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53 lines
1.8 KiB
53 lines
1.8 KiB
3 years ago
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var $ = require('../internals/export');
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var getBuiltIn = require('../internals/get-built-in');
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var uncurryThis = require('../internals/function-uncurry-this');
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var fails = require('../internals/fails');
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var toString = require('../internals/to-string');
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var hasOwn = require('../internals/has-own-property');
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var validateArgumentsLength = require('../internals/validate-arguments-length');
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var ctoi = require('../internals/base64-map').ctoi;
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var disallowed = /[^\d+/a-z]/i;
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var whitespaces = /[\t\n\f\r ]+/g;
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var finalEq = /[=]+$/;
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var $atob = getBuiltIn('atob');
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var fromCharCode = String.fromCharCode;
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var charAt = uncurryThis(''.charAt);
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var replace = uncurryThis(''.replace);
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var exec = uncurryThis(disallowed.exec);
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var NO_SPACES_IGNORE = fails(function () {
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return atob(' ') !== '';
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});
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var NO_ARG_RECEIVING_CHECK = !NO_SPACES_IGNORE && !fails(function () {
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$atob();
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});
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// `atob` method
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// https://html.spec.whatwg.org/multipage/webappapis.html#dom-atob
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$({ global: true, enumerable: true, forced: NO_SPACES_IGNORE || NO_ARG_RECEIVING_CHECK }, {
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atob: function atob(data) {
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validateArgumentsLength(arguments.length, 1);
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if (NO_ARG_RECEIVING_CHECK) return $atob(data);
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var string = replace(toString(data), whitespaces, '');
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var output = '';
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var position = 0;
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var bc = 0;
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var chr, bs;
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if (string.length % 4 == 0) {
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string = replace(string, finalEq, '');
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}
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if (string.length % 4 == 1 || exec(disallowed, string)) {
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throw new (getBuiltIn('DOMException'))('The string is not correctly encoded', 'InvalidCharacterError');
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}
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while (chr = charAt(string, position++)) {
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if (hasOwn(ctoi, chr)) {
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bs = bc % 4 ? bs * 64 + ctoi[chr] : ctoi[chr];
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if (bc++ % 4) output += fromCharCode(255 & bs >> (-2 * bc & 6));
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}
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} return output;
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}
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});
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