4.4BSD/usr/src/contrib/gzip-1.0.7/gzip.c
/* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
* Copyright (C) 1992-1993 Jean-loup Gailly
* The unzip code was written and put in the public domain by Mark Adler.
* Portions of the lzw code are derived from the public domain 'compress'
* written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
* Ken Turkowski, Dave Mack and Peter Jannesen.
*
* See the license_msg below and the file COPYING for the software license.
* See the file algorithm.doc for the compression algorithms and file formats.
*/
static char *license_msg[] = {
" Copyright (C) 1992-1993 Jean-loup Gailly",
" This program is free software; you can redistribute it and/or modify",
" it under the terms of the GNU General Public License as published by",
" the Free Software Foundation; either version 2, or (at your option)",
" any later version.",
"",
" This program is distributed in the hope that it will be useful,",
" but WITHOUT ANY WARRANTY; without even the implied warranty of",
" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the",
" GNU General Public License for more details.",
"",
" You should have received a copy of the GNU General Public License",
" along with this program; if not, write to the Free Software",
" Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.",
0};
/* Compress files with zip algorithm and 'compress' interface.
* See usage() and help() functions below for all options.
* Outputs:
* file.z: compressed file with same mode, owner, and utimes
* file.Z: same with -Z option (old compress format)
* or stdout with -c option or if stdin used as input.
* If the OS does not support file names with multiple dots (MSDOS, VMS) or
* if the output file name had to be truncated, the original name is kept
* in the compressed .z file. (Feature not available in old compress format.)
* On MSDOS, file.tmp -> file.tmz. On VMS, file.tmp -> file.tmp-z.
*
* For the meaning of all compilation flags, see comments in Makefile.in.
*/
#ifndef lint
static char rcsid[] = "$Id: gzip.c,v 0.17 1993/03/18 18:14:56 jloup Exp $";
#endif
#include "tailor.h"
#include "gzip.h"
#include "lzw.h"
#include "revision.h"
#include "getopt.h"
#include <stdio.h>
#include <ctype.h>
#include <sys/types.h>
#include <signal.h>
#include <sys/stat.h>
#include <errno.h>
/* configuration */
#ifndef NO_FCNTL_H
# include <fcntl.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#if defined(STDC_HEADERS) || !defined(NO_STDLIB_H)
# include <stdlib.h>
#else
extern int errno;
#endif
#if defined(DIRENT) || defined(_POSIX_VERSION)
# include <dirent.h>
typedef struct dirent dir_type;
# define NLENGTH(dirent) ((int)strlen((dirent)->d_name))
# define DIR_OPT "DIRENT"
#else
# define NLENGTH(dirent) ((dirent)->d_namlen)
# ifdef SYSDIR
# include <sys/dir.h>
typedef struct direct dir_type;
# define DIR_OPT "SYSDIR"
# else
# ifdef SYSNDIR
# include <sys/ndir.h>
typedef struct direct dir_type;
# define DIR_OPT "SYSNDIR"
# else
# ifdef NDIR
# include <ndir.h>
typedef struct direct dir_type;
# define DIR_OPT "NDIR"
# else
# define NO_DIR
# define DIR_OPT "NO_DIR"
# endif
# endif
# endif
#endif
#ifndef NO_UTIME
# ifndef NO_UTIME_H
# include <utime.h>
# define TIME_OPT "UTIME"
# else
# ifdef HAVE_SYS_UTIME_H
# include <sys/utime.h>
# define TIME_OPT "SYS_UTIME"
# else
struct utimbuf {
time_t actime;
time_t modtime;
};
# define TIME_OPT ""
# endif
# endif
#else
# define TIME_OPT "NO_UTIME"
#endif
#if !defined(S_ISDIR) && defined(S_IFDIR)
# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif
#if !defined(S_ISREG) && defined(S_IFREG)
# define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
#endif
typedef RETSIGTYPE (*sig_type)();
#ifndef O_BINARY
# define O_BINARY 0 /* creation mode for open() */
#endif
#ifndef O_CREAT
/* Pure BSD system? */
# include <sys/file.h>
# ifndef O_CREAT
# define O_CREAT FCREAT
# endif
# ifndef O_EXCL
# define O_EXCL FEXCL
# endif
#endif
#define RW_USER 0600 /* creation mode for open() */
#ifndef MAX_PATH_LEN
# define MAX_PATH_LEN 1024 /* max pathname length */
#endif
#define MAX_HEADER_LEN 16
/* max length of a compressed file header, fixed part only */
/* global buffers */
DECLARE(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
DECLARE(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
DECLARE(ush, d_buf, DIST_BUFSIZE);
DECLARE(uch, window, 2L*WSIZE);
#ifndef MAXSEG_64K
DECLARE(ush, tab_prefix, 1L<<BITS);
#else
DECLARE(ush, tab_prefix0, 1L<<(BITS-1));
DECLARE(ush, tab_prefix1, 1L<<(BITS-1));
#endif
/* local variables */
int to_stdout = 0; /* output to stdout (-c) */
int decompress = 0; /* decompress (-d) */
int force = 0; /* don't ask questions, compress links (-f) */
int recursive = 0; /* recurse through directories (-r) */
int verbose = 0; /* be verbose (-v) */
int quiet = 0; /* be very quiet (-q) */
int quit_on_tty = 0; /* quit if compressing to or decompressing from a tty */
