usr.bin/gzip/gzip.c

   1 /*      $NetBSD: gzip.c,v 1.112 2017/08/23 13:04:17 christos Exp $      */
   2
   3 /*-
   4  * SPDX-License-Identifier: BSD-2-Clause-NetBSD
   5  *
   6  * Copyright (c) 1997, 1998, 2003, 2004, 2006, 2008, 2009, 2010, 2011, 2015, 2017
   7  *    Matthew R. Green
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  */
  32
  33 #include <sys/cdefs.h>
  34 #ifndef lint
  35 __COPYRIGHT("@(#) Copyright (c) 1997, 1998, 2003, 2004, 2006, 2008,\
  36  2009, 2010, 2011, 2015, 2017 Matthew R. Green.  All rights reserved.");
  37 __FBSDID("$FreeBSD$");
  38 #endif /* not lint */
  39
  40 /*
  41  * gzip.c -- GPL free gzip using zlib.
  42  *
  43  * RFC 1950 covers the zlib format
  44  * RFC 1951 covers the deflate format
  45  * RFC 1952 covers the gzip format
  46  *
  47  * TODO:
  48  *      - use mmap where possible
  49  *      - make bzip2/compress -v/-t/-l support work as well as possible
  50  */
  51
  52 #include <sys/param.h>
  53 #include <sys/stat.h>
  54 #include <sys/time.h>
  55
  56 #include <inttypes.h>
  57 #include <unistd.h>
  58 #include <stdio.h>
  59 #include <string.h>
  60 #include <stdlib.h>
  61 #include <err.h>
  62 #include <errno.h>
  63 #include <fcntl.h>
  64 #include <zlib.h>
  65 #include <fts.h>
  66 #include <libgen.h>
  67 #include <stdarg.h>
  68 #include <getopt.h>
  69 #include <time.h>
  70
  71 /* what type of file are we dealing with */
  72 enum filetype {
  73         FT_GZIP,
  74 #ifndef NO_BZIP2_SUPPORT
  75         FT_BZIP2,
  76 #endif
  77 #ifndef NO_COMPRESS_SUPPORT
  78         FT_Z,
  79 #endif
  80 #ifndef NO_PACK_SUPPORT
  81         FT_PACK,
  82 #endif
  83 #ifndef NO_XZ_SUPPORT
  84         FT_XZ,
  85 #endif
  86         FT_LAST,
  87         FT_UNKNOWN
  88 };
  89
  90 #ifndef NO_BZIP2_SUPPORT
  91 #include <bzlib.h>
  92
  93 #define BZ2_SUFFIX      ".bz2"
  94 #define BZIP2_MAGIC     "BZh"
  95 #endif
  96
  97 #ifndef NO_COMPRESS_SUPPORT
  98 #define Z_SUFFIX        ".Z"
  99 #define Z_MAGIC         "\037\235"
 100 #endif
 101
 102 #ifndef NO_PACK_SUPPORT
 103 #define PACK_MAGIC      "\037\036"
 104 #endif
 105
 106 #ifndef NO_XZ_SUPPORT
 107 #include <lzma.h>
 108 #define XZ_SUFFIX       ".xz"
 109 #define XZ_MAGIC        "\3757zXZ"
 110 #endif
 111
 112 #define GZ_SUFFIX       ".gz"
 113
 114 #define BUFLEN          (64 * 1024)
 115
 116 #define GZIP_MAGIC0     0x1F
 117 #define GZIP_MAGIC1     0x8B
 118 #define GZIP_OMAGIC1    0x9E
 119
 120 #define GZIP_TIMESTAMP  (off_t)4
 121 #define GZIP_ORIGNAME   (off_t)10
 122
 123 #define HEAD_CRC        0x02
 124 #define EXTRA_FIELD     0x04
 125 #define ORIG_NAME       0x08
 126 #define COMMENT         0x10
 127
 128 #define OS_CODE         3       /* Unix */
 129
 130 typedef struct {
 131     const char  *zipped;
 132     int         ziplen;
 133     const char  *normal;        /* for unzip - must not be longer than zipped */
 134 } suffixes_t;
 135 static suffixes_t suffixes[] = {
 136 #define SUFFIX(Z, N) {Z, sizeof Z - 1, N}
 137         SUFFIX(GZ_SUFFIX,       ""),    /* Overwritten by -S .xxx */
 138 #ifndef SMALL
 139         SUFFIX(GZ_SUFFIX,       ""),
 140         SUFFIX(".z",            ""),
 141         SUFFIX("-gz",           ""),
 142         SUFFIX("-z",            ""),
 143         SUFFIX("_z",            ""),
 144         SUFFIX(".taz",          ".tar"),
 145         SUFFIX(".tgz",          ".tar"),
 146 #ifndef NO_BZIP2_SUPPORT
 147         SUFFIX(BZ2_SUFFIX,      ""),
 148         SUFFIX(".tbz",          ".tar"),
 149         SUFFIX(".tbz2",         ".tar"),
 150 #endif
 151 #ifndef NO_COMPRESS_SUPPORT
 152         SUFFIX(Z_SUFFIX,        ""),
 153 #endif
 154 #ifndef NO_XZ_SUPPORT
 155         SUFFIX(XZ_SUFFIX,       ""),
 156 #endif
 157         SUFFIX(GZ_SUFFIX,       ""),    /* Overwritten by -S "" */
 158 #endif /* SMALL */
 159 #undef SUFFIX
 160 };
 161 #define NUM_SUFFIXES (nitems(suffixes))
 162 #define SUFFIX_MAXLEN   30
 163
 164 static  const char      gzip_version[] = "FreeBSD gzip 20171121";
 165
 166 #ifndef SMALL
 167 static  const char      gzip_copyright[] = \
 168 "   Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green\n"
 169 "   All rights reserved.\n"
 170 "\n"
 171 "   Redistribution and use in source and binary forms, with or without\n"
 172 "   modification, are permitted provided that the following conditions\n"
 173 "   are met:\n"
 174 "   1. Redistributions of source code must retain the above copyright\n"
 175 "      notice, this list of conditions and the following disclaimer.\n"
 176 "   2. Redistributions in binary form must reproduce the above copyright\n"
 177 "      notice, this list of conditions and the following disclaimer in the\n"
 178 "      documentation and/or other materials provided with the distribution.\n"
 179 "\n"
 180 "   THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n"
 181 "   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n"
 182 "   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n"
 183 "   IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n"
 184 "   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,\n"
 185 "   BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n"
 186 "   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED\n"
 187 "   AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,\n"
 188 "   OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\n"
 189 "   OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\n"
 190 "   SUCH DAMAGE.";
 191 #endif
 192
 193 static  int     cflag;                  /* stdout mode */
 194 static  int     dflag;                  /* decompress mode */
 195 static  int     lflag;                  /* list mode */
 196 static  int     numflag = 6;            /* gzip -1..-9 value */
 197
 198 static  const char *remove_file = NULL; /* file to be removed upon SIGINT */
 199
 200 static  int     fflag;                  /* force mode */
 201 #ifndef SMALL
 202 static  int     kflag;                  /* don't delete input files */
 203 static  int     nflag;                  /* don't save name/timestamp */
 204 static  int     Nflag;                  /* don't restore name/timestamp */
 205 static  int     qflag;                  /* quiet mode */
 206 static  int     rflag;                  /* recursive mode */
 207 static  int     tflag;                  /* test */
 208 static  int     vflag;                  /* verbose mode */
 209 static  sig_atomic_t print_info = 0;
 210 #else
 211 #define         qflag   0
 212 #define         tflag   0
 213 #endif
 214
 215 static  int     exit_value = 0;         /* exit value */
 216
 217 static  const char *infile;             /* name of file coming in */
 218
 219 static  void    maybe_err(const char *fmt, ...) __printflike(1, 2) __dead2;
 220 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) ||  \
 221     !defined(NO_XZ_SUPPORT)
 222 static  void    maybe_errx(const char *fmt, ...) __printflike(1, 2) __dead2;
 223 #endif
 224 static  void    maybe_warn(const char *fmt, ...) __printflike(1, 2);
 225 static  void    maybe_warnx(const char *fmt, ...) __printflike(1, 2);
 226 static  enum filetype file_gettype(u_char *);
 227 #ifdef SMALL
 228 #define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz)
 229 #endif
 230 static  off_t   gz_compress(int, int, off_t *, const char *, uint32_t);
 231 static  off_t   gz_uncompress(int, int, char *, size_t, off_t *, const char *);
 232 static  off_t   file_compress(char *, char *, size_t);
 233 static  off_t   file_uncompress(char *, char *, size_t);
 234 static  void    handle_pathname(char *);
 235 static  void    handle_file(char *, struct stat *);
 236 static  void    handle_stdin(void);
 237 static  void    handle_stdout(void);
 238 static  void    print_ratio(off_t, off_t, FILE *);
 239 static  void    print_list(int fd, off_t, const char *, time_t);
 240 static  void    usage(void) __dead2;
 241 static  void    display_version(void) __dead2;
 242 #ifndef SMALL
 243 static  void    display_license(void);
 244 #endif
 245 static  const suffixes_t *check_suffix(char *, int);
 246 static  ssize_t read_retry(int, void *, size_t);
 247 static  ssize_t write_retry(int, const void *, size_t);
 248
 249 #ifdef SMALL
 250 #define infile_set(f,t) infile_set(f)
 251 #endif
 252 static  void    infile_set(const char *newinfile, off_t total);
 253
 254 #ifdef SMALL
 255 #define unlink_input(f, sb) unlink(f)
 256 #define check_siginfo() /* nothing */
 257 #define setup_signals() /* nothing */
 258 #define infile_newdata(t) /* nothing */
 259 #else
 260 static  off_t   infile_total;           /* total expected to read/write */
