mirror of
https://github.com/pmmp/PocketMine-MP.git
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296825b87e
serialize/unserialize don't preserve const refs, so this is necessary to reassign global refs post-unserialize
101 lines
2.8 KiB
PHP
101 lines
2.8 KiB
PHP
<?php
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/*
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*
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* ____ _ _ __ __ _ __ __ ____
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* | _ \ ___ ___| | _____| |_| \/ (_)_ __ ___ | \/ | _ \
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* | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
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* | __/ (_) | (__| < __/ |_| | | | | | | | __/_____| | | | __/
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* |_| \___/ \___|_|\_\___|\__|_| |_|_|_| |_|\___| |_| |_|_|
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*
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* This program 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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* @author PocketMine Team
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* @link http://www.pocketmine.net/
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*
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*
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*/
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declare(strict_types=1);
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namespace pocketmine\world\format;
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use function chr;
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use function define;
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use function defined;
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use function ord;
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use function str_repeat;
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use function strlen;
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if(!defined(__NAMESPACE__ . '\ZERO_NIBBLE_ARRAY')){
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define(__NAMESPACE__ . '\ZERO_NIBBLE_ARRAY', str_repeat("\x00", 2048));
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}
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if(!defined(__NAMESPACE__ . '\FIFTEEN_NIBBLE_ARRAY')){
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define(__NAMESPACE__ . '\FIFTEEN_NIBBLE_ARRAY', str_repeat("\xff", 2048));
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}
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final class LightArray{
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public const ZERO = ZERO_NIBBLE_ARRAY;
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public const FIFTEEN = FIFTEEN_NIBBLE_ARRAY;
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/** @var string */
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private $data;
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public function __construct(?string $payload){
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if($payload !== null and ($len = strlen($payload)) !== 2048){
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throw new \InvalidArgumentException("Payload size must be 2048 bytes, but got $len bytes");
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}
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$this->data = $payload ?? self::ZERO;
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$this->collectGarbage();
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}
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public static function fill(int $level) : self{
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if($level === 0){
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return new self(self::ZERO);
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}
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if($level === 15){
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return new self(self::FIFTEEN);
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}
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return new self(str_repeat(chr(($level & 0x0f) | ($level << 4)), 2048));
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}
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public function get(int $x, int $y, int $z) : int{
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return (ord($this->data[($x << 7) | ($z << 3) | ($y >> 1)]) >> (($y & 1) << 2)) & 0xf;
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}
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public function set(int $x, int $y, int $z, int $level) : void{
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$i = ($x << 7) | ($z << 3) | ($y >> 1);
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$shift = ($y & 1) << 2;
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$byte = ord($this->data[$i]);
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$this->data[$i] = chr(($byte & ~(0xf << $shift)) | (($level & 0xf) << $shift));
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}
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public function collectGarbage() : void{
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/*
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* This strange looking code is designed to exploit PHP's copy-on-write behaviour. Assigning will copy a
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* reference to the const instead of duplicating the whole string. The string will only be duplicated when
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* modified, which is perfect for this purpose.
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*/
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if($this->data === ZERO_NIBBLE_ARRAY){
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$this->data = ZERO_NIBBLE_ARRAY;
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}elseif($this->data === FIFTEEN_NIBBLE_ARRAY){
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$this->data = FIFTEEN_NIBBLE_ARRAY;
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}
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}
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public function getData() : string{
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return $this->data;
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}
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public function __wakeup(){
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//const refs aren't preserved when unserializing
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$this->collectGarbage();
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}
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}
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