Fixed Crash from Issue #1

Now if the associated directory is not present for an ACF file, it will
report size 0, and will no longer crash when trying to copy, but the
copy will still fail.

GamePipeLib/Model/Steam/SteamApp.cs

@@ -42,6 +42,7 @@ public enum AppStateFlags
     public class SteamApp : GamePipeLib.Model.NotifyPropertyChangedBase, ISteamApplication
     {
         private System.IO.FileSystemWatcher _watcher;
+        private long _acfDiskSize;
         public SteamApp(string acfFilePath)
         {
             _AcfFile = acfFilePath;
@@ -56,8 +57,13 @@ public void MeasureDiskSize()
         {
             if (!_isMeasured)
             {
-                var info = new DirectoryInfo(GameDir);
-                DiskSize = info.EnumerateFiles("*", SearchOption.AllDirectories).Sum(x => x.Length);
+                if (Directory.Exists(GameDir))
+                {
+                    var info = new DirectoryInfo(GameDir);
+                    DiskSize = info.EnumerateFiles("*", SearchOption.AllDirectories).Sum(x => x.Length);
+                }
+                else
+                    DiskSize = 0;
                 _isMeasured = true;
             }
         }
@@ -134,7 +140,12 @@ public void InitializeFromAcf()
             int count = 0;
             foreach (var pair in pairs)
             {
-                if (count >= 5) return;  //return once we've got what we're looking for
+                if (count >= 5)
+                {
+                    if (!Directory.Exists(GameDir))
+                        DiskSize = 0;
+                    return;  //return once we've got what we're looking for
+                }
                 switch (pair.Item1.ToLower())   //Compare in lower case
                 {
                     case "appid":
@@ -147,6 +158,7 @@ public void InitializeFromAcf()
                         break;
                     case "sizeondisk":
                         DiskSize = long.Parse(pair.Item2);
+                        _acfDiskSize = DiskSize;
                         count++;
                         break;
                     case "name":
@@ -187,7 +199,13 @@ public void RefreshFromAcf()
                         count++;
                         break;
                     case "sizeondisk":
-                        DiskSize = long.Parse(pair.Item2);
+                        var newDiskSize = long.Parse(pair.Item2);
+                        if (newDiskSize != _acfDiskSize)
+                        {
+                            DiskSize = newDiskSize;
+                            _acfDiskSize = DiskSize;
+                            _isMeasured = false;
+                        }
                         count++;
                         break;
                 }