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                                 if (z.avail_out > 0 && !done_reading)
 920                                         continue;
 921                         case Z_STREAM_END:
 922                         case Z_OK:
 923                                 break;
 924
 925                         case Z_NEED_DICT:
 926                                 maybe_warnx("Z_NEED_DICT error");
 927                                 goto stop_and_fail;
 928                         case Z_DATA_ERROR:
 929                                 maybe_warnx("data stream error");
 930                                 goto stop_and_fail;
 931                         case Z_STREAM_ERROR:
 932                                 maybe_warnx("internal stream error");
 933                                 goto stop_and_fail;
 934                         case Z_MEM_ERROR:
 935                                 maybe_warnx("memory allocation error");
 936                                 goto stop_and_fail;
 937
 938                         default:
 939                                 maybe_warn("unknown error from inflate(): %d",
 940                                     error);
 941                         }
 942                         wr = BUFLEN - z.avail_out;
 943
 944                         if (wr != 0) {
 945                                 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr);
 946                                 if (
 947 #ifndef SMALL
 948                                     /* don't write anything with -t */
 949                                     tflag == 0 &&
 950 #endif
 951                                     write(out, outbufp, wr) != wr) {
 952                                         maybe_warn("error writing to output");
 953                                         goto stop_and_fail;
 954                                 }
 955
 956                                 out_tot += wr;
 957                                 out_sub_tot += wr;
 958                         }
 959
 960                         if (error == Z_STREAM_END) {
 961                                 inflateEnd(&z);
 962                                 state++;
 963                         }
 964
 965                         z.next_out = (unsigned char *)outbufp;
 966                         z.avail_out = BUFLEN;
 967
 968                         break;
 969                 case GZSTATE_CRC:
 970                         {
 971                                 uLong origcrc;
 972
 973                                 if (z.avail_in < 4) {
 974                                         if (!done_reading) {
 975                                                 needmore = 1;
 976                                                 continue;
 977                                         }
 978                                         maybe_warnx("truncated input");
 979                                         goto stop_and_fail;
 980                                 }
 981                                 origcrc = ((unsigned)z.next_in[0] & 0xff) |
 982                                         ((unsigned)z.next_in[1] & 0xff) << 8 |
 983                                         ((unsigned)z.next_in[2] & 0xff) << 16 |
 984                                         ((unsigned)z.next_in[3] & 0xff) << 24;
 985                                 if (origcrc != crc) {
 986                                         maybe_warnx("invalid compressed"
 987                                              " data--crc error");
 988                                         goto stop_and_fail;
 989                                 }
 990                         }
 991
 992                         z.avail_in -= 4;
 993                         z.next_in += 4;
 994
 995                         if (!z.avail_in && done_reading) {
 996                                 goto stop;
 997                         }
 998                         state++;
 999                         break;
1000                 case GZSTATE_LEN:
1001                         {
1002                                 uLong origlen;
1003
1004                                 if (z.avail_in < 4) {
1005                                         if (!done_reading) {
1006                                                 needmore = 1;
1007                                                 continue;
1008                                         }
1009                                         maybe_warnx("truncated input");
1010                                         goto stop_and_fail;
1011                                 }
1012                                 origlen = ((unsigned)z.next_in[0] & 0xff) |
1013                                         ((unsigned)z.next_in[1] & 0xff) << 8 |
1014                                         ((unsigned)z.next_in[2] & 0xff) << 16 |
1015                                         ((unsigned)z.next_in[3] & 0xff) << 24;
1016
1017                                 if (origlen != out_sub_tot) {
1018                                         maybe_warnx("invalid compressed"
1019                                              " data--length error");
1020                                         goto stop_and_fail;
1021                                 }
1022                         }
1023
1024                         z.avail_in -= 4;
1025                         z.next_in += 4;
1026
1027                         if (error < 0) {
1028                                 maybe_warnx("decompression error");
1029                                 goto stop_and_fail;
1030                         }
1031                         state = GZSTATE_MAGIC0;
1032                         break;
1033                 }
1034                 continue;
1035 stop_and_fail:
1036                 out_tot = -1;
1037 stop:
1038                 break;
1039         }
1040         if (state > GZSTATE_INIT)
1041                 inflateEnd(&z);
1042
1043         free(inbufp);
1044 out1:
1045         free(outbufp);
1046 out2:
1047         if (gsizep)
1048                 *gsizep = in_tot;
1049         return (out_tot);
1050 }
1051
1052 #ifndef SMALL
1053 /*
1054  * set the owner, mode, flags & utimes using the given file descriptor.
1055  * file is only used in possible warning messages.
1056  */
1057 static void
1058 copymodes(int fd, const struct stat *sbp, const char *file)
1059 {
1060         struct timeval times[2];
1061         struct stat sb;
1062
1063         /*
1064          * If we have no info on the input, give this file some
1065          * default values and return..
