1 /*
2 * cjpeg.c
3 *
4 * Copyright (C) 1991-1998, 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 compressor.
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 * cjpeg [options] inputfile outputfile
14 * cjpeg [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 * cjpeg [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 #ifdef USE_CCOMMAND /* command-line reader for Macintosh */
30 #ifdef __MWERKS__
31 #include <SIOUX.h> /* Metrowerks needs this */
32 #include <console.h> /* ... and this */
33 #endif
34 #ifdef THINK_C
35 #include <console.h> /* Think declares it here */
36 #endif
37 #endif
38
39
40 /* Create the add-on message string table. */
41
42 #define JMESSAGE(code,string) string ,
43
44 static const char * const cdjpeg_message_table[] = {
45 #include "cderror.h"
46 NULL
47 };
48
49
50 /*
51 * This routine determines what format the input file is,
52 * and selects the appropriate input-reading module.
53 *
54 * To determine which family of input formats the file belongs to,
55 * we may look only at the first byte of the file, since C does not
56 * guarantee that more than one character can be pushed back with ungetc.
57 * Looking at additional bytes would require one of these approaches:
58 * 1) assume we can fseek() the input file (fails for piped input);
59 * 2) assume we can push back more than one character (works in
60 * some C implementations, but unportable);
61 * 3) provide our own buffering (breaks input readers that want to use
62 * stdio directly, such as the RLE library);
63 * or 4) don't put back the data, and modify the input_init methods to assume
64 * they start reading after the start of file (also breaks RLE library).
65 * #1 is attractive for MS-DOS but is untenable on Unix.
66 *
67 * The most portable solution for file types that can't be identified by their
68 * first byte is to make the user tell us what they are. This is also the
69 * only approach for "raw" file types that contain only arbitrary values.
70 * We presently apply this method for Targa files. Most of the time Targa
71 * files start with 0x00, so we recognize that case. Potentially, however,
72 * a Targa file could start with any byte value (byte 0 is the length of the
73 * seldom-used ID field), so we provide a switch to force Targa input mode.
74 */
75
76 static boolean is_targa; /* records user -targa switch */
77
78
79 LOCAL(cjpeg_source_ptr)
select_file_type(j_compress_ptr cinfo,FILE * infile)80 select_file_type (j_compress_ptr cinfo, FILE * infile)
81 {
82 int c;
83
84 if (is_targa) {
85 #ifdef TARGA_SUPPORTED
86 return jinit_read_targa(cinfo);
87 #else
88 ERREXIT(cinfo, JERR_TGA_NOTCOMP);
89 #endif
90 }
91
92 if ((c = getc(infile)) == EOF)
93 ERREXIT(cinfo, JERR_INPUT_EMPTY);
94 if (ungetc(c, infile) == EOF)
95 ERREXIT(cinfo, JERR_UNGETC_FAILED);
96
97 switch (c) {
98 #ifdef BMP_SUPPORTED
99 case 'B':
100 return jinit_read_bmp(cinfo);
101 #endif
102 #ifdef GIF_SUPPORTED
103 case 'G':
104 return jinit_read_gif(cinfo);
105 #endif
106 #ifdef PPM_SUPPORTED
107 case 'P':
108 return jinit_read_ppm(cinfo);
109 #endif
110 #ifdef RLE_SUPPORTED
111 case 'R':
112 return jinit_read_rle(cinfo);
113 #endif
114 #ifdef TARGA_SUPPORTED
115 case 0x00:
116 return jinit_read_targa(cinfo);
117 #endif
118 default:
119 ERREXIT(cinfo, JERR_UNKNOWN_FORMAT);
120 break;
121 }
122
123 return NULL; /* suppress compiler warnings */
124 }
125
126
127 /*
128 * Argument-parsing code.
129 * The switch parser is designed to be useful with DOS-style command line
130 * syntax, ie, intermixed switches and file names, where only the switches
131 * to the left of a given file name affect processing of that file.
132 * The main program in this file doesn't actually use this capability...
