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 * Modified 2013 by Guido Vollbeding.
7 * libjpeg-turbo Modifications:
8 * Copyright (C) 2010-2011, 2013-2016, D. R. Commander.
9 * Copyright (C) 2015, Google, Inc.
10 * For conditions of distribution and use, see the accompanying README.ijg
11 * file.
12 *
13 * This file contains a command-line user interface for the JPEG decompressor.
14 * It should work on any system with Unix- or MS-DOS-style command lines.
15 *
16 * Two different command line styles are permitted, depending on the
17 * compile-time switch TWO_FILE_COMMANDLINE:
18 * djpeg [options] inputfile outputfile
19 * djpeg [options] [inputfile]
20 * In the second style, output is always to standard output, which you'd
21 * normally redirect to a file or pipe to some other program. Input is
22 * either from a named file or from standard input (typically redirected).
23 * The second style is convenient on Unix but is unhelpful on systems that
24 * don't support pipes. Also, you MUST use the first style if your system
25 * doesn't do binary I/O to stdin/stdout.
26 * To simplify script writing, the "-outfile" switch is provided. The syntax
27 * djpeg [options] -outfile outputfile inputfile
28 * works regardless of which command line style is used.
29 */
30
31 #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
32 #include "jversion.h" /* for version message */
33 #include "jconfigint.h"
34 #include "wrppm.h"
35
36 #include <ctype.h> /* to declare isprint() */
37
38 #ifdef USE_CCOMMAND /* command-line reader for Macintosh */
39 #ifdef __MWERKS__
40 #include <SIOUX.h> /* Metrowerks needs this */
41 #include <console.h> /* ... and this */
42 #endif
43 #ifdef THINK_C
44 #include <console.h> /* Think declares it here */
45 #endif
46 #endif
47
48
49 /* Create the add-on message string table. */
50
51 #define JMESSAGE(code,string) string ,
52
53 static const char * const cdjpeg_message_table[] = {
54 #include "cderror.h"
55 NULL
56 };
57
58
59 /*
60 * This list defines the known output image formats
61 * (not all of which need be supported by a given version).
62 * You can change the default output format by defining DEFAULT_FMT;
63 * indeed, you had better do so if you undefine PPM_SUPPORTED.
64 */
65
66 typedef enum {
67 FMT_BMP, /* BMP format (Windows flavor) */
68 FMT_GIF, /* GIF format */
69 FMT_OS2, /* BMP format (OS/2 flavor) */
70 FMT_PPM, /* PPM/PGM (PBMPLUS formats) */
71 FMT_RLE, /* RLE format */
72 FMT_TARGA, /* Targa format */
73 FMT_TIFF /* TIFF format */
74 } IMAGE_FORMATS;
75
76 #ifndef DEFAULT_FMT /* so can override from CFLAGS in Makefile */
77 #define DEFAULT_FMT FMT_PPM
78 #endif
79
80 static IMAGE_FORMATS requested_fmt;
81
82
83 /*
84 * Argument-parsing code.
85 * The switch parser is designed to be useful with DOS-style command line
86 * syntax, ie, intermixed switches and file names, where only the switches
87 * to the left of a given file name affect processing of that file.
88 * The main program in this file doesn't actually use this capability...
