1 /*
2 * djpeg.c
3 *
4 * Copyright (C) 1991-1994, 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 #define JMAKE_MSG_TABLE
28 #include "cderror.h" /* create message string table */
29 #include "jversion.h" /* for version message */
30
31 #include <ctype.h> /* to declare isupper(),tolower(),isprint() */
32 #ifdef NEED_SIGNAL_CATCHER
33 #include <signal.h> /* to declare signal() */
34 #endif
35 #ifdef USE_SETMODE
36 #include <fcntl.h> /* to declare setmode()'s parameter macros */
37 /* If you have setmode() but not <io.h>, just delete this line: */
38 #include <io.h> /* to declare setmode() */
39 #endif
40
41 #ifdef USE_CCOMMAND /* command-line reader for Macintosh */
42 #ifdef __MWERKS__
43 #include <SIOUX.h> /* Metrowerks declares it here */
44 #endif
45 #ifdef THINK_C
46 #include <console.h> /* Think declares it here */
47 #endif
48 #endif
49
50 #ifdef DONT_USE_B_MODE /* define mode parameters for fopen() */
51 #define READ_BINARY "r"
52 #define WRITE_BINARY "w"
53 #else
54 #define READ_BINARY "rb"
55 #define WRITE_BINARY "wb"
56 #endif
57
58 #ifndef EXIT_FAILURE /* define exit() codes if not provided */
59 #define EXIT_FAILURE 1
60 #endif
61 #ifndef EXIT_SUCCESS
62 #ifdef VMS
63 #define EXIT_SUCCESS 1 /* VMS is very nonstandard */
64 #else
65 #define EXIT_SUCCESS 0
66 #endif
67 #endif
68 #ifndef EXIT_WARNING
69 #ifdef VMS
70 #define EXIT_WARNING 1 /* VMS is very nonstandard */
71 #else
72 #define EXIT_WARNING 2
73 #endif
74 #endif
75
76
77 /*
78 * This list defines the known output image formats
79 * (not all of which need be supported by a given version).
80 * You can change the default output format by defining DEFAULT_FMT;
81 * indeed, you had better do so if you undefine PPM_SUPPORTED.
82 */
83
84 typedef enum {
85 FMT_BMP, /* BMP format (Windows flavor) */
86 FMT_GIF, /* GIF format */
87 FMT_OS2, /* BMP format (OS/2 flavor) */
88 FMT_PPM, /* PPM/PGM (PBMPLUS formats) */
89 FMT_RLE, /* RLE format */
90 FMT_TARGA, /* Targa format */
91 FMT_TIFF /* TIFF format */
92 } IMAGE_FORMATS;
93
94 #ifndef DEFAULT_FMT /* so can override from CFLAGS in Makefile */
95 #define DEFAULT_FMT FMT_PPM
96 #endif
97
98 static IMAGE_FORMATS requested_fmt;
99
100
101 /*
102 * Signal catcher to ensure that temporary files are removed before aborting.
103 * NB: for Amiga Manx C this is actually a global routine named _abort();
104 * we put "#define signal_catcher _abort" in jconfig.h. Talk about bogus...
105 */
106
107 #ifdef NEED_SIGNAL_CATCHER
108
109 static j_common_ptr sig_cinfo;
110
111 GLOBAL void
signal_catcher(int signum)112 signal_catcher (int signum)
113 {
114 if (sig_cinfo != NULL) {
115 if (sig_cinfo->err != NULL) /* turn off trace output */
116 sig_cinfo->err->trace_level = 0;
117 jpeg_destroy(sig_cinfo); /* clean up memory allocation & temp files */
118 }
119 exit(EXIT_FAILURE);
120 }
121
122 #endif
123
124
125 /*
126 * Optional routine to display a percent-done figure on stderr.
127 */
128
129 #ifdef PROGRESS_REPORT
130
131 METHODDEF void
progress_monitor(j_common_ptr cinfo)132 progress_monitor (j_common_ptr cinfo)
133 {
134 cd_progress_ptr prog = (cd_progress_ptr) cinfo->progress;
135 int total_passes = prog->pub.total_passes + prog->total_extra_passes;
136 int percent_done = (int) (prog->pub.pass_counter*100L/prog->pub.pass_limit);
137
138 if (percent_done != prog->percent_done) {
139 prog->percent_done = percent_done;
140 if (total_passes > 1) {
141 fprintf(stderr, "\rPass %d/%d: %3d%% ",
142 prog->pub.completed_passes + prog->completed_extra_passes + 1,
143 total_passes, percent_done);
144 } else {
145 fprintf(stderr, "\r %3d%% ", percent_done);
146 }
147 fflush(stderr);
148 }
149 }
150
151 #endif
152
153
154 /*
155 * Argument-parsing code.
