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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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Lib/gzip.py
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@ -401,6 +401,9 @@ class GzipFile(_compression.BaseStream):
def seek(self, offset, whence=io.SEEK_SET):
if self.mode == WRITE:
self._check_not_closed()
# Flush buffer to ensure validity of self.offset
self._buffer.flush()
if whence != io.SEEK_SET:
if whence == io.SEEK_CUR:
offset = self.offset + offset