PROMS/Volian.Controls.Library/StepTabRibbon.cs

@@ -916,9 +916,33 @@ namespace Volian.Controls.Library
 			string rofstPath = rdi.FolderPath + @"\ro.fst";
 			if (!File.Exists(rofstPath)) return false;
 			FileInfo fiRofst = new FileInfo(rofstPath);
-			if (roFstInfo.DTS == fiRofst.LastWriteTime) return false;
-			if (roFstInfo.DTS > fiRofst.LastWriteTime) return false;
-			return true;
+
+			// if the database Ro.Fst is newer or if the files have identical DTS, 
+			// assume that they are the same file.
+			if (roFstInfo.DTS >= fiRofst.LastWriteTime) return false;
+
+			// next see if the data is the same size, i.e. byte count of record and byte count
+			// of file.  If different sizes, the date/time stamp check will hold.
+			if (fiRofst.Length != roFstInfo.ROLookup.Length) return fiRofst.LastWriteTime > roFstInfo.DTS;
+
+			// if we can't tell by the DTS or size, compare the contents.  Get all of the rodb's
+			// rofsts of the size of the file & compare bytes. If 
+			ROFstInfoList fstList = ROFstInfoList.GetBySize(rdi.RODbID, (int)fiRofst.Length);
+			if (fstList.Count > 0)
+			{
+				FileStream fsIn = new FileStream(rofstPath, FileMode.Open, FileAccess.Read, FileShare.Read);
+				// Create an instance of StreamReader that can read characters from the FileStream.
+				BinaryReader r = new BinaryReader(fsIn);
+				byte[] ab = r.ReadBytes((int)fsIn.Length);
+				fsIn.Close();
+				foreach (ROFstInfo irofst in fstList)
+				{
+					// compare contents by comparing each byte.
+					for (int i = 0; i < fiRofst.Length; i++)
+						if (ab[i] != irofst.ROLookup[i]) return true;
+				}
+			}
+			return false;
 		}
 		public void SetUpdRoValBtn(bool en)
 		{