Source/WebCore/platform/mediastream/RTCDataChannelIdentifier.h

/*
 * Copyright (C) 2021 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 */

#pragma once

#include "ProcessIdentifier.h"
#include <wtf/ObjectIdentifier.h>

namespace WebCore {

enum RTCDataChannelLocalIdentifierType { };
using RTCDataChannelLocalIdentifier = ObjectIdentifier<RTCDataChannelLocalIdentifierType>;
struct RTCDataChannelIdentifier {
    ProcessIdentifier processIdentifier;
    RTCDataChannelLocalIdentifier channelIdentifier;

    template<class Encoder> void encode(Encoder&) const;
    template<class Decoder> static std::optional<RTCDataChannelIdentifier> decode(Decoder&);
};

template<class Encoder>
inline void RTCDataChannelIdentifier::encode(Encoder& encoder) const
{
    encoder << processIdentifier << channelIdentifier;
}

template<class Decoder>
inline std::optional<RTCDataChannelIdentifier> RTCDataChannelIdentifier::decode(Decoder& decoder)
{
    std::optional<ProcessIdentifier> processIdentifier;
    decoder >> processIdentifier;
    if (!processIdentifier)
        return std::nullopt;

    std::optional<RTCDataChannelLocalIdentifier> channelIdentifier;
    decoder >> channelIdentifier;
    if (!channelIdentifier)
        return std::nullopt;
    return RTCDataChannelIdentifier { *processIdentifier, *channelIdentifier };
}

} // namespace WebCore