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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
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
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)
{ (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;