usr.bin/gzip/gzip.c

   1 /*      $NetBSD: gzip.c,v 1.94 2009/04/12 10:31:14 lukem 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  * gzip.c -- GPL free gzip using zlib.
  31  *
  32  * RFC 1950 covers the zlib format
  33  * RFC 1951 covers the deflate format
  34  * RFC 1952 covers the gzip format
  35  *
  36  * TODO:
  37  *      - use mmap where possible
  38  *      - handle some signals better (remove outfile?)
  39  *      - make bzip2/compress -v/-t/-l support work as well as possible
  40  */
  41
  42 #include <sys/param.h>
  43 #include <sys/stat.h>
  44 #include <sys/time.h>
  45
  46 #include <err.h>
  47 #include <errno.h>
  48 #include <fcntl.h>
  49 #include <fts.h>
  50 #include <getopt.h>
  51 #include <inttypes.h>
  52 #include <libgen.h>
  53 #include <stdarg.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <time.h>
  58 #include <unistd.h>
  59 #include <zlib.h>
  60
  61 #ifndef PRIdOFF
  62 #define PRIdOFF PRId64
  63 #endif
  64
  65 #ifndef PRId64
  66 #define PRId64  "lld"
  67 #endif
  68
  69 /* what type of file are we dealing with */
  70 enum filetype {
  71         FT_GZIP,
  72 #ifndef NO_BZIP2_SUPPORT
  73         FT_BZIP2,
  74 #endif
  75 #ifndef NO_COMPRESS_SUPPORT
  76         FT_Z,
  77 #endif
  78 #ifndef NO_PACK_SUPPORT
  79         FT_PACK,
  80 #endif
  81         FT_LAST,
  82         FT_UNKNOWN
  83 };
  84
  85 #ifndef NO_BZIP2_SUPPORT
  86 #include <bzlib.h>
  87
  88 #define BZ2_SUFFIX      ".bz2"
  89 #define BZIP2_MAGIC     "\102\132\150"
  90 #endif
  91
  92 #ifndef NO_COMPRESS_SUPPORT
  93 #define Z_SUFFIX        ".Z"
  94 #define Z_MAGIC         "\037\235"
  95 #endif
  96
  97 #ifndef NO_PACK_SUPPORT
  98 #define PACK_MAGIC      "\037\036"
  99 #endif
 100
 101 #define GZ_SUFFIX       ".gz"
 102
 103 #define BUFLEN          (64 * 1024)
 104
 105 #define GZIP_MAGIC0     0x1F
 106 #define GZIP_MAGIC1     0x8B
 107 #define GZIP_OMAGIC1    0x9E
 108
 109 #define GZIP_TIMESTAMP  (off_t)4
 110 #define GZIP_ORIGNAME   (off_t)10
 111
 112 #define HEAD_CRC        0x02
 113 #define EXTRA_FIELD     0x04
 114 #define ORIG_NAME       0x08
 115 #define COMMENT         0x10
 116
 117 #define OS_CODE         3       /* Unix */
 118
 119 typedef struct {
 120     const char  *zipped;
 121     int         ziplen;
 122     const char  *normal;        /* for unzip - must not be longer than zipped */
 123 } suffixes_t;
 124 static suffixes_t suffixes[] = {
 125 #define SUFFIX(Z, N) {Z, sizeof Z - 1, N}
 126         SUFFIX(GZ_SUFFIX,       ""),    /* Overwritten by -S .xxx */
 127 #ifndef SMALL
 128         SUFFIX(GZ_SUFFIX,       ""),
 129         SUFFIX(".z",            ""),
 130         SUFFIX("-gz",           ""),
 131         SUFFIX("-z",            ""),
 132         SUFFIX("_z",            ""),
 133         SUFFIX(".taz",          ".tar"),
 134         SUFFIX(".tgz",          ".tar"),
 135 #ifndef NO_BZIP2_SUPPORT
 136         SUFFIX(BZ2_SUFFIX,      ""),
 137 #endif
 138 #ifndef NO_COMPRESS_SUPPORT
 139         SUFFIX(Z_SUFFIX,        ""),
 140 #endif
 141         SUFFIX(GZ_SUFFIX,       ""),    /* Overwritten by -S "" */
 142 #endif /* SMALL */
 143 #undef SUFFIX
 144 };
 145 #define NUM_SUFFIXES NELEM(suffixes)
 146
 147 #define SUFFIX_MAXLEN  30
 148
 149 static  const char      gzip_version[] = "NetBSD gzip 20060927";
 150
 151 static  int     cflag;                  /* stdout mode */
 152 static  int     dflag;                  /* decompress mode */
 153 static  int     lflag;                  /* list mode */
 154 static  int     numflag = 6;            /* gzip -1..-9 value */
 155
 156 #ifndef SMALL
 157 static  int     fflag;                  /* force mode */
 158 static  int     kflag;                  /* don't delete input files */
 159 static  int     nflag;                  /* don't save name/timestamp */
 160 static  int     Nflag;                  /* don't restore name/timestamp */
 161 static  int     qflag;                  /* quiet mode */
 162 static  int     rflag;                  /* recursive mode */
 163 static  int     tflag;                  /* test */
 164 static  int     vflag;                  /* verbose mode */
 165 #else
 166 #define         qflag   0
 167 #define         tflag   0
 168 #endif
 169
 170 static  int     exit_value = 0;         /* exit value */
 171
 172 static  char    *infile;                /* name of file coming in */
 173
 174 static  void    maybe_err(const char *fmt, ...)
 175     __attribute__((__format__(__printf__, 1, 2)));
 176 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT)
 177 static  void    maybe_errx(const char *fmt, ...)
 178     __attribute__((__format__(__printf__, 1, 2)));
 179 #endif
 180 static  void    maybe_warn(const char *fmt, ...)
 181     __attribute__((__format__(__printf__, 1, 2)));
 182 static  void    maybe_warnx(const char *fmt, ...)
 183     __attribute__((__format__(__printf__, 1, 2)));
 184 static  enum filetype file_gettype(u_char *);
 185 #ifdef SMALL
 186 #define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz)
 187 #endif
 188 static  off_t   gz_compress(int, int, off_t *, const char *, uint32_t);
 189 static  off_t   gz_uncompress(int, int, char *, size_t, off_t *, const char *);
 190 static  off_t   file_compress(char *, char *, size_t);
 191 static  off_t   file_uncompress(char *, char *, size_t);
 192 static  void    handle_pathname(char *);
 193 static  void    handle_file(char *, struct stat *);
 194 static  void    handle_stdin(void);
 195 static  void    handle_stdout(void);
 196 static  void    print_ratio(off_t, off_t, FILE *);
 197 static  void    print_list(int fd, off_t, const char *, time_t);
 198 static  void    usage(void) __dead2;
 199 static  void    display_version(void) __dead2;
 200 static  const suffixes_t *check_suffix(char *, int);
 201 static  ssize_t read_retry(int, void *, size_t);
 202
 203 #ifdef SMALL
 204 #define unlink_input(f, sb) unlink(f)
 205 #else
 206 static  off_t   cat_fd(unsigned char *, size_t, off_t *, int fd);
 207 static  void    prepend_gzip(char *, int *, char ***);
 208 static  void    handle_dir(char *);
 209 static  void    print_verbage(const char *, const char *, off_t, off_t);
 210 static  void    print_test(const char *, int);
 211 static  void    copymodes(int fd, const struct stat *, const char *file);
 212 static  int     check_outfile(const char *outfile);
 213 #endif
 214
 215 #ifndef NO_BZIP2_SUPPORT
 216 static  off_t   unbzip2(int, int, char *, size_t, off_t *);
 217 #endif
 218
 219 #ifndef NO_COMPRESS_SUPPORT
 220 static  FILE    *zdopen(int);
 221 static  off_t   zuncompress(FILE *, FILE *, char *, size_t, off_t *);
 222 #endif
 223
 224 #ifndef NO_PACK_SUPPORT
 225 static  off_t   unpack(int, int, char *, size_t, off_t *);
 226 #endif
 227
 228 #ifdef SMALL
 229 #define getopt_long(a,b,c,d,e) getopt(a,b,c)
 230 #else
 231 static const struct option longopts[] = {
 232         { "stdout",             no_argument,            0,      'c' },
 233         { "to-stdout",          no_argument,            0,      'c' },
 234         { "decompress",         no_argument,            0,      'd' },
 235         { "uncompress",         no_argument,            0,      'd' },
 236         { "force",              no_argument,            0,      'f' },
 237         { "help",               no_argument,            0,      'h' },
 238         { "keep",               no_argument,            0,      'k' },
 239         { "list",               no_argument,            0,      'l' },
 240         { "no-name",            no_argument,            0,      'n' },
 241         { "name",               no_argument,            0,      'N' },
 242         { "quiet",              no_argument,            0,      'q' },
 243         { "recursive",          no_argument,            0,      'r' },
 244         { "suffix",             required_argument,      0,      'S' },
 245         { "test",               no_argument,            0,      't' },
 246         { "verbose",            no_argument,            0,      'v' },
 247         { "version",            no_argument,            0,      'V' },
 248         { "fast",               no_argument,            0,      '1' },
 249         { "best",               no_argument,            0,      '9' },
 250 #if 0
 251         /*
 252          * This is what else GNU gzip implements.  --ascii isn't useful
 253          * on NetBSD, and I don't care to have a --license.
