usr.bin/gzip/gzip.c

   1 /*      $NetBSD: gzip.c,v 1.99 2011/03/23 12:59:44 tsutsui 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 __FBSDID("$FreeBSD$");
  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 20110523";
 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 "123456789cdhlV"
 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
 922                         case Z_STREAM_END:
 923                         case Z_OK:
 924                                 break;
 925
 926                         case Z_NEED_DICT:
 927                                 maybe_warnx("Z_NEED_DICT error");
 928                                 goto stop_and_fail;
 929                         case Z_DATA_ERROR:
 930                                 maybe_warnx("data stream error");
 931                                 goto stop_and_fail;
 932                         case Z_STREAM_ERROR:
 933                                 maybe_warnx("internal stream error");
 934                                 goto stop_and_fail;
 935                         case Z_MEM_ERROR:
 936                                 maybe_warnx("memory allocation error");
 937                                 goto stop_and_fail;
 938
 939                         default:
 940                                 maybe_warn("unknown error from inflate(): %d",
 941                                     error);
 942                         }
 943                         wr = BUFLEN - z.avail_out;
 944
 945                         if (wr != 0) {
 946                                 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr);
 947                                 if (
 948 #ifndef SMALL
 949                                     /* don't write anything with -t */
 950                                     tflag == 0 &&
 951 #endif
 952                                     write(out, outbufp, wr) != wr) {
 953                                         maybe_warn("error writing to output");
 954                                         goto stop_and_fail;
 955                                 }
 956
 957                                 out_tot += wr;
 958                                 out_sub_tot += wr;
 959                         }
 960
 961                         if (error == Z_STREAM_END) {
 962                                 inflateEnd(&z);
 963                                 state++;
 964                         }
 965
 966                         z.next_out = (unsigned char *)outbufp;
 967                         z.avail_out = BUFLEN;
 968
 969                         break;
 970                 case GZSTATE_CRC:
 971                         {
 972                                 uLong origcrc;
 973
 974                                 if (z.avail_in < 4) {
 975                                         if (!done_reading) {
 976                                                 needmore = 1;
 977                                                 continue;
 978                                         }
 979                                         maybe_warnx("truncated input");
 980                                         goto stop_and_fail;
 981                                 }
 982                                 origcrc = ((unsigned)z.next_in[0] & 0xff) |
 983                                         ((unsigned)z.next_in[1] & 0xff) << 8 |
 984                                         ((unsigned)z.next_in[2] & 0xff) << 16 |
 985                                         ((unsigned)z.next_in[3] & 0xff) << 24;
 986                                 if (origcrc != crc) {
 987                                         maybe_warnx("invalid compressed"
 988                                              " data--crc error");
 989                                         goto stop_and_fail;
 990                                 }
 991                         }
 992
 993                         z.avail_in -= 4;
 994                         z.next_in += 4;
 995
 996                         if (!z.avail_in && done_reading) {
 997                                 goto stop;
 998                         }
 999                         state++;
1000                         break;
1001                 case GZSTATE_LEN:
1002                         {
1003                                 uLong origlen;
1004
1005                                 if (z.avail_in < 4) {
1006                                         if (!done_reading) {
1007                                                 needmore = 1;
1008                                                 continue;
1009                                         }
1010                                         maybe_warnx("truncated input");
1011                                         goto stop_and_fail;
1012                                 }
1013                                 origlen = ((unsigned)z.next_in[0] & 0xff) |
1014                                         ((unsigned)z.next_in[1] & 0xff) << 8 |
1015                                         ((unsigned)z.next_in[2] & 0xff) << 16 |
1016                                         ((unsigned)z.next_in[3] & 0xff) << 24;
1017
1018                                 if (origlen != out_sub_tot) {
1019                                         maybe_warnx("invalid compressed"
1020                                              " data--length error");
1021                                         goto stop_and_fail;
1022                                 }
1023                         }
1024
1025                         z.avail_in -= 4;
1026                         z.next_in += 4;
1027
1028                         if (error < 0) {
1029                                 maybe_warnx("decompression error");
1030                                 goto stop_and_fail;
1031                         }
1032                         state = GZSTATE_MAGIC0;
1033                         break;
1034                 }
1035                 continue;
1036 stop_and_fail:
1037                 out_tot = -1;
1038 stop:
1039                 break;
1040         }
1041         if (state > GZSTATE_INIT)
1042                 inflateEnd(&z);
1043
1044         free(inbufp);
1045 out1:
1046         free(outbufp);
1047 out2:
1048         if (gsizep)
1049                 *gsizep = in_tot;
1050         return (out_tot);
1051 }
1052
1053 #ifndef SMALL
1054 /*
1055  * set the owner, mode, flags & utimes using the given file descriptor.
1056  * file is only used in possible warning messages.
