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Signed-off-by: Casper Verbuyst <casperverbuyst@gmail.com>
Signed-off-by: Casper Verbuyst <casperverbuyst@gmail.com>
Signed-off-by: Casper Verbuyst <casperverbuyst@gmail.com>
NekoAsakura
requested changes
Oct 21, 2026
Co-authored-by: Neko Asakura <neko.asakura@outlook.com>
Signed-off-by: Casper Verbuyst <casperverbuyst@gmail.com>
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Writing
b'header'and then callingGzipFile.seek(16)can return6while the actual position is16. Code that uses the returned position to index records can therefore save incorrect offsets.Return the computed absolute target position without forcing another flush. Regression coverage checks absolute and relative seeks, small and large padding, a buffered write followed by
seek(0, SEEK_CUR), and decompressed contents.Validation: Windows x64 debug build of current main; test_gzip, test_zlib, and test_tarfile passed (960 cases reported, 23 skipped). Ruff 0.15.17 passed. The regression fails with the unchanged upstream gzip implementation and passes with the fix. The complete CPython suite and upstream CI have not been run.
Fixes #160071.