cz at gocept
Oct 18, 2006, 6:01 AM
Post #1 of 1
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CVS: Products/Ape/lib/apelib/zodb3 - storage.py:1.18
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Update of /cvs-repository/Products/Ape/lib/apelib/zodb3
In directory cvs.zope.org:/tmp/cvs-serv6816
Modified Files:
storage.py
Log Message:
fixed the hash64 function for 64 bit machines
the hash64 maps all hash result into an unsigned 32-bit integer which did break on 64bit machines because the python hash has doubled in size.
=== Products/Ape/lib/apelib/zodb3/storage.py 1.17 => 1.18 ===
--- Products/Ape/lib/apelib/zodb3/storage.py:1.17 Wed Jan 12 01:53:42 2005
+++ Products/Ape/lib/apelib/zodb3/storage.py Wed Oct 18 09:01:36 2006
@@ -87,10 +87,16 @@
def hash64(self, value):
"""Returns an 8-byte hash value.
"""
- v = hash(value)
- if v < 0:
+ if v < -2L ** 32:
+ v += 2L ** 64
+ elif v < 0:
# Treat the hash as an unsigned 32-bit integer
v += 2L ** 32
+ if v > 2L ** 32:
+ v = v / 2 ** 32
+
+ assert v >= 0 and v <= 2L ** 32
+
h = '%08x' % v
if h == HASH0:
# Avoid the special zero hash.
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