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2013-04-07T22:45:39  <GreaseMonkey> apparently you guys are working on PC98 patches, i take it you've cracked the .exe compression they've used?
2013-04-07T22:46:14  <GreaseMonkey> my attempts do successfully decompress at least TH05's op.exe but unfortunately i get the STOP error, probably because i don't deal with that really weird entry point they use
2013-04-07T22:46:43  <linkmauve1> Nmlgc isn’t here yet, it’s him that is doing most of the work.
2013-04-07T22:46:45  <GreaseMonkey> wait nvm apparently you have this in the bag
2013-04-07T22:47:24  <linkmauve1> I didn’t even know they compressed the executables. ^^
2013-04-07T22:48:33  <GreaseMonkey> i reverse engineered the compression by essentially doing a direct port of the asm to python
2013-04-07T22:51:07  <GreaseMonkey> https://gist.github.com/iamgreaser/1a9930bfeda83931f39e
2013-04-07T22:51:08  <[Bot]MagicStone> Title: this should decompress TH05s OP.EXE, look for a DLZ0 signature at 0x1C to see if any .exe is compressed, this WILL need to be genericised sadly --GreaseMonkey (at gist.github.com)
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2013-04-07T22:52:05  <GreaseMonkey> Nmlgc:
2013-04-07T22:52:06  <GreaseMonkey> <GreaseMonkey> i reverse engineered the compression by essentially doing a direct port of the asm to python
2013-04-07T22:52:07  <GreaseMonkey> <GreaseMonkey> https://gist.github.com/iamgreaser/1a9930bfeda83931f39e
2013-04-07T22:52:08  <[Bot]MagicStone> Title: this should decompress TH05s OP.EXE, look for a DLZ0 signature at 0x1C to see if any .exe is compressed, this WILL need to be genericised sadly --GreaseMonkey (at gist.github.com)
2013-04-07T22:52:16  <GreaseMonkey> apparently you're the one responsible for the PC98 stuff
2013-04-07T22:52:21  <Nmlgc> Yup.
2013-04-07T22:52:29  <Nmlgc> PC-98 executables are compressed using Diet
2013-04-07T22:52:41  <GreaseMonkey> fff i guess that was redundant then @_@
2013-04-07T22:55:25  <GreaseMonkey> by the way how far are you guys through applying the translations and whatnot?
2013-04-07T22:55:53  <Nmlgc> https://www.dropbox.com/s/qvldb84teljmga9/TRON.EXE << This is the decompressor I use for development; we probably won't be needing an open-source implementation because I'll be patching the games in memory
2013-04-07T22:55:55  <[Bot]MagicStone> Title: Dropbox - TRON.EXE (at www.dropbox.com)
2013-04-07T22:56:11  <Nmlgc> We're still at the very beginning, setting up the environment and stuff -.-
2013-04-07T22:57:16  <linkmauve1> GreaseMonkey, I don’t know if you are interested in that, but I started reverse-engineering various data formats, some of the documentation is here: http://pytouhou.linkmauve.fr/doc/04/ and some is in a few patches against PyTouhou I started writing a long time ago, here: http://pytouhou.linkmauve.fr/98/
2013-04-07T22:57:20  <[Bot]MagicStone> Title: Lotus Land Story (at pytouhou.linkmauve.fr)
2013-04-07T22:57:37  <GreaseMonkey> oh yeah does anyone have a file format spec for .hdi?
2013-04-07T22:57:42  <GreaseMonkey> i DO know how to do FAT stuff
2013-04-07T22:58:04  <linkmauve1> It’s an useless header and then a normal msdos partition table with a fat16 partition.
2013-04-07T22:58:22  <Nmlgc> This is still going to take very, very long because we're going multilingual, I'll try to implement proportional font rendering (because 8x16 fixed-width was apparently not enough) and there's Touhou 14 coming out soon, which will be our top priority for a month or two
2013-04-07T22:58:24  <linkmauve1> A very minimal documentation is on top of the page I just linked.
2013-04-07T22:58:39  <GreaseMonkey> k
2013-04-07T22:59:01  <GreaseMonkey> oh brilliant, even gives me the commands i need to screw with it, thanks
2013-04-07T22:59:40  <Nmlgc> linkmauve1: Except that this header is not _that_ useless if you have different HDIs :-)
2013-04-07T23:00:47  <linkmauve1> I know it’s not entirely useless, but for most purposes it isn’t needed. :p
2013-04-07T23:02:49  <linkmauve1> I will do a free reimplementation of a few PC-98 Touhou in some far future, but currently we are focused on a better EoSD support, finishing the initial PCB support and extending the compatibility of our engine.  Switching to a pure SDL2/OpenGL wrapper helped a lot for non-Linux support or non-X11.
