2 This file is part of the lzop file compressor.
4 Copyright (C) 1996..2003 Markus Franz Xaver Johannes Oberhumer
7 Markus F.X.J. Oberhumer <markus@oberhumer.com>
8 http://www.oberhumer.com/opensource/lzop/
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.
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.
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.
25 "Minimalized" for busybox by Alain Knaff
29 #include "unarchive.h"
30 #include "liblzo_interface.h"
32 /* lzo-2.03/src/lzo_ptr.h */
33 #define pd(a,b) ((unsigned)((a)-(b)))
35 #define lzo_version() LZO_VERSION
36 #define lzo_sizeof_dict_t (sizeof(uint8_t*))
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))
43 /* lzo-2.03/src/lzo1x_oo.c */
44 #define NO_LIT UINT_MAX
46 /**********************************************************************/
47 static void copy2(uint8_t* ip, const uint8_t* m_pos, unsigned off)
56 static void copy3(uint8_t* ip, const uint8_t* m_pos, unsigned off)
60 ip[2] = ip[1] = m_pos[0];
72 /**********************************************************************/
73 // optimize a block of data.
74 /**********************************************************************/
75 #define TEST_IP (ip < ip_end)
76 #define TEST_OP (op <= op_end)
78 static NOINLINE int lzo1x_optimize(uint8_t *in, unsigned in_len,
79 uint8_t *out, unsigned *out_len,
80 void* wrkmem UNUSED_PARAM)
86 uint8_t* const ip_end = in + in_len;
87 uint8_t* const op_end = out + *out_len;
90 unsigned next_lit = NO_LIT;
92 unsigned long o_m1_a = 0, o_m1_b = 0, o_m2 = 0, o_m3_a = 0, o_m3_b = 0;
94 // LZO_UNUSED(wrkmem);
105 goto first_literal_run;
108 while (TEST_IP && TEST_OP) {
127 do *op++ = *ip++; while (--t > 0);
134 m_pos = op - 1 - 0x800;
136 m_pos = op - 1 - 0x400;
149 if (t < 16) { /* a M1 match */
158 /* test if a match follows */
159 if (nl == 0 && lit == 1 && ip[0] >= 16) {
161 /* adjust length of previous short run */
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));
168 /* test if a literal run follows */
173 && (lit + 2 + ip[0] < 16)
176 /* remove short run */
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 */
183 memmove(litp+1, litp, lit);
184 /* insert new length of long literal run */
186 *litp = (unsigned char)(lit - 3);
189 *op++ = *m_pos++; *op++ = *m_pos++;
190 goto copy_literal_run;
197 if (t >= 64) { /* a M2 match */
200 m_pos -= (t >> 2) & 7;
204 m_pos -= (t >> 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)
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 */
221 *litp = (unsigned char)(lit - 3);
226 goto copy_literal_run;
229 if (t >= 32) { /* a M3 match */
240 } else { /* a M4 match */
242 m_pos -= (t & 8) << 11;
260 /* test if in beetween two matches */
261 if (t == 1 && lit == 0 && nl == 0 && ip[0] >= 16) {
263 /* make a previous short run */
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));
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)
275 /* remove short run */
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 */
282 memmove(litp+1,litp,lit);
283 /* insert new length of long literal run */
285 *litp = (unsigned char)(lit - 3);
291 goto copy_literal_run;
297 do *op++ = *m_pos++; while (--t > 0);
301 if (next_lit == NO_LIT) {
313 do *op++ = *ip++; while (--t > 0);
315 } while (TEST_IP && TEST_OP);
318 /* no EOF code was found */
319 *out_len = pd(op, out);
320 return LZO_E_EOF_NOT_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));
