1 /* $NetBSD: gzip.c,v 1.97 2009/10/11 09:17:21 mrg Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 */ 29 30 #include <sys/cdefs.h> 31 #ifndef lint 32 __COPYRIGHT("@(#) Copyright (c) 1997, 1998, 2003, 2004, 2006\ 33 Matthew R. Green. All rights reserved."); 34 __RCSID("$FreeBSD$"); 35 #endif /* not lint */ 36 37 /* 38 * gzip.c -- GPL free gzip using zlib. 39 * 40 * RFC 1950 covers the zlib format 41 * RFC 1951 covers the deflate format 42 * RFC 1952 covers the gzip format 43 * 44 * TODO: 45 * - use mmap where possible 46 * - handle some signals better (remove outfile?) 47 * - make bzip2/compress -v/-t/-l support work as well as possible 48 */ 49 50 #include <sys/param.h> 51 #include <sys/stat.h> 52 #include <sys/time.h> 53 54 #include <inttypes.h> 55 #include <unistd.h> 56 #include <stdio.h> 57 #include <string.h> 58 #include <stdlib.h> 59 #include <err.h> 60 #include <errno.h> 61 #include <fcntl.h> 62 #include <zlib.h> 63 #include <fts.h> 64 #include <libgen.h> 65 #include <stdarg.h> 66 #include <getopt.h> 67 #include <time.h> 68 69 #ifndef PRIdOFF 70 #define PRIdOFF PRId64 71 #endif 72 73 /* what type of file are we dealing with */ 74 enum filetype { 75 FT_GZIP, 76 #ifndef NO_BZIP2_SUPPORT 77 FT_BZIP2, 78 #endif 79 #ifndef NO_COMPRESS_SUPPORT 80 FT_Z, 81 #endif 82 #ifndef NO_PACK_SUPPORT 83 FT_PACK, 84 #endif 85 FT_LAST, 86 FT_UNKNOWN 87 }; 88 89 #ifndef NO_BZIP2_SUPPORT 90 #include <bzlib.h> 91 92 #define BZ2_SUFFIX ".bz2" 93 #define BZIP2_MAGIC "\102\132\150" 94 #endif 95 96 #ifndef NO_COMPRESS_SUPPORT 97 #define Z_SUFFIX ".Z" 98 #define Z_MAGIC "\037\235" 99 #endif 100 101 #ifndef NO_PACK_SUPPORT 102 #define PACK_MAGIC "\037\036" 103 #endif 104 105 #define GZ_SUFFIX ".gz" 106 107 #define BUFLEN (64 * 1024) 108 109 #define GZIP_MAGIC0 0x1F 110 #define GZIP_MAGIC1 0x8B 111 #define GZIP_OMAGIC1 0x9E 112 113 #define GZIP_TIMESTAMP (off_t)4 114 #define GZIP_ORIGNAME (off_t)10 115 116 #define HEAD_CRC 0x02 117 #define EXTRA_FIELD 0x04 118 #define ORIG_NAME 0x08 119 #define COMMENT 0x10 120 121 #define OS_CODE 3 /* Unix */ 122 123 typedef struct { 124 const char *zipped; 125 int ziplen; 126 const char *normal; /* for unzip - must not be longer than zipped */ 127 } suffixes_t; 128 static suffixes_t suffixes[] = { 129 #define SUFFIX(Z, N) {Z, sizeof Z - 1, N} 130 SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S .xxx */ 131 #ifndef SMALL 132 SUFFIX(GZ_SUFFIX, ""), 133 SUFFIX(".z", ""), 134 SUFFIX("-gz", ""), 135 SUFFIX("-z", ""), 136 SUFFIX("_z", ""), 137 SUFFIX(".taz", ".tar"), 138 SUFFIX(".tgz", ".tar"), 139 #ifndef NO_BZIP2_SUPPORT 140 SUFFIX(BZ2_SUFFIX, ""), 141 SUFFIX(".tbz", ".tar"), 142 SUFFIX(".tbz2", ".tar"), 143 #endif 144 #ifndef NO_COMPRESS_SUPPORT 145 SUFFIX(Z_SUFFIX, ""), 146 #endif 147 SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S "" */ 148 #endif /* SMALL */ 149 #undef SUFFIX 150 }; 151 #define NUM_SUFFIXES (sizeof suffixes / sizeof suffixes[0]) 152 #define SUFFIX_MAXLEN 30 153 154 static const char gzip_version[] = "FreeBSD gzip 20100407"; 155 156 #ifndef SMALL 157 static const char gzip_copyright[] = \ 158 " Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green\n" 159 " All rights reserved.\n" 160 "\n" 161 " Redistribution and use in source and binary forms, with or without\n" 162 " modification, are permitted provided that the following conditions\n" 163 " are met:\n" 164 " 1. Redistributions of source code must retain the above copyright\n" 165 " notice, this list of conditions and the following disclaimer.\n" 166 " 2. Redistributions in binary form must reproduce the above copyright\n" 167 " notice, this list of conditions and the following disclaimer in the\n" 168 " documentation and/or other materials provided with the distribution.\n" 169 "\n" 170 " THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n" 171 " IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n" 172 " OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n" 173 " IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n" 174 " INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,\n" 175 " BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n" 176 " LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED\n" 177 " AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,\n" 178 " OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\n" 179 " OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\n" 180 " SUCH DAMAGE."; 181 #endif 182 183 static int cflag; /* stdout mode */ 184 static int dflag; /* decompress mode */ 185 static int lflag; /* list mode */ 186 static int numflag = 6; /* gzip -1..-9 value */ 187 188 #ifndef SMALL 189 static int fflag; /* force mode */ 190 static int kflag; /* don't delete input files */ 191 static int nflag; /* don't save name/timestamp */ 192 static int Nflag; /* don't restore name/timestamp */ 193 static int qflag; /* quiet mode */ 194 static int rflag; /* recursive mode */ 195 static int tflag; /* test */ 196 static int vflag; /* verbose mode */ 197 #else 198 #define qflag 0 199 #define tflag 0 200 #endif 201 202 static int exit_value = 0; /* exit value */ 203 204 static char *infile; /* name of file coming in */ 205 206 static void maybe_err(const char *fmt, ...) __dead2 207 __attribute__((__format__(__printf__, 1, 2))); 208 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) 209 static void maybe_errx(const char *fmt, ...) __dead2 210 __attribute__((__format__(__printf__, 1, 2))); 211 #endif 212 static void maybe_warn(const char *fmt, ...) 213 __attribute__((__format__(__printf__, 1, 2))); 214 static void maybe_warnx(const char *fmt, ...) 