www.pudn.com > gzip_win.zip > 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.gz: compressed file with same mode, owner, and utimes
* or stdout with -c option or if stdin used as input.
* If the output file name had to be truncated, the original name is kept
* in the compressed file.
* On MSDOS, file.tmp -> file.tmz. On VMS, file.tmp -> file.tmp-gz.
*
* Using gz on MSDOS would create too many file name conflicts. For
* example, foo.txt -> foo.tgz (.tgz must be reserved as shorthand for
* tar.gz). Similarly, foo.dir and foo.doc would both be mapped to foo.dgz.
* I also considered 12345678.txt -> 12345txt.gz but this truncates the name
* too heavily. There is no ideal solution given the MSDOS 8+3 limitation.
*
* For the meaning of all compilation flags, see comments in Makefile.in.
*/
#ifdef RCSID
static char rcsid[] = "$Id: gzip.c,v 0.24 1993/06/24 10:52:07 jloup Exp $";
#endif
#include
#include
#include
#include
#include
#include
#include "tailor.h"
#include "gzip.h"
#include "lzw.h"
#include "revision.h"
#include "getopt.h"
/* configuration */
#ifdef NO_TIME_H
# include
#else
# include
#endif
#ifndef NO_FCNTL_H
# include
#endif
#ifdef HAVE_UNISTD_H
# include
#endif
#if defined(STDC_HEADERS) || !defined(NO_STDLIB_H)
# include
#else
extern int errno;
#endif
#if defined(DIRENT)
# include
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
typedef struct direct dir_type;
# define DIR_OPT "SYSDIR"
# else
# ifdef SYSNDIR
# include
typedef struct direct dir_type;
# define DIR_OPT "SYSNDIR"
# else
# ifdef NDIR
# include
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
# define TIME_OPT "UTIME"
# else
# ifdef HAVE_SYS_UTIME_H
# include
# 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) OF((int));
#ifndef O_BINARY
# define O_BINARY 0 /* creation mode for open() */
#endif
#ifndef O_CREAT
/* Pure BSD system? */
# include
# ifndef O_CREAT
# define O_CREAT FCREAT
# endif
# ifndef O_EXCL
# define O_EXCL FEXCL
# endif
#endif
#ifndef S_IRUSR
# define S_IRUSR 0400
#endif
#ifndef S_IWUSR
# define S_IWUSR 0200
#endif
#define RW_USER (S_IRUSR | S_IWUSR) /* creation mode for open() */
#ifndef MAX_PATH_LEN
# define MAX_PATH_LEN 1024 /* max pathname length */
#endif
#ifndef SEEK_END
# define SEEK_END 2
#endif
#ifdef NO_OFF_T
typedef long off_t;
off_t lseek OF((int fd, off_t offset, int whence));
#endif
/* Separator for file name parts (see shorten_name()) */
#ifdef NO_MULTIPLE_DOTS
# define PART_SEP "-"
#else
# define PART_SEP "."
#endif
/* 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< 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) {
(void) signal (SIGINT, (sig_type)abort_gzip);
}
#ifdef SIGTERM
if (signal(SIGTERM, SIG_IGN) != SIG_IGN) {
(void) signal(SIGTERM, (sig_type)abort_gzip);
}
#endif
#ifdef SIGHUP
if (signal(SIGHUP, SIG_IGN) != SIG_IGN) {
(void) 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, gcat */
|| strequ(progname, "gzcat")) { /* gzcat */
decompress = to_stdout = 1;
}
#endif
strncpy(z_suffix, Z_SUFFIX, sizeof(z_suffix)-1);
z_len = strlen(z_suffix);
while ((optc = getopt_long (argc, argv, "ab:cdfhH?lLmMnNqrS:tvVZ123456789",
longopts, (int *)0)) != EOF) {
switch (optc) {
case 'a':
ascii = 1; break;
case 'b':
maxbits = atoi(optarg);
break;
case 'c':
to_stdout = 1; break;
case 'd':
decompress = 1; break;
case 'f':
force++; break;
case 'h': case 'H': case '?':
help(); do_exit(OK); break;
case 'l':
list = decompress = to_stdout = 1; break;
case 'L':
license(); do_exit(OK); break;
case 'm': /* undocumented, may change later */
no_time = 1; break;
case 'M': /* undocumented, may change later */
no_time = 0; break;
case 'n':
no_name = no_time = 1; break;
case 'N':
no_name = no_time = 0; 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 'S':
#ifdef NO_MULTIPLE_DOTS
if (*optarg == '.') optarg++;
#endif
z_len = strlen(optarg);
strcpy(z_suffix, optarg);
break;
case 't':
test = decompress = to_stdout = 1;
break;
case 'v':
verbose++; quiet = 0; break;
case 'V':
version(); do_exit(OK); 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 */
/* By default, save name and timestamp on compression but do not
* restore them on decompression.