1066          */
1067         if (sbp == NULL) {
1068                 mode_t mask = umask(022);
1069
1070                 (void)fchmod(fd, DEFFILEMODE & ~mask);
1071                 (void)umask(mask);
1072                 return;
1073         }
1074         sb = *sbp;
1075
1076         /* if the chown fails, remove set-id bits as-per compress(1) */
1077         if (fchown(fd, sb.st_uid, sb.st_gid) < 0) {
1078                 if (errno != EPERM)
1079                         maybe_warn("couldn't fchown: %s", file);
1080                 sb.st_mode &= ~(S_ISUID|S_ISGID);
1081         }
1082
1083         /* we only allow set-id and the 9 normal permission bits */
1084         sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
1085         if (fchmod(fd, sb.st_mode) < 0)
1086                 maybe_warn("couldn't fchmod: %s", file);
1087
1088         TIMESPEC_TO_TIMEVAL(&times[0], &sb.st_atimespec);
1089         TIMESPEC_TO_TIMEVAL(&times[1], &sb.st_mtimespec);
1090         if (futimes(fd, times) < 0)
1091                 maybe_warn("couldn't utimes: %s", file);
1092
1093         /* only try flags if they exist already */
1094         if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0)
1095                 maybe_warn("couldn't fchflags: %s", file);
1096 }
1097 #endif
1098
1099 /* what sort of file is this? */
1100 static enum filetype
1101 file_gettype(u_char *buf)
1102 {
1103
1104         if (buf[0] == GZIP_MAGIC0 &&
1105             (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
1106                 return FT_GZIP;
1107         else
1108 #ifndef NO_BZIP2_SUPPORT
1109         if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
1110             buf[3] >= '0' && buf[3] <= '9')
1111                 return FT_BZIP2;
1112         else
1113 #endif
1114 #ifndef NO_COMPRESS_SUPPORT
1115         if (memcmp(buf, Z_MAGIC, 2) == 0)
1116                 return FT_Z;
1117         else
1118 #endif
1119 #ifndef NO_PACK_SUPPORT
1120         if (memcmp(buf, PACK_MAGIC, 2) == 0)
1121                 return FT_PACK;
1122         else
1123 #endif
1124                 return FT_UNKNOWN;
1125 }
1126
1127 #ifndef SMALL
1128 /* check the outfile is OK. */
1129 static int
1130 check_outfile(const char *outfile)
1131 {
1132         struct stat sb;
1133         int ok = 1;
1134
1135         if (lflag == 0 && stat(outfile, &sb) == 0) {
1136                 if (fflag)
1137                         unlink(outfile);
1138                 else if (isatty(STDIN_FILENO)) {
1139                         char ans[10] = { 'n', '\0' };   /* default */
1140
1141                         fprintf(stderr, "%s already exists -- do you wish to "
1142                                         "overwrite (y or n)? " , outfile);
1143                         (void)fgets(ans, sizeof(ans) - 1, stdin);
1144                         if (ans[0] != 'y' && ans[0] != 'Y') {
1145                                 fprintf(stderr, "\tnot overwriting\n");
1146                                 ok = 0;
1147                         } else
1148                                 unlink(outfile);
1149                 } else {
1150                         maybe_warnx("%s already exists -- skipping", outfile);
1151                         ok = 0;
1152                 }
1153         }
1154         return ok;
1155 }
1156
1157 static void
1158 unlink_input(const char *file, const struct stat *sb)
1159 {
1160         struct stat nsb;
1161
1162         if (kflag)
1163                 return;
1164         if (stat(file, &nsb) != 0)
1165                 /* Must be gone alrady */
1166                 return;
1167         if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
1168                 /* Definitely a different file */
1169                 return;
1170         unlink(file);
1171 }
1172
1173 static void
1174 sigint_handler(int signo __unused)
1175 {
1176
1177         if (remove_file != NULL)
1178                 unlink(remove_file);
1179         _exit(2);
1180 }
1181 #endif
1182
1183 static const suffixes_t *
1184 check_suffix(char *file, int xlate)
1185 {
1186         const suffixes_t *s;
1187         int len = strlen(file);
1188         char *sp;
1189
1190         for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
1191                 /* if it doesn't fit in "a.suf", don't bother */
1192                 if (s->ziplen >= len)
1193                         continue;
1194                 sp = file + len - s->ziplen;
1195                 if (strcmp(s->zipped, sp) != 0)
1196                         continue;
1197                 if (xlate)
1198                         strcpy(sp, s->normal);
1199                 return s;
1200         }
1201         return NULL;
1202 }
1203
1204 /*
1205  * compress the given file: create a corresponding .gz file and remove the
1206  * original.