330 /**********************************************************************/
331 #define F_OS F_OS_UNIX
332 #define F_CS F_CS_NATIVE
334 /**********************************************************************/
335 #define ADLER32_INIT_VALUE 1
336 #define CRC32_INIT_VALUE 0
338 /**********************************************************************/
345 /**********************************************************************/
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
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
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
367 /* these bits must be zero */
368 #define F_RESERVED ((F_MASK | F_OS_MASK | F_CS_MASK) ^ 0xffffffffL)
370 typedef struct chksum_t {
375 typedef struct header_t {
377 unsigned lib_version;
378 unsigned version_needed_to_extract;
383 uint32_t header_checksum;
385 uint32_t extra_field_len;
386 uint32_t extra_field_checksum;
388 unsigned char method;
396 const uint32_t *lzo_crc32_table;
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)));
408 /**********************************************************************/
409 #define LZOP_VERSION 0x1010
410 //#define LZOP_VERSION_STRING "1.01"
411 //#define LZOP_VERSION_DATE "Apr 27th 2003"
413 #define OPTION_STRING "cfvdt123456789CF"
416 OPT_STDOUT = (1 << 0),
417 OPT_FORCE = (1 << 1),
418 OPT_VERBOSE = (1 << 2),
419 OPT_DECOMPRESS = (1 << 3),
434 /**********************************************************************/
436 // adapted from free code by Mark Adler <madler@alumni.caltech.edu>
437 // see http://www.zlib.org/
438 /**********************************************************************/
439 static FAST_FUNC uint32_t
440 lzo_adler32(uint32_t adler, const uint8_t* buf, unsigned len)
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 */
448 uint32_t s1 = adler & 0xffff;
449 uint32_t s2 = (adler >> 16) & 0xffff;
456 k = len < LZO_NMAX ? (unsigned) len : LZO_NMAX;
465 return (s2 << 16) | s1;
468 static FAST_FUNC uint32_t
469 lzo_crc32(uint32_t c, const uint8_t* buf, unsigned len)
478 crc = G.lzo_crc32_table[(uint8_t)((int)crc ^ *buf)] ^ (crc >> 8);
486 /**********************************************************************/
487 static void init_chksum(chksum_t *ct)
489 ct->f_adler32 = ADLER32_INIT_VALUE;
490 ct->f_crc32 = CRC32_INIT_VALUE;
493 static void add_bytes_to_chksum(chksum_t *ct, const void* buf, int cnt)
495 /* We need to handle the two checksums at once, because at the
496 * beginning of the header, we don't know yet which one we'll
498 ct->f_adler32 = lzo_adler32(ct->f_adler32, (const uint8_t*)buf, cnt);
499 ct->f_crc32 = lzo_crc32(ct->f_crc32, (const uint8_t*)buf, cnt);
502 static uint32_t chksum_getresult(chksum_t *ct, const header_t *h)
504 return (h->flags & F_H_CRC32) ? ct->f_crc32 : ct->f_adler32;
507 /**********************************************************************/
508 static uint32_t read32(void)
515 static void write32(uint32_t v)
521 static void f_write(const void* buf, int cnt)
524 add_bytes_to_chksum(&G.chksum_out, buf, cnt);
527 static void f_read(void* buf, int cnt)
530 add_bytes_to_chksum(&G.chksum_in, buf, cnt);
533 static int f_read8(void)
540 static void f_write8(uint8_t v)
545 static unsigned f_read16(void)
552 static void f_write16(uint16_t v)
558 static uint32_t f_read32(void)
565 static void f_write32(uint32_t v)
