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++; *op++ = *m_pos++;
 215                                         goto copy_literal_run;
 216                                 }
 217  copy_m1:
 218                                 *op++ = *m_pos++;
 219                                 *op++ = *m_pos++;
 220                         } else {
 221  match:
 222                                 if (t >= 64) {                          /* a M2 match */
 223                                         m_pos = op - 1;
 224 #if defined(LZO1X)
 225                                         m_pos -= (t >> 2) & 7;
 226                                         m_pos -= *ip++ << 3;
 227                                         t = (t >> 5) - 1;
 228 #elif defined(LZO1Y)
 229                                         m_pos -= (t >> 2) & 3;
 230                                         m_pos -= *ip++ << 2;
 231                                         t = (t >> 4) - 3;
 232 #endif
 233                                         if (litp == NULL)
 234                                                 goto copy_m;
 235
 236                                         nl = ip[-2] & 3;
 237                                         /* test if in beetween two long literal runs */
 238                                         if (t == 1 && lit > 3 && nl == 0
 239                                          && ip[0] < 16 && ip[0] != 0 && (lit + 3 + ip[0] < 16)
 240                                         ) {
 241                                                 t = *ip++;
 242                                                 /* copy over the 3 literals that replace the match */
 243                                                 copy3(ip-1-2,m_pos,pd(op,m_pos));
 244                                                 /* set new length of previous literal run */
 245                                                 lit += 3 + t + 3;
 246                                                 *litp = (unsigned char)(lit - 3);
 247                                                 o_m2++;
 248                                                 *op++ = *m_pos++;
 249                                                 *op++ = *m_pos++;
 250                                                 *op++ = *m_pos++;
 251                                                 goto copy_literal_run;
 252                                         }
 253                                 } else {
 254                                         if (t >= 32) {                  /* a M3 match */
 255                                                 t &= 31;
 256                                                 if (t == 0) {
 257                                                         t = 31;
 258                                                         while (*ip == 0)
 259                                                                 t += 255, ip++;
 260                                                         t += *ip++;
 261                                                 }
 262                                                 m_pos = op - 1;
 263                                                 m_pos -= *ip++ >> 2;
 264                                                 m_pos -= *ip++ << 6;
 265                                         } else {                                        /* a M4 match */
 266                                                 m_pos = op;
 267                                                 m_pos -= (t & 8) << 11;
 268                                                 t &= 7;
 269                                                 if (t == 0) {
 270                                                         t = 7;
 271                                                         while (*ip == 0)
 272                                                                 t += 255, ip++;
 273                                                         t += *ip++;
 274                                                 }
 275                                                 m_pos -= *ip++ >> 2;
 276                                                 m_pos -= *ip++ << 6;
 277                                                 if (m_pos == op)
 278                                                         goto eof_found;
 279                                                 m_pos -= 0x4000;
 280                                         }
 281                                         if (litp == NULL)
 282                                                 goto copy_m;
 283
 284                                         nl = ip[-2] & 3;
 285                                         /* test if in beetween two matches */
 286                                         if (t == 1 && lit == 0 && nl == 0 && ip[0] >= 16) {
 287                                                 next_lit = nl;
