1 /*
2 * djpeg.c
3 *
4 * This file was part of the Independent JPEG Group's software:
5 * Copyright (C) 1991-1997, Thomas G. Lane.
6 * libjpeg-turbo Modifications:
7 * Copyright (C) 2010-2011, 2013-2016, D. R. Commander.
8 * Copyright (C) 2015, Google, Inc.
9 * For conditions of distribution and use, see the accompanying README file.
10 *
11 * This file contains a command-line user interface for the JPEG decompressor.
12 * It should work on any system with Unix- or MS-DOS-style command lines.
13 *
14 * Two different command line styles are permitted, depending on the
15 * compile-time switch TWO_FILE_COMMANDLINE:
16 * djpeg [options] inputfile outputfile
17 * djpeg [options] [inputfile]
18 * In the second style, output is always to standard output, which you'd
19 * normally redirect to a file or pipe to some other program. Input is
20 * either from a named file or from standard input (typically redirected).
21 * The second style is convenient on Unix but is unhelpful on systems that
22 * don't support pipes. Also, you MUST use the first style if your system
23 * doesn't do binary I/O to stdin/stdout.
24 * To simplify script writing, the "-outfile" switch is provided. The syntax
25 * djpeg [options] -outfile outputfile inputfile
26 * works regardless of which command line style is used.
27 */
28
29 #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
30 #include "jversion.h" /* for version message */
31 #include "jconfigint.h"
32 #include "wrppm.h"
33
34 #include <ctype.h> /* to declare isprint() */
35
36 #ifdef USE_CCOMMAND /* command-line reader for Macintosh */
37 #ifdef __MWERKS__
38 #include <SIOUX.h> /* Metrowerks needs this */
39 #include <console.h> /* ... and this */
40 #endif
41 #ifdef THINK_C
42 #include <console.h> /* Think declares it here */
43 #endif
44 #endif
45
46
47 /* Create the add-on message string table. */
48
49 #define JMESSAGE(code,string) string ,
50
51 static const char * const cdjpeg_message_table[] = {
52 #include "cderror.h"
53 NULL
54 };
55
56
57 /*
58 * This list defines the known output image formats
59 * (not all of which need be supported by a given version).
60 * You can change the default output format by defining DEFAULT_FMT;
61 * indeed, you had better do so if you undefine PPM_SUPPORTED.
62 */
63
64 typedef enum {
65 FMT_BMP, /* BMP format (Windows flavor) */
66 FMT_GIF, /* GIF format */
67 FMT_OS2, /* BMP format (OS/2 flavor) */
68 FMT_PPM, /* PPM/PGM (PBMPLUS formats) */
69 FMT_RLE, /* RLE format */
70 FMT_TARGA, /* Targa format */
71 FMT_TIFF /* TIFF format */
72 } IMAGE_FORMATS;
73
74 #ifndef DEFAULT_FMT /* so can override from CFLAGS in Makefile */
75 #define DEFAULT_FMT FMT_PPM
76 #endif
77
78 static IMAGE_FORMATS requested_fmt;
79
80
81 /*
82 * Argument-parsing code.
83 * The switch parser is designed to be useful with DOS-style command line
84 * syntax, ie, intermixed switches and file names, where only the switches
85 * to the left of a given file name affect processing of that file.
86 * The main program in this file doesn't actually use this capability...
