source: MondoRescue/branches/2.2.9/mindi-busybox/archival/lzop.c@ 2725

Last change on this file since 2725 was 2725, checked in by Bruno Cornec, 13 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
  • Property svn:eol-style set to native
File size: 26.2 KB
Line 
1/*
2 This file is part of the lzop file compressor.
3
4 Copyright (C) 1996..2003 Markus Franz Xaver Johannes Oberhumer
5 All Rights Reserved.
6
7 Markus F.X.J. Oberhumer <markus@oberhumer.com>
8 http://www.oberhumer.com/opensource/lzop/
9
10 lzop and the LZO library are free software; you can redistribute them
11 and/or modify them under the terms of the GNU General Public License as
12 published by the Free Software Foundation; either version 2 of
13 the License, or (at your option) any later version.
14
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with this program; see the file COPYING.
22 If not, write to the Free Software Foundation, Inc.,
23 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24
25 "Minimalized" for busybox by Alain Knaff
26*/
27
28#include "libbb.h"
29#include "archive.h"
30#include "liblzo_interface.h"
31
32/* lzo-2.03/src/lzo_ptr.h */
33#define pd(a,b) ((unsigned)((a)-(b)))
34
35#define lzo_version() LZO_VERSION
36#define lzo_sizeof_dict_t (sizeof(uint8_t*))
37
38/* lzo-2.03/include/lzo/lzo1x.h */
39#define LZO1X_1_MEM_COMPRESS (16384 * lzo_sizeof_dict_t)
40#define LZO1X_1_15_MEM_COMPRESS (32768 * lzo_sizeof_dict_t)
41#define LZO1X_999_MEM_COMPRESS (14 * 16384 * sizeof(short))
42
43/* lzo-2.03/src/lzo1x_oo.c */
44#define NO_LIT UINT_MAX
45
46/**********************************************************************/
47static void copy2(uint8_t* ip, const uint8_t* m_pos, unsigned off)
48{
49 ip[0] = m_pos[0];
50 if (off == 1)
51 ip[1] = m_pos[0];
52 else
53 ip[1] = m_pos[1];
54}
55
56static void copy3(uint8_t* ip, const uint8_t* m_pos, unsigned off)
57{
58 ip[0] = m_pos[0];
59 if (off == 1) {
60 ip[2] = ip[1] = m_pos[0];
61 }
62 else if (off == 2) {
63 ip[1] = m_pos[1];
64 ip[2] = m_pos[0];
65 }
66 else {
67 ip[1] = m_pos[1];
68 ip[2] = m_pos[2];
69 }
70}
71
72/**********************************************************************/
73// optimize a block of data.
74/**********************************************************************/
75#define TEST_IP (ip < ip_end)
76#define TEST_OP (op <= op_end)
77
78static NOINLINE int lzo1x_optimize(uint8_t *in, unsigned in_len,
79 uint8_t *out, unsigned *out_len,
80 void* wrkmem UNUSED_PARAM)
81{
82 uint8_t* op;
83 uint8_t* ip;
84 unsigned t;
85 uint8_t* m_pos;
86 uint8_t* const ip_end = in + in_len;
87 uint8_t* const op_end = out + *out_len;
88 uint8_t* litp = NULL;
89 unsigned lit = 0;
90 unsigned next_lit = NO_LIT;
91 unsigned nl;
92 unsigned long o_m1_a = 0, o_m1_b = 0, o_m2 = 0, o_m3_a = 0, o_m3_b = 0;
93
94// LZO_UNUSED(wrkmem);
95
96 *out_len = 0;
97
98 op = out;
99 ip = in;
100
101 if (*ip > 17) {
102 t = *ip++ - 17;
103 if (t < 4)
104 goto match_next;
105 goto first_literal_run;
106 }
107
108 while (TEST_IP && TEST_OP) {
109 t = *ip++;
110 if (t >= 16)
111 goto match;
112 /* a literal run */
113 litp = ip - 1;
114 if (t == 0) {
115 t = 15;
116 while (*ip == 0)
117 t += 255, ip++;
118 t += *ip++;
119 }
120 lit = t + 3;
121 /* copy literals */
122 copy_literal_run:
123 *op++ = *ip++;
124 *op++ = *ip++;
125 *op++ = *ip++;
126 first_literal_run:
127 do *op++ = *ip++; while (--t > 0);
128
129 t = *ip++;
130
131 if (t >= 16)
132 goto match;
133#if defined(LZO1X)
134 m_pos = op - 1 - 0x800;
135#elif defined(LZO1Y)
136 m_pos = op - 1 - 0x400;
137#endif
138 m_pos -= t >> 2;
139 m_pos -= *ip++ << 2;
