mirror of
https://github.com/pmmp/PocketMine-MP.git
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127 lines
2.7 KiB
PHP
127 lines
2.7 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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namespace pocketmine\utils;
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/**
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* Unsecure Random Number Generator, used for fast seeded values
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* WARNING: This class is available on the PocketMine-MP Zephir project.
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* If this class is modified, remember to modify the PHP C extension.
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*/
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class Random{
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protected $x;
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protected $y;
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protected $z;
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/**
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* @param int $seed Integer to be used as seed.
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*/
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public function __construct($seed = -1){
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if($seed == -1){
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$seed = time();
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}
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$this->setSeed($seed);
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}
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/**
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* @param int $seed Integer to be used as seed.
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*/
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public function setSeed($seed){
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$seed = crc32($seed);
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$this->x = ($seed ^ 9876543210) % 0x7fffffff;
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$this->z = ($seed ^ -123456789) % 0x7fffffff;
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$this->y = ($seed ^ 1122334455) % 0x7fffffff;
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}
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/**
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* Returns an 31-bit integer (not signed)
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*
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* @return int
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*/
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public function nextInt(){
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return $this->nextSignedInt() & 0x7fffffff;
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}
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/**
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* Returns a 32-bit integer (signed)
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*
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* @return int
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*/
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public function nextSignedInt(){
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$this->x ^= ($this->x << 16) & 0xffffffff;
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$this->x ^= ($this->x >> 5) & 0xffffffff;
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$this->x ^= ($this->x << 1) & 0xffffffff;
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$t = $this->x;
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$this->x = $this->y;
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$this->y = $this->z;
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$this->z = $t ^ $this->x ^ $this->y;
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$t = $this->z;
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if($t > 2147483647){
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$t -= 4294967296;
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}
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return (int) $t % 0x7fffffff;
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}
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/**
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* Returns a float between 0.0 and 1.0 (inclusive)
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*
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* @return float
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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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/**
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* Returns a float between -1.0 and 1.0 (inclusive)
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*
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* @return float
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*/
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public function nextSignedFloat(){
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return $this->nextSignedInt() / 0x7fffffff;
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}
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/**
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* Returns a random boolean
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*
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* @return bool
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*/
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public function nextBoolean(){
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return ($this->nextSignedInt() & 0x01) === 0;
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}
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/**
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* Returns a random integer between $start and $end
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*
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* @param int $start default 0
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* @param int $end default PHP_INT_MAX
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*
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* @return int
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*/
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public function nextRange($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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} |