chromium/net/third_party/quiche/src/quiche/quic/core/quic_stream_priority.h

// Copyright 2022 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_QUIC_CORE_QUIC_STREAM_PRIORITY_H_
#define QUICHE_QUIC_CORE_QUIC_STREAM_PRIORITY_H_

#include <cstdint>
#include <optional>
#include <string>
#include <tuple>

#include "absl/strings/string_view.h"
#include "absl/types/variant.h"
#include "quiche/quic/core/quic_types.h"
#include "quiche/common/platform/api/quiche_bug_tracker.h"
#include "quiche/common/platform/api/quiche_export.h"
#include "quiche/web_transport/web_transport.h"

namespace quic {

// Represents HTTP priorities as defined by RFC 9218.
struct QUICHE_EXPORT HttpStreamPriority { … };

// Represents the priorities of WebTransport nested data streams as defined in
// <https://w3c.github.io/webtransport/>.
struct QUICHE_EXPORT WebTransportStreamPriority { … };

// A class that wraps different types of priorities that can be used for
// scheduling QUIC streams.
class QUICHE_EXPORT QuicStreamPriority { … };

// Serializes the Priority Field Value for a PRIORITY_UPDATE frame.
QUICHE_EXPORT std::string SerializePriorityFieldValue(
    HttpStreamPriority priority);

// Parses the Priority Field Value field of a PRIORITY_UPDATE frame.
// Returns nullopt on failure.
QUICHE_EXPORT std::optional<HttpStreamPriority> ParsePriorityFieldValue(
    absl::string_view priority_field_value);

}  // namespace quic

#endif  // QUICHE_QUIC_CORE_QUIC_STREAM_PRIORITY_H_