import java.io.*;
import java.util.*;
import java.util.jar.*;

public class DetectGIFAR {
    public static void main (String args[]) 
         throws IOException {
		
		if(args.length != 1)
		{
			System.out.println("Usage: java DetectGIFAR image_file");
			System.exit(1);
		}
		
		try
		{
			JarFile jarFile = new JarFile(args[0]);
			System.out.println("This is a malicious image with embedded jar content.\nFollowing are the contents:-");
			Enumeration jarenum = jarFile.entries();
			while (jarenum.hasMoreElements()) {
				JarEntry jarent = (JarEntry) jarenum.nextElement();
				System.out.println(jarent.getName() + ", " + jarent.getSize() + " bytes");
			}	
		}
		catch(java.util.zip.ZipException e)
		{
			System.out.println("This is a benign image file. No jar content detected.");
			System.exit(0);
		}
		catch (Exception e)
		{
			System.out.println("Error occured. Unable to process GIFAR contents.");
		}
	}
}