156 * The switch parser is designed to be useful with DOS-style command line
157 * syntax, ie, intermixed switches and file names, where only the switches
158 * to the left of a given file name affect processing of that file.
159 * The main program in this file doesn't actually use this capability...
160 */
161
162
163 static const char * progname; /* program name for error messages */
164 static char * outfilename; /* for -outfile switch */
165
166
167 LOCAL void
usage(void)168 usage (void)
169 /* complain about bad command line */
170 {
171 fprintf(stderr, "usage: %s [switches] ", progname);
172 #ifdef TWO_FILE_COMMANDLINE
173 fprintf(stderr, "inputfile outputfile\n");
174 #else
175 fprintf(stderr, "[inputfile]\n");
176 #endif
177
178 fprintf(stderr, "Switches (names may be abbreviated):\n");
179 fprintf(stderr, " -colors N Reduce image to no more than N colors\n");
180 fprintf(stderr, " -fast Fast, low-quality processing\n");
181 fprintf(stderr, " -grayscale Force grayscale output\n");
182 #ifdef IDCT_SCALING_SUPPORTED
183 fprintf(stderr, " -scale M/N Scale output image by fraction M/N, eg, 1/8\n");
184 #endif
185 #ifdef BMP_SUPPORTED
186 fprintf(stderr, " -bmp Select BMP output format (Windows style)%s\n",
187 (DEFAULT_FMT == FMT_BMP ? " (default)" : ""));
188 #endif
189 #ifdef GIF_SUPPORTED
190 fprintf(stderr, " -gif Select GIF output format%s\n",
191 (DEFAULT_FMT == FMT_GIF ? " (default)" : ""));
192 #endif
193 #ifdef BMP_SUPPORTED
194 fprintf(stderr, " -os2 Select BMP output format (OS/2 style)%s\n",
195 (DEFAULT_FMT == FMT_OS2 ? " (default)" : ""));
196 #endif
197 #ifdef PPM_SUPPORTED
198 fprintf(stderr, " -pnm Select PBMPLUS (PPM/PGM) output format%s\n",
199 (DEFAULT_FMT == FMT_PPM ? " (default)" : ""));
200 #endif
201 #ifdef RLE_SUPPORTED
202 fprintf(stderr, " -rle Select Utah RLE output format%s\n",
203 (DEFAULT_FMT == FMT_RLE ? " (default)" : ""));
204 #endif
205 #ifdef TARGA_SUPPORTED
206 fprintf(stderr, " -targa Select Targa output format%s\n",
207 (DEFAULT_FMT == FMT_TARGA ? " (default)" : ""));
208 #endif
209 fprintf(stderr, "Switches for advanced users:\n");
210 #ifdef DCT_ISLOW_SUPPORTED
211 fprintf(stderr, " -dct int Use integer DCT method%s\n",
212 (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
213 #endif
214 #ifdef DCT_IFAST_SUPPORTED
215 fprintf(stderr, " -dct fast Use fast integer DCT (less accurate)%s\n",
216 (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
217 #endif
218 #ifdef DCT_FLOAT_SUPPORTED
219 fprintf(stderr, " -dct float Use floating-point DCT method%s\n",
220 (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
221 #endif
222 fprintf(stderr, " -dither fs Use F-S dithering (default)\n");
223 fprintf(stderr, " -dither none Don't use dithering in quantization\n");
224 fprintf(stderr, " -dither ordered Use ordered dither (medium speed, quality)\n");
225 #ifdef QUANT_2PASS_SUPPORTED
226 fprintf(stderr, " -map FILE Map to colors used in named image file\n");
227 #endif
228 fprintf(stderr, " -nosmooth Don't use high-quality upsampling\n");
229 #ifdef QUANT_1PASS_SUPPORTED
230 fprintf(stderr, " -onepass Use 1-pass quantization (fast, low quality)\n");
231 #endif
232 fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n");
233 fprintf(stderr, " -outfile name Specify name for output file\n");
234 fprintf(stderr, " -verbose or -debug Emit debug output\n");
235 exit(EXIT_FAILURE);
236 }
237
238
239 LOCAL boolean
keymatch(char * arg,const char * keyword,int minchars)240 keymatch (char * arg, const char * keyword, int minchars)
241 /* Case-insensitive matching of (possibly abbreviated) keyword switches. */
242 /* keyword is the constant keyword (must be lower case already), */
243 /* minchars is length of minimum legal abbreviation. */
244 {
245 register int ca, ck;
246 register int nmatched = 0;
247
248 while ((ca = *arg++) != '\0') {
249 if ((ck = *keyword++) == '\0')
250 return FALSE; /* arg longer than keyword, no good */
251 if (isupper(ca)) /* force arg to lcase (assume ck is already) */
252 ca = tolower(ca);
253 if (ca != ck)
254 return FALSE; /* no good */
255 nmatched++; /* count matched characters */
256 }
257 /* reached end of argument; fail if it's too short for unique abbrev */
258 if (nmatched < minchars)
259 return FALSE;
260 return TRUE; /* A-OK */
261 }
262
263
264 LOCAL int
parse_switches(j_decompress_ptr cinfo,int argc,char ** argv,int last_file_arg_seen,boolean for_real)265 parse_switches (j_decompress_ptr cinfo, int argc, char **argv,
266 int last_file_arg_seen, boolean for_real)
267 /* Parse optional switches.