 254          */
 255         { "ascii",              no_argument,            0,      'a' },
 256         { "license",            no_argument,            0,      'L' },
 257 #endif
 258         { NULL,                 no_argument,            0,      0 },
 259 };
 260 #endif
 261
 262 int
 263 main(int argc, char **argv)
 264 {
 265         const char *progname = getprogname();
 266 #ifndef SMALL
 267         char *gzip;
 268         int len;
 269 #endif
 270         int ch;
 271
 272         /* XXX set up signals */
 273
 274 #ifndef SMALL
 275         if ((gzip = getenv("GZIP")) != NULL)
 276                 prepend_gzip(gzip, &argc, &argv);
 277 #endif
 278
 279         /*
 280          * XXX
 281          * handle being called `gunzip', `zcat' and `gzcat'
 282          */
 283         if (strcmp(progname, "gunzip") == 0)
 284                 dflag = 1;
 285         else if (strcmp(progname, "zcat") == 0 ||
 286                  strcmp(progname, "gzcat") == 0)
 287                 dflag = cflag = 1;
 288
 289 #ifdef SMALL
 290 #define OPT_LIST "123456789cdhltV"
 291 #else
 292 #define OPT_LIST "123456789cdfhklNnqrS:tVv"
 293 #endif
 294
 295         while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) {
 296                 switch (ch) {
 297                 case '1': case '2': case '3':
 298                 case '4': case '5': case '6':
 299                 case '7': case '8': case '9':
 300                         numflag = ch - '0';
 301                         break;
 302                 case 'c':
 303                         cflag = 1;
 304                         break;
 305                 case 'd':
 306                         dflag = 1;
 307                         break;
 308                 case 'l':
 309                         lflag = 1;
 310                         dflag = 1;
 311                         break;
 312                 case 'V':
 313                         display_version();
 314                         /* NOTREACHED */
 315 #ifndef SMALL
 316                 case 'f':
 317                         fflag = 1;
 318                         break;
 319                 case 'k':
 320                         kflag = 1;
 321                         break;
 322                 case 'N':
 323                         nflag = 0;
 324                         Nflag = 1;
 325                         break;
 326                 case 'n':
 327                         nflag = 1;
 328                         Nflag = 0;
 329                         break;
 330                 case 'q':
 331                         qflag = 1;
 332                         break;
 333                 case 'r':
 334                         rflag = 1;
 335                         break;
 336                 case 'S':
 337                         len = strlen(optarg);
 338                         if (len != 0) {
 339                                 if (len >= SUFFIX_MAXLEN)
 340                                         errx(1, "incorrect suffix: '%s'", optarg);
 341                                 suffixes[0].zipped = optarg;
 342                                 suffixes[0].ziplen = len;
 343                         } else {
 344                                 suffixes[NUM_SUFFIXES - 1].zipped = "";
 345                                 suffixes[NUM_SUFFIXES - 1].ziplen = 0;
 346                         }
 347                         break;
 348                 case 't':
 349                         cflag = 1;
 350                         tflag = 1;
 351                         dflag = 1;
 352                         break;
 353                 case 'v':
 354                         vflag = 1;
 355                         break;
 356 #endif
 357                 default:
 358                         usage();
 359                         /* NOTREACHED */
 360                 }
 361         }
 362         argv += optind;
 363         argc -= optind;
 364
 365         if (argc == 0) {
 366                 if (dflag)      /* stdin mode */
 367                         handle_stdin();
 368                 else            /* stdout mode */
 369                         handle_stdout();
 370         } else {
 371                 do {
 372                         handle_pathname(argv[0]);
 373                 } while (*++argv);
 374         }
 375 #ifndef SMALL
 376         if (qflag == 0 && lflag && argc > 1)
 377                 print_list(-1, 0, "(totals)", 0);
 378 #endif
 379         exit(exit_value);
 380 }
 381
 382 /* maybe print a warning */
 383 void
 384 maybe_warn(const char *fmt, ...)
 385 {
 386         va_list ap;
 387
 388         if (qflag == 0) {
 389                 va_start(ap, fmt);
 390                 vwarn(fmt, ap);
 391                 va_end(ap);
 392         }
 393         if (exit_value == 0)
 394                 exit_value = 1;
 395 }
 396
 397 /* ... without an errno. */
 398 void
 399 maybe_warnx(const char *fmt, ...)
 400 {
 401         va_list ap;
 402
 403         if (qflag == 0) {
 404                 va_start(ap, fmt);
 405                 vwarnx(fmt, ap);
 406                 va_end(ap);
 407         }
 408         if (exit_value == 0)
 409                 exit_value = 1;
 410 }
 411
 412 /* maybe print an error */
 413 void
 414 maybe_err(const char *fmt, ...)
 415 {
 416         va_list ap;
 417
 418         if (qflag == 0) {
 419                 va_start(ap, fmt);
 420                 vwarn(fmt, ap);
 421                 va_end(ap);
 422         }
 423         exit(2);
 424 }
 425
 426 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT)
 427 /* ... without an errno. */
 428 void
 429 maybe_errx(const char *fmt, ...)
