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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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