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arm: protect state after signal handler
[minix.git] / usr.bin / gzip / gzip.c
blobfdbdbc537c673dcc8fdce3d772a7da02af39c5fb
1 /* $NetBSD: gzip.c,v 1.105 2011/08/30 23:06:00 joerg 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 #include <sys/cdefs.h>
30 #ifndef lint
31 __COPYRIGHT("@(#) Copyright (c) 1997, 1998, 2003, 2004, 2006\
32 Matthew R. Green. All rights reserved.");
33 __RCSID("$NetBSD: gzip.c,v 1.105 2011/08/30 23:06:00 joerg Exp $");
34 #endif /* not lint */
35
36 /*
37 * gzip.c -- GPL free gzip using zlib.
38 *
39 * RFC 1950 covers the zlib format
40 * RFC 1951 covers the deflate format
41 * RFC 1952 covers the gzip format
42 *
43 * TODO:
44 * - use mmap where possible
45 * - handle some signals better (remove outfile?)
46 * - make bzip2/compress -v/-t/-l support work as well as possible
47 */
48
49 #include <sys/param.h>
50 #include <sys/stat.h>
51 #include <sys/time.h>
52
53 #include <inttypes.h>
54 #include <unistd.h>
55 #include <stdio.h>
56 #include <string.h>
57 #include <stdlib.h>
58 #include <err.h>
59 #include <errno.h>
60 #include <fcntl.h>
61 #include <zlib.h>
62 #include <fts.h>
63 #include <libgen.h>
64 #include <stdarg.h>
65 #include <getopt.h>
66 #include <time.h>
67
68 #ifndef PRIdOFF
69 #define PRIdOFF PRId32
70 #endif
71
72 /* what type of file are we dealing with */
73 enum filetype {
74 FT_GZIP,
75 #ifndef NO_BZIP2_SUPPORT
76 FT_BZIP2,
77 #endif
78 #ifndef NO_COMPRESS_SUPPORT
79 FT_Z,
80 #endif
81 #ifndef NO_PACK_SUPPORT
82 FT_PACK,
83 #endif
84 #ifndef NO_XZ_SUPPORT
85 FT_XZ,
86 #endif
87 FT_LAST,
88 FT_UNKNOWN
89 };
90
91 #ifndef NO_BZIP2_SUPPORT
92 #include <bzlib.h>
93
94 #define BZ2_SUFFIX ".bz2"
95 #define BZIP2_MAGIC "\102\132\150"
96 #endif
97
98 #ifndef NO_COMPRESS_SUPPORT
99 #define Z_SUFFIX ".Z"
100 #define Z_MAGIC "\037\235"
101 #endif
102
103 #ifndef NO_PACK_SUPPORT
104 #define PACK_MAGIC "\037\036"
105 #endif
106
107 #ifndef NO_XZ_SUPPORT
108 #include <lzma.h>
109 #define XZ_SUFFIX ".xz"
110 #define XZ_MAGIC "\3757zXZ"
111 #endif
112
113 #define GZ_SUFFIX ".gz"
114
115 #define BUFLEN (64 * 1024)
116
117 #define GZIP_MAGIC0 0x1F
118 #define GZIP_MAGIC1 0x8B
119 #define GZIP_OMAGIC1 0x9E
120
121 #define GZIP_TIMESTAMP (off_t)4
122 #define GZIP_ORIGNAME (off_t)10
123
124 #define HEAD_CRC 0x02
125 #define EXTRA_FIELD 0x04
126 #define ORIG_NAME 0x08
127 #define COMMENT 0x10
128
129 #define OS_CODE 3 /* Unix */
130
131 typedef struct {
132 const char *zipped;
133 int ziplen;
134 const char *normal; /* for unzip - must not be longer than zipped */
135 } suffixes_t;
136 static suffixes_t suffixes[] = {
137 #define SUFFIX(Z, N) {Z, sizeof Z - 1, N}
138 SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S .xxx */
139 #ifndef SMALL
140 SUFFIX(GZ_SUFFIX, ""),
141 SUFFIX(".z", ""),
142 SUFFIX("-gz", ""),
143 SUFFIX("-z", ""),
144 SUFFIX("_z", ""),
145 SUFFIX(".taz", ".tar"),
146 SUFFIX(".tgz", ".tar"),
147 #ifndef NO_BZIP2_SUPPORT
148 SUFFIX(BZ2_SUFFIX, ""),
149 #endif
150 #ifndef NO_COMPRESS_SUPPORT
151 SUFFIX(Z_SUFFIX, ""),
152 #endif
153 #ifndef NO_XZ_SUPPORT
154 SUFFIX(XZ_SUFFIX, ""),
155 #endif
156 SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S "" */
157 #endif /* SMALL */
158 #undef SUFFIX
159 };
160 #define NUM_SUFFIXES (sizeof suffixes / sizeof suffixes[0])
161 #define SUFFIX_MAXLEN 30
162
163 static const char gzip_version[] = "NetBSD gzip 20101018";
164
165 static int cflag; /* stdout mode */
166 static int dflag; /* decompress mode */
167 static int lflag; /* list mode */
168 static int numflag = 6; /* gzip -1..-9 value */
169
170 #ifndef SMALL
171 static int fflag; /* force mode */
172 static int kflag; /* don't delete input files */
173 static int nflag; /* don't save name/timestamp */
174 static int Nflag; /* don't restore name/timestamp */
175 static int qflag; /* quiet mode */
176 static int rflag; /* recursive mode */
177 static int tflag; /* test */
178 static int vflag; /* verbose mode */
179 #else
180 #define qflag 0
181 #define tflag 0
182 #endif
183
184 static int exit_value = 0; /* exit value */
185
186 static char *infile; /* name of file coming in */
187
188 static void maybe_err(const char *fmt, ...) __printflike(1, 2) __dead;
189 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) || \
190 !defined(NO_XZ_SUPPORT)
191 static void maybe_errx(const char *fmt, ...) __printflike(1, 2) __dead;
192 #endif
193 static void maybe_warn(const char *fmt, ...) __printflike(1, 2);
194 static void maybe_warnx(const char *fmt, ...) __printflike(1, 2);
195 static enum filetype file_gettype(u_char *);
196 #ifdef SMALL
197 #define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz)
198 #endif
199 static off_t gz_compress(int, int, off_t *, const char *, uint32_t);
200 static off_t gz_uncompress(int, int, char *, size_t, off_t *, const char *);
201 static off_t file_compress(char *, char *, size_t);
202 static off_t file_uncompress(char *, char *, size_t);
203 static void handle_pathname(char *);
204 static void handle_file(char *, struct stat *);
205 static void handle_stdin(void);
206 static void handle_stdout(void);
207 static void print_ratio(off_t, off_t, FILE *);
208 static void print_list(int fd, off_t, const char *, time_t);
209 __dead static void usage(void);
210 __dead static void display_version(void);
211 static const suffixes_t *check_suffix(char *, int);
212 static ssize_t read_retry(int, void *, size_t);
213
214 #ifdef SMALL
215 #define unlink_input(f, sb) unlink(f)
216 #else
217 static off_t cat_fd(unsigned char *, size_t, off_t *, int fd);
218 static void prepend_gzip(char *, int *, char ***);
219 static void handle_dir(char *);
220 static void print_verbage(const char *, const char *, off_t, off_t);
221 static void print_test(const char *, int);
222 static void copymodes(int fd, const struct stat *, const char *file);
223 static int check_outfile(const char *outfile);
224 #endif
225
226 #ifndef NO_BZIP2_SUPPORT
227 static off_t unbzip2(int, int, char *, size_t, off_t *);
228 #endif
229
230 #ifndef NO_COMPRESS_SUPPORT
231 static FILE *zdopen(int);
232 static off_t zuncompress(FILE *, FILE *, char *, size_t, off_t *);
233 #endif
234
235 #ifndef NO_PACK_SUPPORT
236 static off_t unpack(int, int, char *, size_t, off_t *);
237 #endif
238
239 #ifndef NO_XZ_SUPPORT
240 static off_t unxz(int, int, char *, size_t, off_t *);
241 #endif
242
243 #ifdef SMALL
244 #define getopt_long(a,b,c,d,e) getopt(a,b,c)
245 #else
246 static const struct option longopts[] = {
247 { "stdout", no_argument, 0, 'c' },
248 { "to-stdout", no_argument, 0, 'c' },
249 { "decompress", no_argument, 0, 'd' },
250 { "uncompress", no_argument, 0, 'd' },
251 { "force", no_argument, 0, 'f' },
252 { "help", no_argument, 0, 'h' },
253 { "keep", no_argument, 0, 'k' },
254 { "list", no_argument, 0, 'l' },
255 { "no-name", no_argument, 0, 'n' },
256 { "name", no_argument, 0, 'N' },
257 { "quiet", no_argument, 0, 'q' },
258 { "recursive", no_argument, 0, 'r' },
259 { "suffix", required_argument, 0, 'S' },
260 { "test", no_argument, 0, 't' },
261 { "verbose", no_argument, 0, 'v' },
262 { "version", no_argument, 0, 'V' },
263 { "fast", no_argument, 0, '1' },
264 { "best", no_argument, 0, '9' },
265 #if 0
266 /*
267 * This is what else GNU gzip implements. --ascii isn't useful
268 * on NetBSD, and I don't care to have a --license.
