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crc fake random generator

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This commit is contained in:
Shoghi Cervantes 2014-04-08 16:35:45 +02:00
parent 1d40399b9c
commit da5853083c
1 changed files with 4 additions and 25 deletions
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29
src/pocketmine/utils/Random.php
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@ -29,9 +29,7 @@ namespace pocketmine\utils;
*/
class Random{
protected $x;
protected $y;
protected $z;
protected $seed;
/**
* @param int $seed Integer to be used as seed.
@ -47,10 +45,7 @@ class Random{
* @param int $seed Integer to be used as seed.
*/
public function setSeed($seed){
$seed = crc32($seed);
$this->x = ($seed ^ 1076543210) & INT32_MASK;
$this->z = ($seed ^ 0xdeadc0de) & INT32_MASK;
$this->y = ($seed ^ 1122334455) & INT32_MASK;
$this->seed = crc32(Binary::writeInt($seed));
}
/**
@ -68,24 +63,8 @@ class Random{
* @return int
*/
public function nextSignedInt(){
if(INT32_MASK === -1){ //32 bit, do hacky things to shift sign
$this->x ^= $this->x << 16;
$hasBit = $this->x < 1;
$t = ($hasBit === true ? $this->x ^ ~0x7fffffff : $this->x) >> 5;
$this->x ^= ($hasBit === true ? $t ^ ~0x7fffffff : $t);
$this->x ^= $this->x << 1;
}else{ //64 bit
$this->x ^= ($this->x << 16) & INT32_MASK;
$this->x ^= $this->x >> 5;
$this->x ^= ($this->x << 1) & INT32_MASK;
}
$t = $this->x;
$this->x = $this->y;
$this->y = $this->z;
$this->z = $t ^ $this->x ^ $this->y;
$t = $this->z;
$t = crc32(Binary::writeInt($this->seed));
$this->seed ^= $t;
if($t > 2147483647){
$t -= 4294967296;