dll/3rdparty/libjpeg/jpegtran.c

   1 /*
   2  * jpegtran.c
   3  *
   4  * Copyright (C) 1995-2001, Thomas G. Lane.
   5  * This file is part of the Independent JPEG Group's software.
   6  * For conditions of distribution and use, see the accompanying README file.
   7  *
   8  * This file contains a command-line user interface for JPEG transcoding.
   9  * It is very similar to cjpeg.c, but provides lossless transcoding between
  10  * different JPEG file formats.  It also provides some lossless and sort-of-
  11  * lossless transformations of JPEG data.
  12  */
  13
  14 #include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */
  15 #include "transupp.h"           /* Support routines for jpegtran */
  16 #include "jversion.h"           /* for version message */
  17
  18 #ifdef USE_CCOMMAND             /* command-line reader for Macintosh */
  19 #ifdef __MWERKS__
  20 #include <SIOUX.h>              /* Metrowerks needs this */
  21 #include <console.h>            /* ... and this */
  22 #endif
  23 #ifdef THINK_C
  24 #include <console.h>            /* Think declares it here */
  25 #endif
  26 #endif
  27
  28
  29 /*
  30  * Argument-parsing code.
  31  * The switch parser is designed to be useful with DOS-style command line
  32  * syntax, ie, intermixed switches and file names, where only the switches
  33  * to the left of a given file name affect processing of that file.
  34  * The main program in this file doesn't actually use this capability...
  35  */
  36
  37
  38 static const char * progname;   /* program name for error messages */
  39 static char * outfilename;      /* for -outfile switch */
  40 static char * dropfilename;    /* for -drop switch */
  41 static JCOPY_OPTION copyoption; /* -copy switch */
  42 static jpeg_transform_info transformoption; /* image transformation options */
  43
  44
  45 LOCAL(void)
  46 usage (void)
  47 /* complain about bad command line */
  48 {
  49   fprintf(stderr, "usage: %s [switches] ", progname);
  50 #ifdef TWO_FILE_COMMANDLINE
  51   fprintf(stderr, "inputfile outputfile\n");
  52 #else
  53   fprintf(stderr, "[inputfile]\n");
  54 #endif
  55
  56   fprintf(stderr, "Switches (names may be abbreviated):\n");
  57   fprintf(stderr, "  -copy none     Copy no extra markers from source file\n");
  58   fprintf(stderr, "  -copy comments Copy only comment markers (default)\n");
  59   fprintf(stderr, "  -copy all      Copy all extra markers\n");
  60   fprintf(stderr, "  -copy exif     Copy EXIF marker and omit JFIF if EXIF\n");
  61 #ifdef ENTROPY_OPT_SUPPORTED
  62   fprintf(stderr, "  -optimize      Optimize Huffman table (smaller file, but slow compression)\n");
  63 #endif
  64 #ifdef C_PROGRESSIVE_SUPPORTED
  65   fprintf(stderr, "  -progressive   Create progressive JPEG file\n");
  66 #endif
  67 #if TRANSFORMS_SUPPORTED
  68   fprintf(stderr, "Switches for modifying the image:\n");
  69   fprintf(stderr, "  -crop WxH+X+Y  Crop to a rectangular subarea\n");
  70   fprintf(stderr, "  -drop +X+Y filename          Drop another image\n");
  71   fprintf(stderr, "  -grayscale     Reduce to grayscale (omit color data)\n");
  72   fprintf(stderr, "  -flip [horizontal|vertical]  Mirror image (left-right or top-bottom)\n");
  73   fprintf(stderr, "  -perfect       Fail if there is non-transformable edge blocks\n");
  74   fprintf(stderr, "  -rotate [90|180|270]         Rotate image (degrees clockwise)\n");
  75   fprintf(stderr, "  -transpose     Transpose image\n");
  76   fprintf(stderr, "  -transverse    Transverse transpose image\n");
  77   fprintf(stderr, "  -trim          Drop non-transformable edge blocks or\n");
  78   fprintf(stderr, "                 with -drop: Requantize drop file to source file\n");