140 *op++ = *m_pos++;
141 *op++ = *m_pos++;
142 *op++ = *m_pos++;
143 lit = 0;
144 goto match_done;
145
146
147 /* handle matches */
148 do {
149 if (t < 16) { /* a M1 match */
150 m_pos = op - 1;
151 m_pos -= t >> 2;
152 m_pos -= *ip++ << 2;
153
154 if (litp == NULL)
155 goto copy_m1;
156
157 nl = ip[-2] & 3;
158 /* test if a match follows */
159 if (nl == 0 && lit == 1 && ip[0] >= 16) {
160 next_lit = nl;
161 /* adjust length of previous short run */
162 lit += 2;
163 *litp = (unsigned char)((*litp & ~3) | lit);
164 /* copy over the 2 literals that replace the match */
165 copy2(ip-2, m_pos, pd(op, m_pos));
166 o_m1_a++;
167 }
168 /* test if a literal run follows */
169 else
170 if (nl == 0
171 && ip[0] < 16
172 && ip[0] != 0
173 && (lit + 2 + ip[0] < 16)
174 ) {
175 t = *ip++;
176 /* remove short run */
177 *litp &= ~3;
178 /* copy over the 2 literals that replace the match */
179 copy2(ip-3+1,m_pos,pd(op,m_pos));
180 /* move literals 1 byte ahead */
181 litp += 2;
182 if (lit > 0)
183 memmove(litp+1, litp, lit);
184 /* insert new length of long literal run */
185 lit += 2 + t + 3;
186 *litp = (unsigned char)(lit - 3);
187
188 o_m1_b++;
189 *op++ = *m_pos++; *op++ = *m_pos++;
190 goto copy_literal_run;
191 }
192 copy_m1:
193 *op++ = *m_pos++;
194 *op++ = *m_pos++;
195 } else {
196 match:
197 if (t >= 64) { /* a M2 match */
198 m_pos = op - 1;
199#if defined(LZO1X)
200 m_pos -= (t >> 2) & 7;
201 m_pos -= *ip++ << 3;
202 t = (t >> 5) - 1;
203#elif defined(LZO1Y)
204 m_pos -= (t >> 2) & 3;
205 m_pos -= *ip++ << 2;
206 t = (t >> 4) - 3;
207#endif
208 if (litp == NULL)
209 goto copy_m;
210
211 nl = ip[-2] & 3;
212 /* test if in beetween two long literal runs */
213 if (t == 1 && lit > 3 && nl == 0
214 && ip[0] < 16 && ip[0] != 0 && (lit + 3 + ip[0] < 16)
215 ) {
216 t = *ip++;
217 /* copy over the 3 literals that replace the match */
218 copy3(ip-1-2,m_pos,pd(op,m_pos));
219 /* set new length of previous literal run */
220 lit += 3 + t + 3;
221 *litp = (unsigned char)(lit - 3);
222 o_m2++;
223 *op++ = *m_pos++;
224 *op++ = *m_pos++;
225 *op++ = *m_pos++;
226 goto copy_literal_run;
227 }
228 } else {
229 if (t >= 32) { /* a M3 match */
230 t &= 31;
231 if (t == 0) {
232 t = 31;
233 while (*ip == 0)
234 t += 255, ip++;
235 t += *ip++;
236 }
237 m_pos = op - 1;
238 m_pos -= *ip++ >> 2;
239 m_pos -= *ip++ << 6;
240 } else { /* a M4 match */
241 m_pos = op;
242 m_pos -= (t & 8) << 11;
243 t &= 7;
244 if (t == 0) {
245 t = 7;
246 while (*ip == 0)
247 t += 255, ip++;
248 t += *ip++;
249 }
250 m_pos -= *ip++ >> 2;
251 m_pos -= *ip++ << 6;
252 if (m_pos == op)
253 goto eof_found;
254 m_pos -= 0x4000;
255 }
256 if (litp == NULL)
257 goto copy_m;
258
259 nl = ip[-2] & 3;
260 /* test if in beetween two matches */
261 if (t == 1 && lit == 0 && nl == 0 && ip[0] >= 16) {
262 next_lit = nl;
263 /* make a previous short run */
264 lit += 3;
265 *litp = (unsigned char)((*litp & ~3) | lit);
266 /* copy over the 3 literals that replace the match */
267 copy3(ip-3,m_pos,pd(op,m_pos));
268 o_m3_a++;
269 }
270 /* test if a literal run follows */
271 else if (t == 1 && lit <= 3 && nl == 0
272 && ip[0] < 16 && ip[0] != 0 && (lit + 3 + ip[0] < 16)
273 ) {
274 t = *ip++;
275 /* remove short run */
276 *litp &= ~3;
277 /* copy over the 3 literals that replace the match */
278 copy3(ip-4+1,m_pos,pd(op,m_pos));
279 /* move literals 1 byte ahead */
280 litp += 2;
281 if (lit > 0)
282 memmove(litp+1,litp,lit);
283 /* insert new length of long literal run */
284 lit += 3 + t + 3;
285 *litp = (unsigned char)(lit - 3);
286
287 o_m3_b++;
288 *op++ = *m_pos++;
289 *op++ = *m_pos++;
