VC++ ZIP压缩程序源代码

/* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface * Copyright (C) 1992-1993 Jean-loup Gailly * The unzip code was written and put in the public domain by Mark Adler. * Portions of the lzw code are derived from the public domain 'compress' * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies, * Ken Turkowski, Dave Mack and Peter Jannesen. * * See the license_msg below and the file COPYING for the software license. * See the file algorithm.doc for the compression algorithms and file formats. */ static char *license_msg[] = { " Copyright (C) 1992-1993 Jean-loup Gailly", " This program is free software; you can redistribute it and/or modify", " it under the terms of the GNU General Public License as published by", " the Free Software Foundation; either version 2, or (at your option)", " any later version.", "", " This program is distributed in the hope that it will be useful,", " but WITHOUT ANY WARRANTY; without even the implied warranty of", " MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the", " GNU General Public License for more details.", "", " You should have received a copy of the GNU General Public License", " along with this program; if not, write to the Free Software", " Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.", 0}; /* Compress files with zip algorithm and 'compress' interface. * See usage() and help() functions below for all options. * Outputs: * file.gz: compressed file with same mode, owner, and utimes * or stdout with -c option or if stdin used as input. * If the output file name had to be truncated, the original name is kept * in the compressed file. * On MSDOS, file.tmp -> file.tmz. On VMS, file.tmp -> file.tmp-gz. * * Using gz on MSDOS would create too many file name conflicts. For * example, foo.txt -> foo.tgz (.tgz must be reserved as shorthand for * tar.gz). Similarly, foo.dir and foo.doc would both be mapped to foo.dgz. * I also considered 12345678.txt -> 12345txt.gz but this truncates the name * too heavily. There is no ideal solution given the MSDOS 8+3 limitation. * * For the meaning of all compilation flags, see comments in Makefile.in. */ #ifdef RCSID static char rcsid[] = "$Id: gzip.c,v 0.24 1993/06/24 10:52:07 jloup Exp $"; #endif #include <ctype.h> #include <sys/types.h> #include <signal.h> #include <sys/stat.h> #include <errno.h> #include "tailor.h" #include "gzip.h" #include "lzw.h" #include "revision.h" #include "getopt.h" /* configuration */ #ifdef NO_TIME_H # include <sys/time.h> #else # include <time.h> #endif #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) # 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) OF((int)); #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 #ifndef S_IRUSR # define S_IRUSR 0400 #endif #ifndef S_IWUSR # define S_IWUSR 0200 #endif #define RW_USER (S_IRUSR | S_IWUSR) /* creation mode for open() */ #ifndef MAX_PATH_LEN # define MAX_PATH_LEN 1024 /* max pathname length */ #endif #ifndef SEEK_END # define SEEK_END 2 #endif #ifdef NO_OFF_T typedef long off_t; off_t lseek OF((int fd, off_t offset, int whence)); #endif /* Separator for file name parts (see shorten_name()) */ #ifdef NO_MULTIPLE_DOTS # define PART_SEP "-" #else # define PART_SEP "." #endif /* global buffers */ DECLARE(uch, inbuf, INBUFSIZ +INBUF_EXTRA); DECLARE(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA); DECLARE(ush, d_buf, DIST_BUFSIZE); DECLARE(uch, window, 2L*WSIZE); #ifndef MAXSEG_64K DECLARE(ush, tab_prefix, 1L<<BITS); #else DECLARE(ush, tab_prefix0, 1L<<(BITS-1)); DECLARE(ush, tab_prefix1, 1L<<(BITS-1)); #endif /* local variables */ int ascii = 0; /* convert end-of-lines to local OS conventions */ int to_stdout = 0; /* output to stdout (-c) */ int decompress = 0; /* decompress (-d) */ int force = 0; /* don't ask questions, compress links (-f) */ int no_name = -1; /* don't save or restore the original file name */ int no_time = -1; /* don't save or restore the original file time */ int recursive = 0; /* recurse through directories (-r) */ int list = 0; /* list the file contents (-l) */ int verbose = 0; /* be verbose (-v) */ int quiet = 0; /* be very quiet (-q) */ int do_lzw = 0; /* generate output compatible with old compress (-Z) */ int test = 0; /* test .gz 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 = 6; /* 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 .gz file */ long 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 */ char z_suffix[MAX_SUFFIX+1]; /* default suffix (can be set with --suffix) */ int z_len; /* strlen(z_suffix) */ long bytes_in; /* number of input bytes */ long bytes_out; /* number of output bytes */ long total_in = 0; /* input bytes for all files */ long total_out = 0; /* output bytes for all files */ char ifname[MAX_PATH_LEN]; /* input file name */ char ofname[MAX_PATH_LEN]; /* output file name */ 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 */