268 * Returns argv[] index of first file-name argument (== argc if none).
269 * Any file names with indexes <= last_file_arg_seen are ignored;
270 * they have presumably been processed in a previous iteration.
271 * (Pass 0 for last_file_arg_seen on the first or only iteration.)
272 * for_real is FALSE on the first (dummy) pass; we may skip any expensive
273 * processing.
274 */
275 {
276 int argn;
277 char * arg;
278
279 /* Set up default JPEG parameters. */
280 requested_fmt = DEFAULT_FMT; /* set default output file format */
281 outfilename = NULL;
282 cinfo->err->trace_level = 0;
283
284 /* Scan command line options, adjust parameters */
285
286 for (argn = 1; argn < argc; argn++) {
287 arg = argv[argn];
288 if (*arg != '-') {
289 /* Not a switch, must be a file name argument */
290 if (argn <= last_file_arg_seen) {
291 outfilename = NULL; /* -outfile applies to just one input file */
292 continue; /* ignore this name if previously processed */
293 }
294 break; /* else done parsing switches */
295 }
296 arg++; /* advance past switch marker character */
297
298 if (keymatch(arg, "bmp", 1)) {
299 /* BMP output format. */
300 requested_fmt = FMT_BMP;
301
302 } else if (keymatch(arg, "colors", 1) || keymatch(arg, "colours", 1) ||
303 keymatch(arg, "quantize", 1) || keymatch(arg, "quantise", 1)) {
304 /* Do color quantization. */
305 int val;
306
307 if (++argn >= argc) /* advance to next argument */
308 usage();
309 if (sscanf(argv[argn], "%d", &val) != 1)
310 usage();
311 cinfo->desired_number_of_colors = val;
312 cinfo->quantize_colors = TRUE;
313
314 } else if (keymatch(arg, "dct", 2)) {
315 /* Select IDCT algorithm. */
316 if (++argn >= argc) /* advance to next argument */
317 usage();
318 if (keymatch(argv[argn], "int", 1)) {
319 cinfo->dct_method = JDCT_ISLOW;
320 } else if (keymatch(argv[argn], "fast", 2)) {
321 cinfo->dct_method = JDCT_IFAST;
322 } else if (keymatch(argv[argn], "float", 2)) {
323 cinfo->dct_method = JDCT_FLOAT;
324 } else
325 usage();
326
327 } else if (keymatch(arg, "dither", 2)) {
328 /* Select dithering algorithm. */
329 if (++argn >= argc) /* advance to next argument */
330 usage();
331 if (keymatch(argv[argn], "fs", 2)) {
332 cinfo->dither_mode = JDITHER_FS;
333 } else if (keymatch(argv[argn], "none", 2)) {
334 cinfo->dither_mode = JDITHER_NONE;
335 } else if (keymatch(argv[argn], "ordered", 2)) {
336 cinfo->dither_mode = JDITHER_ORDERED;
337 } else
338 usage();
339
340 } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
341 /* Enable debug printouts. */
342 /* On first -d, print version identification */
343 static boolean printed_version = FALSE;
344
345 if (! printed_version) {
346 fprintf(stderr, "Independent JPEG Group's DJPEG, version %s\n%s\n",
347 JVERSION, JCOPYRIGHT);
348 printed_version = TRUE;
349 }
350 cinfo->err->trace_level++;
351
352 } else if (keymatch(arg, "fast", 1)) {
353 /* Select recommended processing options for quick-and-dirty output. */
354 cinfo->two_pass_quantize = FALSE;
355 cinfo->dither_mode = JDITHER_ORDERED;
