archival/lzop.c

   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 //kbuild:lib-$(CONFIG_LZOP) += lzop.o
  29
  30 //usage:#define lzop_trivial_usage
  31 //usage:       "[-cfvd123456789CF] [FILE]..."
  32 //usage:#define lzop_full_usage "\n\n"
  33 //usage:       "        -1..9   Compression level"
  34 //usage:     "\n        -d      Decompress"
  35 //usage:     "\n        -c      Write to stdout"
  36 //usage:     "\n        -f      Force"
  37 //usage:     "\n        -v      Verbose"
  38 //usage:     "\n        -F      Don't store or verify checksum"
  39 //usage:     "\n        -C      Also write checksum of compressed block"
  40 //usage:
  41 //usage:#define lzopcat_trivial_usage
  42 //usage:       "[-vCF] [FILE]..."
  43 //usage:#define lzopcat_full_usage "\n\n"
  44 //usage:       "        -v      Verbose"
  45 //usage:     "\n        -F      Don't store or verify checksum"
  46 //usage:
  47 //usage:#define unlzop_trivial_usage
  48 //usage:       "[-cfvCF] [FILE]..."
  49 //usage:#define unlzop_full_usage "\n\n"
  50 //usage:       "        -c      Write to stdout"
  51 //usage:     "\n        -f      Force"
  52 //usage:     "\n        -v      Verbose"
  53 //usage:     "\n        -F      Don't store or verify checksum"
  54
  55 #include "libbb.h"
  56 #include "bb_archive.h"
  57 #include "liblzo_interface.h"
  58
  59 /* lzo-2.03/src/lzo_ptr.h */
  60 #define pd(a,b)  ((unsigned)((a)-(b)))
  61
  62 #define lzo_version()                   LZO_VERSION
  63 #define lzo_sizeof_dict_t               (sizeof(uint8_t*))
  64
  65 /* lzo-2.03/include/lzo/lzo1x.h */
  66 #define LZO1X_1_MEM_COMPRESS    (16384 * lzo_sizeof_dict_t)
  67 #define LZO1X_1_15_MEM_COMPRESS (32768 * lzo_sizeof_dict_t)
  68 #define LZO1X_999_MEM_COMPRESS  (14 * 16384 * sizeof(short))
  69
  70 /* lzo-2.03/src/lzo1x_oo.c */
  71 #define NO_LIT UINT_MAX
  72
  73 /**********************************************************************/
  74 static void copy2(uint8_t* ip, const uint8_t* m_pos, unsigned off)
  75 {
  76         ip[0] = m_pos[0];
  77         if (off == 1)
  78                 ip[1] = m_pos[0];
  79         else
  80                 ip[1] = m_pos[1];
  81 }
  82
  83 static void copy3(uint8_t* ip, const uint8_t* m_pos, unsigned off)
  84 {
  85         ip[0] = m_pos[0];
  86         if (off == 1) {
  87                 ip[2] = ip[1] = m_pos[0];
  88         }
  89         else if (off == 2) {
  90                 ip[1] = m_pos[1];
  91                 ip[2] = m_pos[0];
  92         }
  93         else {
  94                 ip[1] = m_pos[1];
  95                 ip[2] = m_pos[2];
  96         }
  97 }
  98
  99 /**********************************************************************/
 100 // optimize a block of data.
 101 /**********************************************************************/
 102 #define TEST_IP         (ip < ip_end)
 103 #define TEST_OP         (op <= op_end)
 104
 105 static NOINLINE int lzo1x_optimize(uint8_t *in, unsigned in_len,
 106                 uint8_t *out, unsigned *out_len,
 107                 void* wrkmem UNUSED_PARAM)
 108 {
 109         uint8_t* op;
 110         uint8_t* ip;
 111         unsigned t;
 112         uint8_t* m_pos;
 113         uint8_t* const ip_end = in + in_len;
 114         uint8_t* const op_end = out + *out_len;
 115         uint8_t* litp = NULL;
 116         unsigned lit = 0;
 117         unsigned next_lit = NO_LIT;
 118         unsigned nl;
 119         unsigned long o_m1_a = 0, o_m1_b = 0, o_m2 = 0, o_m3_a = 0, o_m3_b = 0;
 120
 121 //      LZO_UNUSED(wrkmem);
 122
 123         *out_len = 0;
 124
 125         op = out;
 126         ip = in;
 127
 128         if (*ip > 17) {
 129                 t = *ip++ - 17;
 130                 if (t < 4)
 131                         goto match_next;
 132                 goto first_literal_run;
 133         }
 134
 135         while (TEST_IP && TEST_OP) {
 136                 t = *ip++;
 137                 if (t >= 16)
 138                         goto match;
 139                 /* a literal run */
 140                 litp = ip - 1;
 141                 if (t == 0) {
 142                         t = 15;
 143                         while (*ip == 0)
 144                                 t += 255, ip++;
 145                         t += *ip++;
 146                 }
 147                 lit = t + 3;
 148                 /* copy literals */
 149  copy_literal_run:
 150                 *op++ = *ip++;
 151                 *op++ = *ip++;
 152                 *op++ = *ip++;
 153  first_literal_run:
 154                 do *op++ = *ip++; while (--t > 0);
 155
 156                 t = *ip++;
 157
 158                 if (t >= 16)
 159                         goto match;
 160 #if defined(LZO1X)
 161                 m_pos = op - 1 - 0x800;
 162 #elif defined(LZO1Y)
 163                 m_pos = op - 1 - 0x400;
 164 #endif
 165                 m_pos -= t >> 2;
 166                 m_pos -= *ip++ << 2;
 167                 *op++ = *m_pos++;
 168                 *op++ = *m_pos++;
 169                 *op++ = *m_pos++;
 170                 lit = 0;
 171                 goto match_done;
 172
 173
 174                 /* handle matches */
 175                 do {
 176                         if (t < 16) { /* a M1 match */
 177                                 m_pos = op - 1;
 178                                 m_pos -= t >> 2;
 179                                 m_pos -= *ip++ << 2;
 180
 181                                 if (litp == NULL)
 182                                         goto copy_m1;
 183
 184                                 nl = ip[-2] & 3;
 185                                 /* test if a match follows */
 186                                 if (nl == 0 && lit == 1 && ip[0] >= 16) {
 187                                         next_lit = nl;
 188                                         /* adjust length of previous short run */
