liblzf/lzf.c

/*
 * Copyright (c) 2006      Stefan Traby <stefan@hello-penguin.com>
 * Copyright (c) 2012      Marc Lehmann <schmorp@schmorp.de>
 * 
 * Redistribution and use in source and binary forms, with or without modifica-
 * tion, 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 MER-
 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
 * CIAL, 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 OTH-
 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License ("GPL") version 2 or any later version,
 * in which case the provisions of the GPL are applicable instead of
 * the above. If you wish to allow the use of your version of this file
 * only under the terms of the GPL and not to allow others to use your
 * version of this file under the BSD license, indicate your decision
 * by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL. If you do not delete the
 * provisions above, a recipient may use your version of this file under
 * either the BSD or the GPL.
 */

#include "config.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <limits.h>
#include "lzf.h"
#include "lzf_c_best.c"

#ifdef HAVE_GETOPT_H
# include <getopt.h>
#endif

#define BLOCKSIZE (1024 * 64 - 1)
#define MAX_BLOCKSIZE BLOCKSIZE

typedef unsigned char u8;

static off_t nr_read, nr_written;

static const char *imagename;
static enum { compress, uncompress, lzcat } mode = compress;
static int verbose = 0;
static int best = 0;
static int force = 0;
static long blocksize = BLOCKSIZE;

#ifdef HAVE_GETOPT_LONG

  struct option longopts[] = {
    {"compress"  , 0, 0, 'c'},
    {"decompress", 0, 0, 'd'},
    {"uncompress", 0, 0, 'd'},
    {"best"      , 0, 0, '9'},
    {"force"     , 0, 0, 'f'},
    {"help"      , 0, 0, 'h'},
    {"verbose"   , 0, 0, 'v'},
    {"blocksize" , 1, 0, 'b'},
    {0           , 0, 0,   0}
  };

  static const char *opt =
    "-c --compress    compress\n"
    "-d --decompress  decompress\n"
    "-9 --best        best compression\n"
    "-f --force       force overwrite of output file\n"
    "-h --help        give this help\n"
    "-v --verbose     verbose mode\n"
    "-b # --blocksize # set blocksize\n"
    "\n";

#else

  static const char *opt =
    "-c   compress\n"
    "-d   decompress\n"
    "-9   best compression\n"
    "-f   force overwrite of output file\n"
    "-h   give this help\n"
    "-v   verbose mode\n"
    "-b # set blocksize\n"
    "\n";

#endif

static void
usage (int rc)
{
  fprintf (stderr, "\n"
           "lzf, a very lightweight compression/decompression utility written by Stefan Traby.\n"
           "uses liblzf written by Marc Lehmann <schmorp@schmorp.de> You can find more info at\n"
           "http://liblzf.plan9.de/\n"
           "\n"
           "usage: lzf [-dufhvb9] [file ...]\n"
           "       unlzf [file ...]\n"
           "       lzcat [file ...]\n"
           "\n%s",
           opt);

  exit (rc);
}

static inline ssize_t
rread (int fd, void *buf, size_t len)
{
  ssize_t rc = 0, offset = 0;
  char *p = buf;

  while (len && (rc = read (fd, &p[offset], len)) > 0)
    {
      offset += rc;
      len -= rc;
    }

  nr_read += offset;

  if (rc < 0)
    return rc;

  return offset;
}

/* returns 0 if all written else -1 */
static inline ssize_t
wwrite (int fd, void *buf, size_t len)
{
  ssize_t rc;
  char *b = buf;
  size_t l = len;

  while (l)
    {
      rc = write (fd, b, l);
      if (rc < 0)
        {
          fprintf (stderr, "%s: write error: ", imagename);
          perror ("");
          return -1;
        }

      l -= rc;
      b += rc;
    }

  nr_written += len;
  return 0;
}

/*
 * Anatomy: an lzf file consists of any number of blocks in the following format:
 *
 * \x00   EOF (optional)
 * "ZV\0" 2-byte-usize <uncompressed data>
 * "ZV\1" 2-byte-csize 2-byte-usize <compressed data>
 * "ZV\2" 4-byte-crc32-0xdebb20e3 (NYI)
 */


