liblzf/lzf.c

/*
 * Copyright (c) 2006      Stefan Traby <stefan@hello-penguin.com>
 * 
 * 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"

#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 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'},
    {"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"
    "-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"
    "-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 [-dufhvb] [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 = 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, "cdfhvb:", longopts, 0)) != -1)
#else
  while ((optc = getopt (argc, argv, "cdfhvb:")) != -1)
#endif
    {
      switch (optc)
        {
          case 'c':
            mode = compress;
            break;
          case 'd':
            mode = uncompress;
            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:	1.13
Committed:	Mon Nov 5 23:28:40 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-3_6, rel-3_5, rel-3_4, rel-3_3, rel-3_1, rel-3_0
Changes since 1.12:	+9 -8 lines
Log Message:	* empty log message *
#	Content
1	/*
2	* Copyright (c) 2006 Stefan Traby <stefan@hello-penguin.com>
3	*
4	* Redistribution and use in source and binary forms, with or without modifica-
5	* tion, are permitted provided that the following conditions are met:
6	*
7	* 1. Redistributions of source code must retain the above copyright notice,
8	* this list of conditions and the following disclaimer.
9	*
10	* 2. Redistributions in binary form must reproduce the above copyright
11	* notice, this list of conditions and the following disclaimer in the
12	* documentation and/or other materials provided with the distribution.
13	*
14	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
15	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
16	* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
17	* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
18	* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
20	* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
21	* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
22	* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
23	* OF THE POSSIBILITY OF SUCH DAMAGE.
24	*
25	* Alternatively, the contents of this file may be used under the terms of
26	* the GNU General Public License ("GPL") version 2 or any later version,
27	* in which case the provisions of the GPL are applicable instead of
28	* the above. If you wish to allow the use of your version of this file
29	* only under the terms of the GPL and not to allow others to use your
30	* version of this file under the BSD license, indicate your decision
31	* by deleting the provisions above and replace them with the notice
32	* and other provisions required by the GPL. If you do not delete the
33	* provisions above, a recipient may use your version of this file under
34	* either the BSD or the GPL.
35	*/
36
37	#include "config.h"
38	#include <stdio.h>
39	#include <string.h>
40	#include <stdlib.h>
41	#include <unistd.h>
42	#include <sys/types.h>
43	#include <sys/stat.h>
44	#include <fcntl.h>
45	#include <errno.h>
46	#include <limits.h>
47	#include "lzf.h"
48
49	#ifdef HAVE_GETOPT_H
50	# include <getopt.h>
51	#endif
52
53	#define BLOCKSIZE (1024 * 64 - 1)
54	#define MAX_BLOCKSIZE BLOCKSIZE
55
56	typedef unsigned char u8;
57
58	static off_t nr_read, nr_written;
59
60	static const char *imagename;
61	static enum { compress, uncompress, lzcat } mode = compress;
62	static int verbose = 0;
63	static int force = 0;
64	static long blocksize = BLOCKSIZE;
65
66	#ifdef HAVE_GETOPT_LONG
67
68	struct option longopts[] = {
69	{"compress", 0, 0, 'c'},
70	{"decompress", 0, 0, 'd'},
71	{"uncompress", 0, 0, 'd'},
72	{"force", 0, 0, 'f'},
73	{"help", 0, 0, 'h'},
74	{"verbose", 0, 0, 'v'},
75	{"blocksize", 1, 0, 'b'},
76	{0, 0, 0, 0}
77	};
78
79	static const char *opt =
80	"-c --compress compress\n"
81	"-d --decompress decompress\n"
82	"-f --force force overwrite of output file\n"
83	"-h --help give this help\n" "-v --verbose verbose mode\n" "-b # --blocksize # set blocksize\n" "\n";
84
85	#else
86
87	static const char *opt =
88	"-c compress\n"
89	"-d decompress\n"
90	"-f force overwrite of output file\n"
91	"-h give this help\n"
92	"-v verbose mode\n"
93	"-b # set blocksize\n"
94	"\n";
95
96	#endif
97
98	static void
99	usage (int rc)
100	{
101	fprintf (stderr, "\n"
102	"lzf, a very lightweight compression/decompression utility written by Stefan Traby.\n"
103	"uses liblzf written by Marc Lehmann <schmorp@schmorp.de> You can find more info at\n"
104	"http://liblzf.plan9.de/\n"
105	"\n"
106	"usage: lzf [-dufhvb] [file ...]\n"
107	" unlzf [file ...]\n"
108	" lzcat [file ...]\n"
109	"\n%s",
110	opt);
111
112	exit (rc);
113	}
114
115	static inline ssize_t
116	rread (int fd, void *buf, size_t len)
117	{
118	ssize_t rc = 0, offset = 0;
119	char *p = buf;
120
121	while (len && (rc = read (fd, &p[offset], len)) > 0)
122	{
123	offset += rc;
124	len -= rc;
125	}
126
127	nr_read += offset;
128
129	if (rc < 0)
130	return rc;
131
132	return offset;
133	}
134
135	/* returns 0 if all written else -1 */
136	static inline ssize_t
137	wwrite (int fd, void *buf, size_t len)
138	{
139	ssize_t rc;
140	char *b = buf;
141	size_t l = len;
142
143	while (l)
144	{
145	rc = write (fd, b, l);
146	if (rc < 0)
147	{
148	fprintf (stderr, "%s: write error: ", imagename);
149	perror ("");
150	return -1;
151	}
152
153	l -= rc;
154	b += rc;
155	}
156
157	nr_written += len;
158	return 0;
159	}
160
161	/*
162	* Anatomy: an lzf file consists of any number of blocks in the following format:
163	*
164	* \x00 EOF (optional)
165	* "ZV\0" 2-byte-usize <uncompressed data>
166	* "ZV\1" 2-byte-csize 2-byte-usize <compressed data>
167	* "ZV\2" 4-byte-crc32-0xdebb20e3 (NYI)
168	*/
169
170
171	#define TYPE0_HDR_SIZE 5
172	#define TYPE1_HDR_SIZE 7
173	#define MAX_HDR_SIZE 7
174	#define MIN_HDR_SIZE 5
175
176	static int
177	compress_fd (int from, int to)
178	{
179	ssize_t us, cs, len;
180	u8 buf1[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
181	u8 buf2[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
182	u8 *header;
183
184	nr_read = nr_written = 0;
185	while ((us = rread (from, &buf1[MAX_HDR_SIZE], blocksize)) > 0)
186	{
187	cs = lzf_compress (&buf1[MAX_HDR_SIZE], us, &buf2[MAX_HDR_SIZE], us > 4 ? us - 4 : us);
188	if (cs)
189	{
190	header = &buf2[MAX_HDR_SIZE - TYPE1_HDR_SIZE];
191	header[0] = 'Z';
192	header[1] = 'V';
193	header[2] = 1;
194	header[3] = cs >> 8;
195	header[4] = cs & 0xff;
196	header[5] = us >> 8;
197	header[6] = us & 0xff;
198	len = cs + TYPE1_HDR_SIZE;
199	}
200	else
201	{ // write uncompressed
202	header = &buf1[MAX_HDR_SIZE - TYPE0_HDR_SIZE];
203	header[0] = 'Z';
204	header[1] = 'V';
