usr.bin/gzip/gzip.c

   1 /*      $NetBSD: gzip.c,v 1.67 2004/09/11 11:07:44 dsl 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 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  * 3. The name of the author may not be used to endorse or promote products
  17  *    derived from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * gzip.c -- GPL free gzip using zlib.
  34  *
  35  * RFC 1950 covers the zlib format
  36  * RFC 1951 covers the deflate format
  37  * RFC 1952 covers the gzip format
  38  *
  39  * TODO:
  40  *      - use mmap where possible
  41  *      - handle some signals better (remove outfile?)
  42  *      - make bzip2/compress -v/-t/-l support work as well as possible
  43  */
  44
  45 #include <sys/param.h>
  46 #include <sys/stat.h>
  47 #include <sys/time.h>
  48
  49 #include <err.h>
  50 #include <errno.h>
  51 #include <fcntl.h>
  52 #include <fts.h>
  53 #include <getopt.h>
  54 #include <inttypes.h>
  55 #include <libgen.h>
  56 #include <stdarg.h>
  57 #include <stdio.h>
  58 #include <stdlib.h>
  59 #include <string.h>
  60 #include <unistd.h>
  61 #include <zlib.h>
  62
  63 #ifndef PRIdOFF
  64 #define PRIdOFF PRId64
  65 #endif
  66
  67 #ifndef PRId64
  68 #define PRId64 "lld"
  69 #endif
  70
  71 /* what type of file are we dealing with */
  72 enum filetype {
  73         FT_GZIP,
  74 #ifndef NO_BZIP2_SUPPORT
  75         FT_BZIP2,
  76 #endif
  77 #ifndef NO_COMPRESS_SUPPORT
  78         FT_Z,
  79 #endif
  80         FT_LAST,
  81         FT_UNKNOWN
  82 };
  83
  84 #ifndef NO_BZIP2_SUPPORT
  85 #include <bzlib.h>
  86
  87 #define BZ2_SUFFIX      ".bz2"
  88 #define BZIP2_MAGIC     "\102\132\150"
  89 #endif
  90
  91 #ifndef NO_COMPRESS_SUPPORT
  92 #define Z_SUFFIX        ".Z"
  93 #define Z_MAGIC         "\037\235"
  94 #endif
  95
  96 #define GZ_SUFFIX       ".gz"
  97
  98 #define BUFLEN          (64 * 1024)
  99
 100 #define GZIP_MAGIC0     0x1F
 101 #define GZIP_MAGIC1     0x8B
 102 #define GZIP_OMAGIC1    0x9E
 103
 104 #define GZIP_TIMESTAMP  (off_t)4
 105 #define GZIP_ORIGNAME   (off_t)10
 106
 107 #define HEAD_CRC        0x02
 108 #define EXTRA_FIELD     0x04
 109 #define ORIG_NAME       0x08
 110 #define COMMENT         0x10
 111
 112 #define OS_CODE         3       /* Unix */
 113
 114 typedef struct {
 115     const char  *zipped;
 116     int         ziplen;
 117     const char  *normal;        /* for unzip - must not be longer than zipped */
 118 } suffixes_t;
 119 static suffixes_t suffixes[] = {
 120 #define SUFFIX(Z, N) {Z, sizeof Z - 1, N}
 121         SUFFIX(GZ_SUFFIX,       ""),    /* Overwritten by -S .xxx */
 122 #ifndef SMALL
 123         SUFFIX(GZ_SUFFIX,       ""),
 124         SUFFIX(".z",            ""),
 125         SUFFIX("-gz",           ""),
 126         SUFFIX("-z",            ""),
 127         SUFFIX("_z",            ""),
 128         SUFFIX(".taz",          ".tar"),
 129         SUFFIX(".tgz",          ".tar"),
 130 #ifndef NO_BZIP2_SUPPORT
 131         SUFFIX(BZ2_SUFFIX,      ""),
 132 #endif
 133 #ifndef NO_COMPRESS_SUPPORT
 134         SUFFIX(Z_SUFFIX,        ""),
 135 #endif
 136         SUFFIX(GZ_SUFFIX,       ""),    /* Overwritten by -S "" */
 137 #endif /* SMALL */
 138 #undef SUFFIX
 139 };
 140 #define NUM_SUFFIXES (sizeof suffixes / sizeof suffixes[0])
 141
 142 static  const char      gzip_version[] = "NetBSD gzip 20040830";
 143
 144 static  int     cflag;                  /* stdout mode */
 145 static  int     dflag;                  /* decompress mode */
 146 static  int     lflag;                  /* list mode */
 147 static  int     numflag = 6;            /* gzip -1..-9 value */
 148
 149 #ifndef SMALL
 150 static  int     fflag;                  /* force mode */
 151 static  int     kflag;                  /* don't delete input files */
 152 static  int     nflag;                  /* don't save name/timestamp */
 153 static  int     Nflag;                  /* don't restore name/timestamp */
 154 static  int     qflag;                  /* quiet mode */
 155 static  int     rflag;                  /* recursive mode */
 156 static  int     tflag;                  /* test */
 157 static  int     vflag;                  /* verbose mode */
 158 #else
 159 #define         qflag   0
 160 #define         tflag   0
 161 #endif
 162
 163 static  int     exit_value = 0;         /* exit value */
 164
 165 static  char    *infile;                /* name of file coming in */
 166
 167 static  void    maybe_err(const char *fmt, ...)
 168     __attribute__((__format__(__printf__, 1, 2)));
 169 #ifndef NO_BZIP2_SUPPORT
 170 static  void    maybe_errx(const char *fmt, ...)
 171     __attribute__((__format__(__printf__, 1, 2)));
 172 #endif
 173 static  void    maybe_warn(const char *fmt, ...)
 174     __attribute__((__format__(__printf__, 1, 2)));
 175 static  void    maybe_warnx(const char *fmt, ...)
 176     __attribute__((__format__(__printf__, 1, 2)));
 177 static  enum filetype file_gettype(u_char *);
 178 #ifdef SMALL
 179 #define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz)
 180 #endif
 181 static  off_t   gz_compress(int, int, off_t *, const char *, uint32_t);
 182 static  off_t   gz_uncompress(int, int, char *, size_t, off_t *, const char *);
 183 static  off_t   file_compress(char *, char *, size_t);
 184 static  off_t   file_uncompress(char *, char *, size_t);
 185 static  void    handle_pathname(char *);
 186 static  void    handle_file(char *, struct stat *);
 187 static  void    handle_stdin(void);
 188 static  void    handle_stdout(void);
 189 static  void    print_ratio(off_t, off_t, FILE *);
 190 static  void    print_list(int fd, off_t, const char *, time_t);
 191 static  void    usage(void);
 192 static  void    display_version(void);
 193 static  const suffixes_t *check_suffix(char *, int);
 194
 195 #ifdef SMALL
 196 #define unlink_input(f, sb) unlink(f)
 197 #else
 198 static  off_t   cat_fd(unsigned char *, ssize_t, off_t *, int fd);
 199 static  void    prepend_gzip(char *, int *, char ***);
 200 static  void    handle_dir(char *);
 201 static  void    print_verbage(const char *, const char *, off_t, off_t);
 202 static  void    print_test(const char *, int);
 203 static  void    copymodes(const char *, struct stat *);
 204 static  int     check_outfile(const char *outfile, struct stat *sb);
 205 #endif
 206
 207 #ifndef NO_BZIP2_SUPPORT
 208 static  off_t   unbzip2(int, int, char *, size_t, off_t *);
 209 #endif
 210
 211 #ifndef NO_COMPRESS_SUPPORT
 212 static  FILE    *zdopen(int);
 213 static  off_t   zuncompress(FILE *, FILE *, char *, size_t, off_t *);
 214 #endif
 215
 216 int main(int, char *p[]);
 217
 218 #ifdef SMALL
 219 #define getopt_long(a,b,c,d,e) getopt(a,b,c)
 220 #else
 221 static const struct option longopts[] = {
 222         { "stdout",             no_argument,            0,      'c' },
 223         { "to-stdout",          no_argument,            0,      'c' },
 224         { "decompress",         no_argument,            0,      'd' },
 225         { "uncompress",         no_argument,            0,      'd' },
 226         { "force",              no_argument,            0,      'f' },
 227         { "help",               no_argument,            0,      'h' },
 228         { "keep",               no_argument,            0,      'k' },
 229         { "list",               no_argument,            0,      'l' },
 230         { "no-name",            no_argument,            0,      'n' },
 231         { "name",               no_argument,            0,      'N' },
 232         { "quiet",              no_argument,            0,      'q' },
 233         { "recursive",          no_argument,            0,      'r' },
 234         { "suffix",             required_argument,      0,      'S' },
 235         { "test",               no_argument,            0,      't' },
 236         { "verbose",            no_argument,            0,      'v' },
 237         { "version",            no_argument,            0,      'V' },
 238         { "fast",               no_argument,            0,      '1' },
 239         { "best",               no_argument,            0,      '9' },
 240 #if 0
 241         /*
 242          * This is what else GNU gzip implements.  --ascii isn't useful
 243          * on NetBSD, and I don't care to have a --license.
