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238c109f03
NetBSD/usr.bin/gzip/gzip.c
mrg cde2923d5b avoid an infinite loop while decompressing invalid gzip files. 
some minor CSE.  compare stat return value consistently.

thanks to tron for testing the first change.
2005-08-28 10:17:50 +00:00

1973 lines
41 KiB
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/* $NetBSD: gzip.c,v 1.73 2005/08/28 10:17:50 mrg Exp $ */
/*
* Copyright (c) 1997, 1998, 2003, 2004 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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 Matthew R. Green\n\
All rights reserved.\n");
__RCSID("$NetBSD: gzip.c,v 1.73 2005/08/28 10:17:50 mrg Exp $");
#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
* - handle some signals better (remove outfile?)
* - make bzip2/compress -v/-t/-l support work as well as possible
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.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>
#ifndef PRIdOFF
#define PRIdOFF PRId64
#endif
/* 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
FT_LAST,
FT_UNKNOWN
};
#ifndef NO_BZIP2_SUPPORT
#include <bzlib.h>
#define BZ2_SUFFIX ".bz2"
#define BZIP2_MAGIC "\102\132\150"
#endif
#ifndef NO_COMPRESS_SUPPORT
#define Z_SUFFIX ".Z"
#define Z_MAGIC "\037\235"
#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, ""),
#endif
#ifndef NO_COMPRESS_SUPPORT
SUFFIX(Z_SUFFIX, ""),
#endif
SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S "" */
#endif /* SMALL */
#undef SUFFIX
};
#define NUM_SUFFIXES (sizeof suffixes / sizeof suffixes[0])
static const char gzip_version[] = "NetBSD gzip 20040830";
static int cflag; /* stdout mode */
static int dflag; /* decompress mode */
static int lflag; /* list mode */
static int numflag = 6; /* gzip -1..-9 value */
#ifndef SMALL
static int fflag; /* force mode */
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 */
#else
#define qflag 0
#define tflag 0
#endif
static int exit_value = 0; /* exit value */
static char *infile; /* name of file coming in */
static void maybe_err(const char *fmt, ...)
__attribute__((__format__(__printf__, 1, 2)));
#ifndef NO_BZIP2_SUPPORT
static void maybe_errx(const char *fmt, ...)
__attribute__((__format__(__printf__, 1, 2)));
#endif
static void maybe_warn(const char *fmt, ...)
__attribute__((__format__(__printf__, 1, 2)));
static void maybe_warnx(const char *fmt, ...)
__attribute__((__format__(__printf__, 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);
static void display_version(void);
static const suffixes_t *check_suffix(char *, int);
static ssize_t read_retry(int, void *, size_t);
#ifdef SMALL
#define unlink_input(f, sb) unlink(f)
#else
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 *, struct stat *);
static void print_verbage(const char *, const char *, off_t, off_t);
static void print_test(const char *, int);
static void copymodes(const char *, struct stat *);
static int check_outfile(const char *outfile, struct stat *sb);
#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
int main(int, char *p[]);
#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' },
{ "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' },
#if 0
/*
* This is what else GNU gzip implements. --ascii isn't useful
* on NetBSD, and I don't care to have a --license.
