Base64.as

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class gugga.crypt.Base64 {

        private static var base64chars:String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

        public static function encode(src:String):String {
                var i:Number = 0;
                var output:String = new String("");
                var chr1:Number, chr2:Number, chr3:Number;
                var enc1:Number, enc2:Number, enc3:Number, enc4:Number;
                while (i < src.length) {
                        chr1 = src.charCodeAt(i++);
                        chr2 = src.charCodeAt(i++);
                        chr3 = src.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 += base64chars.charAt(enc1)+base64chars.charAt(enc2);
                        output += base64chars.charAt(enc3)+base64chars.charAt(enc4);
                }
                return output;
        }

        public static function decode(src:String):String {
                var i:Number = 0;
                var output:String = new String("");
                var chr1:Number, chr2:Number, chr3:Number;
                var enc1:Number, enc2:Number, enc3:Number, enc4:Number;
                while (i < src.length) {
                        enc1 = base64chars.indexOf(src.charAt(i++));
                        enc2 = base64chars.indexOf(src.charAt(i++));
                        enc3 = base64chars.indexOf(src.charAt(i++));
                        enc4 = base64chars.indexOf(src.charAt(i++));
                        chr1 = (enc1 << 2) | (enc2 >> 4);
                        chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
                        chr3 = ((enc3 & 3) << 6) | enc4;
                        output += String.fromCharCode(chr1);
                        if (enc3 != 64) output = output+String.fromCharCode(chr2);
                        if (enc4 != 64) output = output+String.fromCharCode(chr3);
                }
                return output;
        }

}

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