+/* 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);
+}
projects / unix-history / commitdiff