290 *op++ = *m_pos++;
291 goto copy_literal_run;
292 }
293 }
294 copy_m:
295 *op++ = *m_pos++;
296 *op++ = *m_pos++;
297 do *op++ = *m_pos++; while (--t > 0);
298 }
299
300 match_done:
301 if (next_lit == NO_LIT) {
302 t = ip[-2] & 3;
303 lit = t;
304 litp = ip - 2;
305 }
306 else
307 t = next_lit;
308 next_lit = NO_LIT;
309 if (t == 0)
310 break;
311 /* copy literals */
312 match_next:
313 do *op++ = *ip++; while (--t > 0);
314 t = *ip++;
315 } while (TEST_IP && TEST_OP);
316 }
317
318 /* no EOF code was found */
319 *out_len = pd(op, out);
320 return LZO_E_EOF_NOT_FOUND;
321
322 eof_found:
323// LZO_UNUSED(o_m1_a); LZO_UNUSED(o_m1_b); LZO_UNUSED(o_m2);
324// LZO_UNUSED(o_m3_a); LZO_UNUSED(o_m3_b);
325 *out_len = pd(op, out);
326 return (ip == ip_end ? LZO_E_OK :
327 (ip < ip_end ? LZO_E_INPUT_NOT_CONSUMED : LZO_E_INPUT_OVERRUN));
328}
329
330/**********************************************************************/
331#define F_OS F_OS_UNIX
332#define F_CS F_CS_NATIVE
333
334/**********************************************************************/
335#define ADLER32_INIT_VALUE 1
336#define CRC32_INIT_VALUE 0
337
338/**********************************************************************/
339enum {
340 M_LZO1X_1 = 1,
341 M_LZO1X_1_15 = 2,
342 M_LZO1X_999 = 3,
343};
344
345/**********************************************************************/
346/* header flags */
347#define F_ADLER32_D 0x00000001L
348#define F_ADLER32_C 0x00000002L
349#define F_H_EXTRA_FIELD 0x00000040L
350#define F_H_GMTDIFF 0x00000080L
351#define F_CRC32_D 0x00000100L
352#define F_CRC32_C 0x00000200L
353#define F_H_FILTER 0x00000800L
354#define F_H_CRC32 0x00001000L
355#define F_MASK 0x00003FFFL
356
357/* operating system & file system that created the file [mostly unused] */
358#define F_OS_UNIX 0x03000000L
359#define F_OS_SHIFT 24
360#define F_OS_MASK 0xff000000L
361
362/* character set for file name encoding [mostly unused] */
363#define F_CS_NATIVE 0x00000000L
364#define F_CS_SHIFT 20
365#define F_CS_MASK 0x00f00000L
366
367/* these bits must be zero */
368#define F_RESERVED ((F_MASK | F_OS_MASK | F_CS_MASK) ^ 0xffffffffL)
369
370typedef struct chksum_t {
371 uint32_t f_adler32;
372 uint32_t f_crc32;
373} chksum_t;
374
375typedef struct header_t {
376 unsigned version;
377 unsigned lib_version;
378 unsigned version_needed_to_extract;
379 uint32_t flags;
380 uint32_t mode;
381 uint32_t mtime;
382 uint32_t gmtdiff;
383 uint32_t header_checksum;
384
385 uint32_t extra_field_len;
386 uint32_t extra_field_checksum;
387
388 unsigned char method;
389 unsigned char level;
390
391 /* info */
392 char name[255+1];
393} header_t;
394
395struct globals {
396 /*const uint32_t *lzo_crc32_table;*/
397 chksum_t chksum_in;
398 chksum_t chksum_out;
399} FIX_ALIASING;
400#define G (*(struct globals*)&bb_common_bufsiz1)
401#define INIT_G() do { } while (0)
402//#define G (*ptr_to_globals)
403//#define INIT_G() do {
404// SET_PTR_TO_GLOBALS(xzalloc(sizeof(G)));
405//} while (0)
406
407
408/**********************************************************************/
409#define LZOP_VERSION 0x1010
410//#define LZOP_VERSION_STRING "1.01"
411//#define LZOP_VERSION_DATE "Apr 27th 2003"
412
413#define OPTION_STRING "cfvdt123456789CF"
414
415enum {
416 OPT_STDOUT = (1 << 0),
417 OPT_FORCE = (1 << 1),
418 OPT_VERBOSE = (1 << 2),
419 OPT_DECOMPRESS = (1 << 3),
420 OPT_TEST = (1 << 4),
421 OPT_1 = (1 << 5),
422 OPT_2 = (1 << 6),
423 OPT_3 = (1 << 7),
424 OPT_4 = (1 << 8),
425 OPT_5 = (1 << 9),
426 OPT_6 = (1 << 10),
427 OPT_789 = (7 << 11),
428 OPT_7 = (1 << 11),
429 OPT_8 = (1 << 12),
430 OPT_C = (1 << 14),
