xref: /freebsd/usr.bin/gzip/gzip.c (revision e4f6a1bfa31a2299612bbf9dae402bb38d38b1df)
1 /*	$NetBSD: gzip.c,v 1.112 2017/08/23 13:04:17 christos Exp $	*/
2 
3 /*-
4  * SPDX-License-Identifier: BSD-2-Clause-NetBSD
5  *
6  * Copyright (c) 1997, 1998, 2003, 2004, 2006, 2008, 2009, 2010, 2011, 2015, 2017
7  *    Matthew R. Green
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  *
31  */
32 
33 #include <sys/cdefs.h>
34 #ifndef lint
35 __COPYRIGHT("@(#) Copyright (c) 1997, 1998, 2003, 2004, 2006, 2008,\
36  2009, 2010, 2011, 2015, 2017 Matthew R. Green.  All rights reserved.");
37 __FBSDID("$FreeBSD$");
38 #endif /* not lint */
39 
40 /*
41  * gzip.c -- GPL free gzip using zlib.
42  *
43  * RFC 1950 covers the zlib format
44  * RFC 1951 covers the deflate format
45  * RFC 1952 covers the gzip format
46  *
47  * TODO:
48  *	- use mmap where possible
49  *	- make bzip2/compress -v/-t/-l support work as well as possible
50  */
51 
52 #include <sys/param.h>
53 #include <sys/stat.h>
54 #include <sys/time.h>
55 
56 #include <inttypes.h>
57 #include <unistd.h>
58 #include <stdio.h>
59 #include <string.h>
60 #include <stdlib.h>
61 #include <err.h>
62 #include <errno.h>
63 #include <fcntl.h>
64 #include <zlib.h>
65 #include <fts.h>
66 #include <libgen.h>
67 #include <stdarg.h>
68 #include <getopt.h>
69 #include <time.h>
70 
71 /* what type of file are we dealing with */
72 enum filetype {
73 	FT_GZIP,
74 #ifndef NO_BZIP2_SUPPORT
75 	FT_BZIP2,
76 #endif
77 #ifndef NO_COMPRESS_SUPPORT
78 	FT_Z,
79 #endif
80 #ifndef NO_PACK_SUPPORT
81 	FT_PACK,
82 #endif
83 #ifndef NO_XZ_SUPPORT
84 	FT_XZ,
85 #endif
86 	FT_LAST,
87 	FT_UNKNOWN
88 };
89 
90 #ifndef NO_BZIP2_SUPPORT
91 #include <bzlib.h>
92 
93 #define BZ2_SUFFIX	".bz2"
94 #define BZIP2_MAGIC	"BZh"
95 #endif
96 
97 #ifndef NO_COMPRESS_SUPPORT
98 #define Z_SUFFIX	".Z"
99 #define Z_MAGIC		"\037\235"
100 #endif
101 
102 #ifndef NO_PACK_SUPPORT
103 #define PACK_MAGIC	"\037\036"
104 #endif
105 
106 #ifndef NO_XZ_SUPPORT
107 #include <lzma.h>
108 #define XZ_SUFFIX	".xz"
109 #define XZ_MAGIC	"\3757zXZ"
110 #endif
111 
112 #define GZ_SUFFIX	".gz"
113 
114 #define BUFLEN		(64 * 1024)
115 
116 #define GZIP_MAGIC0	0x1F
117 #define GZIP_MAGIC1	0x8B
118 #define GZIP_OMAGIC1	0x9E
119 
120 #define GZIP_TIMESTAMP	(off_t)4
121 #define GZIP_ORIGNAME	(off_t)10
122 
123 #define HEAD_CRC	0x02
124 #define EXTRA_FIELD	0x04
125 #define ORIG_NAME	0x08
126 #define COMMENT		0x10
127 
128 #define OS_CODE		3	/* Unix */
129 
130 typedef struct {
131     const char	*zipped;
132     int		ziplen;
133     const char	*normal;	/* for unzip - must not be longer than zipped */
134 } suffixes_t;
135 static suffixes_t suffixes[] = {
136 #define	SUFFIX(Z, N) {Z, sizeof Z - 1, N}
137 	SUFFIX(GZ_SUFFIX,	""),	/* Overwritten by -S .xxx */
138 #ifndef SMALL
139 	SUFFIX(GZ_SUFFIX,	""),
140 	SUFFIX(".z",		""),
141 	SUFFIX("-gz",		""),
142 	SUFFIX("-z",		""),
143 	SUFFIX("_z",		""),
144 	SUFFIX(".taz",		".tar"),
145 	SUFFIX(".tgz",		".tar"),
146 #ifndef NO_BZIP2_SUPPORT
147 	SUFFIX(BZ2_SUFFIX,	""),
148 	SUFFIX(".tbz",		".tar"),
149 	SUFFIX(".tbz2",		".tar"),
150 #endif
151 #ifndef NO_COMPRESS_SUPPORT
152 	SUFFIX(Z_SUFFIX,	""),
153 #endif
154 #ifndef NO_XZ_SUPPORT
155 	SUFFIX(XZ_SUFFIX,	""),
156 #endif
157 	SUFFIX(GZ_SUFFIX,	""),	/* Overwritten by -S "" */
158 #endif /* SMALL */
159 #undef SUFFIX
160 };
161 #define NUM_SUFFIXES (nitems(suffixes))
162 #define SUFFIX_MAXLEN	30
163 
164 static	const char	gzip_version[] = "FreeBSD gzip 20171121";
165 
166 #ifndef SMALL
167 static	const char	gzip_copyright[] = \
168 "   Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green\n"
169 "   All rights reserved.\n"
170 "\n"
171 "   Redistribution and use in source and binary forms, with or without\n"
172 "   modification, are permitted provided that the following conditions\n"
173 "   are met:\n"
174 "   1. Redistributions of source code must retain the above copyright\n"
175 "      notice, this list of conditions and the following disclaimer.\n"
176 "   2. Redistributions in binary form must reproduce the above copyright\n"
177 "      notice, this list of conditions and the following disclaimer in the\n"
178 "      documentation and/or other materials provided with the distribution.\n"
179 "\n"
180 "   THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n"
181 "   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n"
182 "   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n"
183 "   IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n"
184 "   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,\n"
185 "   BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n"
186 "   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED\n"
187 "   AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,\n"
188 "   OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\n"
189 "   OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\n"
190 "   SUCH DAMAGE.";
191 #endif
192 
193 static	int	cflag;			/* stdout mode */
194 static	int	dflag;			/* decompress mode */
195 static	int	lflag;			/* list mode */
196 static	int	numflag = 6;		/* gzip -1..-9 value */
197 
198 static	const char *remove_file = NULL;	/* file to be removed upon SIGINT */
199 
200 static	int	fflag;			/* force mode */
201 #ifndef SMALL
202 static	int	kflag;			/* don't delete input files */
203 static	int	nflag;			/* don't save name/timestamp */
204 static	int	Nflag;			/* don't restore name/timestamp */
205 static	int	qflag;			/* quiet mode */
206 static	int	rflag;			/* recursive mode */
207 static	int	tflag;			/* test */
208 static	int	vflag;			/* verbose mode */
209 static	sig_atomic_t print_info = 0;
210 #else
211 #define		qflag	0
212 #define		tflag	0
213 #endif
214 
215 static	int	exit_value = 0;		/* exit value */
216 
217 static	const char *infile;		/* name of file coming in */
218 
219 static	void	maybe_err(const char *fmt, ...) __printflike(1, 2) __dead2;
220 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) ||	\
221     !defined(NO_XZ_SUPPORT)
222 static	void	maybe_errx(const char *fmt, ...) __printflike(1, 2) __dead2;
223 #endif
224 static	void	maybe_warn(const char *fmt, ...) __printflike(1, 2);
225 static	void	maybe_warnx(const char *fmt, ...) __printflike(1, 2);
226 static	enum filetype file_gettype(u_char *);
227 #ifdef SMALL
228 #define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz)
229 #endif
230 static	off_t	gz_compress(int, int, off_t *, const char *, uint32_t);
231 static	off_t	gz_uncompress(int, int, char *, size_t, off_t *, const char *);
232 static	off_t	file_compress(char *, char *, size_t);
233 static	off_t	file_uncompress(char *, char *, size_t);
234 static	void	handle_pathname(char *);
