ia64/xen-unstable

view tools/libfsimage/zfs/zfs_lzjb.c @ 19648:f0e2df69a8eb

x86 hvm: Allow cross-vendor migration

Intercept #UD and emulate SYSCALL/SYSENTER/SYSEXIT as necessary.

Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue May 26 15:01:36 2009 +0100 (2009-05-26)
parents 64f790e90d3d
children
line source
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 */
24 #include "fsys_zfs.h"
26 #define MATCH_BITS 6
27 #define MATCH_MIN 3
28 #define OFFSET_MASK ((1 << (16 - MATCH_BITS)) - 1)
31 /*ARGSUSED*/
32 int
33 lzjb_decompress(void *s_start, void *d_start, size_t s_len, size_t d_len)
34 {
35 unsigned char *src = s_start;
36 unsigned char *dst = d_start;
37 unsigned char *d_end = (unsigned char *)d_start + d_len;
38 unsigned char *cpy;
39 unsigned char copymap = '\0';
40 int copymask = 1 << (NBBY - 1);
42 while (dst < d_end) {
43 if ((copymask <<= 1) == (1 << NBBY)) {
44 copymask = 1;
45 copymap = *src++;
46 }
47 if (copymap & (unsigned char)copymask) {
48 int mlen = (src[0] >> (NBBY - MATCH_BITS)) + MATCH_MIN;
49 int offset = ((src[0] << NBBY) | src[1]) & OFFSET_MASK;
50 src += 2;
51 if ((cpy = dst - offset) < (unsigned char *)d_start)
52 return (-1);
53 while (--mlen >= 0 && dst < d_end)
54 *dst++ = *cpy++;
55 } else {
56 *dst++ = *src++;
57 }
58 }
59 return (0);
60 }