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8037fc6ffa
Bug: webrtc:342905193 No-Try: True Change-Id: Icc968be43b8830038ea9a1f5f604307220457807 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/361021 Auto-Submit: Florent Castelli <orphis@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Florent Castelli <orphis@webrtc.org> Cr-Commit-Position: refs/heads/main@{#42911}
58 lines
2.1 KiB
C++
58 lines
2.1 KiB
C++
/*
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* Copyright (c) 2023 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/zero_checksum_acceptable_chunk_parameter.h"
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#include <stdint.h>
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#include <optional>
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#include <vector>
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#include "api/array_view.h"
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#include "rtc_base/strings/string_builder.h"
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namespace dcsctp {
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// https://www.ietf.org/archive/id/draft-tuexen-tsvwg-sctp-zero-checksum-00.html#section-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 = 0x8001 (suggested) | Length = 8 |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Error Detection Method Identifier (EDMID) |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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constexpr int ZeroChecksumAcceptableChunkParameter::kType;
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std::optional<ZeroChecksumAcceptableChunkParameter>
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ZeroChecksumAcceptableChunkParameter::Parse(
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rtc::ArrayView<const uint8_t> data) {
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std::optional<BoundedByteReader<kHeaderSize>> reader = ParseTLV(data);
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if (!reader.has_value()) {
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return std::nullopt;
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}
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ZeroChecksumAlternateErrorDetectionMethod method(reader->Load32<4>());
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if (method == ZeroChecksumAlternateErrorDetectionMethod::None()) {
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return std::nullopt;
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}
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return ZeroChecksumAcceptableChunkParameter(method);
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}
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void ZeroChecksumAcceptableChunkParameter::SerializeTo(
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std::vector<uint8_t>& out) const {
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BoundedByteWriter<kHeaderSize> writer = AllocateTLV(out);
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writer.Store32<4>(*error_detection_method_);
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}
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std::string ZeroChecksumAcceptableChunkParameter::ToString() const {
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rtc::StringBuilder sb;
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sb << "Zero Checksum Acceptable (" << *error_detection_method_ << ")";
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return sb.Release();
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}
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} // namespace dcsctp
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