mirror of
https://git.proxmox.com/git/grub2
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94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2004,2009 Free Software Foundation, Inc.
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* Copyright 2007 Sun Microsystems, Inc.
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*
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* GRUB is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/err.h>
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#include <grub/file.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/disk.h>
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#include <grub/dl.h>
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#include <grub/types.h>
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#include <grub/zfs/zfs.h>
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#include <grub/zfs/zio.h>
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#include <grub/zfs/dnode.h>
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#include <grub/zfs/uberblock_impl.h>
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#include <grub/zfs/vdev_impl.h>
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#include <grub/zfs/zio_checksum.h>
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#include <grub/zfs/zap_impl.h>
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#include <grub/zfs/zap_leaf.h>
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#include <grub/zfs/zfs_znode.h>
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#include <grub/zfs/dmu.h>
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#include <grub/zfs/dmu_objset.h>
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#include <grub/zfs/dsl_dir.h>
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#include <grub/zfs/dsl_dataset.h>
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#define MATCH_BITS 6
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#define MATCH_MIN 3
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#define OFFSET_MASK ((1 << (16 - MATCH_BITS)) - 1)
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/*
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* Decompression Entry - lzjb
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*/
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#ifndef NBBY
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#define NBBY 8
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#endif
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grub_err_t
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lzjb_decompress (void *s_start, void *d_start, grub_size_t s_len,
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grub_size_t d_len);
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grub_err_t
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lzjb_decompress (void *s_start, void *d_start, grub_size_t s_len,
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grub_size_t d_len)
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{
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grub_uint8_t *src = s_start;
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grub_uint8_t *dst = d_start;
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grub_uint8_t *d_end = (grub_uint8_t *) d_start + d_len;
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grub_uint8_t *s_end = (grub_uint8_t *) s_start + s_len;
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grub_uint8_t *cpy, copymap = 0;
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int copymask = 1 << (NBBY - 1);
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while (dst < d_end && src < s_end)
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{
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if ((copymask <<= 1) == (1 << NBBY))
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{
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copymask = 1;
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copymap = *src++;
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}
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if (src >= s_end)
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return grub_error (GRUB_ERR_BAD_FS, "lzjb decompression failed");
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if (copymap & copymask)
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{
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int mlen = (src[0] >> (NBBY - MATCH_BITS)) + MATCH_MIN;
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int offset = ((src[0] << NBBY) | src[1]) & OFFSET_MASK;
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src += 2;
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cpy = dst - offset;
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if (src > s_end || cpy < (grub_uint8_t *) d_start)
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return grub_error (GRUB_ERR_BAD_FS, "lzjb decompression failed");
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while (--mlen >= 0 && dst < d_end)
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*dst++ = *cpy++;
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}
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else
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*dst++ = *src++;
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}
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if (dst < d_end)
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return grub_error (GRUB_ERR_BAD_FS, "lzjb decompression failed");
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return GRUB_ERR_NONE;
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}
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