Mine

#ifndef linux

static inline unsigned short bswap_16(unsigned short x) {
  return (x>>8) | (x<<8);
}

static inline unsigned int bswap_32(unsigned int x) {
  return (bswap_16(x&0xffff)<<16) | (bswap_16(x>>16));
}

static inline unsigned long long bswap_64(unsigned long long x) {
  return (((unsigned long long)bswap_32(x&0xffffffffull))<<32) | (bswap_32(x>>32));
}

#endif