endian.h

#define __bswap_constant_16(x) \
     ((unsigned short int) ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)))

#define __bswap_constant_32(x) \
     ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >>  8) |		      \
      (((x) & 0x0000ff00) <<  8) | (((x) & 0x000000ff) << 24))

# 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_16 __bswap_constant_16
#define __bswap_32 __bswap_constant_32
#define __bswap_64 __bswap_constant_64


#  define htobe16(x) __bswap_16 (x)
#  define htole16(x) (x)
#  define be16toh(x) __bswap_16 (x)
#  define le16toh(x) (x)

#  define htobe32(x) __bswap_32 (x)
#  define htole32(x) (x)
#  define be32toh(x) __bswap_32 (x)
#  define le32toh(x) (x)

#  define htobe64(x) __bswap_64 (x)
#  define htole64(x) (x)
#  define be64toh(x) __bswap_64 (x)
#  define le64toh(x) (x)