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add cyrb128 hash function

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Laetitia (O-01-67) 2023-02-21 16:52:10 -05:00 committed by GitHub
parent 4b418541ef
commit 3bc7961010
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1 changed files with 18 additions and 0 deletions
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18
mods/code_library.js
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@ -40,6 +40,24 @@
return Math.floor(Math.random() * (max - min + 1)) + min
};
//cyrb128 idk where this comes from but it was in the same thread
function cyrb128(str) {
let h1 = 1779033703, h2 = 3144134277,
h3 = 1013904242, h4 = 2773480762;
for (let i = 0, k; i < str.length; i++) {
k = str.charCodeAt(i);
h1 = h2 ^ Math.imul(h1 ^ k, 597399067);
h2 = h3 ^ Math.imul(h2 ^ k, 2869860233);
h3 = h4 ^ Math.imul(h3 ^ k, 951274213);
h4 = h1 ^ Math.imul(h4 ^ k, 2716044179);
}
h1 = Math.imul(h3 ^ (h1 >>> 18), 597399067);
h2 = Math.imul(h4 ^ (h2 >>> 22), 2869860233);
h3 = Math.imul(h1 ^ (h3 >>> 17), 951274213);
h4 = Math.imul(h2 ^ (h4 >>> 19), 2716044179);
return [(h1^h2^h3^h4)>>>0, (h2^h1)>>>0, (h3^h1)>>>0, (h4^h1)>>>0];
}
function mulberry32(a) { //Mulberry32 implemented in JS from StackOverflow, https://gist.github.com/tommyettinger/46a874533244883189143505d203312c
return function() {
var t = a += 0x6D2B79F5;