IBinaryStream migration.

ArcFormats/ArcSPack.cs

@@ -108,7 +108,7 @@ namespace GameRes.Formats.SPack
                 using (var reader = new PackedReader (packed_entry, input))
                 {
                     reader.Unpack();
-                    return new MemoryStream (reader.Data);
+                    return new BinMemoryStream (reader.Data, entry.Name);
                 }
             }
             return input;