269 */
270 { "ascii", no_argument, 0, 'a' },
271 { "license", no_argument, 0, 'L' },
272 #endif
273 { NULL, no_argument, 0, 0 },
274 };
275 #endif
276
277 int
278 main(int argc, char **argv)
279 {
280 const char *progname = getprogname();
281 #ifndef SMALL
282 char *gzip;
283 int len;
284 #endif
285 int ch;
286
287 /* XXX set up signals */
288
289 #ifndef SMALL
290 if ((gzip = getenv("GZIP")) != NULL)
291 prepend_gzip(gzip, &argc, &argv);
292 #endif
293
294 /*
295 * XXX
296 * handle being called `gunzip', `zcat' and `gzcat'
297 */
298 if (strcmp(progname, "gunzip") == 0)
299 dflag = 1;
300 else if (strcmp(progname, "zcat") == 0 ||
301 strcmp(progname, "gzcat") == 0)
302 dflag = cflag = 1;
303
304 #ifdef SMALL
305 #define OPT_LIST "123456789cdhlV"
306 #else
307 #define OPT_LIST "123456789cdfhklNnqrS:tVv"
308 #endif
309
310 while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) {
311 switch (ch) {
312 case '1': case '2': case '3':
313 case '4': case '5': case '6':
314 case '7': case '8': case '9':
315 numflag = ch - '0';
316 break;
317 case 'c':
318 cflag = 1;
319 break;
320 case 'd':
321 dflag = 1;
322 break;
323 case 'l':
324 lflag = 1;
325 dflag = 1;
326 break;
327 case 'V':
328 display_version();
329 /* NOTREACHED */
330 #ifndef SMALL
331 case 'f':
332 fflag = 1;
333 break;
334 case 'k':
335 kflag = 1;
336 break;
337 case 'N':
338 nflag = 0;
339 Nflag = 1;
340 break;
341 case 'n':
342 nflag = 1;
343 Nflag = 0;
344 break;
345 case 'q':
346 qflag = 1;
347 break;
348 case 'r':
349 rflag = 1;
350 break;
351 case 'S':
352 len = strlen(optarg);
353 if (len != 0) {
354 if (len > SUFFIX_MAXLEN)
355 errx(1, "incorrect suffix: '%s'", optarg);
356 suffixes[0].zipped = optarg;
357 suffixes[0].ziplen = len;
358 } else {
359 suffixes[NUM_SUFFIXES - 1].zipped = "";
360 suffixes[NUM_SUFFIXES - 1].ziplen = 0;
361 }
362 break;
363 case 't':
364 cflag = 1;
365 tflag = 1;
366 dflag = 1;
367 break;
368 case 'v':
369 vflag = 1;
370 break;
371 #endif
372 default:
373 usage();
374 /* NOTREACHED */
375 }
376 }
377 argv += optind;
378 argc -= optind;
379
380 if (argc == 0) {
381 if (dflag) /* stdin mode */
382 handle_stdin();
383 else /* stdout mode */
384 handle_stdout();
385 } else {
386 do {
387 handle_pathname(argv[0]);
388 } while (*++argv);
389 }
390 #ifndef SMALL
391 if (qflag == 0 && lflag && argc > 1)
392 print_list(-1, 0, "(totals)", 0);
393 #endif
394 exit(exit_value);
395 }
396
397 /* maybe print a warning */
398 void
399 maybe_warn(const char *fmt, ...)
400 {
401 va_list ap;
402
403 if (qflag == 0) {
404 va_start(ap, fmt);
405 vwarn(fmt, ap);
406 va_end(ap);
407 }
408 if (exit_value == 0)
409 exit_value = 1;
410 }
411
412 /* ... without an errno. */
413 void
414 maybe_warnx(const char *fmt, ...)
415 {
416 va_list ap;
417
418 if (qflag == 0) {
419 va_start(ap, fmt);
420 vwarnx(fmt, ap);
421 va_end(ap);
422 }
423 if (exit_value == 0)
424 exit_value = 1;
425 }
426
427 /* maybe print an error */
428 void
429 maybe_err(const char *fmt, ...)
430 {
431 va_list ap;
432
433 if (qflag == 0) {
434 va_start(ap, fmt);
435 vwarn(fmt, ap);
436 va_end(ap);
437 }
438 exit(2);
439 }
440
441 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) || \
442 !defined(NO_XZ_SUPPORT)
443 /* ... without an errno. */
444 void
445 maybe_errx(const char *fmt, ...)
