#include "dcwSwap.h"

/********************************************************************
* Function Name: dcwSwapBytes
* Author       : Dan Wilkinson & Grigoriy Ushomirskiy
* Date         : August 24, 1992
* Function     : Swap byte order of a 16-bit or 32-bit integer.
*********************************************************************/

short dcwSwapBytes( char *in, short Bytes )

{
   char c;

#ifdef SWAPBYTES

   switch( Bytes ){

      case TWO_BYTES:
         c=*in;
         *in=*(in+1);
         *(in+1)=c;
         return( GOOD);
  
      case FOUR_BYTES:
         c=*in;
         *in=*(in+3);
         *(in+3)=c;
         c=*(in+1);
         *(in+1)=*(in+2);
         *(in+2)=c;
         return( GOOD );

   }

   return( BAD );

#else

   return( GOOD );   

#endif

}
 
/********************************************************************
* Function Name: dcwSwapShort
* Author       : Dan Wilkinson & Grigoriy Ushomirskiy
* Date         : November 10, 1995
* Function     : Return a 16-bit integer with the two bytes in reverse order.
*********************************************************************/

short dcwSwapShort( short Value )

{
   char c, *in;
      
   in = (char *) &Value;

#ifdef SWAPBYTES

   c=*in;                /* Value in left byte stored in c */
   *in=*(in+1);          /* New Left byte value set to Old right byte value */
   *(in+1)=c;            /* New Right byte value set to Old left byte value sorted in c */ 
     
#endif

return( Value );

}  


/********************************************************************
* Function Name: dcwSwapLong
* Author       : Dan Wilkinson & Grigoriy Ushomirskiy
* Date         : November   10, 1995
* Function     : Return a 32-bit integer with the four bytes in reverse order.
*********************************************************************/

long dcwSwapLong( long Value )

{
   char c, *in;
      
   in = (char *) &Value;

#ifdef SWAPBYTES 

   c=*in;           
   *in=*(in+3);     
   *(in+3)=c;
   c=*(in+1);
   *(in+1)=*(in+2);
   *(in+2)=c;
   
#endif

return( Value );

}