#define TYPE0_HDR_SIZE 5
#define TYPE1_HDR_SIZE 7
#define MAX_HDR_SIZE 7
#define MIN_HDR_SIZE 5

static int
compress_fd (int from, int to)
{
  ssize_t us, cs, len;
  u8 buf1[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
  u8 buf2[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
  u8 *header;

  nr_read = nr_written = 0;
  while ((us = rread (from, &buf1[MAX_HDR_SIZE], blocksize)) > 0)
    {
      cs = (best ? lzf_compress_best : lzf_compress) (&buf1[MAX_HDR_SIZE], us, &buf2[MAX_HDR_SIZE], us > 4 ? us - 4 : us);
      if (cs)
        {
          header = &buf2[MAX_HDR_SIZE - TYPE1_HDR_SIZE];
          header[0] = 'Z';
          header[1] = 'V';
          header[2] = 1;
          header[3] = cs >> 8;
          header[4] = cs & 0xff;
          header[5] = us >> 8;
          header[6] = us & 0xff;
          len = cs + TYPE1_HDR_SIZE;
        }
      else
        {                       // write uncompressed
          header = &buf1[MAX_HDR_SIZE - TYPE0_HDR_SIZE];
          header[0] = 'Z';
          header[1] = 'V';
          header[2] = 0;
          header[3] = us >> 8;
          header[4] = us & 0xff;
          len = us + TYPE0_HDR_SIZE;
        }

      if (wwrite (to, header, len) == -1)
        return -1;
    }

  return 0;
}

static int
uncompress_fd (int from, int to)
{
  u8 header[MAX_HDR_SIZE];
  u8 buf1[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
  u8 buf2[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
  u8 *p;
  int l, rd;
  ssize_t rc, cs, us, bytes, over = 0;

  nr_read = nr_written = 0;
  while (1)
    {
      rc = rread (from, header + over, MAX_HDR_SIZE - over);
      if (rc < 0)
        {
          fprintf (stderr, "%s: read error: ", imagename);
          perror ("");
          return -1;
        }

      rc += over;
      over = 0;
      if (!rc || header[0] == 0)
        return 0;

      if (rc < MIN_HDR_SIZE || header[0] != 'Z' || header[1] != 'V')
        {
          fprintf (stderr, "%s: invalid data stream - magic not found or short header\n", imagename);
          return -1;
        }

      switch (header[2])
        {
          case 0:
            cs = -1;
            us = (header[3] << 8) | header[4];
            p = &header[TYPE0_HDR_SIZE];
            break;
          case 1:
            if (rc < TYPE1_HDR_SIZE)
              {
                goto short_read;
              }
            cs = (header[3] << 8) | header[4];
            us = (header[5] << 8) | header[6];
            p = &header[TYPE1_HDR_SIZE];
            break;
          default:
            fprintf (stderr, "%s: unknown blocktype\n", imagename);
            return -1;
        }

      bytes = cs == -1 ? us : cs;
      l = &header[rc] - p;

      if (l > 0)
        memcpy (buf1, p, l);

      if (l > bytes)
        {
          over = l - bytes;
          memmove (header, &p[bytes], over);
        }

      p = &buf1[l];
      rd = bytes - l;
      if (rd > 0)
        if ((rc = rread (from, p, rd)) != rd)
          goto short_read;

      if (cs == -1)
        {
          if (wwrite (to, buf1, us))
            return -1;
        }
      else
        {
          if (lzf_decompress (buf1, cs, buf2, us) != us)
            {
              fprintf (stderr, "%s: decompress: invalid stream - data corrupted\n", imagename);
              return -1;
            }

          if (wwrite (to, buf2, us))
            return -1;
        }
    }

  return 0;

short_read:
  fprintf (stderr, "%s: short data\n", imagename);
  return -1;
}

static int
open_out (const char *name)
{
  int fd;
  int m = O_EXCL;

  if (force)
    m = 0;

  fd = open (name, O_CREAT | O_WRONLY | O_TRUNC | m, 600);
#if defined(__MINGW32__)
  _setmode(fd, _O_BINARY);
#endif
  return fd;
}

static int
compose_name (const char *fname, char *oname)
{
  char *p;

  if (mode == compress)
    {
      if (strlen (fname) > PATH_MAX - 4)
        {
          fprintf (stderr, "%s: %s.lzf: name too long", imagename, fname);
          return -1;
        }

      strcpy (oname, fname);
      strcat (oname, ".lzf");
    }
  else
    {
      if (strlen (fname) > PATH_MAX)
        {
          fprintf (stderr, "%s: %s: name too long\n", imagename, fname);
          return -1;
        }

      strcpy (oname, fname);
      p = &oname[strlen (oname)] - 4;
      if (p < oname || strcmp (p, ".lzf"))
        {
          fprintf (stderr, "%s: %s: unknown suffix\n", imagename, fname);
          return -1;
        }

