mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-08-04 08:59:19 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 11

gh-108111: Flush gzip write buffer before seeking, fixing bad writes (#108341)

Browse source 
Co-authored-by: Łukasz Langa <lukasz@langa.pl>
This commit is contained in:
Chris Markiewicz 2023-08-24 04:23:01 -04:00 • committed by GitHub
parent aa9a359ca2
commit 2eb60c1934
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
4 changed files with 18 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

12
Lib/test/test_gzip.py
View file

@ -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):