/*
	$Id: Base64Utils.js 4294 2007-12-18 04:02:57Z mjhorne $

	This file is part of ayudaCMS
	Copyright 2007: ayuda IT
	http://www.ayuda.com.au

	For licencing details, please see LICENCE.txt in the ayudaCMS directory.
*/

	/*************************************************************************/
	/** Base64 Util class													**/
	/**																		**/ 
	/** Adapted from http://www.webtoolkit.info/javascript-base64.html		**/
	/*************************************************************************/

	function Base64Utils() {}

	Base64Utils.prototype.keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

    Base64Utils.prototype.encode =  function (input) 
	{
        var output = "";
        var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
        var i = 0;

        input = Base64Utils.prototype.utf8_encode(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 +
            Base64Utils.prototype.keyStr.charAt(enc1) + Base64Utils.prototype.keyStr.charAt(enc2) +
            Base64Utils.prototype.keyStr.charAt(enc3) + Base64Utils.prototype.keyStr.charAt(enc4);

        }

        return output;
    }

	Base64Utils.prototype.decode = 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 = Base64Utils.prototype.keyStr.indexOf(input.charAt(i++));
            enc2 = Base64Utils.prototype.keyStr.indexOf(input.charAt(i++));
            enc3 = Base64Utils.prototype.keyStr.indexOf(input.charAt(i++));
            enc4 = Base64Utils.prototype.keyStr.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 = Base64Utils.prototype.utf8_decode(output);

        return output;
	}


    Base64Utils.prototype.utf8_encode = function (string) 
	{
        string = string.replace(/\r\n/g,"\n");
        var utftext = "";

        for(var n = 0; n < string.length; n++) 
		{
            var c = string.charCodeAt(n);

            if (c < 128) 
			{
                utftext += String.fromCharCode(c);
            }
            else if((c > 127) && (c < 2048))
			{
                utftext += String.fromCharCode((c >> 6) | 192);
                utftext += String.fromCharCode((c & 63) | 128);
            }
            else
			{
                utftext += String.fromCharCode((c >> 12) | 224);
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                utftext += String.fromCharCode((c & 63) | 128);
            }
        }

        return utftext;
    }


    Base64Utils.prototype.utf8_decode = function (utftext) 
	{
        var string = "";
        var i = 0;
        var c = c1 = c2 = 0;

        while(i < utftext.length ) 
		{
            c = utftext.charCodeAt(i);

            if (c < 128) 
			{
                string += String.fromCharCode(c);
                i++;
            }
            else if((c > 191) && (c < 224)) 
			{
                c2 = utftext.charCodeAt(i+1);
                string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                i += 2;
            }
            else 
			{
                c2 = utftext.charCodeAt(i+1);
                c3 = utftext.charCodeAt(i+2);
                string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                i += 3;
            }
        }
        return string;
    }