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, 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
35 #ifndef HAVE_STDLIB_H /* <stdlib.h> should declare free() */
36 extern void free(void *ptr);
37 #endif
38
39 #include <ctype.h> /* to declare isprint() */
40
41 #ifdef USE_CCOMMAND /* command-line reader for Macintosh */
42 #ifdef __MWERKS__
43 #include <SIOUX.h> /* Metrowerks needs this */
44 #include <console.h> /* ... and this */
45 #endif
46 #ifdef THINK_C
47 #include <console.h> /* Think declares it here */
48 #endif
49 #endif
50
51
52 /* Create the add-on message string table. */
53
54 #define JMESSAGE(code, string) string,
55
56 static const char * const cdjpeg_message_table[] = {
57 #include "cderror.h"
58 NULL
59 };
60
61
62 /*
63 * This list defines the known output image formats
64 * (not all of which need be supported by a given version).
65 * You can change the default output format by defining DEFAULT_FMT;
66 * indeed, you had better do so if you undefine PPM_SUPPORTED.
67 */
68
69 typedef enum {
70 FMT_BMP, /* BMP format (Windows flavor) */
71 FMT_GIF, /* GIF format (LZW-compressed) */
72 FMT_GIF0, /* GIF format (uncompressed) */
73 FMT_OS2, /* BMP format (OS/2 flavor) */
74 FMT_PPM, /* PPM/PGM (PBMPLUS formats) */
75 FMT_TARGA, /* Targa format */
76 FMT_TIFF /* TIFF format */
77 } IMAGE_FORMATS;
78
79 #ifndef DEFAULT_FMT /* so can override from CFLAGS in Makefile */
80 #define DEFAULT_FMT FMT_PPM
81 #endif
82
83 static IMAGE_FORMATS requested_fmt;
84
85
86 /*
87 * Argument-parsing code.
88 * The switch parser is designed to be useful with DOS-style command line
89 * syntax, ie, intermixed switches and file names, where only the switches
90 * to the left of a given file name affect processing of that file.
91 * The main program in this file doesn't actually use this capability...
92 */
93
94
95 static const char *progname; /* program name for error messages */
96 static char *icc_filename; /* for -icc switch */
97 static JDIMENSION max_scans; /* for -maxscans switch */
98 static char *outfilename; /* for -outfile switch */
99 static boolean memsrc; /* for -memsrc switch */
100 static boolean report; /* for -report switch */
101 boolean skip, crop;
102 JDIMENSION skip_start, skip_end;
103 JDIMENSION crop_x, crop_y, crop_width, crop_height;
104 static boolean strict; /* for -strict switch */
105 #define INPUT_BUF_SIZE 4096
106
107
108 LOCAL(void)
usage(void)109 usage(void)
110 /* complain about bad command line */
111 {
112 fprintf(stderr, "usage: %s [switches] ", progname);
113 #ifdef TWO_FILE_COMMANDLINE
114 fprintf(stderr, "inputfile outputfile\n");
115 #else
116 fprintf(stderr, "[inputfile]\n");
117 #endif
118
119 fprintf(stderr, "Switches (names may be abbreviated):\n");
120 fprintf(stderr, " -colors N Reduce image to no more than N colors\n");
121 fprintf(stderr, " -fast Fast, low-quality processing\n");
122 fprintf(stderr, " -grayscale Force grayscale output\n");
123 fprintf(stderr, " -rgb Force RGB output\n");
124 fprintf(stderr, " -rgb565 Force RGB565 output\n");
125 #ifdef IDCT_SCALING_SUPPORTED
126 fprintf(stderr, " -scale M/N Scale output image by fraction M/N, eg, 1/8\n");
127 #endif
128 #ifdef BMP_SUPPORTED
129 fprintf(stderr, " -bmp Select BMP output format (Windows style)%s\n",
130 (DEFAULT_FMT == FMT_BMP ? " (default)" : ""));
131 #endif
132 #ifdef GIF_SUPPORTED
133 fprintf(stderr, " -gif Select GIF output format (LZW-compressed)%s\n",
