1 /*
2 * jpegtran.c
3 *
4 * This file was part of the Independent JPEG Group's software:
5 * Copyright (C) 1995-2010, Thomas G. Lane, Guido Vollbeding.
6 * libjpeg-turbo Modifications:
7 * Copyright (C) 2010, 2014, D. R. Commander.
8 * For conditions of distribution and use, see the accompanying README.ijg
9 * file.
10 *
11 * This file contains a command-line user interface for JPEG transcoding.
12 * It is very similar to cjpeg.c, and partly to djpeg.c, but provides
13 * lossless transcoding between different JPEG file formats. It also
14 * provides some lossless and sort-of-lossless transformations of JPEG data.
15 */
16
17 #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
18 #include "transupp.h" /* Support routines for jpegtran */
19 #include "jversion.h" /* for version message */
20 #include "jconfigint.h"
21
22 #ifdef USE_CCOMMAND /* command-line reader for Macintosh */
23 #ifdef __MWERKS__
24 #include <SIOUX.h> /* Metrowerks needs this */
25 #include <console.h> /* ... and this */
26 #endif
27 #ifdef THINK_C
28 #include <console.h> /* Think declares it here */
29 #endif
30 #endif
31
32
33 /*
34 * Argument-parsing code.
35 * The switch parser is designed to be useful with DOS-style command line
36 * syntax, ie, intermixed switches and file names, where only the switches
37 * to the left of a given file name affect processing of that file.
38 * The main program in this file doesn't actually use this capability...
39 */
40
41
42 static const char *progname; /* program name for error messages */
43 static char *outfilename; /* for -outfile switch */
44 static JCOPY_OPTION copyoption; /* -copy switch */
45 static jpeg_transform_info transformoption; /* image transformation options */
46
47
48 LOCAL(void)
usage(void)49 usage (void)
50 /* complain about bad command line */
51 {
52 fprintf(stderr, "usage: %s [switches] ", progname);
53 #ifdef TWO_FILE_COMMANDLINE
54 fprintf(stderr, "inputfile outputfile\n");
55 #else
56 fprintf(stderr, "[inputfile]\n");
57 #endif
58
59 fprintf(stderr, "Switches (names may be abbreviated):\n");
60 fprintf(stderr, " -copy none Copy no extra markers from source file\n");
61 fprintf(stderr, " -copy comments Copy only comment markers (default)\n");
62 fprintf(stderr, " -copy all Copy all extra markers\n");
63 #ifdef ENTROPY_OPT_SUPPORTED
64 fprintf(stderr, " -optimize Optimize Huffman table (smaller file, but slow compression)\n");
65 #endif
66 #ifdef C_PROGRESSIVE_SUPPORTED
67 fprintf(stderr, " -progressive Create progressive JPEG file\n");
68 #endif
69 fprintf(stderr, "Switches for modifying the image:\n");
70 #if TRANSFORMS_SUPPORTED
71 fprintf(stderr, " -crop WxH+X+Y Crop to a rectangular subarea\n");
72 fprintf(stderr, " -grayscale Reduce to grayscale (omit color data)\n");
73 fprintf(stderr, " -flip [horizontal|vertical] Mirror image (left-right or top-bottom)\n");
74 fprintf(stderr, " -perfect Fail if there is non-transformable edge blocks\n");
75 fprintf(stderr, " -rotate [90|180|270] Rotate image (degrees clockwise)\n");
76 #endif
77 #if TRANSFORMS_SUPPORTED
78 fprintf(stderr, " -transpose Transpose image\n");
79 fprintf(stderr, " -transverse Transverse transpose image\n");
80 fprintf(stderr, " -trim Drop non-transformable edge blocks\n");
81 #endif
82 fprintf(stderr, "Switches for advanced users:\n");
83 #ifdef C_ARITH_CODING_SUPPORTED
84 fprintf(stderr, " -arithmetic Use arithmetic coding\n");
85 #endif
86 fprintf(stderr, " -restart N Set restart interval in rows, or in blocks with B\n");
87 fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n");
88 fprintf(stderr, " -outfile name Specify name for output file\n");
89 fprintf(stderr, " -verbose or -debug Emit debug output\n");
90 fprintf(stderr, " -version Print version information and exit\n");
91 fprintf(stderr, "Switches for wizards:\n");
92 #ifdef C_MULTISCAN_FILES_SUPPORTED
93 fprintf(stderr, " -scans file Create multi-scan JPEG per script file\n");
94 #endif
95 exit(EXIT_FAILURE);
96 }
97
98
99 LOCAL(void)
select_transform(JXFORM_CODE transform)100 select_transform (JXFORM_CODE transform)
101 /* Silly little routine to detect multiple transform options,
102 * which we can't handle.
