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, 2013-2017, 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 */
72 FMT_OS2, /* BMP format (OS/2 flavor) */
73 FMT_PPM, /* PPM/PGM (PBMPLUS formats) */
74 FMT_RLE, /* RLE format */
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 char *outfilename; /* for -outfile switch */
98 boolean memsrc; /* for -memsrc switch */
99 boolean skip, crop;
100 JDIMENSION skip_start, skip_end;
101 JDIMENSION crop_x, crop_y, crop_width, crop_height;
102 #define INPUT_BUF_SIZE 4096
103
104
105 LOCAL(void)
usage(void)106 usage(void)
107 /* complain about bad command line */
108 {
109 fprintf(stderr, "usage: %s [switches] ", progname);
110 #ifdef TWO_FILE_COMMANDLINE
111 fprintf(stderr, "inputfile outputfile\n");
112 #else
113 fprintf(stderr, "[inputfile]\n");
114 #endif
115
116 fprintf(stderr, "Switches (names may be abbreviated):\n");
117 fprintf(stderr, " -colors N Reduce image to no more than N colors\n");
118 fprintf(stderr, " -fast Fast, low-quality processing\n");
119 fprintf(stderr, " -grayscale Force grayscale output\n");
120 fprintf(stderr, " -rgb Force RGB output\n");
121 fprintf(stderr, " -rgb565 Force RGB565 output\n");
122 #ifdef IDCT_SCALING_SUPPORTED
123 fprintf(stderr, " -scale M/N Scale output image by fraction M/N, eg, 1/8\n");
124 #endif
125 #ifdef BMP_SUPPORTED
126 fprintf(stderr, " -bmp Select BMP output format (Windows style)%s\n",
127 (DEFAULT_FMT == FMT_BMP ? " (default)" : ""));
128 #endif
129 #ifdef GIF_SUPPORTED
130 fprintf(stderr, " -gif Select GIF output format%s\n",
131 (DEFAULT_FMT == FMT_GIF ? " (default)" : ""));
132 #endif
133 #ifdef BMP_SUPPORTED
134 fprintf(stderr, " -os2 Select BMP output format (OS/2 style)%s\n",
135 (DEFAULT_FMT == FMT_OS2 ? " (default)" : ""));
136 #endif
137 #ifdef PPM_SUPPORTED
138 fprintf(stderr, " -pnm Select PBMPLUS (PPM/PGM) output format%s\n",
139 (DEFAULT_FMT == FMT_PPM ? " (default)" : ""));
140 #endif
141 #ifdef RLE_SUPPORTED
142 fprintf(stderr, " -rle Select Utah RLE output format%s\n",
143 (DEFAULT_FMT == FMT_RLE ? " (default)" : ""));
144 #endif
145 #ifdef TARGA_SUPPORTED
146 fprintf(stderr, " -targa Select Targa output format%s\n",
147 (DEFAULT_FMT == FMT_TARGA ? " (default)" : ""));
148 #endif
149 fprintf(stderr, "Switches for advanced users:\n");
150 #ifdef DCT_ISLOW_SUPPORTED
151 fprintf(stderr, " -dct int Use integer DCT method%s\n",
152 (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
153 #endif
154 #ifdef DCT_IFAST_SUPPORTED
155 fprintf(stderr, " -dct fast Use fast integer DCT (less accurate)%s\n",
156 (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
157 #endif
158 #ifdef DCT_FLOAT_SUPPORTED
159 fprintf(stderr, " -dct float Use floating-point DCT method%s\n",
160 (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
161 #endif
162 fprintf(stderr, " -dither fs Use F-S dithering (default)\n");
163 fprintf(stderr, " -dither none Don't use dithering in quantization\n");
164 fprintf(stderr, " -dither ordered Use ordered dither (medium speed, quality)\n");
165 fprintf(stderr, " -icc FILE Extract ICC profile to FILE\n");
166 #ifdef QUANT_2PASS_SUPPORTED
167 fprintf(stderr, " -map FILE Map to colors used in named image file\n");
168 #endif
