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1/*
2 * LZO decompressor for the Linux kernel. Code borrowed from the lzo
3 * implementation by Markus Franz Xaver Johannes Oberhumer.
4 *
5 * Linux kernel adaptation:
6 * Copyright (C) 2009
7 * Albin Tonnerre, Free Electrons <albin.tonnerre@free-electrons.com>
8 *
9 * Original code:
10 * Copyright (C) 1996-2005 Markus Franz Xaver Johannes Oberhumer
11 * All Rights Reserved.
12 *
13 * lzop and the LZO library are free software; you can redistribute them
14 * and/or modify them under the terms of the GNU General Public License as
15 * published by the Free Software Foundation; either version 2 of
16 * the License, or (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; see the file COPYING.
25 * If not, write to the Free Software Foundation, Inc.,
26 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 *
28 * Markus F.X.J. Oberhumer
29 * <markus@oberhumer.com>
30 * http://www.oberhumer.com/opensource/lzop/
31 */
32
33#ifdef STATIC
34#include "lzo/lzo1x_decompress_safe.c"
35#else
36#include <linux/decompress/unlzo.h>
37#endif
38
39#include <linux/types.h>
40#include <linux/lzo.h>
41#include <linux/decompress/mm.h>
42
43#include <linux/compiler.h>
44#include <asm/unaligned.h>
45
46static const unsigned char lzop_magic[] = {
47 0x89, 0x4c, 0x5a, 0x4f, 0x00, 0x0d, 0x0a, 0x1a, 0x0a };
48
49#define LZO_BLOCK_SIZE (256*1024l)
50#define HEADER_HAS_FILTER 0x00000800L
51#define HEADER_SIZE_MIN (9 + 7 + 4 + 8 + 1 + 4)
52#define HEADER_SIZE_MAX (9 + 7 + 1 + 8 + 8 + 4 + 1 + 255 + 4)
53
54STATIC inline int INIT parse_header(u8 *input, int *skip, int in_len)
55{
56 int l;
57 u8 *parse = input;
58 u8 *end = input + in_len;
59 u8 level = 0;
60 u16 version;
61
62 /*
63 * Check that there's enough input to possibly have a valid header.
64 * Then it is possible to parse several fields until the minimum
65 * size may have been used.
66 */
67 if (in_len < HEADER_SIZE_MIN)
68 return 0;
69
70 /* read magic: 9 first bits */
71 for (l = 0; l < 9; l++) {
72 if (*parse++ != lzop_magic[l])
73 return 0;
74 }
75 /* get version (2bytes), skip library version (2),
76 * 'need to be extracted' version (2) and
77 * method (1) */
78 version = get_unaligned_be16(parse);
79 parse += 7;
80 if (version >= 0x0940)
81 level = *parse++;
82 if (get_unaligned_be32(parse) & HEADER_HAS_FILTER)
83 parse += 8; /* flags + filter info */
84 else
85 parse += 4; /* flags */
86
87 /*
88 * At least mode, mtime_low, filename length, and checksum must
89 * be left to be parsed. If also mtime_high is present, it's OK
90 * because the next input buffer check is after reading the
91 * filename length.
92 */
93 if (end - parse < 8 + 1 + 4)
94 return 0;
95
96 /* skip mode and mtime_low */
97 parse += 8;
98 if (version >= 0x0940)
99 parse += 4; /* skip mtime_high */
100
101 l = *parse++;
102 /* don't care about the file name, and skip checksum */
103 if (end - parse < l + 4)
104 return 0;
105 parse += l + 4;
106
107 *skip = parse - input;
108 return 1;
109}
110
111STATIC inline int INIT unlzo(u8 *input, int in_len,
112 int (*fill) (void *, unsigned int),
113 int (*flush) (void *, unsigned int),
114 u8 *output, int *posp,
115 void (*error) (char *x))
116{
117 u8 r = 0;
118 int skip = 0;
119 u32 src_len, dst_len;
120 size_t tmp;
121 u8 *in_buf, *in_buf_save, *out_buf;
122 int ret = -1;
123
124 if (output) {
125 out_buf = output;
126 } else if (!flush) {
127 error("NULL output pointer and no flush function provided");
128 goto exit;
129 } else {
130 out_buf = malloc(LZO_BLOCK_SIZE);
131 if (!out_buf) {
132 error("Could not allocate output buffer");
133 goto exit;
134 }
135 }
136
137 if (input && fill) {
138 error("Both input pointer and fill function provided, don't know what to do");
139 goto exit_1;
140 } else if (input) {
141 in_buf = input;
142 } else if (!fill) {
143 error("NULL input pointer and missing fill function");
144 goto exit_1;
145 } else {
146 in_buf = malloc(lzo1x_worst_compress(LZO_BLOCK_SIZE));
147 if (!in_buf) {
148 error("Could not allocate input buffer");
149 goto exit_1;
150 }
151 }
152 in_buf_save = in_buf;
153
154 if (posp)
155 *posp = 0;
156
157 if (fill) {
158 /*
159 * Start from in_buf + HEADER_SIZE_MAX to make it possible
160 * to use memcpy() to copy the unused data to the beginning
161 * of the buffer. This way memmove() isn't needed which
162 * is missing from pre-boot environments of most archs.