205	header[2] = 0;
206	header[3] = us >> 8;
207	header[4] = us & 0xff;
208	len = us + TYPE0_HDR_SIZE;
209	}
210
211	if (wwrite (to, header, len) == -1)
212	return -1;
213	}
214
215	return 0;
216	}
217
218	static int
219	uncompress_fd (int from, int to)
220	{
221	u8 header[MAX_HDR_SIZE];
222	u8 buf1[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
223	u8 buf2[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
224	u8 *p;
225	int l, rd;
226	ssize_t rc, cs, us, bytes, over = 0;
227
228	nr_read = nr_written = 0;
229	while (1)
230	{
231	rc = rread (from, header + over, MAX_HDR_SIZE - over);
232	if (rc < 0)
233	{
234	fprintf (stderr, "%s: read error: ", imagename);
235	perror ("");
236	return -1;
237	}
238
239	rc += over;
240	over = 0;
241	if (!rc \|\| header[0] == 0)
242	return 0;
243
244	if (rc < MIN_HDR_SIZE \|\| header[0] != 'Z' \|\| header[1] != 'V')
245	{
246	fprintf (stderr, "%s: invalid data stream - magic not found or short header\n", imagename);
247	return -1;
248	}
249
250	switch (header[2])
251	{
252	case 0:
253	cs = -1;
254	us = (header[3] << 8) \| header[4];
255	p = &header[TYPE0_HDR_SIZE];
256	break;
257	case 1:
258	if (rc < TYPE1_HDR_SIZE)
259	{
260	goto short_read;
261	}
262	cs = (header[3] << 8) \| header[4];
263	us = (header[5] << 8) \| header[6];
264	p = &header[TYPE1_HDR_SIZE];
265	break;
266	default:
267	fprintf (stderr, "%s: unknown blocktype\n", imagename);
268	return -1;
269	}
270
271	bytes = cs == -1 ? us : cs;
272	l = &header[rc] - p;
273
274	if (l > 0)
275	memcpy (buf1, p, l);
276
277	if (l > bytes)
278	{
279	over = l - bytes;
280	memmove (header, &p[bytes], over);
281	}
282
283	p = &buf1[l];
284	rd = bytes - l;
285	if (rd > 0)
286	if ((rc = rread (from, p, rd)) != rd)
287	goto short_read;
288
289	if (cs == -1)
290	{
291	if (wwrite (to, buf1, us))
292	return -1;
293	}
294	else
295	{
296	if (lzf_decompress (buf1, cs, buf2, us) != us)
297	{
298	fprintf (stderr, "%s: decompress: invalid stream - data corrupted\n", imagename);
299	return -1;
300	}
301
302	if (wwrite (to, buf2, us))
303	return -1;
304	}
305	}
306
307	return 0;
308
309	short_read:
310	fprintf (stderr, "%s: short data\n", imagename);
311	return -1;
312	}
313
314	static int
315	open_out (const char *name)
316	{
317	int fd;
318	int m = O_EXCL;
319
320	if (force)
321	m = 0;
322
323	fd = open (name, O_CREAT \| O_WRONLY \| O_TRUNC \| m, 600);
324	#if defined(__MINGW32__)
325	_setmode(fd, _O_BINARY);
326	#endif
327	return fd;
328	}
329
330	static int
331	compose_name (const char fname, char oname)
332	{
333	char *p;
334
335	if (mode == compress)
336	{
337	if (strlen (fname) > PATH_MAX - 4)
338	{
339	fprintf (stderr, "%s: %s.lzf: name too long", imagename, fname);
340	return -1;
341	}
342
343	strcpy (oname, fname);
344	strcat (oname, ".lzf");
345	}
346	else
347	{
348	if (strlen (fname) > PATH_MAX)
349	{
350	fprintf (stderr, "%s: %s: name too long\n", imagename, fname);
351	return -1;
352	}
353
354	strcpy (oname, fname);
355	p = &oname[strlen (oname)] - 4;
356	if (p < oname \|\| strcmp (p, ".lzf"))
357	{
358	fprintf (stderr, "%s: %s: unknown suffix\n", imagename, fname);
359	return -1;
360	}
361
362	*p = 0;
363	}
364
365	return 0;
366	}
367
368	static int
369	run_file (const char *fname)
370	{
371	int fd, fd2;
372	int rc;
373	struct stat mystat;
374	char oname[PATH_MAX + 1];
375
376	if (mode != lzcat)
377	if (compose_name (fname, oname))
