bug#258: [22.2]: visiting boost_1_35_0.tar.bz2 causes an error

[Eli Zaretskii <eliz@gnu.org>]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Tue, 20 May 2008 14:42:05 -0400
> Cc: 258@emacsbugs.donarmstrong.com, bug-gnu-emacs@gnu.org
> 
> > This report is going to be annoying, because
> > http://downloads.sourceforge.net/boost/boost_1_35_0.tar.bz2?modtime=1206
> > 795398&big_mirror=0 is a 22M file.  Sorry.  This also applies to 22.1.
> 
> > If I download the file, then visiting it under emacs -Q gives me:
> 
> > Debugger entered--Lisp error: (args-out-of-range -256589311 -256588799)
> 
> The problem appears to be that the file uses a format that tar-mode.el
> doesn't understand: the errors shows up with the first filename that is
> longer than 100 chars.
> It appears to be some GNU tar format whoe description I cannot
> find anywhere.  Basically, the block that is supposed to describe the
> file is replaced by a block that contains the complete filename (padded
> to 512 with \0 bytes) and is followed by the actual block:

It's the ustar format used by pax.  We've bumped into this before, I
think; search the archives.  (It's strange, though: I'm quite sure I
installed a stopgap fix in the last minute before v22.1 hit the FTP
sites, so maybe I'm confused and this is another problem?)