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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