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 2013-2019 by Guido Vollbeding.
7 * libjpeg-turbo Modifications:
8 * Copyright (C) 2010-2011, 2013-2017, 2019-2020, 2022, 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 #ifdef _MSC_VER
32 #define _CRT_SECURE_NO_DEPRECATE
33 #endif
34
35 #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
36 #include "jversion.h" /* for version message */
37 #include "jconfigint.h"
38
39 #include <ctype.h> /* to declare isprint() */
40
41
42 /* Create the add-on message string table. */
43
44 #define JMESSAGE(code, string) string,
45
46 static const char * const cdjpeg_message_table[] = {
47 #include "cderror.h"
48 NULL
49 };
50
51
52 /*
53 * This list defines the known output image formats
54 * (not all of which need be supported by a given version).
55 * You can change the default output format by defining DEFAULT_FMT;
56 * indeed, you had better do so if you undefine PPM_SUPPORTED.
57 */
58
59 typedef enum {
60 FMT_BMP, /* BMP format (Windows flavor) */
61 FMT_GIF, /* GIF format (LZW-compressed) */
62 FMT_GIF0, /* GIF format (uncompressed) */
63 FMT_OS2, /* BMP format (OS/2 flavor) */
64 FMT_PPM, /* PPM/PGM (PBMPLUS formats) */
65 FMT_TARGA, /* Targa format */
66 FMT_TIFF /* TIFF format */
67 } IMAGE_FORMATS;
68
69 #ifndef DEFAULT_FMT /* so can override from CFLAGS in Makefile */
70 #define DEFAULT_FMT FMT_PPM
71 #endif
72
73 static IMAGE_FORMATS requested_fmt;
74
75
76 /*
77 * Argument-parsing code.
78 * The switch parser is designed to be useful with DOS-style command line
79 * syntax, ie, intermixed switches and file names, where only the switches
80 * to the left of a given file name affect processing of that file.
81 * The main program in this file doesn't actually use this capability...
82 */
83
84
85 static const char *progname; /* program name for error messages */
86 static char *icc_filename; /* for -icc switch */
87 static JDIMENSION max_scans; /* for -maxscans switch */
88 static char *outfilename; /* for -outfile switch */
89 static boolean memsrc; /* for -memsrc switch */
90 static boolean report; /* for -report switch */
91 boolean skip, crop;
92 JDIMENSION skip_start, skip_end;
93 JDIMENSION crop_x, crop_y, crop_width, crop_height;
94 static boolean strict; /* for -strict switch */
95 #define INPUT_BUF_SIZE 4096
96
97
98 LOCAL(void)
usage(void)99 usage(void)
100 /* complain about bad command line */
101 {
102 fprintf(stderr, "usage: %s [switches] ", progname);
103 #ifdef TWO_FILE_COMMANDLINE
104 fprintf(stderr, "inputfile outputfile\n");
105 #else
106 fprintf(stderr, "[inputfile]\n");
107 #endif
108
109 fprintf(stderr, "Switches (names may be abbreviated):\n");
110 fprintf(stderr, " -colors N Reduce image to no more than N colors\n");
111 fprintf(stderr, " -fast Fast, low-quality processing\n");
112 fprintf(stderr, " -grayscale Force grayscale output\n");
113 fprintf(stderr, " -rgb Force RGB output\n");
114 fprintf(stderr, " -rgb565 Force RGB565 output\n");
115 #ifdef IDCT_SCALING_SUPPORTED
116 fprintf(stderr, " -scale M/N Scale output image by fraction M/N, eg, 1/8\n");
117 #endif
118 #ifdef BMP_SUPPORTED
119 fprintf(stderr, " -bmp Select BMP output format (Windows style)%s\n",
120 (DEFAULT_FMT == FMT_BMP ? " (default)" : ""));
121 #endif
122 #ifdef GIF_SUPPORTED
123 fprintf(stderr, " -gif Select GIF output format (LZW-compressed)%s\n",
124 (DEFAULT_FMT == FMT_GIF ? " (default)" : ""));