134 (DEFAULT_FMT == FMT_GIF ? " (default)" : ""));
135 fprintf(stderr, " -gif0 Select GIF output format (uncompressed)%s\n",
136 (DEFAULT_FMT == FMT_GIF0 ? " (default)" : ""));
137 #endif
138 #ifdef BMP_SUPPORTED
139 fprintf(stderr, " -os2 Select BMP output format (OS/2 style)%s\n",
140 (DEFAULT_FMT == FMT_OS2 ? " (default)" : ""));
141 #endif
142 #ifdef PPM_SUPPORTED
143 fprintf(stderr, " -pnm Select PBMPLUS (PPM/PGM) output format%s\n",
144 (DEFAULT_FMT == FMT_PPM ? " (default)" : ""));
145 #endif
146 #ifdef TARGA_SUPPORTED
147 fprintf(stderr, " -targa Select Targa output format%s\n",
148 (DEFAULT_FMT == FMT_TARGA ? " (default)" : ""));
149 #endif
150 fprintf(stderr, "Switches for advanced users:\n");
151 #ifdef DCT_ISLOW_SUPPORTED
152 fprintf(stderr, " -dct int Use accurate integer DCT method%s\n",
153 (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
154 #endif
155 #ifdef DCT_IFAST_SUPPORTED
156 fprintf(stderr, " -dct fast Use less accurate integer DCT method [legacy feature]%s\n",
157 (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
158 #endif
159 #ifdef DCT_FLOAT_SUPPORTED
160 fprintf(stderr, " -dct float Use floating-point DCT method [legacy feature]%s\n",
161 (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
162 #endif
163 fprintf(stderr, " -dither fs Use F-S dithering (default)\n");
164 fprintf(stderr, " -dither none Don't use dithering in quantization\n");
165 fprintf(stderr, " -dither ordered Use ordered dither (medium speed, quality)\n");
166 fprintf(stderr, " -icc FILE Extract ICC profile to FILE\n");
167 #ifdef QUANT_2PASS_SUPPORTED
168 fprintf(stderr, " -map FILE Map to colors used in named image file\n");
169 #endif
170 fprintf(stderr, " -nosmooth Don't use high-quality upsampling\n");
171 #ifdef QUANT_1PASS_SUPPORTED
172 fprintf(stderr, " -onepass Use 1-pass quantization (fast, low quality)\n");
173 #endif
174 fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n");
175 fprintf(stderr, " -maxscans N Maximum number of scans to allow in input file\n");
176 fprintf(stderr, " -outfile name Specify name for output file\n");
177 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
178 fprintf(stderr, " -memsrc Load input file into memory before decompressing\n");
179 #endif
180 fprintf(stderr, " -report Report decompression progress\n");
181 fprintf(stderr, " -skip Y0,Y1 Decompress all rows except those between Y0 and Y1 (inclusive)\n");
182 fprintf(stderr, " -crop WxH+X+Y Decompress only a rectangular subregion of the image\n");
183 fprintf(stderr, " [requires PBMPLUS (PPM/PGM), GIF, or Targa output format]\n");
184 fprintf(stderr, " -strict Treat all warnings as fatal\n");
185 fprintf(stderr, " -verbose or -debug Emit debug output\n");
186 fprintf(stderr, " -version Print version information and exit\n");
187 exit(EXIT_FAILURE);
188 }
189
190
191 LOCAL(int)
parse_switches(j_decompress_ptr cinfo,int argc,char ** argv,int last_file_arg_seen,boolean for_real)192 parse_switches(j_decompress_ptr cinfo, int argc, char **argv,
193 int last_file_arg_seen, boolean for_real)
194 /* Parse optional switches.
195 * Returns argv[] index of first file-name argument (== argc if none).
196 * Any file names with indexes <= last_file_arg_seen are ignored;
197 * they have presumably been processed in a previous iteration.
198 * (Pass 0 for last_file_arg_seen on the first or only iteration.)
199 * for_real is FALSE on the first (dummy) pass; we may skip any expensive
200 * processing.