169 fprintf(stderr, " -nosmooth Don't use high-quality upsampling\n");
170 #ifdef QUANT_1PASS_SUPPORTED
171 fprintf(stderr, " -onepass Use 1-pass quantization (fast, low quality)\n");
172 #endif
173 fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n");
174 fprintf(stderr, " -outfile name Specify name for output file\n");
175 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
176 fprintf(stderr, " -memsrc Load input file into memory before decompressing\n");
177 #endif
178
179 fprintf(stderr, " -skip Y0,Y1 Decompress all rows except those between Y0 and Y1 (inclusive)\n");
180 fprintf(stderr, " -crop WxH+X+Y Decompress only a rectangular subregion of the image\n");
181 fprintf(stderr, " [requires PBMPLUS (PPM/PGM), GIF, or Targa output format]\n");
182 fprintf(stderr, " -verbose or -debug Emit debug output\n");
183 fprintf(stderr, " -version Print version information and exit\n");
184 exit(EXIT_FAILURE);
185 }
186
187
188 LOCAL(int)
parse_switches(j_decompress_ptr cinfo,int argc,char ** argv,int last_file_arg_seen,boolean for_real)189 parse_switches(j_decompress_ptr cinfo, int argc, char **argv,
190 int last_file_arg_seen, boolean for_real)
191 /* Parse optional switches.
192 * Returns argv[] index of first file-name argument (== argc if none).
193 * Any file names with indexes <= last_file_arg_seen are ignored;
194 * they have presumably been processed in a previous iteration.
195 * (Pass 0 for last_file_arg_seen on the first or only iteration.)
196 * for_real is FALSE on the first (dummy) pass; we may skip any expensive
197 * processing.
198 */
199 {
200 int argn;
201 char *arg;
202
203 /* Set up default JPEG parameters. */
204 requested_fmt = DEFAULT_FMT; /* set default output file format */
205 icc_filename = NULL;
206 outfilename = NULL;
207 memsrc = FALSE;
208 skip = FALSE;
209 crop = FALSE;
210 cinfo->err->trace_level = 0;
211
212 /* Scan command line options, adjust parameters */
213
214 for (argn = 1; argn < argc; argn++) {
215 arg = argv[argn];
216 if (*arg != '-') {
217 /* Not a switch, must be a file name argument */
218 if (argn <= last_file_arg_seen) {
219 outfilename = NULL; /* -outfile applies to just one input file */
220 continue; /* ignore this name if previously processed */
221 }
222 break; /* else done parsing switches */
223 }
224 arg++; /* advance past switch marker character */
225
226 if (keymatch(arg, "bmp", 1)) {
227 /* BMP output format. */
228 requested_fmt = FMT_BMP;
229
230 } else if (keymatch(arg, "colors", 1) || keymatch(arg, "colours", 1) ||
231 keymatch(arg, "quantize", 1) || keymatch(arg, "quantise", 1)) {
232 /* Do color quantization. */
233 int val;
234
235 if (++argn >= argc) /* advance to next argument */
236 usage();
237 if (sscanf(argv[argn], "%d", &val) != 1)
238 usage();
239 cinfo->desired_number_of_colors = val;
240 cinfo->quantize_colors = TRUE;
241
242 } else if (keymatch(arg, "dct", 2)) {
243 /* Select IDCT algorithm. */
244 if (++argn >= argc) /* advance to next argument */
245 usage();
246 if (keymatch(argv[argn], "int", 1)) {
247 cinfo->dct_method = JDCT_ISLOW;
248 } else if (keymatch(argv[argn], "fast", 2)) {
249 cinfo->dct_method = JDCT_IFAST;
250 } else if (keymatch(argv[argn], "float", 2)) {
251 cinfo->dct_method = JDCT_FLOAT;
252 } else
253 usage();
254
