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zlib.crc32 and zlib.adler32 now return an unsigned value as any sane person

Browse source 
would expect.

Fixes issues1202.
This commit is contained in:
Gregory P. Smith 2008-03-17 20:24:09 +00:00
parent c55485bc6d
commit ab0d8a1f59
3 changed files with 14 additions and 2 deletions
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4
Doc/library/zlib.rst
View file

@ -42,6 +42,8 @@ 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.
Always returns an unsigned 32-bit integer.
.. function:: compress(string[, level])
@ -74,6 +76,8 @@ 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.
Always returns an unsigned 32-bit integer.
.. function:: decompress(string[, wbits[, bufsize]])

8
Lib/test/test_zlib.py
View file

@ -38,6 +38,14 @@ def test_penguins(self):
self.assertEqual(zlib.crc32(b"penguin"), zlib.crc32(b"penguin", 0))
self.assertEqual(zlib.adler32(b"penguin"),zlib.adler32(b"penguin",1))
def test_crc32_adler32_unsigned(self):
foo = 'abcdefghijklmnop'
# explicitly test signed behavior
self.assertEqual(zlib.crc32(foo), 2486878355)
self.assertEqual(zlib.crc32('spam'), 1138425661)
self.assertEqual(zlib.adler32(foo+foo), 3573550353)
self.assertEqual(zlib.adler32('spam'), 72286642)
class ExceptionTestCase(unittest.TestCase):

4
Modules/zlibmodule.c
View file

@ -922,7 +922,7 @@ PyZlib_adler32(PyObject *self, PyObject *args)
if (!PyArg_ParseTuple(args, "s#|k:adler32", &buf, &len, &adler32val))
return NULL;
adler32val = adler32(adler32val, buf, len);
return PyLong_FromLong(adler32val);
return PyLong_FromUnsignedLong(adler32val & 0xffffffff);
}
PyDoc_STRVAR(crc32__doc__,
@ -940,7 +940,7 @@ PyZlib_crc32(PyObject *self, PyObject *args)
if (!PyArg_ParseTuple(args, "s#|k:crc32", &buf, &len, &crc32val))
return NULL;
crc32val = crc32(crc32val, buf, len);
return PyLong_FromLong(crc32val);
return PyLong_FromUnsignedLong(crc32val & 0xffffffff);
}