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
  13 /* Note: must be kept in sync with archival/lzop.c */
  14 enum {
  15         OPT_STDOUT     = 1 << 0,
  16         OPT_FORCE      = 1 << 1,
  17         /* only some decompressors: */
  18         OPT_VERBOSE    = 1 << 2,
  19         OPT_QUIET      = 1 << 3,
  20         OPT_DECOMPRESS = 1 << 4,
  21         OPT_TEST       = 1 << 5,
  22         SEAMLESS_MAGIC = (1 << 31) * SEAMLESS_COMPRESSION,
  23 };
  24
  25 static
  26 int open_to_or_warn(int to_fd, const char *filename, int flags, int mode)
  27 {
  28         int fd = open3_or_warn(filename, flags, mode);
  29         if (fd < 0) {
  30                 return 1;
  31         }
  32         xmove_fd(fd, to_fd);
  33         return 0;
  34 }
  35
  36 char* FAST_FUNC append_ext(char *filename, const char *expected_ext)
  37 {
  38         return xasprintf("%s.%s", filename, expected_ext);
  39 }
  40
  41 int FAST_FUNC bbunpack(char **argv,
  42         IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(transformer_aux_data_t *aux),
  43         char* FAST_FUNC (*make_new_name)(char *filename, const char *expected_ext),
  44         const char *expected_ext
  45 )
  46 {
  47         struct stat stat_buf;
  48         IF_DESKTOP(long long) int status = 0;
  49         char *filename, *new_name;
  50         smallint exitcode = 0;
  51         transformer_aux_data_t aux;
  52
  53         do {
  54                 /* NB: new_name is *maybe* malloc'ed! */
  55                 new_name = NULL;
  56                 filename = *argv; /* can be NULL - 'streaming' bunzip2 */
  57
  58                 if (filename && LONE_DASH(filename))
  59                         filename = NULL;
  60
  61                 /* Open src */
  62                 if (filename) {
  63                         if (!(option_mask32 & SEAMLESS_MAGIC)) {
  64                                 if (stat(filename, &stat_buf) != 0) {
  65  err_name:
  66                                         bb_simple_perror_msg(filename);
  67  err:
  68                                         exitcode = 1;
  69                                         goto free_name;
  70                                 }
  71                                 if (open_to_or_warn(STDIN_FILENO, filename, O_RDONLY, 0))
  72                                         goto err;
  73                         } else {
  74                                 /* "clever zcat" with FILE */
  75                                 /* fail_if_not_compressed because zcat refuses uncompressed input */
  76                                 int fd = open_zipped(filename, /*fail_if_not_compressed:*/ 1);
  77                                 if (fd < 0)
  78                                         goto err_name;
  79                                 xmove_fd(fd, STDIN_FILENO);
  80                         }
  81                 } else
  82                 if (option_mask32 & SEAMLESS_MAGIC) {
  83                         /* "clever zcat" on stdin */
  84                         if (setup_unzip_on_fd(STDIN_FILENO, /*fail_if_not_compressed*/ 1))
  85                                 goto err;
  86                 }
  87
  88                 /* Special cases: test, stdout */
  89                 if (option_mask32 & (OPT_STDOUT|OPT_TEST)) {
  90                         if (option_mask32 & OPT_TEST)
  91                                 if (open_to_or_warn(STDOUT_FILENO, bb_dev_null, O_WRONLY, 0))
  92                                         xfunc_die();
  93                         filename = NULL;
  94                 }
  95
  96                 /* Open dst if we are going to unpack to file */
  97                 if (filename) {
  98                         new_name = make_new_name(filename, expected_ext);
  99                         if (!new_name) {
 100                                 bb_error_msg("%s: unknown suffix - ignored", filename);
 101                                 goto err;
 102                         }
 103
 104                         /* -f: overwrite existing output files */
 105                         if (option_mask32 & OPT_FORCE) {
 106                                 unlink(new_name);
 107                         }
 108
 109                         /* O_EXCL: "real" bunzip2 doesn't overwrite files */
 110                         /* GNU gunzip does not bail out, but goes to next file */
 111                         if (open_to_or_warn(STDOUT_FILENO, new_name, O_WRONLY | O_CREAT | O_EXCL,
 112                                         stat_buf.st_mode))
 113                                 goto err;
 114                 }
 115
 116                 /* Check that the input is sane */