 189                                         lit += 2;
 190                                         *litp = (unsigned char)((*litp & ~3) | lit);
 191                                         /* copy over the 2 literals that replace the match */
 192                                         copy2(ip-2, m_pos, pd(op, m_pos));
 193                                         o_m1_a++;
 194                                 }
 195                                 /* test if a literal run follows */
 196                                 else
 197                                 if (nl == 0
 198                                  && ip[0] < 16
 199                                  && ip[0] != 0
 200                                  && (lit + 2 + ip[0] < 16)
 201                                 ) {
 202                                         t = *ip++;
 203                                         /* remove short run */
 204                                         *litp &= ~3;
 205                                         /* copy over the 2 literals that replace the match */
 206                                         copy2(ip-3+1, m_pos, pd(op, m_pos));
 207                                         /* move literals 1 byte ahead */
 208                                         litp += 2;
 209                                         if (lit > 0)
 210                                                 memmove(litp+1, litp, lit);
 211                                         /* insert new length of long literal run */
 212                                         lit += 2 + t + 3;
 213                                         *litp = (unsigned char)(lit - 3);
 214
 215                                         o_m1_b++;
 216                                         *op++ = *m_pos++;
 217                                         *op++ = *m_pos++;
 218                                         goto copy_literal_run;
 219                                 }
 220  copy_m1:
 221                                 *op++ = *m_pos++;
 222                                 *op++ = *m_pos++;
 223                         } else {
 224  match:
 225                                 if (t >= 64) {                          /* a M2 match */
 226                                         m_pos = op - 1;
 227 #if defined(LZO1X)
 228                                         m_pos -= (t >> 2) & 7;
 229                                         m_pos -= *ip++ << 3;
 230                                         t = (t >> 5) - 1;
 231 #elif defined(LZO1Y)
 232                                         m_pos -= (t >> 2) & 3;
 233                                         m_pos -= *ip++ << 2;
 234                                         t = (t >> 4) - 3;
 235 #endif
 236                                         if (litp == NULL)
 237                                                 goto copy_m;
 238
 239                                         nl = ip[-2] & 3;
 240                                         /* test if in beetween two long literal runs */
 241                                         if (t == 1 && lit > 3 && nl == 0
 242                                          && ip[0] < 16 && ip[0] != 0 && (lit + 3 + ip[0] < 16)
 243                                         ) {
 244                                                 t = *ip++;
 245                                                 /* copy over the 3 literals that replace the match */
 246                                                 copy3(ip-1-2, m_pos, pd(op, m_pos));
 247                                                 /* set new length of previous literal run */
 248                                                 lit += 3 + t + 3;
 249                                                 *litp = (unsigned char)(lit - 3);
 250                                                 o_m2++;
 251                                                 *op++ = *m_pos++;
 252                                                 *op++ = *m_pos++;
 253                                                 *op++ = *m_pos++;
 254                                                 goto copy_literal_run;
 255                                         }
 256                                 } else {
 257                                         if (t >= 32) {                  /* a M3 match */
 258                                                 t &= 31;
 259                                                 if (t == 0) {
 260                                                         t = 31;
 261                                                         while (*ip == 0)
 262                                                                 t += 255, ip++;
 263                                                         t += *ip++;
 264                                                 }
 265                                                 m_pos = op - 1;
 266                                                 m_pos -= *ip++ >> 2;
 267                                                 m_pos -= *ip++ << 6;
 268                                         } else {                                        /* a M4 match */
 269                                                 m_pos = op;
 270                                                 m_pos -= (t & 8) << 11;
 271                                                 t &= 7;
 272                                                 if (t == 0) {
 273                                                         t = 7;
 274                                                         while (*ip == 0)
 275                                                                 t += 255, ip++;
 276                                                         t += *ip++;
 277                                                 }
 278                                                 m_pos -= *ip++ >> 2;
 279                                                 m_pos -= *ip++ << 6;
