J2Me .JAD file from JAR

>the java WTK only seems to work with jad files and not jar files, but phones only need the jar file. So I think the information is found in the MANIFEST.MF so I wrote a script that converts the manifest to a .jad file. It has to add two lines.

#!/usr/bin/env python

import os,sys,subprocess

def ExtractJad(fname):
	"""This will extract read the manifest-nf and create a jad file that can be loaded by the loader"""
	
	#tests
	check = True
	if os.path.exists("META-INF") or os.path.exists("META-INF/MANIFEST.MF"):
		check = False
		print "There is already a META-INF directory"
	
	if not (os.path.exists(fname) and fname.endswith('.jar')):
		check = False
		print "invalid filename/file does not exist"
	
	if check:
		prog = subprocess.Popen(['jar','-xf',fname,"META-INF/MANIFEST.MF"])
		rc = prog.wait()
		if rc==0:
			newname = fname.replace('jar','jad')
			outdata = "MIDlet-Jar-Size: 100\nMIDlet-Jar-URL: %s\n"%fname
			oldmanifest = open("META-INF/MANIFEST.MF",'r').read()
			outdata += oldmanifest
			newjad = open(newname,'w')
			newjad.write(outdata)
			newjad.close()
			os.unlink("META-INF/MANIFEST.MF")
			os.rmdir("META-INF")
		else:
			print "the .jar did not extract correctly"
try:
	for item in sys.argv[1:]:
		ExtractJad(item)
except IndexError:
	print "usage: mjad.py filename.jar"

or you could d/load the file from here mjad.py.

For the record this only makes a jad file for a working j2me jar file. If you want to make the jar file, then you should get the java WTK tool kit.