1 /* $NetBSD: gzip.c,v 1.94 2009/04/12 10:31:14 lukem Exp $ */ 2 /* $DragonFly: src/usr.bin/gzip/gzip.c,v 1.7 2007/12/06 19:54:52 hasso Exp $ */ 3 4 /* 5 * Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 22 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 24 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 /* 31 * gzip.c -- GPL free gzip using zlib. 32 * 33 * RFC 1950 covers the zlib format 34 * RFC 1951 covers the deflate format 35 * RFC 1952 covers the gzip format 36 * 37 * TODO: 38 * - use mmap where possible 39 * - handle some signals better (remove outfile?) 40 * - make bzip2/compress -v/-t/-l support work as well as possible 41 */ 42 43 #include <sys/param.h> 44 #include <sys/stat.h> 45 #include <sys/time.h> 46 47 #include <err.h> 48 #include <errno.h> 49 #include <fcntl.h> 50 #include <fts.h> 51 #include <getopt.h> 52 #include <inttypes.h> 53 #include <libgen.h> 54 #include <stdarg.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <time.h> 59 #include <unistd.h> 60 #include <zlib.h> 61 62 #ifndef PRIdOFF 63 #define PRIdOFF PRId64 64 #endif 65 66 #ifndef PRId64 67 #define PRId64 "lld" 68 #endif 69 70 /* what type of file are we dealing with */ 71 enum filetype { 72 FT_GZIP, 73 #ifndef NO_BZIP2_SUPPORT 74 FT_BZIP2, 75 #endif 76 #ifndef NO_COMPRESS_SUPPORT 77 FT_Z, 78 #endif 79 #ifndef NO_PACK_SUPPORT 80 FT_PACK, 81 #endif 82 FT_LAST, 83 FT_UNKNOWN 84 }; 85 86 #ifndef NO_BZIP2_SUPPORT 87 #include <bzlib.h> 88 89 #define BZ2_SUFFIX ".bz2" 90 #define BZIP2_MAGIC "\102\132\150" 91 #endif 92 93 #ifndef NO_COMPRESS_SUPPORT 94 #define Z_SUFFIX ".Z" 95 #define Z_MAGIC "\037\235" 96 #endif 97 98 #ifndef NO_PACK_SUPPORT 99 #define PACK_MAGIC "\037\036" 100 #endif 101 102 #define GZ_SUFFIX ".gz" 103 104 #define BUFLEN (64 * 1024) 105 106 #define GZIP_MAGIC0 0x1F 107 #define GZIP_MAGIC1 0x8B 108 #define GZIP_OMAGIC1 0x9E 109 110 #define GZIP_TIMESTAMP (off_t)4 111 #define GZIP_ORIGNAME (off_t)10 112 113 #define HEAD_CRC 0x02 114 #define EXTRA_FIELD 0x04 115 #define ORIG_NAME 0x08 116 #define COMMENT 0x10 117 118 #define OS_CODE 3 /* Unix */ 119 120 typedef struct { 121 const char *zipped; 122 int ziplen; 123 const char *normal; /* for unzip - must not be longer than zipped */ 124 } suffixes_t; 125 static suffixes_t suffixes[] = { 126 #define SUFFIX(Z, N) {Z, sizeof Z - 1, N} 127 SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S .xxx */ 128 #ifndef SMALL 129 SUFFIX(GZ_SUFFIX, ""), 130 SUFFIX(".z", ""), 131 SUFFIX("-gz", ""), 132 SUFFIX("-z", ""), 133 SUFFIX("_z", ""), 134 SUFFIX(".taz", ".tar"), 135 SUFFIX(".tgz", ".tar"), 136 #ifndef NO_BZIP2_SUPPORT 137 SUFFIX(BZ2_SUFFIX, ""), 138 #endif 139 #ifndef NO_COMPRESS_SUPPORT 140 SUFFIX(Z_SUFFIX, ""), 141 #endif 142 SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S "" */ 143 #endif /* SMALL */ 144 #undef SUFFIX 145 }; 146 #define NUM_SUFFIXES (sizeof suffixes / sizeof suffixes[0]) 147 148 #define SUFFIX_MAXLEN 30 149 150 static const char gzip_version[] = "NetBSD gzip 20060927"; 151 152 static int cflag; /* stdout mode */ 153 static int dflag; /* decompress mode */ 154 static int lflag; /* list mode */ 155 static int numflag = 6; /* gzip -1..-9 value */ 156 157 #ifndef SMALL 158 static int fflag; /* force mode */ 159 static int kflag; /* don't delete input files */ 160 static int nflag; /* don't save name/timestamp */ 161 static int Nflag; /* don't restore name/timestamp */ 162 static int qflag; /* quiet mode */ 163 static int rflag; /* recursive mode */ 164 static int tflag; /* test */ 165 static int vflag; /* verbose mode */ 166 #else 167 #define qflag 0 168 #define tflag 0 169 #endif 170 171 static int exit_value = 0; /* exit value */ 172 173 static char *infile; /* name of file coming in */ 174 175 static void maybe_err(const char *fmt, ...) 176 __attribute__((__format__(__printf__, 1, 2))); 177 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) 178 static void maybe_errx(const char *fmt, ...) 179 __attribute__((__format__(__printf__, 1, 2))); 180 #endif 181 static void maybe_warn(const char *fmt, ...) 182 __attribute__((__format__(__printf__, 1, 2))); 183 static void maybe_warnx(const char *fmt, ...) 184 __attribute__((__format__(__printf__, 1, 2))); 185 static enum filetype file_gettype(u_char *); 186 #ifdef SMALL 187 #define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz) 188 #endif 189 static off_t gz_compress(int, int, off_t *, const char *, uint32_t); 190 static off_t gz_uncompress(int, int, char *, size_t, off_t *, const char *); 191 static off_t file_compress(char *, char *, size_t); 192 static off_t file_uncompress(char *, char *, size_t); 193 static void handle_pathname(char *); 194 static void handle_file(char *, struct stat *); 195 static void handle_stdin(void); 196 static void handle_stdout(void); 197 static void print_ratio(off_t, off_t, FILE *); 198 static void print_list(int fd, off_t, const char *, time_t); 199 static void usage(void); 200 static void display_version(void); 201 static const suffixes_t *check_suffix(char *, int); 202 static ssize_t read_retry(int, void *, size_t); 203 204 #ifdef SMALL 205 #define unlink_input(f, sb) unlink(f) 206 #else 207 static off_t cat_fd(unsigned char *, size_t, off_t *, int fd); 208 static void prepend_gzip(char *, int *, char ***); 209 static void handle_dir(char *); 210 static void print_verbage(const char *, const char *, off_t, off_t); 211 static void print_test(const char *, int); 212 static void copymodes(int fd, const struct stat *, const char *file); 213 static int check_outfile(const char *outfile); 214 #endif 215 216 #ifndef NO_BZIP2_SUPPORT 217 static off_t unbzip2(int, int, char *, size_t, off_t *); 218 #endif 219 220 #ifndef NO_COMPRESS_SUPPORT 221 static FILE *zdopen(int); 222 static off_t zuncompress(FILE *, FILE *, char *, size_t, off_t *); 223 #endif 224 225 #ifndef NO_PACK_SUPPORT 226 static off_t unpack(int, int, char *, size_t, off_t *); 227 #endif 228 229 int main(int, char *p[]); 230 231 #ifdef SMALL 