[GDFX] Implement directory operations

Aaru.Filesystems/GDFX/Dir.cs

@@ -27,10 +27,11 @@
 // ****************************************************************************/
 
 using System.Collections.Generic;
+using System.Linq;
 using Aaru.CommonTypes.Enums;
 using Aaru.CommonTypes.Interfaces;
-using Aaru.Helpers;
 using Aaru.Logging;
+using Marshal = Aaru.Helpers.Marshal;
 
 namespace Aaru.Filesystems;
 
@@ -41,18 +42,48 @@ public sealed partial class GDFX
     {
         node = null;
 
-        return ErrorNumber.NotImplemented;
+        if(!_mounted) return ErrorNumber.AccessDenied;
+
+        string normalizedPath = string.IsNullOrEmpty(path)
+                                    ? "/"
+                                    : path.StartsWith('/')
+                                        ? path
+                                        : "/" + path;
+
+        if(!_directoryCache.TryGetValue(normalizedPath, out List<DecodedEntry> entries)) return ErrorNumber.NoSuchFile;
+
+        node = new GdfxDirNode
+        {
+            Path     = normalizedPath,
+            Contents = entries.Select(e => e.Name).ToArray(),
+            Position = 0
+        };
+
+        return ErrorNumber.NoError;
     }
 
     /// <inheritdoc />
-    public ErrorNumber CloseDir(IDirNode node) => ErrorNumber.NotImplemented;
+    public ErrorNumber CloseDir(IDirNode node)
+    {
+        if(node is not GdfxDirNode) return ErrorNumber.InvalidArgument;
+
+        return ErrorNumber.NoError;
+    }
 
     /// <inheritdoc />
     public ErrorNumber ReadDir(IDirNode node, out string filename)
     {
         filename = null;
 
-        return ErrorNumber.NotImplemented;
+        if(!_mounted) return ErrorNumber.AccessDenied;
+
+        if(node is not GdfxDirNode dirNode) return ErrorNumber.InvalidArgument;
+
+        if(dirNode.Position >= dirNode.Contents.Length) return ErrorNumber.NoError;
+
+        filename = dirNode.Contents[dirNode.Position++];
+
+        return ErrorNumber.NoError;
     }
 
     /// <summary>

Aaru.Filesystems/GDFX/File.cs

@@ -27,7 +27,6 @@
 // ****************************************************************************/
 
 using System;
-using System.Collections.Generic;
 using Aaru.CommonTypes.Enums;
 using Aaru.CommonTypes.Interfaces;
 using Aaru.CommonTypes.Structs;
@@ -155,30 +154,4 @@ public sealed partial class GDFX
 
         return ErrorNumber.NoError;
     }
-
-    /// <summary>Resolves a path string to a directory entry in the cache.</summary>
-    ErrorNumber ResolveEntry(string path, out DecodedEntry entry)
-    {
-        entry = null;
-
-        string[] parts = path.Split(['/'], StringSplitOptions.RemoveEmptyEntries);
-
-        if(parts.Length == 0) return ErrorNumber.InvalidArgument;
-
-        string dirPath  = parts.Length == 1 ? "/" : "/" + string.Join("/", parts[..^1]);
-        string fileName = parts[^1];
-
-        if(!_directoryCache.TryGetValue(dirPath, out List<DecodedEntry> dirEntries)) return ErrorNumber.NoSuchFile;
-
-        foreach(DecodedEntry e in dirEntries)
-        {
-            if(!string.Equals(e.Name, fileName, StringComparison.OrdinalIgnoreCase)) continue;
-
-            entry = e;
-
-            return ErrorNumber.NoError;
-        }
-
-        return ErrorNumber.NoSuchFile;
-    }
 }

Aaru.Filesystems/GDFX/Helpers.cs

@@ -0,0 +1,62 @@
+// /***************************************************************************
+// Aaru Data Preservation Suite
+// ----------------------------------------------------------------------------
+//
+// Filename       : Helpers.cs
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//
+// Component      : Microsoft Xbox DVD File System plugin.
+//
+// --[ License ] --------------------------------------------------------------
+//
+//     This library is free software; you can redistribute it and/or modify
+//     it under the terms of the GNU Lesser General Public License as
+//     published by the Free Software Foundation; either version 2.1 of the
+//     License, or (at your option) any later version.
+//
+//     This library is distributed in the hope that it will be useful, but
+//     WITHOUT ANY WARRANTY; without even the implied warranty of
+//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+//     Lesser General Public License for more details.
+//
+//     You should have received a copy of the GNU Lesser General Public
+//     License along with this library; if not, see <http://www.gnu.org/licenses/>.
+//
+// ----------------------------------------------------------------------------
+// Copyright © 2011-2026 Natalia Portillo
+// ****************************************************************************/
+
+using System;
+using System.Collections.Generic;
+using Aaru.CommonTypes.Enums;
+
+namespace Aaru.Filesystems;
+
+public sealed partial class GDFX
+{
+    /// <summary>Resolves a path string to a directory entry in the cache.</summary>
+    ErrorNumber ResolveEntry(string path, out DecodedEntry entry)
+    {
+        entry = null;
+
+        string[] parts = path.Split(['/'], StringSplitOptions.RemoveEmptyEntries);
+
+        if(parts.Length == 0) return ErrorNumber.InvalidArgument;
+
+        string dirPath  = parts.Length == 1 ? "/" : "/" + string.Join("/", parts[..^1]);
+        string fileName = parts[^1];
+
+        if(!_directoryCache.TryGetValue(dirPath, out List<DecodedEntry> dirEntries)) return ErrorNumber.NoSuchFile;
+
+        foreach(DecodedEntry e in dirEntries)
+        {
+            if(!string.Equals(e.Name, fileName, StringComparison.OrdinalIgnoreCase)) continue;
+
+            entry = e;
+
+            return ErrorNumber.NoError;
+        }
+
+        return ErrorNumber.NoSuchFile;
+    }
+}