446 {
447 va_list ap;
448
449 if (qflag == 0) {
450 va_start(ap, fmt);
451 vwarnx(fmt, ap);
452 va_end(ap);
453 }
454 exit(2);
455 }
456 #endif
457
458 #ifndef SMALL
459 /* split up $GZIP and prepend it to the argument list */
460 static void
461 prepend_gzip(char *gzip, int *argc, char ***argv)
462 {
463 char *s, **nargv, **ac;
464 int nenvarg = 0, i;
465
466 /* scan how many arguments there are */
467 for (s = gzip;;) {
468 while (*s == ' ' || *s == '\t')
469 s++;
470 if (*s == 0)
471 goto count_done;
472 nenvarg++;
473 while (*s != ' ' && *s != '\t')
474 if (*s++ == 0)
475 goto count_done;
476 }
477 count_done:
478 /* punt early */
479 if (nenvarg == 0)
480 return;
481
482 *argc += nenvarg;
483 ac = *argv;
484
485 nargv = (char **)malloc((*argc + 1) * sizeof(char *));
486 if (nargv == NULL)
487 maybe_err("malloc");
488
489 /* stash this away */
490 *argv = nargv;
491
492 /* copy the program name first */
493 i = 0;
494 nargv[i++] = *(ac++);
495
496 /* take a copy of $GZIP and add it to the array */
497 s = strdup(gzip);
498 if (s == NULL)
499 maybe_err("strdup");
500 for (;;) {
501 /* Skip whitespaces. */
502 while (*s == ' ' || *s == '\t')
503 s++;
504 if (*s == 0)
505 goto copy_done;
506 nargv[i++] = s;
507 /* Find the end of this argument. */
508 while (*s != ' ' && *s != '\t')
509 if (*s++ == 0)
510 /* Argument followed by NUL. */
511 goto copy_done;
512 /* Terminate by overwriting ' ' or '\t' with NUL. */
513 *s++ = 0;
514 }
515 copy_done:
516
517 /* copy the original arguments and a NULL */
518 while (*ac)
519 nargv[i++] = *(ac++);
520 nargv[i] = NULL;
521 }
522 #endif
523
524 /* compress input to output. Return bytes read, -1 on error */
525 static off_t
526 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime)
527 {
528 z_stream z;
529 char *outbufp, *inbufp;
530 off_t in_tot = 0, out_tot = 0;
531 ssize_t in_size;
532 int i, error;
533 uLong crc;
534 #ifdef SMALL
535 static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0,
536 0, 0, 0, 0,
537 0, OS_CODE };
538 #endif
539
540 outbufp = malloc(BUFLEN);
541 inbufp = malloc(BUFLEN);
542 if (outbufp == NULL || inbufp == NULL) {
543 maybe_err("malloc failed");
544 goto out;
545 }
546
547 memset(&z, 0, sizeof z);
548 z.zalloc = Z_NULL;
549 z.zfree = Z_NULL;
550 z.opaque = 0;
551
552 #ifdef SMALL
553 memcpy(outbufp, header, sizeof header);
554 i = sizeof header;
555 #else
556 if (nflag != 0) {
557 mtime = 0;
558 origname = "";
559 }
560
561 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s",
562 GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED,
563 *origname ? ORIG_NAME : 0,
564 mtime & 0xff,
565 (mtime >> 8) & 0xff,
566 (mtime >> 16) & 0xff,
567 (mtime >> 24) & 0xff,
568 numflag == 1 ? 4 : numflag == 9 ? 2 : 0,
569 OS_CODE, origname);
570 if (i >= BUFLEN)
571 /* this need PATH_MAX > BUFLEN ... */
572 maybe_err("snprintf");
573 if (*origname)
574 i++;
575 #endif
576
577 z.next_out = (unsigned char *)outbufp + i;
578 z.avail_out = BUFLEN - i;
579
580 error = deflateInit2(&z, numflag, Z_DEFLATED,
581 (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY);
582 if (error != Z_OK) {
583 maybe_warnx("deflateInit2 failed");
584 in_tot = -1;
585 goto out;
586 }
587
588 crc = crc32(0L, Z_NULL, 0);
589 for (;;) {
590 if (z.avail_out == 0) {
591 if (write(out, outbufp, BUFLEN) != BUFLEN) {
592 maybe_warn("write");
593 out_tot = -1;
594 goto out;
595 }
596
597 out_tot += BUFLEN;
598 z.next_out = (unsigned char *)outbufp;
599 z.avail_out = BUFLEN;
600 }
601
602 if (z.avail_in == 0) {
603 in_size = read(in, inbufp, BUFLEN);
604 if (in_size < 0) {
605 maybe_warn("read");
606 in_tot = -1;
607 goto out;
608 }
609 if (in_size == 0)
610 break;
611
612 crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size);
613 in_tot += in_size;
614 z.next_in = (unsigned char *)inbufp;
615 z.avail_in = in_size;
616 }
617
618 error = deflate(&z, Z_NO_FLUSH);
619 if (error != Z_OK && error != Z_STREAM_END) {
620 maybe_warnx("deflate failed");
621 in_tot = -1;
622 goto out;
623 }
624 }
625
626 /* clean up */
627 for (;;) {
628 size_t len;
629 ssize_t w;
630
631 error = deflate(&z, Z_FINISH);
632 if (error != Z_OK && error != Z_STREAM_END) {
633 maybe_warnx("deflate failed");
634 in_tot = -1;
635 goto out;
636 }
637
638 len = (char *)z.next_out - outbufp;
639
640 w = write(out, outbufp, len);
641 if (w == -1 || (size_t)w != len) {
642 maybe_warn("write");
643 out_tot = -1;
644 goto out;
645 }
646 out_tot += len;
647 z.next_out = (unsigned char *)outbufp;
648 z.avail_out = BUFLEN;
649
650 if (error == Z_STREAM_END)
651 break;
652 }
653
654 if (deflateEnd(&z) != Z_OK) {
655 maybe_warnx("deflateEnd failed");
656 in_tot = -1;
657 goto out;
658 }
659
660 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c",
661 (int)crc & 0xff,
662 (int)(crc >> 8) & 0xff,
663 (int)(crc >> 16) & 0xff,
664 (int)(crc >> 24) & 0xff,
665 (int)in_tot & 0xff,
666 (int)(in_tot >> 8) & 0xff,
667 (int)(in_tot >> 16) & 0xff,
668 (int)(in_tot >> 24) & 0xff);
669 if (i != 8)
670 maybe_err("snprintf");
671 #if 0
672 if (in_tot > 0xffffffff)
673 maybe_warn("input file size >= 4GB cannot be saved");
674 #endif
675 if (write(out, outbufp, i) != i) {
676 maybe_warn("write");
677 in_tot = -1;
678 } else
679 out_tot += i;
680
681 out:
682 if (inbufp != NULL)
683 free(inbufp);
684 if (outbufp != NULL)
685 free(outbufp);
686 if (gsizep)
687 *gsizep = out_tot;
688 return in_tot;
689 }
690
691 /*
692 * uncompress input to output then close the input. return the
693 * uncompressed size written, and put the compressed sized read
694 * into `*gsizep'.
695 */
696 static off_t
697 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
698 const char *filename)
699 {
700 z_stream z;
701 char *outbufp, *inbufp;
702 off_t out_tot = -1, in_tot = 0;
703 uint32_t out_sub_tot = 0;
704 enum {
705 GZSTATE_MAGIC0,
706 GZSTATE_MAGIC1,
707 GZSTATE_METHOD,
708 GZSTATE_FLAGS,
709 GZSTATE_SKIPPING,
710 GZSTATE_EXTRA,
711 GZSTATE_EXTRA2,
712 GZSTATE_EXTRA3,
713 GZSTATE_ORIGNAME,
714 GZSTATE_COMMENT,
715 GZSTATE_HEAD_CRC1,
716 GZSTATE_HEAD_CRC2,
717 GZSTATE_INIT,
718 GZSTATE_READ,
719 GZSTATE_CRC,
720 GZSTATE_LEN,
721 } state = GZSTATE_MAGIC0;
722 int flags = 0, skip_count = 0;
723 int error = Z_STREAM_ERROR, done_reading = 0;
724 uLong crc = 0;
725 ssize_t wr;
726 int needmore = 0;
727
728 #define ADVANCE() { z.next_in++; z.avail_in--; }
729
730 if ((outbufp = malloc(BUFLEN)) == NULL) {
731 maybe_err("malloc failed");
732 goto out2;
733 }
734 if ((inbufp = malloc(BUFLEN)) == NULL) {