163 */
164 in_buf += HEADER_SIZE_MAX;
165 in_len = fill(in_buf, HEADER_SIZE_MAX);
166 }
167
168 if (!parse_header(in_buf, &skip, in_len)) {
169 error("invalid header");
170 goto exit_2;
171 }
172 in_buf += skip;
173 in_len -= skip;
174
175 if (fill) {
176 /* Move the unused data to the beginning of the buffer. */
177 memcpy(in_buf_save, in_buf, in_len);
178 in_buf = in_buf_save;
179 }
180
181 if (posp)
182 *posp = skip;
183
184 for (;;) {
185 /* read uncompressed block size */
186 if (fill && in_len < 4) {
187 skip = fill(in_buf + in_len, 4 - in_len);
188 if (skip > 0)
189 in_len += skip;
190 }
191 if (in_len < 4) {
192 error("file corrupted");
193 goto exit_2;
194 }
195 dst_len = get_unaligned_be32(in_buf);
196 in_buf += 4;
197 in_len -= 4;
198
199 /* exit if last block */
200 if (dst_len == 0) {
201 if (posp)
202 *posp += 4;
203 break;
204 }
205
206 if (dst_len > LZO_BLOCK_SIZE) {
207 error("dest len longer than block size");
208 goto exit_2;
209 }
210
211 /* read compressed block size, and skip block checksum info */
212 if (fill && in_len < 8) {
213 skip = fill(in_buf + in_len, 8 - in_len);
214 if (skip > 0)
215 in_len += skip;
216 }
217 if (in_len < 8) {
218 error("file corrupted");
219 goto exit_2;
220 }
221 src_len = get_unaligned_be32(in_buf);
222 in_buf += 8;
223 in_len -= 8;
224
225 if (src_len <= 0 || src_len > dst_len) {
226 error("file corrupted");
227 goto exit_2;
228 }
229
230 /* decompress */
231 if (fill && in_len < src_len) {
232 skip = fill(in_buf + in_len, src_len - in_len);
233 if (skip > 0)
234 in_len += skip;
235 }
236 if (in_len < src_len) {
237 error("file corrupted");
238 goto exit_2;
239 }
240 tmp = dst_len;
241
242 /* When the input data is not compressed at all,
243 * lzo1x_decompress_safe will fail, so call memcpy()
244 * instead */
245 if (unlikely(dst_len == src_len))
246 memcpy(out_buf, in_buf, src_len);
247 else {
248 r = lzo1x_decompress_safe((u8 *) in_buf, src_len,
249 out_buf, &tmp);
250
251 if (r != LZO_E_OK || dst_len != tmp) {
252 error("Compressed data violation");
253 goto exit_2;
254 }
255 }
256
257 if (flush && flush(out_buf, dst_len) != dst_len)
258 goto exit_2;
259 if (output)
260 out_buf += dst_len;
261 if (posp)
262 *posp += src_len + 12;
263
264 in_buf += src_len;
265 in_len -= src_len;
266 if (fill) {
267 /*
268 * If there happens to still be unused data left in
269 * in_buf, move it to the beginning of the buffer.
270 * Use a loop to avoid memmove() dependency.
271 */
272 if (in_len > 0)
273 for (skip = 0; skip < in_len; ++skip)
274 in_buf_save[skip] = in_buf[skip];
275 in_buf = in_buf_save;
276 }
277 }
278
279 ret = 0;
280exit_2:
281 if (!input)
282 free(in_buf_save);
283exit_1:
284 if (!output)
285 free(out_buf);
286exit:
287 return ret;
288}
289
290#define decompress unlzo
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * LZO decompressor for the Linux kernel. Code borrowed from the lzo
4 * implementation by Markus Franz Xaver Johannes Oberhumer.
