kopia lustrzana https://github.com/espressif/esp-idf
74 wiersze
2.2 KiB
C
74 wiersze
2.2 KiB
C
/*
|
|
* 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 */
|