 261 static  off_t   infile_current;         /* current read/write */
 262
 263 static  void    check_siginfo(void);
 264 static  off_t   cat_fd(unsigned char *, size_t, off_t *, int fd);
 265 static  void    prepend_gzip(char *, int *, char ***);
 266 static  void    handle_dir(char *);
 267 static  void    print_verbage(const char *, const char *, off_t, off_t);
 268 static  void    print_test(const char *, int);
 269 static  void    copymodes(int fd, const struct stat *, const char *file);
 270 static  int     check_outfile(const char *outfile);
 271 static  void    setup_signals(void);
 272 static  void    infile_newdata(size_t newdata);
 273 static  void    infile_clear(void);
 274 #endif
 275
 276 #ifndef NO_BZIP2_SUPPORT
 277 static  off_t   unbzip2(int, int, char *, size_t, off_t *);
 278 #endif
 279
 280 #ifndef NO_COMPRESS_SUPPORT
 281 static  FILE    *zdopen(int);
 282 static  off_t   zuncompress(FILE *, FILE *, char *, size_t, off_t *);
 283 #endif
 284
 285 #ifndef NO_PACK_SUPPORT
 286 static  off_t   unpack(int, int, char *, size_t, off_t *);
 287 #endif
 288
 289 #ifndef NO_XZ_SUPPORT
 290 static  off_t   unxz(int, int, char *, size_t, off_t *);
 291 #endif
 292
 293 #ifdef SMALL
 294 #define getopt_long(a,b,c,d,e) getopt(a,b,c)
 295 #else
 296 static const struct option longopts[] = {
 297         { "stdout",             no_argument,            0,      'c' },
 298         { "to-stdout",          no_argument,            0,      'c' },
 299         { "decompress",         no_argument,            0,      'd' },
 300         { "uncompress",         no_argument,            0,      'd' },
 301         { "force",              no_argument,            0,      'f' },
 302         { "help",               no_argument,            0,      'h' },
 303         { "keep",               no_argument,            0,      'k' },
 304         { "list",               no_argument,            0,      'l' },
 305         { "no-name",            no_argument,            0,      'n' },
 306         { "name",               no_argument,            0,      'N' },
 307         { "quiet",              no_argument,            0,      'q' },
 308         { "recursive",          no_argument,            0,      'r' },
 309         { "suffix",             required_argument,      0,      'S' },
 310         { "test",               no_argument,            0,      't' },
 311         { "verbose",            no_argument,            0,      'v' },
 312         { "version",            no_argument,            0,      'V' },
 313         { "fast",               no_argument,            0,      '1' },
 314         { "best",               no_argument,            0,      '9' },
 315         { "ascii",              no_argument,            0,      'a' },
 316         { "license",            no_argument,            0,      'L' },
 317         { NULL,                 no_argument,            0,      0 },
 318 };
 319 #endif
 320
 321 int
 322 main(int argc, char **argv)
 323 {
 324         const char *progname = getprogname();
 325 #ifndef SMALL
 326         char *gzip;
 327         int len;
 328 #endif
 329         int ch;
 330
 331         setup_signals();
 332
 333 #ifndef SMALL
 334         if ((gzip = getenv("GZIP")) != NULL)
 335                 prepend_gzip(gzip, &argc, &argv);
 336 #endif
 337
 338         /*
 339          * XXX
 340          * handle being called `gunzip', `zcat' and `gzcat'
 341          */
 342         if (strcmp(progname, "gunzip") == 0)
 343                 dflag = 1;
 344         else if (strcmp(progname, "zcat") == 0 ||
 345                  strcmp(progname, "gzcat") == 0)
 346                 dflag = cflag = 1;
 347
 348 #ifdef SMALL
 349 #define OPT_LIST "123456789cdhlV"
 350 #else
 351 #define OPT_LIST "123456789acdfhklLNnqrS:tVv"
 352 #endif
 353
 354         while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) {
 355                 switch (ch) {
 356                 case '1': case '2': case '3':
 357                 case '4': case '5': case '6':
 358                 case '7': case '8': case '9':
 359                         numflag = ch - '0';
 360                         break;
 361                 case 'c':
 362                         cflag = 1;
 363                         break;
 364                 case 'd':
 365                         dflag = 1;
 366                         break;
 367                 case 'l':
 368                         lflag = 1;
 369                         dflag = 1;
 370                         break;
 371                 case 'V':
 372                         display_version();
 373                         /* NOTREACHED */
 374 #ifndef SMALL
 375                 case 'a':
 376                         fprintf(stderr, "%s: option --ascii ignored on this system\n", progname);
 377                         break;
 378                 case 'f':
 379                         fflag = 1;
 380                         break;
 381                 case 'k':
 382                         kflag = 1;
 383                         break;
 384                 case 'L':
 385                         display_license();
 386                         /* NOT REACHED */
 387                 case 'N':
 388                         nflag = 0;
 389                         Nflag = 1;
 390                         break;
 391                 case 'n':
 392                         nflag = 1;
 393                         Nflag = 0;
 394                         break;
 395                 case 'q':
 396                         qflag = 1;
 397                         break;
 398                 case 'r':
 399                         rflag = 1;
 400                         break;
 401                 case 'S':
 402                         len = strlen(optarg);
 403                         if (len != 0) {
 404                                 if (len > SUFFIX_MAXLEN)
 405                                         errx(1, "incorrect suffix: '%s': too long", optarg);
 406                                 suffixes[0].zipped = optarg;
 407                                 suffixes[0].ziplen = len;
 408                         } else {
 409                                 suffixes[NUM_SUFFIXES - 1].zipped = "";
 410                                 suffixes[NUM_SUFFIXES - 1].ziplen = 0;
 411                         }
 412                         break;
 413                 case 't':
 414                         cflag = 1;
 415                         tflag = 1;
 416                         dflag = 1;
 417                         break;
 418                 case 'v':
 419                         vflag = 1;
 420                         break;
 421 #endif
 422                 default:
 423                         usage();
 424                         /* NOTREACHED */
 425                 }
 426         }
 427         argv += optind;
 428         argc -= optind;
 429
 430         if (argc == 0) {
 431                 if (dflag)      /* stdin mode */
 432                         handle_stdin();
 433                 else            /* stdout mode */
 434                         handle_stdout();
 435         } else {
 436                 do {
 437                         handle_pathname(argv[0]);
 438                 } while (*++argv);
 439         }
 440 #ifndef SMALL
 441         if (qflag == 0 && lflag && argc > 1)
 442                 print_list(-1, 0, "(totals)", 0);
 443 #endif
 444         exit(exit_value);
 445 }
 446
 447 /* maybe print a warning */
 448 void
 449 maybe_warn(const char *fmt, ...)
 450 {
 451         va_list ap;
 452
 453         if (qflag == 0) {
 454                 va_start(ap, fmt);
 455                 vwarn(fmt, ap);
 456                 va_end(ap);
 457         }
 458         if (exit_value == 0)
 459                 exit_value = 1;
 460 }
 461
 462 /* ... without an errno. */
 463 void
 464 maybe_warnx(const char *fmt, ...)
 465 {
 466         va_list ap;
 467
 468         if (qflag == 0) {
 469                 va_start(ap, fmt);
 470                 vwarnx(fmt, ap);
 471                 va_end(ap);
 472         }
 473         if (exit_value == 0)
 474                 exit_value = 1;
 475 }
 476
 477 /* maybe print an error */
 478 void
 479 maybe_err(const char *fmt, ...)
 480 {
 481         va_list ap;
 482
 483         if (qflag == 0) {
 484                 va_start(ap, fmt);
 485                 vwarn(fmt, ap);
 486                 va_end(ap);
 487         }
 488         exit(2);
 489 }
 490
 491 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) ||  \
 492     !defined(NO_XZ_SUPPORT)
 493 /* ... without an errno. */
 494 void
 495 maybe_errx(const char *fmt, ...)
