1 /* $NetBSD: gzip.c,v 1.87 2006/10/13 20:17:46 mlelstv 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 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 25 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 #ifndef lint 33 __COPYRIGHT("@(#) Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green\n\ 34 All rights reserved.\n"); 35 __RCSID("$NetBSD: gzip.c,v 1.87 2006/10/13 20:17:46 mlelstv Exp $"); 36 #endif /* not lint */ 37 38 /* 39 * gzip.c -- GPL free gzip using zlib. 40 * 41 * RFC 1950 covers the zlib format 42 * RFC 1951 covers the deflate format 43 * RFC 1952 covers the gzip format 44 * 45 * TODO: 46 * - use mmap where possible 47 * - handle some signals better (remove outfile?) 48 * - make bzip2/compress -v/-t/-l support work as well as possible 49 */ 50 51 #include <sys/param.h> 52 #include <sys/stat.h> 53 #include <sys/time.h> 54 55 #include <inttypes.h> 56 #include <unistd.h> 57 #include <stdio.h> 58 #include <string.h> 59 #include <stdlib.h> 60 #include <err.h> 61 #include <errno.h> 62 #include <fcntl.h> 63 #include <zlib.h> 64 #include <fts.h> 65 #include <libgen.h> 66 #include <stdarg.h> 67 #include <getopt.h> 68 #include <time.h> 69 70 #ifndef PRIdOFF 71 #define PRIdOFF PRId64 72 #endif 73 74 /* what type of file are we dealing with */ 75 enum filetype { 76 FT_GZIP, 77 #ifndef NO_BZIP2_SUPPORT 78 FT_BZIP2, 79 #endif 80 #ifndef NO_COMPRESS_SUPPORT 81 FT_Z, 82 #endif 83 FT_LAST, 84 FT_UNKNOWN 85 }; 86 87 #ifndef NO_BZIP2_SUPPORT 88 #include <bzlib.h> 89 90 #define BZ2_SUFFIX ".bz2" 91 #define BZIP2_MAGIC "\102\132\150" 92 #endif 93 94 #ifndef NO_COMPRESS_SUPPORT 95 #define Z_SUFFIX ".Z" 96 #define Z_MAGIC "\037\235" 97 #endif 98 99 #define GZ_SUFFIX ".gz" 100 101 #define BUFLEN (64 * 1024) 102 103 #define GZIP_MAGIC0 0x1F 104 #define GZIP_MAGIC1 0x8B 105 #define GZIP_OMAGIC1 0x9E 106 107 #define GZIP_TIMESTAMP (off_t)4 108 #define GZIP_ORIGNAME (off_t)10 109 110 #define HEAD_CRC 0x02 111 #define EXTRA_FIELD 0x04 112 #define ORIG_NAME 0x08 113 #define COMMENT 0x10 114 115 #define OS_CODE 3 /* Unix */ 116 117 typedef struct { 118 const char *zipped; 119 int ziplen; 120 const char *normal; /* for unzip - must not be longer than zipped */ 121 } suffixes_t; 122 static suffixes_t suffixes[] = { 123 #define SUFFIX(Z, N) {Z, sizeof Z - 1, N} 124 SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S .xxx */ 125 #ifndef SMALL 126 SUFFIX(GZ_SUFFIX, ""), 127 SUFFIX(".z", ""), 128 SUFFIX("-gz", ""), 129 SUFFIX("-z", ""), 130 SUFFIX("_z", ""), 131 SUFFIX(".taz", ".tar"), 132 SUFFIX(".tgz", ".tar"), 133 #ifndef NO_BZIP2_SUPPORT 134 SUFFIX(BZ2_SUFFIX, ""), 135 #endif 136 #ifndef NO_COMPRESS_SUPPORT 137 SUFFIX(Z_SUFFIX, ""), 138 #endif 139 SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S "" */ 140 #endif /* SMALL */ 141 #undef SUFFIX 142 }; 143 #define NUM_SUFFIXES (sizeof suffixes / sizeof suffixes[0]) 144 145 static const char gzip_version[] = "NetBSD gzip 20060927"; 146 147 static int cflag; /* stdout mode */ 148 static int dflag; /* decompress mode */ 149 static int lflag; /* list mode */ 150 static int numflag = 6; /* gzip -1..-9 value */ 151 152 #ifndef SMALL 153 static int fflag; /* force mode */ 154 static int nflag; /* don't save name/timestamp */ 155 static int Nflag; /* don't restore name/timestamp */ 156 static int qflag; /* quiet mode */ 157 static int rflag; /* recursive mode */ 158 static int tflag; /* test */ 159 static int vflag; /* verbose mode */ 160 #else 161 #define qflag 0 162 #define tflag 0 163 #endif 164 165 static int exit_value = 0; /* exit value */ 166 167 static char *infile; /* name of file coming in */ 168 169 static void maybe_err(const char *fmt, ...) 170 __attribute__((__format__(__printf__, 1, 2))); 171 #ifndef NO_BZIP2_SUPPORT 172 static void maybe_errx(const char *fmt, ...) 173 __attribute__((__format__(__printf__, 1, 2))); 174 #endif 175 static void maybe_warn(const char *fmt, ...) 176 __attribute__((__format__(__printf__, 1, 2))); 177 static void maybe_warnx(const char *fmt, ...) 178 __attribute__((__format__(__printf__, 1, 2))); 179 static enum filetype file_gettype(u_char *); 180 #ifdef SMALL 181 #define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz) 182 #endif 183 static off_t gz_compress(int, int, off_t *, const char *, uint32_t); 184 static off_t gz_uncompress(int, int, char *, size_t, off_t *, const char *); 185 static off_t file_compress(char *, char *, size_t); 186 static off_t file_uncompress(char *, char *, size_t); 187 static void handle_pathname(char *); 188 static void handle_file(char *, struct stat *); 189 static void handle_stdin(void); 190 static void handle_stdout(void); 191 static void print_ratio(off_t, off_t, FILE *); 192 static void print_list(int fd, off_t, const char *, time_t); 193 static void usage(void); 194 static void display_version(void); 195 static const suffixes_t *check_suffix(char *, int); 196 static ssize_t read_retry(int, void *, size_t); 197 198 #ifdef SMALL 199 #define unlink_input(f, sb) unlink(f) 200 #else 201 static off_t cat_fd(unsigned char *, size_t, off_t *, int fd); 202 static void prepend_gzip(char *, int *, char ***); 203 static void handle_dir(char *); 204 static void print_verbage(const char *, const char *, off_t, off_t); 205 static void print_test(const char *, int); 206 static void copymodes(int fd, const struct stat *, const char *file); 207 static int check_outfile(const char *outfile); 208 #endif 209 210 #ifndef NO_BZIP2_SUPPORT 211 static off_t unbzip2(int, int, char *, size_t, off_t *); 212 #endif 213 214 #ifndef NO_COMPRESS_SUPPORT 215 static FILE *zdopen(int); 216 static off_t zuncompress(FILE *, FILE *, char *, size_t, off_t *); 217 #endif 218 219 int main(int, char *p[]); 220 221 #ifdef SMALL 222 #define getopt_long(a,b,c,d,e) getopt(a,b,c) 223 #else 224 static const struct option longopts[] = { 225 { "stdout", no_argument, 0, 'c' }, 226 { "to-stdout", no_argument, 0, 'c' }, 227 { "decompress", no_argument, 0, 'd' }, 228 { "uncompress", no_argument, 0, 'd' }, 229 { "force", no_argument, 0, 'f' }, 230 { "help", no_argument, 0, 'h' }, 231 { "list", no_argument, 0, 'l' }, 232 { "no-name", no_argument, 0, 'n' }, 233 { "name", no_argument, 0, 'N' }, 234 { "quiet", no_argument, 0, 'q' }, 235 { "recursive", no_argument, 0, 'r' }, 236 { "suffix", required_argument, 0, 'S' }, 237 { "test", no_argument, 0, 't' }, 238 { "verbose", no_argument, 0, 'v' }, 239 { "version", no_argument, 0, 'V' }, 240 { "fast", no_argument, 0, '1' }, 241 { "best", no_argument, 0, '9' }, 242 #if 0 243 /* 244 * This is what else GNU gzip implements. --ascii isn't useful 245 * on NetBSD, and I don't care to have a --license. 