1750 lines
51 KiB
C
1750 lines
51 KiB
C
/* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
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* Copyright (C) 1992-1993 Jean-loup Gailly
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* The unzip code was written and put in the public domain by Mark Adler.
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* Portions of the lzw code are derived from the public domain 'compress'
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* written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
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* Ken Turkowski, Dave Mack and Peter Jannesen.
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*
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* See the license_msg below and the file COPYING for the software license.
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* See the file algorithm.doc for the compression algorithms and file formats.
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*/
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static char *license_msg[] = {
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" Copyright (C) 1992-1993 Jean-loup Gailly",
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" This program is free software; you can redistribute it and/or modify",
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" it under the terms of the GNU General Public License as published by",
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" the Free Software Foundation; either version 2, or (at your option)",
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" any later version.",
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"",
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" This program is distributed in the hope that it will be useful,",
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" but WITHOUT ANY WARRANTY; without even the implied warranty of",
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" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the",
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" GNU General Public License for more details.",
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"",
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" You should have received a copy of the GNU General Public License",
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" along with this program; if not, write to the Free Software",
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" Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.",
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0};
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/* Compress files with zip algorithm and 'compress' interface.
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* See usage() and help() functions below for all options.
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* Outputs:
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* file.gz: compressed file with same mode, owner, and utimes
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* or stdout with -c option or if stdin used as input.
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* If the output file name had to be truncated, the original name is kept
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* in the compressed file.
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* On MSDOS, file.tmp -> file.tmz. On VMS, file.tmp -> file.tmp-gz.
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*
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* Using gz on MSDOS would create too many file name conflicts. For
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* example, foo.txt -> foo.tgz (.tgz must be reserved as shorthand for
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* tar.gz). Similarly, foo.dir and foo.doc would both be mapped to foo.dgz.
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* I also considered 12345678.txt -> 12345txt.gz but this truncates the name
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* too heavily. There is no ideal solution given the MSDOS 8+3 limitation.
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*
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* For the meaning of all compilation flags, see comments in Makefile.in.
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*/
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#ifdef RCSID
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static char rcsid[] = "$Id: gzip.c,v 1.7 1997/03/15 22:43:58 guido Exp $";
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#endif
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#include <ctype.h>
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#include <sys/types.h>
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#include <signal.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include "tailor.h"
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#include "gzip.h"
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#include "lzw.h"
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#include "revision.h"
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#include "getopt.h"
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/* configuration */
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#ifdef NO_TIME_H
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# include <sys/time.h>
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#else
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# include <time.h>
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#endif
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#ifndef NO_FCNTL_H
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# include <fcntl.h>
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#endif
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#if defined(STDC_HEADERS) || !defined(NO_STDLIB_H)
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# include <stdlib.h>
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#else
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extern int errno;
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#endif
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#if defined(DIRENT)
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# include <dirent.h>
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typedef struct dirent dir_type;
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# define NLENGTH(dirent) ((int)strlen((dirent)->d_name))
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# define DIR_OPT "DIRENT"
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#else
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# define NLENGTH(dirent) ((dirent)->d_namlen)
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# ifdef SYSDIR
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# include <sys/dir.h>
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typedef struct direct dir_type;
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# define DIR_OPT "SYSDIR"
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# else
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# ifdef SYSNDIR
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# include <sys/ndir.h>
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typedef struct direct dir_type;
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# define DIR_OPT "SYSNDIR"
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# else
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# ifdef NDIR
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# include <ndir.h>
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typedef struct direct dir_type;
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# define DIR_OPT "NDIR"
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# else
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# define NO_DIR
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# define DIR_OPT "NO_DIR"
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# endif
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# endif
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# endif
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#endif
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#ifndef NO_UTIME
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# ifndef NO_UTIME_H
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# include <utime.h>
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# define TIME_OPT "UTIME"
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# else
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# ifdef HAVE_SYS_UTIME_H
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# include <sys/utime.h>
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# define TIME_OPT "SYS_UTIME"
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# else
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struct utimbuf {
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time_t actime;
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time_t modtime;
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};
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# define TIME_OPT ""
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# endif
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# endif
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#else
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# define TIME_OPT "NO_UTIME"
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#endif
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#if !defined(S_ISDIR) && defined(S_IFDIR)
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# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
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#endif
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#if !defined(S_ISREG) && defined(S_IFREG)
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# define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
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#endif
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typedef RETSIGTYPE (*sig_type) OF((int));
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#ifndef O_BINARY
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# define O_BINARY 0 /* creation mode for open() */
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#endif
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#ifndef O_CREAT
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/* Pure BSD system? */
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# include <sys/file.h>
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# ifndef O_CREAT
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# define O_CREAT FCREAT
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# endif
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# ifndef O_EXCL
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# define O_EXCL FEXCL
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# endif
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#endif
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#ifndef S_IRUSR
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# define S_IRUSR 0400
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#endif
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#ifndef S_IWUSR
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# define S_IWUSR 0200
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#endif
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#define RW_USER (S_IRUSR | S_IWUSR) /* creation mode for open() */
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#ifndef MAX_PATH_LEN
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# define MAX_PATH_LEN 1024 /* max pathname length */
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#endif
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#ifndef SEEK_END
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# define SEEK_END 2
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#endif
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#ifdef NO_OFF_T
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typedef long off_t;
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off_t lseek OF((int fd, off_t offset, int whence));
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#endif
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/* Separator for file name parts (see shorten_name()) */
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#ifdef NO_MULTIPLE_DOTS
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# define PART_SEP "-"
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#else
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# define PART_SEP "."