87 */
88
89
90 static const char *progname; /* program name for error messages */
91 static char *outfilename; /* for -outfile switch */
92 boolean memsrc; /* for -memsrc switch */
93 boolean skip, crop;
94 JDIMENSION skip_start, skip_end;
95 JDIMENSION crop_x, crop_y, crop_width, crop_height;
96 #define INPUT_BUF_SIZE 4096
97
98
99 LOCAL(void)
usage(void)100 usage (void)
101 /* complain about bad command line */
102 {
103 fprintf(stderr, "usage: %s [switches] ", progname);
104 #ifdef TWO_FILE_COMMANDLINE
105 fprintf(stderr, "inputfile outputfile\n");
106 #else
107 fprintf(stderr, "[inputfile]\n");
108 #endif
109
110 fprintf(stderr, "Switches (names may be abbreviated):\n");
111 fprintf(stderr, " -colors N Reduce image to no more than N colors\n");
112 fprintf(stderr, " -fast Fast, low-quality processing\n");
113 fprintf(stderr, " -grayscale Force grayscale output\n");
114 fprintf(stderr, " -rgb Force RGB output\n");
115 fprintf(stderr, " -rgb565 Force RGB565 output\n");
116 #ifdef IDCT_SCALING_SUPPORTED
117 fprintf(stderr, " -scale M/N Scale output image by fraction M/N, eg, 1/8\n");
118 #endif
119 #ifdef BMP_SUPPORTED
120 fprintf(stderr, " -bmp Select BMP output format (Windows style)%s\n",
121 (DEFAULT_FMT == FMT_BMP ? " (default)" : ""));
122 #endif
123 #ifdef GIF_SUPPORTED
124 fprintf(stderr, " -gif Select GIF output format%s\n",
125 (DEFAULT_FMT == FMT_GIF ? " (default)" : ""));
126 #endif
127 #ifdef BMP_SUPPORTED
128 fprintf(stderr, " -os2 Select BMP output format (OS/2 style)%s\n",
129 (DEFAULT_FMT == FMT_OS2 ? " (default)" : ""));
130 #endif
131 #ifdef PPM_SUPPORTED
132 fprintf(stderr, " -pnm Select PBMPLUS (PPM/PGM) output format%s\n",
133 (DEFAULT_FMT == FMT_PPM ? " (default)" : ""));
134 #endif
135 #ifdef RLE_SUPPORTED
136 fprintf(stderr, " -rle Select Utah RLE output format%s\n",
137 (DEFAULT_FMT == FMT_RLE ? " (default)" : ""));
138 #endif
139 #ifdef TARGA_SUPPORTED
140 fprintf(stderr, " -targa Select Targa output format%s\n",
141 (DEFAULT_FMT == FMT_TARGA ? " (default)" : ""));
142 #endif
143 fprintf(stderr, "Switches for advanced users:\n");
144 #ifdef DCT_ISLOW_SUPPORTED
145 fprintf(stderr, " -dct int Use integer DCT method%s\n",
146 (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
147 #endif
148 #ifdef DCT_IFAST_SUPPORTED
149 fprintf(stderr, " -dct fast Use fast integer DCT (less accurate)%s\n",
150 (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
151 #endif
152 #ifdef DCT_FLOAT_SUPPORTED
153 fprintf(stderr, " -dct float Use floating-point DCT method%s\n",
154 (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
155 #endif
156 fprintf(stderr, " -dither fs Use F-S dithering (default)\n");
157 fprintf(stderr, " -dither none Don't use dithering in quantization\n");
158 fprintf(stderr, " -dither ordered Use ordered dither (medium speed, quality)\n");
159 #ifdef QUANT_2PASS_SUPPORTED
160 fprintf(stderr, " -map FILE Map to colors used in named image file\n");
161 #endif
162 fprintf(stderr, " -nosmooth Don't use high-quality upsampling\n");
163 #ifdef QUANT_1PASS_SUPPORTED
164 fprintf(stderr, " -onepass Use 1-pass quantization (fast, low quality)\n");
165 #endif
166 fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n");
167 fprintf(stderr, " -outfile name Specify name for output file\n");
168 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
169 fprintf(stderr, " -memsrc Load input file into memory before decompressing\n");
170 #endif
171
172 fprintf(stderr, " -skip Y0,Y1 Decompress all rows except those between Y0 and Y1 (inclusive)\n");
173 fprintf(stderr, " -crop WxH+X+Y Decompress only a rectangular subregion of the image\n");
174 fprintf(stderr, " -verbose or -debug Emit debug output\n");
175 fprintf(stderr, " -version Print version information and exit\n");
176 exit(EXIT_FAILURE);
177 }
178
179
180 LOCAL(int)
parse_switches(j_decompress_ptr cinfo,int argc,char ** argv,int last_file_arg_seen,boolean for_real)181 parse_switches (j_decompress_ptr cinfo, int argc, char **argv,
182 int last_file_arg_seen, boolean for_real)
183 /* Parse optional switches.
184 * Returns argv[] index of first file-name argument (== argc if none).
185 * Any file names with indexes <= last_file_arg_seen are ignored;
186 * they have presumably been processed in a previous iteration.
187 * (Pass 0 for last_file_arg_seen on the first or only iteration.)
