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/*
* Copyright (c) International Business Machines Corp., 2014
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdint.h>
#include "assert.h"
#include "checksum.h"
uint32_t memcpy_checksum(void *__restrict __dst, const void *__restrict __src,
size_t __n)
{
uint8_t sum[4] = { 0, };
/* assert(((uintptr_t)__src & 3) == 0); */
size_t i;
if (__dst == NULL)
for (i = 0; i < __n; i++)
sum[i & 3] ^= ((uint8_t *) __src)[i];
else
for (i = 0; i < __n; i++)
sum[i & 3] ^= ((uint8_t *) __src)[i],
((uint8_t *) __dst)[i] = ((uint8_t *) __src)[i];
return (sum[0] << 24) | (sum[1] << 16) | (sum[2] << 8) | sum[3];
}
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