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Issue #16350: Fix zlib decompressor handling of unused_data with multiple calls to decompress() after EOF.

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Patch by Serhiy Storchaka.
This commit is contained in:
Nadeem Vawda 2012-11-05 00:37:42 +01:00
parent 6c5f5210be
commit 39079946a2
3 changed files with 40 additions and 6 deletions
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13
Lib/test/test_zlib.py
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@ -434,6 +434,19 @@ class CompressObjectTestCase(BaseCompressTestCase, unittest.TestCase):
y += dco.flush()
self.assertEqual(y, b'foo')
def test_decompress_unused_data(self):
# Repeated calls to decompress() after EOF should accumulate data in
# dco.unused_data, instead of just storing the arg to the last call.
x = zlib.compress(HAMLET_SCENE) + HAMLET_SCENE
for step in 1, 2, 100:
dco = zlib.decompressobj()
data = b''.join(dco.decompress(x[i : i + step])
for i in range(0, len(x), step))
data += dco.flush()
self.assertEqual(data, HAMLET_SCENE)
self.assertEqual(dco.unused_data, HAMLET_SCENE)
if hasattr(zlib.compressobj(), "copy"):
def test_compresscopy(self):
# Test copying a compression object