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 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);
#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:	1.12
Committed:	Fri Nov 2 12:39:20 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-2_1
Changes since 1.11:	+0 -3 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 version 2 (the "GPL"), in which case the
27	* provisions of the GPL are applicable instead of the above. If you wish to
28	* allow the use of your version of this file only under the terms of the
29	* GPL and not to allow others to use your version of this file under the
30	* BSD license, indicate your decision by deleting the provisions above and
31	* replace them with the notice and other provisions required by the GPL. If
32	* you do not delete the provisions above, a recipient may use your version
33	* of this file under either the BSD or the GPL License.
34	*/
35
36	#include "config.h"
37	#include <stdio.h>
38	#include <string.h>
39	#include <stdlib.h>
40	#include <unistd.h>
41	#include <sys/types.h>
42	#include <sys/stat.h>
43	#include <fcntl.h>
44	#include <errno.h>
45	#include <limits.h>
46	#include "lzf.h"
47
48	#ifdef HAVE_GETOPT_H
49	# include <getopt.h>
50	#endif
51
52	#define BLOCKSIZE (1024 * 64 - 1)
53	#define MAX_BLOCKSIZE BLOCKSIZE
54
55	typedef unsigned char u8;
56
57	static off_t nr_read, nr_written;
58
59	static const char *imagename;
60	static enum { compress, uncompress, lzcat } mode = compress;
61	static int verbose = 0;
62	static int force = 0;
63	static long blocksize = BLOCKSIZE;
64
65	#ifdef HAVE_GETOPT_LONG
66
67	struct option longopts[] = {
68	{"compress", 0, 0, 'c'},
69	{"decompress", 0, 0, 'd'},
70	{"uncompress", 0, 0, 'd'},
71	{"force", 0, 0, 'f'},
72	{"help", 0, 0, 'h'},
73	{"verbose", 0, 0, 'v'},
74	{"blocksize", 1, 0, 'b'},
75	{0, 0, 0, 0}
76	};
77
78	static const char *opt =
79	"-c --compress compress\n"
80	"-d --decompress decompress\n"
81	"-f --force force overwrite of output file\n"
82	"-h --help give this help\n" "-v --verbose verbose mode\n" "-b # --blocksize # set blocksize\n" "\n";
83
84	#else
85
86	static const char *opt =
87	"-c compress\n"
88	"-d decompress\n"
89	"-f force overwrite of output file\n"
90	"-h give this help\n"
91	"-v verbose mode\n"
92	"-b # set blocksize\n"
93	"\n";
94
95	#endif
96
97	static void
98	usage (int rc)
99	{
100	fprintf (stderr, "\n"
101	"lzf, a very lightweight compression/decompression utility written by Stefan Traby.\n"
102	"uses liblzf written by Marc Lehmann <schmorp@schmorp.de> You can find more info at\n"
103	"http://liblzf.plan9.de/\n"
104	"\n"
105	"usage: lzf [-dufhvb] [file ...]\n"
106	" unlzf [file ...]\n"
107	" lzcat [file ...]\n"
108	"\n%s",
109	opt);
110
111	exit (rc);
112	}
113
114	static inline ssize_t
115	rread (int fd, void *buf, size_t len)
116	{
117	ssize_t rc = 0, offset = 0;
118	char *p = buf;
119
120	while (len && (rc = read (fd, &p[offset], len)) > 0)
121	{
122	offset += rc;
123	len -= rc;
124	}
125
126	nr_read += offset;
127
128	if (rc < 0)
129	return rc;
130
131	return offset;
132	}
133
134	/* returns 0 if all written else -1 */
135	static inline ssize_t
136	wwrite (int fd, void *buf, size_t len)
137	{
138	ssize_t rc;
139	char *b = buf;
140	size_t l = len;
141
142	while (l)
143	{
144	rc = write (fd, b, l);
145	if (rc < 0)
146	{
147	fprintf (stderr, "%s: write error: ", imagename);
148	perror ("");
149	return -1;
150	}
151
152	l -= rc;
153	b += rc;
154	}
155
156	nr_written += len;
157	return 0;
158	}
159
160	/*
