iso [NOT GAMES] mount in RDWR mode

phobox · Post by **phobox** » Sun Oct 12, 2008 5:14 am

hi,
i wanted to know if it possile to mount an iso file to a filesystem like "isofile:/" and set read and write permissions in order to access the contents of that iso...

i thought i can use m33 sdk in order to mount an iso/cso but then? how to set read and WRITE?

J.F. · Post by **J.F.** » Sun Oct 12, 2008 6:02 am

That's easy! Write your own filesystem. :P

phobox · Post by **phobox** » Sun Oct 12, 2008 6:15 am

J.F. wrote:That's easy!

oh sure!

Seriously...
Can you give me an hint or something to start with? iso mounting on pc is possible is it the same on psps?

J.F. · Post by **J.F.** » Sun Oct 12, 2008 7:10 am

ISOs are pretty much read-only. That's why you have to get special programs that have writing in the app to write to ISOs (in Windows, for example, ISO Master or ISO Buster). I don't expect the PSP to even have the ability to write ISO format, just read it. You're lucky the PSP has the ability to write to FAT. :)

Torch · Post by **Torch** » Sun Oct 12, 2008 11:40 am

Even if you wrote a filesystem layer, the structure of an ISO requires it to be recreated from scratch if you add a file or something.

Dariusc123456 · Post by **Dariusc123456** » Sun Oct 12, 2008 11:48 am

Not even a cso(compress iso) can we rewritten without rewritting the file structure. I not sure if I said that right, but the point is that you cant just make a code to write an a iso file in homebrew, its hard if you dont have the proper source file to get you started with.

Onii · Post by **Onii** » Sun Oct 12, 2008 12:02 pm

I doubt you'll find anything pre-built to do this. ISO 9660 was designed with read-only in mind.

But if you're serious about it and want to "roll your own" first two links in the "External Links" section of the ISO 9660 wikipedia entry (http://en.wikipedia.org/wiki/ISO_9660) are pretty informative. The first being the spec for ISO 9660: 1988 and the second is the 1999 update thereto.

As far as having the PSP see it in Read only mode as isofile: some of the more experienced PSP guys will have to comment on that. I imagine it would not be trivial.

Torch · Post by **Torch** » Sun Oct 12, 2008 12:38 pm

For read-only, I assume it will be visible as disc0: if you mount it using the m33 sdk functions.

sauron_le_noir · Post by **sauron_le_noir** » Mon Oct 13, 2008 12:27 am

More serious try to port the fuse framework to the psp
http://fuse.sourceforge.net/wiki/index.php/FuseIso

look at the source of the fuseio

http://sourceforge.net/project/showfile ... _id=569596

in fuseio.c

you can directly use
static int isofs_open(const char *path, struct fuse_file_info *UNUSED(fi)) to open your iso
static int isofs_opendir(const char *path, struct fuse_file_info *UNUSED(fi)) to
enumerate the directies present on it etc ... etc .....

it's standard C. isofs.c contains all the bits a byte stuf to read a iso
a fuseio is just the interface that use the API provided by isofs.c so
have a look a fuseio and adapt it for psp;)