1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
/*
* LZO decompressor for barebox. Code borrowed from the lzo
* implementation by Markus Franz Xaver Johannes Oberhumer.
*
* Linux kernel adaptation:
* Copyright (C) 2009
* Albin Tonnerre, Free Electrons <albin.tonnerre@free-electrons.com>
*
* Original code:
* Copyright (C) 1996-2005 Markus Franz Xaver Johannes Oberhumer
* All Rights Reserved.
*
* lzop and the LZO library are free software; you can redistribute them
* and/or modify them under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program 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 this program; see the file COPYING.
* If not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Markus F.X.J. Oberhumer
* <markus@oberhumer.com>
* http://www.oberhumer.com/opensource/lzop/
*/
#include <common.h>
#include <malloc.h>
#include <linux/types.h>
#include <lzo.h>
#include <errno.h>
#include <fs.h>
#include <xfuncs.h>
#include <linux/compiler.h>
#include <asm/unaligned.h>
static const unsigned char lzop_magic[] = {
0x89, 0x4c, 0x5a, 0x4f, 0x00, 0x0d, 0x0a, 0x1a, 0x0a };
#define LZO_BLOCK_SIZE (256*1024l)
#define HEADER_HAS_FILTER 0x00000800L
static inline int parse_header(u8 *input, u8 *skip)
{
int l;
u8 *parse = input;
u8 level = 0;
u16 version;
/* read magic: 9 first bits */
for (l = 0; l < 9; l++) {
if (*parse++ != lzop_magic[l])
return 0;
}
/* get version (2bytes), skip library version (2),
* 'need to be extracted' version (2) and
* method (1) */
version = get_unaligned_be16(parse);
parse += 7;
if (version >= 0x0940)
level = *parse++;
if (get_unaligned_be32(parse) & HEADER_HAS_FILTER)
parse += 8; /* flags + filter info */
else
parse += 4; /* flags */
/* skip mode and mtime_low */
parse += 8;
if (version >= 0x0940)
parse += 4; /* skip mtime_high */
l = *parse++;
/* don't care about the file name, and skip checksum */
parse += l + 4;
*skip = parse - input;
return 1;
}
static int __unlzo(int *dest_len,
int (*fill) (void *, unsigned int),
int (*flush) (void *, unsigned int))
{
u8 skip = 0, r = 0;
u32 src_len, dst_len;
size_t tmp;
u8 *in_buf, *in_buf_save, *out_buf, *out_buf_save;
int obytes_processed = 0;
int ret = -1;
out_buf = xmalloc(LZO_BLOCK_SIZE);
in_buf = xmalloc(lzo1x_worst_compress(LZO_BLOCK_SIZE));
in_buf_save = in_buf;
out_buf_save = out_buf;
ret = fill(in_buf, lzo1x_worst_compress(LZO_BLOCK_SIZE));
if (ret < 0)
goto exit_free;
if (!parse_header(in_buf, &skip))
return -EINVAL;
in_buf += skip;
for (;;) {
/* read uncompressed block size */
dst_len = get_unaligned_be32(in_buf);
in_buf += 4;
/* exit if last block */
if (dst_len == 0)
break;
if (dst_len > LZO_BLOCK_SIZE) {
printf("dest len longer than block size");
goto exit_free;
}
/* read compressed block size, and skip block checksum info */
src_len = get_unaligned_be32(in_buf);
in_buf += 8;
if (src_len <= 0 || src_len > dst_len) {
printf("file corrupted");
goto exit_free;
}
/* decompress */
tmp = dst_len;
/* When the input data is not compressed at all,
* lzo1x_decompress_safe will fail, so call memcpy()
* instead */
if (unlikely(dst_len == src_len)) {
if (src_len != dst_len) {
printf("Compressed data violation");
goto exit_free;
}
out_buf = in_buf;
} else {
r = lzo1x_decompress_safe((u8 *) in_buf, src_len,
out_buf, &tmp);
if (r != LZO_E_OK || dst_len != tmp) {
printf("Compressed data violation");
goto exit_free;
}
}
ret = flush(out_buf, dst_len);
if (ret < 0)
goto exit_free;
out_buf = in_buf + src_len;
in_buf = in_buf_save;
ret = fill(in_buf, lzo1x_worst_compress(LZO_BLOCK_SIZE));
if (ret < 0)
goto exit_free;
if (ret == 0)
in_buf = out_buf;
out_buf = out_buf_save;
obytes_processed += dst_len;
}
exit_free:
free(in_buf);
free(out_buf);
*dest_len = obytes_processed;
return 0;
}
static int in_fd;
static int out_fd;
static int unlzo_fill(void *buf, unsigned int len)
{
return read(in_fd, buf, len);
}
static int unlzo_flush(void *buf, unsigned int len)
{
return write(out_fd, buf, len);
}
int unlzo(int _in_fd, int _out_fd, int *dest_len)
{
in_fd = _in_fd;
out_fd = _out_fd;
return __unlzo(dest_len, unlzo_fill, unlzo_flush);
}
|
