On 10/06/2013 10:44 PM, Rob Weir wrote:
On Sun, Jun 9, 2013 at 4:01 PM, Dennis E. Hamilton
<dennis.hamil...@acm.org> wrote:
Regina is correct about the only two compressions. As far as I know, there is
no way to control which compression is used. (If you save with Password, all
files are always compressed.) Most of the time DEFLATE is used (although there
are two files that are not usually compressed, apparently to make metadata
mining simpler for non-encrypted packages).
There is currently no way to control the compression in AOO. (The ODF
specification simply stipulates the compression that must be used when
compression is done, not whether compression is done for parts of unencrypted
packages.)
Does anyone know whether AOO is smart enough to not waste time trying
to compress already compressed files, like PNG images? This could
make a big difference in presentations.
-Rob
Could anyone explain why it is necessary to compress Autorecovery
information. it is only used to recover when the system crashes.
In my opinion it should only compress when a user close the document.
I don't think it is the compression that is responsible for the slow-downs, it
has to do with other work that goes on in order to save a file.
If you are careful about regularly saving manually while you are working, and
you work into a new copy so the starting version can't be damaged, you can
disable auto-save to avoid being interrupted in the midst of something you are
doing. There may be some glitches that cause the time to increase in certain
situations and those are caught from time to time. Using the latest version
usually includes those improvements. I suspect there are some other
performance issues around Save (and Auto-Save) that are more involved.
- Dennis
-----Original Message-----
From: Regina Henschel [mailto:rb.hensc...@t-online.de]
Sent: Sunday, June 9, 2013 11:41 AM
To: users@openoffice.apache.org
Subject: Re: [DISCUSS] ODF file formats vs Zip
Hi Johnny,
Johnny Rosenberg schrieb:
When working with big files, in my case spreadsheets, but possibly
other types of office files, saving the file will in some cases take a
lot of time. This is particularly annoying when auto-saving is
enabled. As I understand it, an ODF is a couple of files, most of them
XML files, brought together in a single file, then compressed to the
zip format.
Does the ODF standard specify the compression ratio?
There are two methods possible STORED and DEFLATED, see
http://docs.oasis-open.org/office/v1.2/os/OpenDocument-v1.2-os-part3.html,
section 2.2.
If not, it would
be convenient if the user could specify that. For example, if I prefer
saving to be as fast as possible, I could specify no compression at
all, just bring the files together in a tar-ball (if that's allowed)
or as an uncompressed zip.
I don't know how much of the required time to save a file is used for
compression, but I imagine that there is room for speed enhancements
here.
If this is not the way to go, maybe the extension could change as
well, indicating this is another file format, although conversion to
and from ODF should be very straight forward…
Using another compression is still .zip file format.
ODF has a flat file format without container too. This is implemented in
LO but not in AOO. But in the flat format all pictures are stored in
base64, because there is no folder to store them in original format.
Thoughts about this?
It would need tests to see, whether the method STORED is significant faster.
Kind regards
Regina
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