From owner-freebsd-hackers@FreeBSD.ORG  Tue Nov 25 21:05:32 2008
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 19648106568C
	for <freebsd-hackers@freebsd.org>; Tue, 25 Nov 2008 21:05:32 +0000 (UTC)
	(envelope-from joerg@britannica.bec.de)
Received: from www.sonnenberger.org (www.ostsee-abc.de [62.206.222.50])
	by mx1.freebsd.org (Postfix) with ESMTP id CE4178FC1B
	for <freebsd-hackers@freebsd.org>; Tue, 25 Nov 2008 21:05:28 +0000 (UTC)
	(envelope-from joerg@britannica.bec.de)
Received: from britannica.bec.de (www.sonnenberger.org [192.168.1.10])
	by www.sonnenberger.org (Postfix) with ESMTP id 6CDB9667C2
	for <freebsd-hackers@freebsd.org>; Tue, 25 Nov 2008 22:05:26 +0100 (CET)
Received: by britannica.bec.de (Postfix, from userid 1000)
	id 58AB28DC51; Tue, 25 Nov 2008 22:05:27 +0100 (CET)
Date: Tue, 25 Nov 2008 22:05:27 +0100
From: Joerg Sonnenberger <joerg@britannica.bec.de>
To: freebsd-hackers@freebsd.org
Message-ID: <20081125210526.GB9737@britannica.bec.de>
Mail-Followup-To: freebsd-hackers@freebsd.org
References: <917783.1650.qm@web39102.mail.mud.yahoo.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <917783.1650.qm@web39102.mail.mud.yahoo.com>
User-Agent: Mutt/1.5.18 (2008-05-17)
Subject: Re: lzma compression/decompression in bsdtar/libarchive?
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 25 Nov 2008 21:05:32 -0000

On Tue, Nov 25, 2008 at 10:56:24AM -0800, bf wrote:
> ??  Have you looked at this code?  Yes, there is: there is an "LZMA
> compressed file format" and the 7z file format, both of which support
> LZMA. The former format has been widely adopted by people who distribute
> lzma-compressed tarballs, especially GNU-related projects that use the
> lzmautils port.  Some projects, like GNU coreutils, no longer distribute
> the latest versions of their software in bzip2-compressed tarballs.

lzma files in the current form are a major PITA. The format doesn't have
a proper header and therefore is not really autodetectable.

Joerg