usr.bin/gzip/gzip.c

   1 /*      $NetBSD: gzip.c,v 1.97 2009/10/11 09:17:21 mrg Exp $    */
   2
   3 /*-
   4  * Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  */
  29
  30 #include <sys/cdefs.h>
  31 #ifndef lint
  32 __COPYRIGHT("@(#) Copyright (c) 1997, 1998, 2003, 2004, 2006\
  33  Matthew R. Green.  All rights reserved.");
  34 __RCSID("$FreeBSD$");
  35 #endif /* not lint */
  36
  37 /*
  38  * gzip.c -- GPL free gzip using zlib.
  39  *
  40  * RFC 1950 covers the zlib format
  41  * RFC 1951 covers the deflate format
  42  * RFC 1952 covers the gzip format
  43  *
  44  * TODO:
  45  *      - use mmap where possible
  46  *      - make bzip2/compress -v/-t/-l support work as well as possible
  47  */
  48
  49 #include <sys/param.h>
  50 #include <sys/stat.h>
  51 #include <sys/time.h>
  52
  53 #include <inttypes.h>
  54 #include <unistd.h>
  55 #include <stdio.h>
  56 #include <string.h>
  57 #include <stdlib.h>
  58 #include <err.h>
  59 #include <errno.h>
  60 #include <fcntl.h>
  61 #include <zlib.h>
  62 #include <fts.h>
  63 #include <libgen.h>
  64 #include <stdarg.h>
  65 #include <getopt.h>
  66 #include <time.h>
  67
  68 /* what type of file are we dealing with */
  69 enum filetype {
  70         FT_GZIP,
  71 #ifndef NO_BZIP2_SUPPORT
  72         FT_BZIP2,
  73 #endif
  74 #ifndef NO_COMPRESS_SUPPORT
  75         FT_Z,
  76 #endif
  77 #ifndef NO_PACK_SUPPORT
  78         FT_PACK,
  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 #ifndef NO_PACK_SUPPORT
  97 #define PACK_MAGIC      "\037\036"
  98 #endif
  99
 100 #define GZ_SUFFIX       ".gz"
 101
 102 #define BUFLEN          (64 * 1024)
 103
 104 #define GZIP_MAGIC0     0x1F
 105 #define GZIP_MAGIC1     0x8B
 106 #define GZIP_OMAGIC1    0x9E
 107
 108 #define GZIP_TIMESTAMP  (off_t)4
 109 #define GZIP_ORIGNAME   (off_t)10
 110
 111 #define HEAD_CRC        0x02
 112 #define EXTRA_FIELD     0x04
 113 #define ORIG_NAME       0x08
 114 #define COMMENT         0x10
 115
 116 #define OS_CODE         3       /* Unix */
 117
 118 typedef struct {
 119     const char  *zipped;
 120     int         ziplen;
 121     const char  *normal;        /* for unzip - must not be longer than zipped */
 122 } suffixes_t;
 123 static suffixes_t suffixes[] = {
 124 #define SUFFIX(Z, N) {Z, sizeof Z - 1, N}
 125         SUFFIX(GZ_SUFFIX,       ""),    /* Overwritten by -S .xxx */
 126 #ifndef SMALL
 127         SUFFIX(GZ_SUFFIX,       ""),
 128         SUFFIX(".z",            ""),
 129         SUFFIX("-gz",           ""),
 130         SUFFIX("-z",            ""),
 131         SUFFIX("_z",            ""),
 132         SUFFIX(".taz",          ".tar"),
 133         SUFFIX(".tgz",          ".tar"),
 134 #ifndef NO_BZIP2_SUPPORT
 135         SUFFIX(BZ2_SUFFIX,      ""),
 136         SUFFIX(".tbz",          ".tar"),
 137         SUFFIX(".tbz2",         ".tar"),
 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 #define SUFFIX_MAXLEN   30
 148
 149 static  const char      gzip_version[] = "FreeBSD gzip 20100407";
 150
 151 #ifndef SMALL
 152 static  const char      gzip_copyright[] = \
 153 "   Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green\n"
 154 "   All rights reserved.\n"
 155 "\n"
 156 "   Redistribution and use in source and binary forms, with or without\n"
 157 "   modification, are permitted provided that the following conditions\n"
 158 "   are met:\n"
 159 "   1. Redistributions of source code must retain the above copyright\n"
 160 "      notice, this list of conditions and the following disclaimer.\n"
 161 "   2. Redistributions in binary form must reproduce the above copyright\n"
 162 "      notice, this list of conditions and the following disclaimer in the\n"
 163 "      documentation and/or other materials provided with the distribution.\n"
 164 "\n"
 165 "   THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n"
 166 "   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n"
 167 "   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n"
 168 "   IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n"
 169 "   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,\n"
 170 "   BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n"
 171 "   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED\n"
 172 "   AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,\n"
 173 "   OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\n"
 174 "   OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\n"
 175 "   SUCH DAMAGE.";
 176 #endif
 177
 178 static  int     cflag;                  /* stdout mode */
 179 static  int     dflag;                  /* decompress mode */
 180 static  int     lflag;                  /* list mode */
 181 static  int     numflag = 6;            /* gzip -1..-9 value */
 182
 183 #ifndef SMALL
 184 static  int     fflag;                  /* force mode */
 185 static  int     kflag;                  /* don't delete input files */
 186 static  int     nflag;                  /* don't save name/timestamp */
 187 static  int     Nflag;                  /* don't restore name/timestamp */
 188 static  int     qflag;                  /* quiet mode */
 189 static  int     rflag;                  /* recursive mode */
 190 static  int     tflag;                  /* test */
 191 static  int     vflag;                  /* verbose mode */
 192 static  const char *remove_file = NULL; /* file to be removed upon SIGINT */
 193 #else
 194 #define         qflag   0
 195 #define         tflag   0
 196 #endif
 197
 198 static  int     exit_value = 0;         /* exit value */
 199
 200 static  char    *infile;                /* name of file coming in */
 201
 202 static  void    maybe_err(const char *fmt, ...) __dead2
 203     __attribute__((__format__(__printf__, 1, 2)));
 204 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT)
 205 static  void    maybe_errx(const char *fmt, ...) __dead2
 206     __attribute__((__format__(__printf__, 1, 2)));
 207 #endif
 208 static  void    maybe_warn(const char *fmt, ...)
 209     __attribute__((__format__(__printf__, 1, 2)));
 210 static  void    maybe_warnx(const char *fmt, ...)