*/
if (no_time < 0) no_time = decompress;
if (no_name < 0) no_name = decompress;
file_count = argc - optind;
#if O_BINARY
#else
if (ascii && !quiet) {
fprintf(stderr, "%s: option --ascii ignored on this system\n",
progname);
}
#endif
if ((z_len == 0 && !decompress) || z_len > MAX_SUFFIX) {
fprintf(stderr, "%s: incorrect suffix '%s'\n",
progname, optarg);
do_exit(ERROR);
}
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< 1) {
do_list(-1, -1); /* print totals */
}
time1 = timeGetTime();
printf("time: %d\n", time1-time0 );
do_exit(exit_code);
return exit_code; /* just to avoid lint warning */
}
/* ========================================================================
* Compress or decompress stdin
*/
local void treat_stdin()
{
if (!force && !list &&
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. According to the GNU standards:
*
* If there is one behavior you think is most useful when the output
* is to a terminal, and another that you think is most useful when
* the output is a file or a pipe, then it is usually best to make
* the default behavior the one that is useful with output to a
* terminal, and have an option for the other behavior.
*
* Here we use the --force option to get the other behavior.
*/
fprintf(stderr,
"%s: compressed data not %s a terminal. Use -f to force %scompression.\n",
progname, decompress ? "read from" : "written to",
decompress ? "de" : "");
fprintf(stderr,"For help, type: %s -h\n", progname);
do_exit(ERROR);
}
if (decompress || !ascii) {
SET_BINARY_MODE(fileno(stdin));
}
if (!test && !list && (!decompress || !ascii)) {
SET_BINARY_MODE(fileno(stdout));
}
strcpy(ifname, "stdin");
strcpy(ofname, "stdout");
/* Get the time stamp on the input file. */
time_stamp = 0; /* time unknown by default */
#ifndef NO_STDIN_FSTAT
if (list || !no_time) {
if (fstat(fileno(stdin), &istat) != 0) {
error("fstat(stdin)");
}
# ifdef NO_PIPE_TIMESTAMP
if (S_ISREG(istat.st_mode))
# endif
time_stamp = istat.st_mtime;
#endif /* NO_STDIN_FSTAT */
}
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 */
}
}
if (list) {
do_list(ifd, method);
return;
}
/* Actually do the compression/decompression. Loop over zipped members.
*/
for (;;) {
if ((*work)(fileno(stdin), fileno(stdout)) != OK) return;
if (!decompress || last_member || inptr == insize) break;
/* end of file */
method = get_method(ifd);
if (method < 0) return; /* error message already emitted */
bytes_out = 0; /* required for length check */
}
if (verbose) {
if (test) {
fprintf(stderr, " OK\n");
} else if (!decompress) {
display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
fprintf(stderr, "\n");
#ifdef DISPLAY_STDIN_RATIO
} else {
display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
fprintf(stderr, "\n");
#endif
}
}
}
/* ========================================================================
* Compress or decompress the given file
*/
local void treat_file(iname)
char *iname;
{
/* Accept "-" as synonym for stdin */
if (strequ(iname, "-")) {
int cflag = to_stdout;
treat_stdin();
to_stdout = cflag;
return;
}
/* Check if the input file is present, set ifname and istat: */
if (get_istat(iname, &istat) != OK) 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 */
# ifndef NO_UTIME
reset_times (iname, &st);
# endif
} 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 = no_time && !list ? 0 : istat.st_mtime;
/* Generate output file name. For -r and (-t or -l), skip files
* without a valid gzip suffix (check done in make_ofname).
