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Revision: 1.15
Committed: Mon Dec 10 20:21:28 2012 UTC (11 years, 7 months ago) by root
Content type: text/plain
Branch: MAIN
CVS Tags: HEAD
Changes since 1.14: +4 -4 lines
Log Message:
ws

File Contents

# Content
1 /*
2 * Copyright (c) 2006 Stefan Traby <stefan@hello-penguin.com>
3 * Copyright (c) 2012 Marc Lehmann <schmorp@schmorp.de>
4 *
5 * Redistribution and use in source and binary forms, with or without modifica-
6 * tion, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
16 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
17 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
18 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
19 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
21 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
23 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
24 * OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * Alternatively, the contents of this file may be used under the terms of
27 * the GNU General Public License ("GPL") version 2 or any later version,
28 * in which case the provisions of the GPL are applicable instead of
29 * the above. If you wish to allow the use of your version of this file
30 * only under the terms of the GPL and not to allow others to use your
31 * version of this file under the BSD license, indicate your decision
32 * by deleting the provisions above and replace them with the notice
33 * and other provisions required by the GPL. If you do not delete the
34 * provisions above, a recipient may use your version of this file under
35 * either the BSD or the GPL.
36 */
37
38 #include "config.h"
39 #include <stdio.h>
40 #include <string.h>
41 #include <stdlib.h>
42 #include <unistd.h>
43 #include <sys/types.h>
44 #include <sys/stat.h>
45 #include <fcntl.h>
46 #include <errno.h>
47 #include <limits.h>
48 #include "lzf.h"
49 #include "lzf_c_best.c"
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 best = 0;
66 static int force = 0;
67 static long blocksize = BLOCKSIZE;
68
69 #ifdef HAVE_GETOPT_LONG
70
71 struct option longopts[] = {
72 {"compress" , 0, 0, 'c'},
73 {"decompress", 0, 0, 'd'},
74 {"uncompress", 0, 0, 'd'},
75 {"best" , 0, 0, '9'},
76 {"force" , 0, 0, 'f'},
77 {"help" , 0, 0, 'h'},
78 {"verbose" , 0, 0, 'v'},
79 {"blocksize" , 1, 0, 'b'},
80 {0 , 0, 0, 0}
81 };
82
83 static const char *opt =
84 "-c --compress compress\n"
85 "-d --decompress decompress\n"
86 "-9 --best best compression\n"
87 "-f --force force overwrite of output file\n"
88 "-h --help give this help\n"
89 "-v --verbose verbose mode\n"
90 "-b # --blocksize # set blocksize\n"
91 "\n";
92
93 #else
94
95 static const char *opt =
96 "-c compress\n"
97 "-d decompress\n"
98 "-9 best compression\n"
99 "-f force overwrite of output file\n"
100 "-h give this help\n"
101 "-v verbose mode\n"
102 "-b # set blocksize\n"
103 "\n";
104
105 #endif
106
107 static void
108 usage (int rc)
109 {
110 fprintf (stderr, "\n"
111 "lzf, a very lightweight compression/decompression utility written by Stefan Traby.\n"
112 "uses liblzf written by Marc Lehmann <schmorp@schmorp.de> You can find more info at\n"
113 "http://liblzf.plan9.de/\n"
114 "\n"
115 "usage: lzf [-dufhvb9] [file ...]\n"
116 " unlzf [file ...]\n"
117 " lzcat [file ...]\n"
118 "\n%s",
119 opt);
120
121 exit (rc);
122 }
123
124 static inline ssize_t
125 rread (int fd, void *buf, size_t len)
126 {
127 ssize_t rc = 0, offset = 0;
128 char *p = buf;
129
130 while (len && (rc = read (fd, &p[offset], len)) > 0)
131 {
132 offset += rc;
133 len -= rc;
134 }
135
136 nr_read += offset;
137
138 if (rc < 0)
139 return rc;
140
141 return offset;
142 }
143
144 /* returns 0 if all written else -1 */
145 static inline ssize_t
146 wwrite (int fd, void *buf, size_t len)
147 {
148 ssize_t rc;
149 char *b = buf;
150 size_t l = len;
151
152 while (l)
153 {
154 rc = write (fd, b, l);
155 if (rc < 0)
156 {
157 fprintf (stderr, "%s: write error: ", imagename);
158 perror ("");
159 return -1;
160 }
161
162 l -= rc;
163 b += rc;
