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 *
#	User	Rev	Content
1	root	1.1	/*
2	root	1.10	* Copyright (c) 2006 Stefan Traby <stefan@hello-penguin.com>
3	root	1.1	*
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	pcg	1.4	*
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	root	1.10	* of this file under either the BSD or the GPL License.
34	root	1.1	*/
35
36			#include "config.h"
37			#include <stdio.h>
38	root	1.10	#include <string.h>
39	root	1.1	#include <stdlib.h>
40	root	1.10	#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	root	1.1
48	root	1.10	#ifdef HAVE_GETOPT_H
49			# include <getopt.h>
50			#endif
51	root	1.1
52	root	1.10	#define BLOCKSIZE (1024 * 64 - 1)
53			#define MAX_BLOCKSIZE BLOCKSIZE
54	root	1.1
55	pcg	1.3	typedef unsigned char u8;
56
57	root	1.10	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	root	1.1	static void
98	root	1.10	usage (int rc)
99	root	1.1	{
100			fprintf (stderr, "\n"
101	root	1.10	"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	pcg	1.3	"http://liblzf.plan9.de/\n"
104	root	1.1	"\n"
105	root	1.10	"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	root	1.1
156	root	1.10	nr_written += len;
157			return 0;
158	root	1.1	}
159
160			/*
161			* Anatomy: an lzf file consists of any number of blocks in the following format:
162			*
163	root	1.8	* \x00 EOF (optional)
164	root	1.1	* "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	root	1.10
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	root	1.1	{
178	root	1.10	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	root	1.1	}
216
217	root	1.10	static int
218			uncompress_fd (int from, int to)
219	root	1.1	{
220	root	1.10	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	root	1.11	#if defined(__MINGW32__)
324			_setmode(fd, _O_BINARY);
325			#endif
326	root	1.10	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	root	1.11	#if !defined(__MINGW32__)
380	root	1.10	rc = lstat (fname, &mystat);
381	root	1.11	#else
382			rc = stat (fname, &mystat);
383			#endif
384	root	1.10	fd = open (fname, O_RDONLY);
385	root	1.11	#if defined(__MINGW32__)
386			_setmode(fd, _O_BINARY);
387			#endif
388	root	1.10	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	root	1.11	#if !defined(__MINGW32__)
434	root	1.10	fchmod (fd2, mystat.st_mode);
435	root	1.11	#else
436			chmod (oname, mystat.st_mode);
437			#endif
438	root	1.10	close (fd);
439			close (fd2);
440
441			if (!rc)
442			unlink (fname);
443
444			return rc;
445	root	1.1	}
446
447			int
448			main (int argc, char *argv[])
449			{
450	root	1.10	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	root	1.1
534	root	1.10	exit (rc ? 1 : 0);
535	root	1.1	}
536	root	1.10