xref: /freebsd/usr.bin/gzip/gzip.c (revision cdadbf097128130443a6dc84e756ffcbe925d3d9)
1 /*	$NetBSD: gzip.c,v 1.112 2017/08/23 13:04:17 christos Exp $	*/
2 
3 /*-
4  * Copyright (c) 1997, 1998, 2003, 2004, 2006, 2008, 2009, 2010, 2011, 2015, 2017
5  *    Matthew R. Green
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
22  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
24  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  */
30 
31 #include <sys/cdefs.h>
32 #ifndef lint
33 __COPYRIGHT("@(#) Copyright (c) 1997, 1998, 2003, 2004, 2006, 2008,\
34  2009, 2010, 2011, 2015, 2017 Matthew R. Green.  All rights reserved.");
35 __FBSDID("$FreeBSD$");
36 #endif /* not lint */
37 
38 /*
39  * gzip.c -- GPL free gzip using zlib.
40  *
41  * RFC 1950 covers the zlib format
42  * RFC 1951 covers the deflate format
43  * RFC 1952 covers the gzip format
44  *
45  * TODO:
46  *	- use mmap where possible
47  *	- make bzip2/compress -v/-t/-l support work as well as possible
48  */
49 
50 #include <sys/param.h>
51 #include <sys/stat.h>
52 #include <sys/time.h>
53 
54 #include <inttypes.h>
55 #include <unistd.h>
56 #include <stdio.h>
57 #include <string.h>
58 #include <stdlib.h>
59 #include <err.h>
60 #include <errno.h>
61 #include <fcntl.h>
62 #include <zlib.h>
63 #include <fts.h>
64 #include <libgen.h>
65 #include <stdarg.h>
66 #include <getopt.h>
67 #include <time.h>
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 #ifndef NO_XZ_SUPPORT
82 	FT_XZ,
83 #endif
84 	FT_LAST,
85 	FT_UNKNOWN
86 };
87 
88 #ifndef NO_BZIP2_SUPPORT
89 #include <bzlib.h>
90 
91 #define BZ2_SUFFIX	".bz2"
92 #define BZIP2_MAGIC	"BZh"
93 #endif
94 
95 #ifndef NO_COMPRESS_SUPPORT
96 #define Z_SUFFIX	".Z"
97 #define Z_MAGIC		"\037\235"
98 #endif
99 
100 #ifndef NO_PACK_SUPPORT
101 #define PACK_MAGIC	"\037\036"
102 #endif
103 
104 #ifndef NO_XZ_SUPPORT
105 #include <lzma.h>
106 #define XZ_SUFFIX	".xz"
107 #define XZ_MAGIC	"\3757zXZ"
108 #endif
109 
110 #define GZ_SUFFIX	".gz"
111 
112 #define BUFLEN		(64 * 1024)
113 
114 #define GZIP_MAGIC0	0x1F
115 #define GZIP_MAGIC1	0x8B
116 #define GZIP_OMAGIC1	0x9E
117 
118 #define GZIP_TIMESTAMP	(off_t)4
119 #define GZIP_ORIGNAME	(off_t)10
120 
121 #define HEAD_CRC	0x02
122 #define EXTRA_FIELD	0x04
123 #define ORIG_NAME	0x08
124 #define COMMENT		0x10
125 
126 #define OS_CODE		3	/* Unix */
127 
128 typedef struct {
129     const char	*zipped;
130     int		ziplen;
131     const char	*normal;	/* for unzip - must not be longer than zipped */
132 } suffixes_t;
133 static suffixes_t suffixes[] = {
134 #define	SUFFIX(Z, N) {Z, sizeof Z - 1, N}
135 	SUFFIX(GZ_SUFFIX,	""),	/* Overwritten by -S .xxx */
136 #ifndef SMALL
137 	SUFFIX(GZ_SUFFIX,	""),
138 	SUFFIX(".z",		""),
139 	SUFFIX("-gz",		""),
140 	SUFFIX("-z",		""),
141 	SUFFIX("_z",		""),
142 	SUFFIX(".taz",		".tar"),
143 	SUFFIX(".tgz",		".tar"),
144 #ifndef NO_BZIP2_SUPPORT
145 	SUFFIX(BZ2_SUFFIX,	""),
146 	SUFFIX(".tbz",		".tar"),
147 	SUFFIX(".tbz2",		".tar"),
148 #endif
149 #ifndef NO_COMPRESS_SUPPORT
150 	SUFFIX(Z_SUFFIX,	""),
151 #endif
152 #ifndef NO_XZ_SUPPORT
153 	SUFFIX(XZ_SUFFIX,	""),
154 #endif
155 	SUFFIX(GZ_SUFFIX,	""),	/* Overwritten by -S "" */
156 #endif /* SMALL */
157 #undef SUFFIX
158 };
159 #define NUM_SUFFIXES (nitems(suffixes))
160 #define SUFFIX_MAXLEN	30
161 
162 static	const char	gzip_version[] = "FreeBSD gzip 20171121";
163 
164 #ifndef SMALL
165 static	const char	gzip_copyright[] = \
166 "   Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green\n"
167 "   All rights reserved.\n"
168 "\n"
169 "   Redistribution and use in source and binary forms, with or without\n"
170 "   modification, are permitted provided that the following conditions\n"
171 "   are met:\n"
172 "   1. Redistributions of source code must retain the above copyright\n"
173 "      notice, this list of conditions and the following disclaimer.\n"
174 "   2. Redistributions in binary form must reproduce the above copyright\n"
175 "      notice, this list of conditions and the following disclaimer in the\n"
176 "      documentation and/or other materials provided with the distribution.\n"
177 "\n"
178 "   THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n"
179 "   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n"
180 "   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n"
181 "   IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n"
182 "   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,\n"
183 "   BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n"
184 "   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED\n"
185 "   AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,\n"
186 "   OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\n"
187 "   OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\n"
188 "   SUCH DAMAGE.";
189 #endif
190 
191 static	int	cflag;			/* stdout mode */
192 static	int	dflag;			/* decompress mode */
193 static	int	lflag;			/* list mode */
194 static	int	numflag = 6;		/* gzip -1..-9 value */
195 
196 static	const char *remove_file = NULL;	/* file to be removed upon SIGINT */
197 
198 static	int	fflag;			/* force mode */
199 #ifndef SMALL
200 static	int	kflag;			/* don't delete input files */
201 static	int	nflag;			/* don't save name/timestamp */
202 static	int	Nflag;			/* don't restore name/timestamp */
203 static	int	qflag;			/* quiet mode */
204 static	int	rflag;			/* recursive mode */
205 static	int	tflag;			/* test */
206 static	int	vflag;			/* verbose mode */
207 static	sig_atomic_t print_info = 0;
208 #else
209 #define		qflag	0
210 #define		tflag	0
211 #endif
212 
213 static	int	exit_value = 0;		/* exit value */
214 
215 static	const char *infile;		/* name of file coming in */
216 
217 static	void	maybe_err(const char *fmt, ...) __printflike(1, 2) __dead2;
218 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) ||	\
219     !defined(NO_XZ_SUPPORT)
220 static	void	maybe_errx(const char *fmt, ...) __printflike(1, 2) __dead2;
221 #endif
222 static	void	maybe_warn(const char *fmt, ...) __printflike(1, 2);
223 static	void	maybe_warnx(const char *fmt, ...) __printflike(1, 2);
224 static	enum filetype file_gettype(u_char *);
225 #ifdef SMALL
226 #define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz)
227 #endif
228 static	off_t	gz_compress(int, int, off_t *, const char *, uint32_t);
229 static	off_t	gz_uncompress(int, int, char *, size_t, off_t *, const char *);
230 static	off_t	file_compress(char *, char *, size_t);
231 static	off_t	file_uncompress(char *, char *, size_t);
232 static	void	handle_pathname(char *);
233 static	void	handle_file(char *, struct stat *);
