1  __extension__ typedef unsigned long long int uint64_t;
       2  typedef uint64_t ScmUInt64;
       3  void swapb64(ScmUInt64 *loc) 
       4  {
       5      union {
       6          ScmUInt64 l;
       7          unsigned char c[4];
       8      } dd;
       9      unsigned char t;
      10      dd.l = *loc;
      11      (t = dd.c[3], dd.c[3] = dd.c[4], dd.c[4] = t);
      12  }