1207  */
1208 static off_t
1209 file_compress(char *file, char *outfile, size_t outsize)
1210 {
1211         int in;
1212         int out;
1213         off_t size, insize;
1214 #ifndef SMALL
1215         struct stat isb, osb;
1216         const suffixes_t *suff;
1217 #endif
1218
1219         in = open(file, O_RDONLY);
1220         if (in == -1) {
1221                 maybe_warn("can't open %s", file);
1222                 return (-1);
1223         }
1224
1225 #ifndef SMALL
1226         if (fstat(in, &isb) != 0) {
1227                 maybe_warn("couldn't stat: %s", file);
1228                 close(in);
1229                 return (-1);
1230         }
1231 #endif
1232
1233         if (cflag == 0) {
1234 #ifndef SMALL
1235                 if (isb.st_nlink > 1 && fflag == 0) {
1236                         maybe_warnx("%s has %d other link%s -- skipping",
1237                             file, isb.st_nlink - 1,
1238                             (isb.st_nlink - 1) == 1 ? "" : "s");
1239                         close(in);
1240                         return (-1);
1241                 }
1242
1243                 if (fflag == 0 && (suff = check_suffix(file, 0)) &&
1244                     suff->zipped[0] != 0) {
1245                         maybe_warnx("%s already has %s suffix -- unchanged",
1246                             file, suff->zipped);
1247                         close(in);
1248                         return (-1);
1249                 }
1250 #endif
1251
1252                 /* Add (usually) .gz to filename */
1253                 if ((size_t)snprintf(outfile, outsize, "%s%s",
1254                     file, suffixes[0].zipped) >= outsize)
1255                         memcpy(outfile + outsize - suffixes[0].ziplen - 1,
1256                             suffixes[0].zipped, suffixes[0].ziplen + 1);
1257
1258 #ifndef SMALL
1259                 if (check_outfile(outfile) == 0) {
1260                         close(in);
1261                         return (-1);
1262                 }
1263 #endif
1264         }
1265
1266         if (cflag == 0) {
1267                 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
1268                 if (out == -1) {
1269                         maybe_warn("could not create output: %s", outfile);
1270                         fclose(stdin);
1271                         return (-1);
1272                 }
1273 #ifndef SMALL
1274                 remove_file = outfile;
1275 #endif
1276         } else
1277                 out = STDOUT_FILENO;
1278
1279         insize = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
1280
1281         (void)close(in);
1282
1283         /*
1284          * If there was an error, insize will be -1.
1285          * If we compressed to stdout, just return the size.
1286          * Otherwise stat the file and check it is the correct size.
1287          * We only blow away the file if we can stat the output and it
1288          * has the expected size.
1289          */
1290         if (cflag != 0)
1291                 return (insize == -1 ? -1 : size);
1292
1293 #ifndef SMALL
1294         if (fstat(out, &osb) != 0) {
1295                 maybe_warn("couldn't stat: %s", outfile);
1296                 goto bad_outfile;
1297         }
1298
1299         if (osb.st_size != size) {
1300                 maybe_warnx("output file: %s wrong size (%ju != %ju), deleting",
1301                     outfile, (uintmax_t)osb.st_size, (uintmax_t)size);
1302                 goto bad_outfile;
1303         }
1304
1305         copymodes(out, &isb, outfile);
1306         remove_file = NULL;
1307 #endif
1308         if (close(out) == -1)
1309                 maybe_warn("couldn't close output");
1310
1311         /* output is good, ok to delete input */
1312         unlink_input(file, &isb);
1313         return (size);
1314
1315 #ifndef SMALL
1316     bad_outfile:
1317         if (close(out) == -1)
1318                 maybe_warn("couldn't close output");
1319
1320         maybe_warnx("leaving original %s", file);
1321         unlink(outfile);
1322         return (size);
1323 #endif
1324 }
1325
1326 /* uncompress the given file and remove the original */
1327 static off_t
1328 file_uncompress(char *file, char *outfile, size_t outsize)
1329 {
1330         struct stat isb, osb;
1331         off_t size;
1332         ssize_t rbytes;
1333         unsigned char header1[4];
1334         enum filetype method;
1335         int fd, ofd, zfd = -1;
1336 #ifndef SMALL
1337         ssize_t rv;
1338         time_t timestamp = 0;
1339         unsigned char name[PATH_MAX + 1];
1340 #endif
1341
1342         /* gather the old name info */
1343
1344         fd = open(file, O_RDONLY);
1345         if (fd < 0) {
1346                 maybe_warn("can't open %s", file);
1347                 goto lose;
1348         }
1349
1350         strlcpy(outfile, file, outsize);
1351         if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
1352                 maybe_warnx("%s: unknown suffix -- ignored", file);
1353                 goto lose;
1354         }
1355
1356         rbytes = read(fd, header1, sizeof header1);
1357         if (rbytes != sizeof header1) {
1358                 /* we don't want to fail here. */
1359 #ifndef SMALL