103 */
104 {
105 #if TRANSFORMS_SUPPORTED
106 if (transformoption.transform == JXFORM_NONE ||
107 transformoption.transform == transform) {
108 transformoption.transform = transform;
109 } else {
110 fprintf(stderr, "%s: can only do one image transformation at a time\n",
111 progname);
112 usage();
113 }
114 #else
115 fprintf(stderr, "%s: sorry, image transformation was not compiled\n",
116 progname);
117 exit(EXIT_FAILURE);
118 #endif
119 }
120
121
122 LOCAL(int)
parse_switches(j_compress_ptr cinfo,int argc,char ** argv,int last_file_arg_seen,boolean for_real)123 parse_switches (j_compress_ptr cinfo, int argc, char **argv,
124 int last_file_arg_seen, boolean for_real)
125 /* Parse optional switches.
126 * Returns argv[] index of first file-name argument (== argc if none).
127 * Any file names with indexes <= last_file_arg_seen are ignored;
128 * they have presumably been processed in a previous iteration.
129 * (Pass 0 for last_file_arg_seen on the first or only iteration.)
130 * for_real is FALSE on the first (dummy) pass; we may skip any expensive
131 * processing.
132 */
133 {
134 int argn;
135 char *arg;
136 boolean simple_progressive;
137 char *scansarg = NULL; /* saves -scans parm if any */
138
139 /* Set up default JPEG parameters. */
140 simple_progressive = FALSE;
141 outfilename = NULL;
142 copyoption = JCOPYOPT_DEFAULT;
143 transformoption.transform = JXFORM_NONE;
144 transformoption.perfect = FALSE;
145 transformoption.trim = FALSE;
146 transformoption.force_grayscale = FALSE;
147 transformoption.crop = FALSE;
148 transformoption.slow_hflip = FALSE;
149 cinfo->err->trace_level = 0;
150
151 /* Scan command line options, adjust parameters */
152
153 for (argn = 1; argn < argc; argn++) {
154 arg = argv[argn];
155 if (*arg != '-') {
156 /* Not a switch, must be a file name argument */
157 if (argn <= last_file_arg_seen) {
158 outfilename = NULL; /* -outfile applies to just one input file */
159 continue; /* ignore this name if previously processed */
160 }
161 break; /* else done parsing switches */
162 }
163 arg++; /* advance past switch marker character */
164
165 if (keymatch(arg, "arithmetic", 1)) {
166 /* Use arithmetic coding. */
167 #ifdef C_ARITH_CODING_SUPPORTED
168 cinfo->arith_code = TRUE;
169 #else
170 fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",
171 progname);
172 exit(EXIT_FAILURE);
173 #endif
174
175 } else if (keymatch(arg, "copy", 2)) {
176 /* Select which extra markers to copy. */
177 if (++argn >= argc) /* advance to next argument */
178 usage();
179 if (keymatch(argv[argn], "none", 1)) {
180 copyoption = JCOPYOPT_NONE;
181 } else if (keymatch(argv[argn], "comments", 1)) {
182 copyoption = JCOPYOPT_COMMENTS;
183 } else if (keymatch(argv[argn], "all", 1)) {
184 copyoption = JCOPYOPT_ALL;
185 } else
186 usage();
187
188 } else if (keymatch(arg, "crop", 2)) {
189 /* Perform lossless cropping. */
190 #if TRANSFORMS_SUPPORTED
191 if (++argn >= argc) /* advance to next argument */
192 usage();
193 if (! jtransform_parse_crop_spec(&transformoption, argv[argn])) {
194 fprintf(stderr, "%s: bogus -crop argument '%s'\n",
195 progname, argv[argn]);
196 exit(EXIT_FAILURE);
197 }
198 #else
199 select_transform(JXFORM_NONE); /* force an error */
200 #endif
201
202 } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
203 /* Enable debug printouts. */
204 /* On first -d, print version identification */
205 static boolean printed_version = FALSE;
206
207 if (! printed_version) {
208 fprintf(stderr, "%s version %s (build %s)\n",
209 PACKAGE_NAME, VERSION, BUILD);
210 fprintf(stderr, "%s\n\n", JCOPYRIGHT);
211 fprintf(stderr, "Emulating The Independent JPEG Group's software, version %s\n\n",
212 JVERSION);
213 printed_version = TRUE;
214 }
215 cinfo->err->trace_level++;
216
217 } else if (keymatch(arg, "version", 4)) {
218 fprintf(stderr, "%s version %s (build %s)\n",
219 PACKAGE_NAME, VERSION, BUILD);
