From: news.uiowa.edu!icaen.uiowa.edu!mtpins@uunet.uu.net  (Michael T Pins)
Subject: Re: PKzip for apollo
Organization: University of Iowa, Iowa City, IA, USA
Distribution: fj
Date: Thu, 21 Jan 1993 03:53:20 GMT
Return-Path: <apollo-list-errors@srvr1.engin.umich.edu>

mmedina@halcon.dpi.udec.cl (Mario Medina C.) writes:

>Willem Jan Withagen (wjw@ebh.eb.ele.tue.nl) wrote:
->In article <1885@ddbeano.Dundee.NCR.COM> chris@ddbeano.Dundee.NCR.COM (Chris Ashmole) writes:
->=>
->=>	Can Anybody tell me where I can get a copy of PKzip or
->=>	equivalent to run under Domain O/S Rev SR 10.3.5
->=>	What I would like to be able to do is compress a file
->=>	on the Apollo, send it to a PC and then uncompress it.
->
->There is a public available version, to be compiled on Unix (ea.) boxes.
->Given the fact that we have it as unzip41.tar.Z would mean that it compiled 
->straight from the box.
->I think I saw version 5 somewhere. (On my OS/2 box??)
->
->Note that I've come across some files zipped with the apollo version, which
->didn't unzip on a PC. :-(
->

>	About pkzip on the apollo, you can't run either pkzip or any
>other pkware product on the apollo. These are copyrighted software, and
>there is no apollo version (neither is there a version for any other
>machine).
>	What is out there is a compatible archiver by a shareware
>company, info-zip. These guys make zip and unzip, and the archives they
>create are compatible with pkzip 1.1 for DOS, and implement the
>deflation method introduced by pkzip 1.93a for DOS. These are available
>in wuarchive.wustl.edu, in /usenet/comp.sources.misc/volume31/unzip50,
>and /usenet/comp.sources.misc/volume31/zip19, respectively.
>	They compile great under unix, and we use them currently in a
>DN10000.
>	Now for the bad news :
>	Unzip can dearchive files made by pkzip 1.1, but files
>compressed by zip cannot always be decompressed by pkunzip 1.1 for DOS,
>as unzip implements a more advanced algorithm. So, you can't always
>decompress in your PC what you compressed in your unix box.
>	There's a shareware version of info-zip's zip and unzip for Dos
>that are intended to replace pkzip's products, and work very well.
>	To further mess things up, pkware has just released pkzip
>v2.04c, which can decompress files made by info-zip's zip and pkzip
>v1.1, but rumor has it it's very buggy.
>	So, go figure!

My what a mess we have above....
Last September, Info-Zip released new versions of zip/unzip (1.9 and 5.0
respectfully) that were to be compatible with the new pkzip 2.xx that was
supposed to be released RSN.  Well, the new pkzip finally was released a few
weeks ago, and by all reports still has a number of annoying bugs.
Info-Zip's unzip5.0 will uncompress everything that the pkzip compresses, and
is fully backward compatible, so it's safe to install.
Info-Zip's zip1.9 compresses with the new pkzip format unavailable before
pkzip2.xx, so unless you have the latest (and still buggy) pkzip, don't use
zip1.9, use the previous version (who's number I don't recall offhand).
All of the above Info-Zip versions are available on grind.isca.uiowa.edu in the
unix/arc-progs area.

-- 
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* Michael Pins                |   Internet: amigapd@isca.uiowa.edu          *
* ISCA's Amiga Librarian      |         #include <std.disclaimer>           *
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