| // 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 "quiche/http2/decoder/payload_decoders/settings_payload_decoder.h" |
| |
| #include "quiche/http2/decoder/decode_buffer.h" |
| #include "quiche/http2/decoder/http2_frame_decoder_listener.h" |
| #include "quiche/http2/http2_constants.h" |
| #include "quiche/http2/http2_structures.h" |
| #include "quiche/common/platform/api/quiche_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; |
| |
| QUICHE_DVLOG(2) << "SettingsPayloadDecoder::StartDecodingPayload: " |
| << frame_header; |
| QUICHE_DCHECK_EQ(Http2FrameType::SETTINGS, frame_header.type); |
| QUICHE_DCHECK_LE(db->Remaining(), total_length); |
| QUICHE_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) { |
| QUICHE_DVLOG(2) << "SettingsPayloadDecoder::ResumeDecodingPayload" |
| << " remaining_payload=" << state->remaining_payload() |
| << " db->Remaining=" << db->Remaining(); |
| QUICHE_DCHECK_EQ(Http2FrameType::SETTINGS, state->frame_header().type); |
| QUICHE_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) { |
| QUICHE_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); |
| } |
| QUICHE_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. |
| QUICHE_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 |