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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