234 static	void	handle_stdin(void);
235 static	void	handle_stdout(void);
236 static	void	print_ratio(off_t, off_t, FILE *);
237 static	void	print_list(int fd, off_t, const char *, time_t);
238 static	void	usage(void) __dead2;
239 static	void	display_version(void) __dead2;
240 #ifndef SMALL
241 static	void	display_license(void);
242 #endif
243 static	const suffixes_t *check_suffix(char *, int);
244 static	ssize_t	read_retry(int, void *, size_t);
245 static	ssize_t	write_retry(int, const void *, size_t);
246 
247 #ifdef SMALL
248 #define infile_set(f,t) infile_set(f)
249 #endif
250 static	void	infile_set(const char *newinfile, off_t total);
251 
252 #ifdef SMALL
253 #define unlink_input(f, sb) unlink(f)
254 #define check_siginfo() /* nothing */
255 #define setup_signals() /* nothing */
256 #define infile_newdata(t) /* nothing */
257 #else
258 static	off_t	infile_total;		/* total expected to read/write */
259 static	off_t	infile_current;		/* current read/write */
260 
261 static	void	check_siginfo(void);
262 static	off_t	cat_fd(unsigned char *, size_t, off_t *, int fd);
263 static	void	prepend_gzip(char *, int *, char ***);
264 static	void	handle_dir(char *);
265 static	void	print_verbage(const char *, const char *, off_t, off_t);
266 static	void	print_test(const char *, int);
267 static	void	copymodes(int fd, const struct stat *, const char *file);
268 static	int	check_outfile(const char *outfile);
269 static	void	setup_signals(void);
270 static	void	infile_newdata(size_t newdata);
271 static	void	infile_clear(void);
272 #endif
273 
274 #ifndef NO_BZIP2_SUPPORT
275 static	off_t	unbzip2(int, int, char *, size_t, off_t *);
276 #endif
277 
278 #ifndef NO_COMPRESS_SUPPORT
279 static	FILE 	*zdopen(int);
280 static	off_t	zuncompress(FILE *, FILE *, char *, size_t, off_t *);
281 #endif
282 
283 #ifndef NO_PACK_SUPPORT
284 static	off_t	unpack(int, int, char *, size_t, off_t *);
285 #endif
286 
287 #ifndef NO_XZ_SUPPORT
288 static	off_t	unxz(int, int, char *, size_t, off_t *);
289 #endif
290 
291 #ifdef SMALL
292 #define getopt_long(a,b,c,d,e) getopt(a,b,c)
293 #else
294 static const struct option longopts[] = {
295 	{ "stdout",		no_argument,		0,	'c' },
296 	{ "to-stdout",		no_argument,		0,	'c' },
297 	{ "decompress",		no_argument,		0,	'd' },
298 	{ "uncompress",		no_argument,		0,	'd' },
299 	{ "force",		no_argument,		0,	'f' },
300 	{ "help",		no_argument,		0,	'h' },
301 	{ "keep",		no_argument,		0,	'k' },
302 	{ "list",		no_argument,		0,	'l' },
303 	{ "no-name",		no_argument,		0,	'n' },
304 	{ "name",		no_argument,		0,	'N' },
305 	{ "quiet",		no_argument,		0,	'q' },
306 	{ "recursive",		no_argument,		0,	'r' },
307 	{ "suffix",		required_argument,	0,	'S' },
308 	{ "test",		no_argument,		0,	't' },
309 	{ "verbose",		no_argument,		0,	'v' },
310 	{ "version",		no_argument,		0,	'V' },
311 	{ "fast",		no_argument,		0,	'1' },
312 	{ "best",		no_argument,		0,	'9' },
313 	{ "ascii",		no_argument,		0,	'a' },
314 	{ "license",		no_argument,		0,	'L' },
315 	{ NULL,			no_argument,		0,	0 },
316 };
317 #endif
318 
319 int
320 main(int argc, char **argv)
321 {
322 	const char *progname = getprogname();
323 #ifndef SMALL
324 	char *gzip;
325 	int len;
326 #endif
327 	int ch;
328 
329 	setup_signals();
330 
331 #ifndef SMALL
332 	if ((gzip = getenv("GZIP")) != NULL)
333 		prepend_gzip(gzip, &argc, &argv);
334 #endif
335 
336 	/*
337 	 * XXX
338 	 * handle being called `gunzip', `zcat' and `gzcat'
339 	 */
340 	if (strcmp(progname, "gunzip") == 0)
341 		dflag = 1;
342 	else if (strcmp(progname, "zcat") == 0 ||
343 		 strcmp(progname, "gzcat") == 0)
344 		dflag = cflag = 1;
345 
346 #ifdef SMALL
347 #define OPT_LIST "123456789cdhlV"
348 #else
349 #define OPT_LIST "123456789acdfhklLNnqrS:tVv"
350 #endif
351 
352 	while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) {
353 		switch (ch) {
354 		case '1': case '2': case '3':
355 		case '4': case '5': case '6':
356 		case '7': case '8': case '9':
357 			numflag = ch - '0';
358 			break;
359 		case 'c':
360 			cflag = 1;
361 			break;
362 		case 'd':
363 			dflag = 1;
364 			break;
365 		case 'l':
366 			lflag = 1;
367 			dflag = 1;
368 			break;
369 		case 'V':
370 			display_version();
371 			/* NOTREACHED */
372 #ifndef SMALL
373 		case 'a':
374 			fprintf(stderr, "%s: option --ascii ignored on this system\n", progname);
375 			break;
376 		case 'f':
377 			fflag = 1;
378 			break;
379 		case 'k':
380 			kflag = 1;
381 			break;
382 		case 'L':
383 			display_license();
384 			/* NOT REACHED */
385 		case 'N':
386 			nflag = 0;
387 			Nflag = 1;
388 			break;
389 		case 'n':
390 			nflag = 1;
391 			Nflag = 0;
392 			break;
393 		case 'q':
394 			qflag = 1;
395 			break;
396 		case 'r':
397 			rflag = 1;
398 			break;
399 		case 'S':
400 			len = strlen(optarg);
401 			if (len != 0) {
402 				if (len > SUFFIX_MAXLEN)
403 					errx(1, "incorrect suffix: '%s': too long", optarg);
404 				suffixes[0].zipped = optarg;
405 				suffixes[0].ziplen = len;
406 			} else {
407 				suffixes[NUM_SUFFIXES - 1].zipped = "";
408 				suffixes[NUM_SUFFIXES - 1].ziplen = 0;
409 			}
410 			break;
411 		case 't':
412 			cflag = 1;
413 			tflag = 1;
414 			dflag = 1;
415 			break;
416 		case 'v':
417 			vflag = 1;
418 			break;
419 #endif
420 		default:
421 			usage();
422 			/* NOTREACHED */
423 		}
424 	}
425 	argv += optind;
426 	argc -= optind;
427 
428 	if (argc == 0) {
429 		if (dflag)	/* stdin mode */
430 			handle_stdin();
431 		else		/* stdout mode */
432 			handle_stdout();
433 	} else {
434 		do {
435 			handle_pathname(argv[0]);
436 		} while (*++argv);
437 	}
438 #ifndef SMALL
439 	if (qflag == 0 && lflag && argc > 1)
440 		print_list(-1, 0, "(totals)", 0);
441 #endif
442 	exit(exit_value);
443 }
444 
445 /* maybe print a warning */
446 void
447 maybe_warn(const char *fmt, ...)
448 {
449 	va_list ap;
450 
451 	if (qflag == 0) {
452 		va_start(ap, fmt);
453 		vwarn(fmt, ap);
454 		va_end(ap);
455 	}
456 	if (exit_value == 0)
457 		exit_value = 1;
458 }
459 
460 /* ... without an errno. */
461 void
462 maybe_warnx(const char *fmt, ...)
463 {
464 	va_list ap;
465 
466 	if (qflag == 0) {
467 		va_start(ap, fmt);
468 		vwarnx(fmt, ap);
469 		va_end(ap);
470 	}
471 	if (exit_value == 0)
472 		exit_value = 1;
473 }
474 
475 /* maybe print an error */
476 void
477 maybe_err(const char *fmt, ...)
478 {
479 	va_list ap;
480 
481 	if (qflag == 0) {
482 		va_start(ap, fmt);
483 		vwarn(fmt, ap);
484 		va_end(ap);
485 	}
486 	exit(2);
487 }
488 
489 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) ||	\
490     !defined(NO_XZ_SUPPORT)
491 /* ... without an errno. */
492 void
493 maybe_errx(const char *fmt, ...)