 288                                                 /* make a previous short run */
 289                                                 lit += 3;
 290                                                 *litp = (unsigned char)((*litp & ~3) | lit);
 291                                                 /* copy over the 3 literals that replace the match */
 292                                                 copy3(ip-3,m_pos,pd(op,m_pos));
 293                                                 o_m3_a++;
 294                                         }
 295                                         /* test if a literal run follows */
 296                                         else if (t == 1 && lit <= 3 && nl == 0
 297                                          && ip[0] < 16 && ip[0] != 0 && (lit + 3 + ip[0] < 16)
 298                                         ) {
 299                                                 t = *ip++;
 300                                                 /* remove short run */
 301                                                 *litp &= ~3;
 302                                                 /* copy over the 3 literals that replace the match */
 303                                                 copy3(ip-4+1,m_pos,pd(op,m_pos));
 304                                                 /* move literals 1 byte ahead */
 305                                                 litp += 2;
 306                                                 if (lit > 0)
 307                                                         memmove(litp+1,litp,lit);
 308                                                 /* insert new length of long literal run */
 309                                                 lit += 3 + t + 3;
 310                                                 *litp = (unsigned char)(lit - 3);
 311
 312                                                 o_m3_b++;
 313                                                 *op++ = *m_pos++;
 314                                                 *op++ = *m_pos++;
 315                                                 *op++ = *m_pos++;
 316                                                 goto copy_literal_run;
 317                                         }
 318                                 }
 319  copy_m:
 320                                 *op++ = *m_pos++;
 321                                 *op++ = *m_pos++;
 322                                 do *op++ = *m_pos++; while (--t > 0);
 323                         }
 324
 325  match_done:
 326                         if (next_lit == NO_LIT) {
 327                                 t = ip[-2] & 3;
 328                                 lit = t;
 329                                 litp = ip - 2;
 330                         }
 331                         else
 332                                 t = next_lit;
 333                         next_lit = NO_LIT;
 334                         if (t == 0)
 335                                 break;
 336                         /* copy literals */
 337  match_next:
 338                         do *op++ = *ip++; while (--t > 0);
 339                         t = *ip++;
 340                 } while (TEST_IP && TEST_OP);
 341         }
 342
 343         /* no EOF code was found */
 344         *out_len = pd(op, out);
 345         return LZO_E_EOF_NOT_FOUND;
 346
 347  eof_found:
 348 //        LZO_UNUSED(o_m1_a); LZO_UNUSED(o_m1_b); LZO_UNUSED(o_m2);
 349 //        LZO_UNUSED(o_m3_a); LZO_UNUSED(o_m3_b);
 350         *out_len = pd(op, out);
 351         return (ip == ip_end ? LZO_E_OK :
 352                    (ip < ip_end  ? LZO_E_INPUT_NOT_CONSUMED : LZO_E_INPUT_OVERRUN));
 353 }
 354
 355 /**********************************************************************/
 356 #define F_OS F_OS_UNIX
 357 #define F_CS F_CS_NATIVE
 358
 359 /**********************************************************************/
 360 #define ADLER32_INIT_VALUE 1
 361 #define CRC32_INIT_VALUE   0
 362
 363 /**********************************************************************/
 364 enum {
 365         M_LZO1X_1    = 1,
 366         M_LZO1X_1_15 = 2,
 367         M_LZO1X_999  = 3,
 368 };
 369
 370 /**********************************************************************/
 371 /* header flags */
 372 #define F_ADLER32_D     0x00000001L
 373 #define F_ADLER32_C     0x00000002L
 374 #define F_H_EXTRA_FIELD 0x00000040L
 375 #define F_H_GMTDIFF     0x00000080L
 376 #define F_CRC32_D       0x00000100L
 377 #define F_CRC32_C       0x00000200L
 378 #define F_H_FILTER      0x00000800L
 379 #define F_H_CRC32       0x00001000L
 380 #define F_MASK          0x00003FFFL
 381
 382 /* operating system & file system that created the file [mostly unused] */
 383 #define F_OS_UNIX       0x03000000L
 384 #define F_OS_SHIFT      24