 430 {
 431         va_list ap;
 432
 433         if (qflag == 0) {
 434                 va_start(ap, fmt);
 435                 vwarnx(fmt, ap);
 436                 va_end(ap);
 437         }
 438         exit(2);
 439 }
 440 #endif
 441
 442 #ifndef SMALL
 443 /* split up $GZIP and prepend it to the argument list */
 444 static void
 445 prepend_gzip(char *gzip, int *argc, char ***argv)
 446 {
 447         char *s, **nargv, **ac;
 448         int nenvarg = 0, i;
 449
 450         /* scan how many arguments there are */
 451         for (s = gzip;;) {
 452                 while (*s == ' ' || *s == '\t')
 453                         s++;
 454                 if (*s == 0)
 455                         goto count_done;
 456                 nenvarg++;
 457                 while (*s != ' ' && *s != '\t')
 458                         if (*s++ == 0)
 459                                 goto count_done;
 460         }
 461 count_done:
 462         /* punt early */
 463         if (nenvarg == 0)
 464                 return;
 465
 466         *argc += nenvarg;
 467         ac = *argv;
 468
 469         nargv = (char **)malloc((*argc + 1) * sizeof(char *));
 470         if (nargv == NULL)
 471                 maybe_err("malloc");
 472
 473         /* stash this away */
 474         *argv = nargv;
 475
 476         /* copy the program name first */
 477         i = 0;
 478         nargv[i++] = *(ac++);
 479
 480         /* take a copy of $GZIP and add it to the array */
 481         s = strdup(gzip);
 482         if (s == NULL)
 483                 maybe_err("strdup");
 484         for (;;) {
 485                 /* Skip whitespaces. */
 486                 while (*s == ' ' || *s == '\t')
 487                         s++;
 488                 if (*s == 0)
 489                         goto copy_done;
 490                 nargv[i++] = s;
 491                 /* Find the end of this argument. */
 492                 while (*s != ' ' && *s != '\t')
 493                         if (*s++ == 0)
 494                                 /* Argument followed by NUL. */
 495                                 goto copy_done;
 496                 /* Terminate by overwriting ' ' or '\t' with NUL. */
 497                 *s++ = 0;
 498         }
 499 copy_done:
 500
 501         /* copy the original arguments and a NULL */
 502         while (*ac)
 503                 nargv[i++] = *(ac++);
 504         nargv[i] = NULL;
 505 }
 506 #endif
 507
 508 /* compress input to output. Return bytes read, -1 on error */
 509 static off_t
 510 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime)
 511 {
 512         z_stream z;
 513         char *outbufp, *inbufp;
 514         off_t in_tot = 0, out_tot = 0;
 515         ssize_t in_size;
 516         int i, error;
 517         uLong crc;
 518 #ifdef SMALL
 519         static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0,
 520                                  0, 0, 0, 0,
 521                                  0, OS_CODE };
 522 #endif
 523
 524         outbufp = malloc(BUFLEN);
 525         inbufp = malloc(BUFLEN);
 526         if (outbufp == NULL || inbufp == NULL) {
 527                 maybe_err("malloc failed");
 528                 goto out;
 529         }
 530
 531         memset(&z, 0, sizeof z);
 532         z.zalloc = Z_NULL;
 533         z.zfree = Z_NULL;
 534         z.opaque = 0;
 535
 536 #ifdef SMALL
 537         memcpy(outbufp, header, sizeof header);
 538         i = sizeof header;
 539 #else
 540         if (nflag != 0) {
 541                 mtime = 0;
 542                 origname = "";
 543         }
 544
 545         i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s",
 546                      GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED,
 547                      *origname ? ORIG_NAME : 0,
 548                      mtime & 0xff,
 549                      (mtime >> 8) & 0xff,
 550                      (mtime >> 16) & 0xff,
 551                      (mtime >> 24) & 0xff,
 552                      numflag == 1 ? 4 : numflag == 9 ? 2 : 0,
 553                      OS_CODE, origname);
 554         if (i >= BUFLEN)
 555                 /* this need PATH_MAX > BUFLEN ... */
 556                 maybe_err("snprintf");
 557         if (*origname)
 558                 i++;
 559 #endif
 560
 561         z.next_out = outbufp + i;
 562         z.avail_out = BUFLEN - i;
 563
 564         error = deflateInit2(&z, numflag, Z_DEFLATED,
 565                              (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY);
 566         if (error != Z_OK) {
 567                 maybe_warnx("deflateInit2 failed");
 568                 in_tot = -1;
 569                 goto out;
 570         }
 571
 572         crc = crc32(0L, Z_NULL, 0);
 573         for (;;) {
 574                 if (z.avail_out == 0) {
 575                         if (write(out, outbufp, BUFLEN) != BUFLEN) {
 576                                 maybe_warn("write");
 577                                 out_tot = -1;
 578                                 goto out;
 579                         }
 580
 581                         out_tot += BUFLEN;
 582                         z.next_out = outbufp;
 583                         z.avail_out = BUFLEN;
 584                 }
 585
 586                 if (z.avail_in == 0) {
 587                         in_size = read(in, inbufp, BUFLEN);
 588                         if (in_size < 0) {
 589                                 maybe_warn("read");
 590                                 in_tot = -1;
 591                                 goto out;
 592                         }
 593                         if (in_size == 0)
 594                                 break;
 595
 596                         crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size);
 597                         in_tot += in_size;
 598                         z.next_in = inbufp;
 599                         z.avail_in = in_size;
 600                 }
 601
 602                 error = deflate(&z, Z_NO_FLUSH);
 603                 if (error != Z_OK && error != Z_STREAM_END) {
 604                         maybe_warnx("deflate failed");
 605                         in_tot = -1;
 606                         goto out;
 607                 }
 608         }
 609
 610         /* clean up */
 611         for (;;) {
 612                 size_t len;
 613                 ssize_t w;
 614
 615                 error = deflate(&z, Z_FINISH);
 616                 if (error != Z_OK && error != Z_STREAM_END) {
 617                         maybe_warnx("deflate failed");
 618                         in_tot = -1;
 619                         goto out;
 620                 }
 621
 622                 len = (char *)z.next_out - outbufp;
 623
 624                 w = write(out, outbufp, len);
 625                 if (w == -1 || (size_t)w != len) {
 626                         maybe_warn("write");
 627                         out_tot = -1;
 628                         goto out;
 629                 }
 630                 out_tot += len;
 631                 z.next_out = outbufp;
 632                 z.avail_out = BUFLEN;
 633
 634                 if (error == Z_STREAM_END)
 635                         break;
 636         }
 637
 638         if (deflateEnd(&z) != Z_OK) {
 639                 maybe_warnx("deflateEnd failed");
 640                 in_tot = -1;
 641                 goto out;
 642         }
 643
 644         i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c",
 645                  (int)crc & 0xff,
 646                  (int)(crc >> 8) & 0xff,
 647                  (int)(crc >> 16) & 0xff,
 648                  (int)(crc >> 24) & 0xff,
 649                  (int)in_tot & 0xff,
 650                  (int)(in_tot >> 8) & 0xff,
 651                  (int)(in_tot >> 16) & 0xff,
 652                  (int)(in_tot >> 24) & 0xff);
 653         if (i != 8)
 654                 maybe_err("snprintf");
 655 #if 0
 656         if (in_tot > 0xffffffff)
 657                 maybe_warn("input file size >= 4GB cannot be saved");
 658 #endif
 659         if (write(out, outbufp, i) != i) {
 660                 maybe_warn("write");
 661                 in_tot = -1;
 662         } else
 663                 out_tot += i;
 664
 665 out:
 666         if (inbufp != NULL)
 667                 free(inbufp);
 668         if (outbufp != NULL)
 669                 free(outbufp);
 670         if (gsizep)
 671                 *gsizep = out_tot;
 672         return in_tot;
 673 }
 674
 675 /*
 676  * uncompress input to output then close the input.  return the
 677  * uncompressed size written, and put the compressed sized read
 678  * into `*gsizep'.
 679  */
 680 static off_t
 681 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
 682               const char *filename)
 683 {
 684         z_stream z;
 685         char *outbufp, *inbufp;
 686         off_t out_tot = -1, in_tot = 0;
 687         uint32_t out_sub_tot = 0;
 688         enum {
 689                 GZSTATE_MAGIC0,
 690                 GZSTATE_MAGIC1,
 691                 GZSTATE_METHOD,
 692                 GZSTATE_FLAGS,
 693                 GZSTATE_SKIPPING,
 694                 GZSTATE_EXTRA,
 695                 GZSTATE_EXTRA2,
 696                 GZSTATE_EXTRA3,
 697                 GZSTATE_ORIGNAME,
 698                 GZSTATE_COMMENT,
 699                 GZSTATE_HEAD_CRC1,
 700                 GZSTATE_HEAD_CRC2,
 701                 GZSTATE_INIT,
 702                 GZSTATE_READ,
 703                 GZSTATE_CRC,
 704                 GZSTATE_LEN,
 705         } state = GZSTATE_MAGIC0;
 706         int flags = 0, skip_count = 0;
 707         int error = Z_STREAM_ERROR, done_reading = 0;
 708         uLong crc = 0;
 709         ssize_t wr;
 710         int needmore = 0;
 711
 712 #define ADVANCE()       { z.next_in++; z.avail_in--; }
 713
 714         if ((outbufp = malloc(BUFLEN)) == NULL) {
 715                 maybe_err("malloc failed");
 716                 goto out2;
 717         }
 718         if ((inbufp = malloc(BUFLEN)) == NULL) {
 719                 maybe_err("malloc failed");
 720                 goto out1;
 721         }
 722
 723         memset(&z, 0, sizeof z);
 724         z.avail_in = prelen;
 725         z.next_in = pre;
 726         z.avail_out = BUFLEN;
 727         z.next_out = outbufp;
 728         z.zalloc = NULL;
 729         z.zfree = NULL;
 730         z.opaque = 0;
 731
 732         in_tot = prelen;
 733         out_tot = 0;
 734
 735         for (;;) {
 736                 if ((z.avail_in == 0 || needmore) && done_reading == 0) {
 737                         ssize_t in_size;
 738
 739                         if (z.avail_in > 0) {
 740                                 memmove(inbufp, z.next_in, z.avail_in);
 741                         }
 742                         z.next_in = inbufp;
 743                         in_size = read(in, z.next_in + z.avail_in,
 744                             BUFLEN - z.avail_in);
 745
 746                         if (in_size == -1) {
 747                                 maybe_warn("failed to read stdin");
 748                                 goto stop_and_fail;
 749                         } else if (in_size == 0) {
 750                                 done_reading = 1;
 751                         }
 752
 753                         z.avail_in += in_size;
 754                         needmore = 0;
 755
 756                         in_tot += in_size;
 757                 }
 758                 if (z.avail_in == 0) {
 759                         if (done_reading && state != GZSTATE_MAGIC0) {
 760                                 maybe_warnx("%s: unexpected end of file",
