From b03bfd4df2a439f562d33e3bf51c6f10c80466e2 Mon Sep 17 00:00:00 2001
From: smf- <smf-@users.noreply.github.com>
Date: Tue, 21 May 2013 21:13:32 +0000
Subject: [PATCH] Ignore unformatted tracks in dsk files [smf]

---
 src/lib/formats/dsk_dsk.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/lib/formats/dsk_dsk.c b/src/lib/formats/dsk_dsk.c
index efa704d4787..8ef4946425c 100644
--- a/src/lib/formats/dsk_dsk.c
+++ b/src/lib/formats/dsk_dsk.c
@@ -370,8 +370,17 @@ bool dsk_format::load(io_generic *io, UINT32 form_factor, floppy_image *image)
 		int tmp = 0x100;
 		for (int i=0; i<tracks * heads; i++)
 		{
-			track_offsets[cnt] = tmp;
-			tmp += header[0x34 + i] << 8;
+			int length = header[0x34 + i] << 8;
+			if (length != 0)
+			{
+				track_offsets[cnt] = tmp;
+				tmp += length;
+			}
+			else
+			{
+				track_offsets[cnt] = image_size;
+			}
+
 			cnt += skip;
 		}
 	}