 385 #define F_OS_MASK       0xff000000L
 386
 387 /* character set for file name encoding [mostly unused] */
 388 #define F_CS_NATIVE     0x00000000L
 389 #define F_CS_SHIFT      20
 390 #define F_CS_MASK       0x00f00000L
 391
 392 /* these bits must be zero */
 393 #define F_RESERVED      ((F_MASK | F_OS_MASK | F_CS_MASK) ^ 0xffffffffL)
 394
 395 typedef struct chksum_t {
 396         uint32_t f_adler32;
 397         uint32_t f_crc32;
 398 } chksum_t;
 399
 400 typedef struct header_t {
 401         unsigned version;
 402         unsigned lib_version;
 403         unsigned version_needed_to_extract;
 404         uint32_t flags;
 405         uint32_t mode;
 406         uint32_t mtime;
 407         uint32_t gmtdiff;
 408         uint32_t header_checksum;
 409
 410         uint32_t extra_field_len;
 411         uint32_t extra_field_checksum;
 412
 413         unsigned char method;
 414         unsigned char level;
 415
 416         /* info */
 417         char name[255+1];
 418 } header_t;
 419
 420 struct globals {
 421         /*const uint32_t *lzo_crc32_table;*/
 422         chksum_t chksum_in;
 423         chksum_t chksum_out;
 424 } FIX_ALIASING;
 425 #define G (*(struct globals*)&bb_common_bufsiz1)
 426 #define INIT_G() do { } while (0)
 427 //#define G (*ptr_to_globals)
 428 //#define INIT_G() do {
 429 //      SET_PTR_TO_GLOBALS(xzalloc(sizeof(G)));
 430 //} while (0)
 431
 432
 433 /**********************************************************************/
 434 #define LZOP_VERSION            0x1010
 435 //#define LZOP_VERSION_STRING     "1.01"
 436 //#define LZOP_VERSION_DATE       "Apr 27th 2003"
 437
 438 #define OPTION_STRING "cfvdt123456789CF"
 439
 440 enum {
 441         OPT_STDOUT      = (1 << 0),
 442         OPT_FORCE       = (1 << 1),
 443         OPT_VERBOSE     = (1 << 2),
 444         OPT_DECOMPRESS  = (1 << 3),
 445         OPT_TEST        = (1 << 4),
 446         OPT_1           = (1 << 5),
 447         OPT_2           = (1 << 6),
 448         OPT_3           = (1 << 7),
 449         OPT_4           = (1 << 8),
 450         OPT_5           = (1 << 9),
 451         OPT_6           = (1 << 10),
 452         OPT_789         = (7 << 11),
 453         OPT_7           = (1 << 11),
 454         OPT_8           = (1 << 12),
 455         OPT_C           = (1 << 14),
 456         OPT_F           = (1 << 15),
 457 };
 458
 459 /**********************************************************************/
 460 // adler32 checksum
 461 // adapted from free code by Mark Adler <madler@alumni.caltech.edu>
 462 // see http://www.zlib.org/
 463 /**********************************************************************/
 464 static FAST_FUNC uint32_t
 465 lzo_adler32(uint32_t adler, const uint8_t* buf, unsigned len)
 466 {
 467         enum {
 468                 LZO_BASE = 65521, /* largest prime smaller than 65536 */
 469                 /* NMAX is the largest n such that
 470                  * 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
 471                 LZO_NMAX = 5552,
 472         };
 473         uint32_t s1 = adler & 0xffff;
 474         uint32_t s2 = (adler >> 16) & 0xffff;
 475         unsigned k;
 476
 477         if (buf == NULL)
 478                 return 1;
 479
 480         while (len > 0) {
 481                 k = len < LZO_NMAX ? (unsigned) len : LZO_NMAX;
 482                 len -= k;
 483                 if (k != 0) do {
 484                         s1 += *buf++;
 485                         s2 += s1;
 486                 } while (--k > 0);
 487                 s1 %= LZO_BASE;
 488                 s2 %= LZO_BASE;
 489         }
 490         return (s2 << 16) | s1;
 491 }
 492
 493 static FAST_FUNC uint32_t
 494 lzo_crc32(uint32_t c, const uint8_t* buf, unsigned len)
 495 {
 496         //if (buf == NULL) - impossible
 497         //      return 0;
 498
 499         return ~crc32_block_endian0(~c, buf, len, global_crc32_table);
 500 }
 501
 502 /**********************************************************************/
 503 static void init_chksum(chksum_t *ct)
 504 {
 505         ct->f_adler32 = ADLER32_INIT_VALUE;
 506         ct->f_crc32 = CRC32_INIT_VALUE;
 507 }
 508
 509 static void add_bytes_to_chksum(chksum_t *ct, const void* buf, int cnt)
 510 {
 511         /* We need to handle the two checksums at once, because at the
 512          * beginning of the header, we don't know yet which one we'll
 513          * eventually need */
 514         ct->f_adler32 = lzo_adler32(ct->f_adler32, (const uint8_t*)buf, cnt);
 515         ct->f_crc32 = lzo_crc32(ct->f_crc32, (const uint8_t*)buf, cnt);
 516 }
 517
 518 static uint32_t chksum_getresult(chksum_t *ct, const header_t *h)
 519 {
 520         return (h->flags & F_H_CRC32) ? ct->f_crc32 : ct->f_adler32;
 521 }
 522
