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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/settings_payload_decoder.h" |
| 6 |
| 7 #include "base/logging.h" |
| 8 #include "net/http2/decoder/decode_buffer.h" |
| 9 #include "net/http2/decoder/http2_frame_decoder_listener.h" |
| 10 #include "net/http2/http2_constants.h" |
| 11 #include "net/http2/http2_structures.h" |
| 12 |
| 13 namespace net { |
| 14 |
| 15 DecodeStatus SettingsPayloadDecoder::StartDecodingPayload( |
| 16 FrameDecoderState* state, |
| 17 DecodeBuffer* db) { |
| 18 const Http2FrameHeader& frame_header = state->frame_header(); |
| 19 const uint32_t total_length = frame_header.payload_length; |
| 20 |
| 21 DVLOG(2) << "SettingsPayloadDecoder::StartDecodingPayload: " << frame_header; |
| 22 DCHECK_EQ(Http2FrameType::SETTINGS, frame_header.type); |
| 23 DCHECK_LE(db->Remaining(), total_length); |
| 24 DCHECK_EQ(0, frame_header.flags & ~(Http2FrameFlag::FLAG_ACK)); |
| 25 |
| 26 if (frame_header.IsAck()) { |
| 27 if (total_length == 0) { |
| 28 state->listener()->OnSettingsAck(frame_header); |
| 29 return DecodeStatus::kDecodeDone; |
| 30 } else { |
| 31 state->InitializeRemainders(); |
| 32 return state->ReportFrameSizeError(); |
| 33 } |
| 34 } else { |
| 35 state->InitializeRemainders(); |
| 36 state->listener()->OnSettingsStart(frame_header); |
| 37 return StartDecodingSettings(state, db); |
| 38 } |
| 39 } |
| 40 |
| 41 DecodeStatus SettingsPayloadDecoder::ResumeDecodingPayload( |
| 42 FrameDecoderState* state, |
| 43 DecodeBuffer* db) { |
| 44 DVLOG(2) << "SettingsPayloadDecoder::ResumeDecodingPayload" |
| 45 << " remaining_payload=" << state->remaining_payload() |
| 46 << " db->Remaining=" << db->Remaining(); |
| 47 DCHECK_EQ(Http2FrameType::SETTINGS, state->frame_header().type); |
| 48 DCHECK_LE(db->Remaining(), state->frame_header().payload_length); |
| 49 |
| 50 DecodeStatus status = |
| 51 state->ResumeDecodingStructureInPayload(&setting_fields_, db); |
| 52 if (status == DecodeStatus::kDecodeDone) { |
| 53 state->listener()->OnSetting(setting_fields_); |
| 54 return StartDecodingSettings(state, db); |
| 55 } |
| 56 return HandleNotDone(state, db, status); |
| 57 } |
| 58 |
| 59 DecodeStatus SettingsPayloadDecoder::StartDecodingSettings( |
| 60 FrameDecoderState* state, |
| 61 DecodeBuffer* db) { |
| 62 DVLOG(2) << "SettingsPayloadDecoder::StartDecodingSettings" |
| 63 << " remaining_payload=" << state->remaining_payload() |
| 64 << " db->Remaining=" << db->Remaining(); |
| 65 while (state->remaining_payload() > 0) { |
| 66 DecodeStatus status = |
| 67 state->StartDecodingStructureInPayload(&setting_fields_, db); |
| 68 if (status == DecodeStatus::kDecodeDone) { |
| 69 state->listener()->OnSetting(setting_fields_); |
| 70 continue; |
| 71 } |
| 72 return HandleNotDone(state, db, status); |
| 73 } |
| 74 DVLOG(2) << "LEAVING SettingsPayloadDecoder::StartDecodingSettings" |
| 75 << "\n\tdb->Remaining=" << db->Remaining() |
| 76 << "\n\t remaining_payload=" << state->remaining_payload(); |
| 77 state->listener()->OnSettingsEnd(); |
| 78 return DecodeStatus::kDecodeDone; |
| 79 } |
| 80 |
| 81 DecodeStatus SettingsPayloadDecoder::HandleNotDone(FrameDecoderState* state, |
| 82 DecodeBuffer* db, |
| 83 DecodeStatus status) { |
| 84 // Not done decoding the structure. Either we've got more payload to decode, |
| 85 // or we've run out because the payload is too short, in which case |
| 86 // OnFrameSizeError will have already been called. |
| 87 DCHECK( |
| 88 (status == DecodeStatus::kDecodeInProgress && |
| 89 state->remaining_payload() > 0) || |
| 90 (status == DecodeStatus::kDecodeError && state->remaining_payload() == 0)) |
| 91 << "\n status=" << status |
| 92 << "; remaining_payload=" << state->remaining_payload() |
| 93 << "; db->Remaining=" << db->Remaining(); |
| 94 return status; |
| 95 } |
| 96 |
| 97 } // namespace net |
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