494 {
495 	va_list ap;
496 
497 	if (qflag == 0) {
498 		va_start(ap, fmt);
499 		vwarnx(fmt, ap);
500 		va_end(ap);
501 	}
502 	exit(2);
503 }
504 #endif
505 
506 #ifndef SMALL
507 /* split up $GZIP and prepend it to the argument list */
508 static void
509 prepend_gzip(char *gzip, int *argc, char ***argv)
510 {
511 	char *s, **nargv, **ac;
512 	int nenvarg = 0, i;
513 
514 	/* scan how many arguments there are */
515 	for (s = gzip;;) {
516 		while (*s == ' ' || *s == '\t')
517 			s++;
518 		if (*s == 0)
519 			goto count_done;
520 		nenvarg++;
521 		while (*s != ' ' && *s != '\t')
522 			if (*s++ == 0)
523 				goto count_done;
524 	}
525 count_done:
526 	/* punt early */
527 	if (nenvarg == 0)
528 		return;
529 
530 	*argc += nenvarg;
531 	ac = *argv;
532 
533 	nargv = (char **)malloc((*argc + 1) * sizeof(char *));
534 	if (nargv == NULL)
535 		maybe_err("malloc");
536 
537 	/* stash this away */
538 	*argv = nargv;
539 
540 	/* copy the program name first */
541 	i = 0;
542 	nargv[i++] = *(ac++);
543 
544 	/* take a copy of $GZIP and add it to the array */
545 	s = strdup(gzip);
546 	if (s == NULL)
547 		maybe_err("strdup");
548 	for (;;) {
549 		/* Skip whitespaces. */
550 		while (*s == ' ' || *s == '\t')
551 			s++;
552 		if (*s == 0)
553 			goto copy_done;
554 		nargv[i++] = s;
555 		/* Find the end of this argument. */
556 		while (*s != ' ' && *s != '\t')
557 			if (*s++ == 0)
558 				/* Argument followed by NUL. */
559 				goto copy_done;
560 		/* Terminate by overwriting ' ' or '\t' with NUL. */
561 		*s++ = 0;
562 	}
563 copy_done:
564 
565 	/* copy the original arguments and a NULL */
566 	while (*ac)
567 		nargv[i++] = *(ac++);
568 	nargv[i] = NULL;
569 }
570 #endif
571 
572 /* compress input to output. Return bytes read, -1 on error */
573 static off_t
574 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime)
575 {
576 	z_stream z;
577 	char *outbufp, *inbufp;
578 	off_t in_tot = 0, out_tot = 0;
579 	ssize_t in_size;
580 	int i, error;
581 	uLong crc;
582 #ifdef SMALL
583 	static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0,
584 				 0, 0, 0, 0,
585 				 0, OS_CODE };
586 #endif
587 
588 	outbufp = malloc(BUFLEN);
589 	inbufp = malloc(BUFLEN);
590 	if (outbufp == NULL || inbufp == NULL) {
591 		maybe_err("malloc failed");
592 		goto out;
593 	}
594 
595 	memset(&z, 0, sizeof z);
596 	z.zalloc = Z_NULL;
597 	z.zfree = Z_NULL;
598 	z.opaque = 0;
599 
600 #ifdef SMALL
601 	memcpy(outbufp, header, sizeof header);
602 	i = sizeof header;
603 #else
604 	if (nflag != 0) {
605 		mtime = 0;
606 		origname = "";
607 	}
608 
609 	i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s",
610 		     GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED,
611 		     *origname ? ORIG_NAME : 0,
612 		     mtime & 0xff,
613 		     (mtime >> 8) & 0xff,
614 		     (mtime >> 16) & 0xff,
615 		     (mtime >> 24) & 0xff,
616 		     numflag == 1 ? 4 : numflag == 9 ? 2 : 0,
617 		     OS_CODE, origname);
618 	if (i >= BUFLEN)
619 		/* this need PATH_MAX > BUFLEN ... */
620 		maybe_err("snprintf");
621 	if (*origname)
622 		i++;
623 #endif
624 
625 	z.next_out = (unsigned char *)outbufp + i;
626 	z.avail_out = BUFLEN - i;
627 
628 	error = deflateInit2(&z, numflag, Z_DEFLATED,
629 			     (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY);
630 	if (error != Z_OK) {
631 		maybe_warnx("deflateInit2 failed");
632 		in_tot = -1;
633 		goto out;
634 	}
635 
636 	crc = crc32(0L, Z_NULL, 0);
637 	for (;;) {
638 		if (z.avail_out == 0) {
639 			if (write_retry(out, outbufp, BUFLEN) != BUFLEN) {
640 				maybe_warn("write");
641 				out_tot = -1;
642 				goto out;
643 			}
644 
645 			out_tot += BUFLEN;
646 			z.next_out = (unsigned char *)outbufp;
647 			z.avail_out = BUFLEN;
648 		}
649 
650 		if (z.avail_in == 0) {
651 			in_size = read(in, inbufp, BUFLEN);
652 			if (in_size < 0) {
653 				maybe_warn("read");
654 				in_tot = -1;
655 				goto out;
656 			}
657 			if (in_size == 0)
658 				break;
659 			infile_newdata(in_size);
660 
661 			crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size);
662 			in_tot += in_size;
663 			z.next_in = (unsigned char *)inbufp;
664 			z.avail_in = in_size;
665 		}
666 
667 		error = deflate(&z, Z_NO_FLUSH);
668 		if (error != Z_OK && error != Z_STREAM_END) {
669 			maybe_warnx("deflate failed");
670 			in_tot = -1;
671 			goto out;
672 		}
673 	}
674 
675 	/* clean up */
676 	for (;;) {
677 		size_t len;
678 		ssize_t w;
679 
680 		error = deflate(&z, Z_FINISH);
681 		if (error != Z_OK && error != Z_STREAM_END) {
682 			maybe_warnx("deflate failed");
683 			in_tot = -1;
684 			goto out;
685 		}
686 
687 		len = (char *)z.next_out - outbufp;
688 
689 		w = write_retry(out, outbufp, len);
690 		if (w == -1 || (size_t)w != len) {
691 			maybe_warn("write");
692 			out_tot = -1;
693 			goto out;
694 		}
695 		out_tot += len;
696 		z.next_out = (unsigned char *)outbufp;
697 		z.avail_out = BUFLEN;
698 
699 		if (error == Z_STREAM_END)
700 			break;
701 	}
702 
703 	if (deflateEnd(&z) != Z_OK) {
704 		maybe_warnx("deflateEnd failed");
705 		in_tot = -1;
706 		goto out;
707 	}
708 
709 	i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c",
710 		 (int)crc & 0xff,
711 		 (int)(crc >> 8) & 0xff,
712 		 (int)(crc >> 16) & 0xff,
713 		 (int)(crc >> 24) & 0xff,
714 		 (int)in_tot & 0xff,
715 		 (int)(in_tot >> 8) & 0xff,
716 		 (int)(in_tot >> 16) & 0xff,
717 		 (int)(in_tot >> 24) & 0xff);
718 	if (i != 8)
719 		maybe_err("snprintf");
720 	if (write_retry(out, outbufp, i) != i) {
721 		maybe_warn("write");
722 		in_tot = -1;
723 	} else
724 		out_tot += i;
725 
726 out:
727 	if (inbufp != NULL)
728 		free(inbufp);
729 	if (outbufp != NULL)
730 		free(outbufp);
731 	if (gsizep)
732 		*gsizep = out_tot;
733 	return in_tot;
734 }
735 
736 /*
737  * uncompress input to output then close the input.  return the
738  * uncompressed size written, and put the compressed sized read
739  * into `*gsizep'.
740  */
741 static off_t
742 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
743 	      const char *filename)
744 {
745 	z_stream z;
746 	char *outbufp, *inbufp;
747 	off_t out_tot = -1, in_tot = 0;
748 	uint32_t out_sub_tot = 0;
749 	enum {
750 		GZSTATE_MAGIC0,
751 		GZSTATE_MAGIC1,
752 		GZSTATE_METHOD,
753 		GZSTATE_FLAGS,
754 		GZSTATE_SKIPPING,
755 		GZSTATE_EXTRA,
756 		GZSTATE_EXTRA2,
757 		GZSTATE_EXTRA3,
758 		GZSTATE_ORIGNAME,
759 		GZSTATE_COMMENT,
760 		GZSTATE_HEAD_CRC1,
761 		GZSTATE_HEAD_CRC2,
762 		GZSTATE_INIT,
763 		GZSTATE_READ,
764 		GZSTATE_CRC,
765 		GZSTATE_LEN,
766 	} state = GZSTATE_MAGIC0;
767 	int flags = 0, skip_count = 0;
768 	int error = Z_STREAM_ERROR, done_reading = 0;
769 	uLong crc = 0;
770 	ssize_t wr;
771 	int needmore = 0;
772 
773 #define ADVANCE()       { z.next_in++; z.avail_in--; }
774 
775 	if ((outbufp = malloc(BUFLEN)) == NULL) {
776 		maybe_err("malloc failed");
777 		goto out2;
778 	}
779 	if ((inbufp = malloc(BUFLEN)) == NULL) {
780 		maybe_err("malloc failed");
781 		goto out1;
782 	}
783 
784 	memset(&z, 0, sizeof z);
785 	z.avail_in = prelen;
786 	z.next_in = (unsigned char *)pre;
787 	z.avail_out = BUFLEN;
788 	z.next_out = (unsigned char *)outbufp;
789 	z.zalloc = NULL;
790 	z.zfree = NULL;
791 	z.opaque = 0;
792 
793 	in_tot = prelen;
