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// SPDX-License-Identifier: GPL-2.0+
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <common.h>
#include <malloc.h>
#include <linux/stat.h>
#include <linux/time.h>
#include <linux/ctype.h>
#include <asm/byteorder.h>
#include "zfs_common.h"
#include <zfs/zfs.h>
#include <zfs/zio.h>
#include <zfs/dnode.h>
#include <zfs/uberblock_impl.h>
#include <zfs/vdev_impl.h>
#include <zfs/zio_checksum.h>
#include <zfs/zap_impl.h>
#include <zfs/zap_leaf.h>
#include <zfs/zfs_znode.h>
#include <zfs/dmu.h>
#include <zfs/dmu_objset.h>
#include <zfs/dsl_dir.h>
#include <zfs/dsl_dataset.h>
void
fletcher_2_endian(const void *buf, uint64_t size,
zfs_endian_t endian,
zio_cksum_t *zcp)
{
const uint64_t *ip = buf;
const uint64_t *ipend = ip + (size / sizeof(uint64_t));
uint64_t a0, b0, a1, b1;
for (a0 = b0 = a1 = b1 = 0; ip < ipend; ip += 2) {
a0 += zfs_to_cpu64(ip[0], endian);
a1 += zfs_to_cpu64(ip[1], endian);
b0 += a0;
b1 += a1;
}
zcp->zc_word[0] = cpu_to_zfs64(a0, endian);
zcp->zc_word[1] = cpu_to_zfs64(a1, endian);
zcp->zc_word[2] = cpu_to_zfs64(b0, endian);
zcp->zc_word[3] = cpu_to_zfs64(b1, endian);
}
void
fletcher_4_endian(const void *buf, uint64_t size, zfs_endian_t endian,
zio_cksum_t *zcp)
{
const uint32_t *ip = buf;
const uint32_t *ipend = ip + (size / sizeof(uint32_t));
uint64_t a, b, c, d;
for (a = b = c = d = 0; ip < ipend; ip++) {
a += zfs_to_cpu32(ip[0], endian);
b += a;
c += b;
d += c;
}
zcp->zc_word[0] = cpu_to_zfs64(a, endian);
zcp->zc_word[1] = cpu_to_zfs64(b, endian);
zcp->zc_word[2] = cpu_to_zfs64(c, endian);
zcp->zc_word[3] = cpu_to_zfs64(d, endian);
}
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