gh-108111: Flush gzip write buffer before seeking, fixing bad writes#108341
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encukou approved these changes Aug 23, 2023
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miss-islington commented Aug 24, 2023
bedevere-bot commented Aug 24, 2023
GH-108402 is a backport of this pull request to the 3.12 branch. |
miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Aug 24, 2023
…rites (pythonGH-108341) (cherry picked from commit 2eb60c1) Co-authored-by: Chris Markiewicz <effigies@gmail.com> Co-authored-by: Łukasz Langa <lukasz@langa.pl>
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Issue described in detail in #108111.
Short story:
write(x); seek(len(x)); write(x)results inb''.join([x, bytes(len(x)), x])being written. This is due to buffered writes not updating theGzipFile.offset()until flushed. It's possible there could be something more efficient, but this seemed like the simplest solution.