89 */
90
91
92 static const char *progname; /* program name for error messages */
93 static char *outfilename; /* for -outfile switch */
94 boolean memsrc; /* for -memsrc switch */
95 boolean skip, crop;
96 JDIMENSION skip_start, skip_end;
97 JDIMENSION crop_x, crop_y, crop_width, crop_height;
98 #define INPUT_BUF_SIZE 4096
99
100
101 LOCAL(void)
usage(void)102 usage (void)
103 /* complain about bad command line */
104 {
105 fprintf(stderr, "usage: %s [switches] ", progname);
106 #ifdef TWO_FILE_COMMANDLINE
107 fprintf(stderr, "inputfile outputfile\n");
108 #else
109 fprintf(stderr, "[inputfile]\n");
110 #endif
111
112 fprintf(stderr, "Switches (names may be abbreviated):\n");
113 fprintf(stderr, " -colors N Reduce image to no more than N colors\n");
114 fprintf(stderr, " -fast Fast, low-quality processing\n");
115 fprintf(stderr, " -grayscale Force grayscale output\n");
116 fprintf(stderr, " -rgb Force RGB output\n");
117 fprintf(stderr, " -rgb565 Force RGB565 output\n");
118 #ifdef IDCT_SCALING_SUPPORTED
119 fprintf(stderr, " -scale M/N Scale output image by fraction M/N, eg, 1/8\n");
120 #endif
121 #ifdef BMP_SUPPORTED
122 fprintf(stderr, " -bmp Select BMP output format (Windows style)%s\n",
123 (DEFAULT_FMT == FMT_BMP ? " (default)" : ""));
124 #endif
125 #ifdef GIF_SUPPORTED
126 fprintf(stderr, " -gif Select GIF output format%s\n",
127 (DEFAULT_FMT == FMT_GIF ? " (default)" : ""));
128 #endif
129 #ifdef BMP_SUPPORTED
130 fprintf(stderr, " -os2 Select BMP output format (OS/2 style)%s\n",
131 (DEFAULT_FMT == FMT_OS2 ? " (default)" : ""));
132 #endif
133 #ifdef PPM_SUPPORTED
134 fprintf(stderr, " -pnm Select PBMPLUS (PPM/PGM) output format%s\n",
135 (DEFAULT_FMT == FMT_PPM ? " (default)" : ""));
136 #endif
137 #ifdef RLE_SUPPORTED
138 fprintf(stderr, " -rle Select Utah RLE output format%s\n",
139 (DEFAULT_FMT == FMT_RLE ? " (default)" : ""));
140 #endif
141 #ifdef TARGA_SUPPORTED
142 fprintf(stderr, " -targa Select Targa output format%s\n",
143 (DEFAULT_FMT == FMT_TARGA ? " (default)" : ""));
144 #endif
145 fprintf(stderr, "Switches for advanced users:\n");
146 #ifdef DCT_ISLOW_SUPPORTED
147 fprintf(stderr, " -dct int Use integer DCT method%s\n",
148 (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
149 #endif
150 #ifdef DCT_IFAST_SUPPORTED
151 fprintf(stderr, " -dct fast Use fast integer DCT (less accurate)%s\n",
152 (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
153 #endif
154 #ifdef DCT_FLOAT_SUPPORTED
155 fprintf(stderr, " -dct float Use floating-point DCT method%s\n",
156 (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
157 #endif
158 fprintf(stderr, " -dither fs Use F-S dithering (default)\n");
159 fprintf(stderr, " -dither none Don't use dithering in quantization\n");
160 fprintf(stderr, " -dither ordered Use ordered dither (medium speed, quality)\n");
161 #ifdef QUANT_2PASS_SUPPORTED
162 fprintf(stderr, " -map FILE Map to colors used in named image file\n");
163 #endif
164 fprintf(stderr, " -nosmooth Don't use high-quality upsampling\n");
165 #ifdef QUANT_1PASS_SUPPORTED
166 fprintf(stderr, " -onepass Use 1-pass quantization (fast, low quality)\n");
167 #endif
168 fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n");
169 fprintf(stderr, " -outfile name Specify name for output file\n");
170 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
171 fprintf(stderr, " -memsrc Load input file into memory before decompressing\n");
172 #endif
173
174 fprintf(stderr, " -skip Y0,Y1 Decompress all rows except those between Y0 and Y1 (inclusive)\n");
175 fprintf(stderr, " -crop WxH+X+Y Decompress only a rectangular subregion of the image\n");
176 fprintf(stderr, " -verbose or -debug Emit debug output\n");
177 fprintf(stderr, " -version Print version information and exit\n");
178 exit(EXIT_FAILURE);
179 }
180
181
182 LOCAL(int)
parse_switches(j_decompress_ptr cinfo,int argc,char ** argv,int last_file_arg_seen,boolean for_real)183 parse_switches (j_decompress_ptr cinfo, int argc, char **argv,
184 int last_file_arg_seen, boolean for_real)
185 /* Parse optional switches.
186 * Returns argv[] index of first file-name argument (== argc if none).
187 * Any file names with indexes <= last_file_arg_seen are ignored;
188 * they have presumably been processed in a previous iteration.
189 * (Pass 0 for last_file_arg_seen on the first or only iteration.)
190 * for_real is FALSE on the first (dummy) pass; we may skip any expensive
191 * processing.
