CigiSwapping.cpp

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#define _EXPORT_CCL_

#include "CigiTypes.h"

union _SWAP_UNION
{
    Cigi_uint32 i;
    Cigi_uint8 b[4];
};
typedef union _SWAP_UNION SWAP_UNION;


// ====================================================================
// CigiSwap2
// ====================================================================
CIGI_SPEC void CigiSwap2( void *dest, const void *src)
{
    static Cigi_uint16 d, s;
    
    s = *( ( Cigi_uint16 *)src);
    
    d = s << 8;
    d |= s >> 8;
    
    *( ( Cigi_uint16 *)dest) = d;
}

// ====================================================================
// CigiSwap4
// ====================================================================
CIGI_SPEC void CigiSwap4( void *dest, const void *src)
{
    static SWAP_UNION d, s;
    
    s.i = *( ( Cigi_uint32 *)src);
    
    d.b[0] = s.b[3];
    d.b[1] = s.b[2];
    d.b[2] = s.b[1];
    d.b[3] = s.b[0];
    
    *( ( Cigi_uint32 *)dest) = d.i;
}

// ====================================================================
// CigiSwap8
// ====================================================================
CIGI_SPEC void CigiSwap8( void *dest, const void *src)
{
    static SWAP_UNION d1, s1;
    static SWAP_UNION d2, s2;
    
    /* Do each word separately.  Each pair of variables should be enclosed within 
     * braces to minimize the number of variables declared as "register."
     */    
    
    s1.i = *( ( Cigi_uint32 *)src);
    s2.i = *( ( Cigi_uint32 *)src + 1);
    
    d1.b[0] = s1.b[3];
    d1.b[1] = s1.b[2];
    d1.b[2] = s1.b[1];
    d1.b[3] = s1.b[0];     
    
    d2.b[0] = s2.b[3];
    d2.b[1] = s2.b[2];
    d2.b[2] = s2.b[1];
    d2.b[3] = s2.b[0];
    
    *( ( Cigi_uint32 *)dest) = d2.i;
    *( ( Cigi_uint32 *)dest + 1) = d1.i;
}

// ====================================================================
// CigiSwap8
// ====================================================================
CIGI_SPEC void CigiCopy8( void *dest, const void *src)
{
   Cigi_uint32 *tDest = (Cigi_uint32 *)dest;
   Cigi_uint32 *tSrc = (Cigi_uint32 *)src;

   *tDest++ = *tSrc++;
   *tDest = *tSrc;
}

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