164 }
165
166 nr_written += len;
167 return 0;
168 }
169
170 /*
171 * Anatomy: an lzf file consists of any number of blocks in the following format:
172 *
173 * \x00 EOF (optional)
174 * "ZV\0" 2-byte-usize <uncompressed data>
175 * "ZV\1" 2-byte-csize 2-byte-usize <compressed data>
176 * "ZV\2" 4-byte-crc32-0xdebb20e3 (NYI)
177 */
178
179
180 #define TYPE0_HDR_SIZE 5
181 #define TYPE1_HDR_SIZE 7
182 #define MAX_HDR_SIZE 7
183 #define MIN_HDR_SIZE 5
184
185 static int
186 compress_fd (int from, int to)
187 {
188 ssize_t us, cs, len;
189 u8 buf1[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
190 u8 buf2[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
191 u8 *header;
192
193 nr_read = nr_written = 0;
194 while ((us = rread (from, &buf1[MAX_HDR_SIZE], blocksize)) > 0)
195 {
196 cs = (best ? lzf_compress_best : lzf_compress) (&buf1[MAX_HDR_SIZE], us, &buf2[MAX_HDR_SIZE], us > 4 ? us - 4 : us);
197 if (cs)
198 {
199 header = &buf2[MAX_HDR_SIZE - TYPE1_HDR_SIZE];
200 header[0] = 'Z';
201 header[1] = 'V';
202 header[2] = 1;
203 header[3] = cs >> 8;
204 header[4] = cs & 0xff;
205 header[5] = us >> 8;
206 header[6] = us & 0xff;
207 len = cs + TYPE1_HDR_SIZE;
208 }
209 else
210 { // write uncompressed
211 header = &buf1[MAX_HDR_SIZE - TYPE0_HDR_SIZE];
212 header[0] = 'Z';
213 header[1] = 'V';
214 header[2] = 0;
215 header[3] = us >> 8;
216 header[4] = us & 0xff;
217 len = us + TYPE0_HDR_SIZE;
218 }
219
220 if (wwrite (to, header, len) == -1)
221 return -1;
222 }
223
224 return 0;
225 }
226
227 static int
228 uncompress_fd (int from, int to)
229 {
230 u8 header[MAX_HDR_SIZE];
231 u8 buf1[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
232 u8 buf2[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
233 u8 *p;
234 int l, rd;
235 ssize_t rc, cs, us, bytes, over = 0;
236
237 nr_read = nr_written = 0;
238 while (1)
239 {
240 rc = rread (from, header + over, MAX_HDR_SIZE - over);
241 if (rc < 0)
242 {
243 fprintf (stderr, "%s: read error: ", imagename);
244 perror ("");
245 return -1;
246 }
247
248 rc += over;
249 over = 0;
250 if (!rc || header[0] == 0)
251 return 0;
252
253 if (rc < MIN_HDR_SIZE || header[0] != 'Z' || header[1] != 'V')
254 {
255 fprintf (stderr, "%s: invalid data stream - magic not found or short header\n", imagename);
256 return -1;
257 }
258
259 switch (header[2])
260 {
261 case 0:
262 cs = -1;
263 us = (header[3] << 8) | header[4];
264 p = &header[TYPE0_HDR_SIZE];
265 break;
266 case 1:
267 if (rc < TYPE1_HDR_SIZE)
268 {
269 goto short_read;
270 }
271 cs = (header[3] << 8) | header[4];
272 us = (header[5] << 8) | header[6];
273 p = &header[TYPE1_HDR_SIZE];
274 break;
275 default:
276 fprintf (stderr, "%s: unknown blocktype\n", imagename);
277 return -1;
278 }
279
280 bytes = cs == -1 ? us : cs;
281 l = &header[rc] - p;
282
283 if (l > 0)
284 memcpy (buf1, p, l);
285
286 if (l > bytes)
287 {
288 over = l - bytes;
289 memmove (header, &p[bytes], over);
290 }
291
292 p = &buf1[l];
293 rd = bytes - l;
294 if (rd > 0)
295 if ((rc = rread (from, p, rd)) != rd)
296 goto short_read;
297
298 if (cs == -1)
299 {
300 if (wwrite (to, buf1, us))
301 return -1;
302 }
303 else
304 {
305 if (lzf_decompress (buf1, cs, buf2, us) != us)
306 {
307 fprintf (stderr, "%s: decompress: invalid stream - data corrupted\n", imagename);
308 return -1;
309 }
310
311 if (wwrite (to, buf2, us))
312 return -1;
313 }
314 }
315
316 return 0;
317
318 short_read:
319 fprintf (stderr, "%s: short data\n", imagename);
320 return -1;
321 }
322
323 static int
324 open_out (const char *name)
325 {
326 int fd;
327 int m = O_EXCL;
328
329 if (force)
330 m = 0;
331
332 fd = open (name, O_CREAT | O_WRONLY | O_TRUNC | m, 600);
333 #if defined(__MINGW32__)
334 _setmode(fd, _O_BINARY);
335 #endif
336 return fd;
337 }
338
339 static int
340 compose_name (const char *fname, char *oname)
341 {
342 char *p;
343
344 if (mode == compress)
345 {
346 if (strlen (fname) > PATH_MAX - 4)
347 {
348 fprintf (stderr, "%s: %s.lzf: name too long", imagename, fname);
349 return -1;
350 }
351
