raklib\server\Session::handlePacket PHP Метод

    public function handlePacket(Packet $packet)
    {
        $this->isActive = true;
        $this->lastUpdate = microtime(true);
        if ($this->state === self::STATE_CONNECTED or $this->state === self::STATE_CONNECTING_2) {
            if ($packet::$ID >= 0x80 and $packet::$ID <= 0x8f and $packet instanceof DataPacket) {
                //Data packet
                $packet->decode();
                if ($packet->seqNumber < $this->windowStart or $packet->seqNumber > $this->windowEnd or isset($this->receivedWindow[$packet->seqNumber])) {
                    return;
                }
                $diff = $packet->seqNumber - $this->lastSeqNumber;
                unset($this->NACKQueue[$packet->seqNumber]);
                $this->ACKQueue[$packet->seqNumber] = $packet->seqNumber;
                $this->receivedWindow[$packet->seqNumber] = $packet->seqNumber;
                if ($diff !== 1) {
                    for ($i = $this->lastSeqNumber + 1; $i < $packet->seqNumber; ++$i) {
                        if (!isset($this->receivedWindow[$i])) {
                            $this->NACKQueue[$i] = $i;
                        }
                    }
                }
                if ($diff >= 1) {
                    $this->lastSeqNumber = $packet->seqNumber;
                    $this->windowStart += $diff;
                    $this->windowEnd += $diff;
                }
                foreach ($packet->packets as $pk) {
                    $this->handleEncapsulatedPacket($pk);
                }
            } else {
                if ($packet instanceof ACK) {
                    $packet->decode();
                    foreach ($packet->packets as $seq) {
                        if (isset($this->recoveryQueue[$seq])) {
                            foreach ($this->recoveryQueue[$seq]->packets as $pk) {
                                if ($pk instanceof EncapsulatedPacket and $pk->needACK and $pk->messageIndex !== null) {
                                    unset($this->needACK[$pk->identifierACK][$pk->messageIndex]);
                                }
                            }
                            unset($this->recoveryQueue[$seq]);
                        }
                    }
                } elseif ($packet instanceof NACK) {
                    $packet->decode();
                    foreach ($packet->packets as $seq) {
                        if (isset($this->recoveryQueue[$seq])) {
                            $pk = $this->recoveryQueue[$seq];
                            $pk->seqNumber = $this->sendSeqNumber++;
                            $this->packetToSend[] = $pk;
                            unset($this->recoveryQueue[$seq]);
                        }
                    }
                }
            }
        } elseif ($packet::$ID > 0x0 and $packet::$ID < 0x80) {
            //Not Data packet :)
            $packet->decode();
            if ($packet instanceof OPEN_CONNECTION_REQUEST_1) {
                $packet->protocol;
                //TODO: check protocol number and refuse connections
                $pk = new OPEN_CONNECTION_REPLY_1();
                $pk->mtuSize = $packet->mtuSize;
                $pk->serverID = $this->sessionManager->getID();
                $this->sendPacket($pk);
                $this->state = self::STATE_CONNECTING_1;
            } elseif ($this->state === self::STATE_CONNECTING_1 and $packet instanceof OPEN_CONNECTION_REQUEST_2) {
                $this->id = $packet->clientID;
                if ($packet->serverPort === $this->sessionManager->getPort() or !$this->sessionManager->portChecking) {
                    $this->mtuSize = min(abs($packet->mtuSize), 1432);
                    //MTU — (Max IP Header Size) — (UDP Header Size) = 1500 — 60 — 8 = 1432
                    $pk = new OPEN_CONNECTION_REPLY_2();
                    $pk->mtuSize = $this->mtuSize;
                    $pk->serverID = $this->sessionManager->getID();
                    $pk->clientAddress = $this->address;
                    $pk->clientPort = $this->port;
                    $this->sendPacket($pk);
                    $this->state = self::STATE_CONNECTING_2;
                }
            }
        }
    }