blob: 1f7d263f4327e262b86adcd21343ef1df65538fa [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/continuation_payload_decoder.h"
#include <stddef.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 ContinuationPayloadDecoder::StartDecodingPayload(
FrameDecoderState* state,
DecodeBuffer* db) {
const Http2FrameHeader& frame_header = state->frame_header();
const uint32_t total_length = frame_header.payload_length;
HTTP2_DVLOG(2) << "ContinuationPayloadDecoder::StartDecodingPayload: "
<< frame_header;
DCHECK_EQ(Http2FrameType::CONTINUATION, frame_header.type);
DCHECK_LE(db->Remaining(), total_length);
DCHECK_EQ(0, frame_header.flags & ~(Http2FrameFlag::END_HEADERS));
state->InitializeRemainders();
state->listener()->OnContinuationStart(frame_header);
return ResumeDecodingPayload(state, db);
}
DecodeStatus ContinuationPayloadDecoder::ResumeDecodingPayload(
FrameDecoderState* state,
DecodeBuffer* db) {
HTTP2_DVLOG(2) << "ContinuationPayloadDecoder::ResumeDecodingPayload"
<< " remaining_payload=" << state->remaining_payload()
<< " db->Remaining=" << db->Remaining();
DCHECK_EQ(Http2FrameType::CONTINUATION, state->frame_header().type);
DCHECK_LE(state->remaining_payload(), state->frame_header().payload_length);
DCHECK_LE(db->Remaining(), state->remaining_payload());
size_t avail = db->Remaining();
DCHECK_LE(avail, state->remaining_payload());
if (avail > 0) {
state->listener()->OnHpackFragment(db->cursor(), avail);
db->AdvanceCursor(avail);
state->ConsumePayload(avail);
}
if (state->remaining_payload() == 0) {
state->listener()->OnContinuationEnd();
return DecodeStatus::kDecodeDone;
}
return DecodeStatus::kDecodeInProgress;
}
} // namespace http2