735 maybe_err("malloc failed");
736 goto out1;
737 }
738
739 memset(&z, 0, sizeof z);
740 z.avail_in = prelen;
741 z.next_in = (unsigned char *)pre;
742 z.avail_out = BUFLEN;
743 z.next_out = (unsigned char *)outbufp;
744 z.zalloc = NULL;
745 z.zfree = NULL;
746 z.opaque = 0;
747
748 in_tot = prelen;
749 out_tot = 0;
750
751 for (;;) {
752 if ((z.avail_in == 0 || needmore) && done_reading == 0) {
753 ssize_t in_size;
754
755 if (z.avail_in > 0) {
756 memmove(inbufp, z.next_in, z.avail_in);
757 }
758 z.next_in = (unsigned char *)inbufp;
759 in_size = read(in, z.next_in + z.avail_in,
760 BUFLEN - z.avail_in);
761
762 if (in_size == -1) {
763 maybe_warn("failed to read stdin");
764 goto stop_and_fail;
765 } else if (in_size == 0) {
766 done_reading = 1;
767 }
768
769 z.avail_in += in_size;
770 needmore = 0;
771
772 in_tot += in_size;
773 }
774 if (z.avail_in == 0) {
775 if (done_reading && state != GZSTATE_MAGIC0) {
776 maybe_warnx("%s: unexpected end of file",
777 filename);
778 goto stop_and_fail;
779 }
780 goto stop;
781 }
782 switch (state) {
783 case GZSTATE_MAGIC0:
784 if (*z.next_in != GZIP_MAGIC0) {
785 if (in_tot > 0) {
786 maybe_warnx("%s: trailing garbage "
787 "ignored", filename);
788 goto stop;
789 }
790 maybe_warnx("input not gziped (MAGIC0)");
791 goto stop_and_fail;
792 }
793 ADVANCE();
794 state++;
795 out_sub_tot = 0;
796 crc = crc32(0L, Z_NULL, 0);
797 break;
798
799 case GZSTATE_MAGIC1:
800 if (*z.next_in != GZIP_MAGIC1 &&
801 *z.next_in != GZIP_OMAGIC1) {
802 maybe_warnx("input not gziped (MAGIC1)");
803 goto stop_and_fail;
804 }
805 ADVANCE();
806 state++;
807 break;
808
809 case GZSTATE_METHOD:
810 if (*z.next_in != Z_DEFLATED) {
811 maybe_warnx("unknown compression method");
812 goto stop_and_fail;
813 }
814 ADVANCE();
815 state++;
816 break;
817
818 case GZSTATE_FLAGS:
819 flags = *z.next_in;
820 ADVANCE();
821 skip_count = 6;
822 state++;
823 break;
824
825 case GZSTATE_SKIPPING:
826 if (skip_count > 0) {
827 skip_count--;
828 ADVANCE();
829 } else
830 state++;
831 break;
832
833 case GZSTATE_EXTRA:
834 if ((flags & EXTRA_FIELD) == 0) {
835 state = GZSTATE_ORIGNAME;
836 break;
837 }
838 skip_count = *z.next_in;
839 ADVANCE();
840 state++;
841 break;
842
843 case GZSTATE_EXTRA2:
844 skip_count |= ((*z.next_in) << 8);
845 ADVANCE();
846 state++;
847 break;
848
849 case GZSTATE_EXTRA3:
850 if (skip_count > 0) {
851 skip_count--;
852 ADVANCE();
853 } else
854 state++;
855 break;
856
857 case GZSTATE_ORIGNAME:
858 if ((flags & ORIG_NAME) == 0) {
859 state++;
860 break;
861 }
862 if (*z.next_in == 0)
863 state++;
864 ADVANCE();
865 break;
866
867 case GZSTATE_COMMENT:
868 if ((flags & COMMENT) == 0) {
869 state++;
870 break;
871 }
872 if (*z.next_in == 0)
873 state++;
874 ADVANCE();
875 break;
876
877 case GZSTATE_HEAD_CRC1:
878 if (flags & HEAD_CRC)
879 skip_count = 2;
880 else
881 skip_count = 0;
882 state++;
883 break;
884
885 case GZSTATE_HEAD_CRC2:
886 if (skip_count > 0) {
887 skip_count--;
888 ADVANCE();
889 } else
890 state++;
891 break;
892
893 case GZSTATE_INIT:
894 if (inflateInit2(&z, -MAX_WBITS) != Z_OK) {
895 maybe_warnx("failed to inflateInit");
896 goto stop_and_fail;
897 }
898 state++;
899 break;
900
901 case GZSTATE_READ:
902 error = inflate(&z, Z_FINISH);
903 switch (error) {
904 /* Z_BUF_ERROR goes with Z_FINISH... */
905 case Z_BUF_ERROR:
906 if (z.avail_out > 0 && !done_reading)
907 continue;
908
909 case Z_STREAM_END:
910 case Z_OK:
911 break;
912
913 case Z_NEED_DICT:
914 maybe_warnx("Z_NEED_DICT error");
915 goto stop_and_fail;
916 case Z_DATA_ERROR:
917 maybe_warnx("data stream error");
918 goto stop_and_fail;
919 case Z_STREAM_ERROR:
920 maybe_warnx("internal stream error");
921 goto stop_and_fail;
922 case Z_MEM_ERROR:
923 maybe_warnx("memory allocation error");
924 goto stop_and_fail;
925
926 default:
927 maybe_warn("unknown error from inflate(): %d",
928 error);
929 }
930 wr = BUFLEN - z.avail_out;
931
932 if (wr != 0) {
933 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr);
934 if (
935 #ifndef SMALL
936 /* don't write anything with -t */
937 tflag == 0 &&
938 #endif
939 write(out, outbufp, wr) != wr) {
940 maybe_warn("error writing to output");
941 goto stop_and_fail;
942 }
943
944 out_tot += wr;
945 out_sub_tot += wr;
946 }
947
948 if (error == Z_STREAM_END) {
949 inflateEnd(&z);
950 state++;
951 }
952
953 z.next_out = (unsigned char *)outbufp;
954 z.avail_out = BUFLEN;
955
956 break;
957 case GZSTATE_CRC:
958 {
959 uLong origcrc;
960
961 if (z.avail_in < 4) {
962 if (!done_reading) {
963 needmore = 1;
964 continue;
965 }
966 maybe_warnx("truncated input");
967 goto stop_and_fail;
968 }
969 origcrc = ((unsigned)z.next_in[0] & 0xff) |
970 ((unsigned)z.next_in[1] & 0xff) << 8 |
971 ((unsigned)z.next_in[2] & 0xff) << 16 |
972 ((unsigned)z.next_in[3] & 0xff) << 24;
973 if (origcrc != crc) {
974 maybe_warnx("invalid compressed"
975 " data--crc error");
976 goto stop_and_fail;
977 }
978 }
979
980 z.avail_in -= 4;
981 z.next_in += 4;
982
983 if (!z.avail_in && done_reading) {
984 goto stop;
985 }
986 state++;
987 break;
988 case GZSTATE_LEN:
989 {
990 uLong origlen;
991
992 if (z.avail_in < 4) {
993 if (!done_reading) {
994 needmore = 1;
995 continue;
996 }
997 maybe_warnx("truncated input");
998 goto stop_and_fail;
999 }
1000 origlen = ((unsigned)z.next_in[0] & 0xff) |
1001 ((unsigned)z.next_in[1] & 0xff) << 8 |
1002 ((unsigned)z.next_in[2] & 0xff) << 16 |
1003 ((unsigned)z.next_in[3] & 0xff) << 24;
1004
1005 if (origlen != out_sub_tot) {
1006 maybe_warnx("invalid compressed"
1007 " data--length error");
1008 goto stop_and_fail;
1009 }
1010 }
1011
1012 z.avail_in -= 4;
1013 z.next_in += 4;
1014
1015 if (error < 0) {
1016 maybe_warnx("decompression error");
1017 goto stop_and_fail;
1018 }
1019 state = GZSTATE_MAGIC0;
1020 break;
1021 }
1022 continue;
1023 stop_and_fail:
1024 out_tot = -1;
1025 stop:
1026 break;
1027 }
1028 if (state > GZSTATE_INIT)
1029 inflateEnd(&z);
1030
1031 free(inbufp);
1032 out1:
1033 free(outbufp);
1034 out2:
1035 if (gsizep)
1036 *gsizep = in_tot;
1037 return (out_tot);
1038 }
1039
1040 #ifndef SMALL
1041 /*
1042 * set the owner, mode, flags & utimes using the given file descriptor.
1043 * file is only used in possible warning messages.
1044 */
1045 static void
1046 copymodes(int fd, const struct stat *sbp, const char *file)
1047 {
1048 struct timeval times[2];
1049 struct stat sb;
1050
1051 /*
1052 * If we have no info on the input, give this file some
1053 * default values and return..
