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c3ca05e64d
Summary: See title Reviewed By: hanidamlaj Differential Revision: D81165959 fbshipit-source-id: 99c5d19c93deb9aa4794bf203ab888edce44b58a
54 lines
1.8 KiB
C++
54 lines
1.8 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#include <quic/codec/QuicHeaderCodec.h>
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#include <quic/codec/Decode.h>
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namespace quic {
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ParsedHeaderResult::ParsedHeaderResult(
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bool isVersionNegotiationIn,
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Optional<PacketHeader> parsedHeaderIn)
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: isVersionNegotiation(isVersionNegotiationIn),
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parsedHeader(std::move(parsedHeaderIn)) {
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CHECK(isVersionNegotiation || parsedHeader);
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}
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quic::Expected<ParsedHeaderResult, TransportErrorCode> parseHeader(
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const folly::IOBuf& data) {
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ContiguousReadCursor cursor(data.data(), data.length());
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uint8_t initialByte = 0;
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if (!cursor.tryReadBE(initialByte)) {
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return quic::make_unexpected(TransportErrorCode::FRAME_ENCODING_ERROR);
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}
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if (getHeaderForm(initialByte) == HeaderForm::Long) {
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auto longHeaderResult = parseLongHeader(initialByte, cursor);
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if (!longHeaderResult.has_value()) {
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return quic::make_unexpected(longHeaderResult.error());
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}
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auto parsedLongHeaderResult = std::move(longHeaderResult.value());
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if (parsedLongHeaderResult.isVersionNegotiation) {
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return ParsedHeaderResult(true, std::nullopt);
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}
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// We compensate for the type byte length by adding it back.
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DCHECK(parsedLongHeaderResult.parsedLongHeader);
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return ParsedHeaderResult(
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false,
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PacketHeader(
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std::move(parsedLongHeaderResult.parsedLongHeader->header)));
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} else {
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auto shortHeaderResult = parseShortHeader(initialByte, cursor);
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if (!shortHeaderResult.has_value()) {
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return quic::make_unexpected(shortHeaderResult.error());
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}
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return ParsedHeaderResult(
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false, PacketHeader(std::move(shortHeaderResult.value())));
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}
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}
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} // namespace quic
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