[Bug 2338] DVD Shrink cannot Open Disc

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=2338

------- Additional Comments From [e-mail]  2004-25-07 02:40 -------
Here is the answer form the author; I splitted his answr in two part and put the
other part in bug 2339.

To see the original answer with correct indentation, please read here:
http://forum.digital-digest.com/showthread.php?s=&postid=183082#post1830...

--------------------
SC_GET_DISK_INFO is sent once for each device during ASPI initialization, while
searching for the CDROM device which matches the drive specified.

I attached some code snippets, if you need more information, feel free to
contact me directly: dvdshrink "at" dvdshrink.info

uint32 CDvdCSS::ScanASPIDevices(int ndrive, int nadapters)
{
    ASSERT(m_haspi);
    ASSERT(m_psend);

// scan each device adapter and lun until we find the one for our
    // drive...

for (int i = 0; i < nadapters; i++)
    {
    	for (int j = 0; j < 15; j++)
    	{
    		struct SRB_GetDiskInfo srbdisk = {0};
    		srbdisk.SRB_Cmd = SC_GET_DISK_INFO;
    		srbdisk.SRB_HaId = (uchar) i;
    		srbdisk.SRB_Target = (uchar) j;
    		m_psend((SRB_ExecSCSICmd *) &srbdisk);

// make sure we have a cdrom device!

if (srbdisk.SRB_Status == SS_COMP &&
    			srbdisk.SRB_Int13HDriveInfo == ndrive)
    		{
    			struct SRB_GetDEVBlock srbdev = {0};
    			srbdev.SRB_Cmd = SC_GET_DEV_TYPE;
    			srbdev.SRB_HaId = (uchar) i;
    			srbdev.SRB_Target = (uchar) j;
    			m_psend((SRB_ExecSCSICmd *) &srbdev);

if (srbdev.SRB_Status == SS_COMP &&
    				srbdev.SRB_DeviceType == DTYPE_CDROM)
    			{
    				return MAKEWORD(i, j);
    			}
    		}
    	}
    }

// oops!

ASSERT(0);
    throw new CError(ERROR_ASPI_FAILED);
}