 280                                                 if (m_pos == op)
 281                                                         goto eof_found;
 282                                                 m_pos -= 0x4000;
 283                                         }
 284                                         if (litp == NULL)
 285                                                 goto copy_m;
 286
 287                                         nl = ip[-2] & 3;
 288                                         /* test if in beetween two matches */
 289                                         if (t == 1 && lit == 0 && nl == 0 && ip[0] >= 16) {
 290                                                 next_lit = nl;
 291                                                 /* make a previous short run */
 292                                                 lit += 3;
 293                                                 *litp = (unsigned char)((*litp & ~3) | lit);
 294                                                 /* copy over the 3 literals that replace the match */
 295                                                 copy3(ip-3, m_pos, pd(op, m_pos));
 296                                                 o_m3_a++;
 297                                         }
 298                                         /* test if a literal run follows */
 299                                         else if (t == 1 && lit <= 3 && nl == 0
 300                                          && ip[0] < 16 && ip[0] != 0 && (lit + 3 + ip[0] < 16)
 301                                         ) {
 302                                                 t = *ip++;
 303                                                 /* remove short run */
 304                                                 *litp &= ~3;
 305                                                 /* copy over the 3 literals that replace the match */
 306                                                 copy3(ip-4+1, m_pos, pd(op, m_pos));
 307                                                 /* move literals 1 byte ahead */
 308                                                 litp += 2;
 309                                                 if (lit > 0)
 310                                                         memmove(litp+1,litp,lit);
 311                                                 /* insert new length of long literal run */
 312                                                 lit += 3 + t + 3;
 313                                                 *litp = (unsigned char)(lit - 3);
 314
 315                                                 o_m3_b++;
 316                                                 *op++ = *m_pos++;
 317                                                 *op++ = *m_pos++;
 318                                                 *op++ = *m_pos++;
 319                                                 goto copy_literal_run;
 320                                         }
 321                                 }
 322  copy_m:
 323                                 *op++ = *m_pos++;
 324                                 *op++ = *m_pos++;
 325                                 do *op++ = *m_pos++; while (--t > 0);
 326                         }
 327
 328  match_done:
 329                         if (next_lit == NO_LIT) {
 330                                 t = ip[-2] & 3;
 331                                 lit = t;
 332                                 litp = ip - 2;
 333                         }
 334                         else
 335                                 t = next_lit;
 336                         next_lit = NO_LIT;
 337                         if (t == 0)
 338                                 break;
 339                         /* copy literals */
 340  match_next:
 341                         do *op++ = *ip++; while (--t > 0);
 342                         t = *ip++;
 343                 } while (TEST_IP && TEST_OP);
 344         }
 345
 346         /* no EOF code was found */
 347         *out_len = pd(op, out);
 348         return LZO_E_EOF_NOT_FOUND;
 349
 350  eof_found:
 351 //      LZO_UNUSED(o_m1_a); LZO_UNUSED(o_m1_b); LZO_UNUSED(o_m2);
 352 //      LZO_UNUSED(o_m3_a); LZO_UNUSED(o_m3_b);
 353         *out_len = pd(op, out);
 354         return (ip == ip_end ? LZO_E_OK :
 355                 (ip < ip_end ? LZO_E_INPUT_NOT_CONSUMED : LZO_E_INPUT_OVERRUN));
 356 }
 357
 358 /**********************************************************************/
 359 #define F_OS F_OS_UNIX
 360 #define F_CS F_CS_NATIVE
 361
 362 /**********************************************************************/
 363 #define ADLER32_INIT_VALUE 1
 364 #define CRC32_INIT_VALUE   0
 365
 366 /**********************************************************************/
 367 enum {
 368         M_LZO1X_1    = 1,
 369         M_LZO1X_1_15 = 2,
 370         M_LZO1X_999  = 3,
 371 };
 372
 373 /**********************************************************************/
 374 /* header flags */
 375 #define F_ADLER32_D     0x00000001L
 376 #define F_ADLER32_C     0x00000002L
 377 #define F_H_EXTRA_FIELD 0x00000040L
 378 #define F_H_GMTDIFF     0x00000080L
 379 #define F_CRC32_D       0x00000100L
 380 #define F_CRC32_C       0x00000200L
 381 #define F_H_FILTER      0x00000800L
 382 #define F_H_CRC32       0x00001000L
 383 #define F_MASK          0x00003FFFL
 384
 385 /* operating system & file system that created the file [mostly unused] */
 386 #define F_OS_UNIX       0x03000000L
 387 #define F_OS_SHIFT      24
 388 #define F_OS_MASK       0xff000000L
 389
 390 /* character set for file name encoding [mostly unused] */
 391 #define F_CS_NATIVE     0x00000000L
 392 #define F_CS_SHIFT      20
 393 #define F_CS_MASK       0x00f00000L
 394
 395 /* these bits must be zero */
 396 #define F_RESERVED      ((F_MASK | F_OS_MASK | F_CS_MASK) ^ 0xffffffffL)
 397
 398 typedef struct chksum_t {
 399         uint32_t f_adler32;
 400         uint32_t f_crc32;
 401 } chksum_t;
 402
