/*
 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

// /*
// Workfile:@(#)HelloWorld.java	1.7
// Version:1.7
// Date:01/03/06
// 
// Archive:  /Products/Europa/samples/com/sun/javacard/samples/HelloWorld/HelloWorld.java 
// Modified:01/03/06 19:01:06
// Original author:  Mitch Butler
// */

package com.sun.javacard.samples.HelloWorld;

import javacard.framework.*;

/**
 */

public class HelloWorld extends Applet
{
    private byte[] echoBytes;
    private static final short LENGTH_ECHO_BYTES = 256;

    /**
     * Only this class's install method should create the applet object.
     */
    protected HelloWorld()
    {
        echoBytes = new byte[LENGTH_ECHO_BYTES];
        register();
    }

    /**
     * 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
     */
    public static void install(byte[] bArray, short bOffset, byte bLength)
    {
        new HelloWorld();
    }

    /**
     * Processes an incoming APDU.
     * @see APDU
     * @param apdu the incoming APDU
     * @exception ISOException with the response bytes per ISO 7816-4
     */
    public void process(APDU apdu)
    {
        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 );
    }

}