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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/window_update_payload_decoder.h" | |
6 | |
7 #include "base/logging.h" | |
8 #include "net/http2/decoder/decode_buffer.h" | |
9 #include "net/http2/decoder/decode_http2_structures.h" | |
10 #include "net/http2/decoder/http2_frame_decoder_listener.h" | |
11 #include "net/http2/http2_constants.h" | |
12 #include "net/http2/http2_structures.h" | |
13 | |
14 namespace net { | |
15 | |
16 DecodeStatus WindowUpdatePayloadDecoder::StartDecodingPayload( | |
17 FrameDecoderState* state, | |
18 DecodeBuffer* db) { | |
19 const Http2FrameHeader& frame_header = state->frame_header(); | |
20 const uint32_t total_length = frame_header.payload_length; | |
21 | |
22 DVLOG(2) << "WindowUpdatePayloadDecoder::StartDecodingPayload: " | |
23 << frame_header; | |
24 | |
25 DCHECK_EQ(Http2FrameType::WINDOW_UPDATE, frame_header.type); | |
26 DCHECK_LE(db->Remaining(), total_length); | |
27 | |
28 // WINDOW_UPDATE frames have no flags. | |
29 DCHECK_EQ(0, frame_header.flags); | |
30 | |
31 // Special case for when the payload is the correct size and entirely in | |
32 // the buffer. | |
33 if (db->Remaining() == Http2WindowUpdateFields::EncodedSize() && | |
34 total_length == Http2WindowUpdateFields::EncodedSize()) { | |
35 DoDecode(&window_update_fields_, db); | |
36 state->listener()->OnWindowUpdate( | |
37 frame_header, window_update_fields_.window_size_increment); | |
38 return DecodeStatus::kDecodeDone; | |
39 } | |
40 state->InitializeRemainders(); | |
41 return HandleStatus(state, state->StartDecodingStructureInPayload( | |
42 &window_update_fields_, db)); | |
43 } | |
44 | |
45 DecodeStatus WindowUpdatePayloadDecoder::ResumeDecodingPayload( | |
46 FrameDecoderState* state, | |
47 DecodeBuffer* db) { | |
48 DVLOG(2) << "ResumeDecodingPayload: remaining_payload=" | |
49 << state->remaining_payload() | |
50 << "; db->Remaining=" << db->Remaining(); | |
51 DCHECK_EQ(Http2FrameType::WINDOW_UPDATE, state->frame_header().type); | |
52 DCHECK_LE(db->Remaining(), state->frame_header().payload_length); | |
53 return HandleStatus(state, state->ResumeDecodingStructureInPayload( | |
54 &window_update_fields_, db)); | |
55 } | |
56 | |
57 DecodeStatus WindowUpdatePayloadDecoder::HandleStatus(FrameDecoderState* state, | |
58 DecodeStatus status) { | |
59 DVLOG(2) << "HandleStatus: status=" << status | |
60 << "; remaining_payload=" << state->remaining_payload(); | |
61 if (status == DecodeStatus::kDecodeDone) { | |
62 if (state->remaining_payload() == 0) { | |
63 state->listener()->OnWindowUpdate( | |
64 state->frame_header(), window_update_fields_.window_size_increment); | |
65 return DecodeStatus::kDecodeDone; | |
66 } | |
67 // Payload is too long. | |
68 return state->ReportFrameSizeError(); | |
69 } | |
70 // Not done decoding the structure. Either we've got more payload to decode, | |
71 // or we've run out because the payload is too short, in which case | |
72 // OnFrameSizeError will have already been called. | |
73 DCHECK( | |
74 (status == DecodeStatus::kDecodeInProgress && | |
75 state->remaining_payload() > 0) || | |
76 (status == DecodeStatus::kDecodeError && state->remaining_payload() == 0)) | |
77 << "\n status=" << status | |
78 << "; remaining_payload=" << state->remaining_payload(); | |
79 return status; | |
80 } | |
81 | |
82 } // namespace net | |
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