246 */ 247 { "ascii", no_argument, 0, 'a' }, 248 { "license", no_argument, 0, 'L' }, 249 #endif 250 { NULL, no_argument, 0, 0 }, 251 }; 252 #endif 253 254 int 255 main(int argc, char **argv) 256 { 257 const char *progname = getprogname(); 258 #ifndef SMALL 259 char *gzip; 260 int len; 261 #endif 262 int ch; 263 264 /* XXX set up signals */ 265 266 #ifndef SMALL 267 if ((gzip = getenv("GZIP")) != NULL) 268 prepend_gzip(gzip, &argc, &argv); 269 #endif 270 271 /* 272 * XXX 273 * handle being called `gunzip', `zcat' and `gzcat' 274 */ 275 if (strcmp(progname, "gunzip") == 0) 276 dflag = 1; 277 else if (strcmp(progname, "zcat") == 0 || 278 strcmp(progname, "gzcat") == 0) 279 dflag = cflag = 1; 280 281 #ifdef SMALL 282 #define OPT_LIST "123456789cdhltV" 283 #else 284 #define OPT_LIST "123456789cdfhlNnqrS:tVv" 285 #endif 286 287 while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) { 288 switch (ch) { 289 case '1': case '2': case '3': 290 case '4': case '5': case '6': 291 case '7': case '8': case '9': 292 numflag = ch - '0'; 293 break; 294 case 'c': 295 cflag = 1; 296 break; 297 case 'd': 298 dflag = 1; 299 break; 300 case 'l': 301 lflag = 1; 302 dflag = 1; 303 break; 304 case 'V': 305 display_version(); 306 /* NOTREACHED */ 307 #ifndef SMALL 308 case 'f': 309 fflag = 1; 310 break; 311 case 'N': 312 nflag = 0; 313 Nflag = 1; 314 break; 315 case 'n': 316 nflag = 1; 317 Nflag = 0; 318 break; 319 case 'q': 320 qflag = 1; 321 break; 322 case 'r': 323 rflag = 1; 324 break; 325 case 'S': 326 len = strlen(optarg); 327 if (len != 0) { 328 suffixes[0].zipped = optarg; 329 suffixes[0].ziplen = len; 330 } else { 331 suffixes[NUM_SUFFIXES - 1].zipped = ""; 332 suffixes[NUM_SUFFIXES - 1].ziplen = 0; 333 } 334 break; 335 case 't': 336 cflag = 1; 337 tflag = 1; 338 dflag = 1; 339 break; 340 case 'v': 341 vflag = 1; 342 break; 343 #endif 344 default: 345 usage(); 346 /* NOTREACHED */ 347 } 348 } 349 argv += optind; 350 argc -= optind; 351 352 if (argc == 0) { 353 if (dflag) /* stdin mode */ 354 handle_stdin(); 355 else /* stdout mode */ 356 handle_stdout(); 357 } else { 358 do { 359 handle_pathname(argv[0]); 360 } while (*++argv); 361 } 362 #ifndef SMALL 363 if (qflag == 0 && lflag && argc > 1) 364 print_list(-1, 0, "(totals)", 0); 365 #endif 366 exit(exit_value); 367 } 368 369 /* maybe print a warning */ 370 void 371 maybe_warn(const char *fmt, ...) 372 { 373 va_list ap; 374 375 if (qflag == 0) { 376 va_start(ap, fmt); 377 vwarn(fmt, ap); 378 va_end(ap); 379 } 380 if (exit_value == 0) 381 exit_value = 1; 382 } 383 384 /* ... without an errno. */ 385 void 386 maybe_warnx(const char *fmt, ...) 387 { 388 va_list ap; 389 390 if (qflag == 0) { 391 va_start(ap, fmt); 392 vwarnx(fmt, ap); 393 va_end(ap); 394 } 395 if (exit_value == 0) 396 exit_value = 1; 397 } 398 399 /* maybe print an error */ 400 void 401 maybe_err(const char *fmt, ...) 402 { 403 va_list ap; 404 405 if (qflag == 0) { 406 va_start(ap, fmt); 407 vwarn(fmt, ap); 408 va_end(ap); 409 } 410 exit(2); 411 } 412 413 #ifndef NO_BZIP2_SUPPORT 414 /* ... without an errno. */ 415 void 416 maybe_errx(const char *fmt, ...) 417 { 418 va_list ap; 419 420 if (qflag == 0) { 421 va_start(ap, fmt); 422 vwarnx(fmt, ap); 423 va_end(ap); 424 } 425 exit(2); 426 } 427 #endif 428 429 #ifndef SMALL 430 /* split up $GZIP and prepend it to the argument list */ 431 static void 432 prepend_gzip(char *gzip, int *argc, char ***argv) 433 { 434 char *s, **nargv, **ac; 435 int nenvarg = 0, i; 436 437 /* scan how many arguments there are */ 438 for (s = gzip;;) { 439 while (*s == ' ' || *s == '\t') 440 s++; 441 if (*s == 0) 442 goto count_done; 443 nenvarg++; 444 while (*s != ' ' && *s != '\t') 445 if (*s++ == 0) 446 goto count_done; 447 } 448 count_done: 449 /* punt early */ 450 if (nenvarg == 0) 451 return; 452 453 *argc += nenvarg; 454 ac = *argv; 455 456 nargv = (char **)malloc((*argc + 1) * sizeof(char *)); 457 if (nargv == NULL) 458 maybe_err("malloc"); 459 460 /* stash this away */ 461 *argv = nargv; 462 463 /* copy the program name first */ 464 i = 0; 465 nargv[i++] = *(ac++); 466 467 /* take a copy of $GZIP and add it to the array */ 468 s = strdup(gzip); 469 if (s == NULL) 470 maybe_err("strdup"); 471 for (;;) { 472 /* Skip whitespaces. */ 473 while (*s == ' ' || *s == '\t') 474 s++; 475 if (*s == 0) 476 goto copy_done; 477 nargv[i++] = s; 478 /* Find the end of this argument. */ 479 while (*s != ' ' && *s != '\t') 480 if (*s++ == 0) 481 /* Argument followed by NUL. */ 482 goto copy_done; 483 /* Terminate by overwriting ' ' or '\t' with NUL. */ 484 *s++ = 0; 485 } 486 copy_done: 487 488 /* copy the original arguments and a NULL */ 489 while (*ac) 490 nargv[i++] = *(ac++); 491 nargv[i] = NULL; 492 } 493 #endif 494 495 /* compress input to output. Return bytes read, -1 on error */ 496 static off_t 497 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime) 498 { 499 z_stream z; 500 char *outbufp, *inbufp; 501 off_t in_tot = 0, out_tot = 0; 502 ssize_t in_size; 503 int i, error; 504 uLong crc; 505 #ifdef SMALL 506 static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0, 507 0, 0, 0, 0, 508 0, OS_CODE }; 509 #endif 510 511 outbufp = malloc(BUFLEN); 512 inbufp = malloc(BUFLEN); 513 if (outbufp == NULL || inbufp == NULL) { 514 maybe_err("malloc failed"); 515 goto out; 516 } 517 518 memset(&z, 0, sizeof z); 519 z.zalloc = Z_NULL; 520 z.zfree = Z_NULL; 521 z.opaque = 0; 522 523 #ifdef SMALL 524 memcpy(outbufp, header, sizeof header); 525 i = sizeof header; 526 #else 527 if (nflag != 0) { 528 mtime = 0; 529 origname = ""; 530 } 531 532 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s", 533 GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 534 *origname ? ORIG_NAME : 0, 535 mtime & 0xff, 536 (mtime >> 8) & 0xff, 537 (mtime >> 16) & 0xff, 538 (mtime >> 24) & 0xff, 539 numflag == 1 ? 