Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!sdd.hp.com!decwrl!sgi!zok!wattres!steve From: steve@wattres.UUCP (Steve Watt) Newsgroups: comp.dcom.modems Subject: Re: compressing a bit stream Keywords: data compression Message-ID: <592@wattres.UUCP> Date: 5 Aug 90 23:25:01 GMT References: <26B70D8E.23784@ics.uci.edu> <573@westmark.UU.NET> Reply-To: steve@wattres.UUCP (Steve Watt) Distribution: usa Organization: Steven Watt, Consultant Lines: 29 In article <573@westmark.UU.NET> dave@westmark.UU.NET (Dave Levenson) writes: >In article <26B70D8E.23784@ics.uci.edu>, roy@esp.ics.uci.edu (John Roy) writes: >> Before I go diving into the library, does anybody know of a >> good/simple data compression algorithm for a stream of random bits. I >I suggest that you have a look at the UNIX(tm) utility called compress. >It performs LZW encoding, and if you're at a UNIX site which runs Watch out if you plan on using this for ANY commercial application... There is a patent (number 4 558 302) held on the LZW algorithm by Unisys, and they are starting to realize what they have their hands on... There was a (brief) thread about this in comp.emacs. The article header is: From: rms@AI.MIT.EDU Newsgroups: comp.emacs Subject: compress patent Message-ID: <9008011947.AA22165@sugar-bombs.ai.mit.edu> Date: 1 Aug 90 19:47:31 GMT Lines: 101 [ <--- Too long for me to waste bandwidth. ] [ article body deleted, find it in your spool directory... ] -- Steve Watt ...!claris!wattres!steve wattres!steve@claris.com also works If you torture your data long enough, it'll eventually confess.