1 | /*
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2 | * base64-arraybuffer 1.0.1 <https://github.com/niklasvh/base64-arraybuffer>
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3 | * Copyright (c) 2021 Niklas von Hertzen <https://hertzen.com>
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4 | * Released under MIT License
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5 | */
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6 | (function (global, factory) {
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7 | typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
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8 | typeof define === 'function' && define.amd ? define(['exports'], factory) :
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9 | (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global['base64-arraybuffer'] = {}));
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10 | }(this, (function (exports) { 'use strict';
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11 |
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12 | var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
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13 | // Use a lookup table to find the index.
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14 | var lookup = typeof Uint8Array === 'undefined' ? [] : new Uint8Array(256);
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15 | for (var i = 0; i < chars.length; i++) {
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16 | lookup[chars.charCodeAt(i)] = i;
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17 | }
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18 | var encode = function (arraybuffer) {
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19 | var bytes = new Uint8Array(arraybuffer), i, len = bytes.length, base64 = '';
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20 | for (i = 0; i < len; i += 3) {
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21 | base64 += chars[bytes[i] >> 2];
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22 | base64 += chars[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)];
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23 | base64 += chars[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];
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24 | base64 += chars[bytes[i + 2] & 63];
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25 | }
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26 | if (len % 3 === 2) {
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27 | base64 = base64.substring(0, base64.length - 1) + '=';
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28 | }
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29 | else if (len % 3 === 1) {
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30 | base64 = base64.substring(0, base64.length - 2) + '==';
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31 | }
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32 | return base64;
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33 | };
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34 | var decode = function (base64) {
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35 | var bufferLength = base64.length * 0.75, len = base64.length, i, p = 0, encoded1, encoded2, encoded3, encoded4;
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36 | if (base64[base64.length - 1] === '=') {
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37 | bufferLength--;
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38 | if (base64[base64.length - 2] === '=') {
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39 | bufferLength--;
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40 | }
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41 | }
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42 | var arraybuffer = new ArrayBuffer(bufferLength), bytes = new Uint8Array(arraybuffer);
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43 | for (i = 0; i < len; i += 4) {
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44 | encoded1 = lookup[base64.charCodeAt(i)];
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45 | encoded2 = lookup[base64.charCodeAt(i + 1)];
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46 | encoded3 = lookup[base64.charCodeAt(i + 2)];
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47 | encoded4 = lookup[base64.charCodeAt(i + 3)];
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48 | bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);
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49 | bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);
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50 | bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);
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51 | }
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52 | return arraybuffer;
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53 | };
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54 |
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55 | exports.decode = decode;
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56 | exports.encode = encode;
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57 |
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58 | Object.defineProperty(exports, '__esModule', { value: true });
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59 |
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60 | })));
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61 | //# sourceMappingURL=base64-arraybuffer.umd.js.map
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