1057  */
1058 static void
1059 copymodes(int fd, const struct stat *sbp, const char *file)
1060 {
1061         struct timeval times[2];
1062         struct stat sb;
1063
1064         /*
1065          * If we have no info on the input, give this file some
1066          * default values and return..
1067          */
1068         if (sbp == NULL) {
1069                 mode_t mask = umask(022);
1070
1071                 (void)fchmod(fd, DEFFILEMODE & ~mask);
1072                 (void)umask(mask);
1073                 return;
1074         }
1075         sb = *sbp;
1076
1077         /* if the chown fails, remove set-id bits as-per compress(1) */
1078         if (fchown(fd, sb.st_uid, sb.st_gid) < 0) {
1079                 if (errno != EPERM)
1080                         maybe_warn("couldn't fchown: %s", file);
1081                 sb.st_mode &= ~(S_ISUID|S_ISGID);
1082         }
1083
1084         /* we only allow set-id and the 9 normal permission bits */
1085         sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
1086         if (fchmod(fd, sb.st_mode) < 0)
1087                 maybe_warn("couldn't fchmod: %s", file);
1088
1089         TIMESPEC_TO_TIMEVAL(&times[0], &sb.st_atim);
1090         TIMESPEC_TO_TIMEVAL(&times[1], &sb.st_mtim);
1091         if (futimes(fd, times) < 0)
1092                 maybe_warn("couldn't utimes: %s", file);
1093
1094         /* only try flags if they exist already */
1095         if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0)
1096                 maybe_warn("couldn't fchflags: %s", file);
1097 }
1098 #endif
1099
1100 /* what sort of file is this? */
1101 static enum filetype
1102 file_gettype(u_char *buf)
1103 {
1104
1105         if (buf[0] == GZIP_MAGIC0 &&
1106             (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
1107                 return FT_GZIP;
1108         else
1109 #ifndef NO_BZIP2_SUPPORT
1110         if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
1111             buf[3] >= '0' && buf[3] <= '9')
1112                 return FT_BZIP2;
1113         else
1114 #endif
1115 #ifndef NO_COMPRESS_SUPPORT
1116         if (memcmp(buf, Z_MAGIC, 2) == 0)
1117                 return FT_Z;
1118         else
1119 #endif
1120 #ifndef NO_PACK_SUPPORT
1121         if (memcmp(buf, PACK_MAGIC, 2) == 0)
1122                 return FT_PACK;
1123         else
1124 #endif
1125                 return FT_UNKNOWN;
1126 }
1127
1128 #ifndef SMALL
1129 /* check the outfile is OK. */
1130 static int
1131 check_outfile(const char *outfile)
1132 {
1133         struct stat sb;
1134         int ok = 1;
1135
1136         if (lflag == 0 && stat(outfile, &sb) == 0) {
1137                 if (fflag)
1138                         unlink(outfile);
1139                 else if (isatty(STDIN_FILENO)) {
1140                         char ans[10] = { 'n', '\0' };   /* default */
1141
1142                         fprintf(stderr, "%s already exists -- do you wish to "
1143                                         "overwrite (y or n)? " , outfile);
1144                         (void)fgets(ans, sizeof(ans) - 1, stdin);
1145                         if (ans[0] != 'y' && ans[0] != 'Y') {
1146                                 fprintf(stderr, "\tnot overwriting\n");
1147                                 ok = 0;
1148                         } else
1149                                 unlink(outfile);
1150                 } else {
1151                         maybe_warnx("%s already exists -- skipping", outfile);
1152                         ok = 0;
1153                 }
1154         }
1155         return ok;
1156 }
1157
1158 static void
1159 unlink_input(const char *file, const struct stat *sb)
1160 {
1161         struct stat nsb;
1162
1163         if (kflag)
1164                 return;
1165         if (stat(file, &nsb) != 0)
1166                 /* Must be gone already */
1167                 return;
1168         if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
1169                 /* Definitely a different file */
1170                 return;
1171         unlink(file);
1172 }
1173
1174 static void
1175 sigint_handler(int signo __unused)
1176 {
1177
1178         if (remove_file != NULL)
1179                 unlink(remove_file);
1180         _exit(2);
1181 }
1182 #endif
1183
1184 static const suffixes_t *
1185 check_suffix(char *file, int xlate)
1186 {
1187         const suffixes_t *s;
1188         int len = strlen(file);
1189         char *sp;
1190
1191         for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
1192                 /* if it doesn't fit in "a.suf", don't bother */
1193                 if (s->ziplen >= len)
1194                         continue;
1195                 sp = file + len - s->ziplen;
1196                 if (strcmp(s->zipped, sp) != 0)
1197                         continue;
1198                 if (xlate)
1199                         strcpy(sp, s->normal);
1200                 return s;
1201         }
1202         return NULL;
1203 }
1204
1205 /*
1206  * compress the given file: create a corresponding .gz file and remove the
1207  * original.
