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// Copyright (c) 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "quiche/quic/core/qpack/qpack_decoded_headers_accumulator.h"
#include "absl/strings/string_view.h"
#include "quiche/quic/core/qpack/qpack_decoder.h"
#include "quiche/quic/core/qpack/qpack_header_table.h"
#include "quiche/quic/platform/api/quic_bug_tracker.h"
namespace quic {
QpackDecodedHeadersAccumulator::QpackDecodedHeadersAccumulator(
QuicStreamId id, QpackDecoder* qpack_decoder, Visitor* visitor,
size_t max_header_list_size)
: decoder_(qpack_decoder->CreateProgressiveDecoder(id, this)),
visitor_(visitor),
max_header_list_size_(max_header_list_size),
uncompressed_header_bytes_including_overhead_(0),
uncompressed_header_bytes_without_overhead_(0),
compressed_header_bytes_(0),
header_list_size_limit_exceeded_(false),
headers_decoded_(false),
error_detected_(false) {
quic_header_list_.OnHeaderBlockStart();
}
void QpackDecodedHeadersAccumulator::OnHeaderDecoded(absl::string_view name,
absl::string_view value) {
QUICHE_DCHECK(!error_detected_);
uncompressed_header_bytes_without_overhead_ += name.size() + value.size();
if (header_list_size_limit_exceeded_) {
return;
}
uncompressed_header_bytes_including_overhead_ +=
name.size() + value.size() + kQpackEntrySizeOverhead;
const size_t uncompressed_header_bytes =
GetQuicFlag(FLAGS_quic_header_size_limit_includes_overhead)
? uncompressed_header_bytes_including_overhead_
: uncompressed_header_bytes_without_overhead_;
if (uncompressed_header_bytes > max_header_list_size_) {
header_list_size_limit_exceeded_ = true;
quic_header_list_.Clear();
} else {
quic_header_list_.OnHeader(name, value);
}
}
void QpackDecodedHeadersAccumulator::OnDecodingCompleted() {
QUICHE_DCHECK(!headers_decoded_);
QUICHE_DCHECK(!error_detected_);
headers_decoded_ = true;
quic_header_list_.OnHeaderBlockEnd(
uncompressed_header_bytes_without_overhead_, compressed_header_bytes_);
// Might destroy |this|.
visitor_->OnHeadersDecoded(std::move(quic_header_list_),
header_list_size_limit_exceeded_);
}
void QpackDecodedHeadersAccumulator::OnDecodingErrorDetected(
QuicErrorCode error_code, absl::string_view error_message) {
QUICHE_DCHECK(!error_detected_);
QUICHE_DCHECK(!headers_decoded_);
error_detected_ = true;
// Might destroy |this|.
visitor_->OnHeaderDecodingError(error_code, error_message);
}
void QpackDecodedHeadersAccumulator::Decode(absl::string_view data) {
QUICHE_DCHECK(!error_detected_);
compressed_header_bytes_ += data.size();
// Might destroy |this|.
decoder_->Decode(data);
}
void QpackDecodedHeadersAccumulator::EndHeaderBlock() {
QUICHE_DCHECK(!error_detected_);
QUICHE_DCHECK(!headers_decoded_);
if (!decoder_) {
QUIC_BUG(b215142466_EndHeaderBlock);
return;
}
// Might destroy |this|.
decoder_->EndHeaderBlock();
}
} // namespace quic
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