125 fprintf(stderr, " -gif0 Select GIF output format (uncompressed)%s\n",
126 (DEFAULT_FMT == FMT_GIF0 ? " (default)" : ""));
127 #endif
128 #ifdef BMP_SUPPORTED
129 fprintf(stderr, " -os2 Select BMP output format (OS/2 style)%s\n",
130 (DEFAULT_FMT == FMT_OS2 ? " (default)" : ""));
131 #endif
132 #ifdef PPM_SUPPORTED
133 fprintf(stderr, " -pnm Select PBMPLUS (PPM/PGM) output format%s\n",
134 (DEFAULT_FMT == FMT_PPM ? " (default)" : ""));
135 #endif
136 #ifdef TARGA_SUPPORTED
137 fprintf(stderr, " -targa Select Targa output format%s\n",
138 (DEFAULT_FMT == FMT_TARGA ? " (default)" : ""));
139 #endif
140 fprintf(stderr, "Switches for advanced users:\n");
141 #ifdef DCT_ISLOW_SUPPORTED
142 fprintf(stderr, " -dct int Use accurate integer DCT method%s\n",
143 (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
144 #endif
145 #ifdef DCT_IFAST_SUPPORTED
146 fprintf(stderr, " -dct fast Use less accurate integer DCT method [legacy feature]%s\n",
147 (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
148 #endif
149 #ifdef DCT_FLOAT_SUPPORTED
150 fprintf(stderr, " -dct float Use floating-point DCT method [legacy feature]%s\n",
151 (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
152 #endif
153 fprintf(stderr, " -dither fs Use F-S dithering (default)\n");
154 fprintf(stderr, " -dither none Don't use dithering in quantization\n");
155 fprintf(stderr, " -dither ordered Use ordered dither (medium speed, quality)\n");
156 fprintf(stderr, " -icc FILE Extract ICC profile to FILE\n");
157 #ifdef QUANT_2PASS_SUPPORTED
158 fprintf(stderr, " -map FILE Map to colors used in named image file\n");
159 #endif
160 fprintf(stderr, " -nosmooth Don't use high-quality upsampling\n");
161 #ifdef QUANT_1PASS_SUPPORTED
162 fprintf(stderr, " -onepass Use 1-pass quantization (fast, low quality)\n");
163 #endif
164 fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n");
165 fprintf(stderr, " -maxscans N Maximum number of scans to allow in input file\n");
166 fprintf(stderr, " -outfile name Specify name for output file\n");
167 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
168 fprintf(stderr, " -memsrc Load input file into memory before decompressing\n");
169 #endif
170 fprintf(stderr, " -report Report decompression progress\n");
171 fprintf(stderr, " -skip Y0,Y1 Decompress all rows except those between Y0 and Y1 (inclusive)\n");
172 fprintf(stderr, " -crop WxH+X+Y Decompress only a rectangular subregion of the image\n");
173 fprintf(stderr, " [requires PBMPLUS (PPM/PGM), GIF, or Targa output format]\n");
174 fprintf(stderr, " -strict Treat all warnings as fatal\n");
175 fprintf(stderr, " -verbose or -debug Emit debug output\n");
176 fprintf(stderr, " -version Print version information and exit\n");
177 exit(EXIT_FAILURE);
178 }
179
180
181 LOCAL(int)
parse_switches(j_decompress_ptr cinfo,int argc,char ** argv,int last_file_arg_seen,boolean for_real)182 parse_switches(j_decompress_ptr cinfo, int argc, char **argv,
183 int last_file_arg_seen, boolean for_real)
184 /* Parse optional switches.
185 * Returns argv[] index of first file-name argument (== argc if none).
186 * Any file names with indexes <= last_file_arg_seen are ignored;
187 * they have presumably been processed in a previous iteration.
188 * (Pass 0 for last_file_arg_seen on the first or only iteration.)
189 * for_real is FALSE on the first (dummy) pass; we may skip any expensive
190 * processing.