356 if (! cinfo->quantize_colors) /* don't override an earlier -colors */
357 cinfo->desired_number_of_colors = 216;
358 cinfo->dct_method = JDCT_FASTEST;
359 cinfo->do_fancy_upsampling = FALSE;
360
361 } else if (keymatch(arg, "gif", 1)) {
362 /* GIF output format. */
363 requested_fmt = FMT_GIF;
364
365 } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
366 /* Force monochrome output. */
367 cinfo->out_color_space = JCS_GRAYSCALE;
368
369 } else if (keymatch(arg, "map", 3)) {
370 /* Quantize to a color map taken from an input file. */
371 if (++argn >= argc) /* advance to next argument */
372 usage();
373 if (for_real) { /* too expensive to do twice! */
374 #ifdef QUANT_2PASS_SUPPORTED /* otherwise can't quantize to supplied map */
375 FILE * mapfile;
376
377 if ((mapfile = fopen(argv[argn], READ_BINARY)) == NULL) {
378 fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]);
379 exit(EXIT_FAILURE);
380 }
381 read_color_map(cinfo, mapfile);
382 fclose(mapfile);
383 cinfo->quantize_colors = TRUE;
384 #else
385 ERREXIT(cinfo, JERR_NOT_COMPILED);
386 #endif
387 }
388
389 } else if (keymatch(arg, "maxmemory", 3)) {
390 /* Maximum memory in Kb (or Mb with 'm'). */
391 long lval;
392 char ch = 'x';
393
394 if (++argn >= argc) /* advance to next argument */
395 usage();
396 if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
397 usage();
398 if (ch == 'm' || ch == 'M')
399 lval *= 1000L;
400 cinfo->mem->max_memory_to_use = lval * 1000L;
401
402 } else if (keymatch(arg, "nosmooth", 3)) {
403 /* Suppress fancy upsampling */
404 cinfo->do_fancy_upsampling = FALSE;
405
406 } else if (keymatch(arg, "onepass", 3)) {
407 /* Use fast one-pass quantization. */
408 cinfo->two_pass_quantize = FALSE;
409
410 } else if (keymatch(arg, "os2", 3)) {
411 /* BMP output format (OS/2 flavor). */
412 requested_fmt = FMT_OS2;
413
414 } else if (keymatch(arg, "outfile", 4)) {
415 /* Set output file name. */
416 if (++argn >= argc) /* advance to next argument */
417 usage();
418 outfilename = argv[argn]; /* save it away for later use */
419
420 } else if (keymatch(arg, "pnm", 1) || keymatch(arg, "ppm", 1)) {
421 /* PPM/PGM output format. */
422 requested_fmt = FMT_PPM;
423
424 } else if (keymatch(arg, "rle", 1)) {
425 /* RLE output format. */
426 requested_fmt = FMT_RLE;
427
428 } else if (keymatch(arg, "scale", 1)) {
429 /* Scale the output image by a fraction M/N. */
430 if (++argn >= argc) /* advance to next argument */
431 usage();
432 if (sscanf(argv[argn], "%d/%d",
433 &cinfo->scale_num, &cinfo->scale_denom) != 2)
434 usage();
435
436 } else if (keymatch(arg, "targa", 1)) {
437 /* Targa output format. */
438 requested_fmt = FMT_TARGA;
439
440 } else {
441 usage(); /* bogus switch */
442 }
443 }
444
445 return argn; /* return index of next arg (file name) */
446 }
447
448
449 /*
450 * Marker processor for COM markers.
451 * This replaces the library's built-in processor, which just skips the marker.
452 * We want to print out the marker as text, if possible.
453 * Note this code relies on a non-suspending data source.
