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freebsd-skq/usr.bin/gzip/gzip.c
Xin LI 4ca8a62bb3 Add support for uncompressing pack(1)'ed files. Pack(1) is a program found 
in some commercial Unix systems, which utilizes Huffman minimum redundancy
code tree to compress files.  This implementation supports the "new" pack
format only, just like GNU gzip did.

Thanks for oliver@'s archive set which I can test against, and Mingyan Guo
for providing helpful review of my code.

PR:		bin/109567
MFC after:	1 month
2009-06-21 09:39:43 +00:00

2100 lines
44 KiB
C
Raw Blame History

/* $NetBSD: gzip.c,v 1.92 2008/07/21 14:19:22 lukem Exp $ */
/*-
* Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1997, 1998, 2003, 2004, 2006\
Matthew R. Green. All rights reserved.");
__RCSID("$FreeBSD$");
#endif /* not lint */
/*
* gzip.c -- GPL free gzip using zlib.
*
* RFC 1950 covers the zlib format
* RFC 1951 covers the deflate format
* RFC 1952 covers the gzip format
*
* TODO:
* - use mmap where possible
* - handle some signals better (remove outfile?)
* - make bzip2/compress -v/-t/-l support work as well as possible
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <inttypes.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <zlib.h>
#include <fts.h>
#include <libgen.h>
#include <stdarg.h>
#include <getopt.h>
#include <time.h>
#ifndef PRIdOFF
#define PRIdOFF PRId64
#endif
/* what type of file are we dealing with */
enum filetype {
FT_GZIP,
#ifndef NO_BZIP2_SUPPORT
FT_BZIP2,
#endif
#ifndef NO_COMPRESS_SUPPORT
FT_Z,
#endif
#ifndef NO_PACK_SUPPORT
FT_PACK,
#endif
FT_LAST,
FT_UNKNOWN
};
#ifndef NO_BZIP2_SUPPORT
#include <bzlib.h>
#define BZ2_SUFFIX ".bz2"
#define BZIP2_MAGIC "\102\132\150"
#endif
#ifndef NO_COMPRESS_SUPPORT
#define Z_SUFFIX ".Z"
#define Z_MAGIC "\037\235"
#endif
#ifndef NO_PACK_SUPPORT
#define PACK_MAGIC "\037\036"
#endif
#define GZ_SUFFIX ".gz"
#define BUFLEN (64 * 1024)
#define GZIP_MAGIC0 0x1F
#define GZIP_MAGIC1 0x8B
#define GZIP_OMAGIC1 0x9E
#define GZIP_TIMESTAMP (off_t)4
#define GZIP_ORIGNAME (off_t)10
#define HEAD_CRC 0x02
#define EXTRA_FIELD 0x04
#define ORIG_NAME 0x08
#define COMMENT 0x10
#define OS_CODE 3 /* Unix */
typedef struct {
const char *zipped;
int ziplen;
const char *normal; /* for unzip - must not be longer than zipped */
} suffixes_t;
static suffixes_t suffixes[] = {
#define SUFFIX(Z, N) {Z, sizeof Z - 1, N}
SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S .xxx */
#ifndef SMALL
SUFFIX(GZ_SUFFIX, ""),
SUFFIX(".z", ""),
SUFFIX("-gz", ""),
SUFFIX("-z", ""),
SUFFIX("_z", ""),
SUFFIX(".taz", ".tar"),
SUFFIX(".tgz", ".tar"),
#ifndef NO_BZIP2_SUPPORT
SUFFIX(BZ2_SUFFIX, ""),
SUFFIX(".tbz", ".tar"),
SUFFIX(".tbz2", ".tar"),
#endif
#ifndef NO_COMPRESS_SUPPORT
SUFFIX(Z_SUFFIX, ""),
#endif
SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S "" */
#endif /* SMALL */
#undef SUFFIX
};
#define NUM_SUFFIXES (sizeof suffixes / sizeof suffixes[0])
static const char gzip_version[] = "FreeBSD gzip 20090621";
#ifndef SMALL
static const char gzip_copyright[] = \
" Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green\n"
" All rights reserved.\n"
"\n"
" Redistribution and use in source and binary forms, with or without\n"
" modification, are permitted provided that the following conditions\n"
" are met:\n"
" 1. Redistributions of source code must retain the above copyright\n"
" notice, this list of conditions and the following disclaimer.\n"
" 2. Redistributions in binary form must reproduce the above copyright\n"
" notice, this list of conditions and the following disclaimer in the\n"
" documentation and/or other materials provided with the distribution.\n"
"\n"
" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n"
" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n"
" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n"
" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n"
" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,\n"
" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n"
" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED\n"
" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,\n"
" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\n"
" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\n"
" SUCH DAMAGE.";
#endif
static int cflag; /* stdout mode */
static int dflag; /* decompress mode */
static int lflag; /* list mode */
static int numflag = 6; /* gzip -1..-9 value */
#ifndef SMALL
static int fflag; /* force mode */
static int kflag; /* don't delete input files */
static int nflag; /* don't save name/timestamp */
static int Nflag; /* don't restore name/timestamp */
static int qflag; /* quiet mode */
static int rflag; /* recursive mode */
static int tflag; /* test */
static int vflag; /* verbose mode */
#else
#define qflag 0
#define tflag 0
#endif
static int exit_value = 0; /* exit value */
static char *infile; /* name of file coming in */
static void maybe_err(const char *fmt, ...) __dead2
__attribute__((__format__(__printf__, 1, 2)));
#ifndef NO_BZIP2_SUPPORT
static void maybe_errx(const char *fmt, ...) __dead2
__attribute__((__format__(__printf__, 1, 2)));
#endif
static void maybe_warn(const char *fmt, ...)
__attribute__((__format__(__printf__, 1, 2)));
static void maybe_warnx(const char *fmt, ...)
__attribute__((__format__(__printf__, 1, 2)));
static enum filetype file_gettype(u_char *);
#ifdef SMALL
#define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz)
#endif
static off_t gz_compress(int, int, off_t *, const char *, uint32_t);
static off_t gz_uncompress(int, int, char *, size_t, off_t *, const char *);
static off_t file_compress(char *, char *, size_t);
static off_t file_uncompress(char *, char *, size_t);
static void handle_pathname(char *);
static void handle_file(char *, struct stat *);
static void handle_stdin(void);
static void handle_stdout(void);
static void print_ratio(off_t, off_t, FILE *);
static void print_list(int fd, off_t, const char *, time_t);
static void usage(void);
static void display_version(void);
#ifndef SMALL
static void display_license(void);
#endif
static const suffixes_t *check_suffix(char *, int);
static ssize_t read_retry(int, void *, size_t);
#ifdef SMALL
#define unlink_input(f, sb) unlink(f)
#else
static off_t cat_fd(unsigned char *, size_t, off_t *, int fd);
static void prepend_gzip(char *, int *, char ***);
static void handle_dir(char *);
static void print_verbage(const char *, const char *, off_t, off_t);
static void print_test(const char *, int);
static void copymodes(int fd, const struct stat *, const char *file);
static int check_outfile(const char *outfile);
#endif
#ifndef NO_BZIP2_SUPPORT
static off_t unbzip2(int, int, char *, size_t, off_t *);
#endif
#ifndef NO_COMPRESS_SUPPORT
static FILE *zdopen(int);
static off_t zuncompress(FILE *, FILE *, char *, size_t, off_t *);
#endif
#ifndef NO_PACK_SUPPORT
static off_t unpack(int, int, char *, size_t, off_t *);
#endif
int main(int, char **p);
#ifdef SMALL
#define getopt_long(a,b,c,d,e) getopt(a,b,c)
#else
static const struct option longopts[] = {
{ "stdout", no_argument, 0, 'c' },
{ "to-stdout", no_argument, 0, 'c' },
{ "decompress", no_argument, 0, 'd' },
{ "uncompress", no_argument, 0, 'd' },
{ "force", no_argument, 0, 'f' },
{ "help", no_argument, 0, 'h' },
{ "keep", no_argument, 0, 'k' },
{ "list", no_argument, 0, 'l' },
{ "no-name", no_argument, 0, 'n' },
{ "name", no_argument, 0, 'N' },
{ "quiet", no_argument, 0, 'q' },
{ "recursive", no_argument, 0, 'r' },
{ "suffix", required_argument, 0, 'S' },
{ "test", no_argument, 0, 't' },
{ "verbose", no_argument, 0, 'v' },
{ "version", no_argument, 0, 'V' },
{ "fast", no_argument, 0, '1' },
{ "best", no_argument, 0, '9' },
{ "ascii", no_argument, 0, 'a' },
{ "license", no_argument, 0, 'L' },
{ NULL, no_argument, 0, 0 },
};
#endif
int
main(int argc, char **argv)
{
const char *progname = getprogname();
#ifndef SMALL
char *gzip;
int len;
#endif
int ch;
/* XXX set up signals */
#ifndef SMALL
if ((gzip = getenv("GZIP")) != NULL)
prepend_gzip(gzip, &argc, &argv);
#endif
/*
* XXX
* handle being called `gunzip', `zcat' and `gzcat'
*/
if (strcmp(progname, "gunzip") == 0)
dflag = 1;
else if (strcmp(progname, "zcat") == 0 ||
strcmp(progname, "gzcat") == 0)
dflag = cflag = 1;
#ifdef SMALL
#define OPT_LIST "123456789cdhltV"
#else
#define OPT_LIST "123456789acdfhklLNnqrS:tVv"
#endif
while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) {
switch (ch) {
case '1': case '2': case '3':
case '4': case '5': case '6':
case '7': case '8': case '9':
numflag = ch - '0';
break;
case 'c':
cflag = 1;
break;
case 'd':
dflag = 1;
break;
case 'l':
lflag = 1;
dflag = 1;
break;
case 'V':
display_version();
/* NOTREACHED */
#ifndef SMALL
case 'a':
fprintf(stderr, "%s: option --ascii ignored on this system\n", progname);
break;
case 'f':
fflag = 1;
break;
case 'k':
kflag = 1;
break;
case 'L':
display_license();
/* NOT REACHED */
case 'N':
nflag = 0;
Nflag = 1;
break;
case 'n':
nflag = 1;
Nflag = 0;
break;
case 'q':
qflag = 1;
break;
case 'r':
rflag = 1;
break;
case 'S':
len = strlen(optarg);
if (len != 0) {
suffixes[0].zipped = optarg;
suffixes[0].ziplen = len;
} else {
suffixes[NUM_SUFFIXES - 1].zipped = "";
suffixes[NUM_SUFFIXES - 1].ziplen = 0;
}
break;
case 't':
cflag = 1;
tflag = 1;
dflag = 1;
break;
case 'v':
vflag = 1;
break;
#endif
default:
usage();
/* NOTREACHED */
}
}
argv += optind;
argc -= optind;
if (argc == 0) {
if (dflag) /* stdin mode */
handle_stdin();
else /* stdout mode */
handle_stdout();
} else {
do {
handle_pathname(argv[0]);
} while (*++argv);
}
#ifndef SMALL
if (qflag == 0 && lflag && argc > 1)
print_list(-1, 0, "(totals)", 0);
#endif
exit(exit_value);
}
/* maybe print a warning */
void
maybe_warn(const char *fmt, ...)
{
va_list ap;
if (qflag == 0) {
va_start(ap, fmt);
vwarn(fmt, ap);
va_end(ap);
}
if (exit_value == 0)
exit_value = 1;
}
/* ... without an errno. */
void
maybe_warnx(const char *fmt, ...)
{
va_list ap;
if (qflag == 0) {
va_start(ap, fmt);
vwarnx(fmt, ap);
va_end(ap);
}
if (exit_value == 0)
exit_value = 1;
}
/* maybe print an error */
void
maybe_err(const char *fmt, ...)
{
va_list ap;
if (qflag == 0) {
va_start(ap, fmt);
vwarn(fmt, ap);
va_end(ap);
}
exit(2);
}
#ifndef NO_BZIP2_SUPPORT
/* ... without an errno. */
void
maybe_errx(const char *fmt, ...)
{
va_list ap;
if (qflag == 0) {
va_start(ap, fmt);
vwarnx(fmt, ap);
va_end(ap);
}
exit(2);
}
#endif
#ifndef SMALL
/* split up $GZIP and prepend it to the argument list */
static void
prepend_gzip(char *gzip, int *argc, char ***argv)
{
char *s, **nargv, **ac;
int nenvarg = 0, i;
/* scan how many arguments there are */
for (s = gzip;;) {
while (*s == ' ' || *s == '\t')
s++;
if (*s == 0)
goto count_done;
nenvarg++;
while (*s != ' ' && *s != '\t')
if (*s++ == 0)
goto count_done;
}
count_done:
/* punt early */
if (nenvarg == 0)
return;
*argc += nenvarg;
ac = *argv;
nargv = (char **)malloc((*argc + 1) * sizeof(char *));
if (nargv == NULL)
maybe_err("malloc");
/* stash this away */
*argv = nargv;
/* copy the program name first */
i = 0;
nargv[i++] = *(ac++);
/* take a copy of $GZIP and add it to the array */
s = strdup(gzip);
if (s == NULL)
maybe_err("strdup");
for (;;) {
/* Skip whitespaces. */
while (*s == ' ' || *s == '\t')
s++;
if (*s == 0)
goto copy_done;
nargv[i++] = s;
/* Find the end of this argument. */
while (*s != ' ' && *s != '\t')
if (*s++ == 0)
/* Argument followed by NUL. */
goto copy_done;
/* Terminate by overwriting ' ' or '\t' with NUL. */
*s++ = 0;
}
copy_done:
/* copy the original arguments and a NULL */
while (*ac)
nargv[i++] = *(ac++);
nargv[i] = NULL;
}
#endif
/* compress input to output. Return bytes read, -1 on error */
static off_t
gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime)
{
z_stream z;
char *outbufp, *inbufp;
off_t in_tot = 0, out_tot = 0;
ssize_t in_size;
int i, error;
uLong crc;
#ifdef SMALL
static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0,
0, 0, 0, 0,
0, OS_CODE };
#endif
outbufp = malloc(BUFLEN);
inbufp = malloc(BUFLEN);
if (outbufp == NULL || inbufp == NULL) {
maybe_err("malloc failed");
goto out;
}
memset(&z, 0, sizeof z);
z.zalloc = Z_NULL;
z.zfree = Z_NULL;
z.opaque = 0;
#ifdef SMALL
memcpy(outbufp, header, sizeof header);
i = sizeof header;
#else
if (nflag != 0) {
mtime = 0;
origname = "";
}
i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s",
GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED,
*origname ? ORIG_NAME : 0,
mtime & 0xff,
(mtime >> 8) & 0xff,
(mtime >> 16) & 0xff,
(mtime >> 24) & 0xff,
numflag == 1 ? 4 : numflag == 9 ? 2 : 0,
OS_CODE, origname);
if (i >= BUFLEN)
/* this need PATH_MAX > BUFLEN ... */
maybe_err("snprintf");
if (*origname)
i++;
#endif
z.next_out = (unsigned char *)outbufp + i;
z.avail_out = BUFLEN - i;
error = deflateInit2(&z, numflag, Z_DEFLATED,
(-MAX_WBITS), 8, Z_DEFAULT_STRATEGY);
if (error != Z_OK) {
maybe_warnx("deflateInit2 failed");
in_tot = -1;
goto out;
}
crc = crc32(0L, Z_NULL, 0);
for (;;) {
if (z.avail_out == 0) {
if (write(out, outbufp, BUFLEN) != BUFLEN) {
maybe_warn("write");
out_tot = -1;
goto out;
}
out_tot += BUFLEN;
z.next_out = (unsigned char *)outbufp;
z.avail_out = BUFLEN;
}
if (z.avail_in == 0) {
in_size = read(in, inbufp, BUFLEN);
if (in_size < 0) {
maybe_warn("read");
in_tot = -1;
goto out;
}
if (in_size == 0)
break;
crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size);
in_tot += in_size;
z.next_in = (unsigned char *)inbufp;
z.avail_in = in_size;
}
error = deflate(&z, Z_NO_FLUSH);
if (error != Z_OK && error != Z_STREAM_END) {
maybe_warnx("deflate failed");
in_tot = -1;
goto out;
}
}
/* clean up */
for (;;) {
size_t len;
ssize_t w;
error = deflate(&z, Z_FINISH);
if (error != Z_OK && error != Z_STREAM_END) {
maybe_warnx("deflate failed");
in_tot = -1;
goto out;
}
len = (char *)z.next_out - outbufp;
w = write(out, outbufp, len);
if (w == -1 || (size_t)w != len) {
maybe_warn("write");
out_tot = -1;
goto out;
}
out_tot += len;
z.next_out = (unsigned char *)outbufp;
z.avail_out = BUFLEN;
if (error == Z_STREAM_END)
break;
}
if (deflateEnd(&z) != Z_OK) {
maybe_warnx("deflateEnd failed");
in_tot = -1;
goto out;
}
i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c",
(int)crc & 0xff,
(int)(crc >> 8) & 0xff,
(int)(crc >> 16) & 0xff,
(int)(crc >> 24) & 0xff,
(int)in_tot & 0xff,
(int)(in_tot >> 8) & 0xff,
(int)(in_tot >> 16) & 0xff,
(int)(in_tot >> 24) & 0xff);
if (i != 8)
maybe_err("snprintf");
if (write(out, outbufp, i) != i) {
maybe_warn("write");
in_tot = -1;
} else
out_tot += i;
out:
if (inbufp != NULL)
free(inbufp);
if (outbufp != NULL)
free(outbufp);
if (gsizep)
*gsizep = out_tot;
return in_tot;
}
/*
* uncompress input to output then close the input. return the
* uncompressed size written, and put the compressed sized read
* into `*gsizep'.
*/
static off_t
gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
const char *filename)
{
z_stream z;
char *outbufp, *inbufp;
off_t out_tot = -1, in_tot = 0;
uint32_t out_sub_tot = 0;
enum {
GZSTATE_MAGIC0,
GZSTATE_MAGIC1,
GZSTATE_METHOD,
GZSTATE_FLAGS,
GZSTATE_SKIPPING,
GZSTATE_EXTRA,
GZSTATE_EXTRA2,
GZSTATE_EXTRA3,
GZSTATE_ORIGNAME,
GZSTATE_COMMENT,
GZSTATE_HEAD_CRC1,
GZSTATE_HEAD_CRC2,
GZSTATE_INIT,
GZSTATE_READ,
GZSTATE_CRC,
GZSTATE_LEN,
} state = GZSTATE_MAGIC0;
int flags = 0, skip_count = 0;
int error = Z_STREAM_ERROR, done_reading = 0;
uLong crc = 0;
ssize_t wr;
int needmore = 0;
#define ADVANCE() { z.next_in++; z.avail_in--; }
if ((outbufp = malloc(BUFLEN)) == NULL) {
maybe_err("malloc failed");
goto out2;
}
if ((inbufp = malloc(BUFLEN)) == NULL) {
maybe_err("malloc failed");
goto out1;
}
memset(&z, 0, sizeof z);
z.avail_in = prelen;
z.next_in = (unsigned char *)pre;
z.avail_out = BUFLEN;
z.next_out = (unsigned char *)outbufp;
z.zalloc = NULL;
z.zfree = NULL;
z.opaque = 0;
in_tot = prelen;
out_tot = 0;
for (;;) {
if ((z.avail_in == 0 || needmore) && done_reading == 0) {
ssize_t in_size;
if (z.avail_in > 0) {
memmove(inbufp, z.next_in, z.avail_in);
}
z.next_in = (unsigned char *)inbufp;
in_size = read(in, z.next_in + z.avail_in,
BUFLEN - z.avail_in);
if (in_size == -1) {
maybe_warn("failed to read stdin");
goto stop_and_fail;
} else if (in_size == 0) {
done_reading = 1;
}
z.avail_in += in_size;
needmore = 0;
in_tot += in_size;
}
if (z.avail_in == 0) {
if (done_reading && state != GZSTATE_MAGIC0) {
maybe_warnx("%s: unexpected end of file",
filename);
goto stop_and_fail;
}
goto stop;
}
switch (state) {
case GZSTATE_MAGIC0:
if (*z.next_in != GZIP_MAGIC0) {
if (in_tot > 0) {
maybe_warnx("%s: trailing garbage "
"ignored", filename);
goto stop;
}
maybe_warnx("input not gziped (MAGIC0)");
goto stop_and_fail;
}
ADVANCE();
state++;
out_sub_tot = 0;
crc = crc32(0L, Z_NULL, 0);
break;
case GZSTATE_MAGIC1:
if (*z.next_in != GZIP_MAGIC1 &&
*z.next_in != GZIP_OMAGIC1) {
maybe_warnx("input not gziped (MAGIC1)");
goto stop_and_fail;
}
ADVANCE();
state++;
break;
case GZSTATE_METHOD:
if (*z.next_in != Z_DEFLATED) {
maybe_warnx("unknown compression method");
goto stop_and_fail;
}
ADVANCE();
state++;
break;
case GZSTATE_FLAGS:
flags = *z.next_in;
ADVANCE();
skip_count = 6;
state++;
break;
case GZSTATE_SKIPPING:
if (skip_count > 0) {
skip_count--;
ADVANCE();
} else
state++;
break;
case GZSTATE_EXTRA:
if ((flags & EXTRA_FIELD) == 0) {
state = GZSTATE_ORIGNAME;
break;
}
skip_count = *z.next_in;
ADVANCE();
state++;
break;
case GZSTATE_EXTRA2:
skip_count |= ((*z.next_in) << 8);
ADVANCE();
state++;
break;
case GZSTATE_EXTRA3:
if (skip_count > 0) {
skip_count--;
ADVANCE();
} else
state++;
break;
case GZSTATE_ORIGNAME:
if ((flags & ORIG_NAME) == 0) {
state++;
break;
}
if (*z.next_in == 0)
state++;
ADVANCE();
break;
case GZSTATE_COMMENT:
if ((flags & COMMENT) == 0) {
state++;
break;
}
if (*z.next_in == 0)
state++;
ADVANCE();
break;
case GZSTATE_HEAD_CRC1:
if (flags & HEAD_CRC)
skip_count = 2;
else
skip_count = 0;
state++;
break;
case GZSTATE_HEAD_CRC2:
if (skip_count > 0) {
skip_count--;
ADVANCE();
} else
state++;
break;
case GZSTATE_INIT:
if (inflateInit2(&z, -MAX_WBITS) != Z_OK) {
maybe_warnx("failed to inflateInit");
goto stop_and_fail;
}
state++;
break;
case GZSTATE_READ:
error = inflate(&z, Z_FINISH);
switch (error) {
/* Z_BUF_ERROR goes with Z_FINISH... */
case Z_BUF_ERROR:
case Z_STREAM_END:
case Z_OK:
break;
case Z_NEED_DICT:
maybe_warnx("Z_NEED_DICT error");
goto stop_and_fail;
case Z_DATA_ERROR:
maybe_warnx("data stream error");
goto stop_and_fail;
case Z_STREAM_ERROR:
maybe_warnx("internal stream error");
goto stop_and_fail;
case Z_MEM_ERROR:
maybe_warnx("memory allocation error");
goto stop_and_fail;
default:
maybe_warn("unknown error from inflate(): %d",
error);
}
wr = BUFLEN - z.avail_out;
if (wr != 0) {
crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr);
if (
#ifndef SMALL
/* don't write anything with -t */
tflag == 0 &&
#endif
write(out, outbufp, wr) != wr) {
maybe_warn("error writing to output");
goto stop_and_fail;
}
out_tot += wr;
out_sub_tot += wr;
}
if (error == Z_STREAM_END) {
inflateEnd(&z);
state++;
}
z.next_out = (unsigned char *)outbufp;
z.avail_out = BUFLEN;
break;
case GZSTATE_CRC:
{
uLong origcrc;
if (z.avail_in < 4) {
if (!done_reading) {
needmore = 1;
continue;
}
maybe_warnx("truncated input");
goto stop_and_fail;
}
origcrc = ((unsigned)z.next_in[0] & 0xff) |
((unsigned)z.next_in[1] & 0xff) << 8 |
((unsigned)z.next_in[2] & 0xff) << 16 |
((unsigned)z.next_in[3] & 0xff) << 24;
if (origcrc != crc) {
maybe_warnx("invalid compressed"
" data--crc error");
goto stop_and_fail;
}
}
z.avail_in -= 4;
z.next_in += 4;
if (!z.avail_in && done_reading) {
goto stop;
}
state++;
break;
case GZSTATE_LEN:
{
uLong origlen;
if (z.avail_in < 4) {
if (!done_reading) {
needmore = 1;
continue;
}
maybe_warnx("truncated input");
goto stop_and_fail;
}
origlen = ((unsigned)z.next_in[0] & 0xff) |
((unsigned)z.next_in[1] & 0xff) << 8 |
((unsigned)z.next_in[2] & 0xff) << 16 |
((unsigned)z.next_in[3] & 0xff) << 24;
if (origlen != out_sub_tot) {
maybe_warnx("invalid compressed"
" data--length error");
goto stop_and_fail;
}
}
z.avail_in -= 4;
z.next_in += 4;
if (error < 0) {
maybe_warnx("decompression error");
goto stop_and_fail;
}
state = GZSTATE_MAGIC0;
break;
}
continue;
stop_and_fail:
out_tot = -1;
stop:
break;
}
if (state > GZSTATE_INIT)
inflateEnd(&z);
free(inbufp);
out1:
free(outbufp);
out2:
if (gsizep)
*gsizep = in_tot;
return (out_tot);
}
#ifndef SMALL
/*
* set the owner, mode, flags & utimes using the given file descriptor.
* file is only used in possible warning messages.
*/
static void
copymodes(int fd, const struct stat *sbp, const char *file)
{
struct timeval times[2];
struct stat sb;
/*
* If we have no info on the input, give this file some
* default values and return..
*/
if (sbp == NULL) {
mode_t mask = umask(022);
(void)fchmod(fd, DEFFILEMODE & ~mask);
(void)umask(mask);
return;
}
sb = *sbp;
/* if the chown fails, remove set-id bits as-per compress(1) */
if (fchown(fd, sb.st_uid, sb.st_gid) < 0) {
if (errno != EPERM)
maybe_warn("couldn't fchown: %s", file);
sb.st_mode &= ~(S_ISUID|S_ISGID);
}
/* we only allow set-id and the 9 normal permission bits */
sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
if (fchmod(fd, sb.st_mode) < 0)
maybe_warn("couldn't fchmod: %s", file);
TIMESPEC_TO_TIMEVAL(&times[0], &sb.st_atimespec);
TIMESPEC_TO_TIMEVAL(&times[1], &sb.st_mtimespec);
if (futimes(fd, times) < 0)
maybe_warn("couldn't utimes: %s", file);
/* only try flags if they exist already */
if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0)
maybe_warn("couldn't fchflags: %s", file);
}
#endif
/* what sort of file is this? */
static enum filetype
file_gettype(u_char *buf)
{
if (buf[0] == GZIP_MAGIC0 &&
(buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
return FT_GZIP;
else
#ifndef NO_BZIP2_SUPPORT
if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
buf[3] >= '0' && buf[3] <= '9')
return FT_BZIP2;
else
#endif
#ifndef NO_COMPRESS_SUPPORT
if (memcmp(buf, Z_MAGIC, 2) == 0)
return FT_Z;
else
#endif
#ifndef NO_PACK_SUPPORT
if (memcmp(buf, PACK_MAGIC, 2) == 0)
return FT_PACK;
else
#endif
return FT_UNKNOWN;
}
#ifndef SMALL
/* check the outfile is OK. */
static int
check_outfile(const char *outfile)
{
struct stat sb;
int ok = 1;
if (lflag == 0 && stat(outfile, &sb) == 0) {
if (fflag)
unlink(outfile);
else if (isatty(STDIN_FILENO)) {
char ans[10] = { 'n', '\0' }; /* default */
fprintf(stderr, "%s already exists -- do you wish to "
"overwrite (y or n)? " , outfile);
(void)fgets(ans, sizeof(ans) - 1, stdin);
if (ans[0] != 'y' && ans[0] != 'Y') {
fprintf(stderr, "\tnot overwriting\n");
ok = 0;
} else
unlink(outfile);
} else {
maybe_warnx("%s already exists -- skipping", outfile);
ok = 0;
}
}
return ok;
}
static void
unlink_input(const char *file, const struct stat *sb)
{
struct stat nsb;
if (kflag)
return;
if (stat(file, &nsb) != 0)
/* Must be gone alrady */
return;
if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
/* Definitely a different file */
return;
unlink(file);
}
#endif
static const suffixes_t *
check_suffix(char *file, int xlate)
{
const suffixes_t *s;
int len = strlen(file);
char *sp;
for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
/* if it doesn't fit in "a.suf", don't bother */
if (s->ziplen >= len)
continue;
sp = file + len - s->ziplen;
if (strcmp(s->zipped, sp) != 0)
continue;
if (xlate)
strcpy(sp, s->normal);
return s;
}
return NULL;
}
/*
* compress the given file: create a corresponding .gz file and remove the
* original.
*/
static off_t
file_compress(char *file, char *outfile, size_t outsize)
{
int in;
int out;
off_t size, insize;
#ifndef SMALL
struct stat isb, osb;
const suffixes_t *suff;
#endif
in = open(file, O_RDONLY);
if (in == -1) {
maybe_warn("can't open %s", file);
return -1;
}
if (cflag == 0) {
#ifndef SMALL
if (fstat(in, &isb) == 0) {
if (isb.st_nlink > 1 && fflag == 0) {
maybe_warnx("%s has %d other link%s -- "
"skipping", file, isb.st_nlink - 1,
isb.st_nlink == 1 ? "" : "s");
close(in);
return -1;
}
}
if (fflag == 0 && (suff = check_suffix(file, 0))
&& suff->zipped[0] != 0) {
maybe_warnx("%s already has %s suffix -- unchanged",
file, suff->zipped);
close(in);
return -1;
}
#endif
/* Add (usually) .gz to filename */
if ((size_t)snprintf(outfile, outsize, "%s%s",
file, suffixes[0].zipped) >= outsize)
memcpy(outfile - suffixes[0].ziplen - 1,
suffixes[0].zipped, suffixes[0].ziplen + 1);
#ifndef SMALL
if (check_outfile(outfile) == 0) {
close(in);
return -1;
}
#endif
}
if (cflag == 0) {
out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
if (out == -1) {
maybe_warn("could not create output: %s", outfile);
fclose(stdin);
return -1;
}
} else
out = STDOUT_FILENO;
insize = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
(void)close(in);
/*
* If there was an error, insize will be -1.
* If we compressed to stdout, just return the size.
* Otherwise stat the file and check it is the correct size.
* We only blow away the file if we can stat the output and it
* has the expected size.
*/
if (cflag != 0)
return insize == -1 ? -1 : size;
#ifndef SMALL
if (fstat(out, &osb) != 0) {
maybe_warn("couldn't stat: %s", outfile);
goto bad_outfile;
}
if (osb.st_size != size) {
maybe_warnx("output file: %s wrong size (%" PRIdOFF
" != %" PRIdOFF "), deleting",
outfile, osb.st_size, size);
goto bad_outfile;
}
copymodes(out, &isb, outfile);
#endif
if (close(out) == -1)
maybe_warn("couldn't close output");
/* output is good, ok to delete input */
unlink_input(file, &isb);
return size;
#ifndef SMALL
bad_outfile:
if (close(out) == -1)
maybe_warn("couldn't close output");
maybe_warnx("leaving original %s", file);
unlink(outfile);
return size;
#endif
}
/* uncompress the given file and remove the original */
static off_t
file_uncompress(char *file, char *outfile, size_t outsize)
{
struct stat isb, osb;
off_t size;
ssize_t rbytes;
unsigned char header1[4];
enum filetype method;
int fd, ofd, zfd = -1;
#ifndef SMALL
time_t timestamp = 0;
unsigned char name[PATH_MAX + 1];
#endif
/* gather the old name info */
fd = open(file, O_RDONLY);
if (fd < 0) {
maybe_warn("can't open %s", file);
goto lose;
}
strlcpy(outfile, file, outsize);
if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
maybe_warnx("%s: unknown suffix -- ignored", file);
goto lose;
}
rbytes = read(fd, header1, sizeof header1);
if (rbytes != sizeof header1) {
/* we don't want to fail here. */
#ifndef SMALL
if (fflag)
goto lose;
#endif
if (rbytes == -1)
maybe_warn("can't read %s", file);
else
goto unexpected_EOF;
goto lose;
}
method = file_gettype(header1);
#ifndef SMALL
if (fflag == 0 && method == FT_UNKNOWN) {
maybe_warnx("%s: not in gzip format", file);
goto lose;
}
#endif
#ifndef SMALL
if (method == FT_GZIP && Nflag) {
unsigned char ts[4]; /* timestamp */
int rv;
rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP);
if (rv >= 0 && (size_t)rv < sizeof ts)
goto unexpected_EOF;
if (rv == -1) {
if (!fflag)
maybe_warn("can't read %s", file);
goto lose;
}
timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0];
if (header1[3] & ORIG_NAME) {
rbytes = pread(fd, name, sizeof name, GZIP_ORIGNAME);
if (rbytes < 0) {
maybe_warn("can't read %s", file);
goto lose;
}
if (name[0] != 0) {
/* preserve original directory name */
char *dp = strrchr(file, '/');
if (dp == NULL)
dp = file;
else
dp++;
snprintf(outfile, outsize, "%.*s%.*s",
(int) (dp - file),
file, (int) rbytes, name);
}
}
}
#endif
lseek(fd, 0, SEEK_SET);
if (cflag == 0 || lflag) {
if (fstat(fd, &isb) != 0)
goto lose;
#ifndef SMALL
if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
maybe_warnx("%s has %d other links -- skipping",
file, isb.st_nlink - 1);
goto lose;
}
if (nflag == 0 && timestamp)
isb.st_mtime = timestamp;
if (check_outfile(outfile) == 0)
goto lose;
#endif
}
if (cflag == 0 && lflag == 0) {
zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
if (zfd == STDOUT_FILENO) {
/* We won't close STDOUT_FILENO later... */
zfd = dup(zfd);
close(STDOUT_FILENO);
}
if (zfd == -1) {
maybe_warn("can't open %s", outfile);
goto lose;
}
} else
zfd = STDOUT_FILENO;
#ifndef NO_BZIP2_SUPPORT
if (method == FT_BZIP2) {
/* XXX */
if (lflag) {
maybe_warnx("no -l with bzip2 files");
goto lose;
}
size = unbzip2(fd, zfd, NULL, 0, NULL);
} else
#endif
#ifndef NO_COMPRESS_SUPPORT
if (method == FT_Z) {
FILE *in, *out;
/* XXX */
if (lflag) {
maybe_warnx("no -l with Lempel-Ziv files");
goto lose;
}
if ((in = zdopen(fd)) == NULL) {
maybe_warn("zdopen for read: %s", file);
goto lose;
}
out = fdopen(dup(zfd), "w");
if (out == NULL) {
maybe_warn("fdopen for write: %s", outfile);
fclose(in);
goto lose;
}
size = zuncompress(in, out, NULL, 0, NULL);
/* need to fclose() if ferror() is true... */
if (ferror(in) | fclose(in)) {
maybe_warn("failed infile fclose");
unlink(outfile);
(void)fclose(out);
}
if (fclose(out) != 0) {
maybe_warn("failed outfile fclose");
unlink(outfile);
goto lose;
}
} else
#endif
#ifndef NO_PACK_SUPPORT
if (method == FT_PACK) {
if (lflag) {
maybe_warnx("no -l with packed files");
goto lose;
}
size = unpack(fd, zfd, NULL, 0, NULL);
} else
#endif
#ifndef SMALL
if (method == FT_UNKNOWN) {
if (lflag) {
maybe_warnx("no -l for unknown filetypes");
goto lose;
}
size = cat_fd(NULL, 0, NULL, fd);
} else
#endif
{
if (lflag) {
print_list(fd, isb.st_size, outfile, isb.st_mtime);
close(fd);
return -1; /* XXX */
}
size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
}
if (close(fd) != 0)
maybe_warn("couldn't close input");
if (zfd != STDOUT_FILENO && close(zfd) != 0)
maybe_warn("couldn't close output");
if (size == -1) {
if (cflag == 0)
unlink(outfile);
maybe_warnx("%s: uncompress failed", file);
return -1;
}
/* if testing, or we uncompressed to stdout, this is all we need */
#ifndef SMALL
if (tflag)
return size;
#endif
/* if we are uncompressing to stdin, don't remove the file. */
if (cflag)
return size;
/*
* if we create a file...
*/
/*
* if we can't stat the file don't remove the file.
*/
ofd = open(outfile, O_RDWR, 0);
if (ofd == -1) {
maybe_warn("couldn't open (leaving original): %s",
outfile);
return -1;
}
if (fstat(ofd, &osb) != 0) {
maybe_warn("couldn't stat (leaving original): %s",
outfile);
close(ofd);
return -1;
}
if (osb.st_size != size) {
maybe_warnx("stat gave different size: %" PRIdOFF
" != %" PRIdOFF " (leaving original)",
size, osb.st_size);
close(ofd);
unlink(outfile);
return -1;
}
unlink_input(file, &isb);
#ifndef SMALL
copymodes(ofd, &isb, outfile);
#endif
close(ofd);
return size;
unexpected_EOF:
maybe_warnx("%s: unexpected end of file", file);
lose:
if (fd != -1)
close(fd);
if (zfd != -1 && zfd != STDOUT_FILENO)
close(fd);
return -1;
}
#ifndef SMALL
static off_t
cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd)
{
char buf[BUFLEN];
off_t in_tot;
ssize_t w;
in_tot = count;
w = write(STDOUT_FILENO, prepend, count);
if (w == -1 || (size_t)w != count) {
maybe_warn("write to stdout");
return -1;
}
for (;;) {
ssize_t rv;
rv = read(fd, buf, sizeof buf);
if (rv == 0)
break;
if (rv < 0) {
maybe_warn("read from fd %d", fd);
break;
}
if (write(STDOUT_FILENO, buf, rv) != rv) {
maybe_warn("write to stdout");
break;
}
in_tot += rv;
}
if (gsizep)
*gsizep = in_tot;
return (in_tot);
}
#endif
static void
handle_stdin(void)
{
unsigned char header1[4];
off_t usize, gsize;
enum filetype method;
ssize_t bytes_read;
#ifndef NO_COMPRESS_SUPPORT
FILE *in;
#endif
#ifndef SMALL
if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
maybe_warnx("standard input is a terminal -- ignoring");
return;
}
#endif
if (lflag) {
struct stat isb;
/* XXX could read the whole file, etc. */
if (fstat(STDIN_FILENO, &isb) < 0) {
maybe_warn("fstat");
return;
}
print_list(STDIN_FILENO, isb.st_size, "stdout", isb.st_mtime);
return;
}
bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1);
if (bytes_read == -1) {
maybe_warn("can't read stdin");
return;
} else if (bytes_read != sizeof(header1)) {
maybe_warnx("(stdin): unexpected end of file");
return;
}
method = file_gettype(header1);
switch (method) {
default:
#ifndef SMALL
if (fflag == 0) {
maybe_warnx("unknown compression format");
return;
}
usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO);
break;
#endif
case FT_GZIP:
usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
(char *)header1, sizeof header1, &gsize, "(stdin)");
break;
#ifndef NO_BZIP2_SUPPORT
case FT_BZIP2:
usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
(char *)header1, sizeof header1, &gsize);
break;
#endif
#ifndef NO_COMPRESS_SUPPORT
case FT_Z:
if ((in = zdopen(STDIN_FILENO)) == NULL) {
maybe_warnx("zopen of stdin");
return;
}
usize = zuncompress(in, stdout, (char *)header1, sizeof header1, &gsize);
fclose(in);
break;
#endif
#ifndef NO_PACK_SUPPORT
case FT_PACK:
usize = unpack(STDIN_FILENO, STDOUT_FILENO,
(char *)header1, sizeof header1, &gsize);
break;
#endif
}
#ifndef SMALL
if (vflag && !tflag && usize != -1 && gsize != -1)
print_verbage(NULL, NULL, usize, gsize);
if (vflag && tflag)
print_test("(stdin)", usize != -1);
#endif
}
static void
handle_stdout(void)
{
off_t gsize, usize;
struct stat sb;
time_t systime;
uint32_t mtime;
int ret;
#ifndef SMALL
if (fflag == 0 && isatty(STDOUT_FILENO)) {
maybe_warnx("standard output is a terminal -- ignoring");
return;
}
#endif
/* If stdin is a file use it's mtime, otherwise use current time */
ret = fstat(STDIN_FILENO, &sb);
#ifndef SMALL
if (ret < 0) {
maybe_warn("Can't stat stdin");
return;
}
#endif
if (S_ISREG(sb.st_mode))
mtime = (uint32_t)sb.st_mtime;
else {
systime = time(NULL);
#ifndef SMALL
if (systime == -1) {
maybe_warn("time");
return;
}
#endif
mtime = (uint32_t)systime;
}
usize = gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime);
#ifndef SMALL
if (vflag && !tflag && usize != -1 && gsize != -1)
print_verbage(NULL, NULL, usize, gsize);
#endif
}
/* do what is asked for, for the path name */
static void
handle_pathname(char *path)
{
char *opath = path, *s = NULL;
ssize_t len;
int slen;
struct stat sb;
/* check for stdout/stdin */
if (path[0] == '-' && path[1] == '\0') {
if (dflag)
handle_stdin();
else
handle_stdout();
return;
}
retry:
if (stat(path, &sb) != 0) {
/* lets try <path>.gz if we're decompressing */
if (dflag && s == NULL && errno == ENOENT) {
len = strlen(path);
slen = suffixes[0].ziplen;
s = malloc(len + slen + 1);
if (s == NULL)
maybe_err("malloc");
memcpy(s, path, len);
memcpy(s + len, suffixes[0].zipped, slen + 1);
path = s;
goto retry;
}
maybe_warn("can't stat: %s", opath);
goto out;
}
if (S_ISDIR(sb.st_mode)) {
#ifndef SMALL
if (rflag)
handle_dir(path);
else
#endif
maybe_warnx("%s is a directory", path);
goto out;
}
if (S_ISREG(sb.st_mode))
handle_file(path, &sb);
else
maybe_warnx("%s is not a regular file", path);
out:
if (s)
free(s);
}
/* compress/decompress a file */
static void
handle_file(char *file, struct stat *sbp)
{
off_t usize, gsize;
char outfile[PATH_MAX];
infile = file;
if (dflag) {
usize = file_uncompress(file, outfile, sizeof(outfile));
#ifndef SMALL
if (vflag && tflag)
print_test(file, usize != -1);
#endif
if (usize == -1)
return;
gsize = sbp->st_size;
} else {
gsize = file_compress(file, outfile, sizeof(outfile));
if (gsize == -1)
return;
usize = sbp->st_size;
}
#ifndef SMALL
if (vflag && !tflag)
print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
#endif
}
#ifndef SMALL
/* this is used with -r to recursively descend directories */
static void
handle_dir(char *dir)
{
char *path_argv[2];
FTS *fts;
FTSENT *entry;
path_argv[0] = dir;
path_argv[1] = 0;
fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
if (fts == NULL) {
warn("couldn't fts_open %s", dir);
return;
}
while ((entry = fts_read(fts))) {
switch(entry->fts_info) {
case FTS_D:
case FTS_DP:
continue;
case FTS_DNR:
case FTS_ERR:
case FTS_NS:
maybe_warn("%s", entry->fts_path);
continue;
case FTS_F:
handle_file(entry->fts_path, entry->fts_statp);
}
}
(void)fts_close(fts);
}
#endif
/* print a ratio - size reduction as a fraction of uncompressed size */
static void
print_ratio(off_t in, off_t out, FILE *where)
{
int percent10; /* 10 * percent */
off_t diff;
char buff[8];
int len;
diff = in - out/2;
if (diff <= 0)
/*
* Output is more than double size of input! print -99.9%
* Quite possibly we've failed to get the original size.
*/
percent10 = -999;
else {
/*
* We only need 12 bits of result from the final division,
* so reduce the values until a 32bit division will suffice.
*/
while (in > 0x100000) {
diff >>= 1;
in >>= 1;
}
if (in != 0)
percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
else
percent10 = 0;
}
len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
/* Move the '.' to before the last digit */
buff[len - 1] = buff[len - 2];
buff[len - 2] = '.';
fprintf(where, "%5s%%", buff);
}
#ifndef SMALL
/* print compression statistics, and the new name (if there is one!) */
static void
print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
{
if (file)
fprintf(stderr, "%s:%s ", file,
strlen(file) < 7 ? "\t\t" : "\t");
print_ratio(usize, gsize, stderr);
if (nfile)
fprintf(stderr, " -- replaced with %s", nfile);
fprintf(stderr, "\n");
fflush(stderr);
}
/* print test results */
static void
print_test(const char *file, int ok)
{
if (exit_value == 0 && ok == 0)
exit_value = 1;
fprintf(stderr, "%s:%s %s\n", file,
strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
fflush(stderr);
}
#endif
/* print a file's info ala --list */
/* eg:
compressed uncompressed ratio uncompressed_name
354841 1679360 78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
*/
static void
print_list(int fd, off_t out, const char *outfile, time_t ts)
{
static int first = 1;
#ifndef SMALL
static off_t in_tot, out_tot;
uint32_t crc = 0;
#endif
off_t in = 0, rv;
if (first) {
#ifndef SMALL
if (vflag)
printf("method crc date time ");
#endif
if (qflag == 0)
printf(" compressed uncompressed "
"ratio uncompressed_name\n");
}
first = 0;
/* print totals? */
#ifndef SMALL
if (fd == -1) {
in = in_tot;
out = out_tot;
} else
#endif
{
/* read the last 4 bytes - this is the uncompressed size */
rv = lseek(fd, (off_t)(-8), SEEK_END);
if (rv != -1) {
unsigned char buf[8];
uint32_t usize;
rv = read(fd, (char *)buf, sizeof(buf));
if (rv == -1)
maybe_warn("read of uncompressed size");
else if (rv != sizeof(buf))
maybe_warnx("read of uncompressed size");
else {
usize = buf[4] | buf[5] << 8 |
buf[6] << 16 | buf[7] << 24;
in = (off_t)usize;
#ifndef SMALL
crc = buf[0] | buf[1] << 8 |
buf[2] << 16 | buf[3] << 24;
#endif
}
}
}
#ifndef SMALL
if (vflag && fd == -1)
printf(" ");
else if (vflag) {
char *date = ctime(&ts);
/* skip the day, 1/100th second, and year */
date += 4;
date[12] = 0;
printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
}
in_tot += in;
out_tot += out;
#else
(void)&ts; /* XXX */
#endif
printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
print_ratio(in, out, stdout);
printf(" %s\n", outfile);
}
/* display the usage of NetBSD gzip */
static void
usage(void)
{
fprintf(stderr, "%s\n", gzip_version);
fprintf(stderr,
#ifdef SMALL
"usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n",
#else
"usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n"
" -1 --fast fastest (worst) compression\n"
" -2 .. -8 set compression level\n"
" -9 --best best (slowest) compression\n"
" -c --stdout write to stdout, keep original files\n"
" --to-stdout\n"
" -d --decompress uncompress files\n"
" --uncompress\n"
" -f --force force overwriting & compress links\n"
" -h --help display this help\n"
" -k --keep don't delete input files during operation\n"
" -l --list list compressed file contents\n"
" -N --name save or restore original file name and time stamp\n"
" -n --no-name don't save original file name or time stamp\n"
" -q --quiet output no warnings\n"
" -r --recursive recursively compress files in directories\n"
" -S .suf use suffix .suf instead of .gz\n"
" --suffix .suf\n"
" -t --test test compressed file\n"
" -V --version display program version\n"
" -v --verbose print extra statistics\n",
#endif
getprogname());
exit(0);
}
#ifndef SMALL
/* display the license information of FreeBSD gzip */
static void
display_license(void)
{
fprintf(stderr, "%s (based on NetBSD gzip 20060927)\n", gzip_version);
fprintf(stderr, "%s\n", gzip_copyright);
exit(0);
}
#endif
/* display the version of NetBSD gzip */
static void
display_version(void)
{
fprintf(stderr, "%s\n", gzip_version);
exit(0);
}
#ifndef NO_BZIP2_SUPPORT
#include "unbzip2.c"
#endif
#ifndef NO_COMPRESS_SUPPORT
#include "zuncompress.c"
#endif
#ifndef NO_PACK_SUPPORT
#include "unpack.c"
#endif
static ssize_t
read_retry(int fd, void *buf, size_t sz)
{
char *cp = buf;
size_t left = MIN(sz, (size_t) SSIZE_MAX);
while (left > 0) {
ssize_t ret;
ret = read(fd, cp, left);
if (ret == -1) {
return ret;
} else if (ret == 0) {
break; /* EOF */
}
cp += ret;
left -= ret;
}
return sz - left;
}
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