794 	out_tot = 0;
795 
796 	for (;;) {
797 		check_siginfo();
798 		if ((z.avail_in == 0 || needmore) && done_reading == 0) {
799 			ssize_t in_size;
800 
801 			if (z.avail_in > 0) {
802 				memmove(inbufp, z.next_in, z.avail_in);
803 			}
804 			z.next_in = (unsigned char *)inbufp;
805 			in_size = read(in, z.next_in + z.avail_in,
806 			    BUFLEN - z.avail_in);
807 
808 			if (in_size == -1) {
809 				maybe_warn("failed to read stdin");
810 				goto stop_and_fail;
811 			} else if (in_size == 0) {
812 				done_reading = 1;
813 			}
814 			infile_newdata(in_size);
815 
816 			z.avail_in += in_size;
817 			needmore = 0;
818 
819 			in_tot += in_size;
820 		}
821 		if (z.avail_in == 0) {
822 			if (done_reading && state != GZSTATE_MAGIC0) {
823 				maybe_warnx("%s: unexpected end of file",
824 					    filename);
825 				goto stop_and_fail;
826 			}
827 			goto stop;
828 		}
829 		switch (state) {
830 		case GZSTATE_MAGIC0:
831 			if (*z.next_in != GZIP_MAGIC0) {
832 				if (in_tot > 0) {
833 					maybe_warnx("%s: trailing garbage "
834 						    "ignored", filename);
835 					exit_value = 2;
836 					goto stop;
837 				}
838 				maybe_warnx("input not gziped (MAGIC0)");
839 				goto stop_and_fail;
840 			}
841 			ADVANCE();
842 			state++;
843 			out_sub_tot = 0;
844 			crc = crc32(0L, Z_NULL, 0);
845 			break;
846 
847 		case GZSTATE_MAGIC1:
848 			if (*z.next_in != GZIP_MAGIC1 &&
849 			    *z.next_in != GZIP_OMAGIC1) {
850 				maybe_warnx("input not gziped (MAGIC1)");
851 				goto stop_and_fail;
852 			}
853 			ADVANCE();
854 			state++;
855 			break;
856 
857 		case GZSTATE_METHOD:
858 			if (*z.next_in != Z_DEFLATED) {
859 				maybe_warnx("unknown compression method");
860 				goto stop_and_fail;
861 			}
862 			ADVANCE();
863 			state++;
864 			break;
865 
866 		case GZSTATE_FLAGS:
867 			flags = *z.next_in;
868 			ADVANCE();
869 			skip_count = 6;
870 			state++;
871 			break;
872 
873 		case GZSTATE_SKIPPING:
874 			if (skip_count > 0) {
875 				skip_count--;
876 				ADVANCE();
877 			} else
878 				state++;
879 			break;
880 
881 		case GZSTATE_EXTRA:
882 			if ((flags & EXTRA_FIELD) == 0) {
883 				state = GZSTATE_ORIGNAME;
884 				break;
885 			}
886 			skip_count = *z.next_in;
887 			ADVANCE();
888 			state++;
889 			break;
890 
891 		case GZSTATE_EXTRA2:
892 			skip_count |= ((*z.next_in) << 8);
893 			ADVANCE();
894 			state++;
895 			break;
896 
897 		case GZSTATE_EXTRA3:
898 			if (skip_count > 0) {
899 				skip_count--;
900 				ADVANCE();
901 			} else
902 				state++;
903 			break;
904 
905 		case GZSTATE_ORIGNAME:
906 			if ((flags & ORIG_NAME) == 0) {
907 				state++;
908 				break;
909 			}
910 			if (*z.next_in == 0)
911 				state++;
912 			ADVANCE();
913 			break;
914 
915 		case GZSTATE_COMMENT:
916 			if ((flags & COMMENT) == 0) {
917 				state++;
918 				break;
919 			}
920 			if (*z.next_in == 0)
921 				state++;
922 			ADVANCE();
923 			break;
924 
925 		case GZSTATE_HEAD_CRC1:
926 			if (flags & HEAD_CRC)
927 				skip_count = 2;
928 			else
929 				skip_count = 0;
930 			state++;
931 			break;
932 
933 		case GZSTATE_HEAD_CRC2:
934 			if (skip_count > 0) {
935 				skip_count--;
936 				ADVANCE();
937 			} else
938 				state++;
939 			break;
940 
941 		case GZSTATE_INIT:
942 			if (inflateInit2(&z, -MAX_WBITS) != Z_OK) {
943 				maybe_warnx("failed to inflateInit");
944 				goto stop_and_fail;
945 			}
946 			state++;
947 			break;
948 
949 		case GZSTATE_READ:
950 			error = inflate(&z, Z_FINISH);
951 			switch (error) {
952 			/* Z_BUF_ERROR goes with Z_FINISH... */
953 			case Z_BUF_ERROR:
954 				if (z.avail_out > 0 && !done_reading)
955 					continue;
956 
957 			case Z_STREAM_END:
958 			case Z_OK:
959 				break;
960 
961 			case Z_NEED_DICT:
962 				maybe_warnx("Z_NEED_DICT error");
963 				goto stop_and_fail;
964 			case Z_DATA_ERROR:
965 				maybe_warnx("data stream error");
966 				goto stop_and_fail;
967 			case Z_STREAM_ERROR:
968 				maybe_warnx("internal stream error");
969 				goto stop_and_fail;
970 			case Z_MEM_ERROR:
971 				maybe_warnx("memory allocation error");
972 				goto stop_and_fail;
973 
974 			default:
975 				maybe_warn("unknown error from inflate(): %d",
976 				    error);
977 			}
978 			wr = BUFLEN - z.avail_out;
979 
980 			if (wr != 0) {
981 				crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr);
982 				if (
983 #ifndef SMALL
984 				    /* don't write anything with -t */
985 				    tflag == 0 &&
986 #endif
987 				    write_retry(out, outbufp, wr) != wr) {
988 					maybe_warn("error writing to output");
989 					goto stop_and_fail;
990 				}
991 
992 				out_tot += wr;
993 				out_sub_tot += wr;
994 			}
995 
996 			if (error == Z_STREAM_END) {
997 				inflateEnd(&z);
998 				state++;
999 			}
1000 
1001 			z.next_out = (unsigned char *)outbufp;
1002 			z.avail_out = BUFLEN;
1003 
1004 			break;
1005 		case GZSTATE_CRC:
1006 			{
1007 				uLong origcrc;
1008 
1009 				if (z.avail_in < 4) {
1010 					if (!done_reading) {
1011 						needmore = 1;
1012 						continue;
1013 					}
1014 					maybe_warnx("truncated input");
1015 					goto stop_and_fail;
1016 				}
1017 				origcrc = ((unsigned)z.next_in[0] & 0xff) |
1018 					((unsigned)z.next_in[1] & 0xff) << 8 |
1019 					((unsigned)z.next_in[2] & 0xff) << 16 |
1020 					((unsigned)z.next_in[3] & 0xff) << 24;
1021 				if (origcrc != crc) {
1022 					maybe_warnx("invalid compressed"
1023 					     " data--crc error");
1024 					goto stop_and_fail;
1025 				}
1026 			}
1027 
1028 			z.avail_in -= 4;
1029 			z.next_in += 4;
1030 
1031 			if (!z.avail_in && done_reading) {
1032 				goto stop;
1033 			}
1034 			state++;
1035 			break;
1036 		case GZSTATE_LEN:
1037 			{
1038 				uLong origlen;
1039 
1040 				if (z.avail_in < 4) {
1041 					if (!done_reading) {
1042 						needmore = 1;
1043 						continue;
1044 					}
1045 					maybe_warnx("truncated input");
1046 					goto stop_and_fail;
1047 				}
1048 				origlen = ((unsigned)z.next_in[0] & 0xff) |
1049 					((unsigned)z.next_in[1] & 0xff) << 8 |
1050 					((unsigned)z.next_in[2] & 0xff) << 16 |
1051 					((unsigned)z.next_in[3] & 0xff) << 24;
1052 
1053 				if (origlen != out_sub_tot) {
1054 					maybe_warnx("invalid compressed"
1055 					     " data--length error");
1056 					goto stop_and_fail;
1057 				}
1058 			}
1059 
1060 			z.avail_in -= 4;
1061 			z.next_in += 4;
1062 
1063 			if (error < 0) {
1064 				maybe_warnx("decompression error");
1065 				goto stop_and_fail;
1066 			}
1067 			state = GZSTATE_MAGIC0;
1068 			break;
1069 		}
1070 		continue;
1071 stop_and_fail:
1072 		out_tot = -1;
1073 stop:
1074 		break;
1075 	}
1076 	if (state > GZSTATE_INIT)
1077 		inflateEnd(&z);
1078 
1079 	free(inbufp);
1080 out1:
1081 	free(outbufp);
1082 out2:
1083 	if (gsizep)
1084 		*gsizep = in_tot;
1085 	return (out_tot);
1086 }
1087 
1088 #ifndef SMALL
1089 /*
1090  * set the owner, mode, flags & utimes using the given file descriptor.
1091  * file is only used in possible warning messages.
1092  */
1093 static void
1094 copymodes(int fd, const struct stat *sbp, const char *file)
1095 {
1096 	struct timespec times[2];
1097 	struct stat sb;
1098 
1099 	/*
1100 	 * If we have no info on the input, give this file some
1101 	 * default values and return..
