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// Copyright 2020 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.
#ifndef QUICHE_HTTP2_DECODER_PAYLOAD_DECODERS_PRIORITY_UPDATE_PAYLOAD_DECODER_H_
#define QUICHE_HTTP2_DECODER_PAYLOAD_DECODERS_PRIORITY_UPDATE_PAYLOAD_DECODER_H_
// Decodes the payload of a PRIORITY_UPDATE frame.
#include "quiche/http2/decoder/decode_buffer.h"
#include "quiche/http2/decoder/decode_status.h"
#include "quiche/http2/decoder/frame_decoder_state.h"
#include "quiche/http2/http2_structures.h"
#include "quiche/common/platform/api/quiche_export.h"
namespace http2 {
namespace test {
class PriorityUpdatePayloadDecoderPeer;
} // namespace test
class QUICHE_EXPORT_PRIVATE PriorityUpdatePayloadDecoder {
public:
// States during decoding of a PRIORITY_UPDATE frame.
enum class PayloadState {
// At the start of the PRIORITY_UPDATE frame payload, ready to start
// decoding the fixed size fields into priority_update_fields_.
kStartDecodingFixedFields,
// The fixed size fields weren't all available when the decoder first
// tried to decode them; this state resumes the decoding when
// ResumeDecodingPayload is called later.
kResumeDecodingFixedFields,
// Handle the DecodeStatus returned from starting or resuming the decoding
// of Http2PriorityUpdateFields into priority_update_fields_. If complete,
// calls OnPriorityUpdateStart.
kHandleFixedFieldsStatus,
// Report the Priority Field Value portion of the payload to the listener's
// OnPriorityUpdatePayload method, and call OnPriorityUpdateEnd when the end
// of the payload is reached.
kReadPriorityFieldValue,
};
// Starts the decoding of a PRIORITY_UPDATE frame's payload, and completes it
// if the entire payload is in the provided decode buffer.
DecodeStatus StartDecodingPayload(FrameDecoderState* state, DecodeBuffer* db);
// Resumes decoding a PRIORITY_UPDATE frame that has been split across decode
// buffers.
DecodeStatus ResumeDecodingPayload(FrameDecoderState* state,
DecodeBuffer* db);
private:
friend class test::PriorityUpdatePayloadDecoderPeer;
Http2PriorityUpdateFields priority_update_fields_;
PayloadState payload_state_;
};
} // namespace http2
#endif // QUICHE_HTTP2_DECODER_PAYLOAD_DECODERS_PRIORITY_UPDATE_PAYLOAD_DECODER_H_
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