 523 /**********************************************************************/
 524 static uint32_t read32(void)
 525 {
 526         uint32_t v;
 527         xread(0, &v, 4);
 528         return ntohl(v);
 529 }
 530
 531 static void write32(uint32_t v)
 532 {
 533         v = htonl(v);
 534         xwrite(1, &v, 4);
 535 }
 536
 537 static void f_write(const void* buf, int cnt)
 538 {
 539         xwrite(1, buf, cnt);
 540         add_bytes_to_chksum(&G.chksum_out, buf, cnt);
 541 }
 542
 543 static void f_read(void* buf, int cnt)
 544 {
 545         xread(0, buf, cnt);
 546         add_bytes_to_chksum(&G.chksum_in, buf, cnt);
 547 }
 548
 549 static int f_read8(void)
 550 {
 551         uint8_t v;
 552         f_read(&v, 1);
 553         return v;
 554 }
 555
 556 static void f_write8(uint8_t v)
 557 {
 558         f_write(&v, 1);
 559 }
 560
 561 static unsigned f_read16(void)
 562 {
 563         uint16_t v;
 564         f_read(&v, 2);
 565         return ntohs(v);
 566 }
 567
 568 static void f_write16(uint16_t v)
 569 {
 570         v = htons(v);
 571         f_write(&v, 2);
 572 }
 573
 574 static uint32_t f_read32(void)
 575 {
 576         uint32_t v;
 577         f_read(&v, 4);
 578         return ntohl(v);
 579 }
 580
 581 static void f_write32(uint32_t v)
 582 {
 583         v = htonl(v);
 584         f_write(&v, 4);
 585 }
 586
 587 /**********************************************************************/
 588 static int lzo_get_method(header_t *h)
 589 {
 590         /* check method */
 591         if (h->method == M_LZO1X_1) {
 592                 if (h->level == 0)
 593                         h->level = 3;
 594         } else if (h->method == M_LZO1X_1_15) {
 595                 if (h->level == 0)
 596                         h->level = 1;
 597         } else if (h->method == M_LZO1X_999) {
 598                 if (h->level == 0)
 599                         h->level = 9;
 600         } else
 601                 return -1;              /* not a LZO method */
 602
 603         /* check compression level */
 604         if (h->level < 1 || h->level > 9)
 605                 return 15;
 606
 607         return 0;
 608 }
 609
 610 /**********************************************************************/
 611 #define LZO_BLOCK_SIZE  (256 * 1024l)
 612 #define MAX_BLOCK_SIZE  (64 * 1024l * 1024l)    /* DO NOT CHANGE */
 613
 614 /* LZO may expand uncompressible data by a small amount */
 615 #define MAX_COMPRESSED_SIZE(x)  ((x) + (x) / 16 + 64 + 3)
 616
 617 /**********************************************************************/
 618 // compress a file
 619 /**********************************************************************/
 620 static NOINLINE smallint lzo_compress(const header_t *h)
 621 {
 622         unsigned block_size = LZO_BLOCK_SIZE;
 623         int r = 0; /* LZO_E_OK */
 624         uint8_t *const b1 = xzalloc(block_size);
 625         uint8_t *const b2 = xzalloc(MAX_COMPRESSED_SIZE(block_size));
 626         unsigned src_len = 0, dst_len = 0;
 627         uint32_t d_adler32 = ADLER32_INIT_VALUE;
 628         uint32_t d_crc32 = CRC32_INIT_VALUE;
 629         int l;
 630         smallint ok = 1;
 631         uint8_t *wrk_mem = NULL;
 632
 633         if (h->method == M_LZO1X_1)
 634                 wrk_mem = xzalloc(LZO1X_1_MEM_COMPRESS);
 635         else if (h->method == M_LZO1X_1_15)
 636                 wrk_mem = xzalloc(LZO1X_1_15_MEM_COMPRESS);
 637         else if (h->method == M_LZO1X_999)
 638                 wrk_mem = xzalloc(LZO1X_999_MEM_COMPRESS);
 639
 640         for (;;) {
 641                 /* read a block */
 642                 l = full_read(0, b1, block_size);
 643                 src_len = (l > 0 ? l : 0);
 644
 645                 /* write uncompressed block size */
 646                 write32(src_len);
 647
 648                 /* exit if last block */
 649                 if (src_len == 0)
 650                         break;
 651
 652                 /* compute checksum of uncompressed block */
 653                 if (h->flags & F_ADLER32_D)
 654                         d_adler32 = lzo_adler32(ADLER32_INIT_VALUE, b1, src_len);
 655                 if (h->flags & F_CRC32_D)
 656                         d_crc32 = lzo_crc32(CRC32_INIT_VALUE, b1, src_len);
 657
 658                 /* compress */
 659                 if (h->method == M_LZO1X_1)
 660                         r = lzo1x_1_compress(b1, src_len, b2, &dst_len, wrk_mem);
 661                 else if (h->method == M_LZO1X_1_15)
 662                         r = lzo1x_1_15_compress(b1, src_len, b2, &dst_len, wrk_mem);
 663 #if ENABLE_LZOP_COMPR_HIGH
 664                 else if (h->method == M_LZO1X_999)
 665                         r = lzo1x_999_compress_level(b1, src_len, b2, &dst_len,
 666                                                 wrk_mem, h->level);
