compiler/libjpeg/test/djpeg.c

   1 /*
   2     $Id$
   3 */
   4
   5 /*
   6  * djpeg.c
   7  *
   8  * Copyright (C) 1991-1997, Thomas G. Lane.
   9  * This file is part of the Independent JPEG Group's software.
  10  * For conditions of distribution and use, see the accompanying README file.
  11  *
  12  * This file contains a command-line user interface for the JPEG decompressor.
  13  * It should work on any system with Unix- or MS-DOS-style command lines.
  14  *
  15  * Two different command line styles are permitted, depending on the
  16  * compile-time switch TWO_FILE_COMMANDLINE:
  17  *      djpeg [options]  inputfile outputfile
  18  *      djpeg [options]  [inputfile]
  19  * In the second style, output is always to standard output, which you'd
  20  * normally redirect to a file or pipe to some other program.  Input is
  21  * either from a named file or from standard input (typically redirected).
  22  * The second style is convenient on Unix but is unhelpful on systems that
  23  * don't support pipes.  Also, you MUST use the first style if your system
  24  * doesn't do binary I/O to stdin/stdout.
  25  * To simplify script writing, the "-outfile" switch is provided.  The syntax
  26  *      djpeg [options]  -outfile outputfile  inputfile
  27  * works regardless of which command line style is used.
  28  */
  29
  30 #include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */
  31 #include "jversion.h"           /* for version message */
  32
  33 #include <ctype.h>              /* to declare isprint() */
  34
  35 #ifdef USE_CCOMMAND             /* command-line reader for Macintosh */
  36 #ifdef __MWERKS__
  37 #include <SIOUX.h>              /* Metrowerks needs this */
  38 #include <console.h>            /* ... and this */
  39 #endif
  40 #ifdef THINK_C
  41 #include <console.h>            /* Think declares it here */
  42 #endif
  43 #endif
  44
  45
  46 /* Create the add-on message string table. */
  47
  48 #define JMESSAGE(code,string)   string ,
  49
  50 static const char * const cdjpeg_message_table[] = {
  51 #include "cderror.h"
  52   NULL
  53 };
  54
  55
  56 /*
  57  * This list defines the known output image formats
  58  * (not all of which need be supported by a given version).
  59  * You can change the default output format by defining DEFAULT_FMT;
  60  * indeed, you had better do so if you undefine PPM_SUPPORTED.
  61  */
  62
  63 typedef enum {
  64         FMT_BMP,                /* BMP format (Windows flavor) */
  65         FMT_GIF,                /* GIF format */
  66         FMT_OS2,                /* BMP format (OS/2 flavor) */
  67         FMT_PPM,                /* PPM/PGM (PBMPLUS formats) */
  68         FMT_RLE,                /* RLE format */
  69         FMT_TARGA,              /* Targa format */
  70         FMT_TIFF                /* TIFF format */
  71 } IMAGE_FORMATS;
  72
  73 #ifndef DEFAULT_FMT             /* so can override from CFLAGS in Makefile */
  74 #define DEFAULT_FMT     FMT_PPM
  75 #endif
  76
  77 static IMAGE_FORMATS requested_fmt;
  78
  79
  80 /*
  81  * Argument-parsing code.
  82  * The switch parser is designed to be useful with DOS-style command line
  83  * syntax, ie, intermixed switches and file names, where only the switches
  84  * to the left of a given file name affect processing of that file.
  85  * The main program in this file doesn't actually use this capability...
