56 lines
1.9 KiB
C++
56 lines
1.9 KiB
C++
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/*
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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/shutdown_chunk.h"
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#include <stdint.h>
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#include <type_traits>
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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/tlv_trait.h"
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namespace dcsctp {
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// https://tools.ietf.org/html/rfc4960#section-3.3.8
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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 = 7 | Chunk Flags | Length = 8 |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Cumulative TSN Ack |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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constexpr int ShutdownChunk::kType;
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absl::optional<ShutdownChunk> ShutdownChunk::Parse(
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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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TSN cumulative_tsn_ack(reader->Load32<4>());
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return ShutdownChunk(cumulative_tsn_ack);
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}
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void ShutdownChunk::SerializeTo(std::vector<uint8_t>& out) const {
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BoundedByteWriter<kHeaderSize> writer = AllocateTLV(out);
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writer.Store32<4>(*cumulative_tsn_ack_);
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}
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std::string ShutdownChunk::ToString() const {
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return "SHUTDOWN";
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}
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} // namespace dcsctp
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