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#endif
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/* global buffers */
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DECLARE(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
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DECLARE(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
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DECLARE(ush, d_buf, DIST_BUFSIZE);
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DECLARE(uch, window, 2L*WSIZE);
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#ifndef MAXSEG_64K
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DECLARE(ush, tab_prefix, 1L<<BITS);
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#else
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DECLARE(ush, tab_prefix0, 1L<<(BITS-1));
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DECLARE(ush, tab_prefix1, 1L<<(BITS-1));
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#endif
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/* local variables */
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int ascii = 0; /* convert end-of-lines to local OS conventions */
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int to_stdout = 0; /* output to stdout (-c) */
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int decompress = 0; /* decompress (-d) */
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int force = 0; /* don't ask questions, compress links (-f) */
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int no_name = -1; /* don't save or restore the original file name */
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int no_time = -1; /* don't save or restore the original file time */
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int recursive = 0; /* recurse through directories (-r) */
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int list = 0; /* list the file contents (-l) */
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int verbose = 0; /* be verbose (-v) */
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int quiet = 0; /* be very quiet (-q) */
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int do_lzw = 0; /* generate output compatible with old compress (-Z) */
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int test = 0; /* test .gz file integrity */
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int foreground; /* set if program run in foreground */
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char *progname; /* program name */
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int maxbits = BITS; /* max bits per code for LZW */
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int method = DEFLATED;/* compression method */
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int level = 6; /* compression level */
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int exit_code = OK; /* program exit code */
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int save_orig_name; /* set if original name must be saved */
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int last_member; /* set for .zip and .Z files */
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int part_nb; /* number of parts in .gz file */
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long time_stamp; /* original time stamp (modification time) */
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long ifile_size; /* input file size, -1 for devices (debug only) */
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char *env; /* contents of GZIP env variable */
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char **args = NULL; /* argv pointer if GZIP env variable defined */
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char z_suffix[MAX_SUFFIX+1]; /* default suffix (can be set with --suffix) */
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int z_len; /* strlen(z_suffix) */
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long bytes_in; /* number of input bytes */
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long bytes_out; /* number of output bytes */
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long total_in = 0; /* input bytes for all files */
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long total_out = 0; /* output bytes for all files */
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char ifname[MAX_PATH_LEN]; /* input file name */
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char ofname[MAX_PATH_LEN]; /* output file name */
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int remove_ofname = 0; /* remove output file on error */
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struct stat istat; /* status for input file */
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int ifd; /* input file descriptor */
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int ofd; /* output file descriptor */
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unsigned insize; /* valid bytes in inbuf */
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unsigned inptr; /* index of next byte to be processed in inbuf */
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unsigned outcnt; /* bytes in output buffer */
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struct option longopts[] =
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{
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/* { name has_arg *flag val } */
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{"ascii", 0, 0, 'a'}, /* ascii text mode */
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{"to-stdout", 0, 0, 'c'}, /* write output on standard output */
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{"stdout", 0, 0, 'c'}, /* write output on standard output */
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{"decompress", 0, 0, 'd'}, /* decompress */
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{"uncompress", 0, 0, 'd'}, /* decompress */
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/* {"encrypt", 0, 0, 'e'}, encrypt */
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{"force", 0, 0, 'f'}, /* force overwrite of output file */
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{"help", 0, 0, 'h'}, /* give help */
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/* {"pkzip", 0, 0, 'k'}, force output in pkzip format */
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{"list", 0, 0, 'l'}, /* list .gz file contents */
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{"license", 0, 0, 'L'}, /* display software license */
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{"no-name", 0, 0, 'n'}, /* don't save or restore original name & time */
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{"name", 0, 0, 'N'}, /* save or restore original name & time */
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{"quiet", 0, 0, 'q'}, /* quiet mode */
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{"silent", 0, 0, 'q'}, /* quiet mode */
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{"recursive", 0, 0, 'r'}, /* recurse through directories */
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{"suffix", 1, 0, 'S'}, /* use given suffix instead of .gz */
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{"test", 0, 0, 't'}, /* test compressed file integrity */
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{"no-time", 0, 0, 'T'}, /* don't save or restore the time stamp */
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{"verbose", 0, 0, 'v'}, /* verbose mode */
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{"version", 0, 0, 'V'}, /* display version number */
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{"fast", 0, 0, '1'}, /* compress faster */
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{"best", 0, 0, '9'}, /* compress better */
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{"lzw", 0, 0, 'Z'}, /* make output compatible with old compress */
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{"bits", 1, 0, 'b'}, /* max number of bits per code (implies -Z) */
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{ 0, 0, 0, 0 }
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};
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/* local functions */