 496 {
 497         va_list ap;
 498
 499         if (qflag == 0) {
 500                 va_start(ap, fmt);
 501                 vwarnx(fmt, ap);
 502                 va_end(ap);
 503         }
 504         exit(2);
 505 }
 506 #endif
 507
 508 #ifndef SMALL
 509 /* split up $GZIP and prepend it to the argument list */
 510 static void
 511 prepend_gzip(char *gzip, int *argc, char ***argv)
 512 {
 513         char *s, **nargv, **ac;
 514         int nenvarg = 0, i;
 515
 516         /* scan how many arguments there are */
 517         for (s = gzip;;) {
 518                 while (*s == ' ' || *s == '\t')
 519                         s++;
 520                 if (*s == 0)
 521                         goto count_done;
 522                 nenvarg++;
 523                 while (*s != ' ' && *s != '\t')
 524                         if (*s++ == 0)
 525                                 goto count_done;
 526         }
 527 count_done:
 528         /* punt early */
 529         if (nenvarg == 0)
 530                 return;
 531
 532         *argc += nenvarg;
 533         ac = *argv;
 534
 535         nargv = (char **)malloc((*argc + 1) * sizeof(char *));
 536         if (nargv == NULL)
 537                 maybe_err("malloc");
 538
 539         /* stash this away */
 540         *argv = nargv;
 541
 542         /* copy the program name first */
 543         i = 0;
 544         nargv[i++] = *(ac++);
 545
 546         /* take a copy of $GZIP and add it to the array */
 547         s = strdup(gzip);
 548         if (s == NULL)
 549                 maybe_err("strdup");
 550         for (;;) {
 551                 /* Skip whitespaces. */
 552                 while (*s == ' ' || *s == '\t')
 553                         s++;
 554                 if (*s == 0)
 555                         goto copy_done;
 556                 nargv[i++] = s;
 557                 /* Find the end of this argument. */
 558                 while (*s != ' ' && *s != '\t')
 559                         if (*s++ == 0)
 560                                 /* Argument followed by NUL. */
 561                                 goto copy_done;
 562                 /* Terminate by overwriting ' ' or '\t' with NUL. */
 563                 *s++ = 0;
 564         }
 565 copy_done:
 566
 567         /* copy the original arguments and a NULL */
 568         while (*ac)
 569                 nargv[i++] = *(ac++);
 570         nargv[i] = NULL;
 571 }
 572 #endif
 573
 574 /* compress input to output. Return bytes read, -1 on error */
 575 static off_t
 576 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime)
 577 {
 578         z_stream z;
 579         char *outbufp, *inbufp;
 580         off_t in_tot = 0, out_tot = 0;
 581         ssize_t in_size;
 582         int i, error;
 583         uLong crc;
 584 #ifdef SMALL
 585         static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0,
 586                                  0, 0, 0, 0,
 587                                  0, OS_CODE };
 588 #endif
 589
 590         outbufp = malloc(BUFLEN);
 591         inbufp = malloc(BUFLEN);
 592         if (outbufp == NULL || inbufp == NULL) {
 593                 maybe_err("malloc failed");
 594                 goto out;
 595         }
 596
 597         memset(&z, 0, sizeof z);
 598         z.zalloc = Z_NULL;
 599         z.zfree = Z_NULL;
 600         z.opaque = 0;
 601
 602 #ifdef SMALL
 603         memcpy(outbufp, header, sizeof header);
 604         i = sizeof header;
 605 #else
 606         if (nflag != 0) {
 607                 mtime = 0;
 608                 origname = "";
 609         }
 610
 611         i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s",
 612                      GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED,
 613                      *origname ? ORIG_NAME : 0,
 614                      mtime & 0xff,
 615                      (mtime >> 8) & 0xff,
 616                      (mtime >> 16) & 0xff,
 617                      (mtime >> 24) & 0xff,
 618                      numflag == 1 ? 4 : numflag == 9 ? 2 : 0,
 619                      OS_CODE, origname);
 620         if (i >= BUFLEN)
 621                 /* this need PATH_MAX > BUFLEN ... */
 622                 maybe_err("snprintf");
 623         if (*origname)
 624                 i++;
 625 #endif
 626
 627         z.next_out = (unsigned char *)outbufp + i;
 628         z.avail_out = BUFLEN - i;
 629
 630         error = deflateInit2(&z, numflag, Z_DEFLATED,
 631                              (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY);
 632         if (error != Z_OK) {
 633                 maybe_warnx("deflateInit2 failed");
 634                 in_tot = -1;
 635                 goto out;
 636         }
 637
 638         crc = crc32(0L, Z_NULL, 0);
 639         for (;;) {
 640                 if (z.avail_out == 0) {
 641                         if (write_retry(out, outbufp, BUFLEN) != BUFLEN) {
 642                                 maybe_warn("write");
 643                                 out_tot = -1;
 644                                 goto out;
 645                         }
 646
 647                         out_tot += BUFLEN;
 648                         z.next_out = (unsigned char *)outbufp;
 649                         z.avail_out = BUFLEN;
 650                 }
 651
 652                 if (z.avail_in == 0) {
 653                         in_size = read(in, inbufp, BUFLEN);
 654                         if (in_size < 0) {
 655                                 maybe_warn("read");
 656                                 in_tot = -1;
 657                                 goto out;
 658                         }
 659                         if (in_size == 0)
 660                                 break;
 661                         infile_newdata(in_size);
 662
 663                         crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size);
 664                         in_tot += in_size;
 665                         z.next_in = (unsigned char *)inbufp;
 666                         z.avail_in = in_size;
 667                 }
 668
 669                 error = deflate(&z, Z_NO_FLUSH);
 670                 if (error != Z_OK && error != Z_STREAM_END) {
 671                         maybe_warnx("deflate failed");
 672                         in_tot = -1;
 673                         goto out;
 674                 }
 675         }
 676
 677         /* clean up */
 678         for (;;) {
 679                 size_t len;
 680                 ssize_t w;
 681
 682                 error = deflate(&z, Z_FINISH);
 683                 if (error != Z_OK && error != Z_STREAM_END) {
 684                         maybe_warnx("deflate failed");
 685                         in_tot = -1;
 686                         goto out;
 687                 }
 688
 689                 len = (char *)z.next_out - outbufp;
 690
 691                 w = write_retry(out, outbufp, len);
 692                 if (w == -1 || (size_t)w != len) {
 693                         maybe_warn("write");
 694                         out_tot = -1;
 695                         goto out;
 696                 }
 697                 out_tot += len;
 698                 z.next_out = (unsigned char *)outbufp;
 699                 z.avail_out = BUFLEN;
 700
 701                 if (error == Z_STREAM_END)
 702                         break;
 703         }
 704
 705         if (deflateEnd(&z) != Z_OK) {
 706                 maybe_warnx("deflateEnd failed");
 707                 in_tot = -1;
 708                 goto out;
 709         }
 710
 711         i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c",
 712                  (int)crc & 0xff,
 713                  (int)(crc >> 8) & 0xff,
 714                  (int)(crc >> 16) & 0xff,
 715                  (int)(crc >> 24) & 0xff,
 716                  (int)in_tot & 0xff,
 717                  (int)(in_tot >> 8) & 0xff,
 718                  (int)(in_tot >> 16) & 0xff,
 719                  (int)(in_tot >> 24) & 0xff);
 720         if (i != 8)
 721                 maybe_err("snprintf");
 722         if (write_retry(out, outbufp, i) != i) {
 723                 maybe_warn("write");
 724                 in_tot = -1;
 725         } else
 726                 out_tot += i;
 727
 728 out:
 729         if (inbufp != NULL)
 730                 free(inbufp);
 731         if (outbufp != NULL)
 732                 free(outbufp);
 733         if (gsizep)
 734                 *gsizep = out_tot;
 735         return in_tot;
 736 }
 737
 738 /*
 739  * uncompress input to output then close the input.  return the
 740  * uncompressed size written, and put the compressed sized read
 741  * into `*gsizep'.