1102 	 */
1103 	if (sbp == NULL) {
1104 		mode_t mask = umask(022);
1105 
1106 		(void)fchmod(fd, DEFFILEMODE & ~mask);
1107 		(void)umask(mask);
1108 		return;
1109 	}
1110 	sb = *sbp;
1111 
1112 	/* if the chown fails, remove set-id bits as-per compress(1) */
1113 	if (fchown(fd, sb.st_uid, sb.st_gid) < 0) {
1114 		if (errno != EPERM)
1115 			maybe_warn("couldn't fchown: %s", file);
1116 		sb.st_mode &= ~(S_ISUID|S_ISGID);
1117 	}
1118 
1119 	/* we only allow set-id and the 9 normal permission bits */
1120 	sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
1121 	if (fchmod(fd, sb.st_mode) < 0)
1122 		maybe_warn("couldn't fchmod: %s", file);
1123 
1124 	times[0] = sb.st_atim;
1125 	times[1] = sb.st_mtim;
1126 	if (futimens(fd, times) < 0)
1127 		maybe_warn("couldn't futimens: %s", file);
1128 
1129 	/* only try flags if they exist already */
1130         if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0)
1131 		maybe_warn("couldn't fchflags: %s", file);
1132 }
1133 #endif
1134 
1135 /* what sort of file is this? */
1136 static enum filetype
1137 file_gettype(u_char *buf)
1138 {
1139 
1140 	if (buf[0] == GZIP_MAGIC0 &&
1141 	    (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
1142 		return FT_GZIP;
1143 	else
1144 #ifndef NO_BZIP2_SUPPORT
1145 	if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
1146 	    buf[3] >= '0' && buf[3] <= '9')
1147 		return FT_BZIP2;
1148 	else
1149 #endif
1150 #ifndef NO_COMPRESS_SUPPORT
1151 	if (memcmp(buf, Z_MAGIC, 2) == 0)
1152 		return FT_Z;
1153 	else
1154 #endif
1155 #ifndef NO_PACK_SUPPORT
1156 	if (memcmp(buf, PACK_MAGIC, 2) == 0)
1157 		return FT_PACK;
1158 	else
1159 #endif
1160 #ifndef NO_XZ_SUPPORT
1161 	if (memcmp(buf, XZ_MAGIC, 4) == 0)	/* XXX: We only have 4 bytes */
1162 		return FT_XZ;
1163 	else
1164 #endif
1165 		return FT_UNKNOWN;
1166 }
1167 
1168 #ifndef SMALL
1169 /* check the outfile is OK. */
1170 static int
1171 check_outfile(const char *outfile)
1172 {
1173 	struct stat sb;
1174 	int ok = 1;
1175 
1176 	if (lflag == 0 && stat(outfile, &sb) == 0) {
1177 		if (fflag)
1178 			unlink(outfile);
1179 		else if (isatty(STDIN_FILENO)) {
1180 			char ans[10] = { 'n', '\0' };	/* default */
1181 
1182 			fprintf(stderr, "%s already exists -- do you wish to "
1183 					"overwrite (y or n)? " , outfile);
1184 			(void)fgets(ans, sizeof(ans) - 1, stdin);
1185 			if (ans[0] != 'y' && ans[0] != 'Y') {
1186 				fprintf(stderr, "\tnot overwriting\n");
1187 				ok = 0;
1188 			} else
1189 				unlink(outfile);
1190 		} else {
1191 			maybe_warnx("%s already exists -- skipping", outfile);
1192 			ok = 0;
1193 		}
1194 	}
1195 	return ok;
1196 }
1197 
1198 static void
1199 unlink_input(const char *file, const struct stat *sb)
1200 {
1201 	struct stat nsb;
1202 
1203 	if (kflag)
1204 		return;
1205 	if (stat(file, &nsb) != 0)
1206 		/* Must be gone already */
1207 		return;
1208 	if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
1209 		/* Definitely a different file */
1210 		return;
1211 	unlink(file);
1212 }
1213 
1214 static void
1215 got_sigint(int signo __unused)
1216 {
1217 
1218 	if (remove_file != NULL)
1219 		unlink(remove_file);
1220 	_exit(2);
1221 }
1222 
1223 static void
1224 got_siginfo(int signo __unused)
1225 {
1226 
1227 	print_info = 1;
1228 }
1229 
1230 static void
1231 setup_signals(void)
1232 {
1233 
1234 	signal(SIGINFO, got_siginfo);
1235 	signal(SIGINT, got_sigint);
1236 }
1237 
1238 static	void
1239 infile_newdata(size_t newdata)
1240 {
1241 
1242 	infile_current += newdata;
1243 }
1244 #endif
1245 
1246 static	void
1247 infile_set(const char *newinfile, off_t total)
1248 {
1249 
1250 	if (newinfile)
1251 		infile = newinfile;
1252 #ifndef SMALL
1253 	infile_total = total;
1254 #endif
1255 }
1256 
1257 static	void
1258 infile_clear(void)
1259 {
1260 
1261 	infile = NULL;
1262 #ifndef SMALL
1263 	infile_total = infile_current = 0;
1264 #endif
1265 }
1266 
1267 static const suffixes_t *
1268 check_suffix(char *file, int xlate)
1269 {
1270 	const suffixes_t *s;
1271 	int len = strlen(file);
1272 	char *sp;
1273 
1274 	for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
1275 		/* if it doesn't fit in "a.suf", don't bother */
1276 		if (s->ziplen >= len)
1277 			continue;
1278 		sp = file + len - s->ziplen;
1279 		if (strcmp(s->zipped, sp) != 0)
1280 			continue;
1281 		if (xlate)
1282 			strcpy(sp, s->normal);
1283 		return s;
1284 	}
1285 	return NULL;
1286 }
1287 
1288 /*
1289  * compress the given file: create a corresponding .gz file and remove the
1290  * original.
1291  */
1292 static off_t
1293 file_compress(char *file, char *outfile, size_t outsize)
1294 {
1295 	int in;
1296 	int out;
1297 	off_t size, in_size;
1298 #ifndef SMALL
1299 	struct stat isb, osb;
1300 	const suffixes_t *suff;
1301 #endif
1302 
1303 	in = open(file, O_RDONLY);
1304 	if (in == -1) {
1305 		maybe_warn("can't open %s", file);
1306 		return (-1);
1307 	}
1308 
1309 #ifndef SMALL
1310 	if (fstat(in, &isb) != 0) {
1311 		maybe_warn("couldn't stat: %s", file);
1312 		close(in);
1313 		return (-1);
1314 	}
1315 #endif
1316 
1317 #ifndef SMALL
1318 	if (fstat(in, &isb) != 0) {
1319 		close(in);
1320 		maybe_warn("can't stat %s", file);
1321 		return -1;
1322 	}
1323 	infile_set(file, isb.st_size);
1324 #endif
1325 
1326 	if (cflag == 0) {
1327 #ifndef SMALL
1328 		if (isb.st_nlink > 1 && fflag == 0) {
1329 			maybe_warnx("%s has %ju other link%s -- "
1330 				    "skipping", file,
1331 				    (uintmax_t)isb.st_nlink - 1,
1332 				    isb.st_nlink == 1 ? "" : "s");
1333 			close(in);
1334 			return -1;
1335 		}
1336 
1337 		if (fflag == 0 && (suff = check_suffix(file, 0)) &&
1338 		    suff->zipped[0] != 0) {
1339 			maybe_warnx("%s already has %s suffix -- unchanged",
1340 			    file, suff->zipped);
1341 			close(in);
1342 			return (-1);
1343 		}
1344 #endif
1345 
1346 		/* Add (usually) .gz to filename */
1347 		if ((size_t)snprintf(outfile, outsize, "%s%s",
1348 		    file, suffixes[0].zipped) >= outsize)
1349 			memcpy(outfile + outsize - suffixes[0].ziplen - 1,
1350 			    suffixes[0].zipped, suffixes[0].ziplen + 1);
1351 
1352 #ifndef SMALL
1353 		if (check_outfile(outfile) == 0) {
1354 			close(in);
1355 			return (-1);
1356 		}
1357 #endif
1358 	}
1359 
1360 	if (cflag == 0) {
1361 		out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
1362 		if (out == -1) {
1363 			maybe_warn("could not create output: %s", outfile);
1364 			fclose(stdin);
1365 			return (-1);
1366 		}
1367 #ifndef SMALL
1368 		remove_file = outfile;
1369 #endif
1370 	} else
1371 		out = STDOUT_FILENO;
1372 
1373 	in_size = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
1374 
1375 	(void)close(in);
1376 
1377 	/*
1378 	 * If there was an error, in_size will be -1.
1379 	 * If we compressed to stdout, just return the size.
1380 	 * Otherwise stat the file and check it is the correct size.
1381 	 * We only blow away the file if we can stat the output and it
1382 	 * has the expected size.