1208  */
1209 static off_t
1210 file_compress(char *file, char *outfile, size_t outsize)
1211 {
1212         int in;
1213         int out;
1214         off_t size, insize;
1215 #ifndef SMALL
1216         struct stat isb, osb;
1217         const suffixes_t *suff;
1218 #endif
1219
1220         in = open(file, O_RDONLY);
1221         if (in == -1) {
1222                 maybe_warn("can't open %s", file);
1223                 return (-1);
1224         }
1225
1226 #ifndef SMALL
1227         if (fstat(in, &isb) != 0) {
1228                 maybe_warn("couldn't stat: %s", file);
1229                 close(in);
1230                 return (-1);
1231         }
1232 #endif
1233
1234         if (cflag == 0) {
1235 #ifndef SMALL
1236                 if (isb.st_nlink > 1 && fflag == 0) {
1237                         maybe_warnx("%s has %d other link%s -- skipping",
1238                             file, isb.st_nlink - 1,
1239                             (isb.st_nlink - 1) == 1 ? "" : "s");
1240                         close(in);
1241                         return (-1);
1242                 }
1243
1244                 if (fflag == 0 && (suff = check_suffix(file, 0)) &&
1245                     suff->zipped[0] != 0) {
1246                         maybe_warnx("%s already has %s suffix -- unchanged",
1247                             file, suff->zipped);
1248                         close(in);
1249                         return (-1);
1250                 }
1251 #endif
1252
1253                 /* Add (usually) .gz to filename */
1254                 if ((size_t)snprintf(outfile, outsize, "%s%s",
1255                     file, suffixes[0].zipped) >= outsize)
1256                         memcpy(outfile + outsize - suffixes[0].ziplen - 1,
1257                             suffixes[0].zipped, suffixes[0].ziplen + 1);
1258
1259 #ifndef SMALL
1260                 if (check_outfile(outfile) == 0) {
1261                         close(in);
1262                         return (-1);
1263                 }
1264 #endif
1265         }
1266
1267         if (cflag == 0) {
1268                 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
1269                 if (out == -1) {
1270                         maybe_warn("could not create output: %s", outfile);
1271                         fclose(stdin);
1272                         return (-1);
1273                 }
1274 #ifndef SMALL
1275                 remove_file = outfile;
1276 #endif
1277         } else
1278                 out = STDOUT_FILENO;
1279
1280         insize = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
1281
1282         (void)close(in);
1283
1284         /*
1285          * If there was an error, insize will be -1.
1286          * If we compressed to stdout, just return the size.
1287          * Otherwise stat the file and check it is the correct size.
1288          * We only blow away the file if we can stat the output and it
1289          * has the expected size.
1290          */
1291         if (cflag != 0)
1292                 return (insize == -1 ? -1 : size);
1293
1294 #ifndef SMALL
1295         if (fstat(out, &osb) != 0) {
1296                 maybe_warn("couldn't stat: %s", outfile);
1297                 goto bad_outfile;
1298         }
1299
1300         if (osb.st_size != size) {
1301                 maybe_warnx("output file: %s wrong size (%ju != %ju), deleting",
1302                     outfile, (uintmax_t)osb.st_size, (uintmax_t)size);
1303                 goto bad_outfile;
1304         }
1305
1306         copymodes(out, &isb, outfile);
1307         remove_file = NULL;
1308 #endif
1309         if (close(out) == -1)
1310                 maybe_warn("couldn't close output");
1311
1312         /* output is good, ok to delete input */
1313         unlink_input(file, &isb);
1314         return (size);
1315
1316 #ifndef SMALL
1317     bad_outfile:
1318         if (close(out) == -1)
1319                 maybe_warn("couldn't close output");
1320
1321         maybe_warnx("leaving original %s", file);
1322         unlink(outfile);
1323         return (size);
1324 #endif
1325 }
1326
1327 /* uncompress the given file and remove the original */
1328 static off_t
1329 file_uncompress(char *file, char *outfile, size_t outsize)
1330 {
1331         struct stat isb, osb;
1332         off_t size;
1333         ssize_t rbytes;
1334         unsigned char header1[4];
1335         enum filetype method;
1336         int fd, ofd, zfd = -1;
1337 #ifndef SMALL
1338         ssize_t rv;
1339         time_t timestamp = 0;
1340         unsigned char name[PATH_MAX + 1];
1341 #endif
1342
1343         /* gather the old name info */
1344
1345         fd = open(file, O_RDONLY);
1346         if (fd < 0) {
1347                 maybe_warn("can't open %s", file);
1348                 goto lose;
1349         }
1350
1351         strlcpy(outfile, file, outsize);
1352         if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
1353                 maybe_warnx("%s: unknown suffix -- ignored", file);
1354                 goto lose;
1355         }
1356
1357         rbytes = read(fd, header1, sizeof header1);
1358         if (rbytes != sizeof header1) {
1359                 /* we don't want to fail here. */
1360 #ifndef SMALL