int do_lzw = 0; /* generate output compatible with old compress (-Z) */
int test = 0; /* test .z file integrity */
int foreground; /* set if program run in foreground */
char *progname; /* program name */
int maxbits = BITS; /* max bits per code for LZW */
int method = DEFLATED;/* compression method */
int level = 5; /* compression level */
int exit_code = OK; /* program exit code */
int save_orig_name; /* set if original name must be saved */
int last_member; /* set for .zip and .Z files */
int part_nb; /* number of parts in .z file */
ulg time_stamp; /* original time stamp (modification time) */
long ifile_size; /* input file size, -1 for devices (debug only) */
char *env; /* contents of GZIP env variable */
char **args = NULL; /* argv pointer if GZIP env variable defined */
long bytes_in; /* number of input bytes */
long bytes_out; /* number of output bytes */
char ifname[MAX_PATH_LEN]; /* input filename */
char ofname[MAX_PATH_LEN]; /* output filename */
int remove_ofname = 0; /* remove output file on error */
struct stat istat; /* status for input file */
int ifd; /* input file descriptor */
int ofd; /* output file descriptor */
unsigned insize; /* valid bytes in inbuf */
unsigned inptr; /* index of next byte to be processed in inbuf */
unsigned outcnt; /* bytes in output buffer */
struct option longopts[] =
{
/* { name has_arg *flag val } */
/* {"ascii", 0, 0, 'a'}, ascii text mode */
{"stdout", 0, 0, 'c'}, /* write output on standard output */
{"decompress", 0, 0, 'd'}, /* decompress */
{"uncompress", 0, 0, 'd'}, /* decompress */
/* {"encrypt", 0, 0, 'e'}, encrypt */
{"force", 0, 0, 'f'}, /* force overwrite of output file */
{"help", 0, 0, 'h'}, /* give help */
/* {"pkzip", 0, 0, 'k'}, force output in pkzip format */
/* {"list", 0, 0, 'l'}, list .z file contents */
{"license", 0, 0, 'L'}, /* display software license */
{"quiet", 0, 0, 'q'}, /* quiet mode */
{"recurse", 0, 0, 'r'}, /* recurse through directories */
{"test", 0, 0, 't'}, /* test compressed file integrity */
{"verbose", 0, 0, 'v'}, /* verbose mode */
{"version", 0, 0, 'V'}, /* display version number */
{"fast", 0, 0, '1'}, /* compress faster */
{"best", 0, 0, '9'}, /* compress better */
{"lzw", 0, 0, 'Z'}, /* make output compatible with old compress */
{"bits", 1, 0, 'b'}, /* max number of bits per code (implies -Z) */
{ 0, 0, 0, 0 }
};
/* local functions */
local void usage OF((void));
local void help OF((void));
local void license OF((void));
local void version OF((void));
local void treat_stdin OF((void));
local void treat_file OF((char *iname));
local int create_outfile OF((void));
local int do_stat OF((char *name, struct stat *sbuf));
local char *get_suffix OF((char *name));
local int get_istat OF((char *iname, struct stat *sbuf));
local int make_ofname OF((void));
local int same_file OF((struct stat *stat1, struct stat *stat2));
local int name_too_long OF((char *name, struct stat *statb));
local int get_method OF((int in));
local int check_ofname OF((void));
local void reset_times OF((char *name, struct stat *statb));
local void copy_stat OF((struct stat *ifstat));
local void treat_dir OF((char *dir));
local void do_exit OF((int exitcode));
int main OF((int argc, char **argv));
void (*work) OF((int infile, int outfile)) = zip; /* function to call */
#define strequ(s1, s2) (strcmp((s1),(s2)) == 0)
/* ======================================================================== */
local void usage()
{
fprintf(stderr,
#ifdef LZW
# ifdef NO_DIR
"usage: %s [-cdfhLtvVZ19] [-b maxbits] [file ...]\n",
# else
"usage: %s [-cdfhLrtvVZ19] [-b maxbits] [file ...]\n",
# endif
#else /* !LZW */
# ifdef NO_DIR
"usage: %s [-cdfhLtvV19] [file ...]\n",
# else
"usage: %s [-cdfhLrtvV19] [file ...]\n",
# endif
#endif /* LZW */
progname);
}
/* ======================================================================== */
local void help()
{
static char *help_msg[] = {
/* -a --ascii ascii text; convert end-of-lines to local OS conventions */
" -c --stdout write on standard output, keep original files unchanged",
" -d --decompress decompress",
/* -e --encrypt encrypt */
" -f --force force overwrite of output file and compress links",
" -h --help give this help",
/* -k --pkzip force output in pkzip format */
/* -l --list list .z file contents */
" -L --license display software license",
" -q --quiet suppress all warnings",
#ifndef NO_DIR
" -r --recurse recurse through directories",
#endif
" -t --test test compressed file integrity",
" -v --verbose verbose mode",
" -V --version display version number",
" -1 --fast compress faster",
" -9 --best compress better",
#ifdef LZW
" -Z --lzw produce output compatible with old compress",
" -b --bits maxbits max number of bits per code (implies -Z)",
#endif
" file... files to (de)compress. If none given, use standard input.",
0};
char **p = help_msg;
fprintf(stderr,"%s %s (%s)\n", progname, VERSION, REVDATE);
usage();
while (*p) fprintf(stderr, "%s\n", *p++);
}
