Add checks for malformed png data

MultipleMaids/SaveManager.cs

@@ -285,10 +285,12 @@ namespace CM3D2.MultipleMaids.Plugin
         private void ReadScene()
         {
             string filePath = scenes[selectedScene].info.FullName;
+
+            sceneData = null;
+
             if (!File.Exists(filePath))
             {
                 RefreshSceneManager();
-                sceneData = null;
                 return;
             }
 
@@ -301,7 +303,7 @@ namespace CM3D2.MultipleMaids.Plugin
                 {
                     if (pos < 0)
                     {
-                        sceneData = null;
+                        Util.Logger.Log(LogLevel.Error, $"Could not read '{Path.GetFileName(filePath)}'");
                         return;
                     }
 
@@ -314,7 +316,7 @@ namespace CM3D2.MultipleMaids.Plugin
                 }
                 fileStream.Position += 4;
 
-                byte[] kankyo = new byte[6];
+                byte[] kankyo = new byte[kankyoHeader.Length];
                 fileStream.Read(kankyo, 0, kankyo.Length);
 
                 if (BytesEqual(kankyo, kankyoHeader))
@@ -324,13 +326,19 @@ namespace CM3D2.MultipleMaids.Plugin
                 else
                 {
                     kankyoScene = false;
-                    fileStream.Position -= 6;
+                    fileStream.Position -= kankyoHeader.Length;
                 }
 
-                using (MemoryStream sceneStream = LZMA.Decompress(fileStream))
+                try
+                {
+                    using (var sceneStream = LZMA.Decompress(fileStream))
+                    {
+                        sceneData = Encoding.Unicode.GetString(sceneStream.ToArray());
+                    }
+                }
+                catch (Exception e)
                 {
-                    sceneData = Encoding.Unicode.GetString(sceneStream.ToArray());
-                    return;
+                    Util.Logger.Log(LogLevel.Error, $"Failed to decompress scene data because '{e}'\n");
                 }
             }
         }