text: /*	$NetBSD: gzip.c,v 1.116 2018/10/27 11:39:12 skrll Exp $	*/
  
  /*-
   * SPDX-License-Identifier: BSD-2-Clause-NetBSD
   *
   * Copyright (c) 1997, 1998, 2003, 2004, 2006, 2008, 2009, 2010, 2011, 2015, 2017
   *    Matthew R. Green
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   */
  
  #include <sys/cdefs.h>
  #ifndef lint
  __COPYRIGHT("@(#) Copyright (c) 1997, 1998, 2003, 2004, 2006, 2008,\
   2009, 2010, 2011, 2015, 2017 Matthew R. Green.  All rights reserved.");
  __FBSDID("$FreeBSD$");
  #endif /* not lint */
  
  /*
   * gzip.c -- GPL free gzip using zlib.
   *
   * RFC 1950 covers the zlib format
   * RFC 1951 covers the deflate format
   * RFC 1952 covers the gzip format
   *
   * TODO:
   *	- use mmap where possible
   *	- make bzip2/compress -v/-t/-l support work as well as possible
   */
  
  #ifdef __linux__
  static inline unsigned le32dec(const void *s) {
  	const unsigned char *p = (const unsigned char *)s;
  	return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
  }
  #else
  #include <sys/endian.h>
  #endif
  #include <sys/param.h>
  #include <sys/stat.h>
  #include <sys/time.h>
  #include <sys/types.h>
  
  #include <inttypes.h>
  #include <unistd.h>
  #include <stdio.h>
  #include <string.h>
  #include <stdlib.h>
  #include <err.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <zlib.h>
  #include <fts.h>
  #include <libgen.h>
  #include <stdarg.h>
  #include <getopt.h>
  #include <time.h>
  #include <signal.h>
  
  /* what type of file are we dealing with */
  enum filetype {
  	FT_GZIP,
  #ifndef NO_BZIP2_SUPPORT
  	FT_BZIP2,
  #endif
  #ifndef NO_COMPRESS_SUPPORT
  	FT_Z,
  #endif
  #ifndef NO_PACK_SUPPORT
  	FT_PACK,
  #endif
  #ifndef NO_XZ_SUPPORT
  	FT_XZ,
  #endif
  #ifndef NO_LZ_SUPPORT
  	FT_LZ,
  #endif
  	FT_LAST,
  	FT_UNKNOWN
  };
  
  #ifndef NO_BZIP2_SUPPORT
  #include <bzlib.h>
  
  #define BZ2_SUFFIX	".bz2"
  #define BZIP2_MAGIC	"BZh"
  #endif
  
  #ifndef NO_COMPRESS_SUPPORT
  #define Z_SUFFIX	".Z"
  #define Z_MAGIC		"\037\235"
  #endif
  
  #ifndef NO_PACK_SUPPORT
  #define PACK_MAGIC	"\037\036"
  #endif
  
  #ifndef NO_XZ_SUPPORT
  #include <lzma.h>
  #define XZ_SUFFIX	".xz"
  #define XZ_MAGIC	"\3757zXZ"
  #endif
  
  #ifndef NO_LZ_SUPPORT
  #define LZ_SUFFIX	".lz"
  #define LZ_MAGIC	"LZIP"
  #endif
  
  #define GZ_SUFFIX	".gz"
  
  #define BUFLEN		(64 * 1024)
  
  #define GZIP_MAGIC0	0x1F
  #define GZIP_MAGIC1	0x8B
  #define GZIP_OMAGIC1	0x9E
  
  #define GZIP_TIMESTAMP	(off_t)4
  #define GZIP_ORIGNAME	(off_t)10
  
  #define HEAD_CRC	0x02
  #define EXTRA_FIELD	0x04
  #define ORIG_NAME	0x08
  #define COMMENT		0x10
  
  #define OS_CODE		3	/* Unix */
  
  typedef struct {
      const char	*zipped;
      int		ziplen;
      const char	*normal;	/* for unzip - must not be longer than zipped */
  } suffixes_t;
  static suffixes_t suffixes[] = {
  #define	SUFFIX(Z, N) {Z, sizeof Z - 1, N}
  	SUFFIX(GZ_SUFFIX,	""),	/* Overwritten by -S .xxx */
  #ifndef SMALL
  	SUFFIX(GZ_SUFFIX,	""),
  	SUFFIX(".z",		""),
  	SUFFIX("-gz",		""),
  	SUFFIX("-z",		""),
  	SUFFIX("_z",		""),
  	SUFFIX(".taz",		".tar"),
  	SUFFIX(".tgz",		".tar"),
  #ifndef NO_BZIP2_SUPPORT
  	SUFFIX(BZ2_SUFFIX,	""),
  	SUFFIX(".tbz",		".tar"),
  	SUFFIX(".tbz2",		".tar"),
  #endif
  #ifndef NO_COMPRESS_SUPPORT
  	SUFFIX(Z_SUFFIX,	""),
  #endif
  #ifndef NO_XZ_SUPPORT
  	SUFFIX(XZ_SUFFIX,	""),
  #endif
  #ifndef NO_LZ_SUPPORT
  	SUFFIX(LZ_SUFFIX,	""),
  #endif
  	SUFFIX(GZ_SUFFIX,	""),	/* Overwritten by -S "" */
  #endif /* SMALL */
  #undef SUFFIX
  };
  #define NUM_SUFFIXES (nitems(suffixes))
  #define SUFFIX_MAXLEN	30
  
  static	const char	gzip_version[] = "FreeBSD gzip 20190107";
  
  #ifndef SMALL
  static	const char	gzip_copyright[] = \
  "   Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green\n"
  "   All rights reserved.\n"
  "\n"
  "   Redistribution and use in source and binary forms, with or without\n"
  "   modification, are permitted provided that the following conditions\n"
  "   are met:\n"
  "   1. Redistributions of source code must retain the above copyright\n"
  "      notice, this list of conditions and the following disclaimer.\n"
  "   2. Redistributions in binary form must reproduce the above copyright\n"
  "      notice, this list of conditions and the following disclaimer in the\n"
  "      documentation and/or other materials provided with the distribution.\n"
  "\n"
  "   THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n"
  "   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n"
  "   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n"
  "   IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n"
  "   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,\n"
  "   BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n"
  "   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED\n"
  "   AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,\n"
  "   OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\n"
  "   OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\n"
  "   SUCH DAMAGE.";
  #endif
  
  static	int	cflag;			/* stdout mode */
  static	int	dflag;			/* decompress mode */
  static	int	lflag;			/* list mode */
  static	int	numflag = 6;		/* gzip -1..-9 value */
  
  static	const char *remove_file = NULL;	/* file to be removed upon SIGINT */
  
  static	int	fflag;			/* force mode */
  #ifndef SMALL
  static	int	kflag;			/* don't delete input files */
  static	int	nflag;			/* don't save name/timestamp */
  static	int	Nflag;			/* don't restore name/timestamp */
  static	int	qflag;			/* quiet mode */
  static	int	rflag;			/* recursive mode */
  static	int	tflag;			/* test */
  static	int	vflag;			/* verbose mode */
  static	sig_atomic_t print_info = 0;
  #else
  #define		qflag	0
  #define		tflag	0
  #endif
  
  static	int	exit_value = 0;		/* exit value */
  
  static	const char *infile;		/* name of file coming in */
  
  static	void	maybe_err(const char *fmt, ...) __printflike(1, 2) __dead2;
  #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) ||	\
      !defined(NO_XZ_SUPPORT)
  static	void	maybe_errx(const char *fmt, ...) __printflike(1, 2) __dead2;
  #endif
  static	void	maybe_warn(const char *fmt, ...) __printflike(1, 2);
  static	void	maybe_warnx(const char *fmt, ...) __printflike(1, 2);
  static	enum filetype file_gettype(u_char *);
  #ifdef SMALL
  #define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz)
  #endif
  static	off_t	gz_compress(int, int, off_t *, const char *, uint32_t);
  static	off_t	gz_uncompress(int, int, char *, size_t, off_t *, const char *);
  static	off_t	file_compress(char *, char *, size_t);
  static	off_t	file_uncompress(char *, char *, size_t);
  static	void	handle_pathname(char *);
  static	void	handle_file(char *, struct stat *);
  static	void	handle_stdin(void);
  static	void	handle_stdout(void);
  static	void	print_ratio(off_t, off_t, FILE *);
  static	void	print_list(int fd, off_t, const char *, time_t);
  static	void	usage(void) __dead2;
  static	void	display_version(void) __dead2;
  #ifndef SMALL
  static	void	display_license(void);
  #endif
  static	const suffixes_t *check_suffix(char *, int);
  static	ssize_t	read_retry(int, void *, size_t);
  static	ssize_t	write_retry(int, const void *, size_t);
  static void	print_list_out(off_t, off_t, const char*);
  
