[Archive interface] Indicate that archive features can change with an opened archive.

Aaru.Archives/Symbian/Open.cs

@@ -32,6 +32,7 @@
 
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using System.Text;
 using Aaru.CommonTypes.Enums;
 using Aaru.CommonTypes.Interfaces;
@@ -160,6 +161,12 @@ public sealed partial class Symbian
 
         _files = filesWithFixedFilenames;
 
+        _features = ArchiveSupportedFeature.SupportsFilenames | ArchiveSupportedFeature.SupportsSubdirectories;
+        if(_release6 && !sh.options.HasFlag(SymbianOptions.NoCompress))
+            _features |= ArchiveSupportedFeature.SupportsCompression;
+        if(_files.Any(t => t.mime is not null))
+            _features |= ArchiveSupportedFeature.SupportsXAttrs;
+
         return ErrorNumber.NoError;
     }
 

Aaru.Archives/Symbian/Symbian.cs

@@ -43,6 +43,7 @@ public sealed partial class Symbian : IArchive
 {
     const string            MODULE_NAME = "Symbian Installation File Plugin";
     Encoding                _encoding;
+    ArchiveSupportedFeature _features;
     List<DecodedFileRecord> _files;
     bool                    _opened;
     bool                    _release6;
@@ -56,9 +57,13 @@ public sealed partial class Symbian : IArchive
     public Guid   Id   => new("0EC84EC7-EAE6-4196-83FE-943B3FE48DBD");
 
     /// <inheritdoc />
-    public ArchiveSupportedFeature GetArchiveFeatures() => ArchiveSupportedFeature.SupportsFilenames   |
+    public ArchiveSupportedFeature GetArchiveFeatures() =>
+        !_opened
+            ? ArchiveSupportedFeature.SupportsFilenames      |
               ArchiveSupportedFeature.SupportsCompression    |
-                                                           ArchiveSupportedFeature.SupportsSubdirectories;
+              ArchiveSupportedFeature.SupportsSubdirectories |
+              ArchiveSupportedFeature.SupportsXAttrs
+            : _features;
 
 #endregion
 }