diff options
Diffstat (limited to 'third_party/libwebrtc/net/dcsctp/packet/parameter/incoming_ssn_reset_request_parameter.cc')
-rw-r--r-- | third_party/libwebrtc/net/dcsctp/packet/parameter/incoming_ssn_reset_request_parameter.cc | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/third_party/libwebrtc/net/dcsctp/packet/parameter/incoming_ssn_reset_request_parameter.cc b/third_party/libwebrtc/net/dcsctp/packet/parameter/incoming_ssn_reset_request_parameter.cc new file mode 100644 index 0000000000..6191adfe9d --- /dev/null +++ b/third_party/libwebrtc/net/dcsctp/packet/parameter/incoming_ssn_reset_request_parameter.cc @@ -0,0 +1,89 @@ +/* + * Copyright (c) 2021 The WebRTC project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ +#include "net/dcsctp/packet/parameter/incoming_ssn_reset_request_parameter.h" + +#include <stddef.h> + +#include <cstdint> +#include <string> +#include <utility> +#include <vector> + +#include "absl/types/optional.h" +#include "api/array_view.h" +#include "net/dcsctp/packet/bounded_byte_reader.h" +#include "net/dcsctp/packet/bounded_byte_writer.h" +#include "net/dcsctp/packet/tlv_trait.h" +#include "rtc_base/strings/string_builder.h" + +namespace dcsctp { + +// https://tools.ietf.org/html/rfc6525#section-4.2 + +// 0 1 2 3 +// 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 +// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +// | Parameter Type = 14 | Parameter Length = 8 + 2 * N | +// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +// | Re-configuration Request Sequence Number | +// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +// | Stream Number 1 (optional) | Stream Number 2 (optional) | +// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +// / ...... / +// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +// | Stream Number N-1 (optional) | Stream Number N (optional) | +// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +constexpr int IncomingSSNResetRequestParameter::kType; + +absl::optional<IncomingSSNResetRequestParameter> +IncomingSSNResetRequestParameter::Parse(rtc::ArrayView<const uint8_t> data) { + absl::optional<BoundedByteReader<kHeaderSize>> reader = ParseTLV(data); + if (!reader.has_value()) { + return absl::nullopt; + } + + ReconfigRequestSN request_sequence_number(reader->Load32<4>()); + + size_t stream_count = reader->variable_data_size() / kStreamIdSize; + std::vector<StreamID> stream_ids; + stream_ids.reserve(stream_count); + for (size_t i = 0; i < stream_count; ++i) { + BoundedByteReader<kStreamIdSize> sub_reader = + reader->sub_reader<kStreamIdSize>(i * kStreamIdSize); + + stream_ids.push_back(StreamID(sub_reader.Load16<0>())); + } + + return IncomingSSNResetRequestParameter(request_sequence_number, + std::move(stream_ids)); +} + +void IncomingSSNResetRequestParameter::SerializeTo( + std::vector<uint8_t>& out) const { + size_t variable_size = stream_ids_.size() * kStreamIdSize; + BoundedByteWriter<kHeaderSize> writer = AllocateTLV(out, variable_size); + + writer.Store32<4>(*request_sequence_number_); + + for (size_t i = 0; i < stream_ids_.size(); ++i) { + BoundedByteWriter<kStreamIdSize> sub_writer = + writer.sub_writer<kStreamIdSize>(i * kStreamIdSize); + sub_writer.Store16<0>(*stream_ids_[i]); + } +} + +std::string IncomingSSNResetRequestParameter::ToString() const { + rtc::StringBuilder sb; + sb << "Incoming SSN Reset Request, req_seq_nbr=" + << *request_sequence_number(); + return sb.Release(); +} + +} // namespace dcsctp |