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kernel: Fix buildkernel without INVARIANTS.
[dragonfly.git] / usr.bin / gzip / gzip.c
blob6b28fe80eb671581725a8ea9c09a00545ed0b17e
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 int main(int, char *p[]);
229
230 #ifdef SMALL
231 #define getopt_long(a,b,c,d,e) getopt(a,b,c)
232 #else
233 static const struct option longopts[] = {
234 { "stdout", no_argument, 0, 'c' },
235 { "to-stdout", no_argument, 0, 'c' },
236 { "decompress", no_argument, 0, 'd' },
237 { "uncompress", no_argument, 0, 'd' },
238 { "force", no_argument, 0, 'f' },
239 { "help", no_argument, 0, 'h' },
240 { "keep", no_argument, 0, 'k' },
241 { "list", no_argument, 0, 'l' },
242 { "no-name", no_argument, 0, 'n' },
243 { "name", no_argument, 0, 'N' },
244 { "quiet", no_argument, 0, 'q' },
245 { "recursive", no_argument, 0, 'r' },
246 { "suffix", required_argument, 0, 'S' },
247 { "test", no_argument, 0, 't' },
248 { "verbose", no_argument, 0, 'v' },
249 { "version", no_argument, 0, 'V' },
250 { "fast", no_argument, 0, '1' },
251 { "best", no_argument, 0, '9' },
252 #if 0
253 /*
254 * This is what else GNU gzip implements. --ascii isn't useful
255 * on NetBSD, and I don't care to have a --license.
256 */
257 { "ascii", no_argument, 0, 'a' },
258 { "license", no_argument, 0, 'L' },
259 #endif
260 { NULL, no_argument, 0, 0 },
261 };
262 #endif
263
264 int
265 main(int argc, char **argv)
266 {
267 const char *progname = getprogname();
268 #ifndef SMALL
269 char *gzip;
270 int len;
271 #endif
272 int ch;
273
274 /* XXX set up signals */
275
276 #ifndef SMALL
277 if ((gzip = getenv("GZIP")) != NULL)
278 prepend_gzip(gzip, &argc, &argv);
279 #endif
280
281 /*
282 * XXX
283 * handle being called `gunzip', `zcat' and `gzcat'
284 */
285 if (strcmp(progname, "gunzip") == 0)
286 dflag = 1;
287 else if (strcmp(progname, "zcat") == 0 ||
288 strcmp(progname, "gzcat") == 0)
289 dflag = cflag = 1;
290
291 #ifdef SMALL
292 #define OPT_LIST "123456789cdhltV"
293 #else
294 #define OPT_LIST "123456789cdfhklNnqrS:tVv"
295 #endif
296
297 while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) {
298 switch (ch) {
299 case '1': case '2': case '3':
300 case '4': case '5': case '6':
301 case '7': case '8': case '9':
302 numflag = ch - '0';
303 break;
304 case 'c':
305 cflag = 1;
306 break;
307 case 'd':
308 dflag = 1;
309 break;
310 case 'l':
311 lflag = 1;
312 dflag = 1;
313 break;
314 case 'V':
315 display_version();
316 /* NOTREACHED */
317 #ifndef SMALL
318 case 'f':
319 fflag = 1;
320 break;
321 case 'k':
322 kflag = 1;
323 break;
324 case 'N':
325 nflag = 0;
326 Nflag = 1;
327 break;
328 case 'n':
329 nflag = 1;
330 Nflag = 0;
331 break;
332 case 'q':
333 qflag = 1;
334 break;
335 case 'r':
336 rflag = 1;
337 break;
338 case 'S':
339 len = strlen(optarg);
340 if (len != 0) {
341 if (len >= SUFFIX_MAXLEN)
342 errx(1, "incorrect suffix: '%s'", optarg);
343 suffixes[0].zipped = optarg;
344 suffixes[0].ziplen = len;
345 } else {
346 suffixes[NUM_SUFFIXES - 1].zipped = "";
347 suffixes[NUM_SUFFIXES - 1].ziplen = 0;
348 }
349 break;
350 case 't':
351 cflag = 1;
352 tflag = 1;
353 dflag = 1;
354 break;
355 case 'v':
356 vflag = 1;
357 break;
358 #endif
359 default:
360 usage();
361 /* NOTREACHED */
362 }
363 }
364 argv += optind;
365 argc -= optind;
366
367 if (argc == 0) {
368 if (dflag) /* stdin mode */
369 handle_stdin();
370 else /* stdout mode */
371 handle_stdout();
372 } else {
373 do {
374 handle_pathname(argv[0]);
375 } while (*++argv);
376 }
377 #ifndef SMALL
378 if (qflag == 0 && lflag && argc > 1)
379 print_list(-1, 0, "(totals)", 0);
380 #endif
381 exit(exit_value);
382 }
383
384 /* maybe print a warning */
385 void
386 maybe_warn(const char *fmt, ...)
387 {
388 va_list ap;
389
390 if (qflag == 0) {
391 va_start(ap, fmt);
392 vwarn(fmt, ap);
393 va_end(ap);
394 }
395 if (exit_value == 0)
396 exit_value = 1;
397 }
398
399 /* ... without an errno. */
400 void
401 maybe_warnx(const char *fmt, ...)
402 {
403 va_list ap;
404
405 if (qflag == 0) {
406 va_start(ap, fmt);
407 vwarnx(fmt, ap);
408 va_end(ap);
409 }
410 if (exit_value == 0)
411 exit_value = 1;
412 }
413
414 /* maybe print an error */
415 void
416 maybe_err(const char *fmt, ...)
417 {
418 va_list ap;
419
420 if (qflag == 0) {
421 va_start(ap, fmt);
422 vwarn(fmt, ap);
423 va_end(ap);
424 }
425 exit(2);
426 }
427
428 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT)
429 /* ... without an errno. */
430 void
431 maybe_errx(const char *fmt, ...)