431 OPT_F = (1 << 15),
432};
433
434/**********************************************************************/
435// adler32 checksum
436// adapted from free code by Mark Adler <madler@alumni.caltech.edu>
437// see http://www.zlib.org/
438/**********************************************************************/
439static FAST_FUNC uint32_t
440lzo_adler32(uint32_t adler, const uint8_t* buf, unsigned len)
441{
442 enum {
443 LZO_BASE = 65521, /* largest prime smaller than 65536 */
444 /* NMAX is the largest n such that
445 * 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
446 LZO_NMAX = 5552,
447 };
448 uint32_t s1 = adler & 0xffff;
449 uint32_t s2 = (adler >> 16) & 0xffff;
450 unsigned k;
451
452 if (buf == NULL)
453 return 1;
454
455 while (len > 0) {
456 k = len < LZO_NMAX ? (unsigned) len : LZO_NMAX;
457 len -= k;
458 if (k != 0) do {
459 s1 += *buf++;
460 s2 += s1;
461 } while (--k > 0);
462 s1 %= LZO_BASE;
463 s2 %= LZO_BASE;
464 }
465 return (s2 << 16) | s1;
466}
467
468static FAST_FUNC uint32_t
469lzo_crc32(uint32_t c, const uint8_t* buf, unsigned len)
470{
471 //if (buf == NULL) - impossible
472 // return 0;
473
474 return ~crc32_block_endian0(~c, buf, len, global_crc32_table);
475}
476
477/**********************************************************************/
478static void init_chksum(chksum_t *ct)
479{
480 ct->f_adler32 = ADLER32_INIT_VALUE;
481 ct->f_crc32 = CRC32_INIT_VALUE;
482}
483
484static void add_bytes_to_chksum(chksum_t *ct, const void* buf, int cnt)
485{
486 /* We need to handle the two checksums at once, because at the
487 * beginning of the header, we don't know yet which one we'll
488 * eventually need */
489 ct->f_adler32 = lzo_adler32(ct->f_adler32, (const uint8_t*)buf, cnt);
490 ct->f_crc32 = lzo_crc32(ct->f_crc32, (const uint8_t*)buf, cnt);
491}
492
493static uint32_t chksum_getresult(chksum_t *ct, const header_t *h)
494{
495 return (h->flags & F_H_CRC32) ? ct->f_crc32 : ct->f_adler32;
496}
497
498/**********************************************************************/
499static uint32_t read32(void)
500{
501 uint32_t v;
502 xread(0, &v, 4);
503 return ntohl(v);
504}
505
506static void write32(uint32_t v)
507{
508 v = htonl(v);
509 xwrite(1, &v, 4);
510}
511
512static void f_write(const void* buf, int cnt)
513{
514 xwrite(1, buf, cnt);
515 add_bytes_to_chksum(&G.chksum_out, buf, cnt);
516}
517
518static void f_read(void* buf, int cnt)
519{
520 xread(0, buf, cnt);
521 add_bytes_to_chksum(&G.chksum_in, buf, cnt);
522}
523
524static int f_read8(void)
525{
526 uint8_t v;
527 f_read(&v, 1);
528 return v;
529}
530
531static void f_write8(uint8_t v)
532{
533 f_write(&v, 1);
534}
535
536static unsigned f_read16(void)
537{
538 uint16_t v;
539 f_read(&v, 2);
540 return ntohs(v);
541}
542
543static void f_write16(uint16_t v)
544{
545 v = htons(v);
546 f_write(&v, 2);
547}
548
549static uint32_t f_read32(void)
550{
551 uint32_t v;
552 f_read(&v, 4);
553 return ntohl(v);
554}
555
556static void f_write32(uint32_t v)
557{
558 v = htonl(v);
559 f_write(&v, 4);
560}
561
562/**********************************************************************/
563static int lzo_get_method(header_t *h)
564{
565 /* check method */
566 if (h->method == M_LZO1X_1) {
567 if (h->level == 0)
568 h->level = 3;
569 } else if (h->method == M_LZO1X_1_15) {
570 if (h->level == 0)
571 h->level = 1;
572 } else if (h->method == M_LZO1X_999) {
573 if (h->level == 0)
574 h->level = 9;
575 } else
576 return -1; /* not a LZO method */
577
578 /* check compression level */
579 if (h->level < 1 || h->level > 9)
580 return 15;
581
582 return 0;
583}
584
