Mercurial > support-chat / file comparison
comparison: js/strophe/b64.js
js/strophe/b64.js
- changeset 18
- 9e4230bb66e4
- parent 17
- 6344a9a20da2
- child 19
- 41a3c9d41e6a
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| 17:6344a9a20da2 | 18:9e4230bb66e4 |
|---|---|
| 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 keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; | |
| 6 | |
| 7 /** | |
| 8 * Encodes a string in base64 | |
| 9 * @param {String} input The string to encode in base64. | |
| 10 */ | |
| 11 function encode64(input) { | |
| 12 var output = ""; | |
| 13 var chr1, chr2, chr3; | |
| 14 var enc1, enc2, enc3, enc4; | |
| 15 var i = 0; | |
| 16 | |
| 17 do { | |
| 18 chr1 = input.charCodeAt(i++); | |
| 19 chr2 = input.charCodeAt(i++); | |
| 20 chr3 = input.charCodeAt(i++); | |
| 21 | |
| 22 enc1 = chr1 >> 2; | |
| 23 enc2 = ((chr1 & 3) << 4) | (chr2 >> 4); | |
| 24 enc3 = ((chr2 & 15) << 2) | (chr3 >> 6); | |
| 25 enc4 = chr3 & 63; | |
| 26 | |
| 27 if (isNaN(chr2)) { | |
| 28 enc3 = enc4 = 64; | |
| 29 } else if (isNaN(chr3)) { | |
| 30 enc4 = 64; | |
| 31 } | |
| 32 | |
| 33 output = output + keyStr.charAt(enc1) + keyStr.charAt(enc2) + | |
| 34 keyStr.charAt(enc3) + keyStr.charAt(enc4); | |
| 35 } while (i < input.length); | |
| 36 | |
| 37 return output; | |
| 38 } | |
| 39 | |
| 40 /** | |
| 41 * Decodes a base64 string. | |
| 42 * @param {String} input The string to decode. | |
| 43 */ | |
| 44 function decode64(input) { | |
| 45 var output = ""; | |
| 46 var chr1, chr2, chr3; | |
| 47 var enc1, enc2, enc3, enc4; | |
| 48 var i = 0; | |
| 49 | |
| 50 // remove all characters that are not A-Z, a-z, 0-9, +, /, or = | |
| 51 input = input.replace(/[^A-Za-z0-9\+\/\=]/g, ""); | |
| 52 | |
| 53 do { | |
| 54 enc1 = keyStr.indexOf(input.charAt(i++)); | |
| 55 enc2 = keyStr.indexOf(input.charAt(i++)); | |
| 56 enc3 = keyStr.indexOf(input.charAt(i++)); | |
| 57 enc4 = keyStr.indexOf(input.charAt(i++)); | |
| 58 | |
| 59 chr1 = (enc1 << 2) | (enc2 >> 4); | |
| 60 chr2 = ((enc2 & 15) << 4) | (enc3 >> 2); | |
| 61 chr3 = ((enc3 & 3) << 6) | enc4; | |
| 62 | |
| 63 output = output + String.fromCharCode(chr1); | |
| 64 | |
| 65 if (enc3 != 64) { | |
| 66 output = output + String.fromCharCode(chr2); | |
| 67 } | |
| 68 if (enc4 != 64) { | |
| 69 output = output + String.fromCharCode(chr3); | |
| 70 } | |
| 71 } while (i < input.length); | |
| 72 | |
| 73 return output; | |
| 74 } |