192 */
193 {
194 int argn;
195 char *arg;
196
197 /* Set up default JPEG parameters. */
198 requested_fmt = DEFAULT_FMT; /* set default output file format */
199 outfilename = NULL;
200 memsrc = FALSE;
201 skip = FALSE;
202 crop = FALSE;
203 cinfo->err->trace_level = 0;
204
205 /* Scan command line options, adjust parameters */
206
207 for (argn = 1; argn < argc; argn++) {
208 arg = argv[argn];
209 if (*arg != '-') {
210 /* Not a switch, must be a file name argument */
211 if (argn <= last_file_arg_seen) {
212 outfilename = NULL; /* -outfile applies to just one input file */
213 continue; /* ignore this name if previously processed */
214 }
215 break; /* else done parsing switches */
216 }
217 arg++; /* advance past switch marker character */
218
219 if (keymatch(arg, "bmp", 1)) {
220 /* BMP output format. */
221 requested_fmt = FMT_BMP;
222
223 } else if (keymatch(arg, "colors", 1) || keymatch(arg, "colours", 1) ||
224 keymatch(arg, "quantize", 1) || keymatch(arg, "quantise", 1)) {
225 /* Do color quantization. */
226 int val;
227
228 if (++argn >= argc) /* advance to next argument */
229 usage();
230 if (sscanf(argv[argn], "%d", &val) != 1)
231 usage();
232 cinfo->desired_number_of_colors = val;
233 cinfo->quantize_colors = TRUE;
234
235 } else if (keymatch(arg, "dct", 2)) {
236 /* Select IDCT algorithm. */
237 if (++argn >= argc) /* advance to next argument */
238 usage();
239 if (keymatch(argv[argn], "int", 1)) {
240 cinfo->dct_method = JDCT_ISLOW;
241 } else if (keymatch(argv[argn], "fast", 2)) {
242 cinfo->dct_method = JDCT_IFAST;
243 } else if (keymatch(argv[argn], "float", 2)) {
244 cinfo->dct_method = JDCT_FLOAT;
245 } else
246 usage();
247
248 } else if (keymatch(arg, "dither", 2)) {
249 /* Select dithering algorithm. */
250 if (++argn >= argc) /* advance to next argument */
251 usage();
252 if (keymatch(argv[argn], "fs", 2)) {
253 cinfo->dither_mode = JDITHER_FS;
254 } else if (keymatch(argv[argn], "none", 2)) {
255 cinfo->dither_mode = JDITHER_NONE;
256 } else if (keymatch(argv[argn], "ordered", 2)) {
257 cinfo->dither_mode = JDITHER_ORDERED;
258 } else
259 usage();
260
261 } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
262 /* Enable debug printouts. */
263 /* On first -d, print version identification */
264 static boolean printed_version = FALSE;
265
266 if (! printed_version) {
267 fprintf(stderr, "%s version %s (build %s)\n",
268 PACKAGE_NAME, VERSION, BUILD);
269 fprintf(stderr, "%s\n\n", JCOPYRIGHT);
270 fprintf(stderr, "Emulating The Independent JPEG Group's software, version %s\n\n",
271 JVERSION);
272 printed_version = TRUE;
273 }
274 cinfo->err->trace_level++;
275
276 } else if (keymatch(arg, "version", 4)) {
277 fprintf(stderr, "%s version %s (build %s)\n",
278 PACKAGE_NAME, VERSION, BUILD);
279 exit(EXIT_SUCCESS);
280
281 } else if (keymatch(arg, "fast", 1)) {
282 /* Select recommended processing options for quick-and-dirty output. */
283 cinfo->two_pass_quantize = FALSE;
284 cinfo->dither_mode = JDITHER_ORDERED;
285 if (! cinfo->quantize_colors) /* don't override an earlier -colors */
286 cinfo->desired_number_of_colors = 216;
287 cinfo->dct_method = JDCT_FASTEST;
288 cinfo->do_fancy_upsampling = FALSE;
289
290 } else if (keymatch(arg, "gif", 1)) {
291 /* GIF output format. */
292 requested_fmt = FMT_GIF;
293
294 } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
295 /* Force monochrome output. */
296 cinfo->out_color_space = JCS_GRAYSCALE;
297
