Hi Steffen,
> > The closest is
> > http://www.iana.org/assignments/media-types/application/gzip which
> > leaves the tar for the user to fathom out if left to MIME types
> > alone.
>
> [http://svn.apache.org/viewvc/tika/trunk/tika-core/src/main/resources/org/apache/tika/mime/tika-mimetypes.xml]
> lists the extension tgz regulary thereunder
>
> <mime-type type="application/gzip">
> <_comment>Gzip Compressed Archive</_comment>
> <alias type="application/x-gzip"/>
> <alias type="application/x-gunzip"/>
> <alias type="application/gzip-compressed"/>
> <alias type="application/gzipped"/>
> <alias type="application/gzip-compressed"/>
> <alias type="application/x-gzip-compressed"/>
> <alias type="gzip/document"/>
> <magic priority="45">
> <match value="\037\213" type="string" offset="0" />
> <match value="\x1f\x8b" type="string" offset="0" />
> </magic>
> <glob pattern="*.tgz" />
> <glob pattern="*.gz" />
> <glob pattern="*-gz" />
> <glob pattern="*.emz" />
> </mime-type>
Interesting, but the comment seems wrong, since foo.gz need not be an
archive, i.e. a collection of other things, and it's lumping foo.gz and
foo.tgz together, so no indication that one of them is a tar file.
MIME types just don't seem to allow layering. That file also has a
couple of tar types.
<mime-type type="application/x-tar">
<magic priority="40">
<!-- POSIX tar archive -->
<match value="ustar\0" type="string" offset="257" />
</magic>
<glob pattern="*.tar"/>
</mime-type>
<mime-type type="application/x-gtar">
<_comment>GNU tar Compressed File Archive (GNU Tape Archive)</_comment>
<magic priority="50">
<!-- GNU tar archive -->
<match value="ustar \0" type="string" offset="257" />
</magic>
<glob pattern="*.gtar"/>
<sub-class-of type="application/x-tar"/>
</mime-type>
The second's comment suggests it's compressed but then it wants `ustar'
at offset 257 which is uncompressed.
It's a mess. HTTP can ship an application/x-tar with a Content-Encoding
of gzip, but that's not the same thing as the client should ungzip to
deliver the tar; not what's wanted.
This seems to be getting off-groff topic. :-)
Cheers, Ralph.