  79 #endif /* TRANSFORMS_SUPPORTED */
  80   fprintf(stderr, "Switches for advanced users:\n");
  81   fprintf(stderr, "  -restart N     Set restart interval in rows, or in blocks with B\n");
  82   fprintf(stderr, "  -maxmemory N   Maximum memory to use (in kbytes)\n");
  83   fprintf(stderr, "  -outfile name  Specify name for output file\n");
  84   fprintf(stderr, "  -verbose  or  -debug   Emit debug output\n");
  85   fprintf(stderr, "Switches for wizards:\n");
  86 #ifdef C_ARITH_CODING_SUPPORTED
  87   fprintf(stderr, "  -arithmetic    Use arithmetic coding\n");
  88 #endif
  89 #ifdef C_MULTISCAN_FILES_SUPPORTED
  90   fprintf(stderr, "  -scans file    Create multi-scan JPEG per script file\n");
  91 #endif
  92   exit(EXIT_FAILURE);
  93 }
  94
  95
  96 LOCAL(void)
  97 select_transform (JXFORM_CODE transform)
  98 /* Silly little routine to detect multiple transform options,
  99  * which we can't handle.
 100  */
 101 {
 102 #if TRANSFORMS_SUPPORTED
 103   if (transformoption.transform == JXFORM_NONE ||
 104       transformoption.transform == transform) {
 105     transformoption.transform = transform;
 106   } else {
 107     fprintf(stderr, "%s: can only do one image transformation at a time\n",
 108             progname);
 109     usage();
 110   }
 111 #else
 112   fprintf(stderr, "%s: sorry, image transformation was not compiled\n",
 113           progname);
 114   exit(EXIT_FAILURE);
 115 #endif
 116 }
 117
 118 LOCAL(void)
 119 handle_exif (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
 120              JCOPY_OPTION *copyoption)
 121 /* Adjust the marker writing options to create an EXIF file, instead of JFIF,
 122  * if so requested or an EXIF file is detected as input. Must be called after
 123  * jpeg_copy_critical_parameters() as that sets the defaults. */
 124 {
 125   jpeg_saved_marker_ptr cur_marker, prev_marker;
 126
 127   /* Look for an exif marker */
 128   prev_marker = NULL;
 129   cur_marker = srcinfo->marker_list;
 130   while (cur_marker != NULL) {
 131     if (cur_marker->marker == JPEG_APP0+1 &&
 132         cur_marker->data_length >= 6 &&
 133         GETJOCTET(cur_marker->data[0]) == 0x45 &&
 134         GETJOCTET(cur_marker->data[1]) == 0x78 &&
 135         GETJOCTET(cur_marker->data[2]) == 0x69 &&
 136         GETJOCTET(cur_marker->data[3]) == 0x66 &&
 137         GETJOCTET(cur_marker->data[4]) == 0 &&
 138         GETJOCTET(cur_marker->data[5]) == 0)
 139       break; /* found an EXIF marker */
 140     prev_marker = cur_marker;
 141     cur_marker = cur_marker->next;
 142   }
 143   /* If we've found an EXIF marker but not JFIF this is an EXIF file. Unless
 144    * explicitely requested, make sure we keep the EXIF marker and do not
 145    * emit a JFIF marker (which would come before). EXIF requires that the
 146    * first marker be EXIF. */
 147   if (cur_marker != NULL &&
 148       ((*copyoption != JCOPYOPT_NONE && !srcinfo->saw_JFIF_marker) ||
 149        (*copyoption == JCOPYOPT_EXIF))) {
 150     dstinfo->write_JFIF_header = FALSE;
 151     if (*copyoption == JCOPYOPT_COMMENTS)
 152       *copyoption = JCOPYOPT_EXIF;
 153   }
 154   /* If making an EXIF file, make sure that EXIF is first marker */
 155   if (cur_marker != NULL && prev_marker != NULL &&
 156       *copyoption == JCOPYOPT_EXIF) {
 157     prev_marker->next = cur_marker->next;
 158     cur_marker->next = srcinfo->marker_list;
 159     srcinfo->marker_list = cur_marker;
 160   }
 161 }
 162
 163 LOCAL(int)
 164 parse_switches (j_compress_ptr cinfo, int argc, char **argv,
 165                 int last_file_arg_seen, boolean for_real)
 166 /* Parse optional switches.
