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Re: FSFS format7 and compressed XML bundles

From: Ben Reser <ben_at_reser.org>
Date: Fri, 1 Mar 2013 08:03:56 -0800

On Thu, Feb 28, 2013 at 12:08 PM, Stefan Fuhrmann
<stefan.fuhrmann_at_wandisco.com> wrote:
> ZIP - in contrast to .tar.gz - compresses each of these files
> individually and then mainly concatenates them into the
> result file. As long as you don't change the template or
> any of the existing pictures, for instance, larger parts of
> the file should remain unchanged. PowerPoint presentations
> are probably the ones that benefit most from this scheme.
>
> Format7 will (hopefully) be able to deal with a few 100kB of
> inserted / removed data and still find all matching regions.
> This is exactly what we expect from office files: changes
> should affect some of the opaque data blocks but leave
> other ones alone.

In that case you're right it would help. But it'll only help on the
file level. I'm not entirely convinced that changes can ever be
limited to just one or a few files with the Office formats. I'm sure
there are cases that this does happen, but the question is if it
really is enough cases to result in any additional efficiency in
practice. Obviously, your changes are useful for other reasons than
just Office files. So I guess we'll see what happens when this is
used in practice.
Received on 2013-03-01 17:04:34 CET

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