 117                 if (!(option_mask32 & OPT_FORCE) && isatty(STDIN_FILENO)) {
 118                         bb_error_msg_and_die("compressed data not read from terminal, "
 119                                         "use -f to force it");
 120                 }
 121
 122                 if (!(option_mask32 & SEAMLESS_MAGIC)) {
 123                         init_transformer_aux_data(&aux);
 124                         aux.check_signature = 1;
 125                         status = unpacker(&aux);
 126                         if (status < 0)
 127                                 exitcode = 1;
 128                 } else {
 129                         if (bb_copyfd_eof(STDIN_FILENO, STDOUT_FILENO) < 0)
 130                                 /* Disk full, tty closed, etc. No point in continuing */
 131                                 xfunc_die();
 132                 }
 133
 134                 if (!(option_mask32 & OPT_STDOUT))
 135                         xclose(STDOUT_FILENO); /* with error check! */
 136
 137                 if (filename) {
 138                         char *del = new_name;
 139
 140                         if (status >= 0) {
 141                                 unsigned new_name_len;
 142
 143                                 /* TODO: restore other things? */
 144                                 if (aux.mtime != 0) {
 145                                         struct timeval times[2];
 146
 147                                         times[1].tv_sec = times[0].tv_sec = aux.mtime;
 148                                         times[1].tv_usec = times[0].tv_usec = 0;
 149                                         /* Note: we closed it first.
 150                                          * On some systems calling utimes
 151                                          * then closing resets the mtime
 152                                          * back to current time. */
 153                                         utimes(new_name, times); /* ignoring errors */
 154                                 }
 155
 156                                 if (ENABLE_DESKTOP)
 157                                         new_name_len = strlen(new_name);
 158                                 /* Restore source filename (unless tgz -> tar case) */
 159                                 if (new_name == filename) {
 160                                         new_name_len = strlen(filename);
 161                                         filename[new_name_len] = '.';
 162                                 }
 163                                 /* Extreme bloat for gunzip compat */
 164                                 /* Some users do want this info... */
 165                                 if (ENABLE_DESKTOP && (option_mask32 & OPT_VERBOSE)) {
 166                                         unsigned percent = status
 167                                                 ? ((uoff_t)stat_buf.st_size * 100u / (unsigned long long)status)
 168                                                 : 0;
 169                                         fprintf(stderr, "%s: %u%% - replaced with %.*s\n",
 170                                                 filename,
 171                                                 100u - percent,
 172                                                 new_name_len, new_name
 173                                         );
 174                                 }
 175                                 /* Delete _source_ file */
 176                                 del = filename;
 177                         }
 178                         xunlink(del);
 179  free_name:
 180                         if (new_name != filename)
 181                                 free(new_name);
 182                 }
 183         } while (*argv && *++argv);
 184
 185         if (option_mask32 & OPT_STDOUT)
 186                 xclose(STDOUT_FILENO); /* with error check! */
 187
 188         return exitcode;
 189 }
 190
 191 #if ENABLE_UNCOMPRESS || ENABLE_BUNZIP2 || ENABLE_UNLZMA || ENABLE_UNXZ
 192 static
 193 char* FAST_FUNC make_new_name_generic(char *filename, const char *expected_ext)
 194 {
 195         char *extension = strrchr(filename, '.');
 196         if (!extension || strcmp(extension + 1, expected_ext) != 0) {
 197                 /* Mimic GNU gunzip - "real" bunzip2 tries to */
 198                 /* unpack file anyway, to file.out */
 199                 return NULL;
 200         }
 201         *extension = '\0';
 202         return filename;
 203 }
 204 #endif
 205
 206
 207 /*
 208  * Uncompress applet for busybox (c) 2002 Glenn McGrath
 209  *
 210  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 211  */
 212 //usage:#define uncompress_trivial_usage
 213 //usage:       "[-cf] [FILE]..."
