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Re: [PATCH] Unzip fails without optional extended local header signature

From: Michael Gray
Subject: Re: [PATCH] Unzip fails without optional extended local header signature
Date: Wed, 30 Nov 2011 12:28:03 -0800

On Wed, Nov 30, 2011 at 1:57 AM, Jim Meyering <address@hidden> wrote:
> Thank you for the analysis and patch.
> However, I haven't looked at it yet, in case I have to
> rewrite it based solely on your description.
> Can you point to tools that produce ZIP files without that signature?

The tool I was using was "pigz" by Mark Adler, a parallel
implementation of gzip. When I contacted Mark Adler about it, he
indicated that emitting the signature would break older decoders,
whereas omitting the signature would guarantee compatibility with both
new and old. Thus he was more comfortable omitting the signature. The
last release of pigz was in Jan 2010, so it's not too old. I just
emailed Mark again, inquiring if he knows of any other software that
makes this choice.

> Assuming that we find a few that are still in non-trivial use,
> we'll need a copyright assignment, since your patch is large enough to
> require that.  Can you sign one?

Sure thing.

-- Michael

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