235 static	void	handle_file(char *, struct stat *);
236 static	void	handle_stdin(void);
237 static	void	handle_stdout(void);
238 static	void	print_ratio(off_t, off_t, FILE *);
239 static	void	print_list(int fd, off_t, const char *, time_t);
240 static	void	usage(void) __dead2;
241 static	void	display_version(void) __dead2;
242 #ifndef SMALL
243 static	void	display_license(void);
244 #endif
245 static	const suffixes_t *check_suffix(char *, int);
246 static	ssize_t	read_retry(int, void *, size_t);
247 static	ssize_t	write_retry(int, const void *, size_t);
248 
249 #ifdef SMALL
250 #define infile_set(f,t) infile_set(f)
251 #endif
252 static	void	infile_set(const char *newinfile, off_t total);
253 
254 #ifdef SMALL
255 #define unlink_input(f, sb) unlink(f)
256 #define check_siginfo() /* nothing */
257 #define setup_signals() /* nothing */
258 #define infile_newdata(t) /* nothing */
259 #else
260 static	off_t	infile_total;		/* total expected to read/write */
261 static	off_t	infile_current;		/* current read/write */
262 
263 static	void	check_siginfo(void);
264 static	off_t	cat_fd(unsigned char *, size_t, off_t *, int fd);
265 static	void	prepend_gzip(char *, int *, char ***);
266 static	void	handle_dir(char *);
267 static	void	print_verbage(const char *, const char *, off_t, off_t);
268 static	void	print_test(const char *, int);
269 static	void	copymodes(int fd, const struct stat *, const char *file);
270 static	int	check_outfile(const char *outfile);
271 static	void	setup_signals(void);
272 static	void	infile_newdata(size_t newdata);
273 static	void	infile_clear(void);
274 #endif
275 
276 #ifndef NO_BZIP2_SUPPORT
277 static	off_t	unbzip2(int, int, char *, size_t, off_t *);
278 #endif
279 
280 #ifndef NO_COMPRESS_SUPPORT
281 static	FILE 	*zdopen(int);
282 static	off_t	zuncompress(FILE *, FILE *, char *, size_t, off_t *);
283 #endif
284 
285 #ifndef NO_PACK_SUPPORT
286 static	off_t	unpack(int, int, char *, size_t, off_t *);
287 #endif
288 
289 #ifndef NO_XZ_SUPPORT
290 static	off_t	unxz(int, int, char *, size_t, off_t *);
291 #endif
292 
293 #ifdef SMALL
294 #define getopt_long(a,b,c,d,e) getopt(a,b,c)
295 #else
296 static const struct option longopts[] = {
297 	{ "stdout",		no_argument,		0,	'c' },
298 	{ "to-stdout",		no_argument,		0,	'c' },
299 	{ "decompress",		no_argument,		0,	'd' },
300 	{ "uncompress",		no_argument,		0,	'd' },
301 	{ "force",		no_argument,		0,	'f' },
302 	{ "help",		no_argument,		0,	'h' },
303 	{ "keep",		no_argument,		0,	'k' },
304 	{ "list",		no_argument,		0,	'l' },
305 	{ "no-name",		no_argument,		0,	'n' },
306 	{ "name",		no_argument,		0,	'N' },
307 	{ "quiet",		no_argument,		0,	'q' },
308 	{ "recursive",		no_argument,		0,	'r' },
309 	{ "suffix",		required_argument,	0,	'S' },
310 	{ "test",		no_argument,		0,	't' },
311 	{ "verbose",		no_argument,		0,	'v' },
312 	{ "version",		no_argument,		0,	'V' },
313 	{ "fast",		no_argument,		0,	'1' },
314 	{ "best",		no_argument,		0,	'9' },
315 	{ "ascii",		no_argument,		0,	'a' },
316 	{ "license",		no_argument,		0,	'L' },
317 	{ NULL,			no_argument,		0,	0 },
318 };
319 #endif
320 
321 int
322 main(int argc, char **argv)
323 {
324 	const char *progname = getprogname();
325 #ifndef SMALL
326 	char *gzip;
327 	int len;
328 #endif
329 	int ch;
330 
331 	setup_signals();
332 
333 #ifndef SMALL
334 	if ((gzip = getenv("GZIP")) != NULL)
335 		prepend_gzip(gzip, &argc, &argv);
336 #endif
337 
338 	/*
339 	 * XXX
340 	 * handle being called `gunzip', `zcat' and `gzcat'
341 	 */
342 	if (strcmp(progname, "gunzip") == 0)
343 		dflag = 1;
344 	else if (strcmp(progname, "zcat") == 0 ||
345 		 strcmp(progname, "gzcat") == 0)
346 		dflag = cflag = 1;
347 
348 #ifdef SMALL
349 #define OPT_LIST "123456789cdhlV"
350 #else
351 #define OPT_LIST "123456789acdfhklLNnqrS:tVv"
352 #endif
353 
354 	while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) {
355 		switch (ch) {
356 		case '1': case '2': case '3':
357 		case '4': case '5': case '6':
358 		case '7': case '8': case '9':
359 			numflag = ch - '0';
360 			break;
361 		case 'c':
362 			cflag = 1;
363 			break;
364 		case 'd':
365 			dflag = 1;
366 			break;
367 		case 'l':
368 			lflag = 1;
369 			dflag = 1;
370 			break;
371 		case 'V':
372 			display_version();
373 			/* NOTREACHED */
374 #ifndef SMALL
375 		case 'a':
376 			fprintf(stderr, "%s: option --ascii ignored on this system\n", progname);
377 			break;
378 		case 'f':
379 			fflag = 1;
380 			break;
381 		case 'k':
382 			kflag = 1;
383 			break;
384 		case 'L':
385 			display_license();
386 			/* NOT REACHED */
387 		case 'N':
388 			nflag = 0;
389 			Nflag = 1;
390 			break;
391 		case 'n':
392 			nflag = 1;
393 			Nflag = 0;
394 			break;
395 		case 'q':
396 			qflag = 1;
397 			break;
398 		case 'r':
399 			rflag = 1;
400 			break;
401 		case 'S':
402 			len = strlen(optarg);
403 			if (len != 0) {
404 				if (len > SUFFIX_MAXLEN)
405 					errx(1, "incorrect suffix: '%s': too long", optarg);
406 				suffixes[0].zipped = optarg;
407 				suffixes[0].ziplen = len;
408 			} else {
409 				suffixes[NUM_SUFFIXES - 1].zipped = "";
410 				suffixes[NUM_SUFFIXES - 1].ziplen = 0;
411 			}
412 			break;
413 		case 't':
414 			cflag = 1;
415 			tflag = 1;
416 			dflag = 1;
417 			break;
418 		case 'v':
419 			vflag = 1;
420 			break;
421 #endif
422 		default:
423 			usage();
424 			/* NOTREACHED */
425 		}
426 	}
427 	argv += optind;
428 	argc -= optind;
429 
430 	if (argc == 0) {
431 		if (dflag)	/* stdin mode */
432 			handle_stdin();
433 		else		/* stdout mode */
434 			handle_stdout();
435 	} else {
436 		do {
437 			handle_pathname(argv[0]);
438 		} while (*++argv);
439 	}
440 #ifndef SMALL
441 	if (qflag == 0 && lflag && argc > 1)
442 		print_list(-1, 0, "(totals)", 0);
443 #endif
444 	exit(exit_value);
445 }
446 
447 /* maybe print a warning */
448 void
449 maybe_warn(const char *fmt, ...)
450 {
451 	va_list ap;
452 
453 	if (qflag == 0) {
454 		va_start(ap, fmt);
455 		vwarn(fmt, ap);
456 		va_end(ap);
457 	}
458 	if (exit_value == 0)
459 		exit_value = 1;
460 }
461 
462 /* ... without an errno. */
463 void
464 maybe_warnx(const char *fmt, ...)
465 {
466 	va_list ap;
467 
468 	if (qflag == 0) {
469 		va_start(ap, fmt);
470 		vwarnx(fmt, ap);
471 		va_end(ap);
472 	}
473 	if (exit_value == 0)
474 		exit_value = 1;
475 }
476 
477 /* maybe print an error */
478 void
479 maybe_err(const char *fmt, ...)
480 {
481 	va_list ap;
482 
483 	if (qflag == 0) {
484 		va_start(ap, fmt);
485 		vwarn(fmt, ap);
486 		va_end(ap);
487 	}
488 	exit(2);
489 }
490 
491 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) ||	\
492     !defined(NO_XZ_SUPPORT)
493 /* ... without an errno. */
494 void
495 maybe_errx(const char *fmt, ...)
