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