188 * for_real is FALSE on the first (dummy) pass; we may skip any expensive
189 * processing.
190 */
191 {
192 int argn;
193 char * arg;
194
195 /* Set up default JPEG parameters. */
196 requested_fmt = DEFAULT_FMT; /* set default output file format */
197 outfilename = NULL;
198 memsrc = FALSE;
199 skip = FALSE;
200 crop = FALSE;
201 cinfo->err->trace_level = 0;
202
203 /* Scan command line options, adjust parameters */
204
205 for (argn = 1; argn < argc; argn++) {
206 arg = argv[argn];
207 if (*arg != '-') {
208 /* Not a switch, must be a file name argument */
209 if (argn <= last_file_arg_seen) {
210 outfilename = NULL; /* -outfile applies to just one input file */
211 continue; /* ignore this name if previously processed */
212 }
213 break; /* else done parsing switches */
214 }
215 arg++; /* advance past switch marker character */
216
217 if (keymatch(arg, "bmp", 1)) {
218 /* BMP output format. */
219 requested_fmt = FMT_BMP;
220
221 } else if (keymatch(arg, "colors", 1) || keymatch(arg, "colours", 1) ||
222 keymatch(arg, "quantize", 1) || keymatch(arg, "quantise", 1)) {
223 /* Do color quantization. */
224 int val;
225
226 if (++argn >= argc) /* advance to next argument */
227 usage();
228 if (sscanf(argv[argn], "%d", &val) != 1)
229 usage();
230 cinfo->desired_number_of_colors = val;
231 cinfo->quantize_colors = TRUE;
232
233 } else if (keymatch(arg, "dct", 2)) {
234 /* Select IDCT algorithm. */
235 if (++argn >= argc) /* advance to next argument */
236 usage();
237 if (keymatch(argv[argn], "int", 1)) {
238 cinfo->dct_method = JDCT_ISLOW;
239 } else if (keymatch(argv[argn], "fast", 2)) {
240 cinfo->dct_method = JDCT_IFAST;
241 } else if (keymatch(argv[argn], "float", 2)) {
242 cinfo->dct_method = JDCT_FLOAT;
243 } else
244 usage();
245
246 } else if (keymatch(arg, "dither", 2)) {
247 /* Select dithering algorithm. */
248 if (++argn >= argc) /* advance to next argument */
249 usage();
250 if (keymatch(argv[argn], "fs", 2)) {
251 cinfo->dither_mode = JDITHER_FS;
252 } else if (keymatch(argv[argn], "none", 2)) {
253 cinfo->dither_mode = JDITHER_NONE;
254 } else if (keymatch(argv[argn], "ordered", 2)) {
255 cinfo->dither_mode = JDITHER_ORDERED;
256 } else
257 usage();
258
259 } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
260 /* Enable debug printouts. */
261 /* On first -d, print version identification */
262 static boolean printed_version = FALSE;
263
264 if (! printed_version) {
265 fprintf(stderr, "%s version %s (build %s)\n",
266 PACKAGE_NAME, VERSION, BUILD);
267 fprintf(stderr, "%s\n\n", JCOPYRIGHT);
268 fprintf(stderr, "Emulating The Independent JPEG Group's software, version %s\n\n",
269 JVERSION);
270 printed_version = TRUE;
271 }
272 cinfo->err->trace_level++;
273
274 } else if (keymatch(arg, "version", 4)) {
275 fprintf(stderr, "%s version %s (build %s)\n",
276 PACKAGE_NAME, VERSION, BUILD);
277 exit(EXIT_SUCCESS);
278
279 } else if (keymatch(arg, "fast", 1)) {
280 /* Select recommended processing options for quick-and-dirty output. */
281 cinfo->two_pass_quantize = FALSE;
282 cinfo->dither_mode = JDITHER_ORDERED;
283 if (! cinfo->quantize_colors) /* don't override an earlier -colors */
284 cinfo->desired_number_of_colors = 216;
285 cinfo->dct_method = JDCT_FASTEST;
286 cinfo->do_fancy_upsampling = FALSE;
287
288 } else if (keymatch(arg, "gif", 1)) {
289 /* GIF output format. */
290 requested_fmt = FMT_GIF;
291
292 } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
293 /* Force monochrome output. */
