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bpo-39389: gzip: fix compression level metadata (GH-18077)
authorMiss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Tue, 21 Jan 2020 11:42:49 +0000 (03:42 -0800)
committerGitHub <noreply@github.com>
Tue, 21 Jan 2020 11:42:49 +0000 (03:42 -0800)
commitab0d8e356ecd351d55f89519a6a97a1e69c0dfab
tree96ebcbddf3f2738c89b56f24d04c40e7b71e0de3tree | snapshot
parent060ad2fc1535adc76f96be8269b4af0f14429161commit | diff
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 eab3b3f1c60afecfb4db3c3619109684cb04bd60)

Co-authored-by: William Chargin <wchargin@gmail.com>
Lib/gzip.py diff | blob | blame | history
Lib/test/test_gzip.py diff | blob | blame | history
Misc/NEWS.d/next/Library/2020-01-20-00-56-01.bpo-39389.fEirIS.rst [new file with mode: 0644] blob
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