1383 	 */
1384 	if (cflag != 0)
1385 		return in_size == -1 ? -1 : size;
1386 
1387 #ifndef SMALL
1388 	if (fstat(out, &osb) != 0) {
1389 		maybe_warn("couldn't stat: %s", outfile);
1390 		goto bad_outfile;
1391 	}
1392 
1393 	if (osb.st_size != size) {
1394 		maybe_warnx("output file: %s wrong size (%ju != %ju), deleting",
1395 		    outfile, (uintmax_t)osb.st_size, (uintmax_t)size);
1396 		goto bad_outfile;
1397 	}
1398 
1399 	copymodes(out, &isb, outfile);
1400 	remove_file = NULL;
1401 #endif
1402 	if (close(out) == -1)
1403 		maybe_warn("couldn't close output");
1404 
1405 	/* output is good, ok to delete input */
1406 	unlink_input(file, &isb);
1407 	return (size);
1408 
1409 #ifndef SMALL
1410     bad_outfile:
1411 	if (close(out) == -1)
1412 		maybe_warn("couldn't close output");
1413 
1414 	maybe_warnx("leaving original %s", file);
1415 	unlink(outfile);
1416 	return (size);
1417 #endif
1418 }
1419 
1420 /* uncompress the given file and remove the original */
1421 static off_t
1422 file_uncompress(char *file, char *outfile, size_t outsize)
1423 {
1424 	struct stat isb, osb;
1425 	off_t size;
1426 	ssize_t rbytes;
1427 	unsigned char header1[4];
1428 	enum filetype method;
1429 	int fd, ofd, zfd = -1;
1430 	size_t in_size;
1431 #ifndef SMALL
1432 	ssize_t rv;
1433 	time_t timestamp = 0;
1434 	char name[PATH_MAX + 1];
1435 #endif
1436 
1437 	/* gather the old name info */
1438 
1439 	fd = open(file, O_RDONLY);
1440 	if (fd < 0) {
1441 		maybe_warn("can't open %s", file);
1442 		goto lose;
1443 	}
1444 	if (fstat(fd, &isb) != 0) {
1445 		close(fd);
1446 		maybe_warn("can't stat %s", file);
1447 		goto lose;
1448 	}
1449 	if (S_ISREG(isb.st_mode))
1450 		in_size = isb.st_size;
1451 	else
1452 		in_size = 0;
1453 	infile_set(file, in_size);
1454 
1455 	strlcpy(outfile, file, outsize);
1456 	if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
1457 		maybe_warnx("%s: unknown suffix -- ignored", file);
1458 		goto lose;
1459 	}
1460 
1461 	rbytes = read(fd, header1, sizeof header1);
1462 	if (rbytes != sizeof header1) {
1463 		/* we don't want to fail here. */
1464 #ifndef SMALL
1465 		if (fflag)
1466 			goto lose;
1467 #endif
1468 		if (rbytes == -1)
1469 			maybe_warn("can't read %s", file);
1470 		else
1471 			goto unexpected_EOF;
1472 		goto lose;
1473 	}
1474 	infile_newdata(rbytes);
1475 
1476 	method = file_gettype(header1);
1477 #ifndef SMALL
1478 	if (fflag == 0 && method == FT_UNKNOWN) {
1479 		maybe_warnx("%s: not in gzip format", file);
1480 		goto lose;
1481 	}
1482 
1483 #endif
1484 
1485 #ifndef SMALL
1486 	if (method == FT_GZIP && Nflag) {
1487 		unsigned char ts[4];	/* timestamp */
1488 
1489 		rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP);
1490 		if (rv >= 0 && rv < (ssize_t)(sizeof ts))
1491 			goto unexpected_EOF;
1492 		if (rv == -1) {
1493 			if (!fflag)
1494 				maybe_warn("can't read %s", file);
1495 			goto lose;
1496 		}
1497 		infile_newdata(rv);
1498 		timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0];
1499 
1500 		if (header1[3] & ORIG_NAME) {
1501 			rbytes = pread(fd, name, sizeof(name) - 1, GZIP_ORIGNAME);
1502 			if (rbytes < 0) {
1503 				maybe_warn("can't read %s", file);
1504 				goto lose;
1505 			}
1506 			if (name[0] != '\0') {
1507 				char *dp, *nf;
1508 
1509 				/* Make sure that name is NUL-terminated */
1510 				name[rbytes] = '\0';
1511 
1512 				/* strip saved directory name */
1513 				nf = strrchr(name, '/');
1514 				if (nf == NULL)
1515 					nf = name;
1516 				else
1517 					nf++;
1518 
1519 				/* preserve original directory name */
1520 				dp = strrchr(file, '/');
1521 				if (dp == NULL)
1522 					dp = file;
1523 				else
1524 					dp++;
1525 				snprintf(outfile, outsize, "%.*s%.*s",
1526 						(int) (dp - file),
1527 						file, (int) rbytes, nf);
1528 			}
1529 		}
1530 	}
1531 #endif
1532 	lseek(fd, 0, SEEK_SET);
1533 
1534 	if (cflag == 0 || lflag) {
1535 #ifndef SMALL
1536 		if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
1537 			maybe_warnx("%s has %ju other links -- skipping",
1538 			    file, (uintmax_t)isb.st_nlink - 1);
1539 			goto lose;
1540 		}
1541 		if (nflag == 0 && timestamp)
1542 			isb.st_mtime = timestamp;
1543 		if (check_outfile(outfile) == 0)
1544 			goto lose;
1545 #endif
1546 	}
1547 
1548 	if (cflag)
1549 		zfd = STDOUT_FILENO;
1550 	else if (lflag)
1551 		zfd = -1;
1552 	else {
1553 		zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
1554 		if (zfd == STDOUT_FILENO) {
1555 			/* We won't close STDOUT_FILENO later... */
1556 			zfd = dup(zfd);
1557 			close(STDOUT_FILENO);
1558 		}
1559 		if (zfd == -1) {
1560 			maybe_warn("can't open %s", outfile);
1561 			goto lose;
1562 		}
1563 		remove_file = outfile;
1564 	}
1565 
1566 	switch (method) {
1567 #ifndef NO_BZIP2_SUPPORT
1568 	case FT_BZIP2:
1569 		/* XXX */
1570 		if (lflag) {
1571 			maybe_warnx("no -l with bzip2 files");
1572 			goto lose;
1573 		}
1574 
1575 		size = unbzip2(fd, zfd, NULL, 0, NULL);
1576 		break;
1577 #endif
1578 
1579 #ifndef NO_COMPRESS_SUPPORT
1580 	case FT_Z: {
1581 		FILE *in, *out;
1582 
1583 		/* XXX */
1584 		if (lflag) {
1585 			maybe_warnx("no -l with Lempel-Ziv files");
1586 			goto lose;
1587 		}
1588 
1589 		if ((in = zdopen(fd)) == NULL) {
1590 			maybe_warn("zdopen for read: %s", file);
1591 			goto lose;
1592 		}
1593 
1594 		out = fdopen(dup(zfd), "w");
1595 		if (out == NULL) {
1596 			maybe_warn("fdopen for write: %s", outfile);
1597 			fclose(in);
1598 			goto lose;
1599 		}
1600 
1601 		size = zuncompress(in, out, NULL, 0, NULL);
1602 		/* need to fclose() if ferror() is true... */
1603 		if (ferror(in) | fclose(in)) {
1604 			maybe_warn("failed infile fclose");
1605 			unlink(outfile);
1606 			(void)fclose(out);
1607 		}
1608 		if (fclose(out) != 0) {
1609 			maybe_warn("failed outfile fclose");
1610 			unlink(outfile);
1611 			goto lose;
1612 		}
1613 		break;
1614 	}
1615 #endif
1616 
1617 #ifndef NO_PACK_SUPPORT
1618 	case FT_PACK:
1619 		if (lflag) {
1620 			maybe_warnx("no -l with packed files");
1621 			goto lose;
1622 		}
1623 
1624 		size = unpack(fd, zfd, NULL, 0, NULL);
1625 		break;
1626 #endif
1627 
1628 #ifndef NO_XZ_SUPPORT
1629 	case FT_XZ:
1630 		if (lflag) {
1631 			maybe_warnx("no -l with xz files");
1632 			goto lose;
1633 		}
1634 
1635 		size = unxz(fd, zfd, NULL, 0, NULL);
1636 		break;
1637 #endif
1638 
1639 #ifndef SMALL
1640 	case FT_UNKNOWN:
1641 		if (lflag) {
1642 			maybe_warnx("no -l for unknown filetypes");
1643 			goto lose;
1644 		}
1645 		size = cat_fd(NULL, 0, NULL, fd);
1646 		break;
1647 #endif
1648 	default:
1649 		if (lflag) {
1650 			print_list(fd, in_size, outfile, isb.st_mtime);
1651 			close(fd);
1652 			return -1;	/* XXX */
1653 		}
1654 
1655 		size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
1656 		break;
1657 	}
1658 
1659 	if (close(fd) != 0)
1660 		maybe_warn("couldn't close input");
1661 	if (zfd != STDOUT_FILENO && close(zfd) != 0)
1662 		maybe_warn("couldn't close output");
1663 
1664 	if (size == -1) {
1665 		if (cflag == 0)
1666 			unlink(outfile);
1667 		maybe_warnx("%s: uncompress failed", file);
1668 		return -1;
1669 	}
1670 
1671 	/* if testing, or we uncompressed to stdout, this is all we need */
1672 #ifndef SMALL
1673 	if (tflag)
1674 		return size;
1675 #endif
1676 	/* if we are uncompressing to stdin, don't remove the file. */
1677 	if (cflag)
1678 		return size;
1679 
1680 	/*
1681 	 * if we create a file...
1682 	 */
1683 	/*
1684 	 * if we can't stat the file don't remove the file.
