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[ILUG] A sysadmin dream come true !

[ILUG] A sysadmin dream come true !

Joe jos at dublin.com
Mon Jan 14 12:32:05 GMT 2002


That's nothing - look at lzip (lossy zip):
http://lzip.sourceforge.net
Reduces all files down to 10% or even 0% of their original size!
 From the FAQ:
======================
     It utilizes a two-pass bit-sieve to first remove all unimportant data 
from the data set. Lzip implements this quiet effectively by eliminating all 
of the 0's.  It then sorts the remaining bits into increasing order, and 
begins searching for patterns. The number of passes in this search is set to 
(10-N) in lzip, where N is the numeric command-line argument we've been 
telling you about. 
     For every pattern of length (10/N) found in the data set, the algorithm 
makes a mark in its hash table. By keeping the hash table small, we can 
reduce memory overhead. Lzip uses a two-entry hash table. Then data in this 
table is then plotted in three dimensions, and a discrete cosine transform 
transforms it into frequency and amplitude data. This data is filtered for 
sounds that are beyond the range of the human ear, and the result is 
transformed back (via an indiscrete cosine) into the hash table, in random 
order. 
     Take each pattern in the original data set, XOR it with the log of it's 
entry in the new hash table, then shuffle each byte two positions to the left 
and you're done! 
     And you can see, there is some very advanced thinking going on here. It 
is no wonder this algorithm took so long to develop! 
================================
> On Mon, 14 Jan 2002, Stephane Dudzinski wrote:
> Wow! Infinite compressions and backups on a floppy, what a great new
> company !
>
> http://www.zeosync.com/flash/pressrelease.htm
>




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