4 : numflag == 9 ? 2 : 0, 540 OS_CODE, origname); 541 if (i >= BUFLEN) 542 /* this need PATH_MAX > BUFLEN ... */ 543 maybe_err("snprintf"); 544 if (*origname) 545 i++; 546 #endif 547 548 z.next_out = outbufp + i; 549 z.avail_out = BUFLEN - i; 550 551 error = deflateInit2(&z, numflag, Z_DEFLATED, 552 (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY); 553 if (error != Z_OK) { 554 maybe_warnx("deflateInit2 failed"); 555 in_tot = -1; 556 goto out; 557 } 558 559 crc = crc32(0L, Z_NULL, 0); 560 for (;;) { 561 if (z.avail_out == 0) { 562 if (write(out, outbufp, BUFLEN) != BUFLEN) { 563 maybe_warn("write"); 564 in_tot = -1; 565 goto out; 566 } 567 568 out_tot += BUFLEN; 569 z.next_out = outbufp; 570 z.avail_out = BUFLEN; 571 } 572 573 if (z.avail_in == 0) { 574 in_size = read(in, inbufp, BUFLEN); 575 if (in_size < 0) { 576 maybe_warn("read"); 577 in_tot = -1; 578 goto out; 579 } 580 if (in_size == 0) 581 break; 582 583 crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size); 584 in_tot += in_size; 585 z.next_in = inbufp; 586 z.avail_in = in_size; 587 } 588 589 error = deflate(&z, Z_NO_FLUSH); 590 if (error != Z_OK && error != Z_STREAM_END) { 591 maybe_warnx("deflate failed"); 592 in_tot = -1; 593 goto out; 594 } 595 } 596 597 /* clean up */ 598 for (;;) { 599 size_t len; 600 ssize_t w; 601 602 error = deflate(&z, Z_FINISH); 603 if (error != Z_OK && error != Z_STREAM_END) { 604 maybe_warnx("deflate failed"); 605 in_tot = -1; 606 goto out; 607 } 608 609 len = (char *)z.next_out - outbufp; 610 611 w = write(out, outbufp, len); 612 if (w == -1 || (size_t)w != len) { 613 maybe_warn("write"); 614 out_tot = -1; 615 goto out; 616 } 617 out_tot += len; 618 z.next_out = outbufp; 619 z.avail_out = BUFLEN; 620 621 if (error == Z_STREAM_END) 622 break; 623 } 624 625 if (deflateEnd(&z) != Z_OK) { 626 maybe_warnx("deflateEnd failed"); 627 in_tot = -1; 628 goto out; 629 } 630 631 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c", 632 (int)crc & 0xff, 633 (int)(crc >> 8) & 0xff, 634 (int)(crc >> 16) & 0xff, 635 (int)(crc >> 24) & 0xff, 636 (int)in_tot & 0xff, 637 (int)(in_tot >> 8) & 0xff, 638 (int)(in_tot >> 16) & 0xff, 639 (int)(in_tot >> 24) & 0xff); 640 if (i != 8) 641 maybe_err("snprintf"); 642 #if 0 643 if (in_tot > 0xffffffff) 644 maybe_warn("input file size >= 4GB cannot be saved"); 645 #endif 646 if (write(out, outbufp, i) != i) { 647 maybe_warn("write"); 648 in_tot = -1; 649 } else 650 out_tot += i; 651 652 out: 653 if (inbufp != NULL) 654 free(inbufp); 655 if (outbufp != NULL) 656 free(outbufp); 657 if (gsizep) 658 *gsizep = out_tot; 659 return in_tot; 660 } 661 662 /* 663 * uncompress input to output then close the input. return the 664 * uncompressed size written, and put the compressed sized read 665 * into `*gsizep'. 666 */ 667 static off_t 668 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep, 669 const char *filename) 670 { 671 z_stream z; 672 char *outbufp, *inbufp; 673 off_t out_tot = -1, in_tot = 0; 674 uint32_t out_sub_tot = 0; 675 enum { 676 GZSTATE_MAGIC0, 677 GZSTATE_MAGIC1, 678 GZSTATE_METHOD, 679 GZSTATE_FLAGS, 680 GZSTATE_SKIPPING, 681 GZSTATE_EXTRA, 682 GZSTATE_EXTRA2, 683 GZSTATE_EXTRA3, 684 GZSTATE_ORIGNAME, 685 GZSTATE_COMMENT, 686 GZSTATE_HEAD_CRC1, 687 GZSTATE_HEAD_CRC2, 688 GZSTATE_INIT, 689 GZSTATE_READ, 690 GZSTATE_CRC, 691 GZSTATE_LEN, 692 } state = GZSTATE_MAGIC0; 693 int flags = 0, skip_count = 0; 694 int error = Z_STREAM_ERROR, done_reading = 0; 695 uLong crc = 0; 696 ssize_t wr; 697 int needmore = 0; 698 699 #define ADVANCE() { z.next_in++; z.avail_in--; } 700 701 if ((outbufp = malloc(BUFLEN)) == NULL) { 702 maybe_err("malloc failed"); 703 goto out2; 704 } 705 if ((inbufp = malloc(BUFLEN)) == NULL) { 706 maybe_err("malloc failed"); 707 goto out1; 708 } 709 710 memset(&z, 0, sizeof z); 711 z.avail_in = prelen; 712 z.next_in = pre; 713 z.avail_out = BUFLEN; 714 z.next_out = outbufp; 715 z.zalloc = NULL; 716 z.zfree = NULL; 717 z.opaque = 0; 718 719 in_tot = prelen; 720 out_tot = 0; 721 722 for (;;) { 723 if ((z.avail_in == 0 || needmore) && done_reading == 0) { 724 ssize_t in_size; 725 726 if (z.avail_in > 0) { 727 memmove(inbufp, z.next_in, z.avail_in); 728 } 729 z.next_in = inbufp; 730 in_size = read(in, z.next_in + z.avail_in, 731 BUFLEN - z.avail_in); 732 733 if (in_size == -1) { 734 maybe_warn("failed to read stdin"); 735 goto stop_and_fail; 736 } else if (in_size == 0) { 737 done_reading = 1; 738 } 739 740 z.avail_in += in_size; 741 needmore = 0; 742 743 in_tot += in_size; 744 } 745 if (z.avail_in == 0) { 746 if (done_reading && state != GZSTATE_MAGIC0) { 747 maybe_warnx("%s: unexpected end of file", 748 filename); 749 goto stop_and_fail; 750 } 751 goto stop; 752 } 753 switch (state) { 754 case GZSTATE_MAGIC0: 755 if (*z.next_in != GZIP_MAGIC0) { 756 if (in_tot > 0) { 757 maybe_warnx("%s: trailing garbage ignored", filename); 758 goto stop; 759 } 760 maybe_warnx("input not gziped (MAGIC0)"); 761 goto stop_and_fail; 762 } 763 