215 __attribute__((__format__(__printf__, 1, 2))); 216 static enum filetype file_gettype(u_char *); 217 #ifdef SMALL 218 #define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz) 219 #endif 220 static off_t gz_compress(int, int, off_t *, const char *, uint32_t); 221 static off_t gz_uncompress(int, int, char *, size_t, off_t *, const char *); 222 static off_t file_compress(char *, char *, size_t); 223 static off_t file_uncompress(char *, char *, size_t); 224 static void handle_pathname(char *); 225 static void handle_file(char *, struct stat *); 226 static void handle_stdin(void); 227 static void handle_stdout(void); 228 static void print_ratio(off_t, off_t, FILE *); 229 static void print_list(int fd, off_t, const char *, time_t); 230 static void usage(void); 231 static void display_version(void); 232 #ifndef SMALL 233 static void display_license(void); 234 #endif 235 static const suffixes_t *check_suffix(char *, int); 236 static ssize_t read_retry(int, void *, size_t); 237 238 #ifdef SMALL 239 #define unlink_input(f, sb) unlink(f) 240 #else 241 static off_t cat_fd(unsigned char *, size_t, off_t *, int fd); 242 static void prepend_gzip(char *, int *, char ***); 243 static void handle_dir(char *); 244 static void print_verbage(const char *, const char *, off_t, off_t); 245 static void print_test(const char *, int); 246 static void copymodes(int fd, const struct stat *, const char *file); 247 static int check_outfile(const char *outfile); 248 #endif 249 250 #ifndef NO_BZIP2_SUPPORT 251 static off_t unbzip2(int, int, char *, size_t, off_t *); 252 #endif 253 254 #ifndef NO_COMPRESS_SUPPORT 255 static FILE *zdopen(int); 256 static off_t zuncompress(FILE *, FILE *, char *, size_t, off_t *); 257 #endif 258 259 #ifndef NO_PACK_SUPPORT 260 static off_t unpack(int, int, char *, size_t, off_t *); 261 #endif 262 263 int main(int, char **p); 264 265 #ifdef SMALL 266 #define getopt_long(a,b,c,d,e) getopt(a,b,c) 267 #else 268 static const struct option longopts[] = { 269 { "stdout", no_argument, 0, 'c' }, 270 { "to-stdout", no_argument, 0, 'c' }, 271 { "decompress", no_argument, 0, 'd' }, 272 { "uncompress", no_argument, 0, 'd' }, 273 { "force", no_argument, 0, 'f' }, 274 { "help", no_argument, 0, 'h' }, 275 { "keep", no_argument, 0, 'k' }, 276 { "list", no_argument, 0, 'l' }, 277 { "no-name", no_argument, 0, 'n' }, 278 { "name", no_argument, 0, 'N' }, 279 { "quiet", no_argument, 0, 'q' }, 280 { "recursive", no_argument, 0, 'r' }, 281 { "suffix", required_argument, 0, 'S' }, 282 { "test", no_argument, 0, 't' }, 283 { "verbose", no_argument, 0, 'v' }, 284 { "version", no_argument, 0, 'V' }, 285 { "fast", no_argument, 0, '1' }, 286 { "best", no_argument, 0, '9' }, 287 { "ascii", no_argument, 0, 'a' }, 288 { "license", no_argument, 0, 'L' }, 289 { NULL, no_argument, 0, 0 }, 290 }; 291 #endif 292 293 int 294 main(int argc, char **argv) 295 { 296 const char *progname = getprogname(); 297 #ifndef SMALL 298 char *gzip; 299 int len; 300 #endif 301 int ch; 302 303 /* XXX set up signals */ 304 305 #ifndef SMALL 306 if ((gzip = getenv("GZIP")) != NULL) 307 prepend_gzip(gzip, &argc, &argv); 308 #endif 309 310 /* 311 * XXX 312 * handle being called `gunzip', `zcat' and `gzcat' 313 */ 314 if (strcmp(progname, "gunzip") == 0) 315 dflag = 1; 316 else if (strcmp(progname, "zcat") == 0 || 317 strcmp(progname, "gzcat") == 0) 318 dflag = cflag = 1; 319 320 #ifdef SMALL 321 #define OPT_LIST "123456789cdhltV" 322 #else 323 #define OPT_LIST "123456789acdfhklLNnqrS:tVv" 324 #endif 325 326 while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) { 327 switch (ch) { 328 case '1': case '2': case '3': 329 case '4': case '5': case '6': 330 case '7': case '8': case '9': 331 numflag = ch - '0'; 332 break; 333 case 'c': 334 cflag = 1; 335 break; 336 case 'd': 337 dflag = 1; 338 break; 339 case 'l': 340 lflag = 1; 341 dflag = 1; 342 break; 343 case 'V': 344 display_version(); 345 /* NOTREACHED */ 346 #ifndef SMALL 347 case 'a': 348 fprintf(stderr, "%s: option --ascii ignored on this system\n", progname); 349 break; 350 case 'f': 351 fflag = 1; 352 break; 353 case 'k': 354 kflag = 1; 355 break; 356 case 'L': 357 display_license(); 358 /* NOT REACHED */ 359 case 'N': 360 nflag = 0; 361 Nflag = 1; 362 break; 363 case 'n': 364 nflag = 1; 365 Nflag = 0; 366 break; 367 case 'q': 368 qflag = 1; 369 break; 370 case 'r': 371 rflag = 1; 372 break; 373 case 'S': 374 len = strlen(optarg); 375 if (len != 0) { 376 if (len > SUFFIX_MAXLEN) 377 errx(1, "incorrect suffix: '%s': too long", optarg); 378 suffixes[0].zipped = optarg; 379 suffixes[0].ziplen = len; 380 } else { 381 suffixes[NUM_SUFFIXES - 1].zipped = ""; 382 suffixes[NUM_SUFFIXES - 1].ziplen = 0; 383 } 384 break; 385 case 't': 386 cflag = 1; 387 tflag = 1; 388 dflag = 1; 389 break; 390 case 'v': 391 vflag = 1; 392 break; 393 #endif 394 default: 395 usage(); 396 /* NOTREACHED */ 397 } 398 } 399 argv += optind; 400 argc -= optind; 401 402 if (argc == 0) { 403 if (dflag) /* stdin mode */ 404 handle_stdin(); 405 else /* stdout mode */ 406 handle_stdout(); 407 } else { 408 do { 409 handle_pathname(argv[0]); 410 } while (*++argv); 411 } 412 #ifndef SMALL 413 if (qflag == 0 && lflag && argc > 1) 414 print_list(-1, 0, "(totals)", 0); 415 #endif 416 exit(exit_value); 417 } 418 419 /* maybe print a warning */ 420 void 421 maybe_warn(const char *fmt, ...) 422 { 423 va_list ap; 424 425 if (qflag == 0) { 426 va_start(ap, fmt); 427 vwarn(fmt, ap); 428 va_end(ap); 429 } 430 if (exit_value == 0) 431 exit_value = 1; 432 } 433 434 /* ... without an errno. */ 435 void 436 maybe_warnx(const char *fmt, ...) 437 { 438 va_list ap; 439 440 if (qflag == 0) { 441 va_start(ap, fmt); 442 vwarnx(fmt, ap); 443 va_end(ap); 444 } 445 if (exit_value == 0) 446 exit_value = 1; 447 } 448 449 /* maybe print an error */ 450 void 451 maybe_err(const char *fmt, ...) 452 { 453 va_list ap; 454 455 if (qflag == 0) { 456 va_start(ap, fmt); 457 vwarn(fmt, ap); 458 va_end(ap); 459 } 460 exit(2); 461 } 462 463 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) 464 /* ... without an errno. */ 465 void 466 maybe_errx(const char *fmt, ...) 