1 /*
2 * djpeg.c
3 *
4 * Copyright (C) 1991-1997, Thomas G. Lane.
5 * This file is part of the Independent JPEG Group's software.
6 * For conditions of distribution and use, see the accompanying README file.
7 *
8 * This file contains a command-line user interface for the JPEG decompressor.
9 * It should work on any system with Unix- or MS-DOS-style command lines.
10 *
11 * Two different command line styles are permitted, depending on the
12 * compile-time switch TWO_FILE_COMMANDLINE:
13 * djpeg [options] inputfile outputfile
14 * djpeg [options] [inputfile]
15 * In the second style, output is always to standard output, which you'd
16 * normally redirect to a file or pipe to some other program. Input is
17 * either from a named file or from standard input (typically redirected).
18 * The second style is convenient on Unix but is unhelpful on systems that
19 * don't support pipes. Also, you MUST use the first style if your system
20 * doesn't do binary I/O to stdin/stdout.
21 * To simplify script writing, the "-outfile" switch is provided. The syntax
22 * djpeg [options] -outfile outputfile inputfile
23 * works regardless of which command line style is used.
24 */
25
26 #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
27 #include "jversion.h" /* for version message */
28
29 #include <ctype.h> /* to declare isprint() */
30
31 #ifdef USE_CCOMMAND /* command-line reader for Macintosh */
32 #ifdef __MWERKS__
33 #include <SIOUX.h> /* Metrowerks needs this */
34 #include <console.h> /* ... and this */
35 #endif
36 #ifdef THINK_C
37 #include <console.h> /* Think declares it here */
38 #endif
39 #endif
40
41
42 /* Create the add-on message string table. */
43
44 #define JMESSAGE(code,string) string ,
45
46 static const char * const cdjpeg_message_table[] = {
47 #include "cderror.h"
48 NULL
49 };
50
51
52 /*
53 * This list defines the known output image formats
54 * (not all of which need be supported by a given version).
55 * You can change the default output format by defining DEFAULT_FMT;
56 * indeed, you had better do so if you undefine PPM_SUPPORTED.
57 */
58
59 typedef enum {
60 FMT_BMP, /* BMP format (Windows flavor) */
61 FMT_GIF, /* GIF format */
62 FMT_OS2, /* BMP format (OS/2 flavor) */
63 FMT_PPM, /* PPM/PGM (PBMPLUS formats) */
64 FMT_RLE, /* RLE format */
65 FMT_TARGA, /* Targa format */
66 FMT_TIFF /* TIFF format */
67 } IMAGE_FORMATS;
68
69 #ifndef DEFAULT_FMT /* so can override from CFLAGS in Makefile */
70 #define DEFAULT_FMT FMT_PPM
71 #endif
72
73 static IMAGE_FORMATS requested_fmt;
74
75
76 /*
77 * Argument-parsing code.
78 * The switch parser is designed to be useful with DOS-style command line
79 * syntax, ie, intermixed switches and file names, where only the switches
80 * to the left of a given file name affect processing of that file.
81 * The main program in this file doesn't actually use this capability...
