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:	1.15
Committed:	Mon Dec 10 20:21:28 2012 UTC (11 years, 9 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.14:	+4 -4 lines
Log Message:	ws
#	Content
1	/*
2	* Copyright (c) 2006 Stefan Traby <stefan@hello-penguin.com>
3	* Copyright (c) 2012 Marc Lehmann <schmorp@schmorp.de>
4	*
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	*
26	* Alternatively, the contents of this file may be used under the terms of
27	* 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	*/
37
38	#include "config.h"
39	#include <stdio.h>
40	#include <string.h>
41	#include <stdlib.h>
42	#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	#include "lzf_c_best.c"
50
51	#ifdef HAVE_GETOPT_H
52	# include <getopt.h>
53	#endif
54
55	#define BLOCKSIZE (1024 * 64 - 1)
56	#define MAX_BLOCKSIZE BLOCKSIZE
57
58	typedef unsigned char u8;
59
60	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	static int best = 0;
66	static int force = 0;
67	static long blocksize = BLOCKSIZE;
68
69	#ifdef HAVE_GETOPT_LONG
70
71	struct option longopts[] = {
72	{"compress" , 0, 0, 'c'},
73	{"decompress", 0, 0, 'd'},
74	{"uncompress", 0, 0, 'd'},
75	{"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	};
82
83	static const char *opt =
84	"-c --compress compress\n"
85	"-d --decompress decompress\n"
86	"-9 --best best compression\n"
87	"-f --force force overwrite of output file\n"
88	"-h --help give this help\n"
89	"-v --verbose verbose mode\n"
90	"-b # --blocksize # set blocksize\n"
91	"\n";
92
93	#else
94
95	static const char *opt =
96	"-c compress\n"
97	"-d decompress\n"
98	"-9 best compression\n"
99	"-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	static void
108	usage (int rc)
109	{
110	fprintf (stderr, "\n"
111	"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	"http://liblzf.plan9.de/\n"
114	"\n"
115	"usage: lzf [-dufhvb9] [file ...]\n"
116	" 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
166	nr_written += len;
167	return 0;
168	}
169
170	/*
171	* Anatomy: an lzf file consists of any number of blocks in the following format:
172	*
173	* \x00 EOF (optional)
174	* "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
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	{
188	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	cs = (best ? lzf_compress_best : lzf_compress) (&buf1[MAX_HDR_SIZE], us, &buf2[MAX_HDR_SIZE], us > 4 ? us - 4 : us);
197	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	}
226
227	static int
228	uncompress_fd (int from, int to)
229	{
230	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	#if defined(__MINGW32__)
334	_setmode(fd, _O_BINARY);
335	#endif
336	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	#if !defined(__MINGW32__)
390	rc = lstat (fname, &mystat);
391	#else
392	rc = stat (fname, &mystat);
393	#endif
394	fd = open (fname, O_RDONLY);
395	#if defined(__MINGW32__)
396	_setmode(fd, _O_BINARY);
397	#endif
398	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	#if !defined(__MINGW32__)
444	fchmod (fd2, mystat.st_mode);
445	#else
446	chmod (oname, mystat.st_mode);
447	#endif
448	close (fd);
449	close (fd2);
450
451	if (!rc)
452	unlink (fname);
453
454	return rc;
455	}
456
457	int
458	main (int argc, char *argv[])
459	{
460	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	while ((optc = getopt_long (argc, argv, "cd9fhvb:", longopts, 0)) != -1)
484	#else
485	while ((optc = getopt (argc, argv, "cd9fhvb:")) != -1)
486	#endif
487	{
488	switch (optc)
489	{
490	case 'c':
491	mode = compress;
492	break;
493	case 'd':
494	mode = uncompress;
495	break;
496	case '9':
497	best = 1;
498	break;
499	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
547	exit (rc ? 1 : 0);
548	}
549