mirror of
https://github.com/pmmp/BedrockProtocol.git
synced 2025-08-11 04:32:58 +00:00
117 lines
3.2 KiB
PHP
117 lines
3.2 KiB
PHP
<?php
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/*
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* This file is part of BedrockProtocol.
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* Copyright (C) 2014-2022 PocketMine Team <https://github.com/pmmp/BedrockProtocol>
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*
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* BedrockProtocol is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*/
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declare(strict_types=1);
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namespace pocketmine\network\mcpe\protocol;
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use pocketmine\network\mcpe\protocol\serializer\PacketSerializer;
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use pocketmine\utils\BinaryDataException;
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use function get_class;
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abstract class DataPacket implements Packet{
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public const NETWORK_ID = 0;
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public const PID_MASK = 0x3ff; //10 bits
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private const SUBCLIENT_ID_MASK = 0x03; //2 bits
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private const SENDER_SUBCLIENT_ID_SHIFT = 10;
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private const RECIPIENT_SUBCLIENT_ID_SHIFT = 12;
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public int $senderSubId = 0;
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public int $recipientSubId = 0;
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public function pid() : int{
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return $this::NETWORK_ID;
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}
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public function getName() : string{
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return (new \ReflectionClass($this))->getShortName();
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}
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public function canBeSentBeforeLogin() : bool{
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return false;
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}
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/**
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* @throws PacketDecodeException
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*/
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final public function decode(PacketSerializer $in) : void{
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try{
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$this->decodeHeader($in);
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$this->decodePayload($in);
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}catch(BinaryDataException | PacketDecodeException $e){
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throw PacketDecodeException::wrap($e, $this->getName());
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}
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}
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/**
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* @throws BinaryDataException
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* @throws PacketDecodeException
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*/
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protected function decodeHeader(PacketSerializer $in) : void{
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$header = $in->getUnsignedVarInt();
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$pid = $header & self::PID_MASK;
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if($pid !== static::NETWORK_ID){
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//TODO: this means a logical error in the code, but how to prevent it from happening?
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throw new PacketDecodeException("Expected " . static::NETWORK_ID . " for packet ID, got $pid");
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}
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$this->senderSubId = ($header >> self::SENDER_SUBCLIENT_ID_SHIFT) & self::SUBCLIENT_ID_MASK;
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$this->recipientSubId = ($header >> self::RECIPIENT_SUBCLIENT_ID_SHIFT) & self::SUBCLIENT_ID_MASK;
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}
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/**
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* Decodes the packet body, without the packet ID or other generic header fields.
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*
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* @throws PacketDecodeException
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* @throws BinaryDataException
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*/
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abstract protected function decodePayload(PacketSerializer $in) : void;
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final public function encode(PacketSerializer $out) : void{
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$this->encodeHeader($out);
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$this->encodePayload($out);
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}
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protected function encodeHeader(PacketSerializer $out) : void{
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$out->putUnsignedVarInt(
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static::NETWORK_ID |
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($this->senderSubId << self::SENDER_SUBCLIENT_ID_SHIFT) |
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($this->recipientSubId << self::RECIPIENT_SUBCLIENT_ID_SHIFT)
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);
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}
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/**
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* Encodes the packet body, without the packet ID or other generic header fields.
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*/
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abstract protected function encodePayload(PacketSerializer $out) : void;
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/**
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* @param string $name
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*
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* @return mixed
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*/
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public function __get($name){
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throw new \Error("Undefined property: " . get_class($this) . "::\$" . $name);
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}
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/**
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* @param string $name
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* @param mixed $value
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*/
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public function __set($name, $value) : void{
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throw new \Error("Undefined property: " . get_class($this) . "::\$" . $name);
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}
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}
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