 211     __attribute__((__format__(__printf__, 1, 2)));
 212 static  enum filetype file_gettype(u_char *);
 213 #ifdef SMALL
 214 #define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz)
 215 #endif
 216 static  off_t   gz_compress(int, int, off_t *, const char *, uint32_t);
 217 static  off_t   gz_uncompress(int, int, char *, size_t, off_t *, const char *);
 218 static  off_t   file_compress(char *, char *, size_t);
 219 static  off_t   file_uncompress(char *, char *, size_t);
 220 static  void    handle_pathname(char *);
 221 static  void    handle_file(char *, struct stat *);
 222 static  void    handle_stdin(void);
 223 static  void    handle_stdout(void);
 224 static  void    print_ratio(off_t, off_t, FILE *);
 225 static  void    print_list(int fd, off_t, const char *, time_t);
 226 static  void    usage(void);
 227 static  void    display_version(void);
 228 #ifndef SMALL
 229 static  void    display_license(void);
 230 static  void    sigint_handler(int);
 231 #endif
 232 static  const suffixes_t *check_suffix(char *, int);
 233 static  ssize_t read_retry(int, void *, size_t);
 234
 235 #ifdef SMALL
 236 #define unlink_input(f, sb) unlink(f)
 237 #else
 238 static  off_t   cat_fd(unsigned char *, size_t, off_t *, int fd);
 239 static  void    prepend_gzip(char *, int *, char ***);
 240 static  void    handle_dir(char *);
 241 static  void    print_verbage(const char *, const char *, off_t, off_t);
 242 static  void    print_test(const char *, int);
 243 static  void    copymodes(int fd, const struct stat *, const char *file);
 244 static  int     check_outfile(const char *outfile);
 245 #endif
 246
 247 #ifndef NO_BZIP2_SUPPORT
 248 static  off_t   unbzip2(int, int, char *, size_t, off_t *);
 249 #endif
 250
 251 #ifndef NO_COMPRESS_SUPPORT
 252 static  FILE    *zdopen(int);
 253 static  off_t   zuncompress(FILE *, FILE *, char *, size_t, off_t *);
 254 #endif
 255
 256 #ifndef NO_PACK_SUPPORT
 257 static  off_t   unpack(int, int, char *, size_t, off_t *);
 258 #endif
 259
 260 int main(int, char **p);
 261
 262 #ifdef SMALL
 263 #define getopt_long(a,b,c,d,e) getopt(a,b,c)
 264 #else
 265 static const struct option longopts[] = {
 266         { "stdout",             no_argument,            0,      'c' },
 267         { "to-stdout",          no_argument,            0,      'c' },
 268         { "decompress",         no_argument,            0,      'd' },
 269         { "uncompress",         no_argument,            0,      'd' },
 270         { "force",              no_argument,            0,      'f' },
 271         { "help",               no_argument,            0,      'h' },
 272         { "keep",               no_argument,            0,      'k' },
 273         { "list",               no_argument,            0,      'l' },
 274         { "no-name",            no_argument,            0,      'n' },
 275         { "name",               no_argument,            0,      'N' },
 276         { "quiet",              no_argument,            0,      'q' },
 277         { "recursive",          no_argument,            0,      'r' },
 278         { "suffix",             required_argument,      0,      'S' },
 279         { "test",               no_argument,            0,      't' },
 280         { "verbose",            no_argument,            0,      'v' },
 281         { "version",            no_argument,            0,      'V' },
 282         { "fast",               no_argument,            0,      '1' },
 283         { "best",               no_argument,            0,      '9' },
 284         { "ascii",              no_argument,            0,      'a' },
 285         { "license",            no_argument,            0,      'L' },
 286         { NULL,                 no_argument,            0,      0 },
 287 };
 288 #endif
 289
 290 int
 291 main(int argc, char **argv)
 292 {
 293         const char *progname = getprogname();
 294 #ifndef SMALL
 295         char *gzip;
 296         int len;
 297 #endif
 298         int ch;
 299
 300 #ifndef SMALL
 301         if ((gzip = getenv("GZIP")) != NULL)
 302                 prepend_gzip(gzip, &argc, &argv);
 303         signal(SIGINT, sigint_handler);
 304 #endif
 305
 306         /*
 307          * XXX
 308          * handle being called `gunzip', `zcat' and `gzcat'
 309          */
 310         if (strcmp(progname, "gunzip") == 0)
 311                 dflag = 1;
 312         else if (strcmp(progname, "zcat") == 0 ||
 313                  strcmp(progname, "gzcat") == 0)
 314                 dflag = cflag = 1;
 315
 316 #ifdef SMALL
 317 #define OPT_LIST "123456789cdhltV"
 318 #else
 319 #define OPT_LIST "123456789acdfhklLNnqrS:tVv"
 320 #endif
 321
 322         while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) {
 323                 switch (ch) {
 324                 case '1': case '2': case '3':
 325                 case '4': case '5': case '6':
 326                 case '7': case '8': case '9':
 327                         numflag = ch - '0';
 328                         break;
 329                 case 'c':
 330                         cflag = 1;
 331                         break;
 332                 case 'd':
 333                         dflag = 1;
 334                         break;
 335                 case 'l':
 336                         lflag = 1;
 337                         dflag = 1;
 338                         break;
 339                 case 'V':
 340                         display_version();
 341                         /* NOTREACHED */
 342 #ifndef SMALL
 343                 case 'a':
 344                         fprintf(stderr, "%s: option --ascii ignored on this system\n", progname);
 345                         break;
 346                 case 'f':
 347                         fflag = 1;
 348                         break;
 349                 case 'k':
 350                         kflag = 1;
 351                         break;
 352                 case 'L':
 353                         display_license();
 354                         /* NOT REACHED */
 355                 case 'N':
 356                         nflag = 0;
 357                         Nflag = 1;
 358                         break;
 359                 case 'n':
 360                         nflag = 1;
 361                         Nflag = 0;
 362                         break;
 363                 case 'q':
 364                         qflag = 1;
 365                         break;
 366                 case 'r':
 367                         rflag = 1;
 368                         break;
 369                 case 'S':
 370                         len = strlen(optarg);
 371                         if (len != 0) {
 372                                 if (len > SUFFIX_MAXLEN)
 373                                         errx(1, "incorrect suffix: '%s': too long", optarg);
 374                                 suffixes[0].zipped = optarg;
 375                                 suffixes[0].ziplen = len;
 376                         } else {
 377                                 suffixes[NUM_SUFFIXES - 1].zipped = "";
 378                                 suffixes[NUM_SUFFIXES - 1].ziplen = 0;
 379                         }
 380                         break;
 381                 case 't':
 382                         cflag = 1;
 383                         tflag = 1;
 384                         dflag = 1;
 385                         break;
 386                 case 'v':
 387                         vflag = 1;
 388                         break;
 389 #endif
 390                 default:
 391                         usage();
 392                         /* NOTREACHED */
 393                 }
 394         }
 395         argv += optind;
 396         argc -= optind;
 397
 398         if (argc == 0) {
 399                 if (dflag)      /* stdin mode */
 400                         handle_stdin();
 401                 else            /* stdout mode */
 402                         handle_stdout();
 403         } else {
 404                 do {
 405                         handle_pathname(argv[0]);
 406                 } while (*++argv);
 407         }
 408 #ifndef SMALL
 409         if (qflag == 0 && lflag && argc > 1)
 410                 print_list(-1, 0, "(totals)", 0);
 411 #endif
 412         exit(exit_value);
 413 }
 414
 415 /* maybe print a warning */
 416 void
 417 maybe_warn(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         if (exit_value == 0)
 427                 exit_value = 1;
 428 }
 429
 430 /* ... without an errno. */
 431 void
 432 maybe_warnx(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         if (exit_value == 0)
 442                 exit_value = 1;
 443 }
 444
 445 /* maybe print an error */
 446 void
 447 maybe_err(const char *fmt, ...)
 448 {
 449         va_list ap;
 450
 451         if (qflag == 0) {
 452                 va_start(ap, fmt);
 453                 vwarn(fmt, ap);
 454                 va_end(ap);
 455         }
 456         exit(2);
 457 }
 458
 459 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT)
 460 /* ... without an errno. */
 461 void
 462 maybe_errx(const char *fmt, ...)