294 cinfo->out_color_space = JCS_GRAYSCALE;
295
296 } else if (keymatch(arg, "rgb", 2)) {
297 /* Force RGB output. */
298 cinfo->out_color_space = JCS_RGB;
299
300 } else if (keymatch(arg, "rgb565", 2)) {
301 /* Force RGB565 output. */
302 cinfo->out_color_space = JCS_RGB565;
303
304 } else if (keymatch(arg, "map", 3)) {
305 /* Quantize to a color map taken from an input file. */
306 if (++argn >= argc) /* advance to next argument */
307 usage();
308 if (for_real) { /* too expensive to do twice! */
309 #ifdef QUANT_2PASS_SUPPORTED /* otherwise can't quantize to supplied map */
310 FILE * mapfile;
311
312 if ((mapfile = fopen(argv[argn], READ_BINARY)) == NULL) {
313 fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]);
314 exit(EXIT_FAILURE);
315 }
316 read_color_map(cinfo, mapfile);
317 fclose(mapfile);
318 cinfo->quantize_colors = TRUE;
319 #else
320 ERREXIT(cinfo, JERR_NOT_COMPILED);
321 #endif
322 }
323
324 } else if (keymatch(arg, "maxmemory", 3)) {
325 /* Maximum memory in Kb (or Mb with 'm'). */
326 long lval;
327 char ch = 'x';
328
329 if (++argn >= argc) /* advance to next argument */
330 usage();
331 if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
332 usage();
333 if (ch == 'm' || ch == 'M')
334 lval *= 1000L;
335 cinfo->mem->max_memory_to_use = lval * 1000L;
336
337 } else if (keymatch(arg, "nosmooth", 3)) {
338 /* Suppress fancy upsampling */
339 cinfo->do_fancy_upsampling = FALSE;
340
341 } else if (keymatch(arg, "onepass", 3)) {
342 /* Use fast one-pass quantization. */
343 cinfo->two_pass_quantize = FALSE;
344
345 } else if (keymatch(arg, "os2", 3)) {
346 /* BMP output format (OS/2 flavor). */
347 requested_fmt = FMT_OS2;
348
349 } else if (keymatch(arg, "outfile", 4)) {
350 /* Set output file name. */
351 if (++argn >= argc) /* advance to next argument */
352 usage();
353 outfilename = argv[argn]; /* save it away for later use */
354
355 } else if (keymatch(arg, "memsrc", 2)) {
356 /* Use in-memory source manager */
357 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
358 memsrc = TRUE;
359 #else
360 fprintf(stderr, "%s: sorry, in-memory source manager was not compiled in\n",
361 progname);
362 exit(EXIT_FAILURE);
363 #endif
364
365 } else if (keymatch(arg, "pnm", 1) || keymatch(arg, "ppm", 1)) {
366 /* PPM/PGM output format. */
367 requested_fmt = FMT_PPM;
368
369 } else if (keymatch(arg, "rle", 1)) {
370 /* RLE output format. */
371 requested_fmt = FMT_RLE;
372
373 } else if (keymatch(arg, "scale", 2)) {
374 /* Scale the output image by a fraction M/N. */
375 if (++argn >= argc) /* advance to next argument */
376 usage();
377 if (sscanf(argv[argn], "%d/%d",
378 &cinfo->scale_num, &cinfo->scale_denom) != 2)
379 usage();
380
381 } else if (keymatch(arg, "skip", 2)) {
382 if (++argn >= argc)
383 usage();
384 if (sscanf(argv[argn], "%u,%u", &skip_start, &skip_end) != 2 ||
385 skip_start > skip_end)
386 usage();
387 skip = TRUE;
388
389 } else if (keymatch(arg, "crop", 2)) {
390 char c;
391 if (++argn >= argc)
392 usage();
393 if (sscanf(argv[argn], "%u%c%u+%u+%u", &crop_width, &c, &crop_height,
394 &crop_x, &crop_y) != 5 ||
395 (c != 'X' && c != 'x') || crop_width < 1 || crop_height < 1)
396 usage();
397 crop = TRUE;
398
399 } else if (keymatch(arg, "targa", 1)) {
400 /* Targa output format. */
401 requested_fmt = FMT_TARGA;
402
403 } else {
404 usage(); /* bogus switch */
405 }
406 }
407
408 return argn; /* return index of next arg (file name) */
409 }
410
411
412 /*
413 * Marker processor for COM and interesting APPn markers.