255 } else if (keymatch(arg, "dither", 2)) {
256 /* Select dithering algorithm. */
257 if (++argn >= argc) /* advance to next argument */
258 usage();
259 if (keymatch(argv[argn], "fs", 2)) {
260 cinfo->dither_mode = JDITHER_FS;
261 } else if (keymatch(argv[argn], "none", 2)) {
262 cinfo->dither_mode = JDITHER_NONE;
263 } else if (keymatch(argv[argn], "ordered", 2)) {
264 cinfo->dither_mode = JDITHER_ORDERED;
265 } else
266 usage();
267
268 } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
269 /* Enable debug printouts. */
270 /* On first -d, print version identification */
271 static boolean printed_version = FALSE;
272
273 if (!printed_version) {
274 fprintf(stderr, "%s version %s (build %s)\n",
275 PACKAGE_NAME, VERSION, BUILD);
276 fprintf(stderr, "%s\n\n", JCOPYRIGHT);
277 fprintf(stderr, "Emulating The Independent JPEG Group's software, version %s\n\n",
278 JVERSION);
279 printed_version = TRUE;
280 }
281 cinfo->err->trace_level++;
282
283 } else if (keymatch(arg, "version", 4)) {
284 fprintf(stderr, "%s version %s (build %s)\n",
285 PACKAGE_NAME, VERSION, BUILD);
286 exit(EXIT_SUCCESS);
287
288 } else if (keymatch(arg, "fast", 1)) {
289 /* Select recommended processing options for quick-and-dirty output. */
290 cinfo->two_pass_quantize = FALSE;
291 cinfo->dither_mode = JDITHER_ORDERED;
292 if (!cinfo->quantize_colors) /* don't override an earlier -colors */
293 cinfo->desired_number_of_colors = 216;
294 cinfo->dct_method = JDCT_FASTEST;
295 cinfo->do_fancy_upsampling = FALSE;
296
297 } else if (keymatch(arg, "gif", 1)) {
298 /* GIF output format. */
299 requested_fmt = FMT_GIF;
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 jpeg_save_markers(cinfo, JPEG_APP0 + 2, 0xFFFF);
320
321 } else if (keymatch(arg, "map", 3)) {
322 /* Quantize to a color map taken from an input file. */
323 if (++argn >= argc) /* advance to next argument */
324 usage();
325 if (for_real) { /* too expensive to do twice! */
326 #ifdef QUANT_2PASS_SUPPORTED /* otherwise can't quantize to supplied map */
327 FILE *mapfile;
328
329 if ((mapfile = fopen(argv[argn], READ_BINARY)) == NULL) {
330 fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]);
331 exit(EXIT_FAILURE);
332 }
333 read_color_map(cinfo, mapfile);
334 fclose(mapfile);
335 cinfo->quantize_colors = TRUE;
336 #else
337 ERREXIT(cinfo, JERR_NOT_COMPILED);
338 #endif
339 }
340
341 } else if (keymatch(arg, "maxmemory", 3)) {
342 /* Maximum memory in Kb (or Mb with 'm'). */
343 long lval;
344 char ch = 'x';
345
346 if (++argn >= argc) /* advance to next argument */
347 usage();
348 if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
349 usage();
350 if (ch == 'm' || ch == 'M')
351 lval *= 1000L;
352 cinfo->mem->max_memory_to_use = lval * 1000L;
353
354 } else if (keymatch(arg, "nosmooth", 3)) {
355 /* Suppress fancy upsampling */
356 cinfo->do_fancy_upsampling = FALSE;
357
358 } else if (keymatch(arg, "onepass", 3)) {
359 /* Use fast one-pass quantization. */
360 cinfo->two_pass_quantize = FALSE;
361
362 } else if (keymatch(arg, "os2", 3)) {
363 /* BMP output format (OS/2 flavor). */
364 requested_fmt = FMT_OS2;
365
366 } else if (keymatch(arg, "outfile", 4)) {
367 /* Set output file name. */
368 if (++argn >= argc) /* advance to next argument */
369 usage();
