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1 // Copyright 2016 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 "net/http2/decoder/payload_decoders/data_payload_decoder.h" | |
6 | |
7 #include <stddef.h> | |
8 | |
9 #include "base/logging.h" | |
10 #include "base/macros.h" | |
11 #include "net/http2/decoder/decode_buffer.h" | |
12 #include "net/http2/decoder/http2_frame_decoder_listener.h" | |
13 #include "net/http2/http2_constants.h" | |
14 #include "net/http2/http2_structures.h" | |
15 #include "net/http2/tools/http2_bug_tracker.h" | |
16 | |
17 namespace net { | |
18 | |
19 std::ostream& operator<<(std::ostream& out, | |
20 DataPayloadDecoder::PayloadState v) { | |
21 switch (v) { | |
22 case DataPayloadDecoder::PayloadState::kReadPadLength: | |
23 return out << "kReadPadLength"; | |
24 case DataPayloadDecoder::PayloadState::kReadPayload: | |
25 return out << "kReadPayload"; | |
26 case DataPayloadDecoder::PayloadState::kSkipPadding: | |
27 return out << "kSkipPadding"; | |
28 } | |
29 return out << static_cast<int>(v); | |
30 } | |
31 | |
32 DecodeStatus DataPayloadDecoder::StartDecodingPayload(FrameDecoderState* state, | |
33 DecodeBuffer* db) { | |
34 const Http2FrameHeader& frame_header = state->frame_header(); | |
35 const uint32_t total_length = frame_header.payload_length; | |
36 | |
37 DVLOG(2) << "DataPayloadDecoder::StartDecodingPayload: " << frame_header; | |
38 DCHECK_EQ(Http2FrameType::DATA, frame_header.type); | |
39 DCHECK_LE(db->Remaining(), total_length); | |
40 DCHECK_EQ( | |
41 0, frame_header.flags & | |
42 ~(Http2FrameFlag::FLAG_END_STREAM | Http2FrameFlag::FLAG_PADDED)); | |
43 | |
44 // Special case for the hoped for common case: unpadded and fits fully into | |
45 // the decode buffer. TO BE SEEN if that is true. It certainly requires that | |
46 // the transport buffers be large (e.g. >> 16KB typically). | |
47 // TODO(jamessynge) Add counters. | |
48 DVLOG(2) << "StartDecodingPayload total_length=" << total_length; | |
49 if (!frame_header.IsPadded()) { | |
50 DVLOG(2) << "StartDecodingPayload !IsPadded"; | |
51 if (db->Remaining() == total_length) { | |
52 DVLOG(2) << "StartDecodingPayload all present"; | |
53 // Note that we don't cache the listener field so that the callee can | |
54 // replace it if the frame is bad. | |
55 // If this case is common enough, consider combining the 3 callbacks | |
56 // into one. | |
57 state->listener()->OnDataStart(frame_header); | |
58 if (total_length > 0) { | |
59 state->listener()->OnDataPayload(db->cursor(), total_length); | |
60 db->AdvanceCursor(total_length); | |
61 } | |
62 state->listener()->OnDataEnd(); | |
63 return DecodeStatus::kDecodeDone; | |
64 } | |
65 payload_state_ = PayloadState::kReadPayload; | |
66 } else { | |
67 payload_state_ = PayloadState::kReadPadLength; | |
68 } | |
69 state->InitializeRemainders(); | |
70 state->listener()->OnDataStart(frame_header); | |
71 return ResumeDecodingPayload(state, db); | |
72 } | |
73 | |
74 DecodeStatus DataPayloadDecoder::ResumeDecodingPayload(FrameDecoderState* state, | |
75 DecodeBuffer* db) { | |
76 DVLOG(2) << "DataPayloadDecoder::ResumeDecodingPayload payload_state_=" | |
77 << payload_state_; | |
78 const Http2FrameHeader& frame_header = state->frame_header(); | |
79 DCHECK_EQ(Http2FrameType::DATA, frame_header.type); | |
80 DCHECK_LE(state->remaining_payload_and_padding(), | |
81 frame_header.payload_length); | |
82 DCHECK_LE(db->Remaining(), state->remaining_payload_and_padding()); | |
83 DecodeStatus status; | |
84 size_t avail; | |
85 switch (payload_state_) { | |
86 case PayloadState::kReadPadLength: | |
87 // ReadPadLength handles the OnPadLength callback, and updating the | |
88 // remaining_payload and remaining_padding fields. If the amount of | |
89 // padding is too large to fit in the frame's payload, ReadPadLength | |
90 // instead calls OnPaddingTooLong and returns kDecodeError. | |
91 status = state->ReadPadLength(db, /*report_pad_length*/ true); | |
92 if (status != DecodeStatus::kDecodeDone) { | |
93 return status; | |
94 } | |
95 // FALLTHROUGH_INTENDED | |
96 | |
97 case PayloadState::kReadPayload: | |
98 avail = state->AvailablePayload(db); | |
99 if (avail > 0) { | |
100 state->listener()->OnDataPayload(db->cursor(), avail); | |
101 db->AdvanceCursor(avail); | |
102 state->ConsumePayload(avail); | |
103 } | |
104 if (state->remaining_payload() > 0) { | |
105 payload_state_ = PayloadState::kReadPayload; | |
106 return DecodeStatus::kDecodeInProgress; | |
107 } | |
108 // FALLTHROUGH_INTENDED | |
109 | |
110 case PayloadState::kSkipPadding: | |
111 // SkipPadding handles the OnPadding callback. | |
112 if (state->SkipPadding(db)) { | |
113 state->listener()->OnDataEnd(); | |
114 return DecodeStatus::kDecodeDone; | |
115 } | |
116 payload_state_ = PayloadState::kSkipPadding; | |
117 return DecodeStatus::kDecodeInProgress; | |
118 } | |
119 HTTP2_BUG << "PayloadState: " << payload_state_; | |
120 return DecodeStatus::kDecodeError; | |
121 } | |
122 | |
123 } // namespace net | |
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