1361                 if (fflag)
1362                         goto lose;
1363 #endif
1364                 if (rbytes == -1)
1365                         maybe_warn("can't read %s", file);
1366                 else
1367                         goto unexpected_EOF;
1368                 goto lose;
1369         }
1370
1371         method = file_gettype(header1);
1372
1373 #ifndef SMALL
1374         if (fflag == 0 && method == FT_UNKNOWN) {
1375                 maybe_warnx("%s: not in gzip format", file);
1376                 goto lose;
1377         }
1378
1379 #endif
1380
1381 #ifndef SMALL
1382         if (method == FT_GZIP && Nflag) {
1383                 unsigned char ts[4];    /* timestamp */
1384
1385                 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP);
1386                 if (rv >= 0 && rv < (ssize_t)(sizeof ts))
1387                         goto unexpected_EOF;
1388                 if (rv == -1) {
1389                         if (!fflag)
1390                                 maybe_warn("can't read %s", file);
1391                         goto lose;
1392                 }
1393                 timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0];
1394
1395                 if (header1[3] & ORIG_NAME) {
1396                         rbytes = pread(fd, name, sizeof name, GZIP_ORIGNAME);
1397                         if (rbytes < 0) {
1398                                 maybe_warn("can't read %s", file);
1399                                 goto lose;
1400                         }
1401                         if (name[0] != 0) {
1402                                 /* preserve original directory name */
1403                                 char *dp = strrchr(file, '/');
1404                                 if (dp == NULL)
1405                                         dp = file;
1406                                 else
1407                                         dp++;
1408                                 snprintf(outfile, outsize, "%.*s%.*s",
1409                                                 (int) (dp - file),
1410                                                 file, (int) rbytes, name);
1411                         }
1412                 }
1413         }
1414 #endif
1415         lseek(fd, 0, SEEK_SET);
1416
1417         if (cflag == 0 || lflag) {
1418                 if (fstat(fd, &isb) != 0)
1419                         goto lose;
1420 #ifndef SMALL
1421                 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
1422                         maybe_warnx("%s has %d other links -- skipping",
1423                             file, isb.st_nlink - 1);
1424                         goto lose;
1425                 }
1426                 if (nflag == 0 && timestamp)
1427                         isb.st_mtime = timestamp;
1428                 if (check_outfile(outfile) == 0)
1429                         goto lose;
1430 #endif
1431         }
1432
1433         if (cflag == 0 && lflag == 0) {
1434                 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
1435                 if (zfd == STDOUT_FILENO) {
1436                         /* We won't close STDOUT_FILENO later... */
1437                         zfd = dup(zfd);
1438                         close(STDOUT_FILENO);
1439                 }
1440                 if (zfd == -1) {
1441                         maybe_warn("can't open %s", outfile);
1442                         goto lose;
1443                 }
1444 #ifndef SMALL
1445                 remove_file = outfile;
1446 #endif
1447         } else
1448                 zfd = STDOUT_FILENO;
1449
1450 #ifndef NO_BZIP2_SUPPORT
1451         if (method == FT_BZIP2) {
1452
1453                 /* XXX */
1454                 if (lflag) {
1455                         maybe_warnx("no -l with bzip2 files");
1456                         goto lose;
1457                 }
1458
1459                 size = unbzip2(fd, zfd, NULL, 0, NULL);
1460         } else
1461 #endif
1462
1463 #ifndef NO_COMPRESS_SUPPORT
1464         if (method == FT_Z) {
1465                 FILE *in, *out;
1466
1467                 /* XXX */
1468                 if (lflag) {
1469                         maybe_warnx("no -l with Lempel-Ziv files");
1470                         goto lose;
1471                 }
1472
1473                 if ((in = zdopen(fd)) == NULL) {
1474                         maybe_warn("zdopen for read: %s", file);
1475                         goto lose;
1476                 }
1477
1478                 out = fdopen(dup(zfd), "w");
1479                 if (out == NULL) {
1480                         maybe_warn("fdopen for write: %s", outfile);
1481                         fclose(in);
1482                         goto lose;
1483                 }
1484
1485                 size = zuncompress(in, out, NULL, 0, NULL);
1486                 /* need to fclose() if ferror() is true... */
1487                 if (ferror(in) | fclose(in)) {
1488                         maybe_warn("failed infile fclose");
1489                         unlink(outfile);
1490                         (void)fclose(out);
1491                 }
1492                 if (fclose(out) != 0) {
1493                         maybe_warn("failed outfile fclose");
1494                         unlink(outfile);
