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HelloWorld.javaAPI DocJava Card1973Wed Mar 22 21:07:24 GMT 2006com.sun.javacard.samples.HelloWorld

HelloWorld

public class HelloWorld extends Applet

Fields Summary
private byte[]
echoBytes
private static final short
LENGTH_ECHO_BYTES
Constructors Summary
protected HelloWorld()
Only this class's install method should create the applet object.


                   
     
    
        echoBytes = new byte[LENGTH_ECHO_BYTES];
        register();
Methods Summary
public static voidinstall(byte[] bArray, short bOffset, byte bLength)
Installs this applet.

param
bArray the array containing installation parameters
param
bOffset the starting offset in bArray
param
bLength the length in bytes of the parameter data in bArray

        new HelloWorld();
public voidprocess(APDU apdu)
Processes an incoming APDU.

see
APDU
param
apdu the incoming APDU
exception
ISOException with the response bytes per ISO 7816-4

        byte buffer[] = apdu.getBuffer();

		short bytesRead = apdu.setIncomingAndReceive();
		short echoOffset = (short)0;

		while ( bytesRead > 0 ) {
            Util.arrayCopyNonAtomic(buffer, ISO7816.OFFSET_CDATA, echoBytes, echoOffset, bytesRead);
            echoOffset += bytesRead;
            bytesRead = apdu.receiveBytes(ISO7816.OFFSET_CDATA);
        }

        apdu.setOutgoing();
        apdu.setOutgoingLength( (short) (echoOffset + 5) );

        // echo header
        apdu.sendBytes( (short)0, (short) 5);
        // echo data
        apdu.sendBytesLong( echoBytes, (short) 0, echoOffset );