1360                 if (fflag)
1361                         goto lose;
1362 #endif
1363                 if (rbytes == -1)
1364                         maybe_warn("can't read %s", file);
1365                 else
1366                         goto unexpected_EOF;
1367                 goto lose;
1368         }
1369
1370         method = file_gettype(header1);
1371
1372 #ifndef SMALL
1373         if (fflag == 0 && method == FT_UNKNOWN) {
1374                 maybe_warnx("%s: not in gzip format", file);
1375                 goto lose;
1376         }
1377
1378 #endif
1379
1380 #ifndef SMALL
1381         if (method == FT_GZIP && Nflag) {
1382                 unsigned char ts[4];    /* timestamp */
1383
1384                 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP);
1385                 if (rv >= 0 && rv < (ssize_t)(sizeof ts))
1386                         goto unexpected_EOF;
1387                 if (rv == -1) {
1388                         if (!fflag)
1389                                 maybe_warn("can't read %s", file);
1390                         goto lose;
1391                 }
1392                 timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0];
1393
1394                 if (header1[3] & ORIG_NAME) {
1395                         rbytes = pread(fd, name, sizeof name, GZIP_ORIGNAME);
1396                         if (rbytes < 0) {
1397                                 maybe_warn("can't read %s", file);
1398                                 goto lose;
1399                         }
1400                         if (name[0] != 0) {
1401                                 /* preserve original directory name */
1402                                 char *dp = strrchr(file, '/');
1403                                 if (dp == NULL)
1404                                         dp = file;
1405                                 else
1406                                         dp++;
1407                                 snprintf(outfile, outsize, "%.*s%.*s",
1408                                                 (int) (dp - file),
1409                                                 file, (int) rbytes, name);
1410                         }
1411                 }
1412         }
1413 #endif
1414         lseek(fd, 0, SEEK_SET);
1415
1416         if (cflag == 0 || lflag) {
1417                 if (fstat(fd, &isb) != 0)
1418                         goto lose;
1419 #ifndef SMALL
1420                 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
1421                         maybe_warnx("%s has %d other links -- skipping",
1422                             file, isb.st_nlink - 1);
1423                         goto lose;
1424                 }
1425                 if (nflag == 0 && timestamp)
1426                         isb.st_mtime = timestamp;
1427                 if (check_outfile(outfile) == 0)
1428                         goto lose;
1429 #endif
1430         }
1431
1432         if (cflag == 0 && lflag == 0) {
1433                 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
1434                 if (zfd == STDOUT_FILENO) {
1435                         /* We won't close STDOUT_FILENO later... */
1436                         zfd = dup(zfd);
1437                         close(STDOUT_FILENO);
1438                 }
1439                 if (zfd == -1) {
1440                         maybe_warn("can't open %s", outfile);
1441                         goto lose;
1442                 }
1443 #ifndef SMALL
1444                 remove_file = outfile;
1445 #endif
1446         } else
1447                 zfd = STDOUT_FILENO;
1448
1449 #ifndef NO_BZIP2_SUPPORT
1450         if (method == FT_BZIP2) {
1451
1452                 /* XXX */
1453                 if (lflag) {
1454                         maybe_warnx("no -l with bzip2 files");
1455                         goto lose;
1456                 }
1457
1458                 size = unbzip2(fd, zfd, NULL, 0, NULL);
1459         } else
1460 #endif
1461
1462 #ifndef NO_COMPRESS_SUPPORT
1463         if (method == FT_Z) {
1464                 FILE *in, *out;
1465
1466                 /* XXX */
1467                 if (lflag) {
1468                         maybe_warnx("no -l with Lempel-Ziv files");
1469                         goto lose;
1470                 }
1471
1472                 if ((in = zdopen(fd)) == NULL) {
1473                         maybe_warn("zdopen for read: %s", file);
1474                         goto lose;
1475                 }
1476
1477                 out = fdopen(dup(zfd), "w");
1478                 if (out == NULL) {
1479                         maybe_warn("fdopen for write: %s", outfile);
1480                         fclose(in);
1481                         goto lose;
1482                 }
1483
1484                 size = zuncompress(in, out, NULL, 0, NULL);
1485                 /* need to fclose() if ferror() is true... */
1486                 if (ferror(in) | fclose(in)) {
1487                         maybe_warn("failed infile fclose");
1488                         unlink(outfile);
1489                         (void)fclose(out);
1490                 }
1491                 if (fclose(out) != 0) {
1492                         maybe_warn("failed outfile fclose");