191 */
192 {
193 int argn;
194 char *arg;
195
196 /* Set up default JPEG parameters. */
197 requested_fmt = DEFAULT_FMT; /* set default output file format */
198 icc_filename = NULL;
199 max_scans = 0;
200 outfilename = NULL;
201 memsrc = FALSE;
202 report = FALSE;
203 skip = FALSE;
204 crop = FALSE;
205 strict = FALSE;
206 cinfo->err->trace_level = 0;
207
208 /* Scan command line options, adjust parameters */
209
210 for (argn = 1; argn < argc; argn++) {
211 arg = argv[argn];
212 if (*arg != '-') {
213 /* Not a switch, must be a file name argument */
214 if (argn <= last_file_arg_seen) {
215 outfilename = NULL; /* -outfile applies to just one input file */
216 continue; /* ignore this name if previously processed */
217 }
218 break; /* else done parsing switches */
219 }
220 arg++; /* advance past switch marker character */
221
222 if (keymatch(arg, "bmp", 1)) {
223 /* BMP output format (Windows flavor). */
224 requested_fmt = FMT_BMP;
225
226 } else if (keymatch(arg, "colors", 1) || keymatch(arg, "colours", 1) ||
227 keymatch(arg, "quantize", 1) || keymatch(arg, "quantise", 1)) {
228 /* Do color quantization. */
229 int val;
230
231 if (++argn >= argc) /* advance to next argument */
232 usage();
233 if (sscanf(argv[argn], "%d", &val) != 1)
234 usage();
235 cinfo->desired_number_of_colors = val;
236 cinfo->quantize_colors = TRUE;
237
238 } else if (keymatch(arg, "dct", 2)) {
239 /* Select IDCT algorithm. */
240 if (++argn >= argc) /* advance to next argument */
241 usage();
242 if (keymatch(argv[argn], "int", 1)) {
243 cinfo->dct_method = JDCT_ISLOW;
244 } else if (keymatch(argv[argn], "fast", 2)) {
245 cinfo->dct_method = JDCT_IFAST;
246 } else if (keymatch(argv[argn], "float", 2)) {
247 cinfo->dct_method = JDCT_FLOAT;
248 } else
249 usage();
250
251 } else if (keymatch(arg, "dither", 2)) {
252 /* Select dithering algorithm. */
253 if (++argn >= argc) /* advance to next argument */
254 usage();
255 if (keymatch(argv[argn], "fs", 2)) {
256 cinfo->dither_mode = JDITHER_FS;
257 } else if (keymatch(argv[argn], "none", 2)) {
258 cinfo->dither_mode = JDITHER_NONE;
259 } else if (keymatch(argv[argn], "ordered", 2)) {
260 cinfo->dither_mode = JDITHER_ORDERED;
261 } else
262 usage();
263
264 } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
265 /* Enable debug printouts. */
266 /* On first -d, print version identification */
267 static boolean printed_version = FALSE;
268
269 if (!printed_version) {
270 fprintf(stderr, "%s version %s (build %s)\n",
271 PACKAGE_NAME, VERSION, BUILD);
272 fprintf(stderr, "%s\n\n", JCOPYRIGHT);
273 fprintf(stderr, "Emulating The Independent JPEG Group's software, version %s\n\n",
274 JVERSION);
275 printed_version = TRUE;
276 }
277 cinfo->err->trace_level++;
278
279 } else if (keymatch(arg, "version", 4)) {
280 fprintf(stderr, "%s version %s (build %s)\n",
281 PACKAGE_NAME, VERSION, BUILD);
282 exit(EXIT_SUCCESS);
283
284 } else if (keymatch(arg, "fast", 1)) {
285 /* Select recommended processing options for quick-and-dirty output. */
286 cinfo->two_pass_quantize = FALSE;
287 cinfo->dither_mode = JDITHER_ORDERED;
288 if (!cinfo->quantize_colors) /* don't override an earlier -colors */
289 cinfo->desired_number_of_colors = 216;
290 cinfo->dct_method = JDCT_FASTEST;
291 cinfo->do_fancy_upsampling = FALSE;
292
293 } else if (keymatch(arg, "gif", 1)) {
