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[3.12] gh-108111: Flush gzip write buffer before seeking, fixing bad writes (GH-108341) (#108402)

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gh-108111: Flush gzip write buffer before seeking, fixing bad writes (GH-108341)
(cherry picked from commit 2eb60c1934)

Co-authored-by: Chris Markiewicz <effigies@gmail.com>
Co-authored-by: Łukasz Langa <lukasz@langa.pl>
This commit is contained in:
Miss Islington (bot) 2023-08-24 03:30:16 -07:00 • committed by GitHub
parent 459f24aef0
commit 20357ed2a4
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4 changed files with 18 additions and 0 deletions
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12
Lib/test/test_gzip.py
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@ -665,6 +665,18 @@ class TestGzip(BaseTest):
]
self.assertEqual(fc.modes, expected_modes)
def test_write_seek_write(self):
# Make sure that offset is up-to-date before seeking
# See issue GH-108111
b = io.BytesIO()
message = b"important message here."
with gzip.GzipFile(fileobj=b, mode='w') as f:
f.write(message)
f.seek(len(message))
f.write(message)
data = b.getvalue()
self.assertEqual(gzip.decompress(data), message * 2)
class TestOpen(BaseTest):
def test_binary_modes(self):