454 */
455
456 LOCAL unsigned int
jpeg_getc(j_decompress_ptr cinfo)457 jpeg_getc (j_decompress_ptr cinfo)
458 /* Read next byte */
459 {
460 struct jpeg_source_mgr * datasrc = cinfo->src;
461
462 if (datasrc->bytes_in_buffer == 0) {
463 if (! (*datasrc->fill_input_buffer) (cinfo))
464 ERREXIT(cinfo, JERR_CANT_SUSPEND);
465 }
466 datasrc->bytes_in_buffer--;
467 return GETJOCTET(*datasrc->next_input_byte++);
468 }
469
470
471 METHODDEF boolean
COM_handler(j_decompress_ptr cinfo)472 COM_handler (j_decompress_ptr cinfo)
473 {
474 boolean traceit = (cinfo->err->trace_level >= 1);
475 INT32 length;
476 unsigned int ch;
477 unsigned int lastch = 0;
478
479 length = jpeg_getc(cinfo) << 8;
480 length += jpeg_getc(cinfo);
481 length -= 2; /* discount the length word itself */
482
483 if (traceit)
484 fprintf(stderr, "Comment, length %ld:\n", (long) length);
485
486 while (--length >= 0) {
487 ch = jpeg_getc(cinfo);
488 if (traceit) {
489 /* Emit the character in a readable form.
490 * Nonprintables are converted to \nnn form,
491 * while \ is converted to \\.
492 * Newlines in CR, CR/LF, or LF form will be printed as one newline.
493 */
494 if (ch == '\r') {
495 fprintf(stderr, "\n");
496 } else if (ch == '\n') {
497 if (lastch != '\r')
498 fprintf(stderr, "\n");
499 } else if (ch == '\\') {
500 fprintf(stderr, "\\\\");
501 } else if (isprint(ch)) {
502 putc(ch, stderr);
503 } else {
504 fprintf(stderr, "\\%03o", ch);
505 }
506 lastch = ch;
507 }
508 }
509
510 if (traceit)
511 fprintf(stderr, "\n");
512
513 return TRUE;
514 }
515
516
517 /*
518 * The main program.
519 */
520
521 GLOBAL int
main(int argc,char ** argv)522 main (int argc, char **argv)
523 {
524 struct jpeg_decompress_struct cinfo;
525 struct jpeg_error_mgr jerr;
526 #ifdef PROGRESS_REPORT
527 struct cdjpeg_progress_mgr progress;
528 #endif
529 int file_index;
530 djpeg_dest_ptr dest_mgr = NULL;
531 FILE * input_file;
532 FILE * output_file;
533 JDIMENSION num_scanlines;
534
535 /* On Mac, fetch a command line. */
536 #ifdef USE_CCOMMAND
537 argc = ccommand(&argv);
538 #endif
539
540 progname = argv[0];
541 if (progname == NULL || progname[0] == 0)
542 progname = "djpeg"; /* in case C library doesn't provide it */
543
544 /* Initialize the JPEG decompression object with default error handling. */
545 cinfo.err = jpeg_std_error(&jerr);
546 jpeg_create_decompress(&cinfo);
547 /* Add some application-specific error messages (from cderror.h) */
548 jerr.addon_message_table = addon_message_table;
549 jerr.first_addon_message = JMSG_FIRSTADDONCODE;
550 jerr.last_addon_message = JMSG_LASTADDONCODE;
551 /* Insert custom COM marker processor. */
552 jpeg_set_marker_processor(&cinfo, JPEG_COM, COM_handler);
553
554 /* Now safe to enable signal catcher. */
555 #ifdef NEED_SIGNAL_CATCHER
556 sig_cinfo = (j_common_ptr) &cinfo;
557 signal(SIGINT, signal_catcher);
558 #ifdef SIGTERM /* not all systems have SIGTERM */
559 signal(SIGTERM, signal_catcher);
560 #endif
561 #endif
562
563 /* Scan command line to find file names. */
564 /* It is convenient to use just one switch-parsing routine, but the switch
565 * values read here are ignored; we will rescan the switches after opening
566 * the input file.
567 * (Exception: tracing level set here controls verbosity for COM markers
568 * found during jpeg_read_header...)