/* ======================================================================== */
local void license()
{
char **p = license_msg;
fprintf(stderr,"%s %s (%s)\n", progname, VERSION, REVDATE);
while (*p) fprintf(stderr, "%s\n", *p++);
}
/* ======================================================================== */
local void version()
{
fprintf(stderr,"%s %s (%s)\n", progname, VERSION, REVDATE);
fprintf(stderr, "Compilation options:\n%s %s ", DIR_OPT, TIME_OPT);
#ifdef STDC_HEADERS
fprintf(stderr, "STDC_HEADERS ");
#endif
#ifdef HAVE_UNISTD_H
fprintf(stderr, "HAVE_UNISTD_H ");
#endif
#ifdef NO_MEMORY_H
fprintf(stderr, "NO_MEMORY_H ");
#endif
#ifdef NO_STRING_H
fprintf(stderr, "NO_STRING_H ");
#endif
#ifdef NO_SYMLINK
fprintf(stderr, "NO_SYMLINK ");
#endif
#ifdef NO_MULTIPLE_DOTS
fprintf(stderr, "NO_MULTIPLE_DOTS ");
#endif
#ifdef NO_CHOWN
fprintf(stderr, "NO_CHOWN ");
#endif
#ifdef PROTO
fprintf(stderr, "PROTO ");
#endif
#ifdef ASMV
fprintf(stderr, "ASMV ");
#endif
#ifdef DEBUG
fprintf(stderr, "DEBUG ");
#endif
#ifdef DYN_ALLOC
fprintf(stderr, "DYN_ALLOC ");
#endif
#ifdef MAXSEG_64K
fprintf(stderr, "MAXSEG_64K");
#endif
fprintf(stderr, "\n");
}
/* ======================================================================== */
int main (argc, argv)
int argc;
char **argv;
{
int file_count = 0; /* number of files to precess */
int proglen; /* length of progname */
int optc; /* current option */
EXPAND(argc, argv); /* wild card expansion if necessary */
progname = basename(argv[0]);
proglen = strlen(progname);
/* Suppress .exe for MSDOS, OS/2 and VMS: */
if (proglen > 4 && strequ(progname+proglen-4, ".exe")) {
progname[proglen-4] = '\0';
}
/* Add options in GZIP environment variable if there is one */
env = add_envopt(&argc, &argv, OPTIONS_VAR);
if (env != NULL) args = argv;
foreground = signal(SIGINT, SIG_IGN) != SIG_IGN;
if (foreground) {
signal (SIGINT, (sig_type)abort_gzip);
}
#ifdef SIGTERM
signal(SIGTERM, (sig_type)abort_gzip);
#endif
#ifdef SIGHUP
signal(SIGHUP, (sig_type)abort_gzip);
#endif
#ifndef GNU_STANDARD
/* For compatibility with old compress, use program name as an option.
* If you compile with -DGNU_STANDARD, this program will behave as
* gzip even if it is invoked under the name gunzip or zcat.
*
* Systems which do not support links can still use -d or -dc.
* Ignore an .exe extension for MSDOS, OS/2 and VMS.
*/
if ( strncmp(progname, "un", 2) == 0 /* ungzip, uncompress */
|| strncmp(progname, "gun", 3) == 0) { /* gunzip */
decompress = 1;
} else if (strequ(progname+1, "cat") /* zcat, pcat */
|| strequ(progname, "gzcat")) { /* gzcat */
decompress = to_stdout = 1;
}
#endif
while ((optc = getopt_long (argc, argv, "b:cdfhLqrtvVZ123456789",
longopts, (int *)0)) != EOF) {
switch (optc) {
case 'b':
maxbits = atoi(optarg);
break;
case 'c':
to_stdout = 1; break;
case 'd':
decompress = 1; break;
case 'f':
force++; break;
case 'h':
help(); do_exit(OK); break;
case 'L':
license(); do_exit(OK); break;
case 'q':
quiet = 1; verbose = 0; break;
case 'r':
#ifdef NO_DIR
fprintf(stderr, "%s: -r not supported on this system\n", progname);
usage();
do_exit(ERROR); break;
#else
recursive = 1; break;
#endif
case 't':
test = decompress = to_stdout = 1;
break;
case 'v':
verbose++; quiet = 0; break;
case 'V':
version(); quit_on_tty = 1; break;
case 'Z':
#ifdef LZW
do_lzw = 1; break;
#else
fprintf(stderr, "%s: -Z not supported in this version\n",
progname);
usage();
do_exit(ERROR); break;
#endif
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
level = optc - '0';
break;
default:
/* Error message already emitted by getopt_long. */
usage();
do_exit(ERROR);
}
} /* loop on all arguments */
file_count = argc - optind;
if (do_lzw && !decompress) work = lzw;
/* Allocate all global buffers (for DYN_ALLOC option) */
ALLOC(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
ALLOC(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
ALLOC(ush, d_buf, DIST_BUFSIZE);
ALLOC(uch, window, 2L*WSIZE);
#ifndef MAXSEG_64K
ALLOC(ush, tab_prefix, 1L<<BITS);
#else
ALLOC(ush, tab_prefix0, 1L<<(BITS-1));
ALLOC(ush, tab_prefix1, 1L<<(BITS-1));
#endif
/* And get to work */
if (file_count != 0) {
if (to_stdout && !test) {
SET_BINARY_MODE(fileno(stdout));
}
while (optind < argc) {
treat_file(argv[optind++]);
}
} else { /* Standard input */
treat_stdin();
}
do_exit(exit_code);
return exit_code; /* just to avoid lint warning */
}
/* ========================================================================
* Compress or decompress stdin
*/
local void treat_stdin()
{
if (isatty(fileno((FILE *)(decompress ? stdin : stdout)))) {
/* Do not send compressed data to the terminal or read it from
* the terminal. We get here when user invoked the program
* without parameters, so be helpful. However, on systems supporting
* pseudo ttys, let the beginner stare at the 'hung' program
* (explicity request from Noah Friedman). Don't give an error message
* if the user only wanted the version number (gzip -V).
