Little script to extract info from some TV firmwares

firmware.py

"""
Extract information about some TV firmware

http://neophob.com/2010/01/root-my-tv-hack-philips-pfl9703/

$ python firm.py firmware.upd 

magic1:      2SWU
magic2:      3TXV
header size: 760
data size:   36144376
crc:         1865288756
description: SecureOND_M8R728_M8.728.upg
signature:   7432c7c5fcbbf44b552f226a0cae07dc3970dddc0ceb84d38f9d305b542791bbae3722703c117b54191deaf6ab0dbd08d66c07f58d0589fff4b38fa3d45b103c898f0fe3d4720edc64bd79cc2d2a2a7ef35a98d235586f28f1721c062dc63c1e6fbd8563cd8cbb51edfc2086dcc0004684e1b820452253fbbdc888722da99e7b10c66535f0ad5a9742869da1ee6b71d770b9511f2b14deddffac1b5c1dbedc70
release:     M 8.728
"""
import struct
import sys

if __name__ == "__main__":
    if len(sys.argv) < 2:
        print >> sys.stderr, "usage: %s <firmware file>" % sys.argv[0]
        sys.exit(1)

    with open(sys.argv[1]) as f:
        data = f.read()
        magic1 = data[0:4]
        magic2 = data[4:8]
        offset = 8
        header_size = struct.unpack("I", data[offset:offset + 4])[0]
        offset += 4
        data_size   = struct.unpack("I", data[offset:offset + 4])[0]
        offset += 4
        crc         = struct.unpack("I", data[offset:offset + 4])[0]
        offset += 16
        description = data[offset:offset + 512]
        offset += 512
        signature = "".join(["%02x" % ord(x) for x in data[offset:offset + 160]])
        offset += 160
        release_string = data[offset:offset + 28]

        print """
magic1:      %s
magic2:      %s
header size: %d
data size:   %d
crc:         %d
description: %s
signature:   %s
release:     %s
        """ % (magic1, magic2, header_size, data_size, crc, description, signature, release_string,)