 14 #include <utility> 15 #include <vector> 16 17 #include "absl/types/optional.h" 18 #include "api/array_view.h" 19 #include "net/dcsctp/common/str_join.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/rfc5061#section-4.2.7 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 = 0x8008 | Parameter Length | 33 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 34 // | CHUNK TYPE 1 | CHUNK TYPE 2 | CHUNK TYPE 3 | CHUNK TYPE 4 | 35 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 36 // | .... | 37 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 38 // | CHUNK TYPE N | PAD | PAD | PAD | 39 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 40 constexpr int SupportedExtensionsParameter::kType; 41 42 absl::optional<SupportedExtensionsParameter> Parse(rtc::ArrayView<const uint8_t> data)43SupportedExtensionsParameter::Parse(rtc::ArrayView<const uint8_t> data) { 44 absl::optional<BoundedByteReader<kHeaderSize>> reader = ParseTLV(data); 45 if (!reader.has_value()) { 46 return absl::nullopt; 47 } 48 49 std::vector<uint8_t> chunk_types(reader->variable_data().begin(), 50 reader->variable_data().end()); 51 return SupportedExtensionsParameter(std::move(chunk_types)); 52 } 53 SerializeTo(std::vector<uint8_t> & out) const54void SupportedExtensionsParameter::SerializeTo( 55 std::vector<uint8_t>& out) const { 56 BoundedByteWriter<kHeaderSize> writer = AllocateTLV(out, chunk_types_.size()); 57 writer.CopyToVariableData(chunk_types_); 58 } 59 ToString() const60std::string SupportedExtensionsParameter::ToString() const { 61 rtc::StringBuilder sb; 62 sb << "Supported Extensions (" << StrJoin(chunk_types_, ", ") << ")"; 63 return sb.Release(); 64 } 65 } // namespace dcsctp 66