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/* Copyright (c) 1996-2004, Adaptec Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of the Adaptec Corporation nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*File - SWAP_EM.CPP */
/*****************************************************************************/
/* */
/*Description: */
/* */
/* This files provides two functions to swap the bytes of two and */
/*four byte variables. These functions can be used to convert between */
/*Motorola and Intel byte ordering. */
/* */
/* */
/*Author: Doug Anderson */
/*Date: 9/16/93 */
/* */
/*Editors: */
/* */
/*Remarks: */
/* */
/* */
/*****************************************************************************/
/*Include Files -------------------------------------------------------------*/
#include <osd_util.h>
/*Function - swap2 - start */
/*===========================================================================*/
/* */
/*Description: */
/* */
/* This function swaps the MSB & LSB of a two byte variable. */
/* */
/*Parameters: */
/* */
/*Return Value: */
/* */
/*Global Variables Affected: */
/* */
/*Remarks: (Side effects, Assumptions, Warnings...) */
/* */
/* */
/*---------------------------------------------------------------------------*/
uSHORT osdSwap2(uSHORT *inShort)
{
#if defined ( _DPT_BIG_ENDIAN )
# if (defined ( _DPT_STRICT_ALIGN ) )
uSHORT i;
i = (unsigned short)*((unsigned char *)inShort);
i <<= 8;
i |= (unsigned short)*(((unsigned char *)inShort)+1);
return (i);
# else
return(*inShort);
# endif
#else
uSHORT i;
i = *inShort & 0x0ff;
*inShort >>= 8;
*inShort |= (i << 8);
return(*inShort);
#endif
}
/*swap2() - end */
/*Function - swap4 - start */
/*===========================================================================*/
/* */
/*Description: */
/* */
/* This function reverses the byte ordering of a four byte variable. */
/* */
/*Parameters: */
/* */
/*Return Value: */
/* */
/*Global Variables Affected: */
/* */
/*Remarks: (Side effects, Assumptions, Warnings...) */
/* */
/* */
/*---------------------------------------------------------------------------*/
uLONG osdSwap4(uLONG *inLong)
{
#if defined ( _DPT_BIG_ENDIAN )
# if (defined ( _DPT_STRICT_ALIGN ))
uLONG i;
i = (unsigned long)*((unsigned char *)inLong) << 24;
i |= (unsigned long)*(((unsigned char *)inLong)+1) << 16;
i |= (unsigned long)*(((unsigned char *)inLong)+2) << 8;
i |= (unsigned long)*(((unsigned char *)inLong)+3);
return (i);
# else
return(*inLong);
# endif
#else
char src[4], *dst;
int i;
*(uLONG *)src = *inLong;
dst = (char *)inLong;
for(i = 0; i < 4; ++i)
{
dst[i] = src[3 - i];
}
return(*inLong);
#endif
}
/*swap4() - end */
uLONG osdSwap3(uLONG *inLong)
{
#if defined ( _DPT_BIG_ENDIAN )
# if (defined ( _DPT_STRICT_ALIGN ))
uLONG i;
i = (unsigned long)*(((unsigned char *)inLong)+0) << 16;
i |= (unsigned long)*(((unsigned char *)inLong)+1) << 8;
i |= (unsigned long)*(((unsigned char *)inLong)+2);
return (i);
# else
return(*inLong);
# endif
#else
return((osdSwap4(inLong) >> 8));
#endif
}
/*Function - trueSwap2 - start */
/*===========================================================================*/
/* */
/*Description: */
/* */
/* This function ALWAYS swaps the MSB & LSB of a two byte variable. */
/* */
/*Parameters: */
/* */
/*Return Value: */
/* */
/*Global Variables Affected: */
/* */
/*Remarks: (Side effects, Assumptions, Warnings...) */
/* */
/* */
/*---------------------------------------------------------------------------*/
uSHORT trueSwap2(uSHORT *inShort)
{
uSHORT outShort;
char *src, *dst;
int i;
src = (char *)inShort;
dst = (char *)&outShort;
dst[0] = src[1];
dst[1] = src[0];
src[0] = dst[0];
src[1] = dst[1];
return outShort;
}
/* trueSwap2() - end */
/*Function - trueSwap4 - start */
/*===========================================================================*/
/* */
/*Description: */
/* */
/* This function ALWAYS reverses the byte ordering of a four byte variable. */
/* */
/*Parameters: */
/* */
/*Return Value: */
/* */
/*Global Variables Affected: */
/* */
/*Remarks: (Side effects, Assumptions, Warnings...) */
/* */
/* */
/*---------------------------------------------------------------------------*/
uLONG trueSwap4(uLONG *inLong)
{
uLONG outLong;
char *src, *dst;
int i;
src = (char *)inLong;
dst = (char *)&outLong;
for(i = 0; i < 4; ++i)
{
dst[i] = src[3 - i];
}
for(i = 0; i < 4; ++i)
{
src[i] = dst[i];
}
return outLong;
}
/* trueSwap4() - end */
//Function - netSwap4() - start
//===========================================================================
//
//Description:
//
// This function ensures that the input four byte variable is returned
// in DPT network order (little-endian). On big-endian machines this
// function will swap the four byte variable. On little-endian machines
// this function will return the input value.
//
//Parameters:
//
// val = 4 byte variable to be byte reversed.
//
//Return Value:
//
// The variable in network order.
//
//Global Variables Affected:
//
//Remarks: (Side effects, Assumptions, Warnings...)
//
//---------------------------------------------------------------------------
uLONG netSwap4(uLONG val)
{
#if defined (_DPT_BIG_ENDIAN)
// we need to swap the value and return it
uSHORT wd0, wd1;
wd0 = (uSHORT) val;
wd1 = (uSHORT) (val >> 16);
wd0 = (wd0 >> 8) | (wd0 << 8);
wd1 = (wd1 >> 8) | (wd1 << 8);
return (((uLONG)wd0 << 16) | wd1);
#else
// just return the value for little-endian machines
return val;
#endif // big_endian
}
//netSwap4() - end
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