 244          */
 245         { "ascii",              no_argument,            0,      'a' },
 246         { "license",            no_argument,            0,      'L' },
 247 #endif
 248         { NULL,                 no_argument,            0,      0 },
 249 };
 250 #endif
 251
 252 int
 253 main(int argc, char **argv)
 254 {
 255         const char *progname = getprogname();
 256 #ifndef SMALL
 257         char *gzip;
 258         int len;
 259 #endif
 260         int ch;
 261
 262         /* XXX set up signals */
 263
 264 #ifndef SMALL
 265         if ((gzip = getenv("GZIP")) != NULL)
 266                 prepend_gzip(gzip, &argc, &argv);
 267 #endif
 268
 269         /*
 270          * XXX
 271          * handle being called `gunzip', `zcat' and `gzcat'
 272          */
 273         if (strcmp(progname, "gunzip") == 0)
 274                 dflag = 1;
 275         else if (strcmp(progname, "zcat") == 0 ||
 276                  strcmp(progname, "gzcat") == 0)
 277                 dflag = cflag = 1;
 278
 279 #ifdef SMALL
 280 #define OPT_LIST "cdhHltV123456789"
 281 #else
 282 #define OPT_LIST "cdfhHklnNqrS:tvV123456789"
 283 #endif
 284
 285         while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) {
 286                 switch (ch) {
 287                 case 'c':
 288                         cflag = 1;
 289                         break;
 290                 case 'd':
 291                         dflag = 1;
 292                         break;
 293                 case 'l':
 294                         lflag = 1;
 295                         dflag = 1;
 296                         break;
 297                 case 'V':
 298                         display_version();
 299                         /* NOTREACHED */
 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 #ifndef SMALL
 306                 case 'f':
 307                         fflag = 1;
 308                         break;
 309                 case 'k':
 310                         kflag = 1;
 311                         break;
 312                 case 'n':
 313                         nflag = 1;
 314                         Nflag = 0;
 315                         break;
 316                 case 'N':
 317                         nflag = 0;
 318                         Nflag = 1;
 319                         break;
 320                 case 'q':
 321                         qflag = 1;
 322                         break;
 323                 case 'r':
 324                         rflag = 1;
 325                         break;
 326                 case 'S':
 327                         len = strlen(optarg);
 328                         if (len != 0) {
 329                                 suffixes[0].zipped = optarg;
 330                                 suffixes[0].ziplen = len;
 331                         } else {
 332                                 suffixes[NUM_SUFFIXES - 1].zipped = "";
 333                                 suffixes[NUM_SUFFIXES - 1].ziplen = 0;
 334                         }
 335                         break;
 336                 case 't':
 337                         cflag = 1;
 338                         tflag = 1;
 339                         dflag = 1;
 340                         break;
 341                 case 'v':
 342                         vflag = 1;
 343                         break;
 344 #endif
 345                 default:
 346                         usage();
 347                         /* NOTREACHED */
 348                 }
 349         }
 350         argv += optind;
 351         argc -= optind;
 352
 353         if (argc == 0) {
 354                 if (dflag)      /* stdin mode */
 355                         handle_stdin();
 356                 else            /* stdout mode */
 357                         handle_stdout();
 358         } else {
 359                 do {
 360                         handle_pathname(argv[0]);
 361                 } while (*++argv);
 362         }
 363 #ifndef SMALL
 364         if (qflag == 0 && lflag && argc > 1)
 365                 print_list(-1, 0, "(totals)", 0);
 366 #endif
 367         exit(exit_value);
 368 }
 369
 370 /* maybe print a warning */
 371 void
 372 maybe_warn(const char *fmt, ...)
 373 {
 374         va_list ap;
 375
 376         if (qflag == 0) {
 377                 va_start(ap, fmt);
 378                 vwarn(fmt, ap);
 379                 va_end(ap);
 380         }
 381         if (exit_value == 0)
 382                 exit_value = 1;
 383 }
 384
 385 /* ... without an errno. */
 386 void
 387 maybe_warnx(const char *fmt, ...)
 388 {
 389         va_list ap;
 390
 391         if (qflag == 0) {
 392                 va_start(ap, fmt);
 393                 vwarnx(fmt, ap);
 394                 va_end(ap);
 395         }
 396         if (exit_value == 0)
 397                 exit_value = 1;
 398 }
 399
 400 /* maybe print an error */
 401 void
 402 maybe_err(const char *fmt, ...)
 403 {
 404         va_list ap;
 405
 406         if (qflag == 0) {
 407                 va_start(ap, fmt);
 408                 vwarn(fmt, ap);
 409                 va_end(ap);
 410         }
 411         exit(2);
 412 }
 413
 414 #ifndef NO_BZIP2_SUPPORT
 415 /* ... without an errno. */
 416 void
 417 maybe_errx(const char *fmt, ...)
