Alex Hochheiden
d0470670a1
`third_party/node/node_modules` is generated by `./mach vendor node`. Differential Revision: https://phabricator.services.mozilla.com/D320322
53 lines
1.8 KiB
JavaScript
53 lines
1.8 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Ivan Kopeykin @vankop
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*/
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"use strict";
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/** @typedef {import("./Hash")} Hash */
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const A_CODE = "a".charCodeAt(0);
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/**
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* Returns hash that has at least one non numeric char.
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* @param {string} hash hash
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* @param {number} hashLength hash length
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* @returns {string} returns hash that has at least one non numeric char
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*/
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const nonNumericOnlyHash = (hash, hashLength) => {
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if (hashLength < 1) return "";
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const slice = hash.slice(0, hashLength);
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if (/[^\d]/.test(slice)) return slice;
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return `${String.fromCharCode(
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A_CODE + (Number.parseInt(hash[0], 10) % 6)
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)}${slice.slice(1)}`;
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};
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/**
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* Digests a hash and truncates it to a content-hash string (non-numeric first char).
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* @param {Hash} hash hash
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* @param {string} hashDigest digest encoding
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* @param {number} hashDigestLength hash length
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* @returns {string} content hash string
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*/
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const digestNonNumericOnly = (hash, hashDigest, hashDigestLength) =>
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nonNumericOnlyHash(hash.digest(hashDigest), hashDigestLength);
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/**
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* Digests a hash, returning both the truncated content-hash string and the full
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* (untruncated) digest, so `[contenthash:<digest>]` can re-encode from full entropy.
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* @param {Hash} hash hash
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* @param {string} hashDigest digest encoding
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* @param {number} hashDigestLength hash length
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* @returns {[string, string]} content hash string and full digest
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*/
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const digestNonNumericOnlyWithFull = (hash, hashDigest, hashDigestLength) => {
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const full = /** @type {string} */ (hash.digest(hashDigest));
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return [nonNumericOnlyHash(full, hashDigestLength), full];
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};
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module.exports = nonNumericOnlyHash;
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module.exports.digestNonNumericOnly = digestNonNumericOnly;
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module.exports.digestNonNumericOnlyWithFull = digestNonNumericOnlyWithFull;
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