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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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