Hi,
Michael Devore escribió:
After three days of on-and-off hacking on it, I built a mutant UPX 1.25
to compress EMM386.EXE and HIMEM.EXE to work both as a device driver and
as a stand-alone EXE file. As almost always is the case, the actual
changes were small, figuring them out was the hard part.
Very interesting and nice job, Michael! I hope to see a place where to
get such a beast in the remaining 20 messages I have to read :)
Using the custom mutated UPX will eliminate SY3PACK closed-source
issues, including the 80186-level requirements for the [de]compressor (I
think that's the SY3PACK minimum CPU opcode req).
What will make you sad is that SY3PACK compression actually beats UPX by
a few hundred bytes on each of HIMEM and EMM386 files, but file growth
is what you'll have to live with to keep the masses happy. SY3PACK
winning may be due to the UPX rebuildable open source using the less
efficient UCL compression library than the optimal UPX build which uses
the closed-source NRV big-brother version. I can't do anything about
that, either.
So did you manage to build UPX with the UCL library? I tried some time
ago, failed and forgot about it. I am not saying that I did a big
research, but the simple/plain first try didn't work.
So could you make that mutatn UPX/UCL file downloadable somewhere? I am
hightly interested on that (provided that it can still compress the
regular COM/EXE/SYS files), and furthermore, I think it'd be quite
interesting to be used in the whole FreeDOS for all the programs and
drivers.
Aitor
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