miscmaths.cc

   for( ii=0 ; ii < n ; ii++ ){
     tt = tb[ii].a ; tb[ii].a = tb[ii].b ; tb[ii].b = tt ;
   }
   return ;
}

/*---------------------------------------------------------------------------*/

typedef struct { unsigned char a,b,c,d ; } FOURbytes ;

void Swap_4bytes( int n , void *ar )    /* 4 bytes at a time */
{
   register int ii ;
   register FOURbytes *tb = (FOURbytes *)ar ;
   register unsigned char tt ;

   for( ii=0 ; ii < n ; ii++ ){
     tt = tb[ii].a ; tb[ii].a = tb[ii].d ; tb[ii].d = tt ;
     tt = tb[ii].b ; tb[ii].b = tb[ii].c ; tb[ii].c = tt ;
   }
   return ;
}

/*---------------------------------------------------------------------------*/

typedef struct { unsigned char a,b,c,d , D,C,B,A ; } EIGHTbytes ;

void Swap_8bytes( int n , void *ar )    /* 8 bytes at a time */
{
   register int ii ;
   register EIGHTbytes *tb = (EIGHTbytes *)ar ;
   register unsigned char tt ;

   for( ii=0 ; ii < n ; ii++ ){
     tt = tb[ii].a ; tb[ii].a = tb[ii].A ; tb[ii].A = tt ;
     tt = tb[ii].b ; tb[ii].b = tb[ii].B ; tb[ii].B = tt ;
     tt = tb[ii].c ; tb[ii].c = tb[ii].C ; tb[ii].C = tt ;
     tt = tb[ii].d ; tb[ii].d = tb[ii].D ; tb[ii].D = tt ;
   }
   return ;
}

/*---------------------------------------------------------------------------*/

typedef struct { unsigned char a,b,c,d,e,f,g,h ,
                               H,G,F,E,D,C,B,A  ; } SIXTEENbytes ;

void Swap_16bytes( int n , void *ar )    /* 16 bytes at a time */
{
   register int ii ;
   register SIXTEENbytes *tb = (SIXTEENbytes *)ar ;
   register unsigned char tt ;

   for( ii=0 ; ii < n ; ii++ ){
     tt = tb[ii].a ; tb[ii].a = tb[ii].A ; tb[ii].A = tt ;
     tt = tb[ii].b ; tb[ii].b = tb[ii].B ; tb[ii].B = tt ;
     tt = tb[ii].c ; tb[ii].c = tb[ii].C ; tb[ii].C = tt ;
     tt = tb[ii].d ; tb[ii].d = tb[ii].D ; tb[ii].D = tt ;

     tt = tb[ii].e ; tb[ii].e = tb[ii].E ; tb[ii].E = tt ;
     tt = tb[ii].f ; tb[ii].f = tb[ii].F ; tb[ii].F = tt ;
     tt = tb[ii].g ; tb[ii].g = tb[ii].G ; tb[ii].G = tt ;
     tt = tb[ii].h ; tb[ii].h = tb[ii].H ; tb[ii].H = tt ;
   }
   return ;
}

/*---------------------------------------------------------------------------*/

void Swap_Nbytes( int n , int siz , void *ar )  /* subsuming case */
{
   switch( siz ){
     case 2:  Swap_2bytes ( n , ar ) ; break ;
     case 4:  Swap_4bytes ( n , ar ) ; break ;
     case 8:  Swap_8bytes ( n , ar ) ; break ;
     case 16: Swap_16bytes( n , ar ) ; break ;
   }
   return ;
}

// end namespace MISCMATHS
}