blob: 8085f70361aae5d4ccfbed47efea0598071eaea0 [file] [log] [blame]
// 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/window_update_payload_decoder.h"
#include "http2/decoder/decode_buffer.h"
#include "http2/decoder/decode_http2_structures.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 WindowUpdatePayloadDecoder::StartDecodingPayload(
FrameDecoderState* state,
DecodeBuffer* db) {
const Http2FrameHeader& frame_header = state->frame_header();
const uint32_t total_length = frame_header.payload_length;
HTTP2_DVLOG(2) << "WindowUpdatePayloadDecoder::StartDecodingPayload: "
<< frame_header;
DCHECK_EQ(Http2FrameType::WINDOW_UPDATE, frame_header.type);
DCHECK_LE(db->Remaining(), total_length);
// WINDOW_UPDATE frames have no flags.
DCHECK_EQ(0, frame_header.flags);
// Special case for when the payload is the correct size and entirely in
// the buffer.
if (db->Remaining() == Http2WindowUpdateFields::EncodedSize() &&
total_length == Http2WindowUpdateFields::EncodedSize()) {
DoDecode(&window_update_fields_, db);
state->listener()->OnWindowUpdate(
frame_header, window_update_fields_.window_size_increment);
return DecodeStatus::kDecodeDone;
}
state->InitializeRemainders();
return HandleStatus(state, state->StartDecodingStructureInPayload(
&window_update_fields_, db));
}
DecodeStatus WindowUpdatePayloadDecoder::ResumeDecodingPayload(
FrameDecoderState* state,
DecodeBuffer* db) {
HTTP2_DVLOG(2) << "ResumeDecodingPayload: remaining_payload="
<< state->remaining_payload()
<< "; db->Remaining=" << db->Remaining();
DCHECK_EQ(Http2FrameType::WINDOW_UPDATE, state->frame_header().type);
DCHECK_LE(db->Remaining(), state->frame_header().payload_length);
return HandleStatus(state, state->ResumeDecodingStructureInPayload(
&window_update_fields_, db));
}
DecodeStatus WindowUpdatePayloadDecoder::HandleStatus(FrameDecoderState* state,
DecodeStatus status) {
HTTP2_DVLOG(2) << "HandleStatus: status=" << status
<< "; remaining_payload=" << state->remaining_payload();
if (status == DecodeStatus::kDecodeDone) {
if (state->remaining_payload() == 0) {
state->listener()->OnWindowUpdate(
state->frame_header(), window_update_fields_.window_size_increment);
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.
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