Datagram.php

<?php
 
/*
 * This file is part of RakLib.
 * Copyright (C) 2014-2022 PocketMine Team <https://github.com/pmmp/RakLib>
 *
 * RakLib is not affiliated with Jenkins Software LLC nor RakNet.
 *
 * RakLib is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 */
 
declare(strict_types=1);
 
namespace raklib\protocol;
 
class Datagram extends Packet{
    public const BITFLAG_VALID = 0x80;
    public const BITFLAG_ACK = 0x40;
    public const BITFLAG_NAK = 0x20; // hasBAndAS for ACKs
 
    /*
     * These flags can be set on regular datagrams, but they are useless as per the public version of RakNet
     * (the receiving client will not use them or pay any attention to them).
     */
    public const BITFLAG_PACKET_PAIR = 0x10;
    public const BITFLAG_CONTINUOUS_SEND = 0x08;
    public const BITFLAG_NEEDS_B_AND_AS = 0x04;
 
    public const HEADER_SIZE = 1 + 3; //header flags (1) + sequence number (3)
 
    public int $headerFlags = 0;
    public array $packets = [];
    public int $seqNumber;
 
    protected function encodeHeader(PacketSerializer $out) : void{
        $out->putByte(self::BITFLAG_VALID | $this->headerFlags);
    }
 
    protected function encodePayload(PacketSerializer $out) : void{
        $out->putLTriad($this->seqNumber);
        foreach($this->packets as $packet){
            $out->put($packet->toBinary());
        }
    }
 
    public function length(){
        $length = self::HEADER_SIZE;
        foreach($this->packets as $packet){
            $length += $packet->getTotalLength();
        }
 
        return $length;
    }
 
    protected function decodeHeader(PacketSerializer $in) : void{
        $this->headerFlags = $in->getByte();
    }
 
    protected function decodePayload(PacketSerializer $in) : void{
        $this->seqNumber = $in->getLTriad();
 
        while(!$in->feof()){
            $this->packets[] = EncapsulatedPacket::fromBinary($in);
        }
    }
}