 403 typedef struct header_t {
 404         unsigned version;
 405         unsigned lib_version;
 406         unsigned version_needed_to_extract;
 407         uint32_t flags;
 408         uint32_t mode;
 409         uint32_t mtime;
 410         uint32_t gmtdiff;
 411         uint32_t header_checksum;
 412
 413         uint32_t extra_field_len;
 414         uint32_t extra_field_checksum;
 415
 416         unsigned char method;
 417         unsigned char level;
 418
 419         /* info */
 420         char name[255+1];
 421 } header_t;
 422
 423 struct globals {
 424         /*const uint32_t *lzo_crc32_table;*/
 425         chksum_t chksum_in;
 426         chksum_t chksum_out;
 427 } FIX_ALIASING;
 428 #define G (*(struct globals*)&bb_common_bufsiz1)
 429 #define INIT_G() do { } while (0)
 430 //#define G (*ptr_to_globals)
 431 //#define INIT_G() do {
 432 //      SET_PTR_TO_GLOBALS(xzalloc(sizeof(G)));
 433 //} while (0)
 434
 435
 436 /**********************************************************************/
 437 #define LZOP_VERSION            0x1010
 438 //#define LZOP_VERSION_STRING     "1.01"
 439 //#define LZOP_VERSION_DATE       "Apr 27th 2003"
 440
 441 #define OPTION_STRING "cfvqdt123456789CF"
 442
 443 /* Note: must be kept in sync with archival/bbunzip.c */
 444 enum {
 445         OPT_STDOUT      = (1 << 0),
 446         OPT_FORCE       = (1 << 1),
 447         OPT_VERBOSE     = (1 << 2),
 448         OPT_QUIET       = (1 << 3),
 449         OPT_DECOMPRESS  = (1 << 4),
 450         OPT_TEST        = (1 << 5),
 451         OPT_1           = (1 << 6),
 452         OPT_2           = (1 << 7),
 453         OPT_3           = (1 << 8),
 454         OPT_4           = (1 << 9),
 455         OPT_5           = (1 << 10),
 456         OPT_6           = (1 << 11),
 457         OPT_789         = (7 << 12),
 458         OPT_7           = (1 << 13),
 459         OPT_8           = (1 << 14),
 460         OPT_C           = (1 << 15),
 461         OPT_F           = (1 << 16),
 462 };
 463
 464 /**********************************************************************/
 465 // adler32 checksum
 466 // adapted from free code by Mark Adler <madler@alumni.caltech.edu>
 467 // see http://www.zlib.org/
 468 /**********************************************************************/
 469 static FAST_FUNC uint32_t
 470 lzo_adler32(uint32_t adler, const uint8_t* buf, unsigned len)
 471 {
 472         enum {
 473                 LZO_BASE = 65521, /* largest prime smaller than 65536 */
 474                 /* NMAX is the largest n such that
 475                  * 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
 476                 LZO_NMAX = 5552,
 477         };
 478         uint32_t s1 = adler & 0xffff;
 479         uint32_t s2 = (adler >> 16) & 0xffff;
 480         unsigned k;
 481
 482         if (buf == NULL)
 483                 return 1;
 484
 485         while (len > 0) {
 486                 k = len < LZO_NMAX ? (unsigned) len : LZO_NMAX;
 487                 len -= k;
 488                 if (k != 0) do {
 489                         s1 += *buf++;
 490                         s2 += s1;
 491                 } while (--k > 0);
 492                 s1 %= LZO_BASE;
 493                 s2 %= LZO_BASE;
 494         }
 495         return (s2 << 16) | s1;
 496 }
 497
 498 static FAST_FUNC uint32_t
 499 lzo_crc32(uint32_t c, const uint8_t* buf, unsigned len)
 500 {
 501         //if (buf == NULL) - impossible
 502         //      return 0;
 503
 504         return ~crc32_block_endian0(~c, buf, len, global_crc32_table);
 505 }
 506
 507 /**********************************************************************/
 508 static void init_chksum(chksum_t *ct)
 509 {
 510         ct->f_adler32 = ADLER32_INIT_VALUE;
 511         ct->f_crc32 = CRC32_INIT_VALUE;
 512 }
 513
 514 static void add_bytes_to_chksum(chksum_t *ct, const void* buf, int cnt)
 515 {
 516         /* We need to handle the two checksums at once, because at the
 517          * beginning of the header, we don't know yet which one we'll
 518          * eventually need */
 519         ct->f_adler32 = lzo_adler32(ct->f_adler32, (const uint8_t*)buf, cnt);
 520         ct->f_crc32 = lzo_crc32(ct->f_crc32, (const uint8_t*)buf, cnt);
 521 }
 522
 523 static uint32_t chksum_getresult(chksum_t *ct, const header_t *h)
 524 {
 525         return (h->flags & F_H_CRC32) ? ct->f_crc32 : ct->f_adler32;
 526 }
 527
 528 /**********************************************************************/
 529 static uint32_t read32(void)
 530 {
 531         uint32_t v;
 532         xread(0, &v, 4);
 533         return ntohl(v);
 534 }
 535
 536 static void write32(uint32_t v)
 537 {
 538         v = htonl(v);
 539         xwrite(1, &v, 4);
 540 }
 541
 542 static void f_write(const void* buf, int cnt)
 543 {
 544         xwrite(1, buf, cnt);
 545         add_bytes_to_chksum(&G.chksum_out, buf, cnt);
 546 }
 547
 548 static void f_read(void* buf, int cnt)
 549 {
 550         xread(0, buf, cnt);
 551         add_bytes_to_chksum(&G.chksum_in, buf, cnt);
 552 }
 553
 554 static int f_read8(void)
 555 {
 556         uint8_t v;
 557         f_read(&v, 1);
 558         return v;
 559 }
 560
 561 static void f_write8(uint8_t v)
 562 {
 563         f_write(&v, 1);
 564 }
 565
 566 static unsigned f_read16(void)
 567 {
 568         uint16_t v;
 569         f_read(&v, 2);
 570         return ntohs(v);
 571 }
 572
 573 static void f_write16(uint16_t v)
 574 {
 575         v = htons(v);
 576         f_write(&v, 2);
 577 }
 578
 579 static uint32_t f_read32(void)
 580 {
 581         uint32_t v;
 582         f_read(&v, 4);
 583         return ntohl(v);
 584 }
 585
 586 static void f_write32(uint32_t v)
 587 {
 588         v = htonl(v);
 589         f_write(&v, 4);
 590 }
 591
 592 /**********************************************************************/
 593 static int lzo_get_method(header_t *h)
 594 {
 595         /* check method */