*/
{ "ascii", no_argument, 0, 'a' },
{ "license", no_argument, 0, 'L' },
#endif
{ 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;
/* XXX set up 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 "cdhHltV123456789"
#else
#define OPT_LIST "cdfhHlnNqrS:tvV123456789"
#endif
while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) {
switch (ch) {
case 'c':
cflag = 1;
break;
case 'd':
dflag = 1;
break;
case 'l':
lflag = 1;
dflag = 1;
break;
case 'V':
display_version();
/* NOTREACHED */
case '1': case '2': case '3':
case '4': case '5': case '6':
case '7': case '8': case '9':
numflag = ch - '0';
break;
#ifndef SMALL
case 'f':
fflag = 1;
break;
case 'n':
nflag = 1;
Nflag = 0;
break;
case 'N':
nflag = 0;
Nflag = 1;
break;
case 'q':
qflag = 1;
break;
case 'r':
rflag = 1;
break;
case 'S':
len = strlen(optarg);
if (len != 0) {
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);
}
#ifndef NO_BZIP2_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 = 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(out, outbufp, BUFLEN) != BUFLEN) {
maybe_warn("write");
in_tot = -1;
goto out;
}
out_tot += BUFLEN;
z.next_out = 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;
crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size);
in_tot += in_size;
z.next_in = 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;
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;
if (write(out, outbufp, len) != len) {
maybe_warn("write");
out_tot = -1;
goto out;
}
out_tot += len;
z.next_out = 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 (in_tot > 0xffffffff)
maybe_warn("input file size >= 4GB cannot be saved");
if (write(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 = pre;
z.avail_out = BUFLEN;
z.next_out = outbufp;
z.zalloc = NULL;
z.zfree = NULL;
z.opaque = 0;
in_tot = prelen;
out_tot = 0;
for (;;) {
if ((z.avail_in == 0 || needmore) && done_reading == 0) {
size_t in_size;
if (z.avail_in > 0) {
memmove(inbufp, z.next_in, z.avail_in);
}
z.next_in = inbufp;
in_size = read(in, z.next_in + z.avail_in,
BUFLEN - z.avail_in);
if (in_size == -1) {
#ifndef SMALL
if (tflag && vflag)
print_test(filename, 0);
#endif
maybe_warn("failed to read stdin");
goto stop_and_fail;
} else if (in_size == 0) {
done_reading = 1;
}
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;
}
switch (state) {
case GZSTATE_MAGIC0:
if (*z.next_in != GZIP_MAGIC0) {
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:
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(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 = 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 = ((unsigned)z.next_in[0] & 0xff) |
((unsigned)z.next_in[1] & 0xff) << 8 |
((unsigned)z.next_in[2] & 0xff) << 16 |
((unsigned)z.next_in[3] & 0xff) << 24;
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 = ((unsigned)z.next_in[0] & 0xff) |
((unsigned)z.next_in[1] & 0xff) << 8 |
((unsigned)z.next_in[2] & 0xff) << 16 |
((unsigned)z.next_in[3] & 0xff) << 24;
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);
#ifndef SMALL
if (tflag && vflag)
print_test(filename, out_tot != -1);
#endif
free(inbufp);
out1:
free(outbufp);
out2:
if (gsizep)
*gsizep = in_tot;
return (out_tot);
}
#ifndef SMALL
/*
* set the owner, mode, flags & utimes for a file
*/
static void
copymodes(const char *file, struct stat *sbp)
{
struct timeval times[2];
/*
* 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)chmod(file, DEFFILEMODE & ~mask);
(void)umask(mask);
return;
}
/* if the chown fails, remove set-id bits as-per compress(1) */
if (chown(file, sbp->st_uid, sbp->st_gid) < 0) {
if (errno != EPERM)
maybe_warn("couldn't chown: %s", file);
sbp->st_mode &= ~(S_ISUID|S_ISGID);
}
/* we only allow set-id and the 9 normal permission bits */
sbp->st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
if (chmod(file, sbp->st_mode) < 0)
maybe_warn("couldn't chmod: %s", file);
/* only try flags if they exist already */
if (sbp->st_flags != 0 && chflags(file, sbp->st_flags) < 0)
maybe_warn("couldn't chflags: %s", file);
TIMESPEC_TO_TIMEVAL(&times[0], &sbp->st_atimespec);
TIMESPEC_TO_TIMEVAL(&times[1], &sbp->st_mtimespec);
if (utimes(file, times) < 0)
maybe_warn("couldn't utimes: %s", file);
}