 761                                             filename);
 762                                 goto stop_and_fail;
 763                         }
 764                         goto stop;
 765                 }
 766                 switch (state) {
 767                 case GZSTATE_MAGIC0:
 768                         if (*z.next_in != GZIP_MAGIC0) {
 769                                 if (in_tot > 0) {
 770                                         maybe_warnx("%s: trailing garbage "
 771                                                     "ignored", filename);
 772                                         goto stop;
 773                                 }
 774                                 maybe_warnx("input not gziped (MAGIC0)");
 775                                 goto stop_and_fail;
 776                         }
 777                         ADVANCE();
 778                         state++;
 779                         out_sub_tot = 0;
 780                         crc = crc32(0L, Z_NULL, 0);
 781                         break;
 782
 783                 case GZSTATE_MAGIC1:
 784                         if (*z.next_in != GZIP_MAGIC1 &&
 785                             *z.next_in != GZIP_OMAGIC1) {
 786                                 maybe_warnx("input not gziped (MAGIC1)");
 787                                 goto stop_and_fail;
 788                         }
 789                         ADVANCE();
 790                         state++;
 791                         break;
 792
 793                 case GZSTATE_METHOD:
 794                         if (*z.next_in != Z_DEFLATED) {
 795                                 maybe_warnx("unknown compression method");
 796                                 goto stop_and_fail;
 797                         }
 798                         ADVANCE();
 799                         state++;
 800                         break;
 801
 802                 case GZSTATE_FLAGS:
 803                         flags = *z.next_in;
 804                         ADVANCE();
 805                         skip_count = 6;
 806                         state++;
 807                         break;
 808
 809                 case GZSTATE_SKIPPING:
 810                         if (skip_count > 0) {
 811                                 skip_count--;
 812                                 ADVANCE();
 813                         } else
 814                                 state++;
 815                         break;
 816
 817                 case GZSTATE_EXTRA:
 818                         if ((flags & EXTRA_FIELD) == 0) {
 819                                 state = GZSTATE_ORIGNAME;
 820                                 break;
 821                         }
 822                         skip_count = *z.next_in;
 823                         ADVANCE();
 824                         state++;
 825                         break;
 826
 827                 case GZSTATE_EXTRA2:
 828                         skip_count |= ((*z.next_in) << 8);
 829                         ADVANCE();
 830                         state++;
 831                         break;
 832
 833                 case GZSTATE_EXTRA3:
 834                         if (skip_count > 0) {
 835                                 skip_count--;
 836                                 ADVANCE();
 837                         } else
 838                                 state++;
 839                         break;
 840
 841                 case GZSTATE_ORIGNAME:
 842                         if ((flags & ORIG_NAME) == 0) {
 843                                 state++;
 844                                 break;
 845                         }
 846                         if (*z.next_in == 0)
 847                                 state++;
 848                         ADVANCE();
 849                         break;
 850
 851                 case GZSTATE_COMMENT:
 852                         if ((flags & COMMENT) == 0) {
 853                                 state++;
 854                                 break;
 855                         }
 856                         if (*z.next_in == 0)
 857                                 state++;
 858                         ADVANCE();
 859                         break;
 860
 861                 case GZSTATE_HEAD_CRC1:
 862                         if (flags & HEAD_CRC)
 863                                 skip_count = 2;
 864                         else
 865                                 skip_count = 0;
 866                         state++;
 867                         break;
 868
 869                 case GZSTATE_HEAD_CRC2:
 870                         if (skip_count > 0) {
 871                                 skip_count--;
 872                                 ADVANCE();
 873                         } else
 874                                 state++;
 875                         break;
 876
 877                 case GZSTATE_INIT:
 878                         if (inflateInit2(&z, -MAX_WBITS) != Z_OK) {
 879                                 maybe_warnx("failed to inflateInit");
 880                                 goto stop_and_fail;
 881                         }
 882                         state++;
 883                         break;
 884
 885                 case GZSTATE_READ:
 886                         error = inflate(&z, Z_FINISH);
 887                         switch (error) {
 888                         /* Z_BUF_ERROR goes with Z_FINISH... */
 889                         case Z_BUF_ERROR:
 890                                 if (z.avail_out > 0 && !done_reading)
 891                                         continue;
 892                         case Z_STREAM_END:
 893                         case Z_OK:
 894                                 break;
 895
 896                         case Z_NEED_DICT:
 897                                 maybe_warnx("Z_NEED_DICT error");
 898                                 goto stop_and_fail;
 899                         case Z_DATA_ERROR:
 900                                 maybe_warnx("data stream error");
 901                                 goto stop_and_fail;
 902                         case Z_STREAM_ERROR:
 903                                 maybe_warnx("internal stream error");
 904                                 goto stop_and_fail;
 905                         case Z_MEM_ERROR:
 906                                 maybe_warnx("memory allocation error");
 907                                 goto stop_and_fail;
 908
 909                         default:
 910                                 maybe_warn("unknown error from inflate(): %d",
 911                                     error);
 912                         }
 913                         wr = BUFLEN - z.avail_out;
 914
 915                         if (wr != 0) {
 916                                 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr);
 917                                 if (
 918 #ifndef SMALL
 919                                     /* don't write anything with -t */
 920                                     tflag == 0 &&
 921 #endif
 922                                     write(out, outbufp, wr) != wr) {
 923                                         maybe_warn("error writing to output");
 924                                         goto stop_and_fail;
 925                                 }
 926
 927                                 out_tot += wr;
 928                                 out_sub_tot += wr;
 929                         }
 930
 931                         if (error == Z_STREAM_END) {
 932                                 inflateEnd(&z);
 933                                 state++;
 934                         }
 935
 936                         z.next_out = outbufp;
 937                         z.avail_out = BUFLEN;
 938
 939                         break;
 940                 case GZSTATE_CRC:
 941                         {
 942                                 uLong origcrc;
 943
 944                                 if (z.avail_in < 4) {
 945                                         if (!done_reading) {
 946                                                 needmore = 1;
 947                                                 continue;
 948                                         }
 949                                         maybe_warnx("truncated input");
 950                                         goto stop_and_fail;
 951                                 }
 952                                 origcrc = ((unsigned)z.next_in[0] & 0xff) |
 953                                         ((unsigned)z.next_in[1] & 0xff) << 8 |
 954                                         ((unsigned)z.next_in[2] & 0xff) << 16 |
 955                                         ((unsigned)z.next_in[3] & 0xff) << 24;
 956                                 if (origcrc != crc) {
 957                                         maybe_warnx("invalid compressed"
 958                                              " data--crc error");
 959                                         goto stop_and_fail;
 960                                 }
 961                         }
 962
 963                         z.avail_in -= 4;
 964                         z.next_in += 4;
 965
 966                         if (!z.avail_in && done_reading) {
 967                                 goto stop;
 968                         }
 969                         state++;
 970                         break;
 971                 case GZSTATE_LEN:
 972                         {
 973                                 uLong origlen;
 974
 975                                 if (z.avail_in < 4) {
 976                                         if (!done_reading) {
 977                                                 needmore = 1;
 978                                                 continue;
 979                                         }
 980                                         maybe_warnx("truncated input");
 981                                         goto stop_and_fail;
 982                                 }
 983                                 origlen = ((unsigned)z.next_in[0] & 0xff) |
 984                                         ((unsigned)z.next_in[1] & 0xff) << 8 |
 985                                         ((unsigned)z.next_in[2] & 0xff) << 16 |
 986                                         ((unsigned)z.next_in[3] & 0xff) << 24;
 987
 988                                 if (origlen != out_sub_tot) {
 989                                         maybe_warnx("invalid compressed"
 990                                              " data--length error");
 991                                         goto stop_and_fail;
 992                                 }
 993                         }
 994
 995                         z.avail_in -= 4;
 996                         z.next_in += 4;
 997
 998                         if (error < 0) {
 999                                 maybe_warnx("decompression error");
1000                                 goto stop_and_fail;
1001                         }
1002                         state = GZSTATE_MAGIC0;
1003                         break;
1004                 }
1005                 continue;
1006 stop_and_fail:
1007                 out_tot = -1;
1008 stop:
1009                 break;
1010         }
1011         if (state > GZSTATE_INIT)
1012                 inflateEnd(&z);
1013
1014         free(inbufp);
1015 out1:
1016         free(outbufp);
1017 out2:
1018         if (gsizep)
1019                 *gsizep = in_tot;
1020         return (out_tot);
1021 }
1022
1023 #ifndef SMALL
1024 /*
1025  * set the owner, mode, flags & utimes using the given file descriptor.