*/
if (to_stdout && !list && !test) {
strcpy(ofname, "stdout");
} else if (make_ofname() != OK) {
return;
}
/* Open the input file and determine compression method. The mode
* parameter is ignored but required by some systems (VMS) and forbidden
* on other systems (MacOS).
*/
ifd = OPEN(ifname, ascii && !decompress ? O_RDONLY : O_RDONLY | O_BINARY,
RW_USER);
if (ifd == -1) {
fprintf(stderr, "%s: ", progname);
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 (list) {
do_list(ifd, method);
close(ifd);
return;
}
/* 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() != OK) return;
if (!decompress && save_orig_name && !verbose && !quiet) {
fprintf(stderr, "%s: %s compressed to %s\n",
progname, ifname, ofname);
}
}
/* Keep the name even if not truncated except with --no-name: */
if (!save_orig_name) save_orig_name = !no_name;
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 (;;) {
if ((*work)(ifd, ofd) != OK) {
method = -1; /* force cleanup */
break;
}
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) {
if (!to_stdout) unlink (ofname);
return;
}
/* Display statistics */
if(verbose) {
if (test) {
fprintf(stderr, " OK");
} else if (decompress) {
display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
} else {
display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
}
if (!test && !to_stdout) {
fprintf(stderr, " -- replaced with %s", ofname);
}
fprintf(stderr, "\n");
}
/* Copy modes, times, ownership, and remove the input file */
if (!to_stdout) {
copy_stat(&istat);
}
}
/* ========================================================================
* Create the output file. Return OK or ERROR.
* Try several times if necessary to avoid truncating the z_suffix. For
* example, do not create a compressed file of name "1234567890123."
* Sets save_orig_name to true if the file name has been truncated.
* 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 flags = O_WRONLY | O_CREAT | O_EXCL | O_BINARY;
if (ascii && decompress) {
flags &= ~O_BINARY; /* force ascii text mode */
}
for (;;) {
/* Make sure that ofname is not an existing file */
if (check_ofname() != OK) {
close(ifd);
return ERROR;
}
/* Create the output file */
remove_ofname = 1;
ofd = OPEN(ofname, flags, RW_USER);
if (ofd == -1) {
perror(ofname);
close(ifd);
exit_code = ERROR;
return ERROR;
}
/* Check for name truncation on new file (1234567890123.gz) */
#ifdef NO_FSTAT
if (stat(ofname, &ostat) != 0) {
#else
if (fstat(ofd, &ostat) != 0) {
#endif
fprintf(stderr, "%s: ", progname);
perror(ofname);
close(ifd); close(ofd);
unlink(ofname);
exit_code = ERROR;
return ERROR;
}
if (!name_too_long(ofname, &ostat)) return OK;
if (decompress) {
/* name might be too long if an original name was saved */
WARN((stderr, "%s: %s: warning, name truncated\n",
progname, ofname));
return OK;
}
close(ofd);
unlink(ofname);
#ifdef NO_MULTIPLE_DOTS
/* Should never happen, see check_ofname() */
fprintf(stderr, "%s: %s: name too long\n", progname, ofname);
do_exit(ERROR);
#endif
shorten_name(ofname);
}
}
/* ========================================================================
* 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;
{
errno = 0;
#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, ".gz", ".z", ".Z", ".taz", ".tgz", "-gz", "-z" and "_z" are
* accepted suffixes, in addition to the value of the --suffix option.
* ".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.
* On systems allowing multiple versions of the same file (such as VMS),
* this function removes any version suffix in the given name.
