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Correct param.h entry for this version.
[dragonfly.git] / usr.bin / gzip / gzip.c
blob9dc390bde10c269899a6cc65d5153eb77d54a774
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 (sizeof suffixes / sizeof suffixes[0])
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);
199 static void display_version(void);
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 if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0)
1061 maybe_warn("couldn't fchflags: %s", file);
1062
1063 TIMESPEC_TO_TIMEVAL(&times[0], &sb.st_atimespec);
1064 TIMESPEC_TO_TIMEVAL(&times[1], &sb.st_mtimespec);
1065 if (futimes(fd, times) < 0)
1066 maybe_warn("couldn't utimes: %s", file);
1067 }
1068 #endif
1069
1070 /* what sort of file is this? */
1071 static enum filetype
1072 file_gettype(u_char *buf)
1073 {
1074
1075 if (buf[0] == GZIP_MAGIC0 &&
1076 (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
1077 return FT_GZIP;
1078 else
1079 #ifndef NO_BZIP2_SUPPORT
1080 if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
1081 buf[3] >= '0' && buf[3] <= '9')
1082 return FT_BZIP2;
1083 else
1084 #endif
1085 #ifndef NO_COMPRESS_SUPPORT
1086 if (memcmp(buf, Z_MAGIC, 2) == 0)
1087 return FT_Z;
1088 else
1089 #endif
1090 #ifndef NO_PACK_SUPPORT
1091 if (memcmp(buf, PACK_MAGIC, 2) == 0)
1092 return FT_PACK;
1093 else
1094 #endif
1095 return FT_UNKNOWN;
1096 }
1097
1098 #ifndef SMALL
1099 /* check the outfile is OK. */
1100 static int
1101 check_outfile(const char *outfile)
1102 {
1103 struct stat sb;
1104 int ok = 1;
1105
1106 if (lflag == 0 && stat(outfile, &sb) == 0) {
1107 if (fflag)
1108 unlink(outfile);
1109 else if (isatty(STDIN_FILENO)) {
1110 char ans[10] = { 'n', '\0' }; /* default */
1111
1112 fprintf(stderr, "%s already exists -- do you wish to "
1113 "overwrite (y or n)? " , outfile);
1114 (void)fgets(ans, sizeof(ans) - 1, stdin);
1115 if (ans[0] != 'y' && ans[0] != 'Y') {
1116 fprintf(stderr, "\tnot overwriting\n");
1117 ok = 0;
1118 } else
1119 unlink(outfile);
1120 } else {
1121 maybe_warnx("%s already exists -- skipping", outfile);
1122 ok = 0;
1123 }
1124 }
1125 return ok;
1126 }
1127
1128 static void
1129 unlink_input(const char *file, const struct stat *sb)
1130 {
1131 struct stat nsb;
1132
1133 if (kflag)
1134 return;
1135 if (stat(file, &nsb) != 0)
1136 /* Must be gone alrady */
1137 return;
1138 if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
1139 /* Definitely a different file */
1140 return;
1141 unlink(file);
1142 }
1143 #endif
1144
1145 static const suffixes_t *
1146 check_suffix(char *file, int xlate)
1147 {
1148 const suffixes_t *s;
1149 int len = strlen(file);
1150 char *sp;
1151
1152 for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
1153 /* if it doesn't fit in "a.suf", don't bother */
1154 if (s->ziplen >= len)
1155 continue;
1156 sp = file + len - s->ziplen;
1157 if (strcmp(s->zipped, sp) != 0)
1158 continue;
1159 if (xlate)
1160 strcpy(sp, s->normal);
1161 return s;
1162 }
1163 return NULL;
1164 }
1165
1166 /*
1167 * compress the given file: create a corresponding .gz file and remove the
1168 * original.
