////  ControlPacket.h//  libraries/networking/src/udt////  Created by Stephen Birarda on 2015-07-24.//  Copyright 2015 High Fidelity, Inc.//  Copyright 2021 Vircadia contributors.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// #pragma once #ifndef hifi_ControlPacket_h#define hifi_ControlPacket_h #include <vector> #include "BasePacket.h"#include "Packet.h" namespace udt {    class ControlPacket : public BasePacket {    Q_OBJECTpublic:    using ControlBitAndType = uint32_t;        enum Type : uint16_t {        ACK,        Handshake,        HandshakeACK,        HandshakeRequest    };        static std::unique_ptr<ControlPacket> create(Type type, qint64 size = -1);    static std::unique_ptr<ControlPacket> fromReceivedPacket(std::unique_ptr<char[]> data, qint64 size,                                                             const SockAddr& senderSockAddr);    // Current level's header size    static int localHeaderSize();    // Cumulated size of all the headers    static int totalHeaderSize();    // The maximum payload size this packet can use to fit in MTU    static int maxPayloadSize();        Type getType() const { return _type; }    void setType(Type type);    private:    Q_DISABLE_COPY(ControlPacket)    ControlPacket(Type type, qint64 size = -1);    ControlPacket(std::unique_ptr<char[]> data, qint64 size, const SockAddr& senderSockAddr);    ControlPacket(ControlPacket&& other);        ControlPacket& operator=(ControlPacket&& other);        // Header read/write    void readType();    void writeType();        Type _type;};    } // namespace udt  #endif // hifi_ControlPacket_h