From ab4b849175381e2b35f4fa581aea7649585034b6 Mon Sep 17 00:00:00 2001
From: Natalia Portillo <claunia@claunia.com>
Date: Fri, 3 Jan 2020 15:00:25 +0000
Subject: [PATCH] Fix infinite loop on pregap calculation when subchannel is
 empty.

---
 DiscImageChef.Core/Devices/Dumping/CompactDisc/Pregap.cs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/DiscImageChef.Core/Devices/Dumping/CompactDisc/Pregap.cs b/DiscImageChef.Core/Devices/Dumping/CompactDisc/Pregap.cs
index 2fc2a9bf2..9aecd9c47 100644
--- a/DiscImageChef.Core/Devices/Dumping/CompactDisc/Pregap.cs
+++ b/DiscImageChef.Core/Devices/Dumping/CompactDisc/Pregap.cs
@@ -177,7 +177,10 @@ namespace DiscImageChef.Core.Devices.Dumping
                     {
                         // Q position
                         if((cmdBuf[0] & 0xF) != 1)
+                        {
+                            lba--;
                             continue;
+                        }
 
                         // Check if BCD or binary values, change to binary
                         int posQ = ((cmdBuf[7] * 60 * 75) + (cmdBuf[8] * 75) + cmdBuf[9]) - 150;