432 {
433 va_list ap;
434
435 if (qflag == 0) {
436 va_start(ap, fmt);
437 vwarnx(fmt, ap);
438 va_end(ap);
439 }
440 exit(2);
441 }
442 #endif
443
444 #ifndef SMALL
445 /* split up $GZIP and prepend it to the argument list */
446 static void
447 prepend_gzip(char *gzip, int *argc, char ***argv)
448 {
449 char *s, **nargv, **ac;
450 int nenvarg = 0, i;
451
452 /* scan how many arguments there are */
453 for (s = gzip;;) {
454 while (*s == ' ' || *s == '\t')
455 s++;
456 if (*s == 0)
457 goto count_done;
458 nenvarg++;
459 while (*s != ' ' && *s != '\t')
460 if (*s++ == 0)
461 goto count_done;
462 }
463 count_done:
464 /* punt early */
465 if (nenvarg == 0)
466 return;
467
468 *argc += nenvarg;
469 ac = *argv;
470
471 nargv = (char **)malloc((*argc + 1) * sizeof(char *));
472 if (nargv == NULL)
473 maybe_err("malloc");
474
475 /* stash this away */
476 *argv = nargv;
477
478 /* copy the program name first */
479 i = 0;
480 nargv[i++] = *(ac++);
481
482 /* take a copy of $GZIP and add it to the array */
483 s = strdup(gzip);
484 if (s == NULL)
485 maybe_err("strdup");
486 for (;;) {
487 /* Skip whitespaces. */
488 while (*s == ' ' || *s == '\t')
489 s++;
490 if (*s == 0)
491 goto copy_done;
492 nargv[i++] = s;
493 /* Find the end of this argument. */
494 while (*s != ' ' && *s != '\t')
495 if (*s++ == 0)
496 /* Argument followed by NUL. */
497 goto copy_done;
498 /* Terminate by overwriting ' ' or '\t' with NUL. */
499 *s++ = 0;
500 }
501 copy_done:
502
503 /* copy the original arguments and a NULL */
504 while (*ac)
505 nargv[i++] = *(ac++);
506 nargv[i] = NULL;
507 }
508 #endif
509
510 /* compress input to output. Return bytes read, -1 on error */
511 static off_t
512 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime)
513 {
514 z_stream z;
515 char *outbufp, *inbufp;
516 off_t in_tot = 0, out_tot = 0;
517 ssize_t in_size;
518 int i, error;
519 uLong crc;
520 #ifdef SMALL
521 static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0,
522 0, 0, 0, 0,
523 0, OS_CODE };
524 #endif
525
526 outbufp = malloc(BUFLEN);
527 inbufp = malloc(BUFLEN);
528 if (outbufp == NULL || inbufp == NULL) {
529 maybe_err("malloc failed");
530 goto out;
531 }
532
533 memset(&z, 0, sizeof z);
534 z.zalloc = Z_NULL;
535 z.zfree = Z_NULL;
536 z.opaque = 0;
537
538 #ifdef SMALL
539 memcpy(outbufp, header, sizeof header);
540 i = sizeof header;
541 #else
542 if (nflag != 0) {
543 mtime = 0;
544 origname = "";
545 }
546
547 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s",
548 GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED,
549 *origname ? ORIG_NAME : 0,
550 mtime & 0xff,
551 (mtime >> 8) & 0xff,
552 (mtime >> 16) & 0xff,
553 (mtime >> 24) & 0xff,
554 numflag == 1 ? 4 : numflag == 9 ? 2 : 0,
555 OS_CODE, origname);
556 if (i >= BUFLEN)
557 /* this need PATH_MAX > BUFLEN ... */
558 maybe_err("snprintf");
559 if (*origname)
560 i++;
561 #endif
562
563 z.next_out = outbufp + i;
564 z.avail_out = BUFLEN - i;
565
566 error = deflateInit2(&z, numflag, Z_DEFLATED,
567 (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY);
568 if (error != Z_OK) {
569 maybe_warnx("deflateInit2 failed");
570 in_tot = -1;
571 goto out;
572 }
573
574 crc = crc32(0L, Z_NULL, 0);
575 for (;;) {
576 if (z.avail_out == 0) {
577 if (write(out, outbufp, BUFLEN) != BUFLEN) {
578 maybe_warn("write");
579 out_tot = -1;
580 goto out;
581 }
582
583 out_tot += BUFLEN;
584 z.next_out = outbufp;
585 z.avail_out = BUFLEN;
586 }
587
588 if (z.avail_in == 0) {
589 in_size = read(in, inbufp, BUFLEN);
590 if (in_size < 0) {
591 maybe_warn("read");
592 in_tot = -1;
593 goto out;
594 }
595 if (in_size == 0)
596 break;
597
598 crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size);
599 in_tot += in_size;
600 z.next_in = inbufp;
601 z.avail_in = in_size;
602 }
603
604 error = deflate(&z, Z_NO_FLUSH);
605 if (error != Z_OK && error != Z_STREAM_END) {
606 maybe_warnx("deflate failed");
607 in_tot = -1;
608 goto out;
609 }
610 }
611
612 /* clean up */
613 for (;;) {
614 size_t len;
615 ssize_t w;
616
617 error = deflate(&z, Z_FINISH);
618 if (error != Z_OK && error != Z_STREAM_END) {
619 maybe_warnx("deflate failed");
620 in_tot = -1;
621 goto out;
622 }
623
624 len = (char *)z.next_out - outbufp;
625
626 w = write(out, outbufp, len);
627 if (w == -1 || (size_t)w != len) {
628 maybe_warn("write");
629 out_tot = -1;
630 goto out;
631 }
632 out_tot += len;
633 z.next_out = outbufp;
634 z.avail_out = BUFLEN;
635
636 if (error == Z_STREAM_END)
637 break;
638 }
639
640 if (deflateEnd(&z) != Z_OK) {
641 maybe_warnx("deflateEnd failed");
642 in_tot = -1;
643 goto out;
644 }
645
646 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c",
647 (int)crc & 0xff,
648 (int)(crc >> 8) & 0xff,
649 (int)(crc >> 16) & 0xff,
650 (int)(crc >> 24) & 0xff,
651 (int)in_tot & 0xff,
652 (int)(in_tot >> 8) & 0xff,
653 (int)(in_tot >> 16) & 0xff,
654 (int)(in_tot >> 24) & 0xff);
655 if (i != 8)
656 maybe_err("snprintf");
657 #if 0
658 if (in_tot > 0xffffffff)
659 maybe_warn("input file size >= 4GB cannot be saved");
660 #endif
661 if (write(out, outbufp, i) != i) {
662 maybe_warn("write");
663 in_tot = -1;
664 } else
665 out_tot += i;
666
667 out:
668 if (inbufp != NULL)
669 free(inbufp);
670 if (outbufp != NULL)
671 free(outbufp);
672 if (gsizep)
673 *gsizep = out_tot;
674 return in_tot;
675 }
676
677 /*
678 * uncompress input to output then close the input. return the
679 * uncompressed size written, and put the compressed sized read
680 * into `*gsizep'.