      *p = 0;
    }

  return 0;
}

static int
run_file (const char *fname)
{
  int fd, fd2;
  int rc;
  struct stat mystat;
  char oname[PATH_MAX + 1];

  if (mode != lzcat)
    if (compose_name (fname, oname))
      return -1;

#if !defined(__MINGW32__)
  rc = lstat (fname, &mystat);
#else
  rc = stat (fname, &mystat);
#endif
  fd = open (fname, O_RDONLY);
#if defined(__MINGW32__)
  _setmode(fd, _O_BINARY);
#endif
  if (rc || fd == -1)
    {
      fprintf (stderr, "%s: %s: ", imagename, fname);
      perror ("");
      return -1;
    }

  if (!S_ISREG (mystat.st_mode))
    {
      fprintf (stderr, "%s: %s: not a regular file.\n", imagename, fname);
      close (fd);
      return -1;
    }

  if (mode == lzcat)
    {
      rc = uncompress_fd (fd, 1);
      close (fd);
      return rc;
    }

  fd2 = open_out (oname);
  if (fd2 == -1)
    {
      fprintf (stderr, "%s: %s: ", imagename, oname);
      perror ("");
      close (fd);
      return -1;
    }

  if (mode == compress)
    {
      rc = compress_fd (fd, fd2);
      if (!rc && verbose)
        fprintf (stderr, "%s:  %5.1f%% -- replaced with %s\n",
                 fname, nr_read == 0 ? 0 : 100.0 - nr_written / ((double) nr_read / 100.0), oname);
    }
  else
    {
      rc = uncompress_fd (fd, fd2);
      if (!rc && verbose)
        fprintf (stderr, "%s:  %5.1f%% -- replaced with %s\n",
                 fname, nr_written == 0 ? 0 : 100.0 - nr_read / ((double) nr_written / 100.0), oname);
    }

#if !defined(__MINGW32__)
  fchmod (fd2, mystat.st_mode);
#else
  chmod (oname, mystat.st_mode);
#endif
  close (fd);
  close (fd2);

  if (!rc)
    unlink (fname);

  return rc;
}

int
main (int argc, char *argv[])
{
  char *p = argv[0];
  int optc;
  int rc = 0;

  errno = 0;
  p = getenv ("LZF_BLOCKSIZE");
  if (p)
    {
      blocksize = strtoul (p, 0, 0);
      if (errno || !blocksize || blocksize > MAX_BLOCKSIZE)
        blocksize = BLOCKSIZE;
    }

  p = strrchr (argv[0], '/');
  imagename = p ? ++p : argv[0];

  if (!strncmp (imagename, "un", 2) || !strncmp (imagename, "de", 2))
    mode = uncompress;

  if (strstr (imagename, "cat"))
    mode = lzcat;

#ifdef HAVE_GETOPT_LONG
  while ((optc = getopt_long (argc, argv, "cd9fhvb:", longopts, 0)) != -1)
#else
  while ((optc = getopt (argc, argv, "cd9fhvb:")) != -1)
#endif
    {
      switch (optc)
        {
          case 'c':
            mode = compress;
            break;
          case 'd':
            mode = uncompress;
            break;
          case '9':
            best = 1;
            break;
          case 'f':
            force = 1;
            break;
          case 'h':
            usage (0);
            break;
          case 'v':
            verbose = 1;
            break;
          case 'b':
            errno = 0;
            blocksize = strtoul (optarg, 0, 0);
            if (errno || !blocksize || blocksize > MAX_BLOCKSIZE)
              blocksize = BLOCKSIZE;
            break;
          default:
            usage (1);
            break;
        }
    }

  if (optind == argc)
    {                           // stdin stdout
      if (!force)
        {
          if ((mode == uncompress || mode == lzcat) && isatty (0))
            {
              fprintf (stderr, "%s: compressed data not read from a terminal. Use -f to force decompression.\n", imagename);
              exit (1);
            }
          if (mode == compress && isatty (1))
            {
              fprintf (stderr, "%s: compressed data not written to a terminal. Use -f to force compression.\n", imagename);
              exit (1);
            }
        }