ADVANCE(); 764 state++; 765 out_sub_tot = 0; 766 crc = crc32(0L, Z_NULL, 0); 767 break; 768 769 case GZSTATE_MAGIC1: 770 if (*z.next_in != GZIP_MAGIC1 && 771 *z.next_in != GZIP_OMAGIC1) { 772 maybe_warnx("input not gziped (MAGIC1)"); 773 goto stop_and_fail; 774 } 775 ADVANCE(); 776 state++; 777 break; 778 779 case GZSTATE_METHOD: 780 if (*z.next_in != Z_DEFLATED) { 781 maybe_warnx("unknown compression method"); 782 goto stop_and_fail; 783 } 784 ADVANCE(); 785 state++; 786 break; 787 788 case GZSTATE_FLAGS: 789 flags = *z.next_in; 790 ADVANCE(); 791 skip_count = 6; 792 state++; 793 break; 794 795 case GZSTATE_SKIPPING: 796 if (skip_count > 0) { 797 skip_count--; 798 ADVANCE(); 799 } else 800 state++; 801 break; 802 803 case GZSTATE_EXTRA: 804 if ((flags & EXTRA_FIELD) == 0) { 805 state = GZSTATE_ORIGNAME; 806 break; 807 } 808 skip_count = *z.next_in; 809 ADVANCE(); 810 state++; 811 break; 812 813 case GZSTATE_EXTRA2: 814 skip_count |= ((*z.next_in) << 8); 815 ADVANCE(); 816 state++; 817 break; 818 819 case GZSTATE_EXTRA3: 820 if (skip_count > 0) { 821 skip_count--; 822 ADVANCE(); 823 } else 824 state++; 825 break; 826 827 case GZSTATE_ORIGNAME: 828 if ((flags & ORIG_NAME) == 0) { 829 state++; 830 break; 831 } 832 if (*z.next_in == 0) 833 state++; 834 ADVANCE(); 835 break; 836 837 case GZSTATE_COMMENT: 838 if ((flags & COMMENT) == 0) { 839 state++; 840 break; 841 } 842 if (*z.next_in == 0) 843 state++; 844 ADVANCE(); 845 break; 846 847 case GZSTATE_HEAD_CRC1: 848 if (flags & HEAD_CRC) 849 skip_count = 2; 850 else 851 skip_count = 0; 852 state++; 853 break; 854 855 case GZSTATE_HEAD_CRC2: 856 if (skip_count > 0) { 857 skip_count--; 858 ADVANCE(); 859 } else 860 state++; 861 break; 862 863 case GZSTATE_INIT: 864 if (inflateInit2(&z, -MAX_WBITS) != Z_OK) { 865 maybe_warnx("failed to inflateInit"); 866 goto stop_and_fail; 867 } 868 state++; 869 break; 870 871 case GZSTATE_READ: 872 error = inflate(&z, Z_FINISH); 873 switch (error) { 874 /* Z_BUF_ERROR goes with Z_FINISH... */ 875 case Z_BUF_ERROR: 876 case Z_STREAM_END: 877 case Z_OK: 878 break; 879 880 case Z_NEED_DICT: 881 maybe_warnx("Z_NEED_DICT error"); 882 goto stop_and_fail; 883 case Z_DATA_ERROR: 884 maybe_warnx("data stream error"); 885 goto stop_and_fail; 886 case Z_STREAM_ERROR: 887 maybe_warnx("internal stream error"); 888 goto stop_and_fail; 889 case Z_MEM_ERROR: 890 maybe_warnx("memory allocation error"); 891 goto stop_and_fail; 892 893 default: 894 maybe_warn("unknown error from inflate(): %d", 895 error); 896 } 897 wr = BUFLEN - z.avail_out; 898 899 if (wr != 0) { 900 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr); 901 if ( 902 #ifndef SMALL 903 /* don't write anything with -t */ 904 tflag == 0 && 905 #endif 906 write(out, outbufp, wr) != wr) { 907 maybe_warn("error writing to output"); 908 goto stop_and_fail; 909 } 910 911 out_tot += wr; 912 out_sub_tot += wr; 913 } 914 915 if (error == Z_STREAM_END) { 916 inflateEnd(&z); 917 state++; 918 } 919 920 z.next_out = outbufp; 921 z.avail_out = BUFLEN; 922 923 break; 924 case GZSTATE_CRC: 925 { 926 uLong origcrc; 927 928 if (z.avail_in < 4) { 929 if (!done_reading) { 930 needmore = 1; 931 continue; 932 } 933 maybe_warnx("truncated input"); 934 goto stop_and_fail; 935 } 936 origcrc = ((unsigned)z.next_in[0] & 0xff) | 937 ((unsigned)z.next_in[1] & 0xff) << 8 | 938 ((unsigned)z.next_in[2] & 0xff) << 16 | 939 ((unsigned)z.next_in[3] & 0xff) << 24; 940 if (origcrc != crc) { 941 maybe_warnx("invalid compressed" 942 " data--crc error"); 943 goto stop_and_fail; 944 } 945 } 946 947 z.avail_in -= 4; 948 z.next_in += 4; 949 950 if (!z.avail_in && done_reading) { 951 goto stop; 952 } 953 state++; 954 break; 955 case GZSTATE_LEN: 956 { 957 uLong origlen; 958 959 if (z.avail_in < 4) { 960 if (!done_reading) { 961 needmore = 1; 962 continue; 963 } 964 maybe_warnx("truncated input"); 965 goto stop_and_fail; 966 } 967 origlen = ((unsigned)z.next_in[0] & 0xff) | 968 ((unsigned)z.next_in[1] & 0xff) << 8 | 969 ((unsigned)z.next_in[2] & 0xff) << 16 | 970 ((unsigned)z.next_in[3] & 0xff) << 24; 971 972 if (origlen != out_sub_tot) { 973 maybe_warnx("invalid compressed" 974 " data--length error"); 975 goto stop_and_fail; 976 } 977 } 978 979 z.avail_in -= 4; 980 z.next_in += 4; 981 982 if (error < 0) { 983 maybe_warnx("decompression error"); 984 goto stop_and_fail; 985 } 986 state = GZSTATE_MAGIC0; 987 break; 988 } 989 continue; 990 stop_and_fail: 991 out_tot = -1; 992 stop: 993 break; 994 } 995 if (state > GZSTATE_INIT) 996 inflateEnd(&z); 997 998 free(inbufp); 999 out1: 1000 free(outbufp); 1001 out2: 1002 if (gsizep) 1003 *gsizep = in_tot; 1004 return (out_tot); 1005 } 1006 1007 #ifndef SMALL 1008 /* 1009 * set the owner, mode, flags & utimes using the given file descriptor. 1010 * file is only used in possible warning messages. 1011 */ 1012 static void 1013 copymodes(int fd, const struct stat *sbp, const char *file) 1014 { 1015 struct timeval times[2]; 1016 struct stat sb; 1017 1018 /* 1019 * If we have no info on the input, give this file some 1020 * default values and return.. 