5 *
6 * Linux kernel adaptation:
7 * Copyright (C) 2009
8 * Albin Tonnerre, Free Electrons <albin.tonnerre@free-electrons.com>
9 *
10 * Original code:
11 * Copyright (C) 1996-2005 Markus Franz Xaver Johannes Oberhumer
12 * All Rights Reserved.
13 *
14 * Markus F.X.J. Oberhumer
15 * <markus@oberhumer.com>
16 * http://www.oberhumer.com/opensource/lzop/
17 */
18
19#ifdef STATIC
20#define PREBOOT
21#include "lzo/lzo1x_decompress_safe.c"
22#else
23#include <linux/decompress/unlzo.h>
24#endif
25
26#include <linux/types.h>
27#include <linux/lzo.h>
28#include <linux/decompress/mm.h>
29
30#include <linux/compiler.h>
31#include <linux/unaligned.h>
32
33static const unsigned char lzop_magic[] = {
34 0x89, 0x4c, 0x5a, 0x4f, 0x00, 0x0d, 0x0a, 0x1a, 0x0a };
35
36#define LZO_BLOCK_SIZE (256*1024l)
37#define HEADER_HAS_FILTER 0x00000800L
38#define HEADER_SIZE_MIN (9 + 7 + 4 + 8 + 1 + 4)
39#define HEADER_SIZE_MAX (9 + 7 + 1 + 8 + 8 + 4 + 1 + 255 + 4)
40
41STATIC inline long INIT parse_header(u8 *input, long *skip, long in_len)
42{
43 int l;
44 u8 *parse = input;
45 u8 *end = input + in_len;
46 u16 version;
47
48 /*
49 * Check that there's enough input to possibly have a valid header.
50 * Then it is possible to parse several fields until the minimum
51 * size may have been used.
52 */
53 if (in_len < HEADER_SIZE_MIN)
54 return 0;
55
56 /* read magic: 9 first bits */
57 for (l = 0; l < 9; l++) {
58 if (*parse++ != lzop_magic[l])
59 return 0;
60 }
61 /* get version (2bytes), skip library version (2),
62 * 'need to be extracted' version (2) and
63 * method (1) */
64 version = get_unaligned_be16(parse);
65 parse += 7;
66 if (version >= 0x0940)
67 parse++;
68 if (get_unaligned_be32(parse) & HEADER_HAS_FILTER)
69 parse += 8; /* flags + filter info */
70 else
71 parse += 4; /* flags */
72
73 /*
74 * At least mode, mtime_low, filename length, and checksum must
75 * be left to be parsed. If also mtime_high is present, it's OK
76 * because the next input buffer check is after reading the
77 * filename length.
78 */
79 if (end - parse < 8 + 1 + 4)
80 return 0;
81
82 /* skip mode and mtime_low */
83 parse += 8;
84 if (version >= 0x0940)
85 parse += 4; /* skip mtime_high */
86
87 l = *parse++;
88 /* don't care about the file name, and skip checksum */
89 if (end - parse < l + 4)
90 return 0;
91 parse += l + 4;
92
93 *skip = parse - input;
94 return 1;
95}
96
97STATIC int INIT unlzo(u8 *input, long in_len,
98 long (*fill)(void *, unsigned long),
99 long (*flush)(void *, unsigned long),
100 u8 *output, long *posp,
101 void (*error) (char *x))
102{
103 u8 r = 0;
104 long skip = 0;
105 u32 src_len, dst_len;
106 size_t tmp;
107 u8 *in_buf, *in_buf_save, *out_buf;
108 int ret = -1;
109
110 if (output) {
111 out_buf = output;
112 } else if (!flush) {
113 error("NULL output pointer and no flush function provided");
114 goto exit;
115 } else {
116 out_buf = malloc(LZO_BLOCK_SIZE);
117 if (!out_buf) {
118 error("Could not allocate output buffer");
119 goto exit;
120 }
121 }
122
123 if (input && fill) {
124 error("Both input pointer and fill function provided, don't know what to do");
125 goto exit_1;
126 } else if (input) {
127 in_buf = input;
128 } else if (!fill) {
129 error("NULL input pointer and missing fill function");
130 goto exit_1;
131 } else {
132 in_buf = malloc(lzo1x_worst_compress(LZO_BLOCK_SIZE));
133 if (!in_buf) {
134 error("Could not allocate input buffer");
135 goto exit_1;
136 }
137 }
138 in_buf_save = in_buf;
139
140 if (posp)
141 *posp = 0;
142
143 if (fill) {
144 /*
145 * Start from in_buf + HEADER_SIZE_MAX to make it possible
146 * to use memcpy() to copy the unused data to the beginning
147 * of the buffer. This way memmove() isn't needed which
148 * is missing from pre-boot environments of most archs.