  #ifdef SMALL
  #define infile_set(f,t) infile_set(f)
  #endif
  static	void	infile_set(const char *newinfile, off_t total);
  
  #ifdef SMALL
  #define unlink_input(f, sb) unlink(f)
  #define check_siginfo() /* nothing */
  #define setup_signals() /* nothing */
  #define infile_newdata(t) /* nothing */
  #else
  static	off_t	infile_total;		/* total expected to read/write */
  static	off_t	infile_current;		/* current read/write */
  
  static	void	check_siginfo(void);
  static	off_t	cat_fd(unsigned char *, size_t, off_t *, int fd);
  static	void	prepend_gzip(char *, int *, char ***);
  static	void	handle_dir(char *);
  static	void	print_verbage(const char *, const char *, off_t, off_t);
  static	void	print_test(const char *, int);
  static	void	copymodes(int fd, const struct stat *, const char *file);
  static	int	check_outfile(const char *outfile);
  static	void	setup_signals(void);
  static	void	infile_newdata(size_t newdata);
  static	void	infile_clear(void);
  #endif
  
  #ifndef NO_BZIP2_SUPPORT
  static	off_t	unbzip2(int, int, char *, size_t, off_t *);
  #endif
  
  #ifndef NO_COMPRESS_SUPPORT
  static	FILE 	*zdopen(int);
  static	off_t	zuncompress(FILE *, FILE *, char *, size_t, off_t *);
  #endif
  
  #ifndef NO_PACK_SUPPORT
  static	off_t	unpack(int, int, char *, size_t, off_t *);
  #endif
  
  #ifndef NO_XZ_SUPPORT
  static	off_t	unxz(int, int, char *, size_t, off_t *);
  static	off_t	unxz_len(int);
  #endif
  
  #ifndef NO_LZ_SUPPORT
  static	off_t	unlz(int, int, char *, size_t, off_t *);
  #endif
  
  #ifdef SMALL
  #define getopt_long(a,b,c,d,e) getopt(a,b,c)
  #else
  static const struct option longopts[] = {
  	{ "stdout",		no_argument,		0,	'c' },
  	{ "to-stdout",		no_argument,		0,	'c' },
  	{ "decompress",		no_argument,		0,	'd' },
  	{ "uncompress",		no_argument,		0,	'd' },
  	{ "force",		no_argument,		0,	'f' },
  	{ "help",		no_argument,		0,	'h' },
  	{ "keep",		no_argument,		0,	'k' },
  	{ "list",		no_argument,		0,	'l' },
  	{ "no-name",		no_argument,		0,	'n' },
  	{ "name",		no_argument,		0,	'N' },
  	{ "quiet",		no_argument,		0,	'q' },
  	{ "recursive",		no_argument,		0,	'r' },
  	{ "suffix",		required_argument,	0,	'S' },
  	{ "test",		no_argument,		0,	't' },
  	{ "verbose",		no_argument,		0,	'v' },
  	{ "version",		no_argument,		0,	'V' },
  	{ "fast",		no_argument,		0,	'1' },
  	{ "best",		no_argument,		0,	'9' },
  	{ "ascii",		no_argument,		0,	'a' },
  	{ "license",		no_argument,		0,	'L' },
  	{ NULL,			no_argument,		0,	0 },
  };
  #endif
  
  int
  main(int argc, char **argv)
  {
  	const char *progname = getprogname();
  #ifndef SMALL
  	char *gzip;
  	int len;
  #endif
  	int ch;
  
  	setup_signals();
  
  #ifndef SMALL
  	if ((gzip = getenv("GZIP")) != NULL)
  		prepend_gzip(gzip, &argc, &argv);
  #endif
  
  	/*
  	 * XXX
  	 * handle being called `gunzip', `zcat' and `gzcat'
  	 */
  	if (strcmp(progname, "gunzip") == 0)
  		dflag = 1;
  	else if (strcmp(progname, "zcat") == 0 ||
  		 strcmp(progname, "gzcat") == 0)
  		dflag = cflag = 1;
  
  #ifdef SMALL
  #define OPT_LIST "123456789cdhlV"
  #else
  #define OPT_LIST "123456789acdfhklLNnqrS:tVv"
  #endif
  
  	while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) {
  		switch (ch) {
  		case '1': case '2': case '3':
  		case '4': case '5': case '6':
  		case '7': case '8': case '9':
  			numflag = ch - '0';
  			break;
  		case 'c':
  			cflag = 1;
  			break;
  		case 'd':
  			dflag = 1;
  			break;
  		case 'l':
  			lflag = 1;
  			dflag = 1;
  			break;
  		case 'V':
  			display_version();
  			/* NOTREACHED */
  #ifndef SMALL
  		case 'a':
  			fprintf(stderr, "%s: option --ascii ignored on this system\n", progname);
  			break;
  		case 'f':
  			fflag = 1;
  			break;
  		case 'k':
  			kflag = 1;
  			break;
  		case 'L':
  			display_license();
  			/* NOT REACHED */
  		case 'N':
  			nflag = 0;
  			Nflag = 1;
  			break;
  		case 'n':
  			nflag = 1;
  			Nflag = 0;
  			break;
  		case 'q':
  			qflag = 1;
  			break;
  		case 'r':
  			rflag = 1;
  			break;
  		case 'S':
  			len = strlen(optarg);
  			if (len != 0) {
  				if (len > SUFFIX_MAXLEN)
  					errx(1, "incorrect suffix: '%s': too long", optarg);
  				suffixes[0].zipped = optarg;
  				suffixes[0].ziplen = len;
  			} else {
  				suffixes[NUM_SUFFIXES - 1].zipped = "";
  				suffixes[NUM_SUFFIXES - 1].ziplen = 0;
  			}
  			break;
  		case 't':
  			cflag = 1;
  			tflag = 1;
  			dflag = 1;
  			break;
  		case 'v':
  			vflag = 1;
  			break;
  #endif
  		default:
  			usage();
  			/* NOTREACHED */
  		}
  	}
  	argv += optind;
  	argc -= optind;
  
  	if (argc == 0) {
  		if (dflag)	/* stdin mode */
  			handle_stdin();
  		else		/* stdout mode */
  			handle_stdout();
  	} else {
  		do {
  			handle_pathname(argv[0]);
  		} while (*++argv);
  	}
  #ifndef SMALL
  	if (qflag == 0 && lflag && argc > 1)
  		print_list(-1, 0, "(totals)", 0);
  #endif
  	exit(exit_value);
  }
  
  /* maybe print a warning */
  void
  maybe_warn(const char *fmt, ...)
  {
  	va_list ap;
  
  	if (qflag == 0) {
  		va_start(ap, fmt);
  		vwarn(fmt, ap);
  		va_end(ap);
  	}
  	if (exit_value == 0)
  		exit_value = 1;
  }
  
  /* ... without an errno. */
  void
  maybe_warnx(const char *fmt, ...)
  {
  	va_list ap;
  
  	if (qflag == 0) {
  		va_start(ap, fmt);
  		vwarnx(fmt, ap);
  		va_end(ap);
  	}
  	if (exit_value == 0)
  		exit_value = 1;
  }
  
  /* maybe print an error */
  void
  maybe_err(const char *fmt, ...)
  {
  	va_list ap;
  
  	if (qflag == 0) {
  		va_start(ap, fmt);
  		vwarn(fmt, ap);
  		va_end(ap);
  	}
  	exit(2);
  }
  
  #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) ||	\
      !defined(NO_XZ_SUPPORT)
  /* ... without an errno. */
  void
  maybe_errx(const char *fmt, ...)
  {
  	va_list ap;
  
  	if (qflag == 0) {
  		va_start(ap, fmt);
  		vwarnx(fmt, ap);
  		va_end(ap);
  	}
  	exit(2);
  }
  #endif
  
  #ifndef SMALL
  /* split up $GZIP and prepend it to the argument list */
  static void
  prepend_gzip(char *gzip, int *argc, char ***argv)
  {
  	char *s, **nargv, **ac;
  	int nenvarg = 0, i;
  
