Changeset 7170

Timestamp:

Jun 10, 2009, 12:56:26 PM (14 years ago)

Author:

rwilson

Message:

Changed safe_crc() to use suggested method.

File:

• branches/numpy/anuga/utilities/system_tools.py (modified) (1 diff)

branches/numpy/anuga/utilities/system_tools.py

@@ -244 +244 @@
     """64 bit safe crc computation.
 
-       See Guido's 64 bit fix at http://bugs.python.org/issue1202            
+    See http://docs.python.org/library/zlib.html#zlib.crc32:
+
+        To generate the same numeric value across all Python versions 
+        and platforms use crc32(data) & 0xffffffff.
     """
 
     from zlib import crc32
-    import os
-
-    x = crc32(string)
-        
-    if os.name == 'posix' and os.uname()[4] in ['x86_64', 'ia64']:
-        crcval = x - ((x & 0x80000000) << 1)
-    else:
-        crcval = x
-        
-    return crcval
+
+    return crc32(string) & 0xffffffff