 742  */
 743 static off_t
 744 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
 745               const char *filename)
 746 {
 747         z_stream z;
 748         char *outbufp, *inbufp;
 749         off_t out_tot = -1, in_tot = 0;
 750         uint32_t out_sub_tot = 0;
 751         enum {
 752                 GZSTATE_MAGIC0,
 753                 GZSTATE_MAGIC1,
 754                 GZSTATE_METHOD,
 755                 GZSTATE_FLAGS,
 756                 GZSTATE_SKIPPING,
 757                 GZSTATE_EXTRA,
 758                 GZSTATE_EXTRA2,
 759                 GZSTATE_EXTRA3,
 760                 GZSTATE_ORIGNAME,
 761                 GZSTATE_COMMENT,
 762                 GZSTATE_HEAD_CRC1,
 763                 GZSTATE_HEAD_CRC2,
 764                 GZSTATE_INIT,
 765                 GZSTATE_READ,
 766                 GZSTATE_CRC,
 767                 GZSTATE_LEN,
 768         } state = GZSTATE_MAGIC0;
 769         int flags = 0, skip_count = 0;
 770         int error = Z_STREAM_ERROR, done_reading = 0;
 771         uLong crc = 0;
 772         ssize_t wr;
 773         int needmore = 0;
 774
 775 #define ADVANCE()       { z.next_in++; z.avail_in--; }
 776
 777         if ((outbufp = malloc(BUFLEN)) == NULL) {
 778                 maybe_err("malloc failed");
 779                 goto out2;
 780         }
 781         if ((inbufp = malloc(BUFLEN)) == NULL) {
 782                 maybe_err("malloc failed");
 783                 goto out1;
 784         }
 785
 786         memset(&z, 0, sizeof z);
 787         z.avail_in = prelen;
 788         z.next_in = (unsigned char *)pre;
 789         z.avail_out = BUFLEN;
 790         z.next_out = (unsigned char *)outbufp;
 791         z.zalloc = NULL;
 792         z.zfree = NULL;
 793         z.opaque = 0;
 794
 795         in_tot = prelen;
 796         out_tot = 0;
 797
 798         for (;;) {
 799                 check_siginfo();
 800                 if ((z.avail_in == 0 || needmore) && done_reading == 0) {
 801                         ssize_t in_size;
 802
 803                         if (z.avail_in > 0) {
 804                                 memmove(inbufp, z.next_in, z.avail_in);
 805                         }
 806                         z.next_in = (unsigned char *)inbufp;
 807                         in_size = read(in, z.next_in + z.avail_in,
 808                             BUFLEN - z.avail_in);
 809
 810                         if (in_size == -1) {
 811                                 maybe_warn("failed to read stdin");
 812                                 goto stop_and_fail;
 813                         } else if (in_size == 0) {
 814                                 done_reading = 1;
 815                         }
 816                         infile_newdata(in_size);
 817
 818                         z.avail_in += in_size;
 819                         needmore = 0;
 820
 821                         in_tot += in_size;
 822                 }
 823                 if (z.avail_in == 0) {
 824                         if (done_reading && state != GZSTATE_MAGIC0) {
 825                                 maybe_warnx("%s: unexpected end of file",
 826                                             filename);
 827                                 goto stop_and_fail;
 828                         }
 829                         goto stop;
 830                 }
 831                 switch (state) {
 832                 case GZSTATE_MAGIC0:
 833                         if (*z.next_in != GZIP_MAGIC0) {
 834                                 if (in_tot > 0) {
 835                                         maybe_warnx("%s: trailing garbage "
 836                                                     "ignored", filename);
 837                                         exit_value = 2;
 838                                         goto stop;
 839                                 }
 840                                 maybe_warnx("input not gziped (MAGIC0)");
 841                                 goto stop_and_fail;
 842                         }
 843                         ADVANCE();
 844                         state++;
 845                         out_sub_tot = 0;
 846                         crc = crc32(0L, Z_NULL, 0);
 847                         break;
 848
 849                 case GZSTATE_MAGIC1:
 850                         if (*z.next_in != GZIP_MAGIC1 &&
 851                             *z.next_in != GZIP_OMAGIC1) {
 852                                 maybe_warnx("input not gziped (MAGIC1)");
 853                                 goto stop_and_fail;
 854                         }
 855                         ADVANCE();
 856                         state++;
 857                         break;
 858
 859                 case GZSTATE_METHOD:
 860                         if (*z.next_in != Z_DEFLATED) {
 861                                 maybe_warnx("unknown compression method");
 862                                 goto stop_and_fail;
 863                         }
 864                         ADVANCE();
 865                         state++;
 866                         break;
 867
 868                 case GZSTATE_FLAGS:
 869                         flags = *z.next_in;
 870                         ADVANCE();
 871                         skip_count = 6;
 872                         state++;
 873                         break;
 874
 875                 case GZSTATE_SKIPPING:
 876                         if (skip_count > 0) {
 877                                 skip_count--;
 878                                 ADVANCE();
 879                         } else
 880                                 state++;
 881                         break;
 882
 883                 case GZSTATE_EXTRA:
 884                         if ((flags & EXTRA_FIELD) == 0) {
 885                                 state = GZSTATE_ORIGNAME;
 886                                 break;
 887                         }
 888                         skip_count = *z.next_in;
 889                         ADVANCE();
 890                         state++;
 891                         break;
 892
 893                 case GZSTATE_EXTRA2:
 894                         skip_count |= ((*z.next_in) << 8);
 895                         ADVANCE();
 896                         state++;
 897                         break;
 898
 899                 case GZSTATE_EXTRA3:
 900                         if (skip_count > 0) {
 901                                 skip_count--;
 902                                 ADVANCE();
 903                         } else
 904                                 state++;
 905                         break;
 906
 907                 case GZSTATE_ORIGNAME:
 908                         if ((flags & ORIG_NAME) == 0) {
 909                                 state++;
 910                                 break;
 911                         }
 912                         if (*z.next_in == 0)
 913                                 state++;
 914                         ADVANCE();
 915                         break;
 916
 917                 case GZSTATE_COMMENT:
 918                         if ((flags & COMMENT) == 0) {
 919                                 state++;
 920                                 break;
 921                         }
 922                         if (*z.next_in == 0)
 923                                 state++;
 924                         ADVANCE();
 925                         break;
 926
 927                 case GZSTATE_HEAD_CRC1:
 928                         if (flags & HEAD_CRC)
 929                                 skip_count = 2;
 930                         else
 931                                 skip_count = 0;
 932                         state++;
 933                         break;
 934
 935                 case GZSTATE_HEAD_CRC2:
 936                         if (skip_count > 0) {
 937                                 skip_count--;
 938                                 ADVANCE();
 939                         } else
 940                                 state++;
 941                         break;
 942
 943                 case GZSTATE_INIT:
 944                         if (inflateInit2(&z, -MAX_WBITS) != Z_OK) {
 945                                 maybe_warnx("failed to inflateInit");
 946                                 goto stop_and_fail;
 947                         }
 948                         state++;
 949                         break;
 950
 951                 case GZSTATE_READ:
 952                         error = inflate(&z, Z_FINISH);
 953                         switch (error) {
 954                         /* Z_BUF_ERROR goes with Z_FINISH... */
 955                         case Z_BUF_ERROR:
 956                                 if (z.avail_out > 0 && !done_reading)
 957                                         continue;
 958
 959                         case Z_STREAM_END:
 960                         case Z_OK:
 961                                 break;
 962
 963                         case Z_NEED_DICT:
 964                                 maybe_warnx("Z_NEED_DICT error");
 965                                 goto stop_and_fail;
 966                         case Z_DATA_ERROR:
 967                                 maybe_warnx("data stream error");
 968                                 goto stop_and_fail;
 969                         case Z_STREAM_ERROR:
 970                                 maybe_warnx("internal stream error");
 971                                 goto stop_and_fail;
 972                         case Z_MEM_ERROR:
 973                                 maybe_warnx("memory allocation error");
 974                                 goto stop_and_fail;
 975
 976                         default:
 977                                 maybe_warn("unknown error from inflate(): %d",
 978                                     error);
 979                         }
 980                         wr = BUFLEN - z.avail_out;
 981
 982                         if (wr != 0) {
 983                                 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr);
 984                                 if (
 985 #ifndef SMALL
 986                                     /* don't write anything with -t */
 987                                     tflag == 0 &&
 988 #endif
 989                                     write_retry(out, outbufp, wr) != wr) {
 990                                         maybe_warn("error writing to output");
 991                                         goto stop_and_fail;
 992                                 }
 993
 994                                 out_tot += wr;
 995                                 out_sub_tot += wr;
 996                         }
 997
 998                         if (error == Z_STREAM_END) {
 999                                 inflateEnd(&z);
1000                                 state++;
1001                         }
1002
1003                         z.next_out = (unsigned char *)outbufp;
1004                         z.avail_out = BUFLEN;
1005
1006                         break;
1007                 case GZSTATE_CRC:
1008                         {
1009                                 uLong origcrc;
1010
1011                                 if (z.avail_in < 4) {
1012                                         if (!done_reading) {
1013                                                 needmore = 1;
1014                                                 continue;
1015                                         }
1016                                         maybe_warnx("truncated input");
1017                                         goto stop_and_fail;
1018                                 }
1019                                 origcrc = ((unsigned)z.next_in[0] & 0xff) |
1020                                         ((unsigned)z.next_in[1] & 0xff) << 8 |
1021                                         ((unsigned)z.next_in[2] & 0xff) << 16 |
1022                                         ((unsigned)z.next_in[3] & 0xff) << 24;
1023                                 if (origcrc != crc) {
1024                                         maybe_warnx("invalid compressed"
1025                                              " data--crc error");
1026                                         goto stop_and_fail;
1027                                 }
1028                         }
1029
1030                         z.avail_in -= 4;
1031                         z.next_in += 4;
1032
1033                         if (!z.avail_in && done_reading) {
1034                                 goto stop;
1035                         }
1036                         state++;
1037                         break;
1038                 case GZSTATE_LEN:
1039                         {
1040                                 uLong origlen;
1041
1042                                 if (z.avail_in < 4) {
1043                                         if (!done_reading) {
1044                                                 needmore = 1;
1045                                                 continue;
1046                                         }
1047                                         maybe_warnx("truncated input");
1048                                         goto stop_and_fail;
1049                                 }
1050                                 origlen = ((unsigned)z.next_in[0] & 0xff) |
1051                                         ((unsigned)z.next_in[1] & 0xff) << 8 |
1052                                         ((unsigned)z.next_in[2] & 0xff) << 16 |
1053                                         ((unsigned)z.next_in[3] & 0xff) << 24;
1054
1055                                 if (origlen != out_sub_tot) {
1056                                         maybe_warnx("invalid compressed"
1057                                              " data--length error");
1058                                         goto stop_and_fail;
1059                                 }
1060                         }
1061
1062                         z.avail_in -= 4;
1063                         z.next_in += 4;
1064
1065                         if (error < 0) {
1066                                 maybe_warnx("decompression error");
1067                                 goto stop_and_fail;
1068                         }
1069                         state = GZSTATE_MAGIC0;
1070                         break;
1071                 }
1072                 continue;
1073 stop_and_fail:
1074                 out_tot = -1;
1075 stop:
1076                 break;
1077         }
1078         if (state > GZSTATE_INIT)
1079                 inflateEnd(&z);
1080
1081         free(inbufp);
1082 out1:
1083         free(outbufp);
1084 out2:
1085         if (gsizep)
1086                 *gsizep = in_tot;
1087         return (out_tot);
1088 }
1089
1090 #ifndef SMALL
1091 /*
1092  * set the owner, mode, flags & utimes using the given file descriptor.
1093  * file is only used in possible warning messages.
1094  */
1095 static void
1096 copymodes(int fd, const struct stat *sbp, const char *file)
1097 {
1098         struct timespec times[2];
1099         struct stat sb;
1100
1101         /*
1102          * If we have no info on the input, give this file some
1103          * default values and return..
