1 files changed, 114 insertions, 0 deletions
diff --git a/trunk/avahi-sharp/Utility.cs b/trunk/avahi-sharp/Utility.cs
new file mode 100644
index 0000000..9081b01
--- /dev/null
+++ b/trunk/avahi-sharp/Utility.cs
@@ -0,0 +1,114 @@
+/* $Id$ */
+
+/***
+  This file is part of avahi.
+
+  avahi 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.
+
+  avahi 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 avahi; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+using System;
+using System.Net;
+using System.Text;
+using System.Runtime.InteropServices;
+using Mono.Unix;
+using Mono.Unix.Native;
+
+using Stdlib = Mono.Unix.Native.Stdlib;
+
+namespace Avahi
+{
+    internal class Utility
+    {
+        [DllImport ("libc")]
+        private static extern int strlen (IntPtr ptr);
+
+        [DllImport ("avahi-common")]
+        private static extern IntPtr avahi_address_snprint (IntPtr buf, int size, IntPtr address);
+
+        [DllImport ("avahi-common")]
+        private static extern IntPtr avahi_address_parse (IntPtr str, Protocol proto, IntPtr ret);
+
+        public static string PtrToString (IntPtr ptr)
+        {
+            if (ptr == IntPtr.Zero)
+                return null;
+            
+            int len = strlen (ptr);
+            byte[] bytes = new byte[len];
+            Marshal.Copy (ptr, bytes, 0, len);
+            return Encoding.UTF8.GetString (bytes);
+        }
+
+        public static string PtrToStringFree (IntPtr ptr)
+        {
+            if (ptr == IntPtr.Zero)
+                return null;
+            
+            string ret = PtrToString (ptr);
+            Free (ptr);
+            return ret;
+        }
+
+        public static byte[] StringToBytes (string str)
+        {
+            if (str == null)
+                return null;
+
+            return Encoding.UTF8.GetBytes (str + "\0"); // lame.
+        }
+
+        private static IntPtr StringToPtr (string str)
+        {
+            if (str == null)
+                return IntPtr.Zero;
+
+            byte[] bytes = Utility.StringToBytes (str);
+            IntPtr buf = Stdlib.malloc ((uint) bytes.Length + 1);
+            Marshal.Copy (bytes, 0, buf, bytes.Length);
+            Marshal.WriteByte (buf, bytes.Length, 0);
+            return buf;
+        }
+
+        public static void Free (IntPtr ptr)
+        {
+            Stdlib.free (ptr);
+        }
+
+        public static IntPtr AddressToPtr (IPAddress address)
+        {
+            IntPtr straddr = Utility.StringToPtr (address.ToString ());
+            IntPtr addrPtr = Stdlib.malloc (32);
+            avahi_address_parse (straddr, Protocol.Unspecified, addrPtr);
+            Utility.Free (straddr);
+
+            return addrPtr;
+        }
+
+        public static IPAddress PtrToAddress (IntPtr ptr)
+        {
+            IPAddress address = null;
+            
+            if (ptr != IntPtr.Zero) {
+                IntPtr buf = Stdlib.malloc (256);
+                IntPtr addrPtr = avahi_address_snprint (buf, 256, ptr);
+                address = IPAddress.Parse (Utility.PtrToString (addrPtr));
+                Utility.Free (addrPtr);
+            }
+
+            return address;
+        }
+    }
+}