1493                         unlink(outfile);
1494                         goto lose;
1495                 }
1496         } else
1497 #endif
1498
1499 #ifndef NO_PACK_SUPPORT
1500         if (method == FT_PACK) {
1501                 if (lflag) {
1502                         maybe_warnx("no -l with packed files");
1503                         goto lose;
1504                 }
1505
1506                 size = unpack(fd, zfd, NULL, 0, NULL);
1507         } else
1508 #endif
1509
1510 #ifndef SMALL
1511         if (method == FT_UNKNOWN) {
1512                 if (lflag) {
1513                         maybe_warnx("no -l for unknown filetypes");
1514                         goto lose;
1515                 }
1516                 size = cat_fd(NULL, 0, NULL, fd);
1517         } else
1518 #endif
1519         {
1520                 if (lflag) {
1521                         print_list(fd, isb.st_size, outfile, isb.st_mtime);
1522                         close(fd);
1523                         return -1;      /* XXX */
1524                 }
1525
1526                 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
1527         }
1528
1529         if (close(fd) != 0)
1530                 maybe_warn("couldn't close input");
1531         if (zfd != STDOUT_FILENO && close(zfd) != 0)
1532                 maybe_warn("couldn't close output");
1533
1534         if (size == -1) {
1535                 if (cflag == 0)
1536                         unlink(outfile);
1537                 maybe_warnx("%s: uncompress failed", file);
1538                 return -1;
1539         }
1540
1541         /* if testing, or we uncompressed to stdout, this is all we need */
1542 #ifndef SMALL
1543         if (tflag)
1544                 return size;
1545 #endif
1546         /* if we are uncompressing to stdin, don't remove the file. */
1547         if (cflag)
1548                 return size;
1549
1550         /*
1551          * if we create a file...
1552          */
1553         /*
1554          * if we can't stat the file don't remove the file.
1555          */
1556
1557         ofd = open(outfile, O_RDWR, 0);
1558         if (ofd == -1) {
1559                 maybe_warn("couldn't open (leaving original): %s",
1560                            outfile);
1561                 return -1;
1562         }
1563         if (fstat(ofd, &osb) != 0) {
1564                 maybe_warn("couldn't stat (leaving original): %s",
1565                            outfile);
1566                 close(ofd);
1567                 return -1;
1568         }
1569         if (osb.st_size != size) {
1570                 maybe_warnx("stat gave different size: %ju != %ju (leaving original)",
1571                     (uintmax_t)size, (uintmax_t)osb.st_size);
1572                 close(ofd);
1573                 unlink(outfile);
1574                 return -1;
1575         }
1576 #ifndef SMALL
1577         copymodes(ofd, &isb, outfile);
1578         remove_file = NULL;
1579 #endif
1580         close(ofd);
1581         unlink_input(file, &isb);
1582         return size;
1583
1584     unexpected_EOF:
1585         maybe_warnx("%s: unexpected end of file", file);
1586     lose:
1587         if (fd != -1)
1588                 close(fd);
1589         if (zfd != -1 && zfd != STDOUT_FILENO)
1590                 close(fd);
1591         return -1;
1592 }
1593
1594 #ifndef SMALL
1595 static off_t
1596 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd)
1597 {
1598         char buf[BUFLEN];
1599         off_t in_tot;
1600         ssize_t w;
1601
1602         in_tot = count;
1603         w = write(STDOUT_FILENO, prepend, count);
1604         if (w == -1 || (size_t)w != count) {
1605                 maybe_warn("write to stdout");
1606                 return -1;
1607         }
1608         for (;;) {
1609                 ssize_t rv;
1610
1611                 rv = read(fd, buf, sizeof buf);
1612                 if (rv == 0)
1613                         break;
1614                 if (rv < 0) {
1615                         maybe_warn("read from fd %d", fd);
1616                         break;
1617                 }
1618
1619                 if (write(STDOUT_FILENO, buf, rv) != rv) {
1620                         maybe_warn("write to stdout");
1621                         break;
1622                 }
1623                 in_tot += rv;
1624         }
1625
1626         if (gsizep)
1627                 *gsizep = in_tot;
1628         return (in_tot);
1629 }
1630 #endif
1631
1632 static void
1633 handle_stdin(void)
1634 {
1635         unsigned char header1[4];
1636         off_t usize, gsize;
1637         enum filetype method;
1638         ssize_t bytes_read;
1639 #ifndef NO_COMPRESS_SUPPORT
1640         FILE *in;
1641 #endif
1642
1643 #ifndef SMALL
1644         if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
1645                 maybe_warnx("standard input is a terminal -- ignoring");
1646                 return;
1647         }
1648 #endif
1649
1650         if (lflag) {
1651                 struct stat isb;
1652
1653                 /* XXX could read the whole file, etc. */
1654                 if (fstat(STDIN_FILENO, &isb) < 0) {
1655                         maybe_warn("fstat");
1656                         return;