 463 {
 464         va_list ap;
 465
 466         if (qflag == 0) {
 467                 va_start(ap, fmt);
 468                 vwarnx(fmt, ap);
 469                 va_end(ap);
 470         }
 471         exit(2);
 472 }
 473 #endif
 474
 475 #ifndef SMALL
 476 /* split up $GZIP and prepend it to the argument list */
 477 static void
 478 prepend_gzip(char *gzip, int *argc, char ***argv)
 479 {
 480         char *s, **nargv, **ac;
 481         int nenvarg = 0, i;
 482
 483         /* scan how many arguments there are */
 484         for (s = gzip;;) {
 485                 while (*s == ' ' || *s == '\t')
 486                         s++;
 487                 if (*s == 0)
 488                         goto count_done;
 489                 nenvarg++;
 490                 while (*s != ' ' && *s != '\t')
 491                         if (*s++ == 0)
 492                                 goto count_done;
 493         }
 494 count_done:
 495         /* punt early */
 496         if (nenvarg == 0)
 497                 return;
 498
 499         *argc += nenvarg;
 500         ac = *argv;
 501
 502         nargv = (char **)malloc((*argc + 1) * sizeof(char *));
 503         if (nargv == NULL)
 504                 maybe_err("malloc");
 505
 506         /* stash this away */
 507         *argv = nargv;
 508
 509         /* copy the program name first */
 510         i = 0;
 511         nargv[i++] = *(ac++);
 512
 513         /* take a copy of $GZIP and add it to the array */
 514         s = strdup(gzip);
 515         if (s == NULL)
 516                 maybe_err("strdup");
 517         for (;;) {
 518                 /* Skip whitespaces. */
 519                 while (*s == ' ' || *s == '\t')
 520                         s++;
 521                 if (*s == 0)
 522                         goto copy_done;
 523                 nargv[i++] = s;
 524                 /* Find the end of this argument. */
 525                 while (*s != ' ' && *s != '\t')
 526                         if (*s++ == 0)
 527                                 /* Argument followed by NUL. */
 528                                 goto copy_done;
 529                 /* Terminate by overwriting ' ' or '\t' with NUL. */
 530                 *s++ = 0;
 531         }
 532 copy_done:
 533
 534         /* copy the original arguments and a NULL */
 535         while (*ac)
 536                 nargv[i++] = *(ac++);
 537         nargv[i] = NULL;
 538 }
 539 #endif
 540
 541 /* compress input to output. Return bytes read, -1 on error */
 542 static off_t
 543 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime)
 544 {
 545         z_stream z;
 546         char *outbufp, *inbufp;
 547         off_t in_tot = 0, out_tot = 0;
 548         ssize_t in_size;
 549         int i, error;
 550         uLong crc;
 551 #ifdef SMALL
 552         static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0,
 553                                  0, 0, 0, 0,
 554                                  0, OS_CODE };
 555 #endif
 556
 557         outbufp = malloc(BUFLEN);
 558         inbufp = malloc(BUFLEN);
 559         if (outbufp == NULL || inbufp == NULL) {
 560                 maybe_err("malloc failed");
 561                 goto out;
 562         }
 563
 564         memset(&z, 0, sizeof z);
 565         z.zalloc = Z_NULL;
 566         z.zfree = Z_NULL;
 567         z.opaque = 0;
 568
 569 #ifdef SMALL
 570         memcpy(outbufp, header, sizeof header);
 571         i = sizeof header;
 572 #else
 573         if (nflag != 0) {
 574                 mtime = 0;
 575                 origname = "";
 576         }
 577
 578         i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s",
 579                      GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED,
 580                      *origname ? ORIG_NAME : 0,
 581                      mtime & 0xff,
 582                      (mtime >> 8) & 0xff,
 583                      (mtime >> 16) & 0xff,
 584                      (mtime >> 24) & 0xff,
 585                      numflag == 1 ? 4 : numflag == 9 ? 2 : 0,
 586                      OS_CODE, origname);
 587         if (i >= BUFLEN)
 588                 /* this need PATH_MAX > BUFLEN ... */
 589                 maybe_err("snprintf");
 590         if (*origname)
 591                 i++;
 592 #endif
 593
 594         z.next_out = (unsigned char *)outbufp + i;
 595         z.avail_out = BUFLEN - i;
 596
 597         error = deflateInit2(&z, numflag, Z_DEFLATED,
 598                              (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY);
 599         if (error != Z_OK) {
 600                 maybe_warnx("deflateInit2 failed");
 601                 in_tot = -1;
 602                 goto out;
 603         }
 604
 605         crc = crc32(0L, Z_NULL, 0);
 606         for (;;) {
 607                 if (z.avail_out == 0) {
 608                         if (write(out, outbufp, BUFLEN) != BUFLEN) {
 609                                 maybe_warn("write");
 610                                 out_tot = -1;
 611                                 goto out;
 612                         }
 613
 614                         out_tot += BUFLEN;
 615                         z.next_out = (unsigned char *)outbufp;
 616                         z.avail_out = BUFLEN;
 617                 }
 618
 619                 if (z.avail_in == 0) {
 620                         in_size = read(in, inbufp, BUFLEN);
 621                         if (in_size < 0) {
 622                                 maybe_warn("read");
 623                                 in_tot = -1;
 624                                 goto out;
 625                         }
 626                         if (in_size == 0)
 627                                 break;
 628
 629                         crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size);
 630                         in_tot += in_size;
 631                         z.next_in = (unsigned char *)inbufp;
 632                         z.avail_in = in_size;
 633                 }
 634
 635                 error = deflate(&z, Z_NO_FLUSH);
 636                 if (error != Z_OK && error != Z_STREAM_END) {
 637                         maybe_warnx("deflate failed");
 638                         in_tot = -1;
 639                         goto out;
 640                 }
 641         }
 642
 643         /* clean up */
 644         for (;;) {
 645                 size_t len;
 646                 ssize_t w;
 647
 648                 error = deflate(&z, Z_FINISH);
 649                 if (error != Z_OK && error != Z_STREAM_END) {
 650                         maybe_warnx("deflate failed");
 651                         in_tot = -1;
 652                         goto out;
 653                 }
 654
 655                 len = (char *)z.next_out - outbufp;
 656
 657                 w = write(out, outbufp, len);
 658                 if (w == -1 || (size_t)w != len) {
 659                         maybe_warn("write");
 660                         out_tot = -1;
 661                         goto out;
 662                 }
 663                 out_tot += len;
 664                 z.next_out = (unsigned char *)outbufp;
 665                 z.avail_out = BUFLEN;
 666
 667                 if (error == Z_STREAM_END)
 668                         break;
 669         }
 670
 671         if (deflateEnd(&z) != Z_OK) {
 672                 maybe_warnx("deflateEnd failed");
 673                 in_tot = -1;
 674                 goto out;
 675         }
 676
 677         i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c",
 678                  (int)crc & 0xff,
 679                  (int)(crc >> 8) & 0xff,
 680                  (int)(crc >> 16) & 0xff,
 681                  (int)(crc >> 24) & 0xff,
 682                  (int)in_tot & 0xff,
 683                  (int)(in_tot >> 8) & 0xff,
 684                  (int)(in_tot >> 16) & 0xff,
 685                  (int)(in_tot >> 24) & 0xff);
 686         if (i != 8)
 687                 maybe_err("snprintf");
 688         if (write(out, outbufp, i) != i) {
 689                 maybe_warn("write");
 690                 in_tot = -1;
 691         } else
 692                 out_tot += i;
 693
 694 out:
 695         if (inbufp != NULL)
 696                 free(inbufp);
 697         if (outbufp != NULL)
 698                 free(outbufp);
 699         if (gsizep)
 700                 *gsizep = out_tot;
 701         return in_tot;
 702 }
 703
 704 /*
 705  * uncompress input to output then close the input.  return the
 706  * uncompressed size written, and put the compressed sized read
 707  * into `*gsizep'.
 708  */
 709 static off_t
 710 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
 711               const char *filename)
 712 {
 713         z_stream z;
 714         char *outbufp, *inbufp;
 715         off_t out_tot = -1, in_tot = 0;
 716         uint32_t out_sub_tot = 0;
 717         enum {
 718                 GZSTATE_MAGIC0,
 719                 GZSTATE_MAGIC1,
 720                 GZSTATE_METHOD,
 721                 GZSTATE_FLAGS,
 722                 GZSTATE_SKIPPING,
 723                 GZSTATE_EXTRA,
 724                 GZSTATE_EXTRA2,
 725                 GZSTATE_EXTRA3,
 726                 GZSTATE_ORIGNAME,
 727                 GZSTATE_COMMENT,
 728                 GZSTATE_HEAD_CRC1,
 729                 GZSTATE_HEAD_CRC2,
 730                 GZSTATE_INIT,
 731                 GZSTATE_READ,
 732                 GZSTATE_CRC,
 733                 GZSTATE_LEN,
 734         } state = GZSTATE_MAGIC0;
 735         int flags = 0, skip_count = 0;
 736         int error = Z_STREAM_ERROR, done_reading = 0;
 737         uLong crc = 0;
 738         ssize_t wr;
 739         int needmore = 0;
 740
 741 #define ADVANCE()       { z.next_in++; z.avail_in--; }
 742
 743         if ((outbufp = malloc(BUFLEN)) == NULL) {
 744                 maybe_err("malloc failed");
 745                 goto out2;
 746         }
 747         if ((inbufp = malloc(BUFLEN)) == NULL) {
 748                 maybe_err("malloc failed");
 749                 goto out1;
 750         }
 751
 752         memset(&z, 0, sizeof z);
 753         z.avail_in = prelen;
 754         z.next_in = (unsigned char *)pre;
 755         z.avail_out = BUFLEN;
 756         z.next_out = (unsigned char *)outbufp;
 757         z.zalloc = NULL;
 758         z.zfree = NULL;
 759         z.opaque = 0;
 760
 761         in_tot = prelen;
 762         out_tot = 0;
 763
 764         for (;;) {
 765                 if ((z.avail_in == 0 || needmore) && done_reading == 0) {
 766                         ssize_t in_size;
 767
 768                         if (z.avail_in > 0) {
 769                                 memmove(inbufp, z.next_in, z.avail_in);
 770                         }
 771                         z.next_in = (unsigned char *)inbufp;
 772                         in_size = read(in, z.next_in + z.avail_in,
 773                             BUFLEN - z.avail_in);
 774
 775                         if (in_size == -1) {
 776                                 maybe_warn("failed to read stdin");
 777                                 goto stop_and_fail;
 778                         } else if (in_size == 0) {
 779                                 done_reading = 1;
 780                         }
 781
 782                         z.avail_in += in_size;
 783                         needmore = 0;
 784
 785                         in_tot += in_size;
 786                 }
 787                 if (z.avail_in == 0) {
 788                         if (done_reading && state != GZSTATE_MAGIC0) {
