/**
  * jQuery BASE64 functions
  * 
  *  <code>
  *   Encodes the given data with base64. 
  *   String $.base64Encode ( String str )
  *  <br />
  *   Decodes a base64 encoded data.
  *   String $.base64Decode ( String str )
  *  </code>
  * 
  * Encodes and Decodes the given data in base64.
  * This encoding is designed to make binary data survive transport through transport layers that are not 8-bit clean, such as mail bodies.
  * Base64-encoded data takes about 33% more space than the original data. 
  * This javascript code is used to encode / decode data using base64 (this encoding is designed to make binary data survive transport through transport layers that are not 8-bit clean). Script is fully compatible with UTF-8 encoding. You can use base64 encoded data as simple encryption mechanism.
  * If you plan using UTF-8 encoding in your project don't forget to set the page encoding to UTF-8 (Content-Type meta tag). 
  * This function orginally get from the WebToolkit and rewrite for using as the jQuery plugin.
  * 
  * Example
  *  Code
  *   <code>
  *    $.base64Encode("I'm Persian."); 
  *   </code>
  *  Result
  *   <code>
  *    "SSdtIFBlcnNpYW4u"
  *   </code>
  *  Code
  *   <code>
  *    $.base64Decode("SSdtIFBlcnNpYW4u");
  *   </code>
  *  Result
  *   <code>
  *    "I'm Persian."
  *   </code>
  * 
  * @alias Muhammad Hussein Fattahizadeh < muhammad [AT] semnanweb [DOT] com >
  * @link http://www.semnanweb.com/jquery-plugin/base64.html
  * @see http://www.webtoolkit.info/
  * @license http://www.gnu.org/licenses/gpl.html [GNU General Public License]
  * @param {jQuery} {base64Encode:function(input))
  * @param {jQuery} {base64Decode:function(input))
  * @return string
  */
 
 (function($){
  
  var keyString = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
  
  var uTF8Encode = function(string) {
   string = string.replace(/\x0d\x0a/g, "\x0a");
   var output = "";
   for (var n = 0; n < string.length; n++) {
    var c = string.charCodeAt(n);
    if (c < 128) {
     output += String.fromCharCode(c);
    } else if ((c > 127) && (c < 2048)) {
     output += String.fromCharCode((c >> 6) | 192);
     output += String.fromCharCode((c & 63) | 128);
    } else {
     output += String.fromCharCode((c >> 12) | 224);
     output += String.fromCharCode(((c >> 6) & 63) | 128);
     output += String.fromCharCode((c & 63) | 128);
    }
   }
   return output;
  };
  
  var uTF8Decode = function(input) {
   var string = "";
   var i = 0;
   var c = c1 = c2 = 0;
   while ( i < input.length ) {
    c = input.charCodeAt(i);
    if (c < 128) {
     string += String.fromCharCode(c);
     i++;
    } else if ((c > 191) && (c < 224)) {
     c2 = input.charCodeAt(i+1);
     string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
     i += 2;
    } else {
     c2 = input.charCodeAt(i+1);
     c3 = input.charCodeAt(i+2);
     string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
     i += 3;
    }
   }
   return string;
  }
  
  $.extend({
   base64Encode: function(input) {
    var output = "";
    var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
    var i = 0;
    input = uTF8Encode(input);
    while (i < input.length) {
     chr1 = input.charCodeAt(i++);
     chr2 = input.charCodeAt(i++);
     chr3 = input.charCodeAt(i++);
     enc1 = chr1 >> 2;
     enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
     enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
     enc4 = chr3 & 63;
     if (isNaN(chr2)) {
      enc3 = enc4 = 64;
     } else if (isNaN(chr3)) {
      enc4 = 64;
     }
     output = output + keyString.charAt(enc1) + keyString.charAt(enc2) + keyString.charAt(enc3) + keyString.charAt(enc4);
    }
    return output;
   },
   base64Decode: function(input) {
    var output = "";
    var chr1, chr2, chr3;
    var enc1, enc2, enc3, enc4;
    var i = 0;
    input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
    while (i < input.length) {
     enc1 = keyString.indexOf(input.charAt(i++));
     enc2 = keyString.indexOf(input.charAt(i++));
     enc3 = keyString.indexOf(input.charAt(i++));
     enc4 = keyString.indexOf(input.charAt(i++));
     chr1 = (enc1 << 2) | (enc2 >> 4);
     chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
     chr3 = ((enc3 & 3) << 6) | enc4;
     output = output + String.fromCharCode(chr1);
     if (enc3 != 64) {
      output = output + String.fromCharCode(chr2);
     }
     if (enc4 != 64) {
      output = output + String.fromCharCode(chr3);
     }
    }
    output = uTF8Decode(output);
    return output;
   }
  });
 })(jQuery);