201 */
202 {
203 int argn;
204 char *arg;
205
206 /* Set up default JPEG parameters. */
207 requested_fmt = DEFAULT_FMT; /* set default output file format */
208 icc_filename = NULL;
209 max_scans = 0;
210 outfilename = NULL;
211 memsrc = FALSE;
212 report = FALSE;
213 skip = FALSE;
214 crop = FALSE;
215 strict = FALSE;
216 cinfo->err->trace_level = 0;
217
218 /* Scan command line options, adjust parameters */
219
220 for (argn = 1; argn < argc; argn++) {
221 arg = argv[argn];
222 if (*arg != '-') {
223 /* Not a switch, must be a file name argument */
224 if (argn <= last_file_arg_seen) {
225 outfilename = NULL; /* -outfile applies to just one input file */
226 continue; /* ignore this name if previously processed */
227 }
228 break; /* else done parsing switches */
229 }
230 arg++; /* advance past switch marker character */
231
232 if (keymatch(arg, "bmp", 1)) {
233 /* BMP output format (Windows flavor). */
234 requested_fmt = FMT_BMP;
235
236 } else if (keymatch(arg, "colors", 1) || keymatch(arg, "colours", 1) ||
237 keymatch(arg, "quantize", 1) || keymatch(arg, "quantise", 1)) {
238 /* Do color quantization. */
239 int val;
240
241 if (++argn >= argc) /* advance to next argument */
242 usage();
243 if (sscanf(argv[argn], "%d", &val) != 1)
244 usage();
245 cinfo->desired_number_of_colors = val;
246 cinfo->quantize_colors = TRUE;
247
248 } else if (keymatch(arg, "dct", 2)) {
249 /* Select IDCT algorithm. */
250 if (++argn >= argc) /* advance to next argument */
251 usage();
252 if (keymatch(argv[argn], "int", 1)) {
253 cinfo->dct_method = JDCT_ISLOW;
254 } else if (keymatch(argv[argn], "fast", 2)) {
255 cinfo->dct_method = JDCT_IFAST;
256 } else if (keymatch(argv[argn], "float", 2)) {
257 cinfo->dct_method = JDCT_FLOAT;
258 } else
259 usage();
260
261 } else if (keymatch(arg, "dither", 2)) {
262 /* Select dithering algorithm. */
263 if (++argn >= argc) /* advance to next argument */
264 usage();
265 if (keymatch(argv[argn], "fs", 2)) {
266 cinfo->dither_mode = JDITHER_FS;
267 } else if (keymatch(argv[argn], "none", 2)) {
268 cinfo->dither_mode = JDITHER_NONE;
269 } else if (keymatch(argv[argn], "ordered", 2)) {
270 cinfo->dither_mode = JDITHER_ORDERED;
271 } else
272 usage();
273
274 } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
275 /* Enable debug printouts. */
276 /* On first -d, print version identification */
277 static boolean printed_version = FALSE;
278
279 if (!printed_version) {
280 fprintf(stderr, "%s version %s (build %s)\n",
281 PACKAGE_NAME, VERSION, BUILD);
282 fprintf(stderr, "%s\n\n", JCOPYRIGHT);
283 fprintf(stderr, "Emulating The Independent JPEG Group's software, version %s\n\n",
284 JVERSION);
285 printed_version = TRUE;
286 }
287 cinfo->err->trace_level++;
288
289 } else if (keymatch(arg, "version", 4)) {
290 fprintf(stderr, "%s version %s (build %s)\n",
291 PACKAGE_NAME, VERSION, BUILD);
292 exit(EXIT_SUCCESS);
293
294 } else if (keymatch(arg, "fast", 1)) {
295 /* Select recommended processing options for quick-and-dirty output. */
296 cinfo->two_pass_quantize = FALSE;
297 cinfo->dither_mode = JDITHER_ORDERED;
298 if (!cinfo->quantize_colors) /* don't override an earlier -colors */
299 cinfo->desired_number_of_colors = 216;
300 cinfo->dct_method = JDCT_FASTEST;
301 cinfo->do_fancy_upsampling = FALSE;
302
303 } else if (keymatch(arg, "gif", 1)) {
304 /* GIF output format (LZW-compressed). */
305 requested_fmt = FMT_GIF;
306
307 } else if (keymatch(arg, "gif0", 4)) {
308 /* GIF output format (uncompressed). */
309 requested_fmt = FMT_GIF0;
310
311 } else if (keymatch(arg, "grayscale", 2) ||
312 keymatch(arg, "greyscale", 2)) {
313 /* Force monochrome output. */
314 cinfo->out_color_space = JCS_GRAYSCALE;
315
316 } else if (keymatch(arg, "rgb", 2)) {
317 /* Force RGB output. */
318 cinfo->out_color_space = JCS_RGB;