      if (mode == compress)
        rc = compress_fd (0, 1);
      else
        rc = uncompress_fd (0, 1);

      exit (rc ? 1 : 0);
    }

  while (optind < argc)
    rc |= run_file (argv[optind++]);

  exit (rc ? 1 : 0);
}

Revision:	1.14
Committed:	Fri Mar 30 20:58:09 2012 UTC (12 years, 1 month ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.13:	+23 -11 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	/*
2	root	1.10	* Copyright (c) 2006 Stefan Traby <stefan@hello-penguin.com>
3	root	1.14	* Copyright (c) 2012 Marc Lehmann <schmorp@schmorp.de>
4	root	1.1	*
5			* Redistribution and use in source and binary forms, with or without modifica-
6			* tion, are permitted provided that the following conditions are met:
7			*
8			* 1. Redistributions of source code must retain the above copyright notice,
9			* this list of conditions and the following disclaimer.
10			*
11			* 2. Redistributions in binary form must reproduce the above copyright
12			* notice, this list of conditions and the following disclaimer in the
13			* documentation and/or other materials provided with the distribution.
14			*
15			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
16			* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
17			* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
18			* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
19			* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20			* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
21			* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22			* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
23			* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
24			* OF THE POSSIBILITY OF SUCH DAMAGE.
25	pcg	1.4	*
26			* Alternatively, the contents of this file may be used under the terms of
27	root	1.13	* the GNU General Public License ("GPL") version 2 or any later version,
28			* in which case the provisions of the GPL are applicable instead of
29			* the above. If you wish to allow the use of your version of this file
30			* only under the terms of the GPL and not to allow others to use your
31			* version of this file under the BSD license, indicate your decision
32			* by deleting the provisions above and replace them with the notice
33			* and other provisions required by the GPL. If you do not delete the
34			* provisions above, a recipient may use your version of this file under
35			* either the BSD or the GPL.
36	root	1.1	*/
37
38			#include "config.h"
39			#include <stdio.h>
40	root	1.10	#include <string.h>
41	root	1.1	#include <stdlib.h>
42	root	1.10	#include <unistd.h>
43			#include <sys/types.h>
44			#include <sys/stat.h>
45			#include <fcntl.h>
46			#include <errno.h>
47			#include <limits.h>
48			#include "lzf.h"
49	root	1.14	#include "lzf_c_best.c"
50	root	1.1
51	root	1.10	#ifdef HAVE_GETOPT_H
52			# include <getopt.h>
53			#endif
54	root	1.1
55	root	1.10	#define BLOCKSIZE (1024 * 64 - 1)
56			#define MAX_BLOCKSIZE BLOCKSIZE
57	root	1.1
58	pcg	1.3	typedef unsigned char u8;
59
60	root	1.10	static off_t nr_read, nr_written;
61
62			static const char *imagename;
63			static enum { compress, uncompress, lzcat } mode = compress;
64			static int verbose = 0;
65	root	1.14	static int best = 0;
66	root	1.10	static int force = 0;
67			static long blocksize = BLOCKSIZE;
68
69			#ifdef HAVE_GETOPT_LONG
70
71			struct option longopts[] = {
72	root	1.14	{"compress" , 0, 0, 'c'},
73	root	1.10	{"decompress", 0, 0, 'd'},
74			{"uncompress", 0, 0, 'd'},
75	root	1.14	{"best" , 0, 0, '9'},
76			{"force" , 0, 0, 'f'},
77			{"help" , 0, 0, 'h'},
78			{"verbose" , 0, 0, 'v'},
79			{"blocksize" , 1, 0, 'b'},
80			{0 , 0, 0, 0}
