﻿/**
* 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);