571 /**********************************************************************/
572 static int lzo_get_method(header_t *h)
575 if (h->method == M_LZO1X_1) {
578 } else if (h->method == M_LZO1X_1_15) {
581 } else if (h->method == M_LZO1X_999) {
585 return -1; /* not a LZO method */
587 /* check compression level */
588 if (h->level < 1 || h->level > 9)
594 /**********************************************************************/
595 #define LZO_BLOCK_SIZE (256 * 1024l)
596 #define MAX_BLOCK_SIZE (64 * 1024l * 1024l) /* DO NOT CHANGE */
598 /* LZO may expand uncompressible data by a small amount */
599 #define MAX_COMPRESSED_SIZE(x) ((x) + (x) / 16 + 64 + 3)
601 /**********************************************************************/
603 /**********************************************************************/
604 static NOINLINE smallint lzo_compress(const header_t *h)
606 unsigned block_size = LZO_BLOCK_SIZE;
607 int r = 0; /* LZO_E_OK */
608 uint8_t *const b1 = xzalloc(block_size);
609 uint8_t *const b2 = xzalloc(MAX_COMPRESSED_SIZE(block_size));
610 unsigned src_len = 0, dst_len = 0;
611 uint32_t d_adler32 = ADLER32_INIT_VALUE;
612 uint32_t d_crc32 = CRC32_INIT_VALUE;
615 uint8_t *wrk_mem = NULL;
617 if (h->method == M_LZO1X_1)
618 wrk_mem = xzalloc(LZO1X_1_MEM_COMPRESS);
619 else if (h->method == M_LZO1X_1_15)
620 wrk_mem = xzalloc(LZO1X_1_15_MEM_COMPRESS);
621 else if (h->method == M_LZO1X_999)
622 wrk_mem = xzalloc(LZO1X_999_MEM_COMPRESS);
626 l = full_read(0, b1, block_size);
627 src_len = (l > 0 ? l : 0);
629 /* write uncompressed block size */
632 /* exit if last block */
636 /* compute checksum of uncompressed block */
637 if (h->flags & F_ADLER32_D)
638 d_adler32 = lzo_adler32(ADLER32_INIT_VALUE, b1, src_len);
639 if (h->flags & F_CRC32_D)
640 d_crc32 = lzo_crc32(CRC32_INIT_VALUE, b1, src_len);
643 if (h->method == M_LZO1X_1)
644 r = lzo1x_1_compress(b1, src_len, b2, &dst_len, wrk_mem);
645 else if (h->method == M_LZO1X_1_15)
646 r = lzo1x_1_15_compress(b1, src_len, b2, &dst_len, wrk_mem);
647 #if ENABLE_LZOP_COMPR_HIGH
648 else if (h->method == M_LZO1X_999)
649 r = lzo1x_999_compress_level(b1, src_len, b2, &dst_len,
653 bb_error_msg_and_die("internal error");
655 if (r != 0) /* not LZO_E_OK */
656 bb_error_msg_and_die("internal error - compression failed");
658 /* write compressed block size */
659 if (dst_len < src_len) {
661 if (h->method == M_LZO1X_999) {
662 unsigned new_len = src_len;
663 r = lzo1x_optimize(b2, dst_len, b1, &new_len, NULL);
664 if (r != 0 /*LZO_E_OK*/ || new_len != src_len)
665 bb_error_msg_and_die("internal error - optimization failed");
669 /* data actually expanded => store data uncompressed */
673 /* write checksum of uncompressed block */
674 if (h->flags & F_ADLER32_D)
676 if (h->flags & F_CRC32_D)
679 if (dst_len < src_len) {
680 /* write checksum of compressed block */
681 if (h->flags & F_ADLER32_C)
682 write32(lzo_adler32(ADLER32_INIT_VALUE, b2,
684 if (h->flags & F_CRC32_C)
685 write32(lzo_crc32(CRC32_INIT_VALUE, b2, dst_len));
686 /* write compressed block data */
687 xwrite(1, b2, dst_len);
689 /* write uncompressed block data */
690 xwrite(1, b1, src_len);
700 static void lzo_check(uint32_t FAST_FUNC (*fn)(uint32_t, const uint8_t*, unsigned),
701 uint32_t ref, uint32_t init,
702 uint8_t* buf, unsigned len)
704 uint32_t c = fn(init, buf, len);
706 bb_error_msg_and_die("checksum error");
709 /**********************************************************************/
