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comparison cutils/treesum.py @ 206:73d22943da5a

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FIX: CRC-32 validation on Python2.7: normalize to positive numbers
author Franz Glasner <fzglas.hg@dom66.de>
date Wed, 22 Jan 2025 17:55:49 +0100
parents 63088d3675bb
children 0e8c12ff0f41
comparison
equal deleted inserted replaced
205:63088d3675bb 206:73d22943da5a
997 997
998 def _update_crc(self, data): 998 def _update_crc(self, data):
999 self._crc32 = zlib.crc32(data, self._crc32) 999 self._crc32 = zlib.crc32(data, self._crc32)
1000 1000
1001 def _hex_crc(self): 1001 def _hex_crc(self):
1002 return (hex(self._crc32)[2:]).upper() 1002 return (hex(self._get_crc())[2:]).upper()
1003
1004 def _get_crc(self):
1005 """Get the current CRC always as positive number with the same bit#
1006 pattern because Python2 yields negative numbers also.
1007
1008 :return: The current CRC value as positive number on all Python
1009 versions
1010 :rtype: int
1011
1012 """
1013 if util.PY2:
1014 # Return the bitpattern as unsigned 32-bit number
1015 return (~self._crc32 ^ 0xFFFFFFFF)
1016 else:
1017 return self._crc32
1003 1018
1004 def _get_digest_size(self, algo_name): 1019 def _get_digest_size(self, algo_name):
1005 if self._current_algo_name == algo_name: 1020 if self._current_algo_name == algo_name:
1006 return self._current_algo_digest_size 1021 return self._current_algo_digest_size
1007 h = util.algotag2algotype(algo_name)() 1022 h = util.algotag2algotype(algo_name)()