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local void usage OF((void));
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local void help OF((void));
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local void license OF((void));
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local void version OF((void));
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local void treat_stdin OF((void));
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local void treat_file OF((char *iname));
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local int create_outfile OF((void));
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local int do_stat OF((char *name, struct stat *sbuf));
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local char *get_suffix OF((char *name));
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local int get_istat OF((char *iname, struct stat *sbuf));
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local int make_ofname OF((void));
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local int same_file OF((struct stat *stat1, struct stat *stat2));
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local int name_too_long OF((char *name, struct stat *statb));
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local void shorten_name OF((char *name));
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local int get_method OF((int in));
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local void do_list OF((int ifd, int method));
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local int check_ofname OF((void));
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local void copy_stat OF((struct stat *ifstat));
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local void do_exit OF((int exitcode));
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int main OF((int argc, char **argv));
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int (*work) OF((int infile, int outfile)) = zip; /* function to call */
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#ifndef NO_DIR
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local void treat_dir OF((char *dir));
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#endif
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#ifndef NO_UTIME
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local void reset_times OF((char *name, struct stat *statb));
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#endif
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#define strequ(s1, s2) (strcmp((s1),(s2)) == 0)
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/* ======================================================================== */
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local void usage()
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{
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fprintf(stderr, "usage: %s [-%scdfhlLnN%stvV19] [-S suffix] [file ...]\n",
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progname,
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#if O_BINARY
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"a",
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#else
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"",
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#endif
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#ifdef NO_DIR
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""
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#else
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"r"
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#endif
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);
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}
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/* ======================================================================== */
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local void help()
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{
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static char *help_msg[] = {
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#if O_BINARY
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" -a --ascii ascii text; convert end-of-lines using local conventions",
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#endif
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" -c --stdout write on standard output, keep original files unchanged",
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" -d --decompress decompress",
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/* -e --encrypt encrypt */
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" -f --force force overwrite of output file and compress links",
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" -h --help give this help",
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/* -k --pkzip force output in pkzip format */
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" -l --list list compressed file contents",
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" -L --license display software license",
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#ifdef UNDOCUMENTED
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" -m --no-time do not save or restore the original modification time",
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" -M --time save or restore the original modification time",
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#endif
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" -n --no-name do not save or restore the original name and time stamp",
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" -N --name save or restore the original name and time stamp",
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" -q --quiet suppress all warnings",
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#ifndef NO_DIR
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" -r --recursive operate recursively on directories",
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#endif
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" -S .suf --suffix .suf use suffix .suf on compressed files",
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" -t --test test compressed file integrity",
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" -v --verbose verbose mode",
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" -V --version display version number",
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" -1 --fast compress faster",
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" -9 --best compress better",
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#ifdef LZW
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" -Z --lzw produce output compatible with old compress",
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" -b --bits maxbits max number of bits per code (implies -Z)",
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#endif
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" file... files to (de)compress. If none given, use standard input.",
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0};
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char **p = help_msg;
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fprintf(stderr,"%s %s (%s)\n", progname, VERSION, REVDATE);
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usage();
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while (*p) fprintf(stderr, "%s\n", *p++);
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}
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/* ======================================================================== */
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local void license()
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{
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char **p = license_msg;
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fprintf(stderr,"%s %s (%s)\n", progname, VERSION, REVDATE);
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while (*p) fprintf(stderr, "%s\n", *p++);
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}
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/* ======================================================================== */
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local void version()
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{