82 */
83
84
85 static const char * progname; /* program name for error messages */
86 static char * outfilename; /* for -outfile switch */
87
88
89 LOCAL(void)
usage(void)90 usage (void)
91 /* complain about bad command line */
92 {
93 fprintf(stderr, "usage: %s [switches] ", progname);
94 #ifdef TWO_FILE_COMMANDLINE
95 fprintf(stderr, "inputfile outputfile\n");
96 #else
97 fprintf(stderr, "[inputfile]\n");
98 #endif
99
100 fprintf(stderr, "Switches (names may be abbreviated):\n");
101 fprintf(stderr, " -colors N Reduce image to no more than N colors\n");
102 fprintf(stderr, " -fast Fast, low-quality processing\n");
103 fprintf(stderr, " -grayscale Force grayscale output\n");
104 #ifdef IDCT_SCALING_SUPPORTED
105 fprintf(stderr, " -scale M/N Scale output image by fraction M/N, eg, 1/8\n");
106 #endif
107 #ifdef BMP_SUPPORTED
108 fprintf(stderr, " -bmp Select BMP output format (Windows style)%s\n",
109 (DEFAULT_FMT == FMT_BMP ? " (default)" : ""));
110 #endif
111 #ifdef GIF_SUPPORTED
112 fprintf(stderr, " -gif Select GIF output format%s\n",
113 (DEFAULT_FMT == FMT_GIF ? " (default)" : ""));
114 #endif
115 #ifdef BMP_SUPPORTED
116 fprintf(stderr, " -os2 Select BMP output format (OS/2 style)%s\n",
117 (DEFAULT_FMT == FMT_OS2 ? " (default)" : ""));
118 #endif
119 #ifdef PPM_SUPPORTED
120 fprintf(stderr, " -pnm Select PBMPLUS (PPM/PGM) output format%s\n",
121 (DEFAULT_FMT == FMT_PPM ? " (default)" : ""));
122 #endif
123 #ifdef RLE_SUPPORTED
124 fprintf(stderr, " -rle Select Utah RLE output format%s\n",
125 (DEFAULT_FMT == FMT_RLE ? " (default)" : ""));
126 #endif
127 #ifdef TARGA_SUPPORTED
128 fprintf(stderr, " -targa Select Targa output format%s\n",
129 (DEFAULT_FMT == FMT_TARGA ? " (default)" : ""));
130 #endif
131 fprintf(stderr, "Switches for advanced users:\n");
132 #ifdef DCT_ISLOW_SUPPORTED
133 fprintf(stderr, " -dct int Use integer DCT method%s\n",
134 (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
135 #endif
136 #ifdef DCT_IFAST_SUPPORTED
137 fprintf(stderr, " -dct fast Use fast integer DCT (less accurate)%s\n",
138 (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
139 #endif
140 #ifdef DCT_FLOAT_SUPPORTED
141 fprintf(stderr, " -dct float Use floating-point DCT method%s\n",
142 (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
143 #endif
144 fprintf(stderr, " -dither fs Use F-S dithering (default)\n");
145 fprintf(stderr, " -dither none Don't use dithering in quantization\n");
146 fprintf(stderr, " -dither ordered Use ordered dither (medium speed, quality)\n");
147 #ifdef QUANT_2PASS_SUPPORTED
148 fprintf(stderr, " -map FILE Map to colors used in named image file\n");
149 #endif
150 fprintf(stderr, " -nosmooth Don't use high-quality upsampling\n");
151 #ifdef QUANT_1PASS_SUPPORTED
152 fprintf(stderr, " -onepass Use 1-pass quantization (fast, low quality)\n");
153 #endif
154 fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n");
155 fprintf(stderr, " -outfile name Specify name for output file\n");
156 fprintf(stderr, " -verbose or -debug Emit debug output\n");
157 exit(EXIT_FAILURE);
158 }
159
160
161 LOCAL(int)
parse_switches(j_decompress_ptr cinfo,int argc,char ** argv,int last_file_arg_seen,boolean for_real)162 parse_switches (j_decompress_ptr cinfo, int argc, char **argv,
163 int last_file_arg_seen, boolean for_real)
164 /* Parse optional switches.
165 * Returns argv[] index of first file-name argument (== argc if none).
166 * Any file names with indexes <= last_file_arg_seen are ignored;
167 * they have presumably been processed in a previous iteration.
168 * (Pass 0 for last_file_arg_seen on the first or only iteration.)
169 * for_real is FALSE on the first (dummy) pass; we may skip any expensive
170 * processing.