 667 #endif
 668                 else
 669                         bb_error_msg_and_die("internal error");
 670
 671                 if (r != 0) /* not LZO_E_OK */
 672                         bb_error_msg_and_die("internal error - compression failed");
 673
 674                 /* write compressed block size */
 675                 if (dst_len < src_len) {
 676                         /* optimize */
 677                         if (h->method == M_LZO1X_999) {
 678                                 unsigned new_len = src_len;
 679                                 r = lzo1x_optimize(b2, dst_len, b1, &new_len, NULL);
 680                                 if (r != 0 /*LZO_E_OK*/ || new_len != src_len)
 681                                         bb_error_msg_and_die("internal error - optimization failed");
 682                         }
 683                         write32(dst_len);
 684                 } else {
 685                         /* data actually expanded => store data uncompressed */
 686                         write32(src_len);
 687                 }
 688
 689                 /* write checksum of uncompressed block */
 690                 if (h->flags & F_ADLER32_D)
 691                         write32(d_adler32);
 692                 if (h->flags & F_CRC32_D)
 693                         write32(d_crc32);
 694
 695                 if (dst_len < src_len) {
 696                         /* write checksum of compressed block */
 697                         if (h->flags & F_ADLER32_C)
 698                                 write32(lzo_adler32(ADLER32_INIT_VALUE, b2, dst_len));
 699                         if (h->flags & F_CRC32_C)
 700                                 write32(lzo_crc32(CRC32_INIT_VALUE, b2, dst_len));
 701                         /* write compressed block data */
 702                         xwrite(1, b2, dst_len);
 703                 } else {
 704                         /* write uncompressed block data */
 705                         xwrite(1, b1, src_len);
 706                 }
 707         }
 708
 709         free(wrk_mem);
 710         free(b1);
 711         free(b2);
 712         return ok;
 713 }
 714
 715 static FAST_FUNC void lzo_check(
 716                 uint32_t init,
 717                 uint8_t* buf, unsigned len,
 718                 uint32_t FAST_FUNC (*fn)(uint32_t, const uint8_t*, unsigned),
 719                 uint32_t ref)
 720 {
 721         /* This function, by having the same order of parameters
 722          * as fn, and by being marked FAST_FUNC (same as fn),
 723          * saves a dozen bytes of code.
 724          */
 725         uint32_t c = fn(init, buf, len);
 726         if (c != ref)
 727                 bb_error_msg_and_die("checksum error");
 728 }
 729
 730 /**********************************************************************/
 731 // decompress a file
 732 /**********************************************************************/
 733 static NOINLINE smallint lzo_decompress(const header_t *h)
 734 {
 735         unsigned block_size = LZO_BLOCK_SIZE;
 736         int r;
 737         uint32_t src_len, dst_len;
 738         uint32_t c_adler32 = ADLER32_INIT_VALUE;
 739         uint32_t d_adler32 = ADLER32_INIT_VALUE;
 740         uint32_t c_crc32 = CRC32_INIT_VALUE, d_crc32 = CRC32_INIT_VALUE;
 741         smallint ok = 1;
 742         uint8_t *b1;
 743         uint32_t mcs_block_size = MAX_COMPRESSED_SIZE(block_size);
 744         uint8_t *b2 = NULL;
 745
 746         for (;;) {
 747                 uint8_t *dst;
 748
 749                 /* read uncompressed block size */
 750                 dst_len = read32();
 751
 752                 /* exit if last block */
 753                 if (dst_len == 0)
 754                         break;
 755
 756                 /* error if split file */
 757                 if (dst_len == 0xffffffffL)
 758                         /* should not happen - not yet implemented */
 759                         bb_error_msg_and_die("this file is a split lzop file");
 760
 761                 if (dst_len > MAX_BLOCK_SIZE)
 762                         bb_error_msg_and_die("corrupted data");
 763
 764                 /* read compressed block size */
 765                 src_len = read32();
 766                 if (src_len <= 0 || src_len > dst_len)
 767                         bb_error_msg_and_die("corrupted data");
 768
 769                 if (dst_len > block_size) {
 770                         if (b2) {
 771                                 free(b2);
 772                                 b2 = NULL;
 773                         }
 774                         block_size = dst_len;
 775                         mcs_block_size = MAX_COMPRESSED_SIZE(block_size);
 776                 }
 777
 778                 /* read checksum of uncompressed block */