*/
local char *get_suffix(name)
char *name;
{
int nlen, slen;
char suffix[MAX_SUFFIX+3]; /* last chars of name, forced to lower case */
static char *known_suffixes[] =
{z_suffix, ".gz", ".z", ".taz", ".tgz", "-gz", "-z", "_z",
#ifdef MAX_EXT_CHARS
"z",
#endif
NULL};
char **suf = known_suffixes;
if (strequ(z_suffix, "z")) suf++; /* check long suffixes first */
#ifdef SUFFIX_SEP
/* strip a version number from the file name */
{
char *v = strrchr(name, SUFFIX_SEP);
if (v != NULL) *v = '\0';
}
#endif
nlen = strlen(name);
if (nlen <= MAX_SUFFIX+2) {
strcpy(suffix, name);
} else {
strcpy(suffix, name+nlen-MAX_SUFFIX-2);
}
strlwr(suffix);
slen = strlen(suffix);
do {
int s = strlen(*suf);
if (slen > s && suffix[slen-s-1] != PATH_SEP
&& strequ(suffix + slen - s, *suf)) {
return name+nlen-s;
}
} while (*++suf != NULL);
return NULL;
}
/* ========================================================================
* Set ifname to the input file name (with a suffix appended if necessary)
* and istat to its stats. For decompression, if no file exists with the
* original name, try adding successively z_suffix, .gz, .z, -z and .Z.
* For MSDOS, we try only z_suffix and z.
* Return OK or ERROR.
*/
local int get_istat(iname, sbuf)
char *iname;
struct stat *sbuf;
{
int ilen; /* strlen(ifname) */
static char *suffixes[] = {z_suffix, ".gz", ".z", "-z", ".Z", NULL};
char **suf = suffixes;
char *s;
#ifdef NO_MULTIPLE_DOTS
char *dot; /* pointer to ifname extension, or NULL */
#endif
strcpy(ifname, iname);
/* If input file exists, return OK. */
if (do_stat(ifname, sbuf) == 0) return OK;
if (!decompress || errno != ENOENT) {
perror(ifname);
exit_code = ERROR;
return ERROR;
}
/* file.ext doesn't exist, try adding a suffix (after removing any
* version number for VMS).
*/
s = get_suffix(ifname);
if (s != NULL) {
perror(ifname); /* ifname already has z suffix and does not exist */
exit_code = ERROR;
return ERROR;
}
#ifdef NO_MULTIPLE_DOTS
dot = strrchr(ifname, '.');
if (dot == NULL) {
strcat(ifname, ".");
dot = strrchr(ifname, '.');
}
#endif
ilen = strlen(ifname);
if (strequ(z_suffix, ".gz")) suf++;
/* Search for all suffixes */
do {
s = *suf;
#ifdef NO_MULTIPLE_DOTS
if (*s == '.') s++;
#endif
#ifdef MAX_EXT_CHARS
strcpy(ifname, iname);
/* Needed if the suffixes are not sorted by increasing length */
if (*dot == '\0') strcpy(dot, ".");
dot[MAX_EXT_CHARS+1-strlen(s)] = '\0';
#endif
strcat(ifname, s);
if (do_stat(ifname, sbuf) == 0) return OK;
ifname[ilen] = '\0';
} while (*++suf != NULL);
/* No suffix found, complain using z_suffix: */
#ifdef MAX_EXT_CHARS
strcpy(ifname, iname);
if (*dot == '\0') strcpy(dot, ".");
dot[MAX_EXT_CHARS+1-z_len] = '\0';
#endif
strcat(ifname, z_suffix);
perror(ifname);
exit_code = ERROR;
return ERROR;
}
/* ========================================================================
* Generate ofname given ifname. Return OK, or WARNING if file must be skipped.
* Sets save_orig_name to true if the file name has been truncated.
*/
local int make_ofname()
{
char *suff; /* ofname z suffix */
strcpy(ofname, ifname);
/* strip a version number if any and get the gzip suffix if present: */
suff = get_suffix(ofname);
if (decompress) {
if (suff == NULL) {
/* Whith -t or -l, try all files (even without .gz suffix)
* except with -r (behave as with just -dr).