 214 //usage:#define uncompress_full_usage "\n\n"
 215 //usage:       "Decompress .Z file[s]\n"
 216 //usage:     "\n        -c      Write to stdout"
 217 //usage:     "\n        -f      Overwrite"
 218
 219 //config:config UNCOMPRESS
 220 //config:       bool "uncompress"
 221 //config:       default n
 222 //config:       help
 223 //config:         uncompress is used to decompress archives created by compress.
 224 //config:         Not much used anymore, replaced by gzip/gunzip.
 225
 226 //applet:IF_UNCOMPRESS(APPLET(uncompress, BB_DIR_BIN, BB_SUID_DROP))
 227 //kbuild:lib-$(CONFIG_UNCOMPRESS) += bbunzip.o
 228 #if ENABLE_UNCOMPRESS
 229 static
 230 IF_DESKTOP(long long) int FAST_FUNC unpack_uncompress(transformer_aux_data_t *aux)
 231 {
 232         return unpack_Z_stream(aux, STDIN_FILENO, STDOUT_FILENO);
 233 }
 234 int uncompress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 235 int uncompress_main(int argc UNUSED_PARAM, char **argv)
 236 {
 237         getopt32(argv, "cf");
 238         argv += optind;
 239
 240         return bbunpack(argv, unpack_uncompress, make_new_name_generic, "Z");
 241 }
 242 #endif
 243
 244
 245 /*
 246  * Gzip implementation for busybox
 247  *
 248  * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
 249  *
 250  * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
 251  * based on gzip sources
 252  *
 253  * Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as
 254  * well as stdin/stdout, and to generally behave itself wrt command line
 255  * handling.
 256  *
 257  * General cleanup to better adhere to the style guide and make use of standard
 258  * busybox functions by Glenn McGrath
 259  *
 260  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 261  *
 262  * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
 263  * Copyright (C) 1992-1993 Jean-loup Gailly
 264  * The unzip code was written and put in the public domain by Mark Adler.
 265  * Portions of the lzw code are derived from the public domain 'compress'
 266  * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
 267  * Ken Turkowski, Dave Mack and Peter Jannesen.
 268  */
 269 //usage:#define gunzip_trivial_usage
 270 //usage:       "[-cft] [FILE]..."
 271 //usage:#define gunzip_full_usage "\n\n"
 272 //usage:       "Decompress FILEs (or stdin)\n"
 273 //usage:     "\n        -c      Write to stdout"
 274 //usage:     "\n        -f      Force"
 275 //usage:     "\n        -t      Test file integrity"
 276 //usage:
 277 //usage:#define gunzip_example_usage
 278 //usage:       "$ ls -la /tmp/BusyBox*\n"
 279 //usage:       "-rw-rw-r--    1 andersen andersen   557009 Apr 11 10:55 /tmp/BusyBox-0.43.tar.gz\n"
 280 //usage:       "$ gunzip /tmp/BusyBox-0.43.tar.gz\n"
 281 //usage:       "$ ls -la /tmp/BusyBox*\n"
 282 //usage:       "-rw-rw-r--    1 andersen andersen  1761280 Apr 14 17:47 /tmp/BusyBox-0.43.tar\n"
 283 //usage:
 284 //usage:#define zcat_trivial_usage
 285 //usage:       "[FILE]..."
 286 //usage:#define zcat_full_usage "\n\n"
 287 //usage:       "Decompress to stdout"
 288
 289 //config:config GUNZIP
 290 //config:       bool "gunzip"
 291 //config:       default y
 292 //config:       help
 293 //config:         gunzip is used to decompress archives created by gzip.
 294 //config:         You can use the `-t' option to test the integrity of
 295 //config:         an archive, without decompressing it.