133 */
134
135
136 static const char * progname; /* program name for error messages */
137 static char * outfilename; /* for -outfile switch */
138
139
140 LOCAL(void)
usage(void)141 usage (void)
142 /* complain about bad command line */
143 {
144 fprintf(stderr, "usage: %s [switches] ", progname);
145 #ifdef TWO_FILE_COMMANDLINE
146 fprintf(stderr, "inputfile outputfile\n");
147 #else
148 fprintf(stderr, "[inputfile]\n");
149 #endif
150
151 fprintf(stderr, "Switches (names may be abbreviated):\n");
152 fprintf(stderr, " -quality N Compression quality (0..100; 5-95 is useful range)\n");
153 fprintf(stderr, " -grayscale Create monochrome JPEG file\n");
154 #ifdef ENTROPY_OPT_SUPPORTED
155 fprintf(stderr, " -optimize Optimize Huffman table (smaller file, but slow compression)\n");
156 #endif
157 #ifdef C_PROGRESSIVE_SUPPORTED
158 fprintf(stderr, " -progressive Create progressive JPEG file\n");
159 #endif
160 #ifdef TARGA_SUPPORTED
161 fprintf(stderr, " -targa Input file is Targa format (usually not needed)\n");
162 #endif
163 fprintf(stderr, "Switches for advanced users:\n");
164 #ifdef DCT_ISLOW_SUPPORTED
165 fprintf(stderr, " -dct int Use integer DCT method%s\n",
166 (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
167 #endif
168 #ifdef DCT_IFAST_SUPPORTED
169 fprintf(stderr, " -dct fast Use fast integer DCT (less accurate)%s\n",
170 (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
171 #endif
172 #ifdef DCT_FLOAT_SUPPORTED
173 fprintf(stderr, " -dct float Use floating-point DCT method%s\n",
174 (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
175 #endif
176 fprintf(stderr, " -restart N Set restart interval in rows, or in blocks with B\n");
177 #ifdef INPUT_SMOOTHING_SUPPORTED
178 fprintf(stderr, " -smooth N Smooth dithered input (N=1..100 is strength)\n");
179 #endif
180 fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n");
181 fprintf(stderr, " -outfile name Specify name for output file\n");
182 fprintf(stderr, " -verbose or -debug Emit debug output\n");
183 fprintf(stderr, "Switches for wizards:\n");
184 #ifdef C_ARITH_CODING_SUPPORTED
185 fprintf(stderr, " -arithmetic Use arithmetic coding\n");
186 #endif
187 fprintf(stderr, " -baseline Force baseline quantization tables\n");
188 fprintf(stderr, " -qtables file Use quantization tables given in file\n");
189 fprintf(stderr, " -qslots N[,...] Set component quantization tables\n");
190 fprintf(stderr, " -sample HxV[,...] Set component sampling factors\n");
191 #ifdef C_MULTISCAN_FILES_SUPPORTED
192 fprintf(stderr, " -scans file Create multi-scan JPEG per script file\n");
193 #endif
194 exit(EXIT_FAILURE);
195 }
196
197
198 LOCAL(int)
parse_switches(j_compress_ptr cinfo,int argc,char ** argv,int last_file_arg_seen,boolean for_real)199 parse_switches (j_compress_ptr cinfo, int argc, char **argv,
200 int last_file_arg_seen, boolean for_real)
201 /* Parse optional switches.
202 * Returns argv[] index of first file-name argument (== argc if none).
203 * Any file names with indexes <= last_file_arg_seen are ignored;
204 * they have presumably been processed in a previous iteration.
205 * (Pass 0 for last_file_arg_seen on the first or only iteration.)
206 * for_real is FALSE on the first (dummy) pass; we may skip any expensive
207 * processing.
208 */
209 {
210 int argn;
211 char * arg;
212 int quality; /* -quality parameter */
213 int q_scale_factor; /* scaling percentage for -qtables */
214 boolean force_baseline;
215 boolean simple_progressive;
216 char * qtablefile = NULL; /* saves -qtables filename if any */
217 char * qslotsarg = NULL; /* saves -qslots parm if any */
218 char * samplearg = NULL; /* saves -sample parm if any */
219 char * scansarg = NULL; /* saves -scans parm if any */
220
221 /* Set up default JPEG parameters. */
222 /* Note that default -quality level need not, and does not,
223 * match the default scaling for an explicit -qtables argument.
