archival/bbunzip.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Common code for gunzip-like applets
   4  *
   5  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   6  */
   7 #include "libbb.h"
   8 #include "bb_archive.h"
   9
  10 /* lzop_main() uses bbunpack(), need this: */
  11 //kbuild:lib-$(CONFIG_LZOP) += bbunzip.o
  12 /* bzip2_main() too: */
  13 //kbuild:lib-$(CONFIG_BZIP2) += bbunzip.o
  14
  15 /* Note: must be kept in sync with archival/lzop.c */
  16 enum {
  17         OPT_STDOUT     = 1 << 0,
  18         OPT_FORCE      = 1 << 1,
  19         /* only some decompressors: */
  20         OPT_VERBOSE    = 1 << 2,
  21         OPT_QUIET      = 1 << 3,
  22         OPT_DECOMPRESS = 1 << 4,
  23         OPT_TEST       = 1 << 5,
  24         SEAMLESS_MAGIC = (1 << 31) * SEAMLESS_COMPRESSION,
  25 };
  26
  27 static
  28 int open_to_or_warn(int to_fd, const char *filename, int flags, int mode)
  29 {
  30         int fd = open3_or_warn(filename, flags, mode);
  31         if (fd < 0) {
  32                 return 1;
  33         }
  34         xmove_fd(fd, to_fd);
  35         return 0;
  36 }
  37
  38 char* FAST_FUNC append_ext(char *filename, const char *expected_ext)
  39 {
  40         return xasprintf("%s.%s", filename, expected_ext);
  41 }
  42
  43 int FAST_FUNC bbunpack(char **argv,
  44         IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(transformer_state_t *xstate),
  45         char* FAST_FUNC (*make_new_name)(char *filename, const char *expected_ext),
  46         const char *expected_ext
  47 )
  48 {
  49         struct stat stat_buf;
  50         IF_DESKTOP(long long) int status = 0;
  51         char *filename, *new_name;
  52         smallint exitcode = 0;
  53         transformer_state_t xstate;
  54
  55         do {
  56                 /* NB: new_name is *maybe* malloc'ed! */
  57                 new_name = NULL;
  58                 filename = *argv; /* can be NULL - 'streaming' bunzip2 */
  59
  60                 if (filename && LONE_DASH(filename))
  61                         filename = NULL;
  62
  63                 /* Open src */
  64                 if (filename) {
  65                         if (!(option_mask32 & SEAMLESS_MAGIC)) {
  66                                 if (stat(filename, &stat_buf) != 0) {
  67  err_name:
  68                                         bb_simple_perror_msg(filename);
  69  err:
  70                                         exitcode = 1;
  71                                         goto free_name;
  72                                 }
  73                                 if (open_to_or_warn(STDIN_FILENO, filename, O_RDONLY, 0))
  74                                         goto err;
  75                         } else {
  76                                 /* "clever zcat" with FILE */
  77                                 /* fail_if_not_compressed because zcat refuses uncompressed input */
  78                                 int fd = open_zipped(filename, /*fail_if_not_compressed:*/ 1);
  79                                 if (fd < 0)
  80                                         goto err_name;
  81                                 xmove_fd(fd, STDIN_FILENO);
  82                         }
  83                 } else
  84                 if (option_mask32 & SEAMLESS_MAGIC) {
  85                         /* "clever zcat" on stdin */
  86                         if (setup_unzip_on_fd(STDIN_FILENO, /*fail_if_not_compressed*/ 1))
  87                                 goto err;
  88                 }
  89
  90                 /* Special cases: test, stdout */
  91                 if (option_mask32 & (OPT_STDOUT|OPT_TEST)) {
  92                         if (option_mask32 & OPT_TEST)
  93                                 if (open_to_or_warn(STDOUT_FILENO, bb_dev_null, O_WRONLY, 0))
  94                                         xfunc_die();
  95                         filename = NULL;
  96                 }
  97
  98                 /* Open dst if we are going to unpack to file */
  99                 if (filename) {
 100                         new_name = make_new_name(filename, expected_ext);
 101                         if (!new_name) {
 102                                 bb_error_msg("%s: unknown suffix - ignored", filename);
 103                                 goto err;
 104                         }
 105
 106                         /* -f: overwrite existing output files */
 107                         if (option_mask32 & OPT_FORCE) {
 108                                 unlink(new_name);
 109                         }
 110
 111                         /* O_EXCL: "real" bunzip2 doesn't overwrite files */
 112                         /* GNU gunzip does not bail out, but goes to next file */
 113                         if (open_to_or_warn(STDOUT_FILENO, new_name, O_WRONLY | O_CREAT | O_EXCL,
 114                                         stat_buf.st_mode))
 115                                 goto err;
 116                 }
 117
 118                 /* Check that the input is sane */