1657                 }
1658                 print_list(STDIN_FILENO, isb.st_size, "stdout", isb.st_mtime);
1659                 return;
1660         }
1661
1662         bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1);
1663         if (bytes_read == -1) {
1664                 maybe_warn("can't read stdin");
1665                 return;
1666         } else if (bytes_read != sizeof(header1)) {
1667                 maybe_warnx("(stdin): unexpected end of file");
1668                 return;
1669         }
1670
1671         method = file_gettype(header1);
1672         switch (method) {
1673         default:
1674 #ifndef SMALL
1675                 if (fflag == 0) {
1676                         maybe_warnx("unknown compression format");
1677                         return;
1678                 }
1679                 usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO);
1680                 break;
1681 #endif
1682         case FT_GZIP:
1683                 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
1684                               (char *)header1, sizeof header1, &gsize, "(stdin)");
1685                 break;
1686 #ifndef NO_BZIP2_SUPPORT
1687         case FT_BZIP2:
1688                 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
1689                                 (char *)header1, sizeof header1, &gsize);
1690                 break;
1691 #endif
1692 #ifndef NO_COMPRESS_SUPPORT
1693         case FT_Z:
1694                 if ((in = zdopen(STDIN_FILENO)) == NULL) {
1695                         maybe_warnx("zopen of stdin");
1696                         return;
1697                 }
1698
1699                 usize = zuncompress(in, stdout, (char *)header1, sizeof header1, &gsize);
1700                 fclose(in);
1701                 break;
1702 #endif
1703 #ifndef NO_PACK_SUPPORT
1704         case FT_PACK:
1705                 usize = unpack(STDIN_FILENO, STDOUT_FILENO,
1706                                (char *)header1, sizeof header1, &gsize);
1707                 break;
1708 #endif
1709         }
1710
1711 #ifndef SMALL
1712         if (vflag && !tflag && usize != -1 && gsize != -1)
1713                 print_verbage(NULL, NULL, usize, gsize);
1714         if (vflag && tflag)
1715                 print_test("(stdin)", usize != -1);
1716 #endif
1717
1718 }
1719
1720 static void
1721 handle_stdout(void)
1722 {
1723         off_t gsize, usize;
1724         struct stat sb;
1725         time_t systime;
1726         uint32_t mtime;
1727         int ret;
1728
1729 #ifndef SMALL
1730         if (fflag == 0 && isatty(STDOUT_FILENO)) {
1731                 maybe_warnx("standard output is a terminal -- ignoring");
1732                 return;
1733         }
1734 #endif
1735         /* If stdin is a file use it's mtime, otherwise use current time */
1736         ret = fstat(STDIN_FILENO, &sb);
1737
1738 #ifndef SMALL
1739         if (ret < 0) {
1740                 maybe_warn("Can't stat stdin");
1741                 return;
1742         }
1743 #endif
1744
1745         if (S_ISREG(sb.st_mode))
1746                 mtime = (uint32_t)sb.st_mtime;
1747         else {
1748                 systime = time(NULL);
1749 #ifndef SMALL
1750                 if (systime == -1) {
1751                         maybe_warn("time");
1752                         return;
1753                 }
1754 #endif
1755                 mtime = (uint32_t)systime;
1756         }
1757
1758         usize = gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime);
1759 #ifndef SMALL
1760         if (vflag && !tflag && usize != -1 && gsize != -1)
1761                 print_verbage(NULL, NULL, usize, gsize);
1762 #endif
1763 }
1764
1765 /* do what is asked for, for the path name */
1766 static void
1767 handle_pathname(char *path)
1768 {
1769         char *opath = path, *s = NULL;
1770         ssize_t len;
1771         int slen;
1772         struct stat sb;
1773
1774         /* check for stdout/stdin */
1775         if (path[0] == '-' && path[1] == '\0') {
1776                 if (dflag)
1777                         handle_stdin();
1778                 else
1779                         handle_stdout();
1780                 return;
1781         }
1782
1783 retry:
1784         if (stat(path, &sb) != 0) {
1785                 /* lets try <path>.gz if we're decompressing */
1786                 if (dflag && s == NULL && errno == ENOENT) {
1787                         len = strlen(path);
1788                         slen = suffixes[0].ziplen;
1789                         s = malloc(len + slen + 1);
1790                         if (s == NULL)
1791                                 maybe_err("malloc");
1792                         memcpy(s, path, len);
1793                         memcpy(s + len, suffixes[0].zipped, slen + 1);
1794                         path = s;
1795                         goto retry;
1796                 }
1797                 maybe_warn("can't stat: %s", opath);
1798                 goto out;
1799         }
1800
1801         if (S_ISDIR(sb.st_mode)) {
1802 #ifndef SMALL
1803                 if (rflag)
1804                         handle_dir(path);
1805                 else
1806 #endif
1807                         maybe_warnx("%s is a directory", path);
