[SonyPFS] Implemented readlink.

Aaru.Filesystems/SonyPFS/File.cs

@@ -30,6 +30,8 @@ using System;
 using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
 using Aaru.CommonTypes.Enums;
 using Aaru.CommonTypes.Interfaces;
 using Aaru.CommonTypes.Structs;
@@ -219,6 +221,49 @@ public partial class SonyPFS
         return ErrorNumber.NoError;
     }
 
+    /// <inheritdoc />
+    public ErrorNumber ReadLink(string path, out string dest)
+    {
+        dest = null;
+
+        if(!_mounted) return ErrorNumber.AccessDenied;
+
+        ErrorNumber err = GetFileEntry(path, out DirEntry entry);
+
+        if(err != ErrorNumber.NoError) return err;
+
+        err = ReadInode(entry.Inode, entry.SubPart, out Inode inode);
+
+        if(err != ErrorNumber.NoError) return err;
+
+        if((inode.mode & (ushort)FileType.IFMT) != (ushort)FileType.IFLNK) return ErrorNumber.InvalidArgument;
+
+        // Symlink target is stored as raw bytes starting at data[1] in the inode
+        // data[0] is the inode's own block; data[1..] onward contains the path string
+        // Reinterpret data[1..] as bytes
+        int blockInfoSize  = Marshal.SizeOf<BlockInfo>();
+        int maxStringBytes = (PFS_INODE_MAX_BLOCKS - 1) * blockInfoSize;
+        var linkBytes      = new byte[maxStringBytes];
+
+        for(var i = 1; i < inode.data.Length; i++)
+        {
+            int offset = (i - 1) * blockInfoSize;
+
+            byte[] biBytes = Helpers.Marshal.StructureToByteArrayLittleEndian(inode.data[i]);
+
+            Array.Copy(biBytes, 0, linkBytes, offset, blockInfoSize);
+        }
+
+        // Find null terminator
+        int len = Array.IndexOf(linkBytes, (byte)0);
+
+        if(len < 0) len = maxStringBytes;
+
+        dest = Encoding.ASCII.GetString(linkBytes, 0, len);
+
+        return ErrorNumber.NoError;
+    }
+
     /// <summary>Resolves a path to a DirEntry by walking the directory tree.</summary>
     ErrorNumber GetFileEntry(string path, out DirEntry entry)
     {

Aaru.Filesystems/SonyPFS/Unimplemented.cs

@@ -1,38 +0,0 @@
-// /***************************************************************************
-// Aaru Data Preservation Suite
-// ----------------------------------------------------------------------------
-//
-// Filename       : Unimplemented.cs
-// Author(s)      : Natalia Portillo <claunia@claunia.com>
-//
-// Component      : PlayStation FileSystem 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 Aaru.CommonTypes.Enums;
-
-namespace Aaru.Filesystems;
-
-public partial class SonyPFS
-{
-    /// <inheritdoc />
-    public ErrorNumber ReadLink(string path, out string dest) => throw new NotImplementedException();
-}