 418 {
 419         va_list ap;
 420
 421         if (qflag == 0) {
 422                 va_start(ap, fmt);
 423                 vwarnx(fmt, ap);
 424                 va_end(ap);
 425         }
 426         exit(2);
 427 }
 428 #endif
 429
 430 #ifndef SMALL
 431 /* split up $GZIP and prepend it to the argument list */
 432 static void
 433 prepend_gzip(char *gzip, int *argc, char ***argv)
 434 {
 435         char *s, **nargv, **ac;
 436         int nenvarg = 0, i;
 437
 438         /* scan how many arguments there are */
 439         for (s = gzip;;) {
 440                 while (*s == ' ' || *s == '\t')
 441                         s++;
 442                 if (*s == 0)
 443                         goto count_done;
 444                 nenvarg++;
 445                 while (*s != ' ' && *s != '\t')
 446                         if (*s++ == 0)
 447                                 goto count_done;
 448         }
 449 count_done:
 450         /* punt early */
 451         if (nenvarg == 0)
 452                 return;
 453
 454         *argc += nenvarg;
 455         ac = *argv;
 456
 457         nargv = (char **)malloc((*argc + 1) * sizeof(char *));
 458         if (nargv == NULL)
 459                 maybe_err("malloc");
 460
 461         /* stash this away */
 462         *argv = nargv;
 463
 464         /* copy the program name first */
 465         i = 0;
 466         nargv[i++] = *(ac++);
 467
 468         /* take a copy of $GZIP and add it to the array */
 469         s = strdup(gzip);
 470         if (s == NULL)
 471                 maybe_err("strdup");
 472         for (;;) {
 473                 /* Skip whitespaces. */
 474                 while (*s == ' ' || *s == '\t')
 475                         s++;
 476                 if (*s == 0)
 477                         goto copy_done;
 478                 nargv[i++] = s;
 479                 /* Find the end of this argument. */
 480                 while (*s != ' ' && *s != '\t')
 481                         if (*s++ == 0)
 482                                 /* Argument followed by NUL. */
 483                                 goto copy_done;
 484                 /* Terminate by overwriting ' ' or '\t' with NUL. */
 485                 *s++ = 0;
 486         }
 487 copy_done:
 488
 489         /* copy the original arguments and a NULL */
 490         while (*ac)
 491                 nargv[i++] = *(ac++);
 492         nargv[i] = NULL;
 493 }
 494 #endif
 495
 496 /* compress input to output. Return bytes read, -1 on error */
 497 static off_t
 498 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime)
 499 {
 500         z_stream z;
 501         char *outbufp, *inbufp;
 502         off_t in_tot = 0, out_tot = 0;
 503         ssize_t in_size;
 504         int i, error;
 505         uLong crc;
 506 #ifdef SMALL
 507         static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0,
 508                                  0, 0, 0, 0,
 509                                  0, OS_CODE };
 510 #endif
 511
 512         outbufp = malloc(BUFLEN);
 513         inbufp = malloc(BUFLEN);
 514         if (outbufp == NULL || inbufp == NULL) {
 515                 maybe_err("malloc failed");
 516                 goto out;
 517         }
 518
 519         memset(&z, 0, sizeof z);
 520         z.zalloc = Z_NULL;
 521         z.zfree = Z_NULL;
 522         z.opaque = 0;
 523
 524 #ifdef SMALL
 525         memcpy(outbufp, header, sizeof header);
 526         i = sizeof header;
 527 #else
 528         if (nflag != 0) {
 529                 mtime = 0;
 530                 origname = "";
 531         }
 532
 533         i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s",
 534                      GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED,
 535                      *origname ? ORIG_NAME : 0,
 536                      mtime & 0xff,
 537                      (mtime >> 8) & 0xff,
 538                      (mtime >> 16) & 0xff,
 539                      (mtime >> 24) & 0xff,
 540                      numflag == 1 ? 4 : numflag == 9 ? 2 : 0,
 541                      OS_CODE, origname);
 542         if (i >= BUFLEN)
 543                 /* this need PATH_MAX > BUFLEN ... */
 544                 maybe_err("snprintf");
 545         if (*origname)
 546                 i++;
 547 #endif
 548
 549         z.next_out = outbufp + i;
 550         z.avail_out = BUFLEN - i;
 551
 552         error = deflateInit2(&z, numflag, Z_DEFLATED,
 553                              -MAX_WBITS, 8, Z_DEFAULT_STRATEGY);
 554         if (error != Z_OK) {
 555                 maybe_warnx("deflateInit2 failed");
 556                 in_tot = -1;
 557                 goto out;
 558         }
 559
 560         crc = crc32(0L, Z_NULL, 0);
 561         for (;;) {
 562                 if (z.avail_out == 0) {
 563                         if (write(out, outbufp, BUFLEN) != BUFLEN) {
 564                                 maybe_warn("write");
 565                                 in_tot = -1;
 566                                 goto out;
 567                         }
 568
 569                         out_tot += BUFLEN;
 570                         z.next_out = outbufp;
 571                         z.avail_out = BUFLEN;
 572                 }
 573
 574                 if (z.avail_in == 0) {
 575                         in_size = read(in, inbufp, BUFLEN);
 576                         if (in_size < 0) {
 577                                 maybe_warn("read");
 578                                 in_tot = -1;
 579                                 goto out;
 580                         }
 581                         if (in_size == 0)
 582                                 break;
 583
 584                         crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size);
 585                         in_tot += in_size;
 586                         z.next_in = inbufp;
 587                         z.avail_in = in_size;
 588                 }
 589
 590                 error = deflate(&z, Z_NO_FLUSH);
 591                 if (error != Z_OK && error != Z_STREAM_END) {
 592                         maybe_warnx("deflate failed");
 593                         in_tot = -1;
 594                         goto out;
 595                 }
 596         }
 597
 598         /* clean up */
 599         for (;;) {
 600                 ssize_t len;
 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                 if (write(out, outbufp, len) != len) {
 612                         maybe_warn("write");
 613                         out_tot = -1;
 614                         goto out;
 615                 }
 616                 out_tot += len;
 617                 z.next_out = outbufp;
 618                 z.avail_out = BUFLEN;
 619
 620                 if (error == Z_STREAM_END)
 621                         break;
 622         }
 623
 624         if (deflateEnd(&z) != Z_OK) {
 625                 maybe_warnx("deflateEnd failed");
 626                 in_tot = -1;
 627                 goto out;
 628         }
 629
 630         i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c",
 631                  (int)crc & 0xff,
 632                  (int)(crc >> 8) & 0xff,
 633                  (int)(crc >> 16) & 0xff,
 634                  (int)(crc >> 24) & 0xff,
 635                  (int)in_tot & 0xff,
 636                  (int)(in_tot >> 8) & 0xff,
 637                  (int)(in_tot >> 16) & 0xff,
 638                  (int)(in_tot >> 24) & 0xff);
 639         if (i != 8)
 640                 maybe_err("snprintf");
 641         if (write(out, outbufp, i) != i) {
 642                 maybe_warn("write");
 643                 in_tot = -1;
 644         } else
 645                 out_tot += i;
 646
 647 out:
 648         if (inbufp != NULL)
 649                 free(inbufp);
 650         if (outbufp != NULL)
 651                 free(outbufp);
 652         if (gsizep)
 653                 *gsizep = out_tot;
 654         return in_tot;
 655 }
 656
 657 /*
 658  * uncompress input to output then close the input.  return the
 659  * uncompressed size written, and put the compressed sized read
 660  * into `*gsizep'.