681 */
682 static off_t
683 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
684 const char *filename)
685 {
686 z_stream z;
687 char *outbufp, *inbufp;
688 off_t out_tot = -1, in_tot = 0;
689 uint32_t out_sub_tot = 0;
690 enum {
691 GZSTATE_MAGIC0,
692 GZSTATE_MAGIC1,
693 GZSTATE_METHOD,
694 GZSTATE_FLAGS,
695 GZSTATE_SKIPPING,
696 GZSTATE_EXTRA,
697 GZSTATE_EXTRA2,
698 GZSTATE_EXTRA3,
699 GZSTATE_ORIGNAME,
700 GZSTATE_COMMENT,
701 GZSTATE_HEAD_CRC1,
702 GZSTATE_HEAD_CRC2,
703 GZSTATE_INIT,
704 GZSTATE_READ,
705 GZSTATE_CRC,
706 GZSTATE_LEN,
707 } state = GZSTATE_MAGIC0;
708 int flags = 0, skip_count = 0;
709 int error = Z_STREAM_ERROR, done_reading = 0;
710 uLong crc = 0;
711 ssize_t wr;
712 int needmore = 0;
713
714 #define ADVANCE() { z.next_in++; z.avail_in--; }
715
716 if ((outbufp = malloc(BUFLEN)) == NULL) {
717 maybe_err("malloc failed");
718 goto out2;
719 }
720 if ((inbufp = malloc(BUFLEN)) == NULL) {
721 maybe_err("malloc failed");
722 goto out1;
723 }
724
725 memset(&z, 0, sizeof z);
726 z.avail_in = prelen;
727 z.next_in = pre;
728 z.avail_out = BUFLEN;
729 z.next_out = outbufp;
730 z.zalloc = NULL;
731 z.zfree = NULL;
732 z.opaque = 0;
733
734 in_tot = prelen;
735 out_tot = 0;
736
737 for (;;) {
738 if ((z.avail_in == 0 || needmore) && done_reading == 0) {
739 ssize_t in_size;
740
741 if (z.avail_in > 0) {
742 memmove(inbufp, z.next_in, z.avail_in);
743 }
744 z.next_in = inbufp;
745 in_size = read(in, z.next_in + z.avail_in,
746 BUFLEN - z.avail_in);
747
748 if (in_size == -1) {
749 maybe_warn("failed to read stdin");
750 goto stop_and_fail;
751 } else if (in_size == 0) {
752 done_reading = 1;
753 }
754
755 z.avail_in += in_size;
756 needmore = 0;
757
758 in_tot += in_size;
759 }
760 if (z.avail_in == 0) {
761 if (done_reading && state != GZSTATE_MAGIC0) {
762 maybe_warnx("%s: unexpected end of file",
763 filename);
764 goto stop_and_fail;
765 }
766 goto stop;
767 }
768 switch (state) {
769 case GZSTATE_MAGIC0:
770 if (*z.next_in != GZIP_MAGIC0) {
771 if (in_tot > 0) {
772 maybe_warnx("%s: trailing garbage "
773 "ignored", filename);
774 goto stop;
775 }
776 maybe_warnx("input not gziped (MAGIC0)");
777 goto stop_and_fail;
778 }
779 ADVANCE();
780 state++;
781 out_sub_tot = 0;
782 crc = crc32(0L, Z_NULL, 0);
783 break;
784
785 case GZSTATE_MAGIC1:
786 if (*z.next_in != GZIP_MAGIC1 &&
787 *z.next_in != GZIP_OMAGIC1) {
788 maybe_warnx("input not gziped (MAGIC1)");
789 goto stop_and_fail;
790 }
791 ADVANCE();
792 state++;
793 break;
794
795 case GZSTATE_METHOD:
796 if (*z.next_in != Z_DEFLATED) {
797 maybe_warnx("unknown compression method");
798 goto stop_and_fail;
799 }
800 ADVANCE();
801 state++;
802 break;
803
804 case GZSTATE_FLAGS:
805 flags = *z.next_in;
806 ADVANCE();
807 skip_count = 6;
808 state++;
809 break;
810
811 case GZSTATE_SKIPPING:
812 if (skip_count > 0) {
813 skip_count--;
814 ADVANCE();
815 } else
816 state++;
817 break;
818
819 case GZSTATE_EXTRA:
820 if ((flags & EXTRA_FIELD) == 0) {
821 state = GZSTATE_ORIGNAME;
822 break;
823 }
824 skip_count = *z.next_in;
825 ADVANCE();
826 state++;
827 break;
828
829 case GZSTATE_EXTRA2:
830 skip_count |= ((*z.next_in) << 8);
831 ADVANCE();
832 state++;
833 break;
834
835 case GZSTATE_EXTRA3:
836 if (skip_count > 0) {
837 skip_count--;
838 ADVANCE();
839 } else
840 state++;
841 break;
842
843 case GZSTATE_ORIGNAME:
844 if ((flags & ORIG_NAME) == 0) {
845 state++;
846 break;
847 }
848 if (*z.next_in == 0)
849 state++;
850 ADVANCE();
851 break;
852
853 case GZSTATE_COMMENT:
854 if ((flags & COMMENT) == 0) {
855 state++;
856 break;
857 }
858 if (*z.next_in == 0)
859 state++;
860 ADVANCE();
861 break;
862
863 case GZSTATE_HEAD_CRC1:
864 if (flags & HEAD_CRC)
865 skip_count = 2;
866 else
867 skip_count = 0;
868 state++;
869 break;
870
871 case GZSTATE_HEAD_CRC2:
872 if (skip_count > 0) {
873 skip_count--;
874 ADVANCE();
875 } else
876 state++;
877 break;
878
879 case GZSTATE_INIT:
880 if (inflateInit2(&z, -MAX_WBITS) != Z_OK) {
881 maybe_warnx("failed to inflateInit");
882 goto stop_and_fail;
883 }
884 state++;
885 break;
886
887 case GZSTATE_READ:
888 error = inflate(&z, Z_FINISH);
889 switch (error) {
890 /* Z_BUF_ERROR goes with Z_FINISH... */
891 case Z_BUF_ERROR:
892 if (z.avail_out > 0 && !done_reading)
893 continue;
894 case Z_STREAM_END:
895 case Z_OK:
896 break;
897
898 case Z_NEED_DICT:
899 maybe_warnx("Z_NEED_DICT error");
900 goto stop_and_fail;
901 case Z_DATA_ERROR:
902 maybe_warnx("data stream error");
903 goto stop_and_fail;
904 case Z_STREAM_ERROR:
905 maybe_warnx("internal stream error");
906 goto stop_and_fail;
907 case Z_MEM_ERROR:
908 maybe_warnx("memory allocation error");
909 goto stop_and_fail;
910
911 default:
912 maybe_warn("unknown error from inflate(): %d",
913 error);
914 }
915 wr = BUFLEN - z.avail_out;
916
917 if (wr != 0) {
918 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr);
919 if (
920 #ifndef SMALL
921 /* don't write anything with -t */
922 tflag == 0 &&
923 #endif
924 write(out, outbufp, wr) != wr) {
925 maybe_warn("error writing to output");
926 goto stop_and_fail;
927 }
928
929 out_tot += wr;
930 out_sub_tot += wr;
931 }
932
933 if (error == Z_STREAM_END) {
934 inflateEnd(&z);
935 state++;
936 }
937
938 z.next_out = outbufp;
939 z.avail_out = BUFLEN;
940
941 break;
942 case GZSTATE_CRC:
943 {
944 uLong origcrc;
945
946 if (z.avail_in < 4) {
