RequestAbilityPacket.php

<?php
 
/*
 * This file is part of BedrockProtocol.
 * Copyright (C) 2014-2022 PocketMine Team <https://github.com/pmmp/BedrockProtocol>
 *
 * BedrockProtocol is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser 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 pocketmine\network\mcpe\protocol;
 
use pmmp\encoding\Byte;
use pmmp\encoding\ByteBufferReader;
use pmmp\encoding\ByteBufferWriter;
use pmmp\encoding\LE;
use pmmp\encoding\VarInt;
use pocketmine\network\mcpe\protocol\serializer\CommonTypes;
use function is_bool;
use function is_float;
 
class RequestAbilityPacket extends DataPacket implements ServerboundPacket{
    public const NETWORK_ID = ProtocolInfo::REQUEST_ABILITY_PACKET;
 
    private const VALUE_TYPE_BOOL = 1;
    private const VALUE_TYPE_FLOAT = 2;
 
    public const ABILITY_FLYING = 9;
    public const ABILITY_NOCLIP = 17;
 
    private int $abilityId;
    private float|bool $abilityValue;
 
    public static function create(int $abilityId, float|bool $abilityValue) : self{
        $result = new self;
        $result->abilityId = $abilityId;
        $result->abilityValue = $abilityValue;
        return $result;
    }
 
    public function getAbilityId() : int{ return $this->abilityId; }
 
    public function getAbilityValue() : float|bool{ return $this->abilityValue; }
 
    protected function decodePayload(ByteBufferReader $in) : void{
        $this->abilityId = VarInt::readSignedInt($in);
 
        $valueType = Byte::readUnsigned($in);
 
        //what is the point of having a type ID if you just write all the types anyway ??? mojang ...
        //only one of these values is ever used; the other(s) are discarded
        $boolValue = CommonTypes::getBool($in);
        $floatValue = LE::readFloat($in);
 
        $this->abilityValue = match($valueType){
            self::VALUE_TYPE_BOOL => $boolValue,
            self::VALUE_TYPE_FLOAT => $floatValue,
            default => throw new PacketDecodeException("Unknown ability value type $valueType")
        };
    }
 
    protected function encodePayload(ByteBufferWriter $out) : void{
        VarInt::writeSignedInt($out, $this->abilityId);
 
        [$valueType, $boolValue, $floatValue] = match(true){
            is_bool($this->abilityValue) => [self::VALUE_TYPE_BOOL, $this->abilityValue, 0.0],
            is_float($this->abilityValue) => [self::VALUE_TYPE_FLOAT, false, $this->abilityValue],
            default => throw new \LogicException("Unreachable")
        };
        Byte::writeUnsigned($out, $valueType);
        CommonTypes::putBool($out, $boolValue);
        LE::writeFloat($out, $floatValue);
    }
 
    public function handle(PacketHandlerInterface $handler) : bool{
        return $handler->handleRequestAbility($this);
    }
}