319
320 } else if (keymatch(arg, "rgb565", 2)) {
321 /* Force RGB565 output. */
322 cinfo->out_color_space = JCS_RGB565;
323
324 } else if (keymatch(arg, "icc", 1)) {
325 /* Set ICC filename. */
326 if (++argn >= argc) /* advance to next argument */
327 usage();
328 icc_filename = argv[argn];
329 jpeg_save_markers(cinfo, JPEG_APP0 + 2, 0xFFFF);
330
331 } else if (keymatch(arg, "map", 3)) {
332 /* Quantize to a color map taken from an input file. */
333 if (++argn >= argc) /* advance to next argument */
334 usage();
335 if (for_real) { /* too expensive to do twice! */
336 #ifdef QUANT_2PASS_SUPPORTED /* otherwise can't quantize to supplied map */
337 FILE *mapfile;
338
339 if ((mapfile = fopen(argv[argn], READ_BINARY)) == NULL) {
340 fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]);
341 exit(EXIT_FAILURE);
342 }
343 read_color_map(cinfo, mapfile);
344 fclose(mapfile);
345 cinfo->quantize_colors = TRUE;
346 #else
347 ERREXIT(cinfo, JERR_NOT_COMPILED);
348 #endif
349 }
350
351 } else if (keymatch(arg, "maxmemory", 3)) {
352 /* Maximum memory in Kb (or Mb with 'm'). */
353 long lval;
354 char ch = 'x';
355
356 if (++argn >= argc) /* advance to next argument */
357 usage();
358 if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
359 usage();
360 if (ch == 'm' || ch == 'M')
361 lval *= 1000L;
362 cinfo->mem->max_memory_to_use = lval * 1000L;
363
364 } else if (keymatch(arg, "maxscans", 4)) {
365 if (++argn >= argc) /* advance to next argument */
366 usage();
367 if (sscanf(argv[argn], "%u", &max_scans) != 1)
368 usage();
369
370 } else if (keymatch(arg, "nosmooth", 3)) {
371 /* Suppress fancy upsampling */
372 cinfo->do_fancy_upsampling = FALSE;
373
374 } else if (keymatch(arg, "onepass", 3)) {
375 /* Use fast one-pass quantization. */
376 cinfo->two_pass_quantize = FALSE;
377
378 } else if (keymatch(arg, "os2", 3)) {
379 /* BMP output format (OS/2 flavor). */
380 requested_fmt = FMT_OS2;
381
382 } else if (keymatch(arg, "outfile", 4)) {
383 /* Set output file name. */
384 if (++argn >= argc) /* advance to next argument */
385 usage();
386 outfilename = argv[argn]; /* save it away for later use */
387
388 } else if (keymatch(arg, "memsrc", 2)) {
389 /* Use in-memory source manager */
390 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
391 memsrc = TRUE;
392 #else
393 fprintf(stderr, "%s: sorry, in-memory source manager was not compiled in\n",
394 progname);
395 exit(EXIT_FAILURE);
396 #endif
397
398 } else if (keymatch(arg, "pnm", 1) || keymatch(arg, "ppm", 1)) {
399 /* PPM/PGM output format. */
400 requested_fmt = FMT_PPM;
401
402 } else if (keymatch(arg, "report", 2)) {
403 report = TRUE;
404
405 } else if (keymatch(arg, "scale", 2)) {
406 /* Scale the output image by a fraction M/N. */
407 if (++argn >= argc) /* advance to next argument */
408 usage();
409 if (sscanf(argv[argn], "%u/%u",
410 &cinfo->scale_num, &cinfo->scale_denom) != 2)
411 usage();
412
413 } else if (keymatch(arg, "skip", 2)) {
414 if (++argn >= argc)
415 usage();
416 if (sscanf(argv[argn], "%u,%u", &skip_start, &skip_end) != 2 ||
417 skip_start > skip_end)
418 usage();
419 skip = TRUE;
420
421 } else if (keymatch(arg, "crop", 2)) {
422 char c;
423 if (++argn >= argc)
424 usage();
425 if (sscanf(argv[argn], "%u%c%u+%u+%u", &crop_width, &c, &crop_height,
426 &crop_x, &crop_y) != 5 ||
427 (c != 'X' && c != 'x') || crop_width < 1 || crop_height < 1)
428 usage();
429 crop = TRUE;
430
431 } else if (keymatch(arg, "strict", 2)) {
432 strict = TRUE;
433
434 } else if (keymatch(arg, "targa", 1)) {
435 /* Targa output format. */
436 requested_fmt = FMT_TARGA;
437
438 } else {
439 usage(); /* bogus switch */
440 }
441 }
442
443 return argn; /* return index of next arg (file name) */
444 }
445
446
447 /*
448 * Marker processor for COM and interesting APPn markers.