496 {
497 	va_list ap;
498 
499 	if (qflag == 0) {
500 		va_start(ap, fmt);
501 		vwarnx(fmt, ap);
502 		va_end(ap);
503 	}
504 	exit(2);
505 }
506 #endif
507 
508 #ifndef SMALL
509 /* split up $GZIP and prepend it to the argument list */
510 static void
511 prepend_gzip(char *gzip, int *argc, char ***argv)
512 {
513 	char *s, **nargv, **ac;
514 	int nenvarg = 0, i;
515 
516 	/* scan how many arguments there are */
517 	for (s = gzip;;) {
518 		while (*s == ' ' || *s == '\t')
519 			s++;
520 		if (*s == 0)
521 			goto count_done;
522 		nenvarg++;
523 		while (*s != ' ' && *s != '\t')
524 			if (*s++ == 0)
525 				goto count_done;
526 	}
527 count_done:
528 	/* punt early */
529 	if (nenvarg == 0)
530 		return;
531 
532 	*argc += nenvarg;
533 	ac = *argv;
534 
535 	nargv = (char **)malloc((*argc + 1) * sizeof(char *));
536 	if (nargv == NULL)
537 		maybe_err("malloc");
538 
539 	/* stash this away */
540 	*argv = nargv;
541 
542 	/* copy the program name first */
543 	i = 0;
544 	nargv[i++] = *(ac++);
545 
546 	/* take a copy of $GZIP and add it to the array */
547 	s = strdup(gzip);
548 	if (s == NULL)
549 		maybe_err("strdup");
550 	for (;;) {
551 		/* Skip whitespaces. */
552 		while (*s == ' ' || *s == '\t')
553 			s++;
554 		if (*s == 0)
555 			goto copy_done;
556 		nargv[i++] = s;
557 		/* Find the end of this argument. */
558 		while (*s != ' ' && *s != '\t')
559 			if (*s++ == 0)
560 				/* Argument followed by NUL. */
561 				goto copy_done;
562 		/* Terminate by overwriting ' ' or '\t' with NUL. */
563 		*s++ = 0;
564 	}
565 copy_done:
566 
567 	/* copy the original arguments and a NULL */
568 	while (*ac)
569 		nargv[i++] = *(ac++);
570 	nargv[i] = NULL;
571 }
572 #endif
573 
574 /* compress input to output. Return bytes read, -1 on error */
575 static off_t
576 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime)
577 {
578 	z_stream z;
579 	char *outbufp, *inbufp;
580 	off_t in_tot = 0, out_tot = 0;
581 	ssize_t in_size;
582 	int i, error;
583 	uLong crc;
584 #ifdef SMALL
585 	static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0,
586 				 0, 0, 0, 0,
587 				 0, OS_CODE };
588 #endif
589 
590 	outbufp = malloc(BUFLEN);
591 	inbufp = malloc(BUFLEN);
592 	if (outbufp == NULL || inbufp == NULL) {
593 		maybe_err("malloc failed");
594 		goto out;
595 	}
596 
597 	memset(&z, 0, sizeof z);
598 	z.zalloc = Z_NULL;
599 	z.zfree = Z_NULL;
600 	z.opaque = 0;
601 
602 #ifdef SMALL
603 	memcpy(outbufp, header, sizeof header);
604 	i = sizeof header;
605 #else
606 	if (nflag != 0) {
607 		mtime = 0;
608 		origname = "";
609 	}
610 
611 	i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s",
612 		     GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED,
613 		     *origname ? ORIG_NAME : 0,
614 		     mtime & 0xff,
615 		     (mtime >> 8) & 0xff,
616 		     (mtime >> 16) & 0xff,
617 		     (mtime >> 24) & 0xff,
618 		     numflag == 1 ? 4 : numflag == 9 ? 2 : 0,
619 		     OS_CODE, origname);
620 	if (i >= BUFLEN)
621 		/* this need PATH_MAX > BUFLEN ... */
622 		maybe_err("snprintf");
623 	if (*origname)
624 		i++;
625 #endif
626 
627 	z.next_out = (unsigned char *)outbufp + i;
628 	z.avail_out = BUFLEN - i;
629 
630 	error = deflateInit2(&z, numflag, Z_DEFLATED,
631 			     (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY);
632 	if (error != Z_OK) {
633 		maybe_warnx("deflateInit2 failed");
634 		in_tot = -1;
635 		goto out;
636 	}
637 
638 	crc = crc32(0L, Z_NULL, 0);
639 	for (;;) {
640 		if (z.avail_out == 0) {
641 			if (write_retry(out, outbufp, BUFLEN) != BUFLEN) {
642 				maybe_warn("write");
643 				out_tot = -1;
644 				goto out;
645 			}
646 
647 			out_tot += BUFLEN;
648 			z.next_out = (unsigned char *)outbufp;
649 			z.avail_out = BUFLEN;
650 		}
651 
652 		if (z.avail_in == 0) {
653 			in_size = read(in, inbufp, BUFLEN);
654 			if (in_size < 0) {
655 				maybe_warn("read");
656 				in_tot = -1;
657 				goto out;
658 			}
659 			if (in_size == 0)
660 				break;
661 			infile_newdata(in_size);
662 
663 			crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size);
664 			in_tot += in_size;
665 			z.next_in = (unsigned char *)inbufp;
666 			z.avail_in = in_size;
667 		}
668 
669 		error = deflate(&z, Z_NO_FLUSH);
670 		if (error != Z_OK && error != Z_STREAM_END) {
671 			maybe_warnx("deflate failed");
672 			in_tot = -1;
673 			goto out;
674 		}
675 	}
676 
677 	/* clean up */
678 	for (;;) {
679 		size_t len;
680 		ssize_t w;
681 
682 		error = deflate(&z, Z_FINISH);
683 		if (error != Z_OK && error != Z_STREAM_END) {
684 			maybe_warnx("deflate failed");
685 			in_tot = -1;
686 			goto out;
687 		}
688 
689 		len = (char *)z.next_out - outbufp;
690 
691 		w = write_retry(out, outbufp, len);
692 		if (w == -1 || (size_t)w != len) {
693 			maybe_warn("write");
694 			out_tot = -1;
695 			goto out;
696 		}
697 		out_tot += len;
698 		z.next_out = (unsigned char *)outbufp;
699 		z.avail_out = BUFLEN;
700 
701 		if (error == Z_STREAM_END)
702 			break;
703 	}
704 
705 	if (deflateEnd(&z) != Z_OK) {
706 		maybe_warnx("deflateEnd failed");
707 		in_tot = -1;
708 		goto out;
709 	}
710 
711 	i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c",
712 		 (int)crc & 0xff,
713 		 (int)(crc >> 8) & 0xff,
714 		 (int)(crc >> 16) & 0xff,
715 		 (int)(crc >> 24) & 0xff,
716 		 (int)in_tot & 0xff,
717 		 (int)(in_tot >> 8) & 0xff,
718 		 (int)(in_tot >> 16) & 0xff,
719 		 (int)(in_tot >> 24) & 0xff);
720 	if (i != 8)
721 		maybe_err("snprintf");
722 	if (write_retry(out, outbufp, i) != i) {
723 		maybe_warn("write");
724 		in_tot = -1;
725 	} else
726 		out_tot += i;
727 
728 out:
729 	if (inbufp != NULL)
730 		free(inbufp);
731 	if (outbufp != NULL)
732 		free(outbufp);
733 	if (gsizep)
734 		*gsizep = out_tot;
735 	return in_tot;
736 }
737 
738 /*
739  * uncompress input to output then close the input.  return the
740  * uncompressed size written, and put the compressed sized read
741  * into `*gsizep'.
742  */
743 static off_t
744 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
745 	      const char *filename)
746 {
747 	z_stream z;
748 	char *outbufp, *inbufp;
749 	off_t out_tot = -1, in_tot = 0;
750 	uint32_t out_sub_tot = 0;
751 	enum {
752 		GZSTATE_MAGIC0,
753 		GZSTATE_MAGIC1,
754 		GZSTATE_METHOD,
755 		GZSTATE_FLAGS,
756 		GZSTATE_SKIPPING,
757 		GZSTATE_EXTRA,
758 		GZSTATE_EXTRA2,
759 		GZSTATE_EXTRA3,
760 		GZSTATE_ORIGNAME,
761 		GZSTATE_COMMENT,
762 		GZSTATE_HEAD_CRC1,
763 		GZSTATE_HEAD_CRC2,
764 		GZSTATE_INIT,
765 		GZSTATE_READ,
766 		GZSTATE_CRC,
767 		GZSTATE_LEN,
768 	} state = GZSTATE_MAGIC0;
769 	int flags = 0, skip_count = 0;
770 	int error = Z_STREAM_ERROR, done_reading = 0;
771 	uLong crc = 0;
772 	ssize_t wr;
773 	int needmore = 0;
774 
775 #define ADVANCE()       { z.next_in++; z.avail_in--; }
776 
777 	if ((outbufp = malloc(BUFLEN)) == NULL) {
778 		maybe_err("malloc failed");
779 		goto out2;
780 	}
781 	if ((inbufp = malloc(BUFLEN)) == NULL) {
782 		maybe_err("malloc failed");
783 		goto out1;
784 	}
785 
786 	memset(&z, 0, sizeof z);
787 	z.avail_in = prelen;
788 	z.next_in = (unsigned char *)pre;
789 	z.avail_out = BUFLEN;
790 	z.next_out = (unsigned char *)outbufp;
791 	z.zalloc = NULL;
792 	z.zfree = NULL;
793 	z.opaque = 0;
794 
795 	in_tot = prelen;
