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https://issues.apache.org/jira/browse/COMPRESS-272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13967500#comment-13967500
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Stefan Bodewig commented on COMPRESS-272:
-----------------------------------------
For 1.7 and 1.8 this is a documentation bug that I intend to rectify soon, for
1.9 we'll implement auto-detection.
> CompressorStreamFactory fails to autodetect files using Unix compress (.Z
> files)
> --------------------------------------------------------------------------------
>
> Key: COMPRESS-272
> URL: https://issues.apache.org/jira/browse/COMPRESS-272
> Project: Commons Compress
> Issue Type: Bug
> Components: Compressors
> Affects Versions: 1.7
> Reporter: Paul Blizniak
> Fix For: 1.9
>
>
> I use the factory classes quite extensively to guess the correct
> implementation of a file that needs to be unpacked. The current doc does
> list that for lzma and 7zip files, the auto detect will not work. I have
> worked around this by looking at the file extension, and hope that its
> correct.
> For .Z files, I can only uncompress the file if I explicitly tell the factory
> that its using .Z compression, the auto detect never works. I'm using 1.7,
> but I dont think its fixed in 1.8 either (after looking at the bug fix list).
> Either its a bug in the doc, or in the auto detect of the compressor factory.
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