*/
if (quit_on_tty) do_exit(OK);
#ifdef NO_PTY
fprintf(stderr,
"%s: compressed data not %s a terminal. Redirect %s file or pipe.\n",
progname, decompress ? "read from" : "written to",
decompress ? "from" : "to");
fprintf(stderr,"For help, type: %s -h\n", progname);
do_exit(ERROR);
#endif
}
SET_BINARY_MODE(fileno(stdin));
if (!test) SET_BINARY_MODE(fileno(stdout));
strcpy(ifname, "stdin");
strcpy(ofname, "stdout");
/* Get the time stamp on the input file */
#ifdef NO_STDIN_FSTAT
time_stamp = 0; /* time unknown */
#else
if (fstat(fileno(stdin), &istat) != 0) {
error("fstat(stdin)");
}
time_stamp = istat.st_mtime;
#endif
ifile_size = -1L; /* convention for unknown size */
clear_bufs(); /* clear input and output buffers */
to_stdout = 1;
part_nb = 0;
if (decompress) {
method = get_method(ifd);
if (method < 0) {
do_exit(exit_code); /* error message already emitted */
}
}
/* Actually do the compression/decompression. Loop over zipped members.
*/
for (;;) {
(*work)(fileno(stdin), fileno(stdout));
if (!decompress || last_member || inptr == insize) break;
/* end of file */
method = get_method(ifd);
if (method == -1) return; /* error message already emitted */
bytes_out = 0; /* required for length check */
}
if (verbose) {
if (test) {
fprintf(stderr, " OK");
} else if (!decompress) {
fprintf(stderr, "Compression: ");
display_ratio(bytes_in-bytes_out-overhead, bytes_in);
}
fprintf(stderr, "\n");
}
}
/* ========================================================================
* Compress or decompress the given file
*/
local void treat_file(iname)
char *iname;
{
/* Check if the input file is present, set ifname and istat: */
if (get_istat(iname, &istat) != 0) return;
/* If the input name is that of a directory, recurse or ignore: */
if (S_ISDIR(istat.st_mode)) {
#ifndef NO_DIR
if (recursive) {
struct stat st;
st = istat;
treat_dir(iname);
/* Warning: ifname is now garbage */
reset_times (iname, &st);
} else
#endif
WARN((stderr,"%s: %s is a directory -- ignored\n", progname, ifname));
return;
}
if (!S_ISREG(istat.st_mode)) {
WARN((stderr,
"%s: %s is not a directory or a regular file - ignored\n",
progname, ifname));
return;
}
if (istat.st_nlink > 1 && !to_stdout && !force) {
WARN((stderr, "%s: %s has %d other link%c -- unchanged\n",
progname, ifname,
(int)istat.st_nlink - 1, istat.st_nlink > 2 ? 's' : ' '));
return;
}
ifile_size = istat.st_size;
time_stamp = istat.st_mtime;
/* Generate output file name */
if (to_stdout) {
strcpy(ofname, "stdout");
} else if (make_ofname() != 0) {
return;
}
/* Open the input file and determine compression method. The mode
* parameter is ignored but required by some systems (VMS).
*/
ifd = open(ifname, O_RDONLY | O_BINARY, RW_USER);
if (ifd == -1) {
perror(ifname);
exit_code = ERROR;
return;
}
clear_bufs(); /* clear input and output buffers */
part_nb = 0;
if (decompress) {
method = get_method(ifd); /* updates ofname if original given */
if (method < 0) {
close(ifd);
return; /* error message already emitted */
}
}
/* If compressing to a file, check if ofname is not ambiguous
* because the operating system truncates names. Otherwise, generate
* a new ofname and save the original name in the compressed file.
*/
if (to_stdout) {
ofd = fileno(stdout);
/* keep remove_ofname as zero */
} else {
if (create_outfile() == -1) return;
if (save_orig_name && !verbose && !quiet) {
fprintf(stderr, "%s: %s compressed to %s\n",
progname, ifname, ofname);
}
}
if (verbose) {
fprintf(stderr, "%s:\t%s", ifname, (int)strlen(ifname) >= 15 ?
"" : ((int)strlen(ifname) >= 7 ? "\t" : "\t\t"));
}
/* Actually do the compression/decompression. Loop over zipped members.