796 	out_tot = 0;
797 
798 	for (;;) {
799 		check_siginfo();
800 		if ((z.avail_in == 0 || needmore) && done_reading == 0) {
801 			ssize_t in_size;
802 
803 			if (z.avail_in > 0) {
804 				memmove(inbufp, z.next_in, z.avail_in);
805 			}
806 			z.next_in = (unsigned char *)inbufp;
807 			in_size = read(in, z.next_in + z.avail_in,
808 			    BUFLEN - z.avail_in);
809 
810 			if (in_size == -1) {
811 				maybe_warn("failed to read stdin");
812 				goto stop_and_fail;
813 			} else if (in_size == 0) {
814 				done_reading = 1;
815 			}
816 			infile_newdata(in_size);
817 
818 			z.avail_in += in_size;
819 			needmore = 0;
820 
821 			in_tot += in_size;
822 		}
823 		if (z.avail_in == 0) {
824 			if (done_reading && state != GZSTATE_MAGIC0) {
825 				maybe_warnx("%s: unexpected end of file",
826 					    filename);
827 				goto stop_and_fail;
828 			}
829 			goto stop;
830 		}
831 		switch (state) {
832 		case GZSTATE_MAGIC0:
833 			if (*z.next_in != GZIP_MAGIC0) {
834 				if (in_tot > 0) {
835 					maybe_warnx("%s: trailing garbage "
836 						    "ignored", filename);
837 					exit_value = 2;
838 					goto stop;
839 				}
840 				maybe_warnx("input not gziped (MAGIC0)");
841 				goto stop_and_fail;
842 			}
843 			ADVANCE();
844 			state++;
845 			out_sub_tot = 0;
846 			crc = crc32(0L, Z_NULL, 0);
847 			break;
848 
849 		case GZSTATE_MAGIC1:
850 			if (*z.next_in != GZIP_MAGIC1 &&
851 			    *z.next_in != GZIP_OMAGIC1) {
852 				maybe_warnx("input not gziped (MAGIC1)");
853 				goto stop_and_fail;
854 			}
855 			ADVANCE();
856 			state++;
857 			break;
858 
859 		case GZSTATE_METHOD:
860 			if (*z.next_in != Z_DEFLATED) {
861 				maybe_warnx("unknown compression method");
862 				goto stop_and_fail;
863 			}
864 			ADVANCE();
865 			state++;
866 			break;
867 
868 		case GZSTATE_FLAGS:
869 			flags = *z.next_in;
870 			ADVANCE();
871 			skip_count = 6;
872 			state++;
873 			break;
874 
875 		case GZSTATE_SKIPPING:
876 			if (skip_count > 0) {
877 				skip_count--;
878 				ADVANCE();
879 			} else
880 				state++;
881 			break;
882 
883 		case GZSTATE_EXTRA:
884 			if ((flags & EXTRA_FIELD) == 0) {
885 				state = GZSTATE_ORIGNAME;
886 				break;
887 			}
888 			skip_count = *z.next_in;
889 			ADVANCE();
890 			state++;
891 			break;
892 
893 		case GZSTATE_EXTRA2:
894 			skip_count |= ((*z.next_in) << 8);
895 			ADVANCE();
896 			state++;
897 			break;
898 
899 		case GZSTATE_EXTRA3:
900 			if (skip_count > 0) {
901 				skip_count--;
902 				ADVANCE();
903 			} else
904 				state++;
905 			break;
906 
907 		case GZSTATE_ORIGNAME:
908 			if ((flags & ORIG_NAME) == 0) {
909 				state++;
910 				break;
911 			}
912 			if (*z.next_in == 0)
913 				state++;
914 			ADVANCE();
915 			break;
916 
917 		case GZSTATE_COMMENT:
918 			if ((flags & COMMENT) == 0) {
919 				state++;
920 				break;
921 			}
922 			if (*z.next_in == 0)
923 				state++;
924 			ADVANCE();
925 			break;
926 
927 		case GZSTATE_HEAD_CRC1:
928 			if (flags & HEAD_CRC)
929 				skip_count = 2;
930 			else
931 				skip_count = 0;
932 			state++;
933 			break;
934 
935 		case GZSTATE_HEAD_CRC2:
936 			if (skip_count > 0) {
937 				skip_count--;
938 				ADVANCE();
939 			} else
940 				state++;
941 			break;
942 
943 		case GZSTATE_INIT:
944 			if (inflateInit2(&z, -MAX_WBITS) != Z_OK) {
945 				maybe_warnx("failed to inflateInit");
946 				goto stop_and_fail;
947 			}
948 			state++;
949 			break;
950 
951 		case GZSTATE_READ:
952 			error = inflate(&z, Z_FINISH);
953 			switch (error) {
954 			/* Z_BUF_ERROR goes with Z_FINISH... */
955 			case Z_BUF_ERROR:
956 				if (z.avail_out > 0 && !done_reading)
957 					continue;
958 
959 			case Z_STREAM_END:
960 			case Z_OK:
961 				break;
962 
963 			case Z_NEED_DICT:
964 				maybe_warnx("Z_NEED_DICT error");
965 				goto stop_and_fail;
966 			case Z_DATA_ERROR:
967 				maybe_warnx("data stream error");
968 				goto stop_and_fail;
969 			case Z_STREAM_ERROR:
970 				maybe_warnx("internal stream error");
971 				goto stop_and_fail;
972 			case Z_MEM_ERROR:
973 				maybe_warnx("memory allocation error");
974 				goto stop_and_fail;
975 
976 			default:
977 				maybe_warn("unknown error from inflate(): %d",
978 				    error);
979 			}
980 			wr = BUFLEN - z.avail_out;
981 
982 			if (wr != 0) {
983 				crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr);
984 				if (
985 #ifndef SMALL
986 				    /* don't write anything with -t */
987 				    tflag == 0 &&
988 #endif
989 				    write_retry(out, outbufp, wr) != wr) {
990 					maybe_warn("error writing to output");
991 					goto stop_and_fail;
992 				}
993 
994 				out_tot += wr;
995 				out_sub_tot += wr;
996 			}
997 
998 			if (error == Z_STREAM_END) {
999 				inflateEnd(&z);
1000 				state++;
1001 			}
1002 
1003 			z.next_out = (unsigned char *)outbufp;
1004 			z.avail_out = BUFLEN;
1005 
1006 			break;
1007 		case GZSTATE_CRC:
1008 			{
1009 				uLong origcrc;
1010 
1011 				if (z.avail_in < 4) {
1012 					if (!done_reading) {
1013 						needmore = 1;
1014 						continue;
1015 					}
1016 					maybe_warnx("truncated input");
1017 					goto stop_and_fail;
1018 				}
1019 				origcrc = ((unsigned)z.next_in[0] & 0xff) |
1020 					((unsigned)z.next_in[1] & 0xff) << 8 |
1021 					((unsigned)z.next_in[2] & 0xff) << 16 |
1022 					((unsigned)z.next_in[3] & 0xff) << 24;
1023 				if (origcrc != crc) {
1024 					maybe_warnx("invalid compressed"
1025 					     " data--crc error");
1026 					goto stop_and_fail;
1027 				}
1028 			}
1029 
1030 			z.avail_in -= 4;
1031 			z.next_in += 4;
1032 
1033 			if (!z.avail_in && done_reading) {
1034 				goto stop;
1035 			}
1036 			state++;
1037 			break;
1038 		case GZSTATE_LEN:
1039 			{
1040 				uLong origlen;
1041 
1042 				if (z.avail_in < 4) {
1043 					if (!done_reading) {
1044 						needmore = 1;
1045 						continue;
1046 					}
1047 					maybe_warnx("truncated input");
1048 					goto stop_and_fail;
1049 				}
1050 				origlen = ((unsigned)z.next_in[0] & 0xff) |
1051 					((unsigned)z.next_in[1] & 0xff) << 8 |
1052 					((unsigned)z.next_in[2] & 0xff) << 16 |
1053 					((unsigned)z.next_in[3] & 0xff) << 24;
1054 
1055 				if (origlen != out_sub_tot) {
1056 					maybe_warnx("invalid compressed"
1057 					     " data--length error");
1058 					goto stop_and_fail;
1059 				}
1060 			}
1061 
1062 			z.avail_in -= 4;
1063 			z.next_in += 4;
1064 
1065 			if (error < 0) {
1066 				maybe_warnx("decompression error");
1067 				goto stop_and_fail;
1068 			}
1069 			state = GZSTATE_MAGIC0;
1070 			break;
1071 		}
1072 		continue;
1073 stop_and_fail:
1074 		out_tot = -1;
1075 stop:
1076 		break;
1077 	}
1078 	if (state > GZSTATE_INIT)
1079 		inflateEnd(&z);
1080 
1081 	free(inbufp);
1082 out1:
1083 	free(outbufp);
1084 out2:
1085 	if (gsizep)
1086 		*gsizep = in_tot;
1087 	return (out_tot);
1088 }
1089 
1090 #ifndef SMALL
1091 /*
1092  * set the owner, mode, flags & utimes using the given file descriptor.
1093  * file is only used in possible warning messages.
1094  */
1095 static void
1096 copymodes(int fd, const struct stat *sbp, const char *file)
1097 {
1098 	struct timespec times[2];
1099 	struct stat sb;
1100 
1101 	/*
1102 	 * If we have no info on the input, give this file some
1103 	 * default values and return..