  	/* scan how many arguments there are */
  	for (s = gzip;;) {
  		while (*s == ' ' || *s == '\t')
  			s++;
  		if (*s == 0)
  			goto count_done;
  		nenvarg++;
  		while (*s != ' ' && *s != '\t')
  			if (*s++ == 0)
  				goto count_done;
  	}
  count_done:
  	/* punt early */
  	if (nenvarg == 0)
  		return;
  
  	*argc += nenvarg;
  	ac = *argv;
  
  	nargv = (char **)malloc((*argc + 1) * sizeof(char *));
  	if (nargv == NULL)
  		maybe_err("malloc");
  
  	/* stash this away */
  	*argv = nargv;
  
  	/* copy the program name first */
  	i = 0;
  	nargv[i++] = *(ac++);
  
  	/* take a copy of $GZIP and add it to the array */
  	s = strdup(gzip);
  	if (s == NULL)
  		maybe_err("strdup");
  	for (;;) {
  		/* Skip whitespaces. */
  		while (*s == ' ' || *s == '\t')
  			s++;
  		if (*s == 0)
  			goto copy_done;
  		nargv[i++] = s;
  		/* Find the end of this argument. */
  		while (*s != ' ' && *s != '\t')
  			if (*s++ == 0)
  				/* Argument followed by NUL. */
  				goto copy_done;
  		/* Terminate by overwriting ' ' or '\t' with NUL. */
  		*s++ = 0;
  	}
  copy_done:
  
  	/* copy the original arguments and a NULL */
  	while (*ac)
  		nargv[i++] = *(ac++);
  	nargv[i] = NULL;
  }
  #endif
  
  /* compress input to output. Return bytes read, -1 on error */
  static off_t
  gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime)
  {
  	z_stream z;
  	char *outbufp, *inbufp;
  	off_t in_tot = 0, out_tot = 0;
  	ssize_t in_size;
  	int i, error;
  	uLong crc;
  #ifdef SMALL
  	static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0,
  				 0, 0, 0, 0,
  				 0, OS_CODE };
  #endif
  
  	outbufp = malloc(BUFLEN);
  	inbufp = malloc(BUFLEN);
  	if (outbufp == NULL || inbufp == NULL) {
  		maybe_err("malloc failed");
  		goto out;
  	}
  
  	memset(&z, 0, sizeof z);
  	z.zalloc = Z_NULL;
  	z.zfree = Z_NULL;
  	z.opaque = 0;
  
  #ifdef SMALL
  	memcpy(outbufp, header, sizeof header);
  	i = sizeof header;
  #else
  	if (nflag != 0) {
  		mtime = 0;
  		origname = "";
  	}
  
  	i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s",
  		     GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED,
  		     *origname ? ORIG_NAME : 0,
  		     mtime & 0xff,
  		     (mtime >> 8) & 0xff,
  		     (mtime >> 16) & 0xff,
  		     (mtime >> 24) & 0xff,
  		     numflag == 1 ? 4 : numflag == 9 ? 2 : 0,
  		     OS_CODE, origname);
  	if (i >= BUFLEN)
  		/* this need PATH_MAX > BUFLEN ... */
  		maybe_err("snprintf");
  	if (*origname)
  		i++;
  #endif
  
  	z.next_out = (unsigned char *)outbufp + i;
  	z.avail_out = BUFLEN - i;
  
  	error = deflateInit2(&z, numflag, Z_DEFLATED,
  			     (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY);
  	if (error != Z_OK) {
  		maybe_warnx("deflateInit2 failed");
  		in_tot = -1;
  		goto out;
  	}
  
  	crc = crc32(0L, Z_NULL, 0);
  	for (;;) {
  		if (z.avail_out == 0) {
  			if (write_retry(out, outbufp, BUFLEN) != BUFLEN) {
  				maybe_warn("write");
  				out_tot = -1;
  				goto out;
  			}
  
  			out_tot += BUFLEN;
  			z.next_out = (unsigned char *)outbufp;
  			z.avail_out = BUFLEN;
  		}
  
  		if (z.avail_in == 0) {
  			in_size = read(in, inbufp, BUFLEN);
  			if (in_size < 0) {
  				maybe_warn("read");
  				in_tot = -1;
  				goto out;
  			}
  			if (in_size == 0)
  				break;
  			infile_newdata(in_size);
  
  			crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size);
  			in_tot += in_size;
  			z.next_in = (unsigned char *)inbufp;
  			z.avail_in = in_size;
  		}
  
  		error = deflate(&z, Z_NO_FLUSH);
  		if (error != Z_OK && error != Z_STREAM_END) {
  			maybe_warnx("deflate failed");
  			in_tot = -1;
  			goto out;
  		}
  	}
  
  	/* clean up */
  	for (;;) {
  		size_t len;
  		ssize_t w;
  
  		error = deflate(&z, Z_FINISH);
  		if (error != Z_OK && error != Z_STREAM_END) {
  			maybe_warnx("deflate failed");
  			in_tot = -1;
  			goto out;
  		}
  
  		len = (char *)z.next_out - outbufp;
  
  		w = write_retry(out, outbufp, len);
  		if (w == -1 || (size_t)w != len) {
  			maybe_warn("write");
  			out_tot = -1;
  			goto out;
  		}
  		out_tot += len;
  		z.next_out = (unsigned char *)outbufp;
  		z.avail_out = BUFLEN;
  
  		if (error == Z_STREAM_END)
  			break;
  	}
  
  	if (deflateEnd(&z) != Z_OK) {
  		maybe_warnx("deflateEnd failed");
  		in_tot = -1;
  		goto out;
  	}
  
  	i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c",
  		 (int)crc & 0xff,
  		 (int)(crc >> 8) & 0xff,
  		 (int)(crc >> 16) & 0xff,
  		 (int)(crc >> 24) & 0xff,
  		 (int)in_tot & 0xff,
  		 (int)(in_tot >> 8) & 0xff,
  		 (int)(in_tot >> 16) & 0xff,
  		 (int)(in_tot >> 24) & 0xff);
  	if (i != 8)
  		maybe_err("snprintf");
  	if (write_retry(out, outbufp, i) != i) {
  		maybe_warn("write");
  		in_tot = -1;
  	} else
  		out_tot += i;
  
  out:
  	if (inbufp != NULL)
  		free(inbufp);
  	if (outbufp != NULL)
  		free(outbufp);
  	if (gsizep)
  		*gsizep = out_tot;
  	return in_tot;
  }
  
  /*
   * uncompress input to output then close the input.  return the
   * uncompressed size written, and put the compressed sized read
   * into `*gsizep'.
   */
  static off_t
  gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
  	      const char *filename)
  {
  	z_stream z;
  	char *outbufp, *inbufp;
  	off_t out_tot = -1, in_tot = 0;
  	uint32_t out_sub_tot = 0;
  	enum {
  		GZSTATE_MAGIC0,
  		GZSTATE_MAGIC1,
  		GZSTATE_METHOD,
  		GZSTATE_FLAGS,
  		GZSTATE_SKIPPING,
  		GZSTATE_EXTRA,
  		GZSTATE_EXTRA2,
  		GZSTATE_EXTRA3,
  		GZSTATE_ORIGNAME,
  		GZSTATE_COMMENT,
  		GZSTATE_HEAD_CRC1,
  		GZSTATE_HEAD_CRC2,
  		GZSTATE_INIT,
  		GZSTATE_READ,
  		GZSTATE_CRC,
  		GZSTATE_LEN,
  	} state = GZSTATE_MAGIC0;
  	int flags = 0, skip_count = 0;
  	int error = Z_STREAM_ERROR, done_reading = 0;
  	uLong crc = 0;
  	ssize_t wr;
  	int needmore = 0;
  