1054 */
1055 if (sbp == NULL) {
1056 mode_t mask = umask(022);
1057
1058 (void)fchmod(fd, DEFFILEMODE & ~mask);
1059 (void)umask(mask);
1060 return;
1061 }
1062 sb = *sbp;
1063
1064 /* if the chown fails, remove set-id bits as-per compress(1) */
1065 if (fchown(fd, sb.st_uid, sb.st_gid) < 0) {
1066 if (errno != EPERM)
1067 maybe_warn("couldn't fchown: %s", file);
1068 sb.st_mode &= ~(S_ISUID|S_ISGID);
1069 }
1070
1071 /* we only allow set-id and the 9 normal permission bits */
1072 sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
1073 if (fchmod(fd, sb.st_mode) < 0)
1074 maybe_warn("couldn't fchmod: %s", file);
1075
1076 /* only try flags if they exist already */
1077 #ifndef __minix
1078 if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0)
1079 maybe_warn("couldn't fchflags: %s", file);
1080 #endif
1081
1082 TIMESPEC_TO_TIMEVAL(&times[0], &sb.st_atimespec);
1083 TIMESPEC_TO_TIMEVAL(&times[1], &sb.st_mtimespec);
1084 #ifndef __minix
1085 if (futimes(fd, times) < 0)
1086 maybe_warn("couldn't utimes: %s", file);
1087 #endif
1088 }
1089 #endif
1090
1091 /* what sort of file is this? */
1092 static enum filetype
1093 file_gettype(u_char *buf)
1094 {
1095
1096 if (buf[0] == GZIP_MAGIC0 &&
1097 (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
1098 return FT_GZIP;
1099 else
1100 #ifndef NO_BZIP2_SUPPORT
1101 if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
1102 buf[3] >= '0' && buf[3] <= '9')
1103 return FT_BZIP2;
1104 else
1105 #endif
1106 #ifndef NO_COMPRESS_SUPPORT
1107 if (memcmp(buf, Z_MAGIC, 2) == 0)
1108 return FT_Z;
1109 else
1110 #endif
1111 #ifndef NO_PACK_SUPPORT
1112 if (memcmp(buf, PACK_MAGIC, 2) == 0)
1113 return FT_PACK;
1114 else
1115 #endif
1116 #ifndef NO_XZ_SUPPORT
1117 if (memcmp(buf, XZ_MAGIC, 4) == 0) /* XXX: We only have 4 bytes */
1118 return FT_XZ;
1119 else
1120 #endif
1121 return FT_UNKNOWN;
1122 }
1123
1124 #ifndef SMALL
1125 /* check the outfile is OK. */
1126 static int
1127 check_outfile(const char *outfile)
1128 {
1129 struct stat sb;
1130 int ok = 1;
1131
1132 if (lflag == 0 && stat(outfile, &sb) == 0) {
1133 if (fflag)
1134 unlink(outfile);
1135 else if (isatty(STDIN_FILENO)) {
1136 char ans[10] = { 'n', '\0' }; /* default */
1137
1138 fprintf(stderr, "%s already exists -- do you wish to "
1139 "overwrite (y or n)? " , outfile);
1140 (void)fgets(ans, sizeof(ans) - 1, stdin);
1141 if (ans[0] != 'y' && ans[0] != 'Y') {
1142 fprintf(stderr, "\tnot overwriting\n");
1143 ok = 0;
1144 } else
1145 unlink(outfile);
1146 } else {
1147 maybe_warnx("%s already exists -- skipping", outfile);
1148 ok = 0;
1149 }
1150 }
1151 return ok;
1152 }
1153
1154 static void
1155 unlink_input(const char *file, const struct stat *sb)
1156 {
1157 struct stat nsb;
1158
1159 if (kflag)
1160 return;
1161 if (stat(file, &nsb) != 0)
1162 /* Must be gone already */
1163 return;
1164 if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
1165 /* Definitely a different file */
1166 return;
1167 unlink(file);
1168 }
1169 #endif
1170
1171 static const suffixes_t *
1172 check_suffix(char *file, int xlate)
1173 {
1174 const suffixes_t *s;
1175 int len = strlen(file);
1176 char *sp;
1177
1178 for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
1179 /* if it doesn't fit in "a.suf", don't bother */
1180 if (s->ziplen >= len)
1181 continue;
1182 sp = file + len - s->ziplen;
1183 if (strcmp(s->zipped, sp) != 0)
1184 continue;
1185 if (xlate)
1186 strcpy(sp, s->normal);
1187 return s;
1188 }
1189 return NULL;
1190 }
1191
1192 /*
1193 * compress the given file: create a corresponding .gz file and remove the
1194 * original.
1195 */
1196 static off_t
1197 file_compress(char *file, char *outfile, size_t outsize)
1198 {
1199 int in;
1200 int out;
1201 off_t size, insize;
1202 #ifndef SMALL
1203 struct stat isb, osb;
1204 const suffixes_t *suff;
1205 #endif
1206
1207 in = open(file, O_RDONLY);
1208 if (in == -1) {
1209 maybe_warn("can't open %s", file);
1210 return -1;
1211 }
1212
1213 if (cflag == 0) {
1214 #ifndef SMALL
1215 if (fstat(in, &isb) == 0) {
1216 if (isb.st_nlink > 1 && fflag == 0) {
1217 maybe_warnx("%s has %d other link%s -- "
1218 "skipping", file, isb.st_nlink - 1,
1219 isb.st_nlink == 1 ? "" : "s");
1220 close(in);
1221 return -1;
1222 }
1223 }
1224
1225 if (fflag == 0 && (suff = check_suffix(file, 0))
1226 && suff->zipped[0] != 0) {
1227 maybe_warnx("%s already has %s suffix -- unchanged",
1228 file, suff->zipped);
1229 close(in);
1230 return -1;
1231 }
1232 #endif
1233
1234 /* Add (usually) .gz to filename */
1235 if ((size_t)snprintf(outfile, outsize, "%s%s",
1236 file, suffixes[0].zipped) >= outsize)
1237 memcpy(outfile + outsize - suffixes[0].ziplen - 1,
1238 suffixes[0].zipped, suffixes[0].ziplen + 1);
1239
1240 #ifndef SMALL
1241 if (check_outfile(outfile) == 0) {
1242 close(in);
1243 return -1;
1244 }
1245 #endif
1246 }
1247
1248 if (cflag == 0) {
1249 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
1250 if (out == -1) {
1251 maybe_warn("could not create output: %s", outfile);
1252 fclose(stdin);
1253 return -1;
1254 }
1255 } else
1256 out = STDOUT_FILENO;
1257
1258 insize = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
1259
1260 (void)close(in);
1261
1262 /*
1263 * If there was an error, insize will be -1.
1264 * If we compressed to stdout, just return the size.
1265 * Otherwise stat the file and check it is the correct size.
1266 * We only blow away the file if we can stat the output and it
1267 * has the expected size.
