20 lines
555 B
JavaScript
20 lines
555 B
JavaScript
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'use strict';
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var commonAlphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
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var base64Alphabet = commonAlphabet + '+/';
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var base64UrlAlphabet = commonAlphabet + '-_';
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var inverse = function (characters) {
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// TODO: use `Object.create(null)` in `core-js@4`
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var result = {};
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var index = 0;
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for (; index < 64; index++) result[characters.charAt(index)] = index;
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return result;
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};
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module.exports = {
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i2c: base64Alphabet,
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c2i: inverse(base64Alphabet),
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i2cUrl: base64UrlAlphabet,
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c2iUrl: inverse(base64UrlAlphabet)
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};
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