Base64 Encoding in ActionScript

ActionScript provides built-in support for base64 encoding/decoding through the Base64Encoder and Base64Decoder classes in the mx.utils package.

package {
    import flash.display.Sprite;
    import flash.utils.ByteArray;
    import mx.utils.Base64Encoder;
    import mx.utils.Base64Decoder;

    public class Base64EncodingExample extends Sprite {
        public function Base64EncodingExample() {
            // Here's the string we'll encode/decode.
            var data:String = "abc123!?$*&()'-=@~";

            // ActionScript uses Base64Encoder for encoding
            var encoder:Base64Encoder = new Base64Encoder();
            encoder.encode(data);
            var sEnc:String = encoder.toString();
            trace(sEnc);

            // Decoding using Base64Decoder
            var decoder:Base64Decoder = new Base64Decoder();
            decoder.decode(sEnc);
            var sDec:String = decoder.toByteArray().toString();
            trace(sDec);
            trace();

            // ActionScript doesn't have a built-in URL-safe Base64 encoding
            // You would need to implement it yourself or use a third-party library
            // Here's a simple implementation for demonstration:
            var uEnc:String = encodeURLSafe(data);
            trace(uEnc);
            var uDec:String = decodeURLSafe(uEnc);
            trace(uDec);
        }

        private function encodeURLSafe(input:String):String {
            var encoder:Base64Encoder = new Base64Encoder();
            encoder.encode(input);
            return encoder.toString().replace(/\+/g, "-").replace(/\//g, "_").replace(/=/g, "");
        }

        private function decodeURLSafe(input:String):String {
            var decoder:Base64Decoder = new Base64Decoder();
            input = input.replace(/-/g, "+").replace(/_/g, "/");
            while (input.length % 4 != 0) {
                input += "=";
            }
            decoder.decode(input);
            return decoder.toByteArray().toString();
        }
    }
}

To run this ActionScript program, you would typically compile it into a SWF file and run it in a Flash Player or AIR runtime environment. The output would be similar to:

YWJjMTIzIT8kKiYoKSctPUB+
abc123!?$*&()'-=@~

YWJjMTIzIT8kKiYoKSctPUB-
abc123!?$*&()'-=@~

Note that ActionScript’s built-in Base64 encoding is similar to the standard encoding in other languages. For URL-safe encoding, we’ve implemented a simple conversion that replaces + with -, / with _, and removes padding = characters. This is a common approach for making Base64 strings safe for use in URLs.

Unlike some other languages, ActionScript doesn’t provide a built-in URL-safe Base64 encoding, so you might need to implement it yourself or use a third-party library in real-world applications.

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Base64 Encoding in ActionScript