mirror of
https://github.com/noDRM/DeDRM_tools.git
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41 lines
939 B
Python
41 lines
939 B
Python
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#!/usr/bin/python
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#
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# This is a python script. You need a Python interpreter to run it.
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# For example, ActiveState Python, which exists for windows.
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#
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# Changelog
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# 1.00 - Initial version
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__version__ = '1.00'
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import sys
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import struct
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import binascii
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def checksumPid(s):
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letters = "ABCDEFGHIJKLMNPQRSTUVWXYZ123456789"
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crc = (~binascii.crc32(s,-1))&0xFFFFFFFF
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crc = crc ^ (crc >> 16)
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res = s
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l = len(letters)
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for i in (0,1):
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b = crc & 0xff
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pos = (b // l) ^ (b % l)
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res += letters[pos%l]
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crc >>= 8
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return res
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if __name__ == "__main__":
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if len(sys.argv) != 2:
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print "Checks Mobipocket PID checksum"
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print "Usage:"
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print " %s <PID>" % sys.argv[0]
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sys.exit(1)
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else:
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pid = sys.argv[1]
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if len(pid) == 8:
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pid = checksumPid(pid)
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else:
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pid = checksumPid(pid[:8])
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print pid
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sys.exit(0)
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