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76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
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/*
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byteswap.h - C preprocessor macros for byte swapping.
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Copyright (C) 1995, 1996 Michael Riepe <michael@stud.uni-hannover.de>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/* @(#) $Id: byteswap.h,v 1.2 1996/10/22 16:45:54 michael Exp $ */
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#ifndef _BYTESWAP_H
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#define _BYTESWAP_H
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#define lu(from,i,s) (((long)((unsigned char*)(from))[i])<<(s))
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#define li(from,i,s) (((long)((signed char*)(from))[i])<<(s))
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#define __load_u16L(from) ((unsigned long)(lu(from,1,8)|lu(from,0,0)))
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#define __load_u16M(from) ((unsigned long)(lu(from,0,8)|lu(from,1,0)))
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#define __load_i16L(from) ((long)(li(from,1,8)|lu(from,0,0)))
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#define __load_i16M(from) ((long)(li(from,0,8)|lu(from,1,0)))
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#define __load_u32L(from) ((unsigned long)(lu(from,3,24)| \
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lu(from,2,16)| \
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lu(from,1,8)| \
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lu(from,0,0)))
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#define __load_u32M(from) ((unsigned long)(lu(from,0,24)| \
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lu(from,1,16)| \
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lu(from,2,8)| \
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lu(from,3,0)))
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#define __load_i32L(from) ((long)(li(from,3,24)| \
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lu(from,2,16)| \
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lu(from,1,8)| \
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lu(from,0,0)))
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#define __load_i32M(from) ((long)(li(from,0,24)| \
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lu(from,1,16)| \
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lu(from,2,8)| \
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lu(from,3,0)))
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#define su(to,i,v,s) (((char*)(to))[i]=((unsigned long)(v)>>(s)))
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#define si(to,i,v,s) (((char*)(to))[i]=((long)(v)>>(s)))
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#define __store_u16L(to,v) (su(to,1,v,8),su(to,0,v,0))
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#define __store_u16M(to,v) (su(to,0,v,8),su(to,1,v,0))
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#define __store_i16L(to,v) (si(to,1,v,8),si(to,0,v,0))
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#define __store_i16M(to,v) (si(to,0,v,8),si(to,1,v,0))
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#define __store_u32L(to,v) (su(to,3,v,24), \
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su(to,2,v,16), \
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su(to,1,v,8), \
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su(to,0,v,0))
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#define __store_u32M(to,v) (su(to,0,v,24), \
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su(to,1,v,16), \
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su(to,2,v,8), \
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su(to,3,v,0))
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#define __store_i32L(to,v) (si(to,3,v,24), \
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si(to,2,v,16), \
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si(to,1,v,8), \
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si(to,0,v,0))
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#define __store_i32M(to,v) (si(to,0,v,24), \
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si(to,1,v,16), \
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si(to,2,v,8), \
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si(to,3,v,0))
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#endif /* _BYTESWAP_H */
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