1 files changed, 149 insertions, 0 deletions
diff --git a/gstreamer-sharp/glib-sharp/ManagedValue.cs b/gstreamer-sharp/glib-sharp/ManagedValue.cs
new file mode 100644
index 0000000..19ac3a2
--- /dev/null
+++ b/gstreamer-sharp/glib-sharp/ManagedValue.cs
@@ -0,0 +1,149 @@
+// GLib.ManagedValue.cs : Managed types boxer
+//
+// Author: Rachel Hestilow <hestilow@ximian.com>
+//
+// Copyright (c) 2002 Rachel Hestilow
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of version 2 of the Lesser GNU General 
+// Public License as published by the Free Software Foundation.
+//
+// This program 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 program; if not, write to the
+// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+// Boston, MA 02111-1307, USA.
+
+
+namespace GLib {
+	using System;
+	using System.Collections;
+	using System.Runtime.InteropServices;
+	using GLib;
+	
+	internal class ManagedValue {
+
+		GCHandle gch;
+		object instance;
+		int ref_count = 1;
+		
+		private ManagedValue (object instance)
+		{
+			this.instance = instance;
+			gch = GCHandle.Alloc (this);
+		}
+
+		IntPtr Handle {
+			get { return (IntPtr) gch; }
+		}
+
+		object Instance {
+			get { return instance; }
+		}
+
+		void Ref ()
+		{
+			ref_count++;
+		}
+
+		void Unref ()
+		{
+			if (--ref_count == 0) {
+				instance = null;
+				gch.Free ();
+			}
+		}
+
+		[UnmanagedFunctionPointer (CallingConvention.Cdecl)]
+		delegate IntPtr CopyFunc (IntPtr gch);
+		[UnmanagedFunctionPointer (CallingConvention.Cdecl)]
+		delegate void FreeFunc (IntPtr gch);
+		
+		static CopyFunc copy;
+		static FreeFunc free;
+		static GType boxed_type = GType.Invalid;
+
+		[DllImport("libgobject-2.0-0.dll")]
+		static extern IntPtr g_boxed_type_register_static (IntPtr typename, CopyFunc copy_func, FreeFunc free_func);
+		
+		public static GType GType {
+			get {
+				if (boxed_type == GType.Invalid) {
+					copy = new CopyFunc (Copy);
+					free = new FreeFunc (Free);
+				
+					IntPtr name = Marshaller.StringToPtrGStrdup ("GtkSharpValue");
+					boxed_type = new GLib.GType (g_boxed_type_register_static (name, copy, free));
+					Marshaller.Free (name);
+				}
+
+				return boxed_type;
+			}
+		}
+		
+		static ManagedValue FromHandle (IntPtr ptr)
+		{
+			GCHandle gch = (GCHandle) ptr;
+			ManagedValue val = gch.Target as ManagedValue;
+			if (val == null)
+				throw new Exception ("Unexpected GCHandle received.");
+			return val;
+		}
+
+		static IntPtr Copy (IntPtr ptr)
+		{
+			try {
+				if (ptr == IntPtr.Zero)
+					return ptr;
+				ManagedValue val = FromHandle (ptr);
+				val.Ref ();
+				return ptr;
+			} catch (Exception e) {
+				ExceptionManager.RaiseUnhandledException (e, false);
+			}
+
+			return IntPtr.Zero;
+		}
+
+		static void Free (IntPtr ptr)
+		{
+			try {
+				if (ptr == IntPtr.Zero)
+					return;
+				ManagedValue val = FromHandle (ptr);
+				val.Unref ();
+			} catch (Exception e) {
+				ExceptionManager.RaiseUnhandledException (e, false);
+			}
+		}
+
+		public static IntPtr WrapObject (object obj)
+		{
+			if (obj == null)
+				return IntPtr.Zero;
+			return new ManagedValue (obj).Handle;
+		}
+
+		public static object ObjectForWrapper (IntPtr ptr)
+		{
+			if (ptr == IntPtr.Zero)
+				return null;
+			ManagedValue val = FromHandle (ptr);
+			return val == null ? null : val.Instance;
+		}
+
+		public static void ReleaseWrapper (IntPtr ptr)
+		{
+			if (ptr == IntPtr.Zero)
+				return;
+
+			ManagedValue val = FromHandle (ptr);
+			val.Unref ();
+		}
+	}
+}
+