947 if (!done_reading) {
948 needmore = 1;
949 continue;
950 }
951 maybe_warnx("truncated input");
952 goto stop_and_fail;
953 }
954 origcrc = ((unsigned)z.next_in[0] & 0xff) |
955 ((unsigned)z.next_in[1] & 0xff) << 8 |
956 ((unsigned)z.next_in[2] & 0xff) << 16 |
957 ((unsigned)z.next_in[3] & 0xff) << 24;
958 if (origcrc != crc) {
959 maybe_warnx("invalid compressed"
960 " data--crc error");
961 goto stop_and_fail;
962 }
963 }
964
965 z.avail_in -= 4;
966 z.next_in += 4;
967
968 if (!z.avail_in && done_reading) {
969 goto stop;
970 }
971 state++;
972 break;
973 case GZSTATE_LEN:
974 {
975 uLong origlen;
976
977 if (z.avail_in < 4) {
978 if (!done_reading) {
979 needmore = 1;
980 continue;
981 }
982 maybe_warnx("truncated input");
983 goto stop_and_fail;
984 }
985 origlen = ((unsigned)z.next_in[0] & 0xff) |
986 ((unsigned)z.next_in[1] & 0xff) << 8 |
987 ((unsigned)z.next_in[2] & 0xff) << 16 |
988 ((unsigned)z.next_in[3] & 0xff) << 24;
989
990 if (origlen != out_sub_tot) {
991 maybe_warnx("invalid compressed"
992 " data--length error");
993 goto stop_and_fail;
994 }
995 }
996
997 z.avail_in -= 4;
998 z.next_in += 4;
999
1000 if (error < 0) {
1001 maybe_warnx("decompression error");
1002 goto stop_and_fail;
1003 }
1004 state = GZSTATE_MAGIC0;
1005 break;
1006 }
1007 continue;
1008 stop_and_fail:
1009 out_tot = -1;
1010 stop:
1011 break;
1012 }
1013 if (state > GZSTATE_INIT)
1014 inflateEnd(&z);
1015
1016 free(inbufp);
1017 out1:
1018 free(outbufp);
1019 out2:
1020 if (gsizep)
1021 *gsizep = in_tot;
1022 return (out_tot);
1023 }
1024
1025 #ifndef SMALL
1026 /*
1027 * set the owner, mode, flags & utimes using the given file descriptor.
1028 * file is only used in possible warning messages.
1029 */
1030 static void
1031 copymodes(int fd, const struct stat *sbp, const char *file)
1032 {
1033 struct timeval times[2];
1034 struct stat sb;
1035
1036 /*
1037 * If we have no info on the input, give this file some
1038 * default values and return..
1039 */
1040 if (sbp == NULL) {
1041 mode_t mask = umask(022);
1042
1043 (void)fchmod(fd, DEFFILEMODE & ~mask);
1044 (void)umask(mask);
1045 return;
1046 }
1047 sb = *sbp;
1048
1049 /* if the chown fails, remove set-id bits as-per compress(1) */
1050 if (fchown(fd, sb.st_uid, sb.st_gid) < 0) {
1051 if (errno != EPERM)
1052 maybe_warn("couldn't fchown: %s", file);
1053 sb.st_mode &= ~(S_ISUID|S_ISGID);
1054 }
1055
1056 /* we only allow set-id and the 9 normal permission bits */
1057 sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
1058 if (fchmod(fd, sb.st_mode) < 0)
1059 maybe_warn("couldn't fchmod: %s", file);
1060
1061 /* only try flags if they exist already */
1062 if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0)
1063 maybe_warn("couldn't fchflags: %s", file);
1064
1065 TIMESPEC_TO_TIMEVAL(&times[0], &sb.st_atimespec);
1066 TIMESPEC_TO_TIMEVAL(&times[1], &sb.st_mtimespec);
1067 if (futimes(fd, times) < 0)
1068 maybe_warn("couldn't utimes: %s", file);
1069 }
1070 #endif
1071
1072 /* what sort of file is this? */
1073 static enum filetype
1074 file_gettype(u_char *buf)
1075 {
1076
1077 if (buf[0] == GZIP_MAGIC0 &&
1078 (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
1079 return FT_GZIP;
1080 else
1081 #ifndef NO_BZIP2_SUPPORT
1082 if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
1083 buf[3] >= '0' && buf[3] <= '9')
1084 return FT_BZIP2;
1085 else
1086 #endif
1087 #ifndef NO_COMPRESS_SUPPORT
1088 if (memcmp(buf, Z_MAGIC, 2) == 0)
1089 return FT_Z;
1090 else
1091 #endif
1092 #ifndef NO_PACK_SUPPORT
1093 if (memcmp(buf, PACK_MAGIC, 2) == 0)
1094 return FT_PACK;
1095 else
1096 #endif
1097 return FT_UNKNOWN;
1098 }
1099
1100 #ifndef SMALL
1101 /* check the outfile is OK. */
1102 static int
1103 check_outfile(const char *outfile)
1104 {
1105 struct stat sb;
1106 int ok = 1;
1107
1108 if (lflag == 0 && stat(outfile, &sb) == 0) {
1109 if (fflag)
1110 unlink(outfile);
1111 else if (isatty(STDIN_FILENO)) {
1112 char ans[10] = { 'n', '\0' }; /* default */
1113
1114 fprintf(stderr, "%s already exists -- do you wish to "
1115 "overwrite (y or n)? " , outfile);
1116 (void)fgets(ans, sizeof(ans) - 1, stdin);
1117 if (ans[0] != 'y' && ans[0] != 'Y') {
1118 fprintf(stderr, "\tnot overwriting\n");
1119 ok = 0;
1120 } else
1121 unlink(outfile);
1122 } else {
1123 maybe_warnx("%s already exists -- skipping", outfile);
1124 ok = 0;
1125 }
1126 }
1127 return ok;
1128 }
1129
1130 static void
1131 unlink_input(const char *file, const struct stat *sb)
1132 {
1133 struct stat nsb;
1134
1135 if (kflag)
1136 return;
1137 if (stat(file, &nsb) != 0)
1138 /* Must be gone alrady */
1139 return;
1140 if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
1141 /* Definitely a different file */
1142 return;
1143 unlink(file);
1144 }
1145 #endif
1146
1147 static const suffixes_t *
1148 check_suffix(char *file, int xlate)
1149 {
1150 const suffixes_t *s;
1151 int len = strlen(file);
1152 char *sp;
1153
1154 for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
1155 /* if it doesn't fit in "a.suf", don't bother */
1156 if (s->ziplen >= len)
1157 continue;
1158 sp = file + len - s->ziplen;
1159 if (strcmp(s->zipped, sp) != 0)
1160 continue;
1161 if (xlate)
1162 strcpy(sp, s->normal);
1163 return s;
1164 }
1165 return NULL;
1166 }
1167
1168 /*
1169 * compress the given file: create a corresponding .gz file and remove the
1170 * original.
