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- Newsgroups: comp.compression
- Path: sparky!uunet!elroy.jpl.nasa.gov!ames!riacs!pan.arc.nasa.gov!roelofs
- From: roelofs@pan.arc.nasa.gov (Cave Newt)
- Subject: Re: Some minor problems with the new Info-ZIP
- Message-ID: <1992Sep9.190939.18913@riacs.edu>
- Sender: news@riacs.edu
- Organization: University of Chicago
- References: <bontchev.716054908@fbihh>
- Date: Wed, 9 Sep 92 19:09:39 GMT
- Lines: 68
-
- bontchev@fbihh.informatik.uni-hamburg.de writes:
-
- >1) There is some inconsistency in the file naming in the two archives.
- >The files in the unzip50.zip archive all have lowercase-only names,
- >while the files in zip19p1.zip have mixed-case names. It seems that
- >the two archives have been created by two different people. At first I
- >even thought that the first archive has been re-packaged under
- >MS-DOS... Would be nice if at least the text files that have one and
- >the same contents in the two archives have also one and the same name.
-
- Oh really? That's true; could be; and it would be. Which is to say:
- the files in unzip50.zip did not have lowercase-only names when they
- left *my* system. We *are* talking about sources, right? Anyway, yes,
- Zip and UnZip are maintained by two different people; we're slowly
- moving closer together in terms of making these a unified package,
- but it's hampered by the fact that UnZip is ancient history and has
- a lot of cruft in it. For all I know, the archive you found *was*
- re-packaged under DOS. Sorry, but that's not how it was released.
-
- >2) The file names in the Mac and VMS directories do not conform to the
- >ZipRules.
-
- Oh, well, as everybody knows, "do as I say, not as I do". :-) Which
- is to say: there are limits to what you can jam into an 8.3 format,
- and it's not reasonable to do so with Mac and VMS filenames, since
- they're not useful on 8.3 systems (i.e., MS-DOS), anyway. I apologize
- for the filename with two dots in it; that was an oversight (fatal in
- the case of SHEZ80, btw). To be fixed in the next release...
-
- Btw, if you use UnZip to extract, none of this matters, since it does
- a good job of mapping filenames for you. And the next version will
- have a -x option similar to Zip's (that is, you'll be able to exclude
- the VMS and Mac files via "unzip unzip51 *.[ch] -x VMS* Mac*").
-
- >3) The makefiles are also not consistent between the two archives. For
- >instance, one of the makefiles supports the "list" tag, while the
- >other doesn't.
-
- I'll let Jean-loup handle that one. :-)
-
- >4) What happened with the program ship? Why its disappearance is not
- >properly documented?
-
- Ship has nothing to do with zip and unzip, aside from being a convenient
- way to mail zipfiles to and from the authors. It was included as "extra
- baggage" for two releases, but it was never fully documented (i.e., no
- man page) and nobody ever claimed it would stick around. The old version
- still works; a new version will be distributed separately, "sometime soon"
- (I'll let Mark make that more precise; he's been on vacation).
-
- >A version that would support
- >different encoding schemes (e.g., xxencode) would be nice...
-
- Now *there's* an interesting idea. That should be a fairly simple
- extension to the format, too. Mark, what do you think?
-
- >5) The most important of all. Can I create archives that are
- >compatible with PKZIP 1.10 or with the old zip? I.e., is there an
- >option to disable the deflation method?
-
- No. Zip 1.0 (and now 1.1--just a couple of bugfixes) are still available;
- use them in the interim, but don't expect them to be updated any further.
- I agree that it would be convenient to have the old compression methods
- supported, but it adds a lot of complexity and bulk to the code. Just the
- sources for Zip and UnZip are now running well over a megabyte.
-
- Greg Roelofs
- Info-ZIP UnZip guy
-