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/*
byteswap.h - C preprocessor macros for byte swapping.
Copyright (C) 1995 Michael Riepe <riepe@ifwsn4.ifw.uni-hannover.de>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef _BYTESWAP_H
#define _BYTESWAP_H
#define lu(from,i,s) (((long)((unsigned char*)(from))[i])<<(s))
#define li(from,i,s) (((long)((signed char*)(from))[i])<<(s))
#define __load_u16L(from) ((unsigned long)(lu(from,1,8)|lu(from,0,0)))
#define __load_u16M(from) ((unsigned long)(lu(from,0,8)|lu(from,1,0)))
#define __load_i16L(from) ((long)(li(from,1,8)|lu(from,0,0)))
#define __load_i16M(from) ((long)(li(from,0,8)|lu(from,1,0)))
#define __load_u32L(from) ((unsigned long)(lu(from,3,24)| \
lu(from,2,16)| \
lu(from,1,8)| \
lu(from,0,0)))
#define __load_u32M(from) ((unsigned long)(lu(from,0,24)| \
lu(from,1,16)| \
lu(from,2,8)| \
lu(from,3,0)))
#define __load_i32L(from) ((long)(li(from,3,24)| \
lu(from,2,16)| \
lu(from,1,8)| \
lu(from,0,0)))
#define __load_i32M(from) ((long)(li(from,0,24)| \
lu(from,1,16)| \
lu(from,2,8)| \
lu(from,3,0)))
#define su(to,i,v,s) (((char*)(to))[i]=((unsigned long)(v)>>(s)))
#define si(to,i,v,s) (((char*)(to))[i]=((long)(v)>>(s)))
#define __store_u16L(to,v) (su(to,1,v,8),su(to,0,v,0))
#define __store_u16M(to,v) (su(to,0,v,8),su(to,1,v,0))
#define __store_i16L(to,v) (si(to,1,v,8),si(to,0,v,0))
#define __store_i16M(to,v) (si(to,0,v,8),si(to,1,v,0))
#define __store_u32L(to,v) (su(to,3,v,24), \
su(to,2,v,16), \
su(to,1,v,8), \
su(to,0,v,0))
#define __store_u32M(to,v) (su(to,0,v,24), \
su(to,1,v,16), \
su(to,2,v,8), \
su(to,3,v,0))
#define __store_i32L(to,v) (si(to,3,v,24), \
si(to,2,v,16), \
si(to,1,v,8), \
si(to,0,v,0))
#define __store_i32M(to,v) (si(to,0,v,24), \
si(to,1,v,16), \
si(to,2,v,8), \
si(to,3,v,0))
#endif /* _BYTESWAP_H */
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