#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
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 overwritting\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, struct stat *sb)
{
struct stat nsb;
if (stat(file, &nsb) != 0)
/* Must be gone alrady */
return;
if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
/* Definitely a different file */
return;
unlink(file);
}
#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, insize;
#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;
}
if (cflag == 0) {
#ifndef SMALL
if (stat(file, &isb) == 0) {
if (isb.st_nlink > 1 && fflag == 0) {
maybe_warnx("%s has %d other link%s -- "
"skipping", file, 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 (snprintf(outfile, outsize, "%s%s",
file, suffixes[0].zipped) >= outsize)
memcpy(outfile - suffixes[0].ziplen - 1,
suffixes[0].zipped, suffixes[0].ziplen + 1);
#ifndef SMALL
if (check_outfile(outfile, &osb) == 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;
}
} else
out = STDOUT_FILENO;
insize = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
(void)close(in);
/*
* If there was an error, insize 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 insize == -1 ? -1 : size;
if (close(out) == -1)
maybe_warn("couldn't close ouput");
#ifndef SMALL
if (stat(outfile, &osb) != 0) {
maybe_warn("couldn't stat: %s", outfile);
goto bad_outfile;
}
if (osb.st_size != size) {
maybe_warnx("output file: %s wrong size (%" PRIdOFF
" != %" PRIdOFF "), deleting",
outfile, osb.st_size, size);
goto bad_outfile;
}
copymodes(outfile, &isb);
#endif
/* output is good, ok to delete input */
unlink_input(file, &isb);
return size;
#ifndef SMALL
bad_outfile:
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 header1[4];
enum filetype method;
int fd, zfd = -1;
#ifndef SMALL
time_t timestamp = 0;
unsigned 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;
}
strlcpy(outfile, file, outsize);
if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
maybe_warnx("%s: unknown suffix -- ignored", file);
goto lose;
}
rbytes = read(fd, header1, sizeof header1);
if (rbytes != sizeof header1) {
/* 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
maybe_warnx("%s: unexpected end of file", file);
goto lose;
}
method = file_gettype(header1);
#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 */
if (pread(fd, ts, sizeof ts, GZIP_TIMESTAMP) != sizeof ts) {
if (!fflag)
maybe_warn("can't read %s", file);
goto lose;
}
timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0];
if (header1[3] & ORIG_NAME) {
rbytes = pread(fd, name, sizeof name, GZIP_ORIGNAME);
if (rbytes < 0) {
maybe_warn("can't read %s", file);
goto lose;
}
if (name[0] != 0) {
/* preserve original directory name */
char *dp = strrchr(file, '/');
if (dp == NULL)
dp = file;
else
dp++;
snprintf(outfile, outsize, "%.*s%.*s",
(int) (dp - file),
file, (int) rbytes, name);
}
}
}
#endif
lseek(fd, 0, SEEK_SET);
if (cflag == 0 || lflag) {
if (fstat(fd, &isb) != 0)
goto lose;
#ifndef SMALL
if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
maybe_warnx("%s has %d other links -- skipping",
file, isb.st_nlink - 1);
goto lose;
}
if (nflag == 0 && timestamp)
isb.st_mtime = timestamp;
if (check_outfile(outfile, &osb) == 0)
goto lose;
#endif
}
if (cflag == 0 && lflag == 0) {
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;
}
} else
zfd = STDOUT_FILENO;
#ifndef NO_BZIP2_SUPPORT
if (method == FT_BZIP2) {
/* XXX */
if (lflag) {
maybe_warnx("no -l with bzip2 files");
goto lose;
}
size = unbzip2(fd, zfd, NULL, 0, NULL);
} else
#endif
#ifndef NO_COMPRESS_SUPPORT
if (method == 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... */
if (ferror(in) | fclose(in)) {
maybe_warn("failed infile fclose");
unlink(outfile);
(void)fclose(out);
}
if (fclose(out) != 0) {
maybe_warn("failed outfile fclose");
unlink(outfile);
goto lose;
}
} else
#endif
#ifndef SMALL
if (method == FT_UNKNOWN) {
if (lflag) {
maybe_warnx("no -l for unknown filetypes");
goto lose;
}
size = cat_fd(NULL, 0, NULL, fd);
} else
#endif
{
if (lflag) {
print_list(fd, isb.st_size, outfile, isb.st_mtime);
close(fd);
return -1; /* XXX */
}
size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
}
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.
