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zgz.c
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zgz.c
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/*
* Authors: Faidon Liambotis <paravoid@debian.org>
* Josh Triplett <josh@joshtriplett.org>
*
* This is a zlib-based gzip that is heavily based on NetBSD's gzip,
* developed by Matthew R. Green.
*
* This is suited for gzip regeneration and is part of pristine-tar.
* As such, it adds some extra options which are needed to successfully
* reproduce the gzips out there and removes features of the original
* implementation that were not relevant (e.g. decompression)
*
* It also has a mode to generate old bzip2 files.
*
* Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green
* Copyright (c) 2007 Faidon Liambotis
* Copyright (c) 2008 Josh Triplett
* Copyright (c) 2010 Joey Hess
* 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.
*/
/*
* 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
*
*/
#define _GNU_SOURCE
#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>
extern void gnuzip(int in, int out, char *origname, unsigned long timestamp, int level, int osflag, int rsync, int newrsync);
extern void old_bzip2(int level);
#define BUFLEN (64 * 1024)
#define GZIP_MAGIC0 0x1F
#define GZIP_MAGIC1 0x8B
#define HEAD_CRC 0x02
#define EXTRA_FIELD 0x04
#define ORIG_NAME 0x08
#define COMMENT 0x10
#define GZIP_OS_UNIX 3 /* Unix */
#define GZIP_OS_NTFS 11 /* NTFS */
static const char gzip_version[] = "zgz 20100613 based on NetBSD gzip 20060927, GNU gzip 1.3.12, and bzip2 0.9.5d";
static const char gzip_copyright[] = \
" Authors: Faidon Liambotis <paravoid@debian.org>\n"
" Josh Triplett <josh@joshtriplett.org>\n"
"\n"
" Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green\n"
" Copyright (c) 2007 Faidon Liambotis\n"
" Copyright (c) 2008 Josh Triplett\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"
" * 3. The name of the author may not be used to endorse or promote products\n"
" * derived from this software without specific prior written permission.\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.";
static int qflag; /* quiet mode */
static void maybe_err(const char *fmt, ...)
__attribute__((__format__(__printf__, 1, 2),noreturn));
static void maybe_errx(const char *fmt, ...)
__attribute__((__format__(__printf__, 1, 2),noreturn));
static void gz_compress(int, int, const char *, uint32_t, int, int, int, int, int);
static void usage(void);
static void display_version(void);
static void display_license(void);
int main(int, char **p);
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' },
{ "no-name", no_argument, 0, 'n' },
{ "name", no_argument, 0, 'N' },
{ "quiet", no_argument, 0, 'q' },
{ "fast", no_argument, 0, '1' },
{ "best", no_argument, 0, '9' },
{ "ascii", no_argument, 0, 'a' },
/* new options */
{ "gnu", no_argument, 0, 'G' },
{ "old-bzip2", no_argument, 0, 'O' },
{ "zlib", no_argument, 0, 'Z' },
{ "rsyncable", no_argument, 0, 'R' },
{ "new-rsyncable", no_argument, 0, 'r' },
{ "no-timestamp", no_argument, 0, 'm' },
{ "force-timestamp", no_argument, 0, 'M' },
{ "timestamp", required_argument, 0, 'T' },
{ "osflag", required_argument, 0, 's' },
{ "original-name", required_argument, 0, 'o' },
{ "filename", required_argument, 0, 'F' },
{ "quirk", required_argument, 0, 'k' },
/* end */
{ "version", no_argument, 0, 'V' },
{ "license", no_argument, 0, 'L' },
{ NULL, no_argument, 0, 0 },
};
int
main(int argc, char **argv)
{
const char *progname = argv[0];
int gnu = 0;
int bzold = 0;
