[CDG5] Random questions
Elliot Nunn
elliotnunn at fastmail.com
Thu Nov 29 08:00:12 AWST 2018
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
>>> _______________________________________________
>>> cdg5 mailing list
>>> cdg5 at ucc.asn.au
>>> https://lists.ucc.gu.uwa.edu.au/mailman/listinfo/cdg5
>>
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