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 uncurryThis = require('../internals/function-uncurry-this');
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5 | var anObjectOrUndefined = require('../internals/an-object-or-undefined');
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6 | var anUint8Array = require('../internals/an-uint8-array');
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7 | var base64Map = require('../internals/base64-map');
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8 | var getAlphabetOption = require('../internals/get-alphabet-option');
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9 |
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10 | var base64Alphabet = base64Map.i2c;
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11 | var base64UrlAlphabet = base64Map.i2cUrl;
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12 |
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13 | var Uint8Array = global.Uint8Array;
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14 | var charAt = uncurryThis(''.charAt);
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15 |
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16 |
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17 |
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18 | if (Uint8Array) $({ target: 'Uint8Array', proto: true, forced: true }, {
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19 | toBase64: function toBase64(/* options */) {
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20 | var array = anUint8Array(this);
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21 | var options = arguments.length ? anObjectOrUndefined(arguments[0]) : undefined;
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22 | var alphabet = getAlphabetOption(options) === 'base64' ? base64Alphabet : base64UrlAlphabet;
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23 |
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24 | var result = '';
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25 | var i = 0;
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26 | var length = array.length;
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27 | var triplet;
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28 |
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29 | var at = function (shift) {
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30 | return charAt(alphabet, (triplet >> (6 * shift)) & 63);
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31 | };
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32 |
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33 | for (; i + 2 < length; i += 3) {
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34 | triplet = (array[i] << 16) + (array[i + 1] << 8) + array[i + 2];
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35 | result += at(3) + at(2) + at(1) + at(0);
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36 | }
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37 | if (i + 2 === length) {
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38 | triplet = (array[i] << 16) + (array[i + 1] << 8);
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39 | result += at(3) + at(2) + at(1) + '=';
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40 | } else if (i + 1 === length) {
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41 | triplet = array[i] << 16;
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42 | result += at(3) + at(2) + '==';
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43 | }
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44 |
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45 | return result;
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46 | }
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47 | });
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