1171 */
1172 static off_t
1173 file_compress(char *file, char *outfile, size_t outsize)
1174 {
1175 int in;
1176 int out;
1177 off_t size, insize;
1178 #ifndef SMALL
1179 struct stat isb, osb;
1180 const suffixes_t *suff;
1181 #endif
1182
1183 in = open(file, O_RDONLY);
1184 if (in == -1) {
1185 maybe_warn("can't open %s", file);
1186 return -1;
1187 }
1188
1189 if (cflag == 0) {
1190 #ifndef SMALL
1191 if (fstat(in, &isb) == 0) {
1192 if (isb.st_nlink > 1 && fflag == 0) {
1193 maybe_warnx("%s has %d other link%s -- "
1194 "skipping", file, isb.st_nlink - 1,
1195 isb.st_nlink == 1 ? "" : "s");
1196 close(in);
1197 return -1;
1198 }
1199 }
1200
1201 if (fflag == 0 && (suff = check_suffix(file, 0))
1202 && suff->zipped[0] != 0) {
1203 maybe_warnx("%s already has %s suffix -- unchanged",
1204 file, suff->zipped);
1205 close(in);
1206 return -1;
1207 }
1208 #endif
1209
1210 /* Add (usually) .gz to filename */
1211 if ((size_t)snprintf(outfile, outsize, "%s%s",
1212 file, suffixes[0].zipped) >= outsize) {
1213 errx(1, "file path too long: %s", file);
1214 }
1215 #ifndef SMALL
1216 if (check_outfile(outfile) == 0) {
1217 close(in);
1218 return -1;
1219 }
1220 #endif
1221 }
1222
1223 if (cflag == 0) {
1224 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
1225 if (out == -1) {
1226 maybe_warn("could not create output: %s", outfile);
1227 fclose(stdin);
1228 return -1;
1229 }
1230 } else
1231 out = STDOUT_FILENO;
1232
1233 insize = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
1234
1235 (void)close(in);
1236
1237 /*
1238 * If there was an error, insize will be -1.
1239 * If we compressed to stdout, just return the size.
1240 * Otherwise stat the file and check it is the correct size.
1241 * We only blow away the file if we can stat the output and it
1242 * has the expected size.
1243 */
1244 if (cflag != 0)
1245 return insize == -1 ? -1 : size;
1246
1247 #ifndef SMALL
1248 if (fstat(out, &osb) != 0) {
1249 maybe_warn("couldn't stat: %s", outfile);
1250 goto bad_outfile;
1251 }
1252
1253 if (osb.st_size != size) {
1254 maybe_warnx("output file: %s wrong size (%" PRIdOFF
1255 " != %" PRIdOFF "), deleting",
1256 outfile, osb.st_size, size);
1257 goto bad_outfile;
1258 }
1259
1260 copymodes(out, &isb, outfile);
1261 #endif
1262 if (close(out) == -1)
1263 maybe_warn("couldn't close output");
1264
1265 /* output is good, ok to delete input */
1266 unlink_input(file, &isb);
1267 return size;
1268
1269 #ifndef SMALL
1270 bad_outfile:
1271 if (close(out) == -1)
1272 maybe_warn("couldn't close output");
1273
1274 maybe_warnx("leaving original %s", file);
1275 unlink(outfile);
1276 return size;
1277 #endif
1278 }
1279
1280 /* uncompress the given file and remove the original */
1281 static off_t
1282 file_uncompress(char *file, char *outfile, size_t outsize)
1283 {
1284 struct stat isb, osb;
1285 off_t size;
1286 ssize_t rbytes;
1287 unsigned char header1[4];
1288 enum filetype method;
1289 int fd, ofd, zfd = -1;
1290 #ifndef SMALL
1291 ssize_t rv;
1292 time_t timestamp = 0;
1293 unsigned char name[PATH_MAX + 1];
1294 #endif
1295
1296 /* gather the old name info */
1297
1298 fd = open(file, O_RDONLY);
1299 if (fd < 0) {
1300 maybe_warn("can't open %s", file);
1301 goto lose;
1302 }
1303
1304 if ((size_t)snprintf(outfile, outsize, "%s", file) >= outsize)
1305 errx(1, "file path too long: %s", file);
1306 if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
1307 maybe_warnx("%s: unknown suffix -- ignored", file);
1308 goto lose;
1309 }
1310
1311 rbytes = read(fd, header1, sizeof header1);
1312 if (rbytes != sizeof header1) {
1313 /* we don't want to fail here. */
1314 #ifndef SMALL
1315 if (fflag)
1316 goto lose;
1317 #endif
1318 if (rbytes == -1)
1319 maybe_warn("can't read %s", file);
1320 else
1321 goto unexpected_EOF;
1322 goto lose;
1323 }
1324
1325 method = file_gettype(header1);
1326
1327 #ifndef SMALL
1328 if (fflag == 0 && method == FT_UNKNOWN) {
1329 maybe_warnx("%s: not in gzip format", file);
1330 goto lose;
1331 }
1332
1333 #endif
1334
1335 #ifndef SMALL
1336 if (method == FT_GZIP && Nflag) {
1337 unsigned char ts[4]; /* timestamp */
1338
1339 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP);
1340 if (rv >= 0 && rv < (ssize_t)(sizeof ts))
1341 goto unexpected_EOF;
1342 if (rv == -1) {
1343 if (!fflag)
1344 maybe_warn("can't read %s", file);
1345 goto lose;
1346 }
1347 timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0];
1348
1349 if (header1[3] & ORIG_NAME) {
1350 rbytes = pread(fd, name, sizeof name, GZIP_ORIGNAME);
1351 if (rbytes < 0) {
1352 maybe_warn("can't read %s", file);
1353 goto lose;
1354 }
1355 if (name[0] != 0) {
1356 /* preserve original directory name */
1357 char *dp = strrchr(file, '/');
1358 if (dp == NULL)
1359 dp = file;
1360 else
1361 dp++;
1362 snprintf(outfile, outsize, "%.*s%.*s",
1363 (int) (dp - file),
1364 file, (int) rbytes, name);
1365 }
1366 }
1367 }
1368 #endif
1369 lseek(fd, 0, SEEK_SET);
1370
1371 if (cflag == 0 || lflag) {
1372 if (fstat(fd, &isb) != 0)
1373 goto lose;
1374 #ifndef SMALL
1375 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
1376 maybe_warnx("%s has %d other links -- skipping",
1377 file, isb.st_nlink - 1);
1378 goto lose;
1379 }
1380 if (nflag == 0 && timestamp)
1381 isb.st_mtime = timestamp;
1382 if (check_outfile(outfile) == 0)
1383 goto lose;
1384 #endif
1385 }