*/
if (stat(outfile, &osb) != 0) {
maybe_warn("couldn't stat (leaving original): %s",
outfile);
return -1;
}
if (osb.st_size != size) {
maybe_warnx("stat gave different size: %" PRIdOFF
" != %" PRIdOFF " (leaving original)",
size, osb.st_size);
unlink(outfile);
return -1;
}
unlink_input(file, &isb);
#ifndef SMALL
copymodes(outfile, &isb);
#endif
return size;
lose:
if (fd != -1)
close(fd);
if (zfd != -1 && zfd != STDOUT_FILENO)
close(fd);
return -1;
}
#ifndef SMALL
static off_t
cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd)
{
char buf[BUFLEN];
size_t rv;
off_t in_tot;
in_tot = count;
if (write(STDOUT_FILENO, prepend, count) != count) {
maybe_warn("write to stdout");
return -1;
}
for (;;) {
rv = read(fd, buf, sizeof buf);
if (rv == 0)
break;
if (rv < 0) {
maybe_warn("read from fd %d", fd);
break;
}
if (write(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)
{
unsigned char header1[4];
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");
return;
}
#endif
if (lflag) {
struct stat isb;
/* XXX could read the whole file, etc. */
if (fstat(STDIN_FILENO, &isb) < 0) {
maybe_warn("fstat");
return;
}
print_list(STDIN_FILENO, isb.st_size, "stdout", isb.st_mtime);
return;
}
bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1);
if (bytes_read == -1) {
maybe_warn("can't read stdin");
return;
} else if (bytes_read != sizeof(header1)) {
maybe_warnx("unexpected EOF");
return;
}
method = file_gettype(header1);
switch (method) {
default:
#ifndef SMALL
if (fflag == 0) {
maybe_warnx("unknown compression format");
return;
}
usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO);
break;
#endif
case FT_GZIP:
usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
header1, sizeof header1, &gsize, "(stdin)");
break;
#ifndef NO_BZIP2_SUPPORT
case FT_BZIP2:
usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
header1, sizeof header1, &gsize);
break;
#endif
#ifndef NO_COMPRESS_SUPPORT
case FT_Z:
if ((in = zdopen(STDIN_FILENO)) == NULL) {
maybe_warnx("zopen of stdin");
return;
}
usize = zuncompress(in, stdout, header1, sizeof header1, &gsize);
fclose(in);
break;
#endif
}
#ifndef SMALL
if (vflag && !tflag && usize != -1 && gsize != -1)
print_verbage(NULL, NULL, usize, gsize);
#endif
}
static void
handle_stdout(void)
{
off_t gsize, usize;
struct stat sb;
time_t systime;
uint32_t mtime;
int ret;
#ifndef SMALL
if (fflag == 0 && isatty(STDOUT_FILENO)) {
maybe_warnx("standard output is a terminal -- ignoring");
return;
}
#endif
/* If stdin is a file use it's mtime, otherwise use current time */
ret = fstat(STDIN_FILENO, &sb);
#ifndef SMALL
if (ret < 0) {
maybe_warn("Can't stat stdin");
return;
}
#endif
if (S_ISREG(sb.st_mode))
mtime = (uint32_t)sb.st_mtime;
else {
systime = time(NULL);
#ifndef SMALL
if (systime == -1) {
maybe_warn("time");
return;
}
#endif
mtime = (uint32_t)systime;
}
usize = 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) {
/* 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, &sb);
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 = file;
if (dflag) {
usize = file_uncompress(file, outfile, sizeof(outfile));
if (usize == -1)
return;
gsize = sbp->st_size;
} else {
gsize = file_compress(file, outfile, sizeof(outfile));
if (gsize == -1)
return;
usize = sbp->st_size;
}
#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, struct stat *sbp)
{
char *path_argv[2];
FTS *fts;
FTSENT *entry;
path_argv[0] = dir;
path_argv[1] = 0;
fts = fts_open(path_argv, FTS_PHYSICAL, NULL);
if (fts == NULL) {
warn("couldn't fts_open %s", dir);
return;
}
while ((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_name, entry->fts_statp);
}
}
(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 (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;
int 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;
if (read(fd, (char *)buf, sizeof(buf)) != sizeof(buf))
maybe_warn("read of uncompressed size");
usize = buf[4] | buf[5] << 8 | buf[6] << 16 | buf[7] << 24;
in = (off_t)usize;
#ifndef SMALL
crc = buf[0] | buf[1] << 8 | buf[2] << 16 | buf[3] << 24;
#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;
#endif
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,
"usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n"
#ifndef SMALL
" -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"
" -n --no-name don't save original file name or time stamp\n"
" -N --name save or restore original file name and 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 --verbose print extra statistics\n"
" -V --version display program version\n"
" -1 --fast fastest (worst) compression\n"
" -2 .. -8 set compression level\n"
" -9 --best best (slowest) compression\n",
#else
,
#endif
getprogname());
exit(0);
}
/* 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
static ssize_t
read_retry(int fd, void *buf, size_t sz)
{
char *cp = buf;
ssize_t left = sz;
while (left > 0) {
ssize_t ret;
ret = read(fd, cp, sz);
if (ret == -1) {
return ret;
} else if (ret == 0) {
break; /* EOF */
}
cp += ret;
left -= ret;
}
return sz - left;
}
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