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-
- Who is Info-Zip?
-
-
- They are a dedicated group of people who have developed a
- freeware implementation of ZIP and UNZIP. Their code originated
- on Unix, but now exists on a multitude of platforms!
-
- They formed shortly after the famous SEA vs. Phil Katz lawsuit
- around 1990. This was when Thom Henderson of System Enhancement
- Associates (author of the then-popular ARC program) sued Phil Katz
- for making a compatible set of programs (PKARC and PKXARC) that
- were far better than the original. The majority of programmers
- supported Phil because he didn't steal or borrow any of SEA's code.
- His only sin was using the same file format developed by SEA, and
- using the 3 letters: ARC.
-
- Following the lawsuit, which Phil lost, sadly, he renamed his
- programs (PKARC became PKPAK, PKXARC became PKUNPAK), and developed
- a new and improved compression program called PKZIP. The rest is
- history. Phil released the file format into the public domain so
- others could write compatible programs (he didn't want anyone else
- burned over such a ridiculous issue).
-
- The Info-Zip group of programmers got started when they couldn't
- find a Unix program to handle the ZIP format. Their efforts were
- slow to get going, but they became known for their high quality
- freeware C source code. Today, their code is more compatible with
- Windows 95 and NT than any of the programmer libraries released by
- Phil Katz to date.
-
- This is where I come in - Phil's own commercially offered Delphi
- File Compression library was very limited (at least in the Dec 96
- timeframe when I started by port). It did not come with source code,
- did not support deflation (the best compression method), and worst
- of all, it didn't even support the standard PKZIP file format!
-
- Since I knew of Info-Zip, I decided to see if I could port their
- C source code to work as a Win32 DLL. This allows Delphi programmers
- to benefit from the mega-manhours spent on the Info-Zip project. My
- efforts are NOT an official part of the Info-Zip project, since I
- have not "carried over" all of the platform independant code.
-
-
- Info-Zip home page:
- http://www.cdrom.com/pub/infozip/
-
-
- Eric W. Engler
- March 1997
-