370 outfilename = argv[argn]; /* save it away for later use */
371
372 } else if (keymatch(arg, "memsrc", 2)) {
373 /* Use in-memory source manager */
374 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
375 memsrc = TRUE;
376 #else
377 fprintf(stderr, "%s: sorry, in-memory source manager was not compiled in\n",
378 progname);
379 exit(EXIT_FAILURE);
380 #endif
381
382 } else if (keymatch(arg, "pnm", 1) || keymatch(arg, "ppm", 1)) {
383 /* PPM/PGM output format. */
384 requested_fmt = FMT_PPM;
385
386 } else if (keymatch(arg, "rle", 1)) {
387 /* RLE output format. */
388 requested_fmt = FMT_RLE;
389
390 } else if (keymatch(arg, "scale", 2)) {
391 /* Scale the output image by a fraction M/N. */
392 if (++argn >= argc) /* advance to next argument */
393 usage();
394 if (sscanf(argv[argn], "%u/%u",
395 &cinfo->scale_num, &cinfo->scale_denom) != 2)
396 usage();
397
398 } else if (keymatch(arg, "skip", 2)) {
399 if (++argn >= argc)
400 usage();
401 if (sscanf(argv[argn], "%u,%u", &skip_start, &skip_end) != 2 ||
402 skip_start > skip_end)
403 usage();
404 skip = TRUE;
405
406 } else if (keymatch(arg, "crop", 2)) {
407 char c;
408 if (++argn >= argc)
409 usage();
410 if (sscanf(argv[argn], "%u%c%u+%u+%u", &crop_width, &c, &crop_height,
411 &crop_x, &crop_y) != 5 ||
412 (c != 'X' && c != 'x') || crop_width < 1 || crop_height < 1)
413 usage();
414 crop = TRUE;
415
416 } else if (keymatch(arg, "targa", 1)) {
417 /* Targa output format. */
418 requested_fmt = FMT_TARGA;
419
420 } else {
421 usage(); /* bogus switch */
422 }
423 }
424
425 return argn; /* return index of next arg (file name) */
426 }
427
428
429 /*
430 * Marker processor for COM and interesting APPn markers.
431 * This replaces the library's built-in processor, which just skips the marker.
432 * We want to print out the marker as text, to the extent possible.
433 * Note this code relies on a non-suspending data source.
434 */
435
436 LOCAL(unsigned int)
jpeg_getc(j_decompress_ptr cinfo)437 jpeg_getc(j_decompress_ptr cinfo)
438 /* Read next byte */
439 {
440 struct jpeg_source_mgr *datasrc = cinfo->src;
441
442 if (datasrc->bytes_in_buffer == 0) {
443 if (!(*datasrc->fill_input_buffer) (cinfo))
444 ERREXIT(cinfo, JERR_CANT_SUSPEND);
445 }
446 datasrc->bytes_in_buffer--;
447 return GETJOCTET(*datasrc->next_input_byte++);
448 }
449
450
451 METHODDEF(boolean)
print_text_marker(j_decompress_ptr cinfo)452 print_text_marker(j_decompress_ptr cinfo)
453 {
454 boolean traceit = (cinfo->err->trace_level >= 1);
455 long length;
456 unsigned int ch;
457 unsigned int lastch = 0;
458
459 length = jpeg_getc(cinfo) << 8;
460 length += jpeg_getc(cinfo);
461 length -= 2; /* discount the length word itself */
462
463 if (traceit) {
464 if (cinfo->unread_marker == JPEG_COM)
465 fprintf(stderr, "Comment, length %ld:\n", (long)length);
466 else /* assume it is an APPn otherwise */
467 fprintf(stderr, "APP%d, length %ld:\n",
468 cinfo->unread_marker - JPEG_APP0, (long)length);
469 }
470
471 while (--length >= 0) {
472 ch = jpeg_getc(cinfo);
473 if (traceit) {
474 /* Emit the character in a readable form.
475 * Nonprintables are converted to \nnn form,
476 * while \ is converted to \\.
477 * Newlines in CR, CR/LF, or LF form will be printed as one newline.