81	root	1.10	};
82
83			static const char *opt =
84			"-c --compress compress\n"
85			"-d --decompress decompress\n"
86	root	1.14	"-9 --best best compression\n"
87	root	1.10	"-f --force force overwrite of output file\n"
88	root	1.14	"-h --help give this help\n"
89			"-v --verbose verbose mode\n"
90			"-b # --blocksize # set blocksize\n"
91			"\n";
92	root	1.10
93			#else
94
95			static const char *opt =
96			"-c compress\n"
97			"-d decompress\n"
98	root	1.14	"-9 best compression\n"
99	root	1.10	"-f force overwrite of output file\n"
100			"-h give this help\n"
101			"-v verbose mode\n"
102			"-b # set blocksize\n"
103			"\n";
104
105			#endif
106
107	root	1.1	static void
108	root	1.10	usage (int rc)
109	root	1.1	{
110			fprintf (stderr, "\n"
111	root	1.10	"lzf, a very lightweight compression/decompression utility written by Stefan Traby.\n"
112			"uses liblzf written by Marc Lehmann <schmorp@schmorp.de> You can find more info at\n"
113	pcg	1.3	"http://liblzf.plan9.de/\n"
114	root	1.1	"\n"
115	root	1.14	"usage: lzf [-dufhvb9] [file ...]\n"
116	root	1.10	" unlzf [file ...]\n"
117			" lzcat [file ...]\n"
118			"\n%s",
119			opt);
120
121			exit (rc);
122			}
123
124			static inline ssize_t
125			rread (int fd, void *buf, size_t len)
126			{
127			ssize_t rc = 0, offset = 0;
128			char *p = buf;
129
130			while (len && (rc = read (fd, &p[offset], len)) > 0)
131			{
132			offset += rc;
133			len -= rc;
134			}
135
136			nr_read += offset;
137
138			if (rc < 0)
139			return rc;
140
141			return offset;
142			}
143
144			/* returns 0 if all written else -1 */
145			static inline ssize_t
146			wwrite (int fd, void *buf, size_t len)
147			{
148			ssize_t rc;
149			char *b = buf;
150			size_t l = len;
151
152			while (l)
153			{
154			rc = write (fd, b, l);
155			if (rc < 0)
156			{
157			fprintf (stderr, "%s: write error: ", imagename);
158			perror ("");
159			return -1;
160			}
161
162			l -= rc;
163			b += rc;
164			}
165	root	1.1
166	root	1.10	nr_written += len;
167			return 0;
168	root	1.1	}
169
170			/*
171			* Anatomy: an lzf file consists of any number of blocks in the following format:
172			*
173	root	1.8	* \x00 EOF (optional)
174	root	1.1	* "ZV\0" 2-byte-usize <uncompressed data>
175			* "ZV\1" 2-byte-csize 2-byte-usize <compressed data>
176			* "ZV\2" 4-byte-crc32-0xdebb20e3 (NYI)
177			*/
178
179	root	1.10
180			#define TYPE0_HDR_SIZE 5
181			#define TYPE1_HDR_SIZE 7
182			#define MAX_HDR_SIZE 7
183			#define MIN_HDR_SIZE 5
184
185			static int
186			compress_fd (int from, int to)
187	root	1.1	{
188	root	1.10	ssize_t us, cs, len;
189			u8 buf1[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
190			u8 buf2[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
191			u8 *header;
192
193			nr_read = nr_written = 0;
194			while ((us = rread (from, &buf1[MAX_HDR_SIZE], blocksize)) > 0)
195			{
196	root	1.14	cs = (best ? lzf_compress_best : lzf_compress) (&buf1[MAX_HDR_SIZE], us, &buf2[MAX_HDR_SIZE], us > 4 ? us - 4 : us);
197	root	1.10	if (cs)
198			{
199			header = &buf2[MAX_HDR_SIZE - TYPE1_HDR_SIZE];
200			header[0] = 'Z';
201			header[1] = 'V';
202			header[2] = 1;
203			header[3] = cs >> 8;
204			header[4] = cs & 0xff;
205			header[5] = us >> 8;
206			header[6] = us & 0xff;
207			len = cs + TYPE1_HDR_SIZE;
208			}
209			else
210			{ // write uncompressed
211			header = &buf1[MAX_HDR_SIZE - TYPE0_HDR_SIZE];
212			header[0] = 'Z';
213			header[1] = 'V';
214			header[2] = 0;
215			header[3] = us >> 8;
216			header[4] = us & 0xff;
217			len = us + TYPE0_HDR_SIZE;
218			}
219
220			if (wwrite (to, header, len) == -1)
221			return -1;
222			}
223
224			return 0;
225	root	1.1	}
226
227	root	1.10	static int