585/**********************************************************************/
586#define LZO_BLOCK_SIZE (256 * 1024l)
587#define MAX_BLOCK_SIZE (64 * 1024l * 1024l) /* DO NOT CHANGE */
588
589/* LZO may expand uncompressible data by a small amount */
590#define MAX_COMPRESSED_SIZE(x) ((x) + (x) / 16 + 64 + 3)
591
592/**********************************************************************/
593// compress a file
594/**********************************************************************/
595static NOINLINE smallint lzo_compress(const header_t *h)
596{
597 unsigned block_size = LZO_BLOCK_SIZE;
598 int r = 0; /* LZO_E_OK */
599 uint8_t *const b1 = xzalloc(block_size);
600 uint8_t *const b2 = xzalloc(MAX_COMPRESSED_SIZE(block_size));
601 unsigned src_len = 0, dst_len = 0;
602 uint32_t d_adler32 = ADLER32_INIT_VALUE;
603 uint32_t d_crc32 = CRC32_INIT_VALUE;
604 int l;
605 smallint ok = 1;
606 uint8_t *wrk_mem = NULL;
607
608 if (h->method == M_LZO1X_1)
609 wrk_mem = xzalloc(LZO1X_1_MEM_COMPRESS);
610 else if (h->method == M_LZO1X_1_15)
611 wrk_mem = xzalloc(LZO1X_1_15_MEM_COMPRESS);
612 else if (h->method == M_LZO1X_999)
613 wrk_mem = xzalloc(LZO1X_999_MEM_COMPRESS);
614
615 for (;;) {
616 /* read a block */
617 l = full_read(0, b1, block_size);
618 src_len = (l > 0 ? l : 0);
619
620 /* write uncompressed block size */
621 write32(src_len);
622
623 /* exit if last block */
624 if (src_len == 0)
625 break;
626
627 /* compute checksum of uncompressed block */
628 if (h->flags & F_ADLER32_D)
629 d_adler32 = lzo_adler32(ADLER32_INIT_VALUE, b1, src_len);
630 if (h->flags & F_CRC32_D)
631 d_crc32 = lzo_crc32(CRC32_INIT_VALUE, b1, src_len);
632
633 /* compress */
634 if (h->method == M_LZO1X_1)
635 r = lzo1x_1_compress(b1, src_len, b2, &dst_len, wrk_mem);
636 else if (h->method == M_LZO1X_1_15)
637 r = lzo1x_1_15_compress(b1, src_len, b2, &dst_len, wrk_mem);
638#if ENABLE_LZOP_COMPR_HIGH
639 else if (h->method == M_LZO1X_999)
640 r = lzo1x_999_compress_level(b1, src_len, b2, &dst_len,
641 wrk_mem, h->level);
642#endif
643 else
644 bb_error_msg_and_die("internal error");
645
646 if (r != 0) /* not LZO_E_OK */
647 bb_error_msg_and_die("internal error - compression failed");
648
649 /* write compressed block size */
650 if (dst_len < src_len) {
651 /* optimize */
652 if (h->method == M_LZO1X_999) {
653 unsigned new_len = src_len;
654 r = lzo1x_optimize(b2, dst_len, b1, &new_len, NULL);
655 if (r != 0 /*LZO_E_OK*/ || new_len != src_len)
656 bb_error_msg_and_die("internal error - optimization failed");
657 }
658 write32(dst_len);
659 } else {
660 /* data actually expanded => store data uncompressed */
661 write32(src_len);
662 }
663
664 /* write checksum of uncompressed block */
665 if (h->flags & F_ADLER32_D)
666 write32(d_adler32);
667 if (h->flags & F_CRC32_D)
668 write32(d_crc32);
669
670 if (dst_len < src_len) {
671 /* write checksum of compressed block */
672 if (h->flags & F_ADLER32_C)
673 write32(lzo_adler32(ADLER32_INIT_VALUE, b2, dst_len));
674 if (h->flags & F_CRC32_C)
675 write32(lzo_crc32(CRC32_INIT_VALUE, b2, dst_len));
676 /* write compressed block data */
677 xwrite(1, b2, dst_len);
678 } else {
679 /* write uncompressed block data */
680 xwrite(1, b1, src_len);
681 }
682 }
683
684 free(wrk_mem);
685 free(b1);
686 free(b2);
687 return ok;
688}
689
690static FAST_FUNC void lzo_check(
691 uint32_t init,
692 uint8_t* buf, unsigned len,
693 uint32_t FAST_FUNC (*fn)(uint32_t, const uint8_t*, unsigned),
694 uint32_t ref)
695{
696 /* This function, by having the same order of parameters
697 * as fn, and by being marked FAST_FUNC (same as fn),
698 * saves a dozen bytes of code.