294 /* GIF output format (LZW-compressed). */
295 requested_fmt = FMT_GIF;
296
297 } else if (keymatch(arg, "gif0", 4)) {
298 /* GIF output format (uncompressed). */
299 requested_fmt = FMT_GIF0;
300
301 } else if (keymatch(arg, "grayscale", 2) ||
302 keymatch(arg, "greyscale", 2)) {
303 /* Force monochrome output. */
304 cinfo->out_color_space = JCS_GRAYSCALE;
305
306 } else if (keymatch(arg, "rgb", 2)) {
307 /* Force RGB output. */
308 cinfo->out_color_space = JCS_RGB;
309
310 } else if (keymatch(arg, "rgb565", 2)) {
311 /* Force RGB565 output. */
312 cinfo->out_color_space = JCS_RGB565;
313
314 } else if (keymatch(arg, "icc", 1)) {
315 /* Set ICC filename. */
316 if (++argn >= argc) /* advance to next argument */
317 usage();
318 icc_filename = argv[argn];
319 #ifdef SAVE_MARKERS_SUPPORTED
320 jpeg_save_markers(cinfo, JPEG_APP0 + 2, 0xFFFF);
321 #endif
322
323 } else if (keymatch(arg, "map", 3)) {
324 /* Quantize to a color map taken from an input file. */
325 if (++argn >= argc) /* advance to next argument */
326 usage();
327 if (for_real) { /* too expensive to do twice! */
328 #ifdef QUANT_2PASS_SUPPORTED /* otherwise can't quantize to supplied map */
329 FILE *mapfile;
330
331 if ((mapfile = fopen(argv[argn], READ_BINARY)) == NULL) {
332 fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]);
333 exit(EXIT_FAILURE);
334 }
335 read_color_map(cinfo, mapfile);
336 fclose(mapfile);
337 cinfo->quantize_colors = TRUE;
338 #else
339 ERREXIT(cinfo, JERR_NOT_COMPILED);
340 #endif
341 }
342
343 } else if (keymatch(arg, "maxmemory", 3)) {
344 /* Maximum memory in Kb (or Mb with 'm'). */
345 long lval;
346 char ch = 'x';
347
348 if (++argn >= argc) /* advance to next argument */
349 usage();
350 if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
351 usage();
352 if (ch == 'm' || ch == 'M')
353 lval *= 1000L;
354 cinfo->mem->max_memory_to_use = lval * 1000L;
355
356 } else if (keymatch(arg, "maxscans", 4)) {
357 if (++argn >= argc) /* advance to next argument */
358 usage();
359 if (sscanf(argv[argn], "%u", &max_scans) != 1)
360 usage();
361
362 } else if (keymatch(arg, "nosmooth", 3)) {
363 /* Suppress fancy upsampling */
364 cinfo->do_fancy_upsampling = FALSE;
365
366 } else if (keymatch(arg, "onepass", 3)) {
367 /* Use fast one-pass quantization. */
368 cinfo->two_pass_quantize = FALSE;
369
370 } else if (keymatch(arg, "os2", 3)) {
371 /* BMP output format (OS/2 flavor). */
372 requested_fmt = FMT_OS2;
373
374 } else if (keymatch(arg, "outfile", 4)) {
375 /* Set output file name. */
376 if (++argn >= argc) /* advance to next argument */
377 usage();
378 outfilename = argv[argn]; /* save it away for later use */
379
380 } else if (keymatch(arg, "memsrc", 2)) {
381 /* Use in-memory source manager */
382 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
383 memsrc = TRUE;
384 #else
385 fprintf(stderr, "%s: sorry, in-memory source manager was not compiled in\n",
386 progname);
387 exit(EXIT_FAILURE);
388 #endif
389
390 } else if (keymatch(arg, "pnm", 1) || keymatch(arg, "ppm", 1)) {
391 /* PPM/PGM output format. */
392 requested_fmt = FMT_PPM;
393
394 } else if (keymatch(arg, "report", 2)) {
395 report = TRUE;
396
397 } else if (keymatch(arg, "scale", 2)) {
398 /* Scale the output image by a fraction M/N. */
399 if (++argn >= argc) /* advance to next argument */