 789                                 maybe_warnx("%s: unexpected end of file",
 790                                             filename);
 791                                 goto stop_and_fail;
 792                         }
 793                         goto stop;
 794                 }
 795                 switch (state) {
 796                 case GZSTATE_MAGIC0:
 797                         if (*z.next_in != GZIP_MAGIC0) {
 798                                 if (in_tot > 0) {
 799                                         maybe_warnx("%s: trailing garbage "
 800                                                     "ignored", filename);
 801                                         goto stop;
 802                                 }
 803                                 maybe_warnx("input not gziped (MAGIC0)");
 804                                 goto stop_and_fail;
 805                         }
 806                         ADVANCE();
 807                         state++;
 808                         out_sub_tot = 0;
 809                         crc = crc32(0L, Z_NULL, 0);
 810                         break;
 811
 812                 case GZSTATE_MAGIC1:
 813                         if (*z.next_in != GZIP_MAGIC1 &&
 814                             *z.next_in != GZIP_OMAGIC1) {
 815                                 maybe_warnx("input not gziped (MAGIC1)");
 816                                 goto stop_and_fail;
 817                         }
 818                         ADVANCE();
 819                         state++;
 820                         break;
 821
 822                 case GZSTATE_METHOD:
 823                         if (*z.next_in != Z_DEFLATED) {
 824                                 maybe_warnx("unknown compression method");
 825                                 goto stop_and_fail;
 826                         }
 827                         ADVANCE();
 828                         state++;
 829                         break;
 830
 831                 case GZSTATE_FLAGS:
 832                         flags = *z.next_in;
 833                         ADVANCE();
 834                         skip_count = 6;
 835                         state++;
 836                         break;
 837
 838                 case GZSTATE_SKIPPING:
 839                         if (skip_count > 0) {
 840                                 skip_count--;
 841                                 ADVANCE();
 842                         } else
 843                                 state++;
 844                         break;
 845
 846                 case GZSTATE_EXTRA:
 847                         if ((flags & EXTRA_FIELD) == 0) {
 848                                 state = GZSTATE_ORIGNAME;
 849                                 break;
 850                         }
 851                         skip_count = *z.next_in;
 852                         ADVANCE();
 853                         state++;
 854                         break;
 855
 856                 case GZSTATE_EXTRA2:
 857                         skip_count |= ((*z.next_in) << 8);
 858                         ADVANCE();
 859                         state++;
 860                         break;
 861
 862                 case GZSTATE_EXTRA3:
 863                         if (skip_count > 0) {
 864                                 skip_count--;
 865                                 ADVANCE();
 866                         } else
 867                                 state++;
 868                         break;
 869
 870                 case GZSTATE_ORIGNAME:
 871                         if ((flags & ORIG_NAME) == 0) {
 872                                 state++;
 873                                 break;
 874                         }
 875                         if (*z.next_in == 0)
 876                                 state++;
 877                         ADVANCE();
 878                         break;
 879
 880                 case GZSTATE_COMMENT:
 881                         if ((flags & COMMENT) == 0) {
 882                                 state++;
 883                                 break;
 884                         }
 885                         if (*z.next_in == 0)
 886                                 state++;
 887                         ADVANCE();
 888                         break;
 889
 890                 case GZSTATE_HEAD_CRC1:
 891                         if (flags & HEAD_CRC)
 892                                 skip_count = 2;
 893                         else
 894                                 skip_count = 0;
 895                         state++;
 896                         break;
 897
 898                 case GZSTATE_HEAD_CRC2:
 899                         if (skip_count > 0) {
 900                                 skip_count--;
 901                                 ADVANCE();
 902                         } else
 903                                 state++;
 904                         break;
 905
 906                 case GZSTATE_INIT:
 907                         if (inflateInit2(&z, -MAX_WBITS) != Z_OK) {
 908                                 maybe_warnx("failed to inflateInit");
 909                                 goto stop_and_fail;
 910                         }
 911                         state++;
 912                         break;
 913
 914                 case GZSTATE_READ:
 915                         error = inflate(&z, Z_FINISH);
 916                         switch (error) {
 917                         /* Z_BUF_ERROR goes with Z_FINISH... */
 918                         case Z_BUF_ERROR:
 919                         case Z_STREAM_END:
 920                         case Z_OK:
 921                                 break;
 922
 923                         case Z_NEED_DICT:
 924                                 maybe_warnx("Z_NEED_DICT error");
 925                                 goto stop_and_fail;
 926                         case Z_DATA_ERROR:
 927                                 maybe_warnx("data stream error");
 928                                 goto stop_and_fail;
 929                         case Z_STREAM_ERROR:
 930                                 maybe_warnx("internal stream error");
 931                                 goto stop_and_fail;
 932                         case Z_MEM_ERROR:
 933                                 maybe_warnx("memory allocation error");
 934                                 goto stop_and_fail;
 935
 936                         default:
 937                                 maybe_warn("unknown error from inflate(): %d",
 938                                     error);
 939                         }
 940                         wr = BUFLEN - z.avail_out;
 941
 942                         if (wr != 0) {
 943                                 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr);
 944                                 if (
 945 #ifndef SMALL
 946                                     /* don't write anything with -t */
 947                                     tflag == 0 &&
 948 #endif
 949                                     write(out, outbufp, wr) != wr) {
 950                                         maybe_warn("error writing to output");
 951                                         goto stop_and_fail;
 952                                 }
 953
 954                                 out_tot += wr;
 955                                 out_sub_tot += wr;
 956                         }
 957
 958                         if (error == Z_STREAM_END) {
 959                                 inflateEnd(&z);
 960                                 state++;
 961                         }
 962
 963                         z.next_out = (unsigned char *)outbufp;
 964                         z.avail_out = BUFLEN;
 965
 966                         break;
 967                 case GZSTATE_CRC:
 968                         {
 969                                 uLong origcrc;
 970
 971                                 if (z.avail_in < 4) {
 972                                         if (!done_reading) {
 973                                                 needmore = 1;
 974                                                 continue;
 975                                         }
 976                                         maybe_warnx("truncated input");
 977                                         goto stop_and_fail;
 978                                 }
 979                                 origcrc = ((unsigned)z.next_in[0] & 0xff) |
 980                                         ((unsigned)z.next_in[1] & 0xff) << 8 |
 981                                         ((unsigned)z.next_in[2] & 0xff) << 16 |
 982                                         ((unsigned)z.next_in[3] & 0xff) << 24;
 983                                 if (origcrc != crc) {
 984                                         maybe_warnx("invalid compressed"
 985                                              " data--crc error");
 986                                         goto stop_and_fail;
 987                                 }
 988                         }
 989
 990                         z.avail_in -= 4;
 991                         z.next_in += 4;
 992
 993                         if (!z.avail_in && done_reading) {
 994                                 goto stop;
 995                         }
 996                         state++;
 997                         break;
 998                 case GZSTATE_LEN:
 999                         {
1000                                 uLong origlen;
1001
1002                                 if (z.avail_in < 4) {
1003                                         if (!done_reading) {
1004                                                 needmore = 1;
1005                                                 continue;
1006                                         }
1007                                         maybe_warnx("truncated input");
1008                                         goto stop_and_fail;
1009                                 }
1010                                 origlen = ((unsigned)z.next_in[0] & 0xff) |
1011                                         ((unsigned)z.next_in[1] & 0xff) << 8 |
1012                                         ((unsigned)z.next_in[2] & 0xff) << 16 |
1013                                         ((unsigned)z.next_in[3] & 0xff) << 24;
1014
1015                                 if (origlen != out_sub_tot) {
1016                                         maybe_warnx("invalid compressed"
1017                                              " data--length error");
1018                                         goto stop_and_fail;
1019                                 }
1020                         }
1021
1022                         z.avail_in -= 4;
1023                         z.next_in += 4;
1024
1025                         if (error < 0) {
1026                                 maybe_warnx("decompression error");
1027                                 goto stop_and_fail;
1028                         }
1029                         state = GZSTATE_MAGIC0;
1030                         break;
1031                 }
1032                 continue;
1033 stop_and_fail:
1034                 out_tot = -1;
1035 stop:
1036                 break;
1037         }
1038         if (state > GZSTATE_INIT)
1039                 inflateEnd(&z);
1040
1041         free(inbufp);
1042 out1:
1043         free(outbufp);
1044 out2:
1045         if (gsizep)
1046                 *gsizep = in_tot;
1047         return (out_tot);
1048 }
1049
1050 #ifndef SMALL
1051 /*
1052  * set the owner, mode, flags & utimes using the given file descriptor.