449 * This replaces the library's built-in processor, which just skips the marker.
450 * We want to print out the marker as text, to the extent possible.
451 * Note this code relies on a non-suspending data source.
452 */
453
454 LOCAL(unsigned int)
jpeg_getc(j_decompress_ptr cinfo)455 jpeg_getc(j_decompress_ptr cinfo)
456 /* Read next byte */
457 {
458 struct jpeg_source_mgr *datasrc = cinfo->src;
459
460 if (datasrc->bytes_in_buffer == 0) {
461 if (!(*datasrc->fill_input_buffer) (cinfo))
462 ERREXIT(cinfo, JERR_CANT_SUSPEND);
463 }
464 datasrc->bytes_in_buffer--;
465 return *datasrc->next_input_byte++;
466 }
467
468
469 METHODDEF(boolean)
print_text_marker(j_decompress_ptr cinfo)470 print_text_marker(j_decompress_ptr cinfo)
471 {
472 boolean traceit = (cinfo->err->trace_level >= 1);
473 long length;
474 unsigned int ch;
475 unsigned int lastch = 0;
476
477 length = jpeg_getc(cinfo) << 8;
478 length += jpeg_getc(cinfo);
479 length -= 2; /* discount the length word itself */
480
481 if (traceit) {
482 if (cinfo->unread_marker == JPEG_COM)
483 fprintf(stderr, "Comment, length %ld:\n", (long)length);
484 else /* assume it is an APPn otherwise */
485 fprintf(stderr, "APP%d, length %ld:\n",
486 cinfo->unread_marker - JPEG_APP0, (long)length);
487 }
488
489 while (--length >= 0) {
490 ch = jpeg_getc(cinfo);
491 if (traceit) {
492 /* Emit the character in a readable form.
493 * Nonprintables are converted to \nnn form,
494 * while \ is converted to \\.
495 * Newlines in CR, CR/LF, or LF form will be printed as one newline.
496 */
497 if (ch == '\r') {
498 fprintf(stderr, "\n");
499 } else if (ch == '\n') {
500 if (lastch != '\r')
501 fprintf(stderr, "\n");
502 } else if (ch == '\\') {
503 fprintf(stderr, "\\\\");
504 } else if (isprint(ch)) {
505 putc(ch, stderr);
506 } else {
507 fprintf(stderr, "\\%03o", ch);
508 }
509 lastch = ch;
510 }
511 }
512
513 if (traceit)
514 fprintf(stderr, "\n");
515
516 return TRUE;
517 }
518
519
520 METHODDEF(void)
my_emit_message(j_common_ptr cinfo,int msg_level)521 my_emit_message(j_common_ptr cinfo, int msg_level)
522 {
523 if (msg_level < 0) {
524 /* Treat warning as fatal */
525 cinfo->err->error_exit(cinfo);
526 } else {
527 if (cinfo->err->trace_level >= msg_level)
528 cinfo->err->output_message(cinfo);
529 }
530 }
531
532
533 /*
534 * The main program.
