SCUMMVM game datafiles check

dooplex · Post by **dooplex** » Fri Apr 03, 2009 5:05 pm

Does SCUMMVM check wether all of the games data files are complete when adding a game?

I did a few short experiments on this and SCUMMVM never complained. F.e. I deleted some of the .LFL files from Maniac Mansion and tried to play it. I had no problems so far, but then I haven't played through the whole game with this "handicapped" version, of course. I'm sure there would be if I played further.

Originally I got this idea when I simultaneously compressed the audio data files from "Inherit the Earth" using two command windows at the same time. The temp files got mixed up and I got strange results (strange file sizes, game didn't run properly).

Maybe a data file check is out of question for the same reasons that zipped file support is?

Post by **sev** » Fri Apr 03, 2009 5:45 pm

No, we don't check game data integrity at all.

The main reason is the giantic effort of supporting those lists. For instance, Big Red Adventure for DOS uses 2588 files....

Eugene

dooplex · Post by **dooplex** » Sat Apr 04, 2009 12:10 am

This problem goes even worse if you count all the different language versions of a game, too...

So I figure that the exact version of a game is decided by just using the size and CRC32/MD5 of one or two files (in the case of C64/NES versions maybe something else)?

I guess this is nothing new for most of us, but the Passigar project collected CRC32s for all SCUMM, AGi & SCI games a while ago.
http://www.sqeagz.com/passigar/

The project is finalized, so it should be complete.

Post by **sev** » Sat Apr 04, 2009 5:27 am

Heh, it is no way complete. Just compare it with our list of MD5 list for SCUMM games here. And those are just SCUMM games.

Eugene

Red_Breast · Post by **Red_Breast** » Sat Apr 04, 2009 3:47 pm

Looking at that list the first game Maniac and all the different versions from various countries reminded me of that Japanese version of the game for the Famicom.
I take it that it won't play with ScummVM. Do you know if it even uses the SCUMM engine or did Jaleco rig up something else for it. It looks so...different.

By the way about Big Red Adventure has 2000+. I know Bud Tucker has 4000+ .wavs. So there.

I don't have all the ScummVM games (far from it). But does any game top Bud Tucker for amount of game files?

clone2727 · Post by **clone2727** » Sat Apr 04, 2009 5:29 pm

Red_Breast wrote:Do you know if it even uses the SCUMM engine or did Jaleco rig up something else for it. It looks so...different.

It does not use SCUMM.

sanguinehearts · Post by **sanguinehearts** » Sat Apr 04, 2009 6:40 pm

The only similarity is the story.
I believe Jaleco created a new engine for the game
Interestingly enough according to David Fox it was briefly discussed that this engine would simply be re-used for the standard release of the game on the NES, but I believe the general consensus was that the game was ugly and Lucasarts could do a lot better!

This version was infact released before the NES port, and since there is so much talk about the NES port and how it used SCUMM its likely that they would not have re-ported the game afterwards.

I still have all the research and documents I gathered while looking at this game, and I do intend on working on it a little more, perhaps when I have some more time.