 167  * Returns argv[] index of first file-name argument (== argc if none).
 168  * Any file names with indexes <= last_file_arg_seen are ignored;
 169  * they have presumably been processed in a previous iteration.
 170  * (Pass 0 for last_file_arg_seen on the first or only iteration.)
 171  * for_real is FALSE on the first (dummy) pass; we may skip any expensive
 172  * processing.
 173  */
 174 {
 175   int argn;
 176   char * arg;
 177   boolean simple_progressive;
 178   char * scansarg = NULL;       /* saves -scans parm if any */
 179
 180   /* Set up default JPEG parameters. */
 181   simple_progressive = FALSE;
 182   outfilename = NULL;
 183   dropfilename = NULL;
 184   copyoption = JCOPYOPT_DEFAULT;
 185   transformoption.transform = JXFORM_NONE;
 186   transformoption.trim = FALSE;
 187   transformoption.perfect = FALSE;
 188   transformoption.force_grayscale = FALSE;
 189   transformoption.crop = FALSE;
 190   cinfo->err->trace_level = 0;
 191
 192   /* Scan command line options, adjust parameters */
 193
 194   for (argn = 1; argn < argc; argn++) {
 195     arg = argv[argn];
 196     if (*arg != '-') {
 197       /* Not a switch, must be a file name argument */
 198       if (argn <= last_file_arg_seen) {
 199         outfilename = NULL;     /* -outfile applies to just one input file */
 200         continue;               /* ignore this name if previously processed */
 201       }
 202       break;                    /* else done parsing switches */
 203     }
 204     arg++;                      /* advance past switch marker character */
 205
 206     if (keymatch(arg, "arithmetic", 1)) {
 207       /* Use arithmetic coding. */
 208 #ifdef C_ARITH_CODING_SUPPORTED
 209       cinfo->arith_code = TRUE;
 210 #else
 211       fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",
 212               progname);
 213       exit(EXIT_FAILURE);
 214 #endif
 215
 216     } else if (keymatch(arg, "copy", 2)) {
 217       /* Select which extra markers to copy. */
 218       if (++argn >= argc)       /* advance to next argument */
 219         usage();
 220       if (keymatch(argv[argn], "none", 1)) {
 221         copyoption = JCOPYOPT_NONE;
 222       } else if (keymatch(argv[argn], "comments", 1)) {
 223         copyoption = JCOPYOPT_COMMENTS;
 224       } else if (keymatch(argv[argn], "all", 1)) {
 225         copyoption = JCOPYOPT_ALL;
 226       } else if (keymatch(argv[argn], "exif", 1)) {
 227         copyoption = JCOPYOPT_EXIF;
 228       } else
 229         usage();
 230
 231     } else if (keymatch(arg, "crop", 2)) {
 232       /* Perform lossless cropping. */
 233 #if TRANSFORMS_SUPPORTED
 234       if (++argn >= argc)       /* advance to next argument */
 235         usage();
 236       if (transformoption.crop /* reject multiple crop/drop requests */ ||
 237          ! jtransform_parse_crop_spec(&transformoption, argv[argn])) {
 238         fprintf(stderr, "%s: bogus -crop argument '%s'\n",
 239                 progname, argv[argn]);
 240         exit(EXIT_FAILURE);
 241       }
 242 #else
 243       select_transform(JXFORM_NONE);    /* force an error */
 244 #endif
 245
 246     } else if (keymatch(arg, "drop", 2)) {
 247 #if TRANSFORMS_SUPPORTED
 248       if (++argn >= argc)      /* advance to next argument */
 249        usage();
 250       if (transformoption.crop /* reject multiple crop/drop requests */ ||
 251          ! jtransform_parse_crop_spec(&transformoption, argv[argn]) ||
 252          transformoption.crop_width_set != JCROP_UNSET ||
 253          transformoption.crop_height_set != JCROP_UNSET) {