478 */
479 if (ch == '\r') {
480 fprintf(stderr, "\n");
481 } else if (ch == '\n') {
482 if (lastch != '\r')
483 fprintf(stderr, "\n");
484 } else if (ch == '\\') {
485 fprintf(stderr, "\\\\");
486 } else if (isprint(ch)) {
487 putc(ch, stderr);
488 } else {
489 fprintf(stderr, "\\%03o", ch);
490 }
491 lastch = ch;
492 }
493 }
494
495 if (traceit)
496 fprintf(stderr, "\n");
497
498 return TRUE;
499 }
500
501
502 /*
503 * The main program.
504 */
505
506 int
main(int argc,char ** argv)507 main(int argc, char **argv)
508 {
509 struct jpeg_decompress_struct cinfo;
510 struct jpeg_error_mgr jerr;
511 #ifdef PROGRESS_REPORT
512 struct cdjpeg_progress_mgr progress;
513 #endif
514 int file_index;
515 djpeg_dest_ptr dest_mgr = NULL;
516 FILE *input_file;
517 FILE *output_file;
518 unsigned char *inbuffer = NULL;
519 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
520 unsigned long insize = 0;
521 #endif
522 JDIMENSION num_scanlines;
523
524 /* On Mac, fetch a command line. */
525 #ifdef USE_CCOMMAND
526 argc = ccommand(&argv);
527 #endif
528
529 progname = argv[0];
530 if (progname == NULL || progname[0] == 0)
531 progname = "djpeg"; /* in case C library doesn't provide it */
532
533 /* Initialize the JPEG decompression object with default error handling. */
534 cinfo.err = jpeg_std_error(&jerr);
535 jpeg_create_decompress(&cinfo);
536 /* Add some application-specific error messages (from cderror.h) */
537 jerr.addon_message_table = cdjpeg_message_table;
538 jerr.first_addon_message = JMSG_FIRSTADDONCODE;
539 jerr.last_addon_message = JMSG_LASTADDONCODE;
540
541 /* Insert custom marker processor for COM and APP12.
542 * APP12 is used by some digital camera makers for textual info,
543 * so we provide the ability to display it as text.
544 * If you like, additional APPn marker types can be selected for display,
545 * but don't try to override APP0 or APP14 this way (see libjpeg.txt).
546 */
547 jpeg_set_marker_processor(&cinfo, JPEG_COM, print_text_marker);
548 jpeg_set_marker_processor(&cinfo, JPEG_APP0 + 12, print_text_marker);
549
550 /* Scan command line to find file names. */
551 /* It is convenient to use just one switch-parsing routine, but the switch
552 * values read here are ignored; we will rescan the switches after opening
553 * the input file.
554 * (Exception: tracing level set here controls verbosity for COM markers
555 * found during jpeg_read_header...)
556 */
557
558 file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
559
560 #ifdef TWO_FILE_COMMANDLINE
561 /* Must have either -outfile switch or explicit output file name */
562 if (outfilename == NULL) {
563 if (file_index != argc - 2) {
564 fprintf(stderr, "%s: must name one input and one output file\n",
565 progname);
566 usage();
567 }
568 outfilename = argv[file_index + 1];
569 } else {
570 if (file_index != argc - 1) {
571 fprintf(stderr, "%s: must name one input and one output file\n",
572 progname);
573 usage();
574 }
575 }
576 #else
577 /* Unix style: expect zero or one file name */
578 if (file_index < argc - 1) {
579 fprintf(stderr, "%s: only one input file\n", progname);
580 usage();
581 }
582 #endif /* TWO_FILE_COMMANDLINE */
583
584 /* Open the input file. */
585 if (file_index < argc) {
586 if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
587 fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
588 exit(EXIT_FAILURE);
589 }
590 } else {
591 /* default input file is stdin */
592 input_file = read_stdin();
593 }
594
595 /* Open the output file. */
596 if (outfilename != NULL) {
597 if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
598 fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
599 exit(EXIT_FAILURE);
600 }
601 } else {
602 /* default output file is stdout */
603 output_file = write_stdout();