1169 */
1170 static off_t
1171 file_compress(char *file, char *outfile, size_t outsize)
1172 {
1173 int in;
1174 int out;
1175 off_t size, insize;
1176 #ifndef SMALL
1177 struct stat isb, osb;
1178 const suffixes_t *suff;
1179 #endif
1180
1181 in = open(file, O_RDONLY);
1182 if (in == -1) {
1183 maybe_warn("can't open %s", file);
1184 return -1;
1185 }
1186
1187 if (cflag == 0) {
1188 #ifndef SMALL
1189 if (fstat(in, &isb) == 0) {
1190 if (isb.st_nlink > 1 && fflag == 0) {
1191 maybe_warnx("%s has %d other link%s -- "
1192 "skipping", file, isb.st_nlink - 1,
1193 isb.st_nlink == 1 ? "" : "s");
1194 close(in);
1195 return -1;
1196 }
1197 }
1198
1199 if (fflag == 0 && (suff = check_suffix(file, 0))
1200 && suff->zipped[0] != 0) {
1201 maybe_warnx("%s already has %s suffix -- unchanged",
1202 file, suff->zipped);
1203 close(in);
1204 return -1;
1205 }
1206 #endif
1207
1208 /* Add (usually) .gz to filename */
1209 if ((size_t)snprintf(outfile, outsize, "%s%s",
1210 file, suffixes[0].zipped) >= outsize) {
1211 errx(1, "file path too long: %s", file);
1212 }
1213 #ifndef SMALL
1214 if (check_outfile(outfile) == 0) {
1215 close(in);
1216 return -1;
1217 }
1218 #endif
1219 }
1220
1221 if (cflag == 0) {
1222 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
1223 if (out == -1) {
1224 maybe_warn("could not create output: %s", outfile);
1225 fclose(stdin);
1226 return -1;
1227 }
1228 } else
1229 out = STDOUT_FILENO;
1230
1231 insize = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
1232
1233 (void)close(in);
1234
1235 /*
1236 * If there was an error, insize will be -1.
1237 * If we compressed to stdout, just return the size.
1238 * Otherwise stat the file and check it is the correct size.
1239 * We only blow away the file if we can stat the output and it
1240 * has the expected size.
1241 */
1242 if (cflag != 0)
1243 return insize == -1 ? -1 : size;
1244
1245 #ifndef SMALL
1246 if (fstat(out, &osb) != 0) {
1247 maybe_warn("couldn't stat: %s", outfile);
1248 goto bad_outfile;
1249 }
1250
1251 if (osb.st_size != size) {
1252 maybe_warnx("output file: %s wrong size (%" PRIdOFF
1253 " != %" PRIdOFF "), deleting",
1254 outfile, osb.st_size, size);
1255 goto bad_outfile;
1256 }
1257
1258 copymodes(out, &isb, outfile);
1259 #endif
1260 if (close(out) == -1)
1261 maybe_warn("couldn't close output");
1262
1263 /* output is good, ok to delete input */
1264 unlink_input(file, &isb);
1265 return size;
1266
1267 #ifndef SMALL
1268 bad_outfile:
1269 if (close(out) == -1)
1270 maybe_warn("couldn't close output");
1271
1272 maybe_warnx("leaving original %s", file);
1273 unlink(outfile);
1274 return size;
1275 #endif
1276 }
1277
1278 /* uncompress the given file and remove the original */
1279 static off_t
1280 file_uncompress(char *file, char *outfile, size_t outsize)
1281 {
1282 struct stat isb, osb;
1283 off_t size;
1284 ssize_t rbytes;
1285 unsigned char header1[4];
1286 enum filetype method;
1287 int fd, ofd, zfd = -1;
1288 #ifndef SMALL
1289 ssize_t rv;
1290 time_t timestamp = 0;
1291 unsigned char name[PATH_MAX + 1];
1292 #endif
1293
1294 /* gather the old name info */
1295
1296 fd = open(file, O_RDONLY);
1297 if (fd < 0) {
1298 maybe_warn("can't open %s", file);
1299 goto lose;
1300 }
1301
1302 if ((size_t)snprintf(outfile, outsize, "%s", file) >= outsize)
1303 errx(1, "file path too long: %s", file);
1304 if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
1305 maybe_warnx("%s: unknown suffix -- ignored", file);
1306 goto lose;
1307 }
1308
1309 rbytes = read(fd, header1, sizeof header1);
1310 if (rbytes != sizeof header1) {
1311 /* we don't want to fail here. */
1312 #ifndef SMALL
1313 if (fflag)
1314 goto lose;
1315 #endif
1316 if (rbytes == -1)
1317 maybe_warn("can't read %s", file);
1318 else
1319 goto unexpected_EOF;
1320 goto lose;
1321 }
1322
1323 method = file_gettype(header1);
1324
1325 #ifndef SMALL
1326 if (fflag == 0 && method == FT_UNKNOWN) {
1327 maybe_warnx("%s: not in gzip format", file);
1328 goto lose;
1329 }
1330
1331 #endif