228			uncompress_fd (int from, int to)
229	root	1.1	{
230	root	1.10	u8 header[MAX_HDR_SIZE];
231			u8 buf1[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
232			u8 buf2[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
233			u8 *p;
234			int l, rd;
235			ssize_t rc, cs, us, bytes, over = 0;
236
237			nr_read = nr_written = 0;
238			while (1)
239			{
240			rc = rread (from, header + over, MAX_HDR_SIZE - over);
241			if (rc < 0)
242			{
243			fprintf (stderr, "%s: read error: ", imagename);
244			perror ("");
245			return -1;
246			}
247
248			rc += over;
249			over = 0;
250			if (!rc \|\| header[0] == 0)
251			return 0;
252
253			if (rc < MIN_HDR_SIZE \|\| header[0] != 'Z' \|\| header[1] != 'V')
254			{
255			fprintf (stderr, "%s: invalid data stream - magic not found or short header\n", imagename);
256			return -1;
257			}
258
259			switch (header[2])
260			{
261			case 0:
262			cs = -1;
263			us = (header[3] << 8) \| header[4];
264			p = &header[TYPE0_HDR_SIZE];
265			break;
266			case 1:
267			if (rc < TYPE1_HDR_SIZE)
268			{
269			goto short_read;
270			}
271			cs = (header[3] << 8) \| header[4];
272			us = (header[5] << 8) \| header[6];
273			p = &header[TYPE1_HDR_SIZE];
274			break;
275			default:
276			fprintf (stderr, "%s: unknown blocktype\n", imagename);
277			return -1;
278			}
279
280			bytes = cs == -1 ? us : cs;
281			l = &header[rc] - p;
282
283			if (l > 0)
284			memcpy (buf1, p, l);
285
286			if (l > bytes)
287			{
288			over = l - bytes;
289			memmove (header, &p[bytes], over);
290			}
291
292			p = &buf1[l];
293			rd = bytes - l;
294			if (rd > 0)
295			if ((rc = rread (from, p, rd)) != rd)
296			goto short_read;
297
298			if (cs == -1)
299			{
300			if (wwrite (to, buf1, us))
301			return -1;
302			}
303			else
304			{
305			if (lzf_decompress (buf1, cs, buf2, us) != us)
306			{
307			fprintf (stderr, "%s: decompress: invalid stream - data corrupted\n", imagename);
308			return -1;
309			}
310
311			if (wwrite (to, buf2, us))
312			return -1;
313			}
314			}
315
316			return 0;
317
318			short_read:
319			fprintf (stderr, "%s: short data\n", imagename);
320			return -1;
321			}
322
323			static int
324			open_out (const char *name)
325			{
326			int fd;
327			int m = O_EXCL;
328
329			if (force)
330			m = 0;
331
332			fd = open (name, O_CREAT \| O_WRONLY \| O_TRUNC \| m, 600);
333	root	1.11	#if defined(__MINGW32__)
334			_setmode(fd, _O_BINARY);
335			#endif
336	root	1.10	return fd;
337			}
338
339			static int
340			compose_name (const char fname, char oname)
341			{
342			char *p;
343
344			if (mode == compress)
345			{
346			if (strlen (fname) > PATH_MAX - 4)
347			{
348			fprintf (stderr, "%s: %s.lzf: name too long", imagename, fname);
349			return -1;
350			}
351
352			strcpy (oname, fname);
353			strcat (oname, ".lzf");
354			}
355			else
356			{
357			if (strlen (fname) > PATH_MAX)
358			{
359			fprintf (stderr, "%s: %s: name too long\n", imagename, fname);
360			return -1;
361			}
362
363			strcpy (oname, fname);
364			p = &oname[strlen (oname)] - 4;
365			if (p < oname \|\| strcmp (p, ".lzf"))
366			{
367			fprintf (stderr, "%s: %s: unknown suffix\n", imagename, fname);
368			return -1;
369			}
370
371			*p = 0;
372			}
373
374			return 0;
375			}
376
377			static int
378			run_file (const char *fname)
379			{
380			int fd, fd2;
381			int rc;
382			struct stat mystat;
383			char oname[PATH_MAX + 1];
384
385			if (mode != lzcat)
386			if (compose_name (fname, oname))
387			return -1;
388
389	root	1.11	#if !defined(__MINGW32__)
390	root	1.10	rc = lstat (fname, &mystat);
391	root	1.11	#else
392			rc = stat (fname, &mystat);
393			#endif
394	root	1.10	fd = open (fname, O_RDONLY);