2013-04-07T23:03:06  <linkmauve1> But I won’t forget PC-98. :)
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2013-04-07T23:06:34  <GreaseMonkey> i'm adding 80186 opcodes to my disassembler which i used to disassemble ZZT
2013-04-07T23:07:16  <linkmauve1> What is ZZT?
2013-04-07T23:07:51  <GreaseMonkey> old game creation system
2013-04-07T23:08:00  <GreaseMonkey> written in turbo pascal
2013-04-07T23:08:09  <GreaseMonkey> looking at the disassembly, i just about throw up as to how unoptimised the code is
2013-04-07T23:08:30  <GreaseMonkey> and this is pertaining to how turbo pascal compiles stuff
2013-04-07T23:09:40  <linkmauve1> I found some pearls reading EoSD. ^^
2013-04-07T23:10:04  <linkmauve1> I guess it has been compiled from C++, but microsoft’s compiler did a very poor job at optimizing it.
2013-04-07T23:11:07  <linkmauve1> I found funny that the debug strings were still present, just the display function was changed to a noop, so we could add back a printf and it would work. :D
2013-04-07T23:11:49  <linkmauve1> Or how his short arithmetic worked, after EACH operation on a short it does & 0xffff…
2013-04-07T23:13:48  <GreaseMonkey> i remember MSVC optimised a game in an amusing way which exposed a blatant (but extremely obscure and virtually never-triggered) bug
2013-04-07T23:13:51  <GreaseMonkey> ?_4490: xor     eax, eax                                ; 00427477 _ 33. C0
2013-04-07T23:13:51  <GreaseMonkey> ?_4491: mov     eax, dword [eax]                        ; 00427479 _ 8B. 00
2013-04-07T23:14:04  <GreaseMonkey> only in very rare cases will it ever hit ?_4490
2013-04-07T23:15:19  <GreaseMonkey> fff now i have to implement 0x66 in my disasembler >_<
2013-04-07T23:15:45  <GreaseMonkey> ...giving up and using tron
2013-04-07T23:16:25  <linkmauve1> I disagree with Nmlgc, of course we’ll need a free decompressor, but having a non-free one will probably help.
2013-04-07T23:16:36  <GreaseMonkey> ...which crashes dosbox >_<
2013-04-07T23:16:48  <GreaseMonkey> i might as well start a git repo
2013-04-07T23:18:41  <linkmauve1> Maybe it’s a PC-98 tool.
2013-04-07T23:18:57  <linkmauve1> Try it under a PC-98 emulator, instead of a PC one.
2013-04-07T23:19:53  <GreaseMonkey> on the other hand some stuff works on PC-98 as well as PC
2013-04-07T23:20:01  <GreaseMonkey> thanks for that note though
2013-04-07T23:20:18  <GreaseMonkey> i MAY use my disassembler to force it to work on dosbox though :P
2013-04-07T23:20:25  <linkmauve1> ^^
2013-04-07T23:20:44  <linkmauve1> Even if they both use the same processor, the whole architecture is very different.
2013-04-07T23:21:12  <GreaseMonkey> started: https://github.com/iamgreaser/mzdis
2013-04-07T23:21:13  <[Bot]MagicStone> Title: iamgreaser/mzdis · GitHub (at github.com)
2013-04-07T23:21:33  <GreaseMonkey> still, if they simply stick with INT 0x21, it should be portable
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2013-04-07T23:22:17  <GreaseMonkey> but yeah i'll need to rework the disassembler to handle 80386 stuff
2013-04-07T23:22:48  <Nmlgc> Strange, Tron just worked on cmd for me... but that was back when I still used 32-bit Windows XP
2013-04-07T23:23:42  <GreaseMonkey> and i'm using 64-bit linux hence dosbox
2013-04-07T23:24:14  <linkmauve1> GreaseMonkey, if it’s really a dosbox crash you may want to report it upstream.
2013-04-07T23:24:50  <GreaseMonkey> ok it's an issue with the dynamic core
2013-04-07T23:25:16  <GreaseMonkey> ffffff i was looking for a disassembler not an unpacker >_<
2013-04-07T23:25:34  <GreaseMonkey> anyhow i have to head to uni, cya
2013-04-07T23:25:51  <linkmauve1> \o_
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