467 { 468 va_list ap; 469 470 if (qflag == 0) { 471 va_start(ap, fmt); 472 vwarnx(fmt, ap); 473 va_end(ap); 474 } 475 exit(2); 476 } 477 #endif 478 479 #ifndef SMALL 480 /* split up $GZIP and prepend it to the argument list */ 481 static void 482 prepend_gzip(char *gzip, int *argc, char ***argv) 483 { 484 char *s, **nargv, **ac; 485 int nenvarg = 0, i; 486 487 /* scan how many arguments there are */ 488 for (s = gzip;;) { 489 while (*s == ' ' || *s == '\t') 490 s++; 491 if (*s == 0) 492 goto count_done; 493 nenvarg++; 494 while (*s != ' ' && *s != '\t') 495 if (*s++ == 0) 496 goto count_done; 497 } 498 count_done: 499 /* punt early */ 500 if (nenvarg == 0) 501 return; 502 503 *argc += nenvarg; 504 ac = *argv; 505 506 nargv = (char **)malloc((*argc + 1) * sizeof(char *)); 507 if (nargv == NULL) 508 maybe_err("malloc"); 509 510 /* stash this away */ 511 *argv = nargv; 512 513 /* copy the program name first */ 514 i = 0; 515 nargv[i++] = *(ac++); 516 517 /* take a copy of $GZIP and add it to the array */ 518 s = strdup(gzip); 519 if (s == NULL) 520 maybe_err("strdup"); 521 for (;;) { 522 /* Skip whitespaces. */ 523 while (*s == ' ' || *s == '\t') 524 s++; 525 if (*s == 0) 526 goto copy_done; 527 nargv[i++] = s; 528 /* Find the end of this argument. */ 529 while (*s != ' ' && *s != '\t') 530 if (*s++ == 0) 531 /* Argument followed by NUL. */ 532 goto copy_done; 533 /* Terminate by overwriting ' ' or '\t' with NUL. */ 534 *s++ = 0; 535 } 536 copy_done: 537 538 /* copy the original arguments and a NULL */ 539 while (*ac) 540 nargv[i++] = *(ac++); 541 nargv[i] = NULL; 542 } 543 #endif 544 545 /* compress input to output. Return bytes read, -1 on error */ 546 static off_t 547 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime) 548 { 549 z_stream z; 550 char *outbufp, *inbufp; 551 off_t in_tot = 0, out_tot = 0; 552 ssize_t in_size; 553 int i, error; 554 uLong crc; 555 #ifdef SMALL 556 static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0, 557 0, 0, 0, 0, 558 0, OS_CODE }; 559 #endif 560 561 outbufp = malloc(BUFLEN); 562 inbufp = malloc(BUFLEN); 563 if (outbufp == NULL || inbufp == NULL) { 564 maybe_err("malloc failed"); 565 goto out; 566 } 567 568 memset(&z, 0, sizeof z); 569 z.zalloc = Z_NULL; 570 z.zfree = Z_NULL; 571 z.opaque = 0; 572 573 #ifdef SMALL 574 memcpy(outbufp, header, sizeof header); 575 i = sizeof header; 576 #else 577 if (nflag != 0) { 578 mtime = 0; 579 origname = ""; 580 } 581 582 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s", 583 GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 584 *origname ? ORIG_NAME : 0, 585 mtime & 0xff, 586 (mtime >> 8) & 0xff, 587 (mtime >> 16) & 0xff, 588 (mtime >> 24) & 0xff, 589 numflag == 1 ? 4 : numflag == 9 ? 2 : 0, 590 OS_CODE, origname); 591 if (i >= BUFLEN) 592 /* this need PATH_MAX > BUFLEN ... */ 593 maybe_err("snprintf"); 594 if (*origname) 595 i++; 596 #endif 597 598 z.next_out = (unsigned char *)outbufp + i; 599 z.avail_out = BUFLEN - i; 600 601 error = deflateInit2(&z, numflag, Z_DEFLATED, 602 (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY); 603 if (error != Z_OK) { 604 maybe_warnx("deflateInit2 failed"); 605 in_tot = -1; 606 goto out; 607 } 608 609 crc = crc32(0L, Z_NULL, 0); 610 for (;;) { 611 if (z.avail_out == 0) { 612 if (write(out, outbufp, BUFLEN) != BUFLEN) { 613 maybe_warn("write"); 614 out_tot = -1; 615 goto out; 616 } 617 618 out_tot += BUFLEN; 619 z.next_out = (unsigned char *)outbufp; 620 z.avail_out = BUFLEN; 621 } 622 623 if (z.avail_in == 0) { 624 in_size = read(in, inbufp, BUFLEN); 625 if (in_size < 0) { 626 maybe_warn("read"); 627 in_tot = -1; 628 goto out; 629 } 630 if (in_size == 0) 631 break; 632 633 crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size); 634 in_tot += in_size; 635 z.next_in = (unsigned char *)inbufp; 636 z.avail_in = in_size; 637 } 638 639 error = deflate(&z, Z_NO_FLUSH); 640 if (error != Z_OK && error != Z_STREAM_END) { 641 maybe_warnx("deflate failed"); 642 in_tot = -1; 643 goto out; 644 } 645 } 646 647 /* clean up */ 648 for (;;) { 649 size_t len; 650 ssize_t w; 651 652 error = deflate(&z, Z_FINISH); 653 if (error != Z_OK && error != Z_STREAM_END) { 654 maybe_warnx("deflate failed"); 655 in_tot = -1; 656 goto out; 657 } 658 659 len = (char *)z.next_out - outbufp; 660 661 w = write(out, outbufp, len); 662 if (w == -1 || (size_t)w != len) { 663 maybe_warn("write"); 664 out_tot = -1; 665 goto out; 666 } 667 out_tot += len; 668 z.next_out = (unsigned char *)outbufp; 669 z.avail_out = BUFLEN; 670 671 if (error == Z_STREAM_END) 672 break; 673 } 674 675 if (deflateEnd(&z) != Z_OK) { 676 maybe_warnx("deflateEnd failed"); 677 in_tot = -1; 678 goto out; 679 } 680 681 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c", 682 (int)crc & 0xff, 683 (int)(crc >> 8) & 0xff, 684 (int)(crc >> 16) & 0xff, 685 (int)(crc >> 24) & 0xff, 686 (int)in_tot & 0xff, 687 (int)(in_tot >> 8) & 0xff, 688 (int)(in_tot >> 16) & 0xff, 689 (int)(in_tot >> 24) & 0xff); 690 if (i != 8) 691 maybe_err("snprintf"); 692 if (write(out, outbufp, i) != i) { 693 maybe_warn("write"); 694 in_tot = -1; 695 } else 696 out_tot += i; 697 698 out: 699 if (inbufp != NULL) 700 free(inbufp); 701 if (outbufp != NULL) 702 free(outbufp); 703 if (gsizep) 704 *gsizep = out_tot; 705 return in_tot; 706 } 707 708 /* 709 * uncompress input to output then close the input. return the 710 * uncompressed size written, and put the compressed sized read 711 * into `*gsizep'. 712 */ 713 static off_t 714 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep, 715 const char *filename) 716 { 717 z_stream z; 718 char *outbufp, *inbufp; 719 off_t out_tot = -1, in_tot = 0; 720 uint32_t out_sub_tot = 0; 721 enum { 722 GZSTATE_MAGIC0, 723 GZSTATE_MAGIC1, 724 GZSTATE_METHOD, 725 GZSTATE_FLAGS, 726 GZSTATE_SKIPPING, 727 GZSTATE_EXTRA, 728 GZSTATE_EXTRA2, 729 GZSTATE_EXTRA3, 730 GZSTATE_ORIGNAME, 731 GZSTATE_COMMENT, 732 GZSTATE_HEAD_CRC1, 733 GZSTATE_HEAD_CRC2, 734 GZSTATE_INIT, 735 GZSTATE_READ, 736 GZSTATE_CRC, 737 GZSTATE_LEN, 738 } state = GZSTATE_MAGIC0; 739 int flags = 0, skip_count = 0; 740 int error = Z_STREAM_ERROR, done_reading = 0; 741 uLong crc = 0; 742 ssize_t wr; 743 int needmore = 0; 744 745 #define ADVANCE() { z.next_in++; z.avail_in--; } 746 747 if ((outbufp = malloc(BUFLEN)) == NULL) { 748 maybe_err("malloc failed"); 749 goto out2; 750 } 751 if ((inbufp = malloc(BUFLEN)) == NULL) { 752 maybe_err("malloc failed"); 753 goto out1; 754 } 755 756 memset(&z, 0, sizeof z); 757 z.avail_in = prelen; 758 z.next_in = (unsigned char *)pre; 759 z.avail_out = BUFLEN; 760 z.next_out = (unsigned char *)outbufp; 761 z.zalloc = NULL; 762 z.zfree = NULL; 763 z.opaque = 0; 764 765 in_tot = prelen; 766 out_tot = 0; 767 768 for (;;) { 769 if ((z.avail_in == 0 || needmore) && done_reading == 0) { 770 ssize_t in_size; 771 772 if (z.avail_in > 0) { 773 memmove(inbufp, z.next_in, z.avail_in); 774 } 775 z.next_in = (unsigned char *)inbufp; 776 in_size = read(in, z.next_in + z.avail_in, 777 BUFLEN - z.avail_in); 778 779 if (in_size == -1) { 780 maybe_warn("failed to read stdin"); 781 goto stop_and_fail; 782 } else if (in_size == 0) { 783 done_reading = 1; 784 } 785 786 z.avail_in += in_size; 787 needmore = 0; 788 789 in_tot += in_size; 790 } 791 if (z.avail_in == 0) { 792 if (done_reading && state != GZSTATE_MAGIC0) { 793 maybe_warnx("%s: unexpected end of file", 794 filename); 795 goto stop_and_fail; 796 } 797 goto stop; 798 } 799 switch (state) { 800 case GZSTATE_MAGIC0: 801 if (*z.next_in != GZIP_MAGIC0) { 802 if (in_tot > 0) { 803 maybe_warnx("%s: trailing garbage " 804 "ignored", filename); 805 goto stop; 806 } 807 maybe_warnx("input not gziped (MAGIC0)"); 808 goto stop_and_fail; 809 } 810 ADVANCE(); 811 state++; 812 out_sub_tot = 0; 813 crc = crc32(0L, Z_NULL, 0); 814 break; 815 816 case GZSTATE_MAGIC1: 817 if (*z.next_in != GZIP_MAGIC1 && 818 *z.next_in != GZIP_OMAGIC1) { 819 maybe_warnx("input not gziped (MAGIC1)"); 820 goto stop_and_fail; 821 } 822 ADVANCE(); 823 state++; 824 break; 825 826 case GZSTATE_METHOD: 827 if (*z.next_in != Z_DEFLATED) { 828 maybe_warnx("unknown compression method"); 829 goto stop_and_fail; 830 } 831 ADVANCE(); 832 state++; 833 break; 834 835 case GZSTATE_FLAGS: 836 flags = *z.next_in; 837 ADVANCE(); 838 skip_count = 6; 839 state++; 840 break; 841 842 case GZSTATE_SKIPPING: 843 if (skip_count > 0) { 844 skip_count--; 845 ADVANCE(); 846 } else 847 state++; 848 break; 849 850 case GZSTATE_EXTRA: 851 if ((flags & EXTRA_FIELD) == 0) { 852 state = GZSTATE_ORIGNAME; 853 break; 854 } 855 skip_count = *z.next_in; 856 ADVANCE(); 857 state++; 858 break; 859 860 case GZSTATE_EXTRA2: 861 skip_count |= ((*z.next_in) << 8); 862 ADVANCE(); 863 state++; 864 break; 865 866 case GZSTATE_EXTRA3: 867 if (skip_count > 0) { 868 skip_count--; 869 ADVANCE(); 870 } else 871 state++; 872 break; 873 874 case GZSTATE_ORIGNAME: 875 if ((flags & ORIG_NAME) == 0) { 876 state++; 877 break; 878 } 879 if (*z.next_in == 0) 880 state++; 881 ADVANCE(); 882 break; 883 884 case GZSTATE_COMMENT: 885 if ((flags & COMMENT) == 0) { 886 state++; 887 break; 888 } 889 if (*z.next_in == 0) 890 state++; 891 ADVANCE(); 892 break; 893 894 case GZSTATE_HEAD_CRC1: 895 if (flags & HEAD_CRC) 896 skip_count = 2; 897 else 898 skip_count = 0; 899 state++; 900 break; 901 902 case GZSTATE_HEAD_CRC2: 903 if (skip_count > 0) { 904 skip_count--; 905 ADVANCE(); 906 } else 907 state++; 908 break; 909 910 case GZSTATE_INIT: 911 if (inflateInit2(&z, -MAX_WBITS) != Z_OK) { 912 maybe_warnx("failed to inflateInit"); 913 goto stop_and_fail; 914 } 915 state++; 916 break; 917 918 case GZSTATE_READ: 919 error = inflate(&z, Z_FINISH); 920 switch (error) { 921 /* Z_BUF_ERROR goes with Z_FINISH... */ 922 case Z_BUF_ERROR: 923 case Z_STREAM_END: 924 case Z_OK: 925 break; 926 927 case Z_NEED_DICT: 928 maybe_warnx("Z_NEED_DICT error"); 929 goto stop_and_fail; 930 case Z_DATA_ERROR: 931 maybe_warnx("data stream error"); 932 goto stop_and_fail; 933 case Z_STREAM_ERROR: 934 maybe_warnx("internal stream error"); 935 goto stop_and_fail; 936 case Z_MEM_ERROR: 937 maybe_warnx("memory allocation error"); 938 goto stop_and_fail; 939 940 default: 941 maybe_warn("unknown error from inflate(): %d", 942 error); 943 } 944 wr = BUFLEN - z.avail_out; 945 946 if (wr != 0) { 947 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr); 948 if ( 949 #ifndef SMALL 950 /* don't write anything with -t */ 951 tflag == 0 && 952 #endif 953 write(out, outbufp, wr) != wr) { 954 maybe_warn("error writing to output"); 955 goto stop_and_fail; 956 } 957 958 out_tot += wr; 959 out_sub_tot += wr; 960 } 961 962 if (error == Z_STREAM_END) { 963 inflateEnd(&z); 964 state++; 965 } 966 967 z.next_out = (unsigned char *)outbufp; 968 z.avail_out = BUFLEN; 969 970 break; 971 case GZSTATE_CRC: 972 { 973 uLong origcrc; 974 975 if (z.avail_in < 4) { 976 if (!done_reading) { 977 needmore = 1; 978 continue; 979 } 980 maybe_warnx("truncated input"); 981 goto stop_and_fail; 982 } 983 origcrc = ((unsigned)z.next_in[0] & 0xff) | 984 ((unsigned)z.next_in[1] & 0xff) << 8 | 985 ((unsigned)z.next_in[2] & 0xff) << 16 | 986 ((unsigned)z.next_in[3] & 0xff) << 24; 987 if (origcrc != crc) { 988 maybe_warnx("invalid compressed" 989 " data--crc error"); 990 goto stop_and_fail; 991 } 992 } 993 994 z.avail_in -= 4; 995 z.next_in += 4; 996 997 if (!z.avail_in && done_reading) { 998 goto stop; 999 } 1000 state++; 1001 break; 1002 case GZSTATE_LEN: 1003 { 1004 uLong origlen; 1005 1006 if (z.avail_in < 4) { 1007 if (!done_reading) { 1008 needmore = 1; 1009 continue; 1010 } 1011 maybe_warnx("truncated input"); 1012 goto stop_and_fail; 1013 } 1014 origlen = ((unsigned)z.next_in[0] & 0xff) | 1015 ((unsigned)z.next_in[1] & 0xff) << 8 | 1016 ((unsigned)z.next_in[2] & 0xff) << 16 | 1017 ((unsigned)z.next_in[3] & 0xff) << 24; 1018 1019 if (origlen != out_sub_tot) { 1020 maybe_warnx("invalid compressed" 1021 " data--length error"); 1022 goto stop_and_fail; 1023 } 1024 } 1025 1026 z.avail_in -= 4; 1027 z.next_in += 4; 1028 1029 if (error < 0) { 1030 maybe_warnx("decompression error"); 1031 goto stop_and_fail; 1032 } 1033 state = GZSTATE_MAGIC0; 1034 break; 1035 } 1036 continue; 1037 stop_and_fail: 1038 out_tot = -1; 1039 stop: 1040 break; 1041 } 1042 if (state > GZSTATE_INIT) 1043 inflateEnd(&z); 1044 1045 free(inbufp); 1046 out1: 1047 free(outbufp); 1048 out2: 1049 if (gsizep) 1050 *gsizep = in_tot; 1051 return (out_tot); 1052 } 1053 1054 #ifndef SMALL 1055 /* 1056 * set the owner, mode, flags & utimes using the given file descriptor. 1057 * file is only used in possible warning messages. 1058 */ 1059 static void 1060 copymodes(int fd, const struct stat *sbp, const char *file) 1061 { 1062 struct timeval times[2]; 1063 struct stat sb; 1064 1065 /* 1066 * If we have no info on the input, give this file some 1067 * default values and return.. 