569 */
570
571 file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
572
573 #ifdef TWO_FILE_COMMANDLINE
574 /* Must have either -outfile switch or explicit output file name */
575 if (outfilename == NULL) {
576 if (file_index != argc-2) {
577 fprintf(stderr, "%s: must name one input and one output file\n",
578 progname);
579 usage();
580 }
581 outfilename = argv[file_index+1];
582 } else {
583 if (file_index != argc-1) {
584 fprintf(stderr, "%s: must name one input and one output file\n",
585 progname);
586 usage();
587 }
588 }
589 #else
590 /* Unix style: expect zero or one file name */
591 if (file_index < argc-1) {
592 fprintf(stderr, "%s: only one input file\n", progname);
593 usage();
594 }
595 #endif /* TWO_FILE_COMMANDLINE */
596
597 /* Open the input file. */
598 if (file_index < argc) {
599 if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
600 fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
601 exit(EXIT_FAILURE);
602 }
603 } else {
604 /* default input file is stdin */
605 #ifdef USE_SETMODE /* need to hack file mode? */
606 setmode(fileno(stdin), O_BINARY);
607 #endif
608 #ifdef USE_FDOPEN /* need to re-open in binary mode? */
609 if ((input_file = fdopen(fileno(stdin), READ_BINARY)) == NULL) {
610 fprintf(stderr, "%s: can't open stdin\n", progname);
611 exit(EXIT_FAILURE);
612 }
613 #else
614 input_file = stdin;
615 #endif
616 }
617
618 /* Open the output file. */
619 if (outfilename != NULL) {
620 if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
621 fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
622 exit(EXIT_FAILURE);
623 }
624 } else {
625 /* default output file is stdout */
626 #ifdef USE_SETMODE /* need to hack file mode? */
627 setmode(fileno(stdout), O_BINARY);
628 #endif
629 #ifdef USE_FDOPEN /* need to re-open in binary mode? */
630 if ((output_file = fdopen(fileno(stdout), WRITE_BINARY)) == NULL) {
631 fprintf(stderr, "%s: can't open stdout\n", progname);
632 exit(EXIT_FAILURE);
633 }
634 #else
635 output_file = stdout;
636 #endif
637 }
638
639 #ifdef PROGRESS_REPORT
640 /* Enable progress display, unless trace output is on */
641 if (jerr.trace_level == 0) {
642 progress.pub.progress_monitor = progress_monitor;
643 progress.completed_extra_passes = 0;
644 progress.total_extra_passes = 0;
645 progress.percent_done = -1;
646 cinfo.progress = &progress.pub;
647 }
648 #endif
649
650 /* Specify data source for decompression */
651 jpeg_stdio_src(&cinfo, input_file);
652
653 /* Read file header, set default decompression parameters */
654 (void) jpeg_read_header(&cinfo, TRUE);
655
656 /* Adjust default decompression parameters by re-parsing the options */
657 file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
658
659 /* Initialize the output module now to let it override any crucial
660 * option settings (for instance, GIF wants to force color quantization).
661 */
662 switch (requested_fmt) {
663 #ifdef BMP_SUPPORTED
664 case FMT_BMP:
665 dest_mgr = jinit_write_bmp(&cinfo, FALSE);
666 break;
667 case FMT_OS2:
668 dest_mgr = jinit_write_bmp(&cinfo, TRUE);
669 break;
670 #endif
671 #ifdef GIF_SUPPORTED
672 case FMT_GIF:
673 dest_mgr = jinit_write_gif(&cinfo);
674 break;
675 #endif
676 #ifdef PPM_SUPPORTED
677 case FMT_PPM:
678 dest_mgr = jinit_write_ppm(&cinfo);
679 break;
680 #endif
681 #ifdef RLE_SUPPORTED
682 case FMT_RLE:
683 dest_mgr = jinit_write_rle(&cinfo);
684 break;
685 #endif
686 #ifdef TARGA_SUPPORTED
687 case FMT_TARGA:
688 dest_mgr = jinit_write_targa(&cinfo);
689 break;
690 #endif
691 default:
692 ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT);
693 break;
694 }
695 dest_mgr->output_file = output_file;
696
697 /* Start decompressor */
698 jpeg_start_decompress(&cinfo);
699
700 /* Write output file header */
701 (*dest_mgr->start_output) (&cinfo, dest_mgr);
702
703 /* Process data */
704 while (cinfo.output_scanline < cinfo.output_height) {
705 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
706 dest_mgr->buffer_height);
707 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
708 }
709
710 #ifdef PROGRESS_REPORT
711 /* Hack: count final pass as done in case finish_output does an extra pass.
712 * The library won't have updated completed_passes.
713 */
714 progress.pub.completed_passes = progress.pub.total_passes;
715 #endif
716
717 /* Finish decompression and release memory.
718 * I must do it in this order because output module has allocated memory
719 * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory.
720 */
721 (*dest_mgr->finish_output) (&cinfo, dest_mgr);
722 jpeg_finish_decompress(&cinfo);
723 jpeg_destroy_decompress(&cinfo);
724
725 #ifdef PROGRESS_REPORT
726 /* Clear away progress display */
727 if (jerr.trace_level == 0) {
728 fprintf(stderr, "\r \r");
729 fflush(stderr);
730 }
731 #endif
732
733 /* All done. */
734 exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
735 return 0; /* suppress no-return-value warnings */
736 }
737