 296
 297 //applet:IF_GUNZIP(APPLET(gunzip, BB_DIR_BIN, BB_SUID_DROP))
 298 //applet:IF_GUNZIP(APPLET_ODDNAME(zcat, gunzip, BB_DIR_BIN, BB_SUID_DROP, zcat))
 299 //kbuild:lib-$(CONFIG_GZIP) += bbunzip.o
 300 //kbuild:lib-$(CONFIG_GUNZIP) += bbunzip.o
 301 #if ENABLE_GUNZIP
 302 static
 303 char* FAST_FUNC make_new_name_gunzip(char *filename, const char *expected_ext UNUSED_PARAM)
 304 {
 305         char *extension = strrchr(filename, '.');
 306
 307         if (!extension)
 308                 return NULL;
 309
 310         extension++;
 311         if (strcmp(extension, "tgz" + 1) == 0
 312 #if ENABLE_FEATURE_SEAMLESS_Z
 313          || (extension[0] == 'Z' && extension[1] == '\0')
 314 #endif
 315         ) {
 316                 extension[-1] = '\0';
 317         } else if (strcmp(extension, "tgz") == 0) {
 318                 filename = xstrdup(filename);
 319                 extension = strrchr(filename, '.');
 320                 extension[2] = 'a';
 321                 extension[3] = 'r';
 322         } else {
 323                 return NULL;
 324         }
 325         return filename;
 326 }
 327 static
 328 IF_DESKTOP(long long) int FAST_FUNC unpack_gunzip(transformer_aux_data_t *aux)
 329 {
 330         return unpack_gz_stream(aux, STDIN_FILENO, STDOUT_FILENO);
 331 }
 332 /*
 333  * Linux kernel build uses gzip -d -n. We accept and ignore it.
 334  * Man page says:
 335  * -n --no-name
 336  * gzip: do not save the original file name and time stamp.
 337  * (The original name is always saved if the name had to be truncated.)
 338  * gunzip: do not restore the original file name/time even if present
 339  * (remove only the gzip suffix from the compressed file name).
 340  * This option is the default when decompressing.
 341  * -N --name
 342  * gzip: always save the original file name and time stamp (this is the default)
 343  * gunzip: restore the original file name and time stamp if present.
 344  */
 345 int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 346 int gunzip_main(int argc UNUSED_PARAM, char **argv)
 347 {
 348         getopt32(argv, "cfvqdtn");
 349         argv += optind;
 350
 351         /* If called as zcat...
 352          * Normally, "zcat" is just "gunzip -c".
 353          * But if seamless magic is enabled, then we are much more clever.
 354          */
 355         if (applet_name[1] == 'c')
 356                 option_mask32 |= OPT_STDOUT | SEAMLESS_MAGIC;
 357
 358         return bbunpack(argv, unpack_gunzip, make_new_name_gunzip, /*unused:*/ NULL);
 359 }
 360 #endif
 361
 362
 363 /*
 364  * Modified for busybox by Glenn McGrath
 365  * Added support output to stdout by Thomas Lundquist <thomasez@zelow.no>
 366  *
 367  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 368  */
 369 //usage:#define bunzip2_trivial_usage
 370 //usage:       "[-cf] [FILE]..."
 371 //usage:#define bunzip2_full_usage "\n\n"
 372 //usage:       "Decompress FILEs (or stdin)\n"
 373 //usage:     "\n        -c      Write to stdout"
 374 //usage:     "\n        -f      Force"
 375 //usage:#define bzcat_trivial_usage
 376 //usage:       "[FILE]..."
 377 //usage:#define bzcat_full_usage "\n\n"
 378 //usage:       "Decompress to stdout"
 379
 380 //config:config BUNZIP2
 381 //config:       bool "bunzip2"
 382 //config:       default y
 383 //config:       help
 384 //config:         bunzip2 is a compression utility using the Burrows-Wheeler block
 385 //config:         sorting text compression algorithm, and Huffman coding. Compression
 386 //config:         is generally considerably better than that achieved by more
 387 //config:         conventional LZ77/LZ78-based compressors, and approaches the
 388 //config:         performance of the PPM family of statistical compressors.
 389 //config:
 390 //config:         Unless you have a specific application which requires bunzip2, you
 391 //config:         should probably say N here.
