cpkunf.py

# cpkunf.py - PES2018 CPK unfucker by f4r - 17/9/17 - v0.1
# Some CPKs in PES2018 have the header about halfway though the file, like they have been cut in half and swapped.
# I call thses "fucked" cpks. This is a quick-and-dirty un-fucker so you can browse and edit them again.
# Unfucked CPKs are written as .unf.cpk.
# Thanks to Tomato and Shakes.
# This has only been tested on python2.
import mmap
import sys

infile = sys.argv[1]
outfilen = infile[:-4] + ".unf.cpk"

with open(infile, "r+b") as f:
    mm = mmap.mmap(f.fileno(), 0)
    loc = mm.find('\x43\x50\x4b\x20\x00\x00\x00\x00')
    if loc == 0:
        print "CPK header found at offset 0, this isn't a fucked CPK. Exiting..."
        sys.exit(0)
    elif loc == -1:
        print "No valid CPK header found. Exiting..."
        sys.exit(0)

    print "CPK header found at offset", format(loc, '#04x') + ", unfucking.",
    outfile = open(outfilen, "wb")
    f.seek(loc)
    outfile.write(f.read())
    print ".",
    f.seek(0)
    outfile.write(f.read(loc))
    print ".",
    outfile.close()

print " done."
sys.exit(0)