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bpo-39389: gzip: fix compression level metadata - #18077
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As described in RFC 1952, section 2.3.1, the XFL (eXtra FLags) byte of a gzip member header should indicate whether the DEFLATE algorithm was tuned for speed or compression ratio. Prior to this patch, archives emitted by the `gzip` module always indicated maximum compression. Test Plan: Unit tests added; they fail before this patch (in 2 of 3 cases) and pass after it. wchargin-branch: gzip-compresslevel-metadata
wchargin-branch: gzip-compresslevel-metadata
serhiy-storchaka
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Thanks @wchargin for the PR, and @serhiy-storchaka for merging it 🌮🎉.. I'm working now to backport this PR to: 3.7, 3.8. |
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As described in RFC 1952, section 2.3.1, the XFL (eXtra FLags) byte of a gzip member header should indicate whether the DEFLATE algorithm was tuned for speed or compression ratio. Prior to this patch, archives emitted by the `gzip` module always indicated maximum compression. (cherry picked from commit eab3b3f) Co-authored-by: William Chargin <wchargin@gmail.com>
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GH-18100 is a backport of this pull request to the 3.8 branch. |
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As described in RFC 1952, section 2.3.1, the XFL (eXtra FLags) byte of a gzip member header should indicate whether the DEFLATE algorithm was tuned for speed or compression ratio. Prior to this patch, archives emitted by the `gzip` module always indicated maximum compression. (cherry picked from commit eab3b3f) Co-authored-by: William Chargin <wchargin@gmail.com>
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GH-18101 is a backport of this pull request to the 3.7 branch. |
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As described in RFC 1952, section 2.3.1, the XFL (eXtra FLags) byte of a gzip member header should indicate whether the DEFLATE algorithm was tuned for speed or compression ratio. Prior to this patch, archives emitted by the `gzip` module always indicated maximum compression. (cherry picked from commit eab3b3f) Co-authored-by: William Chargin <wchargin@gmail.com>
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@serhiy-storchaka: Great; thank you for the review! |
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shihai1991
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As described in RFC 1952, section 2.3.1, the XFL (eXtra FLags) byte of a gzip member header should indicate whether the DEFLATE algorithm was tuned for speed or compression ratio. Prior to this patch, archives emitted by the `gzip` module always indicated maximum compression.
ned-deily
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…18101) * bpo-39389: gzip: fix compression level metadata (GH-18077) As described in RFC 1952, section 2.3.1, the XFL (eXtra FLags) byte of a gzip member header should indicate whether the DEFLATE algorithm was tuned for speed or compression ratio. Prior to this patch, archives emitted by the `gzip` module always indicated maximum compression. (cherry picked from commit eab3b3f) Co-authored-by: William Chargin <wchargin@gmail.com>
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This change implements a fix to compression in gzip tool that CPython applied per https://bugs.python.org/issue39389. It uses proper XFL value in gzip header per https://tools.ietf.org/html/rfc1952, section 2.3.1. Refs: * python/cpython#18077 (CPython 3.9.0+) * python/cpython#18100 (CPython 3.8.2+) * python/cpython#18101 (CPython 3.7.7+) Fixes #1849
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This change implements a fix to compression in gzip tool that CPython applied per https://bugs.python.org/issue39389. It uses proper XFL value in gzip header per https://tools.ietf.org/html/rfc1952, section 2.3.1. Refs: * python/cpython#18077 (CPython 3.9.0+) * python/cpython#18100 (CPython 3.8.2+) * python/cpython#18101 (CPython 3.7.7+) Fixes #1849 (cherry picked from commit 3925ae9)
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As described in RFC 1952, section 2.3.1, the XFL (eXtra FLags) byte of a
gzip member header should indicate whether the DEFLATE algorithm was
tuned for speed or compression ratio. Prior to this patch, archives
emitted by the gzip module always indicated maximum compression.
Test Plan:
Unit tests added; they fail before this patch (in 2 of 3 cases) and pass
after it.
wchargin-branch: gzip-compresslevel-metadata
https://bugs.python.org/issue39389