1104 	 */
1105 	if (sbp == NULL) {
1106 		mode_t mask = umask(022);
1107 
1108 		(void)fchmod(fd, DEFFILEMODE & ~mask);
1109 		(void)umask(mask);
1110 		return;
1111 	}
1112 	sb = *sbp;
1113 
1114 	/* if the chown fails, remove set-id bits as-per compress(1) */
1115 	if (fchown(fd, sb.st_uid, sb.st_gid) < 0) {
1116 		if (errno != EPERM)
1117 			maybe_warn("couldn't fchown: %s", file);
1118 		sb.st_mode &= ~(S_ISUID|S_ISGID);
1119 	}
1120 
1121 	/* we only allow set-id and the 9 normal permission bits */
1122 	sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
1123 	if (fchmod(fd, sb.st_mode) < 0)
1124 		maybe_warn("couldn't fchmod: %s", file);
1125 
1126 	times[0] = sb.st_atim;
1127 	times[1] = sb.st_mtim;
1128 	if (futimens(fd, times) < 0)
1129 		maybe_warn("couldn't futimens: %s", file);
1130 
1131 	/* only try flags if they exist already */
1132         if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0)
1133 		maybe_warn("couldn't fchflags: %s", file);
1134 }
1135 #endif
1136 
1137 /* what sort of file is this? */
1138 static enum filetype
1139 file_gettype(u_char *buf)
1140 {
1141 
1142 	if (buf[0] == GZIP_MAGIC0 &&
1143 	    (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
1144 		return FT_GZIP;
1145 	else
1146 #ifndef NO_BZIP2_SUPPORT
1147 	if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
1148 	    buf[3] >= '0' && buf[3] <= '9')
1149 		return FT_BZIP2;
1150 	else
1151 #endif
1152 #ifndef NO_COMPRESS_SUPPORT
1153 	if (memcmp(buf, Z_MAGIC, 2) == 0)
1154 		return FT_Z;
1155 	else
1156 #endif
1157 #ifndef NO_PACK_SUPPORT
1158 	if (memcmp(buf, PACK_MAGIC, 2) == 0)
1159 		return FT_PACK;
1160 	else
1161 #endif
1162 #ifndef NO_XZ_SUPPORT
1163 	if (memcmp(buf, XZ_MAGIC, 4) == 0)	/* XXX: We only have 4 bytes */
1164 		return FT_XZ;
1165 	else
1166 #endif
1167 		return FT_UNKNOWN;
1168 }
1169 
1170 #ifndef SMALL
1171 /* check the outfile is OK. */
1172 static int
1173 check_outfile(const char *outfile)
1174 {
1175 	struct stat sb;
1176 	int ok = 1;
1177 
1178 	if (lflag == 0 && stat(outfile, &sb) == 0) {
1179 		if (fflag)
1180 			unlink(outfile);
1181 		else if (isatty(STDIN_FILENO)) {
1182 			char ans[10] = { 'n', '\0' };	/* default */
1183 
1184 			fprintf(stderr, "%s already exists -- do you wish to "
1185 					"overwrite (y or n)? " , outfile);
1186 			(void)fgets(ans, sizeof(ans) - 1, stdin);
1187 			if (ans[0] != 'y' && ans[0] != 'Y') {
1188 				fprintf(stderr, "\tnot overwriting\n");
1189 				ok = 0;
1190 			} else
1191 				unlink(outfile);
1192 		} else {
1193 			maybe_warnx("%s already exists -- skipping", outfile);
1194 			ok = 0;
1195 		}
1196 	}
1197 	return ok;
1198 }
1199 
1200 static void
1201 unlink_input(const char *file, const struct stat *sb)
1202 {
1203 	struct stat nsb;
1204 
1205 	if (kflag)
1206 		return;
1207 	if (stat(file, &nsb) != 0)
1208 		/* Must be gone already */
1209 		return;
1210 	if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
1211 		/* Definitely a different file */
1212 		return;
1213 	unlink(file);
1214 }
1215 
1216 static void
1217 got_sigint(int signo __unused)
1218 {
1219 
1220 	if (remove_file != NULL)
1221 		unlink(remove_file);
1222 	_exit(2);
1223 }
1224 
1225 static void
1226 got_siginfo(int signo __unused)
1227 {
1228 
1229 	print_info = 1;
1230 }
1231 
1232 static void
1233 setup_signals(void)
1234 {
1235 
1236 	signal(SIGINFO, got_siginfo);
1237 	signal(SIGINT, got_sigint);
1238 }
1239 
1240 static	void
1241 infile_newdata(size_t newdata)
1242 {
1243 
1244 	infile_current += newdata;
1245 }
1246 #endif
1247 
1248 static	void
1249 infile_set(const char *newinfile, off_t total)
1250 {
1251 
1252 	if (newinfile)
1253 		infile = newinfile;
1254 #ifndef SMALL
1255 	infile_total = total;
1256 #endif
1257 }
1258 
1259 static	void
1260 infile_clear(void)
1261 {
1262 
1263 	infile = NULL;
1264 #ifndef SMALL
1265 	infile_total = infile_current = 0;
1266 #endif
1267 }
1268 
1269 static const suffixes_t *
1270 check_suffix(char *file, int xlate)
1271 {
1272 	const suffixes_t *s;
1273 	int len = strlen(file);
1274 	char *sp;
1275 
1276 	for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
1277 		/* if it doesn't fit in "a.suf", don't bother */
1278 		if (s->ziplen >= len)
1279 			continue;
1280 		sp = file + len - s->ziplen;
1281 		if (strcmp(s->zipped, sp) != 0)
1282 			continue;
1283 		if (xlate)
1284 			strcpy(sp, s->normal);
1285 		return s;
1286 	}
1287 	return NULL;
1288 }
1289 
1290 /*
1291  * compress the given file: create a corresponding .gz file and remove the
1292  * original.
1293  */
1294 static off_t
1295 file_compress(char *file, char *outfile, size_t outsize)
1296 {
1297 	int in;
1298 	int out;
1299 	off_t size, in_size;
1300 #ifndef SMALL
1301 	struct stat isb, osb;
1302 	const suffixes_t *suff;
1303 #endif
1304 
1305 	in = open(file, O_RDONLY);
1306 	if (in == -1) {
1307 		maybe_warn("can't open %s", file);
1308 		return (-1);
1309 	}
1310 
1311 #ifndef SMALL
1312 	if (fstat(in, &isb) != 0) {
1313 		maybe_warn("couldn't stat: %s", file);
1314 		close(in);
1315 		return (-1);
1316 	}
1317 #endif
1318 
1319 #ifndef SMALL
1320 	if (fstat(in, &isb) != 0) {
1321 		close(in);
1322 		maybe_warn("can't stat %s", file);
1323 		return -1;
1324 	}
1325 	infile_set(file, isb.st_size);
1326 #endif
1327 
1328 	if (cflag == 0) {
1329 #ifndef SMALL
1330 		if (isb.st_nlink > 1 && fflag == 0) {
1331 			maybe_warnx("%s has %ju other link%s -- "
1332 				    "skipping", file,
1333 				    (uintmax_t)isb.st_nlink - 1,
1334 				    isb.st_nlink == 1 ? "" : "s");
1335 			close(in);
1336 			return -1;
1337 		}
1338 
1339 		if (fflag == 0 && (suff = check_suffix(file, 0)) &&
1340 		    suff->zipped[0] != 0) {
1341 			maybe_warnx("%s already has %s suffix -- unchanged",
1342 			    file, suff->zipped);
1343 			close(in);
1344 			return (-1);
1345 		}
1346 #endif
1347 
1348 		/* Add (usually) .gz to filename */
1349 		if ((size_t)snprintf(outfile, outsize, "%s%s",
1350 		    file, suffixes[0].zipped) >= outsize)
1351 			memcpy(outfile + outsize - suffixes[0].ziplen - 1,
1352 			    suffixes[0].zipped, suffixes[0].ziplen + 1);
1353 
1354 #ifndef SMALL
1355 		if (check_outfile(outfile) == 0) {
1356 			close(in);
1357 			return (-1);
1358 		}
1359 #endif
1360 	}
1361 
1362 	if (cflag == 0) {
1363 		out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
1364 		if (out == -1) {
1365 			maybe_warn("could not create output: %s", outfile);
1366 			fclose(stdin);
1367 			return (-1);
1368 		}
1369 #ifndef SMALL
1370 		remove_file = outfile;
1371 #endif
1372 	} else
1373 		out = STDOUT_FILENO;
1374 
1375 	in_size = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
1376 
1377 	(void)close(in);
1378 
1379 	/*
1380 	 * If there was an error, in_size will be -1.
1381 	 * If we compressed to stdout, just return the size.
1382 	 * Otherwise stat the file and check it is the correct size.
1383 	 * We only blow away the file if we can stat the output and it
1384 	 * has the expected size.