298 } else if (keymatch(arg, "rgb", 2)) {
299 /* Force RGB output. */
300 cinfo->out_color_space = JCS_RGB;
301
302 } else if (keymatch(arg, "rgb565", 2)) {
303 /* Force RGB565 output. */
304 cinfo->out_color_space = JCS_RGB565;
305
306 } else if (keymatch(arg, "map", 3)) {
307 /* Quantize to a color map taken from an input file. */
308 if (++argn >= argc) /* advance to next argument */
309 usage();
310 if (for_real) { /* too expensive to do twice! */
311 #ifdef QUANT_2PASS_SUPPORTED /* otherwise can't quantize to supplied map */
312 FILE *mapfile;
313
314 if ((mapfile = fopen(argv[argn], READ_BINARY)) == NULL) {
315 fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]);
316 exit(EXIT_FAILURE);
317 }
318 read_color_map(cinfo, mapfile);
319 fclose(mapfile);
320 cinfo->quantize_colors = TRUE;
321 #else
322 ERREXIT(cinfo, JERR_NOT_COMPILED);
323 #endif
324 }
325
326 } else if (keymatch(arg, "maxmemory", 3)) {
327 /* Maximum memory in Kb (or Mb with 'm'). */
328 long lval;
329 char ch = 'x';
330
331 if (++argn >= argc) /* advance to next argument */
332 usage();
333 if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
334 usage();
335 if (ch == 'm' || ch == 'M')
336 lval *= 1000L;
337 cinfo->mem->max_memory_to_use = lval * 1000L;
338
339 } else if (keymatch(arg, "nosmooth", 3)) {
340 /* Suppress fancy upsampling */
341 cinfo->do_fancy_upsampling = FALSE;
342
343 } else if (keymatch(arg, "onepass", 3)) {
344 /* Use fast one-pass quantization. */
345 cinfo->two_pass_quantize = FALSE;
346
347 } else if (keymatch(arg, "os2", 3)) {
348 /* BMP output format (OS/2 flavor). */
349 requested_fmt = FMT_OS2;
350
351 } else if (keymatch(arg, "outfile", 4)) {
352 /* Set output file name. */
353 if (++argn >= argc) /* advance to next argument */
354 usage();
355 outfilename = argv[argn]; /* save it away for later use */
356
357 } else if (keymatch(arg, "memsrc", 2)) {
358 /* Use in-memory source manager */
359 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
360 memsrc = TRUE;
361 #else
362 fprintf(stderr, "%s: sorry, in-memory source manager was not compiled in\n",
363 progname);
364 exit(EXIT_FAILURE);
365 #endif
366
367 } else if (keymatch(arg, "pnm", 1) || keymatch(arg, "ppm", 1)) {
368 /* PPM/PGM output format. */
369 requested_fmt = FMT_PPM;
370
371 } else if (keymatch(arg, "rle", 1)) {
372 /* RLE output format. */
373 requested_fmt = FMT_RLE;
374
375 } else if (keymatch(arg, "scale", 2)) {
376 /* Scale the output image by a fraction M/N. */
377 if (++argn >= argc) /* advance to next argument */
378 usage();
379 if (sscanf(argv[argn], "%u/%u",
380 &cinfo->scale_num, &cinfo->scale_denom) != 2)
381 usage();
382
383 } else if (keymatch(arg, "skip", 2)) {
384 if (++argn >= argc)
385 usage();
386 if (sscanf(argv[argn], "%u,%u", &skip_start, &skip_end) != 2 ||
387 skip_start > skip_end)
388 usage();
389 skip = TRUE;
390
391 } else if (keymatch(arg, "crop", 2)) {
392 char c;
393 if (++argn >= argc)
394 usage();
395 if (sscanf(argv[argn], "%u%c%u+%u+%u", &crop_width, &c, &crop_height,
396 &crop_x, &crop_y) != 5 ||
397 (c != 'X' && c != 'x') || crop_width < 1 || crop_height < 1)
398 usage();
399 crop = TRUE;
400
401 } else if (keymatch(arg, "targa", 1)) {
402 /* Targa output format. */
403 requested_fmt = FMT_TARGA;
404
405 } else {
406 usage(); /* bogus switch */
407 }
408 }
409
410 return argn; /* return index of next arg (file name) */
411 }
412
413
414 /*
415 * Marker processor for COM and interesting APPn markers.
