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38 lines
1.4 KiB
38 lines
1.4 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 validateArgumentsLength = require('../internals/validate-arguments-length');
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var itoc = require('../internals/base64-map').itoc;
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var $btoa = getBuiltIn('btoa');
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var charAt = uncurryThis(''.charAt);
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var charCodeAt = uncurryThis(''.charCodeAt);
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var NO_ARG_RECEIVING_CHECK = !!$btoa && !fails(function () {
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$btoa();
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});
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// `btoa` method
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// https://html.spec.whatwg.org/multipage/webappapis.html#dom-btoa
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$({ global: true, enumerable: true, forced: NO_ARG_RECEIVING_CHECK }, {
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btoa: function btoa(data) {
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validateArgumentsLength(arguments.length, 1);
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if (NO_ARG_RECEIVING_CHECK) return $btoa(data);
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var string = toString(data);
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var output = '';
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var position = 0;
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var map = itoc;
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var block, charCode;
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while (charAt(string, position) || (map = '=', position % 1)) {
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charCode = charCodeAt(string, position += 3 / 4);
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if (charCode > 0xFF) {
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throw new (getBuiltIn('DOMException'))('The string contains characters outside of the Latin1 range', 'InvalidCharacterError');
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}
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block = block << 8 | charCode;
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output += charAt(map, 63 & block >> 8 - position % 1 * 8);
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} return output;
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}
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});
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