uti_end.c

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/**********************************************************/
/*/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\*/
/*
Copyright: 1997 - CSTR University of Edinburg

Nombre fuente................ UTI_END.C
Nombre paquete............... UTI.H
Lenguaje fuente.............. C (BC31,GCC)
Estado....................... Utilizable
Dependencia Hard/OS.......... -
Codigo condicional........... -

Codificacion................. Borja Etxebarria

Version  dd/mm/aa  Autor     Comentario
-------  --------  --------  ----------
1.0.0    22/07/97  Borja     initial

======================== Contenido ========================
Big endian / little endian conversion
===========================================================
*/
/*/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\*/
/**********************************************************/

#include "uti.h"

/**********************************************************/

VOID endian_swap16( VOID * word16 )
{
#define P ((BYTE*)word16)
   BYTE tmp;
   tmp =P[0];
   P[0]=P[1];
   P[1]=tmp;
#undef P
}

/**********************************************************/

VOID endian_swap32( VOID * word32 )
{
#define P ((BYTE*)word32)
   BYTE tmp;
   tmp =P[0];
   P[0]=P[3];
   P[3]=tmp;
   tmp =P[1];
   P[1]=P[2];
   P[2]=tmp;
#undef P
}

/**********************************************************/

VOID endian_swap64( VOID * word64 )
{
#define P ((BYTE*)word64)
   BYTE tmp;
   tmp =P[0];
   P[0]=P[7];
   P[7]=tmp;
   tmp =P[1];
   P[1]=P[6];
   P[6]=tmp;
   tmp =P[2];
   P[2]=P[5];
   P[5]=tmp;
     tmp =P[3];
   P[3]=P[4];
   P[4]=tmp;
#undef P
}

/**********************************************************/

VOID endian_swap16_n( VOID * word16, int n )
{
     BYTE tmp;
     BYTE *p=(BYTE*)word16;

     while (n) {
            n--;
            tmp =p[0];
            p[0]=p[1];
            p[1]=tmp;
            p+=2;
     }
}

/**********************************************************/

VOID endian_swap32_n( VOID * word32, int n )
{
     BYTE tmp;
     BYTE *p=(BYTE*)word32;

     while (n) {
            n--;
            tmp =p[0];
            p[0]=p[3];
            p[3]=tmp;
            tmp =p[1];
            p[1]=p[2];
            p[2]=tmp;
            p+=4;
     }
}

/**********************************************************/

VOID endian_swap64_n( VOID * word64, int n )
{
     BYTE tmp;
     BYTE *p=(BYTE*)word64;

     while (n) {
            n--;
            tmp =p[0];
            p[0]=p[7];
            p[7]=tmp;
            tmp =p[1];
            p[1]=p[6];
            p[6]=tmp;
            tmp =p[2];
            p[2]=p[5];
            p[5]=tmp;
            tmp =p[3];
            p[3]=p[4];
            p[4]=tmp;
            p+=8;
   }
}

/**********************************************************/

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