 661  */
 662 static off_t
 663 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
 664               const char *filename)
 665 {
 666         z_stream z;
 667         char *outbufp, *inbufp;
 668         off_t out_tot = prelen, in_tot = 0;
 669         uint32_t out_sub_tot = 0;
 670         enum {
 671                 GZSTATE_MAGIC0,
 672                 GZSTATE_MAGIC1,
 673                 GZSTATE_METHOD,
 674                 GZSTATE_FLAGS,
 675                 GZSTATE_SKIPPING,
 676                 GZSTATE_EXTRA,
 677                 GZSTATE_EXTRA2,
 678                 GZSTATE_EXTRA3,
 679                 GZSTATE_ORIGNAME,
 680                 GZSTATE_COMMENT,
 681                 GZSTATE_HEAD_CRC1,
 682                 GZSTATE_HEAD_CRC2,
 683                 GZSTATE_INIT,
 684                 GZSTATE_READ,
 685                 GZSTATE_CRC,
 686                 GZSTATE_LEN,
 687         } state = GZSTATE_MAGIC0;
 688         int flags = 0, skip_count = 0;
 689         int error = 0, done_reading = 0;
 690         uLong crc = 0;
 691         ssize_t wr;
 692
 693 #define ADVANCE()       { z.next_in++; z.avail_in--; }
 694
 695         if ((outbufp = malloc(BUFLEN)) == NULL) {
 696                 maybe_err("malloc failed");
 697                 goto out2;
 698         }
 699         if ((inbufp = malloc(BUFLEN)) == NULL) {
 700                 maybe_err("malloc failed");
 701                 goto out1;
 702         }
 703
 704         memset(&z, 0, sizeof z);
 705         z.avail_in = prelen;
 706         z.next_in = pre;
 707         z.avail_out = BUFLEN;
 708         z.next_out = outbufp;
 709         z.zalloc = NULL;
 710         z.zfree = NULL;
 711         z.opaque = 0;
 712
 713
 714         for (;;) {
 715                 if (z.avail_in == 0 && done_reading == 0) {
 716                         ssize_t in_size = read(in, inbufp, BUFLEN);
 717
 718                         if (in_size == -1) {
 719 #ifndef SMALL
 720                                 if (tflag && vflag)
 721                                         print_test(filename, 0);
 722 #endif
 723                                 maybe_warn("failed to read stdin");
 724                                 out_tot = -1;
 725                                 goto stop;
 726                         } else if (in_size == 0)
 727                                 done_reading = 1;
 728
 729                         z.avail_in = in_size;
 730                         z.next_in = inbufp;
 731
 732                         in_tot += in_size;
 733                 }
 734                 if (z.avail_in == 0) {
 735                         if (done_reading && state != GZSTATE_MAGIC0)
 736                                 maybe_warnx("%s: unexpected end of file",
 737                                             filename);
 738                         goto stop;
 739                 }
 740                 switch (state) {
 741                 case GZSTATE_MAGIC0:
 742                         if (*z.next_in != GZIP_MAGIC0) {
 743                                 maybe_warnx("input not gziped (MAGIC0)");
 744                                 out_tot = -1;
 745                                 goto stop;
 746                         }
 747                         ADVANCE();
 748                         state++;
 749                         out_sub_tot = 0;
 750                         crc = crc32(0L, Z_NULL, 0);
 751                         break;
 752
 753                 case GZSTATE_MAGIC1:
 754                         if (*z.next_in != GZIP_MAGIC1 &&
 755                             *z.next_in != GZIP_OMAGIC1) {
 756                                 maybe_warnx("input not gziped (MAGIC1)");
 757                                 out_tot = -1;
 758                                 goto stop;
 759                         }
 760                         ADVANCE();
 761                         state++;
 762                         break;
 763
 764                 case GZSTATE_METHOD:
 765                         if (*z.next_in != Z_DEFLATED) {
 766                                 maybe_warnx("unknown compression method");
 767                                 out_tot = -1;
 768                                 goto stop;
 769                         }
 770                         ADVANCE();
 771                         state++;
 772                         break;
 773
 774                 case GZSTATE_FLAGS:
 775                         flags = *z.next_in;
 776                         ADVANCE();
 777                         skip_count = 6;
 778                         state++;
 779                         break;
 780
 781                 case GZSTATE_SKIPPING:
 782                         if (skip_count > 0) {
 783                                 skip_count--;
 784                                 ADVANCE();
 785                         } else
 786                                 state++;
 787                         break;
 788
 789                 case GZSTATE_EXTRA:
 790                         if ((flags & EXTRA_FIELD) == 0) {
 791                                 state = GZSTATE_ORIGNAME;
 792                                 break;
 793                         }
 794                         skip_count = *z.next_in;
 795                         ADVANCE();
 796                         state++;
 797                         break;
 798
 799                 case GZSTATE_EXTRA2:
 800                         skip_count |= ((*z.next_in) << 8);
 801                         ADVANCE();
 802                         state++;
 803                         break;
 804
 805                 case GZSTATE_EXTRA3:
 806                         if (skip_count > 0) {
 807                                 skip_count--;
 808                                 ADVANCE();
 809                         } else
 810                                 state++;
 811                         break;
 812
 813                 case GZSTATE_ORIGNAME:
 814                         if ((flags & ORIG_NAME) == 0) {
 815                                 state++;
 816                                 break;
 817                         }
 818                         if (*z.next_in == 0)
 819                                 state++;
 820                         ADVANCE();
 821                         break;
 822
 823                 case GZSTATE_COMMENT:
 824                         if ((flags & COMMENT) == 0) {
 825                                 state++;
 826                                 break;
 827                         }
 828                         if (*z.next_in == 0)
 829                                 state++;
 830                         ADVANCE();
 831                         break;
 832
 833                 case GZSTATE_HEAD_CRC1:
 834                         if (flags & HEAD_CRC)
 835                                 skip_count = 2;
 836                         else
 837                                 skip_count = 0;
 838                         state++;
 839                         break;
 840
 841                 case GZSTATE_HEAD_CRC2:
 842                         if (skip_count > 0) {
 843                                 skip_count--;
 844                                 ADVANCE();
 845                         } else
 846                                 state++;
 847                         break;
 848
 849                 case GZSTATE_INIT:
 850                         if (inflateInit2(&z, -MAX_WBITS) != Z_OK) {
 851                                 maybe_warnx("failed to inflateInit");
 852                                 out_tot = -1;
 853                                 goto stop;
 854                         }
 855                         state++;
 856                         break;
 857
 858                 case GZSTATE_READ:
 859                         error = inflate(&z, Z_FINISH);
 860                         /* Z_BUF_ERROR goes with Z_FINISH... */
 861                         if (error != Z_STREAM_END && error != Z_BUF_ERROR)
 862                                 /* Just need more input */
 863                                 break;
 864                         wr = BUFLEN - z.avail_out;
 865
 866                         if (wr != 0) {
 867                                 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr);
 868                                 if (
 869 #ifndef SMALL
 870                                     /* don't write anything with -t */
 871                                     tflag == 0 &&
 872 #endif
 873                                     write(out, outbufp, wr) != wr) {
 874                                         maybe_warn("error writing to output");
 875                                         out_tot = -1;
 876                                         goto stop;
 877                                 }
 878
 879                                 out_tot += wr;
 880                                 out_sub_tot += wr;
 881                         }
 882
 883                         if (error == Z_STREAM_END) {
 884                                 inflateEnd(&z);
 885                                 state++;
 886                         }
 887
 888                         z.next_out = outbufp;
 889                         z.avail_out = BUFLEN;
 890
 891                         break;
 892                 case GZSTATE_CRC:
 893                         {
 894                                 static int empty_buffer = 0;
 895                                 uLong origcrc;
 896
 897                                 if (z.avail_in < 4) {
 898                                         if (!done_reading && empty_buffer++ < 4)
 899                                                 continue;
 900                                         maybe_warnx("truncated input");
 901                                         out_tot = -1;
 902                                         goto stop;
 903                                 }
 904                                 empty_buffer = 0;
 905                                 origcrc = ((unsigned)z.next_in[0] & 0xff) |
 906                                         ((unsigned)z.next_in[1] & 0xff) << 8 |
 907                                         ((unsigned)z.next_in[2] & 0xff) << 16 |
 908                                         ((unsigned)z.next_in[3] & 0xff) << 24;
 909                                 if (origcrc != crc) {
 910                                         maybe_warnx("invalid compressed"
 911                                              " data--crc error");
 912                                         out_tot = -1;
 913                                         goto stop;
 914                                 }
 915                         }
 916
 917                         z.avail_in -= 4;
 918                         z.next_in += 4;
 919
 920                         if (!z.avail_in)
 921                                 goto stop;
 922                         state++;
 923                         break;
 924                 case GZSTATE_LEN:
 925                         {
 926                                 static int empty_buffer = 0;
 927                                 uLong origlen;
 928
 929                                 if (z.avail_in < 4) {
 930                                         if (!done_reading && empty_buffer++ < 4)
 931                                                 continue;
 932                                         maybe_warnx("truncated input");
 933                                         out_tot = -1;
 934                                         goto stop;
 935                                 }
 936                                 empty_buffer = 0;
 937                                 origlen = ((unsigned)z.next_in[0] & 0xff) |
 938                                         ((unsigned)z.next_in[1] & 0xff) << 8 |
 939                                         ((unsigned)z.next_in[2] & 0xff) << 16 |
 940                                         ((unsigned)z.next_in[3] & 0xff) << 24;
 941
 942                                 if (origlen != out_sub_tot) {
 943                                         maybe_warnx("invalid compressed"
 944                                              " data--length error");
 945                                         out_tot = -1;
 946                                         goto stop;
 947                                 }
 948                         }
 949
 950                         z.avail_in -= 4;
 951                         z.next_in += 4;
 952
 953                         if (error < 0) {
 954                                 maybe_warnx("decompression error");
 955                                 out_tot = -1;
 956                                 goto stop;
 957                         }
 958                         state = GZSTATE_MAGIC0;
 959                         break;
 960                 }
 961                 continue;
 962 stop:
 963                 break;
 964         }
 965         if (state > GZSTATE_INIT)
 966                 inflateEnd(&z);
 967
 968 #ifndef SMALL
 969         if (tflag && vflag)
 970                 print_test(filename, out_tot != -1);
 971 #endif
 972
 973         free(inbufp);
 974 out1:
 975         free(outbufp);
 976 out2:
 977         if (gsizep)
 978                 *gsizep = in_tot;
 979         return (out_tot);
 980 }
 981
 982 #ifndef SMALL
 983 /*
 984  * set the owner, mode, flags & utimes for a file
 985  */
 986 static void
 987 copymodes(const char *file, struct stat *sbp)
 988 {
 989         struct timeval times[2];
 990
 991         /*
 992          * If we have no info on the input, give this file some
 993          * default values and return..