 119                 if (!(option_mask32 & OPT_FORCE) && isatty(STDIN_FILENO)) {
 120                         bb_error_msg_and_die("compressed data not read from terminal, "
 121                                         "use -f to force it");
 122                 }
 123
 124                 if (!(option_mask32 & SEAMLESS_MAGIC)) {
 125                         init_transformer_state(&xstate);
 126                         xstate.signature_skipped = 0;
 127                         /*xstate.src_fd = STDIN_FILENO; - already is */
 128                         xstate.dst_fd = STDOUT_FILENO;
 129                         status = unpacker(&xstate);
 130                         if (status < 0)
 131                                 exitcode = 1;
 132                 } else {
 133                         if (bb_copyfd_eof(STDIN_FILENO, STDOUT_FILENO) < 0)
 134                                 /* Disk full, tty closed, etc. No point in continuing */
 135                                 xfunc_die();
 136                 }
 137
 138                 if (!(option_mask32 & OPT_STDOUT))
 139                         xclose(STDOUT_FILENO); /* with error check! */
 140
 141                 if (filename) {
 142                         char *del = new_name;
 143
 144                         if (status >= 0) {
 145                                 unsigned new_name_len;
 146
 147                                 /* TODO: restore other things? */
 148                                 if (xstate.mtime != 0) {
 149                                         struct timeval times[2];
 150
 151                                         times[1].tv_sec = times[0].tv_sec = xstate.mtime;
 152                                         times[1].tv_usec = times[0].tv_usec = 0;
 153                                         /* Note: we closed it first.
 154                                          * On some systems calling utimes
 155                                          * then closing resets the mtime
 156                                          * back to current time. */
 157                                         utimes(new_name, times); /* ignoring errors */
 158                                 }
 159
 160                                 if (ENABLE_DESKTOP)
 161                                         new_name_len = strlen(new_name);
 162                                 /* Restore source filename (unless tgz -> tar case) */
 163                                 if (new_name == filename) {
 164                                         new_name_len = strlen(filename);
 165                                         filename[new_name_len] = '.';
 166                                 }
 167                                 /* Extreme bloat for gunzip compat */
 168                                 /* Some users do want this info... */
 169                                 if (ENABLE_DESKTOP && (option_mask32 & OPT_VERBOSE)) {
 170                                         unsigned percent = status
 171                                                 ? ((uoff_t)stat_buf.st_size * 100u / (unsigned long long)status)
 172                                                 : 0;
 173                                         fprintf(stderr, "%s: %u%% - replaced with %.*s\n",
 174                                                 filename,
 175                                                 100u - percent,
 176                                                 new_name_len, new_name
 177                                         );
 178                                 }
 179                                 /* Delete _source_ file */
 180                                 del = filename;
 181                         }
 182                         xunlink(del);
 183  free_name:
 184                         if (new_name != filename)
 185                                 free(new_name);
 186                 }
 187         } while (*argv && *++argv);
 188
 189         if (option_mask32 & OPT_STDOUT)
 190                 xclose(STDOUT_FILENO); /* with error check! */
 191
 192         return exitcode;
 193 }
 194
 195 #if ENABLE_UNCOMPRESS \
 196  || ENABLE_BUNZIP2 || ENABLE_BZCAT \
 197  || ENABLE_UNLZMA || ENABLE_LZCAT || ENABLE_LZMA \
 198  || ENABLE_UNXZ || ENABLE_XZCAT || ENABLE_XZ
 199 static
 200 char* FAST_FUNC make_new_name_generic(char *filename, const char *expected_ext)
 201 {
 202         char *extension = strrchr(filename, '.');
 203         if (!extension || strcmp(extension + 1, expected_ext) != 0) {
 204                 /* Mimic GNU gunzip - "real" bunzip2 tries to */
 205                 /* unpack file anyway, to file.out */
 206                 return NULL;
 207         }
 208         *extension = '\0';
 209         return filename;
 210 }
 211 #endif
 212
 213
 214 /*
 215  * Uncompress applet for busybox (c) 2002 Glenn McGrath
 216  *
 217  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 218  */
 219 //usage:#define uncompress_trivial_usage
 220 //usage:       "[-cf] [FILE]..."