535 */
536
537 int
538 #ifdef GTEST
djpeg(int argc,char ** argv)539 djpeg(int argc, char **argv)
540 #else
541 main(int argc, char **argv)
542 #endif
543 {
544 struct jpeg_decompress_struct cinfo;
545 struct jpeg_error_mgr jerr;
546 struct cdjpeg_progress_mgr progress;
547 int file_index;
548 djpeg_dest_ptr dest_mgr = NULL;
549 FILE *input_file;
550 FILE *output_file;
551 unsigned char *inbuffer = NULL;
552 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
553 unsigned long insize = 0;
554 #endif
555 JDIMENSION num_scanlines;
556
557 /* On Mac, fetch a command line. */
558 #ifdef USE_CCOMMAND
559 argc = ccommand(&argv);
560 #endif
561
562 progname = argv[0];
563 if (progname == NULL || progname[0] == 0)
564 progname = "djpeg"; /* in case C library doesn't provide it */
565
566 /* Initialize the JPEG decompression object with default error handling. */
567 cinfo.err = jpeg_std_error(&jerr);
568 jpeg_create_decompress(&cinfo);
569 /* Add some application-specific error messages (from cderror.h) */
570 jerr.addon_message_table = cdjpeg_message_table;
571 jerr.first_addon_message = JMSG_FIRSTADDONCODE;
572 jerr.last_addon_message = JMSG_LASTADDONCODE;
573
574 /* Insert custom marker processor for COM and APP12.
575 * APP12 is used by some digital camera makers for textual info,
576 * so we provide the ability to display it as text.
577 * If you like, additional APPn marker types can be selected for display,
578 * but don't try to override APP0 or APP14 this way (see libjpeg.txt).
579 */
580 jpeg_set_marker_processor(&cinfo, JPEG_COM, print_text_marker);
581 jpeg_set_marker_processor(&cinfo, JPEG_APP0 + 12, print_text_marker);
582
583 /* Scan command line to find file names. */
584 /* It is convenient to use just one switch-parsing routine, but the switch
585 * values read here are ignored; we will rescan the switches after opening
586 * the input file.
587 * (Exception: tracing level set here controls verbosity for COM markers
588 * found during jpeg_read_header...)
589 */
590
591 file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
592
593 if (strict)
594 jerr.emit_message = my_emit_message;
595
596 #ifdef TWO_FILE_COMMANDLINE
597 /* Must have either -outfile switch or explicit output file name */
598 if (outfilename == NULL) {
599 if (file_index != argc - 2) {
600 fprintf(stderr, "%s: must name one input and one output file\n",
601 progname);
602 usage();
603 }
604 outfilename = argv[file_index + 1];
605 } else {
606 if (file_index != argc - 1) {
607 fprintf(stderr, "%s: must name one input and one output file\n",
608 progname);
609 usage();
610 }
611 }
612 #else
613 /* Unix style: expect zero or one file name */
614 if (file_index < argc - 1) {
615 fprintf(stderr, "%s: only one input file\n", progname);
616 usage();
617 }
618 #endif /* TWO_FILE_COMMANDLINE */
619
620 /* Open the input file. */
621 if (file_index < argc) {
622 if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
623 fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
624 return EXIT_FAILURE;
625 }
626 } else {
627 /* default input file is stdin */
628 input_file = read_stdin();
629 }
630
631 /* Open the output file. */
632 if (outfilename != NULL) {
633 if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
634 fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
635 return EXIT_FAILURE;
636 }
637 } else {
638 /* default output file is stdout */
639 output_file = write_stdout();
640 }
641
642 if (report || max_scans != 0) {
643 start_progress_monitor((j_common_ptr)&cinfo, &progress);
644 progress.report = report;
645 progress.max_scans = max_scans;
646 }
647
648 /* Specify data source for decompression */
649 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
650 if (memsrc) {
651 size_t nbytes;
652 do {
653 inbuffer = (unsigned char *)realloc(inbuffer, insize + INPUT_BUF_SIZE);
654 if (inbuffer == NULL) {
655 fprintf(stderr, "%s: memory allocation failure\n", progname);
656 return EXIT_FAILURE;
657 }
658 nbytes = JFREAD(input_file, &inbuffer[insize], INPUT_BUF_SIZE);
659 if (nbytes < INPUT_BUF_SIZE && ferror(input_file)) {
660 if (file_index < argc)
661 fprintf(stderr, "%s: can't read from %s\n", progname,
662 argv[file_index]);
663 else
664 fprintf(stderr, "%s: can't read from stdin\n", progname);
665 }
666 insize += (unsigned long)nbytes;
667 } while (nbytes == INPUT_BUF_SIZE);
668 fprintf(stderr, "Compressed size: %lu bytes\n", insize);
669 jpeg_mem_src(&cinfo, inbuffer, insize);
670 } else
671 #endif
672 jpeg_stdio_src(&cinfo, input_file);
673
674 /* Read file header, set default decompression parameters */
675 (void)jpeg_read_header(&cinfo, TRUE);
676
677 /* Adjust default decompression parameters by re-parsing the options */
678 file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
679
680 /* Initialize the output module now to let it override any crucial
681 * option settings (for instance, GIF wants to force color quantization).