416 * This replaces the library's built-in processor, which just skips the marker.
417 * We want to print out the marker as text, to the extent possible.
418 * Note this code relies on a non-suspending data source.
419 */
420
421 LOCAL(unsigned int)
jpeg_getc(j_decompress_ptr cinfo)422 jpeg_getc (j_decompress_ptr cinfo)
423 /* Read next byte */
424 {
425 struct jpeg_source_mgr *datasrc = cinfo->src;
426
427 if (datasrc->bytes_in_buffer == 0) {
428 if (! (*datasrc->fill_input_buffer) (cinfo))
429 ERREXIT(cinfo, JERR_CANT_SUSPEND);
430 }
431 datasrc->bytes_in_buffer--;
432 return GETJOCTET(*datasrc->next_input_byte++);
433 }
434
435
436 METHODDEF(boolean)
print_text_marker(j_decompress_ptr cinfo)437 print_text_marker (j_decompress_ptr cinfo)
438 {
439 boolean traceit = (cinfo->err->trace_level >= 1);
440 long length;
441 unsigned int ch;
442 unsigned int lastch = 0;
443
444 length = jpeg_getc(cinfo) << 8;
445 length += jpeg_getc(cinfo);
446 length -= 2; /* discount the length word itself */
447
448 if (traceit) {
449 if (cinfo->unread_marker == JPEG_COM)
450 fprintf(stderr, "Comment, length %ld:\n", (long) length);
451 else /* assume it is an APPn otherwise */
452 fprintf(stderr, "APP%d, length %ld:\n",
453 cinfo->unread_marker - JPEG_APP0, (long) length);
454 }
455
456 while (--length >= 0) {
457 ch = jpeg_getc(cinfo);
458 if (traceit) {
459 /* Emit the character in a readable form.
460 * Nonprintables are converted to \nnn form,
461 * while \ is converted to \\.
462 * Newlines in CR, CR/LF, or LF form will be printed as one newline.
463 */
464 if (ch == '\r') {
465 fprintf(stderr, "\n");
466 } else if (ch == '\n') {
467 if (lastch != '\r')
468 fprintf(stderr, "\n");
469 } else if (ch == '\\') {
470 fprintf(stderr, "\\\\");
471 } else if (isprint(ch)) {
472 putc(ch, stderr);
473 } else {
474 fprintf(stderr, "\\%03o", ch);
475 }
476 lastch = ch;
477 }
478 }
479
480 if (traceit)
481 fprintf(stderr, "\n");
482
483 return TRUE;
484 }
485
486
487 /*
488 * The main program.
489 */
490
491 int
main(int argc,char ** argv)492 main (int argc, char **argv)
493 {
494 struct jpeg_decompress_struct cinfo;
495 struct jpeg_error_mgr jerr;
496 #ifdef PROGRESS_REPORT
497 struct cdjpeg_progress_mgr progress;
498 #endif
499 int file_index;
500 djpeg_dest_ptr dest_mgr = NULL;
501 FILE *input_file;
502 FILE *output_file;
503 unsigned char *inbuffer = NULL;
504 unsigned long insize = 0;
505 JDIMENSION num_scanlines;
506
507 /* On Mac, fetch a command line. */
508 #ifdef USE_CCOMMAND
509 argc = ccommand(&argv);
510 #endif
511
512 progname = argv[0];
513 if (progname == NULL || progname[0] == 0)
514 progname = "djpeg"; /* in case C library doesn't provide it */
515
516 /* Initialize the JPEG decompression object with default error handling. */
517 cinfo.err = jpeg_std_error(&jerr);
518 jpeg_create_decompress(&cinfo);
519 /* Add some application-specific error messages (from cderror.h) */
520 jerr.addon_message_table = cdjpeg_message_table;
521 jerr.first_addon_message = JMSG_FIRSTADDONCODE;
522 jerr.last_addon_message = JMSG_LASTADDONCODE;
523
524 /* Insert custom marker processor for COM and APP12.
525 * APP12 is used by some digital camera makers for textual info,
526 * so we provide the ability to display it as text.
527 * If you like, additional APPn marker types can be selected for display,
528 * but don't try to override APP0 or APP14 this way (see libjpeg.txt).