1332
1333 #ifndef SMALL
1334 if (method == FT_GZIP && Nflag) {
1335 unsigned char ts[4]; /* timestamp */
1336
1337 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP);
1338 if (rv >= 0 && rv < (ssize_t)(sizeof ts))
1339 goto unexpected_EOF;
1340 if (rv == -1) {
1341 if (!fflag)
1342 maybe_warn("can't read %s", file);
1343 goto lose;
1344 }
1345 timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0];
1346
1347 if (header1[3] & ORIG_NAME) {
1348 rbytes = pread(fd, name, sizeof name, GZIP_ORIGNAME);
1349 if (rbytes < 0) {
1350 maybe_warn("can't read %s", file);
1351 goto lose;
1352 }
1353 if (name[0] != 0) {
1354 /* preserve original directory name */
1355 char *dp = strrchr(file, '/');
1356 if (dp == NULL)
1357 dp = file;
1358 else
1359 dp++;
1360 snprintf(outfile, outsize, "%.*s%.*s",
1361 (int) (dp - file),
1362 file, (int) rbytes, name);
1363 }
1364 }
1365 }
1366 #endif
1367 lseek(fd, 0, SEEK_SET);
1368
1369 if (cflag == 0 || lflag) {
1370 if (fstat(fd, &isb) != 0)
1371 goto lose;
1372 #ifndef SMALL
1373 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
1374 maybe_warnx("%s has %d other links -- skipping",
1375 file, isb.st_nlink - 1);
1376 goto lose;
1377 }
1378 if (nflag == 0 && timestamp)
1379 isb.st_mtime = timestamp;
1380 if (check_outfile(outfile) == 0)
1381 goto lose;
1382 #endif
1383 }
1384
1385 if (cflag == 0 && lflag == 0) {
1386 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
1387 if (zfd == STDOUT_FILENO) {
1388 /* We won't close STDOUT_FILENO later... */
1389 zfd = dup(zfd);
1390 close(STDOUT_FILENO);
1391 }
1392 if (zfd == -1) {
1393 maybe_warn("can't open %s", outfile);
1394 goto lose;
1395 }
1396 } else
1397 zfd = STDOUT_FILENO;
1398
1399 #ifndef NO_BZIP2_SUPPORT
1400 if (method == FT_BZIP2) {
1401
1402 /* XXX */
1403 if (lflag) {
1404 maybe_warnx("no -l with bzip2 files");
1405 goto lose;
1406 }
1407
1408 size = unbzip2(fd, zfd, NULL, 0, NULL);
1409 } else
1410 #endif
1411
1412 #ifndef NO_COMPRESS_SUPPORT
1413 if (method == FT_Z) {
1414 FILE *in, *out;
1415
1416 /* XXX */
1417 if (lflag) {
1418 maybe_warnx("no -l with Lempel-Ziv files");
1419 goto lose;
1420 }
1421
1422 if ((in = zdopen(fd)) == NULL) {
1423 maybe_warn("zdopen for read: %s", file);
1424 goto lose;
1425 }
1426
1427 out = fdopen(dup(zfd), "w");
1428 if (out == NULL) {
1429 maybe_warn("fdopen for write: %s", outfile);
1430 fclose(in);
1431 goto lose;
1432 }
1433
1434 size = zuncompress(in, out, NULL, 0, NULL);
1435 /* need to fclose() if ferror() is true... */
1436 if (ferror(in) | fclose(in)) {
1437 maybe_warn("failed infile fclose");
1438 unlink(outfile);
1439 (void)fclose(out);
1440 }
1441 if (fclose(out) != 0) {
1442 maybe_warn("failed outfile fclose");
1443 unlink(outfile);
1444 goto lose;
1445 }
1446 } else
1447 #endif
1448
1449 #ifndef NO_PACK_SUPPORT
1450 if (method == FT_PACK) {
1451 if (lflag) {
1452 maybe_warnx("no -l with packed files");
1453 goto lose;
1454 }
1455
1456 size = unpack(fd, zfd, NULL, 0, NULL);
1457 } else
1458 #endif
1459
1460 #ifndef SMALL
1461 if (method == FT_UNKNOWN) {
1462 if (lflag) {
1463 maybe_warnx("no -l for unknown filetypes");
1464 goto lose;
1465 }
1466 size = cat_fd(NULL, 0, NULL, fd);
1467 } else
1468 #endif
1469 {
1470 if (lflag) {
1471 print_list(fd, isb.st_size, outfile, isb.st_mtime);
1472 close(fd);
1473 return -1; /* XXX */
1474 }
1475
1476 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
1477 }
1478
1479 if (close(fd) != 0)
1480 maybe_warn("couldn't close input");
1481 if (zfd != STDOUT_FILENO && close(zfd) != 0)
1482 maybe_warn("couldn't close output");
1483
1484 if (size == -1) {
1485 if (cflag == 0)
1486 unlink(outfile);
1487 maybe_warnx("%s: uncompress failed", file);
1488 return -1;
1489 }
1490
1491 /* if testing, or we uncompressed to stdout, this is all we need */
1492 #ifndef SMALL
1493 if (tflag)
1494 return size;
1495 #endif
1496 /* if we are uncompressing to stdin, don't remove the file. */
1497 if (cflag)
1498 return size;
1499
1500 /*
1501 * if we create a file...
