mirror of https://gitlab.com/rnger/amath
76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
/*
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 1993-1999 by Jochen Wiedmann and Marcin Orlowski
|
|
* Copyright (C) 2002-2015 FlexCat Open Source Team
|
|
*
|
|
* 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.
|
|
*
|
|
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
*/
|
|
|
|
#include "flexcat.h"
|
|
|
|
/// Swappers...
|
|
|
|
unsigned short (*SwapWord)(unsigned short r) = NULL;
|
|
uint32 (*SwapLong)(uint32 r) = NULL;
|
|
|
|
unsigned short SwapWord21(unsigned short r)
|
|
{
|
|
return (unsigned short)(((r & 0xff00) >> 8) | ((r & 0x00ff) << 8));
|
|
}
|
|
|
|
unsigned short SwapWord12(unsigned short r)
|
|
{
|
|
return r;
|
|
}
|
|
|
|
uint32 SwapLong4321(uint32 r)
|
|
{
|
|
return (((r & 0xff000000) >> 24) | ((r & 0x00ff0000) >> 8) | ((r & 0x0000ff00) << 8) | ((r & 0x000000ff) << 24));
|
|
}
|
|
uint32 SwapLong1234(uint32 r)
|
|
{
|
|
return r;
|
|
}
|
|
///
|
|
/// SwapChoose
|
|
|
|
int SwapChoose(void)
|
|
{
|
|
unsigned short w;
|
|
uint32 d;
|
|
|
|
strncpy((char *)&w, "\1\2", 2);
|
|
strncpy((char *)&d, "\1\2\3\4", 4);
|
|
|
|
if(w == 0x0201)
|
|
SwapWord = SwapWord21;
|
|
else if(w == 0x0102)
|
|
SwapWord = SwapWord12;
|
|
else
|
|
return 0;
|
|
|
|
if(d == 0x04030201)
|
|
SwapLong = SwapLong4321;
|
|
else if(d == 0x01020304)
|
|
SwapLong = SwapLong1234;
|
|
else
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
///
|