171 */
172 {
173 int argn;
174 char * arg;
175
176 /* Set up default JPEG parameters. */
177 requested_fmt = DEFAULT_FMT; /* set default output file format */
178 outfilename = NULL;
179 cinfo->err->trace_level = 0;
180
181 /* Scan command line options, adjust parameters */
182
183 for (argn = 1; argn < argc; argn++) {
184 arg = argv[argn];
185 if (*arg != '-') {
186 /* Not a switch, must be a file name argument */
187 if (argn <= last_file_arg_seen) {
188 outfilename = NULL; /* -outfile applies to just one input file */
189 continue; /* ignore this name if previously processed */
190 }
191 break; /* else done parsing switches */
192 }
193 arg++; /* advance past switch marker character */
194
195 if (keymatch(arg, "bmp", 1)) {
196 /* BMP output format. */
197 requested_fmt = FMT_BMP;
198
199 } else if (keymatch(arg, "colors", 1) || keymatch(arg, "colours", 1) ||
200 keymatch(arg, "quantize", 1) || keymatch(arg, "quantise", 1)) {
201 /* Do color quantization. */
202 int val;
203
204 if (++argn >= argc) /* advance to next argument */
205 usage();
206 if (sscanf(argv[argn], "%d", &val) != 1)
207 usage();
208 cinfo->desired_number_of_colors = val;
209 cinfo->quantize_colors = TRUE;
210
211 } else if (keymatch(arg, "dct", 2)) {
212 /* Select IDCT algorithm. */
213 if (++argn >= argc) /* advance to next argument */
214 usage();
215 if (keymatch(argv[argn], "int", 1)) {
216 cinfo->dct_method = JDCT_ISLOW;
217 } else if (keymatch(argv[argn], "fast", 2)) {
218 cinfo->dct_method = JDCT_IFAST;
219 } else if (keymatch(argv[argn], "float", 2)) {
220 cinfo->dct_method = JDCT_FLOAT;
221 } else
222 usage();
223
224 } else if (keymatch(arg, "dither", 2)) {
225 /* Select dithering algorithm. */
226 if (++argn >= argc) /* advance to next argument */
227 usage();
228 if (keymatch(argv[argn], "fs", 2)) {
229 cinfo->dither_mode = JDITHER_FS;
230 } else if (keymatch(argv[argn], "none", 2)) {
231 cinfo->dither_mode = JDITHER_NONE;
232 } else if (keymatch(argv[argn], "ordered", 2)) {
233 cinfo->dither_mode = JDITHER_ORDERED;
234 } else
235 usage();
236
237 } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
238 /* Enable debug printouts. */
239 /* On first -d, print version identification */
240 static boolean printed_version = FALSE;
241
242 if (! printed_version) {
243 fprintf(stderr, "Independent JPEG Group's DJPEG, version %s\n%s\n",
244 JVERSION, JCOPYRIGHT);
245 printed_version = TRUE;
246 }
247 cinfo->err->trace_level++;
248
249 } else if (keymatch(arg, "fast", 1)) {
250 /* Select recommended processing options for quick-and-dirty output. */
251 cinfo->two_pass_quantize = FALSE;
252 cinfo->dither_mode = JDITHER_ORDERED;
253 if (! cinfo->quantize_colors) /* don't override an earlier -colors */
254 cinfo->desired_number_of_colors = 216;
255 cinfo->dct_method = JDCT_FASTEST;
256 cinfo->do_fancy_upsampling = FALSE;
257
258 } else if (keymatch(arg, "gif", 1)) {
259 /* GIF output format. */
260 requested_fmt = FMT_GIF;
261
262 } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
263 /* Force monochrome output. */
264 cinfo->out_color_space = JCS_GRAYSCALE;
265
266 } else if (keymatch(arg, "map", 3)) {
267 /* Quantize to a color map taken from an input file. */
268 if (++argn >= argc) /* advance to next argument */
269 usage();
270 if (for_real) { /* too expensive to do twice! */
271 #ifdef QUANT_2PASS_SUPPORTED /* otherwise can't quantize to supplied map */