 221 //usage:#define uncompress_full_usage "\n\n"
 222 //usage:       "Decompress .Z file[s]\n"
 223 //usage:     "\n        -c      Write to stdout"
 224 //usage:     "\n        -f      Overwrite"
 225
 226 //config:config UNCOMPRESS
 227 //config:       bool "uncompress"
 228 //config:       default n  # ancient
 229 //config:       help
 230 //config:         uncompress is used to decompress archives created by compress.
 231 //config:         Not much used anymore, replaced by gzip/gunzip.
 232
 233 //applet:IF_UNCOMPRESS(APPLET(uncompress, BB_DIR_BIN, BB_SUID_DROP))
 234 //kbuild:lib-$(CONFIG_UNCOMPRESS) += bbunzip.o
 235 #if ENABLE_UNCOMPRESS
 236 int uncompress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 237 int uncompress_main(int argc UNUSED_PARAM, char **argv)
 238 {
 239         getopt32(argv, "cf");
 240         argv += optind;
 241
 242         return bbunpack(argv, unpack_Z_stream, make_new_name_generic, "Z");
 243 }
 244 #endif
 245
 246
 247 /*
 248  * Gzip implementation for busybox
 249  *
 250  * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
 251  *
 252  * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
 253  * based on gzip sources
 254  *
 255  * Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as
 256  * well as stdin/stdout, and to generally behave itself wrt command line
 257  * handling.
 258  *
 259  * General cleanup to better adhere to the style guide and make use of standard
 260  * busybox functions by Glenn McGrath
 261  *
 262  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 263  *
 264  * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
 265  * Copyright (C) 1992-1993 Jean-loup Gailly
 266  * The unzip code was written and put in the public domain by Mark Adler.
 267  * Portions of the lzw code are derived from the public domain 'compress'
 268  * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
 269  * Ken Turkowski, Dave Mack and Peter Jannesen.
 270  */
 271 //usage:#define gunzip_trivial_usage
 272 //usage:       "[-cft] [FILE]..."
 273 //usage:#define gunzip_full_usage "\n\n"
 274 //usage:       "Decompress FILEs (or stdin)\n"
 275 //usage:     "\n        -c      Write to stdout"
 276 //usage:     "\n        -f      Force"
 277 //usage:     "\n        -t      Test file integrity"
 278 //usage:
 279 //usage:#define gunzip_example_usage
 280 //usage:       "$ ls -la /tmp/BusyBox*\n"
 281 //usage:       "-rw-rw-r--    1 andersen andersen   557009 Apr 11 10:55 /tmp/BusyBox-0.43.tar.gz\n"
 282 //usage:       "$ gunzip /tmp/BusyBox-0.43.tar.gz\n"
 283 //usage:       "$ ls -la /tmp/BusyBox*\n"
 284 //usage:       "-rw-rw-r--    1 andersen andersen  1761280 Apr 14 17:47 /tmp/BusyBox-0.43.tar\n"
 285 //usage:
 286 //usage:#define zcat_trivial_usage
 287 //usage:       "[FILE]..."
 288 //usage:#define zcat_full_usage "\n\n"
 289 //usage:       "Decompress to stdout"
 290
 291 //config:config GUNZIP
 292 //config:       bool "gunzip"
 293 //config:       default y
 294 //config:       help
 295 //config:         gunzip is used to decompress archives created by gzip.
 296 //config:         You can use the `-t' option to test the integrity of
 297 //config:         an archive, without decompressing it.
 298 //config:
 299 //config:config ZCAT
 300 //config:       bool "zcat"
 301 //config:       default y
 302 //config:       help
 303 //config:         Alias to "gunzip -c".
 304 //config:
 305 //config:config FEATURE_GUNZIP_LONG_OPTIONS
 306 //config:       bool "Enable long options"
 307 //config:       default y
 308 //config:       depends on (GUNZIP || ZCAT) && LONG_OPTS
 309 //config:       help
 310 //config:         Enable use of long options.
