| /* |
| * GRUB -- GRand Unified Bootloader |
| * Copyright (C) 1999,2000,2001,2002,2003,2004,2009 Free Software Foundation, Inc. |
| * Copyright 2007 Sun Microsystems, Inc. |
| * |
| * GRUB 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 3 of the License, or |
| * (at your option) any later version. |
| * |
| * GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <grub/err.h> |
| #include <grub/file.h> |
| #include <grub/mm.h> |
| #include <grub/misc.h> |
| #include <grub/disk.h> |
| #include <grub/dl.h> |
| #include <grub/types.h> |
| #include <grub/zfs/zfs.h> |
| #include <grub/zfs/zio.h> |
| #include <grub/zfs/dnode.h> |
| #include <grub/zfs/uberblock_impl.h> |
| #include <grub/zfs/vdev_impl.h> |
| #include <grub/zfs/zio_checksum.h> |
| #include <grub/zfs/zap_impl.h> |
| #include <grub/zfs/zap_leaf.h> |
| #include <grub/zfs/zfs_znode.h> |
| #include <grub/zfs/dmu.h> |
| #include <grub/zfs/dmu_objset.h> |
| #include <grub/zfs/dsl_dir.h> |
| #include <grub/zfs/dsl_dataset.h> |
| |
| #define MATCH_BITS 6 |
| #define MATCH_MIN 3 |
| #define OFFSET_MASK ((1 << (16 - MATCH_BITS)) - 1) |
| |
| /* |
| * Decompression Entry - lzjb |
| */ |
| #ifndef NBBY |
| #define NBBY 8 |
| #endif |
| |
| grub_err_t |
| lzjb_decompress (void *s_start, void *d_start, grub_size_t s_len, |
| grub_size_t d_len); |
| |
| grub_err_t |
| lzjb_decompress (void *s_start, void *d_start, grub_size_t s_len, |
| grub_size_t d_len) |
| { |
| grub_uint8_t *src = s_start; |
| grub_uint8_t *dst = d_start; |
| grub_uint8_t *d_end = (grub_uint8_t *) d_start + d_len; |
| grub_uint8_t *s_end = (grub_uint8_t *) s_start + s_len; |
| grub_uint8_t *cpy, copymap = 0; |
| int copymask = 1 << (NBBY - 1); |
| |
| while (dst < d_end && src < s_end) |
| { |
| if ((copymask <<= 1) == (1 << NBBY)) |
| { |
| copymask = 1; |
| copymap = *src++; |
| } |
| if (src >= s_end) |
| return grub_error (GRUB_ERR_BAD_FS, "lzjb decompression failed"); |
| if (copymap & copymask) |
| { |
| int mlen = (src[0] >> (NBBY - MATCH_BITS)) + MATCH_MIN; |
| int offset = ((src[0] << NBBY) | src[1]) & OFFSET_MASK; |
| src += 2; |
| cpy = dst - offset; |
| if (src > s_end || cpy < (grub_uint8_t *) d_start) |
| return grub_error (GRUB_ERR_BAD_FS, "lzjb decompression failed"); |
| while (--mlen >= 0 && dst < d_end) |
| *dst++ = *cpy++; |
| } |
| else |
| *dst++ = *src++; |
| } |
| if (dst < d_end) |
| return grub_error (GRUB_ERR_BAD_FS, "lzjb decompression failed"); |
| return GRUB_ERR_NONE; |
| } |