fix: Skip byte position from compressed files as it is not supported

Author: twpol

Source/Orts.Parsers.Msts/SBR.cs

@@ -522,18 +522,24 @@ public override void ThrowException(string message)
 
     public class SBRException : Exception
     {
+        static long GetPosition(BinaryBlockReader sbr)
+        {
+            if (sbr.InputStream.BaseStream is DeflateStream) return -1;
+            return sbr.InputStream.BaseStream.Position;
+        }
+
         public static void TraceWarning(BinaryBlockReader sbr, string message)
         {
-            Trace.TraceWarning("{2} in {0}:byte {1}", sbr.Filename, sbr.InputStream.BaseStream.Position, message);
+            Trace.TraceWarning("{2} in {0}:byte {1}", sbr.Filename, GetPosition(sbr), message);
         }
 
         public static void TraceInformation(BinaryBlockReader sbr, string message)
         {
-            Trace.TraceInformation("{2} in {0}:byte {1}", sbr.Filename, sbr.InputStream.BaseStream.Position, message);
+            Trace.TraceInformation("{2} in {0}:byte {1}", sbr.Filename, GetPosition(sbr), message);
         }
 
         public SBRException(BinaryBlockReader sbr, string message)
-            : base(String.Format("{2} in {0}:byte {1}\n", sbr.Filename, sbr.InputStream.BaseStream.Position, message))
+            : base(String.Format("{2} in {0}:byte {1}\n", sbr.Filename, GetPosition(sbr), message))
         {
         }
     }