Xref: news2.mv.net comp.os.msdos.djgpp:6849 From: John Joseph Newbigin <079519 AT bud DOT cc DOT swin DOT edu DOT au> Newsgroups: comp.os.msdos.djgpp Subject: Re: MSDOS Unzip Program Date: Mon, 5 Aug 1996 13:41:57 +1000 Organization: Swinburne University of Technology Lines: 30 Message-ID: References: <4tgq4k$bt0 AT news DOT uni-paderborn DOT de> <31FAD0AE DOT 503 AT ix DOT netcom DOT com> <4tisnv$139h AT rs18 DOT hrz DOT th-darmstadt DOT de> NNTP-Posting-Host: bude.cc.swin.edu.au Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <4tisnv$139h@rs18.hrz.th-darmstadt.de> To: djgpp AT delorie DOT com DJ-Gateway: from newsgroup comp.os.msdos.djgpp On 29 Jul 1996, Alexander Lehmann wrote: > iNFiK wrote: > > : thoes freeware ZIPers are based on the original pkware PKZIP program. > : and pkzip is freeware unless you use it in a buisness or somthin =-] .. i > : think.... > > Actually, PKZIP is based on LHA 2.x, much more than zip is based on > PKZIP. When LHA 2.x was released (which was basically a quantum leap > in compression), pkzip got a new compression method which about > equaled LHA, and since the source code of LHA was available, I would > guess that the author at least was inspired by it (which is ok, since > Yoshi released LHA a public domain). > > The unzip program, which was the base for free zip/unzip was > programmed without any information about the format itself (at least > that's what I have heared), they basically reinvented the algorithm > based on the knowledge of LHA. Now, while the file format is certainly > an invention of PKWARE, the zip program has added long file names, > upper/lower case and symbolic links (for unix). > > Has this __anything__ to do with DJGPP? Newbs.