 254        fprintf(stderr, "%s: bogus -drop argument '%s'\n",
 255                progname, argv[argn]);
 256        exit(EXIT_FAILURE);
 257       }
 258       if (++argn >= argc)      /* advance to next argument */
 259        usage();
 260       dropfilename = argv[argn];
 261       select_transform(JXFORM_DROP);
 262 #else
 263       select_transform(JXFORM_NONE);   /* force an error */
 264 #endif
 265
 266
 267     } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
 268       /* Enable debug printouts. */
 269       /* On first -d, print version identification */
 270       static boolean printed_version = FALSE;
 271
 272       if (! printed_version) {
 273         fprintf(stderr, "Independent JPEG Group's JPEGTRAN, version %s\n%s\n",
 274                 JVERSION, JCOPYRIGHT);
 275         fprintf(stderr, "EXIF support v 0.1 added 29-Sep-2003\n");
 276         printed_version = TRUE;
 277       }
 278       cinfo->err->trace_level++;
 279
 280     } else if (keymatch(arg, "flip", 1)) {
 281       /* Mirror left-right or top-bottom. */
 282       if (++argn >= argc)       /* advance to next argument */
 283         usage();
 284       if (keymatch(argv[argn], "horizontal", 1))
 285         select_transform(JXFORM_FLIP_H);
 286       else if (keymatch(argv[argn], "vertical", 1))
 287         select_transform(JXFORM_FLIP_V);
 288       else
 289         usage();
 290
 291     } else if (keymatch(arg, "grayscale", 1) || keymatch(arg, "greyscale",1)) {
 292       /* Force to grayscale. */
 293 #if TRANSFORMS_SUPPORTED
 294       transformoption.force_grayscale = TRUE;
 295 #else
 296       select_transform(JXFORM_NONE);    /* force an error */
 297 #endif
 298
 299     } else if (keymatch(arg, "maxmemory", 3)) {
 300       /* Maximum memory in Kb (or Mb with 'm'). */
 301       long lval;
 302       char ch = 'x';
 303
 304       if (++argn >= argc)       /* advance to next argument */
 305         usage();
 306       if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
 307         usage();
 308       if (ch == 'm' || ch == 'M')
 309         lval *= 1000L;
 310       cinfo->mem->max_memory_to_use = lval * 1000L;
 311
 312     } else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) {
 313       /* Enable entropy parm optimization. */
 314 #ifdef ENTROPY_OPT_SUPPORTED
 315       cinfo->optimize_coding = TRUE;
 316 #else
 317       fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n",
 318               progname);
 319       exit(EXIT_FAILURE);
 320 #endif
 321
 322     } else if (keymatch(arg, "outfile", 4)) {
 323       /* Set output file name. */
 324       if (++argn >= argc)       /* advance to next argument */
 325         usage();
 326       outfilename = argv[argn]; /* save it away for later use */
 327
 328     } else if (keymatch(arg, "perfect", 2)) {
 329       /* Fail if there is any partial edge MCUs that the transform can't
 330        * handle. */
 331       transformoption.perfect = TRUE;
 332
 333     } else if (keymatch(arg, "progressive", 2)) {
 334       /* Select simple progressive mode. */
 335 #ifdef C_PROGRESSIVE_SUPPORTED
 336       simple_progressive = TRUE;
 337       /* We must postpone execution until num_components is known. */
 338 #else
 339       fprintf(stderr, "%s: sorry, progressive output was not compiled\n",
 340               progname);
 341       exit(EXIT_FAILURE);
 342 #endif
 343
 344     } else if (keymatch(arg, "restart", 1)) {
 345       /* Restart interval in MCU rows (or in MCUs with 'b'). */
 346       long lval;
