mirror of https://gitlab.com/rnger/amath
76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
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/*
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* $Id$
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*
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* Copyright (C) 1993-1999 by Jochen Wiedmann and Marcin Orlowski
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* Copyright (C) 2002-2015 FlexCat Open Source Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* 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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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include "flexcat.h"
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/// Swappers...
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unsigned short (*SwapWord)(unsigned short r) = NULL;
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uint32 (*SwapLong)(uint32 r) = NULL;
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unsigned short SwapWord21(unsigned short r)
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{
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return (unsigned short)(((r & 0xff00) >> 8) | ((r & 0x00ff) << 8));
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}
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unsigned short SwapWord12(unsigned short r)
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{
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return r;
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}
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uint32 SwapLong4321(uint32 r)
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{
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return (((r & 0xff000000) >> 24) | ((r & 0x00ff0000) >> 8) | ((r & 0x0000ff00) << 8) | ((r & 0x000000ff) << 24));
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}
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uint32 SwapLong1234(uint32 r)
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{
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return r;
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}
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///
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/// SwapChoose
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int SwapChoose(void)
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{
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unsigned short w;
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uint32 d;
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strncpy((char *)&w, "\1\2", 2);
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strncpy((char *)&d, "\1\2\3\4", 4);
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if(w == 0x0201)
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SwapWord = SwapWord21;
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else if(w == 0x0102)
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SwapWord = SwapWord12;
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else
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return 0;
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if(d == 0x04030201)
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SwapLong = SwapLong4321;
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else if(d == 0x01020304)
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SwapLong = SwapLong1234;
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else
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return 0;
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return 1;
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}
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///
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