1268 */
1269 if (cflag != 0)
1270 return insize == -1 ? -1 : size;
1271
1272 #ifndef SMALL
1273 if (fstat(out, &osb) != 0) {
1274 maybe_warn("couldn't stat: %s", outfile);
1275 goto bad_outfile;
1276 }
1277
1278 if (osb.st_size != size) {
1279 maybe_warnx("output file: %s wrong size (%" PRIdOFF
1280 " != %" PRIdOFF "), deleting",
1281 #ifndef __minix
1282 outfile, osb.st_size, size);
1283 #else
1284 outfile, osb.st_size, (big_off_t)size);
1285 #endif
1286 goto bad_outfile;
1287 }
1288
1289 copymodes(out, &isb, outfile);
1290 #endif
1291 if (close(out) == -1)
1292 maybe_warn("couldn't close output");
1293
1294 /* output is good, ok to delete input */
1295 unlink_input(file, &isb);
1296 return size;
1297
1298 #ifndef SMALL
1299 bad_outfile:
1300 if (close(out) == -1)
1301 maybe_warn("couldn't close output");
1302
1303 maybe_warnx("leaving original %s", file);
1304 unlink(outfile);
1305 return size;
1306 #endif
1307 }
1308
1309 /* uncompress the given file and remove the original */
1310 static off_t
1311 file_uncompress(char *file, char *outfile, size_t outsize)
1312 {
1313 struct stat isb, osb;
1314 off_t size;
1315 ssize_t rbytes;
1316 unsigned char header1[4];
1317 enum filetype method;
1318 int fd, ofd, zfd = -1;
1319 #ifndef SMALL
1320 ssize_t rv;
1321 time_t timestamp = 0;
1322 unsigned char name[PATH_MAX + 1];
1323 #endif
1324
1325 /* gather the old name info */
1326
1327 fd = open(file, O_RDONLY);
1328 if (fd < 0) {
1329 maybe_warn("can't open %s", file);
1330 goto lose;
1331 }
1332
1333 strlcpy(outfile, file, outsize);
1334 if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
1335 maybe_warnx("%s: unknown suffix -- ignored", file);
1336 goto lose;
1337 }
1338
1339 rbytes = read(fd, header1, sizeof header1);
1340 if (rbytes != sizeof header1) {
1341 /* we don't want to fail here. */
1342 #ifndef SMALL
1343 if (fflag)
1344 goto lose;
1345 #endif
1346 if (rbytes == -1)
1347 maybe_warn("can't read %s", file);
1348 else
1349 goto unexpected_EOF;
1350 goto lose;
1351 }
1352
1353 method = file_gettype(header1);
1354 #ifndef SMALL
1355 if (fflag == 0 && method == FT_UNKNOWN) {
1356 maybe_warnx("%s: not in gzip format", file);
1357 goto lose;
1358 }
1359
1360 #endif
1361
1362 #ifndef SMALL
1363 if (method == FT_GZIP && Nflag) {
1364 unsigned char ts[4]; /* timestamp */
1365
1366 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP);
1367 if (rv >= 0 && rv < (ssize_t)(sizeof ts))
1368 goto unexpected_EOF;
1369 if (rv == -1) {
1370 if (!fflag)
1371 maybe_warn("can't read %s", file);
1372 goto lose;
1373 }
1374 timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0];
1375
1376 if (header1[3] & ORIG_NAME) {
1377 rbytes = pread(fd, name, sizeof name, GZIP_ORIGNAME);
1378 if (rbytes < 0) {
1379 maybe_warn("can't read %s", file);
1380 goto lose;
1381 }
1382 if (name[0] != 0) {
1383 /* preserve original directory name */
1384 char *dp = strrchr(file, '/');
1385 if (dp == NULL)
1386 dp = file;
1387 else
1388 dp++;
1389 snprintf(outfile, outsize, "%.*s%.*s",
1390 (int) (dp - file),
1391 file, (int) rbytes, name);
1392 }
1393 }
1394 }
1395 #endif
1396 lseek(fd, 0, SEEK_SET);
1397
1398 if (cflag == 0 || lflag) {
1399 if (fstat(fd, &isb) != 0)
1400 goto lose;
1401 #ifndef SMALL
1402 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
1403 maybe_warnx("%s has %d other links -- skipping",
1404 file, isb.st_nlink - 1);
1405 goto lose;
1406 }
1407 if (nflag == 0 && timestamp)
1408 isb.st_mtime = timestamp;
1409 if (check_outfile(outfile) == 0)
1410 goto lose;
1411 #endif
1412 }
1413
1414 if (cflag == 0 && lflag == 0) {
1415 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
1416 if (zfd == STDOUT_FILENO) {
1417 /* We won't close STDOUT_FILENO later... */
1418 zfd = dup(zfd);
1419 close(STDOUT_FILENO);
1420 }
1421 if (zfd == -1) {
1422 maybe_warn("can't open %s", outfile);
1423 goto lose;
1424 }
1425 } else
1426 zfd = STDOUT_FILENO;
1427
1428 switch (method) {
1429 #ifndef NO_BZIP2_SUPPORT
1430 case FT_BZIP2:
1431 /* XXX */
1432 if (lflag) {
1433 maybe_warnx("no -l with bzip2 files");
1434 goto lose;
1435 }
1436
1437 size = unbzip2(fd, zfd, NULL, 0, NULL);
1438 break;
1439 #endif
1440
1441 #ifndef NO_COMPRESS_SUPPORT
1442 case FT_Z: {
1443 FILE *in, *out;
1444
1445 /* XXX */
1446 if (lflag) {
1447 maybe_warnx("no -l with Lempel-Ziv files");
1448 goto lose;
1449 }
1450
1451 if ((in = zdopen(fd)) == NULL) {
1452 maybe_warn("zdopen for read: %s", file);
1453 goto lose;
1454 }
1455
1456 out = fdopen(dup(zfd), "w");
1457 if (out == NULL) {
1458 maybe_warn("fdopen for write: %s", outfile);
1459 fclose(in);
1460 goto lose;
1461 }
1462
1463 size = zuncompress(in, out, NULL, 0, NULL);
1464 /* need to fclose() if ferror() is true... */
1465 if (ferror(in) | fclose(in)) {
1466 maybe_warn("failed infile fclose");
1467 unlink(outfile);
1468 (void)fclose(out);
1469 }
1470 if (fclose(out) != 0) {
1471 maybe_warn("failed outfile fclose");
1472 unlink(outfile);
1473 goto lose;
1474 }
1475 break;
1476 }
1477 #endif
1478
1479 #ifndef NO_PACK_SUPPORT
1480 case FT_PACK:
1481 if (lflag) {
1482 maybe_warnx("no -l with packed files");
1483 goto lose;
1484 }
1485
1486 size = unpack(fd, zfd, NULL, 0, NULL);
1487 break;
1488 #endif
1489
1490 #ifndef NO_XZ_SUPPORT
1491 case FT_XZ:
1492 if (lflag) {
1493 maybe_warnx("no -l with xz files");
1494 goto lose;
1495 }
1496
1497 size = unxz(fd, zfd, NULL, 0, NULL);
1498 break;
1499 #endif
1500
1501 #ifndef SMALL
1502 case FT_UNKNOWN:
1503 if (lflag) {
1504 maybe_warnx("no -l for unknown filetypes");
1505 goto lose;
1506 }
1507 size = cat_fd(NULL, 0, NULL, fd);
1508 break;
1509 #endif
1510 default:
1511 if (lflag) {
1512 print_list(fd, isb.st_size, outfile, isb.st_mtime);
1513 close(fd);
1514 return -1; /* XXX */
1515 }
1516
1517 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
1518 break;
1519 }
1520
1521 if (close(fd) != 0)
1522 maybe_warn("couldn't close input");
1523 if (zfd != STDOUT_FILENO && close(zfd) != 0)
1524 maybe_warn("couldn't close output");
1525
1526 if (size == -1) {
1527 if (cflag == 0)
1528 unlink(outfile);
1529 maybe_warnx("%s: uncompress failed", file);
1530 return -1;
1531 }
1532
1533 /* if testing, or we uncompressed to stdout, this is all we need */
1534 #ifndef SMALL
1535 if (tflag)
1536 return size;
1537 #endif
1538 /* if we are uncompressing to stdin, don't remove the file. */
1539 if (cflag)
1540 return size;
1541
1542 /*
1543 * if we create a file...
1544 */
1545 /*
1546 * if we can't stat the file don't remove the file.