699 */
700 uint32_t c = fn(init, buf, len);
701 if (c != ref)
702 bb_error_msg_and_die("checksum error");
703}
704
705/**********************************************************************/
706// decompress a file
707/**********************************************************************/
708static NOINLINE smallint lzo_decompress(const header_t *h)
709{
710 unsigned block_size = LZO_BLOCK_SIZE;
711 int r;
712 uint32_t src_len, dst_len;
713 uint32_t c_adler32 = ADLER32_INIT_VALUE;
714 uint32_t d_adler32 = ADLER32_INIT_VALUE;
715 uint32_t c_crc32 = CRC32_INIT_VALUE, d_crc32 = CRC32_INIT_VALUE;
716 smallint ok = 1;
717 uint8_t *b1;
718 uint32_t mcs_block_size = MAX_COMPRESSED_SIZE(block_size);
719 uint8_t *b2 = NULL;
720
721 for (;;) {
722 uint8_t *dst;
723
724 /* read uncompressed block size */
725 dst_len = read32();
726
727 /* exit if last block */
728 if (dst_len == 0)
729 break;
730
731 /* error if split file */
732 if (dst_len == 0xffffffffL)
733 /* should not happen - not yet implemented */
734 bb_error_msg_and_die("this file is a split lzop file");
735
736 if (dst_len > MAX_BLOCK_SIZE)
737 bb_error_msg_and_die("corrupted data");
738
739 /* read compressed block size */
740 src_len = read32();
741 if (src_len <= 0 || src_len > dst_len)
742 bb_error_msg_and_die("corrupted data");
743
744 if (dst_len > block_size) {
745 if (b2) {
746 free(b2);
747 b2 = NULL;
748 }
749 block_size = dst_len;
750 mcs_block_size = MAX_COMPRESSED_SIZE(block_size);
751 }
752
753 /* read checksum of uncompressed block */
754 if (h->flags & F_ADLER32_D)
755 d_adler32 = read32();
756 if (h->flags & F_CRC32_D)
757 d_crc32 = read32();
758
759 /* read checksum of compressed block */
760 if (src_len < dst_len) {
761 if (h->flags & F_ADLER32_C)
762 c_adler32 = read32();
763 if (h->flags & F_CRC32_C)
764 c_crc32 = read32();
765 }
766
767 if (b2 == NULL)
768 b2 = xzalloc(mcs_block_size);
769 /* read the block into the end of our buffer */
770 b1 = b2 + mcs_block_size - src_len;
771 xread(0, b1, src_len);
772
773 if (src_len < dst_len) {
774 unsigned d = dst_len;
775
776 if (!(option_mask32 & OPT_F)) {
777 /* verify checksum of compressed block */
778 if (h->flags & F_ADLER32_C)
779 lzo_check(ADLER32_INIT_VALUE,
780 b1, src_len,
781 lzo_adler32, c_adler32);
782 if (h->flags & F_CRC32_C)
783 lzo_check(CRC32_INIT_VALUE,
784 b1, src_len,
785 lzo_crc32, c_crc32);
786 }
787
788 /* decompress */
789// if (option_mask32 & OPT_F)
790// r = lzo1x_decompress(b1, src_len, b2, &d, NULL);
791// else
792 r = lzo1x_decompress_safe(b1, src_len, b2, &d, NULL);
793
794 if (r != 0 /*LZO_E_OK*/ || dst_len != d) {
795 bb_error_msg_and_die("corrupted data");
796 }
797 dst = b2;
798 } else {
799 /* "stored" block => no decompression */
800 dst = b1;
801 }
802
803 if (!(option_mask32 & OPT_F)) {
804 /* verify checksum of uncompressed block */
805 if (h->flags & F_ADLER32_D)
806 lzo_check(ADLER32_INIT_VALUE,
807 dst, dst_len,
808 lzo_adler32, d_adler32);
809 if (h->flags & F_CRC32_D)
810 lzo_check(CRC32_INIT_VALUE,
811 dst, dst_len,
812 lzo_crc32, d_crc32);
813 }
814
815 /* write uncompressed block data */
816 xwrite(1, dst, dst_len);
817 }
818
819 free(b2);
820 return ok;
821}
822
823/**********************************************************************/
824// lzop file signature (shamelessly borrowed from PNG)
825/**********************************************************************/
826/*
827 * The first nine bytes of a lzop file always contain the following values:
828 *
829 * 0 1 2 3 4 5 6 7 8
830 * --- --- --- --- --- --- --- --- ---
831 * (hex) 89 4c 5a 4f 00 0d 0a 1a 0a
832 * (decimal) 137 76 90 79 0 13 10 26 10
833 * (C notation - ASCII) \211 L Z O \0 \r \n \032 \n
834 */
835
836/* (vda) comparison with lzop v1.02rc1 ("lzop -1 <FILE" cmd):
837 * Only slight differences in header:
838 * -00000000 89 4c 5a 4f 00 0d 0a 1a 0a 10 20 20 20 09 40 02
839 * +00000000 89 4c 5a 4f 00 0d 0a 1a 0a 10 10 20 30 09 40 02
840 * ^^^^^ ^^^^^
841 * version lib_version
842 * -00000010 01 03 00 00 0d 00 00 81 a4 49 f7 a6 3f 00 00 00
843 * +00000010 01 03 00 00 01 00 00 00 00 00 00 00 00 00 00 00
844 * ^^^^^^^^^^^ ^^^^^^^^^^^ ^^^^^^^^^^^
845 * flags mode mtime
846 * -00000020 00 00 2d 67 04 17 00 04 00 00 00 03 ed ec 9d 6d
847 * +00000020 00 00 10 5f 00 c1 00 04 00 00 00 03 ed ec 9d 6d
848 * ^^^^^^^^^^^
849 * chksum_out
850 * The rest is identical.
851*/
852static const unsigned char lzop_magic[9] = {
853 0x89, 0x4c, 0x5a, 0x4f, 0x00, 0x0d, 0x0a, 0x1a, 0x0a
854};
855
856/* This coding is derived from Alexander Lehmann's pngcheck code. */
857static void check_magic(void)
858{
859 unsigned char magic[sizeof(lzop_magic)];
860 xread(0, magic, sizeof(magic));
861 if (memcmp(magic, lzop_magic, sizeof(lzop_magic)) != 0)
862 bb_error_msg_and_die("bad magic number");
863}
864
865/**********************************************************************/
866// lzop file header
867/**********************************************************************/
868static void write_header(const header_t *h)
869{
870 int l;
871
872 xwrite(1, lzop_magic, sizeof(lzop_magic));
873
874 init_chksum(&G.chksum_out);
875
876 f_write16(h->version);
877 f_write16(h->lib_version);
878 f_write16(h->version_needed_to_extract);
879 f_write8(h->method);
880 f_write8(h->level);
881 f_write32(h->flags);
882 f_write32(h->mode);
883 f_write32(h->mtime);
884 f_write32(h->gmtdiff);
885
886 l = (int) strlen(h->name);
887 f_write8(l);
888 if (l)
889 f_write(h->name, l);
890
891 f_write32(chksum_getresult(&G.chksum_out, h));
892}
893
894static int read_header(header_t *h)
895{
896 int r;
897 int l;
898 uint32_t checksum;
899
900 memset(h, 0, sizeof(*h));
901 h->version_needed_to_extract = 0x0900; /* first lzop version */
902 h->level = 0;
903
904 init_chksum(&G.chksum_in);
905
906 h->version = f_read16();
907 if (h->version < 0x0900)
908 return 3;
909 h->lib_version = f_read16();
910 if (h->version >= 0x0940) {
911 h->version_needed_to_extract = f_read16();
912 if (h->version_needed_to_extract > LZOP_VERSION)
913 return 16;
914 if (h->version_needed_to_extract < 0x0900)
915 return 3;
916 }
917 h->method = f_read8();
918 if (h->version >= 0x0940)
919 h->level = f_read8();
920 h->flags = f_read32();
921 if (h->flags & F_H_FILTER)
922 return 16; /* filter not supported */
923 h->mode = f_read32();
924 h->mtime = f_read32();
925 if (h->version >= 0x0940)
926 h->gmtdiff = f_read32();
927
928 l = f_read8();
929 if (l > 0)
930 f_read(h->name, l);
931 h->name[l] = 0;
932
933 checksum = chksum_getresult(&G.chksum_in, h);
934 h->header_checksum = f_read32();
935 if (h->header_checksum != checksum)
936 return 2;
937
938 if (h->method <= 0)
939 return 14;
940 r = lzo_get_method(h);
941 if (r != 0)
942 return r;
943
944 /* check reserved flags */
945 if (h->flags & F_RESERVED)
946 return -13;
947
948 /* skip extra field [not used yet] */
949 if (h->flags & F_H_EXTRA_FIELD) {
950 uint32_t k;
951