 392
 393 //applet:IF_BUNZIP2(APPLET(bunzip2, BB_DIR_USR_BIN, BB_SUID_DROP))
 394 //applet:IF_BUNZIP2(APPLET_ODDNAME(bzcat, bunzip2, BB_DIR_USR_BIN, BB_SUID_DROP, bzcat))
 395 //kbuild:lib-$(CONFIG_BZIP2) += bbunzip.o
 396 //kbuild:lib-$(CONFIG_BUNZIP2) += bbunzip.o
 397 #if ENABLE_BUNZIP2
 398 static
 399 IF_DESKTOP(long long) int FAST_FUNC unpack_bunzip2(transformer_aux_data_t *aux)
 400 {
 401         return unpack_bz2_stream(aux, STDIN_FILENO, STDOUT_FILENO);
 402 }
 403 int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 404 int bunzip2_main(int argc UNUSED_PARAM, char **argv)
 405 {
 406         getopt32(argv, "cfvqdt");
 407         argv += optind;
 408         if (applet_name[2] == 'c') /* bzcat */
 409                 option_mask32 |= OPT_STDOUT;
 410
 411         return bbunpack(argv, unpack_bunzip2, make_new_name_generic, "bz2");
 412 }
 413 #endif
 414
 415
 416 /*
 417  * Small lzma deflate implementation.
 418  * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
 419  *
 420  * Based on bunzip.c from busybox
 421  *
 422  * Licensed under GPLv2, see file LICENSE in this source tree.
 423  */
 424 //usage:#define unlzma_trivial_usage
 425 //usage:       "[-cf] [FILE]..."
 426 //usage:#define unlzma_full_usage "\n\n"
 427 //usage:       "Decompress FILE (or stdin)\n"
 428 //usage:     "\n        -c      Write to stdout"
 429 //usage:     "\n        -f      Force"
 430 //usage:
 431 //usage:#define lzma_trivial_usage
 432 //usage:       "-d [-cf] [FILE]..."
 433 //usage:#define lzma_full_usage "\n\n"
 434 //usage:       "Decompress FILE (or stdin)\n"
 435 //usage:     "\n        -d      Decompress"
 436 //usage:     "\n        -c      Write to stdout"
 437 //usage:     "\n        -f      Force"
 438 //usage:
 439 //usage:#define lzcat_trivial_usage
 440 //usage:       "[FILE]..."
 441 //usage:#define lzcat_full_usage "\n\n"
 442 //usage:       "Decompress to stdout"
 443 //usage:
 444 //usage:#define unxz_trivial_usage
 445 //usage:       "[-cf] [FILE]..."
 446 //usage:#define unxz_full_usage "\n\n"
 447 //usage:       "Decompress FILE (or stdin)\n"
 448 //usage:     "\n        -c      Write to stdout"
 449 //usage:     "\n        -f      Force"
 450 //usage:
 451 //usage:#define xz_trivial_usage
 452 //usage:       "-d [-cf] [FILE]..."
 453 //usage:#define xz_full_usage "\n\n"
 454 //usage:       "Decompress FILE (or stdin)\n"
 455 //usage:     "\n        -d      Decompress"
 456 //usage:     "\n        -c      Write to stdout"
 457 //usage:     "\n        -f      Force"
 458 //usage:
 459 //usage:#define xzcat_trivial_usage
 460 //usage:       "[FILE]..."
 461 //usage:#define xzcat_full_usage "\n\n"
 462 //usage:       "Decompress to stdout"
 463
 464 //config:config UNLZMA
 465 //config:       bool "unlzma"
 466 //config:       default y
 467 //config:       help
 468 //config:         unlzma is a compression utility using the Lempel-Ziv-Markov chain
 469 //config:         compression algorithm, and range coding. Compression
 470 //config:         is generally considerably better than that achieved by the bzip2
 471 //config:         compressors.
 472 //config:
 473 //config:         The BusyBox unlzma applet is limited to decompression only.
 474 //config:         On an x86 system, this applet adds about 4K.
 475 //config:
 476 //config:config FEATURE_LZMA_FAST
 477 //config:       bool "Optimize unlzma for speed"
 478 //config:       default n
 479 //config:       depends on UNLZMA
 480 //config:       help
 481 //config:         This option reduces decompression time by about 25% at the cost of
 482 //config:         a 1K bigger binary.
