import binascii
import zlib
from hexdump import hexdump
import crcmod


infile = open("sound_packs/Uno_Drum_lib_Factory.dfu", "rb")
#infile = open("repack.dfu", "rb")

data = infile.read()

checksum = int.from_bytes(data[-4:],byteorder='little')
print("Stated checksum", hex(checksum))
print("inverted", hex(checksum ^ 0xffffffff))

for start in range(5000):
    crc32 = crcmod.Crc(0x104c11db7, initCrc=0, xorOut=0xFFFFFFFF)
    crc32.update(data[start:-4])

    if (crc32.crcValue == checksum):
        print("Match @", start, crc32.hexdigest())
    if (crc32.crcValue == checksum ^ 0xffffffff):
        print("Inverted Match @", start, crc32.hexdigest())

    adler = zlib.adler32(data[start:-4])

    if (adler == checksum):
        print("Match @", start, hex(adler))
    if (adler == checksum ^ 0xffffffff):
        print("Inverted Match @", start, hex(adler))