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Re: new snapshot (rm fixes and new program: mktemp)


From: Lasse Collin
Subject: Re: new snapshot (rm fixes and new program: mktemp)
Date: Tue, 9 Oct 2007 17:55:33 +0300
User-agent: KMail/1.9.6

Jim Meyering wrote:
> Bauke Jan Douma <address@hidden> wrote:
> > Never heard of it!
> > Is this it: http://tukaani.org/lzma/ ?
>
> Yes.
>
> > Is it considered mature/stable??

The compression code is stable (it's from stable LZMA SDK).

"Beta" refers mostly to the command line tool. It never got all the 
features that were planned, because development switched to a new 
branch, which has been under development over a year now. As a result, 
the old 4.32.0betas branch were left to be called betas.

The alpha versions have nothing stable, not even the core of the 
compression code. Don't trust them. They are there only for testing.

The 4.32.0betas have been used by a few (small) GNU+Linux distros as 
part of the package management (all packages compressed with LZMA). 
LZMA has worked reliably in all situations that I'm aware. The command 
line tool has had some minor bugs (no data corruption bugs) but those 
have been fixed.

The biggest problem is that the current .lzma format doesn't have any 
integrity check. If a few bits flip in the compressed file, it may go 
undetected especially if the flipped bits are near the end of the file. 
This will be fixed in the new .lzma format, but there are no stable 
tools to handle that format yet.

-- 
Lasse Collin  |  IRC: Larhzu @ IRCnet & Freenode




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