1385 	 */
1386 	if (cflag != 0)
1387 		return in_size == -1 ? -1 : size;
1388 
1389 #ifndef SMALL
1390 	if (fstat(out, &osb) != 0) {
1391 		maybe_warn("couldn't stat: %s", outfile);
1392 		goto bad_outfile;
1393 	}
1394 
1395 	if (osb.st_size != size) {
1396 		maybe_warnx("output file: %s wrong size (%ju != %ju), deleting",
1397 		    outfile, (uintmax_t)osb.st_size, (uintmax_t)size);
1398 		goto bad_outfile;
1399 	}
1400 
1401 	copymodes(out, &isb, outfile);
1402 	remove_file = NULL;
1403 #endif
1404 	if (close(out) == -1)
1405 		maybe_warn("couldn't close output");
1406 
1407 	/* output is good, ok to delete input */
1408 	unlink_input(file, &isb);
1409 	return (size);
1410 
1411 #ifndef SMALL
1412     bad_outfile:
1413 	if (close(out) == -1)
1414 		maybe_warn("couldn't close output");
1415 
1416 	maybe_warnx("leaving original %s", file);
1417 	unlink(outfile);
1418 	return (size);
1419 #endif
1420 }
1421 
1422 /* uncompress the given file and remove the original */
1423 static off_t
1424 file_uncompress(char *file, char *outfile, size_t outsize)
1425 {
1426 	struct stat isb, osb;
1427 	off_t size;
1428 	ssize_t rbytes;
1429 	unsigned char header1[4];
1430 	enum filetype method;
1431 	int fd, ofd, zfd = -1;
1432 	size_t in_size;
1433 #ifndef SMALL
1434 	ssize_t rv;
1435 	time_t timestamp = 0;
1436 	char name[PATH_MAX + 1];
1437 #endif
1438 
1439 	/* gather the old name info */
1440 
1441 	fd = open(file, O_RDONLY);
1442 	if (fd < 0) {
1443 		maybe_warn("can't open %s", file);
1444 		goto lose;
1445 	}
1446 	if (fstat(fd, &isb) != 0) {
1447 		close(fd);
1448 		maybe_warn("can't stat %s", file);
1449 		goto lose;
1450 	}
1451 	if (S_ISREG(isb.st_mode))
1452 		in_size = isb.st_size;
1453 	else
1454 		in_size = 0;
1455 	infile_set(file, in_size);
1456 
1457 	strlcpy(outfile, file, outsize);
1458 	if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
1459 		maybe_warnx("%s: unknown suffix -- ignored", file);
1460 		goto lose;
1461 	}
1462 
1463 	rbytes = read(fd, header1, sizeof header1);
1464 	if (rbytes != sizeof header1) {
1465 		/* we don't want to fail here. */
1466 #ifndef SMALL
1467 		if (fflag)
1468 			goto lose;
1469 #endif
1470 		if (rbytes == -1)
1471 			maybe_warn("can't read %s", file);
1472 		else
1473 			goto unexpected_EOF;
1474 		goto lose;
1475 	}
1476 	infile_newdata(rbytes);
1477 
1478 	method = file_gettype(header1);
1479 #ifndef SMALL
1480 	if (fflag == 0 && method == FT_UNKNOWN) {
1481 		maybe_warnx("%s: not in gzip format", file);
1482 		goto lose;
1483 	}
1484 
1485 #endif
1486 
1487 #ifndef SMALL
1488 	if (method == FT_GZIP && Nflag) {
1489 		unsigned char ts[4];	/* timestamp */
1490 
1491 		rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP);
1492 		if (rv >= 0 && rv < (ssize_t)(sizeof ts))
1493 			goto unexpected_EOF;
1494 		if (rv == -1) {
1495 			if (!fflag)
1496 				maybe_warn("can't read %s", file);
1497 			goto lose;
1498 		}
1499 		infile_newdata(rv);
1500 		timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0];
1501 
1502 		if (header1[3] & ORIG_NAME) {
1503 			rbytes = pread(fd, name, sizeof(name) - 1, GZIP_ORIGNAME);
1504 			if (rbytes < 0) {
1505 				maybe_warn("can't read %s", file);
1506 				goto lose;
1507 			}
1508 			if (name[0] != '\0') {
1509 				char *dp, *nf;
1510 
1511 				/* Make sure that name is NUL-terminated */
1512 				name[rbytes] = '\0';
1513 
1514 				/* strip saved directory name */
1515 				nf = strrchr(name, '/');
1516 				if (nf == NULL)
1517 					nf = name;
1518 				else
1519 					nf++;
1520 
1521 				/* preserve original directory name */
1522 				dp = strrchr(file, '/');
1523 				if (dp == NULL)
1524 					dp = file;
1525 				else
1526 					dp++;
1527 				snprintf(outfile, outsize, "%.*s%.*s",
1528 						(int) (dp - file),
1529 						file, (int) rbytes, nf);
1530 			}
1531 		}
1532 	}
1533 #endif
1534 	lseek(fd, 0, SEEK_SET);
1535 
1536 	if (cflag == 0 || lflag) {
1537 #ifndef SMALL
1538 		if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
1539 			maybe_warnx("%s has %ju other links -- skipping",
1540 			    file, (uintmax_t)isb.st_nlink - 1);
1541 			goto lose;
1542 		}
1543 		if (nflag == 0 && timestamp)
1544 			isb.st_mtime = timestamp;
1545 		if (check_outfile(outfile) == 0)
1546 			goto lose;
1547 #endif
1548 	}
1549 
1550 	if (cflag)
1551 		zfd = STDOUT_FILENO;
1552 	else if (lflag)
1553 		zfd = -1;
1554 	else {
1555 		zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
1556 		if (zfd == STDOUT_FILENO) {
1557 			/* We won't close STDOUT_FILENO later... */
1558 			zfd = dup(zfd);
1559 			close(STDOUT_FILENO);
1560 		}
1561 		if (zfd == -1) {
1562 			maybe_warn("can't open %s", outfile);
1563 			goto lose;
1564 		}
1565 		remove_file = outfile;
1566 	}
1567 
1568 	switch (method) {
1569 #ifndef NO_BZIP2_SUPPORT
1570 	case FT_BZIP2:
1571 		/* XXX */
1572 		if (lflag) {
1573 			maybe_warnx("no -l with bzip2 files");
1574 			goto lose;
1575 		}
1576 
1577 		size = unbzip2(fd, zfd, NULL, 0, NULL);
1578 		break;
1579 #endif
1580 
1581 #ifndef NO_COMPRESS_SUPPORT
1582 	case FT_Z: {
1583 		FILE *in, *out;
1584 
1585 		/* XXX */
1586 		if (lflag) {
1587 			maybe_warnx("no -l with Lempel-Ziv files");
1588 			goto lose;
1589 		}
1590 
1591 		if ((in = zdopen(fd)) == NULL) {
1592 			maybe_warn("zdopen for read: %s", file);
1593 			goto lose;
1594 		}
1595 
1596 		out = fdopen(dup(zfd), "w");
1597 		if (out == NULL) {
1598 			maybe_warn("fdopen for write: %s", outfile);
1599 			fclose(in);
1600 			goto lose;
1601 		}
1602 
1603 		size = zuncompress(in, out, NULL, 0, NULL);
1604 		/* need to fclose() if ferror() is true... */
1605 		if (ferror(in) | fclose(in)) {
1606 			maybe_warn("failed infile fclose");
1607 			unlink(outfile);
1608 			(void)fclose(out);
1609 		}
1610 		if (fclose(out) != 0) {
1611 			maybe_warn("failed outfile fclose");
1612 			unlink(outfile);
1613 			goto lose;
1614 		}
1615 		break;
1616 	}
1617 #endif
1618 
1619 #ifndef NO_PACK_SUPPORT
1620 	case FT_PACK:
1621 		if (lflag) {
1622 			maybe_warnx("no -l with packed files");
1623 			goto lose;
1624 		}
1625 
1626 		size = unpack(fd, zfd, NULL, 0, NULL);
1627 		break;
1628 #endif
1629 
1630 #ifndef NO_XZ_SUPPORT
1631 	case FT_XZ:
1632 		if (lflag) {
1633 			maybe_warnx("no -l with xz files");
1634 			goto lose;
1635 		}
1636 
1637 		size = unxz(fd, zfd, NULL, 0, NULL);
1638 		break;
1639 #endif
1640 
1641 #ifndef SMALL
1642 	case FT_UNKNOWN:
1643 		if (lflag) {
1644 			maybe_warnx("no -l for unknown filetypes");
1645 			goto lose;
1646 		}
1647 		size = cat_fd(NULL, 0, NULL, fd);
1648 		break;
1649 #endif
1650 	default:
1651 		if (lflag) {
1652 			print_list(fd, in_size, outfile, isb.st_mtime);
1653 			close(fd);
1654 			return -1;	/* XXX */
1655 		}
1656 
1657 		size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
1658 		break;
1659 	}
1660 
1661 	if (close(fd) != 0)
1662 		maybe_warn("couldn't close input");
1663 	if (zfd != STDOUT_FILENO && close(zfd) != 0)
1664 		maybe_warn("couldn't close output");
1665 
1666 	if (size == -1) {
1667 		if (cflag == 0)
1668 			unlink(outfile);
1669 		maybe_warnx("%s: uncompress failed", file);
1670 		return -1;
1671 	}
1672 
1673 	/* if testing, or we uncompressed to stdout, this is all we need */
1674 #ifndef SMALL
1675 	if (tflag)
1676 		return size;
1677 #endif
1678 	/* if we are uncompressing to stdin, don't remove the file. */
1679 	if (cflag)
1680 		return size;
1681 
1682 	/*
1683 	 * if we create a file...
1684 	 */
1685 	/*
1686 	 * if we can't stat the file don't remove the file.
