src/protocols/icq/icqbyteorder.h

   1 /*
   2  * $Id: icqbyteorder.h 2096 2001-07-31 01:00:39Z warmenhoven $
   3  *
   4  * This header defines macros to handle ICQ protocol byte order conversion.
   5  *
   6  * Vadim Zaliva <lord@crocodile.org>
   7  * http://www.crocodile.org/
   8  *
   9  * Copyright (C) 1999 Vadim Zaliva
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  *
  25  */
  26
  27 /*
  28  * From ICQ protocol description:
  29  * "Integers consisting of more than one byte is stored
  30  * with the least significant byte first, and the most significant byte last
  31  * (as is usual on the PC/Intel architecture)".
  32  *
  33  * whereas the network byte order, as used on the
  34  * Internet, is Most Significant Byte first. (aka. Big Endian)
  35  */
  36
  37 #ifndef ICQ_BYTEORDER_H_FLAG
  38 #define ICQ_BYTEORDER_H_FLAG
  39
  40 #ifdef HAVE_CONFIG_H
  41 #include <config.h>
  42 #endif
  43
  44 /*
  45  * I am really trying to use builtin optimized byte swap routines.
  46  * they are highly optimised on some platforms.
  47  * But as last resort this simple code is used.
  48  */
  49 #ifndef HAVE_BYTESWAP_H
  50 # ifndef bswap_32
  51 extern unsigned long bswap_32(unsigned long v);
  52 # endif
  53 # ifndef bswap_16
  54 extern unsigned short bswap_16(unsigned short v);
  55 # endif
  56 #endif
  57
  58 #ifdef WORDS_BIGENDIAN
  59 # define htoicql(x)   bswap_32(x)
  60 # define icqtohl(x)   bswap_32(x)
  61 # define htoicqs(x)   bswap_16(x)
  62 # define icqtohs(x)   bswap_16(x)
  63 #else
  64 # define htoicql(x)   (x)
  65 # define icqtohl(x)   (x)
  66 # define htoicqs(x)   (x)
  67 # define icqtohs(x)   (x)
  68 #endif
  69
  70 #endif