blob: 5227bc480891deee080f66ff6914501ae154d2ab [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/settings_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 SettingsPayloadDecoder::StartDecodingPayload(
FrameDecoderState* state,
DecodeBuffer* db) {
const Http2FrameHeader& frame_header = state->frame_header();
const uint32_t total_length = frame_header.payload_length;
HTTP2_DVLOG(2) << "SettingsPayloadDecoder::StartDecodingPayload: "
<< frame_header;
DCHECK_EQ(Http2FrameType::SETTINGS, frame_header.type);
DCHECK_LE(db->Remaining(), total_length);
DCHECK_EQ(0, frame_header.flags & ~(Http2FrameFlag::ACK));
if (frame_header.IsAck()) {
if (total_length == 0) {
state->listener()->OnSettingsAck(frame_header);
return DecodeStatus::kDecodeDone;
} else {
state->InitializeRemainders();
return state->ReportFrameSizeError();
}
} else {
state->InitializeRemainders();
state->listener()->OnSettingsStart(frame_header);
return StartDecodingSettings(state, db);
}
}
DecodeStatus SettingsPayloadDecoder::ResumeDecodingPayload(
FrameDecoderState* state,
DecodeBuffer* db) {
HTTP2_DVLOG(2) << "SettingsPayloadDecoder::ResumeDecodingPayload"
<< " remaining_payload=" << state->remaining_payload()
<< " db->Remaining=" << db->Remaining();
DCHECK_EQ(Http2FrameType::SETTINGS, state->frame_header().type);
DCHECK_LE(db->Remaining(), state->frame_header().payload_length);
DecodeStatus status =
state->ResumeDecodingStructureInPayload(&setting_fields_, db);
if (status == DecodeStatus::kDecodeDone) {
state->listener()->OnSetting(setting_fields_);
return StartDecodingSettings(state, db);
}
return HandleNotDone(state, db, status);
}
DecodeStatus SettingsPayloadDecoder::StartDecodingSettings(
FrameDecoderState* state,
DecodeBuffer* db) {
HTTP2_DVLOG(2) << "SettingsPayloadDecoder::StartDecodingSettings"
<< " remaining_payload=" << state->remaining_payload()
<< " db->Remaining=" << db->Remaining();
while (state->remaining_payload() > 0) {
DecodeStatus status =
state->StartDecodingStructureInPayload(&setting_fields_, db);
if (status == DecodeStatus::kDecodeDone) {
state->listener()->OnSetting(setting_fields_);
continue;
}
return HandleNotDone(state, db, status);
}
HTTP2_DVLOG(2) << "LEAVING SettingsPayloadDecoder::StartDecodingSettings"
<< "\n\tdb->Remaining=" << db->Remaining()
<< "\n\t remaining_payload=" << state->remaining_payload();
state->listener()->OnSettingsEnd();
return DecodeStatus::kDecodeDone;
}
DecodeStatus SettingsPayloadDecoder::HandleNotDone(FrameDecoderState* state,
DecodeBuffer* db,
DecodeStatus status) {
// 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()
<< "; db->Remaining=" << db->Remaining();
return status;
}
} // namespace http2