1495                         goto lose;
1496                 }
1497         } else
1498 #endif
1499
1500 #ifndef NO_PACK_SUPPORT
1501         if (method == FT_PACK) {
1502                 if (lflag) {
1503                         maybe_warnx("no -l with packed files");
1504                         goto lose;
1505                 }
1506
1507                 size = unpack(fd, zfd, NULL, 0, NULL);
1508         } else
1509 #endif
1510
1511 #ifndef SMALL
1512         if (method == FT_UNKNOWN) {
1513                 if (lflag) {
1514                         maybe_warnx("no -l for unknown filetypes");
1515                         goto lose;
1516                 }
1517                 size = cat_fd(NULL, 0, NULL, fd);
1518         } else
1519 #endif
1520         {
1521                 if (lflag) {
1522                         print_list(fd, isb.st_size, outfile, isb.st_mtime);
1523                         close(fd);
1524                         return -1;      /* XXX */
1525                 }
1526
1527                 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
1528         }
1529
1530         if (close(fd) != 0)
1531                 maybe_warn("couldn't close input");
1532         if (zfd != STDOUT_FILENO && close(zfd) != 0)
1533                 maybe_warn("couldn't close output");
1534
1535         if (size == -1) {
1536                 if (cflag == 0)
1537                         unlink(outfile);
1538                 maybe_warnx("%s: uncompress failed", file);
1539                 return -1;
1540         }
1541
1542         /* if testing, or we uncompressed to stdout, this is all we need */
1543 #ifndef SMALL
1544         if (tflag)
1545                 return size;
1546 #endif
1547         /* if we are uncompressing to stdin, don't remove the file. */
1548         if (cflag)
1549                 return size;
1550
1551         /*
1552          * if we create a file...
1553          */
1554         /*
1555          * if we can't stat the file don't remove the file.
1556          */
1557
1558         ofd = open(outfile, O_RDWR, 0);
1559         if (ofd == -1) {
1560                 maybe_warn("couldn't open (leaving original): %s",
1561                            outfile);
1562                 return -1;
1563         }
1564         if (fstat(ofd, &osb) != 0) {
1565                 maybe_warn("couldn't stat (leaving original): %s",
1566                            outfile);
1567                 close(ofd);
1568                 return -1;
1569         }
1570         if (osb.st_size != size) {
1571                 maybe_warnx("stat gave different size: %ju != %ju (leaving original)",
1572                     (uintmax_t)size, (uintmax_t)osb.st_size);
1573                 close(ofd);
1574                 unlink(outfile);
1575                 return -1;
1576         }
1577 #ifndef SMALL
1578         copymodes(ofd, &isb, outfile);
1579         remove_file = NULL;
1580 #endif
1581         close(ofd);
1582         unlink_input(file, &isb);
1583         return size;
1584
1585     unexpected_EOF:
1586         maybe_warnx("%s: unexpected end of file", file);
1587     lose:
1588         if (fd != -1)
1589                 close(fd);
1590         if (zfd != -1 && zfd != STDOUT_FILENO)
1591                 close(fd);
1592         return -1;
1593 }
1594
1595 #ifndef SMALL
1596 static off_t
1597 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd)
1598 {
1599         char buf[BUFLEN];
1600         off_t in_tot;
1601         ssize_t w;
1602
1603         in_tot = count;
1604         w = write(STDOUT_FILENO, prepend, count);
1605         if (w == -1 || (size_t)w != count) {
1606                 maybe_warn("write to stdout");
1607                 return -1;
1608         }
1609         for (;;) {
1610                 ssize_t rv;
1611
1612                 rv = read(fd, buf, sizeof buf);
1613                 if (rv == 0)
1614                         break;
1615                 if (rv < 0) {
1616                         maybe_warn("read from fd %d", fd);
1617                         break;
1618                 }
1619
1620                 if (write(STDOUT_FILENO, buf, rv) != rv) {
1621                         maybe_warn("write to stdout");
1622                         break;
1623                 }
1624                 in_tot += rv;
1625         }
1626
1627         if (gsizep)
1628                 *gsizep = in_tot;
1629         return (in_tot);
1630 }
1631 #endif
1632
1633 static void
1634 handle_stdin(void)
1635 {
1636         unsigned char header1[4];
1637         off_t usize, gsize;
1638         enum filetype method;
1639         ssize_t bytes_read;
1640 #ifndef NO_COMPRESS_SUPPORT
1641         FILE *in;
1642 #endif
1643
1644 #ifndef SMALL
1645         if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
1646                 maybe_warnx("standard input is a terminal -- ignoring");
1647                 return;
1648         }
1649 #endif
1650
1651         if (lflag) {
1652                 struct stat isb;
1653
1654                 /* XXX could read the whole file, etc. */
1655                 if (fstat(STDIN_FILENO, &isb) < 0) {
1656                         maybe_warn("fstat");
1657                         return;
1658                 }