1685 	 */
1686 
1687 	ofd = open(outfile, O_RDWR, 0);
1688 	if (ofd == -1) {
1689 		maybe_warn("couldn't open (leaving original): %s",
1690 			   outfile);
1691 		return -1;
1692 	}
1693 	if (fstat(ofd, &osb) != 0) {
1694 		maybe_warn("couldn't stat (leaving original): %s",
1695 			   outfile);
1696 		close(ofd);
1697 		return -1;
1698 	}
1699 	if (osb.st_size != size) {
1700 		maybe_warnx("stat gave different size: %ju != %ju (leaving original)",
1701 		    (uintmax_t)size, (uintmax_t)osb.st_size);
1702 		close(ofd);
1703 		unlink(outfile);
1704 		return -1;
1705 	}
1706 #ifndef SMALL
1707 	copymodes(ofd, &isb, outfile);
1708 	remove_file = NULL;
1709 #endif
1710 	close(ofd);
1711 	unlink_input(file, &isb);
1712 	return size;
1713 
1714     unexpected_EOF:
1715 	maybe_warnx("%s: unexpected end of file", file);
1716     lose:
1717 	if (fd != -1)
1718 		close(fd);
1719 	if (zfd != -1 && zfd != STDOUT_FILENO)
1720 		close(fd);
1721 	return -1;
1722 }
1723 
1724 #ifndef SMALL
1725 static void
1726 check_siginfo(void)
1727 {
1728 	if (print_info == 0)
1729 		return;
1730 	if (infile) {
1731 		if (infile_total) {
1732 			int pcent = (int)((100.0 * infile_current) / infile_total);
1733 
1734 			fprintf(stderr, "%s: done %llu/%llu bytes %d%%\n",
1735 				infile, (unsigned long long)infile_current,
1736 				(unsigned long long)infile_total, pcent);
1737 		} else
1738 			fprintf(stderr, "%s: done %llu bytes\n",
1739 				infile, (unsigned long long)infile_current);
1740 	}
1741 	print_info = 0;
1742 }
1743 
1744 static off_t
1745 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd)
1746 {
1747 	char buf[BUFLEN];
1748 	off_t in_tot;
1749 	ssize_t w;
1750 
1751 	in_tot = count;
1752 	w = write_retry(STDOUT_FILENO, prepend, count);
1753 	if (w == -1 || (size_t)w != count) {
1754 		maybe_warn("write to stdout");
1755 		return -1;
1756 	}
1757 	for (;;) {
1758 		ssize_t rv;
1759 
1760 		rv = read(fd, buf, sizeof buf);
1761 		if (rv == 0)
1762 			break;
1763 		if (rv < 0) {
1764 			maybe_warn("read from fd %d", fd);
1765 			break;
1766 		}
1767 		infile_newdata(rv);
1768 
1769 		if (write_retry(STDOUT_FILENO, buf, rv) != rv) {
1770 			maybe_warn("write to stdout");
1771 			break;
1772 		}
1773 		in_tot += rv;
1774 	}
1775 
1776 	if (gsizep)
1777 		*gsizep = in_tot;
1778 	return (in_tot);
1779 }
1780 #endif
1781 
1782 static void
1783 handle_stdin(void)
1784 {
1785 	struct stat isb;
1786 	unsigned char header1[4];
1787 	size_t in_size;
1788 	off_t usize, gsize;
1789 	enum filetype method;
1790 	ssize_t bytes_read;
1791 #ifndef NO_COMPRESS_SUPPORT
1792 	FILE *in;
1793 #endif
1794 
1795 #ifndef SMALL
1796 	if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
1797 		maybe_warnx("standard input is a terminal -- ignoring");
1798 		goto out;
1799 	}
1800 #endif
1801 
1802 	if (fstat(STDIN_FILENO, &isb) < 0) {
1803 		maybe_warn("fstat");
1804 		goto out;
1805 	}
1806 	if (S_ISREG(isb.st_mode))
1807 		in_size = isb.st_size;
1808 	else
1809 		in_size = 0;
1810 	infile_set("(stdin)", in_size);
1811 
1812 	if (lflag) {
1813 		print_list(STDIN_FILENO, in_size, infile, isb.st_mtime);
1814 		goto out;
1815 	}
1816 
1817 	bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1);
1818 	if (bytes_read == -1) {
1819 		maybe_warn("can't read stdin");
1820 		goto out;
1821 	} else if (bytes_read != sizeof(header1)) {
1822 		maybe_warnx("(stdin): unexpected end of file");
1823 		goto out;
1824 	}
1825 
1826 	method = file_gettype(header1);
1827 	switch (method) {
1828 	default:
1829 #ifndef SMALL
1830 		if (fflag == 0) {
1831 			maybe_warnx("unknown compression format");
1832 			goto out;
1833 		}
1834 		usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO);
1835 		break;
1836 #endif
1837 	case FT_GZIP:
1838 		usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
1839 			      (char *)header1, sizeof header1, &gsize, "(stdin)");
1840 		break;
1841 #ifndef NO_BZIP2_SUPPORT
1842 	case FT_BZIP2:
1843 		usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
1844 				(char *)header1, sizeof header1, &gsize);
1845 		break;
1846 #endif
1847 #ifndef NO_COMPRESS_SUPPORT
1848 	case FT_Z:
1849 		if ((in = zdopen(STDIN_FILENO)) == NULL) {
1850 			maybe_warnx("zopen of stdin");
1851 			goto out;
1852 		}
1853 
1854 		usize = zuncompress(in, stdout, (char *)header1,
1855 		    sizeof header1, &gsize);
1856 		fclose(in);
1857 		break;
1858 #endif
1859 #ifndef NO_PACK_SUPPORT
1860 	case FT_PACK:
1861 		usize = unpack(STDIN_FILENO, STDOUT_FILENO,
1862 			       (char *)header1, sizeof header1, &gsize);
1863 		break;
1864 #endif
1865 #ifndef NO_XZ_SUPPORT
1866 	case FT_XZ:
1867 		usize = unxz(STDIN_FILENO, STDOUT_FILENO,
1868 			     (char *)header1, sizeof header1, &gsize);
1869 		break;
1870 #endif
1871 	}
1872 
1873 #ifndef SMALL
1874         if (vflag && !tflag && usize != -1 && gsize != -1)
1875 		print_verbage(NULL, NULL, usize, gsize);
1876 	if (vflag && tflag)
1877 		print_test("(stdin)", usize != -1);
1878 #else
1879 	(void)&usize;
1880 #endif
1881 
1882 out:
1883 	infile_clear();
1884 }
1885 
1886 static void
1887 handle_stdout(void)
1888 {
1889 	off_t gsize;
1890 #ifndef SMALL
1891 	off_t usize;
1892 	struct stat sb;
1893 	time_t systime;
1894 	uint32_t mtime;
1895 	int ret;
1896 
1897 	infile_set("(stdout)", 0);
1898 
1899 	if (fflag == 0 && isatty(STDOUT_FILENO)) {
1900 		maybe_warnx("standard output is a terminal -- ignoring");
1901 		return;
1902 	}
1903 
1904 	/* If stdin is a file use its mtime, otherwise use current time */
1905 	ret = fstat(STDIN_FILENO, &sb);
1906 	if (ret < 0) {
1907 		maybe_warn("Can't stat stdin");
1908 		return;
1909 	}
1910 
1911 	if (S_ISREG(sb.st_mode)) {
1912 		infile_set("(stdout)", sb.st_size);
1913 		mtime = (uint32_t)sb.st_mtime;
1914 	} else {
1915 		systime = time(NULL);
1916 		if (systime == -1) {
1917 			maybe_warn("time");
1918 			return;
1919 		}
1920 		mtime = (uint32_t)systime;
1921 	}
1922 
1923 	usize =
1924 #endif
1925 		gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime);
1926 #ifndef SMALL
1927         if (vflag && !tflag && usize != -1 && gsize != -1)
1928 		print_verbage(NULL, NULL, usize, gsize);
1929 #endif
1930 }
1931 
1932 /* do what is asked for, for the path name */
1933 static void
1934 handle_pathname(char *path)
1935 {
1936 	char *opath = path, *s = NULL;
1937 	ssize_t len;
1938 	int slen;
1939 	struct stat sb;
1940 
1941 	/* check for stdout/stdin */
1942 	if (path[0] == '-' && path[1] == '\0') {
1943 		if (dflag)
1944 			handle_stdin();
1945 		else
1946 			handle_stdout();
1947 		return;
1948 	}
1949 
1950 retry:
1951 	if (stat(path, &sb) != 0 || (fflag == 0 && cflag == 0 &&
1952 	    lstat(path, &sb) != 0)) {
1953 		/* lets try <path>.gz if we're decompressing */
1954 		if (dflag && s == NULL && errno == ENOENT) {
1955 			len = strlen(path);
1956 			slen = suffixes[0].ziplen;
1957 			s = malloc(len + slen + 1);
1958 			if (s == NULL)
1959 				maybe_err("malloc");
1960 			memcpy(s, path, len);
1961 			memcpy(s + len, suffixes[0].zipped, slen + 1);
1962 			path = s;
1963 			goto retry;
1964 		}
1965 		maybe_warn("can't stat: %s", opath);
1966 		goto out;
1967 	}
1968 
1969 	if (S_ISDIR(sb.st_mode)) {
1970 #ifndef SMALL
1971 		if (rflag)
1972 			handle_dir(path);
1973 		else
1974 #endif
1975 			maybe_warnx("%s is a directory", path);
1976 		goto out;
1977 	}
1978 
1979 	if (S_ISREG(sb.st_mode))
1980 		handle_file(path, &sb);
1981 	else
1982 		maybe_warnx("%s is not a regular file", path);
1983 
1984 out:
1985 	if (s)
1986 		free(s);
1987 }
1988 
1989 /* compress/decompress a file */
1990 static void
1991 handle_file(char *file, struct stat *sbp)
1992 {
1993 	off_t usize, gsize;
1994 	char	outfile[PATH_MAX];
1995 
1996 	infile_set(file, sbp->st_size);
1997 	if (dflag) {
1998 		usize = file_uncompress(file, outfile, sizeof(outfile));
1999 #ifndef SMALL
2000 		if (vflag && tflag)
2001 			print_test(file, usize != -1);
2002 #endif
2003 		if (usize == -1)
2004 			return;
2005 		gsize = sbp->st_size;
2006 	} else {
2007 		gsize = file_compress(file, outfile, sizeof(outfile));
2008 		if (gsize == -1)
2009 			return;
2010 		usize = sbp->st_size;
2011 	}
2012 	infile_clear();
2013 
2014 #ifndef SMALL
2015 	if (vflag && !tflag)
2016 		print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
2017 #endif
2018 }
2019 
2020 #ifndef SMALL
2021 /* this is used with -r to recursively descend directories */
2022 static void
2023 handle_dir(char *dir)
2024 {
2025 	char *path_argv[2];
2026 	FTS *fts;
2027 	FTSENT *entry;
2028 
2029 	path_argv[0] = dir;
2030 	path_argv[1] = 0;
2031 	fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
2032 	if (fts == NULL) {
2033 		warn("couldn't fts_open %s", dir);
2034 		return;
2035 	}
2036 
2037 	while ((entry = fts_read(fts))) {
2038 		switch(entry->fts_info) {
2039 		case FTS_D:
2040 		case FTS_DP:
2041 			continue;
2042 
2043 		case FTS_DNR:
2044 		case FTS_ERR:
2045 		case FTS_NS:
2046 			maybe_warn("%s", entry->fts_path);
2047 			continue;
2048 		case FTS_F:
2049 			handle_file(entry->fts_path, entry->fts_statp);
2050 		}
2051 	}
2052 	(void)fts_close(fts);
2053 }
2054 #endif
2055 
2056 /* print a ratio - size reduction as a fraction of uncompressed size */
2057 static void
2058 print_ratio(off_t in, off_t out, FILE *where)
2059 {
2060 	int percent10;	/* 10 * percent */
2061 	off_t diff;
2062 	char buff[8];
2063 	int len;
2064 
2065 	diff = in - out/2;
2066 	if (in == 0 && out == 0)
2067 		percent10 = 0;
2068 	else if (diff < 0)
2069 		/*
2070 		 * Output is more than double size of input! print -99.9%
2071 		 * Quite possibly we've failed to get the original size.