 596         if (h->method == M_LZO1X_1) {
 597                 if (h->level == 0)
 598                         h->level = 3;
 599         } else if (h->method == M_LZO1X_1_15) {
 600                 if (h->level == 0)
 601                         h->level = 1;
 602         } else if (h->method == M_LZO1X_999) {
 603                 if (h->level == 0)
 604                         h->level = 9;
 605         } else
 606                 return -1;              /* not a LZO method */
 607
 608         /* check compression level */
 609         if (h->level < 1 || h->level > 9)
 610                 return 15;
 611
 612         return 0;
 613 }
 614
 615 /**********************************************************************/
 616 #define LZO_BLOCK_SIZE  (256 * 1024l)
 617 #define MAX_BLOCK_SIZE  (64 * 1024l * 1024l)    /* DO NOT CHANGE */
 618
 619 /* LZO may expand uncompressible data by a small amount */
 620 #define MAX_COMPRESSED_SIZE(x)  ((x) + (x) / 16 + 64 + 3)
 621
 622 /**********************************************************************/
 623 // compress a file
 624 /**********************************************************************/
 625 static NOINLINE smallint lzo_compress(const header_t *h)
 626 {
 627         unsigned block_size = LZO_BLOCK_SIZE;
 628         int r = 0; /* LZO_E_OK */
 629         uint8_t *const b1 = xzalloc(block_size);
 630         uint8_t *const b2 = xzalloc(MAX_COMPRESSED_SIZE(block_size));
 631         unsigned src_len = 0, dst_len = 0;
 632         uint32_t d_adler32 = ADLER32_INIT_VALUE;
 633         uint32_t d_crc32 = CRC32_INIT_VALUE;
 634         int l;
 635         smallint ok = 1;
 636         uint8_t *wrk_mem = NULL;
 637
 638         if (h->method == M_LZO1X_1)
 639                 wrk_mem = xzalloc(LZO1X_1_MEM_COMPRESS);
 640         else if (h->method == M_LZO1X_1_15)
 641                 wrk_mem = xzalloc(LZO1X_1_15_MEM_COMPRESS);
 642         else if (h->method == M_LZO1X_999)
 643                 wrk_mem = xzalloc(LZO1X_999_MEM_COMPRESS);
 644
 645         for (;;) {
 646                 /* read a block */
 647                 l = full_read(0, b1, block_size);
 648                 src_len = (l > 0 ? l : 0);
 649
 650                 /* write uncompressed block size */
 651                 write32(src_len);
 652
 653                 /* exit if last block */
 654                 if (src_len == 0)
 655                         break;
 656
 657                 /* compute checksum of uncompressed block */
 658                 if (h->flags & F_ADLER32_D)
 659                         d_adler32 = lzo_adler32(ADLER32_INIT_VALUE, b1, src_len);
 660                 if (h->flags & F_CRC32_D)
 661                         d_crc32 = lzo_crc32(CRC32_INIT_VALUE, b1, src_len);
 662
 663                 /* compress */
 664                 if (h->method == M_LZO1X_1)
 665                         r = lzo1x_1_compress(b1, src_len, b2, &dst_len, wrk_mem);
 666                 else if (h->method == M_LZO1X_1_15)
 667                         r = lzo1x_1_15_compress(b1, src_len, b2, &dst_len, wrk_mem);
 668 #if ENABLE_LZOP_COMPR_HIGH
 669                 else if (h->method == M_LZO1X_999)
 670                         r = lzo1x_999_compress_level(b1, src_len, b2, &dst_len,
 671                                                 wrk_mem, h->level);
 672 #endif
 673                 else
 674                         bb_error_msg_and_die("internal error");
 675
 676                 if (r != 0) /* not LZO_E_OK */
 677                         bb_error_msg_and_die("internal error - compression failed");
 678
 679                 /* write compressed block size */
 680                 if (dst_len < src_len) {
 681                         /* optimize */
 682                         if (h->method == M_LZO1X_999) {
 683                                 unsigned new_len = src_len;
 684                                 r = lzo1x_optimize(b2, dst_len, b1, &new_len, NULL);
 685                                 if (r != 0 /*LZO_E_OK*/ || new_len != src_len)
 686                                         bb_error_msg_and_die("internal error - optimization failed");
 687                         }
 688                         write32(dst_len);
 689                 } else {
 690                         /* data actually expanded => store data uncompressed */
 691                         write32(src_len);
 692                 }
 693
 694                 /* write checksum of uncompressed block */
 695                 if (h->flags & F_ADLER32_D)
 696                         write32(d_adler32);
 697                 if (h->flags & F_CRC32_D)
 698                         write32(d_crc32);
 699
 700                 if (dst_len < src_len) {
 701                         /* write checksum of compressed block */
 702                         if (h->flags & F_ADLER32_C)
 703                                 write32(lzo_adler32(ADLER32_INIT_VALUE, b2, dst_len));
 704                         if (h->flags & F_CRC32_C)
 705                                 write32(lzo_crc32(CRC32_INIT_VALUE, b2, dst_len));
 706                         /* write compressed block data */
 707                         xwrite(1, b2, dst_len);
 708                 } else {
 709                         /* write uncompressed block data */
 710                         xwrite(1, b1, src_len);
 711                 }
 712         }
 713
 714         free(wrk_mem);
 715         free(b1);
 716         free(b2);
 717         return ok;
 718 }
 719
 720 static FAST_FUNC void lzo_check(
 721                 uint32_t init,
 722                 uint8_t* buf, unsigned len,
 723                 uint32_t FAST_FUNC (*fn)(uint32_t, const uint8_t*, unsigned),
 724                 uint32_t ref)
 725 {
 726         /* This function, by having the same order of parameters
 727          * as fn, and by being marked FAST_FUNC (same as fn),
 728          * saves a dozen bytes of code.
