bsdtar can't handle files >8GB

[Tim Kientzle]

Josh Carroll wrote:
>>tar: Unrecognized archive format: Inappropriate file type or format
>>tar: Error exit delayed from previous errors.
> 
> Confirmed in RELENG_7 as well. Interestingly enough, if the file
> inside the tarball is nothing but zeros (dd if=/dev/zero ...), I don't
> get this error.  However, it doesn't work either. The resulting file
> is 0 bytes, rather than 10 GB of \0.

Try the attached patch, which I think fixes this
problem.

I need to do some more testing before I commit it,
but your feedback will certainly help.  The failure
here is that libarchive was erroneously interpreting
the large file as having a zero-byte body, then generating
the error above when it tried to read the next header.

This bug crept in when I was working on read support
for GNU tar's new --pax --sparse format.  I need to
test that in the case where a sparse entry has more than
8G of non-hole data.

Tim Kientzle
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