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