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37 lines
1.4 KiB
37 lines
1.4 KiB
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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