1687 	 */
1688 
1689 	ofd = open(outfile, O_RDWR, 0);
1690 	if (ofd == -1) {
1691 		maybe_warn("couldn't open (leaving original): %s",
1692 			   outfile);
1693 		return -1;
1694 	}
1695 	if (fstat(ofd, &osb) != 0) {
1696 		maybe_warn("couldn't stat (leaving original): %s",
1697 			   outfile);
1698 		close(ofd);
1699 		return -1;
1700 	}
1701 	if (osb.st_size != size) {
1702 		maybe_warnx("stat gave different size: %ju != %ju (leaving original)",
1703 		    (uintmax_t)size, (uintmax_t)osb.st_size);
1704 		close(ofd);
1705 		unlink(outfile);
1706 		return -1;
1707 	}
1708 #ifndef SMALL
1709 	copymodes(ofd, &isb, outfile);
1710 	remove_file = NULL;
1711 #endif
1712 	close(ofd);
1713 	unlink_input(file, &isb);
1714 	return size;
1715 
1716     unexpected_EOF:
1717 	maybe_warnx("%s: unexpected end of file", file);
1718     lose:
1719 	if (fd != -1)
1720 		close(fd);
1721 	if (zfd != -1 && zfd != STDOUT_FILENO)
1722 		close(fd);
1723 	return -1;
1724 }
1725 
1726 #ifndef SMALL
1727 static void
1728 check_siginfo(void)
1729 {
1730 	if (print_info == 0)
1731 		return;
1732 	if (infile) {
1733 		if (infile_total) {
1734 			int pcent = (int)((100.0 * infile_current) / infile_total);
1735 
1736 			fprintf(stderr, "%s: done %llu/%llu bytes %d%%\n",
1737 				infile, (unsigned long long)infile_current,
1738 				(unsigned long long)infile_total, pcent);
1739 		} else
1740 			fprintf(stderr, "%s: done %llu bytes\n",
1741 				infile, (unsigned long long)infile_current);
1742 	}
1743 	print_info = 0;
1744 }
1745 
1746 static off_t
1747 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd)
1748 {
1749 	char buf[BUFLEN];
1750 	off_t in_tot;
1751 	ssize_t w;
1752 
1753 	in_tot = count;
1754 	w = write_retry(STDOUT_FILENO, prepend, count);
1755 	if (w == -1 || (size_t)w != count) {
1756 		maybe_warn("write to stdout");
1757 		return -1;
1758 	}
1759 	for (;;) {
1760 		ssize_t rv;
1761 
1762 		rv = read(fd, buf, sizeof buf);
1763 		if (rv == 0)
1764 			break;
1765 		if (rv < 0) {
1766 			maybe_warn("read from fd %d", fd);
1767 			break;
1768 		}
1769 		infile_newdata(rv);
1770 
1771 		if (write_retry(STDOUT_FILENO, buf, rv) != rv) {
1772 			maybe_warn("write to stdout");
1773 			break;
1774 		}
1775 		in_tot += rv;
1776 	}
1777 
1778 	if (gsizep)
1779 		*gsizep = in_tot;
1780 	return (in_tot);
1781 }
1782 #endif
1783 
1784 static void
1785 handle_stdin(void)
1786 {
1787 	struct stat isb;
1788 	unsigned char header1[4];
1789 	size_t in_size;
1790 	off_t usize, gsize;
1791 	enum filetype method;
1792 	ssize_t bytes_read;
1793 #ifndef NO_COMPRESS_SUPPORT
1794 	FILE *in;
1795 #endif
1796 
1797 #ifndef SMALL
1798 	if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
1799 		maybe_warnx("standard input is a terminal -- ignoring");
1800 		goto out;
1801 	}
1802 #endif
1803 
1804 	if (fstat(STDIN_FILENO, &isb) < 0) {
1805 		maybe_warn("fstat");
1806 		goto out;
1807 	}
1808 	if (S_ISREG(isb.st_mode))
1809 		in_size = isb.st_size;
1810 	else
1811 		in_size = 0;
1812 	infile_set("(stdin)", in_size);
1813 
1814 	if (lflag) {
1815 		print_list(STDIN_FILENO, in_size, infile, isb.st_mtime);
1816 		goto out;
1817 	}
1818 
1819 	bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1);
1820 	if (bytes_read == -1) {
1821 		maybe_warn("can't read stdin");
1822 		goto out;
1823 	} else if (bytes_read != sizeof(header1)) {
1824 		maybe_warnx("(stdin): unexpected end of file");
1825 		goto out;
1826 	}
1827 
1828 	method = file_gettype(header1);
1829 	switch (method) {
1830 	default:
1831 #ifndef SMALL
1832 		if (fflag == 0) {
1833 			maybe_warnx("unknown compression format");
1834 			goto out;
1835 		}
1836 		usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO);
1837 		break;
1838 #endif
1839 	case FT_GZIP:
1840 		usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
1841 			      (char *)header1, sizeof header1, &gsize, "(stdin)");
1842 		break;
1843 #ifndef NO_BZIP2_SUPPORT
1844 	case FT_BZIP2:
1845 		usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
1846 				(char *)header1, sizeof header1, &gsize);
1847 		break;
1848 #endif
1849 #ifndef NO_COMPRESS_SUPPORT
1850 	case FT_Z:
1851 		if ((in = zdopen(STDIN_FILENO)) == NULL) {
1852 			maybe_warnx("zopen of stdin");
1853 			goto out;
1854 		}
1855 
1856 		usize = zuncompress(in, stdout, (char *)header1,
1857 		    sizeof header1, &gsize);
1858 		fclose(in);
1859 		break;
1860 #endif
1861 #ifndef NO_PACK_SUPPORT
1862 	case FT_PACK:
1863 		usize = unpack(STDIN_FILENO, STDOUT_FILENO,
1864 			       (char *)header1, sizeof header1, &gsize);
1865 		break;
1866 #endif
1867 #ifndef NO_XZ_SUPPORT
1868 	case FT_XZ:
1869 		usize = unxz(STDIN_FILENO, STDOUT_FILENO,
1870 			     (char *)header1, sizeof header1, &gsize);
1871 		break;
1872 #endif
1873 	}
1874 
1875 #ifndef SMALL
1876         if (vflag && !tflag && usize != -1 && gsize != -1)
1877 		print_verbage(NULL, NULL, usize, gsize);
1878 	if (vflag && tflag)
1879 		print_test("(stdin)", usize != -1);
1880 #else
1881 	(void)&usize;
1882 #endif
1883 
1884 out:
1885 	infile_clear();
1886 }
1887 
1888 static void
1889 handle_stdout(void)
1890 {
1891 	off_t gsize;
1892 #ifndef SMALL
1893 	off_t usize;
1894 	struct stat sb;
1895 	time_t systime;
1896 	uint32_t mtime;
1897 	int ret;
1898 
1899 	infile_set("(stdout)", 0);
1900 
1901 	if (fflag == 0 && isatty(STDOUT_FILENO)) {
1902 		maybe_warnx("standard output is a terminal -- ignoring");
1903 		return;
1904 	}
1905 
1906 	/* If stdin is a file use its mtime, otherwise use current time */
1907 	ret = fstat(STDIN_FILENO, &sb);
1908 	if (ret < 0) {
1909 		maybe_warn("Can't stat stdin");
1910 		return;
1911 	}
1912 
1913 	if (S_ISREG(sb.st_mode)) {
1914 		infile_set("(stdout)", sb.st_size);
1915 		mtime = (uint32_t)sb.st_mtime;
1916 	} else {
1917 		systime = time(NULL);
1918 		if (systime == -1) {
1919 			maybe_warn("time");
1920 			return;
1921 		}
1922 		mtime = (uint32_t)systime;
1923 	}
1924 
1925 	usize =
1926 #endif
1927 		gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime);
1928 #ifndef SMALL
1929         if (vflag && !tflag && usize != -1 && gsize != -1)
1930 		print_verbage(NULL, NULL, usize, gsize);
1931 #endif
1932 }
1933 
1934 /* do what is asked for, for the path name */
1935 static void
1936 handle_pathname(char *path)
1937 {
1938 	char *opath = path, *s = NULL;
1939 	ssize_t len;
1940 	int slen;
1941 	struct stat sb;
1942 
1943 	/* check for stdout/stdin */
1944 	if (path[0] == '-' && path[1] == '\0') {
1945 		if (dflag)
1946 			handle_stdin();
1947 		else
1948 			handle_stdout();
1949 		return;
1950 	}
1951 
1952 retry:
1953 	if (stat(path, &sb) != 0 || (fflag == 0 && cflag == 0 &&
1954 	    lstat(path, &sb) != 0)) {
1955 		/* lets try <path>.gz if we're decompressing */
1956 		if (dflag && s == NULL && errno == ENOENT) {
1957 			len = strlen(path);
1958 			slen = suffixes[0].ziplen;
1959 			s = malloc(len + slen + 1);
1960 			if (s == NULL)
1961 				maybe_err("malloc");
1962 			memcpy(s, path, len);
1963 			memcpy(s + len, suffixes[0].zipped, slen + 1);
1964 			path = s;
1965 			goto retry;
1966 		}
1967 		maybe_warn("can't stat: %s", opath);
1968 		goto out;
1969 	}
1970 
1971 	if (S_ISDIR(sb.st_mode)) {
1972 #ifndef SMALL
1973 		if (rflag)
1974 			handle_dir(path);
1975 		else
1976 #endif
1977 			maybe_warnx("%s is a directory", path);
1978 		goto out;
1979 	}
1980 
1981 	if (S_ISREG(sb.st_mode))
1982 		handle_file(path, &sb);
1983 	else
1984 		maybe_warnx("%s is not a regular file", path);
1985 
1986 out:
1987 	if (s)
1988 		free(s);
1989 }
1990 
1991 /* compress/decompress a file */
1992 static void
1993 handle_file(char *file, struct stat *sbp)
1994 {
1995 	off_t usize, gsize;
1996 	char	outfile[PATH_MAX];
1997 
1998 	infile_set(file, sbp->st_size);
1999 	if (dflag) {
2000 		usize = file_uncompress(file, outfile, sizeof(outfile));
2001 #ifndef SMALL
2002 		if (vflag && tflag)
2003 			print_test(file, usize != -1);
2004 #endif
2005 		if (usize == -1)
2006 			return;
2007 		gsize = sbp->st_size;
2008 	} else {
2009 		gsize = file_compress(file, outfile, sizeof(outfile));
2010 		if (gsize == -1)
2011 			return;
2012 		usize = sbp->st_size;
2013 	}
2014 	infile_clear();
2015 
2016 #ifndef SMALL
2017 	if (vflag && !tflag)
2018 		print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
2019 #endif
2020 }
2021 
2022 #ifndef SMALL
2023 /* this is used with -r to recursively descend directories */
2024 static void
2025 handle_dir(char *dir)
2026 {
2027 	char *path_argv[2];
2028 	FTS *fts;
2029 	FTSENT *entry;
2030 
2031 	path_argv[0] = dir;
2032 	path_argv[1] = 0;
2033 	fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
2034 	if (fts == NULL) {
2035 		warn("couldn't fts_open %s", dir);
2036 		return;
2037 	}
2038 
2039 	while ((entry = fts_read(fts))) {
2040 		switch(entry->fts_info) {
2041 		case FTS_D:
2042 		case FTS_DP:
2043 			continue;
2044 
2045 		case FTS_DNR:
2046 		case FTS_ERR:
2047 		case FTS_NS:
2048 			maybe_warn("%s", entry->fts_path);
2049 			continue;
2050 		case FTS_F:
2051 			handle_file(entry->fts_path, entry->fts_statp);
2052 		}
2053 	}
2054 	(void)fts_close(fts);
2055 }
2056 #endif
2057 
2058 /* print a ratio - size reduction as a fraction of uncompressed size */
2059 static void
2060 print_ratio(off_t in, off_t out, FILE *where)
2061 {
2062 	int percent10;	/* 10 * percent */
2063 	off_t diff;
2064 	char buff[8];
2065 	int len;
2066 
2067 	diff = in - out/2;
2068 	if (in == 0 && out == 0)
2069 		percent10 = 0;
2070 	else if (diff < 0)
2071 		/*
2072 		 * Output is more than double size of input! print -99.9%
2073 		 * Quite possibly we've failed to get the original size.