272 FILE * mapfile;
273
274 if ((mapfile = fopen(argv[argn], READ_BINARY)) == NULL) {
275 fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]);
276 exit(EXIT_FAILURE);
277 }
278 read_color_map(cinfo, mapfile);
279 fclose(mapfile);
280 cinfo->quantize_colors = TRUE;
281 #else
282 ERREXIT(cinfo, JERR_NOT_COMPILED);
283 #endif
284 }
285
286 } else if (keymatch(arg, "maxmemory", 3)) {
287 /* Maximum memory in Kb (or Mb with 'm'). */
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 (ch == 'm' || ch == 'M')
296 lval *= 1000L;
297 cinfo->mem->max_memory_to_use = lval * 1000L;
298
299 } else if (keymatch(arg, "nosmooth", 3)) {
300 /* Suppress fancy upsampling */
301 cinfo->do_fancy_upsampling = FALSE;
302
303 } else if (keymatch(arg, "onepass", 3)) {
304 /* Use fast one-pass quantization. */
305 cinfo->two_pass_quantize = FALSE;
306
307 } else if (keymatch(arg, "os2", 3)) {
308 /* BMP output format (OS/2 flavor). */
309 requested_fmt = FMT_OS2;
310
311 } else if (keymatch(arg, "outfile", 4)) {
312 /* Set output file name. */
313 if (++argn >= argc) /* advance to next argument */
314 usage();
315 outfilename = argv[argn]; /* save it away for later use */
316
317 } else if (keymatch(arg, "pnm", 1) || keymatch(arg, "ppm", 1)) {
318 /* PPM/PGM output format. */
319 requested_fmt = FMT_PPM;
320
321 } else if (keymatch(arg, "rle", 1)) {
322 /* RLE output format. */
323 requested_fmt = FMT_RLE;
324
325 } else if (keymatch(arg, "scale", 1)) {
326 /* Scale the output image by a fraction M/N. */
327 if (++argn >= argc) /* advance to next argument */
328 usage();
329 if (sscanf(argv[argn], "%d/%d",
330 &cinfo->scale_num, &cinfo->scale_denom) != 2)
331 usage();
332
333 } else if (keymatch(arg, "targa", 1)) {
334 /* Targa output format. */
335 requested_fmt = FMT_TARGA;
336
337 } else {
338 usage(); /* bogus switch */
339 }
340 }
341
342 return argn; /* return index of next arg (file name) */
343 }
344
345
346 /*
347 * Marker processor for COM and interesting APPn markers.
348 * This replaces the library's built-in processor, which just skips the marker.
349 * We want to print out the marker as text, to the extent possible.
350 * Note this code relies on a non-suspending data source.
351 */
352
353 LOCAL(unsigned int)
jpeg_getc(j_decompress_ptr cinfo)354 jpeg_getc (j_decompress_ptr cinfo)
355 /* Read next byte */
356 {
357 struct jpeg_source_mgr * datasrc = cinfo->src;
358
359 if (datasrc->bytes_in_buffer == 0) {
360 if (! (*datasrc->fill_input_buffer) (cinfo))
361 ERREXIT(cinfo, JERR_CANT_SUSPEND);
362 }
363 datasrc->bytes_in_buffer--;
364 return GETJOCTET(*datasrc->next_input_byte++);
365 }
366
367
368 METHODDEF(boolean)
print_text_marker(j_decompress_ptr cinfo)369 print_text_marker (j_decompress_ptr cinfo)
370 {
371 boolean traceit = (cinfo->err->trace_level >= 1);
372 INT32 length;
373 unsigned int ch;
374 unsigned int lastch = 0;
375
376 length = jpeg_getc(cinfo) << 8;
377 length += jpeg_getc(cinfo);
378 length -= 2; /* discount the length word itself */
379
380 if (traceit) {
381 if (cinfo->unread_marker == JPEG_COM)
382 fprintf(stderr, "Comment, length %ld:\n", (long) length);
383 else /* assume it is an APPn otherwise */
384 fprintf(stderr, "APP%d, length %ld:\n",
385 cinfo->unread_marker - JPEG_APP0, (long) length);
386 }
387
388 while (--length >= 0) {
389 ch = jpeg_getc(cinfo);
390 if (traceit) {
391 /* Emit the character in a readable form.
