bswap.h

   1 #ifndef BSWAP_H
   2 #define BSWAP_H
   3
   4 #include "config-host.h"
   5
   6 #include <inttypes.h>
   7
   8 #ifdef HAVE_BYTESWAP_H
   9 #include <byteswap.h>
  10 #else
  11
  12 #define bswap_16(x) \
  13 ({ \
  14         uint16_t __x = (x); \
  15         ((uint16_t)( \
  16                 (((uint16_t)(__x) & (uint16_t)0x00ffU) << 8) | \
  17                 (((uint16_t)(__x) & (uint16_t)0xff00U) >> 8) )); \
  18 })
  19
  20 #define bswap_32(x) \
  21 ({ \
  22         uint32_t __x = (x); \
  23         ((uint32_t)( \
  24                 (((uint32_t)(__x) & (uint32_t)0x000000ffUL) << 24) | \
  25                 (((uint32_t)(__x) & (uint32_t)0x0000ff00UL) <<  8) | \
  26                 (((uint32_t)(__x) & (uint32_t)0x00ff0000UL) >>  8) | \
  27                 (((uint32_t)(__x) & (uint32_t)0xff000000UL) >> 24) )); \
  28 })
  29
  30 #define bswap_64(x) \
  31 ({ \
  32         uint64_t __x = (x); \
  33         ((uint64_t)( \
  34                 (uint64_t)(((uint64_t)(__x) & (uint64_t)0x00000000000000ffULL) << 56) | \
  35                 (uint64_t)(((uint64_t)(__x) & (uint64_t)0x000000000000ff00ULL) << 40) | \
  36                 (uint64_t)(((uint64_t)(__x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \
  37                 (uint64_t)(((uint64_t)(__x) & (uint64_t)0x00000000ff000000ULL) <<  8) | \
  38                 (uint64_t)(((uint64_t)(__x) & (uint64_t)0x000000ff00000000ULL) >>  8) | \
  39                 (uint64_t)(((uint64_t)(__x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \
  40                 (uint64_t)(((uint64_t)(__x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \
  41                 (uint64_t)(((uint64_t)(__x) & (uint64_t)0xff00000000000000ULL) >> 56) )); \
  42 })
  43
  44 #endif /* !HAVE_BYTESWAP_H */
  45
  46 static inline uint16_t bswap16(uint16_t x)
  47 {
  48     return bswap_16(x);
  49 }
  50
  51 static inline uint32_t bswap32(uint32_t x)
  52 {
  53     return bswap_32(x);
  54 }
  55
  56 static inline uint64_t bswap64(uint64_t x)
  57 {
  58     return bswap_64(x);
  59 }
  60
  61 static inline void bswap16s(uint16_t *s)
  62 {
  63     *s = bswap16(*s);
  64 }
  65
  66 static inline void bswap32s(uint32_t *s)
  67 {
  68     *s = bswap32(*s);
  69 }
  70
  71 static inline void bswap64s(uint64_t *s)
  72 {
  73     *s = bswap64(*s);
  74 }
  75
  76 #endif /* BSWAP_H */