fixed games handling

AssetStudio/OffsetStream.cs

@@ -8,7 +8,6 @@ namespace AssetStudio
 {
     public class OffsetStream : Stream
     {
-
         private readonly Stream _baseStream;
         private long _offset;
 
@@ -81,13 +80,26 @@ namespace AssetStudio
             else
             {
                 using var reader = new FileReader(path, this, true);
-                var signature = reader.FileType switch
+
+                var readSignature = reader.FileType;
+                var signature = "";
+
+                if (readSignature == FileType.BundleFile ||
+                    readSignature == FileType.MhyFile ||
+                    readSignature == FileType.Blb3File)
                 {
-                    FileType.BundleFile => "UnityFS\x00",
-                    FileType.MhyFile => "mhy",
-                    FileType.Blb3File => "Blb\x03",
-                    _ => throw new InvalidOperationException()
-                };
+                    switch (reader.FileType)
+                    {
+                        case FileType.BundleFile:
+                            signature = "UnityFS\x00";
+                            break;
+                        case FileType.MhyFile:
+                            signature = "mhy";
+                            break;
+                        case FileType.Blb3File:
+                            signature = "Blb\x03";
+                            break;
+                    }
 
                     Logger.Verbose($"Parsed signature: {signature}");
 
@@ -109,6 +121,18 @@ namespace AssetStudio
                         }
                     }
                     ArrayPool<byte>.Shared.Return(buffer);
+                } else
+                {
+                    while (Remaining > 0)
+                    {
+                        Offset = AbsolutePosition;
+                        yield return AbsolutePosition;
+                        if (Offset == AbsolutePosition)
+                        {
+                            break;
+                        }
+                    }
+                }
             }
         }
     }