/* MrBean.java by Mark D. LaDue */

/* December 7, 1997 */

/* Copyright (c) 1997 Mark D. LaDue
   You may study, use, modify, and distribute this example for any purpose.
   This example is provided WITHOUT WARRANTY either expressed or implied.  */

/* This Java application hacks the class MainPanel.class of Sun's HotJava
   HTML Component Version 1.1.1.  In this case, the Maginot licensing
   software is harmless and works as follows.  Each time you use the beans
   in HotJavaBean.jar to construct a browser in the BDK BeanBox, when
   the HotJavaBrowserBean class is loaded, it will pop up a window with the
   following message:

   "Notice: This is an evaluation copy of the
   HotJava Browser software.  The evaluation license
   expires 30 days after initial installation.  Please
   visit the JavaSoft web site at

   http://java.sun.com/products/hotjava

   for additional licensing information."

   It will also call System.err.println() to print the same message to
   stderr.  By changing two bytes in MainPanel.class, we disable the
   licensing software and avoid the annoying messages.

   To use this Java application, do the following:

   1. Create a new folder, say HotJavaBean, and place in it a copy of the
      jar file HotJavaBean.jar.

   2. Move into the new folder, HotJavaBean, and issue the command:
      jar xvf HotJavaBean.jar

      Note: You may have to do this twice in order for it to work.
      It's java, so go figure.

   3. Compile MrBean.java to obtain MrBean.class.

   4. Place MrBean.class in the new folder in which you "unjarred"
      HotJavaBean.jar.

   5. Run the program with the command "java MrBean".  This changes the
      necessary bytes in MainPanel.class.

   6. Create a file, call it MRBEAN.MF, in the new folder, HotJavaBean,
      and put the following text in it:

Name: sunw/hotjava/bean/HotJavaDocumentStack.class
Java-Bean: True

Name: sunw/hotjava/bean/AuthenticatorBean.class
Java-Bean: True

Name: sunw/hotjava/bean/HotJavaSystemState.class
Java-Bean: True

Name: sunw/hotjava/bean/HotJavaBrowserBean.class
Java-Bean: True

   7. Create a new jar file using the following command:
      jar cvmf MRBRAN.MF HotJavaBean.jar sunw lib hjResourceBundle.properties

      Note: If your platform produces different files and folders when it's
      "unjarred," you should "jar" all but the folder META-INF

   8. Place the resulting file, HotJavaBean.jar, in the "jar" folder of the
      BDK, and remove any files in the folder HotJavaBean that you don't
      want to keep.

   Now when you create browsers in the BeanBox, they no longer pop up
   the annoying frame and print messages about licensing to stderr.
   Had the licensing software been rigged as a logic bomb to disable
   software with an expired license, we could just as easily have
   disarmed it.*/

import java.io.*;

class MrBean {
    public static void main(String[] argv) {

        String sep = System.getProperty("file.separator");
        String hack = "sunw" + sep + "hotjava" + sep + "bean" + sep + "MainPanel.class";

        try {

// Start by opening the file for reading and writing
            RandomAccessFile victim = new RandomAccessFile(hack, "rw");

// Put an "iconst_0" instruction (opcode 3) in place of the "iconst_1"
// instruction (opcode 4) at byte 1801
            victim.seek(1800);
            victim.writeByte(3);

// Put a "goto" instruction (opcode 167) in place of the "ifnonnull"
// instruction (opcode 199) at byte 1981
            victim.seek(1980);
            victim.writeByte(167);

// That's all for now
            victim.close();
        } catch (IOException ioe) {System.err.println("Oops!");}
    System.out.println("MainPanel.class has been hacked successfully.");
    }
}