1053  * file is only used in possible warning messages.
1054  */
1055 static void
1056 copymodes(int fd, const struct stat *sbp, const char *file)
1057 {
1058         struct timeval times[2];
1059         struct stat sb;
1060
1061         /*
1062          * If we have no info on the input, give this file some
1063          * default values and return..
1064          */
1065         if (sbp == NULL) {
1066                 mode_t mask = umask(022);
1067
1068                 (void)fchmod(fd, DEFFILEMODE & ~mask);
1069                 (void)umask(mask);
1070                 return;
1071         }
1072         sb = *sbp;
1073
1074         /* if the chown fails, remove set-id bits as-per compress(1) */
1075         if (fchown(fd, sb.st_uid, sb.st_gid) < 0) {
1076                 if (errno != EPERM)
1077                         maybe_warn("couldn't fchown: %s", file);
1078                 sb.st_mode &= ~(S_ISUID|S_ISGID);
1079         }
1080
1081         /* we only allow set-id and the 9 normal permission bits */
1082         sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
1083         if (fchmod(fd, sb.st_mode) < 0)
1084                 maybe_warn("couldn't fchmod: %s", file);
1085
1086         TIMESPEC_TO_TIMEVAL(&times[0], &sb.st_atimespec);
1087         TIMESPEC_TO_TIMEVAL(&times[1], &sb.st_mtimespec);
1088         if (futimes(fd, times) < 0)
1089                 maybe_warn("couldn't utimes: %s", file);
1090
1091         /* only try flags if they exist already */
1092         if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0)
1093                 maybe_warn("couldn't fchflags: %s", file);
1094 }
1095 #endif
1096
1097 /* what sort of file is this? */
1098 static enum filetype
1099 file_gettype(u_char *buf)
1100 {
1101
1102         if (buf[0] == GZIP_MAGIC0 &&
1103             (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
1104                 return FT_GZIP;
1105         else
1106 #ifndef NO_BZIP2_SUPPORT
1107         if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
1108             buf[3] >= '0' && buf[3] <= '9')
1109                 return FT_BZIP2;
1110         else
1111 #endif
1112 #ifndef NO_COMPRESS_SUPPORT
1113         if (memcmp(buf, Z_MAGIC, 2) == 0)
1114                 return FT_Z;
1115         else
1116 #endif
1117 #ifndef NO_PACK_SUPPORT
1118         if (memcmp(buf, PACK_MAGIC, 2) == 0)
1119                 return FT_PACK;
1120         else
1121 #endif
1122                 return FT_UNKNOWN;
1123 }
1124
1125 #ifndef SMALL
1126 /* check the outfile is OK. */
1127 static int
1128 check_outfile(const char *outfile)
1129 {
1130         struct stat sb;
1131         int ok = 1;
1132
1133         if (lflag == 0 && stat(outfile, &sb) == 0) {
1134                 if (fflag)
1135                         unlink(outfile);
1136                 else if (isatty(STDIN_FILENO)) {
1137                         char ans[10] = { 'n', '\0' };   /* default */
1138
1139                         fprintf(stderr, "%s already exists -- do you wish to "
1140                                         "overwrite (y or n)? " , outfile);
1141                         (void)fgets(ans, sizeof(ans) - 1, stdin);
1142                         if (ans[0] != 'y' && ans[0] != 'Y') {
1143                                 fprintf(stderr, "\tnot overwriting\n");
1144                                 ok = 0;
1145                         } else
1146                                 unlink(outfile);
1147                 } else {
1148                         maybe_warnx("%s already exists -- skipping", outfile);
1149                         ok = 0;
1150                 }
1151         }
1152         return ok;
1153 }
1154
1155 static void
1156 unlink_input(const char *file, const struct stat *sb)
1157 {
1158         struct stat nsb;
1159
1160         if (kflag)
1161                 return;
1162         if (stat(file, &nsb) != 0)
1163                 /* Must be gone alrady */
1164                 return;
1165         if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
1166                 /* Definitely a different file */
1167                 return;
1168         unlink(file);
1169 }
1170
1171 static void
1172 sigint_handler(int signo __unused)
1173 {
1174
1175         if (remove_file != NULL)
1176                 unlink(remove_file);
1177         _exit(2);
1178 }
1179 #endif
1180
1181 static const suffixes_t *
1182 check_suffix(char *file, int xlate)
1183 {
1184         const suffixes_t *s;
1185         int len = strlen(file);
1186         char *sp;
1187
1188         for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
1189                 /* if it doesn't fit in "a.suf", don't bother */
1190                 if (s->ziplen >= len)
1191                         continue;
1192                 sp = file + len - s->ziplen;
1193                 if (strcmp(s->zipped, sp) != 0)
1194                         continue;
1195                 if (xlate)
1196                         strcpy(sp, s->normal);
1197                 return s;
1198         }
1199         return NULL;
1200 }
1201
1202 /*
1203  * compress the given file: create a corresponding .gz file and remove the
1204  * original.
1205  */
1206 static off_t
1207 file_compress(char *file, char *outfile, size_t outsize)
1208 {
1209         int in;
1210         int out;
1211         off_t size, insize;
1212 #ifndef SMALL
1213         struct stat isb, osb;
1214         const suffixes_t *suff;
1215 #endif
1216
1217         in = open(file, O_RDONLY);
1218         if (in == -1) {
1219                 maybe_warn("can't open %s", file);
1220                 return (-1);
1221         }
1222
1223 #ifndef SMALL
1224         if (fstat(in, &isb) != 0) {
1225                 maybe_warn("couldn't stat: %s", file);
1226                 close(in);
1227                 return (-1);
1228         }
1229 #endif
1230
1231         if (cflag == 0) {
1232 #ifndef SMALL
1233                 if (isb.st_nlink > 1 && fflag == 0) {
1234                         maybe_warnx("%s has %d other link%s -- skipping",
1235                             file, isb.st_nlink - 1,
1236                             (isb.st_nlink - 1) == 1 ? "" : "s");
1237                         close(in);
1238                         return (-1);
1239                 }
1240
1241                 if (fflag == 0 && (suff = check_suffix(file, 0)) &&
1242                     suff->zipped[0] != 0) {
1243                         maybe_warnx("%s already has %s suffix -- unchanged",
1244                             file, suff->zipped);
1245                         close(in);
1246                         return (-1);
1247                 }
1248 #endif
1249
1250                 /* Add (usually) .gz to filename */
1251                 if ((size_t)snprintf(outfile, outsize, "%s%s",
1252                     file, suffixes[0].zipped) >= outsize)
1253                         memcpy(outfile + outsize - suffixes[0].ziplen - 1,
1254                             suffixes[0].zipped, suffixes[0].ziplen + 1);
1255
1256 #ifndef SMALL
1257                 if (check_outfile(outfile) == 0) {
1258                         close(in);
1259                         return (-1);
1260                 }
1261 #endif
1262         }
1263
1264         if (cflag == 0) {
1265                 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
1266                 if (out == -1) {
1267                         maybe_warn("could not create output: %s", outfile);
1268                         fclose(stdin);
1269                         return (-1);
1270                 }
1271 #ifndef SMALL
1272                 remove_file = outfile;
1273 #endif
1274         } else
1275                 out = STDOUT_FILENO;
1276
1277         insize = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
1278
1279         (void)close(in);
1280
1281         /*
1282          * If there was an error, insize will be -1.
1283          * If we compressed to stdout, just return the size.
1284          * Otherwise stat the file and check it is the correct size.
1285          * We only blow away the file if we can stat the output and it
1286          * has the expected size.