400 usage();
401 if (sscanf(argv[argn], "%u/%u",
402 &cinfo->scale_num, &cinfo->scale_denom) != 2)
403 usage();
404
405 } else if (keymatch(arg, "skip", 2)) {
406 if (++argn >= argc)
407 usage();
408 if (sscanf(argv[argn], "%u,%u", &skip_start, &skip_end) != 2 ||
409 skip_start > skip_end)
410 usage();
411 skip = TRUE;
412
413 } else if (keymatch(arg, "crop", 2)) {
414 char c;
415 if (++argn >= argc)
416 usage();
417 if (sscanf(argv[argn], "%u%c%u+%u+%u", &crop_width, &c, &crop_height,
418 &crop_x, &crop_y) != 5 ||
419 (c != 'X' && c != 'x') || crop_width < 1 || crop_height < 1)
420 usage();
421 crop = TRUE;
422
423 } else if (keymatch(arg, "strict", 2)) {
424 strict = TRUE;
425
426 } else if (keymatch(arg, "targa", 1)) {
427 /* Targa output format. */
428 requested_fmt = FMT_TARGA;
429
430 } else {
431 usage(); /* bogus switch */
432 }
433 }
434
435 return argn; /* return index of next arg (file name) */
436 }
437
438
439 /*
440 * Marker processor for COM and interesting APPn markers.
441 * This replaces the library's built-in processor, which just skips the marker.
442 * We want to print out the marker as text, to the extent possible.
443 * Note this code relies on a non-suspending data source.
444 */
445
446 LOCAL(unsigned int)
jpeg_getc(j_decompress_ptr cinfo)447 jpeg_getc(j_decompress_ptr cinfo)
448 /* Read next byte */
449 {
450 struct jpeg_source_mgr *datasrc = cinfo->src;
451
452 if (datasrc->bytes_in_buffer == 0) {
453 if (!(*datasrc->fill_input_buffer) (cinfo))
454 ERREXIT(cinfo, JERR_CANT_SUSPEND);
455 }
456 datasrc->bytes_in_buffer--;
457 return *datasrc->next_input_byte++;
458 }
459
460
461 METHODDEF(boolean)
print_text_marker(j_decompress_ptr cinfo)462 print_text_marker(j_decompress_ptr cinfo)
463 {
464 boolean traceit = (cinfo->err->trace_level >= 1);
465 long length;
466 unsigned int ch;
467 unsigned int lastch = 0;
468
469 length = jpeg_getc(cinfo) << 8;
470 length += jpeg_getc(cinfo);
471 length -= 2; /* discount the length word itself */
472
473 if (traceit) {
474 if (cinfo->unread_marker == JPEG_COM)
475 fprintf(stderr, "Comment, length %ld:\n", (long)length);
476 else /* assume it is an APPn otherwise */
477 fprintf(stderr, "APP%d, length %ld:\n",
478 cinfo->unread_marker - JPEG_APP0, (long)length);
479 }
480
481 while (--length >= 0) {
482 ch = jpeg_getc(cinfo);
483 if (traceit) {
484 /* Emit the character in a readable form.
485 * Nonprintables are converted to \nnn form,
486 * while \ is converted to \\.
487 * Newlines in CR, CR/LF, or LF form will be printed as one newline.
488 */
489 if (ch == '\r') {
490 fprintf(stderr, "\n");
491 } else if (ch == '\n') {
492 if (lastch != '\r')
493 fprintf(stderr, "\n");
494 } else if (ch == '\\') {
495 fprintf(stderr, "\\\\");
496 } else if (isprint(ch)) {
497 putc(ch, stderr);
498 } else {
499 fprintf(stderr, "\\%03o", ch);
500 }
501 lastch = ch;
502 }
503 }
504
505 if (traceit)
506 fprintf(stderr, "\n");
507
508 return TRUE;
509 }
510
511
512 METHODDEF(void)
my_emit_message(j_common_ptr cinfo,int msg_level)513 my_emit_message(j_common_ptr cinfo, int msg_level)
514 {
515 if (msg_level < 0) {
516 /* Treat warning as fatal */
517 cinfo->err->error_exit(cinfo);
518 } else {
519 if (cinfo->err->trace_level >= msg_level)
520 cinfo->err->output_message(cinfo);
521 }
522 }
523
524
525 /*
526 * The main program.