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fprintf(stderr,"%s %s (%s)\n", progname, VERSION, REVDATE);
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fprintf(stderr, "Compilation options:\n%s %s ", DIR_OPT, TIME_OPT);
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#ifdef STDC_HEADERS
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fprintf(stderr, "STDC_HEADERS ");
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#endif
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#ifdef HAVE_UNISTD_H
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fprintf(stderr, "HAVE_UNISTD_H ");
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#endif
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#ifdef NO_MEMORY_H
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fprintf(stderr, "NO_MEMORY_H ");
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#endif
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#ifdef NO_STRING_H
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fprintf(stderr, "NO_STRING_H ");
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#endif
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#ifdef NO_SYMLINK
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fprintf(stderr, "NO_SYMLINK ");
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#endif
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#ifdef NO_MULTIPLE_DOTS
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fprintf(stderr, "NO_MULTIPLE_DOTS ");
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#endif
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#ifdef NO_CHOWN
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fprintf(stderr, "NO_CHOWN ");
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#endif
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#ifdef PROTO
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fprintf(stderr, "PROTO ");
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#endif
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#ifdef ASMV
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fprintf(stderr, "ASMV ");
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#endif
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#ifdef DEBUG
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fprintf(stderr, "DEBUG ");
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#endif
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#ifdef DYN_ALLOC
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fprintf(stderr, "DYN_ALLOC ");
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#endif
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#ifdef MAXSEG_64K
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fprintf(stderr, "MAXSEG_64K");
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#endif
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fprintf(stderr, "\n");
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}
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/* ======================================================================== */
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int main (argc, argv)
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int argc;
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char **argv;
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{
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int file_count; /* number of files to precess */
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int proglen; /* length of progname */
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int optc; /* current option */
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EXPAND(argc, argv); /* wild card expansion if necessary */
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progname = basename(argv[0]);
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proglen = strlen(progname);
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/* Suppress .exe for MSDOS, OS/2 and VMS: */
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if (proglen > 4 && strequ(progname+proglen-4, ".exe")) {
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progname[proglen-4] = '\0';
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}
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/* Add options in GZIP environment variable if there is one */
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env = add_envopt(&argc, &argv, OPTIONS_VAR);
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if (env != NULL) args = argv;
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foreground = signal(SIGINT, SIG_IGN) != SIG_IGN;
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if (foreground) {
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(void) signal (SIGINT, (sig_type)abort_gzip);
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}
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#ifdef SIGTERM
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if (signal(SIGTERM, SIG_IGN) != SIG_IGN) {
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(void) signal(SIGTERM, (sig_type)abort_gzip);
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}
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#endif
|
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#ifdef SIGHUP
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if (signal(SIGHUP, SIG_IGN) != SIG_IGN) {
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(void) signal(SIGHUP, (sig_type)abort_gzip);
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}
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#endif
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#ifndef GNU_STANDARD
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/* For compatibility with old compress, use program name as an option.
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* If you compile with -DGNU_STANDARD, this program will behave as
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* gzip even if it is invoked under the name gunzip or zcat.
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*
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* Systems which do not support links can still use -d or -dc.
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* Ignore an .exe extension for MSDOS, OS/2 and VMS.
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*/
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if ( strncmp(progname, "un", 2) == 0 /* ungzip, uncompress */
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|| strncmp(progname, "gun", 3) == 0) { /* gunzip */
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decompress = 1;
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} else if (strequ(progname+1, "cat") /* zcat, pcat, gcat */
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|| strequ(progname, "gzcat")) { /* gzcat */
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decompress = to_stdout = 1;
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}
|
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#endif
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|
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strncpy(z_suffix, Z_SUFFIX, sizeof(z_suffix)-1);
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z_len = strlen(z_suffix);
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|
|
|
while ((optc = getopt_long (argc, argv, "ab:cdfhH?lLmMnNqrS:tvVZ123456789",
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|
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<<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 && !list && (!decompress || !ascii)) {
|
|
SET_BINARY_MODE(fileno(stdout));
|
|
}
|
|
while (optind < argc) {
|
|
treat_file(argv[optind++]);
|
|
}
|
|
} else { /* Standard input */
|
|
treat_stdin();
|
|
}
|
|
if (list && !quiet && file_count > 1) {
|
|
do_list(-1, -1); /* print totals */
|
|
}
|
|
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
|
|
|
|
if (strlen(iname) >= sizeof(ifname) - 3) {
|
|
errno = ENAMETOOLONG;
|
|
perror(iname);
|
|
exit_code = ERROR;
|
|
return ERROR;
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
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: */
|
|
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 "<filename>.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);
|
|
}
|