220 exit(EXIT_SUCCESS);
221
222 } else if (keymatch(arg, "flip", 1)) {
223 /* Mirror left-right or top-bottom. */
224 if (++argn >= argc) /* advance to next argument */
225 usage();
226 if (keymatch(argv[argn], "horizontal", 1))
227 select_transform(JXFORM_FLIP_H);
228 else if (keymatch(argv[argn], "vertical", 1))
229 select_transform(JXFORM_FLIP_V);
230 else
231 usage();
232
233 } else if (keymatch(arg, "grayscale", 1) || keymatch(arg, "greyscale",1)) {
234 /* Force to grayscale. */
235 #if TRANSFORMS_SUPPORTED
236 transformoption.force_grayscale = TRUE;
237 #else
238 select_transform(JXFORM_NONE); /* force an error */
239 #endif
240
241 } else if (keymatch(arg, "maxmemory", 3)) {
242 /* Maximum memory in Kb (or Mb with 'm'). */
243 long lval;
244 char ch = 'x';
245
246 if (++argn >= argc) /* advance to next argument */
247 usage();
248 if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
249 usage();
250 if (ch == 'm' || ch == 'M')
251 lval *= 1000L;
252 cinfo->mem->max_memory_to_use = lval * 1000L;
253
254 } else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) {
255 /* Enable entropy parm optimization. */
256 #ifdef ENTROPY_OPT_SUPPORTED
257 cinfo->optimize_coding = TRUE;
258 #else
259 fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n",
260 progname);
261 exit(EXIT_FAILURE);
262 #endif
263
264 } else if (keymatch(arg, "outfile", 4)) {
265 /* Set output file name. */
266 if (++argn >= argc) /* advance to next argument */
267 usage();
268 outfilename = argv[argn]; /* save it away for later use */
269
270 } else if (keymatch(arg, "perfect", 2)) {
271 /* Fail if there is any partial edge MCUs that the transform can't
272 * handle. */
273 transformoption.perfect = TRUE;
274
275 } else if (keymatch(arg, "progressive", 2)) {
276 /* Select simple progressive mode. */
277 #ifdef C_PROGRESSIVE_SUPPORTED
278 simple_progressive = TRUE;
279 /* We must postpone execution until num_components is known. */
280 #else
281 fprintf(stderr, "%s: sorry, progressive output was not compiled\n",
282 progname);
283 exit(EXIT_FAILURE);
284 #endif
285
286 } else if (keymatch(arg, "restart", 1)) {
287 /* Restart interval in MCU rows (or in MCUs with 'b'). */
288 long lval;
289 char ch = 'x';
290
291 if (++argn >= argc) /* advance to next argument */
292 usage();
293 if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
294 usage();
295 if (lval < 0 || lval > 65535L)
296 usage();
297 if (ch == 'b' || ch == 'B') {
298 cinfo->restart_interval = (unsigned int) lval;
299 cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */
300 } else {
301 cinfo->restart_in_rows = (int) lval;
302 /* restart_interval will be computed during startup */
303 }
304
305 } else if (keymatch(arg, "rotate", 2)) {
306 /* Rotate 90, 180, or 270 degrees (measured clockwise). */
307 if (++argn >= argc) /* advance to next argument */
308 usage();
309 if (keymatch(argv[argn], "90", 2))
310 select_transform(JXFORM_ROT_90);
311 else if (keymatch(argv[argn], "180", 3))
312 select_transform(JXFORM_ROT_180);
313 else if (keymatch(argv[argn], "270", 3))
314 select_transform(JXFORM_ROT_270);
315 else
316 usage();
317
318 } else if (keymatch(arg, "scans", 1)) {
319 /* Set scan script. */
320 #ifdef C_MULTISCAN_FILES_SUPPORTED
321 if (++argn >= argc) /* advance to next argument */
322 usage();
323 scansarg = argv[argn];
324 /* We must postpone reading the file in case -progressive appears. */
325 #else
326 fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n",
327 progname);
328 exit(EXIT_FAILURE);
329 #endif
330
331 } else if (keymatch(arg, "transpose", 1)) {
332 /* Transpose (across UL-to-LR axis). */
333 select_transform(JXFORM_TRANSPOSE);
334
335 } else if (keymatch(arg, "transverse", 6)) {
336 /* Transverse transpose (across UR-to-LL axis). */
337 select_transform(JXFORM_TRANSVERSE);
338
339 } else if (keymatch(arg, "trim", 3)) {