  #define ADVANCE()       { z.next_in++; z.avail_in--; }
  
  	if ((outbufp = malloc(BUFLEN)) == NULL) {
  		maybe_err("malloc failed");
  		goto out2;
  	}
  	if ((inbufp = malloc(BUFLEN)) == NULL) {
  		maybe_err("malloc failed");
  		goto out1;
  	}
  
  	memset(&z, 0, sizeof z);
  	z.avail_in = prelen;
  	z.next_in = (unsigned char *)pre;
  	z.avail_out = BUFLEN;
  	z.next_out = (unsigned char *)outbufp;
  	z.zalloc = NULL;
  	z.zfree = NULL;
  	z.opaque = 0;
  
  	in_tot = prelen;
  	out_tot = 0;
  
  	for (;;) {
  		check_siginfo();
  		if ((z.avail_in == 0 || needmore) && done_reading == 0) {
  			ssize_t in_size;
  
  			if (z.avail_in > 0) {
  				memmove(inbufp, z.next_in, z.avail_in);
  			}
  			z.next_in = (unsigned char *)inbufp;
  			in_size = read(in, z.next_in + z.avail_in,
  			    BUFLEN - z.avail_in);
  
  			if (in_size == -1) {
  				maybe_warn("failed to read stdin");
  				goto stop_and_fail;
  			} else if (in_size == 0) {
  				done_reading = 1;
  			}
  			infile_newdata(in_size);
  
  			z.avail_in += in_size;
  			needmore = 0;
  
  			in_tot += in_size;
  		}
  		if (z.avail_in == 0) {
  			if (done_reading && state != GZSTATE_MAGIC0) {
  				maybe_warnx("%s: unexpected end of file",
  					    filename);
  				goto stop_and_fail;
  			}
  			goto stop;
  		}
  		switch (state) {
  		case GZSTATE_MAGIC0:
  			if (*z.next_in != GZIP_MAGIC0) {
  				if (in_tot > 0) {
  					maybe_warnx("%s: trailing garbage "
  						    "ignored", filename);
  					exit_value = 2;
  					goto stop;
  				}
  				maybe_warnx("input not gziped (MAGIC0)");
  				goto stop_and_fail;
  			}
  			ADVANCE();
  			state++;
  			out_sub_tot = 0;
  			crc = crc32(0L, Z_NULL, 0);
  			break;
  
  		case GZSTATE_MAGIC1:
  			if (*z.next_in != GZIP_MAGIC1 &&
  			    *z.next_in != GZIP_OMAGIC1) {
  				maybe_warnx("input not gziped (MAGIC1)");
  				goto stop_and_fail;
  			}
  			ADVANCE();
  			state++;
  			break;
  
  		case GZSTATE_METHOD:
  			if (*z.next_in != Z_DEFLATED) {
  				maybe_warnx("unknown compression method");
  				goto stop_and_fail;
  			}
  			ADVANCE();
  			state++;
  			break;
  
  		case GZSTATE_FLAGS:
  			flags = *z.next_in;
  			ADVANCE();
  			skip_count = 6;
  			state++;
  			break;
  
  		case GZSTATE_SKIPPING:
  			if (skip_count > 0) {
  				skip_count--;
  				ADVANCE();
  			} else
  				state++;
  			break;
  
  		case GZSTATE_EXTRA:
  			if ((flags & EXTRA_FIELD) == 0) {
  				state = GZSTATE_ORIGNAME;
  				break;
  			}
  			skip_count = *z.next_in;
  			ADVANCE();
  			state++;
  			break;
  
  		case GZSTATE_EXTRA2:
  			skip_count |= ((*z.next_in) << 8);
  			ADVANCE();
  			state++;
  			break;
  
  		case GZSTATE_EXTRA3:
  			if (skip_count > 0) {
  				skip_count--;
  				ADVANCE();
  			} else
  				state++;
  			break;
  
  		case GZSTATE_ORIGNAME:
  			if ((flags & ORIG_NAME) == 0) {
  				state++;
  				break;
  			}
  			if (*z.next_in == 0)
  				state++;
  			ADVANCE();
  			break;
  
  		case GZSTATE_COMMENT:
  			if ((flags & COMMENT) == 0) {
  				state++;
  				break;
  			}
  			if (*z.next_in == 0)
  				state++;
  			ADVANCE();
  			break;
  
  		case GZSTATE_HEAD_CRC1:
  			if (flags & HEAD_CRC)
  				skip_count = 2;
  			else
  				skip_count = 0;
  			state++;
  			break;
  
  		case GZSTATE_HEAD_CRC2:
  			if (skip_count > 0) {
  				skip_count--;
  				ADVANCE();
  			} else
  				state++;
  			break;
  
  		case GZSTATE_INIT:
  			if (inflateInit2(&z, -MAX_WBITS) != Z_OK) {
  				maybe_warnx("failed to inflateInit");
  				goto stop_and_fail;
  			}
  			state++;
  			break;
  
  		case GZSTATE_READ:
  			error = inflate(&z, Z_FINISH);
  			switch (error) {
  			/* Z_BUF_ERROR goes with Z_FINISH... */
  			case Z_BUF_ERROR:
  				if (z.avail_out > 0 && !done_reading)
  					continue;
  
  			case Z_STREAM_END:
  			case Z_OK:
  				break;
  
  			case Z_NEED_DICT:
  				maybe_warnx("Z_NEED_DICT error");
  				goto stop_and_fail;
  			case Z_DATA_ERROR:
  				maybe_warnx("data stream error");
  				goto stop_and_fail;
  			case Z_STREAM_ERROR:
  				maybe_warnx("internal stream error");
  				goto stop_and_fail;
  			case Z_MEM_ERROR:
  				maybe_warnx("memory allocation error");
  				goto stop_and_fail;
  
  			default:
  				maybe_warn("unknown error from inflate(): %d",
  				    error);
  			}
  			wr = BUFLEN - z.avail_out;
  
  			if (wr != 0) {
  				crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr);
  				if (
  #ifndef SMALL
  				    /* don't write anything with -t */
  				    tflag == 0 &&
  #endif
  				    write_retry(out, outbufp, wr) != wr) {
  					maybe_warn("error writing to output");
  					goto stop_and_fail;
  				}
  
  				out_tot += wr;
  				out_sub_tot += wr;
  			}
  
  			if (error == Z_STREAM_END) {
  				inflateEnd(&z);
  				state++;
  			}
  
  			z.next_out = (unsigned char *)outbufp;
  			z.avail_out = BUFLEN;
  
  			break;
  		case GZSTATE_CRC:
  			{
  				uLong origcrc;
  
  				if (z.avail_in < 4) {
  					if (!done_reading) {
  						needmore = 1;
  						continue;
  					}
  					maybe_warnx("truncated input");
  					goto stop_and_fail;
  				}
  				origcrc = le32dec(&z.next_in[0]);
  				if (origcrc != crc) {
  					maybe_warnx("invalid compressed"
  					     " data--crc error");
  					goto stop_and_fail;
  				}
  			}
  
  			z.avail_in -= 4;
  			z.next_in += 4;
  
  			if (!z.avail_in && done_reading) {
  				goto stop;
  			}
  			state++;
  			break;
  		case GZSTATE_LEN:
  			{
  				uLong origlen;
  
  				if (z.avail_in < 4) {
  					if (!done_reading) {
  						needmore = 1;
  						continue;
  					}
  					maybe_warnx("truncated input");
  					goto stop_and_fail;
  				}
  				origlen = le32dec(&z.next_in[0]);
  
  				if (origlen != out_sub_tot) {
  					maybe_warnx("invalid compressed"
  					     " data--length error");
  					goto stop_and_fail;
  				}
  			}
  				
  			z.avail_in -= 4;
  			z.next_in += 4;
  
  			if (error < 0) {
  				maybe_warnx("decompression error");
  				goto stop_and_fail;
  			}
  			state = GZSTATE_MAGIC0;
  			break;
  		}
  		continue;
  stop_and_fail:
  		out_tot = -1;
  stop:
  		break;
  	}
  	if (state > GZSTATE_INIT)
  		inflateEnd(&z);
  
  	free(inbufp);
  out1:
  	free(outbufp);
  out2:
  	if (gsizep)
  		*gsizep = in_tot;
  	return (out_tot);
  }
  
  #ifndef SMALL
  /*
   * set the owner, mode, flags & utimes using the given file descriptor.
   * file is only used in possible warning messages.
   */
  static void
  copymodes(int fd, const struct stat *sbp, const char *file)
  {
  	struct timespec times[2];
  	struct stat sb;
  
  	/*
  	 * If we have no info on the input, give this file some
  	 * default values and return..
  	 */
  	if (sbp == NULL) {
  		mode_t mask = umask(022);
  
  		(void)fchmod(fd, DEFFILEMODE & ~mask);
  		(void)umask(mask);
  		return;
  	}
  	sb = *sbp;
  
  	/* if the chown fails, remove set-id bits as-per compress(1) */
  	if (fchown(fd, sb.st_uid, sb.st_gid) < 0) {
  		if (errno != EPERM)
  			maybe_warn("couldn't fchown: %s", file);
  		sb.st_mode &= ~(S_ISUID|S_ISGID);
  	}
  