232 #define getopt_long(a,b,c,d,e) getopt(a,b,c) 233 #else 234 static const struct option longopts[] = { 235 { "stdout", no_argument, 0, 'c' }, 236 { "to-stdout", no_argument, 0, 'c' }, 237 { "decompress", no_argument, 0, 'd' }, 238 { "uncompress", no_argument, 0, 'd' }, 239 { "force", no_argument, 0, 'f' }, 240 { "help", no_argument, 0, 'h' }, 241 { "keep", no_argument, 0, 'k' }, 242 { "list", no_argument, 0, 'l' }, 243 { "no-name", no_argument, 0, 'n' }, 244 { "name", no_argument, 0, 'N' }, 245 { "quiet", no_argument, 0, 'q' }, 246 { "recursive", no_argument, 0, 'r' }, 247 { "suffix", required_argument, 0, 'S' }, 248 { "test", no_argument, 0, 't' }, 249 { "verbose", no_argument, 0, 'v' }, 250 { "version", no_argument, 0, 'V' }, 251 { "fast", no_argument, 0, '1' }, 252 { "best", no_argument, 0, '9' }, 253 #if 0 254 /* 255 * This is what else GNU gzip implements. --ascii isn't useful 256 * on NetBSD, and I don't care to have a --license. 257 */ 258 { "ascii", no_argument, 0, 'a' }, 259 { "license", no_argument, 0, 'L' }, 260 #endif 261 { NULL, no_argument, 0, 0 }, 262 }; 263 #endif 264 265 int 266 main(int argc, char **argv) 267 { 268 const char *progname = getprogname(); 269 #ifndef SMALL 270 char *gzip; 271 int len; 272 #endif 273 int ch; 274 275 /* XXX set up signals */ 276 277 #ifndef SMALL 278 if ((gzip = getenv("GZIP")) != NULL) 279 prepend_gzip(gzip, &argc, &argv); 280 #endif 281 282 /* 283 * XXX 284 * handle being called `gunzip', `zcat' and `gzcat' 285 */ 286 if (strcmp(progname, "gunzip") == 0) 287 dflag = 1; 288 else if (strcmp(progname, "zcat") == 0 || 289 strcmp(progname, "gzcat") == 0) 290 dflag = cflag = 1; 291 292 #ifdef SMALL 293 #define OPT_LIST "123456789cdhltV" 294 #else 295 #define OPT_LIST "123456789cdfhklNnqrS:tVv" 296 #endif 297 298 while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) { 299 switch (ch) { 300 case '1': case '2': case '3': 301 case '4': case '5': case '6': 302 case '7': case '8': case '9': 303 numflag = ch - '0'; 304 break; 305 case 'c': 306 cflag = 1; 307 break; 308 case 'd': 309 dflag = 1; 310 break; 311 case 'l': 312 lflag = 1; 313 dflag = 1; 314 break; 315 case 'V': 316 display_version(); 317 /* NOTREACHED */ 318 #ifndef SMALL 319 case 'f': 320 fflag = 1; 321 break; 322 case 'k': 323 kflag = 1; 324 break; 325 case 'N': 326 nflag = 0; 327 Nflag = 1; 328 break; 329 case 'n': 330 nflag = 1; 331 Nflag = 0; 332 break; 333 case 'q': 334 qflag = 1; 335 break; 336 case 'r': 337 rflag = 1; 338 break; 339 case 'S': 340 len = strlen(optarg); 341 if (len != 0) { 342 if (len >= SUFFIX_MAXLEN) 343 errx(1, "incorrect suffix: '%s'", optarg); 344 suffixes[0].zipped = optarg; 345 suffixes[0].ziplen = len; 346 } else { 347 suffixes[NUM_SUFFIXES - 1].zipped = ""; 348 suffixes[NUM_SUFFIXES - 1].ziplen = 0; 349 } 350 break; 351 case 't': 352 cflag = 1; 353 tflag = 1; 354 dflag = 1; 355 break; 356 case 'v': 357 vflag = 1; 358 break; 359 #endif 360 default: 361 usage(); 362 /* NOTREACHED */ 363 } 364 } 365 argv += optind; 366 argc -= optind; 367 368 if (argc == 0) { 369 if (dflag) /* stdin mode */ 370 handle_stdin(); 371 else /* stdout mode */ 372 handle_stdout(); 373 } else { 374 do { 375 handle_pathname(argv[0]); 376 } while (*++argv); 377 } 378 #ifndef SMALL 379 if (qflag == 0 && lflag && argc > 1) 380 print_list(-1, 0, "(totals)", 0); 381 #endif 382 exit(exit_value); 383 } 384 385 /* maybe print a warning */ 386 void 387 maybe_warn(const char *fmt, ...) 388 { 389 va_list ap; 390 391 if (qflag == 0) { 392 va_start(ap, fmt); 393 vwarn(fmt, ap); 394 va_end(ap); 395 } 396 if (exit_value == 0) 397 exit_value = 1; 398 } 399 400 /* ... without an errno. */ 401 void 402 maybe_warnx(const char *fmt, ...) 403 { 404 va_list ap; 405 406 if (qflag == 0) { 407 va_start(ap, fmt); 408 vwarnx(fmt, ap); 409 va_end(ap); 410 } 411 if (exit_value == 0) 412 exit_value = 1; 413 } 414 415 /* maybe print an error */ 416 void 417 maybe_err(const char *fmt, ...) 418 { 419 va_list ap; 420 421 if (qflag == 0) { 422 va_start(ap, fmt); 423 vwarn(fmt, ap); 424 va_end(ap); 425 } 426 exit(2); 427 } 428 429 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) 430 /* ... without an errno. */ 431 void 432 maybe_errx(const char *fmt, ...) 433 { 434 va_list ap; 435 436 if (qflag == 0) { 437 va_start(ap, fmt); 438 vwarnx(fmt, ap); 439 va_end(ap); 440 } 441 exit(2); 442 } 443 #endif 444 445 #ifndef SMALL 446 /* split up $GZIP and prepend it to the argument list */ 447 static void 448 prepend_gzip(char *gzip, int *argc, char ***argv) 449 { 450 char *s, **nargv, **ac; 451 int nenvarg = 0, i; 452 453 /* scan how many arguments there are */ 454 for (s = gzip;;) { 455 while (*s == ' ' || *s == '\t') 456 s++; 457 if (*s == 0) 458 goto count_done; 459 nenvarg++; 460 while (*s != ' ' && *s != '\t') 461 if (*s++ == 0) 462 goto count_done; 463 } 464 count_done: 465 /* punt early */ 466 if (nenvarg == 0) 467 return; 468 469 *argc += nenvarg; 470 ac = *argv; 471 472 nargv = (char **)malloc((*argc + 1) * sizeof(char *)); 473 if (nargv == NULL) 474 maybe_err("malloc"); 475 476 /* stash this away */ 477 *argv = nargv; 478 479 /* copy the program name first */ 480 i = 0; 481 nargv[i++] = *(ac++); 482 483 /* take a copy of $GZIP and add it to the array */ 484 s = strdup(gzip); 485 if (s == NULL) 486 maybe_err("strdup"); 487 for (;;) { 488 /* Skip whitespaces. */ 489 while (*s == ' ' || *s == '\t') 490 s++; 491 if (*s == 0) 492 goto copy_done; 493 nargv[i++] = s; 494 /* Find the end of this argument. */ 495 while (*s != ' ' && *s != '\t') 496 if (*s++ == 0) 497 /* Argument followed by NUL. */ 498 goto copy_done; 499 /* Terminate by overwriting ' ' or '\t' with NUL. */ 500 *s++ = 0; 501 } 502 copy_done: 503 504 /* copy the original arguments and a NULL */ 505 while (*ac) 506 nargv[i++] = *(ac++); 507 nargv[i] = NULL; 508 } 509 #endif 510 511 /* compress input to output. Return bytes read, -1 on error */ 512 static off_t 513 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime) 