112 lines
3.3 KiB
C#
112 lines
3.3 KiB
C#
/***
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This file is part of avahi.
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avahi is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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avahi is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with avahi; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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using System;
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using System.Net;
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using System.Text;
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using System.Runtime.InteropServices;
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using Mono.Unix;
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using Mono.Unix.Native;
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using Stdlib = Mono.Unix.Native.Stdlib;
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namespace Avahi
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{
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internal class Utility
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{
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[DllImport ("libc")]
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private static extern int strlen (IntPtr ptr);
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[DllImport ("avahi-common")]
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private static extern IntPtr avahi_address_snprint (IntPtr buf, int size, IntPtr address);
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[DllImport ("avahi-common")]
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private static extern IntPtr avahi_address_parse (IntPtr str, Protocol proto, IntPtr ret);
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public static string PtrToString (IntPtr ptr)
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{
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if (ptr == IntPtr.Zero)
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return null;
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int len = strlen (ptr);
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byte[] bytes = new byte[len];
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Marshal.Copy (ptr, bytes, 0, len);
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return Encoding.UTF8.GetString (bytes);
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}
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public static string PtrToStringFree (IntPtr ptr)
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{
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if (ptr == IntPtr.Zero)
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return null;
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string ret = PtrToString (ptr);
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Free (ptr);
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return ret;
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}
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public static byte[] StringToBytes (string str)
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{
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if (str == null)
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return null;
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return Encoding.UTF8.GetBytes (str + "\0"); // lame.
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}
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private static IntPtr StringToPtr (string str)
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{
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if (str == null)
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return IntPtr.Zero;
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byte[] bytes = Utility.StringToBytes (str);
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IntPtr buf = Stdlib.malloc ((uint) bytes.Length + 1);
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Marshal.Copy (bytes, 0, buf, bytes.Length);
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Marshal.WriteByte (buf, bytes.Length, 0);
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return buf;
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}
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public static void Free (IntPtr ptr)
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{
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Stdlib.free (ptr);
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}
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public static IntPtr AddressToPtr (IPAddress address)
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{
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IntPtr straddr = Utility.StringToPtr (address.ToString ());
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IntPtr addrPtr = Stdlib.malloc (32);
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avahi_address_parse (straddr, Protocol.Unspecified, addrPtr);
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Utility.Free (straddr);
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return addrPtr;
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}
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public static IPAddress PtrToAddress (IntPtr ptr)
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{
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IPAddress address = null;
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if (ptr != IntPtr.Zero) {
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IntPtr buf = Stdlib.malloc (256);
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IntPtr addrPtr = avahi_address_snprint (buf, 256, ptr);
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address = IPAddress.Parse (Utility.PtrToString (addrPtr));
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Utility.Free (addrPtr);
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}
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return address;
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}
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}
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}
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