682 */
683 switch (requested_fmt) {
684 #ifdef BMP_SUPPORTED
685 case FMT_BMP:
686 dest_mgr = jinit_write_bmp(&cinfo, FALSE, TRUE);
687 break;
688 case FMT_OS2:
689 dest_mgr = jinit_write_bmp(&cinfo, TRUE, TRUE);
690 break;
691 #endif
692 #ifdef GIF_SUPPORTED
693 case FMT_GIF:
694 dest_mgr = jinit_write_gif(&cinfo, TRUE);
695 break;
696 case FMT_GIF0:
697 dest_mgr = jinit_write_gif(&cinfo, FALSE);
698 break;
699 #endif
700 #ifdef PPM_SUPPORTED
701 case FMT_PPM:
702 dest_mgr = jinit_write_ppm(&cinfo);
703 break;
704 #endif
705 #ifdef TARGA_SUPPORTED
706 case FMT_TARGA:
707 dest_mgr = jinit_write_targa(&cinfo);
708 break;
709 #endif
710 default:
711 ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT);
712 break;
713 }
714 dest_mgr->output_file = output_file;
715
716 /* Start decompressor */
717 (void)jpeg_start_decompress(&cinfo);
718
719 /* Skip rows */
720 if (skip) {
721 JDIMENSION tmp;
722
723 /* Check for valid skip_end. We cannot check this value until after
724 * jpeg_start_decompress() is called. Note that we have already verified
725 * that skip_start <= skip_end.
726 */
727 if (skip_end > cinfo.output_height - 1) {
728 fprintf(stderr, "%s: skip region exceeds image height %d\n", progname,
729 cinfo.output_height);
730 return EXIT_FAILURE;
731 }
732
733 /* Write output file header. This is a hack to ensure that the destination
734 * manager creates an output image of the proper size.
735 */
736 tmp = cinfo.output_height;
737 cinfo.output_height -= (skip_end - skip_start + 1);
738 (*dest_mgr->start_output) (&cinfo, dest_mgr);
739 cinfo.output_height = tmp;
740
741 /* Process data */
742 while (cinfo.output_scanline < skip_start) {
743 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
744 dest_mgr->buffer_height);
745 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
746 }
747 if ((tmp = jpeg_skip_scanlines(&cinfo, skip_end - skip_start + 1)) !=
748 skip_end - skip_start + 1) {
749 fprintf(stderr, "%s: jpeg_skip_scanlines() returned %d rather than %d\n",
750 progname, tmp, skip_end - skip_start + 1);
751 return EXIT_FAILURE;
752 }
753 while (cinfo.output_scanline < cinfo.output_height) {
754 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
755 dest_mgr->buffer_height);
756 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
757 }
758
759 /* Decompress a subregion */
760 } else if (crop) {
761 JDIMENSION tmp;
762
763 /* Check for valid crop dimensions. We cannot check these values until
764 * after jpeg_start_decompress() is called.