*/
for (;;) {
(*work)(ifd, ofd);
if (!decompress || last_member || inptr == insize) break;
/* end of file */
method = get_method(ifd);
if (method < 0) break; /* error message already emitted */
bytes_out = 0; /* required for length check */
}
close(ifd);
if (!to_stdout && close(ofd)) {
write_error();
}
if (method == -1) return; /* error, don't display success msg */
/* Display statistics */
if(verbose) {
if (!decompress) {
display_ratio(bytes_in-bytes_out-overhead, bytes_in);
}
if (test) {
fprintf(stderr, " OK");
} else if (!to_stdout) {
fprintf(stderr, " -- replaced with %s", ofname);
}
fprintf(stderr, "\n");
}
/* Copy modes, times, ownership */
if (!to_stdout) {
copy_stat(&istat);
}
}
/* ========================================================================
* Create the output file. Return 0 for success, -1 for error.
* Try twice if ofname is exactly one beyond the name limit, to avoid
* creating a compressed file of name "1234567890123."
* We could actually loop more than once if the user gives an extra long
* name, but I prefer generating an error then. (Posix forbids the system
* to truncate names.) The error message is generated by check_ofname()
* in this case.
* IN assertions: the input file has already been open (ifd is set) and
* ofname has already been updated if there was an original name.
* OUT assertions: ifd and ofd are closed in case of error.
*/
local int create_outfile()
{
struct stat ostat; /* stat for ofname */
int n; /* loop counter */
for (n = 1; n <= 2; n++) {
if (check_ofname() == -1) {
close(ifd);
return -1;
}
/* Create the output file */
remove_ofname = 1;
ofd = open(ofname, O_WRONLY|O_CREAT|O_EXCL|O_BINARY, RW_USER);
if (ofd == -1) {
perror(ofname);
close(ifd);
exit_code = ERROR;
return -1;
}
/* Check for name truncation on new file (1234567890123.z) */
if (fstat(ofd, &ostat) != 0) {
fprintf(stderr, "%s: ", progname);
perror(ofname);
close(ifd); close(ofd);
unlink(ofname);
exit_code = ERROR;
return -1;
}
if (!name_too_long(ofname, &ostat)) return 0;
if (decompress) {
/* name might be too long if an original name was saved */
WARN((stderr, "%s: %s: warning, name truncated\n",
progname, ofname));
return 0;
} else {
#ifdef NO_MULTIPLE_DOTS
/* Should never happen, see check_ofname() */
fprintf(stderr, "%s: %s: name too long\n", progname, ofname);
do_exit(ERROR);
#else
close(ofd);
unlink(ofname);
save_orig_name = 1;
strcpy(ofname+strlen(ofname)-Z_LEN-1, Z_SUFFIX);
/* 1234567890123.z -> 123456789012.z */
#endif
} /* decompress ? */
} /* for (n) */
close(ifd);
fprintf(stderr, "%s: %s: name too long\n", progname, ofname);
exit_code = ERROR;
return -1;
}
/* ========================================================================
* Use lstat if available, except for -c or -f. Use stat otherwise.
* This allows links when not removing the original file.
*/
local int do_stat(name, sbuf)
char *name;
struct stat *sbuf;
{
#if (defined(S_IFLNK) || defined (S_ISLNK)) && !defined(NO_SYMLINK)
if (!to_stdout && !force) {
return lstat(name, sbuf);
}
#endif
return stat(name, sbuf);
}
/* ========================================================================
* Return a pointer to the 'z' suffix of a file name, or NULL.
* For all systems, ".z", ".Z", ".taz", ".tgz", "-z" are accepted suffixes.
* ".tgz" is a useful convention for tar.z files on systems limited
* to 3 characters extensions. On such systems, ".?z" and ".??z" are
* also accepted suffixes. For Unix, we do not want to accept any
* .??z suffix as indicating a compressed file; some people use .xyz
* to denote volume data.
*/
local char *get_suffix(name)
char *name;
{
int len;
char *p = strrchr(name, '.');
char suffix[10]; /* last few chars of name, forced to lower case */
if (p == NULL || p == name || strchr(p-1, PATH_SEP) != NULL) return NULL;
strncpy(suffix, p, sizeof(suffix));
suffix[sizeof(suffix)-1] = '\0'; /* Force null termination */
#ifdef SUFFIX_SEP
/* strip a version number from the file name */
{
char *v = strrchr(suffix, SUFFIX_SEP);
if (v != NULL) *v = '\0';
}
#endif
strlwr(suffix);
if (strequ(suffix, ".z") || strequ(suffix, ".zip")
|| strequ(suffix, ".tgz") || strequ(suffix, ".taz")) {
return p;
}
len = strlen(suffix);
if (len <= 2) return NULL;
if (strequ(suffix+len-2, "-z")) return p+len-2;
#ifdef MAX_EXT_CHARS
if (suffix[len-1] == 'z') return p+len-1;
#endif
return NULL;
}
/* ========================================================================
* Set ifname to the input file name (with .z appended if necessary)
* and istat to its stats. Return 0 if ok, -1 if error.
*/
local int get_istat(iname, sbuf)
char *iname;
struct stat *sbuf;
{
int iexists; /* set if iname exists */
int ilen = strlen(iname);
char *suff;
strcpy(ifname, iname);
errno = 0;
/* If input file exists, return OK. */
if (do_stat(ifname, sbuf) == 0) return 0;
if (!decompress || errno != ENOENT) {
perror(ifname);
exit_code = ERROR;
return -1;
}
/* file.ext doesn't exist, try file.ext.z and file.ext.Z. For MSDOS
* try file.exz, for VMS try file.ext-z.