161	* Anatomy: an lzf file consists of any number of blocks in the following format:
162	*
163	* \x00 EOF (optional)
164	* "ZV\0" 2-byte-usize <uncompressed data>
165	* "ZV\1" 2-byte-csize 2-byte-usize <compressed data>
166	* "ZV\2" 4-byte-crc32-0xdebb20e3 (NYI)
167	*/
168
169
170	#define TYPE0_HDR_SIZE 5
171	#define TYPE1_HDR_SIZE 7
172	#define MAX_HDR_SIZE 7
173	#define MIN_HDR_SIZE 5
174
175	static int
176	compress_fd (int from, int to)
177	{
178	ssize_t us, cs, len;
179	u8 buf1[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
180	u8 buf2[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
181	u8 *header;
182
183	nr_read = nr_written = 0;
184	while ((us = rread (from, &buf1[MAX_HDR_SIZE], blocksize)) > 0)
185	{
186	cs = lzf_compress (&buf1[MAX_HDR_SIZE], us, &buf2[MAX_HDR_SIZE], us > 4 ? us - 4 : us);
187	if (cs)
188	{
189	header = &buf2[MAX_HDR_SIZE - TYPE1_HDR_SIZE];
190	header[0] = 'Z';
191	header[1] = 'V';
192	header[2] = 1;
193	header[3] = cs >> 8;
194	header[4] = cs & 0xff;
195	header[5] = us >> 8;
196	header[6] = us & 0xff;
197	len = cs + TYPE1_HDR_SIZE;
198	}
199	else
200	{ // write uncompressed
201	header = &buf1[MAX_HDR_SIZE - TYPE0_HDR_SIZE];
202	header[0] = 'Z';
203	header[1] = 'V';
204	header[2] = 0;
205	header[3] = us >> 8;
206	header[4] = us & 0xff;
207	len = us + TYPE0_HDR_SIZE;
208	}
209
210	if (wwrite (to, header, len) == -1)
211	return -1;
212	}
213
214	return 0;
215	}
216
217	static int
218	uncompress_fd (int from, int to)
219	{
220	u8 header[MAX_HDR_SIZE];
221	u8 buf1[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
222	u8 buf2[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
223	u8 *p;
224	int l, rd;
225	ssize_t rc, cs, us, bytes, over = 0;
226
227	nr_read = nr_written = 0;
228	while (1)
229	{
230	rc = rread (from, header + over, MAX_HDR_SIZE - over);
231	if (rc < 0)
232	{
233	fprintf (stderr, "%s: read error: ", imagename);
234	perror ("");
235	return -1;
236	}
237
238	rc += over;
239	over = 0;
240	if (!rc \|\| header[0] == 0)
241	return 0;
242
243	if (rc < MIN_HDR_SIZE \|\| header[0] != 'Z' \|\| header[1] != 'V')
244	{
245	fprintf (stderr, "%s: invalid data stream - magic not found or short header\n", imagename);
246	return -1;
247	}
248
249	switch (header[2])
250	{
251	case 0:
252	cs = -1;
253	us = (header[3] << 8) \| header[4];
254	p = &header[TYPE0_HDR_SIZE];
255	break;
256	case 1:
257	if (rc < TYPE1_HDR_SIZE)
258	{
259	goto short_read;
260	}
261	cs = (header[3] << 8) \| header[4];
262	us = (header[5] << 8) \| header[6];
263	p = &header[TYPE1_HDR_SIZE];
264	break;
265	default:
266	fprintf (stderr, "%s: unknown blocktype\n", imagename);
267	return -1;
268	}
269
270	bytes = cs == -1 ? us : cs;
271	l = &header[rc] - p;
272
273	if (l > 0)
274	memcpy (buf1, p, l);
275
276	if (l > bytes)
277	{
278	over = l - bytes;
279	memmove (header, &p[bytes], over);
280	}
281
282	p = &buf1[l];
283	rd = bytes - l;
284	if (rd > 0)
285	if ((rc = rread (from, p, rd)) != rd)
286	goto short_read;
287
288	if (cs == -1)
289	{
290	if (wwrite (to, buf1, us))
291	return -1;
292	}
293	else
294	{
295	if (lzf_decompress (buf1, cs, buf2, us) != us)
296	{
297	fprintf (stderr, "%s: decompress: invalid stream - data corrupted\n", imagename);
298	return -1;
299	}
300
301	if (wwrite (to, buf2, us))
302	return -1;
303	}
304	}
305
306	return 0;
307
308	short_read:
309	fprintf (stderr, "%s: short data\n", imagename);
310	return -1;
311	}
312
313	static int
314	open_out (const char *name)
315	{
316	int fd;
317	int m = O_EXCL;
318
319	if (force)
320	m = 0;
321