1104          */
1105         if (sbp == NULL) {
1106                 mode_t mask = umask(022);
1107
1108                 (void)fchmod(fd, DEFFILEMODE & ~mask);
1109                 (void)umask(mask);
1110                 return;
1111         }
1112         sb = *sbp;
1113
1114         /* if the chown fails, remove set-id bits as-per compress(1) */
1115         if (fchown(fd, sb.st_uid, sb.st_gid) < 0) {
1116                 if (errno != EPERM)
1117                         maybe_warn("couldn't fchown: %s", file);
1118                 sb.st_mode &= ~(S_ISUID|S_ISGID);
1119         }
1120
1121         /* we only allow set-id and the 9 normal permission bits */
1122         sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
1123         if (fchmod(fd, sb.st_mode) < 0)
1124                 maybe_warn("couldn't fchmod: %s", file);
1125
1126         times[0] = sb.st_atim;
1127         times[1] = sb.st_mtim;
1128         if (futimens(fd, times) < 0)
1129                 maybe_warn("couldn't futimens: %s", file);
1130
1131         /* only try flags if they exist already */
1132         if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0)
1133                 maybe_warn("couldn't fchflags: %s", file);
1134 }
1135 #endif
1136
1137 /* what sort of file is this? */
1138 static enum filetype
1139 file_gettype(u_char *buf)
1140 {
1141
1142         if (buf[0] == GZIP_MAGIC0 &&
1143             (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
1144                 return FT_GZIP;
1145         else
1146 #ifndef NO_BZIP2_SUPPORT
1147         if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
1148             buf[3] >= '0' && buf[3] <= '9')
1149                 return FT_BZIP2;
1150         else
1151 #endif
1152 #ifndef NO_COMPRESS_SUPPORT
1153         if (memcmp(buf, Z_MAGIC, 2) == 0)
1154                 return FT_Z;
1155         else
1156 #endif
1157 #ifndef NO_PACK_SUPPORT
1158         if (memcmp(buf, PACK_MAGIC, 2) == 0)
1159                 return FT_PACK;
1160         else
1161 #endif
1162 #ifndef NO_XZ_SUPPORT
1163         if (memcmp(buf, XZ_MAGIC, 4) == 0)      /* XXX: We only have 4 bytes */
1164                 return FT_XZ;
1165         else
1166 #endif
1167                 return FT_UNKNOWN;
1168 }
1169
1170 #ifndef SMALL
1171 /* check the outfile is OK. */
1172 static int
1173 check_outfile(const char *outfile)
1174 {
1175         struct stat sb;
1176         int ok = 1;
1177
1178         if (lflag == 0 && stat(outfile, &sb) == 0) {
1179                 if (fflag)
1180                         unlink(outfile);
1181                 else if (isatty(STDIN_FILENO)) {
1182                         char ans[10] = { 'n', '\0' };   /* default */
1183
1184                         fprintf(stderr, "%s already exists -- do you wish to "
1185                                         "overwrite (y or n)? " , outfile);
1186                         (void)fgets(ans, sizeof(ans) - 1, stdin);
1187                         if (ans[0] != 'y' && ans[0] != 'Y') {
1188                                 fprintf(stderr, "\tnot overwriting\n");
1189                                 ok = 0;
1190                         } else
1191                                 unlink(outfile);
1192                 } else {
1193                         maybe_warnx("%s already exists -- skipping", outfile);
1194                         ok = 0;
1195                 }
1196         }
1197         return ok;
1198 }
1199
1200 static void
1201 unlink_input(const char *file, const struct stat *sb)
1202 {
1203         struct stat nsb;
1204
1205         if (kflag)
1206                 return;
1207         if (stat(file, &nsb) != 0)
1208                 /* Must be gone already */
1209                 return;
1210         if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
1211                 /* Definitely a different file */
1212                 return;
1213         unlink(file);
1214 }
1215
1216 static void
1217 got_sigint(int signo __unused)
1218 {
1219
1220         if (remove_file != NULL)
1221                 unlink(remove_file);
1222         _exit(2);
1223 }
1224
1225 static void
1226 got_siginfo(int signo __unused)
1227 {
1228
1229         print_info = 1;
1230 }
1231
1232 static void
1233 setup_signals(void)
1234 {
1235
1236         signal(SIGINFO, got_siginfo);
1237         signal(SIGINT, got_sigint);
1238 }
1239
1240 static  void
1241 infile_newdata(size_t newdata)
1242 {
1243
1244         infile_current += newdata;
1245 }
1246 #endif
1247
1248 static  void
1249 infile_set(const char *newinfile, off_t total)
1250 {
1251
1252         if (newinfile)
1253                 infile = newinfile;
1254 #ifndef SMALL
1255         infile_total = total;
1256 #endif
1257 }
1258
1259 static  void
1260 infile_clear(void)
1261 {
1262
1263         infile = NULL;
1264 #ifndef SMALL
1265         infile_total = infile_current = 0;
1266 #endif
1267 }
1268
1269 static const suffixes_t *
1270 check_suffix(char *file, int xlate)
1271 {
1272         const suffixes_t *s;
1273         int len = strlen(file);
1274         char *sp;
1275
1276         for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
1277                 /* if it doesn't fit in "a.suf", don't bother */
1278                 if (s->ziplen >= len)
1279                         continue;
1280                 sp = file + len - s->ziplen;
1281                 if (strcmp(s->zipped, sp) != 0)
1282                         continue;
1283                 if (xlate)
1284                         strcpy(sp, s->normal);
1285                 return s;
1286         }
1287         return NULL;
1288 }
1289
1290 /*
1291  * compress the given file: create a corresponding .gz file and remove the
1292  * original.
1293  */
1294 static off_t
1295 file_compress(char *file, char *outfile, size_t outsize)
1296 {
1297         int in;
1298         int out;
1299         off_t size, in_size;
1300 #ifndef SMALL
1301         struct stat isb, osb;
1302         const suffixes_t *suff;
1303 #endif
1304
1305         in = open(file, O_RDONLY);
1306         if (in == -1) {
1307                 maybe_warn("can't open %s", file);
1308                 return (-1);
1309         }
1310
1311 #ifndef SMALL
1312         if (fstat(in, &isb) != 0) {
1313                 maybe_warn("couldn't stat: %s", file);
1314                 close(in);
1315                 return (-1);
1316         }
1317 #endif
1318
1319 #ifndef SMALL
1320         if (fstat(in, &isb) != 0) {
1321                 close(in);
1322                 maybe_warn("can't stat %s", file);
1323                 return -1;
1324         }
1325         infile_set(file, isb.st_size);
1326 #endif
1327
1328         if (cflag == 0) {
1329 #ifndef SMALL
1330                 if (isb.st_nlink > 1 && fflag == 0) {
1331                         maybe_warnx("%s has %ju other link%s -- "
1332                                     "skipping", file,
1333                                     (uintmax_t)isb.st_nlink - 1,
1334                                     isb.st_nlink == 1 ? "" : "s");
1335                         close(in);
1336                         return -1;
1337                 }
1338
1339                 if (fflag == 0 && (suff = check_suffix(file, 0)) &&
1340                     suff->zipped[0] != 0) {
1341                         maybe_warnx("%s already has %s suffix -- unchanged",
1342                             file, suff->zipped);
1343                         close(in);
1344                         return (-1);
1345                 }
1346 #endif
1347
1348                 /* Add (usually) .gz to filename */
1349                 if ((size_t)snprintf(outfile, outsize, "%s%s",
1350                     file, suffixes[0].zipped) >= outsize)
1351                         memcpy(outfile + outsize - suffixes[0].ziplen - 1,
1352                             suffixes[0].zipped, suffixes[0].ziplen + 1);
1353
1354 #ifndef SMALL
1355                 if (check_outfile(outfile) == 0) {
1356                         close(in);
1357                         return (-1);
1358                 }
1359 #endif
1360         }
1361
1362         if (cflag == 0) {
1363                 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
1364                 if (out == -1) {
1365                         maybe_warn("could not create output: %s", outfile);
1366                         fclose(stdin);
1367                         return (-1);
1368                 }
1369 #ifndef SMALL
1370                 remove_file = outfile;
1371 #endif
1372         } else
1373                 out = STDOUT_FILENO;
1374
1375         in_size = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
1376
1377         (void)close(in);
1378
1379         /*
1380          * If there was an error, in_size will be -1.
1381          * If we compressed to stdout, just return the size.
1382          * Otherwise stat the file and check it is the correct size.
1383          * We only blow away the file if we can stat the output and it
1384          * has the expected size.