1021 */ 1022 if (sbp == NULL) { 1023 mode_t mask = umask(022); 1024 1025 (void)fchmod(fd, DEFFILEMODE & ~mask); 1026 (void)umask(mask); 1027 return; 1028 } 1029 sb = *sbp; 1030 1031 /* if the chown fails, remove set-id bits as-per compress(1) */ 1032 if (fchown(fd, sb.st_uid, sb.st_gid) < 0) { 1033 if (errno != EPERM) 1034 maybe_warn("couldn't fchown: %s", file); 1035 sb.st_mode &= ~(S_ISUID|S_ISGID); 1036 } 1037 1038 /* we only allow set-id and the 9 normal permission bits */ 1039 sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 1040 if (fchmod(fd, sb.st_mode) < 0) 1041 maybe_warn("couldn't fchmod: %s", file); 1042 1043 /* only try flags if they exist already */ 1044 if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0) 1045 maybe_warn("couldn't fchflags: %s", file); 1046 1047 TIMESPEC_TO_TIMEVAL(×[0], &sb.st_atimespec); 1048 TIMESPEC_TO_TIMEVAL(×[1], &sb.st_mtimespec); 1049 if (futimes(fd, times) < 0) 1050 maybe_warn("couldn't utimes: %s", file); 1051 } 1052 #endif 1053 1054 /* what sort of file is this? */ 1055 static enum filetype 1056 file_gettype(u_char *buf) 1057 { 1058 1059 if (buf[0] == GZIP_MAGIC0 && 1060 (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1)) 1061 return FT_GZIP; 1062 else 1063 #ifndef NO_BZIP2_SUPPORT 1064 if (memcmp(buf, BZIP2_MAGIC, 3) == 0 && 1065 buf[3] >= '0' && buf[3] <= '9') 1066 return FT_BZIP2; 1067 else 1068 #endif 1069 #ifndef NO_COMPRESS_SUPPORT 1070 if (memcmp(buf, Z_MAGIC, 2) == 0) 1071 return FT_Z; 1072 else 1073 #endif 1074 return FT_UNKNOWN; 1075 } 1076 1077 #ifndef SMALL 1078 /* check the outfile is OK. */ 1079 static int 1080 check_outfile(const char *outfile) 1081 { 1082 struct stat sb; 1083 int ok = 1; 1084 1085 if (lflag == 0 && stat(outfile, &sb) == 0) { 1086 if (fflag) 1087 unlink(outfile); 1088 else if (isatty(STDIN_FILENO)) { 1089 char ans[10] = { 'n', '\0' }; /* default */ 1090 1091 fprintf(stderr, "%s already exists -- do you wish to " 1092 "overwrite (y or n)? " , outfile); 1093 (void)fgets(ans, sizeof(ans) - 1, stdin); 1094 if (ans[0] != 'y' && ans[0] != 'Y') { 1095 fprintf(stderr, "\tnot overwritting\n"); 1096 ok = 0; 1097 } else 1098 unlink(outfile); 1099 } else { 1100 maybe_warnx("%s already exists -- skipping", outfile); 1101 ok = 0; 1102 } 1103 } 1104 return ok; 1105 } 1106 1107 static void 1108 unlink_input(const char *file, const struct stat *sb) 1109 { 1110 struct stat nsb; 1111 1112 if (stat(file, &nsb) != 0) 1113 /* Must be gone alrady */ 1114 return; 1115 if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino) 1116 /* Definitely a different file */ 1117 return; 1118 unlink(file); 1119 } 1120 #endif 1121 1122 static const suffixes_t * 1123 check_suffix(char *file, int xlate) 1124 { 1125 const suffixes_t *s; 1126 int len = strlen(file); 1127 char *sp; 1128 1129 for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) { 1130 /* if it doesn't fit in "a.suf", don't bother */ 1131 if (s->ziplen >= len) 1132 continue; 1133 sp = file + len - s->ziplen; 1134 if (strcmp(s->zipped, sp) != 0) 1135 continue; 1136 if (xlate) 1137 strcpy(sp, s->normal); 1138 return s; 1139 } 1140 return NULL; 1141 } 1142 1143 /* 1144 * compress the given file: create a corresponding .gz file and remove the 1145 * original. 1146 */ 1147 static off_t 1148 file_compress(char *file, char *outfile, size_t outsize) 1149 { 1150 int in; 1151 int out; 1152 off_t size, insize; 1153 #ifndef SMALL 1154 struct stat isb, osb; 1155 const suffixes_t *suff; 1156 #endif 1157 1158 in = open(file, O_RDONLY); 1159 if (in == -1) { 1160 maybe_warn("can't open %s", file); 1161 return -1; 1162 } 1163 1164 if (cflag == 0) { 1165 #ifndef SMALL 1166 if (fstat(in, &isb) == 0) { 1167 if (isb.st_nlink > 1 && fflag == 0) { 1168 maybe_warnx("%s has %d other link%s -- " 1169 "skipping", file, isb.st_nlink - 1, 1170 isb.st_nlink == 1 ? "" : "s"); 1171 close(in); 1172 return -1; 1173 } 1174 } 1175 1176 if (fflag == 0 && (suff = check_suffix(file, 0)) 1177 && suff->zipped[0] != 0) { 1178 maybe_warnx("%s already has %s suffix -- unchanged", 1179 file, suff->zipped); 1180 close(in); 1181 return -1; 1182 } 1183 #endif 1184 1185 /* Add (usually) .gz to filename */ 1186 if ((size_t)snprintf(outfile, outsize, "%s%s", 1187 file, suffixes[0].zipped) >= outsize) 1188 memcpy(outfile - suffixes[0].ziplen - 1, 1189 suffixes[0].zipped, suffixes[0].ziplen + 1); 1190 1191 #ifndef SMALL 1192 if (check_outfile(outfile) == 0) { 1193 close(in); 1194 return -1; 1195 } 1196 #endif 1197 } 1198 1199 if (cflag == 0) { 1200 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600); 1201 if (out == -1) { 1202 maybe_warn("could not create output: %s", outfile); 1203 fclose(stdin); 1204 return -1; 1205 } 1206 } else 1207 out = STDOUT_FILENO; 1208 1209 insize = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime); 1210 1211 (void)close(in); 1212 1213 /* 1214 * If there was an error, insize will be -1. 1215 * If we compressed to stdout, just return the size. 1216 * Otherwise stat the file and check it is the correct size. 1217 * We only blow away the file if we can stat the output and it 1218 * has the expected size. 1219 */ 1220 if (cflag != 0) 1221 return insize == -1 ? -1 : size; 1222 1223 #ifndef SMALL 1224 if (fstat(out, &osb) != 0) { 1225 maybe_warn("couldn't stat: %s", outfile); 1226 goto bad_outfile; 1227 } 1228 1229 if (osb.st_size != size) { 1230 maybe_warnx("output file: %s wrong size (%" PRIdOFF 1231 " != %" PRIdOFF "), deleting", 1232 outfile, osb.st_size, size); 1233 goto bad_outfile; 1234 } 1235 1236 copymodes(out, &isb, outfile); 1237 #endif 1238 if (close(out) == -1) 1239 maybe_warn("couldn't close output"); 1240 1241 /* output is good, ok to delete input */ 1242 unlink_input(file, &isb); 1243 return size; 1244 1245 #ifndef SMALL 1246 bad_outfile: 1247 if (close(out) == -1) 1248 maybe_warn("couldn't close output"); 1249 1250 maybe_warnx("leaving original %s", file); 1251 unlink(outfile); 1252 return size; 1253 #endif 1254 } 1255 1256 /* uncompress the given file and remove the original */ 1257 static off_t 1258 file_uncompress(char *file, char *outfile, size_t outsize) 1259 { 1260 struct stat isb, osb; 1261 off_t size; 1262 ssize_t rbytes; 1263 unsigned char header1[4]; 1264 enum filetype method; 1265 int rv, fd, ofd, zfd = -1; 1266 #ifndef SMALL 1267 time_t timestamp = 0; 1268 unsigned char name[PATH_MAX + 1]; 1269 #endif 1270 1271 /* gather the old name info */ 1272 1273 fd = open(file, O_RDONLY); 1274 if (fd < 0) { 1275 maybe_warn("can't open %s", file); 1276 goto lose; 1277 } 1278 1279 strlcpy(outfile, file, outsize); 