| Jorgen Lundman | 4d3c95f | 2012-07-19 20:48:25 +0000 | [diff] [blame] | 1 | /* |
| 2 | * GRUB -- GRand Unified Bootloader |
| 3 | * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 18 | */ |
| 19 | /* |
| 20 | * Copyright 2007 Sun Microsystems, Inc. All rights reserved. |
| 21 | * Use is subject to license terms. |
| 22 | */ |
| 23 | |
| 24 | #include <common.h> |
| 25 | #include <malloc.h> |
| 26 | #include <linux/stat.h> |
| 27 | #include <linux/time.h> |
| 28 | #include <linux/ctype.h> |
| 29 | #include <asm/byteorder.h> |
| 30 | #include "zfs_common.h" |
| 31 | |
| 32 | #include <zfs/zfs.h> |
| 33 | #include <zfs/zio.h> |
| 34 | #include <zfs/dnode.h> |
| 35 | #include <zfs/uberblock_impl.h> |
| 36 | #include <zfs/vdev_impl.h> |
| 37 | #include <zfs/zio_checksum.h> |
| 38 | #include <zfs/zap_impl.h> |
| 39 | #include <zfs/zap_leaf.h> |
| 40 | #include <zfs/zfs_znode.h> |
| 41 | #include <zfs/dmu.h> |
| 42 | #include <zfs/dmu_objset.h> |
| 43 | #include <zfs/dsl_dir.h> |
| 44 | #include <zfs/dsl_dataset.h> |
| 45 | |
| 46 | #define MATCH_BITS 6 |
| 47 | #define MATCH_MIN 3 |
| 48 | #define OFFSET_MASK ((1 << (16 - MATCH_BITS)) - 1) |
| 49 | |
| 50 | /* |
| 51 | * Decompression Entry - lzjb |
| 52 | */ |
| 53 | #ifndef NBBY |
| 54 | #define NBBY 8 |
| 55 | #endif |
| 56 | |
| 57 | int |
| 58 | lzjb_decompress(void *s_start, void *d_start, uint32_t s_len, |
| 59 | uint32_t d_len) |
| 60 | { |
| 61 | uint8_t *src = s_start; |
| 62 | uint8_t *dst = d_start; |
| 63 | uint8_t *d_end = (uint8_t *) d_start + d_len; |
| 64 | uint8_t *s_end = (uint8_t *) s_start + s_len; |
| 65 | uint8_t *cpy, copymap = 0; |
| 66 | int copymask = 1 << (NBBY - 1); |
| 67 | |
| 68 | while (dst < d_end && src < s_end) { |
| 69 | if ((copymask <<= 1) == (1 << NBBY)) { |
| 70 | copymask = 1; |
| 71 | copymap = *src++; |
| 72 | } |
| 73 | if (src >= s_end) { |
| 74 | printf("lzjb decompression failed\n"); |
| 75 | return ZFS_ERR_BAD_FS; |
| 76 | } |
| 77 | if (copymap & copymask) { |
| 78 | int mlen = (src[0] >> (NBBY - MATCH_BITS)) + MATCH_MIN; |
| 79 | int offset = ((src[0] << NBBY) | src[1]) & OFFSET_MASK; |
| 80 | src += 2; |
| 81 | cpy = dst - offset; |
| 82 | if (src > s_end || cpy < (uint8_t *) d_start) { |
| 83 | printf("lzjb decompression failed\n"); |
| 84 | return ZFS_ERR_BAD_FS; |
| 85 | } |
| 86 | while (--mlen >= 0 && dst < d_end) |
| 87 | *dst++ = *cpy++; |
| 88 | } else { |
| 89 | *dst++ = *src++; |
| 90 | } |
| 91 | } |
| 92 | if (dst < d_end) { |
| 93 | printf("lzjb decompression failed\n"); |
| 94 | return ZFS_ERR_BAD_FS; |
| 95 | } |
| 96 | return ZFS_ERR_NONE; |
| 97 | } |