  86  */
  87
  88
  89 static const char * progname;   /* program name for error messages */
  90 static char * outfilename;      /* for -outfile switch */
  91
  92
  93 LOCAL(void)
  94 usage (void)
  95 /* complain about bad command line */
  96 {
  97   fprintf(stderr, "usage: %s [switches] ", progname);
  98 #ifdef TWO_FILE_COMMANDLINE
  99   fprintf(stderr, "inputfile outputfile\n");
 100 #else
 101   fprintf(stderr, "[inputfile]\n");
 102 #endif
 103
 104   fprintf(stderr, "Switches (names may be abbreviated):\n");
 105   fprintf(stderr, "  -colors N      Reduce image to no more than N colors\n");
 106   fprintf(stderr, "  -fast          Fast, low-quality processing\n");
 107   fprintf(stderr, "  -grayscale     Force grayscale output\n");
 108 #ifdef IDCT_SCALING_SUPPORTED
 109   fprintf(stderr, "  -scale M/N     Scale output image by fraction M/N, eg, 1/8\n");
 110 #endif
 111 #ifdef BMP_SUPPORTED
 112   fprintf(stderr, "  -bmp           Select BMP output format (Windows style)%s\n",
 113           (DEFAULT_FMT == FMT_BMP ? " (default)" : ""));
 114 #endif
 115 #ifdef GIF_SUPPORTED
 116   fprintf(stderr, "  -gif           Select GIF output format%s\n",
 117           (DEFAULT_FMT == FMT_GIF ? " (default)" : ""));
 118 #endif
 119 #ifdef BMP_SUPPORTED
 120   fprintf(stderr, "  -os2           Select BMP output format (OS/2 style)%s\n",
 121           (DEFAULT_FMT == FMT_OS2 ? " (default)" : ""));
 122 #endif
 123 #ifdef PPM_SUPPORTED
 124   fprintf(stderr, "  -pnm           Select PBMPLUS (PPM/PGM) output format%s\n",
 125           (DEFAULT_FMT == FMT_PPM ? " (default)" : ""));
 126 #endif
 127 #ifdef RLE_SUPPORTED
 128   fprintf(stderr, "  -rle           Select Utah RLE output format%s\n",
 129           (DEFAULT_FMT == FMT_RLE ? " (default)" : ""));
 130 #endif
 131 #ifdef TARGA_SUPPORTED
 132   fprintf(stderr, "  -targa         Select Targa output format%s\n",
 133           (DEFAULT_FMT == FMT_TARGA ? " (default)" : ""));
 134 #endif
 135   fprintf(stderr, "Switches for advanced users:\n");
 136 #ifdef DCT_ISLOW_SUPPORTED
 137   fprintf(stderr, "  -dct int       Use integer DCT method%s\n",
 138           (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
 139 #endif
 140 #ifdef DCT_IFAST_SUPPORTED
 141   fprintf(stderr, "  -dct fast      Use fast integer DCT (less accurate)%s\n",
 142           (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
 143 #endif
 144 #ifdef DCT_FLOAT_SUPPORTED
 145   fprintf(stderr, "  -dct float     Use floating-point DCT method%s\n",
 146           (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
 147 #endif
 148   fprintf(stderr, "  -dither fs     Use F-S dithering (default)\n");
 149   fprintf(stderr, "  -dither none   Don't use dithering in quantization\n");
 150   fprintf(stderr, "  -dither ordered  Use ordered dither (medium speed, quality)\n");
 151 #ifdef QUANT_2PASS_SUPPORTED
 152   fprintf(stderr, "  -map FILE      Map to colors used in named image file\n");
 153 #endif
 154   fprintf(stderr, "  -nosmooth      Don't use high-quality upsampling\n");
 155 #ifdef QUANT_1PASS_SUPPORTED
 156   fprintf(stderr, "  -onepass       Use 1-pass quantization (fast, low quality)\n");
 157 #endif
 158   fprintf(stderr, "  -maxmemory N   Maximum memory to use (in kbytes)\n");
 159   fprintf(stderr, "  -outfile name  Specify name for output file\n");
 160   fprintf(stderr, "  -verbose  or  -debug   Emit debug output\n");
 161   exit(EXIT_FAILURE);
 162 }
 163
 164
 165 LOCAL(int)
 166 parse_switches (j_decompress_ptr cinfo, int argc, char **argv,
 167                 int last_file_arg_seen, boolean for_real)
 168 /* Parse optional switches.
 169  * Returns argv[] index of first file-name argument (== argc if none).
 170  * Any file names with indexes <= last_file_arg_seen are ignored;
 171  * they have presumably been processed in a previous iteration.
 172  * (Pass 0 for last_file_arg_seen on the first or only iteration.)
 173  * for_real is FALSE on the first (dummy) pass; we may skip any expensive
 174  * processing.
