Force zlib.crc32 and zlib.adler32 to return a signed integer on all platforms

regardless of the native sizeof(long) used in the integer object.

This somewhat odd behavior of returning a signed is maintained in 2.x for
compatibility reasons of always returning an integer rather than a long object.

Fixes Issue1202 for Python 2.6

1 files changed, 12 insertions, 0 deletions

diff --git a/Doc/library/zlib.rst b/Doc/library/zlib.rst
index 94e429e..b522fe6 100644
--- a/Doc/library/zlib.rst
+++ b/Doc/library/zlib.rst
@@ -42,6 +42,12 @@ The available exception and functions in this module are:
    the algorithm is designed for use as a checksum algorithm, it is not suitable
    for use as a general hash algorithm.
 
+   This function always returns an integer object.
+
+.. versionchanged:: 2.6
+   For consistent cross-platform behavior we always return a signed integer.
+   ie: Results in the (2**31)...(2**32-1) range will be negative.
+
 
 .. function:: compress(string[, level])
 
@@ -74,6 +80,12 @@ The available exception and functions in this module are:
    the algorithm is designed for use as a checksum algorithm, it is not suitable
    for use as a general hash algorithm.
 
+   This function always returns an integer object.
+
+.. versionchanged:: 2.6
+   For consistent cross-platform behavior we always return a signed integer.
+   ie: Results in the (2**31)...(2**32-1) range will be negative.
+
 
 .. function:: decompress(string[, wbits[, bufsize]])