*/
if (!recursive && (list || test)) return OK;
/* Avoid annoying messages with -r */
if (verbose || (!recursive && !quiet)) {
WARN((stderr,"%s: %s: unknown suffix -- ignored\n",
progname, ifname));
}
return WARNING;
}
/* Make a special case for .tgz and .taz: */
strlwr(suff);
if (strequ(suff, ".tgz") || strequ(suff, ".taz")) {
strcpy(suff, ".tar");
} else {
*suff = '\0'; /* strip the z suffix */
}
/* 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 WARNING;
} else {
save_orig_name = 0;
#ifdef NO_MULTIPLE_DOTS
suff = strrchr(ofname, '.');
if (suff == NULL) {
strcat(ofname, ".");
# ifdef MAX_EXT_CHARS
if (strequ(z_suffix, "z")) {
strcat(ofname, "gz"); /* enough room */
return OK;
}
/* 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.
*/
} else if (strlen(suff)-1 + z_len > MAX_SUFFIX) {
suff[MAX_SUFFIX+1-z_len] = '\0';
save_orig_name = 1;
# endif
}
#endif /* NO_MULTIPLE_DOTS */
strcat(ofname, z_suffix);
} /* decompress ? */
return OK;
}
/* ========================================================================
* 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.
* Updates time_stamp if there is one and --no-time is not used.
* 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; /* compression flags */
char magic[2]; /* magic header */
ulg stamp; /* time stamp */
/* If --force and --stdout, zcat == cat, so do not complain about
* premature end of file: use try_byte instead of get_byte.
*/
if (force && to_stdout) {
magic[0] = (char)try_byte();
magic[1] = (char)try_byte();
/* If try_byte returned EOF, magic[1] == 0xff */
} else {
magic[0] = (char)get_byte();
magic[1] = (char)get_byte();
}
method = -1; /* unknown yet */
part_nb++; /* number of parts in gzip file */
header_bytes = 0;
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) {
method = (int)get_byte();
if (method != DEFLATED) {
fprintf(stderr,
"%s: %s: unknown method %d -- get newer version of gzip\n",
progname, ifname, method);
exit_code = ERROR;
return -1;
}
work = unzip;
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;
}
stamp = (ulg)get_byte();
stamp |= ((ulg)get_byte()) << 8;
stamp |= ((ulg)get_byte()) << 16;
stamp |= ((ulg)get_byte()) << 24;
if (stamp != 0 && !no_time) time_stamp = stamp;
(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 (no_name || (to_stdout && !list) || part_nb > 1) {
/* Discard the old name */
char c; /* dummy used for NeXTstep 3.0 cc optimizer bug */
do {c=get_byte();} while (c != 0);
} else {
/* Copy the base name. Keep a directory prefix intact. */
char *p = basename(ofname);
char *base = p;
for (;;) {
*p = (char)get_char();
if (*p++ == '\0') break;
if (p >= ofname+sizeof(ofname)) {
error("corrupted input -- file name too large");
}
}
/* If necessary, adapt the name to local OS conventions: */
if (!list) {
MAKE_LEGAL_NAME(base);
if (base) list=0; /* avoid warning about unused variable */
}
} /* no_name || to_stdout */
} /* ORIG_NAME */
/* Discard file comment if any */
if ((flags & COMMENT) != 0) {
while (get_char() != 0) /* null */ ;
}
if (part_nb == 1) {
header_bytes = inptr + 2*sizeof(long); /* include crc and size */
}
} else if (memcmp(magic, PKZIP_MAGIC, 2) == 0 && inptr == 2
&& memcmp((char*)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) != OK) 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;
} else if (memcmp(magic, LZH_MAGIC, 2) == 0) {
work = unlzh;
method = LZHED;
last_member = 1;
} else if (force && to_stdout && !list) { /* pass input unchanged */
method = STORED;
work = copy;
inptr = 0;
last_member = 1;
}
if (method >= 0) return method;
if (part_nb == 1) {
fprintf(stderr, "\n%s: %s: not in gzip format\n", progname, ifname);
exit_code = ERROR;
return -1;
} else {
WARN((stderr, "\n%s: %s: decompression OK, trailing garbage ignored\n",
progname, ifname));
return -2;
}
}
/* ========================================================================
* Display the characteristics of the compressed file.
* If the given method is < 0, display the accumulated totals.
* IN assertions: time_stamp, header_bytes and ifile_size are initialized.