 994          */
 995         if (sbp == NULL) {
 996                 mode_t mask = umask(022);
 997
 998                 (void)chmod(file, DEFFILEMODE & ~mask);
 999                 (void)umask(mask);
1000                 return;
1001         }
1002
1003         /* if the chown fails, remove set-id bits as-per compress(1) */
1004         if (chown(file, sbp->st_uid, sbp->st_gid) < 0) {
1005                 if (errno != EPERM)
1006                         maybe_warn("couldn't chown: %s", file);
1007                 sbp->st_mode &= ~(S_ISUID|S_ISGID);
1008         }
1009
1010         /* we only allow set-id and the 9 normal permission bits */
1011         sbp->st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
1012         if (chmod(file, sbp->st_mode) < 0)
1013                 maybe_warn("couldn't chmod: %s", file);
1014
1015         /* only try flags if they exist already */
1016         if (sbp->st_flags != 0 && chflags(file, sbp->st_flags) < 0)
1017                 maybe_warn("couldn't chflags: %s", file);
1018
1019         TIMESPEC_TO_TIMEVAL(&times[0], &sbp->st_atimespec);
1020         TIMESPEC_TO_TIMEVAL(&times[1], &sbp->st_mtimespec);
1021         if (utimes(file, times) < 0)
1022                 maybe_warn("couldn't utimes: %s", file);
1023 }
1024 #endif
1025
1026 /* what sort of file is this? */
1027 static enum filetype
1028 file_gettype(u_char *buf)
1029 {
1030
1031         if (buf[0] == GZIP_MAGIC0 &&
1032             (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
1033                 return FT_GZIP;
1034         else
1035 #ifndef NO_BZIP2_SUPPORT
1036         if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
1037             buf[3] >= '0' && buf[3] <= '9')
1038                 return FT_BZIP2;
1039         else
1040 #endif
1041 #ifndef NO_COMPRESS_SUPPORT
1042         if (memcmp(buf, Z_MAGIC, 2) == 0)
1043                 return FT_Z;
1044         else
1045 #endif
1046                 return FT_UNKNOWN;
1047 }
1048
1049 #ifndef SMALL
1050 /* check the outfile is OK. */
1051 static int
1052 check_outfile(const char *outfile, struct stat *sb)
1053 {
1054         int ok = 1;
1055
1056         if (lflag == 0 && stat(outfile, sb) == 0) {
1057                 if (fflag)
1058                         unlink(outfile);
1059                 else if (isatty(STDIN_FILENO)) {
1060                         char ans[10] = { 'n', '\0' };   /* default */
1061
1062                         fprintf(stderr, "%s already exists -- do you wish to "
1063                                         "overwrite (y or n)? " , outfile);
1064                         (void)fgets(ans, sizeof(ans) - 1, stdin);
1065                         if (ans[0] != 'y' && ans[0] != 'Y') {
1066                                 fprintf(stderr, "\tnot overwriting\n");
1067                                 ok = 0;
1068                         } else
1069                                 unlink(outfile);
1070                 } else {
1071                         maybe_warnx("%s already exists -- skipping", outfile);
1072                         ok = 0;
1073                 }
1074         }
1075         return ok;
1076 }
1077
1078 static void
1079 unlink_input(const char *file, struct stat *sb)
1080 {
1081         struct stat nsb;
1082
1083         if (kflag)
1084                 return;
1085
1086         if (stat(file, &nsb) != 0)
1087                 /* Must be gone alrady */
1088                 return;
1089         if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
1090                 /* Definitely a different file */
1091                 return;
1092         unlink(file);
1093 }
1094 #endif
1095
1096 static const suffixes_t *
1097 check_suffix(char *file, int xlate)
1098 {
1099         const suffixes_t *s;
1100         int len = strlen(file);
1101         char *sp;
1102
1103         for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
1104                 /* if it doesn't fit in "a.suf", don't bother */
1105                 if (s->ziplen >= len)
1106                         continue;
1107                 sp = file + len - s->ziplen;
1108                 if (strcmp(s->zipped, sp) != 0)
1109                         continue;
1110                 if (xlate)
1111                         strcpy(sp, s->normal);
1112                 return s;
1113         }
1114         return NULL;
1115 }
1116
1117 /*
1118  * compress the given file: create a corresponding .gz file and remove the
1119  * original.
1120  */
1121 static off_t
1122 file_compress(char *file, char *outfile, size_t outsize)
1123 {
1124         int in;
1125         int out;
1126         off_t size, insize;
1127 #ifndef SMALL
1128         struct stat isb, osb;
1129         const suffixes_t *suff;
1130 #endif
1131
1132         in = open(file, O_RDONLY);
1133         if (in == -1) {
1134                 maybe_warn("can't open %s", file);
1135                 return -1;
1136         }
1137
1138         if (cflag == 0) {
1139 #ifndef SMALL
1140                 if (stat(file, &isb) == 0) {
1141                         if (isb.st_nlink > 1 && fflag == 0) {
1142                                 maybe_warnx("%s has %d other link%s -- "
1143                                             "skipping", file, isb.st_nlink - 1,
1144                                             isb.st_nlink == 1 ? "" : "s");
1145                                 close(in);
1146                                 return -1;
1147                         }
1148                 }
1149
1150                 if (fflag == 0 && (suff = check_suffix(file, 0))
1151                     && suff->zipped[0] != 0) {
1152                         maybe_warnx("%s already has %s suffix -- unchanged",
1153                                     file, suff->zipped);
1154                         close(in);
1155                         return -1;
1156                 }
1157 #endif
1158
1159                 /* Add (usually) .gz to filename */
1160                 if ((size_t)snprintf(outfile, outsize, "%s%s",
1161                                         file, suffixes[0].zipped) >= outsize)
1162                         memcpy(outfile - suffixes[0].ziplen - 1,
1163                                 suffixes[0].zipped, suffixes[0].ziplen + 1);
1164
1165 #ifndef SMALL
1166                 if (check_outfile(outfile, &osb) == 0) {
1167                         close(in);
1168                         return -1;
1169                 }
1170 #endif
1171         }
1172
1173         if (cflag == 0) {
1174                 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
1175                 if (out == -1) {
1176                         maybe_warn("could not create output: %s", outfile);
1177                         fclose(stdin);
1178                         return -1;
1179                 }
1180         } else
1181                 out = STDOUT_FILENO;
1182
1183         insize = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
1184
1185         (void)close(in);
1186
1187         /*
1188          * If there was an error, insize will be -1.