527 */
528
529 int
530 #ifdef GTEST
djpeg(int argc,char ** argv)531 djpeg(int argc, char **argv)
532 #else
533 main(int argc, char **argv)
534 #endif
535 {
536 struct jpeg_decompress_struct cinfo;
537 struct jpeg_error_mgr jerr;
538 struct cdjpeg_progress_mgr progress;
539 int file_index;
540 djpeg_dest_ptr dest_mgr = NULL;
541 FILE *input_file;
542 FILE *output_file;
543 unsigned char *inbuffer = NULL;
544 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
545 unsigned long insize = 0;
546 #endif
547 JDIMENSION num_scanlines;
548
549 progname = argv[0];
550 if (progname == NULL || progname[0] == 0)
551 progname = "djpeg"; /* in case C library doesn't provide it */
552
553 /* Initialize the JPEG decompression object with default error handling. */
554 cinfo.err = jpeg_std_error(&jerr);
555 jpeg_create_decompress(&cinfo);
556 /* Add some application-specific error messages (from cderror.h) */
557 jerr.addon_message_table = cdjpeg_message_table;
558 jerr.first_addon_message = JMSG_FIRSTADDONCODE;
559 jerr.last_addon_message = JMSG_LASTADDONCODE;
560
561 /* Insert custom marker processor for COM and APP12.
562 * APP12 is used by some digital camera makers for textual info,
563 * so we provide the ability to display it as text.
564 * If you like, additional APPn marker types can be selected for display,
565 * but don't try to override APP0 or APP14 this way (see libjpeg.txt).
566 */
567 jpeg_set_marker_processor(&cinfo, JPEG_COM, print_text_marker);
568 jpeg_set_marker_processor(&cinfo, JPEG_APP0 + 12, print_text_marker);
569
570 /* Scan command line to find file names. */
571 /* It is convenient to use just one switch-parsing routine, but the switch
572 * values read here are ignored; we will rescan the switches after opening
573 * the input file.
574 * (Exception: tracing level set here controls verbosity for COM markers
575 * found during jpeg_read_header...)
576 */
577
578 file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
579
580 if (strict)
581 jerr.emit_message = my_emit_message;
582
583 #ifdef TWO_FILE_COMMANDLINE
584 /* Must have either -outfile switch or explicit output file name */
585 if (outfilename == NULL) {
586 if (file_index != argc - 2) {
587 fprintf(stderr, "%s: must name one input and one output file\n",
588 progname);
589 usage();
590 }
591 outfilename = argv[file_index + 1];
592 } else {
593 if (file_index != argc - 1) {
594 fprintf(stderr, "%s: must name one input and one output file\n",
595 progname);
596 usage();
597 }
598 }
599 #else
600 /* Unix style: expect zero or one file name */
601 if (file_index < argc - 1) {
602 fprintf(stderr, "%s: only one input file\n", progname);
603 usage();
604 }
605 #endif /* TWO_FILE_COMMANDLINE */
606
607 /* Open the input file. */
608 if (file_index < argc) {
609 if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
610 fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
611 return EXIT_FAILURE;
612 }
613 } else {
614 /* default input file is stdin */
615 input_file = read_stdin();
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 return EXIT_FAILURE;
623 }
624 } else {
625 /* default output file is stdout */
626 output_file = write_stdout();
627 }
628
629 if (report || max_scans != 0) {
630 start_progress_monitor((j_common_ptr)&cinfo, &progress);
631 progress.report = report;
632 progress.max_scans = max_scans;
633 }
634
635 /* Specify data source for decompression */
636 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
637 if (memsrc) {
638 size_t nbytes;
639 do {
