mirror of
https://github.com/pmmp/PocketMine-MP.git
synced 2025-08-19 01:20:26 +00:00
75 lines
2.1 KiB
PHP
75 lines
2.1 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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//Unsecure, not used for "Real Randomness"
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class Random{
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private $x, $y, $z, $w;
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public function __construct($seed = false){
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$this->setSeed($seed);
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}
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public function setSeed($seed = false){
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$seed = $seed !== false ? Utils::writeInt((int) $seed):Utils::getRandomBytes(4, false);
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$state = array();
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for($i = 0; $i < 256; ++$i){
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$state[] = $i;
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}
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for($i = $j = 0; $i < 256; ++$i){
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$j = ($j + ord($seed{$i & 0x03}) + $state[$i]) & 0xFF;
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$state[$i] ^= $state[$j];
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$state[$j] ^= $state[$i];
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$state[$i] ^= $state[$j];
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}
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$this->state = $state;
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$this->i = $this->j = 0;
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}
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public function nextInt(){
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return Utils::readInt($this->nextBytes(4)) & 0x7FFFFFFF;
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}
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public function nextFloat(){
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return $this->nextInt() / 0x7FFFFFFF;
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}
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public function nextBytes($byteCount){
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$bytes = "";
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for($i = 0; $i < $byteCount; ++$i){
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$this->i = ($this->i + 1) & 0xFF;
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$this->j = ($this->j + $this->state[$this->i]) & 0xFF;
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$this->state[$this->i] ^= $this->state[$this->j];
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$this->state[$this->j] ^= $this->state[$this->i];
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$this->state[$this->i] ^= $this->state[$this->j];
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$bytes .= chr($this->state[($this->state[$this->i] + $this->state[$this->j]) & 0xFF]);
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}
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return $bytes;
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}
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public function nextBoolean(){
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return ($this->nextBytes(1) & 0x01) == 0;
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}
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public function nextRange($start = 0, $end = PHP_INT_MAX){
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return $start + ($this->nextInt() % ($end + 1 - $start));
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}
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} |