1 | 'use strict';
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2 | var $ = require('../internals/export');
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3 | var global = require('../internals/global');
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4 | var getBuiltIn = require('../internals/get-built-in');
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5 | var uncurryThis = require('../internals/function-uncurry-this');
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6 | var call = require('../internals/function-call');
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7 | var fails = require('../internals/fails');
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8 | var toString = require('../internals/to-string');
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9 | var validateArgumentsLength = require('../internals/validate-arguments-length');
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10 | var c2i = require('../internals/base64-map').c2i;
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11 |
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12 | var disallowed = /[^\d+/a-z]/i;
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13 | var whitespaces = /[\t\n\f\r ]+/g;
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14 | var finalEq = /[=]{1,2}$/;
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15 |
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16 | var $atob = getBuiltIn('atob');
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17 | var fromCharCode = String.fromCharCode;
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18 | var charAt = uncurryThis(''.charAt);
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19 | var replace = uncurryThis(''.replace);
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20 | var exec = uncurryThis(disallowed.exec);
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21 |
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22 | var BASIC = !!$atob && !fails(function () {
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23 | return $atob('aGk=') !== 'hi';
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24 | });
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25 |
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26 | var NO_SPACES_IGNORE = BASIC && fails(function () {
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27 | return $atob(' ') !== '';
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28 | });
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29 |
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30 | var NO_ENCODING_CHECK = BASIC && !fails(function () {
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31 | $atob('a');
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32 | });
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33 |
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34 | var NO_ARG_RECEIVING_CHECK = BASIC && !fails(function () {
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35 | $atob();
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36 | });
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37 |
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38 | var WRONG_ARITY = BASIC && $atob.length !== 1;
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39 |
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40 | var FORCED = !BASIC || NO_SPACES_IGNORE || NO_ENCODING_CHECK || NO_ARG_RECEIVING_CHECK || WRONG_ARITY;
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41 |
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42 |
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43 |
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44 | $({ global: true, bind: true, enumerable: true, forced: FORCED }, {
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45 | atob: function atob(data) {
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46 | validateArgumentsLength(arguments.length, 1);
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47 |
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48 | if (BASIC && !NO_SPACES_IGNORE && !NO_ENCODING_CHECK) return call($atob, global, data);
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49 | var string = replace(toString(data), whitespaces, '');
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50 | var output = '';
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51 | var position = 0;
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52 | var bc = 0;
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53 | var length, chr, bs;
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54 | if (string.length % 4 === 0) {
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55 | string = replace(string, finalEq, '');
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56 | }
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57 | length = string.length;
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58 | if (length % 4 === 1 || exec(disallowed, string)) {
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59 | throw new (getBuiltIn('DOMException'))('The string is not correctly encoded', 'InvalidCharacterError');
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60 | }
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61 | while (position < length) {
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62 | chr = charAt(string, position++);
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63 | bs = bc % 4 ? bs * 64 + c2i[chr] : c2i[chr];
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64 | if (bc++ % 4) output += fromCharCode(255 & bs >> (-2 * bc & 6));
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65 | } return output;
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66 | }
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67 | });
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