*/
suff = get_suffix(ifname);
if (suff != NULL) {
perror(ifname); /* ifname already has z suffix and does not exist */
exit_code = ERROR;
return -1;
}
#ifdef SUFFIX_SEP
/* strip a version number from the input file name */
if ((suff = strrchr(ifname, SUFFIX_SEP)) != NULL) *suff = '\0';
#endif
if (strrchr(ifname, '.') != NULL) {
strcat(ifname, Z_SUFFIX);
ilen += Z_LEN;
} else {
strcat(ifname, ".z");
ilen += 2;
}
errno = 0;
iexists = !do_stat(ifname, sbuf);
if (!iexists) {
errno = 0;
ifname[ilen-1] = 'Z';
iexists = !do_stat(ifname, sbuf);
}
#ifdef NO_MULTIPLE_DOTS
/* One more try just to be nice to you */
if (!iexists) {
char c = ifname[ilen-2];
errno = 0;
strcpy(ifname+ilen-2, "z");
iexists = !do_stat(ifname, sbuf);
if (!iexists) {
ifname[ilen-2] = c;
}
}
#endif
if (!iexists) {
ifname[ilen-1] = 'z';
perror(ifname);
exit_code = ERROR;
return -1;
}
if (!S_ISREG (sbuf->st_mode)) {
WARN((stderr, "%s: %s: not a regular file -- ignored\n",
progname, ifname));
return -1;
}
return 0; /* ok */
}
/* ========================================================================
* Generate ofname given ifname. Return 0 if ok, -1 if file must be skipped.
* Initializes save_orig_name.
* IN assertion: this function is not called if to_stdout is true.
*/
local int make_ofname()
{
char *suff; /* ofname z suffix */
strcpy(ofname, ifname);
suff = get_suffix(ofname);
if (decompress) {
if (suff == NULL) {
WARN((stderr,"%s: %s: no z suffix -- ignored\n",
progname, ifname));
return -1;
}
/* Make a special case for .tgz and .taz: */
strlwr(suff);
if (strequ(suff, ".tgz") || strequ(suff, ".taz")) {
strcpy(suff, ".tar");
} else {
*suff = '\0'; /* strip z suffix and optional version number */
}
/* ofname might be changed later if infile contains an original name */
} else if (suff != NULL) {
/* Avoid annoying messages with -r (see treat_dir()) */
if (verbose || (!recursive && !quiet)) {
fprintf(stderr, "%s: %s already has %s suffix -- unchanged\n",
progname, ifname, suff);
}
if (exit_code == OK) exit_code = WARNING;
return -1;
} else {
save_orig_name = 0;
#ifdef SUFFIX_SEP
/* strip a version number from the file name */
if ((suff = strrchr(ofname, SUFFIX_SEP)) != NULL) *suff = '\0';
#endif
#ifdef NO_MULTIPLE_DOTS
suff = strrchr(ofname, '.');
if (suff != NULL) {
# ifdef MAX_EXT_CHARS
/* On the Atari and some versions of MSDOS, name_too_long()
* does not work correctly because of a bug in stat(). So we
* must truncate here.
*/
if (strlen(suff) > MAX_EXT_CHARS) {
strcpy(suff + MAX_EXT_CHARS, do_lzw ? "Z" : "z");
save_orig_name = 1;
return 0;
}
# endif
strcat(ofname, Z_SUFFIX);
return 0;
}
#endif
strcat(ofname, do_lzw ? ".Z" : ".z");
} /* decompress ? */
return 0;
}
/* ========================================================================
* Check the magic number of the input file and update ofname if an
* original name was given and to_stdout is not set.
* Return the compression method, -1 for error, -2 for warning.
* Set inptr to the offset of the next byte to be processed.
* This function may be called repeatedly for an input file consisting
* of several contiguous gzip'ed members.
* IN assertions: there is at least one remaining compressed member.
* If the member is a zip file, it must be the only one.
