Re: [OpenBIOS] Viewing files on HFS volume

[Programmingkid]

On Sep 10, 2012, at 10:59 PM, [e-mail] wrote:
> Message: 7
> Date: Sun, 09 Sep 2012 23:33:13 +0100
> From: Mark Cave-Ayland 
> To: The OpenBIOS Mailinglist 
> Subject: Re: [OpenBIOS] Viewing files on HFS volume
> Message-ID: 
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> On 06/09/12 13:47, Programmingkid wrote:
> > I am trying to open a Macintosh CD in OpenBIOS. When I use this command to view the files: dir cd:, I receive an error message stating that mac-parts could not determine the file system on the disc. Has any one been able to view files on a HFS disc?
>
> IIRC there was a bug reported in the HFS partition calculation code in 
> OpenBIOS (possibly my fault after some refactoring?). It shouldn't be 
> too difficult to fix, but if you're struggling then I don't mind taking 
> a look if you can supply a test image.

Here is the test image you requested. It is a CD image I created in Disk Utility. I couldn't make a HFS volume, so I had to settle with an HFS+ volume. I did test it out and QEMU gave me the same error I saw with an Apple supplied CD.

Thanks for helping.

Viewing files on HFS volume

[Mark Cave-Ayland]

On 11/09/12 14:49, Programmingkid wrote:
> Here is the test image you requested. It is a CD image I created in Disk
> Utility. I couldn't make a HFS volume, so I had to settle with an HFS+
> volume. I did test it out and QEMU gave me the same error I saw with an
> Apple supplied CD.
>
> Thanks for helping.

I took a look at this, and initially it was fairly easy to see why the 
dir command doesn't work for HFS+ disks:

0 > dir cd:2,\ dir method not implemented for HFS+ filesystem
  ok

And this is reflected obviously in the code here:

static void
hfsp_files_dir( hfsp_info_t *dummy )
{
     forth_printf("dir method not implemented for HFS+ filesystem\n");
     POP();
     POP();
     POP();
}

Now writing an implementation of dir for HFS+ doesn't look too 
difficult, however in the code I've quickly put together libhfsp is 
looking in totally the wrong part of the disk for the backup block even 
though the disk extents look sensible. Will continue digging.

ATB,

Mark.

Viewing files on HFS volume

[Mark Cave-Ayland]

On 17/09/12 19:53, Mark Cave-Ayland wrote:
> Now writing an implementation of dir for HFS+ doesn't look too
> difficult, however in the code I've quickly put together libhfsp is
> looking in totally the wrong part of the disk for the backup block even
> though the disk extents look sensible. Will continue digging.

Okay I've got it - looks like volume_open() currently gets confused when 
trying to open a volume where the block size is not 512 bytes (in the 
case of your CD image it is 4096 bytes). I have now implemented a basic 
dir word (patch to follow shortly) which gives the following output 
against your image:

Welcome to OpenBIOS v1.0 built on Sep 18 2012 15:11

0 > dir cd:2,\
       6148 2012-09-11 13:41:40  .DS_Store
          0 2012-09-11 13:41:20  .fseventsd\
          0 2012-09-11 13:41:20  .HFS+ Private Directory Data?\
          0 2012-09-11 13:42:08  .TemporaryItems\
          0 2012-09-11 13:41:20  .Trashes\
          0 2012-09-11 13:41:40  Folder 1\
          0 2012-09-11 13:41:44  Folder 2\
         29 2012-09-11 13:42:08  readme.txt
          0 2012-09-11 13:41:20  HFS+ Private Data\
  ok
0 > dir cd:2,.fseventsd
        294 2012-09-11 13:42:57  0000000007c7a66b
         36 2012-09-11 13:41:20  fseventsd-uuid
  ok
0 > dir cd:2,\Folder 1
   (Empty folder)
  ok
0 > dir cd:2,\Folder 2
   (Empty folder)
  ok
0 > dir cd:2,\Folder 3
Unable to locate path \Folder 3 on filesystem
  ok

Note that we don't (yet) do autolocation of partitions which is why the 
cd:2 notation is needed to manually point towards the second partition 
on the CD. Please test and let me know how you get on with your original 
Apple CD.

ATB,

Mark.