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working optimised version of hash3_int #17

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76 changes: 45 additions & 31 deletions src/lastguest/Murmur.php
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Original file line number Diff line number Diff line change
Expand Up @@ -14,48 +14,61 @@

namespace lastguest;

class Murmur {
class Murmur
{

/**
* @param string $key Text to hash.
* @param integer $seed Positive integer only
* @return integer 32-bit positive integer hash
*/
public static function hash3_int(string $key, int $seed=0) : int {
$key = array_values(unpack('C*', $key));
public static function hash3_int(string $key, int $seed = 0): int
{
$key = array_values(unpack('C*', $key));
$klen = count($key);
$h1 = $seed < 0 ? -$seed : $seed;
$remainder = $i = 0;
for ($bytes=$klen-($remainder=$klen&3) ; $i < $bytes ; ) {
$k1 = $key[$i]
| ($key[++$i] << 8)
| ($key[++$i] << 16)
| ($key[++$i] << 24);
$h1 = $seed < 0 ? -$seed : $seed;
$bytes = $klen - ($remainder = $klen & 3);

for ($i = 0; $i < $bytes; ) {
$k1 = $key[$i] |
($key[++$i] << 8) |
($key[++$i] << 16) |
($key[++$i] << 24);
++$i;
$k1 = (((($k1 & 0xffff) * 0xcc9e2d51) + ((((($k1 >= 0 ? $k1 >> 16 : (($k1 & 0x7fffffff) >> 16) | 0x8000)) * 0xcc9e2d51) & 0xffff) << 16))) & 0xffffffff;
$k1 = $k1 << 15 | ($k1 >= 0 ? $k1 >> 17 : (($k1 & 0x7fffffff) >> 17) | 0x4000);
$k1 = (((($k1 & 0xffff) * 0x1b873593) + ((((($k1 >= 0 ? $k1 >> 16 : (($k1 & 0x7fffffff) >> 16) | 0x8000)) * 0x1b873593) & 0xffff) << 16))) & 0xffffffff;

$k1 = (($k1 & 0xFFFF) * 0x2D51 + ((($k1 >> 16) * 0x2D51 + ($k1 & 0xFFFF) * 0xCC9E) << 16)) & 0xFFFFFFFF;
$k1 = (($k1 << 15) | (($k1 >> 17) & 0x7FFF)) & 0xFFFFFFFF;
$k1 = (($k1 & 0xFFFF) * 0x3593 + ((($k1 >> 16) * 0x3593 + ($k1 & 0xFFFF) * 0x1B87) << 16)) & 0xFFFFFFFF;

$h1 ^= $k1;
$h1 = $h1 << 13 | ($h1 >= 0 ? $h1 >> 19 : (($h1 & 0x7fffffff) >> 19) | 0x1000);
$h1b = (((($h1 & 0xffff) * 5) + ((((($h1 >= 0 ? $h1 >> 16 : (($h1 & 0x7fffffff) >> 16) | 0x8000)) * 5) & 0xffff) << 16))) & 0xffffffff;
$h1 = ((($h1b & 0xffff) + 0x6b64) + ((((($h1b >= 0 ? $h1b >> 16 : (($h1b & 0x7fffffff) >> 16) | 0x8000)) + 0xe654) & 0xffff) << 16));
$h1 = (($h1 << 13) | (($h1 >> 19) & 0x1FFF)) & 0xFFFFFFFF;
$h1 = (($h1 & 0xFFFF) * 5 + ((($h1 >> 16) * 5) << 16)) & 0xFFFFFFFF;
$h1 = ($h1 + 0xe6546b64) & 0xFFFFFFFF;
}
$k1 = 0;
switch ($remainder) {
case 3: $k1 ^= $key[$i + 2] << 16;
case 2: $k1 ^= $key[$i + 1] << 8;
case 1: $k1 ^= $key[$i];
$k1 = ((($k1 & 0xffff) * 0xcc9e2d51) + ((((($k1 >= 0 ? $k1 >> 16 : (($k1 & 0x7fffffff) >> 16) | 0x8000)) * 0xcc9e2d51) & 0xffff) << 16)) & 0xffffffff;
$k1 = $k1 << 15 | ($k1 >= 0 ? $k1 >> 17 : (($k1 & 0x7fffffff) >> 17) | 0x4000);
$k1 = ((($k1 & 0xffff) * 0x1b873593) + ((((($k1 >= 0 ? $k1 >> 16 : (($k1 & 0x7fffffff) >> 16) | 0x8000)) * 0x1b873593) & 0xffff) << 16)) & 0xffffffff;
$h1 ^= $k1;

if ($remainder) {
$k1 = 0;
switch ($remainder) {
case 3:
$k1 ^= $key[$i + 2] << 16;
case 2:
$k1 ^= $key[$i + 1] << 8;
case 1:
$k1 ^= $key[$i];
$k1 = (($k1 & 0xFFFF) * 0x2D51 + ((($k1 >> 16) * 0x2D51 + ($k1 & 0xFFFF) * 0xCC9E) << 16)) & 0xFFFFFFFF;
$k1 = (($k1 << 15) | (($k1 >> 17) & 0x7FFF)) & 0xFFFFFFFF;
$k1 = (($k1 & 0xFFFF) * 0x3593 + ((($k1 >> 16) * 0x3593 + ($k1 & 0xFFFF) * 0x1B87) << 16)) & 0xFFFFFFFF;
$h1 ^= $k1;
}
}

$h1 ^= $klen;
$h1 ^= ($h1 >= 0 ? $h1 >> 16 : (($h1 & 0x7fffffff) >> 16) | 0x8000);
$h1 = ((($h1 & 0xffff) * 0x85ebca6b) + ((((($h1 >= 0 ? $h1 >> 16 : (($h1 & 0x7fffffff) >> 16) | 0x8000)) * 0x85ebca6b) & 0xffff) << 16)) & 0xffffffff;
$h1 ^= ($h1 >= 0 ? $h1 >> 13 : (($h1 & 0x7fffffff) >> 13) | 0x40000);
$h1 = (((($h1 & 0xffff) * 0xc2b2ae35) + ((((($h1 >= 0 ? $h1 >> 16 : (($h1 & 0x7fffffff) >> 16) | 0x8000)) * 0xc2b2ae35) & 0xffff) << 16))) & 0xffffffff;
$h1 ^= ($h1 >= 0 ? $h1 >> 16 : (($h1 & 0x7fffffff) >> 16) | 0x8000);
$h1 ^= ($h1 >> 16) & 0xFFFF;
$h1 = (($h1 & 0xFFFF) * 0xCA6B + ((($h1 >> 16) * 0xCA6B + ($h1 & 0xFFFF) * 0x85EB) << 16)) & 0xFFFFFFFF;
$h1 ^= ($h1 >> 13) & 0x7FFFF;
$h1 = (($h1 & 0xFFFF) * 0xAE35 + ((($h1 >> 16) * 0xAE35 + ($h1 & 0xFFFF) * 0xC2B2) << 16)) & 0xFFFFFFFF;
$h1 ^= ($h1 >> 16) & 0xFFFF;

return $h1;
}

Expand All @@ -64,7 +77,8 @@ public static function hash3_int(string $key, int $seed=0) : int {
* @param integer $seed Positive integer only
* @return string
*/
public static function hash3(string $key, int $seed=0) : string {
public static function hash3(string $key, int $seed = 0): string
{
return base_convert(sprintf("%u\n", self::hash3_int($key, $seed)), 10, 32);
}
}