Mercurial > hgrepos > Python > apps > py-cutils

changeset 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
files cutils/treesum.py
diffstat 1 files changed, 16 insertions(+), 1 deletions(-) [+]
line wrap: on
line diff
--- a/cutils/treesum.py	Wed Jan 22 17:45:37 2025 +0100
+++ b/cutils/treesum.py	Wed Jan 22 17:55:49 2025 +0100
@@ -999,7 +999,22 @@
         self._crc32 = zlib.crc32(data, self._crc32)
 
     def _hex_crc(self):
-        return (hex(self._crc32)[2:]).upper()
+        return (hex(self._get_crc())[2:]).upper()
+
+    def _get_crc(self):
+        """Get the current CRC always as positive number with the same bit#
+        pattern because Python2 yields negative numbers also.
+
+        :return: The current CRC value as positive  number on all Python
+                 versions
+        :rtype: int
+
+        """
+        if util.PY2:
+            # Return the bitpattern as unsigned 32-bit number
+            return (~self._crc32 ^ 0xFFFFFFFF)
+        else:
+            return self._crc32
 
     def _get_digest_size(self, algo_name):
         if self._current_algo_name == algo_name: