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lzip.c
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1993-10-25
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/* 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.
*/
/* Modified 10/93 by l.g. kahn to provide compression/decompression
from a called function passing the input and output file names
also modified in many other places to support the compression for my tape backup
program. */
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};
/* 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 1.25 1993/10/28 04:29:59 LKahn ESullivan Exp ESullivan $";
#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
# include "ntdirent.h"
typedef struct dirent dir_type;
# define NLENGTH(dirent) ((int)strlen((dirent)->d_name))
# define DIR_OPT "DIRENT"
#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 */
{"to-stdout", 0, 0, 'c'}, /* write output on standard output */
{"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 .gz file contents */
{"license", 0, 0, 'L'}, /* display software license */
{"no-name", 0, 0, 'n'}, /* don't save or restore original name & time */
{"name", 0, 0, 'N'}, /* save or restore original name & time */
{"quiet", 0, 0, 'q'}, /* quiet mode */
{"silent", 0, 0, 'q'}, /* quiet mode */
{"recursive", 0, 0, 'r'}, /* recurse through directories */
{"suffix", 1, 0, 'S'}, /* use given suffix instead of .gz */
{"test", 0, 0, 't'}, /* test compressed file integrity */
{"no-time", 0, 0, 'T'}, /* don't save or restore the time stamp */
{"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 int treat_file OF((char *iname));
local int create_outfile OF((void));
local int do_stat OF((char *name, struct stat *sbuf));
local int get_istat OF((char *iname, struct stat *sbuf));
local int same_file OF((struct stat *stat1, struct stat *stat2));
local int get_method OF((int in));
local int name_too_long OF((char *name, struct stat *statb));
local void do_list OF((int ifd, int method));
local int check_ofname OF((void));
local void copy_stat OF((struct stat *ifstat));
local int do_exit OF((int exitcode));
int (*work) OF((int infile, int outfile)) = zip; /* function to call */
#ifndef NO_DIR
local void treat_dir OF((char *dir));
#endif
#ifndef NO_UTIME
local void reset_times OF((char *name, struct stat *statb));
#endif
#define strequ(s1, s2) (strcmp((s1),(s2)) == 0)
/* lgk new linkage call routine so that we don't have the overhead of
calling system to perform compression, we also changed it so that
a new output file is not created from the input, and the output file is not deleted
after compressoin */
/* format is gzip_compress(input_filename, output_filename) */
int gzip_compress(input_file,output_file)
char *input_file;
char *output_file;
{
int rvalue = 0;
/* set flag not to store name and time in compressed file */
no_name = no_time = 1;
force = 1;
exit_code = 0;
/* 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
strcpy(ifname,input_file);
strcpy(ofname,output_file);
to_stdout = 0;
test = 0;
list = 0;
decompress = 0;
ascii = 0;
/* And get to work */
rvalue = treat_file(ifname);
if (rvalue != 0)
return(do_exit(1));
do_exit(exit_code);
return(0);
}
int gzip_decompress(input_file,output_file)
char *input_file;
char *output_file;
{
int rvalue = 0;
/* set flag not to store name and time in compressed file */
no_name = no_time = 1;
force = 1;
exit_code = 0;
/* 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
strcpy(ifname,input_file);
strcpy(ofname,output_file);
to_stdout = 0;
test = 0;
list = 0;
decompress = 1;
ascii = 0;
/* And get to work */
rvalue = treat_file(ifname);
if (rvalue != 0)
return(do_exit(1));
do_exit(exit_code);
return(0);
}
/* lgk main test program */
/*
int main(argc,argv)
int argc;
char *argv[];
{
int rvalue = 0;
if (argc < 4)
{
printf("Error needs three parameters ie c inname outname \n");
fflush(stdout);
return(1);
}
printf("argv 1 = %s argv 2 = %s argv 3 = %s \n",argv[1],argv[2],argv[3]);
fflush(stdout);
switch (argv[1][0])
{
case 'c':
printf("compressing %s to %s \n",argv[2],argv[3]);
fflush(stdout);
rvalue = gzip_compress(argv[2],argv[3]);
printf("return value = %d \n",rvalue);
fflush(stdout);
break;
case 'd':
printf("decompressing %s to %s \n",argv[2],argv[3]);
fflush(stdout);
rvalue = gzip_decompress(argv[2],argv[3]);
printf("return value = %d \n",rvalue);
fflush(stdout);
break;
default:
printf("error in test first parameter is not d or c \n");
fflush(stdout);
break;
}
return(0);
}
/* ========================================================================
* Compress or decompress the given file
*/
local int treat_file(iname)
char *iname;
{
/* Check if the input file is present, set ifname and istat: */
if (get_istat(iname, &istat) != OK)
return(1);
/* If the input name is that of a directory, recurse or ignore: */
if (S_ISDIR(istat.st_mode))
{
WARN((stderr,"%s: %s is a directory -- ignored\n", progname, ifname));
return (1);
}
if (!S_ISREG(istat.st_mode))
{
WARN((stderr,
"%s: %s is not a directory or a regular file - ignored\n",
progname, ifname));
return (1);
}
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).
*/
/* 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 (1);
}
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(1); /* error message already emitted */
}
}
/* lgk don't check the name here simply overwrite it since we decompress to
a temp file name anyway this check just takes extra time.
*/
/* 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 (create_outfile() != OK)
return(1);
/* Keep the name even if not truncated except with --no-name: */
if (!save_orig_name) save_orig_name = !no_name;
/* 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 */
} /* end of loop */
close(ifd);
if (!to_stdout && close(ofd))
{
write_error();
}
if (method == -1)
{
if (!to_stdout)
unlink (ofname); /* deletes partial file if it fails lgk */
return(1);
}
/* Copy modes, times, ownership, and remove the input file */
/* lgk modified copy_stat so input file is not deleted */
if (!to_stdout)
{
copy_stat(&istat);
}
return(0);
}
/* ========================================================================
* 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);
}
/* ========================================================================
* Set ifname to the input file name (with a suffix appended if necessary)
* and istat to its stats. For decompression, if no file exists with the
* original name, try adding successively z_suffix, .gz, .z, -z and .Z.
* For MSDOS, we try only z_suffix and z.
* Return OK or ERROR.
*/
local int get_istat(iname, sbuf)
char *iname;
struct stat *sbuf;
{
int ilen; /* strlen(ifname) */
static char *suffixes[] = {z_suffix, ".gz", ".z", "-z", ".Z", NULL};
char **suf = suffixes;
char *s;
#ifdef NO_MULTIPLE_DOTS
char *dot; /* pointer to ifname extension, or NULL */
#endif
strcpy(ifname, iname);
/* If input file exists, return OK. */
if (do_stat(ifname, sbuf) == 0) return OK;
if (!decompress || errno != ENOENT) {
perror(ifname);
exit_code = ERROR;
return ERROR;
}
/* file.ext doesn't exist, try adding a suffix (after removing any
* version number for VMS).
*/ /* lgk we don't need suffix code
//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;
}
/* ========================================================================
* 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;
}
/* ========================================================================
* 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 */
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 already exists;", ofname);
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: */
(void) chmod(ifname, 0777);
// lgk don't remove input file here
//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 int do_exit(exitcode)
int exitcode;
{
static int in_exit = 0;
if (in_exit) return(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
return(exitcode);
}
/* ========================================================================
* Signal and error handler.
*/
RETSIGTYPE abort_gzip()
{
if (remove_ofname) {
close(ofd);
unlink (ofname);
}
do_exit(ERROR);
exit(ERROR);
}