414 * This replaces the library's built-in processor, which just skips the marker.
415 * We want to print out the marker as text, to the extent possible.
416 * Note this code relies on a non-suspending data source.
417 */
418
419 LOCAL(unsigned int)
jpeg_getc(j_decompress_ptr cinfo)420 jpeg_getc (j_decompress_ptr cinfo)
421 /* Read next byte */
422 {
423 struct jpeg_source_mgr * datasrc = cinfo->src;
424
425 if (datasrc->bytes_in_buffer == 0) {
426 if (! (*datasrc->fill_input_buffer) (cinfo))
427 ERREXIT(cinfo, JERR_CANT_SUSPEND);
428 }
429 datasrc->bytes_in_buffer--;
430 return GETJOCTET(*datasrc->next_input_byte++);
431 }
432
433
434 METHODDEF(boolean)
print_text_marker(j_decompress_ptr cinfo)435 print_text_marker (j_decompress_ptr cinfo)
436 {
437 boolean traceit = (cinfo->err->trace_level >= 1);
438 INT32 length;
439 unsigned int ch;
440 unsigned int lastch = 0;
441
442 length = jpeg_getc(cinfo) << 8;
443 length += jpeg_getc(cinfo);
444 length -= 2; /* discount the length word itself */
445
446 if (traceit) {
447 if (cinfo->unread_marker == JPEG_COM)
448 fprintf(stderr, "Comment, length %ld:\n", (long) length);
449 else /* assume it is an APPn otherwise */
450 fprintf(stderr, "APP%d, length %ld:\n",
451 cinfo->unread_marker - JPEG_APP0, (long) length);
452 }
453
454 while (--length >= 0) {
455 ch = jpeg_getc(cinfo);
456 if (traceit) {
457 /* Emit the character in a readable form.
458 * Nonprintables are converted to \nnn form,
459 * while \ is converted to \\.
460 * Newlines in CR, CR/LF, or LF form will be printed as one newline.
461 */
462 if (ch == '\r') {
463 fprintf(stderr, "\n");
464 } else if (ch == '\n') {
465 if (lastch != '\r')
466 fprintf(stderr, "\n");
467 } else if (ch == '\\') {
468 fprintf(stderr, "\\\\");
469 } else if (isprint(ch)) {
470 putc(ch, stderr);
471 } else {
472 fprintf(stderr, "\\%03o", ch);
473 }
474 lastch = ch;
475 }
476 }
477
478 if (traceit)
479 fprintf(stderr, "\n");
480
481 return TRUE;
482 }
483
484
485 /*
486 * The main program.
487 */
488
489 int
main(int argc,char ** argv)490 main (int argc, char **argv)
491 {
492 struct jpeg_decompress_struct cinfo;
493 struct jpeg_error_mgr jerr;
494 #ifdef PROGRESS_REPORT
495 struct cdjpeg_progress_mgr progress;
496 #endif
497 int file_index;
498 djpeg_dest_ptr dest_mgr = NULL;
499 FILE * input_file;
500 FILE * output_file;
501 unsigned char *inbuffer = NULL;
502 unsigned long insize = 0;
503 JDIMENSION num_scanlines;
504
505 /* On Mac, fetch a command line. */
506 #ifdef USE_CCOMMAND
507 argc = ccommand(&argv);
508 #endif
509
510 progname = argv[0];
511 if (progname == NULL || progname[0] == 0)
512 progname = "djpeg"; /* in case C library doesn't provide it */
513
514 /* Initialize the JPEG decompression object with default error handling. */
515 cinfo.err = jpeg_std_error(&jerr);
516 jpeg_create_decompress(&cinfo);
517 /* Add some application-specific error messages (from cderror.h) */
518 jerr.addon_message_table = cdjpeg_message_table;
519 jerr.first_addon_message = JMSG_FIRSTADDONCODE;
520 jerr.last_addon_message = JMSG_LASTADDONCODE;
521
522 /* Insert custom marker processor for COM and APP12.
523 * APP12 is used by some digital camera makers for textual info,
524 * so we provide the ability to display it as text.
525 * If you like, additional APPn marker types can be selected for display,
526 * but don't try to override APP0 or APP14 this way (see libjpeg.txt).
