53 lines
2.6 KiB
JavaScript
53 lines
2.6 KiB
JavaScript
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// source: https://github.com/sindresorhus/fnv1a
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// FNV_PRIMES and FNV_OFFSETS from
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// http://www.isthe.com/chongo/tech/comp/fnv/index.html#FNV-param
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/* eslint-disable @typescript-eslint/no-loss-of-precision */ "use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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Object.defineProperty(exports, "default", {
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enumerable: true,
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get: function() {
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return fnv1a;
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}
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});
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const FNV_PRIMES = {
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32: BigInt(16777619),
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64: BigInt(1099511628211),
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128: BigInt(309485009821345068724781371),
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256: BigInt(374144419156711147060143317175368453031918731002211),
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512: BigInt(35835915874844867368919076489095108449946327955754392558399825615420669938882575126094039892345713852759),
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1024: BigInt(5016456510113118655434598811035278955030765345404790744303017523831112055108147451509157692220295382716162651878526895249385292291816524375083746691371804094271873160484737966720260389217684476157468082573)
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};
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const FNV_OFFSETS = {
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32: BigInt(2166136261),
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64: BigInt(14695981039346656037),
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128: BigInt(144066263297769815596495629667062367629),
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256: BigInt(100029257958052580907070968620625704837092796014241193945225284501741471925557),
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512: BigInt(9659303129496669498009435400716310466090418745672637896108374329434462657994582932197716438449813051892206539805784495328239340083876191928701583869517785),
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1024: BigInt(14197795064947621068722070641403218320880622795441933960878474914617582723252296732303717722150864096521202355549365628174669108571814760471015076148029755969804077320157692458563003215304957150157403644460363550505412711285966361610267868082893823963790439336411086884584107735010676915)
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};
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function fnv1a(inputString, param) {
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let { size = 32, seed = 0 } = param === void 0 ? {} : param;
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if (!FNV_PRIMES[size]) {
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throw new Error("The `size` option must be one of 32, 64, 128, 256, 512, or 1024");
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}
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let hash = FNV_OFFSETS[size] ^ BigInt(seed);
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const fnvPrime = FNV_PRIMES[size];
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// Handle Unicode code points > 0x7f
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let isUnicoded = false;
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for(let index = 0; index < inputString.length; index++){
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let characterCode = inputString.charCodeAt(index);
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// Non-ASCII characters trigger the Unicode escape logic
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if (characterCode > 0x7f && !isUnicoded) {
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inputString = unescape(encodeURIComponent(inputString));
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characterCode = inputString.charCodeAt(index);
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isUnicoded = true;
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}
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hash ^= BigInt(characterCode);
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hash = BigInt.asUintN(size, hash * fnvPrime);
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}
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return hash;
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}
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//# sourceMappingURL=fnv1a.js.map
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