Re: Bug#160928: ITP: 7zip -- 7zip is file compressor which can handle many archive formats
On Wed, Sep 18, 2002 at 09:05:04AM -0300, Henrique de Moraes Holschuh wrote:
> On Wed, 18 Sep 2002, Hamish Moffatt wrote:
> > On Tue, Sep 17, 2002 at 12:54:53PM -0300, Henrique de Moraes Holschuh wrote:
> > > On Tue, 17 Sep 2002, Wichert Akkerman wrote:
> > > > RAR actually is a decent format.
> > >
> > > Not only it is a decend format, people who deal with audio (midi
> > > banks, midi files) are quite likely to use either it, or lha.
> >
> > Is this because they are frustated Amiga owners?
>
> Ask the .jp crew, I wouldn't know. All I know is that I have to keep unrar
> and lha around because of that.
I know unRAR source is available as free-bear context but it comes with strange
restrictions of "do not reverse engineer RAR using this code". To put it with
LGPL/GPL code needs some care, I think.
About LHA (LZH format), it is not DSFG free but it is almost PD
software. Several sources are available (DOS LHarc, DOS LHA, and Unix
LHA all similar copyrights and somewhat independent codes.)
It was defact standard in Japan and still is very popular in Japan
within DOS/Windows world.
It seems:
The deflation algorithm used by LHA seems to me another variation of LZ77
(Lempel-Ziv 1977) and Huffman tree combination as in gzip, zlib and zip.
*.LZH uses somewhat different file format from *.gz and *.ZIP. For example,
*.LZH contains 16 bit CRC while *.gz and *.ZIP contain 32 bit CRC.
It has supports of strange OS such as VAX, FLEX, HUMANOS, ... (What
are they?)
It uses 3 types of huffman compression and recent ones are static tree. ...
Cheers:-)
--
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Osamu Aoki @ Cupertino CA USA, GPG-key: A8061F32
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