1026  * file is only used in possible warning messages.
1027  */
1028 static void
1029 copymodes(int fd, const struct stat *sbp, const char *file)
1030 {
1031         struct timeval times[2];
1032         struct stat sb;
1033
1034         /*
1035          * If we have no info on the input, give this file some
1036          * default values and return..
1037          */
1038         if (sbp == NULL) {
1039                 mode_t mask = umask(022);
1040
1041                 (void)fchmod(fd, DEFFILEMODE & ~mask);
1042                 (void)umask(mask);
1043                 return;
1044         }
1045         sb = *sbp;
1046
1047         /* if the chown fails, remove set-id bits as-per compress(1) */
1048         if (fchown(fd, sb.st_uid, sb.st_gid) < 0) {
1049                 if (errno != EPERM)
1050                         maybe_warn("couldn't fchown: %s", file);
1051                 sb.st_mode &= ~(S_ISUID|S_ISGID);
1052         }
1053
1054         /* we only allow set-id and the 9 normal permission bits */
1055         sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
1056         if (fchmod(fd, sb.st_mode) < 0)
1057                 maybe_warn("couldn't fchmod: %s", file);
1058
1059         /* only try flags if they exist already */
1060 #ifdef _ST_FLAGS_PRESENT_
1061         if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0)
1062                 maybe_warn("couldn't fchflags: %s", file);
1063 #endif
1064
1065         TIMESPEC_TO_TIMEVAL(&times[0], &sb.st_atimespec);
1066         TIMESPEC_TO_TIMEVAL(&times[1], &sb.st_mtimespec);
1067         if (futimes(fd, times) < 0)
1068                 maybe_warn("couldn't utimes: %s", file);
1069 }
1070 #endif
1071
1072 /* what sort of file is this? */
1073 static enum filetype
1074 file_gettype(u_char *buf)
1075 {
1076
1077         if (buf[0] == GZIP_MAGIC0 &&
1078             (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
1079                 return FT_GZIP;
1080         else
1081 #ifndef NO_BZIP2_SUPPORT
1082         if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
1083             buf[3] >= '0' && buf[3] <= '9')
1084                 return FT_BZIP2;
1085         else
1086 #endif
1087 #ifndef NO_COMPRESS_SUPPORT
1088         if (memcmp(buf, Z_MAGIC, 2) == 0)
1089                 return FT_Z;
1090         else
1091 #endif
1092 #ifndef NO_PACK_SUPPORT
1093         if (memcmp(buf, PACK_MAGIC, 2) == 0)
1094                 return FT_PACK;
1095         else
1096 #endif
1097                 return FT_UNKNOWN;
1098 }
1099
1100 #ifndef SMALL
1101 /* check the outfile is OK. */
1102 static int
1103 check_outfile(const char *outfile)
1104 {
1105         struct stat sb;
1106         int ok = 1;
1107
1108         if (lflag == 0 && stat(outfile, &sb) == 0) {
1109                 if (fflag)
1110                         unlink(outfile);
1111                 else if (isatty(STDIN_FILENO)) {
1112                         char ans[10] = { 'n', '\0' };   /* default */
1113
1114                         fprintf(stderr, "%s already exists -- do you wish to "
1115                                         "overwrite (y or n)? " , outfile);
1116                         (void)fgets(ans, sizeof(ans) - 1, stdin);
1117                         if (ans[0] != 'y' && ans[0] != 'Y') {
1118                                 fprintf(stderr, "\tnot overwriting\n");
1119                                 ok = 0;
1120                         } else
1121                                 unlink(outfile);
1122                 } else {
1123                         maybe_warnx("%s already exists -- skipping", outfile);
1124                         ok = 0;
1125                 }
1126         }
1127         return ok;
1128 }
1129
1130 static void
1131 unlink_input(const char *file, const struct stat *sb)
1132 {
1133         struct stat nsb;
1134
1135         if (kflag)
1136                 return;
1137         if (stat(file, &nsb) != 0)
1138                 /* Must be gone alrady */
1139                 return;
1140         if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
1141                 /* Definitely a different file */
1142                 return;
1143         unlink(file);
1144 }
1145 #endif
1146
1147 static const suffixes_t *
1148 check_suffix(char *file, int xlate)
1149 {
1150         const suffixes_t *s;
1151         int len = strlen(file);
1152         char *sp;
1153
1154         for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
1155                 /* if it doesn't fit in "a.suf", don't bother */
1156                 if (s->ziplen >= len)
1157                         continue;
1158                 sp = file + len - s->ziplen;
1159                 if (strcmp(s->zipped, sp) != 0)
1160                         continue;
1161                 if (xlate)
1162                         strcpy(sp, s->normal);
1163                 return s;
1164         }
1165         return NULL;
1166 }
1167
1168 /*
1169  * compress the given file: create a corresponding .gz file and remove the
1170  * original.
1171  */
1172 static off_t
1173 file_compress(char *file, char *outfile, size_t outsize)
1174 {
1175         int in;
1176         int out;
1177         off_t size, insize;
1178 #ifndef SMALL
1179         struct stat isb, osb;
1180         const suffixes_t *suff;
1181 #endif
1182
1183         in = open(file, O_RDONLY);
1184         if (in == -1) {
1185                 maybe_warn("can't open %s", file);
1186                 return -1;
1187         }
1188
1189         if (cflag == 0) {
1190 #ifndef SMALL
1191                 if (fstat(in, &isb) == 0) {
1192                         if (isb.st_nlink > 1 && fflag == 0) {
1193                                 maybe_warnx("%s has %d other link%s -- "
1194                                             "skipping", file, isb.st_nlink - 1,
1195                                             isb.st_nlink == 1 ? "" : "s");
1196                                 close(in);
1197                                 return -1;
1198                         }
1199                 }
1200
1201                 if (fflag == 0 && (suff = check_suffix(file, 0))
1202                     && suff->zipped[0] != 0) {
1203                         maybe_warnx("%s already has %s suffix -- unchanged",
1204                                     file, suff->zipped);
1205                         close(in);
1206                         return -1;
1207                 }
1208 #endif
1209
1210                 /* Add (usually) .gz to filename */
1211                 if ((size_t)snprintf(outfile, outsize, "%s%s",
1212                                      file, suffixes[0].zipped) >= outsize) {
1213                         errx(1, "file path too long: %s", file);
1214                 }
1215 #ifndef SMALL
1216                 if (check_outfile(outfile) == 0) {
1217                         close(in);
1218                         return -1;
1219                 }
1220 #endif
1221         }
1222
1223         if (cflag == 0) {
1224                 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
1225                 if (out == -1) {
1226                         maybe_warn("could not create output: %s", outfile);
1227                         fclose(stdin);
1228                         return -1;
1229                 }
1230         } else
1231                 out = STDOUT_FILENO;
1232
1233         insize = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
1234
1235         (void)close(in);
1236
1237         /*
1238          * If there was an error, insize will be -1.
1239          * If we compressed to stdout, just return the size.
1240          * Otherwise stat the file and check it is the correct size.
1241          * We only blow away the file if we can stat the output and it
1242          * has the expected size.
