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/*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright © 2022 Keith Packard
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the copyright holder 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 HOLDER 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.
*/
#ifndef __BYTESWAP_H__
#define __BYTESWAP_H__
#include <sys/cdefs.h>
_BEGIN_STD_C
#ifdef __GNUC__
#define bswap_16(_x) __builtin_bswap16(_x)
#define bswap_32(_x) __builtin_bswap32(_x)
#define bswap_64(_x) __builtin_bswap64(_x)
#else /* __GNUC__ */
static __inline __uint16_t
bswap_16(__uint16_t _x)
{
return ((__uint16_t)((_x >> 8) | ((_x << 8) & 0xff00)));
}
static __inline __uint32_t
bswap_32(__uint32_t _x)
{
return ((__uint32_t)((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000)
| ((_x << 24) & 0xff000000)));
}
static __inline __uint64_t
bswap_64(__uint64_t _x)
{
return ((__uint64_t)((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000)
| ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32))
| ((_x << 24) & ((__uint64_t)0xff << 40))
| ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56))));
}
#endif /* !__GNUC__ */
_END_STD_C
#endif /* __BYTESWAP_H__ */
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