1068 */ 1069 if (sbp == NULL) { 1070 mode_t mask = umask(022); 1071 1072 (void)fchmod(fd, DEFFILEMODE & ~mask); 1073 (void)umask(mask); 1074 return; 1075 } 1076 sb = *sbp; 1077 1078 /* if the chown fails, remove set-id bits as-per compress(1) */ 1079 if (fchown(fd, sb.st_uid, sb.st_gid) < 0) { 1080 if (errno != EPERM) 1081 maybe_warn("couldn't fchown: %s", file); 1082 sb.st_mode &= ~(S_ISUID|S_ISGID); 1083 } 1084 1085 /* we only allow set-id and the 9 normal permission bits */ 1086 sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 1087 if (fchmod(fd, sb.st_mode) < 0) 1088 maybe_warn("couldn't fchmod: %s", file); 1089 1090 TIMESPEC_TO_TIMEVAL(×[0], &sb.st_atim); 1091 TIMESPEC_TO_TIMEVAL(×[1], &sb.st_mtim); 1092 if (futimes(fd, times) < 0) 1093 maybe_warn("couldn't utimes: %s", file); 1094 1095 /* only try flags if they exist already */ 1096 if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0) 1097 maybe_warn("couldn't fchflags: %s", file); 1098 } 1099 #endif 1100 1101 /* what sort of file is this? */ 1102 static enum filetype 1103 file_gettype(u_char *buf) 1104 { 1105 1106 if (buf[0] == GZIP_MAGIC0 && 1107 (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1)) 1108 return FT_GZIP; 1109 else 1110 #ifndef NO_BZIP2_SUPPORT 1111 if (memcmp(buf, BZIP2_MAGIC, 3) == 0 && 1112 buf[3] >= '0' && buf[3] <= '9') 1113 return FT_BZIP2; 1114 else 1115 #endif 1116 #ifndef NO_COMPRESS_SUPPORT 1117 if (memcmp(buf, Z_MAGIC, 2) == 0) 1118 return FT_Z; 1119 else 1120 #endif 1121 #ifndef NO_PACK_SUPPORT 1122 if (memcmp(buf, PACK_MAGIC, 2) == 0) 1123 return FT_PACK; 1124 else 1125 #endif 1126 return FT_UNKNOWN; 1127 } 1128 1129 #ifndef SMALL 1130 /* check the outfile is OK. */ 1131 static int 1132 check_outfile(const char *outfile) 1133 { 1134 struct stat sb; 1135 int ok = 1; 1136 1137 if (lflag == 0 && stat(outfile, &sb) == 0) { 1138 if (fflag) 1139 unlink(outfile); 1140 else if (isatty(STDIN_FILENO)) { 1141 char ans[10] = { 'n', '\0' }; /* default */ 1142 1143 fprintf(stderr, "%s already exists -- do you wish to " 1144 "overwrite (y or n)? " , outfile); 1145 (void)fgets(ans, sizeof(ans) - 1, stdin); 1146 if (ans[0] != 'y' && ans[0] != 'Y') { 1147 fprintf(stderr, "\tnot overwriting\n"); 1148 ok = 0; 1149 } else 1150 unlink(outfile); 1151 } else { 1152 maybe_warnx("%s already exists -- skipping", outfile); 1153 ok = 0; 1154 } 1155 } 1156 return ok; 1157 } 1158 1159 static void 1160 unlink_input(const char *file, const struct stat *sb) 1161 { 1162 struct stat nsb; 1163 1164 if (kflag) 1165 return; 1166 if (stat(file, &nsb) != 0) 1167 /* Must be gone alrady */ 1168 return; 1169 if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino) 1170 /* Definitely a different file */ 1171 return; 1172 unlink(file); 1173 } 1174 #endif 1175 1176 static const suffixes_t * 1177 check_suffix(char *file, int xlate) 1178 { 1179 const suffixes_t *s; 1180 int len = strlen(file); 1181 char *sp; 1182 1183 for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) { 1184 /* if it doesn't fit in "a.suf", don't bother */ 1185 if (s->ziplen >= len) 1186 continue; 1187 sp = file + len - s->ziplen; 1188 if (strcmp(s->zipped, sp) != 0) 1189 continue; 1190 if (xlate) 1191 strcpy(sp, s->normal); 1192 return s; 1193 } 1194 return NULL; 1195 } 1196 1197 /* 1198 * compress the given file: create a corresponding .gz file and remove the 1199 * original. 1200 */ 1201 static off_t 1202 file_compress(char *file, char *outfile, size_t outsize) 1203 { 1204 int in; 1205 int out; 1206 off_t size, insize; 1207 #ifndef SMALL 1208 struct stat isb, osb; 1209 const suffixes_t *suff; 1210 #endif 1211 1212 in = open(file, O_RDONLY); 1213 if (in == -1) { 1214 maybe_warn("can't open %s", file); 1215 return -1; 1216 } 1217 1218 if (cflag == 0) { 1219 #ifndef SMALL 1220 if (fstat(in, &isb) == 0) { 1221 if (isb.st_nlink > 1 && fflag == 0) { 1222 maybe_warnx("%s has %d other link%s -- " 1223 "skipping", file, isb.st_nlink - 1, 1224 isb.st_nlink == 1 ? "" : "s"); 1225 close(in); 1226 return -1; 1227 } 1228 } 1229 1230 if (fflag == 0 && (suff = check_suffix(file, 0)) 1231 && suff->zipped[0] != 0) { 1232 maybe_warnx("%s already has %s suffix -- unchanged", 1233 file, suff->zipped); 1234 close(in); 1235 return -1; 1236 } 1237 #endif 1238 1239 /* Add (usually) .gz to filename */ 1240 if ((size_t)snprintf(outfile, outsize, "%s%s", 1241 file, suffixes[0].zipped) >= outsize) 1242 memcpy(outfile + outsize - suffixes[0].ziplen - 1, 1243 suffixes[0].zipped, suffixes[0].ziplen + 1); 1244 1245 #ifndef SMALL 1246 if (check_outfile(outfile) == 0) { 1247 close(in); 1248 return -1; 1249 } 1250 #endif 1251 } 1252 1253 if (cflag == 0) { 1254 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600); 1255 if (out == -1) { 1256 maybe_warn("could not create output: %s", outfile); 1257 fclose(stdin); 1258 return -1; 1259 } 1260 } else 1261 out = STDOUT_FILENO; 1262 1263 insize = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime); 1264 1265 (void)close(in); 1266 1267 /* 1268 * If there was an error, insize will be -1. 1269 * If we compressed to stdout, just return the size. 1270 * Otherwise stat the file and check it is the correct size. 1271 * We only blow away the file if we can stat the output and it 1272 * has the expected size. 1273 */ 1274 if (cflag != 0) 1275 return insize == -1 ? -1 : size; 1276 1277 #ifndef SMALL 1278 if (fstat(out, &osb) != 0) { 1279 maybe_warn("couldn't stat: %s", outfile); 1280 goto bad_outfile; 1281 } 1282 1283 if (osb.st_size != size) { 1284 maybe_warnx("output file: %s wrong size (%" PRIdOFF 1285 " != %" PRIdOFF "), deleting", 1286 outfile, osb.st_size, size); 1287 goto bad_outfile; 1288 } 1289 1290 copymodes(out, &isb, outfile); 1291 #endif 1292 if (close(out) == -1) 1293 maybe_warn("couldn't close output"); 1294 1295 /* output is good, ok to delete input */ 1296 unlink_input(file, &isb); 1297 return size; 1298 1299 #ifndef SMALL 1300 bad_outfile: 1301 if (close(out) == -1) 1302 maybe_warn("couldn't close output"); 1303 1304 maybe_warnx("leaving original %s", file); 1305 unlink(outfile); 1306 return size; 1307 #endif 1308 } 1309 1310 /* uncompress the given file and remove the original */ 1311 static off_t 1312 file_uncompress(char *file, char *outfile, size_t outsize) 1313 { 1314 struct stat isb, osb; 1315 off_t size; 1316 ssize_t rbytes; 1317 unsigned char header1[4]; 1318 enum filetype method; 1319 int fd, ofd, zfd = -1; 1320 #ifndef SMALL 1321 ssize_t rv; 1322 time_t timestamp = 0; 1323 unsigned char