1243          */
1244         if (cflag != 0)
1245                 return insize == -1 ? -1 : size;
1246
1247 #ifndef SMALL
1248         if (fstat(out, &osb) != 0) {
1249                 maybe_warn("couldn't stat: %s", outfile);
1250                 goto bad_outfile;
1251         }
1252
1253         if (osb.st_size != size) {
1254                 maybe_warnx("output file: %s wrong size (%" PRIdOFF
1255                                 " != %" PRIdOFF "), deleting",
1256                                 outfile, osb.st_size, size);
1257                 goto bad_outfile;
1258         }
1259
1260         copymodes(out, &isb, outfile);
1261 #endif
1262         if (close(out) == -1)
1263                 maybe_warn("couldn't close output");
1264
1265         /* output is good, ok to delete input */
1266         unlink_input(file, &isb);
1267         return size;
1268
1269 #ifndef SMALL
1270     bad_outfile:
1271         if (close(out) == -1)
1272                 maybe_warn("couldn't close output");
1273
1274         maybe_warnx("leaving original %s", file);
1275         unlink(outfile);
1276         return size;
1277 #endif
1278 }
1279
1280 /* uncompress the given file and remove the original */
1281 static off_t
1282 file_uncompress(char *file, char *outfile, size_t outsize)
1283 {
1284         struct stat isb, osb;
1285         off_t size;
1286         ssize_t rbytes;
1287         unsigned char header1[4];
1288         enum filetype method;
1289         int fd, ofd, zfd = -1;
1290 #ifndef SMALL
1291         ssize_t rv;
1292         time_t timestamp = 0;
1293         unsigned char name[PATH_MAX + 1];
1294 #endif
1295
1296         /* gather the old name info */
1297
1298         fd = open(file, O_RDONLY);
1299         if (fd < 0) {
1300                 maybe_warn("can't open %s", file);
1301                 goto lose;
1302         }
1303
1304         if ((size_t)snprintf(outfile, outsize, "%s", file) >= outsize)
1305                 errx(1, "file path too long: %s", file);
1306         if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
1307                 maybe_warnx("%s: unknown suffix -- ignored", file);
1308                 goto lose;
1309         }
1310
1311         rbytes = read(fd, header1, sizeof header1);
1312         if (rbytes != sizeof header1) {
1313                 /* we don't want to fail here. */
1314 #ifndef SMALL
1315                 if (fflag)
1316                         goto lose;
1317 #endif
1318                 if (rbytes == -1)
1319                         maybe_warn("can't read %s", file);
1320                 else
1321                         goto unexpected_EOF;
1322                 goto lose;
1323         }
1324
1325         method = file_gettype(header1);
1326
1327 #ifndef SMALL
1328         if (fflag == 0 && method == FT_UNKNOWN) {
1329                 maybe_warnx("%s: not in gzip format", file);
1330                 goto lose;
1331         }
1332
1333 #endif
1334
1335 #ifndef SMALL
1336         if (method == FT_GZIP && Nflag) {
1337                 unsigned char ts[4];    /* timestamp */
1338
1339                 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP);
1340                 if (rv >= 0 && rv < (ssize_t)(sizeof ts))
1341                         goto unexpected_EOF;
1342                 if (rv == -1) {
1343                         if (!fflag)
1344                                 maybe_warn("can't read %s", file);
1345                         goto lose;
1346                 }
1347                 timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0];
1348
1349                 if (header1[3] & ORIG_NAME) {
1350                         rbytes = pread(fd, name, sizeof name, GZIP_ORIGNAME);
1351                         if (rbytes < 0) {
1352                                 maybe_warn("can't read %s", file);
1353                                 goto lose;
1354                         }
1355                         if (name[0] != 0) {
1356                                 /* preserve original directory name */
1357                                 char *dp = strrchr(file, '/');
1358                                 if (dp == NULL)
1359                                         dp = file;
1360                                 else
1361                                         dp++;
1362                                 snprintf(outfile, outsize, "%.*s%.*s",
1363                                                 (int) (dp - file),
1364                                                 file, (int) rbytes, name);
1365                         }
1366                 }
1367         }
1368 #endif
1369         lseek(fd, 0, SEEK_SET);
1370
1371         if (cflag == 0 || lflag) {
1372                 if (fstat(fd, &isb) != 0)
1373                         goto lose;
1374 #ifndef SMALL
1375                 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
1376                         maybe_warnx("%s has %d other links -- skipping",
1377                             file, isb.st_nlink - 1);
1378                         goto lose;
1379                 }
1380                 if (nflag == 0 && timestamp)
1381                         isb.st_mtime = timestamp;
1382                 if (check_outfile(outfile) == 0)
1383                         goto lose;
1384 #endif
1385         }
1386
1387         if (cflag == 0 && lflag == 0) {
1388                 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
1389                 if (zfd == STDOUT_FILENO) {
1390                         /* We won't close STDOUT_FILENO later... */
1391                         zfd = dup(zfd);
1392                         close(STDOUT_FILENO);
1393                 }
1394                 if (zfd == -1) {
1395                         maybe_warn("can't open %s", outfile);
1396                         goto lose;
1397                 }
1398         } else
1399                 zfd = STDOUT_FILENO;
1400
1401 #ifndef NO_BZIP2_SUPPORT
1402         if (method == FT_BZIP2) {
1403
1404                 /* XXX */
1405                 if (lflag) {
1406                         maybe_warnx("no -l with bzip2 files");
1407                         goto lose;
1408                 }
1409
1410                 size = unbzip2(fd, zfd, NULL, 0, NULL);
1411         } else
1412 #endif
1413
1414 #ifndef NO_COMPRESS_SUPPORT
1415         if (method == FT_Z) {
1416                 FILE *in, *out;
1417
1418                 /* XXX */
1419                 if (lflag) {
1420                         maybe_warnx("no -l with Lempel-Ziv files");
1421                         goto lose;
1422                 }
1423
1424                 if ((in = zdopen(fd)) == NULL) {
1425                         maybe_warn("zdopen for read: %s", file);
1426                         goto lose;
1427                 }
1428
1429                 out = fdopen(dup(zfd), "w");
1430                 if (out == NULL) {
1431                         maybe_warn("fdopen for write: %s", outfile);
1432                         fclose(in);
1433                         goto lose;
1434                 }
1435
1436                 size = zuncompress(in, out, NULL, 0, NULL);
1437                 /* need to fclose() if ferror() is true... */
1438                 if (ferror(in) | fclose(in)) {
1439                         maybe_warn("failed infile fclose");
1440                         unlink(outfile);
1441                         (void)fclose(out);
1442                 }
1443                 if (fclose(out) != 0) {
1444                         maybe_warn("failed outfile fclose");
1445                         unlink(outfile);
1446                         goto lose;
1447                 }
1448         } else
1449 #endif
1450
1451 #ifndef NO_PACK_SUPPORT
1452         if (method == FT_PACK) {
1453                 if (lflag) {
1454                         maybe_warnx("no -l with packed files");
1455                         goto lose;
1456                 }
1457
1458                 size = unpack(fd, zfd, NULL, 0, NULL);
1459         } else
1460 #endif
1461
1462 #ifndef SMALL
1463         if (method == FT_UNKNOWN) {
1464                 if (lflag) {
1465                         maybe_warnx("no -l for unknown filetypes");
1466                         goto lose;
1467                 }
1468                 size = cat_fd(NULL, 0, NULL, fd);
1469         } else
1470 #endif
1471         {
1472                 if (lflag) {
1473                         print_list(fd, isb.st_size, outfile, isb.st_mtime);
1474                         close(fd);
1475                         return -1;      /* XXX */
1476                 }
1477
1478                 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
1479         }
1480
1481         if (close(fd) != 0)
1482                 maybe_warn("couldn't close input");
1483         if (zfd != STDOUT_FILENO && close(zfd) != 0)
1484                 maybe_warn("couldn't close output");
1485
1486         if (size == -1) {
1487                 if (cflag == 0)
1488                         unlink(outfile);
1489                 maybe_warnx("%s: uncompress failed", file);
1490                 return -1;
1491         }
1492
1493         /* if testing, or we uncompressed to stdout, this is all we need */
1494 #ifndef SMALL
1495         if (tflag)
1496                 return size;
1497 #endif
1498         /* if we are uncompressing to stdin, don't remove the file. */
1499         if (cflag)
1500                 return size;
1501
1502         /*
1503          * if we create a file...
1504          */
1505         /*
1506          * if we can't stat the file don't remove the file.