2072 		 */
2073 		percent10 = -999;
2074 	else {
2075 		/*
2076 		 * We only need 12 bits of result from the final division,
2077 		 * so reduce the values until a 32bit division will suffice.
2078 		 */
2079 		while (in > 0x100000) {
2080 			diff >>= 1;
2081 			in >>= 1;
2082 		}
2083 		if (in != 0)
2084 			percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
2085 		else
2086 			percent10 = 0;
2087 	}
2088 
2089 	len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
2090 	/* Move the '.' to before the last digit */
2091 	buff[len - 1] = buff[len - 2];
2092 	buff[len - 2] = '.';
2093 	fprintf(where, "%5s%%", buff);
2094 }
2095 
2096 #ifndef SMALL
2097 /* print compression statistics, and the new name (if there is one!) */
2098 static void
2099 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
2100 {
2101 	if (file)
2102 		fprintf(stderr, "%s:%s  ", file,
2103 		    strlen(file) < 7 ? "\t\t" : "\t");
2104 	print_ratio(usize, gsize, stderr);
2105 	if (nfile)
2106 		fprintf(stderr, " -- replaced with %s", nfile);
2107 	fprintf(stderr, "\n");
2108 	fflush(stderr);
2109 }
2110 
2111 /* print test results */
2112 static void
2113 print_test(const char *file, int ok)
2114 {
2115 
2116 	if (exit_value == 0 && ok == 0)
2117 		exit_value = 1;
2118 	fprintf(stderr, "%s:%s  %s\n", file,
2119 	    strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
2120 	fflush(stderr);
2121 }
2122 #endif
2123 
2124 /* print a file's info ala --list */
2125 /* eg:
2126   compressed uncompressed  ratio uncompressed_name
2127       354841      1679360  78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
2128 */
2129 static void
2130 print_list(int fd, off_t out, const char *outfile, time_t ts)
2131 {
2132 	static int first = 1;
2133 #ifndef SMALL
2134 	static off_t in_tot, out_tot;
2135 	uint32_t crc = 0;
2136 #endif
2137 	off_t in = 0, rv;
2138 
2139 	if (first) {
2140 #ifndef SMALL
2141 		if (vflag)
2142 			printf("method  crc     date  time  ");
2143 #endif
2144 		if (qflag == 0)
2145 			printf("  compressed uncompressed  "
2146 			       "ratio uncompressed_name\n");
2147 	}
2148 	first = 0;
2149 
2150 	/* print totals? */
2151 #ifndef SMALL
2152 	if (fd == -1) {
2153 		in = in_tot;
2154 		out = out_tot;
2155 	} else
2156 #endif
2157 	{
2158 		/* read the last 4 bytes - this is the uncompressed size */
2159 		rv = lseek(fd, (off_t)(-8), SEEK_END);
2160 		if (rv != -1) {
2161 			unsigned char buf[8];
2162 			uint32_t usize;
2163 
2164 			rv = read(fd, (char *)buf, sizeof(buf));
2165 			if (rv == -1)
2166 				maybe_warn("read of uncompressed size");
2167 			else if (rv != sizeof(buf))
2168 				maybe_warnx("read of uncompressed size");
2169 
2170 			else {
2171 				usize = buf[4] | buf[5] << 8 |
2172 					buf[6] << 16 | buf[7] << 24;
2173 				in = (off_t)usize;
2174 #ifndef SMALL
2175 				crc = buf[0] | buf[1] << 8 |
2176 				      buf[2] << 16 | buf[3] << 24;
2177 #endif
2178 			}
2179 		}
2180 	}
2181 
2182 #ifndef SMALL
2183 	if (vflag && fd == -1)
2184 		printf("                            ");
2185 	else if (vflag) {
2186 		char *date = ctime(&ts);
2187 
2188 		/* skip the day, 1/100th second, and year */
2189 		date += 4;
2190 		date[12] = 0;
2191 		printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
2192 	}
2193 	in_tot += in;
2194 	out_tot += out;
2195 #else
2196 	(void)&ts;	/* XXX */
2197 #endif
2198 	printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
2199 	print_ratio(in, out, stdout);
2200 	printf(" %s\n", outfile);
2201 }
2202 
2203 /* display the usage of NetBSD gzip */
2204 static void
2205 usage(void)
2206 {
2207 
2208 	fprintf(stderr, "%s\n", gzip_version);
2209 	fprintf(stderr,
2210 #ifdef SMALL
2211     "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n",
2212 #else
2213     "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n"
2214     " -1 --fast            fastest (worst) compression\n"
2215     " -2 .. -8             set compression level\n"
2216     " -9 --best            best (slowest) compression\n"
2217     " -c --stdout          write to stdout, keep original files\n"
2218     "    --to-stdout\n"
2219     " -d --decompress      uncompress files\n"
2220     "    --uncompress\n"
2221     " -f --force           force overwriting & compress links\n"
2222     " -h --help            display this help\n"
2223     " -k --keep            don't delete input files during operation\n"
2224     " -l --list            list compressed file contents\n"
2225     " -N --name            save or restore original file name and time stamp\n"
2226     " -n --no-name         don't save original file name or time stamp\n"
2227     " -q --quiet           output no warnings\n"
2228     " -r --recursive       recursively compress files in directories\n"
2229     " -S .suf              use suffix .suf instead of .gz\n"
2230     "    --suffix .suf\n"
2231     " -t --test            test compressed file\n"
2232     " -V --version         display program version\n"
2233     " -v --verbose         print extra statistics\n",
2234 #endif
2235 	    getprogname());
2236 	exit(0);
2237 }
2238 
2239 #ifndef SMALL
2240 /* display the license information of FreeBSD gzip */
2241 static void
2242 display_license(void)
2243 {
2244 
2245 	fprintf(stderr, "%s (based on NetBSD gzip 20150113)\n", gzip_version);
2246 	fprintf(stderr, "%s\n", gzip_copyright);
2247 	exit(0);
2248 }
2249 #endif
2250 
2251 /* display the version of NetBSD gzip */
2252 static void
2253 display_version(void)
2254 {
2255 
2256 	fprintf(stderr, "%s\n", gzip_version);
2257 	exit(0);
2258 }
2259 
2260 #ifndef NO_BZIP2_SUPPORT
2261 #include "unbzip2.c"
2262 #endif
2263 #ifndef NO_COMPRESS_SUPPORT
2264 #include "zuncompress.c"
2265 #endif
2266 #ifndef NO_PACK_SUPPORT
2267 #include "unpack.c"
2268 #endif
2269 #ifndef NO_XZ_SUPPORT
2270 #include "unxz.c"
2271 #endif
2272 
2273 static ssize_t
2274 read_retry(int fd, void *buf, size_t sz)
2275 {
2276 	char *cp = buf;
2277 	size_t left = MIN(sz, (size_t) SSIZE_MAX);
2278 
2279 	while (left > 0) {
2280 		ssize_t ret;
2281 
2282 		ret = read(fd, cp, left);
2283 		if (ret == -1) {
2284 			return ret;
2285 		} else if (ret == 0) {
2286 			break; /* EOF */
2287 		}
2288 		cp += ret;
2289 		left -= ret;
2290 	}
2291 
2292 	return sz - left;
2293 }
2294 
2295 static ssize_t
2296 write_retry(int fd, const void *buf, size_t sz)
2297 {
2298 	const char *cp = buf;
2299 	size_t left = MIN(sz, (size_t) SSIZE_MAX);
2300 
2301 	while (left > 0) {
2302 		ssize_t ret;
2303 
2304 		ret = write(fd, cp, left);
2305 		if (ret == -1) {
2306 			return ret;
2307 		} else if (ret == 0) {
2308 			abort();	/* Can't happen */
2309 		}
2310 		cp += ret;
2311 		left -= ret;
2312 	}
2313 
2314 	return sz - left;
2315 }
2316