640 inbuffer = (unsigned char *)realloc(inbuffer, insize + INPUT_BUF_SIZE);
641 if (inbuffer == NULL) {
642 fprintf(stderr, "%s: memory allocation failure\n", progname);
643 return EXIT_FAILURE;
644 }
645 nbytes = fread(&inbuffer[insize], 1, INPUT_BUF_SIZE, input_file);
646 if (nbytes < INPUT_BUF_SIZE && ferror(input_file)) {
647 if (file_index < argc)
648 fprintf(stderr, "%s: can't read from %s\n", progname,
649 argv[file_index]);
650 else
651 fprintf(stderr, "%s: can't read from stdin\n", progname);
652 }
653 insize += (unsigned long)nbytes;
654 } while (nbytes == INPUT_BUF_SIZE);
655 fprintf(stderr, "Compressed size: %lu bytes\n", insize);
656 jpeg_mem_src(&cinfo, inbuffer, insize);
657 } else
658 #endif
659 jpeg_stdio_src(&cinfo, input_file);
660
661 /* Read file header, set default decompression parameters */
662 (void)jpeg_read_header(&cinfo, TRUE);
663
664 /* Adjust default decompression parameters by re-parsing the options */
665 file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
666
667 /* Initialize the output module now to let it override any crucial
668 * option settings (for instance, GIF wants to force color quantization).
669 */
670 switch (requested_fmt) {
671 #ifdef BMP_SUPPORTED
672 case FMT_BMP:
673 dest_mgr = jinit_write_bmp(&cinfo, FALSE, TRUE);
674 break;
675 case FMT_OS2:
676 dest_mgr = jinit_write_bmp(&cinfo, TRUE, TRUE);
677 break;
678 #endif
679 #ifdef GIF_SUPPORTED
680 case FMT_GIF:
681 dest_mgr = jinit_write_gif(&cinfo, TRUE);
682 break;
683 case FMT_GIF0:
684 dest_mgr = jinit_write_gif(&cinfo, FALSE);
685 break;
686 #endif
687 #ifdef PPM_SUPPORTED
688 case FMT_PPM:
689 dest_mgr = jinit_write_ppm(&cinfo);
690 break;
691 #endif
692 #ifdef TARGA_SUPPORTED
693 case FMT_TARGA:
694 dest_mgr = jinit_write_targa(&cinfo);
695 break;
696 #endif
697 default:
698 ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT);
699 break;
700 }
701 dest_mgr->output_file = output_file;
702
703 /* Start decompressor */
704 (void)jpeg_start_decompress(&cinfo);
705
706 /* Skip rows */
707 if (skip) {
708 JDIMENSION tmp;
709
710 /* Check for valid skip_end. We cannot check this value until after
711 * jpeg_start_decompress() is called. Note that we have already verified
712 * that skip_start <= skip_end.
713 */
714 if (skip_end > cinfo.output_height - 1) {
715 fprintf(stderr, "%s: skip region exceeds image height %u\n", progname,
716 cinfo.output_height);
717 return EXIT_FAILURE;
718 }
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 -= (skip_end - skip_start + 1);
725 (*dest_mgr->start_output) (&cinfo, dest_mgr);
726 cinfo.output_height = tmp;
727
728 /* Process data */
729 while (cinfo.output_scanline < skip_start) {
730 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
731 dest_mgr->buffer_height);
732 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
733 }
734 if ((tmp = jpeg_skip_scanlines(&cinfo, skip_end - skip_start + 1)) !=
735 skip_end - skip_start + 1) {
736 fprintf(stderr, "%s: jpeg_skip_scanlines() returned %u rather than %u\n",
737 progname, tmp, skip_end - skip_start + 1);
738 return EXIT_FAILURE;
739 }
740 while (cinfo.output_scanline < cinfo.output_height) {
741 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
742 dest_mgr->buffer_height);
743 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
744 }
745
746 /* Decompress a subregion */
747 } else if (crop) {
748 JDIMENSION tmp;
749
750 /* Check for valid crop dimensions. We cannot check these values until
751 * after jpeg_start_decompress() is called.