514 { 515 z_stream z; 516 char *outbufp, *inbufp; 517 off_t in_tot = 0, out_tot = 0; 518 ssize_t in_size; 519 int i, error; 520 uLong crc; 521 #ifdef SMALL 522 static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0, 523 0, 0, 0, 0, 524 0, OS_CODE }; 525 #endif 526 527 outbufp = malloc(BUFLEN); 528 inbufp = malloc(BUFLEN); 529 if (outbufp == NULL || inbufp == NULL) { 530 maybe_err("malloc failed"); 531 goto out; 532 } 533 534 memset(&z, 0, sizeof z); 535 z.zalloc = Z_NULL; 536 z.zfree = Z_NULL; 537 z.opaque = 0; 538 539 #ifdef SMALL 540 memcpy(outbufp, header, sizeof header); 541 i = sizeof header; 542 #else 543 if (nflag != 0) { 544 mtime = 0; 545 origname = ""; 546 } 547 548 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s", 549 GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 550 *origname ? ORIG_NAME : 0, 551 mtime & 0xff, 552 (mtime >> 8) & 0xff, 553 (mtime >> 16) & 0xff, 554 (mtime >> 24) & 0xff, 555 numflag == 1 ? 4 : numflag == 9 ? 2 : 0, 556 OS_CODE, origname); 557 if (i >= BUFLEN) 558 /* this need PATH_MAX > BUFLEN ... */ 559 maybe_err("snprintf"); 560 if (*origname) 561 i++; 562 #endif 563 564 z.next_out = outbufp + i; 565 z.avail_out = BUFLEN - i; 566 567 error = deflateInit2(&z, numflag, Z_DEFLATED, 568 (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY); 569 if (error != Z_OK) { 570 maybe_warnx("deflateInit2 failed"); 571 in_tot = -1; 572 goto out; 573 } 574 575 crc = crc32(0L, Z_NULL, 0); 576 for (;;) { 577 if (z.avail_out == 0) { 578 if (write(out, outbufp, BUFLEN) != BUFLEN) { 579 maybe_warn("write"); 580 out_tot = -1; 581 goto out; 582 } 583 584 out_tot += BUFLEN; 585 z.next_out = outbufp; 586 z.avail_out = BUFLEN; 587 } 588 589 if (z.avail_in == 0) { 590 in_size = read(in, inbufp, BUFLEN); 591 if (in_size < 0) { 592 maybe_warn("read"); 593 in_tot = -1; 594 goto out; 595 } 596 if (in_size == 0) 597 break; 598 599 crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size); 600 in_tot += in_size; 601 z.next_in = inbufp; 602 z.avail_in = in_size; 603 } 604 605 error = deflate(&z, Z_NO_FLUSH); 606 if (error != Z_OK && error != Z_STREAM_END) { 607 maybe_warnx("deflate failed"); 608 in_tot = -1; 609 goto out; 610 } 611 } 612 613 /* clean up */ 614 for (;;) { 615 size_t len; 616 ssize_t w; 617 618 error = deflate(&z, Z_FINISH); 619 if (error != Z_OK && error != Z_STREAM_END) { 620 maybe_warnx("deflate failed"); 621 in_tot = -1; 622 goto out; 623 } 624 625 len = (char *)z.next_out - outbufp; 626 627 w = write(out, outbufp, len); 628 if (w == -1 || (size_t)w != len) { 629 maybe_warn("write"); 630 out_tot = -1; 631 goto out; 632 } 633 out_tot += len; 634 z.next_out = outbufp; 635 z.avail_out = BUFLEN; 636 637 if (error == Z_STREAM_END) 638 break; 639 } 640 641 if (deflateEnd(&z) != Z_OK) { 642 maybe_warnx("deflateEnd failed"); 643 in_tot = -1; 644 goto out; 645 } 646 647 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c", 648 (int)crc & 0xff, 649 (int)(crc >> 8) & 0xff, 650 (int)(crc >> 16) & 0xff, 651 (int)(crc >> 24) & 0xff, 652 (int)in_tot & 0xff, 653 (int)(in_tot >> 8) & 0xff, 654 (int)(in_tot >> 16) & 0xff, 655 (int)(in_tot >> 24) & 0xff); 656 if (i != 8) 657 maybe_err("snprintf"); 658 #if 0 659 if (in_tot > 0xffffffff) 660 maybe_warn("input file size >= 4GB cannot be saved"); 661 #endif 662 if (write(out, outbufp, i) != i) { 663 maybe_warn("write"); 664 in_tot = -1; 665 } else 666 out_tot += i; 667 668 out: 669 if (inbufp != NULL) 670 free(inbufp); 671 if (outbufp != NULL) 672 free(outbufp); 673 if (gsizep) 674 *gsizep = out_tot; 675 return in_tot; 676 } 677 678 /* 679 * uncompress input to output then close the input. return the 680 * uncompressed size written, and put the compressed sized read 681 * into `*gsizep'. 682 */ 683 static off_t 684 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep, 685 const char *filename) 686 { 687 z_stream z; 688 char *outbufp, *inbufp; 689 off_t out_tot = -1, in_tot = 0; 690 uint32_t out_sub_tot = 0; 691 enum { 692 GZSTATE_MAGIC0, 693 GZSTATE_MAGIC1, 694 GZSTATE_METHOD, 695 GZSTATE_FLAGS, 696 GZSTATE_SKIPPING, 697 GZSTATE_EXTRA, 698 GZSTATE_EXTRA2, 699 GZSTATE_EXTRA3, 700 GZSTATE_ORIGNAME, 701 GZSTATE_COMMENT, 702 GZSTATE_HEAD_CRC1, 703 GZSTATE_HEAD_CRC2, 704 GZSTATE_INIT, 705 GZSTATE_READ, 706 GZSTATE_CRC, 707 GZSTATE_LEN, 708 } state = GZSTATE_MAGIC0; 709 int flags = 0, skip_count = 0; 710 int error = Z_STREAM_ERROR, done_reading = 0; 711 uLong crc = 0; 712 ssize_t wr; 713 int needmore = 0; 714 715 #define ADVANCE() { z.next_in++; z.avail_in--; } 716 717 if ((outbufp = malloc(BUFLEN)) == NULL) { 718 maybe_err("malloc failed"); 719 goto out2; 720 } 721 if ((inbufp = malloc(BUFLEN)) == NULL) { 722 maybe_err("malloc failed"); 723 goto out1; 724 } 725 726 memset(&z, 0, sizeof z); 727 z.avail_in = prelen; 728 z.next_in = pre; 729 z.avail_out = BUFLEN; 730 z.next_out = outbufp; 731 z.zalloc = NULL; 732 z.zfree = NULL; 733 z.opaque = 0; 734 735 in_tot = prelen; 736 out_tot = 0; 737 738 for (;;) { 739 if ((z.avail_in == 0 || needmore) && done_reading == 0) { 740 ssize_t in_size; 741 742 if (z.avail_in > 0) { 743 memmove(inbufp, z.next_in, z.avail_in); 744 } 745 z.next_in = inbufp; 746 in_size = read(in, z.next_in + z.avail_in, 747 BUFLEN - z.avail_in); 748 749 if (in_size == -1) { 750 maybe_warn("failed to read stdin"); 751 goto stop_and_fail; 752 } else if (in_size == 0) { 753 done_reading = 1; 754 } 755 756 z.avail_in += in_size; 757 needmore = 0; 758 759 in_tot += in_size; 760 } 761 if (z.avail_in == 0) { 762 if (done_reading && state != GZSTATE_MAGIC0) { 763 maybe_warnx("%s: unexpected end of file", 764 filename); 765 goto stop_and_fail; 766 } 767 goto stop; 768 } 769 switch (state) { 770 case GZSTATE_MAGIC0: 771 if (*z.next_in != GZIP_MAGIC0) { 772 if (in_tot > 0) { 773 maybe_warnx("%s: trailing garbage " 774 "ignored", filename); 775 goto stop; 776 } 777 maybe_warnx("input not gziped (MAGIC0)"); 778 goto stop_and_fail; 779 } 780 ADVANCE(); 781 state++; 782 out_sub_tot = 0; 783 