2074 		 */
2075 		percent10 = -999;
2076 	else {
2077 		/*
2078 		 * We only need 12 bits of result from the final division,
2079 		 * so reduce the values until a 32bit division will suffice.
2080 		 */
2081 		while (in > 0x100000) {
2082 			diff >>= 1;
2083 			in >>= 1;
2084 		}
2085 		if (in != 0)
2086 			percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
2087 		else
2088 			percent10 = 0;
2089 	}
2090 
2091 	len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
2092 	/* Move the '.' to before the last digit */
2093 	buff[len - 1] = buff[len - 2];
2094 	buff[len - 2] = '.';
2095 	fprintf(where, "%5s%%", buff);
2096 }
2097 
2098 #ifndef SMALL
2099 /* print compression statistics, and the new name (if there is one!) */
2100 static void
2101 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
2102 {
2103 	if (file)
2104 		fprintf(stderr, "%s:%s  ", file,
2105 		    strlen(file) < 7 ? "\t\t" : "\t");
2106 	print_ratio(usize, gsize, stderr);
2107 	if (nfile)
2108 		fprintf(stderr, " -- replaced with %s", nfile);
2109 	fprintf(stderr, "\n");
2110 	fflush(stderr);
2111 }
2112 
2113 /* print test results */
2114 static void
2115 print_test(const char *file, int ok)
2116 {
2117 
2118 	if (exit_value == 0 && ok == 0)
2119 		exit_value = 1;
2120 	fprintf(stderr, "%s:%s  %s\n", file,
2121 	    strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
2122 	fflush(stderr);
2123 }
2124 #endif
2125 
2126 /* print a file's info ala --list */
2127 /* eg:
2128   compressed uncompressed  ratio uncompressed_name
2129       354841      1679360  78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
2130 */
2131 static void
2132 print_list(int fd, off_t out, const char *outfile, time_t ts)
2133 {
2134 	static int first = 1;
2135 #ifndef SMALL
2136 	static off_t in_tot, out_tot;
2137 	uint32_t crc = 0;
2138 #endif
2139 	off_t in = 0, rv;
2140 
2141 	if (first) {
2142 #ifndef SMALL
2143 		if (vflag)
2144 			printf("method  crc     date  time  ");
2145 #endif
2146 		if (qflag == 0)
2147 			printf("  compressed uncompressed  "
2148 			       "ratio uncompressed_name\n");
2149 	}
2150 	first = 0;
2151 
2152 	/* print totals? */
2153 #ifndef SMALL
2154 	if (fd == -1) {
2155 		in = in_tot;
2156 		out = out_tot;
2157 	} else
2158 #endif
2159 	{
2160 		/* read the last 4 bytes - this is the uncompressed size */
2161 		rv = lseek(fd, (off_t)(-8), SEEK_END);
2162 		if (rv != -1) {
2163 			unsigned char buf[8];
2164 			uint32_t usize;
2165 
2166 			rv = read(fd, (char *)buf, sizeof(buf));
2167 			if (rv == -1)
2168 				maybe_warn("read of uncompressed size");
2169 			else if (rv != sizeof(buf))
2170 				maybe_warnx("read of uncompressed size");
2171 
2172 			else {
2173 				usize = buf[4] | buf[5] << 8 |
2174 					buf[6] << 16 | buf[7] << 24;
2175 				in = (off_t)usize;
2176 #ifndef SMALL
2177 				crc = buf[0] | buf[1] << 8 |
2178 				      buf[2] << 16 | buf[3] << 24;
2179 #endif
2180 			}
2181 		}
2182 	}
2183 
2184 #ifndef SMALL
2185 	if (vflag && fd == -1)
2186 		printf("                            ");
2187 	else if (vflag) {
2188 		char *date = ctime(&ts);
2189 
2190 		/* skip the day, 1/100th second, and year */
2191 		date += 4;
2192 		date[12] = 0;
2193 		printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
2194 	}
2195 	in_tot += in;
2196 	out_tot += out;
2197 #else
2198 	(void)&ts;	/* XXX */
2199 #endif
2200 	printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
2201 	print_ratio(in, out, stdout);
2202 	printf(" %s\n", outfile);
2203 }
2204 
2205 /* display the usage of NetBSD gzip */
2206 static void
2207 usage(void)
2208 {
2209 
2210 	fprintf(stderr, "%s\n", gzip_version);
2211 	fprintf(stderr,
2212 #ifdef SMALL
2213     "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n",
2214 #else
2215     "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n"
2216     " -1 --fast            fastest (worst) compression\n"
2217     " -2 .. -8             set compression level\n"
2218     " -9 --best            best (slowest) compression\n"
2219     " -c --stdout          write to stdout, keep original files\n"
2220     "    --to-stdout\n"
2221     " -d --decompress      uncompress files\n"
2222     "    --uncompress\n"
2223     " -f --force           force overwriting & compress links\n"
2224     " -h --help            display this help\n"
2225     " -k --keep            don't delete input files during operation\n"
2226     " -l --list            list compressed file contents\n"
2227     " -N --name            save or restore original file name and time stamp\n"
2228     " -n --no-name         don't save original file name or time stamp\n"
2229     " -q --quiet           output no warnings\n"
2230     " -r --recursive       recursively compress files in directories\n"
2231     " -S .suf              use suffix .suf instead of .gz\n"
2232     "    --suffix .suf\n"
2233     " -t --test            test compressed file\n"
2234     " -V --version         display program version\n"
2235     " -v --verbose         print extra statistics\n",
2236 #endif
2237 	    getprogname());
2238 	exit(0);
2239 }
2240 
2241 #ifndef SMALL
2242 /* display the license information of FreeBSD gzip */
2243 static void
2244 display_license(void)
2245 {
2246 
2247 	fprintf(stderr, "%s (based on NetBSD gzip 20150113)\n", gzip_version);
2248 	fprintf(stderr, "%s\n", gzip_copyright);
2249 	exit(0);
2250 }
2251 #endif
2252 
2253 /* display the version of NetBSD gzip */
2254 static void
2255 display_version(void)
2256 {
2257 
2258 	fprintf(stderr, "%s\n", gzip_version);
2259 	exit(0);
2260 }
2261 
2262 #ifndef NO_BZIP2_SUPPORT
2263 #include "unbzip2.c"
2264 #endif
2265 #ifndef NO_COMPRESS_SUPPORT
2266 #include "zuncompress.c"
2267 #endif
2268 #ifndef NO_PACK_SUPPORT
2269 #include "unpack.c"
2270 #endif
2271 #ifndef NO_XZ_SUPPORT
2272 #include "unxz.c"
2273 #endif
2274 
2275 static ssize_t
2276 read_retry(int fd, void *buf, size_t sz)
2277 {
2278 	char *cp = buf;
2279 	size_t left = MIN(sz, (size_t) SSIZE_MAX);
2280 
2281 	while (left > 0) {
2282 		ssize_t ret;
2283 
2284 		ret = read(fd, cp, left);
2285 		if (ret == -1) {
2286 			return ret;
2287 		} else if (ret == 0) {
2288 			break; /* EOF */
2289 		}
2290 		cp += ret;
2291 		left -= ret;
2292 	}
2293 
2294 	return sz - left;
2295 }
2296 
2297 static ssize_t
2298 write_retry(int fd, const void *buf, size_t sz)
2299 {
2300 	const char *cp = buf;
2301 	size_t left = MIN(sz, (size_t) SSIZE_MAX);
2302 
2303 	while (left > 0) {
2304 		ssize_t ret;
2305 
2306 		ret = write(fd, cp, left);
2307 		if (ret == -1) {
2308 			return ret;
2309 		} else if (ret == 0) {
2310 			abort();	/* Can't happen */
2311 		}
2312 		cp += ret;
2313 		left -= ret;
2314 	}
2315 
2316 	return sz - left;
2317 }
2318