On Tue, Jun 2, 2026 at 8:07 AM Curtis Matz via Freedos-devel
<[email protected]> wrote:
>
> I’m having an issue with zip and getting the error below any ideas?
>
> C:\>zip -r user.zip c:\user
[..]
> C:\>zip -T user.zip
> zip warning: missing end signature--probably not a zip file (did you
> zip warning: remember to use binary mode when you transferred it?)
> zip warning: (if you are trying to read a damaged archive try -F)
>
> zip error: Zip file structure invalid (user.zip)
This zip exe is from the Info-Zip folks, so this is a problem with the
binary they provided. I just tested it and I get the same issue. But
the zip files are otherwise valid (i.e. the data is there and can be
extracted) but the zip archive is reported as damaged.
Even more interesting is that using zip -F or -FF to fix it doesn't
actually repair the problem. (zip -T still reports an issue.)
I think this is an issue with "zip -T" for that exe. Here's a second test I did:
On FreeDOS, zip some files from a directory, and test the zip file:
D:\SRC> zip -r A:m.zip PROJ
D:\SRC> zip -T A:m.zip
zip warning: missing end signature--probably not a zip file (did you
zip warning: remember to use binary mode when you transferred it?)
zip warning: (if you are trying to read a damaged archive try -F)
zip error: Zip file structure invalid (A:m.zip)
On Linux, mount the floppy and test the zip file again:
$ zip -T floppy/M.ZIP
test of floppy/M.ZIP OK
So while I don't like that zip -T is reporting a problem, the zip file
itself seems to be fine when examined elsewhere. (The zip exe should
be fixed.)
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