| // 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/window_update_payload_decoder.h" |
| |
| #include "quiche/http2/decoder/decode_buffer.h" |
| #include "quiche/http2/decoder/decode_http2_structures.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 WindowUpdatePayloadDecoder::StartDecodingPayload( |
| FrameDecoderState* state, DecodeBuffer* db) { |
| const Http2FrameHeader& frame_header = state->frame_header(); |
| const uint32_t total_length = frame_header.payload_length; |
| |
| QUICHE_DVLOG(2) << "WindowUpdatePayloadDecoder::StartDecodingPayload: " |
| << frame_header; |
| |
| QUICHE_DCHECK_EQ(Http2FrameType::WINDOW_UPDATE, frame_header.type); |
| QUICHE_DCHECK_LE(db->Remaining(), total_length); |
| |
| // WINDOW_UPDATE frames have no flags. |
| QUICHE_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) { |
| QUICHE_DVLOG(2) << "ResumeDecodingPayload: remaining_payload=" |
| << state->remaining_payload() |
| << "; db->Remaining=" << db->Remaining(); |
| QUICHE_DCHECK_EQ(Http2FrameType::WINDOW_UPDATE, state->frame_header().type); |
| QUICHE_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) { |
| QUICHE_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. |
| 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 |