1547 */
1548
1549 ofd = open(outfile, O_RDWR, 0);
1550 if (ofd == -1) {
1551 maybe_warn("couldn't open (leaving original): %s",
1552 outfile);
1553 return -1;
1554 }
1555 if (fstat(ofd, &osb) != 0) {
1556 maybe_warn("couldn't stat (leaving original): %s",
1557 outfile);
1558 close(ofd);
1559 return -1;
1560 }
1561 if (osb.st_size != size) {
1562 maybe_warnx("stat gave different size: %" PRIdOFF
1563 " != %" PRIdOFF " (leaving original)",
1564 #ifndef __minix
1565 size, osb.st_size);
1566 #else
1567 (big_off_t)size, osb.st_size);
1568 #endif
1569 close(ofd);
1570 unlink(outfile);
1571 return -1;
1572 }
1573 unlink_input(file, &isb);
1574 #ifndef SMALL
1575 copymodes(ofd, &isb, outfile);
1576 #endif
1577 close(ofd);
1578 return size;
1579
1580 unexpected_EOF:
1581 maybe_warnx("%s: unexpected end of file", file);
1582 lose:
1583 if (fd != -1)
1584 close(fd);
1585 if (zfd != -1 && zfd != STDOUT_FILENO)
1586 close(fd);
1587 return -1;
1588 }
1589
1590 #ifndef SMALL
1591 static off_t
1592 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd)
1593 {
1594 char buf[BUFLEN];
1595 off_t in_tot;
1596 ssize_t w;
1597
1598 in_tot = count;
1599 w = write(STDOUT_FILENO, prepend, count);
1600 if (w == -1 || (size_t)w != count) {
1601 maybe_warn("write to stdout");
1602 return -1;
1603 }
1604 for (;;) {
1605 ssize_t rv;
1606
1607 rv = read(fd, buf, sizeof buf);
1608 if (rv == 0)
1609 break;
1610 if (rv < 0) {
1611 maybe_warn("read from fd %d", fd);
1612 break;
1613 }
1614
1615 if (write(STDOUT_FILENO, buf, rv) != rv) {
1616 maybe_warn("write to stdout");
1617 break;
1618 }
1619 in_tot += rv;
1620 }
1621
1622 if (gsizep)
1623 *gsizep = in_tot;
1624 return (in_tot);
1625 }
1626 #endif
1627
1628 static void
1629 handle_stdin(void)
1630 {
1631 unsigned char header1[4];
1632 off_t usize, gsize;
1633 enum filetype method;
1634 ssize_t bytes_read;
1635 #ifndef NO_COMPRESS_SUPPORT
1636 FILE *in;
1637 #endif
1638
1639 #ifndef SMALL
1640 if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
1641 maybe_warnx("standard input is a terminal -- ignoring");
1642 return;
1643 }
1644 #endif
1645
1646 if (lflag) {
1647 struct stat isb;
1648
1649 /* XXX could read the whole file, etc. */
1650 if (fstat(STDIN_FILENO, &isb) < 0) {
1651 maybe_warn("fstat");
1652 return;
1653 }
1654 print_list(STDIN_FILENO, isb.st_size, "stdout", isb.st_mtime);
1655 return;
1656 }
1657
1658 bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1);
1659 if (bytes_read == -1) {
1660 maybe_warn("can't read stdin");
1661 return;
1662 } else if (bytes_read != sizeof(header1)) {
1663 maybe_warnx("(stdin): unexpected end of file");
1664 return;
1665 }
1666
1667 method = file_gettype(header1);
1668 switch (method) {
1669 default:
1670 #ifndef SMALL
1671 if (fflag == 0) {
1672 maybe_warnx("unknown compression format");
1673 return;
1674 }
1675 usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO);
1676 break;
1677 #endif
1678 case FT_GZIP:
1679 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
1680 (char *)header1, sizeof header1, &gsize, "(stdin)");
1681 break;
1682 #ifndef NO_BZIP2_SUPPORT
1683 case FT_BZIP2:
1684 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
1685 (char *)header1, sizeof header1, &gsize);
1686 break;
1687 #endif
1688 #ifndef NO_COMPRESS_SUPPORT
1689 case FT_Z:
1690 if ((in = zdopen(STDIN_FILENO)) == NULL) {
1691 maybe_warnx("zopen of stdin");
1692 return;
1693 }
1694
1695 usize = zuncompress(in, stdout, (char *)header1,
1696 sizeof header1, &gsize);
1697 fclose(in);
1698 break;
1699 #endif
1700 #ifndef NO_PACK_SUPPORT
1701 case FT_PACK:
1702 usize = unpack(STDIN_FILENO, STDOUT_FILENO,
1703 (char *)header1, sizeof header1, &gsize);
1704 break;
1705 #endif
1706 #ifndef NO_XZ_SUPPORT
1707 case FT_XZ:
1708 usize = unxz(STDIN_FILENO, STDOUT_FILENO,
1709 (char *)header1, sizeof header1, &gsize);
1710 break;
1711 #endif
1712 }
1713
1714 #ifndef SMALL
1715 if (vflag && !tflag && usize != -1 && gsize != -1)
1716 print_verbage(NULL, NULL, usize, gsize);
1717 if (vflag && tflag)
1718 print_test("(stdin)", usize != -1);
1719 #endif
1720
1721 }
1722
1723 static void
1724 handle_stdout(void)
1725 {
1726 off_t gsize, usize;
1727 struct stat sb;
1728 time_t systime;
1729 uint32_t mtime;
1730 int ret;
1731
1732 #ifndef SMALL
1733 if (fflag == 0 && isatty(STDOUT_FILENO)) {
1734 maybe_warnx("standard output is a terminal -- ignoring");
1735 return;
1736 }
1737 #endif
1738 /* If stdin is a file use it's mtime, otherwise use current time */
1739 ret = fstat(STDIN_FILENO, &sb);
1740
1741 #ifndef SMALL
1742 if (ret < 0) {
1743 maybe_warn("Can't stat stdin");
1744 return;
1745 }
1746 #endif
1747
1748 if (S_ISREG(sb.st_mode))
1749 mtime = (uint32_t)sb.st_mtime;
1750 else {
1751 systime = time(NULL);
1752 #ifndef SMALL
1753 if (systime == -1) {
1754 maybe_warn("time");
1755 return;
1756 }
1757 #endif
1758 mtime = (uint32_t)systime;
1759 }
1760
1761 usize = gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime);
1762 #ifndef SMALL
1763 if (vflag && !tflag && usize != -1 && gsize != -1)
1764 print_verbage(NULL, NULL, usize, gsize);
1765 #endif
1766 }
1767
1768 /* do what is asked for, for the path name */
1769 static void
1770 handle_pathname(char *path)
1771 {
1772 char *opath = path, *s = NULL;
1773 ssize_t len;
1774 int slen;
1775 struct stat sb;
1776
1777 /* check for stdout/stdin */
1778 if (path[0] == '-' && path[1] == '\0') {
1779 if (dflag)
1780 handle_stdin();
1781 else
1782 handle_stdout();
1783 return;
1784 }
1785
1786 retry:
1787 if (stat(path, &sb) != 0) {
1788 /* lets try <path>.gz if we're decompressing */
1789 if (dflag && s == NULL && errno == ENOENT) {
1790 len = strlen(path);
1791 slen = suffixes[0].ziplen;
1792 s = malloc(len + slen + 1);
1793 if (s == NULL)
1794 maybe_err("malloc");
1795 memcpy(s, path, len);
1796 memcpy(s + len, suffixes[0].zipped, slen + 1);
1797 path = s;
1798 goto retry;
1799 }
1800 maybe_warn("can't stat: %s", opath);
1801 goto out;
1802 }
1803
1804 if (S_ISDIR(sb.st_mode)) {
1805 #ifndef SMALL
1806 if (rflag)
1807 handle_dir(path);
1808 else
1809 #endif
1810 maybe_warnx("%s is a directory", path);
1811 goto out;
1812 }
1813
1814 if (S_ISREG(sb.st_mode))
1815 handle_file(path, &sb);
1816 else
1817 maybe_warnx("%s is not a regular file", path);
1818
1819 out:
1820 if (s)
1821 free(s);
1822 }
1823
1824 /* compress/decompress a file */
1825 static void
1826 handle_file(char *file, struct stat *sbp)
1827 {
1828 off_t usize, gsize;
1829 char outfile[PATH_MAX];
1830
1831 infile = file;
1832 if (dflag) {
1833 usize = file_uncompress(file, outfile, sizeof(outfile));
1834 #ifndef SMALL
1835 if (vflag && tflag)
1836 print_test(file, usize != -1);
1837 #endif
1838 if (usize == -1)
1839 return;
1840 gsize = sbp->st_size;
1841 } else {
1842 gsize = file_compress(file, outfile, sizeof(outfile));
1843 if (gsize == -1)
1844 return;
1845 usize = sbp->st_size;
1846 }
1847
1848
1849 #ifndef SMALL
1850 if (vflag && !tflag)
1851 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
1852 #endif
1853 }
1854
1855 #ifndef SMALL
1856 /* this is used with -r to recursively descend directories */
1857 static void
1858 handle_dir(char *dir)
1859 {
1860 char *path_argv[2];
1861 FTS *fts;
1862 FTSENT *entry;
1863
1864 path_argv[0] = dir;
1865 path_argv[1] = 0;
1866 fts = fts_open(path_argv, FTS_PHYSICAL, NULL);
1867 if (fts == NULL) {
1868 warn("couldn't fts_open %s", dir);
1869 return;
1870 }
1871
1872 while ((entry = fts_read(fts))) {
1873 switch(entry->fts_info) {
1874 case FTS_D:
1875 case FTS_DP:
1876 continue;
1877
1878 case FTS_DNR:
1879 case FTS_ERR:
1880 case FTS_NS:
1881 maybe_warn("%s", entry->fts_path);
1882 continue;
1883 case FTS_F:
1884 handle_file(entry->fts_name, entry->fts_statp);
1885 }
1886 }
1887 (void)fts_close(fts);
1888 }
1889 #endif
1890
1891 /* print a ratio - size reduction as a fraction of uncompressed size */
1892 static void
1893 print_ratio(off_t in, off_t out, FILE *where)
1894 {
1895 int percent10; /* 10 * percent */
1896 off_t diff;
1897 char buff[8];
1898 int len;
1899
1900 diff = in - out/2;
1901 if (diff <= 0)
1902 /*
1903 * Output is more than double size of input! print -99.9%
1904 * Quite possibly we've failed to get the original size.