392 * Nonprintables are converted to \nnn form,
393 * while \ is converted to \\.
394 * Newlines in CR, CR/LF, or LF form will be printed as one newline.
395 */
396 if (ch == '\r') {
397 fprintf(stderr, "\n");
398 } else if (ch == '\n') {
399 if (lastch != '\r')
400 fprintf(stderr, "\n");
401 } else if (ch == '\\') {
402 fprintf(stderr, "\\\\");
403 } else if (isprint(ch)) {
404 putc(ch, stderr);
405 } else {
406 fprintf(stderr, "\\%03o", ch);
407 }
408 lastch = ch;
409 }
410 }
411
412 if (traceit)
413 fprintf(stderr, "\n");
414
415 return TRUE;
416 }
417
418
419 /*
420 * The main program.
421 */
422
423 int
main(int argc,char ** argv)424 main (int argc, char **argv)
425 {
426 struct jpeg_decompress_struct cinfo;
427 struct jpeg_error_mgr jerr;
428 #ifdef PROGRESS_REPORT
429 struct cdjpeg_progress_mgr progress;
430 #endif
431 int file_index;
432 djpeg_dest_ptr dest_mgr = NULL;
433 FILE * input_file;
434 FILE * output_file;
435 JDIMENSION num_scanlines;
436
437 /* On Mac, fetch a command line. */
438 #ifdef USE_CCOMMAND
439 argc = ccommand(&argv);
440 #endif
441
442 progname = argv[0];
443 if (progname == NULL || progname[0] == 0)
444 progname = "djpeg"; /* in case C library doesn't provide it */
445
446 /* Initialize the JPEG decompression object with default error handling. */
447 cinfo.err = jpeg_std_error(&jerr);
448 jpeg_create_decompress(&cinfo);
449 /* Add some application-specific error messages (from cderror.h) */
450 jerr.addon_message_table = cdjpeg_message_table;
451 jerr.first_addon_message = JMSG_FIRSTADDONCODE;
452 jerr.last_addon_message = JMSG_LASTADDONCODE;
453
454 /* Insert custom marker processor for COM and APP12.
455 * APP12 is used by some digital camera makers for textual info,
456 * so we provide the ability to display it as text.
457 * If you like, additional APPn marker types can be selected for display,
458 * but don't try to override APP0 or APP14 this way (see libjpeg.doc).
459 */
460 jpeg_set_marker_processor(&cinfo, JPEG_COM, print_text_marker);
461 jpeg_set_marker_processor(&cinfo, JPEG_APP0+12, print_text_marker);
462
463 /* Now safe to enable signal catcher. */
464 #ifdef NEED_SIGNAL_CATCHER
465 enable_signal_catcher((j_common_ptr) &cinfo);
466 #endif
467
468 /* Scan command line to find file names. */
469 /* It is convenient to use just one switch-parsing routine, but the switch
470 * values read here are ignored; we will rescan the switches after opening
471 * the input file.
472 * (Exception: tracing level set here controls verbosity for COM markers
473 * found during jpeg_read_header...)