crc = crc32(0L, Z_NULL, 0); 784 break; 785 786 case GZSTATE_MAGIC1: 787 if (*z.next_in != GZIP_MAGIC1 && 788 *z.next_in != GZIP_OMAGIC1) { 789 maybe_warnx("input not gziped (MAGIC1)"); 790 goto stop_and_fail; 791 } 792 ADVANCE(); 793 state++; 794 break; 795 796 case GZSTATE_METHOD: 797 if (*z.next_in != Z_DEFLATED) { 798 maybe_warnx("unknown compression method"); 799 goto stop_and_fail; 800 } 801 ADVANCE(); 802 state++; 803 break; 804 805 case GZSTATE_FLAGS: 806 flags = *z.next_in; 807 ADVANCE(); 808 skip_count = 6; 809 state++; 810 break; 811 812 case GZSTATE_SKIPPING: 813 if (skip_count > 0) { 814 skip_count--; 815 ADVANCE(); 816 } else 817 state++; 818 break; 819 820 case GZSTATE_EXTRA: 821 if ((flags & EXTRA_FIELD) == 0) { 822 state = GZSTATE_ORIGNAME; 823 break; 824 } 825 skip_count = *z.next_in; 826 ADVANCE(); 827 state++; 828 break; 829 830 case GZSTATE_EXTRA2: 831 skip_count |= ((*z.next_in) << 8); 832 ADVANCE(); 833 state++; 834 break; 835 836 case GZSTATE_EXTRA3: 837 if (skip_count > 0) { 838 skip_count--; 839 ADVANCE(); 840 } else 841 state++; 842 break; 843 844 case GZSTATE_ORIGNAME: 845 if ((flags & ORIG_NAME) == 0) { 846 state++; 847 break; 848 } 849 if (*z.next_in == 0) 850 state++; 851 ADVANCE(); 852 break; 853 854 case GZSTATE_COMMENT: 855 if ((flags & COMMENT) == 0) { 856 state++; 857 break; 858 } 859 if (*z.next_in == 0) 860 state++; 861 ADVANCE(); 862 break; 863 864 case GZSTATE_HEAD_CRC1: 865 if (flags & HEAD_CRC) 866 skip_count = 2; 867 else 868 skip_count = 0; 869 state++; 870 break; 871 872 case GZSTATE_HEAD_CRC2: 873 if (skip_count > 0) { 874 skip_count--; 875 ADVANCE(); 876 } else 877 state++; 878 break; 879 880 case GZSTATE_INIT: 881 if (inflateInit2(&z, -MAX_WBITS) != Z_OK) { 882 maybe_warnx("failed to inflateInit"); 883 goto stop_and_fail; 884 } 885 state++; 886 break; 887 888 case GZSTATE_READ: 889 error = inflate(&z, Z_FINISH); 890 switch (error) { 891 /* Z_BUF_ERROR goes with Z_FINISH... */ 892 case Z_BUF_ERROR: 893 if (z.avail_out > 0 && !done_reading) 894 continue; 895 case Z_STREAM_END: 896 case Z_OK: 897 break; 898 899 case Z_NEED_DICT: 900 maybe_warnx("Z_NEED_DICT error"); 901 goto stop_and_fail; 902 case Z_DATA_ERROR: 903 maybe_warnx("data stream error"); 904 goto stop_and_fail; 905 case Z_STREAM_ERROR: 906 maybe_warnx("internal stream error"); 907 goto stop_and_fail; 908 case Z_MEM_ERROR: 909 maybe_warnx("memory allocation error"); 910 goto stop_and_fail; 911 912 default: 913 maybe_warn("unknown error from inflate(): %d", 914 error); 915 } 916 wr = BUFLEN - z.avail_out; 917 918 if (wr != 0) { 919 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr); 920 if ( 921 #ifndef SMALL 922 /* don't write anything with -t */ 923 tflag == 0 && 924 #endif 925 write(out, outbufp, wr) != wr) { 926 maybe_warn("error writing to output"); 927 goto stop_and_fail; 928 } 929 930 out_tot += wr; 931 out_sub_tot += wr; 932 } 933 934 if (error == Z_STREAM_END) { 935 inflateEnd(&z); 936 state++; 937 } 938 939 z.next_out = outbufp; 940 z.avail_out = BUFLEN; 941 942 break; 943 case GZSTATE_CRC: 944 { 945 uLong origcrc; 946 947 if (z.avail_in < 4) { 948 if (!done_reading) { 949 needmore = 1; 950 continue; 951 } 952 maybe_warnx("truncated input"); 953 goto stop_and_fail; 954 } 955 origcrc = ((unsigned)z.next_in[0] & 0xff) | 956 ((unsigned)z.next_in[1] & 0xff) << 8 | 957 ((unsigned)z.next_in[2] & 0xff) << 16 | 958 ((unsigned)z.next_in[3] & 0xff) << 24; 959 if (origcrc != crc) { 960 maybe_warnx("invalid compressed" 961 " data--crc error"); 962 goto stop_and_fail; 963 } 964 } 965 966 z.avail_in -= 4; 967 z.next_in += 4; 968 969 if (!z.avail_in && done_reading) { 970 goto stop; 971 } 972 state++; 973 break; 974 case GZSTATE_LEN: 975 { 976 uLong origlen; 977 978 if (z.avail_in < 4) { 979 if (!done_reading) { 980 needmore = 1; 981 continue; 982 } 983 maybe_warnx("truncated input"); 984 goto stop_and_fail; 985 } 986 origlen = ((unsigned)z.next_in[0] & 0xff) | 987 ((unsigned)z.next_in[1] & 0xff) << 8 | 988 ((unsigned)z.next_in[2] & 0xff) << 16 | 989 ((unsigned)z.next_in[3] & 0xff) << 24; 990 991 if (origlen != out_sub_tot) { 992 maybe_warnx("invalid compressed" 993 " data--length error"); 994 goto stop_and_fail; 995 } 996 } 997 998 z.avail_in -= 4; 999 z.next_in += 4; 1000 1001 if (error < 0) { 1002 maybe_warnx("decompression error"); 1003 goto stop_and_fail; 1004 } 1005 state = GZSTATE_MAGIC0; 1006 break; 1007 } 1008 continue; 1009 stop_and_fail: 1010 out_tot = -1; 1011 stop: 1012 break; 1013 } 1014 if (state > GZSTATE_INIT) 1015 inflateEnd(&z); 1016 1017 free(inbufp); 1018 out1: 1019 free(outbufp); 1020 out2: 1021 if (gsizep) 1022 *gsizep = in_tot; 1023 return (out_tot); 1024 } 1025 1026 #ifndef SMALL 1027 /* 1028 * set the owner, mode, flags & utimes using the given file descriptor. 1029 * file is only used in possible warning messages. 1030 */ 1031 static void 1032 copymodes(int fd, const struct stat *sbp, const char *file) 1033 { 1034 struct timeval times[2]; 1035 struct stat sb; 1036 1037 /* 1038 * If we have no info on the input, give this file some 1039 * default values and return.. 