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https://github.com/mollyim/webrtc.git
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0e73602a9f
Adding strong types went a little too far as these two types represent the same sequence number. A "request sequence number" is a number, that - when responded to - will be used as "response sequence number". Having them separate added confusion and just a lot of type-casting. Bug: webrtc:12614 Change-Id: I4636ea8f2252023a2d5a9b7033763e1978b1812e Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/214130 Commit-Queue: Victor Boivie <boivie@webrtc.org> Reviewed-by: Florent Castelli <orphis@webrtc.org> Cr-Commit-Position: refs/heads/master@{#33789}
101 lines
4 KiB
C++
101 lines
4 KiB
C++
/*
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* Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "net/dcsctp/packet/parameter/outgoing_ssn_reset_request_parameter.h"
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#include <stddef.h>
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#include <cstdint>
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#include <string>
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#include <utility>
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#include <vector>
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#include "absl/types/optional.h"
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#include "api/array_view.h"
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#include "net/dcsctp/common/internal_types.h"
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#include "net/dcsctp/packet/bounded_byte_reader.h"
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#include "net/dcsctp/packet/bounded_byte_writer.h"
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#include "net/dcsctp/packet/tlv_trait.h"
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#include "net/dcsctp/public/types.h"
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#include "rtc_base/strings/string_builder.h"
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namespace dcsctp {
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// https://tools.ietf.org/html/rfc6525#section-4.1
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// 0 1 2 3
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// 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
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Parameter Type = 13 | Parameter Length = 16 + 2 * N |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Re-configuration Request Sequence Number |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Re-configuration Response Sequence Number |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Sender's Last Assigned TSN |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Stream Number 1 (optional) | Stream Number 2 (optional) |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// / ...... /
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Stream Number N-1 (optional) | Stream Number N (optional) |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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constexpr int OutgoingSSNResetRequestParameter::kType;
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absl::optional<OutgoingSSNResetRequestParameter>
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OutgoingSSNResetRequestParameter::Parse(rtc::ArrayView<const uint8_t> data) {
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absl::optional<BoundedByteReader<kHeaderSize>> reader = ParseTLV(data);
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if (!reader.has_value()) {
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return absl::nullopt;
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}
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ReconfigRequestSN request_sequence_number(reader->Load32<4>());
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ReconfigRequestSN response_sequence_number(reader->Load32<8>());
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TSN sender_last_assigned_tsn(reader->Load32<12>());
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size_t stream_count = reader->variable_data_size() / kStreamIdSize;
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std::vector<StreamID> stream_ids;
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stream_ids.reserve(stream_count);
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for (size_t i = 0; i < stream_count; ++i) {
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BoundedByteReader<kStreamIdSize> sub_reader =
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reader->sub_reader<kStreamIdSize>(i * kStreamIdSize);
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stream_ids.push_back(StreamID(sub_reader.Load16<0>()));
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}
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return OutgoingSSNResetRequestParameter(
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request_sequence_number, response_sequence_number,
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sender_last_assigned_tsn, std::move(stream_ids));
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}
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void OutgoingSSNResetRequestParameter::SerializeTo(
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std::vector<uint8_t>& out) const {
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size_t variable_size = stream_ids_.size() * kStreamIdSize;
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BoundedByteWriter<kHeaderSize> writer = AllocateTLV(out, variable_size);
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writer.Store32<4>(*request_sequence_number_);
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writer.Store32<8>(*response_sequence_number_);
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writer.Store32<12>(*sender_last_assigned_tsn_);
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for (size_t i = 0; i < stream_ids_.size(); ++i) {
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BoundedByteWriter<kStreamIdSize> sub_writer =
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writer.sub_writer<kStreamIdSize>(i * kStreamIdSize);
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sub_writer.Store16<0>(*stream_ids_[i]);
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}
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}
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std::string OutgoingSSNResetRequestParameter::ToString() const {
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rtc::StringBuilder sb;
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sb << "Outgoing SSN Reset Request, req_seq_nbr=" << *request_sequence_number()
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<< ", resp_seq_nbr=" << *response_sequence_number()
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<< ", sender_last_asg_tsn=" << *sender_last_assigned_tsn();
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return sb.Release();
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}
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} // namespace dcsctp
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