  	/* we only allow set-id and the 9 normal permission bits */
  	sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
  	if (fchmod(fd, sb.st_mode) < 0)
  		maybe_warn("couldn't fchmod: %s", file);
  
  	times[0] = sb.st_atim;
  	times[1] = sb.st_mtim;
  	if (futimens(fd, times) < 0)
  		maybe_warn("couldn't futimens: %s", file);
  
  #if 0
  	/* only try flags if they exist already */
          if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0)
  		maybe_warn("couldn't fchflags: %s", file);
  #endif
  }
  #endif
  
  /* what sort of file is this? */
  static enum filetype
  file_gettype(u_char *buf)
  {
  
  	if (buf[0] == GZIP_MAGIC0 &&
  	    (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
  		return FT_GZIP;
  	else
  #ifndef NO_BZIP2_SUPPORT
  	if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
  	    buf[3] >= '0' && buf[3] <= '9')
  		return FT_BZIP2;
  	else
  #endif
  #ifndef NO_COMPRESS_SUPPORT
  	if (memcmp(buf, Z_MAGIC, 2) == 0)
  		return FT_Z;
  	else
  #endif
  #ifndef NO_PACK_SUPPORT
  	if (memcmp(buf, PACK_MAGIC, 2) == 0)
  		return FT_PACK;
  	else
  #endif
  #ifndef NO_XZ_SUPPORT
  	if (memcmp(buf, XZ_MAGIC, 4) == 0)	/* XXX: We only have 4 bytes */
  		return FT_XZ;
  	else
  #endif
  #ifndef NO_LZ_SUPPORT
  	if (memcmp(buf, LZ_MAGIC, 4) == 0)
  		return FT_LZ;
  	else
  #endif
  		return FT_UNKNOWN;
  }
  
  #ifndef SMALL
  /* check the outfile is OK. */
  static int
  check_outfile(const char *outfile)
  {
  	struct stat sb;
  	int ok = 1;
  
  	if (lflag == 0 && stat(outfile, &sb) == 0) {
  		if (fflag)
  			unlink(outfile);
  		else if (isatty(STDIN_FILENO)) {
  			char ans[10] = { 'n', '\0' };	/* default */
  
  			fprintf(stderr, "%s already exists -- do you wish to "
  					"overwrite (y or n)? " , outfile);
  			(void)fgets(ans, sizeof(ans) - 1, stdin);
  			if (ans[0] != 'y' && ans[0] != 'Y') {
  				fprintf(stderr, "\tnot overwriting\n");
  				ok = 0;
  			} else
  				unlink(outfile);
  		} else {
  			maybe_warnx("%s already exists -- skipping", outfile);
  			ok = 0;
  		}
  	}
  	return ok;
  }
  
  static void
  unlink_input(const char *file, const struct stat *sb)
  {
  	struct stat nsb;
  
  	if (kflag)
  		return;
  	if (stat(file, &nsb) != 0)
  		/* Must be gone already */
  		return;
  	if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
  		/* Definitely a different file */
  		return;
  	unlink(file);
  }
  
  static void
  got_sigint(int signo __attribute__((unused)))
  {
  
  	if (remove_file != NULL)
  		unlink(remove_file);
  	_exit(2);
  }
  
  static void
  got_siginfo(int signo __attribute__((unused)))
  {
  
  	print_info = 1;
  }
  
  static void
  setup_signals(void)
  {
  
  	signal(SIGUSR1, got_siginfo);
  	signal(SIGINT, got_sigint);
  }
  
  static	void
  infile_newdata(size_t newdata)
  {
  
  	infile_current += newdata;
  }
  #endif
  
  static	void
  infile_set(const char *newinfile, off_t total)
  {
  
  	if (newinfile)
  		infile = newinfile;
  #ifndef SMALL
  	infile_total = total;
  #endif
  }
  
  static	void
  infile_clear(void)
  {
  
  	infile = NULL;
  #ifndef SMALL
  	infile_total = infile_current = 0;
  #endif
  }
  
  static const suffixes_t *
  check_suffix(char *file, int xlate)
  {
  	const suffixes_t *s;
  	int len = strlen(file);
  	char *sp;
  
  	for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
  		/* if it doesn't fit in "a.suf", don't bother */
  		if (s->ziplen >= len)
  			continue;
  		sp = file + len - s->ziplen;
  		if (strcmp(s->zipped, sp) != 0)
  			continue;
  		if (xlate)
  			strcpy(sp, s->normal);
  		return s;
  	}
  	return NULL;
  }
  
  /*
   * compress the given file: create a corresponding .gz file and remove the
   * original.
   */
  static off_t
  file_compress(char *file, char *outfile, size_t outsize)
  {
  	int in;
  	int out;
  	off_t size, in_size;
  #ifndef SMALL
  	struct stat isb, osb;
  	const suffixes_t *suff;
  #endif
  
  	in = open(file, O_RDONLY);
  	if (in == -1) {
  		maybe_warn("can't open %s", file);
  		return (-1);
  	}
  
  #ifndef SMALL
  	if (fstat(in, &isb) != 0) {
  		maybe_warn("couldn't stat: %s", file);
  		close(in);
  		return (-1);
  	}
  #endif
  
  #ifndef SMALL
  	if (fstat(in, &isb) != 0) {
  		close(in);
  		maybe_warn("can't stat %s", file);
  		return -1;
  	}
  	infile_set(file, isb.st_size);
  #endif
  
  	if (cflag == 0) {
  #ifndef SMALL
  		if (isb.st_nlink > 1 && fflag == 0) {
  			maybe_warnx("%s has %ju other link%s -- "
  				    "skipping", file,
  				    (uintmax_t)isb.st_nlink - 1,
  				    isb.st_nlink == 1 ? "" : "s");
  			close(in);
  			return -1;
  		}
  
  		if (fflag == 0 && (suff = check_suffix(file, 0)) &&
  		    suff->zipped[0] != 0) {
  			maybe_warnx("%s already has %s suffix -- unchanged",
  			    file, suff->zipped);
  			close(in);
  			return (-1);
  		}
  #endif
  
  		/* Add (usually) .gz to filename */
  		if ((size_t)snprintf(outfile, outsize, "%s%s",
  		    file, suffixes[0].zipped) >= outsize)
  			memcpy(outfile + outsize - suffixes[0].ziplen - 1,
  			    suffixes[0].zipped, suffixes[0].ziplen + 1);
  
  #ifndef SMALL
  		if (check_outfile(outfile) == 0) {
  			close(in);
  			return (-1);
  		}
  #endif
  	}
  
  	if (cflag == 0) {
  		out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
  		if (out == -1) {
  			maybe_warn("could not create output: %s", outfile);
  			fclose(stdin);
  			return (-1);
  		}
  #ifndef SMALL
  		remove_file = outfile;
  #endif
  	} else
  		out = STDOUT_FILENO;
  
  	in_size = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
  
  	(void)close(in);
  
  	/*
  	 * If there was an error, in_size will be -1.
  	 * If we compressed to stdout, just return the size.
  	 * Otherwise stat the file and check it is the correct size.
  	 * We only blow away the file if we can stat the output and it
  	 * has the expected size.
  	 */
  	if (cflag != 0)
  		return in_size == -1 ? -1 : size;
  
  #ifndef SMALL
  	if (fstat(out, &osb) != 0) {
  		maybe_warn("couldn't stat: %s", outfile);
  		goto bad_outfile;
  	}
  
  	if (osb.st_size != size) {
  		maybe_warnx("output file: %s wrong size (%ju != %ju), deleting",
  		    outfile, (uintmax_t)osb.st_size, (uintmax_t)size);
  		goto bad_outfile;
  	}
  
  	copymodes(out, &isb, outfile);
  	remove_file = NULL;
  #endif
  	if (close(out) == -1)
  		maybe_warn("couldn't close output");
  
  	/* output is good, ok to delete input */
  	unlink_input(file, &isb);
  	return (size);
  
  #ifndef SMALL
      bad_outfile:
  	if (close(out) == -1)
  		maybe_warn("couldn't close output");
  
  	maybe_warnx("leaving original %s", file);
  	unlink(outfile);
  	return (size);
  #endif
  }
  
  /* uncompress the given file and remove the original */
  static off_t
  file_uncompress(char *file, char *outfile, size_t outsize)
  {
  	struct stat isb, osb;
  	off_t size;
  	ssize_t rbytes;
  	unsigned char fourbytes[4];
  	enum filetype method;
  	int fd, ofd, zfd = -1;
  	int error;
  	size_t in_size;
  #ifndef SMALL
  	ssize_t rv;
  	time_t timestamp = 0;
  	char name[PATH_MAX + 1];
  #endif
  