 779                 if (h->flags & F_ADLER32_D)
 780                         d_adler32 = read32();
 781                 if (h->flags & F_CRC32_D)
 782                         d_crc32 = read32();
 783
 784                 /* read checksum of compressed block */
 785                 if (src_len < dst_len) {
 786                         if (h->flags & F_ADLER32_C)
 787                                 c_adler32 = read32();
 788                         if (h->flags & F_CRC32_C)
 789                                 c_crc32 = read32();
 790                 }
 791
 792                 if (b2 == NULL)
 793                         b2 = xzalloc(mcs_block_size);
 794                 /* read the block into the end of our buffer */
 795                 b1 = b2 + mcs_block_size - src_len;
 796                 xread(0, b1, src_len);
 797
 798                 if (src_len < dst_len) {
 799                         unsigned d = dst_len;
 800
 801                         if (!(option_mask32 & OPT_F)) {
 802                                 /* verify checksum of compressed block */
 803                                 if (h->flags & F_ADLER32_C)
 804                                         lzo_check(ADLER32_INIT_VALUE,
 805                                                         b1, src_len,
 806                                                         lzo_adler32, c_adler32);
 807                                 if (h->flags & F_CRC32_C)
 808                                         lzo_check(CRC32_INIT_VALUE,
 809                                                         b1, src_len,
 810                                                         lzo_crc32, c_crc32);
 811                         }
 812
 813                         /* decompress */
 814 //                      if (option_mask32 & OPT_F)
 815 //                              r = lzo1x_decompress(b1, src_len, b2, &d, NULL);
 816 //                      else
 817                                 r = lzo1x_decompress_safe(b1, src_len, b2, &d, NULL);
 818
 819                         if (r != 0 /*LZO_E_OK*/ || dst_len != d) {
 820                                 bb_error_msg_and_die("corrupted data");
 821                         }
 822                         dst = b2;
 823                 } else {
 824                         /* "stored" block => no decompression */
 825                         dst = b1;
 826                 }
 827
 828                 if (!(option_mask32 & OPT_F)) {
 829                         /* verify checksum of uncompressed block */
 830                         if (h->flags & F_ADLER32_D)
 831                                 lzo_check(ADLER32_INIT_VALUE,
 832                                         dst, dst_len,
 833                                         lzo_adler32, d_adler32);
 834                         if (h->flags & F_CRC32_D)
 835                                 lzo_check(CRC32_INIT_VALUE,
 836                                         dst, dst_len,
 837                                         lzo_crc32, d_crc32);
 838                 }
 839
 840                 /* write uncompressed block data */
 841                 xwrite(1, dst, dst_len);
 842         }
 843
 844         free(b2);
 845         return ok;
 846 }
 847
 848 /**********************************************************************/
 849 // lzop file signature (shamelessly borrowed from PNG)
 850 /**********************************************************************/
 851 /*
 852  * The first nine bytes of a lzop file always contain the following values:
 853  *
 854  *                                 0   1   2   3   4   5   6   7   8
 855  *                               --- --- --- --- --- --- --- --- ---
 856  * (hex)                          89  4c  5a  4f  00  0d  0a  1a  0a
 857  * (decimal)                     137  76  90  79   0  13  10  26  10
 858  * (C notation - ASCII)         \211   L   Z   O  \0  \r  \n \032 \n
 859  */
 860
 861 /* (vda) comparison with lzop v1.02rc1 ("lzop -1 <FILE" cmd):
 862  * Only slight differences in header:
 863  * -00000000  89 4c 5a 4f 00 0d 0a 1a 0a 10 20 20 20 09 40 02
 864  * +00000000  89 4c 5a 4f 00 0d 0a 1a 0a 10 10 20 30 09 40 02
 865  *                                       ^^^^^ ^^^^^
 866  *                                     version lib_version
 867  * -00000010  01 03 00 00 0d 00 00 81 a4 49 f7 a6 3f 00 00 00
 868  * +00000010  01 03 00 00 01 00 00 00 00 00 00 00 00 00 00 00
 869  *               ^^^^^^^^^^^ ^^^^^^^^^^^ ^^^^^^^^^^^
 870  *               flags       mode        mtime
 871  * -00000020  00 00 2d 67 04 17 00 04 00 00 00 03 ed ec 9d 6d
 872  * +00000020  00 00 10 5f 00 c1 00 04 00 00 00 03 ed ec 9d 6d
 873  *                  ^^^^^^^^^^^
 874  *                  chksum_out
 875  * The rest is identical.