1287          */
1288         if (cflag != 0)
1289                 return (insize == -1 ? -1 : size);
1290
1291 #ifndef SMALL
1292         if (fstat(out, &osb) != 0) {
1293                 maybe_warn("couldn't stat: %s", outfile);
1294                 goto bad_outfile;
1295         }
1296
1297         if (osb.st_size != size) {
1298                 maybe_warnx("output file: %s wrong size (%ju != %ju), deleting",
1299                     outfile, (uintmax_t)osb.st_size, (uintmax_t)size);
1300                 goto bad_outfile;
1301         }
1302
1303         copymodes(out, &isb, outfile);
1304         remove_file = NULL;
1305 #endif
1306         if (close(out) == -1)
1307                 maybe_warn("couldn't close output");
1308
1309         /* output is good, ok to delete input */
1310         unlink_input(file, &isb);
1311         return (size);
1312
1313 #ifndef SMALL
1314     bad_outfile:
1315         if (close(out) == -1)
1316                 maybe_warn("couldn't close output");
1317
1318         maybe_warnx("leaving original %s", file);
1319         unlink(outfile);
1320         return (size);
1321 #endif
1322 }
1323
1324 /* uncompress the given file and remove the original */
1325 static off_t
1326 file_uncompress(char *file, char *outfile, size_t outsize)
1327 {
1328         struct stat isb, osb;
1329         off_t size;
1330         ssize_t rbytes;
1331         unsigned char header1[4];
1332         enum filetype method;
1333         int fd, ofd, zfd = -1;
1334 #ifndef SMALL
1335         ssize_t rv;
1336         time_t timestamp = 0;
1337         unsigned char name[PATH_MAX + 1];
1338 #endif
1339
1340         /* gather the old name info */
1341
1342         fd = open(file, O_RDONLY);
1343         if (fd < 0) {
1344                 maybe_warn("can't open %s", file);
1345                 goto lose;
1346         }
1347
1348         strlcpy(outfile, file, outsize);
1349         if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
1350                 maybe_warnx("%s: unknown suffix -- ignored", file);
1351                 goto lose;
1352         }
1353
1354         rbytes = read(fd, header1, sizeof header1);
1355         if (rbytes != sizeof header1) {
1356                 /* we don't want to fail here. */
1357 #ifndef SMALL
1358                 if (fflag)
1359                         goto lose;
1360 #endif
1361                 if (rbytes == -1)
1362                         maybe_warn("can't read %s", file);
1363                 else
1364                         goto unexpected_EOF;
1365                 goto lose;
1366         }
1367
1368         method = file_gettype(header1);
1369
1370 #ifndef SMALL
1371         if (fflag == 0 && method == FT_UNKNOWN) {
1372                 maybe_warnx("%s: not in gzip format", file);
1373                 goto lose;
1374         }
1375
1376 #endif
1377
1378 #ifndef SMALL
1379         if (method == FT_GZIP && Nflag) {
1380                 unsigned char ts[4];    /* timestamp */
1381
1382                 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP);
1383                 if (rv >= 0 && rv < (ssize_t)(sizeof ts))
1384                         goto unexpected_EOF;
1385                 if (rv == -1) {
1386                         if (!fflag)
1387                                 maybe_warn("can't read %s", file);
1388                         goto lose;
1389                 }
1390                 timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0];
1391
1392                 if (header1[3] & ORIG_NAME) {
1393                         rbytes = pread(fd, name, sizeof name, GZIP_ORIGNAME);
1394                         if (rbytes < 0) {
1395                                 maybe_warn("can't read %s", file);
1396                                 goto lose;
1397                         }
1398                         if (name[0] != 0) {
1399                                 /* preserve original directory name */
1400                                 char *dp = strrchr(file, '/');
1401                                 if (dp == NULL)
1402                                         dp = file;
1403                                 else
1404                                         dp++;
1405                                 snprintf(outfile, outsize, "%.*s%.*s",
1406                                                 (int) (dp - file),
1407                                                 file, (int) rbytes, name);
1408                         }
1409                 }
1410         }
1411 #endif
1412         lseek(fd, 0, SEEK_SET);
1413
1414         if (cflag == 0 || lflag) {
1415                 if (fstat(fd, &isb) != 0)
1416                         goto lose;
1417 #ifndef SMALL
1418                 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
1419                         maybe_warnx("%s has %d other links -- skipping",
1420                             file, isb.st_nlink - 1);
1421                         goto lose;
1422                 }
1423                 if (nflag == 0 && timestamp)
1424                         isb.st_mtime = timestamp;
1425                 if (check_outfile(outfile) == 0)
1426                         goto lose;
1427 #endif
1428         }
1429
1430         if (cflag == 0 && lflag == 0) {
1431                 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
1432                 if (zfd == STDOUT_FILENO) {
1433                         /* We won't close STDOUT_FILENO later... */
1434                         zfd = dup(zfd);
1435                         close(STDOUT_FILENO);
1436                 }
1437                 if (zfd == -1) {
1438                         maybe_warn("can't open %s", outfile);
1439                         goto lose;
1440                 }
1441 #ifndef SMALL
1442                 remove_file = outfile;
1443 #endif
1444         } else
1445                 zfd = STDOUT_FILENO;
1446
1447 #ifndef NO_BZIP2_SUPPORT
1448         if (method == FT_BZIP2) {
1449
1450                 /* XXX */
1451                 if (lflag) {
1452                         maybe_warnx("no -l with bzip2 files");
1453                         goto lose;
1454                 }
1455
1456                 size = unbzip2(fd, zfd, NULL, 0, NULL);
1457         } else
1458 #endif
1459
1460 #ifndef NO_COMPRESS_SUPPORT
1461         if (method == FT_Z) {
1462                 FILE *in, *out;
1463
1464                 /* XXX */
1465                 if (lflag) {
1466                         maybe_warnx("no -l with Lempel-Ziv files");
1467                         goto lose;
1468                 }
1469
1470                 if ((in = zdopen(fd)) == NULL) {
1471                         maybe_warn("zdopen for read: %s", file);
1472                         goto lose;
1473                 }
1474
1475                 out = fdopen(dup(zfd), "w");
1476                 if (out == NULL) {
1477                         maybe_warn("fdopen for write: %s", outfile);
1478                         fclose(in);
1479                         goto lose;
1480                 }
1481
1482                 size = zuncompress(in, out, NULL, 0, NULL);
1483                 /* need to fclose() if ferror() is true... */
1484                 if (ferror(in) | fclose(in)) {
1485                         maybe_warn("failed infile fclose");
1486                         unlink(outfile);
1487                         (void)fclose(out);
1488                 }
1489                 if (fclose(out) != 0) {
1490                         maybe_warn("failed outfile fclose");
1491                         unlink(outfile);
1492                         goto lose;
1493                 }
1494         } else
1495 #endif
1496
1497 #ifndef NO_PACK_SUPPORT
1498         if (method == FT_PACK) {
1499                 if (lflag) {
1500                         maybe_warnx("no -l with packed files");
1501                         goto lose;
1502                 }
1503
1504                 size = unpack(fd, zfd, NULL, 0, NULL);
1505         } else
1506 #endif
1507
1508 #ifndef SMALL
1509         if (method == FT_UNKNOWN) {
1510                 if (lflag) {
1511                         maybe_warnx("no -l for unknown filetypes");
1512                         goto lose;
1513                 }
1514                 size = cat_fd(NULL, 0, NULL, fd);
1515         } else
1516 #endif
1517         {
1518                 if (lflag) {
1519                         print_list(fd, isb.st_size, outfile, isb.st_mtime);
1520                         close(fd);
1521                         return -1;      /* XXX */
1522                 }
1523
1524                 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
1525         }
1526
1527         if (close(fd) != 0)
1528                 maybe_warn("couldn't close input");
1529         if (zfd != STDOUT_FILENO && close(zfd) != 0)
1530                 maybe_warn("couldn't close output");
1531
1532         if (size == -1) {
1533                 if (cflag == 0)
1534                         unlink(outfile);
1535                 maybe_warnx("%s: uncompress failed", file);
1536                 return -1;
1537         }
1538
1539         /* if testing, or we uncompressed to stdout, this is all we need */
1540 #ifndef SMALL
1541         if (tflag)
1542                 return size;
1543 #endif
1544         /* if we are uncompressing to stdin, don't remove the file. */
1545         if (cflag)
1546                 return size;
1547
1548         /*
1549          * if we create a file...
1550          */
1551         /*
1552          * if we can't stat the file don't remove the file.
