Re: [cc65] Compression (was: Atmos (was: Regbank))

Date view Thread view Subject view

From: Ullrich von Bassewitz (uz_at_musoftware.de)
Date: 2003-01-05 22:32:07 

Hi!

On Sun, Jan 05, 2003 at 10:25:27PM +0100, Ullrich von Bassewitz wrote:
> From the comments it seems to be LZ77. I'm no compression specialist, but
> wasn't this the (patented) compression algorithm used in the old compress
> program and GIF images? If so, INFLATE/DEFLATE should work better for most
> input files. However, the zlib unpacker seems to be larger than the LZ77 one
> written by Jede.

This seems to be wrong. What I found on 

    http://www.chemie.fu-berlin.de/chemnet/general/topics/packfmt.html

is that the old Unix compress utility uses LZW, while gzip uses LZ77. This
leads to the question, how the code from Jede differs from the existing zlib
code. Maybe the zlib INFLATE/DEFLATE algorithm is different from LZ77?

Regards


        Uz


-- 
Ullrich von Bassewitz                                  uz_at_musoftware.de
----------------------------------------------------------------------
To unsubscribe from the list send mail to majordomo_at_musoftware.de with
the string "unsubscribe cc65" in the body(!) of the mail.

Date view Thread view Subject view

This archive was generated by hypermail 2.1.3 : 2003-01-05 22:32:13 CET