1040 */ 1041 if (sbp == NULL) { 1042 mode_t mask = umask(022); 1043 1044 (void)fchmod(fd, DEFFILEMODE & ~mask); 1045 (void)umask(mask); 1046 return; 1047 } 1048 sb = *sbp; 1049 1050 /* if the chown fails, remove set-id bits as-per compress(1) */ 1051 if (fchown(fd, sb.st_uid, sb.st_gid) < 0) { 1052 if (errno != EPERM) 1053 maybe_warn("couldn't fchown: %s", file); 1054 sb.st_mode &= ~(S_ISUID|S_ISGID); 1055 } 1056 1057 /* we only allow set-id and the 9 normal permission bits */ 1058 sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 1059 if (fchmod(fd, sb.st_mode) < 0) 1060 maybe_warn("couldn't fchmod: %s", file); 1061 1062 /* only try flags if they exist already */ 1063 if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0) 1064 maybe_warn("couldn't fchflags: %s", file); 1065 1066 TIMESPEC_TO_TIMEVAL(×[0], &sb.st_atimespec); 1067 TIMESPEC_TO_TIMEVAL(×[1], &sb.st_mtimespec); 1068 if (futimes(fd, times) < 0) 1069 maybe_warn("couldn't utimes: %s", file); 1070 } 1071 #endif 1072 1073 /* what sort of file is this? */ 1074 static enum filetype 1075 file_gettype(u_char *buf) 1076 { 1077 1078 if (buf[0] == GZIP_MAGIC0 && 1079 (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1)) 1080 return FT_GZIP; 1081 else 1082 #ifndef NO_BZIP2_SUPPORT 1083 if (memcmp(buf, BZIP2_MAGIC, 3) == 0 && 1084 buf[3] >= '0' && buf[3] <= '9') 1085 return FT_BZIP2; 1086 else 1087 #endif 1088 #ifndef NO_COMPRESS_SUPPORT 1089 if (memcmp(buf, Z_MAGIC, 2) == 0) 1090 return FT_Z; 1091 else 1092 #endif 1093 #ifndef NO_PACK_SUPPORT 1094 if (memcmp(buf, PACK_MAGIC, 2) == 0) 1095 return FT_PACK; 1096 else 1097 #endif 1098 return FT_UNKNOWN; 1099 } 1100 1101 #ifndef SMALL 1102 /* check the outfile is OK. */ 1103 static int 1104 check_outfile(const char *outfile) 1105 { 1106 struct stat sb; 1107 int ok = 1; 1108 1109 if (lflag == 0 && stat(outfile, &sb) == 0) { 1110 if (fflag) 1111 unlink(outfile); 1112 else if (isatty(STDIN_FILENO)) { 1113 char ans[10] = { 'n', '\0' }; /* default */ 1114 1115 fprintf(stderr, "%s already exists -- do you wish to " 1116 "overwrite (y or n)? " , outfile); 1117 (void)fgets(ans, sizeof(ans) - 1, stdin); 1118 if (ans[0] != 'y' && ans[0] != 'Y') { 1119 fprintf(stderr, "\tnot overwriting\n"); 1120 ok = 0; 1121 } else 1122 unlink(outfile); 1123 } else { 1124 maybe_warnx("%s already exists -- skipping", outfile); 1125 ok = 0; 1126 } 1127 } 1128 return ok; 1129 } 1130 1131 static void 1132 unlink_input(const char *file, const struct stat *sb) 1133 { 1134 struct stat nsb; 1135 1136 if (kflag) 1137 return; 1138 if (stat(file, &nsb) != 0) 1139 /* Must be gone alrady */ 1140 return; 1141 if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino) 1142 /* Definitely a different file */ 1143 return; 1144 unlink(file); 1145 } 1146 #endif 1147 1148 static const suffixes_t * 1149 check_suffix(char *file, int xlate) 1150 { 1151 const suffixes_t *s; 1152 int len = strlen(file); 1153 char *sp; 1154 1155 for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) { 1156 /* if it doesn't fit in "a.suf", don't bother */ 1157 if (s->ziplen >= len) 1158 continue; 1159 sp = file + len - s->ziplen; 1160 if (strcmp(s->zipped, sp) != 0) 1161 continue; 1162 if (xlate) 1163 strcpy(sp, s->normal); 1164 return s; 1165 } 1166 return NULL; 1167 } 1168 1169 /* 1170 * compress the given file: create a corresponding .gz file and remove the 1171 * original. 1172 */ 1173 static off_t 1174 file_compress(char *file, char *outfile, size_t outsize) 1175 { 1176 int in; 1177 int out; 1178 off_t size, insize; 1179 #ifndef SMALL 1180 struct stat isb, osb; 1181 const suffixes_t *suff; 1182 #endif 1183 1184 in = open(file, O_RDONLY); 1185 if (in == -1) { 1186 maybe_warn("can't open %s", file); 1187 return -1; 1188 } 1189 1190 if (cflag == 0) { 1191 #ifndef SMALL 1192 if (fstat(in, &isb) == 0) { 1193 if (isb.st_nlink > 1 && fflag == 0) { 1194 maybe_warnx("%s has %d other link%s -- " 1195 "skipping", file, isb.st_nlink - 1, 1196 isb.st_nlink == 1 ? "" : "s"); 1197 close(in); 1198 return -1; 1199 } 1200 } 1201 1202 if (fflag == 0 && (suff = check_suffix(file, 0)) 1203 && suff->zipped[0] != 0) { 1204 maybe_warnx("%s already has %s suffix -- unchanged", 1205 file, suff->zipped); 1206 close(in); 1207 return -1; 1208 } 1209 #endif 1210 1211 /* Add (usually) .gz to filename */ 1212 if ((size_t)snprintf(outfile, outsize, "%s%s", 1213 file, suffixes[0].zipped) >= outsize) { 1214 errx(1, "file path too long: %s", file); 1215 } 1216 #ifndef SMALL 1217 if (check_outfile(outfile) == 0) { 1218 close(in); 1219 return -1; 1220 } 1221 #endif 1222 } 1223 1224 if (cflag == 0) { 1225 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600); 1226 if (out == -1) { 1227 maybe_warn("could not create output: %s", outfile); 1228 fclose(stdin); 1229 return -1; 1230 } 1231 } else 1232 out = STDOUT_FILENO; 1233 1234 insize = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime); 1235 1236 (void)close(in); 1237 1238 /* 1239 * If there was an error, insize will be -1. 1240 * If we compressed to stdout, just return the size. 1241 * Otherwise stat the file and check it is the correct size. 1242 * We only blow away the file if we can stat the output and it 1243 * has the expected size. 1244 */ 1245 if (cflag != 0) 1246 return insize == -1 ? -1 : size; 1247 1248 #ifndef SMALL 1249 if (fstat(out, &osb) != 0) { 1250 maybe_warn("couldn't stat: %s", outfile); 1251 goto bad_outfile; 1252 } 1253 1254 if (osb.st_size != size) { 1255 maybe_warnx("output file: %s wrong size (%" PRIdOFF 1256 " != %" PRIdOFF "), deleting", 1257 outfile, osb.st_size, size); 1258 goto bad_outfile; 1259 } 1260 1261 copymodes(out, &isb, outfile); 1262 #endif 1263 if (close(out) == -1) 1264 maybe_warn("couldn't close output"); 1265 1266 /* output is good, ok to delete input */ 1267 unlink_input(file, &isb); 1268 return size; 1269 1270 #ifndef SMALL 1271 bad_outfile: 1272 if (close(out) == -1) 1273 maybe_warn("couldn't close output"); 1274 1275 maybe_warnx("leaving original %s", file); 1276 unlink(outfile); 1277 return size; 1278 #endif 1279 } 1280 1281 /* uncompress the given file and remove the original */ 1282 static off_t 1283 file_uncompress(char *file, char *outfile, size_t outsize) 1284 { 1285 struct stat isb, osb; 1286 off_t size; 1287 ssize_t rbytes; 1288 unsigned char header1[4]; 1289 enum filetype method; 1290 int fd, ofd, zfd = -1; 1291 #ifndef SMALL 1292 ssize_t rv; 1293 time_t timestamp = 0; 1294 unsigned char name[PATH_MAX + 1]; 1295 #endif 1296 1297 /* gather the old name info */ 1298 1299 fd = open(file, O_RDONLY); 1300 if (fd < 0) { 1301 maybe_warn("can't open %s", file); 1302 goto lose; 1303 } 1304 1305 if ((size_t)snprintf(outfile, outsize, "%s", file) >= outsize) 1306 errx(1, "file path too long: %s", file); 1307 if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) { 1308 maybe_warnx("%s: unknown suffix -- ignored", file); 1309 goto lose; 1310 } 1311 1312 rbytes = read(fd, header1, sizeof header1); 1313 if (rbytes != sizeof header1) { 1314 /* we don't want to fail here. */ 1315 #ifndef SMALL 1316 if (fflag) 1317 goto lose; 1318 #endif 1319 if (rbytes == -1) 1320 maybe_warn("can't read %s", file); 1321 else 1322 goto unexpected_EOF; 1323 goto lose; 1324 } 1325 1326 method = file_gettype(header1); 1327 1328 #ifndef SMALL 1329 if (fflag == 0 && method == FT_UNKNOWN) { 1330 maybe_warnx("%s: not in gzip format", file); 1331 goto lose; 1332 } 1333 1334 #endif 1335 1336 #ifndef SMALL 1337 if (method == FT_GZIP && Nflag) { 1338 unsigned char ts[4]; /* timestamp */ 1339 1340 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP); 1341 if (rv >= 0 && rv < (ssize_t)(sizeof ts)) 1342 goto unexpected_EOF; 1343 if (rv == -1) { 1344 if (!fflag) 1345 maybe_warn("can't read %s", file); 1346 goto lose; 1347 } 1348 timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0]; 1349 1350 if (header1[3] & ORIG_NAME) { 1351 rbytes = pread(fd, name, sizeof name, GZIP_ORIGNAME); 1352 if (rbytes < 0) { 1353 maybe_warn("can't read %s", file); 1354 goto lose; 1355 } 1356 if (name[0] != 0) { 1357 /* preserve original directory name */ 1358 char *dp = strrchr(file, '/'); 1359 if (dp == NULL) 1360 dp = file; 1361 else 1362 dp++; 1363 snprintf(outfile, outsize, "%.*s%.*s", 1364 (int) (dp - file), 1365 file, (int) rbytes, name); 1366 } 1367 } 1368 } 1369 #endif 1370 lseek(fd, 0, SEEK_SET); 1371 1372 if (cflag == 0 || lflag) { 1373 if (fstat(fd, &isb) != 0) 1374 goto lose; 1375 #ifndef SMALL 1376 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) { 1377 maybe_warnx("%s has %d other links -- skipping", 1378 file, isb.st_nlink - 1); 1379 goto lose; 1380 } 1381 if (nflag == 0 && timestamp) 1382 isb.st_mtime = timestamp; 1383 if (check_outfile(outfile) == 0) 1384 goto lose; 1385 #endif 1386 } 1387 1388 if (cflag == 0 && lflag == 0) { 1389 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600); 1390 if (zfd == STDOUT_FILENO) { 1391 /* We won't close STDOUT_FILENO later... */ 1392 zfd = dup(zfd); 1393 close(STDOUT_FILENO); 1394 } 1395 if (zfd == -1) { 1396 maybe_warn("can't open %s", outfile); 1397 goto lose; 1398 } 1399 } else 1400 zfd = STDOUT_FILENO; 1401 1402 #ifndef NO_BZIP2_SUPPORT 1403 if (method == FT_BZIP2) { 1404 1405 /* XXX */ 1406 if (lflag) { 1407 maybe_warnx("no -l with bzip2 files"); 1408 goto lose; 1409 } 1410 1411 size = unbzip2(fd, zfd, NULL, 0, NULL); 1412 } else 1413 #endif 1414 1415 #ifndef NO_COMPRESS_SUPPORT 1416 if (method == FT_Z) { 1417 FILE *in, *out; 1418 1419 /* XXX */ 1420 if (lflag) { 1421 maybe_warnx("no -l with Lempel-Ziv files"); 1422 goto lose; 1423 } 1424 1425 if ((in = zdopen(fd)) == NULL) { 1426 maybe_warn("zdopen for read: %s", file); 1427 goto lose; 1428 } 1429 1430 out = fdopen(dup(zfd), "w"); 1431 if (out == NULL) { 1432 maybe_warn("fdopen for write: %s", outfile); 1433 fclose(in); 1434 goto lose; 1435 } 1436 1437 size = zuncompress(in, out, NULL, 0, NULL); 1438 /* need to fclose() if ferror() is true... */ 1439 if (ferror(in) | fclose(in)) { 1440 maybe_warn("failed infile fclose"); 1441 unlink(outfile); 1442 (void)fclose(out); 1443 } 1444 if (fclose(out) != 0) { 1445 maybe_warn("failed outfile fclose"); 1446 unlink(outfile); 1447 goto lose; 1448 } 1449 } else 1450 #endif 1451 1452 #ifndef NO_PACK_SUPPORT 1453 if (method == FT_PACK) { 1454 if (lflag) { 1455 maybe_warnx("no -l with packed files"); 1456 goto lose; 1457 } 1458 1459 size = unpack(fd, zfd, NULL, 0, NULL); 1460 } else 1461 #endif 1462 1463 #ifndef SMALL 1464 if (method == FT_UNKNOWN) { 1465 if (lflag) { 1466 maybe_warnx("no -l for unknown filetypes"); 1467 goto lose; 1468 } 1469 size = cat_fd(NULL, 0, NULL, fd); 1470 } else 1471 #endif 1472 { 1473 if (lflag) { 1474 print_list(fd, isb.st_size, outfile, isb.st_mtime); 1475 close(fd); 1476 return -1; /* XXX */ 1477 } 1478 1479 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file); 1480 } 1481 1482 if (close(fd) != 0) 1483 maybe_warn("couldn't close input"); 1484 if (zfd != STDOUT_FILENO && close(zfd) != 0) 1485 maybe_warn("couldn't close output"); 1486 1487 if (size == -1) { 1488 if (cflag == 0) 1489 unlink(outfile); 1490 maybe_warnx("%s: uncompress failed", file); 1491 return -1; 1492 } 1493 1494 /* if testing, or we uncompressed to stdout, this is all we need */ 1495 #ifndef SMALL 1496 if (tflag) 1497 return size; 1498 #endif 1499 /* if we are uncompressing to stdin, don't remove the file. */ 1500 if (cflag) 1501 return size; 1502 1503 /* 1504 * if we create a file... 1505 */ 1506 /* 1507 * if we can't stat the file don't remove the file. 1508 */ 1509 1510 ofd = open(outfile, O_RDWR, 0); 1511 if (ofd == -1) { 1512 maybe_warn("couldn't open (leaving original): %s", 1513 outfile); 1514 return -1; 1515 } 1516 if (fstat(ofd, &osb) != 0) { 1517 maybe_warn("couldn't stat (leaving original): %s", 1518 outfile); 1519 close(ofd); 1520 return -1; 1521 } 1522 if (osb.st_size != size) { 1523 maybe_warnx("stat gave different size: %" PRIdOFF 1524 " != %" PRIdOFF " (leaving original)", 1525 size, osb.st_size); 1526 close(ofd); 1527 unlink(outfile); 1528 return -1; 1529 } 1530 unlink_input(file, &isb); 1531 #ifndef SMALL 1532 copymodes(ofd, &isb, outfile); 1533 #endif 1534 close(ofd); 1535 return size; 1536 1537 unexpected_EOF: 1538 maybe_warnx("%s: unexpected end of file", file); 1539 lose: 1540 if (fd != -1) 1541 close(fd); 1542 if (zfd != -1 && zfd != STDOUT_FILENO) 1543 close(fd); 1544 return -1; 1545 } 1546 1547 #ifndef SMALL 1548 static off_t 1549 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd) 1550 { 1551 char buf[BUFLEN]; 1552 off_t in_tot; 1553 ssize_t w; 1554 1555 in_tot = count; 1556 w = write(STDOUT_FILENO, prepend, count); 1557 if (w == -1 || (size_t)w != count) { 1558 maybe_warn("write to stdout"); 1559 return -1; 1560 } 1561 for (;;) { 1562 ssize_t rv; 1563 1564 rv = read(fd, buf, sizeof buf); 1565 if (rv == 0) 1566 break; 1567 if (rv < 0) { 1568 maybe_warn("read from fd %d", fd); 1569 break; 1570 } 1571 1572 if (write(STDOUT_FILENO, buf, rv) != rv) { 1573 maybe_warn("write to stdout"); 1574 break; 1575 } 1576 in_tot += rv; 1577 } 1578 1579 if (gsizep) 1580 *gsizep = in_tot; 1581 return (in_tot); 1582 } 1583 #endif 1584 1585 static void 1586 handle_stdin(void) 1587 { 1588 unsigned char header1[4]; 1589 off_t usize, gsize; 1590 enum filetype method; 1591 ssize_t bytes_read; 1592 #ifndef NO_COMPRESS_SUPPORT 1593 FILE *in; 1594 #endif 1595 1596 #ifndef SMALL 1597 if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) { 1598 maybe_warnx("standard input is a terminal -- ignoring"); 1599 return; 1600 } 1601 #endif 1602 1603 if (lflag) { 1604 struct stat isb; 1605 1606 /* XXX could read the whole file, etc. */ 1607 if (fstat(STDIN_FILENO, &isb) < 0) { 1608 maybe_warn("fstat"); 1609 return; 1610 } 1611 print_list(STDIN_FILENO, isb.st_size, "stdout", isb.st_mtime); 1612 return; 1613 } 1614 1615 bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1); 1616 if (bytes_read == -1) { 1617 maybe_warn("can't read stdin"); 1618 return; 1619 } else if (bytes_read != sizeof(header1)) { 1620 maybe_warnx("(stdin): unexpected end of file"); 1621 return; 1622 } 1623 1624 method = file_gettype(header1); 1625 switch (method) { 1626 default: 1627 #ifndef SMALL 1628 if (fflag == 0) { 1629 maybe_warnx("unknown compression format"); 1630 return; 1631 } 1632 usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO); 1633 break; 1634 #endif 1635 case FT_GZIP: 1636 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO, 1637 header1, sizeof header1, &gsize, "(stdin)"); 1638 break; 1639 #ifndef NO_BZIP2_SUPPORT 1640 case FT_BZIP2: 1641 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO, 1642 header1, sizeof header1, &gsize); 1643 break; 1644 #endif 1645 #ifndef NO_COMPRESS_SUPPORT 1646 case FT_Z: 1647 if ((in = zdopen(STDIN_FILENO)) == NULL) { 1648 maybe_warnx("zopen of stdin"); 1649 return; 1650 } 1651 1652 usize = zuncompress(in, stdout, header1, sizeof header1, &gsize); 1653 fclose(in); 1654 break; 1655 #endif 1656 #ifndef NO_PACK_SUPPORT 1657 case FT_PACK: 1658 usize = unpack(STDIN_FILENO, STDOUT_FILENO, 1659 (char *)header1, sizeof header1, &gsize); 1660 break; 1661 #endif 1662 } 1663 1664 #ifndef SMALL 1665 if (vflag && !tflag && usize != -1 && gsize != -1) 1666 print_verbage(NULL, NULL, usize, gsize); 1667 if (vflag && tflag) 1668 print_test("(stdin)", usize != -1); 1669 #endif 1670 1671 } 1672 1673 static void 1674 handle_stdout(void) 1675 { 1676 off_t gsize, usize; 1677 struct stat sb; 1678 time_t systime; 1679 uint32_t mtime; 1680 int ret; 1681 1682 #ifndef SMALL 1683 if (fflag == 0 && isatty(STDOUT_FILENO)) { 1684 maybe_warnx("standard output is a terminal -- ignoring"); 1685 return; 1686 } 1687 #endif 1688 /* If stdin is a file use it's mtime, otherwise use current time */ 1689 ret = fstat(STDIN_FILENO, &sb); 1690 1691 #ifndef SMALL 1692 if (ret < 0) { 1693 maybe_warn("Can't stat stdin"); 1694 return; 1695 } 1696 #endif 1697 1698 if (S_ISREG(sb.st_mode)) 1699 mtime = (uint32_t)sb.st_mtime; 1700 else { 1701 systime = time(NULL); 1702 #ifndef SMALL 1703 if (systime == -1) { 1704 maybe_warn("time"); 1705 return; 1706 } 1707 #endif 1708 mtime = (uint32_t)systime; 1709 } 1710 1711 usize = gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime); 1712 #ifndef SMALL 1713 if (vflag && !tflag && usize != -1 && gsize != -1) 1714 print_verbage(NULL, NULL, usize, gsize); 1715 #endif 1716 } 1717 1718 /* do what is asked for, for the path name */ 1719 static void 1720 handle_pathname(char *path) 1721 { 1722 char *opath = path, *s = NULL; 1723 ssize_t len; 1724 int slen; 1725 struct stat sb; 1726 1727 /* check for stdout/stdin */ 1728 if (path[0] == '-' && path[1] == '\0') { 1729 if (dflag) 1730 handle_stdin(); 1731 else 1732 handle_stdout(); 1733 return; 1734 } 1735 1736 retry: 1737 if (stat(path, &sb) != 0) { 1738 /* lets try <path>.gz if we're decompressing */ 1739 if (dflag && s == NULL && errno == ENOENT) { 1740 len = strlen(path); 1741 slen = suffixes[0].ziplen; 1742 s = malloc(len + slen + 1); 1743 if (s == NULL) 1744 maybe_err("malloc"); 1745 memcpy(s, path, len); 1746 memcpy(s + len, suffixes[0].zipped, slen + 1); 1747 path = s; 1748 goto retry; 1749 } 1750 maybe_warn("can't stat: %s", opath); 1751 goto out; 1752 } 1753 1754 if (S_ISDIR(sb.st_mode)) { 1755 #ifndef SMALL 1756 if (rflag) 1757 handle_dir(path); 1758 else 1759 #endif 1760 maybe_warnx("%s is a directory", path); 1761 goto out; 1762 } 1763 1764 if (S_ISREG(sb.st_mode)) 1765 handle_file(path, &sb); 1766 else 1767 maybe_warnx("%s is not a regular file", path); 1768 1769 out: 1770 if (s) 1771 free(s); 1772 } 1773 1774 /* compress/decompress a file */ 1775 static void 1776 handle_file(char *file, struct stat *sbp) 1777 { 1778 off_t usize, gsize; 1779 char outfile[PATH_MAX]; 1780 1781 infile = file; 1782 if (dflag) { 1783 usize = file_uncompress(file, outfile, sizeof(outfile)); 1784 #ifndef SMALL 1785 if (vflag && tflag) 1786 print_test(file, usize != -1); 1787 #endif 1788 if (usize == -1) 1789 return; 1790 gsize = sbp->st_size; 1791 } else { 1792 gsize = file_compress(file, outfile, sizeof(outfile)); 1793 if (gsize == -1) 1794 return; 1795 usize = sbp->st_size; 1796 } 1797 1798 1799 #ifndef SMALL 1800 if (vflag && !tflag) 1801 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize); 1802 #endif 1803 } 1804 1805 #ifndef SMALL 1806 /* this is used with -r to recursively descend directories */ 1807 static void 1808 handle_dir(char *dir) 1809 { 1810 char *path_argv[2]; 1811 FTS *fts; 1812 FTSENT *entry; 1813 1814 path_argv[0] = dir; 1815 path_argv[1] = 0; 1816 fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL); 1817 if (fts == NULL) { 1818 warn("couldn't fts_open %s", dir); 1819 return; 1820 } 1821 1822 while ((entry = fts_read(fts))) { 1823 switch(entry->fts_info) { 1824 case FTS_D: 1825 case FTS_DP: 1826 continue; 1827 1828 case FTS_DNR: 1829 case FTS_ERR: 1830 case FTS_NS: 1831 maybe_warn("%s", entry->fts_path); 1832 continue; 1833 case FTS_F: 1834 handle_file(entry->fts_path, entry->fts_statp); 1835 } 1836 } 1837 (void)fts_close(fts); 1838 } 1839 #endif 1840 1841 /* print a ratio - size reduction as a fraction of uncompressed size */ 1842 static void 1843 print_ratio(off_t in, off_t out, FILE *where) 1844 { 1845 int percent10; /* 10 * percent */ 1846 off_t diff; 1847 char buff[8]; 1848 int len; 1849 1850 diff = in - out/2; 1851 if (diff <= 0) 1852 /* 1853 * Output is more than double size of input! print -99.9% 1854 * Quite possibly we've failed to get the original size. 1855 */ 1856 percent10 = -999; 1857 else { 1858 /* 1859 * We only need 12 bits of result from the final division, 1860 * so reduce the values until a 32bit division will suffice. 