Fix TextBufferSerializeFunc signature

* generator/CallbackGen.cs: connect return value count parameters
* generator/ManagedCallString.cs: out count params aren't special
* generator/MethodBody.cs: don't finish hidden params
* generator/Parameters.cs: explicit IsCount setting support, with
    Parameters.GetCountParameter(name) interface. Clear IsCount
    values during validation if they have no associated array. Any
    remaining count params must be associated with a retval, so
    hide them.
* generator/ReturnValue.cs: support array_length_param attribute to
    associate a return value with a "count" param.  Use new helper
    methods to marshal these array retvals to IntPtr and back.
* glib/Marshaller.cs: support for byte[] marshaling to and from
    IntPtr using a count and type in the from native direction.
* gtk/Gtk.metadata: mark TextBufferSerializeFunc return type as
    an array with the length specific in the length param.

generator/CallbackGen.cs

@@ -54,6 +54,9 @@ namespace GtkSharp.Generation {
 				valid = false;
 			}
 
+			if (!String.IsNullOrEmpty (retval.CountParameterName))
+				retval.CountParameter = parms.GetCountParameter (retval.CountParameterName);
+
 			return valid;
 		}
 
@@ -218,6 +221,9 @@ namespace GtkSharp.Generation {
 			if (finish.Length > 0)
 				sw.WriteLine (finish);
 			sw.WriteLine ("\t\t\t\tif (release_on_call)\n\t\t\t\t\tgch.Free ();");
+			Parameter cnt = retval.CountParameter;
+			if (cnt != null)
+				sw.WriteLine ("\t\t\t\t{0} = {1}{2};", cnt.Name, cnt.CSType == "int" ? String.Empty : "(" + cnt.MarshalType + ")(" + cnt.CSType + ")", "__ret.Length");
 			if (retval.CSType != "void")
 				sw.WriteLine ("\t\t\t\treturn {0};", retval.ToNative ("__ret"));
 

generator/ManagedCallString.cs

@@ -43,7 +43,7 @@ namespace GtkSharp.Generation {
 					user_data_param = parms[i+1].Name;
 					destroy_param = parms[i+2].Name;
 					i += 2;
-				} else if (p.IsUserData && parms.IsHidden (p)) {
+				} else if ((p.IsCount || p.IsUserData) && parms.IsHidden (p)) {
 					user_data_param = p.Name;
 					continue;
 				} else if (p is ErrorParameter) {

generator/MethodBody.cs

@@ -140,10 +140,13 @@ namespace GtkSharp.Generation {
 
 		public void Finish (StreamWriter sw, string indent)
 		{
-			foreach (Parameter p in parameters)
+			foreach (Parameter p in parameters) {
+				if (parameters.IsHidden (p))
+					continue;
 				foreach (string s in p.Finish)
 					sw.WriteLine(indent + "\t\t\t" + s);
 			}
+		}
 
 		public void FinishAccessor (StreamWriter sw, Signature sig, string indent)
 		{

generator/Parameters.cs

@@ -91,8 +91,12 @@ namespace GtkSharp.Generation {
 			}
 		}
 
+		bool is_count;
+		bool is_count_set;
 		public bool IsCount {
 			get {
+				if (is_count_set)
+					return is_count;
 				
 				if (Name.StartsWith("n_"))
 					switch (CSType) {
@@ -109,6 +113,10 @@ namespace GtkSharp.Generation {
 				else
 					return false;
 			}
+			set {
+				is_count_set = true;
+				is_count = value;
+			}
 		}
 
 		public bool IsDestroyNotify {
@@ -119,7 +127,6 @@ namespace GtkSharp.Generation {
 
 		public bool IsLength {
 			get {
-				
 				if (Name.EndsWith("len") || Name.EndsWith("length"))
 					switch (CSType) {
 					case "int":
@@ -529,9 +536,7 @@ namespace GtkSharp.Generation {
 		}
 
 		public int Count {
-			get {
-				return param_list.Count;
-			}
+			get { return param_list.Count; }
 		}
 
 		public int VisibleCount {
@@ -558,8 +563,7 @@ namespace GtkSharp.Generation {
 			if (idx > 0 && p.IsLength && p.PassAs == String.Empty && this [idx - 1].IsString)
 				return true;
 
-			if (p.IsCount && ((idx > 0 && this [idx - 1].IsArray) ||
-					  (idx < Count - 1 && this [idx + 1].IsArray)))
+			if (p.IsCount)
 				return true;
 
 			if (p.CType == "GError**")
@@ -608,6 +612,16 @@ namespace GtkSharp.Generation {
 			set { is_static = value; }
 		}
 
