//To compile put this in a directory called jarnal and run javac jarnal/makebg.java from the superdirectory of the jarnal directory
//You will probably want to change the package name so you can put this in your own package

package jarnal;

import java.util.*;
import java.io.*;
import java.util.zip.*;
import javax.imageio.*;
import javax.imageio.stream.*;
import java.awt.image.BufferedImage;

public class makebg{

	public static boolean convert(InputStream in, OutputStream out){
		try{
			ImageInputStream iis = ImageIO.createImageInputStream (in);
			Iterator readers = ImageIO.getImageReaders(iis);
			int iind = 0;
			if(readers.hasNext()) {
				ZipOutputStream zip = new ZipOutputStream(out);
				ImageReader reader = (ImageReader)readers.next();
				reader.setInput (iis, false);
				ImageReadParam ip = reader.getDefaultReadParam();
                	        int np = reader.getNumImages(true);
 				for (int i = 0; i < np; i++){
                                	BufferedImage bg = reader.read (i, ip);
					if(bg != null){
						ZipEntry subname = new ZipEntry("p" + iind + ".jpg");
						zip.putNextEntry(subname);
						ImageIO.write(bg, "jpg", zip);
						iind++;
					} 
				}
				zip.close();
                        }
			else return false;
		}	
		catch(IOException ex){return false;}
		return false;
	}
}