1386
1387 if (cflag == 0 && lflag == 0) {
1388 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
1389 if (zfd == STDOUT_FILENO) {
1390 /* We won't close STDOUT_FILENO later... */
1391 zfd = dup(zfd);
1392 close(STDOUT_FILENO);
1393 }
1394 if (zfd == -1) {
1395 maybe_warn("can't open %s", outfile);
1396 goto lose;
1397 }
1398 } else
1399 zfd = STDOUT_FILENO;
1400
1401 #ifndef NO_BZIP2_SUPPORT
1402 if (method == FT_BZIP2) {
1403
1404 /* XXX */
1405 if (lflag) {
1406 maybe_warnx("no -l with bzip2 files");
1407 goto lose;
1408 }
1409
1410 size = unbzip2(fd, zfd, NULL, 0, NULL);
1411 } else
1412 #endif
1413
1414 #ifndef NO_COMPRESS_SUPPORT
1415 if (method == FT_Z) {
1416 FILE *in, *out;
1417
1418 /* XXX */
1419 if (lflag) {
1420 maybe_warnx("no -l with Lempel-Ziv files");
1421 goto lose;
1422 }
1423
1424 if ((in = zdopen(fd)) == NULL) {
1425 maybe_warn("zdopen for read: %s", file);
1426 goto lose;
1427 }
1428
1429 out = fdopen(dup(zfd), "w");
1430 if (out == NULL) {
1431 maybe_warn("fdopen for write: %s", outfile);
1432 fclose(in);
1433 goto lose;
1434 }
1435
1436 size = zuncompress(in, out, NULL, 0, NULL);
1437 /* need to fclose() if ferror() is true... */
1438 if (ferror(in) | fclose(in)) {
1439 maybe_warn("failed infile fclose");
1440 unlink(outfile);
1441 (void)fclose(out);
1442 }
1443 if (fclose(out) != 0) {
1444 maybe_warn("failed outfile fclose");
1445 unlink(outfile);
1446 goto lose;
1447 }
1448 } else
1449 #endif
1450
1451 #ifndef NO_PACK_SUPPORT
1452 if (method == FT_PACK) {
1453 if (lflag) {
1454 maybe_warnx("no -l with packed files");
1455 goto lose;
1456 }
1457
1458 size = unpack(fd, zfd, NULL, 0, NULL);
1459 } else
1460 #endif
1461
1462 #ifndef SMALL
1463 if (method == FT_UNKNOWN) {
1464 if (lflag) {
1465 maybe_warnx("no -l for unknown filetypes");
1466 goto lose;
1467 }
1468 size = cat_fd(NULL, 0, NULL, fd);
1469 } else
1470 #endif
1471 {
1472 if (lflag) {
1473 print_list(fd, isb.st_size, outfile, isb.st_mtime);
1474 close(fd);
1475 return -1; /* XXX */
1476 }
1477
1478 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
1479 }
1480
1481 if (close(fd) != 0)
1482 maybe_warn("couldn't close input");
1483 if (zfd != STDOUT_FILENO && close(zfd) != 0)
1484 maybe_warn("couldn't close output");
1485
1486 if (size == -1) {
1487 if (cflag == 0)
1488 unlink(outfile);
1489 maybe_warnx("%s: uncompress failed", file);
1490 return -1;
1491 }
1492
1493 /* if testing, or we uncompressed to stdout, this is all we need */
1494 #ifndef SMALL
1495 if (tflag)
1496 return size;
1497 #endif
1498 /* if we are uncompressing to stdin, don't remove the file. */
1499 if (cflag)
1500 return size;
1501
1502 /*
1503 * if we create a file...
1504 */
1505 /*
1506 * if we can't stat the file don't remove the file.
1507 */
1508
1509 ofd = open(outfile, O_RDWR, 0);
1510 if (ofd == -1) {
1511 maybe_warn("couldn't open (leaving original): %s",
1512 outfile);
1513 return -1;
1514 }
1515 if (fstat(ofd, &osb) != 0) {
1516 maybe_warn("couldn't stat (leaving original): %s",
1517 outfile);
1518 close(ofd);
1519 return -1;
1520 }
1521 if (osb.st_size != size) {
1522 maybe_warnx("stat gave different size: %" PRIdOFF
1523 " != %" PRIdOFF " (leaving original)",
1524 size, osb.st_size);
1525 close(ofd);
1526 unlink(outfile);
1527 return -1;
1528 }
1529 unlink_input(file, &isb);
1530 #ifndef SMALL
1531 copymodes(ofd, &isb, outfile);
1532 #endif
1533 close(ofd);
1534 return size;
1535
1536 unexpected_EOF:
1537 maybe_warnx("%s: unexpected end of file", file);
1538 lose:
1539 if (fd != -1)
1540 close(fd);
1541 if (zfd != -1 && zfd != STDOUT_FILENO)
1542 close(fd);
1543 return -1;
1544 }
1545
1546 #ifndef SMALL
1547 static off_t
1548 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd)
1549 {
1550 char buf[BUFLEN];
1551 off_t in_tot;
1552 ssize_t w;
1553
1554 in_tot = count;
1555 w = write(STDOUT_FILENO, prepend, count);
1556 if (w == -1 || (size_t)w != count) {
1557 maybe_warn("write to stdout");
1558 return -1;
1559 }
1560 for (;;) {
1561 ssize_t rv;
1562
1563 rv = read(fd, buf, sizeof buf);
1564 if (rv == 0)
1565 break;
1566 if (rv < 0) {
1567 maybe_warn("read from fd %d", fd);
1568 break;
1569 }
1570
1571 if (write(STDOUT_FILENO, buf, rv) != rv) {
1572 maybe_warn("write to stdout");
1573 break;
1574 }
1575 in_tot += rv;
1576 }
1577
1578 if (gsizep)
1579 *gsizep = in_tot;
1580 return (in_tot);
1581 }
1582 #endif
1583
1584 static void
1585 handle_stdin(void)
1586 {
1587 unsigned char header1[4];
1588 off_t usize, gsize;
1589 enum filetype method;
1590 ssize_t bytes_read;
1591 #ifndef NO_COMPRESS_SUPPORT
1592 FILE *in;
1593 #endif
1594
1595 #ifndef SMALL
1596 if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
1597 maybe_warnx("standard input is a terminal -- ignoring");
1598 return;
1599 }
1600 #endif
1601
1602 if (lflag) {
1603 struct stat isb;
1604
1605 /* XXX could read the whole file, etc. */
1606 if (fstat(STDIN_FILENO, &isb) < 0) {
1607 maybe_warn("fstat");
1608 return;
1609 }
1610 print_list(STDIN_FILENO, isb.st_size, "stdout", isb.st_mtime);
1611 return;
1612 }
1613
1614 bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1);
1615 if (bytes_read == -1) {
1616 maybe_warn("can't read stdin");
1617 return;
1618 } else if (bytes_read != sizeof(header1)) {
1619 maybe_warnx("(stdin): unexpected end of file");
1620 return;
1621 }
1622
1623 method = file_gettype(header1);