 175  */
 176 {
 177   int argn;
 178   char * arg;
 179
 180   /* Set up default JPEG parameters. */
 181   requested_fmt = DEFAULT_FMT;  /* set default output file format */
 182   outfilename = NULL;
 183   cinfo->err->trace_level = 0;
 184
 185   /* Scan command line options, adjust parameters */
 186
 187   for (argn = 1; argn < argc; argn++) {
 188     arg = argv[argn];
 189     if (*arg != '-') {
 190       /* Not a switch, must be a file name argument */
 191       if (argn <= last_file_arg_seen) {
 192         outfilename = NULL;     /* -outfile applies to just one input file */
 193         continue;               /* ignore this name if previously processed */
 194       }
 195       break;                    /* else done parsing switches */
 196     }
 197     arg++;                      /* advance past switch marker character */
 198
 199     if (keymatch(arg, "bmp", 1)) {
 200       /* BMP output format. */
 201       requested_fmt = FMT_BMP;
 202
 203     } else if (keymatch(arg, "colors", 1) || keymatch(arg, "colours", 1) ||
 204                keymatch(arg, "quantize", 1) || keymatch(arg, "quantise", 1)) {
 205       /* Do color quantization. */
 206       int val;
 207
 208       if (++argn >= argc)       /* advance to next argument */
 209         usage();
 210       if (sscanf(argv[argn], "%d", &val) != 1)
 211         usage();
 212       cinfo->desired_number_of_colors = val;
 213       cinfo->quantize_colors = TRUE;
 214
 215     } else if (keymatch(arg, "dct", 2)) {
 216       /* Select IDCT algorithm. */
 217       if (++argn >= argc)       /* advance to next argument */
 218         usage();
 219       if (keymatch(argv[argn], "int", 1)) {
 220         cinfo->dct_method = JDCT_ISLOW;
 221       } else if (keymatch(argv[argn], "fast", 2)) {
 222         cinfo->dct_method = JDCT_IFAST;
 223       } else if (keymatch(argv[argn], "float", 2)) {
 224         cinfo->dct_method = JDCT_FLOAT;
 225       } else
 226         usage();
 227
 228     } else if (keymatch(arg, "dither", 2)) {
 229       /* Select dithering algorithm. */
 230       if (++argn >= argc)       /* advance to next argument */
 231         usage();
 232       if (keymatch(argv[argn], "fs", 2)) {
 233         cinfo->dither_mode = JDITHER_FS;
 234       } else if (keymatch(argv[argn], "none", 2)) {
 235         cinfo->dither_mode = JDITHER_NONE;
 236       } else if (keymatch(argv[argn], "ordered", 2)) {
 237         cinfo->dither_mode = JDITHER_ORDERED;
 238       } else
 239         usage();
 240
 241     } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
 242       /* Enable debug printouts. */
 243       /* On first -d, print version identification */
 244       static boolean printed_version = FALSE;
 245
 246       if (! printed_version) {
 247         fprintf(stderr, "Independent JPEG Group's DJPEG, version %s\n%s\n",
 248                 JVERSION, JCOPYRIGHT);
 249         printed_version = TRUE;
 250       }
 251       cinfo->err->trace_level++;
 252
 253     } else if (keymatch(arg, "fast", 1)) {
 254       /* Select recommended processing options for quick-and-dirty output. */
 255       cinfo->two_pass_quantize = FALSE;
 256       cinfo->dither_mode = JDITHER_ORDERED;
 257       if (! cinfo->quantize_colors) /* don't override an earlier -colors */
 258         cinfo->desired_number_of_colors = 216;
 259       cinfo->dct_method = JDCT_FASTEST;
 260       cinfo->do_fancy_upsampling = FALSE;
 261
 262     } else if (keymatch(arg, "gif", 1)) {
 263       /* GIF output format. */
 264       requested_fmt = FMT_GIF;
 265
 266     } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
 267       /* Force monochrome output. */
 268       cinfo->out_color_space = JCS_GRAYSCALE;
 269
 270     } else if (keymatch(arg, "map", 3)) {
 271       /* Quantize to a color map taken from an input file. */
 272       if (++argn >= argc)       /* advance to next argument */
 273         usage();
 274       if (for_real) {           /* too expensive to do twice! */
 275 #ifdef QUANT_2PASS_SUPPORTED    /* otherwise can't quantize to supplied map */