952 /* note: the checksum also covers the length */
953 init_chksum(&G.chksum_in);
954 h->extra_field_len = f_read32();
955 for (k = 0; k < h->extra_field_len; k++)
956 f_read8();
957 checksum = chksum_getresult(&G.chksum_in, h);
958 h->extra_field_checksum = f_read32();
959 if (h->extra_field_checksum != checksum)
960 return 3;
961 }
962
963 return 0;
964}
965
966static void p_header(header_t *h)
967{
968 int r;
969
970 r = read_header(h);
971 if (r == 0)
972 return;
973 bb_error_msg_and_die("header_error %d", r);
974}
975
976/**********************************************************************/
977// compress
978/**********************************************************************/
979static void lzo_set_method(header_t *h)
980{
981 int level = 1;
982
983 if (option_mask32 & OPT_1) {
984 h->method = M_LZO1X_1_15;
985 } else if (option_mask32 & OPT_789) {
986#if ENABLE_LZOP_COMPR_HIGH
987 h->method = M_LZO1X_999;
988 if (option_mask32 & OPT_7)
989 level = 7;
990 else if (option_mask32 & OPT_8)
991 level = 8;
992 else
993 level = 9;
994#else
995 bb_error_msg_and_die("high compression not compiled in");
996#endif
997 } else { /* levels 2..6 or none (defaults to level 3) */
998 h->method = M_LZO1X_1;
999 level = 5; /* levels 2-6 are actually the same */
1000 }
1001
1002 h->level = level;
1003}
1004
1005static smallint do_lzo_compress(void)
1006{
1007 header_t header;
1008
1009#define h (&header)
1010 memset(h, 0, sizeof(*h));
1011
1012 lzo_set_method(h);
1013
1014 h->version = (LZOP_VERSION & 0xffff);
1015 h->version_needed_to_extract = 0x0940;
1016 h->lib_version = lzo_version() & 0xffff;
1017
1018 h->flags = (F_OS & F_OS_MASK) | (F_CS & F_CS_MASK);
1019
1020 if (!(option_mask32 & OPT_F) || h->method == M_LZO1X_999) {
1021 h->flags |= F_ADLER32_D;
1022 if (option_mask32 & OPT_C)
1023 h->flags |= F_ADLER32_C;
1024 }
1025 write_header(h);
1026 return lzo_compress(h);
1027#undef h
1028}
1029
1030/**********************************************************************/
1031// decompress
1032/**********************************************************************/
1033static smallint do_lzo_decompress(void)
1034{
1035 header_t header;
1036
1037 check_magic();
1038 p_header(&header);
1039 return lzo_decompress(&header);
1040}
1041
1042static char* FAST_FUNC make_new_name_lzop(char *filename, const char *expected_ext UNUSED_PARAM)
1043{
1044 if (option_mask32 & OPT_DECOMPRESS) {
1045 char *extension = strrchr(filename, '.');
1046 if (!extension || strcmp(extension + 1, "lzo") != 0)
1047 return xasprintf("%s.out", filename);
1048 *extension = '\0';
1049 return filename;
1050 }
1051 return xasprintf("%s.lzo", filename);
1052}
1053
1054static IF_DESKTOP(long long) int FAST_FUNC pack_lzop(unpack_info_t *info UNUSED_PARAM)
1055{
1056 if (option_mask32 & OPT_DECOMPRESS)
1057 return do_lzo_decompress();
1058 return do_lzo_compress();
1059}
1060
1061int lzop_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1062int lzop_main(int argc UNUSED_PARAM, char **argv)
1063{
1064 getopt32(argv, OPTION_STRING);
1065 argv += optind;
1066 /* lzopcat? */
1067 if (applet_name[4] == 'c')
1068 option_mask32 |= (OPT_STDOUT | OPT_DECOMPRESS);
1069 /* unlzop? */
1070 if (applet_name[0] == 'u')
1071 option_mask32 |= OPT_DECOMPRESS;
1072
1073 global_crc32_table = crc32_filltable(NULL, 0);
1074 return bbunpack(argv, pack_lzop, make_new_name_lzop, /*unused:*/ NULL);
1075}
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