 311
 312 //applet:IF_GUNZIP(APPLET(gunzip, BB_DIR_BIN, BB_SUID_DROP))
 313 //applet:IF_ZCAT(APPLET_ODDNAME(zcat, gunzip, BB_DIR_BIN, BB_SUID_DROP, zcat))
 314 //kbuild:lib-$(CONFIG_GUNZIP) += bbunzip.o
 315 //kbuild:lib-$(CONFIG_ZCAT) += bbunzip.o
 316 #if ENABLE_GUNZIP || ENABLE_ZCAT
 317 static
 318 char* FAST_FUNC make_new_name_gunzip(char *filename, const char *expected_ext UNUSED_PARAM)
 319 {
 320         char *extension = strrchr(filename, '.');
 321
 322         if (!extension)
 323                 return NULL;
 324
 325         extension++;
 326         if (strcmp(extension, "tgz" + 1) == 0
 327 #if ENABLE_FEATURE_SEAMLESS_Z
 328          || (extension[0] == 'Z' && extension[1] == '\0')
 329 #endif
 330         ) {
 331                 extension[-1] = '\0';
 332         } else if (strcmp(extension, "tgz") == 0) {
 333                 filename = xstrdup(filename);
 334                 extension = strrchr(filename, '.');
 335                 extension[2] = 'a';
 336                 extension[3] = 'r';
 337         } else {
 338                 return NULL;
 339         }
 340         return filename;
 341 }
 342
 343 #if ENABLE_FEATURE_GUNZIP_LONG_OPTIONS
 344 static const char gunzip_longopts[] ALIGN1 =
 345         "stdout\0"              No_argument       "c"
 346         "to-stdout\0"           No_argument       "c"
 347         "force\0"               No_argument       "f"
 348         "test\0"                No_argument       "t"
 349         "no-name\0"             No_argument       "n"
 350         ;
 351 #endif
 352
 353 /*
 354  * Linux kernel build uses gzip -d -n. We accept and ignore it.
 355  * Man page says:
 356  * -n --no-name
 357  * gzip: do not save the original file name and time stamp.
 358  * (The original name is always saved if the name had to be truncated.)
 359  * gunzip: do not restore the original file name/time even if present
 360  * (remove only the gzip suffix from the compressed file name).
 361  * This option is the default when decompressing.
 362  * -N --name
 363  * gzip: always save the original file name and time stamp (this is the default)
 364  * gunzip: restore the original file name and time stamp if present.
 365  */
 366 int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 367 int gunzip_main(int argc UNUSED_PARAM, char **argv)
 368 {
 369 #if ENABLE_FEATURE_GUNZIP_LONG_OPTIONS
 370         applet_long_options = gunzip_longopts;
 371 #endif
 372         getopt32(argv, "cfvqdtn");
 373         argv += optind;
 374
 375         /* If called as zcat...
 376          * Normally, "zcat" is just "gunzip -c".
 377          * But if seamless magic is enabled, then we are much more clever.
 378          */
 379         if (ENABLE_ZCAT && applet_name[1] == 'c')
 380                 option_mask32 |= OPT_STDOUT | SEAMLESS_MAGIC;
 381
 382         return bbunpack(argv, unpack_gz_stream, make_new_name_gunzip, /*unused:*/ NULL);
 383 }
 384 #endif
 385
 386
 387 /*
 388  * Modified for busybox by Glenn McGrath
 389  * Added support output to stdout by Thomas Lundquist <thomasez@zelow.no>
 390  *
 391  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 392  */
 393 //usage:#define bunzip2_trivial_usage
 394 //usage:       "[-cf] [FILE]..."
 395 //usage:#define bunzip2_full_usage "\n\n"
 396 //usage:       "Decompress FILEs (or stdin)\n"
 397 //usage:     "\n        -c      Write to stdout"
 398 //usage:     "\n        -f      Force"
 399 //usage:#define bzcat_trivial_usage
 400 //usage:       "[FILE]..."
 401 //usage:#define bzcat_full_usage "\n\n"
 402 //usage:       "Decompress to stdout"
 403
 404 //config:config BUNZIP2
 405 //config:       bool "bunzip2"
 406 //config:       default y
 407 //config:       help
 408 //config:         bunzip2 is a compression utility using the Burrows-Wheeler block
 409 //config:         sorting text compression algorithm, and Huffman coding. Compression
 410 //config:         is generally considerably better than that achieved by more
 411 //config:         conventional LZ77/LZ78-based compressors, and approaches the
 412 //config:         performance of the PPM family of statistical compressors.
 413 //config:
 414 //config:         Unless you have a specific application which requires bunzip2, you
 415 //config:         should probably say N here.
 416 //config:
 417 //config:config BZCAT
 418 //config:       bool "bzcat"
 419 //config:       default y
 420 //config:       help
 421 //config:         Alias to "bunzip2 -c".
