1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "http2/decoder/payload_decoders/priority_payload_decoder.h"
#include "http2/decoder/decode_buffer.h"
#include "http2/decoder/http2_frame_decoder_listener.h"
#include "http2/http2_constants.h"
#include "http2/http2_structures.h"
#include "http2/platform/api/http2_logging.h"
namespace http2 {
DecodeStatus PriorityPayloadDecoder::StartDecodingPayload(
FrameDecoderState* state,
DecodeBuffer* db) {
HTTP2_DVLOG(2) << "PriorityPayloadDecoder::StartDecodingPayload: "
<< state->frame_header();
QUICHE_DCHECK_EQ(Http2FrameType::PRIORITY, state->frame_header().type);
QUICHE_DCHECK_LE(db->Remaining(), state->frame_header().payload_length);
// PRIORITY frames have no flags.
QUICHE_DCHECK_EQ(0, state->frame_header().flags);
state->InitializeRemainders();
return HandleStatus(
state, state->StartDecodingStructureInPayload(&priority_fields_, db));
}
DecodeStatus PriorityPayloadDecoder::ResumeDecodingPayload(
FrameDecoderState* state,
DecodeBuffer* db) {
HTTP2_DVLOG(2) << "PriorityPayloadDecoder::ResumeDecodingPayload"
<< " remaining_payload=" << state->remaining_payload()
<< " db->Remaining=" << db->Remaining();
QUICHE_DCHECK_EQ(Http2FrameType::PRIORITY, state->frame_header().type);
QUICHE_DCHECK_LE(db->Remaining(), state->frame_header().payload_length);
return HandleStatus(
state, state->ResumeDecodingStructureInPayload(&priority_fields_, db));
}
DecodeStatus PriorityPayloadDecoder::HandleStatus(FrameDecoderState* state,
DecodeStatus status) {
if (status == DecodeStatus::kDecodeDone) {
if (state->remaining_payload() == 0) {
state->listener()->OnPriorityFrame(state->frame_header(),
priority_fields_);
return DecodeStatus::kDecodeDone;
}
// Payload is too long.
return state->ReportFrameSizeError();
}
// Not done decoding the structure. Either we've got more payload to decode,
// or we've run out because the payload is too short, in which case
// OnFrameSizeError will have already been called.
QUICHE_DCHECK(
(status == DecodeStatus::kDecodeInProgress &&
state->remaining_payload() > 0) ||
(status == DecodeStatus::kDecodeError && state->remaining_payload() == 0))
<< "\n status=" << status
<< "; remaining_payload=" << state->remaining_payload();
return status;
}
} // namespace http2
|