604 }
605
606 #ifdef PROGRESS_REPORT
607 start_progress_monitor((j_common_ptr)&cinfo, &progress);
608 #endif
609
610 /* Specify data source for decompression */
611 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
612 if (memsrc) {
613 size_t nbytes;
614 do {
615 inbuffer = (unsigned char *)realloc(inbuffer, insize + INPUT_BUF_SIZE);
616 if (inbuffer == NULL) {
617 fprintf(stderr, "%s: memory allocation failure\n", progname);
618 exit(EXIT_FAILURE);
619 }
620 nbytes = JFREAD(input_file, &inbuffer[insize], INPUT_BUF_SIZE);
621 if (nbytes < INPUT_BUF_SIZE && ferror(input_file)) {
622 if (file_index < argc)
623 fprintf(stderr, "%s: can't read from %s\n", progname,
624 argv[file_index]);
625 else
626 fprintf(stderr, "%s: can't read from stdin\n", progname);
627 }
628 insize += (unsigned long)nbytes;
629 } while (nbytes == INPUT_BUF_SIZE);
630 fprintf(stderr, "Compressed size: %lu bytes\n", insize);
631 jpeg_mem_src(&cinfo, inbuffer, insize);
632 } else
633 #endif
634 jpeg_stdio_src(&cinfo, input_file);
635
636 /* Read file header, set default decompression parameters */
637 (void)jpeg_read_header(&cinfo, TRUE);
638
639 /* Adjust default decompression parameters by re-parsing the options */
640 file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
641
642 /* Initialize the output module now to let it override any crucial
643 * option settings (for instance, GIF wants to force color quantization).
644 */
645 switch (requested_fmt) {
646 #ifdef BMP_SUPPORTED
647 case FMT_BMP:
648 dest_mgr = jinit_write_bmp(&cinfo, FALSE, TRUE);
649 break;
650 case FMT_OS2:
651 dest_mgr = jinit_write_bmp(&cinfo, TRUE, TRUE);
652 break;
653 #endif
654 #ifdef GIF_SUPPORTED
655 case FMT_GIF:
656 dest_mgr = jinit_write_gif(&cinfo);
657 break;
658 #endif
659 #ifdef PPM_SUPPORTED
660 case FMT_PPM:
661 dest_mgr = jinit_write_ppm(&cinfo);
662 break;
663 #endif
664 #ifdef RLE_SUPPORTED
665 case FMT_RLE:
666 dest_mgr = jinit_write_rle(&cinfo);
667 break;
668 #endif
669 #ifdef TARGA_SUPPORTED
670 case FMT_TARGA:
671 dest_mgr = jinit_write_targa(&cinfo);
672 break;
673 #endif
674 default:
675 ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT);
676 break;
677 }
678 dest_mgr->output_file = output_file;
679
680 /* Start decompressor */
681 (void)jpeg_start_decompress(&cinfo);
682
683 /* Skip rows */
684 if (skip) {
685 JDIMENSION tmp;
686
687 /* Check for valid skip_end. We cannot check this value until after
688 * jpeg_start_decompress() is called. Note that we have already verified
689 * that skip_start <= skip_end.
690 */
691 if (skip_end > cinfo.output_height - 1) {
692 fprintf(stderr, "%s: skip region exceeds image height %d\n", progname,
693 cinfo.output_height);
694 exit(EXIT_FAILURE);
695 }
696
697 /* Write output file header. This is a hack to ensure that the destination
698 * manager creates an output image of the proper size.
699 */
700 tmp = cinfo.output_height;
701 cinfo.output_height -= (skip_end - skip_start + 1);
702 (*dest_mgr->start_output) (&cinfo, dest_mgr);
703 cinfo.output_height = tmp;
704
705 /* Process data */
706 while (cinfo.output_scanline < skip_start) {
707 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
708 dest_mgr->buffer_height);
709 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
710 }
711 jpeg_skip_scanlines(&cinfo, skip_end - skip_start + 1);
712 while (cinfo.output_scanline < cinfo.output_height) {
713 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
714 dest_mgr->buffer_height);
715 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
716 }
717
718 /* Decompress a subregion */
719 } else if (crop) {
720 JDIMENSION tmp;
721
722 /* Check for valid crop dimensions. We cannot check these values until
723 * after jpeg_start_decompress() is called.
