/*  File: byteswap.h
 *  Author: Simon Kelley (srk@sanger.ac.uk)
 * Copyright (C) J Thierry-Mieg and R Durbin, 1994
 * -------------------------------------------------------------------
 * Acedb 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.
 * 
 * This program 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 * or see the on-line version at http://www.gnu.org/copyleft/gpl.txt
 * -------------------------------------------------------------------
 * This file is part of the ACEDB genome database package, written by
 * 	Richard Durbin (MRC LMB, UK) rd@mrc-lmb.cam.ac.uk, and
 *	Jean Thierry-Mieg (CRBM du CNRS, France) mieg@kaa.cnrs-mop.fr
 *
 * Description: internal to external data representation conversion
 * HISTORY:
    mieg: suppressed acedb4 protection, 
          added reincude protection 
          made swapData a BOOL
 * Last edited: Nov 26 10:47 1998 (fw)
 * Created: Wed 1 Mar 1995 (srk)
 *-------------------------------------------------------------------
 */

/*  $Id: byteswap.h,v 1.7 1999/09/01 11:05:31 fw Exp $  */

/* NB we assume that any type of BSdata can be swapped as if it were an int.
   this means that they must all be exactly 32 bits. True for the new lex disk.
 */

#ifndef BYTESWP_H_DEF
#define BYTESWP_H_DEF

#include "session.h"		/* for extern BOOL swapData */

#if defined(ALPHA) || defined(SGI)
#include <sex.h>
#else
#define swap_word(a) ( ((a) << 24) | \
                      (((a) << 8) & 0x00ff0000) | \
                      (((a) >> 8) & 0x0000ff00) | \
        ((unsigned long)(a) >>24) )

#define swap_half(a) ( ((a & 0xff) << 8) | ((unsigned short)(a) >> 8) )
#endif

#define swapInt(x) swap_word(x)
#define maybeSwapInt(x) (swapData ? swapInt(x) : (x))
#define swapKEY(x) swap_word(x)
#define maybeSwapKEY(x) (swapData ? swapKEY(x) : (x))
#define swapDISK(x) swap_word(x) /* only valid for ACEDB4 */
#define maybeSwapDISK(x) (swapData ? swapDISK(x) : (x))
#define swapNODE(x) swap_half(x)
#define maybeSwapNODE(x) (swapData ? swapNODE(x) : (x))


#endif