1502 */
1503 /*
1504 * if we can't stat the file don't remove the file.
1505 */
1506
1507 ofd = open(outfile, O_RDWR, 0);
1508 if (ofd == -1) {
1509 maybe_warn("couldn't open (leaving original): %s",
1510 outfile);
1511 return -1;
1512 }
1513 if (fstat(ofd, &osb) != 0) {
1514 maybe_warn("couldn't stat (leaving original): %s",
1515 outfile);
1516 close(ofd);
1517 return -1;
1518 }
1519 if (osb.st_size != size) {
1520 maybe_warnx("stat gave different size: %" PRIdOFF
1521 " != %" PRIdOFF " (leaving original)",
1522 size, osb.st_size);
1523 close(ofd);
1524 unlink(outfile);
1525 return -1;
1526 }
1527 unlink_input(file, &isb);
1528 #ifndef SMALL
1529 copymodes(ofd, &isb, outfile);
1530 #endif
1531 close(ofd);
1532 return size;
1533
1534 unexpected_EOF:
1535 maybe_warnx("%s: unexpected end of file", file);
1536 lose:
1537 if (fd != -1)
1538 close(fd);
1539 if (zfd != -1 && zfd != STDOUT_FILENO)
1540 close(fd);
1541 return -1;
1542 }
1543
1544 #ifndef SMALL
1545 static off_t
1546 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd)
1547 {
1548 char buf[BUFLEN];
1549 off_t in_tot;
1550 ssize_t w;
1551
1552 in_tot = count;
1553 w = write(STDOUT_FILENO, prepend, count);
1554 if (w == -1 || (size_t)w != count) {
1555 maybe_warn("write to stdout");
1556 return -1;
1557 }
1558 for (;;) {
1559 ssize_t rv;
1560
1561 rv = read(fd, buf, sizeof buf);
1562 if (rv == 0)
1563 break;
1564 if (rv < 0) {
1565 maybe_warn("read from fd %d", fd);
1566 break;
1567 }
1568
1569 if (write(STDOUT_FILENO, buf, rv) != rv) {
1570 maybe_warn("write to stdout");
1571 break;
1572 }
1573 in_tot += rv;
1574 }
1575
1576 if (gsizep)
1577 *gsizep = in_tot;
1578 return (in_tot);
1579 }
1580 #endif
1581
1582 static void
1583 handle_stdin(void)
1584 {
1585 unsigned char header1[4];
1586 off_t usize, gsize;
1587 enum filetype method;
1588 ssize_t bytes_read;
1589 #ifndef NO_COMPRESS_SUPPORT
1590 FILE *in;
1591 #endif
1592
1593 #ifndef SMALL
1594 if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
1595 maybe_warnx("standard input is a terminal -- ignoring");
1596 return;
1597 }
1598 #endif
1599
1600 if (lflag) {
1601 struct stat isb;
1602
1603 /* XXX could read the whole file, etc. */
1604 if (fstat(STDIN_FILENO, &isb) < 0) {
1605 maybe_warn("fstat");
1606 return;
1607 }
1608 print_list(STDIN_FILENO, isb.st_size, "stdout", isb.st_mtime);
1609 return;
1610 }
1611
1612 bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1);
1613 if (bytes_read == -1) {
1614 maybe_warn("can't read stdin");
1615 return;
1616 } else if (bytes_read != sizeof(header1)) {
1617 maybe_warnx("(stdin): unexpected end of file");
1618 return;
1619 }
1620
1621 method = file_gettype(header1);
1622 switch (method) {
1623 default:
1624 #ifndef SMALL
1625 if (fflag == 0) {
1626 maybe_warnx("unknown compression format");
1627 return;
1628 }
1629 usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO);
1630 break;
1631 #endif
1632 case FT_GZIP:
1633 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
1634 header1, sizeof header1, &gsize, "(stdin)");
1635 break;
1636 #ifndef NO_BZIP2_SUPPORT
1637 case FT_BZIP2:
1638 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
1639 header1, sizeof header1, &gsize);
1640 break;
1641 #endif
1642 #ifndef NO_COMPRESS_SUPPORT
1643 case FT_Z:
1644 if ((in = zdopen(STDIN_FILENO)) == NULL) {