224 */
225 quality = 75; /* default -quality value */
226 q_scale_factor = 100; /* default to no scaling for -qtables */
227 force_baseline = FALSE; /* by default, allow 16-bit quantizers */
228 simple_progressive = FALSE;
229 is_targa = FALSE;
230 outfilename = NULL;
231 cinfo->err->trace_level = 0;
232
233 /* Scan command line options, adjust parameters */
234
235 for (argn = 1; argn < argc; argn++) {
236 arg = argv[argn];
237 if (*arg != '-') {
238 /* Not a switch, must be a file name argument */
239 if (argn <= last_file_arg_seen) {
240 outfilename = NULL; /* -outfile applies to just one input file */
241 continue; /* ignore this name if previously processed */
242 }
243 break; /* else done parsing switches */
244 }
245 arg++; /* advance past switch marker character */
246
247 if (keymatch(arg, "arithmetic", 1)) {
248 /* Use arithmetic coding. */
249 #ifdef C_ARITH_CODING_SUPPORTED
250 cinfo->arith_code = TRUE;
251 #else
252 fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",
253 progname);
254 exit(EXIT_FAILURE);
255 #endif
256
257 } else if (keymatch(arg, "baseline", 1)) {
258 /* Force baseline-compatible output (8-bit quantizer values). */
259 force_baseline = TRUE;
260
261 } else if (keymatch(arg, "dct", 2)) {
262 /* Select DCT algorithm. */
263 if (++argn >= argc) /* advance to next argument */
264 usage();
265 if (keymatch(argv[argn], "int", 1)) {
266 cinfo->dct_method = JDCT_ISLOW;
267 } else if (keymatch(argv[argn], "fast", 2)) {
268 cinfo->dct_method = JDCT_IFAST;
269 } else if (keymatch(argv[argn], "float", 2)) {
270 cinfo->dct_method = JDCT_FLOAT;
271 } else
272 usage();
273
274 } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
275 /* Enable debug printouts. */
276 /* On first -d, print version identification */
277 static boolean printed_version = FALSE;
278
279 if (! printed_version) {
280 fprintf(stderr, "Independent JPEG Group's CJPEG, version %s\n%s\n",
281 JVERSION, JCOPYRIGHT);
282 printed_version = TRUE;
283 }
284 cinfo->err->trace_level++;
285
286 } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
287 /* Force a monochrome JPEG file to be generated. */
288 jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);
289
290 } else if (keymatch(arg, "maxmemory", 3)) {
291 /* Maximum memory in Kb (or Mb with 'm'). */
292 long lval;
293 char ch = 'x';
294
295 if (++argn >= argc) /* advance to next argument */
296 usage();
297 if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
298 usage();
299 if (ch == 'm' || ch == 'M')
300 lval *= 1000L;
301 cinfo->mem->max_memory_to_use = lval * 1000L;
302
303 } else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) {
304 /* Enable entropy parm optimization. */
305 #ifdef ENTROPY_OPT_SUPPORTED
306 cinfo->optimize_coding = TRUE;
307 #else
308 fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n",
309 progname);
310 exit(EXIT_FAILURE);
311 #endif
312
313 } else if (keymatch(arg, "outfile", 4)) {
314 /* Set output file name. */
315 if (++argn >= argc) /* advance to next argument */
316 usage();
317 outfilename = argv[argn]; /* save it away for later use */
318
319 } else if (keymatch(arg, "progressive", 1)) {
320 /* Select simple progressive mode. */
321 #ifdef C_PROGRESSIVE_SUPPORTED
322 simple_progressive = TRUE;
323 /* We must postpone execution until num_components is known. */
324 #else
325 fprintf(stderr, "%s: sorry, progressive output was not compiled\n",
326 progname);
327 exit(EXIT_FAILURE);
328 #endif
329
330 } else if (keymatch(arg, "quality", 1)) {
331 /* Quality factor (quantization table scaling factor). */
332 if (++argn >= argc) /* advance to next argument */
333 usage();
334 if (sscanf(argv[argn], "%d", &quality) != 1)
335 usage();
336 /* Change scale factor in case -qtables is present. */
337 q_scale_factor = jpeg_quality_scaling(quality);
338
339 } else if (keymatch(arg, "qslots", 2)) {
340 /* Quantization table slot numbers. */
341 if (++argn >= argc) /* advance to next argument */
342 usage();
343 qslotsarg = argv[argn];
344 /* Must delay setting qslots until after we have processed any
345 * colorspace-determining switches, since jpeg_set_colorspace sets
346 * default quant table numbers.
