Arkanoid TVI 'Isles.dat' extractor

extractor.py

import re
import struct
import zlib
import os

def ensure_dir(f):
    d = os.path.dirname(f)
    if not os.path.exists(d):
        os.makedirs(d)

data = open('Isles.dat').read()

locations = [m.start() - 3 for m in re.finditer('\x00\xa0\x20\x14\x00', data)]

for loc in locations:
    fnloc, tag, data_till, _ = struct.unpack('<LLLL', data[loc:loc+16])
    assert tag == 0x1420a0
    fn = data[fnloc:fnloc+30].split('\x00')[0].replace('\\', '/')
    print fn
    data_start = fnloc + len(fn) + 1

    compressed = data[data_start:data_till-1]
    content = zlib.decompress(compressed)

    ensure_dir(fn)
    open(fn, 'wb').write(content)