Trying to load a broken DMS will stall WinUAE

andreas · 12 December 2008, 12:44

Hi,

I've just experienced a WinUAE stall by accidentally using a broken DMS. This DMS was not totally broken but only gave an unpacking error during operation.

Toni, a way I'd suggest to handle this properly could be a message box or the like telling "Unable to load DMS - file is corrupt!" instead of loading the partial data on it anyway as if nothing happened, which would not make much sense.

Toni Wilen · 12 December 2008, 13:34

It thinks the DMS file is encrypted and tries to brute-force it which takes very long because it can never succeed...

There is no bit (afaik) in DMS that says "encrypted", only difference is failed checksum.. (there are 2 checksums, first is ok, second fails = encrypted. usually..)

I guess workaround is to check if first track is not encrypted = other tracks can't be encrypted either. (in theory you can encrypt only single track but I guess that is not done in practise, at least I hope so..)

OddbOd · 12 December 2008, 16:01

There's an encryption flag in the geninfo bit field (archivers/dms/pfile.c line 176)

andreas · 12 December 2008, 21:11

OK you may look, I will upload the non-working DMS2 of Artifice demo to the zone, so you can see yourself.

12 December 2008, 12:44	#1
andreas Zone Friend Join Date: Jun 2001 Location: Germany Age: 50 Posts: 5,857	Trying to load a broken DMS will stall WinUAE Hi, I've just experienced a WinUAE stall by accidentally using a broken DMS. This DMS was not totally broken but only gave an unpacking error during operation. Toni, a way I'd suggest to handle this properly could be a message box or the like telling "Unable to load DMS - file is corrupt!" instead of loading the partial data on it anyway as if nothing happened, which would not make much sense.

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12 December 2008, 13:34	#2
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,540	It thinks the DMS file is encrypted and tries to brute-force it which takes very long because it can never succeed... There is no bit (afaik) in DMS that says "encrypted", only difference is failed checksum.. (there are 2 checksums, first is ok, second fails = encrypted. usually..) I guess workaround is to check if first track is not encrypted = other tracks can't be encrypted either. (in theory you can encrypt only single track but I guess that is not done in practise, at least I hope so..)

12 December 2008, 16:01	#3
OddbOd Registered User Join Date: Jul 2005 Location: Australia Age: 47 Posts: 666	There's an encryption flag in the geninfo bit field (archivers/dms/pfile.c line 176)

12 December 2008, 21:11	#4
andreas Zone Friend Join Date: Jun 2001 Location: Germany Age: 50 Posts: 5,857	OK you may look, I will upload the non-working DMS2 of Artifice demo to the zone, so you can see yourself.

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