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| 1 | +// This code was written by Tyler Akins and has been placed in the |
| 2 | +// public domain. It would be nice if you left this header intact. |
| 3 | +// Base64 code from Tyler Akins -- http://rumkin.com |
| 4 | + |
| 5 | +var Base64 = (function () { |
| 6 | + var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; |
| 7 | + |
| 8 | + var obj = { |
| 9 | + /** |
| 10 | + * Encodes a string in base64 |
| 11 | + * @param {String} input The string to encode in base64. |
| 12 | + */ |
| 13 | + encode: function (input) { |
| 14 | + var output = ""; |
| 15 | + var chr1, chr2, chr3; |
| 16 | + var enc1, enc2, enc3, enc4; |
| 17 | + var i = 0; |
| 18 | + |
| 19 | + do { |
| 20 | + chr1 = input.charCodeAt(i++); |
| 21 | + chr2 = input.charCodeAt(i++); |
| 22 | + chr3 = input.charCodeAt(i++); |
| 23 | + |
| 24 | + enc1 = chr1 >> 2; |
| 25 | + enc2 = ((chr1 & 3) << 4) | (chr2 >> 4); |
| 26 | + enc3 = ((chr2 & 15) << 2) | (chr3 >> 6); |
| 27 | + enc4 = chr3 & 63; |
| 28 | + |
| 29 | + if (isNaN(chr2)) { |
| 30 | + enc3 = enc4 = 64; |
| 31 | + } else if (isNaN(chr3)) { |
| 32 | + enc4 = 64; |
| 33 | + } |
| 34 | + |
| 35 | + output = output + keyStr.charAt(enc1) + keyStr.charAt(enc2) + |
| 36 | + keyStr.charAt(enc3) + keyStr.charAt(enc4); |
| 37 | + } while (i < input.length); |
| 38 | + |
| 39 | + return output; |
| 40 | + }, |
| 41 | + |
| 42 | + /** |
| 43 | + * Decodes a base64 string. |
| 44 | + * @param {String} input The string to decode. |
| 45 | + */ |
| 46 | + decode: function (input) { |
| 47 | + var output = ""; |
| 48 | + var chr1, chr2, chr3; |
| 49 | + var enc1, enc2, enc3, enc4; |
| 50 | + var i = 0; |
| 51 | + |
| 52 | + // remove all characters that are not A-Z, a-z, 0-9, +, /, or = |
| 53 | + input = input.replace(/[^A-Za-z0-9\+\/\=]/g, ""); |
| 54 | + |
| 55 | + do { |
| 56 | + enc1 = keyStr.indexOf(input.charAt(i++)); |
| 57 | + enc2 = keyStr.indexOf(input.charAt(i++)); |
| 58 | + enc3 = keyStr.indexOf(input.charAt(i++)); |
| 59 | + enc4 = keyStr.indexOf(input.charAt(i++)); |
| 60 | + |
| 61 | + chr1 = (enc1 << 2) | (enc2 >> 4); |
| 62 | + chr2 = ((enc2 & 15) << 4) | (enc3 >> 2); |
| 63 | + chr3 = ((enc3 & 3) << 6) | enc4; |
| 64 | + |
| 65 | + output = output + String.fromCharCode(chr1); |
| 66 | + |
| 67 | + if (enc3 != 64) { |
| 68 | + output = output + String.fromCharCode(chr2); |
| 69 | + } |
| 70 | + if (enc4 != 64) { |
| 71 | + output = output + String.fromCharCode(chr3); |
| 72 | + } |
| 73 | + } while (i < input.length); |
| 74 | + |
| 75 | + return output; |
| 76 | + } |
| 77 | + }; |
| 78 | + |
| 79 | + return obj; |
| 80 | +})(); |
| 81 | + |
| 82 | +window.Base64 = Base64 |
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