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/*
* Copyright (c) 2010 Espressif System
*/
#ifndef BYTESWAP_H
#define BYTESWAP_H
#include <machine/endian.h>
/* Swap bytes in 16 bit value. */
#ifndef __bswap_16
#ifdef __GNUC__
# define __bswap_16(x) \
(__extension__ \
({ unsigned short int __bsx = (x); \
((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8)); }))
#else
static INLINE unsigned short int
__bswap_16 (unsigned short int __bsx)
{
return ((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8));
}
#endif
#endif // __bswap_16
/* Swap bytes in 32 bit value. */
#ifndef __bswap_32
#ifdef __GNUC__
# define __bswap_32(x) \
(__extension__ \
({ unsigned int __bsx = (x); \
((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >> 8) | \
(((__bsx) & 0x0000ff00) << 8) | (((__bsx) & 0x000000ff) << 24)); }))
#else
static INLINE unsigned int
__bswap_32 (unsigned int __bsx)
{
return ((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >> 8) |
(((__bsx) & 0x0000ff00) << 8) | (((__bsx) & 0x000000ff) << 24));
}
#endif
#endif // __bswap_32
#ifndef __bswap_64
#if defined __GNUC__ && __GNUC__ >= 2
/* Swap bytes in 64 bit value. */
# define __bswap_constant_64(x) \
((((x) & 0xff00000000000000ull) >> 56) \
| (((x) & 0x00ff000000000000ull) >> 40) \
| (((x) & 0x0000ff0000000000ull) >> 24) \
| (((x) & 0x000000ff00000000ull) >> 8) \
| (((x) & 0x00000000ff000000ull) << 8) \
| (((x) & 0x0000000000ff0000ull) << 24) \
| (((x) & 0x000000000000ff00ull) << 40) \
| (((x) & 0x00000000000000ffull) << 56))
# define __bswap_64(x) \
(__extension__ \
({ union { __extension__ unsigned long long int __ll; \
unsigned int __l[2]; } __w, __r; \
if (__builtin_constant_p (x)) \
__r.__ll = __bswap_constant_64 (x); \
else \
{ \
__w.__ll = (x); \
__r.__l[0] = __bswap_32 (__w.__l[1]); \
__r.__l[1] = __bswap_32 (__w.__l[0]); \
} \
__r.__ll; }))
#endif
#endif // __bswap_64
#endif /* BYTESWAP_H */
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