+		public Parameter GetCountParameter (string param_name)
+		{
+			foreach (Parameter p in this)
+				if (p.Name == param_name) {
+					p.IsCount = true;
+					return p;
+				}
+			return null;
+		}
+
 		void Clear ()
 		{
 			elem = null;
@@ -663,7 +677,9 @@ namespace GtkSharp.Generation {
 							} 
 						}
 					}
-				} else if (p.IsCount && i < elem.ChildNodes.Count - 1) {
+				} else if (p.IsCount) {
+					p.IsCount = false;
+					if (i < elem.ChildNodes.Count - 1) {
 						XmlElement next = elem.ChildNodes [i + 1] as XmlElement;
 						if (next != null || next.Name == "parameter") {
 							Parameter a = new Parameter (next);
@@ -672,6 +688,7 @@ namespace GtkSharp.Generation {
 								i++;
 							}
 						}
+					}
 				} else if (p.CType == "GError**")
 					p = new ErrorParameter (parm);
 				else if (gen is StructBase || gen is ByRefGen) {

generator/ReturnValue.cs

@@ -31,15 +31,18 @@ namespace GtkSharp.Generation {
 		bool is_array;
 		bool elements_owned;
 		bool owned;
+		string array_length_param = String.Empty;
 		string ctype = String.Empty;
 		string default_value = String.Empty;
 		string element_ctype = String.Empty;
+		Parameter count_param;
 
 		public ReturnValue (XmlElement elem) 
 		{
 			if (elem != null) {
 				is_null_term = elem.HasAttribute ("null_term_array");
-				is_array = elem.HasAttribute ("array");
+				is_array = elem.HasAttribute ("array") || elem.HasAttribute ("array_length_param");
+				array_length_param = elem.GetAttribute ("array_length_param");
 				elements_owned = elem.GetAttribute ("elements_owned") == "true";
 				owned = elem.GetAttribute ("owned") == "true";
 				ctype = elem.GetAttribute("type");
@@ -48,6 +51,15 @@ namespace GtkSharp.Generation {
 			}
 		}
 
+		public Parameter CountParameter {
+			get { return count_param; }
+			set { count_param = value; }
+		}
+
+		public string CountParameterName {
+			get { return array_length_param; }
+		}
+
 		public string CType {
 			get {
 				return ctype;
@@ -104,9 +116,9 @@ namespace GtkSharp.Generation {
 			get {
 				if (IGen == null)
 					return String.Empty;
-				else if (is_null_term)
+				else if (is_array || is_null_term)
 					return "IntPtr";
-				return IGen.MarshalType + (is_array ? "[]" : String.Empty);
+				return IGen.MarshalType;
 			}
 		}
 
@@ -133,6 +145,8 @@ namespace GtkSharp.Generation {
 				return ((IOwnable)IGen).FromNative (var, owned);
 			else if (is_null_term)
 				return String.Format ("GLib.Marshaller.NullTermPtrToStringArray ({0}, {1})", var, owned ? "true" : "false");
+			else if (is_array)
+				return String.Format ("({0}) GLib.Marshaller.ArrayPtrToArray ({1}, typeof ({2}), (int){3}native_{4}, true)", CSType, var, IGen.QualifiedName, CountParameter.CSType == "int" ? String.Empty : "(" + CountParameter.CSType + ")", CountParameter.Name);
 			else
 				return IGen.FromNative (var);
 		}
@@ -147,6 +161,8 @@ namespace GtkSharp.Generation {
 				var = "new " + IGen.QualifiedName + "(" + var + args + ")";
 			} else if (is_null_term)
 				return String.Format ("GLib.Marshaller.StringArrayToNullTermPointer ({0})", var);
+			else if (is_array)
+				return String.Format ("GLib.Marshaller.ArrayToArrayPtr ({0})", var);
 
 			if (IGen is IManualMarshaler)
 				return (IGen as IManualMarshaler).AllocNative (var);

glib/Marshaller.cs

@@ -402,6 +402,28 @@ namespace GLib {
 			return result;
 		}
 
+		public static IntPtr ArrayToArrayPtr (byte[] array)
+		{
+			IntPtr ret = Malloc ((ulong) array.Length);
+			Marshal.Copy (array, 0, ret, array.Length);
+			return ret;
+		}
+
+		public static Array ArrayPtrToArray (IntPtr array_ptr, Type element_type, int length, bool owned)
+		{
+			Array result = null;
+			if (element_type == typeof (byte)) {
+				byte[] ret = new byte [length];
+				Marshal.Copy (array_ptr, ret, 0, length);
+				result = ret;
+			} else {
+				throw new InvalidOperationException ("Marshaling of " + element_type + " arrays is not supported");
+			}
+			if (owned)
+				Free (array_ptr);
+			return result;
+		}
+
 		public static Array ListPtrToArray (IntPtr list_ptr, Type list_type, bool owned, bool elements_owned, Type elem_type)
 		{
 			Type array_type = elem_type == typeof (ListBase.FilenameString) ? typeof (string) : elem_type;

gtk/Gtk.metadata

@@ -50,6 +50,7 @@
   <attr path="/api/namespace/boxed[@cname='GtkTreeRowReference']/method[@name='Free']" name="deprecated">1</attr>
   <attr path="/api/namespace/boxed[@cname='GtkTreeRowReference']/method[@name='GetPath']/return-type" name="owned">true</attr>
   <attr path="/api/namespace/callback[@cname='GtkClipboardRichTextReceivedFunc']" name="hidden">1</attr>
+  <attr path="/api/namespace/callback[@cname='GtkTextBufferSerializeFunc']/return-type" name="array_length_param">length</attr>
   <attr path="/api/namespace/callback[@cname='GtkTextBufferDeserializeFunc']/*/*[@name='data']" name="array">1</attr>
 <attr path="/api/namespace/callback[@cname='GtkTreeModelFilterModifyFunc']/parameters/parameter[@name='value']" name="pass_as">ref</attr>
   <attr path="/api/namespace/callback[@cname='GtkModuleDisplayInitFunc']" name="hidden">1</attr>