Re: UnZip 5.51c Beta available

Greg Roelofs <[email protected]> Thu, 15 May 2003 07:58:57 -0700
Newsgroups gmane.comp.archivers.info-zip
Message-ID <[email protected]>
> But, Greg, do you remember: There was a bug report some time ago
> concerning the unshrink code that failed to decompress a valid shrunk archiv
> entry.

Yes, that's been on my back-burner for a very long time.  (Getting pushed
farther and farther back, too. ;-) )

> This shrunk compressed entry can be extracted without problems when using PK
> tools, so there is a problem with our unshrink code. When this problem was
> submitted to Zip-Bugs, you said you might take a look into the decompression
> code when the patent situation "expires".

I'll see if I have time this summer.  The person who reported it also
supplied some un-LZW source code that could be adapted, if necessary.
It's just a matter of finding the time to do it.  (His code was C++ and
would need to be translated.)

> I had tried to understand why the unshrink process failed, but I was not
> familiar with LZW algorithm details and did not find any obvious bug.

There was another one a long time ago, and it was quite subtle.  So I'm
not surprised you couldn't find this one...

Regards,
  Greg