[AaruFormat] Implement Close.

Aaru.Images/AaruFormat/AaruFormat.cs

@@ -6,7 +6,7 @@ namespace Aaru.Images;
 
 /// <inheritdoc cref="Aaru.CommonTypes.Interfaces.IWritableOpticalImage" />
 /// <summary>Implements reading and writing AaruFormat media images</summary>
-public sealed partial class AaruFormat : IWritableOpticalImage, IVerifiableImage, IWritableTapeImage
+public sealed partial class AaruFormat : IWritableOpticalImage, IVerifiableImage, IWritableTapeImage, IDisposable
 {
     const string MODULE_NAME = "Aaru Format plugin";
 

Aaru.Images/AaruFormat/Close.cs

@@ -0,0 +1,55 @@
+using System;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+namespace Aaru.Images;
+
+public sealed partial class AaruFormat
+{
+#region IDisposable Members
+
+    /// <inheritdoc />
+    public void Dispose()
+    {
+        ReleaseUnmanagedResources();
+        GC.SuppressFinalize(this);
+    }
+
+#endregion
+
+#region IWritableOpticalImage Members
+
+    /// <inheritdoc />
+    public bool Close()
+    {
+        if(_context == IntPtr.Zero) return false;
+
+        int res = aaruf_close(_context);
+
+        _context = IntPtr.Zero;
+
+        return res == 0;
+    }
+
+#endregion
+
+    void ReleaseUnmanagedResources()
+    {
+        if(_context == IntPtr.Zero) return;
+
+        aaruf_close(_context);
+
+        _context = IntPtr.Zero;
+    }
+
+    /// <inheritdoc />
+    ~AaruFormat()
+    {
+        ReleaseUnmanagedResources();
+    }
+
+    // AARU_EXPORT int AARU_CALL aaruf_close(void *context)
+    [LibraryImport("libaaruformat", EntryPoint = "aaruf_close", SetLastError = true)]
+    [UnmanagedCallConv(CallConvs = [typeof(CallConvStdcall)])]
+    private static partial int aaruf_close(IntPtr context);
+}

Aaru.Images/AaruFormat/Unimplemented.cs

@@ -50,9 +50,6 @@ public sealed partial class AaruFormat
     public bool Create(string path, MediaType mediaType, Dictionary<string, string> options, ulong sectors,
                        uint   sectorSize) => throw new NotImplementedException();
 
-    /// <inheritdoc />
-    public bool Close() => throw new NotImplementedException();
-
     /// <inheritdoc />
     public bool SetMetadata(Metadata metadata) => throw new NotImplementedException();