1189          * If we compressed to stdout, just return the size.
1190          * Otherwise stat the file and check it is the correct size.
1191          * We only blow away the file if we can stat the output and it
1192          * has the expected size.
1193          */
1194         if (cflag != 0)
1195                 return insize == -1 ? -1 : size;
1196
1197         if (close(out) == -1)
1198                 maybe_warn("couldn't close ouput");
1199
1200 #ifndef SMALL
1201         if (stat(outfile, &osb) < 0) {
1202                 maybe_warn("couldn't stat: %s", outfile);
1203                 goto bad_outfile;
1204         }
1205
1206         if (osb.st_size != size) {
1207                 maybe_warnx("output file: %s wrong size (%" PRIdOFF
1208                                 " != %" PRIdOFF "), deleting",
1209                                 outfile, osb.st_size, size);
1210                 goto bad_outfile;
1211         }
1212
1213         copymodes(outfile, &isb);
1214 #endif
1215
1216         /* output is good, ok to delete input */
1217         unlink_input(file, &isb);
1218         return size;
1219
1220 #ifndef SMALL
1221     bad_outfile:
1222         maybe_warnx("leaving original %s", file);
1223         unlink(outfile);
1224         return size;
1225 #endif
1226 }
1227
1228 /* uncompress the given file and remove the original */
1229 static off_t
1230 file_uncompress(char *file, char *outfile, size_t outsize)
1231 {
1232         struct stat isb, osb;
1233         off_t size;
1234         ssize_t rbytes;
1235         unsigned char header1[4];
1236         enum filetype method;
1237         int fd, zfd = -1;
1238 #ifndef SMALL
1239         time_t timestamp = 0;
1240         unsigned char name[PATH_MAX + 1];
1241 #endif
1242
1243         /* gather the old name info */
1244
1245         fd = open(file, O_RDONLY);
1246         if (fd < 0) {
1247                 maybe_warn("can't open %s", file);
1248                 goto lose;
1249         }
1250
1251         strlcpy(outfile, file, outsize);
1252         if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
1253                 maybe_warnx("%s: unknown suffix -- ignored", file);
1254                 goto lose;
1255         }
1256
1257         rbytes = read(fd, header1, sizeof header1);
1258         if (rbytes != sizeof header1) {
1259                 /* we don't want to fail here. */
1260 #ifndef SMALL
1261                 if (fflag)
1262                         goto lose;
1263 #endif
1264                 if (rbytes == -1)
1265                         maybe_warn("can't read %s", file);
1266                 else
1267                         maybe_warnx("%s: unexpected end of file", file);
1268                 goto lose;
1269         }
1270
1271         method = file_gettype(header1);
1272
1273 #ifndef SMALL
1274         if (fflag == 0 && method == FT_UNKNOWN) {
1275                 maybe_warnx("%s: not in gzip format", file);
1276                 goto lose;
1277         }
1278
1279 #endif
1280
1281 #ifndef SMALL
1282         if (method == FT_GZIP && Nflag) {
1283                 unsigned char ts[4];    /* timestamp */
1284
1285                 if (pread(fd, ts, sizeof ts, GZIP_TIMESTAMP) != sizeof ts) {
1286                         if (!fflag)
1287                                 maybe_warn("can't read %s", file);
1288                         goto lose;
1289                 }
1290                 timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0];
1291
1292                 if (header1[3] & ORIG_NAME) {
1293                         rbytes = pread(fd, name, sizeof name, GZIP_ORIGNAME);
1294                         if (rbytes < 0) {
1295                                 maybe_warn("can't read %s", file);
1296                                 goto lose;
1297                         }
1298                         if (name[0] != 0) {
1299                                 /* preserve original directory name */
1300                                 char *dp = strrchr(file, '/');
1301                                 if (dp == NULL)
1302                                         dp = file;
1303                                 else
1304                                         dp++;
1305                                 snprintf(outfile, outsize, "%.*s%.*s",
1306                                                 (int) (dp - file),
1307                                                 file, (int) rbytes, name);
1308                         }
1309                 }
1310         }
1311 #endif
1312         lseek(fd, 0, SEEK_SET);
1313
1314         if (cflag == 0 || lflag) {
1315                 if (fstat(fd, &isb) != 0)
1316                         goto lose;
1317 #ifndef SMALL
1318                 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
1319                         maybe_warnx("%s has %d other links -- skipping",
1320                             file, isb.st_nlink - 1);
1321                         goto lose;
1322                 }
1323                 if (nflag == 0 && timestamp)
1324                         isb.st_mtime = timestamp;
1325                 if (check_outfile(outfile, &osb) == 0)
1326                         goto lose;
1327 #endif
1328         }
1329
1330         if (cflag == 0 && lflag == 0) {
1331                 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
1332                 if (zfd == STDOUT_FILENO) {
1333                         /* We won't close STDOUT_FILENO later... */
1334                         zfd = dup(zfd);
1335                         close(STDOUT_FILENO);
1336                 }
1337                 if (zfd == -1) {
1338                         maybe_warn("can't open %s", outfile);
1339                         goto lose;
1340                 }
1341         } else
1342                 zfd = STDOUT_FILENO;
1343
1344 #ifndef NO_BZIP2_SUPPORT
1345         if (method == FT_BZIP2) {
1346
1347                 /* XXX */
1348                 if (lflag) {
1349                         maybe_warnx("no -l with bzip2 files");
1350                         goto lose;
1351                 }
1352
1353                 size = unbzip2(fd, zfd, NULL, 0, NULL);
1354         } else
1355 #endif
1356
1357 #ifndef NO_COMPRESS_SUPPORT
1358         if (method == FT_Z) {
1359                 FILE *in, *out;
1360
1361                 /* XXX */
1362                 if (lflag) {
1363                         maybe_warnx("no -l with Lempel-Ziv files");
1364                         goto lose;
1365                 }
1366
1367                 if ((in = zdopen(fd)) == NULL) {
1368                         maybe_warn("zdopen for read: %s", file);
1369                         goto lose;
1370                 }
1371
1372                 out = fdopen(dup(zfd), "w");
1373                 if (out == NULL) {
1374                         maybe_warn("fdopen for write: %s", outfile);
1375                         fclose(in);
1376                         goto lose;
1377                 }
1378
1379                 size = zuncompress(in, out, NULL, 0, NULL);
1380                 /* need to fclose() if ferror() is true... */
1381                 if (ferror(in) | fclose(in)) {
1382                         maybe_warn("failed infile fclose");
1383                         unlink(outfile);
1384                         (void)fclose(out);
1385                 }
1386                 if (fclose(out) != 0) {
1387                         maybe_warn("failed outfile fclose");
1388                         unlink(outfile);
1389                         goto lose;
1390                 }
1391         } else
1392 #endif
1393
1394 #ifndef SMALL
1395         if (method == FT_UNKNOWN) {
1396                 if (lflag) {
1397                         maybe_warnx("no -l for unknown filetypes");
1398                         goto lose;
1399                 }
1400                 size = cat_fd(NULL, 0, NULL, fd);
1401         } else
1402 #endif
1403         {
1404                 if (lflag) {
1405                         print_list(fd, isb.st_size, outfile, isb.st_mtime);
1406                         close(fd);
1407                         return -1;      /* XXX */
1408                 }
1409
1410                 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
1411         }
1412
1413         if (close(fd) != 0)
1414                 maybe_warn("couldn't close input");
1415         if (zfd != STDOUT_FILENO && close(zfd) != 0)
1416                 maybe_warn("couldn't close output");
1417
1418         if (size == -1) {
1419                 if (cflag == 0)
1420                         unlink(outfile);
1421                 maybe_warnx("%s: uncompress failed", file);
1422                 return -1;
1423         }
1424
1425         /* if testing, or we uncompressed to stdout, this is all we need */
1426 #ifndef SMALL
1427         if (tflag)
1428                 return size;
1429 #endif
1430         /* if we are uncompressing to stdin, don't remove the file. */
1431         if (cflag)
1432                 return size;
1433
1434         /*
1435          * if we create a file...