*/
local int get_method(in)
int in; /* input file descriptor */
{
uch flags;
char magic[2]; /* magic header */
magic[0] = (char)get_byte();
magic[1] = (char)get_byte();
time_stamp = istat.st_mtime; /* may be modified later for some methods */
method = -1; /* unknown yet */
part_nb++; /* number of parts in gzip file */
last_member = RECORD_IO;
/* assume multiple members in gzip file except for record oriented I/O */
if (memcmp(magic, GZIP_MAGIC, 2) == 0
|| memcmp(magic, OLD_GZIP_MAGIC, 2) == 0) {
work = unzip;
method = (int)get_byte();
flags = (uch)get_byte();
if ((flags & ENCRYPTED) != 0) {
fprintf(stderr,
"%s: %s is encrypted -- get newer version of gzip\n",
progname, ifname);
exit_code = ERROR;
return -1;
}
if ((flags & CONTINUATION) != 0) {
fprintf(stderr,
"%s: %s is a a multi-part gzip file -- get newer version of gzip\n",
progname, ifname);
exit_code = ERROR;
if (force <= 1) return -1;
}
if ((flags & RESERVED) != 0) {
fprintf(stderr,
"%s: %s has flags 0x%x -- get newer version of gzip\n",
progname, ifname, flags);
exit_code = ERROR;
if (force <= 1) return -1;
}
time_stamp = (ulg)get_byte();
time_stamp |= ((ulg)get_byte()) << 8;
time_stamp |= ((ulg)get_byte()) << 16;
time_stamp |= ((ulg)get_byte()) << 24;
(void)get_byte(); /* Ignore extra flags for the moment */
(void)get_byte(); /* Ignore OS type for the moment */
if ((flags & CONTINUATION) != 0) {
unsigned part = (unsigned)get_byte();
part |= ((unsigned)get_byte())<<8;
if (verbose) {
fprintf(stderr,"%s: %s: part number %u\n",
progname, ifname, part);
}
}
if ((flags & EXTRA_FIELD) != 0) {
unsigned len = (unsigned)get_byte();
len |= ((unsigned)get_byte())<<8;
if (verbose) {
fprintf(stderr,"%s: %s: extra field of %u bytes ignored\n",
progname, ifname, len);
}
while (len--) (void)get_byte();
}
/* Get original file name if it was truncated */
if ((flags & ORIG_NAME) != 0) {
if (to_stdout || part_nb > 1) {
/* Discard the old name */
while (get_byte() != 0) /* null */ ;
} else {
/* Copy the base name. Keep a directory prefix intact. */
char *p = basename(ofname);
for (;;) {
*p = (char)get_byte();
if (*p++ == '\0') break;
if (p >= ofname+sizeof(ofname)) {
error("corrupted input -- file name too large");
}
}
} /* to_stdout */
} /* orig_name */
/* Discard file comment if any */
if ((flags & COMMENT) != 0) {
while (get_byte() != 0) /* null */ ;
}
} else if (memcmp(magic, PKZIP_MAGIC, 2) == 0 && inptr == 2
&& memcmp(inbuf, PKZIP_MAGIC, 4) == 0) {
/* To simplify the code, we support a zip file when alone only.
* We are thus guaranteed that the entire local header fits in inbuf.
*/
inptr = 0;
work = unzip;
if (check_zipfile(in) == -1) return -1;
/* check_zipfile may get ofname from the local header */
last_member = 1;
} else if (memcmp(magic, PACK_MAGIC, 2) == 0) {
work = unpack;
method = PACKED;
} else if (memcmp(magic, LZW_MAGIC, 2) == 0) {
work = unlzw;
method = COMPRESSED;
last_member = 1;
}
if (method >= 0) return method;
if (part_nb == 1) {
fprintf(stderr, "%s: %s is not in gzip format\n", progname, ifname);
exit_code = ERROR;
return -1;
} else {
WARN((stderr, "%s: %s: trailing garbage ignored\n", progname, ifname));
return -2;
}
}
/* ========================================================================
* Return true if the two stat structures correspond to the same file.
*/
local int same_file(stat1, stat2)
struct stat *stat1;
struct stat *stat2;
{
return stat1->st_mode == stat2->st_mode
&& stat1->st_ino == stat2->st_ino
&& stat1->st_dev == stat2->st_dev
&& stat1->st_uid == stat2->st_uid
&& stat1->st_gid == stat2->st_gid
&& stat1->st_size == stat2->st_size
&& stat1->st_atime == stat2->st_atime
&& stat1->st_mtime == stat2->st_mtime
&& stat1->st_ctime == stat2->st_ctime;
}
/* ========================================================================
* Return true if a file name is ambiguous because the operating system
* truncates file names.
*/
local int name_too_long(name, statb)
char *name; /* file name to check */
struct stat *statb; /* stat buf for this file name */
{
int s = strlen(name);
char c = name[s-1];
struct stat tstat; /* stat for truncated name */
int res;
tstat = *statb; /* Just in case OS does not fill all fields */
name[s-1] = '\0';
res = stat(name, &tstat) == 0 && same_file(statb, &tstat);
name[s-1] = c;
return res;
}
/* ========================================================================
* If compressing to a file, check if ofname is not ambigous
* because the operating system truncates names. Otherwise, generate
* a new ofname and save the original name in the compressed file.
* If the compressed file already exists, ask for confirmation.
* The check for name truncation is made dynamically, because different
* file systems on the same OS might use different truncation rules (on SVR4
* s5 truncates to 14 chars and ufs does not truncate).
* This function returns -1 if the file must be skipped, and
* updates save_orig_name if necessary.
* IN assertions: save_orig_name is already set if ofname has been
* already truncated because of NO_MULTIPLE_DOTS. The input file has
* already been open and istat is set.
*/
local int check_ofname()
{
int s = strlen(ofname);
struct stat ostat; /* stat for ofname */
if (stat(ofname, &ostat) != 0) return 0;
/* Check for name truncation on existing file: */
#ifdef NO_MULTIPLE_DOTS
if (!decompress && name_too_long(ofname, &ostat)) {
#else
if (!decompress && s > 8 && name_too_long(ofname, &ostat)) {
#endif
save_orig_name = 1;
#ifdef NO_MULTIPLE_DOTS
strcpy(ofname+s-Z_LEN-1, Z_SUFFIX); /* f.extz -> f.exz */
#else
strcpy(ofname+s-4, ".z"); /* 12345678901234.z -> 123456789012.z */
#endif
if (stat(ofname, &ostat) != 0) return 0;
} /* !decompress && name_too_long */
/* Check that the input and output files are different (could be
* the same by name truncation or links).