1385          */
1386         if (cflag != 0)
1387                 return in_size == -1 ? -1 : size;
1388
1389 #ifndef SMALL
1390         if (fstat(out, &osb) != 0) {
1391                 maybe_warn("couldn't stat: %s", outfile);
1392                 goto bad_outfile;
1393         }
1394
1395         if (osb.st_size != size) {
1396                 maybe_warnx("output file: %s wrong size (%ju != %ju), deleting",
1397                     outfile, (uintmax_t)osb.st_size, (uintmax_t)size);
1398                 goto bad_outfile;
1399         }
1400
1401         copymodes(out, &isb, outfile);
1402         remove_file = NULL;
1403 #endif
1404         if (close(out) == -1)
1405                 maybe_warn("couldn't close output");
1406
1407         /* output is good, ok to delete input */
1408         unlink_input(file, &isb);
1409         return (size);
1410
1411 #ifndef SMALL
1412     bad_outfile:
1413         if (close(out) == -1)
1414                 maybe_warn("couldn't close output");
1415
1416         maybe_warnx("leaving original %s", file);
1417         unlink(outfile);
1418         return (size);
1419 #endif
1420 }
1421
1422 /* uncompress the given file and remove the original */
1423 static off_t
1424 file_uncompress(char *file, char *outfile, size_t outsize)
1425 {
1426         struct stat isb, osb;
1427         off_t size;
1428         ssize_t rbytes;
1429         unsigned char header1[4];
1430         enum filetype method;
1431         int fd, ofd, zfd = -1;
1432         size_t in_size;
1433 #ifndef SMALL
1434         ssize_t rv;
1435         time_t timestamp = 0;
1436         char name[PATH_MAX + 1];
1437 #endif
1438
1439         /* gather the old name info */
1440
1441         fd = open(file, O_RDONLY);
1442         if (fd < 0) {
1443                 maybe_warn("can't open %s", file);
1444                 goto lose;
1445         }
1446         if (fstat(fd, &isb) != 0) {
1447                 maybe_warn("can't stat %s", file);
1448                 goto lose;
1449         }
1450         if (S_ISREG(isb.st_mode))
1451                 in_size = isb.st_size;
1452         else
1453                 in_size = 0;
1454         infile_set(file, in_size);
1455
1456         strlcpy(outfile, file, outsize);
1457         if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
1458                 maybe_warnx("%s: unknown suffix -- ignored", file);
1459                 goto lose;
1460         }
1461
1462         rbytes = read(fd, header1, sizeof header1);
1463         if (rbytes != sizeof header1) {
1464                 /* we don't want to fail here. */
1465 #ifndef SMALL
1466                 if (fflag)
1467                         goto lose;
1468 #endif
1469                 if (rbytes == -1)
1470                         maybe_warn("can't read %s", file);
1471                 else
1472                         goto unexpected_EOF;
1473                 goto lose;
1474         }
1475         infile_newdata(rbytes);
1476
1477         method = file_gettype(header1);
1478 #ifndef SMALL
1479         if (fflag == 0 && method == FT_UNKNOWN) {
1480                 maybe_warnx("%s: not in gzip format", file);
1481                 goto lose;
1482         }
1483
1484 #endif
1485
1486 #ifndef SMALL
1487         if (method == FT_GZIP && Nflag) {
1488                 unsigned char ts[4];    /* timestamp */
1489
1490                 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP);
1491                 if (rv >= 0 && rv < (ssize_t)(sizeof ts))
1492                         goto unexpected_EOF;
1493                 if (rv == -1) {
1494                         if (!fflag)
1495                                 maybe_warn("can't read %s", file);
1496                         goto lose;
1497                 }
1498                 infile_newdata(rv);
1499                 timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0];
1500
1501                 if (header1[3] & ORIG_NAME) {
1502                         rbytes = pread(fd, name, sizeof(name) - 1, GZIP_ORIGNAME);
1503                         if (rbytes < 0) {
1504                                 maybe_warn("can't read %s", file);
1505                                 goto lose;
1506                         }
1507                         if (name[0] != '\0') {
1508                                 char *dp, *nf;
1509
1510                                 /* Make sure that name is NUL-terminated */
1511                                 name[rbytes] = '\0';
1512
1513                                 /* strip saved directory name */
1514                                 nf = strrchr(name, '/');
1515                                 if (nf == NULL)
1516                                         nf = name;
1517                                 else
1518                                         nf++;
1519
1520                                 /* preserve original directory name */
1521                                 dp = strrchr(file, '/');
1522                                 if (dp == NULL)
1523                                         dp = file;
1524                                 else
1525                                         dp++;
1526                                 snprintf(outfile, outsize, "%.*s%.*s",
1527                                                 (int) (dp - file),
1528                                                 file, (int) rbytes, nf);
1529                         }
1530                 }
1531         }
1532 #endif
1533         lseek(fd, 0, SEEK_SET);
1534
1535         if (cflag == 0 || lflag) {
1536 #ifndef SMALL
1537                 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
1538                         maybe_warnx("%s has %ju other links -- skipping",
1539                             file, (uintmax_t)isb.st_nlink - 1);
1540                         goto lose;
1541                 }
1542                 if (nflag == 0 && timestamp)
1543                         isb.st_mtime = timestamp;
1544                 if (check_outfile(outfile) == 0)
1545                         goto lose;
1546 #endif
1547         }
1548
1549         if (cflag)
1550                 zfd = STDOUT_FILENO;
1551         else if (lflag)
1552                 zfd = -1;
1553         else {
1554                 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
1555                 if (zfd == STDOUT_FILENO) {
1556                         /* We won't close STDOUT_FILENO later... */
1557                         zfd = dup(zfd);
1558                         close(STDOUT_FILENO);
1559                 }
1560                 if (zfd == -1) {
1561                         maybe_warn("can't open %s", outfile);
1562                         goto lose;
1563                 }
1564                 remove_file = outfile;
1565         }
1566
1567         switch (method) {
1568 #ifndef NO_BZIP2_SUPPORT
1569         case FT_BZIP2:
1570                 /* XXX */
1571                 if (lflag) {
1572                         maybe_warnx("no -l with bzip2 files");
1573                         goto lose;
1574                 }
1575
1576                 size = unbzip2(fd, zfd, NULL, 0, NULL);
1577                 break;
1578 #endif
1579
1580 #ifndef NO_COMPRESS_SUPPORT
1581         case FT_Z: {
1582                 FILE *in, *out;
1583
1584                 /* XXX */
1585                 if (lflag) {
1586                         maybe_warnx("no -l with Lempel-Ziv files");
1587                         goto lose;
1588                 }
1589
1590                 if ((in = zdopen(fd)) == NULL) {
1591                         maybe_warn("zdopen for read: %s", file);
1592                         goto lose;
1593                 }
1594
1595                 out = fdopen(dup(zfd), "w");
1596                 if (out == NULL) {
1597                         maybe_warn("fdopen for write: %s", outfile);
1598                         fclose(in);
1599                         goto lose;
1600                 }
1601
1602                 size = zuncompress(in, out, NULL, 0, NULL);
1603                 /* need to fclose() if ferror() is true... */
1604                 if (ferror(in) | fclose(in)) {
1605                         maybe_warn("failed infile fclose");
1606                         unlink(outfile);
1607                         (void)fclose(out);
1608                 }
1609                 if (fclose(out) != 0) {
1610                         maybe_warn("failed outfile fclose");
1611                         unlink(outfile);
1612                         goto lose;
1613                 }
1614                 break;
1615         }
1616 #endif
1617
1618 #ifndef NO_PACK_SUPPORT
1619         case FT_PACK:
1620                 if (lflag) {
1621                         maybe_warnx("no -l with packed files");
1622                         goto lose;
1623                 }
1624
1625                 size = unpack(fd, zfd, NULL, 0, NULL);
1626                 break;
1627 #endif
1628
1629 #ifndef NO_XZ_SUPPORT
1630         case FT_XZ:
1631                 if (lflag) {
1632                         maybe_warnx("no -l with xz files");
1633                         goto lose;
1634                 }
1635
1636                 size = unxz(fd, zfd, NULL, 0, NULL);
1637                 break;
1638 #endif
1639
1640 #ifndef SMALL
1641         case FT_UNKNOWN:
1642                 if (lflag) {
1643                         maybe_warnx("no -l for unknown filetypes");
1644                         goto lose;
1645                 }
1646                 size = cat_fd(NULL, 0, NULL, fd);
1647                 break;
1648 #endif
1649         default:
1650                 if (lflag) {
1651                         print_list(fd, in_size, outfile, isb.st_mtime);
1652                         close(fd);
1653                         return -1;      /* XXX */
1654                 }
1655
1656                 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
1657                 break;
1658         }
1659
1660         if (close(fd) != 0)
1661                 maybe_warn("couldn't close input");
1662         if (zfd != STDOUT_FILENO && close(zfd) != 0)
1663                 maybe_warn("couldn't close output");
1664
1665         if (size == -1) {
1666                 if (cflag == 0)
1667                         unlink(outfile);
1668                 maybe_warnx("%s: uncompress failed", file);
1669                 return -1;
1670         }
1671
1672         /* if testing, or we uncompressed to stdout, this is all we need */
1673 #ifndef SMALL
1674         if (tflag)
1675                 return size;
1676 #endif
1677         /* if we are uncompressing to stdin, don't remove the file. */
1678         if (cflag)
1679                 return size;
1680
1681         /*
1682          * if we create a file...
1683          */
1684         /*
1685          * if we can't stat the file don't remove the file.