name[PATH_MAX + 1]; 1324 #endif 1325 1326 /* gather the old name info */ 1327 1328 fd = open(file, O_RDONLY); 1329 if (fd < 0) { 1330 maybe_warn("can't open %s", file); 1331 goto lose; 1332 } 1333 1334 strlcpy(outfile, file, outsize); 1335 if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) { 1336 maybe_warnx("%s: unknown suffix -- ignored", file); 1337 goto lose; 1338 } 1339 1340 rbytes = read(fd, header1, sizeof header1); 1341 if (rbytes != sizeof header1) { 1342 /* we don't want to fail here. */ 1343 #ifndef SMALL 1344 if (fflag) 1345 goto lose; 1346 #endif 1347 if (rbytes == -1) 1348 maybe_warn("can't read %s", file); 1349 else 1350 goto unexpected_EOF; 1351 goto lose; 1352 } 1353 1354 method = file_gettype(header1); 1355 1356 #ifndef SMALL 1357 if (fflag == 0 && method == FT_UNKNOWN) { 1358 maybe_warnx("%s: not in gzip format", file); 1359 goto lose; 1360 } 1361 1362 #endif 1363 1364 #ifndef SMALL 1365 if (method == FT_GZIP && Nflag) { 1366 unsigned char ts[4]; /* timestamp */ 1367 1368 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP); 1369 if (rv >= 0 && rv < (ssize_t)(sizeof ts)) 1370 goto unexpected_EOF; 1371 if (rv == -1) { 1372 if (!fflag) 1373 maybe_warn("can't read %s", file); 1374 goto lose; 1375 } 1376 timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0]; 1377 1378 if (header1[3] & ORIG_NAME) { 1379 rbytes = pread(fd, name, sizeof name, GZIP_ORIGNAME); 1380 if (rbytes < 0) { 1381 maybe_warn("can't read %s", file); 1382 goto lose; 1383 } 1384 if (name[0] != 0) { 1385 /* preserve original directory name */ 1386 char *dp = strrchr(file, '/'); 1387 if (dp == NULL) 1388 dp = file; 1389 else 1390 dp++; 1391 snprintf(outfile, outsize, "%.*s%.*s", 1392 (int) (dp - file), 1393 file, (int) rbytes, name); 1394 } 1395 } 1396 } 1397 #endif 1398 lseek(fd, 0, SEEK_SET); 1399 1400 if (cflag == 0 || lflag) { 1401 if (fstat(fd, &isb) != 0) 1402 goto lose; 1403 #ifndef SMALL 1404 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) { 1405 maybe_warnx("%s has %d other links -- skipping", 1406 file, isb.st_nlink - 1); 1407 goto lose; 1408 } 1409 if (nflag == 0 && timestamp) 1410 isb.st_mtime = timestamp; 1411 if (check_outfile(outfile) == 0) 1412 goto lose; 1413 #endif 1414 } 1415 1416 if (cflag == 0 && lflag == 0) { 1417 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600); 1418 if (zfd == STDOUT_FILENO) { 1419 /* We won't close STDOUT_FILENO later... */ 1420 zfd = dup(zfd); 1421 close(STDOUT_FILENO); 1422 } 1423 if (zfd == -1) { 1424 maybe_warn("can't open %s", outfile); 1425 goto lose; 1426 } 1427 } else 1428 zfd = STDOUT_FILENO; 1429 1430 #ifndef NO_BZIP2_SUPPORT 1431 if (method == FT_BZIP2) { 1432 1433 /* XXX */ 1434 if (lflag) { 1435 maybe_warnx("no -l with bzip2 files"); 1436 goto lose; 1437 } 1438 1439 size = unbzip2(fd, zfd, NULL, 0, NULL); 1440 } else 1441 #endif 1442 1443 #ifndef NO_COMPRESS_SUPPORT 1444 if (method == FT_Z) { 1445 FILE *in, *out; 1446 1447 /* XXX */ 1448 if (lflag) { 1449 maybe_warnx("no -l with Lempel-Ziv files"); 1450 goto lose; 1451 } 1452 1453 if ((in = zdopen(fd)) == NULL) { 1454 maybe_warn("zdopen for read: %s", file); 1455 goto lose; 1456 } 1457 1458 out = fdopen(dup(zfd), "w"); 1459 if (out == NULL) { 1460 maybe_warn("fdopen for write: %s", outfile); 1461 fclose(in); 1462 goto lose; 1463 } 1464 1465 size = zuncompress(in, out, NULL, 0, NULL); 1466 /* need to fclose() if ferror() is true... */ 1467 if (ferror(in) | fclose(in)) { 1468 maybe_warn("failed infile fclose"); 1469 unlink(outfile); 1470 (void)fclose(out); 1471 } 1472 if (fclose(out) != 0) { 1473 maybe_warn("failed outfile fclose"); 1474 unlink(outfile); 1475 goto lose; 1476 } 1477 } else 1478 #endif 1479 1480 #ifndef NO_PACK_SUPPORT 1481 if (method == FT_PACK) { 1482 if (lflag) { 1483 maybe_warnx("no -l with packed files"); 1484 goto lose; 1485 } 1486 1487 size = unpack(fd, zfd, NULL, 0, NULL); 1488 } else 1489 #endif 1490 1491 #ifndef SMALL 1492 if (method == FT_UNKNOWN) { 1493 if (lflag) { 1494 maybe_warnx("no -l for unknown filetypes"); 1495 goto lose; 1496 } 1497 size = cat_fd(NULL, 0, NULL, fd); 1498 } else 1499 #endif 1500 { 1501 if (lflag) { 1502 print_list(fd, isb.st_size, outfile, isb.st_mtime); 1503 close(fd); 1504 return -1; /* XXX */ 1505 } 1506 1507 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file); 1508 } 1509 1510 if (close(fd) != 0) 1511 maybe_warn("couldn't close input"); 1512 if (zfd != STDOUT_FILENO && close(zfd) != 0) 1513 maybe_warn("couldn't close output"); 1514 1515 if (size == -1) { 1516 if (cflag == 0) 1517 unlink(outfile); 1518 maybe_warnx("%s: uncompress failed", file); 1519 return -1; 1520 } 1521 1522 /* if testing, or we uncompressed to stdout, this is all we need */ 1523 #ifndef SMALL 1524 if (tflag) 1525 return size; 1526 #endif 1527 /* if we are uncompressing to stdin, don't remove the file. */ 1528 if (cflag) 1529 return size; 1530 1531 /* 1532 * if we create a file... 1533 */ 1534 /* 1535 * if we can't stat the file don't remove the file. 1536 */ 1537 1538 ofd = open(outfile, O_RDWR, 0); 1539 if (ofd == -1) { 1540 maybe_warn("couldn't open (leaving original): %s", 1541 outfile); 1542 return -1; 1543 } 1544 if (fstat(ofd, &osb) != 0) { 1545 maybe_warn("couldn't stat (leaving original): %s", 1546 outfile); 1547 close(ofd); 1548 return -1; 1549 } 1550 if (osb.st_size != size) { 1551 maybe_warnx("stat gave different size: %" PRIdOFF 1552 " != %" PRIdOFF " (leaving original)", 1553 size, osb.st_size); 1554 close(ofd); 1555 unlink(outfile); 1556 return -1; 1557 } 1558 unlink_input(file, &isb); 1559 #ifndef SMALL 1560 copymodes(ofd, &isb, outfile); 1561 #endif 1562 close(ofd); 1563 return size; 1564 1565 unexpected_EOF: 1566 maybe_warnx("%s: unexpected end of file", file); 1567 lose: 1568 if (fd != -1) 1569 close(fd); 1570 if (zfd != -1 && zfd != STDOUT_FILENO) 1571 close(fd); 1572 return -1; 1573 } 1574 1575 #ifndef SMALL 1576 static off_t 1577 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd) 1578 { 1579 char buf[BUFLEN]; 1580 off_t in_tot; 1581 ssize_t w; 1582 1583 in_tot = count; 1584 w = write(STDOUT_FILENO, prepend, count); 1585 if (w == -1 || (size_t)w != count) { 1586 maybe_warn("write to stdout"); 1587 return -1; 1588 } 1589 