 422
 423 //applet:IF_BUNZIP2(APPLET(bunzip2, BB_DIR_USR_BIN, BB_SUID_DROP))
 424 //applet:IF_BZCAT(APPLET_ODDNAME(bzcat, bunzip2, BB_DIR_USR_BIN, BB_SUID_DROP, bzcat))
 425 //kbuild:lib-$(CONFIG_BUNZIP2) += bbunzip.o
 426 //kbuild:lib-$(CONFIG_BZCAT) += bbunzip.o
 427 #if ENABLE_BUNZIP2 || ENABLE_BZCAT
 428 int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 429 int bunzip2_main(int argc UNUSED_PARAM, char **argv)
 430 {
 431         getopt32(argv, "cfvqdt");
 432         argv += optind;
 433         if (ENABLE_BZCAT && applet_name[2] == 'c') /* bzcat */
 434                 option_mask32 |= OPT_STDOUT;
 435
 436         return bbunpack(argv, unpack_bz2_stream, make_new_name_generic, "bz2");
 437 }
 438 #endif
 439
 440
 441 /*
 442  * Small lzma deflate implementation.
 443  * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
 444  *
 445  * Based on bunzip.c from busybox
 446  *
 447  * Licensed under GPLv2, see file LICENSE in this source tree.
 448  */
 449 //usage:#define unlzma_trivial_usage
 450 //usage:       "[-cf] [FILE]..."
 451 //usage:#define unlzma_full_usage "\n\n"
 452 //usage:       "Decompress FILE (or stdin)\n"
 453 //usage:     "\n        -c      Write to stdout"
 454 //usage:     "\n        -f      Force"
 455 //usage:
 456 //usage:#define lzma_trivial_usage
 457 //usage:       "-d [-cf] [FILE]..."
 458 //usage:#define lzma_full_usage "\n\n"
 459 //usage:       "Decompress FILE (or stdin)\n"
 460 //usage:     "\n        -d      Decompress"
 461 //usage:     "\n        -c      Write to stdout"
 462 //usage:     "\n        -f      Force"
 463 //usage:
 464 //usage:#define lzcat_trivial_usage
 465 //usage:       "[FILE]..."
 466 //usage:#define lzcat_full_usage "\n\n"
 467 //usage:       "Decompress to stdout"
 468 //usage:
 469 //usage:#define unxz_trivial_usage
 470 //usage:       "[-cf] [FILE]..."
 471 //usage:#define unxz_full_usage "\n\n"
 472 //usage:       "Decompress FILE (or stdin)\n"
 473 //usage:     "\n        -c      Write to stdout"
 474 //usage:     "\n        -f      Force"
 475 //usage:
 476 //usage:#define xz_trivial_usage
 477 //usage:       "-d [-cf] [FILE]..."
 478 //usage:#define xz_full_usage "\n\n"
 479 //usage:       "Decompress FILE (or stdin)\n"
 480 //usage:     "\n        -d      Decompress"
 481 //usage:     "\n        -c      Write to stdout"
 482 //usage:     "\n        -f      Force"
 483 //usage:
 484 //usage:#define xzcat_trivial_usage
 485 //usage:       "[FILE]..."
 486 //usage:#define xzcat_full_usage "\n\n"
 487 //usage:       "Decompress to stdout"
 488
 489 //config:config UNLZMA
 490 //config:       bool "unlzma"
 491 //config:       default y
 492 //config:       help
 493 //config:         unlzma is a compression utility using the Lempel-Ziv-Markov chain
 494 //config:         compression algorithm, and range coding. Compression
 495 //config:         is generally considerably better than that achieved by the bzip2
 496 //config:         compressors.
 497 //config:
 498 //config:         The BusyBox unlzma applet is limited to decompression only.
 499 //config:         On an x86 system, this applet adds about 4K.
 500 //config:
 501 //config:config LZCAT
 502 //config:       bool "lzcat"
 503 //config:       default y
 504 //config:       help
 505 //config:         unlzma is a compression utility using the Lempel-Ziv-Markov chain
 506 //config:         compression algorithm, and range coding. Compression
 507 //config:         is generally considerably better than that achieved by the bzip2
 508 //config:         compressors.
 509 //config:
 510 //config:         The BusyBox unlzma applet is limited to decompression only.
 511 //config:         On an x86 system, this applet adds about 4K.