529 */
530 jpeg_set_marker_processor(&cinfo, JPEG_COM, print_text_marker);
531 jpeg_set_marker_processor(&cinfo, JPEG_APP0+12, print_text_marker);
532
533 /* Scan command line to find file names. */
534 /* It is convenient to use just one switch-parsing routine, but the switch
535 * values read here are ignored; we will rescan the switches after opening
536 * the input file.
537 * (Exception: tracing level set here controls verbosity for COM markers
538 * found during jpeg_read_header...)
539 */
540
541 file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
542
543 #ifdef TWO_FILE_COMMANDLINE
544 /* Must have either -outfile switch or explicit output file name */
545 if (outfilename == NULL) {
546 if (file_index != argc-2) {
547 fprintf(stderr, "%s: must name one input and one output file\n",
548 progname);
549 usage();
550 }
551 outfilename = argv[file_index+1];
552 } else {
553 if (file_index != argc-1) {
554 fprintf(stderr, "%s: must name one input and one output file\n",
555 progname);
556 usage();
557 }
558 }
559 #else
560 /* Unix style: expect zero or one file name */
561 if (file_index < argc-1) {
562 fprintf(stderr, "%s: only one input file\n", progname);
563 usage();
564 }
565 #endif /* TWO_FILE_COMMANDLINE */
566
567 /* Open the input file. */
568 if (file_index < argc) {
569 if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
570 fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
571 exit(EXIT_FAILURE);
572 }
573 } else {
574 /* default input file is stdin */
575 input_file = read_stdin();
576 }
577
578 /* Open the output file. */
579 if (outfilename != NULL) {
580 if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
581 fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
582 exit(EXIT_FAILURE);
583 }
584 } else {
585 /* default output file is stdout */
586 output_file = write_stdout();
587 }
588
589 #ifdef PROGRESS_REPORT
590 start_progress_monitor((j_common_ptr) &cinfo, &progress);
591 #endif
592
593 /* Specify data source for decompression */
594 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
595 if (memsrc) {
596 size_t nbytes;
597 do {
598 inbuffer = (unsigned char *)realloc(inbuffer, insize + INPUT_BUF_SIZE);
599 if (inbuffer == NULL) {
600 fprintf(stderr, "%s: memory allocation failure\n", progname);
601 exit(EXIT_FAILURE);
602 }
603 nbytes = JFREAD(input_file, &inbuffer[insize], INPUT_BUF_SIZE);
604 if (nbytes < INPUT_BUF_SIZE && ferror(input_file)) {
605 if (file_index < argc)
606 fprintf(stderr, "%s: can't read from %s\n", progname,
607 argv[file_index]);
608 else
609 fprintf(stderr, "%s: can't read from stdin\n", progname);
610 }
611 insize += (unsigned long)nbytes;
612 } while (nbytes == INPUT_BUF_SIZE);
613 fprintf(stderr, "Compressed size: %lu bytes\n", insize);
614 jpeg_mem_src(&cinfo, inbuffer, insize);
615 } else
616 #endif
617 jpeg_stdio_src(&cinfo, input_file);
618
619 /* Read file header, set default decompression parameters */
620 (void) jpeg_read_header(&cinfo, TRUE);
621
622 /* Adjust default decompression parameters by re-parsing the options */
623 file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
624
625 /* Initialize the output module now to let it override any crucial
626 * option settings (for instance, GIF wants to force color quantization).
627 */
628 switch (requested_fmt) {
629 #ifdef BMP_SUPPORTED
630 case FMT_BMP:
631 dest_mgr = jinit_write_bmp(&cinfo, FALSE);
632 break;
633 case FMT_OS2:
634 dest_mgr = jinit_write_bmp(&cinfo, TRUE);
635 break;
636 #endif
637 #ifdef GIF_SUPPORTED
638 case FMT_GIF:
639 dest_mgr = jinit_write_gif(&cinfo);
640 break;
641 #endif
642 #ifdef PPM_SUPPORTED
643 case FMT_PPM:
644 dest_mgr = jinit_write_ppm(&cinfo);
645 break;
646 #endif
647 #ifdef RLE_SUPPORTED
648 case FMT_RLE:
649 dest_mgr = jinit_write_rle(&cinfo);
650 break;
651 #endif
652 #ifdef TARGA_SUPPORTED
653 case FMT_TARGA:
654 dest_mgr = jinit_write_targa(&cinfo);
655 break;
656 #endif
657 default:
658 ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT);
659 break;
660 }
661 dest_mgr->output_file = output_file;
662
663 /* Start decompressor */
664 (void) jpeg_start_decompress(&cinfo);
665
666 /* Skip rows */
667 if (skip) {
668 JDIMENSION tmp;
669
670 /* Check for valid skip_end. We cannot check this value until after
671 * jpeg_start_decompress() is called. Note that we have already verified
672 * that skip_start <= skip_end.