322	fd = open (name, O_CREAT \| O_WRONLY \| O_TRUNC \| m, 600);
323	#if defined(__MINGW32__)
324	_setmode(fd, _O_BINARY);
325	#endif
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	#if !defined(__MINGW32__)
380	rc = lstat (fname, &mystat);
381	#else
382	rc = stat (fname, &mystat);
383	#endif
384	fd = open (fname, O_RDONLY);
385	#if defined(__MINGW32__)
386	_setmode(fd, _O_BINARY);
387	#endif
388	if (rc \|\| fd == -1)
389	{
390	fprintf (stderr, "%s: %s: ", imagename, fname);
391	perror ("");
392	return -1;
393	}
394
395	if (!S_ISREG (mystat.st_mode))
396	{
397	fprintf (stderr, "%s: %s: not a regular file.\n", imagename, fname);
398	close (fd);
399	return -1;
400	}
401
402	if (mode == lzcat)
403	{
404	rc = uncompress_fd (fd, 1);
405	close (fd);
406	return rc;
407	}
408
409	fd2 = open_out (oname);
410	if (fd2 == -1)
411	{
412	fprintf (stderr, "%s: %s: ", imagename, oname);
413	perror ("");
414	close (fd);
415	return -1;
416	}
417
418	if (mode == compress)
419	{
420	rc = compress_fd (fd, fd2);
421	if (!rc && verbose)
422	fprintf (stderr, "%s: %5.1f%% -- replaced with %s\n",
423	fname, nr_read == 0 ? 0 : 100.0 - nr_written / ((double) nr_read / 100.0), oname);
424	}
425	else
426	{
427	rc = uncompress_fd (fd, fd2);
428	if (!rc && verbose)
429	fprintf (stderr, "%s: %5.1f%% -- replaced with %s\n",
430	fname, nr_written == 0 ? 0 : 100.0 - nr_read / ((double) nr_written / 100.0), oname);
431	}
432
433	#if !defined(__MINGW32__)
434	fchmod (fd2, mystat.st_mode);
435	#else
436	chmod (oname, mystat.st_mode);
437	#endif
438	close (fd);
439	close (fd2);
440
441	if (!rc)
442	unlink (fname);
443
444	return rc;
445	}
446
447	int
448	main (int argc, char *argv[])
449	{
450	char *p = argv[0];
451	int optc;
452	int rc = 0;
453
454	errno = 0;
455	p = getenv ("LZF_BLOCKSIZE");
456	if (p)
457	{
458	blocksize = strtoul (p, 0, 0);
459	if (errno \|\| !blocksize \|\| blocksize > MAX_BLOCKSIZE)
460	blocksize = BLOCKSIZE;
461	}
462
463	p = strrchr (argv[0], '/');
464	imagename = p ? ++p : argv[0];
465
466	if (!strncmp (imagename, "un", 2) \|\| !strncmp (imagename, "de", 2))
467	mode = uncompress;
468
469	if (strstr (imagename, "cat"))
470	mode = lzcat;
471
472	#ifdef HAVE_GETOPT_LONG
473	while ((optc = getopt_long (argc, argv, "cdfhvb:", longopts, 0)) != -1)
474	#else
475	while ((optc = getopt (argc, argv, "cdfhvb:")) != -1)
476	#endif
477	{
478	switch (optc)
479	{
480	case 'c':
481	mode = compress;
482	break;
483	case 'd':
484	mode = uncompress;
485	break;
486	case 'f':
487	force = 1;
488	break;
489	case 'h':
490	usage (0);
491	break;
492	case 'v':
493	verbose = 1;
494	break;
495	case 'b':
496	errno = 0;
497	blocksize = strtoul (optarg, 0, 0);
498	if (errno \|\| !blocksize \|\| blocksize > MAX_BLOCKSIZE)
499	blocksize = BLOCKSIZE;
500	break;
501	default:
502	usage (1);
503	break;
504	}
505	}
506
507	if (optind == argc)
508	{ // stdin stdout
509	if (!force)
510	{
511	if ((mode == uncompress \|\| mode == lzcat) && isatty (0))
512	{
513	fprintf (stderr, "%s: compressed data not read from a terminal. Use -f to force decompression.\n", imagename);
514	exit (1);
515	}
516	if (mode == compress && isatty (1))
517	{
518	fprintf (stderr, "%s: compressed data not written to a terminal. Use -f to force compression.\n", imagename);
519	exit (1);
520	}
521	}
522
523	if (mode == compress)
524	rc = compress_fd (0, 1);
525	else
526	rc = uncompress_fd (0, 1);
527
528	exit (rc ? 1 : 0);
529	}
530
531	while (optind < argc)
532	rc \|= run_file (argv[optind++]);
533
534	exit (rc ? 1 : 0);
535	}
536