1808                 goto out;
1809         }
1810
1811         if (S_ISREG(sb.st_mode))
1812                 handle_file(path, &sb);
1813         else
1814                 maybe_warnx("%s is not a regular file", path);
1815
1816 out:
1817         if (s)
1818                 free(s);
1819 }
1820
1821 /* compress/decompress a file */
1822 static void
1823 handle_file(char *file, struct stat *sbp)
1824 {
1825         off_t usize, gsize;
1826         char    outfile[PATH_MAX];
1827
1828         infile = file;
1829         if (dflag) {
1830                 usize = file_uncompress(file, outfile, sizeof(outfile));
1831 #ifndef SMALL
1832                 if (vflag && tflag)
1833                         print_test(file, usize != -1);
1834 #endif
1835                 if (usize == -1)
1836                         return;
1837                 gsize = sbp->st_size;
1838         } else {
1839                 gsize = file_compress(file, outfile, sizeof(outfile));
1840                 if (gsize == -1)
1841                         return;
1842                 usize = sbp->st_size;
1843         }
1844
1845
1846 #ifndef SMALL
1847         if (vflag && !tflag)
1848                 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
1849 #endif
1850 }
1851
1852 #ifndef SMALL
1853 /* this is used with -r to recursively descend directories */
1854 static void
1855 handle_dir(char *dir)
1856 {
1857         char *path_argv[2];
1858         FTS *fts;
1859         FTSENT *entry;
1860
1861         path_argv[0] = dir;
1862         path_argv[1] = 0;
1863         fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
1864         if (fts == NULL) {
1865                 warn("couldn't fts_open %s", dir);
1866                 return;
1867         }
1868
1869         while ((entry = fts_read(fts))) {
1870                 switch(entry->fts_info) {
1871                 case FTS_D:
1872                 case FTS_DP:
1873                         continue;
1874
1875                 case FTS_DNR:
1876                 case FTS_ERR:
1877                 case FTS_NS:
1878                         maybe_warn("%s", entry->fts_path);
1879                         continue;
1880                 case FTS_F:
1881                         handle_file(entry->fts_path, entry->fts_statp);
1882                 }
1883         }
1884         (void)fts_close(fts);
1885 }
1886 #endif
1887
1888 /* print a ratio - size reduction as a fraction of uncompressed size */
1889 static void
1890 print_ratio(off_t in, off_t out, FILE *where)
1891 {
1892         int percent10;  /* 10 * percent */
1893         off_t diff;
1894         char buff[8];
1895         int len;
1896
1897         diff = in - out/2;
1898         if (diff <= 0)
1899                 /*
1900                  * Output is more than double size of input! print -99.9%
1901                  * Quite possibly we've failed to get the original size.
1902                  */
1903                 percent10 = -999;
1904         else {
1905                 /*
1906                  * We only need 12 bits of result from the final division,
1907                  * so reduce the values until a 32bit division will suffice.
1908                  */
1909                 while (in > 0x100000) {
1910                         diff >>= 1;
1911                         in >>= 1;
1912                 }
1913                 if (in != 0)
1914                         percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
1915                 else
1916                         percent10 = 0;
1917         }
1918
1919         len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
1920         /* Move the '.' to before the last digit */
1921         buff[len - 1] = buff[len - 2];
1922         buff[len - 2] = '.';
1923         fprintf(where, "%5s%%", buff);
1924 }
1925
1926 #ifndef SMALL
1927 /* print compression statistics, and the new name (if there is one!) */
1928 static void
1929 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
1930 {
1931         if (file)
1932                 fprintf(stderr, "%s:%s  ", file,
1933                     strlen(file) < 7 ? "\t\t" : "\t");
1934         print_ratio(usize, gsize, stderr);
1935         if (nfile)
1936                 fprintf(stderr, " -- replaced with %s", nfile);
1937         fprintf(stderr, "\n");
1938         fflush(stderr);
1939 }
1940
1941 /* print test results */
1942 static void
1943 print_test(const char *file, int ok)
1944 {
1945
1946         if (exit_value == 0 && ok == 0)
1947                 exit_value = 1;
1948         fprintf(stderr, "%s:%s  %s\n", file,
1949             strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
1950         fflush(stderr);
1951 }
1952 #endif
1953
1954 /* print a file's info ala --list */
1955 /* eg:
1956   compressed uncompressed  ratio uncompressed_name
1957       354841      1679360  78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
1958 */
1959 static void
1960 print_list(int fd, off_t out, const char *outfile, time_t ts)
1961 {
1962         static int first = 1;
1963 #ifndef SMALL
1964         static off_t in_tot, out_tot;
1965         uint32_t crc = 0;
1966 #endif
1967         off_t in = 0, rv;
1968
1969         if (first) {
1970 #ifndef SMALL