352 strcpy (oname, fname);
353 strcat (oname, ".lzf");
354 }
355 else
356 {
357 if (strlen (fname) > PATH_MAX)
358 {
359 fprintf (stderr, "%s: %s: name too long\n", imagename, fname);
360 return -1;
361 }
362
363 strcpy (oname, fname);
364 p = &oname[strlen (oname)] - 4;
365 if (p < oname || strcmp (p, ".lzf"))
366 {
367 fprintf (stderr, "%s: %s: unknown suffix\n", imagename, fname);
368 return -1;
369 }
370
371 *p = 0;
372 }
373
374 return 0;
375 }
376
377 static int
378 run_file (const char *fname)
379 {
380 int fd, fd2;
381 int rc;
382 struct stat mystat;
383 char oname[PATH_MAX + 1];
384
385 if (mode != lzcat)
386 if (compose_name (fname, oname))
387 return -1;
388
389 #if !defined(__MINGW32__)
390 rc = lstat (fname, &mystat);
391 #else
392 rc = stat (fname, &mystat);
393 #endif
394 fd = open (fname, O_RDONLY);
395 #if defined(__MINGW32__)
396 _setmode(fd, _O_BINARY);
397 #endif
398 if (rc || fd == -1)
399 {
400 fprintf (stderr, "%s: %s: ", imagename, fname);
401 perror ("");
402 return -1;
403 }
404
405 if (!S_ISREG (mystat.st_mode))
406 {
407 fprintf (stderr, "%s: %s: not a regular file.\n", imagename, fname);
408 close (fd);
409 return -1;
410 }
411
412 if (mode == lzcat)
413 {
414 rc = uncompress_fd (fd, 1);
415 close (fd);
416 return rc;
417 }
418
419 fd2 = open_out (oname);
420 if (fd2 == -1)
421 {
422 fprintf (stderr, "%s: %s: ", imagename, oname);
423 perror ("");
424 close (fd);
425 return -1;
426 }
427
428 if (mode == compress)
429 {
430 rc = compress_fd (fd, fd2);
431 if (!rc && verbose)
432 fprintf (stderr, "%s: %5.1f%% -- replaced with %s\n",
433 fname, nr_read == 0 ? 0 : 100.0 - nr_written / ((double) nr_read / 100.0), oname);
434 }
435 else
436 {
437 rc = uncompress_fd (fd, fd2);
438 if (!rc && verbose)
439 fprintf (stderr, "%s: %5.1f%% -- replaced with %s\n",
440 fname, nr_written == 0 ? 0 : 100.0 - nr_read / ((double) nr_written / 100.0), oname);
441 }
442
443 #if !defined(__MINGW32__)
444 fchmod (fd2, mystat.st_mode);
445 #else
446 chmod (oname, mystat.st_mode);
447 #endif
448 close (fd);
449 close (fd2);
450
451 if (!rc)
452 unlink (fname);
453
454 return rc;
455 }
456
457 int
458 main (int argc, char *argv[])
459 {
460 char *p = argv[0];
461 int optc;
462 int rc = 0;
463
464 errno = 0;
465 p = getenv ("LZF_BLOCKSIZE");
466 if (p)
467 {
468 blocksize = strtoul (p, 0, 0);
469 if (errno || !blocksize || blocksize > MAX_BLOCKSIZE)
470 blocksize = BLOCKSIZE;
471 }
472
473 p = strrchr (argv[0], '/');
474 imagename = p ? ++p : argv[0];
475
476 if (!strncmp (imagename, "un", 2) || !strncmp (imagename, "de", 2))
477 mode = uncompress;
478
479 if (strstr (imagename, "cat"))
480 mode = lzcat;
481
482 #ifdef HAVE_GETOPT_LONG
483 while ((optc = getopt_long (argc, argv, "cd9fhvb:", longopts, 0)) != -1)
484 #else
485 while ((optc = getopt (argc, argv, "cd9fhvb:")) != -1)
486 #endif
487 {
488 switch (optc)
489 {
490 case 'c':
491 mode = compress;
492 break;
493 case 'd':
494 mode = uncompress;
495 break;
496 case '9':
497 best = 1;
498 break;
499 case 'f':
500 force = 1;
501 break;
502 case 'h':
503 usage (0);
504 break;
505 case 'v':
506 verbose = 1;
507 break;
508 case 'b':
509 errno = 0;
510 blocksize = strtoul (optarg, 0, 0);
511 if (errno || !blocksize || blocksize > MAX_BLOCKSIZE)
512 blocksize = BLOCKSIZE;
513 break;
514 default:
515 usage (1);
516 break;
517 }
518 }
519
520 if (optind == argc)
521 { // stdin stdout
522 if (!force)
523 {
524 if ((mode == uncompress || mode == lzcat) && isatty (0))
525 {
526 fprintf (stderr, "%s: compressed data not read from a terminal. Use -f to force decompression.\n", imagename);
527 exit (1);
528 }
529 if (mode == compress && isatty (1))
530 {
531 fprintf (stderr, "%s: compressed data not written to a terminal. Use -f to force compression.\n", imagename);
532 exit (1);
533 }
534 }
535
536 if (mode == compress)
537 rc = compress_fd (0, 1);
538 else
539 rc = uncompress_fd (0, 1);
540
541 exit (rc ? 1 : 0);
542 }
543
544 while (optind < argc)
545 rc |= run_file (argv[optind++]);
546
547 exit (rc ? 1 : 0);
548 }
549