1659                 print_list(STDIN_FILENO, isb.st_size, "stdout", isb.st_mtime);
1660                 return;
1661         }
1662
1663         bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1);
1664         if (bytes_read == -1) {
1665                 maybe_warn("can't read stdin");
1666                 return;
1667         } else if (bytes_read != sizeof(header1)) {
1668                 maybe_warnx("(stdin): unexpected end of file");
1669                 return;
1670         }
1671
1672         method = file_gettype(header1);
1673         switch (method) {
1674         default:
1675 #ifndef SMALL
1676                 if (fflag == 0) {
1677                         maybe_warnx("unknown compression format");
1678                         return;
1679                 }
1680                 usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO);
1681                 break;
1682 #endif
1683         case FT_GZIP:
1684                 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
1685                               (char *)header1, sizeof header1, &gsize, "(stdin)");
1686                 break;
1687 #ifndef NO_BZIP2_SUPPORT
1688         case FT_BZIP2:
1689                 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
1690                                 (char *)header1, sizeof header1, &gsize);
1691                 break;
1692 #endif
1693 #ifndef NO_COMPRESS_SUPPORT
1694         case FT_Z:
1695                 if ((in = zdopen(STDIN_FILENO)) == NULL) {
1696                         maybe_warnx("zopen of stdin");
1697                         return;
1698                 }
1699
1700                 usize = zuncompress(in, stdout, (char *)header1, sizeof header1, &gsize);
1701                 fclose(in);
1702                 break;
1703 #endif
1704 #ifndef NO_PACK_SUPPORT
1705         case FT_PACK:
1706                 usize = unpack(STDIN_FILENO, STDOUT_FILENO,
1707                                (char *)header1, sizeof header1, &gsize);
1708                 break;
1709 #endif
1710         }
1711
1712 #ifndef SMALL
1713         if (vflag && !tflag && usize != -1 && gsize != -1)
1714                 print_verbage(NULL, NULL, usize, gsize);
1715         if (vflag && tflag)
1716                 print_test("(stdin)", usize != -1);
1717 #endif
1718
1719 }
1720
1721 static void
1722 handle_stdout(void)
1723 {
1724         off_t gsize, usize;
1725         struct stat sb;
1726         time_t systime;
1727         uint32_t mtime;
1728         int ret;
1729
1730 #ifndef SMALL
1731         if (fflag == 0 && isatty(STDOUT_FILENO)) {
1732                 maybe_warnx("standard output is a terminal -- ignoring");
1733                 return;
1734         }
1735 #endif
1736         /* If stdin is a file use it's mtime, otherwise use current time */
1737         ret = fstat(STDIN_FILENO, &sb);
1738
1739 #ifndef SMALL
1740         if (ret < 0) {
1741                 maybe_warn("Can't stat stdin");
1742                 return;
1743         }
1744 #endif
1745
1746         if (S_ISREG(sb.st_mode))
1747                 mtime = (uint32_t)sb.st_mtime;
1748         else {
1749                 systime = time(NULL);
1750 #ifndef SMALL
1751                 if (systime == -1) {
1752                         maybe_warn("time");
1753                         return;
1754                 }
1755 #endif
1756                 mtime = (uint32_t)systime;
1757         }
1758
1759         usize = gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime);
1760 #ifndef SMALL
1761         if (vflag && !tflag && usize != -1 && gsize != -1)
1762                 print_verbage(NULL, NULL, usize, gsize);
1763 #endif
1764 }
1765
1766 /* do what is asked for, for the path name */
1767 static void
1768 handle_pathname(char *path)
1769 {
1770         char *opath = path, *s = NULL;
1771         ssize_t len;
1772         int slen;
1773         struct stat sb;
1774
1775         /* check for stdout/stdin */
1776         if (path[0] == '-' && path[1] == '\0') {
1777                 if (dflag)
1778                         handle_stdin();
1779                 else
1780                         handle_stdout();
1781                 return;
1782         }
1783
1784 retry:
1785         if (stat(path, &sb) != 0 || (fflag == 0 && cflag == 0 &&
1786             lstat(path, &sb) != 0)) {
1787                 /* lets try <path>.gz if we're decompressing */
1788                 if (dflag && s == NULL && errno == ENOENT) {
1789                         len = strlen(path);
1790                         slen = suffixes[0].ziplen;
1791                         s = malloc(len + slen + 1);
1792                         if (s == NULL)
1793                                 maybe_err("malloc");
1794                         memcpy(s, path, len);
1795                         memcpy(s + len, suffixes[0].zipped, slen + 1);
1796                         path = s;
1797                         goto retry;
1798                 }
1799                 maybe_warn("can't stat: %s", opath);
1800                 goto out;
1801         }
1802
1803         if (S_ISDIR(sb.st_mode)) {
1804 #ifndef SMALL
1805                 if (rflag)
1806                         handle_dir(path);
1807                 else
1808 #endif