 876 */
 877 static const unsigned char lzop_magic[9] = {
 878         0x89, 0x4c, 0x5a, 0x4f, 0x00, 0x0d, 0x0a, 0x1a, 0x0a
 879 };
 880
 881 /* This coding is derived from Alexander Lehmann's pngcheck code. */
 882 static void check_magic(void)
 883 {
 884         unsigned char magic[sizeof(lzop_magic)];
 885         xread(0, magic, sizeof(magic));
 886         if (memcmp(magic, lzop_magic, sizeof(lzop_magic)) != 0)
 887                 bb_error_msg_and_die("bad magic number");
 888 }
 889
 890 /**********************************************************************/
 891 // lzop file header
 892 /**********************************************************************/
 893 static void write_header(const header_t *h)
 894 {
 895         int l;
 896
 897         xwrite(1, lzop_magic, sizeof(lzop_magic));
 898
 899         init_chksum(&G.chksum_out);
 900
 901         f_write16(h->version);
 902         f_write16(h->lib_version);
 903         f_write16(h->version_needed_to_extract);
 904         f_write8(h->method);
 905         f_write8(h->level);
 906         f_write32(h->flags);
 907         f_write32(h->mode);
 908         f_write32(h->mtime);
 909         f_write32(h->gmtdiff);
 910
 911         l = (int) strlen(h->name);
 912         f_write8(l);
 913         if (l)
 914                 f_write(h->name, l);
 915
 916         f_write32(chksum_getresult(&G.chksum_out, h));
 917 }
 918
 919 static int read_header(header_t *h)
 920 {
 921         int r;
 922         int l;
 923         uint32_t checksum;
 924
 925         memset(h, 0, sizeof(*h));
 926         h->version_needed_to_extract = 0x0900;  /* first lzop version */
 927         h->level = 0;
 928
 929         init_chksum(&G.chksum_in);
 930
 931         h->version = f_read16();
 932         if (h->version < 0x0900)
 933                 return 3;
 934         h->lib_version = f_read16();
 935         if (h->version >= 0x0940) {
 936                 h->version_needed_to_extract = f_read16();
 937                 if (h->version_needed_to_extract > LZOP_VERSION)
 938                         return 16;
 939                 if (h->version_needed_to_extract < 0x0900)
 940                         return 3;
 941         }
 942         h->method = f_read8();
 943         if (h->version >= 0x0940)
 944                 h->level = f_read8();
 945         h->flags = f_read32();
 946         if (h->flags & F_H_FILTER)
 947                 return 16; /* filter not supported */
 948         h->mode = f_read32();
 949         h->mtime = f_read32();
 950         if (h->version >= 0x0940)
 951                 h->gmtdiff = f_read32();
 952
 953         l = f_read8();
 954         if (l > 0)
 955                 f_read(h->name, l);
 956         h->name[l] = 0;
 957
 958         checksum = chksum_getresult(&G.chksum_in, h);
 959         h->header_checksum = f_read32();
 960         if (h->header_checksum != checksum)
 961                 return 2;
 962
 963         if (h->method <= 0)
 964                 return 14;
 965         r = lzo_get_method(h);
 966         if (r != 0)
 967                 return r;
 968
 969         /* check reserved flags */
 970         if (h->flags & F_RESERVED)
 971                 return -13;
 972
 973         /* skip extra field [not used yet] */
 974         if (h->flags & F_H_EXTRA_FIELD) {
 975                 uint32_t k;
 976
 977                 /* note: the checksum also covers the length */
 978                 init_chksum(&G.chksum_in);
 979                 h->extra_field_len = f_read32();
 980                 for (k = 0; k < h->extra_field_len; k++)
 981                         f_read8();
 982                 checksum = chksum_getresult(&G.chksum_in, h);
 983                 h->extra_field_checksum = f_read32();
 984                 if (h->extra_field_checksum != checksum)
 985                         return 3;
