[softwarelist] Re: SparkFS 1.41 & RO 6
- From: Dave Symes <dfs@xxxxxxxxxxxxx>
- To: davidpilling@xxxxxxxxxxxxx
- Date: Sat, 02 Jun 2007 11:29:12 +0100
In article <2a7593ec4e.martin@xxxxxxxxxxxxxxxxxxx>,
Martin Wuerthner <public@xxxxxxxxxxxxxxx> wrote:
> In message <4eec79c97fdfs@xxxxxxxxxxxxx>
> Dave Symes <dfs@xxxxxxxxxxxxx> wrote:
> > In article <n5Dl4cERsIYGFwlO@xxxxxxxxxxxxxxxxxxx>,
> > David Pilling <flist@xxxxxxxxxxxxxxxxxxx> wrote:
> >
> >> *SparkFSMethod <type> <method>
> >> Sets the compression method for a given archive type.
> >>
> >> So something like
> >> *SparkFSMethod 4 0
> >> is the command you would issue.
> > I've done that, but the SparkFS Choices window still shows Type Zip
> > and Method Deflate, so how do I know the Obey file I've just double
> > clicked is going to give me a Zip archive and no compression?
> For that specific case, it is simple. After you have added some
> compressible data to the archive (plain text files or sprites are
> ideal - avoid compressed archives, GIF or JPEG images because they are
> already compressed), then count the contents of the archive, then
> count the archive size itself. Without compression, the archive size
> is a bit larger than the size of its contents. With compression, the
> archive size is substantially smaller.
Yes that's quite obvious.
> If you add large files you will notice the difference anyway - it is
> very fast for uncompressed archives and rather slow with "Deflate"
> compression.
Again quite obvious.
I'm obviously looking for something a bit more sophisticated than "Suck it
and See". ;-)
> Finally, just to avoid misunderstandings: The compression type is
> *not* a property of the archive. There are no such things as
> "uncompressed Zip files" and "compressed Zip files". The file does not
> say anything about the compression to be applied. Each individual item
> in the file can be either compressed or uncompressed. The
> SparkFSMethod commands do not control the compression when creating an
> archive. Rather, they control the compression used when adding files
> to the archive.
That's useful to know, as I wasn't aware of how it worked.
> You can easily create a mixed archive: Create a Zip file (no matter
> what your current SparkFS settings are), then type
> *SparkFSMethod 4 0
> and add a file. It is added without compression. Then, type
> *SparkFSMethod 4 8
> and add a file. It is added with Deflate compression.
How did you arrive at the "8" ? I can't see anything in the manual that
defines the level of compression like that?
> Martin
Thanks for the input Martin, I have learned a few things.
However it's all a bit of a bother, when I can just click up my second
copy with all the stuff ready configured, and actually see and know what's
going on.
Cheers
Dave S
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