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 } 98