1686          */
1687
1688         ofd = open(outfile, O_RDWR, 0);
1689         if (ofd == -1) {
1690                 maybe_warn("couldn't open (leaving original): %s",
1691                            outfile);
1692                 return -1;
1693         }
1694         if (fstat(ofd, &osb) != 0) {
1695                 maybe_warn("couldn't stat (leaving original): %s",
1696                            outfile);
1697                 close(ofd);
1698                 return -1;
1699         }
1700         if (osb.st_size != size) {
1701                 maybe_warnx("stat gave different size: %ju != %ju (leaving original)",
1702                     (uintmax_t)size, (uintmax_t)osb.st_size);
1703                 close(ofd);
1704                 unlink(outfile);
1705                 return -1;
1706         }
1707 #ifndef SMALL
1708         copymodes(ofd, &isb, outfile);
1709         remove_file = NULL;
1710 #endif
1711         close(ofd);
1712         unlink_input(file, &isb);
1713         return size;
1714
1715     unexpected_EOF:
1716         maybe_warnx("%s: unexpected end of file", file);
1717     lose:
1718         if (fd != -1)
1719                 close(fd);
1720         if (zfd != -1 && zfd != STDOUT_FILENO)
1721                 close(zfd);
1722         return -1;
1723 }
1724
1725 #ifndef SMALL
1726 static void
1727 check_siginfo(void)
1728 {
1729         if (print_info == 0)
1730                 return;
1731         if (infile) {
1732                 if (infile_total) {
1733                         int pcent = (int)((100.0 * infile_current) / infile_total);
1734
1735                         fprintf(stderr, "%s: done %llu/%llu bytes %d%%\n",
1736                                 infile, (unsigned long long)infile_current,
1737                                 (unsigned long long)infile_total, pcent);
1738                 } else
1739                         fprintf(stderr, "%s: done %llu bytes\n",
1740                                 infile, (unsigned long long)infile_current);
1741         }
1742         print_info = 0;
1743 }
1744
1745 static off_t
1746 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd)
1747 {
1748         char buf[BUFLEN];
1749         off_t in_tot;
1750         ssize_t w;
1751
1752         in_tot = count;
1753         w = write_retry(STDOUT_FILENO, prepend, count);
1754         if (w == -1 || (size_t)w != count) {
1755                 maybe_warn("write to stdout");
1756                 return -1;
1757         }
1758         for (;;) {
1759                 ssize_t rv;
1760
1761                 rv = read(fd, buf, sizeof buf);
1762                 if (rv == 0)
1763                         break;
1764                 if (rv < 0) {
1765                         maybe_warn("read from fd %d", fd);
1766                         break;
1767                 }
1768                 infile_newdata(rv);
1769
1770                 if (write_retry(STDOUT_FILENO, buf, rv) != rv) {
1771                         maybe_warn("write to stdout");
1772                         break;
1773                 }
1774                 in_tot += rv;
1775         }
1776
1777         if (gsizep)
1778                 *gsizep = in_tot;
1779         return (in_tot);
1780 }
1781 #endif
1782
1783 static void
1784 handle_stdin(void)
1785 {
1786         struct stat isb;
1787         unsigned char header1[4];
1788         size_t in_size;
1789         off_t usize, gsize;
1790         enum filetype method;
1791         ssize_t bytes_read;
1792 #ifndef NO_COMPRESS_SUPPORT
1793         FILE *in;
1794 #endif
1795
1796 #ifndef SMALL
1797         if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
1798                 maybe_warnx("standard input is a terminal -- ignoring");
1799                 goto out;
1800         }
1801 #endif
1802
1803         if (fstat(STDIN_FILENO, &isb) < 0) {
1804                 maybe_warn("fstat");
1805                 goto out;
1806         }
1807         if (S_ISREG(isb.st_mode))
1808                 in_size = isb.st_size;
1809         else
1810                 in_size = 0;
1811         infile_set("(stdin)", in_size);
1812
1813         if (lflag) {
1814                 print_list(STDIN_FILENO, in_size, infile, isb.st_mtime);
1815                 goto out;
1816         }
1817
1818         bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1);
1819         if (bytes_read == -1) {
1820                 maybe_warn("can't read stdin");
1821                 goto out;
1822         } else if (bytes_read != sizeof(header1)) {
1823                 maybe_warnx("(stdin): unexpected end of file");
1824                 goto out;
1825         }
1826
1827         method = file_gettype(header1);
1828         switch (method) {
1829         default:
1830 #ifndef SMALL
1831                 if (fflag == 0) {
1832                         maybe_warnx("unknown compression format");
1833                         goto out;
1834                 }
1835                 usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO);
1836                 break;
1837 #endif
1838         case FT_GZIP:
1839                 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
1840                               (char *)header1, sizeof header1, &gsize, "(stdin)");
1841                 break;
1842 #ifndef NO_BZIP2_SUPPORT
1843         case FT_BZIP2:
1844                 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
1845                                 (char *)header1, sizeof header1, &gsize);
1846                 break;
1847 #endif
1848 #ifndef NO_COMPRESS_SUPPORT
1849         case FT_Z:
1850                 if ((in = zdopen(STDIN_FILENO)) == NULL) {
1851                         maybe_warnx("zopen of stdin");
1852                         goto out;
1853                 }
1854
1855                 usize = zuncompress(in, stdout, (char *)header1,
1856                     sizeof header1, &gsize);
1857                 fclose(in);
1858                 break;
1859 #endif
1860 #ifndef NO_PACK_SUPPORT
1861         case FT_PACK:
1862                 usize = unpack(STDIN_FILENO, STDOUT_FILENO,
1863                                (char *)header1, sizeof header1, &gsize);
1864                 break;
1865 #endif
1866 #ifndef NO_XZ_SUPPORT
1867         case FT_XZ:
1868                 usize = unxz(STDIN_FILENO, STDOUT_FILENO,
1869                              (char *)header1, sizeof header1, &gsize);
1870                 break;
1871 #endif
1872         }
1873
1874 #ifndef SMALL
1875         if (vflag && !tflag && usize != -1 && gsize != -1)
1876                 print_verbage(NULL, NULL, usize, gsize);
1877         if (vflag && tflag)
1878                 print_test("(stdin)", usize != -1);
1879 #else
1880         (void)&usize;
1881 #endif
1882
1883 out:
1884         infile_clear();
1885 }
1886
1887 static void
1888 handle_stdout(void)
1889 {
1890         off_t gsize;
1891 #ifndef SMALL
1892         off_t usize;
1893         struct stat sb;
1894         time_t systime;
1895         uint32_t mtime;
1896         int ret;
1897
1898         infile_set("(stdout)", 0);
1899
1900         if (fflag == 0 && isatty(STDOUT_FILENO)) {
1901                 maybe_warnx("standard output is a terminal -- ignoring");
1902                 return;
1903         }
1904
1905         /* If stdin is a file use its mtime, otherwise use current time */
1906         ret = fstat(STDIN_FILENO, &sb);
1907         if (ret < 0) {
1908                 maybe_warn("Can't stat stdin");
1909                 return;
1910         }
1911
1912         if (S_ISREG(sb.st_mode)) {
1913                 infile_set("(stdout)", sb.st_size);
1914                 mtime = (uint32_t)sb.st_mtime;
1915         } else {
1916                 systime = time(NULL);
1917                 if (systime == -1) {
1918                         maybe_warn("time");
1919                         return;
1920                 }
1921                 mtime = (uint32_t)systime;
1922         }
1923
1924         usize =
1925 #endif
1926                 gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime);
1927 #ifndef SMALL
1928         if (vflag && !tflag && usize != -1 && gsize != -1)
1929                 print_verbage(NULL, NULL, usize, gsize);
1930 #endif
1931 }
1932
1933 /* do what is asked for, for the path name */
1934 static void
1935 handle_pathname(char *path)
1936 {
1937         char *opath = path, *s = NULL;
1938         ssize_t len;
1939         int slen;
1940         struct stat sb;
1941
1942         /* check for stdout/stdin */
1943         if (path[0] == '-' && path[1] == '\0') {
1944                 if (dflag)
1945                         handle_stdin();
1946                 else
1947                         handle_stdout();
1948                 return;
1949         }
1950
1951 retry:
1952         if (stat(path, &sb) != 0 || (fflag == 0 && cflag == 0 &&
1953             lstat(path, &sb) != 0)) {
1954                 /* lets try <path>.gz if we're decompressing */
1955                 if (dflag && s == NULL && errno == ENOENT) {
1956                         len = strlen(path);
1957                         slen = suffixes[0].ziplen;
1958                         s = malloc(len + slen + 1);
1959                         if (s == NULL)
1960                                 maybe_err("malloc");
1961                         memcpy(s, path, len);
1962                         memcpy(s + len, suffixes[0].zipped, slen + 1);
1963                         path = s;
1964                         goto retry;
1965                 }
1966                 maybe_warn("can't stat: %s", opath);
1967                 goto out;
1968         }
1969
1970         if (S_ISDIR(sb.st_mode)) {
1971 #ifndef SMALL
1972                 if (rflag)
1973                         handle_dir(path);
1974                 else
1975 #endif
1976                         maybe_warnx("%s is a directory", path);
1977                 goto out;
1978         }
1979
1980         if (S_ISREG(sb.st_mode))
1981                 handle_file(path, &sb);
1982         else
1983                 maybe_warnx("%s is not a regular file", path);
1984
1985 out:
1986         if (s)
1987                 free(s);
1988 }
1989
1990 /* compress/decompress a file */
1991 static void
1992 handle_file(char *file, struct stat *sbp)
1993 {
1994         off_t usize, gsize;
1995         char    outfile[PATH_MAX];
1996
1997         infile_set(file, sbp->st_size);
1998         if (dflag) {
1999                 usize = file_uncompress(file, outfile, sizeof(outfile));
2000 #ifndef SMALL
2001                 if (vflag && tflag)
2002                         print_test(file, usize != -1);
2003 #endif
2004                 if (usize == -1)
2005                         return;
2006                 gsize = sbp->st_size;
2007         } else {
2008                 gsize = file_compress(file, outfile, sizeof(outfile));
2009                 if (gsize == -1)
2010                         return;
2011                 usize = sbp->st_size;
2012         }
2013         infile_clear();
2014
2015 #ifndef SMALL
2016         if (vflag && !tflag)
2017                 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
2018 #endif
2019 }
2020
2021 #ifndef SMALL
2022 /* this is used with -r to recursively descend directories */
2023 static void
2024 handle_dir(char *dir)
2025 {
2026         char *path_argv[2];
2027         FTS *fts;
2028         FTSENT *entry;
2029
2030         path_argv[0] = dir;
2031         path_argv[1] = 0;
2032         fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
2033         if (fts == NULL) {
2034                 warn("couldn't fts_open %s", dir);
2035                 return;
2036         }
2037
2038         while ((entry = fts_read(fts))) {
2039                 switch(entry->fts_info) {
2040                 case FTS_D:
2041                 case FTS_DP:
2042                         continue;
2043
2044                 case FTS_DNR:
2045                 case FTS_ERR:
2046                 case FTS_NS:
2047                         maybe_warn("%s", entry->fts_path);
2048                         continue;
2049                 case FTS_F:
2050                         handle_file(entry->fts_path, entry->fts_statp);
2051                 }
2052         }
2053         (void)fts_close(fts);
2054 }
2055 #endif
2056
2057 /* print a ratio - size reduction as a fraction of uncompressed size */
2058 static void
2059 print_ratio(off_t in, off_t out, FILE *where)
2060 {
2061         int percent10;  /* 10 * percent */
2062         off_t diff;
2063         char buff[8];
2064         int len;
2065
2066         diff = in - out/2;
2067         if (in == 0 && out == 0)
2068                 percent10 = 0;
2069         else if (diff < 0)
2070                 /*
2071                  * Output is more than double size of input! print -99.9%
2072                  * Quite possibly we've failed to get the original size.