378	return -1;
379
380	#if !defined(__MINGW32__)
381	rc = lstat (fname, &mystat);
382	#else
383	rc = stat (fname, &mystat);
384	#endif
385	fd = open (fname, O_RDONLY);
386	#if defined(__MINGW32__)
387	_setmode(fd, _O_BINARY);
388	#endif
389	if (rc \|\| fd == -1)
390	{
391	fprintf (stderr, "%s: %s: ", imagename, fname);
392	perror ("");
393	return -1;
394	}
395
396	if (!S_ISREG (mystat.st_mode))
397	{
398	fprintf (stderr, "%s: %s: not a regular file.\n", imagename, fname);
399	close (fd);
400	return -1;
401	}
402
403	if (mode == lzcat)
404	{
405	rc = uncompress_fd (fd, 1);
406	close (fd);
407	return rc;
408	}
409
410	fd2 = open_out (oname);
411	if (fd2 == -1)
412	{
413	fprintf (stderr, "%s: %s: ", imagename, oname);
414	perror ("");
415	close (fd);
416	return -1;
417	}
418
419	if (mode == compress)
420	{
421	rc = compress_fd (fd, fd2);
422	if (!rc && verbose)
423	fprintf (stderr, "%s: %5.1f%% -- replaced with %s\n",
424	fname, nr_read == 0 ? 0 : 100.0 - nr_written / ((double) nr_read / 100.0), oname);
425	}
426	else
427	{
428	rc = uncompress_fd (fd, fd2);
429	if (!rc && verbose)
430	fprintf (stderr, "%s: %5.1f%% -- replaced with %s\n",
431	fname, nr_written == 0 ? 0 : 100.0 - nr_read / ((double) nr_written / 100.0), oname);
432	}
433
434	#if !defined(__MINGW32__)
435	fchmod (fd2, mystat.st_mode);
436	#else
437	chmod (oname, mystat.st_mode);
438	#endif
439	close (fd);
440	close (fd2);
441
442	if (!rc)
443	unlink (fname);
444
445	return rc;
446	}
447
448	int
449	main (int argc, char *argv[])
450	{
451	char *p = argv[0];
452	int optc;
453	int rc = 0;
454
455	errno = 0;
456	p = getenv ("LZF_BLOCKSIZE");
457	if (p)
458	{
459	blocksize = strtoul (p, 0, 0);
460	if (errno \|\| !blocksize \|\| blocksize > MAX_BLOCKSIZE)
461	blocksize = BLOCKSIZE;
462	}
463
464	p = strrchr (argv[0], '/');
465	imagename = p ? ++p : argv[0];
466
467	if (!strncmp (imagename, "un", 2) \|\| !strncmp (imagename, "de", 2))
468	mode = uncompress;
469
470	if (strstr (imagename, "cat"))
471	mode = lzcat;
472
473	#ifdef HAVE_GETOPT_LONG
474	while ((optc = getopt_long (argc, argv, "cdfhvb:", longopts, 0)) != -1)
475	#else
476	while ((optc = getopt (argc, argv, "cdfhvb:")) != -1)
477	#endif
478	{
479	switch (optc)
480	{
481	case 'c':
482	mode = compress;
483	break;
484	case 'd':
485	mode = uncompress;
486	break;
487	case 'f':
488	force = 1;
489	break;
490	case 'h':
491	usage (0);
492	break;
493	case 'v':
494	verbose = 1;
495	break;
496	case 'b':
497	errno = 0;
498	blocksize = strtoul (optarg, 0, 0);
499	if (errno \|\| !blocksize \|\| blocksize > MAX_BLOCKSIZE)
500	blocksize = BLOCKSIZE;
501	break;
502	default:
503	usage (1);
504	break;
505	}
506	}
507
508	if (optind == argc)
509	{ // stdin stdout
510	if (!force)
511	{
512	if ((mode == uncompress \|\| mode == lzcat) && isatty (0))
513	{
514	fprintf (stderr, "%s: compressed data not read from a terminal. Use -f to force decompression.\n", imagename);
515	exit (1);
516	}
517	if (mode == compress && isatty (1))
518	{
519	fprintf (stderr, "%s: compressed data not written to a terminal. Use -f to force compression.\n", imagename);
520	exit (1);
521	}
522	}
523
524	if (mode == compress)
525	rc = compress_fd (0, 1);
526	else
527	rc = uncompress_fd (0, 1);
528
529	exit (rc ? 1 : 0);
530	}
531
532	while (optind < argc)
533	rc \|= run_file (argv[optind++]);
534
535	exit (rc ? 1 : 0);
536	}
537