[CDG5] Random questions

[Jason Duerstock]

I believe the 'dcmp' resources were reimplemented as 'ncmp' for PPC code.

I will try to take a stab at the Donn and Greggy stuff in the next week or so.

Also, if you haven't seen it: https://github.com/avast-tl/retdec

It's not really any use on the m68k code, but it does work against
PPC.  You have to trim out the raw bits from the PEF file you want to
process though.

Jason
On Wed, Nov 28, 2018 at 7:01 PM Elliot Nunn <elliotnunn at fastmail.com> wrote:
>
> If you see any documentation promising big changes in "Mac OS 8", think
> Copland. Of course that was cancelled, and some of its high-level
> improvements got backported to a System 7-based Mac OS 8 and 9.
>
> I note that 'dcmp' 0, 1 and 2 did not change from 7 to 9, but that a
> 'dcmp' 3 was also added. (None of these resources contains any PowerPC
> code.) Yes, please implement these in Python! I will get them into
> macresources. Re-compression would be even better!
>
> > On 28 Nov 2018, at 10:44 pm, Jason Duerstock <jason.duerstock at gmail.com> wrote:
> >
> > 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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> >>
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