 347       char ch = 'x';
 348
 349       if (++argn >= argc)       /* advance to next argument */
 350         usage();
 351       if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
 352         usage();
 353       if (lval < 0 || lval > 65535L)
 354         usage();
 355       if (ch == 'b' || ch == 'B') {
 356         cinfo->restart_interval = (unsigned int) lval;
 357         cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */
 358       } else {
 359         cinfo->restart_in_rows = (int) lval;
 360         /* restart_interval will be computed during startup */
 361       }
 362
 363     } else if (keymatch(arg, "rotate", 2)) {
 364       /* Rotate 90, 180, or 270 degrees (measured clockwise). */
 365       if (++argn >= argc)       /* advance to next argument */
 366         usage();
 367       if (keymatch(argv[argn], "90", 2))
 368         select_transform(JXFORM_ROT_90);
 369       else if (keymatch(argv[argn], "180", 3))
 370         select_transform(JXFORM_ROT_180);
 371       else if (keymatch(argv[argn], "270", 3))
 372         select_transform(JXFORM_ROT_270);
 373       else
 374         usage();
 375
 376     } else if (keymatch(arg, "scans", 1)) {
 377       /* Set scan script. */
 378 #ifdef C_MULTISCAN_FILES_SUPPORTED
 379       if (++argn >= argc)       /* advance to next argument */
 380         usage();
 381       scansarg = argv[argn];
 382       /* We must postpone reading the file in case -progressive appears. */
 383 #else
 384       fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n",
 385               progname);
 386       exit(EXIT_FAILURE);
 387 #endif
 388
 389     } else if (keymatch(arg, "transpose", 1)) {
 390       /* Transpose (across UL-to-LR axis). */
 391       select_transform(JXFORM_TRANSPOSE);
 392
 393     } else if (keymatch(arg, "transverse", 6)) {
 394       /* Transverse transpose (across UR-to-LL axis). */
 395       select_transform(JXFORM_TRANSVERSE);
 396
 397     } else if (keymatch(arg, "trim", 3)) {
 398       /* Trim off any partial edge MCUs that the transform can't handle. */
 399       transformoption.trim = TRUE;
 400
 401     } else {
 402       usage();                  /* bogus switch */
 403     }
 404   }
 405
 406   /* Post-switch-scanning cleanup */
 407
 408   if (for_real) {
 409
 410 #ifdef C_PROGRESSIVE_SUPPORTED
 411     if (simple_progressive)     /* process -progressive; -scans can override */
 412       jpeg_simple_progression(cinfo);
 413 #endif
 414
 415 #ifdef C_MULTISCAN_FILES_SUPPORTED
 416     if (scansarg != NULL)       /* process -scans if it was present */
 417       if (! read_scan_script(cinfo, scansarg))
 418         usage();
 419 #endif
 420   }
 421
 422   return argn;                  /* return index of next arg (file name) */
 423 }
 424
 425
 426 /*
 427  * The main program.
 428  */
 429
 430 int
 431 main (int argc, char **argv)
 432 {
 433   struct jpeg_decompress_struct srcinfo;
 434   struct jpeg_error_mgr jsrcerr;
 435 #if TRANSFORMS_SUPPORTED
 436   struct jpeg_decompress_struct dropinfo;
 437   struct jpeg_error_mgr jdroperr;
 438   FILE * drop_file;
 439 #endif
 440   struct jpeg_compress_struct dstinfo;
 441   struct jpeg_error_mgr jdsterr;
 442 #ifdef PROGRESS_REPORT
 443   struct cdjpeg_progress_mgr progress;
 444 #endif
 445   jvirt_barray_ptr * src_coef_arrays;
 446   jvirt_barray_ptr * dst_coef_arrays;
 447   int file_index;
 448   /* We assume all-in-memory processing and can therefore use only a
 449    * single file pointer for sequential input and output operation.
