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jvc_dsk: Fix MT #06779

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This commit is contained in:
Dirk Best 2017-11-29 10:18:48 +01:00
parent 1826aa157e
commit 5676444d8c
1 changed files with 11 additions and 7 deletions
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18
src/lib/formats/jvc_dsk.cpp
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@ -84,16 +84,20 @@ bool jvc_format::parse_header(io_generic *io, int &header_size, int &tracks, int
int os9_total_sectors = pick_integer_be(os9_header, 0x00, 3);
int os9_heads = BIT(os9_header[0x10], 0) ? 2 : 1;
int os9_sectors = pick_integer_be(os9_header, 0x11, 2);
int os9_tracks = os9_total_sectors / os9_sectors / os9_heads;
// now let's see if we have valid info
if ((os9_tracks * os9_heads * os9_sectors * 256) == size)
if (os9_total_sectors > 0 && os9_heads > 0 && os9_sectors > 0)
{
tracks = os9_tracks;
heads = os9_heads;
sectors = os9_sectors;
int os9_tracks = os9_total_sectors / os9_sectors / os9_heads;
osd_printf_verbose("OS-9 format disk image detected.\n");
// now let's see if we have valid info
if ((os9_tracks * os9_heads * os9_sectors * 256) == size)
{
tracks = os9_tracks;
heads = os9_heads;
sectors = os9_sectors;
osd_printf_verbose("OS-9 format disk image detected.\n");
}
}
}