340 /* Trim off any partial edge MCUs that the transform can't handle. */
341 transformoption.trim = TRUE;
342
343 } else {
344 usage(); /* bogus switch */
345 }
346 }
347
348 /* Post-switch-scanning cleanup */
349
350 if (for_real) {
351
352 #ifdef C_PROGRESSIVE_SUPPORTED
353 if (simple_progressive) /* process -progressive; -scans can override */
354 jpeg_simple_progression(cinfo);
355 #endif
356
357 #ifdef C_MULTISCAN_FILES_SUPPORTED
358 if (scansarg != NULL) /* process -scans if it was present */
359 if (! read_scan_script(cinfo, scansarg))
360 usage();
361 #endif
362 }
363
364 return argn; /* return index of next arg (file name) */
365 }
366
367
368 /*
369 * The main program.
370 */
371
372 int
main(int argc,char ** argv)373 main (int argc, char **argv)
374 {
375 struct jpeg_decompress_struct srcinfo;
376 struct jpeg_compress_struct dstinfo;
377 struct jpeg_error_mgr jsrcerr, jdsterr;
378 #ifdef PROGRESS_REPORT
379 struct cdjpeg_progress_mgr progress;
380 #endif
381 jvirt_barray_ptr *src_coef_arrays;
382 jvirt_barray_ptr *dst_coef_arrays;
383 int file_index;
384 /* We assume all-in-memory processing and can therefore use only a
385 * single file pointer for sequential input and output operation.
386 */
387 FILE *fp;
388
389 /* On Mac, fetch a command line. */
390 #ifdef USE_CCOMMAND
391 argc = ccommand(&argv);
392 #endif
393
394 progname = argv[0];
395 if (progname == NULL || progname[0] == 0)
396 progname = "jpegtran"; /* in case C library doesn't provide it */
397
398 /* Initialize the JPEG decompression object with default error handling. */
399 srcinfo.err = jpeg_std_error(&jsrcerr);
400 jpeg_create_decompress(&srcinfo);
401 /* Initialize the JPEG compression object with default error handling. */
402 dstinfo.err = jpeg_std_error(&jdsterr);
403 jpeg_create_compress(&dstinfo);
404
405 /* Scan command line to find file names.
406 * It is convenient to use just one switch-parsing routine, but the switch
407 * values read here are mostly ignored; we will rescan the switches after
408 * opening the input file. Also note that most of the switches affect the
409 * destination JPEG object, so we parse into that and then copy over what
410 * needs to affects the source too.
411 */
412
413 file_index = parse_switches(&dstinfo, argc, argv, 0, FALSE);
414 jsrcerr.trace_level = jdsterr.trace_level;
415 srcinfo.mem->max_memory_to_use = dstinfo.mem->max_memory_to_use;
416
417 #ifdef TWO_FILE_COMMANDLINE
418 /* Must have either -outfile switch or explicit output file name */
419 if (outfilename == NULL) {
420 if (file_index != argc-2) {
421 fprintf(stderr, "%s: must name one input and one output file\n",
422 progname);
423 usage();
424 }
425 outfilename = argv[file_index+1];
426 } else {
427 if (file_index != argc-1) {
428 fprintf(stderr, "%s: must name one input and one output file\n",
429 progname);
430 usage();
431 }
432 }
433 #else
434 /* Unix style: expect zero or one file name */
435 if (file_index < argc-1) {
436 fprintf(stderr, "%s: only one input file\n", progname);
437 usage();
438 }
439 #endif /* TWO_FILE_COMMANDLINE */
440
441 /* Open the input file. */
442 if (file_index < argc) {
443 if ((fp = fopen(argv[file_index], READ_BINARY)) == NULL) {
444 fprintf(stderr, "%s: can't open %s for reading\n", progname, argv[file_index]);
445 exit(EXIT_FAILURE);
446 }
447 } else {
448 /* default input file is stdin */
449 fp = read_stdin();
450 }
451
452 #ifdef PROGRESS_REPORT
453 start_progress_monitor((j_common_ptr) &dstinfo, &progress);
454 #endif
455
456 /* Specify data source for decompression */
457 jpeg_stdio_src(&srcinfo, fp);
458
459 /* Enable saving of extra markers that we want to copy */
460 jcopy_markers_setup(&srcinfo, copyoption);
461
462 /* Read file header */
463 (void) jpeg_read_header(&srcinfo, TRUE);
464
465 /* Any space needed by a transform option must be requested before
466 * jpeg_read_coefficients so that memory allocation will be done right.