for (;;) { 1590 ssize_t rv; 1591 1592 rv = read(fd, buf, sizeof buf); 1593 if (rv == 0) 1594 break; 1595 if (rv < 0) { 1596 maybe_warn("read from fd %d", fd); 1597 break; 1598 } 1599 1600 if (write(STDOUT_FILENO, buf, rv) != rv) { 1601 maybe_warn("write to stdout"); 1602 break; 1603 } 1604 in_tot += rv; 1605 } 1606 1607 if (gsizep) 1608 *gsizep = in_tot; 1609 return (in_tot); 1610 } 1611 #endif 1612 1613 static void 1614 handle_stdin(void) 1615 { 1616 unsigned char header1[4]; 1617 off_t usize, gsize; 1618 enum filetype method; 1619 ssize_t bytes_read; 1620 #ifndef NO_COMPRESS_SUPPORT 1621 FILE *in; 1622 #endif 1623 1624 #ifndef SMALL 1625 if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) { 1626 maybe_warnx("standard input is a terminal -- ignoring"); 1627 return; 1628 } 1629 #endif 1630 1631 if (lflag) { 1632 struct stat isb; 1633 1634 /* XXX could read the whole file, etc. */ 1635 if (fstat(STDIN_FILENO, &isb) < 0) { 1636 maybe_warn("fstat"); 1637 return; 1638 } 1639 print_list(STDIN_FILENO, isb.st_size, "stdout", isb.st_mtime); 1640 return; 1641 } 1642 1643 bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1); 1644 if (bytes_read == -1) { 1645 maybe_warn("can't read stdin"); 1646 return; 1647 } else if (bytes_read != sizeof(header1)) { 1648 maybe_warnx("(stdin): unexpected end of file"); 1649 return; 1650 } 1651 1652 method = file_gettype(header1); 1653 switch (method) { 1654 default: 1655 #ifndef SMALL 1656 if (fflag == 0) { 1657 maybe_warnx("unknown compression format"); 1658 return; 1659 } 1660 usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO); 1661 break; 1662 #endif 1663 case FT_GZIP: 1664 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO, 1665 (char *)header1, sizeof header1, &gsize, "(stdin)"); 1666 break; 1667 #ifndef NO_BZIP2_SUPPORT 1668 case FT_BZIP2: 1669 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO, 1670 (char *)header1, sizeof header1, &gsize); 1671 break; 1672 #endif 1673 #ifndef NO_COMPRESS_SUPPORT 1674 case FT_Z: 1675 if ((in = zdopen(STDIN_FILENO)) == NULL) { 1676 maybe_warnx("zopen of stdin"); 1677 return; 1678 } 1679 1680 usize = zuncompress(in, stdout, (char *)header1, sizeof header1, &gsize); 1681 fclose(in); 1682 break; 1683 #endif 1684 #ifndef NO_PACK_SUPPORT 1685 case FT_PACK: 1686 usize = unpack(STDIN_FILENO, STDOUT_FILENO, 1687 (char *)header1, sizeof header1, &gsize); 1688 break; 1689 #endif 1690 } 1691 1692 #ifndef SMALL 1693 if (vflag && !tflag && usize != -1 && gsize != -1) 1694 print_verbage(NULL, NULL, usize, gsize); 1695 if (vflag && tflag) 1696 print_test("(stdin)", usize != -1); 1697 #endif 1698 1699 } 1700 1701 static void 1702 handle_stdout(void) 1703 { 1704 off_t gsize, usize; 1705 struct stat sb; 1706 time_t systime; 1707 uint32_t mtime; 1708 int ret; 1709 1710 #ifndef SMALL 1711 if (fflag == 0 && isatty(STDOUT_FILENO)) { 1712 maybe_warnx("standard output is a terminal -- ignoring"); 1713 return; 1714 } 1715 #endif 1716 /* If stdin is a file use it's mtime, otherwise use current time */ 1717 ret = fstat(STDIN_FILENO, &sb); 1718 1719 #ifndef SMALL 1720 if (ret < 0) { 1721 maybe_warn("Can't stat stdin"); 1722 return; 1723 } 1724 #endif 1725 1726 if (S_ISREG(sb.st_mode)) 1727 mtime = (uint32_t)sb.st_mtime; 1728 else { 1729 systime = time(NULL); 1730 #ifndef SMALL 1731 if (systime == -1) { 1732 maybe_warn("time"); 1733 return; 1734 } 1735 #endif 1736 mtime = (uint32_t)systime; 1737 } 1738 1739 usize = gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime); 1740 #ifndef SMALL 1741 if (vflag && !tflag && usize != -1 && gsize != -1) 1742 print_verbage(NULL, NULL, usize, gsize); 1743 #endif 1744 } 1745 1746 /* do what is asked for, for the path name */ 1747 static void 1748 handle_pathname(char *path) 1749 { 1750 char *opath = path, *s = NULL; 1751 ssize_t len; 1752 int slen; 1753 struct stat sb; 1754 1755 /* check for stdout/stdin */ 1756 if (path[0] == '-' && path[1] == '\0') { 1757 if (dflag) 1758 handle_stdin(); 1759 else 1760 handle_stdout(); 1761 return; 1762 } 1763 1764 retry: 1765 if (stat(path, &sb) != 0) { 1766 /* lets try <path>.gz if we're decompressing */ 1767 if (dflag && s == NULL && errno == ENOENT) { 1768 len = strlen(path); 1769 slen = suffixes[0].ziplen; 1770 s = malloc(len + slen + 1); 1771 if (s == NULL) 1772 maybe_err("malloc"); 1773 memcpy(s, path, len); 1774 memcpy(s + len, suffixes[0].zipped, slen + 1); 1775 path = s; 1776 goto retry; 1777 } 1778 maybe_warn("can't stat: %s", opath); 1779 goto out; 1780 } 1781 1782 if (S_ISDIR(sb.st_mode)) { 1783 #ifndef SMALL 1784 if (rflag) 1785 handle_dir(path); 1786 else 1787 #endif 1788 maybe_warnx("%s is a directory", path); 1789 goto out; 1790 } 1791 1792 if (S_ISREG(sb.st_mode)) 1793 handle_file(path, &sb); 1794 else 1795 maybe_warnx("%s is not a regular file", path); 1796 1797 out: 1798 if (s) 1799 free(s); 1800 } 1801 1802 /* compress/decompress a file */ 1803 static void 1804 handle_file(char *file, struct stat *sbp) 1805 { 1806 off_t usize, gsize; 1807 char outfile[PATH_MAX]; 1808 1809 infile = file; 1810 if (dflag) { 1811 usize = file_uncompress(file, outfile, sizeof(outfile)); 1812 #ifndef SMALL 1813 if (vflag && tflag) 1814 print_test(file, usize != -1); 1815 #endif 1816 if (usize == -1) 1817 return; 1818 gsize = sbp->st_size; 1819 } else { 1820 gsize = file_compress(file, outfile, sizeof(outfile)); 1821 if (gsize == -1) 1822 return; 1823 usize = sbp->st_size; 1824 } 1825 1826 1827 #ifndef SMALL 1828 if (vflag && !tflag) 1829 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize); 1830 #endif 1831 } 1832 1833 #ifndef SMALL 1834 /* this is used with -r to recursively descend directories */ 1835 static void 1836 handle_dir(char *dir) 1837 { 1838 char *path_argv[2]; 1839 FTS *fts; 1840 FTSENT *entry; 1841 1842 path_argv[0] = dir; 1843 path_argv[1] = 0; 1844 fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL); 1845 if (fts == NULL) { 1846 warn("couldn't fts_open %s", dir); 1847 return; 1848 } 1849 1850 while ((entry = fts_read(fts))) { 1851 switch(entry->fts_info) { 1852 case FTS_D: 1853 case FTS_DP: 1854 continue; 1855 1856 case FTS_DNR: 1857 case FTS_ERR: 1858 case FTS_NS: 1859 maybe_warn("%s", entry->fts_path); 1860 continue; 1861 case FTS_F: 1862 handle_file(entry->fts_path, entry->fts_statp); 1863 } 1864 } 1865 (void)fts_close(fts); 1866 } 1867 #endif 1868 1869 /* print a ratio - size reduction as a fraction of uncompressed size */ 1870 static void 1871 print_ratio(off_t in, off_t out, FILE *where) 1872 { 1873 int percent10; /* 10 * percent */ 1874 off_t diff; 1875 char buff[8]; 1876 int len; 1877 1878 diff = in - out/2; 1879 if (diff <= 0) 1880 /* 1881 * Output is more than double size of input! print -99.9% 1882 * Quite possibly we've failed to get the original size. 1883 */ 1884 percent10 = -999; 1885 else { 1886 /* 1887 * We only need 12 bits of result from the final division, 1888 * so reduce the values until a 32bit division will suffice. 