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.
 * 
 *   3.  The name of the author may not be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
 * 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 version 2 (the "GPL"), 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 License.
 */

#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);
  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;

  rc = lstat (fname, &mystat);
  fd = open (fname, O_RDONLY);
  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);
    }

  fchmod (fd2, mystat.st_mode);
  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:	1.10
Committed:	Thu Oct 12 14:38:24 2006 UTC (17 years, 7 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-2_0
Changes since 1.9:	+453 -191 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	* 3. The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.
16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19	* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20	* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21	* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23	* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24	* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25	* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26	* OF THE POSSIBILITY OF SUCH DAMAGE.
27	*
28	* Alternatively, the contents of this file may be used under the terms of
29	* the GNU General Public License version 2 (the "GPL"), in which case the
30	* provisions of the GPL are applicable instead of the above. If you wish to
31	* allow the use of your version of this file only under the terms of the
32	* GPL and not to allow others to use your version of this file under the
33	* BSD license, indicate your decision by deleting the provisions above and
34	* replace them with the notice and other provisions required by the GPL. If
35	* you do not delete the provisions above, a recipient may use your version
36	* of this file under either the BSD or the GPL License.
37	*/
38
39	#include "config.h"
40	#include <stdio.h>
41	#include <string.h>
42	#include <stdlib.h>
43	#include <unistd.h>
44	#include <sys/types.h>
45	#include <sys/stat.h>
46	#include <fcntl.h>
47	#include <errno.h>
48	#include <limits.h>
49	#include "lzf.h"
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 force = 0;
66	static long blocksize = BLOCKSIZE;
67
68	#ifdef HAVE_GETOPT_LONG
69
70	struct option longopts[] = {
71	{"compress", 0, 0, 'c'},
72	{"decompress", 0, 0, 'd'},
73	{"uncompress", 0, 0, 'd'},
74	{"force", 0, 0, 'f'},
75	{"help", 0, 0, 'h'},
76	{"verbose", 0, 0, 'v'},
77	{"blocksize", 1, 0, 'b'},
78	{0, 0, 0, 0}
79	};
80
81	static const char *opt =
82	"-c --compress compress\n"
83	"-d --decompress decompress\n"
84	"-f --force force overwrite of output file\n"
85	"-h --help give this help\n" "-v --verbose verbose mode\n" "-b # --blocksize # set blocksize\n" "\n";
86
87	#else
88
89	static const char *opt =
90	"-c compress\n"
91	"-d decompress\n"
92	"-f force overwrite of output file\n"
93	"-h give this help\n"
94	"-v verbose mode\n"
95	"-b # set blocksize\n"
96	"\n";
97
98	#endif
99
100	static void
101	usage (int rc)
102	{
103	fprintf (stderr, "\n"
104	"lzf, a very lightweight compression/decompression utility written by Stefan Traby.\n"
105	"uses liblzf written by Marc Lehmann <schmorp@schmorp.de> You can find more info at\n"
106	"http://liblzf.plan9.de/\n"
107	"\n"
108	"usage: lzf [-dufhvb] [file ...]\n"
109	" unlzf [file ...]\n"
110	" lzcat [file ...]\n"
111	"\n%s",
112	opt);
113
114	exit (rc);
115	}
116
117	static inline ssize_t
118	rread (int fd, void *buf, size_t len)
119	{
120	ssize_t rc = 0, offset = 0;
121	char *p = buf;
122
123	while (len && (rc = read (fd, &p[offset], len)) > 0)
124	{
125	offset += rc;
126	len -= rc;
127	}
128
129	nr_read += offset;
130
131	if (rc < 0)
132	return rc;
133
134	return offset;
135	}
136
137	/* returns 0 if all written else -1 */
138	static inline ssize_t
139	wwrite (int fd, void *buf, size_t len)