395	root	1.11	#if defined(__MINGW32__)
396			_setmode(fd, _O_BINARY);
397			#endif
398	root	1.10	if (rc \|\| fd == -1)
399			{
400			fprintf (stderr, "%s: %s: ", imagename, fname);
401			perror ("");
402			return -1;
403			}
404
405			if (!S_ISREG (mystat.st_mode))
406			{
407			fprintf (stderr, "%s: %s: not a regular file.\n", imagename, fname);
408			close (fd);
409			return -1;
410			}
411
412			if (mode == lzcat)
413			{
414			rc = uncompress_fd (fd, 1);
415			close (fd);
416			return rc;
417			}
418
419			fd2 = open_out (oname);
420			if (fd2 == -1)
421			{
422			fprintf (stderr, "%s: %s: ", imagename, oname);
423			perror ("");
424			close (fd);
425			return -1;
426			}
427
428			if (mode == compress)
429			{
430			rc = compress_fd (fd, fd2);
431			if (!rc && verbose)
432			fprintf (stderr, "%s: %5.1f%% -- replaced with %s\n",
433			fname, nr_read == 0 ? 0 : 100.0 - nr_written / ((double) nr_read / 100.0), oname);
434			}
435			else
436			{
437			rc = uncompress_fd (fd, fd2);
438			if (!rc && verbose)
439			fprintf (stderr, "%s: %5.1f%% -- replaced with %s\n",
440			fname, nr_written == 0 ? 0 : 100.0 - nr_read / ((double) nr_written / 100.0), oname);
441			}
442
443	root	1.11	#if !defined(__MINGW32__)
444	root	1.10	fchmod (fd2, mystat.st_mode);
445	root	1.11	#else
446			chmod (oname, mystat.st_mode);
447			#endif
448	root	1.10	close (fd);
449			close (fd2);
450
451			if (!rc)
452			unlink (fname);
453
454			return rc;
455	root	1.1	}
456
457			int
458			main (int argc, char *argv[])
459			{
460	root	1.10	char *p = argv[0];
461			int optc;
462			int rc = 0;
463
464			errno = 0;
465			p = getenv ("LZF_BLOCKSIZE");
466			if (p)
467			{
468			blocksize = strtoul (p, 0, 0);
469			if (errno \|\| !blocksize \|\| blocksize > MAX_BLOCKSIZE)
470			blocksize = BLOCKSIZE;
471			}
472
473			p = strrchr (argv[0], '/');
474			imagename = p ? ++p : argv[0];
475
476			if (!strncmp (imagename, "un", 2) \|\| !strncmp (imagename, "de", 2))
477			mode = uncompress;
478
479			if (strstr (imagename, "cat"))
480			mode = lzcat;
481
482			#ifdef HAVE_GETOPT_LONG
483	root	1.14	while ((optc = getopt_long (argc, argv, "cd9fhvb:", longopts, 0)) != -1)
484	root	1.10	#else
485	root	1.14	while ((optc = getopt (argc, argv, "cd9fhvb:")) != -1)
486	root	1.10	#endif
487			{
488			switch (optc)
489			{
490			case 'c':
491			mode = compress;
492			break;
493			case 'd':
494			mode = uncompress;
495			break;
496	root	1.14	case '9':
497			best = 1;
498			break;
499	root	1.10	case 'f':
500			force = 1;
501			break;
502			case 'h':
503			usage (0);
504			break;
505			case 'v':
506			verbose = 1;
507			break;
508			case 'b':
509			errno = 0;
510			blocksize = strtoul (optarg, 0, 0);
511			if (errno \|\| !blocksize \|\| blocksize > MAX_BLOCKSIZE)
512			blocksize = BLOCKSIZE;
513			break;
514			default:
515			usage (1);
516			break;
517			}
518			}
519
520			if (optind == argc)
521			{ // stdin stdout
522			if (!force)
523			{
524			if ((mode == uncompress \|\| mode == lzcat) && isatty (0))
525			{
526			fprintf (stderr, "%s: compressed data not read from a terminal. Use -f to force decompression.\n", imagename);
527			exit (1);
528			}
529			if (mode == compress && isatty (1))
530			{
531			fprintf (stderr, "%s: compressed data not written to a terminal. Use -f to force compression.\n", imagename);
532			exit (1);
533			}
534			}
535
536			if (mode == compress)
537			rc = compress_fd (0, 1);
538			else
539			rc = uncompress_fd (0, 1);
540
541			exit (rc ? 1 : 0);
542			}
543
544			while (optind < argc)
545			rc \|= run_file (argv[optind++]);
546	root	1.1
547	root	1.10	exit (rc ? 1 : 0);
548	root	1.1	}
549	root	1.10