1645 maybe_warnx("zopen of stdin");
1646 return;
1647 }
1648
1649 usize = zuncompress(in, stdout, header1, sizeof header1, &gsize);
1650 fclose(in);
1651 break;
1652 #endif
1653 #ifndef NO_PACK_SUPPORT
1654 case FT_PACK:
1655 usize = unpack(STDIN_FILENO, STDOUT_FILENO,
1656 (char *)header1, sizeof header1, &gsize);
1657 break;
1658 #endif
1659 }
1660
1661 #ifndef SMALL
1662 if (vflag && !tflag && usize != -1 && gsize != -1)
1663 print_verbage(NULL, NULL, usize, gsize);
1664 if (vflag && tflag)
1665 print_test("(stdin)", usize != -1);
1666 #endif
1667
1668 }
1669
1670 static void
1671 handle_stdout(void)
1672 {
1673 off_t gsize, usize;
1674 struct stat sb;
1675 time_t systime;
1676 uint32_t mtime;
1677 int ret;
1678
1679 #ifndef SMALL
1680 if (fflag == 0 && isatty(STDOUT_FILENO)) {
1681 maybe_warnx("standard output is a terminal -- ignoring");
1682 return;
1683 }
1684 #endif
1685 /* If stdin is a file use it's mtime, otherwise use current time */
1686 ret = fstat(STDIN_FILENO, &sb);
1687
1688 #ifndef SMALL
1689 if (ret < 0) {
1690 maybe_warn("Can't stat stdin");
1691 return;
1692 }
1693 #endif
1694
1695 if (S_ISREG(sb.st_mode))
1696 mtime = (uint32_t)sb.st_mtime;
1697 else {
1698 systime = time(NULL);
1699 #ifndef SMALL
1700 if (systime == -1) {
1701 maybe_warn("time");
1702 return;
1703 }
1704 #endif
1705 mtime = (uint32_t)systime;
1706 }
1707
1708 usize = gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime);
1709 #ifndef SMALL
1710 if (vflag && !tflag && usize != -1 && gsize != -1)
1711 print_verbage(NULL, NULL, usize, gsize);
1712 #endif
1713 }
1714
1715 /* do what is asked for, for the path name */
1716 static void
1717 handle_pathname(char *path)
1718 {
1719 char *opath = path, *s = NULL;
1720 ssize_t len;
1721 int slen;
1722 struct stat sb;
1723
1724 /* check for stdout/stdin */
1725 if (path[0] == '-' && path[1] == '\0') {
1726 if (dflag)
1727 handle_stdin();
1728 else
1729 handle_stdout();
1730 return;
1731 }
1732
1733 retry:
1734 if (stat(path, &sb) != 0) {
1735 /* lets try <path>.gz if we're decompressing */
1736 if (dflag && s == NULL && errno == ENOENT) {
1737 len = strlen(path);
1738 slen = suffixes[0].ziplen;
1739 s = malloc(len + slen + 1);
1740 if (s == NULL)
1741 maybe_err("malloc");
1742 memcpy(s, path, len);
1743 memcpy(s + len, suffixes[0].zipped, slen + 1);
1744 path = s;
1745 goto retry;
1746 }
1747 maybe_warn("can't stat: %s", opath);
1748 goto out;
1749 }
1750
1751 if (S_ISDIR(sb.st_mode)) {
1752 #ifndef SMALL
1753 if (rflag)
1754 handle_dir(path);
1755 else
1756 #endif
1757 maybe_warnx("%s is a directory", path);
1758 goto out;
1759 }
1760
1761 if (S_ISREG(sb.st_mode))
1762 handle_file(path, &sb);
1763 else
1764 maybe_warnx("%s is not a regular file", path);
1765
1766 out:
1767 if (s)
1768 free(s);
1769 }
1770
1771 /* compress/decompress a file */
1772 static void
1773 handle_file(char *file, struct stat *sbp)
1774 {
1775 off_t usize, gsize;
1776 char outfile[PATH_MAX];
1777
1778 infile = file;
1779 if (dflag) {
1780 usize = file_uncompress(file, outfile, sizeof(outfile));
1781 #ifndef SMALL
1782 if (vflag && tflag)
1783 print_test(file, usize != -1);
1784 #endif
1785 if (usize == -1)
1786 return;
1787 gsize = sbp->st_size;
1788 } else {
1789 gsize = file_compress(file, outfile, sizeof(outfile));
1790 if (gsize == -1)
1791 return;
1792 usize = sbp->st_size;