 276         FILE * mapfile;
 277
 278         if ((mapfile = fopen(argv[argn], READ_BINARY)) == NULL) {
 279           fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]);
 280           exit(EXIT_FAILURE);
 281         }
 282         read_color_map(cinfo, mapfile);
 283         fclose(mapfile);
 284         cinfo->quantize_colors = TRUE;
 285 #else
 286         ERREXIT(cinfo, JERR_NOT_COMPILED);
 287 #endif
 288       }
 289
 290     } else if (keymatch(arg, "maxmemory", 3)) {
 291       /* Maximum memory in Kb (or Mb with 'm'). */
 292       long lval;
 293       char ch = 'x';
 294
 295       if (++argn >= argc)       /* advance to next argument */
 296         usage();
 297       if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
 298         usage();
 299       if (ch == 'm' || ch == 'M')
 300         lval *= 1000L;
 301       cinfo->mem->max_memory_to_use = lval * 1000L;
 302
 303     } else if (keymatch(arg, "nosmooth", 3)) {
 304       /* Suppress fancy upsampling */
 305       cinfo->do_fancy_upsampling = FALSE;
 306
 307     } else if (keymatch(arg, "onepass", 3)) {
 308       /* Use fast one-pass quantization. */
 309       cinfo->two_pass_quantize = FALSE;
 310
 311     } else if (keymatch(arg, "os2", 3)) {
 312       /* BMP output format (OS/2 flavor). */
 313       requested_fmt = FMT_OS2;
 314
 315     } else if (keymatch(arg, "outfile", 4)) {
 316       /* Set output file name. */
 317       if (++argn >= argc)       /* advance to next argument */
 318         usage();
 319       outfilename = argv[argn]; /* save it away for later use */
 320
 321     } else if (keymatch(arg, "pnm", 1) || keymatch(arg, "ppm", 1)) {
 322       /* PPM/PGM output format. */
 323       requested_fmt = FMT_PPM;
 324
 325     } else if (keymatch(arg, "rle", 1)) {
 326       /* RLE output format. */
 327       requested_fmt = FMT_RLE;
 328
 329     } else if (keymatch(arg, "scale", 1)) {
 330       /* Scale the output image by a fraction M/N. */
 331       if (++argn >= argc)       /* advance to next argument */
 332         usage();
 333       if (sscanf(argv[argn], "%d/%d",
 334                  &cinfo->scale_num, &cinfo->scale_denom) != 2)
 335         usage();
 336
 337     } else if (keymatch(arg, "targa", 1)) {
 338       /* Targa output format. */
 339       requested_fmt = FMT_TARGA;
 340
 341     } else {
 342       usage();                  /* bogus switch */
 343     }
 344   }
 345
 346   return argn;                  /* return index of next arg (file name) */
 347 }
 348
 349
 350 /*
 351  * Marker processor for COM and interesting APPn markers.
 352  * This replaces the library's built-in processor, which just skips the marker.
 353  * We want to print out the marker as text, to the extent possible.
 354  * Note this code relies on a non-suspending data source.
 355  */
 356
 357 LOCAL(unsigned int)
 358 jpeg_getc (j_decompress_ptr cinfo)
 359 /* Read next byte */
 360 {
 361   struct jpeg_source_mgr * datasrc = cinfo->src;
 362
 363   if (datasrc->bytes_in_buffer == 0) {
 364     if (! (*datasrc->fill_input_buffer) (cinfo))
 365       ERREXIT(cinfo, JERR_CANT_SUSPEND);
 366   }
 367   datasrc->bytes_in_buffer--;
 368   return GETJOCTET(*datasrc->next_input_byte++);
 369 }
 370
 371
 372 METHODDEF(boolean)
 373 print_text_marker (j_decompress_ptr cinfo)
 374 {
 375   boolean traceit = (cinfo->err->trace_level >= 1);
 376   INT32 length;
 377   unsigned int ch;
 378   unsigned int lastch = 0;
 379
 380   length = jpeg_getc(cinfo) << 8;
 381   length += jpeg_getc(cinfo);
 382   length -= 2;                  /* discount the length word itself */
 383
 384   if (traceit) {
 385     if (cinfo->unread_marker == JPEG_COM)
 386       fprintf(stderr, "Comment, length %ld:\n", (long) length);
 387     else                        /* assume it is an APPn otherwise */
 388       fprintf(stderr, "APP%d, length %ld:\n",
 389               cinfo->unread_marker - JPEG_APP0, (long) length);
 390   }
 391
 392   while (--length >= 0) {
 393     ch = jpeg_getc(cinfo);
 394     if (traceit) {
 395       /* Emit the character in a readable form.
