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From Stefan Bodewig <>
Subject Re: [compress] State of encoding support in ZIP package
Date Mon, 02 Mar 2009 15:13:45 GMT
On 2009-03-01, Wolfgang Glas <> wrote:

> My understanding from previous discussion was, that we need a mode,
> where file names not encodable by the chosen encoding are encoded in
> UTF-8, which is in turn indicated by setting the EFS flag on the
> likewise ZIP entry. (That's the way 7-zip handles unicode
> filenames...)

This is different from what we've currently implemented, but may stiil
be useful.

> The current implementation of the useEFS flag simply allocs to
> disable the creation of the UFS flag in ZIP entries, which are
> UTF-8. This approach is not conformant with the specifiations I've
> read and I have not seen a single zip implementation, which is
> disturbed by the EFS flag.

But if there should be one - say zlib on z/OS or some other strange
thing, it will be good to have that option available,

> My opinion would be to simply drop the possibility to inhibit the
> EFS flag in utf-8 encoded files and to introduce a new flag allowing
> to switch to utf-8 fallbacks (7-zip mode...).

I'm fine with an additional flag that would encode not-encodable file
names as UTF-8 (not sure about the name of the flag and I have a long
standing history for chosing bad names), but prefer to keep the
existing option for the completely orthogonal case of whether we set
the EFS at all.


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