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49bec37d9b
Bug: webrtc:12614 Change-Id: I08fa2d43671972a3115c09228a9cd089a53c5c89 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/214341 Reviewed-by: Florent Castelli <orphis@webrtc.org> Commit-Queue: Victor Boivie <boivie@webrtc.org> Cr-Commit-Position: refs/heads/master@{#33790}
88 lines
3.5 KiB
C++
88 lines
3.5 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/chunk/init_chunk.h"
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#include <stdint.h>
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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/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/parameter/parameter.h"
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#include "net/dcsctp/packet/tlv_trait.h"
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#include "rtc_base/strings/string_format.h"
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namespace dcsctp {
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// https://tools.ietf.org/html/rfc4960#section-3.3.2
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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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// | Type = 1 | Chunk Flags | Chunk Length |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Initiate Tag |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Advertised Receiver Window Credit (a_rwnd) |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Number of Outbound Streams | Number of Inbound Streams |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Initial TSN |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// \ \
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// / Optional/Variable-Length Parameters /
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// \ \
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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constexpr int InitChunk::kType;
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absl::optional<InitChunk> InitChunk::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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VerificationTag initiate_tag(reader->Load32<4>());
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uint32_t a_rwnd = reader->Load32<8>();
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uint16_t nbr_outbound_streams = reader->Load16<12>();
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uint16_t nbr_inbound_streams = reader->Load16<14>();
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TSN initial_tsn(reader->Load32<16>());
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absl::optional<Parameters> parameters =
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Parameters::Parse(reader->variable_data());
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if (!parameters.has_value()) {
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return absl::nullopt;
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}
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return InitChunk(initiate_tag, a_rwnd, nbr_outbound_streams,
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nbr_inbound_streams, initial_tsn, *std::move(parameters));
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}
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void InitChunk::SerializeTo(std::vector<uint8_t>& out) const {
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rtc::ArrayView<const uint8_t> parameters = parameters_.data();
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BoundedByteWriter<kHeaderSize> writer = AllocateTLV(out, parameters.size());
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writer.Store32<4>(*initiate_tag_);
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writer.Store32<8>(a_rwnd_);
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writer.Store16<12>(nbr_outbound_streams_);
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writer.Store16<14>(nbr_inbound_streams_);
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writer.Store32<16>(*initial_tsn_);
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writer.CopyToVariableData(parameters);
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}
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std::string InitChunk::ToString() const {
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return rtc::StringFormat("INIT, initiate_tag=0x%0x, initial_tsn=%u",
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*initiate_tag(), *initial_tsn());
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}
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} // namespace dcsctp
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