 729          */
 730         uint32_t c = fn(init, buf, len);
 731         if (c != ref)
 732                 bb_error_msg_and_die("checksum error");
 733 }
 734
 735 /**********************************************************************/
 736 // decompress a file
 737 /**********************************************************************/
 738 static NOINLINE smallint lzo_decompress(const header_t *h)
 739 {
 740         unsigned block_size = LZO_BLOCK_SIZE;
 741         int r;
 742         uint32_t src_len, dst_len;
 743         uint32_t c_adler32 = ADLER32_INIT_VALUE;
 744         uint32_t d_adler32 = ADLER32_INIT_VALUE;
 745         uint32_t c_crc32 = CRC32_INIT_VALUE, d_crc32 = CRC32_INIT_VALUE;
 746         smallint ok = 1;
 747         uint8_t *b1;
 748         uint32_t mcs_block_size = MAX_COMPRESSED_SIZE(block_size);
 749         uint8_t *b2 = NULL;
 750
 751         for (;;) {
 752                 uint8_t *dst;
 753
 754                 /* read uncompressed block size */
 755                 dst_len = read32();
 756
 757                 /* exit if last block */
 758                 if (dst_len == 0)
 759                         break;
 760
 761                 /* error if split file */
 762                 if (dst_len == 0xffffffffL)
 763                         /* should not happen - not yet implemented */
 764                         bb_error_msg_and_die("this file is a split lzop file");
 765
 766                 if (dst_len > MAX_BLOCK_SIZE)
 767                         bb_error_msg_and_die("corrupted data");
 768
 769                 /* read compressed block size */
 770                 src_len = read32();
 771                 if (src_len <= 0 || src_len > dst_len)
 772                         bb_error_msg_and_die("corrupted data");
 773
 774                 if (dst_len > block_size) {
 775                         if (b2) {
 776                                 free(b2);
 777                                 b2 = NULL;
 778                         }
 779                         block_size = dst_len;
 780                         mcs_block_size = MAX_COMPRESSED_SIZE(block_size);
 781                 }
 782
 783                 /* read checksum of uncompressed block */
 784                 if (h->flags & F_ADLER32_D)
 785                         d_adler32 = read32();
 786                 if (h->flags & F_CRC32_D)
 787                         d_crc32 = read32();
 788
 789                 /* read checksum of compressed block */
 790                 if (src_len < dst_len) {
 791                         if (h->flags & F_ADLER32_C)
 792                                 c_adler32 = read32();
 793                         if (h->flags & F_CRC32_C)
 794                                 c_crc32 = read32();
 795                 }
 796
 797                 if (b2 == NULL)
 798                         b2 = xzalloc(mcs_block_size);
 799                 /* read the block into the end of our buffer */
 800                 b1 = b2 + mcs_block_size - src_len;
 801                 xread(0, b1, src_len);
 802
 803                 if (src_len < dst_len) {
 804                         unsigned d = dst_len;
 805
 806                         if (!(option_mask32 & OPT_F)) {
 807                                 /* verify checksum of compressed block */
 808                                 if (h->flags & F_ADLER32_C)
 809                                         lzo_check(ADLER32_INIT_VALUE,
 810                                                         b1, src_len,
 811                                                         lzo_adler32, c_adler32);
 812                                 if (h->flags & F_CRC32_C)
 813                                         lzo_check(CRC32_INIT_VALUE,
 814                                                         b1, src_len,
 815                                                         lzo_crc32, c_crc32);
 816                         }
 817
 818                         /* decompress */
 819 //                      if (option_mask32 & OPT_F)
 820 //                              r = lzo1x_decompress(b1, src_len, b2, &d, NULL);
 821 //                      else
 822                                 r = lzo1x_decompress_safe(b1, src_len, b2, &d, NULL);
 823
 824                         if (r != 0 /*LZO_E_OK*/ || dst_len != d) {
 825                                 bb_error_msg_and_die("corrupted data");
 826                         }
 827                         dst = b2;
 828                 } else {
 829                         /* "stored" block => no decompression */
 830                         dst = b1;
 831                 }
 832
 833                 if (!(option_mask32 & OPT_F)) {
 834                         /* verify checksum of uncompressed block */
 835                         if (h->flags & F_ADLER32_D)
 836                                 lzo_check(ADLER32_INIT_VALUE,
 837                                         dst, dst_len,