140	{
141	ssize_t rc;
142	char *b = buf;
143	size_t l = len;
144
145	while (l)
146	{
147	rc = write (fd, b, l);
148	if (rc < 0)
149	{
150	fprintf (stderr, "%s: write error: ", imagename);
151	perror ("");
152	return -1;
153	}
154
155	l -= rc;
156	b += rc;
157	}
158
159	nr_written += len;
160	return 0;
161	}
162
163	/*
164	* Anatomy: an lzf file consists of any number of blocks in the following format:
165	*
166	* \x00 EOF (optional)
167	* "ZV\0" 2-byte-usize <uncompressed data>
168	* "ZV\1" 2-byte-csize 2-byte-usize <compressed data>
169	* "ZV\2" 4-byte-crc32-0xdebb20e3 (NYI)
170	*/
171
172
173	#define TYPE0_HDR_SIZE 5
174	#define TYPE1_HDR_SIZE 7
175	#define MAX_HDR_SIZE 7
176	#define MIN_HDR_SIZE 5
177
178	static int
179	compress_fd (int from, int to)
180	{
181	ssize_t us, cs, len;
182	u8 buf1[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
183	u8 buf2[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
184	u8 *header;
185
186	nr_read = nr_written = 0;
187	while ((us = rread (from, &buf1[MAX_HDR_SIZE], blocksize)) > 0)
188	{
189	cs = lzf_compress (&buf1[MAX_HDR_SIZE], us, &buf2[MAX_HDR_SIZE], us > 4 ? us - 4 : us);
190	if (cs)
191	{
192	header = &buf2[MAX_HDR_SIZE - TYPE1_HDR_SIZE];
193	header[0] = 'Z';
194	header[1] = 'V';
195	header[2] = 1;
196	header[3] = cs >> 8;
197	header[4] = cs & 0xff;
198	header[5] = us >> 8;
199	header[6] = us & 0xff;
200	len = cs + TYPE1_HDR_SIZE;
201	}
202	else
203	{ // write uncompressed
204	header = &buf1[MAX_HDR_SIZE - TYPE0_HDR_SIZE];
205	header[0] = 'Z';
206	header[1] = 'V';
207	header[2] = 0;
208	header[3] = us >> 8;
209	header[4] = us & 0xff;
210	len = us + TYPE0_HDR_SIZE;
211	}
212
213	if (wwrite (to, header, len) == -1)
214	return -1;
215	}
216
217	return 0;
218	}
219
220	static int
221	uncompress_fd (int from, int to)
222	{
223	u8 header[MAX_HDR_SIZE];
224	u8 buf1[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
225	u8 buf2[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
226	u8 *p;
227	int l, rd;
228	ssize_t rc, cs, us, bytes, over = 0;
229
230	nr_read = nr_written = 0;
231	while (1)
232	{
233	rc = rread (from, header + over, MAX_HDR_SIZE - over);
234	if (rc < 0)
235	{
236	fprintf (stderr, "%s: read error: ", imagename);
237	perror ("");
238	return -1;
239	}
240
241	rc += over;
242	over = 0;
243	if (!rc \|\| header[0] == 0)
244	return 0;
245
246	if (rc < MIN_HDR_SIZE \|\| header[0] != 'Z' \|\| header[1] != 'V')
247	{
248	fprintf (stderr, "%s: invalid data stream - magic not found or short header\n", imagename);
249	return -1;
250	}
251
252	switch (header[2])
253	{
254	case 0:
255	cs = -1;
256	us = (header[3] << 8) \| header[4];
257	p = &header[TYPE0_HDR_SIZE];
258	break;
259	case 1:
260	if (rc < TYPE1_HDR_SIZE)
261	{
262	goto short_read;
263	}
264	cs = (header[3] << 8) \| header[4];
265	us = (header[5] << 8) \| header[6];
266	p = &header[TYPE1_HDR_SIZE];
267	break;
268	default:
269	fprintf (stderr, "%s: unknown blocktype\n", imagename);
270	return -1;
271	}
272
273	bytes = cs == -1 ? us : cs;
274	l = &header[rc] - p;
275
276	if (l > 0)
277	memcpy (buf1, p, l);
278
279	if (l > bytes)
280	{
281	over = l - bytes;
282	memmove (header, &p[bytes], over);
283	}
284
285	p = &buf1[l];
286	rd = bytes - l;
287	if (rd > 0)
288	if ((rc = rread (from, p, rd)) != rd)
289	goto short_read;
290
291	if (cs == -1)
292	{
293	if (wwrite (to, buf1, us))
294	return -1;
295	}
296	else
297	{
298	if (lzf_decompress (buf1, cs, buf2, us) != us)
299	{
300	fprintf (stderr, "%s: decompress: invalid stream - data corrupted\n", imagename);
301	return -1;
302	}
303
304	if (wwrite (to, buf2, us))
305	return -1;
306	}
307	}
308
309	return 0;
310
311	short_read:
312	fprintf (stderr, "%s: short data\n", imagename);
313	return -1;
314	}
315
316	static int
317	open_out (const char *name)
318	{
319	int fd;
320	int m = O_EXCL;
321
322	if (force)
323	m = 0;
324
325	fd = open (name, O_CREAT \| O_WRONLY \| O_TRUNC \| m, 600);
326	return fd;
327	}
328
329	static int
330	compose_name (const char fname, char oname)
