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https://issues.apache.org/jira/browse/TIKA-953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13487957#comment-13487957
 ] 

Nick Burch commented on TIKA-953:
---------------------------------

File isn't getting this on the regular magic, it's only found via a special 
helper in is_tar.c

I'm not sure if we can represent that same logic in our mime magic structure, 
as from first glance it's doing a load of checksum related stuff, but if 
someone wants to investigate that's probably the best place to start!
                
> Tika failed to recognize non-ustar Tar  file?
> ---------------------------------------------
>
>                 Key: TIKA-953
>                 URL: https://issues.apache.org/jira/browse/TIKA-953
>             Project: Tika
>          Issue Type: Bug
>          Components: mime
>    Affects Versions: 1.1
>            Reporter: Jing Li
>             Fix For: 1.2
>
>         Attachments: test2.tar, test.tar
>
>
> The file type indeed is "POSIX tar archive (GNU)" when I use command "file" 
> in linux, but Tika recognize it as "application/xhtml+xml".  The class I used 
> with is DefaultDetector. 
> Below is the head data of the file:
> 99, 102, 101, 114, 98, 114, 97, 99, 104, 101, 46, 48, 48, 54, 55, 54, 50, 55, 
> 57, 45, 53, 54, 54, 55, 50, 52, 47, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
> 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
> 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
> 0, 0, 0, 0, 0, 0, 0, 48, 48, 48, 48, 55, 48, 48, 0, 48, 48, 48, 48, 48, 48, 
> 48, 0, 48, 48, 48, 48, 48, 48, 48, 0, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 
> 48, 0, 49, 49, 55, 55, 55, 49, 49, 52, 50, 48, 53, 0, 48, 49, 51, 51, 51, 49, 
> 0, 32, 53, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
> 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
> 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
> 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
> 117, 115, 116, 97, 114, 32, 32, 0, 114, 111, 111, 116, 0, 0, 0, 0, 0, 0, 0, 
> 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 114, 111, 111, 
> 116, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
> 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
> 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
> 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
> 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
> 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
> 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
> 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,... 

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