  	/* gather the old name info */
  
  	fd = open(file, O_RDONLY);
  	if (fd < 0) {
  		maybe_warn("can't open %s", file);
  		goto lose;
  	}
  	if (fstat(fd, &isb) != 0) {
  		maybe_warn("can't stat %s", file);
  		goto lose;
  	}
  	if (S_ISREG(isb.st_mode))
  		in_size = isb.st_size;
  	else
  		in_size = 0;
  	infile_set(file, in_size);
  
  	strlcpy(outfile, file, outsize);
  	if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
  		maybe_warnx("%s: unknown suffix -- ignored", file);
  		goto lose;
  	}
  
  	rbytes = read(fd, fourbytes, sizeof fourbytes);
  	if (rbytes != sizeof fourbytes) {
  		/* we don't want to fail here. */
  #ifndef SMALL
  		if (fflag)
  			goto lose;
  #endif
  		if (rbytes == -1)
  			maybe_warn("can't read %s", file);
  		else
  			goto unexpected_EOF;
  		goto lose;
  	}
  	infile_newdata(rbytes);
  
  	method = file_gettype(fourbytes);
  #ifndef SMALL
  	if (fflag == 0 && method == FT_UNKNOWN) {
  		maybe_warnx("%s: not in gzip format", file);
  		goto lose;
  	}
  
  #endif
  
  #ifndef SMALL
  	if (method == FT_GZIP && Nflag) {
  		unsigned char ts[4];	/* timestamp */
  
  		rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP);
  		if (rv >= 0 && rv < (ssize_t)(sizeof ts))
  			goto unexpected_EOF;
  		if (rv == -1) {
  			if (!fflag)
  				maybe_warn("can't read %s", file);
  			goto lose;
  		}
  		infile_newdata(rv);
  		timestamp = le32dec(&ts[0]);
  
  		if (fourbytes[3] & ORIG_NAME) {
  			rbytes = pread(fd, name, sizeof(name) - 1, GZIP_ORIGNAME);
  			if (rbytes < 0) {
  				maybe_warn("can't read %s", file);
  				goto lose;
  			}
  			if (name[0] != '\0') {
  				char *dp, *nf;
  
  				/* Make sure that name is NUL-terminated */
  				name[rbytes] = '\0';
  
  				/* strip saved directory name */
  				nf = strrchr(name, '/');
  				if (nf == NULL)
  					nf = name;
  				else
  					nf++;
  
  				/* preserve original directory name */
  				dp = strrchr(file, '/');
  				if (dp == NULL)
  					dp = file;
  				else
  					dp++;
  				snprintf(outfile, outsize, "%.*s%.*s",
  						(int) (dp - file),
  						file, (int) rbytes, nf);
  			}
  		}
  	}
  #endif
  	lseek(fd, 0, SEEK_SET);
  
  	if (cflag == 0 || lflag) {
  #ifndef SMALL
  		if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
  			maybe_warnx("%s has %ju other links -- skipping",
  			    file, (uintmax_t)isb.st_nlink - 1);
  			goto lose;
  		}
  		if (nflag == 0 && timestamp)
  			isb.st_mtime = timestamp;
  		if (check_outfile(outfile) == 0)
  			goto lose;
  #endif
  	}
  
  	if (cflag)
  		zfd = STDOUT_FILENO;
  	else if (lflag)
  		zfd = -1;
  	else {
  		zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
  		if (zfd == STDOUT_FILENO) {
  			/* We won't close STDOUT_FILENO later... */
  			zfd = dup(zfd);
  			close(STDOUT_FILENO);
  		}
  		if (zfd == -1) {
  			maybe_warn("can't open %s", outfile);
  			goto lose;
  		}
  		remove_file = outfile;
  	}
  
  	switch (method) {
  #ifndef NO_BZIP2_SUPPORT
  	case FT_BZIP2:
  		/* XXX */
  		if (lflag) {
  			maybe_warnx("no -l with bzip2 files");
  			goto lose;
  		}
  
  		size = unbzip2(fd, zfd, NULL, 0, NULL);
  		break;
  #endif
  
  #ifndef NO_COMPRESS_SUPPORT
  	case FT_Z: {
  		FILE *in, *out;
  
  		/* XXX */
  		if (lflag) {
  			maybe_warnx("no -l with Lempel-Ziv files");
  			goto lose;
  		}
  
  		if ((in = zdopen(fd)) == NULL) {
  			maybe_warn("zdopen for read: %s", file);
  			goto lose;
  		}
  
  		out = fdopen(dup(zfd), "w");
  		if (out == NULL) {
  			maybe_warn("fdopen for write: %s", outfile);
  			fclose(in);
  			goto lose;
  		}
  
  		size = zuncompress(in, out, NULL, 0, NULL);
  		/* need to fclose() if ferror() is true... */
  		error = ferror(in);
  		if (error | fclose(in)) {
  			if (error)
  				maybe_warn("failed infile");
  			else
  				maybe_warn("failed infile fclose");
  			if (cflag == 0)
  				unlink(outfile);
  			(void)fclose(out);
  			goto lose;
  		}
  		if (fclose(out) != 0) {
  			maybe_warn("failed outfile fclose");
  			if (cflag == 0)
  				unlink(outfile);
  			goto lose;
  		}
  		break;
  	}
  #endif
  
  #ifndef NO_PACK_SUPPORT
  	case FT_PACK:
  		if (lflag) {
  			maybe_warnx("no -l with packed files");
  			goto lose;
  		}
  
  		size = unpack(fd, zfd, NULL, 0, NULL);
  		break;
  #endif
  
  #ifndef NO_XZ_SUPPORT
  	case FT_XZ:
  		if (lflag) {
  			size = unxz_len(fd);
  			print_list_out(in_size, size, file);
  			return -1;
  		}
  		size = unxz(fd, zfd, NULL, 0, NULL);
  		break;
  #endif
  
  #ifndef NO_LZ_SUPPORT
  	case FT_LZ:
  		if (lflag) {
  			maybe_warnx("no -l with lzip files");
  			goto lose;
  		}
  		size = unlz(fd, zfd, NULL, 0, NULL);
  		break;
  #endif
  #ifndef SMALL
  	case FT_UNKNOWN:
  		if (lflag) {
  			maybe_warnx("no -l for unknown filetypes");
  			goto lose;
  		}
  		size = cat_fd(NULL, 0, NULL, fd);
  		break;
  #endif
  	default:
  		if (lflag) {
  			print_list(fd, in_size, outfile, isb.st_mtime);
  			close(fd);
  			return -1;	/* XXX */
  		}
  
  		size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
  		break;
  	}
  
  	if (close(fd) != 0)
  		maybe_warn("couldn't close input");
  	if (zfd != STDOUT_FILENO && close(zfd) != 0)
  		maybe_warn("couldn't close output");
  
  	if (size == -1) {
  		if (cflag == 0)
  			unlink(outfile);
  		maybe_warnx("%s: uncompress failed", file);
  		return -1;
  	}
  
  	/* if testing, or we uncompressed to stdout, this is all we need */
  #ifndef SMALL
  	if (tflag)
  		return size;
  #endif
  	/* if we are uncompressing to stdin, don't remove the file. */
  	if (cflag)
  		return size;
  
  	/*
  	 * if we create a file...
  	 */
  	/*
  	 * if we can't stat the file don't remove the file.
  	 */
  
  	ofd = open(outfile, O_RDWR, 0);
  	if (ofd == -1) {
  		maybe_warn("couldn't open (leaving original): %s",
  			   outfile);
  		return -1;
  	}
  	if (fstat(ofd, &osb) != 0) {
  		maybe_warn("couldn't stat (leaving original): %s",
  			   outfile);
  		close(ofd);
  		return -1;
  	}
  	if (osb.st_size != size) {
  		maybe_warnx("stat gave different size: %ju != %ju (leaving original)",
  		    (uintmax_t)size, (uintmax_t)osb.st_size);
  		close(ofd);
  		unlink(outfile);
  		return -1;
  	}
  #ifndef SMALL
  	copymodes(ofd, &isb, outfile);
  	remove_file = NULL;
  #endif
  	close(ofd);
  	unlink_input(file, &isb);
  	return size;
  
      unexpected_EOF:
  	maybe_warnx("%s: unexpected end of file", file);
      lose:
  	if (fd != -1)
  		close(fd);
  	if (zfd != -1 && zfd != STDOUT_FILENO)
  		close(zfd);
  	return -1;
  }
  