 838                                         lzo_adler32, d_adler32);
 839                         if (h->flags & F_CRC32_D)
 840                                 lzo_check(CRC32_INIT_VALUE,
 841                                         dst, dst_len,
 842                                         lzo_crc32, d_crc32);
 843                 }
 844
 845                 /* write uncompressed block data */
 846                 xwrite(1, dst, dst_len);
 847         }
 848
 849         free(b2);
 850         return ok;
 851 }
 852
 853 /**********************************************************************/
 854 // lzop file signature (shamelessly borrowed from PNG)
 855 /**********************************************************************/
 856 /*
 857  * The first nine bytes of a lzop file always contain the following values:
 858  *
 859  *                                 0   1   2   3   4   5   6   7   8
 860  *                               --- --- --- --- --- --- --- --- ---
 861  * (hex)                          89  4c  5a  4f  00  0d  0a  1a  0a
 862  * (decimal)                     137  76  90  79   0  13  10  26  10
 863  * (C notation - ASCII)         \211   L   Z   O  \0  \r  \n \032 \n
 864  */
 865
 866 /* (vda) comparison with lzop v1.02rc1 ("lzop -1 <FILE" cmd):
 867  * Only slight differences in header:
 868  * -00000000  89 4c 5a 4f 00 0d 0a 1a 0a 10 20 20 20 09 40 02
 869  * +00000000  89 4c 5a 4f 00 0d 0a 1a 0a 10 10 20 30 09 40 02
 870  *                                       ^^^^^ ^^^^^
 871  *                                     version lib_version
 872  * -00000010  01 03 00 00 0d 00 00 81 a4 49 f7 a6 3f 00 00 00
 873  * +00000010  01 03 00 00 01 00 00 00 00 00 00 00 00 00 00 00
 874  *               ^^^^^^^^^^^ ^^^^^^^^^^^ ^^^^^^^^^^^
 875  *               flags       mode        mtime
 876  * -00000020  00 00 2d 67 04 17 00 04 00 00 00 03 ed ec 9d 6d
 877  * +00000020  00 00 10 5f 00 c1 00 04 00 00 00 03 ed ec 9d 6d
 878  *                  ^^^^^^^^^^^
 879  *                  chksum_out
 880  * The rest is identical.
 881 */
 882 static const unsigned char lzop_magic[9] = {
 883         0x89, 0x4c, 0x5a, 0x4f, 0x00, 0x0d, 0x0a, 0x1a, 0x0a
 884 };
 885
 886 /* This coding is derived from Alexander Lehmann's pngcheck code. */
 887 static void check_magic(void)
 888 {
 889         unsigned char magic[sizeof(lzop_magic)];
 890         xread(0, magic, sizeof(magic));
 891         if (memcmp(magic, lzop_magic, sizeof(lzop_magic)) != 0)
 892                 bb_error_msg_and_die("bad magic number");
 893 }
 894
 895 /**********************************************************************/
 896 // lzop file header
 897 /**********************************************************************/
 898 static void write_header(const header_t *h)
 899 {
 900         int l;
 901
 902         xwrite(1, lzop_magic, sizeof(lzop_magic));
 903
 904         init_chksum(&G.chksum_out);
 905
 906         f_write16(h->version);
 907         f_write16(h->lib_version);
 908         f_write16(h->version_needed_to_extract);
 909         f_write8(h->method);
 910         f_write8(h->level);
 911         f_write32(h->flags);
 912         f_write32(h->mode);
 913         f_write32(h->mtime);
 914         f_write32(h->gmtdiff);
 915
 916         l = (int) strlen(h->name);
 917         f_write8(l);
 918         if (l)
 919                 f_write(h->name, l);
 920
 921         f_write32(chksum_getresult(&G.chksum_out, h));
 922 }
 923
 924 static int read_header(header_t *h)
 925 {
 926         int r;
 927         int l;
 928         uint32_t checksum;
 929
 930         memset(h, 0, sizeof(*h));
 931         h->version_needed_to_extract = 0x0900;  /* first lzop version */
 932         h->level = 0;
 933
 934         init_chksum(&G.chksum_in);
 935
 936         h->version = f_read16();
 937         if (h->version < 0x0900)
 938                 return 3;
 939         h->lib_version = f_read16();
 940         if (h->version >= 0x0940) {
 941                 h->version_needed_to_extract = f_read16();
 942                 if (h->version_needed_to_extract > LZOP_VERSION)
 943                         return 16;
 944                 if (h->version_needed_to_extract < 0x0900)
 945                         return 3;
 946         }
 947         h->method = f_read8();
 948         if (h->version >= 0x0940)
 949                 h->level = f_read8();
 950         h->flags = f_read32();
 951         if (h->flags & F_H_FILTER)
 952                 return 16; /* filter not supported */
 953         h->mode = f_read32();
 954         h->mtime = f_read32();
 955         if (h->version >= 0x0940)
 956                 h->gmtdiff = f_read32();
 957
 958         l = f_read8();
 959         if (l > 0)
 960                 f_read(h->name, l);
 961         h->name[l] = 0;
 962
 963         checksum = chksum_getresult(&G.chksum_in, h);
