[CDG5] Random questions

[Jason Duerstock]

I haven't found a whole lot about resource compression so far, but
there is this:

http://preserve.mactech.com/articles/mactech/Vol.09/09.01/ResCompression/index.html

Surprisingly, there is also this tidbit from:
http://preserve.mactech.com/articles/mactech/Vol.12/12.08/OS8Checklist/index.html

"9. Don’t use compressed resources. Resources which are decompressed
with the undocumented “dcmp” mechanism in System 7 will not be
compatible with Mac OS 8. Resources which are compressed with other
third-party mechanisms such as Application VISE will continue to
work."

Considering they're still being used in OS 9, I don't know what to
think of that other than "huh?".

The following files detail the "Donn" and "Greggy" codecs:

https://github.com/elliotnunn/CubeE/blob/master/Patches/GreggyBitsDefProc.a
https://github.com/elliotnunn/CubeE/blob/master/Patches/DeCompressDefProc.a

I can try to make a Python decompress for the above if you want.

Jason

On Tue, Nov 27, 2018 at 10:00 PM Elliot Nunn <elliotnunn at fastmail.com> wrote:
>
> 1. The Classic file seems to act as a System Enabler ("Gibbly").
>
> 2. Hadn't seen that new Lua port -- very cool! I wonder if MPW could
>    eventually be persuaded to run binary Tools reentrantly. It would
>    obviate a lot of MPW Shell hackery.
>
>    Sadly I had trouble ever getting ToolDaemon to work. My workaround
>    for a while was to SSH into a Tiger machine and send an Apple Event
>    to ToolServer from there.
>
> 3. I have briefly looked into the on-disk encoding of compressed
>    resources, in order to prevent
>    [SimpleDeRez](https://pypi.org/project/macresources/) from choking on
>    them. The scheme seems to rely on executable resources in the same
>    file, and I'm naturally not keen to emulate those. But if you have
>    some docs on the common format(s), then I am all ears!
>
>    Bin-patching compressed resources for BuildCubeE has been
>    frustrating. So far I have just opened them in ResEdit for
>    decompression.
>
> > On 28 Nov 2018, at 12:57 am, Jason Duerstock <jason.duerstock at gmail.com> wrote:
> >
> > 1) Does anyone know how things get loaded from the "Classic" file in
> > the System Folder?  Does this happen under native 9.x, or only under
> > OS X?
> >
> > 2) If you haven't seen these before:
> > https://github.com/SolraBizna/MacLua5.3
> > https://github.com/fblondiau/ToolDaemon
> > http://www.kallisys.com/files/mac/toolserver(1)-1.2.dmg
> >
> > 3) Has anyone looked into compressed resources and the associate
> > 'dcmp' and 'ncmp' resources?  I'm wondering if it would be handy to
> > have an lz4 resourcecompressor/decompressor.  Or if there would be
> > another lossless codec that would be more appropriate.
> >
> > Thanks,
> >
> > Jason
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