  #ifndef SMALL
  static void
  check_siginfo(void)
  {
  	if (print_info == 0)
  		return;
  	if (infile) {
  		if (infile_total) {
  			int pcent = (int)((100.0 * infile_current) / infile_total);
  
  			fprintf(stderr, "%s: done %llu/%llu bytes %d%%\n",
  				infile, (unsigned long long)infile_current,
  				(unsigned long long)infile_total, pcent);
  		} else
  			fprintf(stderr, "%s: done %llu bytes\n",
  				infile, (unsigned long long)infile_current);
  	}
  	print_info = 0;
  }
  
  static off_t
  cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd)
  {
  	char buf[BUFLEN];
  	off_t in_tot;
  	ssize_t w;
  
  	in_tot = count;
  	w = write_retry(STDOUT_FILENO, prepend, count);
  	if (w == -1 || (size_t)w != count) {
  		maybe_warn("write to stdout");
  		return -1;
  	}
  	for (;;) {
  		ssize_t rv;
  
  		rv = read(fd, buf, sizeof buf);
  		if (rv == 0)
  			break;
  		if (rv < 0) {
  			maybe_warn("read from fd %d", fd);
  			break;
  		}
  		infile_newdata(rv);
  
  		if (write_retry(STDOUT_FILENO, buf, rv) != rv) {
  			maybe_warn("write to stdout");
  			break;
  		}
  		in_tot += rv;
  	}
  
  	if (gsizep)
  		*gsizep = in_tot;
  	return (in_tot);
  }
  #endif
  
  static void
  handle_stdin(void)
  {
  	struct stat isb;
  	unsigned char fourbytes[4];
  	size_t in_size;
  	off_t usize, gsize;
  	enum filetype method;
  	ssize_t bytes_read;
  #ifndef NO_COMPRESS_SUPPORT
  	FILE *in;
  #endif
  
  #ifndef SMALL
  	if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
  		maybe_warnx("standard input is a terminal -- ignoring");
  		goto out;
  	}
  #endif
  
  	if (fstat(STDIN_FILENO, &isb) < 0) {
  		maybe_warn("fstat");
  		goto out;
  	}
  	if (S_ISREG(isb.st_mode))
  		in_size = isb.st_size;
  	else
  		in_size = 0;
  	infile_set("(stdin)", in_size);
  
  	if (lflag) {
  		print_list(STDIN_FILENO, in_size, infile, isb.st_mtime);
  		goto out;
  	}
  
  	bytes_read = read_retry(STDIN_FILENO, fourbytes, sizeof fourbytes);
  	if (bytes_read == -1) {
  		maybe_warn("can't read stdin");
  		goto out;
  	} else if (bytes_read != sizeof(fourbytes)) {
  		maybe_warnx("(stdin): unexpected end of file");
  		goto out;
  	}
  
  	method = file_gettype(fourbytes);
  	switch (method) {
  	default:
  #ifndef SMALL
  		if (fflag == 0) {
  			maybe_warnx("unknown compression format");
  			goto out;
  		}
  		usize = cat_fd(fourbytes, sizeof fourbytes, &gsize, STDIN_FILENO);
  		break;
  #endif
  	case FT_GZIP:
  		usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
  			      (char *)fourbytes, sizeof fourbytes, &gsize, "(stdin)");
  		break;
  #ifndef NO_BZIP2_SUPPORT
  	case FT_BZIP2:
  		usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
  				(char *)fourbytes, sizeof fourbytes, &gsize);
  		break;
  #endif
  #ifndef NO_COMPRESS_SUPPORT
  	case FT_Z:
  		if ((in = zdopen(STDIN_FILENO)) == NULL) {
  			maybe_warnx("zopen of stdin");
  			goto out;
  		}
  
  		usize = zuncompress(in, stdout, (char *)fourbytes,
  		    sizeof fourbytes, &gsize);
  		fclose(in);
  		break;
  #endif
  #ifndef NO_PACK_SUPPORT
  	case FT_PACK:
  		usize = unpack(STDIN_FILENO, STDOUT_FILENO,
  			       (char *)fourbytes, sizeof fourbytes, &gsize);
  		break;
  #endif
  #ifndef NO_XZ_SUPPORT
  	case FT_XZ:
  		usize = unxz(STDIN_FILENO, STDOUT_FILENO,
  			     (char *)fourbytes, sizeof fourbytes, &gsize);
  		break;
  #endif
  #ifndef NO_LZ_SUPPORT
  	case FT_LZ:
  		usize = unlz(STDIN_FILENO, STDOUT_FILENO,
  			     (char *)fourbytes, sizeof fourbytes, &gsize);
  		break;
  #endif
  	}
  
  #ifndef SMALL
          if (vflag && !tflag && usize != -1 && gsize != -1)
  		print_verbage(NULL, NULL, usize, gsize);
  	if (vflag && tflag)
  		print_test("(stdin)", usize != -1);
  #else
  	(void)&usize;
  #endif
  
  out:
  	infile_clear();
  }
  
  static void
  handle_stdout(void)
  {
  	off_t gsize;
  #ifndef SMALL
  	off_t usize;
  	struct stat sb;
  	time_t systime;
  	uint32_t mtime;
  	int ret;
  
  	infile_set("(stdout)", 0);
  
  	if (fflag == 0 && isatty(STDOUT_FILENO)) {
  		maybe_warnx("standard output is a terminal -- ignoring");
  		return;
  	}
  
  	/* If stdin is a file use its mtime, otherwise use current time */
  	ret = fstat(STDIN_FILENO, &sb);
  	if (ret < 0) {
  		maybe_warn("Can't stat stdin");
  		return;
  	}
  
  	if (S_ISREG(sb.st_mode)) {
  		infile_set("(stdout)", sb.st_size);
  		mtime = (uint32_t)sb.st_mtime;
  	} else {
  		systime = time(NULL);
  		if (systime == -1) {
  			maybe_warn("time");
  			return;
  		}
  		mtime = (uint32_t)systime;
  	}
  	 		
  	usize =
  #endif
  		gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime);
  #ifndef SMALL
          if (vflag && !tflag && usize != -1 && gsize != -1)
  		print_verbage(NULL, NULL, usize, gsize);
  #endif
  }
  
  /* do what is asked for, for the path name */
  static void
  handle_pathname(char *path)
  {
  	char *opath = path, *s = NULL;
  	ssize_t len;
  	int slen;
  	struct stat sb;
  
  	/* check for stdout/stdin */
  	if (path[0] == '-' && path[1] == '\0') {
  		if (dflag)
  			handle_stdin();
  		else
  			handle_stdout();
  		return;
  	}
  
  retry:
  	if (stat(path, &sb) != 0 || (fflag == 0 && cflag == 0 &&
  	    lstat(path, &sb) != 0)) {
  		/* lets try <path>.gz if we're decompressing */
  		if (dflag && s == NULL && errno == ENOENT) {
  			len = strlen(path);
  			slen = suffixes[0].ziplen;
  			s = malloc(len + slen + 1);
  			if (s == NULL)
  				maybe_err("malloc");
  			memcpy(s, path, len);
  			memcpy(s + len, suffixes[0].zipped, slen + 1);
  			path = s;
  			goto retry;
  		}
  		maybe_warn("can't stat: %s", opath);
  		goto out;
  	}
  
  	if (S_ISDIR(sb.st_mode)) {
  #ifndef SMALL
  		if (rflag)
  			handle_dir(path);
  		else
  #endif
  			maybe_warnx("%s is a directory", path);
  		goto out;
  	}
  
  	if (S_ISREG(sb.st_mode))
  		handle_file(path, &sb);
  	else
  		maybe_warnx("%s is not a regular file", path);
  
  out:
  	if (s)
  		free(s);
  }
  
  /* compress/decompress a file */
  static void
  handle_file(char *file, struct stat *sbp)
  {
  	off_t usize, gsize;
  	char	outfile[PATH_MAX];
  
  	infile_set(file, sbp->st_size);
  	if (dflag) {
  		usize = file_uncompress(file, outfile, sizeof(outfile));
  #ifndef SMALL
  		if (vflag && tflag)
  			print_test(file, usize != -1);
  #endif
  		if (usize == -1)
  			return;
  		gsize = sbp->st_size;
  	} else {
  		gsize = file_compress(file, outfile, sizeof(outfile));
  		if (gsize == -1)
  			return;
  		usize = sbp->st_size;
  	}
  	infile_clear();
  