 483 //config:
 484 //config:config LZMA
 485 //config:       bool "Provide lzma alias which supports only unpacking"
 486 //config:       default y
 487 //config:       depends on UNLZMA
 488 //config:       help
 489 //config:         Enable this option if you want commands like "lzma -d" to work.
 490 //config:         IOW: you'll get lzma applet, but it will always require -d option.
 491
 492 //applet:IF_UNLZMA(APPLET(unlzma, BB_DIR_USR_BIN, BB_SUID_DROP))
 493 //applet:IF_UNLZMA(APPLET_ODDNAME(lzcat, unlzma, BB_DIR_USR_BIN, BB_SUID_DROP, lzcat))
 494 //applet:IF_LZMA(APPLET_ODDNAME(lzma, unlzma, BB_DIR_USR_BIN, BB_SUID_DROP, lzma))
 495 //kbuild:lib-$(CONFIG_UNLZMA) += bbunzip.o
 496 #if ENABLE_UNLZMA
 497 static
 498 IF_DESKTOP(long long) int FAST_FUNC unpack_unlzma(transformer_aux_data_t *aux)
 499 {
 500         return unpack_lzma_stream(aux, STDIN_FILENO, STDOUT_FILENO);
 501 }
 502 int unlzma_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 503 int unlzma_main(int argc UNUSED_PARAM, char **argv)
 504 {
 505         IF_LZMA(int opts =) getopt32(argv, "cfvqdt");
 506 # if ENABLE_LZMA
 507         /* lzma without -d or -t? */
 508         if (applet_name[2] == 'm' && !(opts & (OPT_DECOMPRESS|OPT_TEST)))
 509                 bb_show_usage();
 510 # endif
 511         /* lzcat? */
 512         if (applet_name[2] == 'c')
 513                 option_mask32 |= OPT_STDOUT;
 514
 515         argv += optind;
 516         return bbunpack(argv, unpack_unlzma, make_new_name_generic, "lzma");
 517 }
 518 #endif
 519
 520
 521 //config:config UNXZ
 522 //config:       bool "unxz"
 523 //config:       default y
 524 //config:       help
 525 //config:         unxz is a unlzma successor.
 526 //config:
 527 //config:config XZ
 528 //config:       bool "Provide xz alias which supports only unpacking"
 529 //config:       default y
 530 //config:       depends on UNXZ
 531 //config:       help
 532 //config:         Enable this option if you want commands like "xz -d" to work.
 533 //config:         IOW: you'll get xz applet, but it will always require -d option.
 534
 535 //applet:IF_UNXZ(APPLET(unxz, BB_DIR_USR_BIN, BB_SUID_DROP))
 536 //applet:IF_UNXZ(APPLET_ODDNAME(xzcat, unxz, BB_DIR_USR_BIN, BB_SUID_DROP, xzcat))
 537 //applet:IF_XZ(APPLET_ODDNAME(xz, unxz, BB_DIR_USR_BIN, BB_SUID_DROP, xz))
 538 //kbuild:lib-$(CONFIG_UNXZ) += bbunzip.o
 539 #if ENABLE_UNXZ
 540 static
 541 IF_DESKTOP(long long) int FAST_FUNC unpack_unxz(transformer_aux_data_t *aux)
 542 {
 543         return unpack_xz_stream(aux, STDIN_FILENO, STDOUT_FILENO);
 544 }
 545 int unxz_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 546 int unxz_main(int argc UNUSED_PARAM, char **argv)
 547 {
 548         IF_XZ(int opts =) getopt32(argv, "cfvqdt");
 549 # if ENABLE_XZ
 550         /* xz without -d or -t? */
 551         if (applet_name[2] == '\0' && !(opts & (OPT_DECOMPRESS|OPT_TEST)))
 552                 bb_show_usage();
 553 # endif
 554         /* xzcat? */
 555         if (applet_name[2] == 'c')
 556                 option_mask32 |= OPT_STDOUT;
 557
 558         argv += optind;
 559         return bbunpack(argv, unpack_unxz, make_new_name_generic, "xz");
 560 }
 561 #endif