/**
 * 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);