1280 if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) { 1281 maybe_warnx("%s: unknown suffix -- ignored", file); 1282 goto lose; 1283 } 1284 1285 rbytes = read(fd, header1, sizeof header1); 1286 if (rbytes != sizeof header1) { 1287 /* we don't want to fail here. */ 1288 #ifndef SMALL 1289 if (fflag) 1290 goto lose; 1291 #endif 1292 if (rbytes == -1) 1293 maybe_warn("can't read %s", file); 1294 else 1295 goto unexpected_EOF; 1296 goto lose; 1297 } 1298 1299 method = file_gettype(header1); 1300 1301 #ifndef SMALL 1302 if (fflag == 0 && method == FT_UNKNOWN) { 1303 maybe_warnx("%s: not in gzip format", file); 1304 goto lose; 1305 } 1306 1307 #endif 1308 1309 #ifndef SMALL 1310 if (method == FT_GZIP && Nflag) { 1311 unsigned char ts[4]; /* timestamp */ 1312 1313 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP); 1314 if (rv >= 0 && rv < sizeof ts) 1315 goto unexpected_EOF; 1316 if (rv == -1) { 1317 if (!fflag) 1318 maybe_warn("can't read %s", file); 1319 goto lose; 1320 } 1321 timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0]; 1322 1323 if (header1[3] & ORIG_NAME) { 1324 rbytes = pread(fd, name, sizeof name, GZIP_ORIGNAME); 1325 if (rbytes < 0) { 1326 maybe_warn("can't read %s", file); 1327 goto lose; 1328 } 1329 if (name[0] != 0) { 1330 /* preserve original directory name */ 1331 char *dp = strrchr(file, '/'); 1332 if (dp == NULL) 1333 dp = file; 1334 else 1335 dp++; 1336 snprintf(outfile, outsize, "%.*s%.*s", 1337 (int) (dp - file), 1338 file, (int) rbytes, name); 1339 } 1340 } 1341 } 1342 #endif 1343 lseek(fd, 0, SEEK_SET); 1344 1345 if (cflag == 0 || lflag) { 1346 if (fstat(fd, &isb) != 0) 1347 goto lose; 1348 #ifndef SMALL 1349 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) { 1350 maybe_warnx("%s has %d other links -- skipping", 1351 file, isb.st_nlink - 1); 1352 goto lose; 1353 } 1354 if (nflag == 0 && timestamp) 1355 isb.st_mtime = timestamp; 1356 if (check_outfile(outfile) == 0) 1357 goto lose; 1358 #endif 1359 } 1360 1361 if (cflag == 0 && lflag == 0) { 1362 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600); 1363 if (zfd == STDOUT_FILENO) { 1364 /* We won't close STDOUT_FILENO later... */ 1365 zfd = dup(zfd); 1366 close(STDOUT_FILENO); 1367 } 1368 if (zfd == -1) { 1369 maybe_warn("can't open %s", outfile); 1370 goto lose; 1371 } 1372 } else 1373 zfd = STDOUT_FILENO; 1374 1375 #ifndef NO_BZIP2_SUPPORT 1376 if (method == FT_BZIP2) { 1377 1378 /* XXX */ 1379 if (lflag) { 1380 maybe_warnx("no -l with bzip2 files"); 1381 goto lose; 1382 } 1383 1384 size = unbzip2(fd, zfd, NULL, 0, NULL); 1385 } else 1386 #endif 1387 1388 #ifndef NO_COMPRESS_SUPPORT 1389 if (method == FT_Z) { 1390 FILE *in, *out; 1391 1392 /* XXX */ 1393 if (lflag) { 1394 maybe_warnx("no -l with Lempel-Ziv files"); 1395 goto lose; 1396 } 1397 1398 if ((in = zdopen(fd)) == NULL) { 1399 maybe_warn("zdopen for read: %s", file); 1400 goto lose; 1401 } 1402 1403 out = fdopen(dup(zfd), "w"); 1404 if (out == NULL) { 1405 maybe_warn("fdopen for write: %s", outfile); 1406 fclose(in); 1407 goto lose; 1408 } 1409 1410 size = zuncompress(in, out, NULL, 0, NULL); 1411 /* need to fclose() if ferror() is true... */ 1412 if (ferror(in) | fclose(in)) { 1413 maybe_warn("failed infile fclose"); 1414 unlink(outfile); 1415 (void)fclose(out); 1416 } 1417 if (fclose(out) != 0) { 1418 maybe_warn("failed outfile fclose"); 1419 unlink(outfile); 1420 goto lose; 1421 } 1422 } else 1423 #endif 1424 1425 #ifndef SMALL 1426 if (method == FT_UNKNOWN) { 1427 if (lflag) { 1428 maybe_warnx("no -l for unknown filetypes"); 1429 goto lose; 1430 } 1431 size = cat_fd(NULL, 0, NULL, fd); 1432 } else 1433 #endif 1434 { 1435 if (lflag) { 1436 print_list(fd, isb.st_size, outfile, isb.st_mtime); 1437 close(fd); 1438 return -1; /* XXX */ 1439 } 1440 1441 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file); 1442 } 1443 1444 if (close(fd) != 0) 1445 maybe_warn("couldn't close input"); 1446 if (zfd != STDOUT_FILENO && close(zfd) != 0) 1447 maybe_warn("couldn't close output"); 1448 1449 if (size == -1) { 1450 if (cflag == 0) 1451 unlink(outfile); 1452 maybe_warnx("%s: uncompress failed", file); 1453 return -1; 1454 } 1455 1456 /* if testing, or we uncompressed to stdout, this is all we need */ 1457 #ifndef SMALL 1458 if (tflag) 1459 return size; 1460 #endif 1461 /* if we are uncompressing to stdin, don't remove the file. */ 1462 if (cflag) 1463 return size; 1464 1465 /* 1466 * if we create a file... 1467 */ 1468 /* 1469 * if we can't stat the file don't remove the file. 1470 */ 1471 1472 ofd = open(outfile, O_RDWR, 0); 1473 if (ofd == -1) { 1474 maybe_warn("couldn't open (leaving original): %s", 1475 outfile); 1476 return -1; 1477 } 1478 if (fstat(ofd, &osb) != 0) { 1479 maybe_warn("couldn't stat (leaving original): %s", 1480 outfile); 1481 close(ofd); 1482 return -1; 1483 } 1484 if (osb.st_size != size) { 1485 maybe_warnx("stat gave different size: %" PRIdOFF 1486 " != %" PRIdOFF " (leaving original)", 1487 size, osb.st_size); 1488 close(ofd); 1489 unlink(outfile); 1490 return -1; 1491 } 1492 unlink_input(file, &isb); 1493 #ifndef SMALL 1494 copymodes(ofd, &isb, outfile); 1495 #endif 1496 close(ofd); 1497 return size; 1498 1499 unexpected_EOF: 1500 maybe_warnx("%s: unexpected end of file", file); 1501 lose: 1502 if (fd != -1) 1503 close(fd); 1504 if (zfd != -1 && zfd != STDOUT_FILENO) 1505 close(fd); 1506 return -1; 1507 } 1508 1509 #ifndef SMALL 1510 static off_t 1511 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd) 1512 { 1513 char buf[BUFLEN]; 1514 off_t in_tot; 1515 ssize_t w; 1516 1517 in_tot = count; 1518 w = write(STDOUT_FILENO, prepend, count); 1519 if (w == -1 || (size_t)w != count) { 1520 maybe_warn("write to stdout"); 1521 return -1; 1522 } 1523 for (;;) { 1524 ssize_t rv; 1525 1526 rv = read(fd, buf, sizeof buf); 