[Bug #1083110] calling .flush() on decompress objects causes a segfault due to an uninitialized pointer: fixes the problem and adds a test case
diff --git a/Lib/test/test_zlib.py b/Lib/test/test_zlib.py
index 8683879..b4bf77e 100644
--- a/Lib/test/test_zlib.py
+++ b/Lib/test/test_zlib.py
@@ -290,6 +290,16 @@
# if decompressed data is different from the input data, choke.
self.assertEqual(expanded, data, "17K random source doesn't match")
+ def test_empty_flush(self):
+ # Test that calling .flush() on unused objects works.
+ # (Bug #1083110 -- calling .flush() on decompress objects
+ # caused a core dump.)
+
+ co = zlib.compressobj(zlib.Z_BEST_COMPRESSION)
+ self.failUnless(co.flush()) # Returns a zlib header
+ dco = zlib.decompressobj()
+ self.assertEqual(dco.flush(), "") # Returns nothing
+
def genblock(seed, length, step=1024, generator=random):
"""length-byte stream of random data from a seed (in step-byte blocks)."""