unpackspk.py

import os, struct, sys

def main(fn, odir):
	fp = file(fn, 'rb')
	fp.seek(0, 2)
	flen = fp.tell()
	fp.seek(flen - 10, 0)
	n, n2 = struct.unpack('<II', fp.read(8))
	assert n <= flen and n2 <= flen
	n3 = flen - n - n2 - 22
	maximum = flen - n - 22
	fp.seek(maximum, 0)
	n4 = flen - 22
	n5 = 0
	while fp.tell() < n4:
		fp.read(20)
		n6, n7, intl = struct.unpack('<III', fp.read(12))
		fp.read(10)
		value = struct.unpack('<I', fp.read(4))[0] + n3 + 66 + intl
		fn = fp.read(intl)
		print '%r - %x %x %x' % (fn, value, n6, n7)
		assert n6 == n7
		if '/' in fn:
			dn = odir + '/' + fn.rsplit('/', 1)[0]
			try:
				os.makedirs(dn)
			except:
				pass
		pre = fp.tell()
		with file(odir + '/' + fn, 'wb') as zfp:
			fp.seek(value, 0)
			zfp.write(fp.read(n6))
		fp.seek(pre, 0)
		n5 += 1

if __name__=='__main__':
	main(*sys.argv[1:])