1527 if (rv == 0) 1528 break; 1529 if (rv < 0) { 1530 maybe_warn("read from fd %d", fd); 1531 break; 1532 } 1533 1534 if (write(STDOUT_FILENO, buf, rv) != rv) { 1535 maybe_warn("write to stdout"); 1536 break; 1537 } 1538 in_tot += rv; 1539 } 1540 1541 if (gsizep) 1542 *gsizep = in_tot; 1543 return (in_tot); 1544 } 1545 #endif 1546 1547 static void 1548 handle_stdin(void) 1549 { 1550 unsigned char header1[4]; 1551 off_t usize, gsize; 1552 enum filetype method; 1553 ssize_t bytes_read; 1554 #ifndef NO_COMPRESS_SUPPORT 1555 FILE *in; 1556 #endif 1557 1558 #ifndef SMALL 1559 if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) { 1560 maybe_warnx("standard input is a terminal -- ignoring"); 1561 return; 1562 } 1563 #endif 1564 1565 if (lflag) { 1566 struct stat isb; 1567 1568 /* XXX could read the whole file, etc. */ 1569 if (fstat(STDIN_FILENO, &isb) < 0) { 1570 maybe_warn("fstat"); 1571 return; 1572 } 1573 print_list(STDIN_FILENO, isb.st_size, "stdout", isb.st_mtime); 1574 return; 1575 } 1576 1577 bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1); 1578 if (bytes_read == -1) { 1579 maybe_warn("can't read stdin"); 1580 return; 1581 } else if (bytes_read != sizeof(header1)) { 1582 maybe_warnx("(stdin): unexpected end of file"); 1583 return; 1584 } 1585 1586 method = file_gettype(header1); 1587 switch (method) { 1588 default: 1589 #ifndef SMALL 1590 if (fflag == 0) { 1591 maybe_warnx("unknown compression format"); 1592 return; 1593 } 1594 usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO); 1595 break; 1596 #endif 1597 case FT_GZIP: 1598 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO, 1599 header1, sizeof header1, &gsize, "(stdin)"); 1600 break; 1601 #ifndef NO_BZIP2_SUPPORT 1602 case FT_BZIP2: 1603 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO, 1604 header1, sizeof header1, &gsize); 1605 break; 1606 #endif 1607 #ifndef NO_COMPRESS_SUPPORT 1608 case FT_Z: 1609 if ((in = zdopen(STDIN_FILENO)) == NULL) { 1610 maybe_warnx("zopen of stdin"); 1611 return; 1612 } 1613 1614 usize = zuncompress(in, stdout, header1, sizeof header1, &gsize); 1615 fclose(in); 1616 break; 1617 #endif 1618 } 1619 1620 #ifndef SMALL 1621 if (vflag && !tflag && usize != -1 && gsize != -1) 1622 print_verbage(NULL, NULL, usize, gsize); 1623 if (vflag && tflag) 1624 print_test("(stdin)", usize != -1); 1625 #endif 1626 1627 } 1628 1629 static void 1630 handle_stdout(void) 1631 { 1632 off_t gsize, usize; 1633 struct stat sb; 1634 time_t systime; 1635 uint32_t mtime; 1636 int ret; 1637 1638 #ifndef SMALL 1639 if (fflag == 0 && isatty(STDOUT_FILENO)) { 1640 maybe_warnx("standard output is a terminal -- ignoring"); 1641 return; 1642 } 1643 #endif 1644 /* If stdin is a file use it's mtime, otherwise use current time */ 1645 ret = fstat(STDIN_FILENO, &sb); 1646 1647 #ifndef SMALL 1648 if (ret < 0) { 1649 maybe_warn("Can't stat stdin"); 1650 return; 1651 } 1652 #endif 1653 1654 if (S_ISREG(sb.st_mode)) 1655 mtime = (uint32_t)sb.st_mtime; 1656 else { 1657 systime = time(NULL); 1658 #ifndef SMALL 1659 if (systime == -1) { 1660 maybe_warn("time"); 1661 return; 1662 } 1663 #endif 1664 mtime = (uint32_t)systime; 1665 } 1666 1667 usize = gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime); 1668 #ifndef SMALL 1669 if (vflag && !tflag && usize != -1 && gsize != -1) 1670 print_verbage(NULL, NULL, usize, gsize); 1671 #endif 1672 } 1673 1674 /* do what is asked for, for the path name */ 1675 static void 1676 handle_pathname(char *path) 1677 { 1678 char *opath = path, *s = NULL; 1679 ssize_t len; 1680 int slen; 1681 struct stat sb; 1682 1683 /* check for stdout/stdin */ 1684 if (path[0] == '-' && path[1] == '\0') { 1685 if (dflag) 1686 handle_stdin(); 1687 else 1688 handle_stdout(); 1689 return; 1690 } 1691 1692 retry: 1693 if (stat(path, &sb) != 0) { 1694 /* lets try <path>.gz if we're decompressing */ 1695 if (dflag && s == NULL && errno == ENOENT) { 1696 len = strlen(path); 1697 slen = suffixes[0].ziplen; 1698 s = malloc(len + slen + 1); 1699 if (s == NULL) 1700 maybe_err("malloc"); 1701 memcpy(s, path, len); 1702 memcpy(s + len, suffixes[0].zipped, slen + 1); 1703 path = s; 1704 goto retry; 1705 } 1706 maybe_warn("can't stat: %s", opath); 1707 goto out; 1708 } 1709 1710 if (S_ISDIR(sb.st_mode)) { 1711 #ifndef SMALL 1712 if (rflag) 1713 handle_dir(path); 1714 else 1715 #endif 1716 maybe_warnx("%s is a directory", path); 1717 goto out; 1718 } 1719 1720 if (S_ISREG(sb.st_mode)) 1721 handle_file(path, &sb); 1722 else 1723 maybe_warnx("%s is not a regular file", path); 1724 1725 out: 1726 if (s) 1727 free(s); 1728 } 1729 1730 /* compress/decompress a file */ 1731 static void 1732 handle_file(char *file, struct stat *sbp) 1733 { 1734 off_t usize, gsize; 1735 char outfile[PATH_MAX]; 1736 1737 infile = file; 1738 if (dflag) { 1739 usize = file_uncompress(file, outfile, sizeof(outfile)); 1740 #ifndef SMALL 1741 if (vflag && tflag) 1742 print_test(file, usize != -1); 1743 #endif 1744 if (usize == -1) 1745 return; 1746 gsize = sbp->st_size; 1747 } else { 1748 gsize = file_compress(file, outfile, sizeof(outfile)); 1749 if (gsize == -1) 1750 return; 1751 usize = sbp->st_size; 1752 } 1753 1754 1755 #ifndef SMALL 1756 if (vflag && !tflag) 1757 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize); 1758 #endif 1759 } 1760 1761 #ifndef SMALL 1762 /* this is used with -r to recursively descend directories */ 1763 static void 1764 handle_dir(char *dir) 1765 { 1766 char *path_argv[2]; 1767 FTS *fts; 1768 FTSENT *entry; 1769 1770 path_argv[0] = dir; 1771 path_argv[1] = 0; 1772 fts = fts_open(path_argv, FTS_PHYSICAL, NULL); 1773 if (fts == NULL) { 1774 warn("couldn't fts_open %s", dir); 1775 return; 1776 } 1777 1778 while ((entry = fts_read(fts))) { 1779 switch(entry->fts_info) { 1780 case FTS_D: 1781 case FTS_DP: 1782 continue; 1783 1784 case FTS_DNR: 1785 case FTS_ERR: 1786 case FTS_NS: 1787 maybe_warn("%s", entry->fts_path); 1788 continue; 1789 case FTS_F: 1790 handle_file(entry->fts_name, entry->fts_statp); 1791 } 1792 } 1793 (void)fts_close(fts); 1794 } 1795 #endif 1796 1797 /* print a ratio - size reduction as a fraction of uncompressed size */ 1798 static void 1799 print_ratio(off_t in, off_t out, FILE *where) 1800 { 1801 int percent10; /* 10 * percent */ 1802 off_t diff; 1803 char buff[8]; 1804 int len; 1805 1806 diff = in - out/2; 1807 if (diff <= 0) 1808 /* 1809 * Output is more than double size of input! print -99.9% 1810 * Quite possibly we've failed to get the original size. 1811 */ 1812 percent10 = -999; 1813 else { 1814 /* 1815 * We only need 12 bits of result from the final division, 1816 * so reduce the values until a 32bit division will suffice. 