endian_utils.c

説明を見る。

/*------------------------------------------------------------------------*/
/* ヘッダファイル */
#include <string.h>
#include "utils/endian_utils.h"


#pragma mark -
/*------------------------------------------------------------------------*/
double swapd(double d)
{
    uint64_t    tmp = 0;

    memcpy(&tmp, &d, sizeof(d));
    tmp = (tmp >> 32) | (tmp << 32);
    tmp = ((tmp & 0xff00ff00ff00ff00ULL) >> 8) | ((tmp & 0x00ff00ff00ff00ffULL) << 8);
    tmp = ((tmp & 0xffff0000ffff0000ULL) >> 16) | ((tmp & 0x0000ffff0000ffffULL) << 16);
    memcpy(&d, &tmp, sizeof(d));

    return d;
}

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