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imd_dsk.cpp: Add some sanity checking on geometry

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This commit is contained in:
AJR 2018-07-27 23:42:59 -04:00
parent c72d28ba0c
commit 952bdf962a
1 changed files with 19 additions and 1 deletions
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20
src/lib/formats/imd_dsk.cpp
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@ -433,6 +433,9 @@ bool imd_format::load(io_generic *io, uint32_t form_factor, floppy_image *image)
if(pos >= size) if(pos >= size)
return false; return false;
int tracks, heads;
image->get_maximal_geometry(tracks, heads);
while(pos < size) { while(pos < size) {
uint8_t mode = img[pos++]; uint8_t mode = img[pos++];
uint8_t track = img[pos++]; uint8_t track = img[pos++];
@ -440,8 +443,23 @@ bool imd_format::load(io_generic *io, uint32_t form_factor, floppy_image *image)
uint8_t sector_count = img[pos++]; uint8_t sector_count = img[pos++];
uint8_t ssize = img[pos++]; uint8_t ssize = img[pos++];
if(track >= tracks)
{
osd_printf_error("imd_format: Track %d exceeds maximum of %d\n", track, tracks);
return false;
}
if((head & 0x3f) >= heads)
{
osd_printf_error("imd_format: Head %d exceeds maximum of %d\n", head & 0x3f, heads);
return false;
}
if(ssize == 0xff) if(ssize == 0xff)
throw emu_fatalerror("imd_format: Unsupported variable sector size on track %d head %d", track, head); {
osd_printf_error("imd_format: Unsupported variable sector size on track %d head %d", track, head & 0x3f);
return false;
}
uint32_t actual_size = ssize < 7 ? 128 << ssize : 8192; uint32_t actual_size = ssize < 7 ? 128 << ssize : 8192;