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- 'use strict';
- var $ = require('../internals/export');
- var globalThis = require('../internals/global-this');
- var getBuiltIn = require('../internals/get-built-in');
- var uncurryThis = require('../internals/function-uncurry-this');
- var call = require('../internals/function-call');
- var fails = require('../internals/fails');
- var toString = require('../internals/to-string');
- var validateArgumentsLength = require('../internals/validate-arguments-length');
- var c2i = require('../internals/base64-map').c2i;
-
- var disallowed = /[^\d+/a-z]/i;
- var whitespaces = /[\t\n\f\r ]+/g;
- var finalEq = /[=]{1,2}$/;
-
- var $atob = getBuiltIn('atob');
- var fromCharCode = String.fromCharCode;
- var charAt = uncurryThis(''.charAt);
- var replace = uncurryThis(''.replace);
- var exec = uncurryThis(disallowed.exec);
-
- var BASIC = !!$atob && !fails(function () {
- return $atob('aGk=') !== 'hi';
- });
-
- var NO_SPACES_IGNORE = BASIC && fails(function () {
- return $atob(' ') !== '';
- });
-
- var NO_ENCODING_CHECK = BASIC && !fails(function () {
- $atob('a');
- });
-
- var NO_ARG_RECEIVING_CHECK = BASIC && !fails(function () {
- $atob();
- });
-
- var WRONG_ARITY = BASIC && $atob.length !== 1;
-
- var FORCED = !BASIC || NO_SPACES_IGNORE || NO_ENCODING_CHECK || NO_ARG_RECEIVING_CHECK || WRONG_ARITY;
-
- // `atob` method
- // https://html.spec.whatwg.org/multipage/webappapis.html#dom-atob
- $({ global: true, bind: true, enumerable: true, forced: FORCED }, {
- atob: function atob(data) {
- validateArgumentsLength(arguments.length, 1);
- // `webpack` dev server bug on IE global methods - use call(fn, global, ...)
- if (BASIC && !NO_SPACES_IGNORE && !NO_ENCODING_CHECK) return call($atob, globalThis, data);
- var string = replace(toString(data), whitespaces, '');
- var output = '';
- var position = 0;
- var bc = 0;
- var length, chr, bs;
- if (string.length % 4 === 0) {
- string = replace(string, finalEq, '');
- }
- length = string.length;
- if (length % 4 === 1 || exec(disallowed, string)) {
- throw new (getBuiltIn('DOMException'))('The string is not correctly encoded', 'InvalidCharacterError');
- }
- while (position < length) {
- chr = charAt(string, position++);
- bs = bc % 4 ? bs * 64 + c2i[chr] : c2i[chr];
- if (bc++ % 4) output += fromCharCode(255 & bs >> (-2 * bc & 6));
- } return output;
- }
- });
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