  #ifndef SMALL
  	if (vflag && !tflag)
  		print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
  #endif
  }
  
  #ifndef SMALL
  /* this is used with -r to recursively descend directories */
  static void
  handle_dir(char *dir)
  {
  	char *path_argv[2];
  	FTS *fts;
  	FTSENT *entry;
  
  	path_argv[0] = dir;
  	path_argv[1] = 0;
  	fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
  	if (fts == NULL) {
  		warn("couldn't fts_open %s", dir);
  		return;
  	}
  
  	while (errno = 0, (entry = fts_read(fts))) {
  		switch(entry->fts_info) {
  		case FTS_D:
  		case FTS_DP:
  			continue;
  
  		case FTS_DNR:
  		case FTS_ERR:
  		case FTS_NS:
  			maybe_warn("%s", entry->fts_path);
  			continue;
  		case FTS_F:
  			handle_file(entry->fts_path, entry->fts_statp);
  		}
  	}
  	if (errno != 0)
  		warn("error with fts_read %s", dir);
  	(void)fts_close(fts);
  }
  #endif
  
  /* print a ratio - size reduction as a fraction of uncompressed size */
  static void
  print_ratio(off_t in, off_t out, FILE *where)
  {
  	int percent10;	/* 10 * percent */
  	off_t diff;
  	char buff[8];
  	int len;
  
  	diff = in - out/2;
  	if (in == 0 && out == 0)
  		percent10 = 0;
  	else if (diff < 0)
  		/*
  		 * Output is more than double size of input! print -99.9%
  		 * Quite possibly we've failed to get the original size.
  		 */
  		percent10 = -999;
  	else {
  		/*
  		 * We only need 12 bits of result from the final division,
  		 * so reduce the values until a 32bit division will suffice.
  		 */
  		while (in > 0x100000) {
  			diff >>= 1;
  			in >>= 1;
  		}
  		if (in != 0)
  			percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
  		else
  			percent10 = 0;
  	}
  
  	len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
  	/* Move the '.' to before the last digit */
  	buff[len - 1] = buff[len - 2];
  	buff[len - 2] = '.';
  	fprintf(where, "%5s%%", buff);
  }
  
  #ifndef SMALL
  /* print compression statistics, and the new name (if there is one!) */
  static void
  print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
  {
  	if (file)
  		fprintf(stderr, "%s:%s  ", file,
  		    strlen(file) < 7 ? "\t\t" : "\t");
  	print_ratio(usize, gsize, stderr);
  	if (nfile)
  		fprintf(stderr, " -- replaced with %s", nfile);
  	fprintf(stderr, "\n");
  	fflush(stderr);
  }
  
  /* print test results */
  static void
  print_test(const char *file, int ok)
  {
  
  	if (exit_value == 0 && ok == 0)
  		exit_value = 1;
  	fprintf(stderr, "%s:%s  %s\n", file,
  	    strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
  	fflush(stderr);
  }
  #endif
  
  /* print a file's info ala --list */
  /* eg:
    compressed uncompressed  ratio uncompressed_name
        354841      1679360  78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
  */
  static void
  print_list(int fd, off_t out, const char *outfile, time_t ts)
  {
  	static int first = 1;
  #ifndef SMALL
  	static off_t in_tot, out_tot;
  	uint32_t crc = 0;
  #endif
  	off_t in = 0, rv;
  
  	if (first) {
  #ifndef SMALL
  		if (vflag)
  			printf("method  crc     date  time  ");
  #endif
  		if (qflag == 0)
  			printf("  compressed uncompressed  "
  			       "ratio uncompressed_name\n");
  	}
  	first = 0;
  
  	/* print totals? */
  #ifndef SMALL
  	if (fd == -1) {
  		in = in_tot;
  		out = out_tot;
  	} else
  #endif
  	{
  		/* read the last 4 bytes - this is the uncompressed size */
  		rv = lseek(fd, (off_t)(-8), SEEK_END);
  		if (rv != -1) {
  			unsigned char buf[8];
  			uint32_t usize;
  
  			rv = read(fd, (char *)buf, sizeof(buf));
  			if (rv == -1)
  				maybe_warn("read of uncompressed size");
  			else if (rv != sizeof(buf))
  				maybe_warnx("read of uncompressed size");
  
  			else {
  				usize = le32dec(&buf[4]);
  				in = (off_t)usize;
  #ifndef SMALL
  				crc = le32dec(&buf[0]);
  #endif
  			}
  		}
  	}
  
  #ifndef SMALL
  	if (vflag && fd == -1)
  		printf("                            ");
  	else if (vflag) {
  		char *date = ctime(&ts);
  
  		/* skip the day, 1/100th second, and year */
  		date += 4;
  		date[12] = 0;
  		printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
  	}
  	in_tot += in;
  	out_tot += out;
  #else
  	(void)&ts;	/* XXX */
  #endif
  	print_list_out(out, in, outfile);
  }
  
  static void
  print_list_out(off_t out, off_t in, const char *outfile)
  {
  	printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
  	print_ratio(in, out, stdout);
  	printf(" %s\n", outfile);
  }
  
  /* display the usage of NetBSD gzip */
  static void
  usage(void)
  {
  
  	fprintf(stderr, "%s\n", gzip_version);
  	fprintf(stderr,
  #ifdef SMALL
      "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n",
  #else
      "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n"
      " -1 --fast            fastest (worst) compression\n"
      " -2 .. -8             set compression level\n"
      " -9 --best            best (slowest) compression\n"
      " -c --stdout          write to stdout, keep original files\n"
      "    --to-stdout\n"
      " -d --decompress      uncompress files\n"
      "    --uncompress\n"
      " -f --force           force overwriting & compress links\n"
      " -h --help            display this help\n"
      " -k --keep            don't delete input files during operation\n"
      " -l --list            list compressed file contents\n"
      " -N --name            save or restore original file name and time stamp\n"
      " -n --no-name         don't save original file name or time stamp\n"
      " -q --quiet           output no warnings\n"
      " -r --recursive       recursively compress files in directories\n"
      " -S .suf              use suffix .suf instead of .gz\n"
      "    --suffix .suf\n"
      " -t --test            test compressed file\n"
      " -V --version         display program version\n"
      " -v --verbose         print extra statistics\n",
  #endif
  	    getprogname());
  	exit(0);
  }
  
  #ifndef SMALL
  /* display the license information of FreeBSD gzip */
  static void
  display_license(void)
  {
  
  	fprintf(stderr, "%s (based on NetBSD gzip 20150113)\n", gzip_version);
  	fprintf(stderr, "%s\n", gzip_copyright);
  	exit(0);
  }
  #endif
  
  /* display the version of NetBSD gzip */
  static void
  display_version(void)
  {
  
  	fprintf(stderr, "%s\n", gzip_version);
  	exit(0);
  }
  
  #ifndef NO_BZIP2_SUPPORT
  #include "unbzip2.c"
  #endif
  #ifndef NO_COMPRESS_SUPPORT
  #include "zuncompress.c"
  #endif
  #ifndef NO_PACK_SUPPORT
  #include "unpack.c"
  #endif
  #ifndef NO_XZ_SUPPORT
  #include "unxz.c"
  #endif
  #ifndef NO_LZ_SUPPORT
  #include "unlz.c"
  #endif
  
  static ssize_t
  read_retry(int fd, void *buf, size_t sz)
  {
  	char *cp = buf;
  	size_t left = MIN(sz, (size_t) SSIZE_MAX);
  
  	while (left > 0) {
  		ssize_t ret;
  
  		ret = read(fd, cp, left);
  		if (ret == -1) {
  			return ret;
  		} else if (ret == 0) {
  			break; /* EOF */
  		}
  		cp += ret;
  		left -= ret;
  	}
  
  	return sz - left;
  }
  
  static ssize_t
  write_retry(int fd, const void *buf, size_t sz)
  {
  	const char *cp = buf;
  	size_t left = MIN(sz, (size_t) SSIZE_MAX);
  
  	while (left > 0) {
  		ssize_t ret;
  
  		ret = write(fd, cp, left);
  		if (ret == -1) {
  			return ret;
  		} else if (ret == 0) {
  			abort();	/* Can't happen */
  		}
  		cp += ret;
  		left -= ret;
  	}
  
  	return sz - left;
  }
  