*/
local void do_list(ifd, method)
int ifd; /* input file descriptor */
int method; /* compression method */
{
ulg crc; /* original crc */
static int first_time = 1;
static char* methods[MAX_METHODS] = {
"store", /* 0 */
"compr", /* 1 */
"pack ", /* 2 */
"lzh ", /* 3 */
"", "", "", "", /* 4 to 7 reserved */
"defla"}; /* 8 */
char *date;
if (first_time && method >= 0) {
first_time = 0;
if (verbose) {
printf("method crc date time ");
}
if (!quiet) {
printf("compressed uncompr. ratio uncompressed_name\n");
}
} else if (method < 0) {
if (total_in <= 0 || total_out <= 0) return;
if (verbose) {
printf(" %9lu %9lu ",
total_in, total_out);
} else if (!quiet) {
printf("%9ld %9ld ", total_in, total_out);
}
display_ratio(total_out-(total_in-header_bytes), total_out, stdout);
/* header_bytes is not meaningful but used to ensure the same
* ratio if there is a single file.
*/
printf(" (totals)\n");
return;
}
crc = (ulg)~0; /* unknown */
bytes_out = -1L;
bytes_in = ifile_size;
#if RECORD_IO == 0
if (method == DEFLATED && !last_member) {
/* Get the crc and uncompressed size for gzip'ed (not zip'ed) files.
* If the lseek fails, we could use read() to get to the end, but
* --list is used to get quick results.
* Use "gunzip < foo.gz | wc -c" to get the uncompressed size if
* you are not concerned about speed.
*/
bytes_in = (long)lseek(ifd, (off_t)(-8), SEEK_END);
if (bytes_in != -1L) {
uch buf[8];
bytes_in += 8L;
if (read(ifd, (char*)buf, sizeof(buf)) != sizeof(buf)) {
read_error();
}
crc = LG(buf);
bytes_out = LG(buf+4);
}
}
#endif /* RECORD_IO */
date = ctime((time_t*)&time_stamp) + 4; /* skip the day of the week */
date[12] = '\0'; /* suppress the 1/100sec and the year */
if (verbose) {
printf("%5s %08lx %11s ", methods[method], crc, date);
}
printf("%9ld %9ld ", bytes_in, bytes_out);
if (bytes_in == -1L) {
total_in = -1L;
bytes_in = bytes_out = header_bytes = 0;
} else if (total_in >= 0) {
total_in += bytes_in;
}
if (bytes_out == -1L) {
total_out = -1L;
bytes_in = bytes_out = header_bytes = 0;
} else if (total_out >= 0) {
total_out += bytes_out;
}
display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out, stdout);
printf(" %s\n", ofname);
}
/* ========================================================================
* 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_ino == stat2->st_ino
&& stat1->st_dev == stat2->st_dev
#ifdef NO_ST_INO
/* Can't rely on st_ino and st_dev, use other fields: */
&& stat1->st_mode == stat2->st_mode
&& 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
#endif
;
}
/* ========================================================================
* 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;
Trace((stderr, " too_long(%s) => %d\n", name, res));
return res;
}
/* ========================================================================
* Shorten the given name by one character, or replace a .tar extension
* with .tgz. Truncate the last part of the name which is longer than
* MIN_PART characters: 1234.678.012.gz -> 123.678.012.gz. If the name
* has only parts shorter than MIN_PART truncate the longest part.
* For decompression, just remove the last character of the name.
*
* IN assertion: for compression, the suffix of the given name is z_suffix.