765 */
766 if (crop_x + crop_width > cinfo.output_width ||
767 crop_y + crop_height > cinfo.output_height) {
768 fprintf(stderr, "%s: crop dimensions exceed image dimensions %d x %d\n",
769 progname, cinfo.output_width, cinfo.output_height);
770 return EXIT_FAILURE;
771 }
772
773 jpeg_crop_scanline(&cinfo, &crop_x, &crop_width);
774 if (dest_mgr->calc_buffer_dimensions)
775 (*dest_mgr->calc_buffer_dimensions) (&cinfo, dest_mgr);
776 else
777 ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT);
778
779 /* Write output file header. This is a hack to ensure that the destination
780 * manager creates an output image of the proper size.
781 */
782 tmp = cinfo.output_height;
783 cinfo.output_height = crop_height;
784 (*dest_mgr->start_output) (&cinfo, dest_mgr);
785 cinfo.output_height = tmp;
786
787 /* Process data */
788 if ((tmp = jpeg_skip_scanlines(&cinfo, crop_y)) != crop_y) {
789 fprintf(stderr, "%s: jpeg_skip_scanlines() returned %d rather than %d\n",
790 progname, tmp, crop_y);
791 return EXIT_FAILURE;
792 }
793 while (cinfo.output_scanline < crop_y + crop_height) {
794 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
795 dest_mgr->buffer_height);
796 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
797 }
798 if ((tmp =
799 jpeg_skip_scanlines(&cinfo,
800 cinfo.output_height - crop_y - crop_height)) !=
801 cinfo.output_height - crop_y - crop_height) {
802 fprintf(stderr, "%s: jpeg_skip_scanlines() returned %d rather than %d\n",
803 progname, tmp, cinfo.output_height - crop_y - crop_height);
804 return EXIT_FAILURE;
805 }
806
807 /* Normal full-image decompress */
808 } else {
809 /* Write output file header */
810 (*dest_mgr->start_output) (&cinfo, dest_mgr);
811
812 /* Process data */
813 while (cinfo.output_scanline < cinfo.output_height) {
814 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
815 dest_mgr->buffer_height);
816 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
817 }
818 }
819
820 /* Hack: count final pass as done in case finish_output does an extra pass.
821 * The library won't have updated completed_passes.
822 */
823 if (report || max_scans != 0)
824 progress.pub.completed_passes = progress.pub.total_passes;
825
826 if (icc_filename != NULL) {
827 FILE *icc_file;
828 JOCTET *icc_profile;
829 unsigned int icc_len;
830
831 if ((icc_file = fopen(icc_filename, WRITE_BINARY)) == NULL) {
832 fprintf(stderr, "%s: can't open %s\n", progname, icc_filename);
833 return EXIT_FAILURE;
834 }
835 if (jpeg_read_icc_profile(&cinfo, &icc_profile, &icc_len)) {
836 if (fwrite(icc_profile, icc_len, 1, icc_file) < 1) {
837 fprintf(stderr, "%s: can't read ICC profile from %s\n", progname,
838 icc_filename);
839 free(icc_profile);
840 fclose(icc_file);
841 return EXIT_FAILURE;
842 }
843 free(icc_profile);
844 fclose(icc_file);
845 } else if (cinfo.err->msg_code != JWRN_BOGUS_ICC)
846 fprintf(stderr, "%s: no ICC profile data in JPEG file\n", progname);
847 }
848
849 /* Finish decompression and release memory.
850 * I must do it in this order because output module has allocated memory
851 * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory.
852 */
853 (*dest_mgr->finish_output) (&cinfo, dest_mgr);
854 (void)jpeg_finish_decompress(&cinfo);
855 jpeg_destroy_decompress(&cinfo);
856
857 /* Close files, if we opened them */
858 if (input_file != stdin)
859 fclose(input_file);
860 if (output_file != stdout)
861 fclose(output_file);
862
863 if (report || max_scans != 0)
864 end_progress_monitor((j_common_ptr)&cinfo);
865
866 if (memsrc)
867 free(inbuffer);
868
869 /* All done. */
870 return (jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
871 }
872