/usr/include/calc/byteswap.h is in apcalc-dev 2.12.5.0-1+b3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* byteswap - byte swapping macros
*
* Copyright (C) 1999,2014 Landon Curt Noll
*
* Calc is open software; you can redistribute it and/or modify it under
* the terms of the version 2.1 of the GNU Lesser General Public License
* as published by the Free Software Foundation.
*
* Calc 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 Lesser General
* Public License for more details.
*
* A copy of version 2.1 of the GNU Lesser General Public License is
* distributed with calc under the filename COPYING-LGPL. You should have
* received a copy with calc; if not, write to Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* @(#) $Revision: 30.3 $
* @(#) $Id: byteswap.h,v 30.3 2014/08/24 21:56:51 chongo Exp $
* @(#) $Source: /usr/local/src/bin/calc/RCS/byteswap.h,v $
*
* Under source code control: 1995/10/11 04:44:01
* File existed as early as: 1995
*
* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
*/
#if !defined(INCLUDE_BYTESWAP_H)
#define INCLUDE_BYTESWAP_H
#if defined(CALC_SRC) /* if we are building from the calc source tree */
# include "calc/longbits.h"
#else
# include <calc/longbits.h>
#endif
/*
* SWAP_B8_IN_B16 - swap 8 bits in 16 bits
*
* dest - pointer to where the swapped src wil be put
* src - pointer to a 16 bit value to swap
*
* This macro will either switch to the opposite byte sex (Big Endian vs.
* Little Endian) a 16 bit value.
*/
#define SWAP_B8_IN_B16(dest, src) ( \
*((USB16*)(dest)) = \
(((*((USB16*)(src))) << 8) | ((*((USB16*)(src))) >> 8)) \
)
/*
* SWAP_B16_IN_B32 - swap 16 bits in 32 bits
*
* dest - pointer to where the swapped src wil be put
* src - pointer to a 32 bit value to swap
*/
#define SWAP_B16_IN_B32(dest, src) ( \
*((USB32*)(dest)) = \
(((*((USB32*)(src))) << 16) | ((*((USB32*)(src))) >> 16)) \
)
/*
* SWAP_B8_IN_B32 - swap 8 & 16 bits in 32 bits
*
* dest - pointer to where the swapped src wil be put
* src - pointer to a 32 bit value to swap
*
* This macro will either switch to the opposite byte sex (Big Endian vs.
* Little Endian) a 32 bit value.
*/
#define SWAP_B8_IN_B32(dest, src) ( \
SWAP_B16_IN_B32(dest, src), \
(*((USB32*)(dest)) = \
((((*((USB32*)(dest))) & (USB32)0xff00ff00) >> 8) | \
(((*((USB32*)(dest))) & (USB32)0x00ff00ff) << 8))) \
)
#if defined(HAVE_B64)
/*
* SWAP_B32_IN_B64 - swap 32 bits in 64 bits
*
* dest - pointer to where the swapped src wil be put
* src - pointer to a 64 bit value to swap
*/
#define SWAP_B32_IN_B64(dest, src) ( \
*((USB64*)(dest)) = \
(((*((USB64*)(src))) << 32) | ((*((USB64*)(src))) >> 32)) \
)
/*
* SWAP_B16_IN_B64 - swap 16 & 32 bits in 64 bits
*
* dest - pointer to where the swapped src wil be put
* src - pointer to a 64 bit value to swap
*/
#define SWAP_B16_IN_B64(dest, src) ( \
SWAP_B32_IN_B64(dest, src), \
(*((USB64*)(dest)) = \
((((*((USB64*)(dest))) & (USB64)0xffff0000ffff0000) >> 16) | \
(((*((USB64*)(dest))) & (USB64)0x0000ffff0000ffff) << 16))) \
)
/*
* SWAP_B8_IN_B64 - swap 16 & 32 bits in 64 bits
*
* dest - pointer to where the swapped src wil be put
* src - pointer to a 64 bit value to swap
*
* This macro will either switch to the opposite byte sex (Big Endian vs.
* Little Endian) a 64 bit value.
*/
#define SWAP_B8_IN_B64(dest, src) ( \
SWAP_B16_IN_B64(dest, src), \
(*((USB64*)(dest)) = \
((((*((USB64*)(dest))) & (USB64)0xff00ff00ff00ff00) >> 8) | \
(((*((USB64*)(dest))) & (USB64)0x00ff00ff00ff00ff) << 8))) \
)
#else /* HAVE_B64 */
/*
* SWAP_B32_IN_B64 - swap 32 bits in 64 bits (simulated by 2 32 bit values)
*
* dest - pointer to where the swapped src wil be put
* src - pointer to a 64 bit value to swap
*/
#define SWAP_B32_IN_B64(dest, src) ( \
((USB32*)(dest))[1] = ((USB32*)(dest))[0], \
((USB32*)(dest))[0] = ((USB32*)(dest))[1] \
)
/*
* SWAP_B16_IN_B64 - swap 16 & 32 bits in 64 bits (simulated by 2 32 bit vals)
*
* dest - pointer to where the swapped src wil be put
* src - pointer to a 64 bit value to swap
*/
#define SWAP_B16_IN_B64(dest, src) ( \
SWAP_B16_IN_B32(((USB32*)dest)+1, ((USB32*)src)), \
SWAP_B16_IN_B32(((USB32*)dest), ((USB32*)src)+1) \
)
/*
* SWAP_B8_IN_B64 - swap 16 & 32 bits in 64 bits (simulated by 2 32 bit vals)
*
* dest - pointer to where the swapped src wil be put
* src - pointer to a 64 bit value to swap
*
* This macro will either switch to the opposite byte sex (Big Endian vs.
* Little Endian) a 64 bit value.
*/
#define SWAP_B8_IN_B64(dest, src) ( \
SWAP_B8_IN_B32(((USB32*)dest)+1, ((USB32*)src)), \
SWAP_B8_IN_B32(((USB32*)dest), ((USB32*)src)+1) \
)
#endif /* HAVE_B64 */
#if LONG_BITS == 64
#define SWAP_B32_IN_LONG(dest, src) SWAP_B32_IN_B64(dest, src)
#define SWAP_B16_IN_LONG(dest, src) SWAP_B16_IN_B64(dest, src)
#define SWAP_B8_IN_LONG(dest, src) SWAP_B8_IN_B64(dest, src)
#else /* LONG_BITS == 64 */
#define SWAP_B32_IN_LONG(dest, src) SWAP_B32_IN_B32(dest, src)
#define SWAP_B16_IN_LONG(dest, src) SWAP_B16_IN_B32(dest, src)
#define SWAP_B8_IN_LONG(dest, src) SWAP_B8_IN_B32(dest, src)
#endif /* LONG_BITS == 64 */
#endif /* !INCLUDE_BYTESWAP_H */
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