331	{
332	char *p;
333
334	if (mode == compress)
335	{
336	if (strlen (fname) > PATH_MAX - 4)
337	{
338	fprintf (stderr, "%s: %s.lzf: name too long", imagename, fname);
339	return -1;
340	}
341
342	strcpy (oname, fname);
343	strcat (oname, ".lzf");
344	}
345	else
346	{
347	if (strlen (fname) > PATH_MAX)
348	{
349	fprintf (stderr, "%s: %s: name too long\n", imagename, fname);
350	return -1;
351	}
352
353	strcpy (oname, fname);
354	p = &oname[strlen (oname)] - 4;
355	if (p < oname \|\| strcmp (p, ".lzf"))
356	{
357	fprintf (stderr, "%s: %s: unknown suffix\n", imagename, fname);
358	return -1;
359	}
360
361	*p = 0;
362	}
363
364	return 0;
365	}
366
367	static int
368	run_file (const char *fname)
369	{
370	int fd, fd2;
371	int rc;
372	struct stat mystat;
373	char oname[PATH_MAX + 1];
374
375	if (mode != lzcat)
376	if (compose_name (fname, oname))
377	return -1;
378
379	rc = lstat (fname, &mystat);
380	fd = open (fname, O_RDONLY);
381	if (rc \|\| fd == -1)
382	{
383	fprintf (stderr, "%s: %s: ", imagename, fname);
384	perror ("");
385	return -1;
386	}
387
388	if (!S_ISREG (mystat.st_mode))
389	{
390	fprintf (stderr, "%s: %s: not a regular file.\n", imagename, fname);
391	close (fd);
392	return -1;
393	}
394
395	if (mode == lzcat)
396	{
397	rc = uncompress_fd (fd, 1);
398	close (fd);
399	return rc;
400	}
401
402	fd2 = open_out (oname);
403	if (fd2 == -1)
404	{
405	fprintf (stderr, "%s: %s: ", imagename, oname);
406	perror ("");
407	close (fd);
408	return -1;
409	}
410
411	if (mode == compress)
412	{
413	rc = compress_fd (fd, fd2);
414	if (!rc && verbose)
415	fprintf (stderr, "%s: %5.1f%% -- replaced with %s\n",
416	fname, nr_read == 0 ? 0 : 100.0 - nr_written / ((double) nr_read / 100.0), oname);
417	}
418	else
419	{
420	rc = uncompress_fd (fd, fd2);
421	if (!rc && verbose)
422	fprintf (stderr, "%s: %5.1f%% -- replaced with %s\n",
423	fname, nr_written == 0 ? 0 : 100.0 - nr_read / ((double) nr_written / 100.0), oname);
424	}
425
426	fchmod (fd2, mystat.st_mode);
427	close (fd);
428	close (fd2);
429
430	if (!rc)
431	unlink (fname);
432
433	return rc;
434	}
435
436	int
437	main (int argc, char *argv[])
438	{
439	char *p = argv[0];
440	int optc;
441	int rc = 0;
442
443	errno = 0;
444	p = getenv ("LZF_BLOCKSIZE");
445	if (p)
446	{
447	blocksize = strtoul (p, 0, 0);
448	if (errno \|\| !blocksize \|\| blocksize > MAX_BLOCKSIZE)
449	blocksize = BLOCKSIZE;
450	}
451
452	p = strrchr (argv[0], '/');
453	imagename = p ? ++p : argv[0];
454
455	if (!strncmp (imagename, "un", 2) \|\| !strncmp (imagename, "de", 2))
456	mode = uncompress;
457
458	if (strstr (imagename, "cat"))
459	mode = lzcat;
460
461	#ifdef HAVE_GETOPT_LONG
462	while ((optc = getopt_long (argc, argv, "cdfhvb:", longopts, 0)) != -1)
463	#else
464	while ((optc = getopt (argc, argv, "cdfhvb:")) != -1)
465	#endif
466	{
467	switch (optc)
468	{
469	case 'c':
470	mode = compress;
471	break;
472	case 'd':
473	mode = uncompress;
474	break;
475	case 'f':
476	force = 1;
477	break;
478	case 'h':
479	usage (0);
480	break;
481	case 'v':
482	verbose = 1;
483	break;
484	case 'b':
485	errno = 0;
486	blocksize = strtoul (optarg, 0, 0);
487	if (errno \|\| !blocksize \|\| blocksize > MAX_BLOCKSIZE)
488	blocksize = BLOCKSIZE;
489	break;
490	default:
491	usage (1);
492	break;
493	}
494	}
495
496	if (optind == argc)
497	{ // stdin stdout
498	if (!force)
499	{
500	if ((mode == uncompress \|\| mode == lzcat) && isatty (0))
501	{
502	fprintf (stderr, "%s: compressed data not read from a terminal. Use -f to force decompression.\n", imagename);
503	exit (1);
504	}
505	if (mode == compress && isatty (1))
506	{
507	fprintf (stderr, "%s: compressed data not written to a terminal. Use -f to force compression.\n", imagename);
508	exit (1);
509	}
510	}
511
512	if (mode == compress)
513	rc = compress_fd (0, 1);
514	else
515	rc = uncompress_fd (0, 1);
516
517	exit (rc ? 1 : 0);
518	}
519
520	while (optind < argc)
521	rc \|= run_file (argv[optind++]);
522
523	exit (rc ? 1 : 0);
524	}
525