1624 switch (method) {
1625 default:
1626 #ifndef SMALL
1627 if (fflag == 0) {
1628 maybe_warnx("unknown compression format");
1629 return;
1630 }
1631 usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO);
1632 break;
1633 #endif
1634 case FT_GZIP:
1635 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
1636 header1, sizeof header1, &gsize, "(stdin)");
1637 break;
1638 #ifndef NO_BZIP2_SUPPORT
1639 case FT_BZIP2:
1640 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
1641 header1, sizeof header1, &gsize);
1642 break;
1643 #endif
1644 #ifndef NO_COMPRESS_SUPPORT
1645 case FT_Z:
1646 if ((in = zdopen(STDIN_FILENO)) == NULL) {
1647 maybe_warnx("zopen of stdin");
1648 return;
1649 }
1650
1651 usize = zuncompress(in, stdout, header1, sizeof header1, &gsize);
1652 fclose(in);
1653 break;
1654 #endif
1655 #ifndef NO_PACK_SUPPORT
1656 case FT_PACK:
1657 usize = unpack(STDIN_FILENO, STDOUT_FILENO,
1658 (char *)header1, sizeof header1, &gsize);
1659 break;
1660 #endif
1661 }
1662
1663 #ifndef SMALL
1664 if (vflag && !tflag && usize != -1 && gsize != -1)
1665 print_verbage(NULL, NULL, usize, gsize);
1666 if (vflag && tflag)
1667 print_test("(stdin)", usize != -1);
1668 #endif
1669
1670 }
1671
1672 static void
1673 handle_stdout(void)
1674 {
1675 off_t gsize, usize;
1676 struct stat sb;
1677 time_t systime;
1678 uint32_t mtime;
1679 int ret;
1680
1681 #ifndef SMALL
1682 if (fflag == 0 && isatty(STDOUT_FILENO)) {
1683 maybe_warnx("standard output is a terminal -- ignoring");
1684 return;
1685 }
1686 #endif
1687 /* If stdin is a file use it's mtime, otherwise use current time */
1688 ret = fstat(STDIN_FILENO, &sb);
1689
1690 #ifndef SMALL
1691 if (ret < 0) {
1692 maybe_warn("Can't stat stdin");
1693 return;
1694 }
1695 #endif
1696
1697 if (S_ISREG(sb.st_mode))
1698 mtime = (uint32_t)sb.st_mtime;
1699 else {
1700 systime = time(NULL);
1701 #ifndef SMALL
1702 if (systime == -1) {
1703 maybe_warn("time");
1704 return;
1705 }
1706 #endif
1707 mtime = (uint32_t)systime;
1708 }
1709
1710 usize = gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime);
1711 #ifndef SMALL
1712 if (vflag && !tflag && usize != -1 && gsize != -1)
1713 print_verbage(NULL, NULL, usize, gsize);
1714 #endif
1715 }
1716
1717 /* do what is asked for, for the path name */
1718 static void
1719 handle_pathname(char *path)
1720 {
1721 char *opath = path, *s = NULL;
1722 ssize_t len;
1723 int slen;
1724 struct stat sb;
1725
1726 /* check for stdout/stdin */
1727 if (path[0] == '-' && path[1] == '\0') {
1728 if (dflag)
1729 handle_stdin();
1730 else
1731 handle_stdout();
1732 return;
1733 }
1734
1735 retry:
1736 if (stat(path, &sb) != 0) {
1737 /* lets try <path>.gz if we're decompressing */
1738 if (dflag && s == NULL && errno == ENOENT) {
1739 len = strlen(path);
1740 slen = suffixes[0].ziplen;
1741 s = malloc(len + slen + 1);
1742 if (s == NULL)
1743 maybe_err("malloc");
1744 memcpy(s, path, len);
1745 memcpy(s + len, suffixes[0].zipped, slen + 1);
1746 path = s;
1747 goto retry;
1748 }
1749 maybe_warn("can't stat: %s", opath);
1750 goto out;
1751 }
1752
1753 if (S_ISDIR(sb.st_mode)) {
1754 #ifndef SMALL
1755 if (rflag)
1756 handle_dir(path);
1757 else
1758 #endif
1759 maybe_warnx("%s is a directory", path);
1760 goto out;
1761 }
1762
1763 if (S_ISREG(sb.st_mode))
1764 handle_file(path, &sb);
1765 else
1766 maybe_warnx("%s is not a regular file", path);
1767
1768 out:
1769 if (s)
1770 free(s);
1771 }
1772
1773 /* compress/decompress a file */
1774 static void
1775 handle_file(char *file, struct stat *sbp)
1776 {
1777 off_t usize, gsize;
1778 char outfile[PATH_MAX];
1779
1780 infile = file;
1781 if (dflag) {
1782 usize = file_uncompress(file, outfile, sizeof(outfile));
1783 #ifndef SMALL
1784 if (vflag && tflag)
1785 print_test(file, usize != -1);
1786 #endif
1787 if (usize == -1)
1788 return;
1789 gsize = sbp->st_size;
1790 } else {
1791 gsize = file_compress(file, outfile, sizeof(outfile));
1792 if (gsize == -1)
1793 return;
1794 usize = sbp->st_size;
1795 }
1796
1797
1798 #ifndef SMALL
1799 if (vflag && !tflag)
1800 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
1801 #endif
1802 }
1803
1804 #ifndef SMALL
1805 /* this is used with -r to recursively descend directories */
1806 static void
1807 handle_dir(char *dir)
1808 {
1809 char *path_argv[2];
1810 FTS *fts;
1811 FTSENT *entry;
1812
1813 path_argv[0] = dir;
1814 path_argv[1] = NULL;
1815 fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
1816 if (fts == NULL) {
1817 warn("couldn't fts_open %s", dir);
1818 return;
1819 }
1820
1821 while ((entry = fts_read(fts))) {
1822 switch(entry->fts_info) {
1823 case FTS_D:
1824 case FTS_DP:
1825 continue;
1826
1827 case FTS_DNR:
1828 case FTS_ERR:
1829 case FTS_NS:
1830 maybe_warn("%s", entry->fts_path);
1831 continue;
1832 case FTS_F:
1833 handle_file(entry->fts_path, entry->fts_statp);
1834 }
1835 }
1836 (void)fts_close(fts);
1837 }
1838 #endif
1839
1840 /* print a ratio - size reduction as a fraction of uncompressed size */
1841 static void
1842 print_ratio(off_t in, off_t out, FILE *where)
1843 {
1844 int percent10; /* 10 * percent */
1845 off_t diff;
1846 char buff[8];
1847 int len;
1848
1849 diff = in - out/2;
1850 if (diff <= 0)
1851 /*
1852 * Output is more than double size of input! print -99.9%
1853 * Quite possibly we've failed to get the original size.