1436          */
1437         /*
1438          * if we can't stat the file don't remove the file.
1439          */
1440         if (stat(outfile, &osb) < 0) {
1441                 maybe_warn("couldn't stat (leaving original): %s",
1442                            outfile);
1443                 return -1;
1444         }
1445         if (osb.st_size != size) {
1446                 maybe_warn("stat gave different size: %" PRIdOFF
1447                                 " != %" PRIdOFF " (leaving original)",
1448                                 size, osb.st_size);
1449                 unlink(outfile);
1450                 return -1;
1451         }
1452         unlink_input(file, &isb);
1453 #ifndef SMALL
1454         copymodes(outfile, &isb);
1455 #endif
1456         return size;
1457
1458     lose:
1459         if (fd != -1)
1460                 close(fd);
1461         if (zfd != -1 && zfd != STDOUT_FILENO)
1462                 close(fd);
1463         return -1;
1464 }
1465
1466 #ifndef SMALL
1467 static off_t
1468 cat_fd(unsigned char * prepend, ssize_t count, off_t *gsizep, int fd)
1469 {
1470         char buf[BUFLEN];
1471         ssize_t rv;
1472         off_t in_tot;
1473
1474         in_tot = count;
1475         if (write(STDOUT_FILENO, prepend, count) != count) {
1476                 maybe_warn("write to stdout");
1477                 return -1;
1478         }
1479         for (;;) {
1480                 rv = read(fd, buf, sizeof buf);
1481                 if (rv == 0)
1482                         break;
1483                 if (rv < 0) {
1484                         maybe_warn("read from fd %d", fd);
1485                         break;
1486                 }
1487
1488                 if (write(STDOUT_FILENO, buf, rv) != rv) {
1489                         maybe_warn("write to stdout");
1490                         break;
1491                 }
1492                 in_tot += rv;
1493         }
1494
1495         if (gsizep)
1496                 *gsizep = in_tot;
1497         return (in_tot);
1498 }
1499 #endif
1500
1501 static void
1502 handle_stdin(void)
1503 {
1504         unsigned char header1[4];
1505         off_t usize, gsize;
1506         enum filetype method;
1507 #ifndef NO_COMPRESS_SUPPORT
1508         FILE *in;
1509 #endif
1510
1511 #ifndef SMALL
1512         if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
1513                 maybe_warnx("standard input is a terminal -- ignoring");
1514                 return;
1515         }
1516 #endif
1517
1518         if (lflag) {
1519                 struct stat isb;
1520
1521                 /* XXX could read the whole file, etc. */
1522                 if (fstat(STDIN_FILENO, &isb) < 0) {
1523                         maybe_warn("fstat");
1524                         return;
1525                 }
1526                 print_list(STDIN_FILENO, isb.st_size, "stdout", isb.st_mtime);
1527                 return;
1528         }
1529
1530         if (read(STDIN_FILENO, header1, sizeof header1) != sizeof header1) {
1531                 maybe_warn("can't read stdin");
1532                 return;
1533         }
1534
1535         method = file_gettype(header1);
1536         switch (method) {
1537         default:
1538 #ifndef SMALL
1539                 if (fflag == 0) {
1540                         maybe_warnx("unknown compression format");
1541                         return;
1542                 }
1543                 usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO);
1544                 break;
1545 #endif
1546         case FT_GZIP:
1547                 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
1548                               header1, sizeof header1, &gsize, "(stdin)");
1549                 break;
1550 #ifndef NO_BZIP2_SUPPORT
1551         case FT_BZIP2:
1552                 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
1553                                 header1, sizeof header1, &gsize);
1554                 break;
1555 #endif
1556 #ifndef NO_COMPRESS_SUPPORT
1557         case FT_Z:
1558                 if ((in = zdopen(STDIN_FILENO)) == NULL) {
1559                         maybe_warnx("zopen of stdin");
1560                         return;
1561                 }
1562
1563                 usize = zuncompress(in, stdout, header1, sizeof header1, &gsize);
1564                 fclose(in);
1565                 break;
1566 #endif
1567         }
1568
1569 #ifndef SMALL
1570         if (vflag && !tflag && usize != -1 && gsize != -1)
1571                 print_verbage(NULL, NULL, usize, gsize);
1572 #endif
1573
1574 }
1575
1576 static void
1577 handle_stdout(void)
1578 {
1579         off_t gsize, usize;
1580
1581 #ifndef SMALL
1582         if (fflag == 0 && isatty(STDOUT_FILENO)) {
1583                 maybe_warnx("standard output is a terminal -- ignoring");
1584                 return;
1585         }
1586 #endif
1587         usize = gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", 0);
1588
1589 #ifndef SMALL
1590         if (vflag && !tflag && usize != -1 && gsize != -1)
1591                 print_verbage(NULL, NULL, usize, gsize);
1592 #endif
1593 }
1594
1595 /* do what is asked for, for the path name */
1596 static void
1597 handle_pathname(char *path)
1598 {
1599         char *opath = path, *s = NULL;
1600         ssize_t len;
1601         int slen;
1602         struct stat sb;
1603
1604         /* check for stdout/stdin */
1605         if (path[0] == '-' && path[1] == '\0') {
1606                 if (dflag)
1607                         handle_stdin();
1608                 else
1609                         handle_stdout();
1610                 return;
1611         }
1612
1613 retry:
1614         if (stat(path, &sb) < 0) {
1615                 /* lets try <path>.gz if we're decompressing */
1616                 if (dflag && s == NULL && errno == ENOENT) {
1617                         len = strlen(path);
1618                         slen = suffixes[0].ziplen;
1619                         s = malloc(len + slen + 1);
1620                         if (s == NULL)
1621                                 maybe_err("malloc");
1622                         memcpy(s, path, len);
1623                         memcpy(s + len, suffixes[0].zipped, slen + 1);
1624                         path = s;
1625                         goto retry;
1626                 }
1627                 maybe_warn("can't stat: %s", opath);
1628                 goto out;
1629         }
1630
1631         if (S_ISDIR(sb.st_mode)) {
1632 #ifndef SMALL
1633                 if (rflag)
1634                         handle_dir(path);
1635                 else
1636 #endif
1637                         maybe_warnx("%s is a directory", path);
1638                 goto out;
1639         }
1640
1641         if (S_ISREG(sb.st_mode))
1642                 handle_file(path, &sb);
1643         else
1644                 maybe_warnx("%s is not a regular file", path);
1645
1646 out:
1647         if (s)
1648                 free(s);
1649 }
1650
1651 /* compress/decompress a file */
1652 static void
1653 handle_file(char *file, struct stat *sbp)
1654 {
1655         off_t usize, gsize;
1656         char    outfile[PATH_MAX];
1657
1658         infile = file;
1659         if (dflag) {
1660                 usize = file_uncompress(file, outfile, sizeof(outfile));
1661                 if (usize == -1)
1662                         return;
1663                 gsize = sbp->st_size;
1664         } else {
1665                 gsize = file_compress(file, outfile, sizeof(outfile));
1666                 if (gsize == -1)
1667                         return;
1668                 usize = sbp->st_size;
1669         }
1670
1671
1672 #ifndef SMALL
1673         if (vflag && !tflag)
1674                 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
1675 #endif
1676 }
1677
1678 #ifndef SMALL
1679 /* this is used with -r to recursively descend directories */
1680 static void
1681 handle_dir(char *dir)
1682 {
1683         char *path_argv[2];
1684         FTS *fts;
1685         FTSENT *entry;
1686
1687         path_argv[0] = dir;
1688         path_argv[1] = 0;
1689         fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
1690         if (fts == NULL) {
1691                 warn("couldn't fts_open %s", dir);
1692                 return;
1693         }
1694
1695         while ((entry = fts_read(fts))) {
1696                 switch(entry->fts_info) {
1697                 case FTS_D:
1698                 case FTS_DP:
1699                         continue;
1700
1701                 case FTS_DNR:
1702                 case FTS_ERR:
1703                 case FTS_NS:
1704                         maybe_warn("%s", entry->fts_path);
1705                         continue;
1706                 case FTS_F:
1707                         handle_file(entry->fts_path, entry->fts_statp);
1708                 }
1709         }
1710         (void)fts_close(fts);
1711 }
1712 #endif
1713
1714 /* print a ratio - size reduction as a fraction of uncompressed size */
1715 static void
1716 print_ratio(off_t in, off_t out, FILE *where)
1717 {
1718         int percent10;  /* 10 * percent */
1719         off_t diff;
1720         char buff[8];
1721         int len;
1722
1723         diff = in - out/2;
1724         if (diff <= 0)
1725                 /*
1726                  * Output is more than double size of input! print -99.9%
1727                  * Quite possibly we've failed to get the original size.