 986         }
 987
 988         return 0;
 989 }
 990
 991 static void p_header(header_t *h)
 992 {
 993         int r;
 994
 995         r = read_header(h);
 996         if (r == 0)
 997                 return;
 998         bb_error_msg_and_die("header_error %d", r);
 999 }
1000
1001 /**********************************************************************/
1002 // compress
1003 /**********************************************************************/
1004 static void lzo_set_method(header_t *h)
1005 {
1006         int level = 1;
1007
1008         if (option_mask32 & OPT_1) {
1009                 h->method = M_LZO1X_1_15;
1010         } else if (option_mask32 & OPT_789) {
1011 #if ENABLE_LZOP_COMPR_HIGH
1012                 h->method = M_LZO1X_999;
1013                 if (option_mask32 & OPT_7)
1014                         level = 7;
1015                 else if (option_mask32 & OPT_8)
1016                         level = 8;
1017                 else
1018                         level = 9;
1019 #else
1020                 bb_error_msg_and_die("high compression not compiled in");
1021 #endif
1022         } else { /* levels 2..6 or none (defaults to level 3) */
1023                 h->method = M_LZO1X_1;
1024                 level = 5; /* levels 2-6 are actually the same */
1025         }
1026
1027         h->level = level;
1028 }
1029
1030 static smallint do_lzo_compress(void)
1031 {
1032         header_t header;
1033
1034 #define h (&header)
1035         memset(h, 0, sizeof(*h));
1036
1037         lzo_set_method(h);
1038
1039         h->version = (LZOP_VERSION & 0xffff);
1040         h->version_needed_to_extract = 0x0940;
1041         h->lib_version = lzo_version() & 0xffff;
1042
1043         h->flags = (F_OS & F_OS_MASK) | (F_CS & F_CS_MASK);
1044
1045         if (!(option_mask32 & OPT_F) || h->method == M_LZO1X_999) {
1046                 h->flags |= F_ADLER32_D;
1047                 if (option_mask32 & OPT_C)
1048                         h->flags |= F_ADLER32_C;
1049         }
1050         write_header(h);
1051         return lzo_compress(h);
1052 #undef h
1053 }
1054
1055 /**********************************************************************/
1056 // decompress
1057 /**********************************************************************/
1058 static smallint do_lzo_decompress(void)
1059 {
1060         header_t header;
1061
1062         check_magic();
1063         p_header(&header);
1064         return lzo_decompress(&header);
1065 }
1066
1067 static char* FAST_FUNC make_new_name_lzop(char *filename, const char *expected_ext UNUSED_PARAM)
1068 {
1069         if (option_mask32 & OPT_DECOMPRESS) {
1070                 char *extension = strrchr(filename, '.');
1071                 if (!extension || strcmp(extension + 1, "lzo") != 0)
1072                         return xasprintf("%s.out", filename);
1073                 *extension = '\0';
1074                 return filename;
1075         }
1076         return xasprintf("%s.lzo", filename);
1077 }
1078
1079 static IF_DESKTOP(long long) int FAST_FUNC pack_lzop(unpack_info_t *info UNUSED_PARAM)
1080 {
1081         if (option_mask32 & OPT_DECOMPRESS)
1082                 return do_lzo_decompress();
1083         return do_lzo_compress();
1084 }
1085
1086 int lzop_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1087 int lzop_main(int argc UNUSED_PARAM, char **argv)
1088 {
1089         getopt32(argv, OPTION_STRING);
1090         argv += optind;
1091         /* lzopcat? */
1092         if (applet_name[4] == 'c')
1093                 option_mask32 |= (OPT_STDOUT | OPT_DECOMPRESS);
1094         /* unlzop? */
1095         if (applet_name[0] == 'u')
1096                 option_mask32 |= OPT_DECOMPRESS;
1097
1098         global_crc32_table = crc32_filltable(NULL, 0);
1099         return bbunpack(argv, pack_lzop, make_new_name_lzop, /*unused:*/ NULL);
1100 }