source: trip-planner-front/node_modules/base64-arraybuffer/lib/base64-arraybuffer.js@ 6a3a178

Last change on this file since 6a3a178 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 1.7 KB
Line 
1/*
2 * base64-arraybuffer
3 * https://github.com/niklasvh/base64-arraybuffer
4 *
5 * Copyright (c) 2012 Niklas von Hertzen
6 * Licensed under the MIT license.
7 */
8(function(chars){
9 "use strict";
10
11 exports.encode = function(arraybuffer) {
12 var bytes = new Uint8Array(arraybuffer),
13 i, len = bytes.length, base64 = "";
14
15 for (i = 0; i < len; i+=3) {
16 base64 += chars[bytes[i] >> 2];
17 base64 += chars[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)];
18 base64 += chars[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];
19 base64 += chars[bytes[i + 2] & 63];
20 }
21
22 if ((len % 3) === 2) {
23 base64 = base64.substring(0, base64.length - 1) + "=";
24 } else if (len % 3 === 1) {
25 base64 = base64.substring(0, base64.length - 2) + "==";
26 }
27
28 return base64;
29 };
30
31 exports.decode = function(base64) {
32 var bufferLength = base64.length * 0.75,
33 len = base64.length, i, p = 0,
34 encoded1, encoded2, encoded3, encoded4;
35
36 if (base64[base64.length - 1] === "=") {
37 bufferLength--;
38 if (base64[base64.length - 2] === "=") {
39 bufferLength--;
40 }
41 }
42
43 var arraybuffer = new ArrayBuffer(bufferLength),
44 bytes = new Uint8Array(arraybuffer);
45
46 for (i = 0; i < len; i+=4) {
47 encoded1 = chars.indexOf(base64[i]);
48 encoded2 = chars.indexOf(base64[i+1]);
49 encoded3 = chars.indexOf(base64[i+2]);
50 encoded4 = chars.indexOf(base64[i+3]);
51
52 bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);
53 bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);
54 bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);
55 }
56
57 return arraybuffer;
58 };
59})("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/");
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