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Fix FPT checksum calculation for ME11

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This commit is contained in:
Nicola Corna 2017-05-03 14:33:20 +02:00
parent ba885fa9fc
commit 518445323b
1 changed files with 3 additions and 1 deletions
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4
me_cleaner.py
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@ -421,10 +421,12 @@ if __name__ == "__main__":
if me11:
mef.seek(me_start + 0x10)
header = bytearray(mef.read(0x20))
header[0x0b] = 0x00
else:
mef.seek(me_start)
header = bytearray(mef.read(0x30))
checksum = (0x100 - (sum(header) - header[0x1b]) & 0xff) & 0xff
header[0x1b] = 0x00
checksum = (0x100 - sum(header) & 0xff) & 0xff
print("Correcting checksum (0x{:02x})...".format(checksum))
# The checksum is just the two's complement of the sum of the first