*/
if (same_file(&istat, &ostat)) {
fprintf(stderr, "%s: %s and %s are the same file\n",
progname, ifname, ofname);
exit_code = ERROR;
return -1;
}
/* Ask permission to overwrite the existing file */
if (!force) {
char response[80];
strcpy(response,"n");
fprintf(stderr, "%s: %s already exists;", progname, ofname);
if (foreground && isatty(fileno(stdin))) {
fprintf(stderr, " do you wish to overwrite (y or n)? ");
fflush(stderr);
(void)read(fileno(stdin), response, sizeof(response));
}
if (tolow(*response) != 'y') {
fprintf(stderr, "\tnot overwritten\n");
if (exit_code == OK) exit_code = WARNING;
return -1;
}
}
(void) chmod(ofname, 0777);
if (unlink(ofname)) {
fprintf(stderr, "%s: ", progname);
perror(ofname);
exit_code = ERROR;
return -1;
}
return 0;
}
/* ========================================================================
* Set the access and modification times from the given stat buffer.
*/
local void reset_times (name, statb)
char *name;
struct stat *statb;
{
#ifndef NO_UTIME
struct utimbuf timep;
/* Copy the time stamp */
timep.actime = statb->st_atime;
timep.modtime = statb->st_mtime;
if (utime(name, &timep)) {
WARN((stderr, "%s: ", progname));
if (!quiet) perror(ofname);
}
#else
name = name; statb = statb; /* avoid warnings */
#endif
}
/* ========================================================================
* Copy modes, times, ownership from input file to output file.
* IN assertion: to_stdout is false.
*/
local void copy_stat(ifstat)
struct stat *ifstat;
{
#ifndef NO_UTIME
time_t diff = ifstat->st_mtime - time_stamp;
if (diff < 0) diff = -diff;
if (decompress && diff > 60 && time_stamp != 0) {
ifstat->st_mtime = time_stamp;
if (verbose) {
fprintf(stderr, "%s: time stamp restored\n", ofname);
}
}
reset_times(ofname, ifstat);
#endif
/* Copy the protection modes */
if (chmod(ofname, ifstat->st_mode & 07777)) {
WARN((stderr, "%s: ", progname));
if (!quiet) perror(ofname);
}
#ifndef NO_CHOWN
chown(ofname, ifstat->st_uid, ifstat->st_gid); /* Copy ownership */
#endif
remove_ofname = 0;
/* It's now safe to remove the input file: */
(void) chmod(ifname, 0777);
if (unlink(ifname)) {
WARN((stderr, "%s: ", progname));
if (!quiet) perror(ifname);
}
}
#ifndef NO_DIR
/* ========================================================================
* Recurse through the given directory. This code is taken from ncompress.
*/
local void treat_dir(dir)
char *dir;
{
dir_type *dp;
DIR *dirp;
char nbuf[MAX_PATH_LEN];
dirp = opendir(dir);
if (dirp == NULL) {
fprintf(stderr, "%s: %s unreadable\n", progname, dir);
exit_code = ERROR;
return ;
}
/*
** WARNING: the following algorithm could occasionally cause
** compress to produce error warnings of the form "<filename>.z
** already has .z suffix - ignored". This occurs when the
** .z output file is inserted into the directory below
** readdir's current pointer.
** These warnings are harmless but annoying, so they are suppressed
** with option -r (except when -v is on). An alternative
** to allowing this would be to store the entire directory
** list in memory, then compress the entries in the stored
** list. Given the depth-first recursive algorithm used here,
** this could use up a tremendous amount of memory. I don't
** think it's worth it. -- Dave Mack
** (An other alternative might be two passes to avoid depth-first.)
*/
while ((dp = readdir(dirp)) != NULL) {
if (strequ(dp->d_name,".") || strequ(dp->d_name,"..")) {
continue;
}
if (((int)strlen(dir) + NLENGTH(dp) + 1) < (MAX_PATH_LEN - 1)) {
strcpy(nbuf,dir);
if (strlen(dir) != 0) { /* dir = "" means current dir on Amiga */
#ifdef OTHER_PATH_SEP
if (dir[strlen(dir)-1] != OTHER_PATH_SEP)
#endif
strcat(nbuf,"/");
}
strcat(nbuf,dp->d_name);
treat_file(nbuf);
} else {
fprintf(stderr,"%s: %s/%s: pathname too long\n",
progname, dir, dp->d_name);
exit_code = ERROR;
}
}
closedir(dirp);
}
#endif /* ? NO_DIR */
/* ========================================================================
* Free all dynamically allocated variables and exit with the given code.
*/
local void do_exit(exitcode)
int exitcode;
{
if (env != NULL) free(env), env = NULL;
if (args != NULL) free(args), args = NULL;
FREE(inbuf);
FREE(outbuf);
FREE(d_buf);
FREE(window);
#ifndef MAXSEG_64K
FREE(tab_prefix);
#else
FREE(tab_prefix0);
FREE(tab_prefix1);
#endif
exit(exitcode);
}
/* ========================================================================
* Signal and error handler.
*/
RETSIGTYPE abort_gzip()
{
if (remove_ofname) {
close(ofd);
unlink (ofname);
}
do_exit(ERROR);
}