 396        * Nonprintables are converted to \nnn form,
 397        * while \ is converted to \\.
 398        * Newlines in CR, CR/LF, or LF form will be printed as one newline.
 399        */
 400       if (ch == '\r') {
 401         fprintf(stderr, "\n");
 402       } else if (ch == '\n') {
 403         if (lastch != '\r')
 404           fprintf(stderr, "\n");
 405       } else if (ch == '\\') {
 406         fprintf(stderr, "\\\\");
 407       } else if (isprint(ch)) {
 408         putc(ch, stderr);
 409       } else {
 410         fprintf(stderr, "\\%03o", ch);
 411       }
 412       lastch = ch;
 413     }
 414   }
 415
 416   if (traceit)
 417     fprintf(stderr, "\n");
 418
 419   return TRUE;
 420 }
 421
 422
 423 /*
 424  * The main program.
 425  */
 426
 427 int
 428 main (int argc, char **argv)
 429 {
 430   struct jpeg_decompress_struct cinfo;
 431   struct jpeg_error_mgr jerr;
 432 #ifdef PROGRESS_REPORT
 433   struct cdjpeg_progress_mgr progress;
 434 #endif
 435   int file_index;
 436   djpeg_dest_ptr dest_mgr = NULL;
 437   FILE * input_file;
 438   FILE * output_file;
 439   JDIMENSION num_scanlines;
 440
 441   /* On Mac, fetch a command line. */
 442 #ifdef USE_CCOMMAND
 443   argc = ccommand(&argv);
 444 #endif
 445
 446   progname = argv[0];
 447   if (progname == NULL || progname[0] == 0)
 448     progname = "djpeg";         /* in case C library doesn't provide it */
 449
 450   /* Initialize the JPEG decompression object with default error handling. */
 451   cinfo.err = jpeg_std_error(&jerr);
 452   jpeg_create_decompress(&cinfo);
 453   /* Add some application-specific error messages (from cderror.h) */
 454   jerr.addon_message_table = cdjpeg_message_table;
 455   jerr.first_addon_message = JMSG_FIRSTADDONCODE;
 456   jerr.last_addon_message = JMSG_LASTADDONCODE;
 457
 458   /* Insert custom marker processor for COM and APP12.
 459    * APP12 is used by some digital camera makers for textual info,
 460    * so we provide the ability to display it as text.
 461    * If you like, additional APPn marker types can be selected for display,
 462    * but don't try to override APP0 or APP14 this way (see libjpeg.doc).
 463    */
 464   jpeg_set_marker_processor(&cinfo, JPEG_COM, print_text_marker);
 465   jpeg_set_marker_processor(&cinfo, JPEG_APP0+12, print_text_marker);
 466
 467   /* Now safe to enable signal catcher. */
 468 #ifdef NEED_SIGNAL_CATCHER
 469   enable_signal_catcher((j_common_ptr) &cinfo);
 470 #endif
 471
 472   /* Scan command line to find file names. */
 473   /* It is convenient to use just one switch-parsing routine, but the switch
 474    * values read here are ignored; we will rescan the switches after opening
 475    * the input file.
 476    * (Exception: tracing level set here controls verbosity for COM markers
 477    * found during jpeg_read_header...)