673 */
674 if (skip_end > cinfo.output_height - 1) {
675 fprintf(stderr, "%s: skip region exceeds image height %d\n", progname,
676 cinfo.output_height);
677 exit(EXIT_FAILURE);
678 }
679
680 /* Write output file header. This is a hack to ensure that the destination
681 * manager creates an output image of the proper size.
682 */
683 tmp = cinfo.output_height;
684 cinfo.output_height -= (skip_end - skip_start + 1);
685 (*dest_mgr->start_output) (&cinfo, dest_mgr);
686 cinfo.output_height = tmp;
687
688 /* Process data */
689 while (cinfo.output_scanline < skip_start) {
690 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
691 dest_mgr->buffer_height);
692 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
693 }
694 jpeg_skip_scanlines(&cinfo, skip_end - skip_start + 1);
695 while (cinfo.output_scanline < cinfo.output_height) {
696 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
697 dest_mgr->buffer_height);
698 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
699 }
700
701 /* Decompress a subregion */
702 } else if (crop) {
703 JDIMENSION tmp;
704
705 /* Check for valid crop dimensions. We cannot check these values until
706 * after jpeg_start_decompress() is called.
707 */
708 if (crop_x + crop_width > cinfo.output_width ||
709 crop_y + crop_height > cinfo.output_height) {
710 fprintf(stderr, "%s: crop dimensions exceed image dimensions %d x %d\n",
711 progname, cinfo.output_width, cinfo.output_height);
712 exit(EXIT_FAILURE);
713 }
714
715 jpeg_crop_scanline(&cinfo, &crop_x, &crop_width);
716 ((ppm_dest_ptr) dest_mgr)->buffer_width = cinfo.output_width *
717 cinfo.out_color_components *
718 sizeof(JSAMPLE);
719
720 /* Write output file header. This is a hack to ensure that the destination
721 * manager creates an output image of the proper size.
722 */
723 tmp = cinfo.output_height;
724 cinfo.output_height = crop_height;
725 (*dest_mgr->start_output) (&cinfo, dest_mgr);
726 cinfo.output_height = tmp;
727
728 /* Process data */
729 jpeg_skip_scanlines(&cinfo, crop_y);
730 while (cinfo.output_scanline < crop_y + crop_height) {
731 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
732 dest_mgr->buffer_height);
733 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
734 }
735 jpeg_skip_scanlines(&cinfo, cinfo.output_height - crop_y - crop_height);
736
737 /* Normal full-image decompress */
738 } else {
739 /* Write output file header */
740 (*dest_mgr->start_output) (&cinfo, dest_mgr);
741
742 /* Process data */
743 while (cinfo.output_scanline < cinfo.output_height) {
744 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
745 dest_mgr->buffer_height);
746 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
747 }
748 }
749
750 #ifdef PROGRESS_REPORT
751 /* Hack: count final pass as done in case finish_output does an extra pass.
752 * The library won't have updated completed_passes.
753 */
754 progress.pub.completed_passes = progress.pub.total_passes;
755 #endif
756
757 /* Finish decompression and release memory.
758 * I must do it in this order because output module has allocated memory
759 * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory.
760 */
761 (*dest_mgr->finish_output) (&cinfo, dest_mgr);
762 (void) jpeg_finish_decompress(&cinfo);
763 jpeg_destroy_decompress(&cinfo);
764
765 /* Close files, if we opened them */
766 if (input_file != stdin)
767 fclose(input_file);
768 if (output_file != stdout)
769 fclose(output_file);
770
771 #ifdef PROGRESS_REPORT
772 end_progress_monitor((j_common_ptr) &cinfo);
773 #endif
774
775 if (memsrc && inbuffer != NULL)
776 free(inbuffer);
777
778 /* All done. */
779 exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
780 return 0; /* suppress no-return-value warnings */
781 }
782