347 */
348
349 } else if (keymatch(arg, "qtables", 2)) {
350 /* Quantization tables fetched from file. */
351 if (++argn >= argc) /* advance to next argument */
352 usage();
353 qtablefile = argv[argn];
354 /* We postpone actually reading the file in case -quality comes later. */
355
356 } else if (keymatch(arg, "restart", 1)) {
357 /* Restart interval in MCU rows (or in MCUs with 'b'). */
358 long lval;
359 char ch = 'x';
360
361 if (++argn >= argc) /* advance to next argument */
362 usage();
363 if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
364 usage();
365 if (lval < 0 || lval > 65535L)
366 usage();
367 if (ch == 'b' || ch == 'B') {
368 cinfo->restart_interval = (unsigned int) lval;
369 cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */
370 } else {
371 cinfo->restart_in_rows = (int) lval;
372 /* restart_interval will be computed during startup */
373 }
374
375 } else if (keymatch(arg, "sample", 2)) {
376 /* Set sampling factors. */
377 if (++argn >= argc) /* advance to next argument */
378 usage();
379 samplearg = argv[argn];
380 /* Must delay setting sample factors until after we have processed any
381 * colorspace-determining switches, since jpeg_set_colorspace sets
382 * default sampling factors.
383 */
384
385 } else if (keymatch(arg, "scans", 2)) {
386 /* Set scan script. */
387 #ifdef C_MULTISCAN_FILES_SUPPORTED
388 if (++argn >= argc) /* advance to next argument */
389 usage();
390 scansarg = argv[argn];
391 /* We must postpone reading the file in case -progressive appears. */
392 #else
393 fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n",
394 progname);
395 exit(EXIT_FAILURE);
396 #endif
397
398 } else if (keymatch(arg, "smooth", 2)) {
399 /* Set input smoothing factor. */
400 int val;
401
402 if (++argn >= argc) /* advance to next argument */
403 usage();
404 if (sscanf(argv[argn], "%d", &val) != 1)
405 usage();
406 if (val < 0 || val > 100)
407 usage();
408 cinfo->smoothing_factor = val;
409
410 } else if (keymatch(arg, "targa", 1)) {
411 /* Input file is Targa format. */
412 is_targa = TRUE;
413
414 } else {
415 usage(); /* bogus switch */
416 }
417 }
418
419 /* Post-switch-scanning cleanup */
420
421 if (for_real) {
422
423 /* Set quantization tables for selected quality. */
424 /* Some or all may be overridden if -qtables is present. */
425 jpeg_set_quality(cinfo, quality, force_baseline);
426
427 if (qtablefile != NULL) /* process -qtables if it was present */
428 if (! read_quant_tables(cinfo, qtablefile,
429 q_scale_factor, force_baseline))
430 usage();
431
432 if (qslotsarg != NULL) /* process -qslots if it was present */
433 if (! set_quant_slots(cinfo, qslotsarg))
434 usage();
435
436 if (samplearg != NULL) /* process -sample if it was present */
437 if (! set_sample_factors(cinfo, samplearg))
438 usage();
439
440 #ifdef C_PROGRESSIVE_SUPPORTED
441 if (simple_progressive) /* process -progressive; -scans can override */
442 jpeg_simple_progression(cinfo);
443 #endif
444
445 #ifdef C_MULTISCAN_FILES_SUPPORTED
446 if (scansarg != NULL) /* process -scans if it was present */
447 if (! read_scan_script(cinfo, scansarg))
448 usage();
449 #endif
450 }
451
452 return argn; /* return index of next arg (file name) */
453 }
454
455
456 /*
457 * The main program.