1889 */ 1890 while (in > 0x100000) { 1891 diff >>= 1; 1892 in >>= 1; 1893 } 1894 if (in != 0) 1895 percent10 = ((u_int)diff * 2000) / (u_int)in - 1000; 1896 else 1897 percent10 = 0; 1898 } 1899 1900 len = snprintf(buff, sizeof buff, "%2.2d.", percent10); 1901 /* Move the '.' to before the last digit */ 1902 buff[len - 1] = buff[len - 2]; 1903 buff[len - 2] = '.'; 1904 fprintf(where, "%5s%%", buff); 1905 } 1906 1907 #ifndef SMALL 1908 /* print compression statistics, and the new name (if there is one!) */ 1909 static void 1910 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize) 1911 { 1912 if (file) 1913 fprintf(stderr, "%s:%s ", file, 1914 strlen(file) < 7 ? "\t\t" : "\t"); 1915 print_ratio(usize, gsize, stderr); 1916 if (nfile) 1917 fprintf(stderr, " -- replaced with %s", nfile); 1918 fprintf(stderr, "\n"); 1919 fflush(stderr); 1920 } 1921 1922 /* print test results */ 1923 static void 1924 print_test(const char *file, int ok) 1925 { 1926 1927 if (exit_value == 0 && ok == 0) 1928 exit_value = 1; 1929 fprintf(stderr, "%s:%s %s\n", file, 1930 strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK"); 1931 fflush(stderr); 1932 } 1933 #endif 1934 1935 /* print a file's info ala --list */ 1936 /* eg: 1937 compressed uncompressed ratio uncompressed_name 1938 354841 1679360 78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar 1939 */ 1940 static void 1941 print_list(int fd, off_t out, const char *outfile, time_t ts) 1942 { 1943 static int first = 1; 1944 #ifndef SMALL 1945 static off_t in_tot, out_tot; 1946 uint32_t crc = 0; 1947 #endif 1948 off_t in = 0, rv; 1949 1950 if (first) { 1951 #ifndef SMALL 1952 if (vflag) 1953 printf("method crc date time "); 1954 #endif 1955 if (qflag == 0) 1956 printf(" compressed uncompressed " 1957 "ratio uncompressed_name\n"); 1958 } 1959 first = 0; 1960 1961 /* print totals? */ 1962 #ifndef SMALL 1963 if (fd == -1) { 1964 in = in_tot; 1965 out = out_tot; 1966 } else 1967 #endif 1968 { 1969 /* read the last 4 bytes - this is the uncompressed size */ 1970 rv = lseek(fd, (off_t)(-8), SEEK_END); 1971 if (rv != -1) { 1972 unsigned char buf[8]; 1973 uint32_t usize; 1974 1975 rv = read(fd, (char *)buf, sizeof(buf)); 1976 if (rv == -1) 1977 maybe_warn("read of uncompressed size"); 1978 else if (rv != sizeof(buf)) 1979 maybe_warnx("read of uncompressed size"); 1980 1981 else { 1982 usize = buf[4] | buf[5] << 8 | 1983 buf[6] << 16 | buf[7] << 24; 1984 in = (off_t)usize; 1985 #ifndef SMALL 1986 crc = buf[0] | buf[1] << 8 | 1987 buf[2] << 16 | buf[3] << 24; 1988 #endif 1989 } 1990 } 1991 } 1992 1993 #ifndef SMALL 1994 if (vflag && fd == -1) 1995 printf(" "); 1996 else if (vflag) { 1997 char *date = ctime(&ts); 1998 1999 /* skip the day, 1/100th second, and year */ 2000 date += 4; 2001 date[12] = 0; 2002 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date); 2003 } 2004 in_tot += in; 2005 out_tot += out; 2006 #else 2007 (void)&ts; /* XXX */ 2008 #endif 2009 printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in); 2010 print_ratio(in, out, stdout); 2011 printf(" %s\n", outfile); 2012 } 2013 2014 /* display the usage of NetBSD gzip */ 2015 static void 2016 usage(void) 2017 { 2018 2019 fprintf(stderr, "%s\n", gzip_version); 2020 fprintf(stderr, 2021 #ifdef SMALL 2022 "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n", 2023 #else 2024 "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n" 2025 " -1 --fast fastest (worst) compression\n" 2026 " -2 .. -8 set compression level\n" 2027 " -9 --best best (slowest) compression\n" 2028 " -c --stdout write to stdout, keep original files\n" 2029 " --to-stdout\n" 2030 " -d --decompress uncompress files\n" 2031 " --uncompress\n" 2032 " -f --force force overwriting & compress links\n" 2033 " -h --help display this help\n" 2034 " -k --keep don't delete input files during operation\n" 2035 " -l --list list compressed file contents\n" 2036 " -N --name save or restore original file name and time stamp\n" 2037 " -n --no-name don't save original file name or time stamp\n" 2038 " -q --quiet output no warnings\n" 2039 " -r --recursive recursively compress files in directories\n" 2040 " -S .suf use suffix .suf instead of .gz\n" 2041 " --suffix .suf\n" 2042 " -t --test test compressed file\n" 2043 " -V --version display program version\n" 2044 " -v --verbose print extra statistics\n", 2045 #endif 2046 getprogname()); 2047 exit(0); 2048 } 2049 2050 #ifndef SMALL 2051 /* display the license information of FreeBSD gzip */ 2052 static void 2053 display_license(void) 2054 { 2055 2056 fprintf(stderr, "%s (based on NetBSD gzip 20091011)\n", gzip_version); 2057 fprintf(stderr, "%s\n", gzip_copyright); 2058 exit(0); 2059 } 2060 #endif 2061 2062 /* display the version of NetBSD gzip */ 2063 static void 2064 display_version(void) 2065 { 2066 2067 fprintf(stderr, "%s\n", gzip_version); 2068 exit(0); 2069 } 2070 2071 #ifndef NO_BZIP2_SUPPORT 2072 #include "unbzip2.c" 2073 #endif 2074 #ifndef NO_COMPRESS_SUPPORT 2075 #include "zuncompress.c" 2076 #endif 2077 #ifndef NO_PACK_SUPPORT 2078 #include "unpack.c" 2079 #endif 2080 2081 static ssize_t 2082 read_retry(int fd, void *buf, size_t sz) 2083 { 2084 char *cp = buf; 2085 size_t left = MIN(sz, (size_t) SSIZE_MAX); 2086 2087 while (left > 0) { 2088 ssize_t ret; 2089 2090 ret = read(fd, cp, left); 2091 if (ret == -1) { 2092 return ret; 2093 } else if (ret == 0) { 2094 break; /* EOF */ 2095 } 2096 cp += ret; 2097 left -= ret; 2098 } 2099 2100 return sz - left; 2101 } 2102