59 lines
1.6 KiB
JavaScript
59 lines
1.6 KiB
JavaScript
|
"use strict";
|
||
|
|
|
||
|
|
Object.defineProperty(exports, "__esModule", {
|
||
|
|
value: true
|
||
|
|
});
|
||
|
|
exports.default = void 0;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* JS Implementation of MurmurHash2
|
||
|
|
*
|
||
|
|
* @author <a href="mailto:gary.court@gmail.com">Gary Court</a>
|
||
|
|
* @see http://github.com/garycourt/murmurhash-js
|
||
|
|
* @author <a href="mailto:aappleby@gmail.com">Austin Appleby</a>
|
||
|
|
* @see http://sites.google.com/site/murmurhash/
|
||
|
|
*
|
||
|
|
* @param {string} str ASCII only
|
||
|
|
* @return {string} Base 36 encoded hash result
|
||
|
|
*/
|
||
|
|
function murmurhash2_32_gc(str) {
|
||
|
|
let l = str.length;
|
||
|
|
let h = l;
|
||
|
|
let i = 0;
|
||
|
|
let k;
|
||
|
|
|
||
|
|
while (l >= 4) {
|
||
|
|
k = str.charCodeAt(i) & 0xff | (str.charCodeAt(++i) & 0xff) << 8 | (str.charCodeAt(++i) & 0xff) << 16 | (str.charCodeAt(++i) & 0xff) << 24;
|
||
|
|
k = (k & 0xffff) * 0x5bd1e995 + (((k >>> 16) * 0x5bd1e995 & 0xffff) << 16);
|
||
|
|
k ^= k >>> 24;
|
||
|
|
k = (k & 0xffff) * 0x5bd1e995 + (((k >>> 16) * 0x5bd1e995 & 0xffff) << 16);
|
||
|
|
h = (h & 0xffff) * 0x5bd1e995 + (((h >>> 16) * 0x5bd1e995 & 0xffff) << 16) ^ k;
|
||
|
|
l -= 4;
|
||
|
|
++i;
|
||
|
|
} // forgive existing code
|
||
|
|
|
||
|
|
/* eslint-disable no-fallthrough */
|
||
|
|
|
||
|
|
|
||
|
|
switch (l) {
|
||
|
|
case 3:
|
||
|
|
h ^= (str.charCodeAt(i + 2) & 0xff) << 16;
|
||
|
|
|
||
|
|
case 2:
|
||
|
|
h ^= (str.charCodeAt(i + 1) & 0xff) << 8;
|
||
|
|
|
||
|
|
case 1:
|
||
|
|
h ^= str.charCodeAt(i) & 0xff;
|
||
|
|
h = (h & 0xffff) * 0x5bd1e995 + (((h >>> 16) * 0x5bd1e995 & 0xffff) << 16);
|
||
|
|
}
|
||
|
|
/* eslint-enable no-fallthrough */
|
||
|
|
|
||
|
|
|
||
|
|
h ^= h >>> 13;
|
||
|
|
h = (h & 0xffff) * 0x5bd1e995 + (((h >>> 16) * 0x5bd1e995 & 0xffff) << 16);
|
||
|
|
h ^= h >>> 15;
|
||
|
|
return (h >>> 0).toString(36);
|
||
|
|
}
|
||
|
|
|
||
|
|
var _default = murmurhash2_32_gc;
|
||
|
|
exports.default = _default;
|