1553          */
1554
1555         ofd = open(outfile, O_RDWR, 0);
1556         if (ofd == -1) {
1557                 maybe_warn("couldn't open (leaving original): %s",
1558                            outfile);
1559                 return -1;
1560         }
1561         if (fstat(ofd, &osb) != 0) {
1562                 maybe_warn("couldn't stat (leaving original): %s",
1563                            outfile);
1564                 close(ofd);
1565                 return -1;
1566         }
1567         if (osb.st_size != size) {
1568                 maybe_warnx("stat gave different size: %ju != %ju (leaving original)",
1569                     (uintmax_t)size, (uintmax_t)osb.st_size);
1570                 close(ofd);
1571                 unlink(outfile);
1572                 return -1;
1573         }
1574 #ifndef SMALL
1575         copymodes(ofd, &isb, outfile);
1576         remove_file = NULL;
1577 #endif
1578         close(ofd);
1579         unlink_input(file, &isb);
1580         return size;
1581
1582     unexpected_EOF:
1583         maybe_warnx("%s: unexpected end of file", file);
1584     lose:
1585         if (fd != -1)
1586                 close(fd);
1587         if (zfd != -1 && zfd != STDOUT_FILENO)
1588                 close(fd);
1589         return -1;
1590 }
1591
1592 #ifndef SMALL
1593 static off_t
1594 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd)
1595 {
1596         char buf[BUFLEN];
1597         off_t in_tot;
1598         ssize_t w;
1599
1600         in_tot = count;
1601         w = write(STDOUT_FILENO, prepend, count);
1602         if (w == -1 || (size_t)w != count) {
1603                 maybe_warn("write to stdout");
1604                 return -1;
1605         }
1606         for (;;) {
1607                 ssize_t rv;
1608
1609                 rv = read(fd, buf, sizeof buf);
1610                 if (rv == 0)
1611                         break;
1612                 if (rv < 0) {
1613                         maybe_warn("read from fd %d", fd);
1614                         break;
1615                 }
1616
1617                 if (write(STDOUT_FILENO, buf, rv) != rv) {
1618                         maybe_warn("write to stdout");
1619                         break;
1620                 }
1621                 in_tot += rv;
1622         }
1623
1624         if (gsizep)
1625                 *gsizep = in_tot;
1626         return (in_tot);
1627 }
1628 #endif
1629
1630 static void
1631 handle_stdin(void)
1632 {
1633         unsigned char header1[4];
1634         off_t usize, gsize;
1635         enum filetype method;
1636         ssize_t bytes_read;
1637 #ifndef NO_COMPRESS_SUPPORT
1638         FILE *in;
1639 #endif
1640
1641 #ifndef SMALL
1642         if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
1643                 maybe_warnx("standard input is a terminal -- ignoring");
1644                 return;
1645         }
1646 #endif
1647
1648         if (lflag) {
1649                 struct stat isb;
1650
1651                 /* XXX could read the whole file, etc. */
1652                 if (fstat(STDIN_FILENO, &isb) < 0) {
1653                         maybe_warn("fstat");
1654                         return;
1655                 }
1656                 print_list(STDIN_FILENO, isb.st_size, "stdout", isb.st_mtime);
1657                 return;
1658         }
1659
1660         bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1);
1661         if (bytes_read == -1) {
1662                 maybe_warn("can't read stdin");
1663                 return;
1664         } else if (bytes_read != sizeof(header1)) {
1665                 maybe_warnx("(stdin): unexpected end of file");
1666                 return;
1667         }
1668
1669         method = file_gettype(header1);
1670         switch (method) {
1671         default:
1672 #ifndef SMALL
1673                 if (fflag == 0) {
1674                         maybe_warnx("unknown compression format");
1675                         return;
1676                 }
1677                 usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO);
1678                 break;
1679 #endif
1680         case FT_GZIP:
1681                 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
1682                               (char *)header1, sizeof header1, &gsize, "(stdin)");
1683                 break;
1684 #ifndef NO_BZIP2_SUPPORT
1685         case FT_BZIP2:
1686                 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
1687                                 (char *)header1, sizeof header1, &gsize);
1688                 break;
1689 #endif
1690 #ifndef NO_COMPRESS_SUPPORT
1691         case FT_Z:
1692                 if ((in = zdopen(STDIN_FILENO)) == NULL) {
1693                         maybe_warnx("zopen of stdin");
1694                         return;
1695                 }
1696
1697                 usize = zuncompress(in, stdout, (char *)header1, sizeof header1, &gsize);
1698                 fclose(in);
1699                 break;
1700 #endif
1701 #ifndef NO_PACK_SUPPORT
1702         case FT_PACK:
1703                 usize = unpack(STDIN_FILENO, STDOUT_FILENO,
1704                                (char *)header1, sizeof header1, &gsize);
1705                 break;
1706 #endif
1707         }
1708
1709 #ifndef SMALL
1710         if (vflag && !tflag && usize != -1 && gsize != -1)
1711                 print_verbage(NULL, NULL, usize, gsize);
1712         if (vflag && tflag)
1713                 print_test("(stdin)", usize != -1);
1714 #endif
1715
1716 }
1717
1718 static void
1719 handle_stdout(void)
1720 {
1721         off_t gsize, usize;
1722         struct stat sb;
1723         time_t systime;
1724         uint32_t mtime;
1725         int ret;
1726
1727 #ifndef SMALL
1728         if (fflag == 0 && isatty(STDOUT_FILENO)) {
1729                 maybe_warnx("standard output is a terminal -- ignoring");
1730                 return;
1731         }
1732 #endif
1733         /* If stdin is a file use it's mtime, otherwise use current time */
1734         ret = fstat(STDIN_FILENO, &sb);
1735
1736 #ifndef SMALL
1737         if (ret < 0) {
1738                 maybe_warn("Can't stat stdin");
1739                 return;
1740         }
1741 #endif
1742
1743         if (S_ISREG(sb.st_mode))
1744                 mtime = (uint32_t)sb.st_mtime;
1745         else {
1746                 systime = time(NULL);
1747 #ifndef SMALL
1748                 if (systime == -1) {
1749                         maybe_warn("time");
1750                         return;
1751                 }
1752 #endif
1753                 mtime = (uint32_t)systime;
1754         }
1755
1756         usize = gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime);
1757 #ifndef SMALL
1758         if (vflag && !tflag && usize != -1 && gsize != -1)
1759                 print_verbage(NULL, NULL, usize, gsize);
1760 #endif
1761 }
1762
1763 /* do what is asked for, for the path name */
1764 static void
1765 handle_pathname(char *path)
1766 {
1767         char *opath = path, *s = NULL;
1768         ssize_t len;
1769         int slen;
1770         struct stat sb;
1771
1772         /* check for stdout/stdin */
1773         if (path[0] == '-' && path[1] == '\0') {
1774                 if (dflag)
1775                         handle_stdin();
1776                 else
1777                         handle_stdout();
1778                 return;
1779         }
1780
1781 retry:
1782         if (stat(path, &sb) != 0) {
1783                 /* lets try <path>.gz if we're decompressing */
1784                 if (dflag && s == NULL && errno == ENOENT) {
1785                         len = strlen(path);
1786                         slen = suffixes[0].ziplen;
1787                         s = malloc(len + slen + 1);
1788                         if (s == NULL)
1789                                 maybe_err("malloc");
1790                         memcpy(s, path, len);
1791                         memcpy(s + len, suffixes[0].zipped, slen + 1);
1792                         path = s;
1793                         goto retry;
1794                 }
1795                 maybe_warn("can't stat: %s", opath);
1796                 goto out;
1797         }
1798
1799         if (S_ISDIR(sb.st_mode)) {
1800 #ifndef SMALL
1801                 if (rflag)
1802                         handle_dir(path);
1803                 else
1804 #endif
1805                         maybe_warnx("%s is a directory", path);
1806                 goto out;
1807         }
1808
1809         if (S_ISREG(sb.st_mode))
1810                 handle_file(path, &sb);
1811         else
1812                 maybe_warnx("%s is not a regular file", path);
1813
1814 out:
1815         if (s)
1816                 free(s);
1817 }
1818
1819 /* compress/decompress a file */
1820 static void
1821 handle_file(char *file, struct stat *sbp)
1822 {
1823         off_t usize, gsize;
1824         char    outfile[PATH_MAX];
1825
1826         infile = file;
1827         if (dflag) {
1828                 usize = file_uncompress(file, outfile, sizeof(outfile));
1829 #ifndef SMALL
1830                 if (vflag && tflag)
1831                         print_test(file, usize != -1);
1832 #endif
1833                 if (usize == -1)
1834                         return;
1835                 gsize = sbp->st_size;
1836         } else {
1837                 gsize = file_compress(file, outfile, sizeof(outfile));
1838                 if (gsize == -1)
1839                         return;
1840                 usize = sbp->st_size;
1841         }
1842
1843
1844 #ifndef SMALL
1845         if (vflag && !tflag)
1846                 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
1847 #endif
1848 }
1849
1850 #ifndef SMALL
1851 /* this is used with -r to recursively descend directories */
1852 static void
1853 handle_dir(char *dir)
1854 {
1855         char *path_argv[2];
1856         FTS *fts;
1857         FTSENT *entry;
1858
1859         path_argv[0] = dir;
1860         path_argv[1] = 0;
1861         fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
1862         if (fts == NULL) {
1863                 warn("couldn't fts_open %s", dir);
1864                 return;
1865         }
1866
1867         while ((entry = fts_read(fts))) {
1868                 switch(entry->fts_info) {
1869                 case FTS_D:
1870                 case FTS_DP:
1871                         continue;
1872
1873                 case FTS_DNR:
1874                 case FTS_ERR:
1875                 case FTS_NS:
1876                         maybe_warn("%s", entry->fts_path);
1877                         continue;
1878                 case FTS_F:
1879                         handle_file(entry->fts_path, entry->fts_statp);
1880                 }
1881         }
1882         (void)fts_close(fts);
1883 }
1884 #endif
1885
1886 /* print a ratio - size reduction as a fraction of uncompressed size */
1887 static void
1888 print_ratio(off_t in, off_t out, FILE *where)
1889 {
1890         int percent10;  /* 10 * percent */
1891         off_t diff;
1892         char buff[8];
1893         int len;
1894
1895         diff = in - out/2;
1896         if (diff <= 0)
1897                 /*
1898                  * Output is more than double size of input! print -99.9%
1899                  * Quite possibly we've failed to get the original size.