724 */
725 if (crop_x + crop_width > cinfo.output_width ||
726 crop_y + crop_height > cinfo.output_height) {
727 fprintf(stderr, "%s: crop dimensions exceed image dimensions %d x %d\n",
728 progname, cinfo.output_width, cinfo.output_height);
729 exit(EXIT_FAILURE);
730 }
731
732 jpeg_crop_scanline(&cinfo, &crop_x, &crop_width);
733 if (dest_mgr->calc_buffer_dimensions)
734 (*dest_mgr->calc_buffer_dimensions) (&cinfo, dest_mgr);
735 else
736 ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT);
737
738 /* Write output file header. This is a hack to ensure that the destination
739 * manager creates an output image of the proper size.
740 */
741 tmp = cinfo.output_height;
742 cinfo.output_height = crop_height;
743 (*dest_mgr->start_output) (&cinfo, dest_mgr);
744 cinfo.output_height = tmp;
745
746 /* Process data */
747 jpeg_skip_scanlines(&cinfo, crop_y);
748 while (cinfo.output_scanline < crop_y + crop_height) {
749 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
750 dest_mgr->buffer_height);
751 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
752 }
753 jpeg_skip_scanlines(&cinfo, cinfo.output_height - crop_y - crop_height);
754
755 /* Normal full-image decompress */
756 } else {
757 /* Write output file header */
758 (*dest_mgr->start_output) (&cinfo, dest_mgr);
759
760 /* Process data */
761 while (cinfo.output_scanline < cinfo.output_height) {
762 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
763 dest_mgr->buffer_height);
764 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
765 }
766 }
767
768 #ifdef PROGRESS_REPORT
769 /* Hack: count final pass as done in case finish_output does an extra pass.
770 * The library won't have updated completed_passes.
771 */
772 progress.pub.completed_passes = progress.pub.total_passes;
773 #endif
774
775 if (icc_filename != NULL) {
776 FILE *icc_file;
777 JOCTET *icc_profile;
778 unsigned int icc_len;
779
780 if ((icc_file = fopen(icc_filename, WRITE_BINARY)) == NULL) {
781 fprintf(stderr, "%s: can't open %s\n", progname, icc_filename);
782 exit(EXIT_FAILURE);
783 }
784 if (jpeg_read_icc_profile(&cinfo, &icc_profile, &icc_len)) {
785 if (fwrite(icc_profile, icc_len, 1, icc_file) < 1) {
786 fprintf(stderr, "%s: can't read ICC profile from %s\n", progname,
787 icc_filename);
788 free(icc_profile);
789 fclose(icc_file);
790 exit(EXIT_FAILURE);
791 }
792 free(icc_profile);
793 fclose(icc_file);
794 } else if (cinfo.err->msg_code != JWRN_BOGUS_ICC)
795 fprintf(stderr, "%s: no ICC profile data in JPEG file\n", progname);
796 }
797
798 /* Finish decompression and release memory.
799 * I must do it in this order because output module has allocated memory
800 * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory.
801 */
802 (*dest_mgr->finish_output) (&cinfo, dest_mgr);
803 (void)jpeg_finish_decompress(&cinfo);
804 jpeg_destroy_decompress(&cinfo);
805
806 /* Close files, if we opened them */
807 if (input_file != stdin)
808 fclose(input_file);
809 if (output_file != stdout)
810 fclose(output_file);
811
812 #ifdef PROGRESS_REPORT
813 end_progress_monitor((j_common_ptr)&cinfo);
814 #endif
815
816 if (memsrc)
817 free(inbuffer);
818
819 /* All done. */
820 exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
821 return 0; /* suppress no-return-value warnings */
822 }
823