1728                  */
1729                 percent10 = -999;
1730         else {
1731                 /*
1732                  * We only need 12 bits of result from the final division,
1733                  * so reduce the values until a 32bit division will suffice.
1734                  */
1735                 while (in > 0x100000) {
1736                         diff >>= 1;
1737                         in >>= 1;
1738                 }
1739                 if (in != 0)
1740                         percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
1741                 else
1742                         percent10 = 0;
1743         }
1744
1745         len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
1746         /* Move the '.' to before the last digit */
1747         buff[len - 1] = buff[len - 2];
1748         buff[len - 2] = '.';
1749         fprintf(where, "%5s%%", buff);
1750 }
1751
1752 #ifndef SMALL
1753 /* print compression statistics, and the new name (if there is one!) */
1754 static void
1755 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
1756 {
1757         if (file)
1758                 fprintf(stderr, "%s:%s  ", file,
1759                     strlen(file) < 7 ? "\t\t" : "\t");
1760         print_ratio(usize, gsize, stderr);
1761         if (nfile)
1762                 fprintf(stderr, " -- replaced with %s", nfile);
1763         fprintf(stderr, "\n");
1764         fflush(stderr);
1765 }
1766
1767 /* print test results */
1768 static void
1769 print_test(const char *file, int ok)
1770 {
1771
1772         if (exit_value == 0 && ok == 0)
1773                 exit_value = 1;
1774         fprintf(stderr, "%s:%s  %s\n", file,
1775             strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
1776         fflush(stderr);
1777 }
1778 #endif
1779
1780 /* print a file's info ala --list */
1781 /* eg:
1782   compressed uncompressed  ratio uncompressed_name
1783       354841      1679360  78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
1784 */
1785 static void
1786 print_list(int fd, off_t out, const char *outfile, time_t ts)
1787 {
1788         static int first = 1;
1789 #ifndef SMALL
1790         static off_t in_tot, out_tot;
1791         uint32_t crc = 0;
1792 #endif
1793         off_t in = 0;
1794         int rv;
1795
1796         if (first) {
1797 #ifndef SMALL
1798                 if (vflag)
1799                         printf("method  crc     date  time  ");
1800 #endif
1801                 if (qflag == 0)
1802                         printf("  compressed uncompressed  "
1803                                "ratio uncompressed_name\n");
1804         }
1805         first = 0;
1806
1807         /* print totals? */
1808 #ifndef SMALL
1809         if (fd == -1) {
1810                 in = in_tot;
1811                 out = out_tot;
1812         } else
1813 #endif
1814         {
1815                 /* read the last 4 bytes - this is the uncompressed size */
1816                 rv = lseek(fd, (off_t)(-8), SEEK_END);
1817                 if (rv != -1) {
1818                         unsigned char buf[8];
1819                         uint32_t usize;
1820
1821                         if (read(fd, (char *)buf, sizeof(buf)) != sizeof(buf))
1822                                 maybe_warn("read of uncompressed size");
1823                         usize = buf[4] | buf[5] << 8 | buf[6] << 16 | buf[7] << 24;
1824                         in = (off_t)usize;
1825 #ifndef SMALL
1826                         crc = buf[0] | buf[1] << 8 | buf[2] << 16 | buf[3] << 24;
1827 #endif
1828                 }
1829         }
1830
1831 #ifndef SMALL
1832         if (vflag && fd == -1)
1833                 printf("                            ");
1834         else if (vflag) {
1835                 char *date = ctime(&ts);
1836
1837                 /* skip the day, 1/100th second, and year */
1838                 date += 4;
1839                 date[12] = 0;
1840                 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
1841         }
1842         in_tot += in;
1843         out_tot += out;
1844 #endif
1845         printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
1846         print_ratio(in, out, stdout);
1847         printf(" %s\n", outfile);
1848 }
1849
1850 /* display the usage of NetBSD gzip */
1851 static void
1852 usage(void)
1853 {
1854
1855         fprintf(stderr, "%s\n", gzip_version);
1856         fprintf(stderr,
1857 #ifdef SMALL
1858     "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n",
1859 #else
1860     "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n"
1861     " -c --stdout          write to stdout, keep original files\n"
1862     "    --to-stdout\n"
1863     " -d --decompress      uncompress files\n"
1864     "    --uncompress\n"
1865     " -f --force           force overwriting & compress links\n"
1866     " -h --help            display this help\n"
1867     " -k --keep            don't delete input files during operation\n"
1868     " -n --no-name         don't save original file name or time stamp\n"
1869     " -N --name            save or restore original file name and time stamp\n"
1870     " -q --quiet           output no warnings\n"
1871     " -r --recursive       recursively compress files in directories\n"
1872     " -S .suf              use suffix .suf instead of .gz\n"
1873     "    --suffix .suf\n"
1874     " -t --test            test compressed file\n"
1875     " -v --verbose         print extra statistics\n"
1876     " -V --version         display program version\n"
1877     " -1 --fast            fastest (worst) compression\n"
1878     " -2 .. -8             set compression level\n"
1879     " -9 --best            best (slowest) compression\n",
1880 #endif
1881             getprogname());
1882         exit(0);
1883 }
1884
1885 /* display the version of NetBSD gzip */
1886 static void
1887 display_version(void)
1888 {
1889
1890         fprintf(stderr, "%s\n", gzip_version);
1891         exit(0);
1892 }
1893
1894 #ifndef NO_BZIP2_SUPPORT
1895 #include "unbzip2.c"
1896 #endif
1897 #ifndef NO_COMPRESS_SUPPORT
1898 #include "zuncompress.c"
1899 #endif