arch/all-pc/boot/grub2-aros/grub-core/fs/zfs/zfs_fletcher.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 1999,2000,2001,2002,2003,2004,2009  Free Software Foundation, Inc.
   4  *  Copyright 2007 Sun Microsystems, Inc.
   5  *
   6  *  GRUB is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <grub/err.h>
  21 #include <grub/file.h>
  22 #include <grub/mm.h>
  23 #include <grub/misc.h>
  24 #include <grub/disk.h>
  25 #include <grub/dl.h>
  26 #include <grub/types.h>
  27 #include <grub/zfs/zfs.h>
  28 #include <grub/zfs/zio.h>
  29 #include <grub/zfs/dnode.h>
  30 #include <grub/zfs/uberblock_impl.h>
  31 #include <grub/zfs/vdev_impl.h>
  32 #include <grub/zfs/zio_checksum.h>
  33 #include <grub/zfs/zap_impl.h>
  34 #include <grub/zfs/zap_leaf.h>
  35 #include <grub/zfs/zfs_znode.h>
  36 #include <grub/zfs/dmu.h>
  37 #include <grub/zfs/dmu_objset.h>
  38 #include <grub/zfs/dsl_dir.h>
  39 #include <grub/zfs/dsl_dataset.h>
  40
  41 void
  42 fletcher_2(const void *buf, grub_uint64_t size, grub_zfs_endian_t endian,
  43            zio_cksum_t *zcp)
  44 {
  45   const grub_uint64_t *ip = buf;
  46   const grub_uint64_t *ipend = ip + (size / sizeof (grub_uint64_t));
  47   grub_uint64_t a0, b0, a1, b1;
  48
  49   for (a0 = b0 = a1 = b1 = 0; ip < ipend; ip += 2)
  50     {
  51       a0 += grub_zfs_to_cpu64 (ip[0], endian);
  52       a1 += grub_zfs_to_cpu64 (ip[1], endian);
  53       b0 += a0;
  54       b1 += a1;
  55     }
  56
  57   zcp->zc_word[0] = grub_cpu_to_zfs64 (a0, endian);
  58   zcp->zc_word[1] = grub_cpu_to_zfs64 (a1, endian);
  59   zcp->zc_word[2] = grub_cpu_to_zfs64 (b0, endian);
  60   zcp->zc_word[3] = grub_cpu_to_zfs64 (b1, endian);
  61 }
  62
  63 void
  64 fletcher_4 (const void *buf, grub_uint64_t size, grub_zfs_endian_t endian,
  65             zio_cksum_t *zcp)
  66 {
  67   const grub_uint32_t *ip = buf;
  68   const grub_uint32_t *ipend = ip + (size / sizeof (grub_uint32_t));
  69   grub_uint64_t a, b, c, d;
  70
  71   for (a = b = c = d = 0; ip < ipend; ip++)
  72     {
  73       a += grub_zfs_to_cpu32 (ip[0], endian);;
  74       b += a;
  75       c += b;
  76       d += c;
  77     }
  78
  79   zcp->zc_word[0] = grub_cpu_to_zfs64 (a, endian);
  80   zcp->zc_word[1] = grub_cpu_to_zfs64 (b, endian);
  81   zcp->zc_word[2] = grub_cpu_to_zfs64 (c, endian);
  82   zcp->zc_word[3] = grub_cpu_to_zfs64 (d, endian);
  83 }
  84