1817 */ 1818 while (in > 0x100000) { 1819 diff >>= 1; 1820 in >>= 1; 1821 } 1822 if (in != 0) 1823 percent10 = ((u_int)diff * 2000) / (u_int)in - 1000; 1824 else 1825 percent10 = 0; 1826 } 1827 1828 len = snprintf(buff, sizeof buff, "%2.2d.", percent10); 1829 /* Move the '.' to before the last digit */ 1830 buff[len - 1] = buff[len - 2]; 1831 buff[len - 2] = '.'; 1832 fprintf(where, "%5s%%", buff); 1833 } 1834 1835 #ifndef SMALL 1836 /* print compression statistics, and the new name (if there is one!) */ 1837 static void 1838 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize) 1839 { 1840 if (file) 1841 fprintf(stderr, "%s:%s ", file, 1842 strlen(file) < 7 ? "\t\t" : "\t"); 1843 print_ratio(usize, gsize, stderr); 1844 if (nfile) 1845 fprintf(stderr, " -- replaced with %s", nfile); 1846 fprintf(stderr, "\n"); 1847 fflush(stderr); 1848 } 1849 1850 /* print test results */ 1851 static void 1852 print_test(const char *file, int ok) 1853 { 1854 1855 if (exit_value == 0 && ok == 0) 1856 exit_value = 1; 1857 fprintf(stderr, "%s:%s %s\n", file, 1858 strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK"); 1859 fflush(stderr); 1860 } 1861 #endif 1862 1863 /* print a file's info ala --list */ 1864 /* eg: 1865 compressed uncompressed ratio uncompressed_name 1866 354841 1679360 78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar 1867 */ 1868 static void 1869 print_list(int fd, off_t out, const char *outfile, time_t ts) 1870 { 1871 static int first = 1; 1872 #ifndef SMALL 1873 static off_t in_tot, out_tot; 1874 uint32_t crc = 0; 1875 #endif 1876 off_t in = 0, rv; 1877 1878 if (first) { 1879 #ifndef SMALL 1880 if (vflag) 1881 printf("method crc date time "); 1882 #endif 1883 if (qflag == 0) 1884 printf(" compressed uncompressed " 1885 "ratio uncompressed_name\n"); 1886 } 1887 first = 0; 1888 1889 /* print totals? */ 1890 #ifndef SMALL 1891 if (fd == -1) { 1892 in = in_tot; 1893 out = out_tot; 1894 } else 1895 #endif 1896 { 1897 /* read the last 4 bytes - this is the uncompressed size */ 1898 rv = lseek(fd, (off_t)(-8), SEEK_END); 1899 if (rv != -1) { 1900 unsigned char buf[8]; 1901 uint32_t usize; 1902 1903 rv = read(fd, (char *)buf, sizeof(buf)); 1904 if (rv == -1) 1905 maybe_warn("read of uncompressed size"); 1906 else if (rv != sizeof(buf)) 1907 maybe_warnx("read of uncompressed size"); 1908 1909 else { 1910 usize = buf[4] | buf[5] << 8 | 1911 buf[6] << 16 | buf[7] << 24; 1912 in = (off_t)usize; 1913 #ifndef SMALL 1914 crc = buf[0] | buf[1] << 8 | 1915 buf[2] << 16 | buf[3] << 24; 1916 #endif 1917 } 1918 } 1919 } 1920 1921 #ifndef SMALL 1922 if (vflag && fd == -1) 1923 printf(" "); 1924 else if (vflag) { 1925 char *date = ctime(&ts); 1926 1927 /* skip the day, 1/100th second, and year */ 1928 date += 4; 1929 date[12] = 0; 1930 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date); 1931 } 1932 in_tot += in; 1933 out_tot += out; 1934 #endif 1935 printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in); 1936 print_ratio(in, out, stdout); 1937 printf(" %s\n", outfile); 1938 } 1939 1940 /* display the usage of NetBSD gzip */ 1941 static void 1942 usage(void) 1943 { 1944 1945 fprintf(stderr, "%s\n", gzip_version); 1946 fprintf(stderr, 1947 "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n" 1948 #ifndef SMALL 1949 " -1 --fast fastest (worst) compression\n" 1950 " -2 .. -8 set compression level\n" 1951 " -9 --best best (slowest) compression\n" 1952 " -c --stdout write to stdout, keep original files\n" 1953 " --to-stdout\n" 1954 " -d --decompress uncompress files\n" 1955 " --uncompress\n" 1956 " -f --force force overwriting & compress links\n" 1957 " -h --help display this help\n" 1958 " -l --list list compressed file contents\n" 1959 " -N --name save or restore original file name and time stamp\n" 1960 " -n --no-name don't save original file name or time stamp\n" 1961 " -q --quiet output no warnings\n" 1962 " -r --recursive recursively compress files in directories\n" 1963 " -S .suf use suffix .suf instead of .gz\n" 1964 " --suffix .suf\n" 1965 " -t --test test compressed file\n" 1966 " -V --version display program version\n" 1967 " -v --verbose print extra statistics\n", 1968 #else 1969 , 1970 #endif 1971 getprogname()); 1972 exit(0); 1973 } 1974 1975 /* display the version of NetBSD gzip */ 1976 static void 1977 display_version(void) 1978 { 1979 1980 fprintf(stderr, "%s\n", gzip_version); 1981 exit(0); 1982 } 1983 1984 #ifndef NO_BZIP2_SUPPORT 1985 #include "unbzip2.c" 1986 #endif 1987 #ifndef NO_COMPRESS_SUPPORT 1988 #include "zuncompress.c" 1989 #endif 1990 1991 static ssize_t 1992 read_retry(int fd, void *buf, size_t sz) 1993 { 1994 char *cp = buf; 1995 size_t left = MIN(sz, (size_t) SSIZE_MAX); 1996 1997 while (left > 0) { 1998 ssize_t ret; 1999 2000 ret = read(fd, cp, left); 2001 if (ret == -1) { 2002 return ret; 2003 } else if (ret == 0) { 2004 break; /* EOF */ 2005 } 2006 cp += ret; 2007 left -= ret; 2008 } 2009 2010 return sz - left; 2011 } 2012