byteorder.h

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/***************************************************************************
              byteorder.h - Define byteswapping macros if required
                             -------------------
    begin                : Mon Aug 10 2009 15:29 IST
    copyright            : (c) 2009 by Akarsh Simha
    email                : akarsh.simha@kdemail.net
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

/*
NOTE: This file was written from scratch using several headers written
by others as reference. Of particular mention is LICQ's
licq_bytorder.h and Oskar Liljeblad's byteswap.h licensed under the
GPL.
*/

#ifndef BYTEORDER_H_
#define BYTEORDER_H_

// Check if we have standard byteswap headers

#ifdef HAVE_BYTESWAP_H
#include <byteswap.h>

#elif defined HAVE_MACHINE_ENDIAN_H
#include <machine/endian.h>
#define bswap_16(x) swap16(x)
#define bswap_32(x) swap32(x)

#elif defined HAVE_SYS_BYTEORDER_H
#include <sys/byteorder.h>
#define bswap_16(x) BSWAP_16(x)
#define bswap_32(x) BSWAP_32(x)
#endif 

// If no standard headers are found, we define our own byteswap macros

#ifndef bswap_16
#define bswap_16(x) ((( (x) & 0x00FF ) << 8) | (( (x) & 0xFF00 ) >> 8))
#endif

#ifndef bswap_32

#define bswap_32(x) ((( (x) & 0x000000FF ) << 24) | (( (x) & 0x0000FF00 ) << 8) \
                     | (( (x) & 0x00FF0000 ) >> 8) | (( (x) & 0xFF000000 ) >> 24))
#endif

#endif