util.c

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#if !defined(_MSC_VER) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
#include <stdlib.h>
#include <intrin.h>
 
void
byteReverse(unsigned char *buf, unsigned longs)
{
    unsigned int t;
 
    do
    {
#if 0
        t = (unsigned int)((unsigned)buf[3] << 8 | buf[2]) << 16 |
            ((unsigned)buf[1] << 8 | buf[0]);
#else
        t = _byteswap_ulong(*(unsigned int *)buf);
#endif
        *(unsigned int *)buf = t;
        buf += 4;
    } while (--longs);
}
 
#endif // !defined(_MSC_VER) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)