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Added support for larger WinUAE-generated hardfiles.

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This commit is contained in:
Alastair M. Robinson
2020-11-21 14:47:17 +00:00
parent ed383b6bf7
commit e73a21a24d
1 changed files with 18 additions and 3 deletions
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21
hdd.c
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@@ -630,11 +630,26 @@ void GetHardfileGeometry(hdfTYPE *pHDF)
switch(pHDF->type) {
case (HDF_FILE | HDF_SYNTHRDB):
if (pHDF->file.size == 0) return;
// For WinUAE generated hardfiles we have a fixed sectorspertrack of 32, number of heads and cylinders are variable.
// Make a first guess based on 1 head, then refine that guess until the geometry gives a plausible number of
// cylinders and also has the correct number of blocks.
total = pHDF->file.size / 512;
pHDF->heads = 1;
pHDF->sectors = 32;
pHDF->cylinders = total/32 + 1; // Add a cylinder for the fake RDB.
return;
head=1;
cyl = total/32;
cyllimit-=1; // Need headroom for an RDB
while(head<16 && (cyl>cyllimit || (head*cyl*32)!=total))
{
++head;
cyl=total/(32*head);
}
pHDF->heads = head;
pHDF->cylinders = cyl+1; // Add a cylinder for the fake RDB.
if ((head*cyl*32)==total) // Does the geometry match the size of the underlying hard file?
return;
// If not, fall back to regular hardfile geometry aproximations...
break;
case HDF_FILE:
if (pHDF->file.size == 0) return;
total = pHDF->file.size / 512;