527 */
528 jpeg_set_marker_processor(&cinfo, JPEG_COM, print_text_marker);
529 jpeg_set_marker_processor(&cinfo, JPEG_APP0+12, print_text_marker);
530
531 /* Scan command line to find file names. */
532 /* It is convenient to use just one switch-parsing routine, but the switch
533 * values read here are ignored; we will rescan the switches after opening
534 * the input file.
535 * (Exception: tracing level set here controls verbosity for COM markers
536 * found during jpeg_read_header...)
537 */
538
539 file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
540
541 #ifdef TWO_FILE_COMMANDLINE
542 /* Must have either -outfile switch or explicit output file name */
543 if (outfilename == NULL) {
544 if (file_index != argc-2) {
545 fprintf(stderr, "%s: must name one input and one output file\n",
546 progname);
547 usage();
548 }
549 outfilename = argv[file_index+1];
550 } else {
551 if (file_index != argc-1) {
552 fprintf(stderr, "%s: must name one input and one output file\n",
553 progname);
554 usage();
555 }
556 }
557 #else
558 /* Unix style: expect zero or one file name */
559 if (file_index < argc-1) {
560 fprintf(stderr, "%s: only one input file\n", progname);
561 usage();
562 }
563 #endif /* TWO_FILE_COMMANDLINE */
564
565 /* Open the input file. */
566 if (file_index < argc) {
567 if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
568 fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
569 exit(EXIT_FAILURE);
570 }
571 } else {
572 /* default input file is stdin */
573 input_file = read_stdin();
574 }
575
576 /* Open the output file. */
577 if (outfilename != NULL) {
578 if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
579 fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
580 exit(EXIT_FAILURE);
581 }
582 } else {
583 /* default output file is stdout */
584 output_file = write_stdout();
585 }
586
587 #ifdef PROGRESS_REPORT
588 start_progress_monitor((j_common_ptr) &cinfo, &progress);
589 #endif
590
591 /* Specify data source for decompression */
592 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
593 if (memsrc) {
594 size_t nbytes;
595 do {
596 inbuffer = (unsigned char *)realloc(inbuffer, insize + INPUT_BUF_SIZE);
597 if (inbuffer == NULL) {
598 fprintf(stderr, "%s: memory allocation failure\n", progname);
599 exit(EXIT_FAILURE);
600 }
601 nbytes = JFREAD(input_file, &inbuffer[insize], INPUT_BUF_SIZE);
602 if (nbytes < INPUT_BUF_SIZE && ferror(input_file)) {
603 if (file_index < argc)
604 fprintf(stderr, "%s: can't read from %s\n", progname,
605 argv[file_index]);
606 else
607 fprintf(stderr, "%s: can't read from stdin\n", progname);
608 }
609 insize += (unsigned long)nbytes;
610 } while (nbytes == INPUT_BUF_SIZE);
611 fprintf(stderr, "Compressed size: %lu bytes\n", insize);
612 jpeg_mem_src(&cinfo, inbuffer, insize);
613 } else
614 #endif
615 jpeg_stdio_src(&cinfo, input_file);
616
617 /* Read file header, set default decompression parameters */
618 (void) jpeg_read_header(&cinfo, TRUE);
619
620 /* Adjust default decompression parameters by re-parsing the options */
621 file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
622
623 /* Initialize the output module now to let it override any crucial
624 * option settings (for instance, GIF wants to force color quantization).
625 */
626 switch (requested_fmt) {
627 #ifdef BMP_SUPPORTED
628 case FMT_BMP:
629 dest_mgr = jinit_write_bmp(&cinfo, FALSE);
630 break;
631 case FMT_OS2:
632 dest_mgr = jinit_write_bmp(&cinfo, TRUE);
633 break;
634 #endif
635 #ifdef GIF_SUPPORTED
636 case FMT_GIF:
637 dest_mgr = jinit_write_gif(&cinfo);
638 break;
639 #endif
640 #ifdef PPM_SUPPORTED
641 case FMT_PPM:
642 dest_mgr = jinit_write_ppm(&cinfo);
643 break;
644 #endif
645 #ifdef RLE_SUPPORTED
646 case FMT_RLE:
647 dest_mgr = jinit_write_rle(&cinfo);
648 break;
649 #endif
650 #ifdef TARGA_SUPPORTED
651 case FMT_TARGA:
652 dest_mgr = jinit_write_targa(&cinfo);
653 break;
654 #endif
655 default:
656 ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT);
657 break;
658 }
659 dest_mgr->output_file = output_file;
660
661 /* Start decompressor */
662 (void) jpeg_start_decompress(&cinfo);
663
664 /* Skip rows */
665 if (skip) {
666 JDIMENSION tmp;
667
668 /* Check for valid skip_end. We cannot check this value until after
669 * jpeg_start_decompress() is called. Note that we have already verified
670 * that skip_start <= skip_end.