1900                  */
1901                 percent10 = -999;
1902         else {
1903                 /*
1904                  * We only need 12 bits of result from the final division,
1905                  * so reduce the values until a 32bit division will suffice.
1906                  */
1907                 while (in > 0x100000) {
1908                         diff >>= 1;
1909                         in >>= 1;
1910                 }
1911                 if (in != 0)
1912                         percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
1913                 else
1914                         percent10 = 0;
1915         }
1916
1917         len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
1918         /* Move the '.' to before the last digit */
1919         buff[len - 1] = buff[len - 2];
1920         buff[len - 2] = '.';
1921         fprintf(where, "%5s%%", buff);
1922 }
1923
1924 #ifndef SMALL
1925 /* print compression statistics, and the new name (if there is one!) */
1926 static void
1927 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
1928 {
1929         if (file)
1930                 fprintf(stderr, "%s:%s  ", file,
1931                     strlen(file) < 7 ? "\t\t" : "\t");
1932         print_ratio(usize, gsize, stderr);
1933         if (nfile)
1934                 fprintf(stderr, " -- replaced with %s", nfile);
1935         fprintf(stderr, "\n");
1936         fflush(stderr);
1937 }
1938
1939 /* print test results */
1940 static void
1941 print_test(const char *file, int ok)
1942 {
1943
1944         if (exit_value == 0 && ok == 0)
1945                 exit_value = 1;
1946         fprintf(stderr, "%s:%s  %s\n", file,
1947             strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
1948         fflush(stderr);
1949 }
1950 #endif
1951
1952 /* print a file's info ala --list */
1953 /* eg:
1954   compressed uncompressed  ratio uncompressed_name
1955       354841      1679360  78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
1956 */
1957 static void
1958 print_list(int fd, off_t out, const char *outfile, time_t ts)
1959 {
1960         static int first = 1;
1961 #ifndef SMALL
1962         static off_t in_tot, out_tot;
1963         uint32_t crc = 0;
1964 #endif
1965         off_t in = 0, rv;
1966
1967         if (first) {
1968 #ifndef SMALL
1969                 if (vflag)
1970                         printf("method  crc     date  time  ");
1971 #endif
1972                 if (qflag == 0)
1973                         printf("  compressed uncompressed  "
1974                                "ratio uncompressed_name\n");
1975         }
1976         first = 0;
1977
1978         /* print totals? */
1979 #ifndef SMALL
1980         if (fd == -1) {
1981                 in = in_tot;
1982                 out = out_tot;
1983         } else
1984 #endif
1985         {
1986                 /* read the last 4 bytes - this is the uncompressed size */
1987                 rv = lseek(fd, (off_t)(-8), SEEK_END);
1988                 if (rv != -1) {
1989                         unsigned char buf[8];
1990                         uint32_t usize;
1991
1992                         rv = read(fd, (char *)buf, sizeof(buf));
1993                         if (rv == -1)
1994                                 maybe_warn("read of uncompressed size");
1995                         else if (rv != sizeof(buf))
1996                                 maybe_warnx("read of uncompressed size");
1997
1998                         else {
1999                                 usize = buf[4] | buf[5] << 8 |
2000                                         buf[6] << 16 | buf[7] << 24;
2001                                 in = (off_t)usize;
2002 #ifndef SMALL
2003                                 crc = buf[0] | buf[1] << 8 |
2004                                       buf[2] << 16 | buf[3] << 24;
2005 #endif
2006                         }
2007                 }
2008         }
2009
2010 #ifndef SMALL
2011         if (vflag && fd == -1)
2012                 printf("                            ");
2013         else if (vflag) {
2014                 char *date = ctime(&ts);
2015
2016                 /* skip the day, 1/100th second, and year */
2017                 date += 4;
2018                 date[12] = 0;
2019                 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
2020         }
2021         in_tot += in;
2022         out_tot += out;
2023 #else
2024         (void)&ts;      /* XXX */
2025 #endif
2026         printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
2027         print_ratio(in, out, stdout);
2028         printf(" %s\n", outfile);
2029 }
2030
2031 /* display the usage of NetBSD gzip */
2032 static void
2033 usage(void)
2034 {
2035
2036         fprintf(stderr, "%s\n", gzip_version);
2037         fprintf(stderr,
2038 #ifdef SMALL
2039     "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n",
2040 #else
2041     "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n"
2042     " -1 --fast            fastest (worst) compression\n"
2043     " -2 .. -8             set compression level\n"
2044     " -9 --best            best (slowest) compression\n"
2045     " -c --stdout          write to stdout, keep original files\n"
2046     "    --to-stdout\n"
2047     " -d --decompress      uncompress files\n"
2048     "    --uncompress\n"
2049     " -f --force           force overwriting & compress links\n"
2050     " -h --help            display this help\n"
2051     " -k --keep            don't delete input files during operation\n"
2052     " -l --list            list compressed file contents\n"
2053     " -N --name            save or restore original file name and time stamp\n"
2054     " -n --no-name         don't save original file name or time stamp\n"
2055     " -q --quiet           output no warnings\n"
2056     " -r --recursive       recursively compress files in directories\n"
2057     " -S .suf              use suffix .suf instead of .gz\n"
2058     "    --suffix .suf\n"
2059     " -t --test            test compressed file\n"
2060     " -V --version         display program version\n"
2061     " -v --verbose         print extra statistics\n",
2062 #endif
2063             getprogname());
2064         exit(0);
2065 }
2066
2067 #ifndef SMALL
2068 /* display the license information of FreeBSD gzip */
2069 static void
2070 display_license(void)
2071 {
2072
2073         fprintf(stderr, "%s (based on NetBSD gzip 20091011)\n", gzip_version);
2074         fprintf(stderr, "%s\n", gzip_copyright);
2075         exit(0);
2076 }
2077 #endif
2078
2079 /* display the version of NetBSD gzip */
2080 static void
2081 display_version(void)
2082 {
2083
2084         fprintf(stderr, "%s\n", gzip_version);
2085         exit(0);
2086 }
2087
2088 #ifndef NO_BZIP2_SUPPORT
2089 #include "unbzip2.c"
2090 #endif
2091 #ifndef NO_COMPRESS_SUPPORT
2092 #include "zuncompress.c"
2093 #endif
2094 #ifndef NO_PACK_SUPPORT
2095 #include "unpack.c"
2096 #endif
2097
2098 static ssize_t
2099 read_retry(int fd, void *buf, size_t sz)
2100 {
2101         char *cp = buf;
2102         size_t left = MIN(sz, (size_t) SSIZE_MAX);
2103
2104         while (left > 0) {
2105                 ssize_t ret;
2106
2107                 ret = read(fd, cp, left);
2108                 if (ret == -1) {
2109                         return ret;
2110                 } else if (ret == 0) {
2111                         break; /* EOF */
2112                 }
2113                 cp += ret;
2114                 left -= ret;
2115         }
2116
2117         return sz - left;
2118 }