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https://issues.apache.org/jira/browse/COMPRESS-54?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12689465#action_12689465
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Torsten Curdt commented on COMPRESS-54:
---------------------------------------

I've only gathered libraries for implementing this.

For RAR I found sources for
o rarlib (GPL)
o unrar (sort of free but cpp)

For 7zip I found
o p7zip (LGPL + restriction, written in C)
o j7zip (LGPL)

And there are other algorithms (and libraries) to implement as well: ARJ, CAB, 
...

But I fear some of those implementations need to be hosted somewhere else (due 
to the licensing). I'd suggest to create a github project for it.

> Add 7zip or RAR archive support
> -------------------------------
>
>                 Key: COMPRESS-54
>                 URL: https://issues.apache.org/jira/browse/COMPRESS-54
>             Project: Commons Compress
>          Issue Type: New Feature
>         Environment: N/A
>            Reporter: Tim Pinet
>            Priority: Minor
>   Original Estimate: 30h
>  Remaining Estimate: 30h
>
> Has anyone looked into adding support for 7zip and RAR file types? Using the 
> j7zip and junrar libraries I was able to get a rough protoype working with 
> commons-compress but only with extract support for RAR (due to licencing 
> issues). Also, my prototype performance is poor so I definately need to 
> improve it.

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