int quirks = 0;
char *origname = NULL;
uint32_t timestamp = 0;
int memlevel = 8; /* zlib's default */
int nflag = 0;
int mflag = 0;
int fflag = 0;
int xflag = -1;
int ntfs_quirk = 0;
int level = 6;
int osflag = GZIP_OS_UNIX;
int rsync = 0;
int new_rsync = 0;
int ch;
if (strcmp(progname, "gunzip") == 0 ||
strcmp(progname, "zcat") == 0 ||
strcmp(progname, "gzcat") == 0) {
fprintf(stderr, "%s: decompression is not supported on this version\n", progname);
usage();
}
#define OPT_LIST "123456789acdfhF:GLNnMmqRrT:Vo:k:s:ZO"
while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) {
switch (ch) {
case 'G':
gnu = 1;
break;
case 'O':
bzold = 1;
break;
case 'Z':
break;
case '1': case '2': case '3':
case '4': case '5': case '6':
case '7': case '8': case '9':
level = ch - '0';
break;
case 'c':
/* Ignored for compatibility; zgz always uses -c */
break;
case 'f':
fflag = 1;
break;
case 'N':
nflag = 0;
break;
case 'n':
nflag = 1;
/* no break, n implies m */
case 'm':
mflag = 1;
break;
case 'M':
mflag = 0;
break;
case 'q':
qflag = 1;
break;
case 's':
osflag = atoi(optarg);
break;
case 'F':
case 'o':
origname = optarg;
break;
case 'k':
quirks = 1;
if (strcmp(optarg, "buggy-bsd") == 0) {
/* certain archives made with older versions of
* BSD variants of gzip */
/* no name or timestamp information */
nflag = 1;
mflag = 1;
/* maximum compression but without indicating so */
level = 9;
xflag = 0;
} else if (strcmp(optarg, "ntfs") == 0) {
ntfs_quirk = 1;
/* no name or timestamp information */
nflag = 1;
mflag = 1;
/* osflag is NTFS */
osflag = GZIP_OS_NTFS;
} else if (strcmp(optarg, "perl") == 0) {
/* Perl's Compress::Raw::Zlib */
memlevel = 9;
/* no name or timestamp information */
nflag = 1;
mflag = 1;
/* maximum compression but without indicating so */
level = 9;
xflag = 0;
} else {
fprintf(stderr, "%s: unknown quirk!\n", progname);
usage();
}
break;
case 'T':
timestamp = atoi(optarg);
break;
case 'R':
rsync = 1;
break;
case 'r':
new_rsync = 1;
break;
case 'd':
fprintf(stderr, "%s: decompression is not supported on this version\n", progname);
usage();
break;
case 'a':
fprintf(stderr, "%s: option --ascii ignored on this version\n", progname);
break;
case 'V':
display_version();
/* NOTREACHED */
case 'L':
display_license();
/* NOT REACHED */
default:
usage();
/* NOTREACHED */
}
}
argv += optind;
argc -= optind;
if (argc != 0) {
fprintf(stderr, "%s: filenames not supported; use stdin and stdout\n", progname);
return 1;
}
if (fflag == 0 && isatty(STDOUT_FILENO))
maybe_errx("standard output is a terminal -- ignoring");
if (nflag)
origname = NULL;
if (mflag)
timestamp = 0;
if (gnu) {
if (quirks) {
fprintf(stderr, "%s: quirks not supported with --gnu\n", progname);
return 1;
}
gnuzip(STDIN_FILENO, STDOUT_FILENO, origname, timestamp, level, osflag, rsync, new_rsync);
} else if (bzold) {
if (quirks) {
fprintf(stderr, "%s: quirks not supported with --old-bzip\n", progname);
return 1;
}
old_bzip2(level);
} else {
if (rsync || new_rsync) {
fprintf(stderr, "%s: --rsyncable not supported with --zlib\n", progname);
return 1;
}
gz_compress(STDIN_FILENO, STDOUT_FILENO, origname, timestamp, level, memlevel, osflag, xflag, ntfs_quirk);
}
return 0;
}
/* 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(1);
}
/* ... 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(1);
}
/* compress input to output. */
static void
gz_compress(int in, int out, const char *origname, uint32_t mtime, int level, int memlevel, int osflag, int xflag, int ntfs_quirk)
{
z_stream z;
char *outbufp, *inbufp;
off_t in_tot = 0;
