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a31078bbec
Some folks might think: “you still use RCS”?!? And we will say, hey, at least we switched from SCCS to RCS back in … I think it was around 1994 ... at least we are keeping up! :-) :-) :-) Logs say that SCCS version 18 became RCS version 19 on 1994 March 18. RCS served us well. But now it is time to move on. And so we are switching to git. Calc releases produce a lot of file changes. In the 125 releases of calc since 1996, when I started managing calc releases, there have been 15473 file mods!
178 lines
5.2 KiB
C
178 lines
5.2 KiB
C
/*
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* byteswap - byte swapping macros
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*
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* Copyright (C) 1999,2014 Landon Curt Noll
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*
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* Calc is open software; you can redistribute it and/or modify it under
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* the terms of the version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* Calc is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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* Public License for more details.
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*
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* A copy of version 2.1 of the GNU Lesser General Public License is
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* distributed with calc under the filename COPYING-LGPL. You should have
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* received a copy with calc; if not, write to Free Software Foundation, Inc.
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Under source code control: 1995/10/11 04:44:01
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* File existed as early as: 1995
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*
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* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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*/
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#if !defined(INCLUDE_BYTESWAP_H)
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#define INCLUDE_BYTESWAP_H
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#if defined(CALC_SRC) /* if we are building from the calc source tree */
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# include "longbits.h"
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#else
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# include <calc/longbits.h>
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#endif
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/*
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* SWAP_B8_IN_B16 - swap 8 bits in 16 bits
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*
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* dest - pointer to where the swapped src wil be put
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* src - pointer to a 16 bit value to swap
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*
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* This macro will either switch to the opposite byte sex (Big Endian vs.
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* Little Endian) a 16 bit value.
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*/
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#define SWAP_B8_IN_B16(dest, src) ( \
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*((USB16*)(dest)) = \
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(((*((USB16*)(src))) << 8) | ((*((USB16*)(src))) >> 8)) \
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)
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/*
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* SWAP_B16_IN_B32 - swap 16 bits in 32 bits
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*
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* dest - pointer to where the swapped src wil be put
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* src - pointer to a 32 bit value to swap
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*/
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#define SWAP_B16_IN_B32(dest, src) ( \
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*((USB32*)(dest)) = \
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(((*((USB32*)(src))) << 16) | ((*((USB32*)(src))) >> 16)) \
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)
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/*
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* SWAP_B8_IN_B32 - swap 8 & 16 bits in 32 bits
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*
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* dest - pointer to where the swapped src wil be put
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* src - pointer to a 32 bit value to swap
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*
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* This macro will either switch to the opposite byte sex (Big Endian vs.
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* Little Endian) a 32 bit value.
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*/
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#define SWAP_B8_IN_B32(dest, src) ( \
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SWAP_B16_IN_B32(dest, src), \
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(*((USB32*)(dest)) = \
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((((*((USB32*)(dest))) & (USB32)0xff00ff00) >> 8) | \
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(((*((USB32*)(dest))) & (USB32)0x00ff00ff) << 8))) \
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)
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#if defined(HAVE_B64)
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/*
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* SWAP_B32_IN_B64 - swap 32 bits in 64 bits
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*
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* dest - pointer to where the swapped src wil be put
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* src - pointer to a 64 bit value to swap
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*/
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#define SWAP_B32_IN_B64(dest, src) ( \
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*((USB64*)(dest)) = \
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(((*((USB64*)(src))) << 32) | ((*((USB64*)(src))) >> 32)) \
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)
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/*
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* SWAP_B16_IN_B64 - swap 16 & 32 bits in 64 bits
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*
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* dest - pointer to where the swapped src wil be put
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* src - pointer to a 64 bit value to swap
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*/
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#define SWAP_B16_IN_B64(dest, src) ( \
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SWAP_B32_IN_B64(dest, src), \
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(*((USB64*)(dest)) = \
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((((*((USB64*)(dest))) & (USB64)0xffff0000ffff0000) >> 16) | \
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(((*((USB64*)(dest))) & (USB64)0x0000ffff0000ffff) << 16))) \
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)
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/*
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* SWAP_B8_IN_B64 - swap 16 & 32 bits in 64 bits
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*
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* dest - pointer to where the swapped src wil be put
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* src - pointer to a 64 bit value to swap
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*
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* This macro will either switch to the opposite byte sex (Big Endian vs.
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* Little Endian) a 64 bit value.
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*/
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#define SWAP_B8_IN_B64(dest, src) ( \
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SWAP_B16_IN_B64(dest, src), \
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(*((USB64*)(dest)) = \
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((((*((USB64*)(dest))) & (USB64)0xff00ff00ff00ff00) >> 8) | \
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(((*((USB64*)(dest))) & (USB64)0x00ff00ff00ff00ff) << 8))) \
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)
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#else /* HAVE_B64 */
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/*
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* SWAP_B32_IN_B64 - swap 32 bits in 64 bits (simulated by 2 32 bit values)
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*
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* dest - pointer to where the swapped src wil be put
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* src - pointer to a 64 bit value to swap
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*/
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#define SWAP_B32_IN_B64(dest, src) ( \
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((USB32*)(dest))[1] = ((USB32*)(dest))[0], \
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((USB32*)(dest))[0] = ((USB32*)(dest))[1] \
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)
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/*
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* SWAP_B16_IN_B64 - swap 16 & 32 bits in 64 bits (simulated by 2 32 bit vals)
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*
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* dest - pointer to where the swapped src wil be put
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* src - pointer to a 64 bit value to swap
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*/
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#define SWAP_B16_IN_B64(dest, src) ( \
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SWAP_B16_IN_B32(((USB32*)dest)+1, ((USB32*)src)), \
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SWAP_B16_IN_B32(((USB32*)dest), ((USB32*)src)+1) \
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)
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/*
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* SWAP_B8_IN_B64 - swap 16 & 32 bits in 64 bits (simulated by 2 32 bit vals)
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*
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* dest - pointer to where the swapped src wil be put
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* src - pointer to a 64 bit value to swap
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*
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* This macro will either switch to the opposite byte sex (Big Endian vs.
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* Little Endian) a 64 bit value.
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*/
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#define SWAP_B8_IN_B64(dest, src) ( \
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SWAP_B8_IN_B32(((USB32*)dest)+1, ((USB32*)src)), \
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SWAP_B8_IN_B32(((USB32*)dest), ((USB32*)src)+1) \
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)
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#endif /* HAVE_B64 */
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#if LONG_BITS == 64
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#define SWAP_B32_IN_LONG(dest, src) SWAP_B32_IN_B64(dest, src)
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#define SWAP_B16_IN_LONG(dest, src) SWAP_B16_IN_B64(dest, src)
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#define SWAP_B8_IN_LONG(dest, src) SWAP_B8_IN_B64(dest, src)
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#else /* LONG_BITS == 64 */
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#define SWAP_B32_IN_LONG(dest, src) SWAP_B32_IN_B32(dest, src)
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#define SWAP_B16_IN_LONG(dest, src) SWAP_B16_IN_B32(dest, src)
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#define SWAP_B8_IN_LONG(dest, src) SWAP_B8_IN_B32(dest, src)
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#endif /* LONG_BITS == 64 */
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#endif /* !INCLUDE_BYTESWAP_H */
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