1809                         maybe_warnx("%s is a directory", path);
1810                 goto out;
1811         }
1812
1813         if (S_ISREG(sb.st_mode))
1814                 handle_file(path, &sb);
1815         else
1816                 maybe_warnx("%s is not a regular file", path);
1817
1818 out:
1819         if (s)
1820                 free(s);
1821 }
1822
1823 /* compress/decompress a file */
1824 static void
1825 handle_file(char *file, struct stat *sbp)
1826 {
1827         off_t usize, gsize;
1828         char    outfile[PATH_MAX];
1829
1830         infile = file;
1831         if (dflag) {
1832                 usize = file_uncompress(file, outfile, sizeof(outfile));
1833 #ifndef SMALL
1834                 if (vflag && tflag)
1835                         print_test(file, usize != -1);
1836 #endif
1837                 if (usize == -1)
1838                         return;
1839                 gsize = sbp->st_size;
1840         } else {
1841                 gsize = file_compress(file, outfile, sizeof(outfile));
1842                 if (gsize == -1)
1843                         return;
1844                 usize = sbp->st_size;
1845         }
1846
1847
1848 #ifndef SMALL
1849         if (vflag && !tflag)
1850                 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
1851 #endif
1852 }
1853
1854 #ifndef SMALL
1855 /* this is used with -r to recursively descend directories */
1856 static void
1857 handle_dir(char *dir)
1858 {
1859         char *path_argv[2];
1860         FTS *fts;
1861         FTSENT *entry;
1862
1863         path_argv[0] = dir;
1864         path_argv[1] = 0;
1865         fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
1866         if (fts == NULL) {
1867                 warn("couldn't fts_open %s", dir);
1868                 return;
1869         }
1870
1871         while ((entry = fts_read(fts))) {
1872                 switch(entry->fts_info) {
1873                 case FTS_D:
1874                 case FTS_DP:
1875                         continue;
1876
1877                 case FTS_DNR:
1878                 case FTS_ERR:
1879                 case FTS_NS:
1880                         maybe_warn("%s", entry->fts_path);
1881                         continue;
1882                 case FTS_F:
1883                         handle_file(entry->fts_path, entry->fts_statp);
1884                 }
1885         }
1886         (void)fts_close(fts);
1887 }
1888 #endif
1889
1890 /* print a ratio - size reduction as a fraction of uncompressed size */
1891 static void
1892 print_ratio(off_t in, off_t out, FILE *where)
1893 {
1894         int percent10;  /* 10 * percent */
1895         off_t diff;
1896         char buff[8];
1897         int len;
1898
1899         diff = in - out/2;
1900         if (diff <= 0)
1901                 /*
1902                  * Output is more than double size of input! print -99.9%
1903                  * Quite possibly we've failed to get the original size.
1904                  */
1905                 percent10 = -999;
1906         else {
1907                 /*
1908                  * We only need 12 bits of result from the final division,
1909                  * so reduce the values until a 32bit division will suffice.
1910                  */
1911                 while (in > 0x100000) {
1912                         diff >>= 1;
1913                         in >>= 1;
1914                 }
1915                 if (in != 0)
1916                         percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
1917                 else
1918                         percent10 = 0;
1919         }
1920
1921         len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
1922         /* Move the '.' to before the last digit */
1923         buff[len - 1] = buff[len - 2];
1924         buff[len - 2] = '.';
1925         fprintf(where, "%5s%%", buff);
1926 }
1927
1928 #ifndef SMALL
1929 /* print compression statistics, and the new name (if there is one!) */
1930 static void
1931 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
1932 {
1933         if (file)
1934                 fprintf(stderr, "%s:%s  ", file,
1935                     strlen(file) < 7 ? "\t\t" : "\t");
1936         print_ratio(usize, gsize, stderr);
1937         if (nfile)
1938                 fprintf(stderr, " -- replaced with %s", nfile);
1939         fprintf(stderr, "\n");
1940         fflush(stderr);
1941 }
1942
1943 /* print test results */
1944 static void
1945 print_test(const char *file, int ok)
1946 {
1947
1948         if (exit_value == 0 && ok == 0)
1949                 exit_value = 1;
1950         fprintf(stderr, "%s:%s  %s\n", file,
1951             strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
1952         fflush(stderr);
1953 }
1954 #endif
1955
1956 /* print a file's info ala --list */
1957 /* eg:
1958   compressed uncompressed  ratio uncompressed_name
1959       354841      1679360  78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
1960 */
1961 static void
1962 print_list(int fd, off_t out, const char *outfile, time_t ts)
1963 {
1964         static int first = 1;
1965 #ifndef SMALL
1966         static off_t in_tot, out_tot;
1967         uint32_t crc = 0;
1968 #endif
1969         off_t in = 0, rv;
1970
1971         if (first) {
1972 #ifndef SMALL
