ROM sub-directories on DVD = CRASH

[GoogleCodeExporter]

Hi!

I'm having problems with Genesis Plus GX 1.4.1. I have two DVDs that I've 
burned with ROMs for various systems. Here is some information on both of these 
discs:

First disc: root directory has six folders, none of these folders have 
sub-directories
Second disc: root directory has six folders, the Genesis folder is divided into 
five sub-directories

The first disc mounts and loads fine in Genesis Plus GX. However, the second 
disc crashes with an "Exception (DSI) occurred!" error message. The only 
differences with the Genesis folder on both of these discs are that there are 
sub-directories and more ROMs.

What can I do about this?

Original issue reported on code.google.com by JJBu...@gmail.com on 6 Feb 2011 at 10:13

[GoogleCodeExporter]

The DVD I use has many subdirectories and it does not crash so no, this is not 
the issue.

Without a screenshot of the DSI exception screen, there is nothing i can do, so 
please provide one or copy the stuff you see when it crashes.

I also need more detailled informations as i can't reproduce the crash:
Does it happen EVERYTIME you browse that specific DVD or is it random ?
When does the crash EXACTLY occurs ? As soon as you choose "load from dvd" ? 
When you go to a specific directory ? When you try to load a game ?

Also try to delete config.ini file from genplus directory and see if that 
helps...

Original comment by ekeeke31@gmail.com on 7 Feb 2011 at 2:47

[GoogleCodeExporter]

Sorry for not being more specific!

First, here's the error message I'm getting:

Exception (DSI) occurred!
GPR00 1A3F0B18 GPR08 80000000 GPR16 0000004E GPR24 80360000
GPR01 804C1000 GPR09 E6BF9C88 GPR17 000001C3 GPR25 814AA000
GPR02 80246B80 GPR10 00000005 GPR18 802E2121 GPR26 00001000
GPR03 815AF000 GPR11 680A3138 GPR19 802E2122 GRP27 E6BF9C98
GPR04 00001000 GPR12 20000008 GPR20 00000000 GPR28 814A94B0
GPR05 00104360 GPR13 80250160 GPR21 001042D0 GPR29 804A1BE0
GPR06 0000007F GPR14 62B2A156 GPR22 813A51E0 GPR30 8024FA58
GPR07 00000000 GPR15 00000029 GPR23 80250000 GPR31 00104368
LR 8011B454 SRR0 8011b4a0 SRR1 00009032 MSR 00001000
DAR 680A313C DSISR 06000000

STACK DUMP:
8011b4a0 --> 8011b454 --> 800e6630 --> 800e6a60 -->
800e6b5c --> 80038fec --> 800dd498 --> 800dd968 -->
800dbfbc

CODE DUMP:
8011b4a0:  914B0004 914B0008 817C0004 556B07FE
8011b4b0:  7D295B78 913C0004 419D0320 3D208025
8011b4c0:  81690760 7F805840 409D0008 90090760

This does happen every time I try to mount this particular DVD. I choose "Load 
game," then "From DVD." The window saying "Mounting DVD" appears, then the 
program crashes. I have tried deleting the config.ini file and that does not 
help.

Original comment by JJBu...@gmail.com on 7 Feb 2011 at 6:42

[GoogleCodeExporter]

Here is the code path leading to crash:

_malloc_r <-- entry_from_path <-- _ISO9660_diropen_r <-- diropen <-- 
ParseDirectory <-- OpenDirectory

As you can see, the crash is within libogc, not within Genesis Plus GX code, 
and more specifically in the libiso9660 library which should handles ISO9660 
DVD file system.

This can be due to a DVD with wrong format or a bug within the library that 
cause it to crash, have you tried that particular DVD with other emulators ?

Otherwise, Genesis Plus GX 1.4.1 has been compiled with libogc 1.8.5, you could 
also try compiling with 1.8.6 and see if this fixes the issue. 

For your own information, here's what the emulator does usually: first it tries 
to open dvd:/ using libiso9660, and if an error is returned, it tries to mount 
the disc (you should see a message saying "mounting dvd"). Once mounted, it 
tries to open last opened directory: directory name is saved in config.ini file 
and is set to dvd:/genplus/roms by default. If not found, the emulator opens 
dvd:/ which let you browse from DVD root directory. Here, the crash seems to 
happen AFTER dvd has been mounted (do you confirm ?), when opening default 
directory. Only reason I see is that somehow the DVD has an unsupported file 
system.

Original comment by ekeeke31@gmail.com on 7 Feb 2011 at 9:38

[GoogleCodeExporter]

To be sure, could you paste the directory structure of both discs (the one that 
works and the other that does not work) ?

Original comment by ekeeke31@gmail.com on 7 Feb 2011 at 9:40

[GoogleCodeExporter]

Original comment by ekeeke31@gmail.com on 11 Feb 2011 at 7:37

• Changed state: Invalid

[GoogleCodeExporter]

I have some news to report! I tried burning the same files on another DVD with 
an earlier version of the burning software I use (ImgBurn) and it loads fine! 
I'll get in touch with the maintainers of libogc to notify them of this issue.

Original comment by JJBu...@gmail.com on 16 Feb 2011 at 11:37