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00e67c1bf9
Reviewed By: lnicco Differential Revision: D33587012 fbshipit-source-id: 972eb440f0156c9c04aa6e8787561b18295c1a97
50 lines
1.7 KiB
C++
50 lines
1.7 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/QuicException.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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folly::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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folly::Expected<ParsedHeaderResult, TransportErrorCode> parseHeader(
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const folly::IOBuf& data) {
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folly::io::Cursor cursor(&data);
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if (!cursor.canAdvance(sizeof(uint8_t))) {
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return folly::makeUnexpected(TransportErrorCode::FRAME_ENCODING_ERROR);
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}
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uint8_t initialByte = cursor.readBE<uint8_t>();
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if (getHeaderForm(initialByte) == HeaderForm::Long) {
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return parseLongHeader(initialByte, cursor)
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.then([](ParsedLongHeaderResult&& parsedLongHeaderResult) {
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if (parsedLongHeaderResult.isVersionNegotiation) {
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return ParsedHeaderResult(true, folly::none);
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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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});
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} else {
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return parseShortHeader(initialByte, cursor).then([](ShortHeader&& header) {
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return ParsedHeaderResult(false, PacketHeader(std::move(header)));
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});
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}
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}
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} // namespace quic
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