1973                 if (vflag)
1974                         printf("method  crc     date  time  ");
1975 #endif
1976                 if (qflag == 0)
1977                         printf("  compressed uncompressed  "
1978                                "ratio uncompressed_name\n");
1979         }
1980         first = 0;
1981
1982         /* print totals? */
1983 #ifndef SMALL
1984         if (fd == -1) {
1985                 in = in_tot;
1986                 out = out_tot;
1987         } else
1988 #endif
1989         {
1990                 /* read the last 4 bytes - this is the uncompressed size */
1991                 rv = lseek(fd, (off_t)(-8), SEEK_END);
1992                 if (rv != -1) {
1993                         unsigned char buf[8];
1994                         uint32_t usize;
1995
1996                         rv = read(fd, (char *)buf, sizeof(buf));
1997                         if (rv == -1)
1998                                 maybe_warn("read of uncompressed size");
1999                         else if (rv != sizeof(buf))
2000                                 maybe_warnx("read of uncompressed size");
2001
2002                         else {
2003                                 usize = buf[4] | buf[5] << 8 |
2004                                         buf[6] << 16 | buf[7] << 24;
2005                                 in = (off_t)usize;
2006 #ifndef SMALL
2007                                 crc = buf[0] | buf[1] << 8 |
2008                                       buf[2] << 16 | buf[3] << 24;
2009 #endif
2010                         }
2011                 }
2012         }
2013
2014 #ifndef SMALL
2015         if (vflag && fd == -1)
2016                 printf("                            ");
2017         else if (vflag) {
2018                 char *date = ctime(&ts);
2019
2020                 /* skip the day, 1/100th second, and year */
2021                 date += 4;
2022                 date[12] = 0;
2023                 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
2024         }
2025         in_tot += in;
2026         out_tot += out;
2027 #else
2028         (void)&ts;      /* XXX */
2029 #endif
2030         printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
2031         print_ratio(in, out, stdout);
2032         printf(" %s\n", outfile);
2033 }
2034
2035 /* display the usage of NetBSD gzip */
2036 static void
2037 usage(void)
2038 {
2039
2040         fprintf(stderr, "%s\n", gzip_version);
2041         fprintf(stderr,
2042 #ifdef SMALL
2043     "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n",
2044 #else
2045     "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n"
2046     " -1 --fast            fastest (worst) compression\n"
2047     " -2 .. -8             set compression level\n"
2048     " -9 --best            best (slowest) compression\n"
2049     " -c --stdout          write to stdout, keep original files\n"
2050     "    --to-stdout\n"
2051     " -d --decompress      uncompress files\n"
2052     "    --uncompress\n"
2053     " -f --force           force overwriting & compress links\n"
2054     " -h --help            display this help\n"
2055     " -k --keep            don't delete input files during operation\n"
2056     " -l --list            list compressed file contents\n"
2057     " -N --name            save or restore original file name and time stamp\n"
2058     " -n --no-name         don't save original file name or time stamp\n"
2059     " -q --quiet           output no warnings\n"
2060     " -r --recursive       recursively compress files in directories\n"
2061     " -S .suf              use suffix .suf instead of .gz\n"
2062     "    --suffix .suf\n"
2063     " -t --test            test compressed file\n"
2064     " -V --version         display program version\n"
2065     " -v --verbose         print extra statistics\n",
2066 #endif
2067             getprogname());
2068         exit(0);
2069 }
2070
2071 #ifndef SMALL
2072 /* display the license information of FreeBSD gzip */
2073 static void
2074 display_license(void)
2075 {
2076
2077         fprintf(stderr, "%s (based on NetBSD gzip 20091011)\n", gzip_version);
2078         fprintf(stderr, "%s\n", gzip_copyright);
2079         exit(0);
2080 }
2081 #endif
2082
2083 /* display the version of NetBSD gzip */
2084 static void
2085 display_version(void)
2086 {
2087
2088         fprintf(stderr, "%s\n", gzip_version);
2089         exit(0);
2090 }
2091
2092 #ifndef NO_BZIP2_SUPPORT
2093 #include "unbzip2.c"
2094 #endif
2095 #ifndef NO_COMPRESS_SUPPORT
2096 #include "zuncompress.c"
2097 #endif
2098 #ifndef NO_PACK_SUPPORT
2099 #include "unpack.c"
2100 #endif
2101
2102 static ssize_t
2103 read_retry(int fd, void *buf, size_t sz)
2104 {
2105         char *cp = buf;
2106         size_t left = MIN(sz, (size_t) SSIZE_MAX);
2107
2108         while (left > 0) {
2109                 ssize_t ret;
2110
2111                 ret = read(fd, cp, left);
2112                 if (ret == -1) {
2113                         return ret;
2114                 } else if (ret == 0) {
2115                         break; /* EOF */
2116                 }
2117                 cp += ret;
2118                 left -= ret;
2119         }
2120
2121         return sz - left;
2122 }