1905 */
1906 percent10 = -999;
1907 else {
1908 /*
1909 * We only need 12 bits of result from the final division,
1910 * so reduce the values until a 32bit division will suffice.
1911 */
1912 while (in > 0x100000) {
1913 diff >>= 1;
1914 in >>= 1;
1915 }
1916 if (in != 0)
1917 percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
1918 else
1919 percent10 = 0;
1920 }
1921
1922 len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
1923 /* Move the '.' to before the last digit */
1924 buff[len - 1] = buff[len - 2];
1925 buff[len - 2] = '.';
1926 fprintf(where, "%5s%%", buff);
1927 }
1928
1929 #ifndef SMALL
1930 /* print compression statistics, and the new name (if there is one!) */
1931 static void
1932 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
1933 {
1934 if (file)
1935 fprintf(stderr, "%s:%s ", file,
1936 strlen(file) < 7 ? "\t\t" : "\t");
1937 print_ratio(usize, gsize, stderr);
1938 if (nfile)
1939 fprintf(stderr, " -- replaced with %s", nfile);
1940 fprintf(stderr, "\n");
1941 fflush(stderr);
1942 }
1943
1944 /* print test results */
1945 static void
1946 print_test(const char *file, int ok)
1947 {
1948
1949 if (exit_value == 0 && ok == 0)
1950 exit_value = 1;
1951 fprintf(stderr, "%s:%s %s\n", file,
1952 strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
1953 fflush(stderr);
1954 }
1955 #endif
1956
1957 /* print a file's info ala --list */
1958 /* eg:
1959 compressed uncompressed ratio uncompressed_name
1960 354841 1679360 78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
1961 */
1962 static void
1963 print_list(int fd, off_t out, const char *outfile, time_t ts)
1964 {
1965 static int first = 1;
1966 #ifndef SMALL
1967 static off_t in_tot, out_tot;
1968 uint32_t crc = 0;
1969 #endif
1970 off_t in = 0, rv;
1971
1972 if (first) {
1973 #ifndef SMALL
1974 if (vflag)
1975 printf("method crc date time ");
1976 #endif
1977 if (qflag == 0)
1978 printf(" compressed uncompressed "
1979 "ratio uncompressed_name\n");
1980 }
1981 first = 0;
1982
1983 /* print totals? */
1984 #ifndef SMALL
1985 if (fd == -1) {
1986 in = in_tot;
1987 out = out_tot;
1988 } else
1989 #endif
1990 {
1991 /* read the last 4 bytes - this is the uncompressed size */
1992 rv = lseek(fd, (off_t)(-8), SEEK_END);
1993 if (rv != -1) {
1994 unsigned char buf[8];
1995 uint32_t usize;
1996
1997 rv = read(fd, (char *)buf, sizeof(buf));
1998 if (rv == -1)
1999 maybe_warn("read of uncompressed size");
2000 else if (rv != sizeof(buf))
2001 maybe_warnx("read of uncompressed size");
2002
2003 else {
2004 usize = buf[4] | buf[5] << 8 |
2005 buf[6] << 16 | buf[7] << 24;
2006 in = (off_t)usize;
2007 #ifndef SMALL
2008 crc = buf[0] | buf[1] << 8 |
2009 buf[2] << 16 | buf[3] << 24;
2010 #endif
2011 }
2012 }
2013 }
2014
2015 #ifndef SMALL
2016 if (vflag && fd == -1)
2017 printf(" ");
2018 else if (vflag) {
2019 char *date = ctime(&ts);
2020
2021 /* skip the day, 1/100th second, and year */
2022 date += 4;
2023 date[12] = 0;
2024 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
2025 }
2026 in_tot += in;
2027 out_tot += out;
2028 #endif
2029 printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
2030 print_ratio(in, out, stdout);
2031 printf(" %s\n", outfile);
2032 }
2033
2034 /* display the usage of NetBSD gzip */
2035 static void
2036 usage(void)
2037 {
2038
2039 fprintf(stderr, "%s\n", gzip_version);
2040 fprintf(stderr,
2041 "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n"
2042 #ifndef SMALL
2043 " -1 --fast fastest (worst) compression\n"
2044 " -2 .. -8 set compression level\n"
2045 " -9 --best best (slowest) compression\n"
2046 " -c --stdout write to stdout, keep original files\n"
2047 " --to-stdout\n"
2048 " -d --decompress uncompress files\n"
2049 " --uncompress\n"
2050 " -f --force force overwriting & compress links\n"
2051 " -h --help display this help\n"
2052 " -k --keep don't delete input files during operation\n"
2053 " -l --list list compressed file contents\n"
2054 " -N --name save or restore original file name and time stamp\n"
2055 " -n --no-name don't save original file name or time stamp\n"
2056 " -q --quiet output no warnings\n"
2057 " -r --recursive recursively compress files in directories\n"
2058 " -S .suf use suffix .suf instead of .gz\n"
2059 " --suffix .suf\n"
2060 " -t --test test compressed file\n"
2061 " -V --version display program version\n"
2062 " -v --verbose print extra statistics\n",
2063 #else
2064 ,
2065 #endif
2066 getprogname());
2067 exit(0);
2068 }
2069
2070 /* display the version of NetBSD gzip */
2071 static void
2072 display_version(void)
2073 {
2074
2075 fprintf(stderr, "%s\n", gzip_version);
2076 exit(0);
2077 }
2078
2079 #ifndef NO_BZIP2_SUPPORT
2080 #include "unbzip2.c"
2081 #endif
2082 #ifndef NO_COMPRESS_SUPPORT
2083 #include "zuncompress.c"
2084 #endif
2085 #ifndef NO_PACK_SUPPORT
2086 #include "unpack.c"
2087 #endif
2088 #ifndef NO_XZ_SUPPORT
2089 #include "unxz.c"
2090 #endif
2091
2092 static ssize_t
2093 read_retry(int fd, void *buf, size_t sz)
2094 {
2095 char *cp = buf;
2096 size_t left = MIN(sz, (size_t) SSIZE_MAX);
2097
2098 while (left > 0) {
2099 ssize_t ret;
2100
2101 ret = read(fd, cp, left);
2102 if (ret == -1) {
2103 return ret;
2104 } else if (ret == 0) {
2105 break; /* EOF */
2106 }
2107 cp += ret;
2108 left -= ret;
2109 }
2110
2111 return sz - left;
2112 }
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