1793 }
1794
1795
1796 #ifndef SMALL
1797 if (vflag && !tflag)
1798 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
1799 #endif
1800 }
1801
1802 #ifndef SMALL
1803 /* this is used with -r to recursively descend directories */
1804 static void
1805 handle_dir(char *dir)
1806 {
1807 char *path_argv[2];
1808 FTS *fts;
1809 FTSENT *entry;
1810
1811 path_argv[0] = dir;
1812 path_argv[1] = NULL;
1813 fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
1814 if (fts == NULL) {
1815 warn("couldn't fts_open %s", dir);
1816 return;
1817 }
1818
1819 while ((entry = fts_read(fts))) {
1820 switch(entry->fts_info) {
1821 case FTS_D:
1822 case FTS_DP:
1823 continue;
1824
1825 case FTS_DNR:
1826 case FTS_ERR:
1827 case FTS_NS:
1828 maybe_warn("%s", entry->fts_path);
1829 continue;
1830 case FTS_F:
1831 handle_file(entry->fts_path, entry->fts_statp);
1832 }
1833 }
1834 (void)fts_close(fts);
1835 }
1836 #endif
1837
1838 /* print a ratio - size reduction as a fraction of uncompressed size */
1839 static void
1840 print_ratio(off_t in, off_t out, FILE *where)
1841 {
1842 int percent10; /* 10 * percent */
1843 off_t diff;
1844 char buff[8];
1845 int len;
1846
1847 diff = in - out/2;
1848 if (diff <= 0)
1849 /*
1850 * Output is more than double size of input! print -99.9%
1851 * Quite possibly we've failed to get the original size.
1852 */
1853 percent10 = -999;
1854 else {
1855 /*
1856 * We only need 12 bits of result from the final division,
1857 * so reduce the values until a 32bit division will suffice.
1858 */
1859 while (in > 0x100000) {
1860 diff >>= 1;
1861 in >>= 1;
1862 }
1863 if (in != 0)
1864 percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
1865 else
1866 percent10 = 0;
1867 }
1868
1869 len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
1870 /* Move the '.' to before the last digit */
1871 buff[len - 1] = buff[len - 2];
1872 buff[len - 2] = '.';
1873 fprintf(where, "%5s%%", buff);
1874 }
1875
1876 #ifndef SMALL
1877 /* print compression statistics, and the new name (if there is one!) */
1878 static void
1879 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
1880 {
1881 if (file)
1882 fprintf(stderr, "%s:%s ", file,
1883 strlen(file) < 7 ? "\t\t" : "\t");
1884 print_ratio(usize, gsize, stderr);
1885 if (nfile)
1886 fprintf(stderr, " -- replaced with %s", nfile);
1887 fprintf(stderr, "\n");
1888 fflush(stderr);
1889 }
1890
1891 /* print test results */
1892 static void
1893 print_test(const char *file, int ok)
1894 {
1895
1896 if (exit_value == 0 && ok == 0)
1897 exit_value = 1;
1898 fprintf(stderr, "%s:%s %s\n", file,
1899 strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
1900 fflush(stderr);
1901 }
1902 #endif
1903
1904 /* print a file's info ala --list */
1905 /* eg:
1906 compressed uncompressed ratio uncompressed_name
1907 354841 1679360 78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
1908 */
1909 static void
1910 print_list(int fd, off_t out, const char *outfile, time_t ts)
1911 {
1912 static int first = 1;
1913 #ifndef SMALL
1914 static off_t in_tot, out_tot;
1915 uint32_t crc = 0;
1916 #endif
1917 off_t in = 0, rv;
1918
1919 if (first) {
1920 #ifndef SMALL
1921 if (vflag)
1922 printf("method crc date time ");
1923 #endif
1924 if (qflag == 0)
1925 printf(" compressed uncompressed "
1926 "ratio uncompressed_name\n");
1927 }