ssize_t in_size;
int i, error;
uLong crc;
outbufp = malloc(BUFLEN);
inbufp = malloc(BUFLEN);
if (outbufp == NULL || inbufp == NULL)
maybe_err("malloc failed");
memset(&z, 0, sizeof z);
z.zalloc = Z_NULL;
z.zfree = Z_NULL;
z.opaque = 0;
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,
xflag >= 0 ? xflag :
level == 1 ? 4 : level == 9 ? 2 : 0,
osflag, origname ? origname : "");
if (i >= BUFLEN)
/* this need PATH_MAX > BUFLEN ... */
maybe_err("snprintf");
if (origname)
i++;
z.next_out = (unsigned char *)outbufp + i;
z.avail_out = BUFLEN - i;
error = deflateInit2(&z, level, Z_DEFLATED,
(-MAX_WBITS), memlevel, Z_DEFAULT_STRATEGY);
if (error != Z_OK)
maybe_err("deflateInit2 failed");
crc = crc32(0L, Z_NULL, 0);
for (;;) {
if (z.avail_out == 0) {
if (write(out, outbufp, BUFLEN) != BUFLEN)
maybe_err("write");
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_err("read");
if (in_size == 0)
break;
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_errx("deflate failed");
}
/* clean up */
for (;;) {
size_t len;
ssize_t w;
error = deflate(&z, Z_FINISH);
if (error != Z_OK && error != Z_STREAM_END)
maybe_errx("deflate failed");
len = (char *)z.next_out - outbufp;
/* for a really strange reason, that
* particular byte is decremented */
if (ntfs_quirk)
outbufp[10]--;
w = write(out, outbufp, len);
if (w == -1 || (size_t)w != len)
maybe_err("write");
z.next_out = (unsigned char *)outbufp;
z.avail_out = BUFLEN;
if (error == Z_STREAM_END)
break;
}
if (deflateEnd(&z) != Z_OK)
maybe_errx("deflateEnd failed");
if (ntfs_quirk) {
/* write NTFS tail magic (?) */
i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c",
0x00, 0x00, 0xff, 0xff, 0x03, 0x00);
if (i != 6)
maybe_err("snprintf");
if (write(out, outbufp, i) != i)
maybe_err("write");
}
/* write CRC32 and input size (ISIZE) at the tail */
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(out, outbufp, i) != i)
maybe_err("write");
free(inbufp);
free(outbufp);
}
/* display usage */
static void
usage(void)
{
fprintf(stderr, "%s\n", gzip_version);
fprintf(stderr,
"usage: zgz [-" OPT_LIST "] < <file> > <file>\n"
" -G --gnu use GNU gzip implementation\n"
" -Z --zlib use zlib's implementation (default)\n"
" -O --old-bzip2 generate bzip2 (0.9.5d) output\n"
" -1 --fast fastest (worst) compression\n"
" -2 .. -8 set compression level\n"
" -9 --best best (slowest) compression\n"
" -f --force force writing compressed data to a terminal\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"
" -m --no-timestamp don't save original time stamp\n"
" -M --force-timestemp save the timestamp even if -n was passed\n"
" -q --quiet output no warnings\n"
" -V --version display program version\n"
" -h --help display this help\n"
" -o NAME\n"
" --original-name NAME use NAME as the original file name\n"
" -F NAME --filename NAME same as --original-name\n"
" -s --osflag set the OS flag to something different than 03 (Unix)\n"
" -T --timestamp SECONDS set the timestamp to the specified number of seconds\n"
" \ngnu-specific options:\n"
" -R --rsyncable make rsync-friendly archive\n"
" -r --new-rsyncable make rsync-friendly archive (new version)\n"
" \nzlib-specific options:\n"
" -k --quirk QUIRK enable a format quirk (buggy-bsd, ntfs, perl)\n");
exit(0);
}
/* display the license information of NetBSD gzip */
static void
display_license(void)
{
fprintf(stderr, "%s\n", gzip_version);
fprintf(stderr, "%s\n", gzip_copyright);
exit(0);
}
/* display the version of NetBSD gzip */
static void
display_version(void)
{
fprintf(stderr, "%s\n", gzip_version);
exit(0);
}