711 /**********************************************************************/
712 static NOINLINE smallint lzo_decompress(const header_t *h)
714 unsigned block_size = LZO_BLOCK_SIZE;
716 uint32_t src_len, dst_len;
717 uint32_t c_adler32 = ADLER32_INIT_VALUE;
718 uint32_t d_adler32 = ADLER32_INIT_VALUE;
719 uint32_t c_crc32 = CRC32_INIT_VALUE, d_crc32 = CRC32_INIT_VALUE;
722 uint32_t mcs_block_size = MAX_COMPRESSED_SIZE(block_size);
728 /* read uncompressed block size */
731 /* exit if last block */
735 /* error if split file */
736 if (dst_len == 0xffffffffL)
737 /* should not happen - not yet implemented */
738 bb_error_msg_and_die("this file is a split lzop file");
740 if (dst_len > MAX_BLOCK_SIZE)
741 bb_error_msg_and_die("corrupted data");
743 /* read compressed block size */
745 if (src_len <= 0 || src_len > dst_len)
746 bb_error_msg_and_die("corrupted data");
748 if (dst_len > block_size) {
754 block_size = dst_len;
755 mcs_block_size = MAX_COMPRESSED_SIZE(block_size);
758 /* read checksum of uncompressed block */
759 if (h->flags & F_ADLER32_D)
760 d_adler32 = read32();
761 if (h->flags & F_CRC32_D)
764 /* read checksum of compressed block */
765 if (src_len < dst_len) {
766 if (h->flags & F_ADLER32_C)
767 c_adler32 = read32();
768 if (h->flags & F_CRC32_C)
773 b2 = xzalloc(mcs_block_size);
774 /* read the block into the end of our buffer */
775 b1 = b2 + mcs_block_size - src_len;
776 xread(0, b1, src_len);
778 if (src_len < dst_len) {
779 unsigned d = dst_len;
781 if (!(option_mask32 & OPT_F)) {
782 /* verify checksum of compressed block */
783 if (h->flags & F_ADLER32_C)
784 lzo_check(lzo_adler32, c_adler32,
787 if (h->flags & F_CRC32_C)
788 lzo_check(lzo_crc32, c_crc32,
794 // if (option_mask32 & OPT_F)
795 // r = lzo1x_decompress(b1, src_len, b2, &d, NULL);
797 r = lzo1x_decompress_safe(b1, src_len, b2, &d, NULL);
799 if (r != 0 /*LZO_E_OK*/ || dst_len != d) {
800 bb_error_msg_and_die("corrupted data");
804 /* "stored" block => no decompression */
808 if (!(option_mask32 & OPT_F)) {
809 /* verify checksum of uncompressed block */
810 if (h->flags & F_ADLER32_D)
811 lzo_check(lzo_adler32, d_adler32, ADLER32_INIT_VALUE,
813 if (h->flags & F_CRC32_D)
814 lzo_check(lzo_crc32, d_crc32, CRC32_INIT_VALUE,
818 /* write uncompressed block data */
819 xwrite(1, dst, dst_len);
826 /**********************************************************************/
827 // lzop file signature (shamelessly borrowed from PNG)
828 /**********************************************************************/
830 * The first nine bytes of a lzop file always contain the following values:
833 * --- --- --- --- --- --- --- --- ---
834 * (hex) 89 4c 5a 4f 00 0d 0a 1a 0a
835 * (decimal) 137 76 90 79 0 13 10 26 10
836 * (C notation - ASCII) \211 L Z O \0 \r \n \032 \n
839 /* (vda) comparison with lzop v1.02rc1 ("lzop -1 <FILE" cmd):
840 * Only slight differences in header:
841 * -00000000 89 4c 5a 4f 00 0d 0a 1a 0a 10 20 20 20 09 40 02
842 * +00000000 89 4c 5a 4f 00 0d 0a 1a 0a 10 10 20 30 09 40 02
844 * version lib_version
845 * -00000010 01 03 00 00 0d 00 00 81 a4 49 f7 a6 3f 00 00 00
846 * +00000010 01 03 00 00 01 00 00 00 00 00 00 00 00 00 00 00
847 * ^^^^^^^^^^^ ^^^^^^^^^^^ ^^^^^^^^^^^
849 * -00000020 00 00 2d 67 04 17 00 04 00 00 00 03 ed ec 9d 6d
850 * +00000020 00 00 10 5f 00 c1 00 04 00 00 00 03 ed ec 9d 6d
853 * The rest is identical.