1971                 if (vflag)
1972                         printf("method  crc     date  time  ");
1973 #endif
1974                 if (qflag == 0)
1975                         printf("  compressed uncompressed  "
1976                                "ratio uncompressed_name\n");
1977         }
1978         first = 0;
1979
1980         /* print totals? */
1981 #ifndef SMALL
1982         if (fd == -1) {
1983                 in = in_tot;
1984                 out = out_tot;
1985         } else
1986 #endif
1987         {
1988                 /* read the last 4 bytes - this is the uncompressed size */
1989                 rv = lseek(fd, (off_t)(-8), SEEK_END);
1990                 if (rv != -1) {
1991                         unsigned char buf[8];
1992                         uint32_t usize;
1993
1994                         rv = read(fd, (char *)buf, sizeof(buf));
1995                         if (rv == -1)
1996                                 maybe_warn("read of uncompressed size");
1997                         else if (rv != sizeof(buf))
1998                                 maybe_warnx("read of uncompressed size");
1999
2000                         else {
2001                                 usize = buf[4] | buf[5] << 8 |
2002                                         buf[6] << 16 | buf[7] << 24;
2003                                 in = (off_t)usize;
2004 #ifndef SMALL
2005                                 crc = buf[0] | buf[1] << 8 |
2006                                       buf[2] << 16 | buf[3] << 24;
2007 #endif
2008                         }
2009                 }
2010         }
2011
2012 #ifndef SMALL
2013         if (vflag && fd == -1)
2014                 printf("                            ");
2015         else if (vflag) {
2016                 char *date = ctime(&ts);
2017
2018                 /* skip the day, 1/100th second, and year */
2019                 date += 4;
2020                 date[12] = 0;
2021                 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
2022         }
2023         in_tot += in;
2024         out_tot += out;
2025 #else
2026         (void)&ts;      /* XXX */
2027 #endif
2028         printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
2029         print_ratio(in, out, stdout);
2030         printf(" %s\n", outfile);
2031 }
2032
2033 /* display the usage of NetBSD gzip */
2034 static void
2035 usage(void)
2036 {
2037
2038         fprintf(stderr, "%s\n", gzip_version);
2039         fprintf(stderr,
2040 #ifdef SMALL
2041     "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n",
2042 #else
2043     "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n"
2044     " -1 --fast            fastest (worst) compression\n"
2045     " -2 .. -8             set compression level\n"
2046     " -9 --best            best (slowest) compression\n"
2047     " -c --stdout          write to stdout, keep original files\n"
2048     "    --to-stdout\n"
2049     " -d --decompress      uncompress files\n"
2050     "    --uncompress\n"
2051     " -f --force           force overwriting & compress links\n"
2052     " -h --help            display this help\n"
2053     " -k --keep            don't delete input files during operation\n"
2054     " -l --list            list compressed file contents\n"
2055     " -N --name            save or restore original file name and time stamp\n"
2056     " -n --no-name         don't save original file name or time stamp\n"
2057     " -q --quiet           output no warnings\n"
2058     " -r --recursive       recursively compress files in directories\n"
2059     " -S .suf              use suffix .suf instead of .gz\n"
2060     "    --suffix .suf\n"
2061     " -t --test            test compressed file\n"
2062     " -V --version         display program version\n"
2063     " -v --verbose         print extra statistics\n",
2064 #endif
2065             getprogname());
2066         exit(0);
2067 }
2068
2069 #ifndef SMALL
2070 /* display the license information of FreeBSD gzip */
2071 static void
2072 display_license(void)
2073 {
2074
2075         fprintf(stderr, "%s (based on NetBSD gzip 20091011)\n", gzip_version);
2076         fprintf(stderr, "%s\n", gzip_copyright);
2077         exit(0);
2078 }
2079 #endif
2080
2081 /* display the version of NetBSD gzip */
2082 static void
2083 display_version(void)
2084 {
2085
2086         fprintf(stderr, "%s\n", gzip_version);
2087         exit(0);
2088 }
2089
2090 #ifndef NO_BZIP2_SUPPORT
2091 #include "unbzip2.c"
2092 #endif
2093 #ifndef NO_COMPRESS_SUPPORT
2094 #include "zuncompress.c"
2095 #endif
2096 #ifndef NO_PACK_SUPPORT
2097 #include "unpack.c"
2098 #endif
2099
2100 static ssize_t
2101 read_retry(int fd, void *buf, size_t sz)
2102 {
2103         char *cp = buf;
2104         size_t left = MIN(sz, (size_t) SSIZE_MAX);
2105
2106         while (left > 0) {
2107                 ssize_t ret;
2108
2109                 ret = read(fd, cp, left);
2110                 if (ret == -1) {
2111                         return ret;
2112                 } else if (ret == 0) {
2113                         break; /* EOF */
2114                 }
2115                 cp += ret;
2116                 left -= ret;
2117         }
2118
2119         return sz - left;
2120 }