 478    */
 479
 480   file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
 481
 482 #ifdef TWO_FILE_COMMANDLINE
 483   /* Must have either -outfile switch or explicit output file name */
 484   if (outfilename == NULL) {
 485     if (file_index != argc-2) {
 486       fprintf(stderr, "%s: must name one input and one output file\n",
 487               progname);
 488       usage();
 489     }
 490     outfilename = argv[file_index+1];
 491   } else {
 492     if (file_index != argc-1) {
 493       fprintf(stderr, "%s: must name one input and one output file\n",
 494               progname);
 495       usage();
 496     }
 497   }
 498 #else
 499   /* Unix style: expect zero or one file name */
 500   if (file_index < argc-1) {
 501     fprintf(stderr, "%s: only one input file\n", progname);
 502     usage();
 503   }
 504 #endif /* TWO_FILE_COMMANDLINE */
 505
 506   /* Open the input file. */
 507   if (file_index < argc) {
 508     if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
 509       fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
 510       exit(EXIT_FAILURE);
 511     }
 512   } else {
 513     /* default input file is stdin */
 514     input_file = read_stdin();
 515   }
 516
 517   /* Open the output file. */
 518   if (outfilename != NULL) {
 519     if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
 520       fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
 521       exit(EXIT_FAILURE);
 522     }
 523   } else {
 524     /* default output file is stdout */
 525     output_file = write_stdout();
 526   }
 527
 528 #ifdef PROGRESS_REPORT
 529   start_progress_monitor((j_common_ptr) &cinfo, &progress);
 530 #endif
 531
 532   /* Specify data source for decompression */
 533   jpeg_stdio_src(&cinfo, input_file);
 534
 535   /* Read file header, set default decompression parameters */
 536   (void) jpeg_read_header(&cinfo, TRUE);
 537
 538   /* Adjust default decompression parameters by re-parsing the options */
 539   file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
 540
 541   /* Initialize the output module now to let it override any crucial
 542    * option settings (for instance, GIF wants to force color quantization).
 543    */
 544   switch (requested_fmt) {
 545 #ifdef BMP_SUPPORTED
 546   case FMT_BMP:
 547     dest_mgr = jinit_write_bmp(&cinfo, FALSE);
 548     break;
 549   case FMT_OS2:
 550     dest_mgr = jinit_write_bmp(&cinfo, TRUE);
 551     break;
 552 #endif
 553 #ifdef GIF_SUPPORTED
 554   case FMT_GIF:
 555     dest_mgr = jinit_write_gif(&cinfo);
 556     break;
 557 #endif
 558 #ifdef PPM_SUPPORTED
 559   case FMT_PPM:
 560     dest_mgr = jinit_write_ppm(&cinfo);
 561     break;
 562 #endif
 563 #ifdef RLE_SUPPORTED
 564   case FMT_RLE:
 565     dest_mgr = jinit_write_rle(&cinfo);
 566     break;
 567 #endif
 568 #ifdef TARGA_SUPPORTED
 569   case FMT_TARGA:
 570     dest_mgr = jinit_write_targa(&cinfo);
 571     break;
 572 #endif
 573   default:
 574     ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT);
 575     break;
 576   }
 577   dest_mgr->output_file = output_file;
 578
 579   /* Start decompressor */
 580   (void) jpeg_start_decompress(&cinfo);
 581
 582   /* Write output file header */
 583   (*dest_mgr->start_output) (&cinfo, dest_mgr);
 584
 585   /* Process data */
 586   while (cinfo.output_scanline < cinfo.output_height) {
 587     num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
 588                                         dest_mgr->buffer_height);
 589     (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
 590   }
 591
 592 #ifdef PROGRESS_REPORT
 593   /* Hack: count final pass as done in case finish_output does an extra pass.
 594    * The library won't have updated completed_passes.
 595    */
 596   progress.pub.completed_passes = progress.pub.total_passes;
 597 #endif
 598
 599   /* Finish decompression and release memory.
 600    * I must do it in this order because output module has allocated memory
 601    * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory.
 602    */
 603   (*dest_mgr->finish_output) (&cinfo, dest_mgr);
 604   (void) jpeg_finish_decompress(&cinfo);
 605   jpeg_destroy_decompress(&cinfo);
 606
 607   /* Close files, if we opened them */
 608   if (input_file != stdin)
 609     fclose(input_file);
 610   if (output_file != stdout)
 611     fclose(output_file);
 612
 613 #ifdef PROGRESS_REPORT
 614   end_progress_monitor((j_common_ptr) &cinfo);
 615 #endif
 616
 617   /* All done. */
 618   exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
 619   return 0;                     /* suppress no-return-value warnings */
 620 }