752 */
753 if (crop_x + crop_width > cinfo.output_width ||
754 crop_y + crop_height > cinfo.output_height) {
755 fprintf(stderr, "%s: crop dimensions exceed image dimensions %u x %u\n",
756 progname, cinfo.output_width, cinfo.output_height);
757 return EXIT_FAILURE;
758 }
759
760 jpeg_crop_scanline(&cinfo, &crop_x, &crop_width);
761 if (dest_mgr->calc_buffer_dimensions)
762 (*dest_mgr->calc_buffer_dimensions) (&cinfo, dest_mgr);
763 else
764 ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT);
765
766 /* Write output file header. This is a hack to ensure that the destination
767 * manager creates an output image of the proper size.
768 */
769 tmp = cinfo.output_height;
770 cinfo.output_height = crop_height;
771 (*dest_mgr->start_output) (&cinfo, dest_mgr);
772 cinfo.output_height = tmp;
773
774 /* Process data */
775 if ((tmp = jpeg_skip_scanlines(&cinfo, crop_y)) != crop_y) {
776 fprintf(stderr, "%s: jpeg_skip_scanlines() returned %u rather than %u\n",
777 progname, tmp, crop_y);
778 return EXIT_FAILURE;
779 }
780 while (cinfo.output_scanline < crop_y + crop_height) {
781 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
782 dest_mgr->buffer_height);
783 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
784 }
785 if ((tmp =
786 jpeg_skip_scanlines(&cinfo,
787 cinfo.output_height - crop_y - crop_height)) !=
788 cinfo.output_height - crop_y - crop_height) {
789 fprintf(stderr, "%s: jpeg_skip_scanlines() returned %u rather than %u\n",
790 progname, tmp, cinfo.output_height - crop_y - crop_height);
791 return EXIT_FAILURE;
792 }
793
794 /* Normal full-image decompress */
795 } else {
796 /* Write output file header */
797 (*dest_mgr->start_output) (&cinfo, dest_mgr);
798
799 /* Process data */
800 while (cinfo.output_scanline < cinfo.output_height) {
801 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
802 dest_mgr->buffer_height);
803 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
804 }
805 }
806
807 /* Hack: count final pass as done in case finish_output does an extra pass.
808 * The library won't have updated completed_passes.
809 */
810 if (report || max_scans != 0)
811 progress.pub.completed_passes = progress.pub.total_passes;
812
813 if (icc_filename != NULL) {
814 FILE *icc_file;
815 JOCTET *icc_profile;
816 unsigned int icc_len;
817
818 if ((icc_file = fopen(icc_filename, WRITE_BINARY)) == NULL) {
819 fprintf(stderr, "%s: can't open %s\n", progname, icc_filename);
820 return EXIT_FAILURE;
821 }
822 if (jpeg_read_icc_profile(&cinfo, &icc_profile, &icc_len)) {
823 if (fwrite(icc_profile, icc_len, 1, icc_file) < 1) {
824 fprintf(stderr, "%s: can't read ICC profile from %s\n", progname,
825 icc_filename);
826 free(icc_profile);
827 fclose(icc_file);
828 return EXIT_FAILURE;
829 }
830 free(icc_profile);
831 fclose(icc_file);
832 } else if (cinfo.err->msg_code != JWRN_BOGUS_ICC)
833 fprintf(stderr, "%s: no ICC profile data in JPEG file\n", progname);
834 }
835
836 /* Finish decompression and release memory.
837 * I must do it in this order because output module has allocated memory
838 * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory.
839 */
840 (*dest_mgr->finish_output) (&cinfo, dest_mgr);
841 (void)jpeg_finish_decompress(&cinfo);
842 jpeg_destroy_decompress(&cinfo);
843
844 /* Close files, if we opened them */
845 if (input_file != stdin)
846 fclose(input_file);
847 if (output_file != stdout)
848 fclose(output_file);
849
850 if (report || max_scans != 0)
851 end_progress_monitor((j_common_ptr)&cinfo);
852
853 if (memsrc)
854 free(inbuffer);
855
856 /* All done. */
857 return (jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
858 }
859