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 *
#	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	root	1.13	* 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	root	1.1	*/
36
37			#include "config.h"
38			#include <stdio.h>
39	root	1.10	#include <string.h>
40	root	1.1	#include <stdlib.h>
41	root	1.10	#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	root	1.1
49	root	1.10	#ifdef HAVE_GETOPT_H
50			# include <getopt.h>
51			#endif
52	root	1.1
53	root	1.10	#define BLOCKSIZE (1024 * 64 - 1)
54			#define MAX_BLOCKSIZE BLOCKSIZE
55	root	1.1
56	pcg	1.3	typedef unsigned char u8;
57
58	root	1.10	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	root	1.1	static void
99	root	1.10	usage (int rc)
100	root	1.1	{
101			fprintf (stderr, "\n"
102	root	1.10	"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	pcg	1.3	"http://liblzf.plan9.de/\n"
105	root	1.1	"\n"
106	root	1.10	"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	root	1.1
157	root	1.10	nr_written += len;
158			return 0;
159	root	1.1	}
160
161			/*
162			* Anatomy: an lzf file consists of any number of blocks in the following format:
163			*
164	root	1.8	* \x00 EOF (optional)
165	root	1.1	* "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	root	1.10
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	root	1.1	{
179	root	1.10	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	root	1.1	}
217
218	root	1.10	static int
219			uncompress_fd (int from, int to)
220	root	1.1	{
221	root	1.10	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	root	1.11	#if defined(__MINGW32__)
325			_setmode(fd, _O_BINARY);
326			#endif
327	root	1.10	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	root	1.11	#if !defined(__MINGW32__)
381	root	1.10	rc = lstat (fname, &mystat);
382	root	1.11	#else
383			rc = stat (fname, &mystat);
384			#endif
385	root	1.10	fd = open (fname, O_RDONLY);
386	root	1.11	#if defined(__MINGW32__)
387			_setmode(fd, _O_BINARY);
388			#endif
389	root	1.10	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	root	1.11	#if !defined(__MINGW32__)
435	root	1.10	fchmod (fd2, mystat.st_mode);
436	root	1.11	#else
437			chmod (oname, mystat.st_mode);
438			#endif
439	root	1.10	close (fd);
440			close (fd2);
441
442			if (!rc)
443			unlink (fname);
444
445			return rc;
446	root	1.1	}
447
448			int
449			main (int argc, char *argv[])
450			{
451	root	1.10	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	root	1.1
535	root	1.10	exit (rc ? 1 : 0);
536	root	1.1	}
537	root	1.10