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// This code was written by Tyler Akins and has been placed in the | ||
// public domain. It would be nice if you left this header intact. | ||
// Base64 code from Tyler Akins -- http://rumkin.com | ||
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var Base64 = (function () { | ||
var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; | ||
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var obj = { | ||
/** | ||
* Encodes a string in base64 | ||
* @param {String} input The string to encode in base64. | ||
*/ | ||
encode: function (input) { | ||
var output = ""; | ||
var chr1, chr2, chr3; | ||
var enc1, enc2, enc3, enc4; | ||
var i = 0; | ||
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do { | ||
chr1 = input.charCodeAt(i++); | ||
chr2 = input.charCodeAt(i++); | ||
chr3 = input.charCodeAt(i++); | ||
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enc1 = chr1 >> 2; | ||
enc2 = ((chr1 & 3) << 4) | (chr2 >> 4); | ||
enc3 = ((chr2 & 15) << 2) | (chr3 >> 6); | ||
enc4 = chr3 & 63; | ||
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if (isNaN(chr2)) { | ||
enc3 = enc4 = 64; | ||
} else if (isNaN(chr3)) { | ||
enc4 = 64; | ||
} | ||
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output = output + keyStr.charAt(enc1) + keyStr.charAt(enc2) + | ||
keyStr.charAt(enc3) + keyStr.charAt(enc4); | ||
} while (i < input.length); | ||
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return output; | ||
}, | ||
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/** | ||
* Decodes a base64 string. | ||
* @param {String} input The string to decode. | ||
*/ | ||
decode: function (input) { | ||
var output = ""; | ||
var chr1, chr2, chr3; | ||
var enc1, enc2, enc3, enc4; | ||
var i = 0; | ||
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// remove all characters that are not A-Z, a-z, 0-9, +, /, or = | ||
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, ""); | ||
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do { | ||
enc1 = keyStr.indexOf(input.charAt(i++)); | ||
enc2 = keyStr.indexOf(input.charAt(i++)); | ||
enc3 = keyStr.indexOf(input.charAt(i++)); | ||
enc4 = keyStr.indexOf(input.charAt(i++)); | ||
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chr1 = (enc1 << 2) | (enc2 >> 4); | ||
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2); | ||
chr3 = ((enc3 & 3) << 6) | enc4; | ||
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output = output + String.fromCharCode(chr1); | ||
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if (enc3 != 64) { | ||
output = output + String.fromCharCode(chr2); | ||
} | ||
if (enc4 != 64) { | ||
output = output + String.fromCharCode(chr3); | ||
} | ||
} while (i < input.length); | ||
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return output; | ||
} | ||
}; | ||
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return obj; | ||
})(); | ||
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window.Base64 = Base64 |
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