671 */
672 if (skip_end > cinfo.output_height - 1) {
673 fprintf(stderr, "%s: skip region exceeds image height %d\n", progname,
674 cinfo.output_height);
675 exit(EXIT_FAILURE);
676 }
677
678 /* Write output file header. This is a hack to ensure that the destination
679 * manager creates an output image of the proper size.
680 */
681 tmp = cinfo.output_height;
682 cinfo.output_height -= (skip_end - skip_start + 1);
683 (*dest_mgr->start_output) (&cinfo, dest_mgr);
684 cinfo.output_height = tmp;
685
686 /* Process data */
687 while (cinfo.output_scanline < skip_start) {
688 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
689 dest_mgr->buffer_height);
690 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
691 }
692 jpeg_skip_scanlines(&cinfo, skip_end - skip_start + 1);
693 while (cinfo.output_scanline < cinfo.output_height) {
694 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
695 dest_mgr->buffer_height);
696 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
697 }
698
699 /* Decompress a subregion */
700 } else if (crop) {
701 JDIMENSION tmp;
702
703 /* Check for valid crop dimensions. We cannot check these values until
704 * after jpeg_start_decompress() is called.
705 */
706 if (crop_x + crop_width > cinfo.output_width ||
707 crop_y + crop_height > cinfo.output_height) {
708 fprintf(stderr, "%s: crop dimensions exceed image dimensions %d x %d\n",
709 progname, cinfo.output_width, cinfo.output_height);
710 exit(EXIT_FAILURE);
711 }
712
713 jpeg_crop_scanline(&cinfo, &crop_x, &crop_width);
714 ((ppm_dest_ptr) dest_mgr)->buffer_width = cinfo.output_width *
715 cinfo.out_color_components *
716 sizeof(JSAMPLE);
717
718 /* Write output file header. This is a hack to ensure that the destination
719 * manager creates an output image of the proper size.
720 */
721 tmp = cinfo.output_height;
722 cinfo.output_height = crop_height;
723 (*dest_mgr->start_output) (&cinfo, dest_mgr);
724 cinfo.output_height = tmp;
725
726 /* Process data */
727 jpeg_skip_scanlines(&cinfo, crop_y);
728 while (cinfo.output_scanline < crop_y + crop_height) {
729 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
730 dest_mgr->buffer_height);
731 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
732 }
733 jpeg_skip_scanlines(&cinfo, cinfo.output_height - crop_y - crop_height);
734
735 /* Normal full-image decompress */
736 } else {
737 /* Write output file header */
738 (*dest_mgr->start_output) (&cinfo, dest_mgr);
739
740 /* Process data */
741 while (cinfo.output_scanline < cinfo.output_height) {
742 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
743 dest_mgr->buffer_height);
744 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
745 }
746 }
747
748 #ifdef PROGRESS_REPORT
749 /* Hack: count final pass as done in case finish_output does an extra pass.
750 * The library won't have updated completed_passes.
751 */
752 progress.pub.completed_passes = progress.pub.total_passes;
753 #endif
754
755 /* Finish decompression and release memory.
756 * I must do it in this order because output module has allocated memory
757 * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory.
758 */
759 (*dest_mgr->finish_output) (&cinfo, dest_mgr);
760 (void) jpeg_finish_decompress(&cinfo);
761 jpeg_destroy_decompress(&cinfo);
762
763 /* Close files, if we opened them */
764 if (input_file != stdin)
765 fclose(input_file);
766 if (output_file != stdout)
767 fclose(output_file);
768
769 #ifdef PROGRESS_REPORT
770 end_progress_monitor((j_common_ptr) &cinfo);
771 #endif
772
773 if (memsrc && inbuffer != NULL)
774 free(inbuffer);
775
776 /* All done. */
777 exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
778 return 0; /* suppress no-return-value warnings */
779 }
780