 512 //config:
 513 //config:config LZMA
 514 //config:       bool "lzma -d"
 515 //config:       default y
 516 //config:       help
 517 //config:         Enable this option if you want commands like "lzma -d" to work.
 518 //config:         IOW: you'll get lzma applet, but it will always require -d option.
 519 //config:
 520 //config:config FEATURE_LZMA_FAST
 521 //config:       bool "Optimize unlzma for speed"
 522 //config:       default n
 523 //config:       depends on UNLZMA || LZCAT || LZMA
 524 //config:       help
 525 //config:         This option reduces decompression time by about 25% at the cost of
 526 //config:         a 1K bigger binary.
 527
 528 //applet:IF_UNLZMA(APPLET(unlzma, BB_DIR_USR_BIN, BB_SUID_DROP))
 529 //applet:IF_LZCAT(APPLET_ODDNAME(lzcat, unlzma, BB_DIR_USR_BIN, BB_SUID_DROP, lzcat))
 530 //applet:IF_LZMA(APPLET_ODDNAME(lzma, unlzma, BB_DIR_USR_BIN, BB_SUID_DROP, lzma))
 531 //kbuild:lib-$(CONFIG_UNLZMA) += bbunzip.o
 532 //kbuild:lib-$(CONFIG_LZCAT) += bbunzip.o
 533 //kbuild:lib-$(CONFIG_LZMA) += bbunzip.o
 534 #if ENABLE_UNLZMA || ENABLE_LZCAT || ENABLE_LZMA
 535 int unlzma_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 536 int unlzma_main(int argc UNUSED_PARAM, char **argv)
 537 {
 538         IF_LZMA(int opts =) getopt32(argv, "cfvqdt");
 539 # if ENABLE_LZMA
 540         /* lzma without -d or -t? */
 541         if (applet_name[2] == 'm' && !(opts & (OPT_DECOMPRESS|OPT_TEST)))
 542                 bb_show_usage();
 543 # endif
 544         /* lzcat? */
 545         if (ENABLE_LZCAT && applet_name[2] == 'c')
 546                 option_mask32 |= OPT_STDOUT;
 547
 548         argv += optind;
 549         return bbunpack(argv, unpack_lzma_stream, make_new_name_generic, "lzma");
 550 }
 551 #endif
 552
 553
 554 //config:config UNXZ
 555 //config:       bool "unxz"
 556 //config:       default y
 557 //config:       help
 558 //config:         unxz is a unlzma successor.
 559 //config:
 560 //config:config XZCAT
 561 //config:       bool "xzcat"
 562 //config:       default y
 563 //config:       help
 564 //config:         Alias to "unxz -c".
 565 //config:
 566 //config:config XZ
 567 //config:       bool "xz -d"
 568 //config:       default y
 569 //config:       help
 570 //config:         Enable this option if you want commands like "xz -d" to work.
 571 //config:         IOW: you'll get xz applet, but it will always require -d option.
 572
 573 //applet:IF_UNXZ(APPLET(unxz, BB_DIR_USR_BIN, BB_SUID_DROP))
 574 //applet:IF_XZCAT(APPLET_ODDNAME(xzcat, unxz, BB_DIR_USR_BIN, BB_SUID_DROP, xzcat))
 575 //applet:IF_XZ(APPLET_ODDNAME(xz, unxz, BB_DIR_USR_BIN, BB_SUID_DROP, xz))
 576 //kbuild:lib-$(CONFIG_UNXZ) += bbunzip.o
 577 //kbuild:lib-$(CONFIG_XZCAT) += bbunzip.o
 578 //kbuild:lib-$(CONFIG_XZ) += bbunzip.o
 579 #if ENABLE_UNXZ || ENABLE_XZCAT || ENABLE_XZ
 580 int unxz_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 581 int unxz_main(int argc UNUSED_PARAM, char **argv)
 582 {
 583         IF_XZ(int opts =) getopt32(argv, "cfvqdt");
 584 # if ENABLE_XZ
 585         /* xz without -d or -t? */
 586         if (applet_name[2] == '\0' && !(opts & (OPT_DECOMPRESS|OPT_TEST)))
 587                 bb_show_usage();
 588 # endif
 589         /* xzcat? */
 590         if (ENABLE_XZCAT && applet_name[2] == 'c')
 591                 option_mask32 |= OPT_STDOUT;
 592
 593         argv += optind;
 594         return bbunpack(argv, unpack_xz_stream, make_new_name_generic, "xz");
 595 }
 596 #endif