1854 */
1855 percent10 = -999;
1856 else {
1857 /*
1858 * We only need 12 bits of result from the final division,
1859 * so reduce the values until a 32bit division will suffice.
1860 */
1861 while (in > 0x100000) {
1862 diff >>= 1;
1863 in >>= 1;
1864 }
1865 if (in != 0)
1866 percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
1867 else
1868 percent10 = 0;
1869 }
1870
1871 len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
1872 /* Move the '.' to before the last digit */
1873 buff[len - 1] = buff[len - 2];
1874 buff[len - 2] = '.';
1875 fprintf(where, "%5s%%", buff);
1876 }
1877
1878 #ifndef SMALL
1879 /* print compression statistics, and the new name (if there is one!) */
1880 static void
1881 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
1882 {
1883 if (file)
1884 fprintf(stderr, "%s:%s ", file,
1885 strlen(file) < 7 ? "\t\t" : "\t");
1886 print_ratio(usize, gsize, stderr);
1887 if (nfile)
1888 fprintf(stderr, " -- replaced with %s", nfile);
1889 fprintf(stderr, "\n");
1890 fflush(stderr);
1891 }
1892
1893 /* print test results */
1894 static void
1895 print_test(const char *file, int ok)
1896 {
1897
1898 if (exit_value == 0 && ok == 0)
1899 exit_value = 1;
1900 fprintf(stderr, "%s:%s %s\n", file,
1901 strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
1902 fflush(stderr);
1903 }
1904 #endif
1905
1906 /* print a file's info ala --list */
1907 /* eg:
1908 compressed uncompressed ratio uncompressed_name
1909 354841 1679360 78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
1910 */
1911 static void
1912 print_list(int fd, off_t out, const char *outfile, time_t ts)
1913 {
1914 static int first = 1;
1915 #ifndef SMALL
1916 static off_t in_tot, out_tot;
1917 uint32_t crc = 0;
1918 #endif
1919 off_t in = 0, rv;
1920
1921 if (first) {
1922 #ifndef SMALL
1923 if (vflag)
1924 printf("method crc date time ");
1925 #endif
1926 if (qflag == 0)
1927 printf(" compressed uncompressed "
1928 "ratio uncompressed_name\n");
1929 }
1930 first = 0;
1931
1932 /* print totals? */
1933 #ifndef SMALL
1934 if (fd == -1) {
1935 in = in_tot;
1936 out = out_tot;
1937 } else
1938 #endif
1939 {
1940 /* read the last 4 bytes - this is the uncompressed size */
1941 rv = lseek(fd, (off_t)(-8), SEEK_END);
1942 if (rv != -1) {
1943 unsigned char buf[8];
1944 uint32_t usize;
1945
1946 rv = read(fd, (char *)buf, sizeof(buf));
1947 if (rv == -1)
1948 maybe_warn("read of uncompressed size");
1949 else if (rv != sizeof(buf))
1950 maybe_warnx("read of uncompressed size");
1951
1952 else {
1953 usize = buf[4] | buf[5] << 8 |
1954 buf[6] << 16 | buf[7] << 24;
1955 in = (off_t)usize;
1956 #ifndef SMALL
1957 crc = buf[0] | buf[1] << 8 |
1958 buf[2] << 16 | buf[3] << 24;
1959 #endif
1960 }
1961 }
1962 }
1963
1964 #ifndef SMALL
1965 if (vflag && fd == -1)
1966 printf(" ");
1967 else if (vflag) {
1968 char *date = ctime(&ts);
1969
1970 /* skip the day, 1/100th second, and year */
1971 date += 4;
1972 date[12] = 0;
1973 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
1974 }
1975 in_tot += in;
1976 out_tot += out;
1977 #endif
1978 printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
1979 print_ratio(in, out, stdout);
1980 printf(" %s\n", outfile);
1981 }
1982
1983 /* display the usage of NetBSD gzip */
1984 static void
1985 usage(void)
1986 {
1987
1988 fprintf(stderr, "%s\n", gzip_version);
1989 fprintf(stderr,
1990 #ifdef SMALL
1991 "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n",
1992 #else
1993 "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n"
1994 " -1 --fast fastest (worst) compression\n"
1995 " -2 .. -8 set compression level\n"
1996 " -9 --best best (slowest) compression\n"
1997 " -c --stdout write to stdout, keep original files\n"
1998 " --to-stdout\n"
1999 " -d --decompress uncompress files\n"
2000 " --uncompress\n"
2001 " -f --force force overwriting & compress links\n"
2002 " -h --help display this help\n"
2003 " -k --keep don't delete input files during operation\n"
2004 " -l --list list compressed file contents\n"
2005 " -N --name save or restore original file name and time stamp\n"
2006 " -n --no-name don't save original file name or time stamp\n"
2007 " -q --quiet output no warnings\n"
2008 " -r --recursive recursively compress files in directories\n"
2009 " -S .suf use suffix .suf instead of .gz\n"
2010 " --suffix .suf\n"
2011 " -t --test test compressed file\n"
2012 " -V --version display program version\n"
2013 " -v --verbose print extra statistics\n",
2014 #endif
2015 getprogname());
2016 exit(0);
2017 }
2018
2019 /* display the version of NetBSD gzip */
2020 static void
2021 display_version(void)
2022 {
2023
2024 fprintf(stderr, "%s\n", gzip_version);
2025 exit(0);
2026 }
2027
2028 #ifndef NO_BZIP2_SUPPORT
2029 #include "unbzip2.c"
2030 #endif
2031 #ifndef NO_COMPRESS_SUPPORT
2032 #include "zuncompress.c"
2033 #endif
2034 #ifndef NO_PACK_SUPPORT
2035 #include "unpack.c"
2036 #endif
2037
2038 static ssize_t
2039 read_retry(int fd, void *buf, size_t sz)
2040 {
2041 char *cp = buf;
2042 size_t left = MIN(sz, (size_t) SSIZE_MAX);
2043
2044 while (left > 0) {
2045 ssize_t ret;
2046
2047 ret = read(fd, cp, left);
2048 if (ret == -1) {
2049 return ret;
2050 } else if (ret == 0) {
2051 break; /* EOF */
2052 }
2053 cp += ret;
2054 left -= ret;
2055 }
2056
2057 return sz - left;
2058 }
DragonFly BSD