 964         h->header_checksum = f_read32();
 965         if (h->header_checksum != checksum)
 966                 return 2;
 967
 968         if (h->method <= 0)
 969                 return 14;
 970         r = lzo_get_method(h);
 971         if (r != 0)
 972                 return r;
 973
 974         /* check reserved flags */
 975         if (h->flags & F_RESERVED)
 976                 return -13;
 977
 978         /* skip extra field [not used yet] */
 979         if (h->flags & F_H_EXTRA_FIELD) {
 980                 uint32_t k;
 981
 982                 /* note: the checksum also covers the length */
 983                 init_chksum(&G.chksum_in);
 984                 h->extra_field_len = f_read32();
 985                 for (k = 0; k < h->extra_field_len; k++)
 986                         f_read8();
 987                 checksum = chksum_getresult(&G.chksum_in, h);
 988                 h->extra_field_checksum = f_read32();
 989                 if (h->extra_field_checksum != checksum)
 990                         return 3;
 991         }
 992
 993         return 0;
 994 }
 995
 996 static void p_header(header_t *h)
 997 {
 998         int r;
 999
1000         r = read_header(h);
1001         if (r == 0)
1002                 return;
1003         bb_error_msg_and_die("header_error %d", r);
1004 }
1005
1006 /**********************************************************************/
1007 // compress
1008 /**********************************************************************/
1009 static void lzo_set_method(header_t *h)
1010 {
1011         int level = 1;
1012
1013         if (option_mask32 & OPT_1) {
1014                 h->method = M_LZO1X_1_15;
1015         } else if (option_mask32 & OPT_789) {
1016 #if ENABLE_LZOP_COMPR_HIGH
1017                 h->method = M_LZO1X_999;
1018                 if (option_mask32 & OPT_7)
1019                         level = 7;
1020                 else if (option_mask32 & OPT_8)
1021                         level = 8;
1022                 else
1023                         level = 9;
1024 #else
1025                 bb_error_msg_and_die("high compression not compiled in");
1026 #endif
1027         } else { /* levels 2..6 or none (defaults to level 3) */
1028                 h->method = M_LZO1X_1;
1029                 level = 5; /* levels 2-6 are actually the same */
1030         }
1031
1032         h->level = level;
1033 }
1034
1035 static smallint do_lzo_compress(void)
1036 {
1037         header_t header;
1038
1039 #define h (&header)
1040         memset(h, 0, sizeof(*h));
1041
1042         lzo_set_method(h);
1043
1044         h->version = (LZOP_VERSION & 0xffff);
1045         h->version_needed_to_extract = 0x0940;
1046         h->lib_version = lzo_version() & 0xffff;
1047
1048         h->flags = (F_OS & F_OS_MASK) | (F_CS & F_CS_MASK);
1049
1050         if (!(option_mask32 & OPT_F) || h->method == M_LZO1X_999) {
1051                 h->flags |= F_ADLER32_D;
1052                 if (option_mask32 & OPT_C)
1053                         h->flags |= F_ADLER32_C;
1054         }
1055         write_header(h);
1056         return lzo_compress(h);
1057 #undef h
1058 }
1059
1060 /**********************************************************************/
1061 // decompress
1062 /**********************************************************************/
1063 static smallint do_lzo_decompress(void)
1064 {
1065         header_t header;
1066
1067         check_magic();
1068         p_header(&header);
1069         return lzo_decompress(&header);
1070 }
1071
1072 static char* FAST_FUNC make_new_name_lzop(char *filename, const char *expected_ext UNUSED_PARAM)
1073 {
1074         if (option_mask32 & OPT_DECOMPRESS) {
1075                 char *extension = strrchr(filename, '.');
1076                 if (!extension || strcmp(extension + 1, "lzo") != 0)
1077                         return xasprintf("%s.out", filename);
1078                 *extension = '\0';
1079                 return filename;
1080         }
1081         return xasprintf("%s.lzo", filename);
1082 }
1083
1084 static IF_DESKTOP(long long) int FAST_FUNC pack_lzop(transformer_aux_data_t *aux UNUSED_PARAM)
1085 {
1086         if (option_mask32 & OPT_DECOMPRESS)
1087                 return do_lzo_decompress();
1088         return do_lzo_compress();
1089 }
1090
1091 int lzop_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1092 int lzop_main(int argc UNUSED_PARAM, char **argv)
1093 {
1094         getopt32(argv, OPTION_STRING);
1095         argv += optind;
1096         /* lzopcat? */
1097         if (applet_name[4] == 'c')
1098                 option_mask32 |= (OPT_STDOUT | OPT_DECOMPRESS);
1099         /* unlzop? */
1100         if (applet_name[4] == 'o')
1101                 option_mask32 |= OPT_DECOMPRESS;
1102
1103         global_crc32_table = crc32_filltable(NULL, 0);
1104         return bbunpack(argv, pack_lzop, make_new_name_lzop, /*unused:*/ NULL);
1105 }