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bceec84aee
half of the remaining folders git ls-files | grep -e "\(\.h\|\.cc\)$" | grep -E "^(api|call|common_audio|examples|media|net|p2p|pc)/" | xargs clang-format -i ; git cl format after landing: add to .git-blame-ignore-revs Bug: webrtc:15082 Change-Id: I8b2cac13f4587d3ce9b2fccc7362967283f57ea2 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/302062 Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Cr-Commit-Position: refs/heads/main@{#39977}
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/chunk/data_chunk.h"
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#include <stdint.h>
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#include <string>
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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/chunk/data_common.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/rfc4960#section-3.3.1
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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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// | Type = 0 | Reserved|U|B|E| Length |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | TSN |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Stream Identifier S | Stream Sequence Number n |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Payload Protocol Identifier |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// \ \
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// / User Data (seq n of Stream S) /
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// \ \
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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constexpr int DataChunk::kType;
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absl::optional<DataChunk> DataChunk::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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uint8_t flags = reader->Load8<1>();
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TSN tsn(reader->Load32<4>());
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StreamID stream_identifier(reader->Load16<8>());
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SSN ssn(reader->Load16<10>());
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PPID ppid(reader->Load32<12>());
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Options options;
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options.is_end = Data::IsEnd((flags & (1 << kFlagsBitEnd)) != 0);
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options.is_beginning =
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Data::IsBeginning((flags & (1 << kFlagsBitBeginning)) != 0);
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options.is_unordered = IsUnordered((flags & (1 << kFlagsBitUnordered)) != 0);
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options.immediate_ack =
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ImmediateAckFlag((flags & (1 << kFlagsBitImmediateAck)) != 0);
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return DataChunk(tsn, stream_identifier, ssn, ppid,
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std::vector<uint8_t>(reader->variable_data().begin(),
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reader->variable_data().end()),
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options);
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}
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void DataChunk::SerializeTo(std::vector<uint8_t>& out) const {
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BoundedByteWriter<kHeaderSize> writer = AllocateTLV(out, payload().size());
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writer.Store8<1>(
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(*options().is_end ? (1 << kFlagsBitEnd) : 0) |
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(*options().is_beginning ? (1 << kFlagsBitBeginning) : 0) |
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(*options().is_unordered ? (1 << kFlagsBitUnordered) : 0) |
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(*options().immediate_ack ? (1 << kFlagsBitImmediateAck) : 0));
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writer.Store32<4>(*tsn());
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writer.Store16<8>(*stream_id());
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writer.Store16<10>(*ssn());
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writer.Store32<12>(*ppid());
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writer.CopyToVariableData(payload());
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}
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std::string DataChunk::ToString() const {
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rtc::StringBuilder sb;
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sb << "DATA, type=" << (options().is_unordered ? "unordered" : "ordered")
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<< "::"
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<< (*options().is_beginning && *options().is_end ? "complete"
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: *options().is_beginning ? "first"
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: *options().is_end ? "last"
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: "middle")
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<< ", tsn=" << *tsn() << ", sid=" << *stream_id() << ", ssn=" << *ssn()
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<< ", ppid=" << *ppid() << ", length=" << payload().size();
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return sb.Release();
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}
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} // namespace dcsctp
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