474 */
475
476 file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
477
478 #ifdef TWO_FILE_COMMANDLINE
479 /* Must have either -outfile switch or explicit output file name */
480 if (outfilename == NULL) {
481 if (file_index != argc-2) {
482 fprintf(stderr, "%s: must name one input and one output file\n",
483 progname);
484 usage();
485 }
486 outfilename = argv[file_index+1];
487 } else {
488 if (file_index != argc-1) {
489 fprintf(stderr, "%s: must name one input and one output file\n",
490 progname);
491 usage();
492 }
493 }
494 #else
495 /* Unix style: expect zero or one file name */
496 if (file_index < argc-1) {
497 fprintf(stderr, "%s: only one input file\n", progname);
498 usage();
499 }
500 #endif /* TWO_FILE_COMMANDLINE */
501
502 /* Open the input file. */
503 if (file_index < argc) {
504 if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
505 fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
506 exit(EXIT_FAILURE);
507 }
508 } else {
509 /* default input file is stdin */
510 input_file = read_stdin();
511 }
512
513 /* Open the output file. */
514 if (outfilename != NULL) {
515 if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
516 fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
517 exit(EXIT_FAILURE);
518 }
519 } else {
520 /* default output file is stdout */
521 output_file = write_stdout();
522 }
523
524 #ifdef PROGRESS_REPORT
525 start_progress_monitor((j_common_ptr) &cinfo, &progress);
526 #endif
527
528 /* Specify data source for decompression */
529 jpeg_stdio_src(&cinfo, input_file);
530
531 /* Read file header, set default decompression parameters */
532 (void) jpeg_read_header(&cinfo, TRUE);
533
534 /* Adjust default decompression parameters by re-parsing the options */
535 file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
536
537 /* Initialize the output module now to let it override any crucial
538 * option settings (for instance, GIF wants to force color quantization).
539 */
540 switch (requested_fmt) {
541 #ifdef BMP_SUPPORTED
542 case FMT_BMP:
543 dest_mgr = jinit_write_bmp(&cinfo, FALSE);
544 break;
545 case FMT_OS2:
546 dest_mgr = jinit_write_bmp(&cinfo, TRUE);
547 break;
548 #endif
549 #ifdef GIF_SUPPORTED
550 case FMT_GIF:
551 dest_mgr = jinit_write_gif(&cinfo);
552 break;
553 #endif
554 #ifdef PPM_SUPPORTED
555 case FMT_PPM:
556 dest_mgr = jinit_write_ppm(&cinfo);
557 break;
558 #endif
559 #ifdef RLE_SUPPORTED
560 case FMT_RLE:
561 dest_mgr = jinit_write_rle(&cinfo);
562 break;
563 #endif
564 #ifdef TARGA_SUPPORTED
565 case FMT_TARGA:
566 dest_mgr = jinit_write_targa(&cinfo);
567 break;
568 #endif
569 default:
570 ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT);
571 break;
572 }
573 dest_mgr->output_file = output_file;
574
575 /* Start decompressor */
576 (void) jpeg_start_decompress(&cinfo);
577
578 /* Write output file header */
579 (*dest_mgr->start_output) (&cinfo, dest_mgr);
580
581 /* Process data */
582 while (cinfo.output_scanline < cinfo.output_height) {
583 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
584 dest_mgr->buffer_height);
585 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
586 }
587
588 #ifdef PROGRESS_REPORT
589 /* Hack: count final pass as done in case finish_output does an extra pass.
590 * The library won't have updated completed_passes.
591 */
592 progress.pub.completed_passes = progress.pub.total_passes;
593 #endif
594
595 /* Finish decompression and release memory.
596 * I must do it in this order because output module has allocated memory
597 * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory.
598 */
599 (*dest_mgr->finish_output) (&cinfo, dest_mgr);
600 (void) jpeg_finish_decompress(&cinfo);
601 jpeg_destroy_decompress(&cinfo);
602
603 /* Close files, if we opened them */
604 if (input_file != stdin)
605 fclose(input_file);
606 if (output_file != stdout)
607 fclose(output_file);
608
609 #ifdef PROGRESS_REPORT
610 end_progress_monitor((j_common_ptr) &cinfo);
611 #endif
612
613 /* All done. */
614 exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
615 return 0; /* suppress no-return-value warnings */
616 }
617