1507          */
1508
1509         ofd = open(outfile, O_RDWR, 0);
1510         if (ofd == -1) {
1511                 maybe_warn("couldn't open (leaving original): %s",
1512                            outfile);
1513                 return -1;
1514         }
1515         if (fstat(ofd, &osb) != 0) {
1516                 maybe_warn("couldn't stat (leaving original): %s",
1517                            outfile);
1518                 close(ofd);
1519                 return -1;
1520         }
1521         if (osb.st_size != size) {
1522                 maybe_warnx("stat gave different size: %" PRIdOFF
1523                                 " != %" PRIdOFF " (leaving original)",
1524                                 size, osb.st_size);
1525                 close(ofd);
1526                 unlink(outfile);
1527                 return -1;
1528         }
1529         unlink_input(file, &isb);
1530 #ifndef SMALL
1531         copymodes(ofd, &isb, outfile);
1532 #endif
1533         close(ofd);
1534         return size;
1535
1536     unexpected_EOF:
1537         maybe_warnx("%s: unexpected end of file", file);
1538     lose:
1539         if (fd != -1)
1540                 close(fd);
1541         if (zfd != -1 && zfd != STDOUT_FILENO)
1542                 close(fd);
1543         return -1;
1544 }
1545
1546 #ifndef SMALL
1547 static off_t
1548 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd)
1549 {
1550         char buf[BUFLEN];
1551         off_t in_tot;
1552         ssize_t w;
1553
1554         in_tot = count;
1555         w = write(STDOUT_FILENO, prepend, count);
1556         if (w == -1 || (size_t)w != count) {
1557                 maybe_warn("write to stdout");
1558                 return -1;
1559         }
1560         for (;;) {
1561                 ssize_t rv;
1562
1563                 rv = read(fd, buf, sizeof buf);
1564                 if (rv == 0)
1565                         break;
1566                 if (rv < 0) {
1567                         maybe_warn("read from fd %d", fd);
1568                         break;
1569                 }
1570
1571                 if (write(STDOUT_FILENO, buf, rv) != rv) {
1572                         maybe_warn("write to stdout");
1573                         break;
1574                 }
1575                 in_tot += rv;
1576         }
1577
1578         if (gsizep)
1579                 *gsizep = in_tot;
1580         return (in_tot);
1581 }
1582 #endif
1583
1584 static void
1585 handle_stdin(void)
1586 {
1587         unsigned char header1[4];
1588         off_t usize, gsize;
1589         enum filetype method;
1590         ssize_t bytes_read;
1591 #ifndef NO_COMPRESS_SUPPORT
1592         FILE *in;
1593 #endif
1594
1595 #ifndef SMALL
1596         if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
1597                 maybe_warnx("standard input is a terminal -- ignoring");
1598                 return;
1599         }
1600 #endif
1601
1602         if (lflag) {
1603                 struct stat isb;
1604
1605                 /* XXX could read the whole file, etc. */
1606                 if (fstat(STDIN_FILENO, &isb) < 0) {
1607                         maybe_warn("fstat");
1608                         return;
1609                 }
1610                 print_list(STDIN_FILENO, isb.st_size, "stdout", isb.st_mtime);
1611                 return;
1612         }
1613
1614         bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1);
1615         if (bytes_read == -1) {
1616                 maybe_warn("can't read stdin");
1617                 return;
1618         } else if (bytes_read != sizeof(header1)) {
1619                 maybe_warnx("(stdin): unexpected end of file");
1620                 return;
1621         }
1622
1623         method = file_gettype(header1);
1624         switch (method) {
1625         default:
1626 #ifndef SMALL
1627                 if (fflag == 0) {
1628                         maybe_warnx("unknown compression format");
1629                         return;
1630                 }
1631                 usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO);
1632                 break;
1633 #endif
1634         case FT_GZIP:
1635                 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
1636                               header1, sizeof header1, &gsize, "(stdin)");
1637                 break;
1638 #ifndef NO_BZIP2_SUPPORT
1639         case FT_BZIP2:
1640                 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
1641                                 header1, sizeof header1, &gsize);
1642                 break;
1643 #endif
1644 #ifndef NO_COMPRESS_SUPPORT
1645         case FT_Z:
1646                 if ((in = zdopen(STDIN_FILENO)) == NULL) {
1647                         maybe_warnx("zopen of stdin");
1648                         return;
1649                 }
1650
1651                 usize = zuncompress(in, stdout, header1, sizeof header1, &gsize);
1652                 fclose(in);
1653                 break;
1654 #endif
1655 #ifndef NO_PACK_SUPPORT
1656         case FT_PACK:
1657                 usize = unpack(STDIN_FILENO, STDOUT_FILENO,
1658                                (char *)header1, sizeof header1, &gsize);
1659                 break;
1660 #endif
1661         }
1662
1663 #ifndef SMALL
1664         if (vflag && !tflag && usize != -1 && gsize != -1)
1665                 print_verbage(NULL, NULL, usize, gsize);
1666         if (vflag && tflag)
1667                 print_test("(stdin)", usize != -1);
1668 #endif
1669
1670 }
1671
1672 static void
1673 handle_stdout(void)
1674 {
1675         off_t gsize, usize;
1676         struct stat sb;
1677         time_t systime;
1678         uint32_t mtime;
1679         int ret;
1680
1681 #ifndef SMALL
1682         if (fflag == 0 && isatty(STDOUT_FILENO)) {
1683                 maybe_warnx("standard output is a terminal -- ignoring");
1684                 return;
1685         }
1686 #endif
1687         /* If stdin is a file use it's mtime, otherwise use current time */
1688         ret = fstat(STDIN_FILENO, &sb);
1689
1690 #ifndef SMALL
1691         if (ret < 0) {
1692                 maybe_warn("Can't stat stdin");
1693                 return;
1694         }
1695 #endif
1696
1697         if (S_ISREG(sb.st_mode))
1698                 mtime = (uint32_t)sb.st_mtime;
1699         else {
1700                 systime = time(NULL);
1701 #ifndef SMALL
1702                 if (systime == -1) {
1703                         maybe_warn("time");
1704                         return;
1705                 }
1706 #endif
1707                 mtime = (uint32_t)systime;
1708         }
1709
1710         usize = gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime);
1711 #ifndef SMALL
1712         if (vflag && !tflag && usize != -1 && gsize != -1)
1713                 print_verbage(NULL, NULL, usize, gsize);
1714 #endif
1715 }
1716
1717 /* do what is asked for, for the path name */
1718 static void
1719 handle_pathname(char *path)
1720 {
1721         char *opath = path, *s = NULL;
1722         ssize_t len;
1723         int slen;
1724         struct stat sb;
1725
1726         /* check for stdout/stdin */
1727         if (path[0] == '-' && path[1] == '\0') {
1728                 if (dflag)
1729                         handle_stdin();
1730                 else
1731                         handle_stdout();
1732                 return;
1733         }
1734
1735 retry:
1736         if (stat(path, &sb) != 0) {
1737                 /* lets try <path>.gz if we're decompressing */
1738                 if (dflag && s == NULL && errno == ENOENT) {
1739                         len = strlen(path);
1740                         slen = suffixes[0].ziplen;
1741                         s = malloc(len + slen + 1);
1742                         if (s == NULL)
1743                                 maybe_err("malloc");
1744                         memcpy(s, path, len);
1745                         memcpy(s + len, suffixes[0].zipped, slen + 1);
1746                         path = s;
1747                         goto retry;
1748                 }
1749                 maybe_warn("can't stat: %s", opath);
1750                 goto out;
1751         }
1752
1753         if (S_ISDIR(sb.st_mode)) {
1754 #ifndef SMALL
1755                 if (rflag)
1756                         handle_dir(path);
1757                 else
1758 #endif
1759                         maybe_warnx("%s is a directory", path);
1760                 goto out;
1761         }
1762
1763         if (S_ISREG(sb.st_mode))
1764                 handle_file(path, &sb);
1765         else
1766                 maybe_warnx("%s is not a regular file", path);
1767
1768 out:
1769         if (s)
1770                 free(s);
1771 }
1772
1773 /* compress/decompress a file */
1774 static void
1775 handle_file(char *file, struct stat *sbp)
1776 {
1777         off_t usize, gsize;
1778         char    outfile[PATH_MAX];
1779
1780         infile = file;
1781         if (dflag) {
1782                 usize = file_uncompress(file, outfile, sizeof(outfile));
1783 #ifndef SMALL
1784                 if (vflag && tflag)
1785                         print_test(file, usize != -1);
1786 #endif
1787                 if (usize == -1)
1788                         return;
1789                 gsize = sbp->st_size;
1790         } else {
1791                 gsize = file_compress(file, outfile, sizeof(outfile));
1792                 if (gsize == -1)
1793                         return;
1794                 usize = sbp->st_size;
1795         }
1796
1797
1798 #ifndef SMALL
1799         if (vflag && !tflag)
1800                 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
1801 #endif
1802 }
1803
1804 #ifndef SMALL
1805 /* this is used with -r to recursively descend directories */
1806 static void
1807 handle_dir(char *dir)
1808 {
1809         char *path_argv[2];
1810         FTS *fts;
1811         FTSENT *entry;
1812
1813         path_argv[0] = dir;
1814         path_argv[1] = NULL;
1815         fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
1816         if (fts == NULL) {
1817                 warn("couldn't fts_open %s", dir);
1818                 return;
1819         }
1820
1821         while ((entry = fts_read(fts))) {
1822                 switch(entry->fts_info) {
1823                 case FTS_D:
1824                 case FTS_DP:
1825                         continue;
1826
1827                 case FTS_DNR:
1828                 case FTS_ERR:
1829                 case FTS_NS:
1830                         maybe_warn("%s", entry->fts_path);
1831                         continue;
1832                 case FTS_F:
1833                         handle_file(entry->fts_path, entry->fts_statp);
1834                 }
1835         }
1836         (void)fts_close(fts);
1837 }
1838 #endif
1839
1840 /* print a ratio - size reduction as a fraction of uncompressed size */
1841 static void
1842 print_ratio(off_t in, off_t out, FILE *where)
1843 {
1844         int percent10;  /* 10 * percent */
1845         off_t diff;
1846         char buff[8];
1847         int len;
1848
1849         diff = in - out/2;
1850         if (diff <= 0)
1851                 /*
1852                  * Output is more than double size of input! print -99.9%
1853                  * Quite possibly we've failed to get the original size.