1861 */ 1862 while (in > 0x100000) { 1863 diff >>= 1; 1864 in >>= 1; 1865 } 1866 if (in != 0) 1867 percent10 = ((u_int)diff * 2000) / (u_int)in - 1000; 1868 else 1869 percent10 = 0; 1870 } 1871 1872 len = snprintf(buff, sizeof buff, "%2.2d.", percent10); 1873 /* Move the '.' to before the last digit */ 1874 buff[len - 1] = buff[len - 2]; 1875 buff[len - 2] = '.'; 1876 fprintf(where, "%5s%%", buff); 1877 } 1878 1879 #ifndef SMALL 1880 /* print compression statistics, and the new name (if there is one!) */ 1881 static void 1882 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize) 1883 { 1884 if (file) 1885 fprintf(stderr, "%s:%s ", file, 1886 strlen(file) < 7 ? "\t\t" : "\t"); 1887 print_ratio(usize, gsize, stderr); 1888 if (nfile) 1889 fprintf(stderr, " -- replaced with %s", nfile); 1890 fprintf(stderr, "\n"); 1891 fflush(stderr); 1892 } 1893 1894 /* print test results */ 1895 static void 1896 print_test(const char *file, int ok) 1897 { 1898 1899 if (exit_value == 0 && ok == 0) 1900 exit_value = 1; 1901 fprintf(stderr, "%s:%s %s\n", file, 1902 strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK"); 1903 fflush(stderr); 1904 } 1905 #endif 1906 1907 /* print a file's info ala --list */ 1908 /* eg: 1909 compressed uncompressed ratio uncompressed_name 1910 354841 1679360 78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar 1911 */ 1912 static void 1913 print_list(int fd, off_t out, const char *outfile, time_t ts) 1914 { 1915 static int first = 1; 1916 #ifndef SMALL 1917 static off_t in_tot, out_tot; 1918 uint32_t crc = 0; 1919 #endif 1920 off_t in = 0, rv; 1921 1922 if (first) { 1923 #ifndef SMALL 1924 if (vflag) 1925 printf("method crc date time "); 1926 #endif 1927 if (qflag == 0) 1928 printf(" compressed uncompressed " 1929 "ratio uncompressed_name\n"); 1930 } 1931 first = 0; 1932 1933 /* print totals? */ 1934 #ifndef SMALL 1935 if (fd == -1) { 1936 in = in_tot; 1937 out = out_tot; 1938 } else 1939 #endif 1940 { 1941 /* read the last 4 bytes - this is the uncompressed size */ 1942 rv = lseek(fd, (off_t)(-8), SEEK_END); 1943 if (rv != -1) { 1944 unsigned char buf[8]; 1945 uint32_t usize; 1946 1947 rv = read(fd, (char *)buf, sizeof(buf)); 1948 if (rv == -1) 1949 maybe_warn("read of uncompressed size"); 1950 else if (rv != sizeof(buf)) 1951 maybe_warnx("read of uncompressed size"); 1952 1953 else { 1954 usize = buf[4] | buf[5] << 8 | 1955 buf[6] << 16 | buf[7] << 24; 1956 in = (off_t)usize; 1957 #ifndef SMALL 1958 crc = buf[0] | buf[1] << 8 | 1959 buf[2] << 16 | buf[3] << 24; 1960 #endif 1961 } 1962 } 1963 } 1964 1965 #ifndef SMALL 1966 if (vflag && fd == -1) 1967 printf(" "); 1968 else if (vflag) { 1969 char *date = ctime(&ts); 1970 1971 /* skip the day, 1/100th second, and year */ 1972 date += 4; 1973 date[12] = 0; 1974 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date); 1975 } 1976 in_tot += in; 1977 out_tot += out; 1978 #endif 1979 printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in); 1980 print_ratio(in, out, stdout); 1981 printf(" %s\n", outfile); 1982 } 1983 1984 /* display the usage of NetBSD gzip */ 1985 static void 1986 usage(void) 1987 { 1988 1989 fprintf(stderr, "%s\n", gzip_version); 1990 fprintf(stderr, 1991 #ifdef SMALL 1992 "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n", 1993 #else 1994 "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n" 1995 " -1 --fast fastest (worst) compression\n" 1996 " -2 .. -8 set compression level\n" 1997 " -9 --best best (slowest) compression\n" 1998 " -c --stdout write to stdout, keep original files\n" 1999 " --to-stdout\n" 2000 " -d --decompress uncompress files\n" 2001 " --uncompress\n" 2002 " -f --force force overwriting & compress links\n" 2003 " -h --help display this help\n" 2004 " -k --keep don't delete input files during operation\n" 2005 " -l --list list compressed file contents\n" 2006 " -N --name save or restore original file name and time stamp\n" 2007 " -n --no-name don't save original file name or time stamp\n" 2008 " -q --quiet output no warnings\n" 2009 " -r --recursive recursively compress files in directories\n" 2010 " -S .suf use suffix .suf instead of .gz\n" 2011 " --suffix .suf\n" 2012 " -t --test test compressed file\n" 2013 " -V --version display program version\n" 2014 " -v --verbose print extra statistics\n", 2015 #endif 2016 getprogname()); 2017 exit(0); 2018 } 2019 2020 /* display the version of NetBSD gzip */ 2021 static void 2022 display_version(void) 2023 { 2024 2025 fprintf(stderr, "%s\n", gzip_version); 2026 exit(0); 2027 } 2028 2029 #ifndef NO_BZIP2_SUPPORT 2030 #include "unbzip2.c" 2031 #endif 2032 #ifndef NO_COMPRESS_SUPPORT 2033 #include "zuncompress.c" 2034 #endif 2035 #ifndef NO_PACK_SUPPORT 2036 #include "unpack.c" 2037 #endif 2038 2039 static ssize_t 2040 read_retry(int fd, void *buf, size_t sz) 2041 { 2042 char *cp = buf; 2043 size_t left = MIN(sz, (size_t) SSIZE_MAX); 2044 2045 while (left > 0) { 2046 ssize_t ret; 2047 2048 ret = read(fd, cp, left); 2049 if (ret == -1) { 2050 return ret; 2051 } else if (ret == 0) { 2052 break; /* EOF */ 2053 } 2054 cp += ret; 2055 left -= ret; 2056 } 2057 2058 return sz - left; 2059 } 2060