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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/priority_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 PriorityPayloadDecoder::StartDecodingPayload( |
| 16 FrameDecoderState* state, |
| 17 DecodeBuffer* db) { |
| 18 DVLOG(2) << "PriorityPayloadDecoder::StartDecodingPayload: " |
| 19 << state->frame_header(); |
| 20 DCHECK_EQ(Http2FrameType::PRIORITY, state->frame_header().type); |
| 21 DCHECK_LE(db->Remaining(), state->frame_header().payload_length); |
| 22 // PRIORITY frames have no flags. |
| 23 DCHECK_EQ(0, state->frame_header().flags); |
| 24 state->InitializeRemainders(); |
| 25 return HandleStatus( |
| 26 state, state->StartDecodingStructureInPayload(&priority_fields_, db)); |
| 27 } |
| 28 |
| 29 DecodeStatus PriorityPayloadDecoder::ResumeDecodingPayload( |
| 30 FrameDecoderState* state, |
| 31 DecodeBuffer* db) { |
| 32 DVLOG(2) << "PriorityPayloadDecoder::ResumeDecodingPayload" |
| 33 << " remaining_payload=" << state->remaining_payload() |
| 34 << " db->Remaining=" << db->Remaining(); |
| 35 DCHECK_EQ(Http2FrameType::PRIORITY, state->frame_header().type); |
| 36 DCHECK_LE(db->Remaining(), state->frame_header().payload_length); |
| 37 return HandleStatus( |
| 38 state, state->ResumeDecodingStructureInPayload(&priority_fields_, db)); |
| 39 } |
| 40 |
| 41 DecodeStatus PriorityPayloadDecoder::HandleStatus(FrameDecoderState* state, |
| 42 DecodeStatus status) { |
| 43 if (status == DecodeStatus::kDecodeDone) { |
| 44 if (state->remaining_payload() == 0) { |
| 45 state->listener()->OnPriorityFrame(state->frame_header(), |
| 46 priority_fields_); |
| 47 return DecodeStatus::kDecodeDone; |
| 48 } |
| 49 // Payload is too long. |
| 50 return state->ReportFrameSizeError(); |
| 51 } |
| 52 // Not done decoding the structure. Either we've got more payload to decode, |
| 53 // or we've run out because the payload is too short, in which case |
| 54 // OnFrameSizeError will have already been called. |
| 55 DCHECK( |
| 56 (status == DecodeStatus::kDecodeInProgress && |
| 57 state->remaining_payload() > 0) || |
| 58 (status == DecodeStatus::kDecodeError && state->remaining_payload() == 0)) |
| 59 << "\n status=" << status |
| 60 << "; remaining_payload=" << state->remaining_payload(); |
| 61 return status; |
| 62 } |
| 63 |
| 64 } // namespace net |
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