1928 first = 0;
1929
1930 /* print totals? */
1931 #ifndef SMALL
1932 if (fd == -1) {
1933 in = in_tot;
1934 out = out_tot;
1935 } else
1936 #endif
1937 {
1938 /* read the last 4 bytes - this is the uncompressed size */
1939 rv = lseek(fd, (off_t)(-8), SEEK_END);
1940 if (rv != -1) {
1941 unsigned char buf[8];
1942 uint32_t usize;
1943
1944 rv = read(fd, (char *)buf, sizeof(buf));
1945 if (rv == -1)
1946 maybe_warn("read of uncompressed size");
1947 else if (rv != sizeof(buf))
1948 maybe_warnx("read of uncompressed size");
1949
1950 else {
1951 usize = buf[4] | buf[5] << 8 |
1952 buf[6] << 16 | buf[7] << 24;
1953 in = (off_t)usize;
1954 #ifndef SMALL
1955 crc = buf[0] | buf[1] << 8 |
1956 buf[2] << 16 | buf[3] << 24;
1957 #endif
1958 }
1959 }
1960 }
1961
1962 #ifndef SMALL
1963 if (vflag && fd == -1)
1964 printf(" ");
1965 else if (vflag) {
1966 char *date = ctime(&ts);
1967
1968 /* skip the day, 1/100th second, and year */
1969 date += 4;
1970 date[12] = 0;
1971 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
1972 }
1973 in_tot += in;
1974 out_tot += out;
1975 #endif
1976 printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
1977 print_ratio(in, out, stdout);
1978 printf(" %s\n", outfile);
1979 }
1980
1981 /* display the usage of NetBSD gzip */
1982 static void
1983 usage(void)
1984 {
1985
1986 fprintf(stderr, "%s\n", gzip_version);
1987 fprintf(stderr,
1988 #ifdef SMALL
1989 "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n",
1990 #else
1991 "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n"
1992 " -1 --fast fastest (worst) compression\n"
1993 " -2 .. -8 set compression level\n"
1994 " -9 --best best (slowest) compression\n"
1995 " -c --stdout write to stdout, keep original files\n"
1996 " --to-stdout\n"
1997 " -d --decompress uncompress files\n"
1998 " --uncompress\n"
1999 " -f --force force overwriting & compress links\n"
2000 " -h --help display this help\n"
2001 " -k --keep don't delete input files during operation\n"
2002 " -l --list list compressed file contents\n"
2003 " -N --name save or restore original file name and time stamp\n"
2004 " -n --no-name don't save original file name or time stamp\n"
2005 " -q --quiet output no warnings\n"
2006 " -r --recursive recursively compress files in directories\n"
2007 " -S .suf use suffix .suf instead of .gz\n"
2008 " --suffix .suf\n"
2009 " -t --test test compressed file\n"
2010 " -V --version display program version\n"
2011 " -v --verbose print extra statistics\n",
2012 #endif
2013 getprogname());
2014 exit(0);
2015 }
2016
2017 /* display the version of NetBSD gzip */
2018 static void
2019 display_version(void)
2020 {
2021
2022 fprintf(stderr, "%s\n", gzip_version);
2023 exit(0);
2024 }
2025
2026 #ifndef NO_BZIP2_SUPPORT
2027 #include "unbzip2.c"
2028 #endif
2029 #ifndef NO_COMPRESS_SUPPORT
2030 #include "zuncompress.c"
2031 #endif
2032 #ifndef NO_PACK_SUPPORT
2033 #include "unpack.c"
2034 #endif
2035
2036 static ssize_t
2037 read_retry(int fd, void *buf, size_t sz)
2038 {
2039 char *cp = buf;
2040 size_t left = MIN(sz, (size_t) SSIZE_MAX);
2041
2042 while (left > 0) {
2043 ssize_t ret;
2044
2045 ret = read(fd, cp, left);
2046 if (ret == -1) {
2047 return ret;
2048 } else if (ret == 0) {
2049 break; /* EOF */
2050 }
2051 cp += ret;
2052 left -= ret;
2053 }
2054
2055 return sz - left;
2056 }
DragonFly BSD