[Zope-CVS] CVS: Products/Ape/lib/apelib/zodb3 - storage.py:1.19

[Christian Zagrodnick]

Update of /cvs-repository/Products/Ape/lib/apelib/zodb3
In directory cvs.zope.org:/tmp/cvs-serv16672/lib/apelib/zodb3

Modified Files:
	storage.py 
Log Message:
added comments about 64-bit hashin


=== Products/Ape/lib/apelib/zodb3/storage.py 1.18 => 1.19 ===
--- Products/Ape/lib/apelib/zodb3/storage.py:1.18	Wed Oct 18 09:01:36 2006
+++ Products/Ape/lib/apelib/zodb3/storage.py	Wed Oct 18 09:27:15 2006
@@ -88,11 +88,15 @@
         """Returns an 8-byte hash value.
         """
         if v < -2L ** 32:
+            # This is a hash on a 64-bit machine. Treat as unsigned
+            # 64-bit integer
             v += 2L ** 64
         elif v < 0:
-            # Treat the hash as an unsigned 32-bit integer
+            # This is a hash on a 32-bit machine. Treat as an unsigned
+            # 32-bit integer
             v += 2L ** 32
         if v > 2L ** 32:
+            # This still is a hash on 64-bit machine. Compress to 32-bit.
             v = v / 2 ** 32
 
         assert v >= 0 and v <= 2L ** 32