458 */
459
460 int
main(int argc,char ** argv)461 main (int argc, char **argv)
462 {
463 struct jpeg_compress_struct cinfo;
464 struct jpeg_error_mgr jerr;
465 #ifdef PROGRESS_REPORT
466 struct cdjpeg_progress_mgr progress;
467 #endif
468 int file_index;
469 cjpeg_source_ptr src_mgr;
470 FILE * input_file;
471 FILE * output_file;
472 JDIMENSION num_scanlines;
473
474 /* On Mac, fetch a command line. */
475 #ifdef USE_CCOMMAND
476 argc = ccommand(&argv);
477 #endif
478
479 progname = argv[0];
480 if (progname == NULL || progname[0] == 0)
481 progname = "cjpeg"; /* in case C library doesn't provide it */
482
483 /* Initialize the JPEG compression object with default error handling. */
484 cinfo.err = jpeg_std_error(&jerr);
485 jpeg_create_compress(&cinfo);
486 /* Add some application-specific error messages (from cderror.h) */
487 jerr.addon_message_table = cdjpeg_message_table;
488 jerr.first_addon_message = JMSG_FIRSTADDONCODE;
489 jerr.last_addon_message = JMSG_LASTADDONCODE;
490
491 /* Now safe to enable signal catcher. */
492 #ifdef NEED_SIGNAL_CATCHER
493 enable_signal_catcher((j_common_ptr) &cinfo);
494 #endif
495
496 /* Initialize JPEG parameters.
497 * Much of this may be overridden later.
498 * In particular, we don't yet know the input file's color space,
499 * but we need to provide some value for jpeg_set_defaults() to work.
500 */
501
502 cinfo.in_color_space = JCS_RGB; /* arbitrary guess */
503 jpeg_set_defaults(&cinfo);
504
505 /* Scan command line to find file names.
506 * It is convenient to use just one switch-parsing routine, but the switch
507 * values read here are ignored; we will rescan the switches after opening
508 * the input file.
509 */
510
511 file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
512
513 #ifdef TWO_FILE_COMMANDLINE
514 /* Must have either -outfile switch or explicit output file name */
515 if (outfilename == NULL) {
516 if (file_index != argc-2) {
517 fprintf(stderr, "%s: must name one input and one output file\n",
518 progname);
519 usage();
520 }
521 outfilename = argv[file_index+1];
522 } else {
523 if (file_index != argc-1) {
524 fprintf(stderr, "%s: must name one input and one output file\n",
525 progname);
526 usage();
527 }
528 }
529 #else
530 /* Unix style: expect zero or one file name */
531 if (file_index < argc-1) {
532 fprintf(stderr, "%s: only one input file\n", progname);
533 usage();
534 }
535 #endif /* TWO_FILE_COMMANDLINE */
536
537 /* Open the input file. */
538 if (file_index < argc) {
539 if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
540 fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
541 exit(EXIT_FAILURE);
542 }
543 } else {
544 /* default input file is stdin */
545 input_file = read_stdin();
546 }
547
548 /* Open the output file. */
549 if (outfilename != NULL) {
550 if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
551 fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
552 exit(EXIT_FAILURE);
553 }
554 } else {
555 /* default output file is stdout */
556 output_file = write_stdout();
557 }
558
559 #ifdef PROGRESS_REPORT
560 start_progress_monitor((j_common_ptr) &cinfo, &progress);
561 #endif
562
563 /* Figure out the input file format, and set up to read it. */
564 src_mgr = select_file_type(&cinfo, input_file);
565 src_mgr->input_file = input_file;
566
567 /* Read the input file header to obtain file size & colorspace. */
568 (*src_mgr->start_input) (&cinfo, src_mgr);
569
570 /* Now that we know input colorspace, fix colorspace-dependent defaults */
571 jpeg_default_colorspace(&cinfo);
572
573 /* Adjust default compression parameters by re-parsing the options */
574 file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
575
576 /* Specify data destination for compression */
577 jpeg_stdio_dest(&cinfo, output_file);
578
579 /* Start compressor */
580 jpeg_start_compress(&cinfo, TRUE);
581
582 /* Process data */
583 while (cinfo.next_scanline < cinfo.image_height) {
584 num_scanlines = (*src_mgr->get_pixel_rows) (&cinfo, src_mgr);
585 (void) jpeg_write_scanlines(&cinfo, src_mgr->buffer, num_scanlines);
586 }
587
588 /* Finish compression and release memory */
589 (*src_mgr->finish_input) (&cinfo, src_mgr);
590 jpeg_finish_compress(&cinfo);
591 jpeg_destroy_compress(&cinfo);
592
593 /* Close files, if we opened them */
594 if (input_file != stdin)
595 fclose(input_file);
596 if (output_file != stdout)
597 fclose(output_file);
598
599 #ifdef PROGRESS_REPORT
600 end_progress_monitor((j_common_ptr) &cinfo);
601 #endif
602
603 /* All done. */
604 exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
605 return 0; /* suppress no-return-value warnings */
606 }
607