467 */
468 #if TRANSFORMS_SUPPORTED
469 /* Fail right away if -perfect is given and transformation is not perfect.
470 */
471 if (!jtransform_request_workspace(&srcinfo, &transformoption)) {
472 fprintf(stderr, "%s: transformation is not perfect\n", progname);
473 exit(EXIT_FAILURE);
474 }
475 #endif
476
477 /* Read source file as DCT coefficients */
478 src_coef_arrays = jpeg_read_coefficients(&srcinfo);
479
480 /* Initialize destination compression parameters from source values */
481 jpeg_copy_critical_parameters(&srcinfo, &dstinfo);
482
483 /* Adjust destination parameters if required by transform options;
484 * also find out which set of coefficient arrays will hold the output.
485 */
486 #if TRANSFORMS_SUPPORTED
487 dst_coef_arrays = jtransform_adjust_parameters(&srcinfo, &dstinfo,
488 src_coef_arrays,
489 &transformoption);
490 #else
491 dst_coef_arrays = src_coef_arrays;
492 #endif
493
494 /* Close input file, if we opened it.
495 * Note: we assume that jpeg_read_coefficients consumed all input
496 * until JPEG_REACHED_EOI, and that jpeg_finish_decompress will
497 * only consume more while (! cinfo->inputctl->eoi_reached).
498 * We cannot call jpeg_finish_decompress here since we still need the
499 * virtual arrays allocated from the source object for processing.
500 */
501 if (fp != stdin)
502 fclose(fp);
503
504 /* Open the output file. */
505 if (outfilename != NULL) {
506 if ((fp = fopen(outfilename, WRITE_BINARY)) == NULL) {
507 fprintf(stderr, "%s: can't open %s for writing\n", progname, outfilename);
508 exit(EXIT_FAILURE);
509 }
510 } else {
511 /* default output file is stdout */
512 fp = write_stdout();
513 }
514
515 /* Adjust default compression parameters by re-parsing the options */
516 file_index = parse_switches(&dstinfo, argc, argv, 0, TRUE);
517
518 /* Specify data destination for compression */
519 jpeg_stdio_dest(&dstinfo, fp);
520
521 /* Start compressor (note no image data is actually written here) */
522 jpeg_write_coefficients(&dstinfo, dst_coef_arrays);
523
524 /* Copy to the output file any extra markers that we want to preserve */
525 jcopy_markers_execute(&srcinfo, &dstinfo, copyoption);
526
527 /* Execute image transformation, if any */
528 #if TRANSFORMS_SUPPORTED
529 jtransform_execute_transformation(&srcinfo, &dstinfo,
530 src_coef_arrays,
531 &transformoption);
532 #endif
533
534 /* Finish compression and release memory */
535 jpeg_finish_compress(&dstinfo);
536 jpeg_destroy_compress(&dstinfo);
537 (void) jpeg_finish_decompress(&srcinfo);
538 jpeg_destroy_decompress(&srcinfo);
539
540 /* Close output file, if we opened it */
541 if (fp != stdout)
542 fclose(fp);
543
544 #ifdef PROGRESS_REPORT
545 end_progress_monitor((j_common_ptr) &dstinfo);
546 #endif
547
548 /* All done. */
549 exit(jsrcerr.num_warnings + jdsterr.num_warnings ?EXIT_WARNING:EXIT_SUCCESS);
550 return 0; /* suppress no-return-value warnings */
551 }
552