855 static const unsigned char lzop_magic[9] = {
856 0x89, 0x4c, 0x5a, 0x4f, 0x00, 0x0d, 0x0a, 0x1a, 0x0a
859 /* This coding is derived from Alexander Lehmann's pngcheck code. */
860 static void check_magic(void)
862 unsigned char magic[sizeof(lzop_magic)];
863 xread(0, magic, sizeof(magic));
864 if (memcmp(magic, lzop_magic, sizeof(lzop_magic)) != 0)
865 bb_error_msg_and_die("bad magic number");
868 /**********************************************************************/
870 /**********************************************************************/
871 static void write_header(const header_t *h)
875 xwrite(1, lzop_magic, sizeof(lzop_magic));
877 init_chksum(&G.chksum_out);
879 f_write16(h->version);
880 f_write16(h->lib_version);
881 f_write16(h->version_needed_to_extract);
887 f_write32(h->gmtdiff);
889 l = (int) strlen(h->name);
894 f_write32(chksum_getresult(&G.chksum_out, h));
897 static int read_header(header_t *h)
903 memset(h, 0, sizeof(*h));
904 h->version_needed_to_extract = 0x0900; /* first lzop version */
907 init_chksum(&G.chksum_in);
909 h->version = f_read16();
910 if (h->version < 0x0900)
912 h->lib_version = f_read16();
913 if (h->version >= 0x0940) {
914 h->version_needed_to_extract = f_read16();
915 if (h->version_needed_to_extract > LZOP_VERSION)
917 if (h->version_needed_to_extract < 0x0900)
920 h->method = f_read8();
921 if (h->version >= 0x0940)
922 h->level = f_read8();
923 h->flags = f_read32();
924 if (h->flags & F_H_FILTER)
925 return 16; /* filter not supported */
926 h->mode = f_read32();
927 h->mtime = f_read32();
928 if (h->version >= 0x0940)
929 h->gmtdiff = f_read32();
936 checksum = chksum_getresult(&G.chksum_in, h);
937 h->header_checksum = f_read32();
938 if (h->header_checksum != checksum)
943 r = lzo_get_method(h);
947 /* check reserved flags */
948 if (h->flags & F_RESERVED)
951 /* skip extra field [not used yet] */
952 if (h->flags & F_H_EXTRA_FIELD) {
955 /* note: the checksum also covers the length */
956 init_chksum(&G.chksum_in);
957 h->extra_field_len = f_read32();
958 for (k = 0; k < h->extra_field_len; k++)
960 checksum = chksum_getresult(&G.chksum_in, h);
961 h->extra_field_checksum = f_read32();
962 if (h->extra_field_checksum != checksum)
969 static void p_header(header_t *h)
976 bb_error_msg_and_die("header_error %d", r);
979 /**********************************************************************/
981 /**********************************************************************/
982 static void lzo_set_method(header_t *h)
986 if (option_mask32 & OPT_1) {
987 h->method = M_LZO1X_1_15;
988 } else if (option_mask32 & OPT_789) {
989 #if ENABLE_LZOP_COMPR_HIGH
990 h->method = M_LZO1X_999;
991 if (option_mask32 & OPT_7)
993 else if (option_mask32 & OPT_8)
998 bb_error_msg_and_die("high compression not compiled in");
1000 } else { /* levels 2..6 or none (defaults to level 3) */
1001 h->method = M_LZO1X_1;
1002 level = 5; /* levels 2-6 are actually the same */
1008 static smallint do_lzo_compress(void)
1013 memset(h, 0, sizeof(*h));
1017 h->version = (LZOP_VERSION & 0xffff);
1018 h->version_needed_to_extract = 0x0940;
1019 h->lib_version = lzo_version() & 0xffff;
1021 h->flags = (F_OS & F_OS_MASK) | (F_CS & F_CS_MASK);
1023 if (!(option_mask32 & OPT_F) || h->method == M_LZO1X_999) {
1024 h->flags |= F_ADLER32_D;
1025 if (option_mask32 & OPT_C)
1026 h->flags |= F_ADLER32_C;
1029 return lzo_compress(h);
1033 /**********************************************************************/
1035 /**********************************************************************/
1036 static smallint do_lzo_decompress(void)
1042 return lzo_decompress(&header);
1045 static char* make_new_name_lzop(char *filename)
1047 if (option_mask32 & OPT_DECOMPRESS) {
1048 char *extension = strrchr(filename, '.');
1049 if (!extension || strcmp(extension + 1, "lzo") != 0)
1050 return xasprintf("%s.out", filename);
1054 return xasprintf("%s.lzo", filename);
1057 static IF_DESKTOP(long long) int pack_lzop(unpack_info_t *info UNUSED_PARAM)
1059 if (option_mask32 & OPT_DECOMPRESS)
1060 return do_lzo_decompress();
1061 return do_lzo_compress();
1064 int lzop_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1065 int lzop_main(int argc UNUSED_PARAM, char **argv)
1067 getopt32(argv, OPTION_STRING);
1070 if (applet_name[4] == 'c')
1071 option_mask32 |= (OPT_STDOUT | OPT_DECOMPRESS);
1073 if (applet_name[0] == 'u')
1074 option_mask32 |= OPT_DECOMPRESS;
1076 G.lzo_crc32_table = crc32_filltable(NULL, 0);
1077 return bbunpack(argv, make_new_name_lzop, pack_lzop);