1854                  */
1855                 percent10 = -999;
1856         else {
1857                 /*
1858                  * We only need 12 bits of result from the final division,
1859                  * so reduce the values until a 32bit division will suffice.
1860                  */
1861                 while (in > 0x100000) {
1862                         diff >>= 1;
1863                         in >>= 1;
1864                 }
1865                 if (in != 0)
1866                         percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
1867                 else
1868                         percent10 = 0;
1869         }
1870
1871         len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
1872         /* Move the '.' to before the last digit */
1873         buff[len - 1] = buff[len - 2];
1874         buff[len - 2] = '.';
1875         fprintf(where, "%5s%%", buff);
1876 }
1877
1878 #ifndef SMALL
1879 /* print compression statistics, and the new name (if there is one!) */
1880 static void
1881 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
1882 {
1883         if (file)
1884                 fprintf(stderr, "%s:%s  ", file,
1885                     strlen(file) < 7 ? "\t\t" : "\t");
1886         print_ratio(usize, gsize, stderr);
1887         if (nfile)
1888                 fprintf(stderr, " -- replaced with %s", nfile);
1889         fprintf(stderr, "\n");
1890         fflush(stderr);
1891 }
1892
1893 /* print test results */
1894 static void
1895 print_test(const char *file, int ok)
1896 {
1897
1898         if (exit_value == 0 && ok == 0)
1899                 exit_value = 1;
1900         fprintf(stderr, "%s:%s  %s\n", file,
1901             strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
1902         fflush(stderr);
1903 }
1904 #endif
1905
1906 /* print a file's info ala --list */
1907 /* eg:
1908   compressed uncompressed  ratio uncompressed_name
1909       354841      1679360  78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
1910 */
1911 static void
1912 print_list(int fd, off_t out, const char *outfile, time_t ts)
1913 {
1914         static int first = 1;
1915 #ifndef SMALL
1916         static off_t in_tot, out_tot;
1917         uint32_t crc = 0;
1918 #endif
1919         off_t in = 0, rv;
1920
1921         if (first) {
1922 #ifndef SMALL
1923                 if (vflag)
1924                         printf("method  crc     date  time  ");
1925 #endif
1926                 if (qflag == 0)
1927                         printf("  compressed uncompressed  "
1928                                "ratio uncompressed_name\n");
1929         }
1930         first = 0;
1931
1932         /* print totals? */
1933 #ifndef SMALL
1934         if (fd == -1) {
1935                 in = in_tot;
1936                 out = out_tot;
1937         } else
1938 #endif
1939         {
1940                 /* read the last 4 bytes - this is the uncompressed size */
1941                 rv = lseek(fd, (off_t)(-8), SEEK_END);
1942                 if (rv != -1) {
1943                         unsigned char buf[8];
1944                         uint32_t usize;
1945
1946                         rv = read(fd, (char *)buf, sizeof(buf));
1947                         if (rv == -1)
1948                                 maybe_warn("read of uncompressed size");
1949                         else if (rv != sizeof(buf))
1950                                 maybe_warnx("read of uncompressed size");
1951
1952                         else {
1953                                 usize = buf[4] | buf[5] << 8 |
1954                                         buf[6] << 16 | buf[7] << 24;
1955                                 in = (off_t)usize;
1956 #ifndef SMALL
1957                                 crc = buf[0] | buf[1] << 8 |
1958                                       buf[2] << 16 | buf[3] << 24;
1959 #endif
1960                         }
1961                 }
1962         }
1963
1964 #ifndef SMALL
1965         if (vflag && fd == -1)
1966                 printf("                            ");
1967         else if (vflag) {
1968                 char *date = ctime(&ts);
1969
1970                 /* skip the day, 1/100th second, and year */
1971                 date += 4;
1972                 date[12] = 0;
1973                 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
1974         }
1975         in_tot += in;
1976         out_tot += out;
1977 #endif
1978         printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
1979         print_ratio(in, out, stdout);
1980         printf(" %s\n", outfile);
1981 }
1982
1983 /* display the usage of NetBSD gzip */
1984 static void
1985 usage(void)
1986 {
1987
1988         fprintf(stderr, "%s\n", gzip_version);
1989         fprintf(stderr,
1990 #ifdef SMALL
1991         "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n",
1992 #else
1993         "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n"
1994         " -1 --fast            fastest (worst) compression\n"
1995         " -2 .. -8             set compression level\n"
1996         " -9 --best            best (slowest) compression\n"
1997         " -c --stdout          write to stdout, keep original files\n"
1998         "    --to-stdout\n"
1999         " -d --decompress      uncompress files\n"
2000         "    --uncompress\n"
2001         " -f --force           force overwriting & compress links\n"
2002         " -h --help            display this help\n"
2003         " -k --keep            don't delete input files during operation\n"
2004         " -l --list            list compressed file contents\n"
2005         " -N --name            save or restore original file name and time stamp\n"
2006         " -n --no-name         don't save original file name or time stamp\n"
2007         " -q --quiet           output no warnings\n"
2008         " -r --recursive       recursively compress files in directories\n"
2009         " -S .suf              use suffix .suf instead of .gz\n"
2010         "    --suffix .suf\n"
2011         " -t --test            test compressed file\n"
2012         " -V --version         display program version\n"
2013         " -v --verbose         print extra statistics\n",
2014 #endif
2015         getprogname());
2016         exit(0);
2017 }
2018
2019 /* display the version of NetBSD gzip */
2020 static void
2021 display_version(void)
2022 {
2023
2024         fprintf(stderr, "%s\n", gzip_version);
2025         exit(0);
2026 }
2027
2028 #ifndef NO_BZIP2_SUPPORT
2029 #include "unbzip2.c"
2030 #endif
2031 #ifndef NO_COMPRESS_SUPPORT
2032 #include "zuncompress.c"
2033 #endif
2034 #ifndef NO_PACK_SUPPORT
2035 #include "unpack.c"
2036 #endif
2037
2038 static ssize_t
2039 read_retry(int fd, void *buf, size_t sz)
2040 {
2041         char *cp = buf;
2042         size_t left = MIN(sz, (size_t) SSIZE_MAX);
2043
2044         while (left > 0) {
2045                 ssize_t ret;
2046
2047                 ret = read(fd, cp, left);
2048                 if (ret == -1) {
2049                         return ret;
2050                 } else if (ret == 0) {
2051                         break; /* EOF */
2052                 }
2053                 cp += ret;
2054                 left -= ret;
2055         }
2056
2057         return sz - left;
2058 }