/**
   * 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 (no longer available?)
   * @link https://gist.github.com/gists/1602210
   * @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);