*/
local void shorten_name(name)
char *name;
{
int len; /* length of name without z_suffix */
char *trunc = NULL; /* character to be truncated */
int plen; /* current part length */
int min_part = MIN_PART; /* current minimum part length */
char *p;
len = strlen(name);
if (decompress) {
if (len <= 1) error("name too short");
name[len-1] = '\0';
return;
}
p = get_suffix(name);
if (p == NULL) error("can't recover suffix\n");
*p = '\0';
save_orig_name = 1;
/* compress 1234567890.tar to 1234567890.tgz */
if (len > 4 && strequ(p-4, ".tar")) {
strcpy(p-4, ".tgz");
return;
}
/* Try keeping short extensions intact:
* 1234.678.012.gz -> 123.678.012.gz
*/
do {
p = strrchr(name, PATH_SEP);
p = p ? p+1 : name;
while (*p) {
plen = strcspn(p, PART_SEP);
p += plen;
if (plen > min_part) trunc = p-1;
if (*p) p++;
}
} while (trunc == NULL && --min_part != 0);
if (trunc != NULL) {
do {
trunc[0] = trunc[1];
} while (*trunc++);
trunc--;
} else {
trunc = strrchr(name, PART_SEP[0]);
if (trunc == NULL) error("internal error in shorten_name");
if (trunc[1] == '\0') trunc--; /* force truncation */
}
strcpy(trunc, z_suffix);
}
/* ========================================================================
* 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 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()
{
struct stat ostat; /* stat for ofname */
#ifdef ENAMETOOLONG
/* Check for strictly conforming Posix systems (which return ENAMETOOLONG
* instead of silently truncating filenames).
*/
errno = 0;
while (stat(ofname, &ostat) != 0) {
if (errno != ENAMETOOLONG) return 0; /* ofname does not exist */
shorten_name(ofname);
}
#else
if (stat(ofname, &ostat) != 0) return 0;
#endif
/* Check for name truncation on existing file. Do this even on systems
* defining ENAMETOOLONG, because on most systems the strict Posix
* behavior is disabled by default (silent name truncation allowed).
*/
if (!decompress && name_too_long(ofname, &ostat)) {
shorten_name(ofname);
if (stat(ofname, &ostat) != 0) return 0;
}
/* Check that the input and output files are different (could be
* the same by name truncation or links).
*/
if (same_file(&istat, &ostat)) {
if (strequ(ifname, ofname)) {
fprintf(stderr, "%s: %s: cannot %scompress onto itself\n",
progname, ifname, decompress ? "de" : "");
} else {
fprintf(stderr, "%s: %s and %s are the same file\n",
progname, ifname, ofname);
}
exit_code = ERROR;
return ERROR;
}
/* 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)fgets(response, sizeof(response)-1, stdin);
}
if (tolow(*response) != 'y') {
fprintf(stderr, "\tnot overwritten\n");
if (exit_code == OK) exit_code = WARNING;
return ERROR;
}
}
(void) chmod(ofname, 0777);
if (unlink(ofname)) {
fprintf(stderr, "%s: ", progname);
perror(ofname);
exit_code = ERROR;
return ERROR;
}
return OK;
}
#ifndef NO_UTIME
/* ========================================================================
* Set the access and modification times from the given stat buffer.
*/
local void reset_times (name, statb)
char *name;
struct stat *statb;
{
struct utimbuf timep;
/* Copy the time stamp */
timep.actime = statb->st_atime;
timep.modtime = statb->st_mtime;
/* Some systems (at least OS/2) do not support utime on directories */
if (utime(name, &timep) && !S_ISDIR(statb->st_mode)) {
WARN((stderr, "%s: ", progname));
if (!quiet) perror(ofname);
}
}
#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
if (decompress && time_stamp != 0 && ifstat->st_mtime != time_stamp) {
ifstat->st_mtime = time_stamp;
if (verbose > 1) {
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: */
/* DO NOT REMOVE THE ORIGINAL FILE - REG
(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];
int 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 ".gz
** already has .gz suffix - ignored". This occurs when the
** .gz 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;
}
len = strlen(dir);
if (len + NLENGTH(dp) + 1 < MAX_PATH_LEN - 1) {
strcpy(nbuf,dir);
if (len != 0 /* dir = "" means current dir on Amiga */
#ifdef PATH_SEP2
&& dir[len-1] != PATH_SEP2
#endif
#ifdef PATH_SEP3
&& dir[len-1] != PATH_SEP3
#endif
) {
nbuf[len++] = PATH_SEP;
}
strcpy(nbuf+len, 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;
{
static int in_exit = 0;
if (in_exit) exit(exitcode);
in_exit = 1;
if (env != NULL) free(env), env = NULL;
if (args != NULL) free((char*)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);
}