1 // Copyright (c) 2019 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "quiche/quic/core/qpack/qpack_decoded_headers_accumulator.h"
6
7 #include "absl/strings/string_view.h"
8 #include "quiche/quic/core/qpack/qpack_decoder.h"
9 #include "quiche/quic/core/qpack/qpack_header_table.h"
10 #include "quiche/quic/platform/api/quic_bug_tracker.h"
11 #include "quiche/quic/platform/api/quic_flags.h"
12
13 namespace quic {
14
QpackDecodedHeadersAccumulator(QuicStreamId id,QpackDecoder * qpack_decoder,Visitor * visitor,size_t max_header_list_size)15 QpackDecodedHeadersAccumulator::QpackDecodedHeadersAccumulator(
16 QuicStreamId id, QpackDecoder* qpack_decoder, Visitor* visitor,
17 size_t max_header_list_size)
18 : decoder_(qpack_decoder->CreateProgressiveDecoder(id, this)),
19 visitor_(visitor),
20 max_header_list_size_(max_header_list_size),
21 uncompressed_header_bytes_including_overhead_(0),
22 uncompressed_header_bytes_without_overhead_(0),
23 compressed_header_bytes_(0),
24 header_list_size_limit_exceeded_(false),
25 headers_decoded_(false),
26 error_detected_(false) {
27 quic_header_list_.OnHeaderBlockStart();
28 }
29
OnHeaderDecoded(absl::string_view name,absl::string_view value)30 void QpackDecodedHeadersAccumulator::OnHeaderDecoded(absl::string_view name,
31 absl::string_view value) {
32 QUICHE_DCHECK(!error_detected_);
33
34 uncompressed_header_bytes_without_overhead_ += name.size() + value.size();
35
36 if (header_list_size_limit_exceeded_) {
37 return;
38 }
39
40 uncompressed_header_bytes_including_overhead_ +=
41 name.size() + value.size() + kQpackEntrySizeOverhead;
42
43 const size_t uncompressed_header_bytes =
44 GetQuicFlag(quic_header_size_limit_includes_overhead)
45 ? uncompressed_header_bytes_including_overhead_
46 : uncompressed_header_bytes_without_overhead_;
47 if (uncompressed_header_bytes > max_header_list_size_) {
48 header_list_size_limit_exceeded_ = true;
49 }
50 quic_header_list_.OnHeader(name, value);
51 }
52
OnDecodingCompleted()53 void QpackDecodedHeadersAccumulator::OnDecodingCompleted() {
54 QUICHE_DCHECK(!headers_decoded_);
55 QUICHE_DCHECK(!error_detected_);
56
57 headers_decoded_ = true;
58
59 quic_header_list_.OnHeaderBlockEnd(
60 uncompressed_header_bytes_without_overhead_, compressed_header_bytes_);
61
62 // Might destroy |this|.
63 visitor_->OnHeadersDecoded(std::move(quic_header_list_),
64 header_list_size_limit_exceeded_);
65 }
66
OnDecodingErrorDetected(QuicErrorCode error_code,absl::string_view error_message)67 void QpackDecodedHeadersAccumulator::OnDecodingErrorDetected(
68 QuicErrorCode error_code, absl::string_view error_message) {
69 QUICHE_DCHECK(!error_detected_);
70 QUICHE_DCHECK(!headers_decoded_);
71
72 error_detected_ = true;
73 // Might destroy |this|.
74 visitor_->OnHeaderDecodingError(error_code, error_message);
75 }
76
Decode(absl::string_view data)77 void QpackDecodedHeadersAccumulator::Decode(absl::string_view data) {
78 QUICHE_DCHECK(!error_detected_);
79
80 compressed_header_bytes_ += data.size();
81 // Might destroy |this|.
82 decoder_->Decode(data);
83 }
84
EndHeaderBlock()85 void QpackDecodedHeadersAccumulator::EndHeaderBlock() {
86 QUICHE_DCHECK(!error_detected_);
87 QUICHE_DCHECK(!headers_decoded_);
88
89 if (!decoder_) {
90 QUIC_BUG(b215142466_EndHeaderBlock);
91 return;
92 }
93
94 // Might destroy |this|.
95 decoder_->EndHeaderBlock();
96 }
97
98 } // namespace quic
99