2073                  */
2074                 percent10 = -999;
2075         else {
2076                 /*
2077                  * We only need 12 bits of result from the final division,
2078                  * so reduce the values until a 32bit division will suffice.
2079                  */
2080                 while (in > 0x100000) {
2081                         diff >>= 1;
2082                         in >>= 1;
2083                 }
2084                 if (in != 0)
2085                         percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
2086                 else
2087                         percent10 = 0;
2088         }
2089
2090         len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
2091         /* Move the '.' to before the last digit */
2092         buff[len - 1] = buff[len - 2];
2093         buff[len - 2] = '.';
2094         fprintf(where, "%5s%%", buff);
2095 }
2096
2097 #ifndef SMALL
2098 /* print compression statistics, and the new name (if there is one!) */
2099 static void
2100 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
2101 {
2102         if (file)
2103                 fprintf(stderr, "%s:%s  ", file,
2104                     strlen(file) < 7 ? "\t\t" : "\t");
2105         print_ratio(usize, gsize, stderr);
2106         if (nfile)
2107                 fprintf(stderr, " -- replaced with %s", nfile);
2108         fprintf(stderr, "\n");
2109         fflush(stderr);
2110 }
2111
2112 /* print test results */
2113 static void
2114 print_test(const char *file, int ok)
2115 {
2116
2117         if (exit_value == 0 && ok == 0)
2118                 exit_value = 1;
2119         fprintf(stderr, "%s:%s  %s\n", file,
2120             strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
2121         fflush(stderr);
2122 }
2123 #endif
2124
2125 /* print a file's info ala --list */
2126 /* eg:
2127   compressed uncompressed  ratio uncompressed_name
2128       354841      1679360  78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
2129 */
2130 static void
2131 print_list(int fd, off_t out, const char *outfile, time_t ts)
2132 {
2133         static int first = 1;
2134 #ifndef SMALL
2135         static off_t in_tot, out_tot;
2136         uint32_t crc = 0;
2137 #endif
2138         off_t in = 0, rv;
2139
2140         if (first) {
2141 #ifndef SMALL
2142                 if (vflag)
2143                         printf("method  crc     date  time  ");
2144 #endif
2145                 if (qflag == 0)
2146                         printf("  compressed uncompressed  "
2147                                "ratio uncompressed_name\n");
2148         }
2149         first = 0;
2150
2151         /* print totals? */
2152 #ifndef SMALL
2153         if (fd == -1) {
2154                 in = in_tot;
2155                 out = out_tot;
2156         } else
2157 #endif
2158         {
2159                 /* read the last 4 bytes - this is the uncompressed size */
2160                 rv = lseek(fd, (off_t)(-8), SEEK_END);
2161                 if (rv != -1) {
2162                         unsigned char buf[8];
2163                         uint32_t usize;
2164
2165                         rv = read(fd, (char *)buf, sizeof(buf));
2166                         if (rv == -1)
2167                                 maybe_warn("read of uncompressed size");
2168                         else if (rv != sizeof(buf))
2169                                 maybe_warnx("read of uncompressed size");
2170
2171                         else {
2172                                 usize = buf[4] | buf[5] << 8 |
2173                                         buf[6] << 16 | buf[7] << 24;
2174                                 in = (off_t)usize;
2175 #ifndef SMALL
2176                                 crc = buf[0] | buf[1] << 8 |
2177                                       buf[2] << 16 | buf[3] << 24;
2178 #endif
2179                         }
2180                 }
2181         }
2182
2183 #ifndef SMALL
2184         if (vflag && fd == -1)
2185                 printf("                            ");
2186         else if (vflag) {
2187                 char *date = ctime(&ts);
2188
2189                 /* skip the day, 1/100th second, and year */
2190                 date += 4;
2191                 date[12] = 0;
2192                 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
2193         }
2194         in_tot += in;
2195         out_tot += out;
2196 #else
2197         (void)&ts;      /* XXX */
2198 #endif
2199         printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
2200         print_ratio(in, out, stdout);
2201         printf(" %s\n", outfile);
2202 }
2203
2204 /* display the usage of NetBSD gzip */
2205 static void
2206 usage(void)
2207 {
2208
2209         fprintf(stderr, "%s\n", gzip_version);
2210         fprintf(stderr,
2211 #ifdef SMALL
2212     "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n",
2213 #else
2214     "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n"
2215     " -1 --fast            fastest (worst) compression\n"
2216     " -2 .. -8             set compression level\n"
2217     " -9 --best            best (slowest) compression\n"
2218     " -c --stdout          write to stdout, keep original files\n"
2219     "    --to-stdout\n"
2220     " -d --decompress      uncompress files\n"
2221     "    --uncompress\n"
2222     " -f --force           force overwriting & compress links\n"
2223     " -h --help            display this help\n"
2224     " -k --keep            don't delete input files during operation\n"
2225     " -l --list            list compressed file contents\n"
2226     " -N --name            save or restore original file name and time stamp\n"
2227     " -n --no-name         don't save original file name or time stamp\n"
2228     " -q --quiet           output no warnings\n"
2229     " -r --recursive       recursively compress files in directories\n"
2230     " -S .suf              use suffix .suf instead of .gz\n"
2231     "    --suffix .suf\n"
2232     " -t --test            test compressed file\n"
2233     " -V --version         display program version\n"
2234     " -v --verbose         print extra statistics\n",
2235 #endif
2236             getprogname());
2237         exit(0);
2238 }
2239
2240 #ifndef SMALL
2241 /* display the license information of FreeBSD gzip */
2242 static void
2243 display_license(void)
2244 {
2245
2246         fprintf(stderr, "%s (based on NetBSD gzip 20150113)\n", gzip_version);
2247         fprintf(stderr, "%s\n", gzip_copyright);
2248         exit(0);
2249 }
2250 #endif
2251
2252 /* display the version of NetBSD gzip */
2253 static void
2254 display_version(void)
2255 {
2256
2257         fprintf(stderr, "%s\n", gzip_version);
2258         exit(0);
2259 }
2260
2261 #ifndef NO_BZIP2_SUPPORT
2262 #include "unbzip2.c"
2263 #endif
2264 #ifndef NO_COMPRESS_SUPPORT
2265 #include "zuncompress.c"
2266 #endif
2267 #ifndef NO_PACK_SUPPORT
2268 #include "unpack.c"
2269 #endif
2270 #ifndef NO_XZ_SUPPORT
2271 #include "unxz.c"
2272 #endif
2273
2274 static ssize_t
2275 read_retry(int fd, void *buf, size_t sz)
2276 {
2277         char *cp = buf;
2278         size_t left = MIN(sz, (size_t) SSIZE_MAX);
2279
2280         while (left > 0) {
2281                 ssize_t ret;
2282
2283                 ret = read(fd, cp, left);
2284                 if (ret == -1) {
2285                         return ret;
2286                 } else if (ret == 0) {
2287                         break; /* EOF */
2288                 }
2289                 cp += ret;
2290                 left -= ret;
2291         }
2292
2293         return sz - left;
2294 }
2295
2296 static ssize_t
2297 write_retry(int fd, const void *buf, size_t sz)
2298 {
2299         const char *cp = buf;
2300         size_t left = MIN(sz, (size_t) SSIZE_MAX);
2301
2302         while (left > 0) {
2303                 ssize_t ret;
2304
2305                 ret = write(fd, cp, left);
2306                 if (ret == -1) {
2307                         return ret;
2308                 } else if (ret == 0) {
2309                         abort();        /* Can't happen */
2310                 }
2311                 cp += ret;
2312                 left -= ret;
2313         }
2314
2315         return sz - left;
2316 }