149 */
150 in_buf += HEADER_SIZE_MAX;
151 in_len = fill(in_buf, HEADER_SIZE_MAX);
152 }
153
154 if (!parse_header(in_buf, &skip, in_len)) {
155 error("invalid header");
156 goto exit_2;
157 }
158 in_buf += skip;
159 in_len -= skip;
160
161 if (fill) {
162 /* Move the unused data to the beginning of the buffer. */
163 memcpy(in_buf_save, in_buf, in_len);
164 in_buf = in_buf_save;
165 }
166
167 if (posp)
168 *posp = skip;
169
170 for (;;) {
171 /* read uncompressed block size */
172 if (fill && in_len < 4) {
173 skip = fill(in_buf + in_len, 4 - in_len);
174 if (skip > 0)
175 in_len += skip;
176 }
177 if (in_len < 4) {
178 error("file corrupted");
179 goto exit_2;
180 }
181 dst_len = get_unaligned_be32(in_buf);
182 in_buf += 4;
183 in_len -= 4;
184
185 /* exit if last block */
186 if (dst_len == 0) {
187 if (posp)
188 *posp += 4;
189 break;
190 }
191
192 if (dst_len > LZO_BLOCK_SIZE) {
193 error("dest len longer than block size");
194 goto exit_2;
195 }
196
197 /* read compressed block size, and skip block checksum info */
198 if (fill && in_len < 8) {
199 skip = fill(in_buf + in_len, 8 - in_len);
200 if (skip > 0)
201 in_len += skip;
202 }
203 if (in_len < 8) {
204 error("file corrupted");
205 goto exit_2;
206 }
207 src_len = get_unaligned_be32(in_buf);
208 in_buf += 8;
209 in_len -= 8;
210
211 if (src_len <= 0 || src_len > dst_len) {
212 error("file corrupted");
213 goto exit_2;
214 }
215
216 /* decompress */
217 if (fill && in_len < src_len) {
218 skip = fill(in_buf + in_len, src_len - in_len);
219 if (skip > 0)
220 in_len += skip;
221 }
222 if (in_len < src_len) {
223 error("file corrupted");
224 goto exit_2;
225 }
226 tmp = dst_len;
227
228 /* When the input data is not compressed at all,
229 * lzo1x_decompress_safe will fail, so call memcpy()
230 * instead */
231 if (unlikely(dst_len == src_len))
232 memcpy(out_buf, in_buf, src_len);
233 else {
234 r = lzo1x_decompress_safe((u8 *) in_buf, src_len,
235 out_buf, &tmp);
236
237 if (r != LZO_E_OK || dst_len != tmp) {
238 error("Compressed data violation");
239 goto exit_2;
240 }
241 }
242
243 if (flush && flush(out_buf, dst_len) != dst_len)
244 goto exit_2;
245 if (output)
246 out_buf += dst_len;
247 if (posp)
248 *posp += src_len + 12;
249
250 in_buf += src_len;
251 in_len -= src_len;
252 if (fill) {
253 /*
254 * If there happens to still be unused data left in
255 * in_buf, move it to the beginning of the buffer.
256 * Use a loop to avoid memmove() dependency.
257 */
258 if (in_len > 0)
259 for (skip = 0; skip < in_len; ++skip)
260 in_buf_save[skip] = in_buf[skip];
261 in_buf = in_buf_save;
262 }
263 }
264
265 ret = 0;
266exit_2:
267 if (!input)
268 free(in_buf_save);
269exit_1:
270 if (!output)
271 free(out_buf);
272exit:
273 return ret;
274}
275
276#ifdef PREBOOT
277STATIC int INIT __decompress(unsigned char *buf, long len,
278 long (*fill)(void*, unsigned long),
279 long (*flush)(void*, unsigned long),
280 unsigned char *out_buf, long olen,
281 long *pos,
282 void (*error)(char *x))
283{
284 return unlzo(buf, len, fill, flush, out_buf, pos, error);
285}
286#endif