 450    */
 451   FILE * fp;
 452
 453   /* On Mac, fetch a command line. */
 454 #ifdef USE_CCOMMAND
 455   argc = ccommand(&argv);
 456 #endif
 457
 458   progname = argv[0];
 459   if (progname == NULL || progname[0] == 0)
 460     progname = "jpegtran";      /* in case C library doesn't provide it */
 461
 462   /* Initialize the JPEG decompression object with default error handling. */
 463   srcinfo.err = jpeg_std_error(&jsrcerr);
 464   jpeg_create_decompress(&srcinfo);
 465   /* Initialize the JPEG compression object with default error handling. */
 466   dstinfo.err = jpeg_std_error(&jdsterr);
 467   jpeg_create_compress(&dstinfo);
 468
 469   /* Now safe to enable signal catcher.
 470    * Note: we assume only the decompression object will have virtual arrays.
 471    */
 472 #ifdef NEED_SIGNAL_CATCHER
 473   enable_signal_catcher((j_common_ptr) &srcinfo);
 474 #endif
 475
 476   /* Scan command line to find file names.
 477    * It is convenient to use just one switch-parsing routine, but the switch
 478    * values read here are mostly ignored; we will rescan the switches after
 479    * opening the input file.  Also note that most of the switches affect the
 480    * destination JPEG object, so we parse into that and then copy over what
 481    * needs to affects the source too.
 482    */
 483
 484   file_index = parse_switches(&dstinfo, argc, argv, 0, FALSE);
 485   jsrcerr.trace_level = jdsterr.trace_level;
 486   srcinfo.mem->max_memory_to_use = dstinfo.mem->max_memory_to_use;
 487
 488 #ifdef TWO_FILE_COMMANDLINE
 489   /* Must have either -outfile switch or explicit output file name */
 490   if (outfilename == NULL) {
 491     if (file_index != argc-2) {
 492       fprintf(stderr, "%s: must name one input and one output file\n",
 493               progname);
 494       usage();
 495     }
 496     outfilename = argv[file_index+1];
 497   } else {
 498     if (file_index != argc-1) {
 499       fprintf(stderr, "%s: must name one input and one output file\n",
 500               progname);
 501       usage();
 502     }
 503   }
 504 #else
 505   /* Unix style: expect zero or one file name */
 506   if (file_index < argc-1) {
 507     fprintf(stderr, "%s: only one input file\n", progname);
 508     usage();
 509   }
 510 #endif /* TWO_FILE_COMMANDLINE */
 511
 512   /* Open the input file. */
 513   if (file_index < argc) {
 514     if ((fp = fopen(argv[file_index], READ_BINARY)) == NULL) {
 515       fprintf(stderr, "%s: can't open %s for reading\n", progname, argv[file_index]);
 516       exit(EXIT_FAILURE);
 517     }
 518   } else {
 519     /* default input file is stdin */
 520     fp = read_stdin();
 521   }
 522 #if TRANSFORMS_SUPPORTED
 523   /* Open the drop file. */
 524   if (dropfilename != NULL) {
 525     if ((drop_file = fopen(dropfilename, READ_BINARY)) == NULL) {
 526       fprintf(stderr, "%s: can't open %s for reading\n", progname, dropfilename);
 527       exit(EXIT_FAILURE);
 528     }
 529     dropinfo.err = jpeg_std_error(&jdroperr);
 530     jpeg_create_decompress(&dropinfo);
 531     jpeg_stdio_src(&dropinfo, drop_file);
 532   } else {
 533     drop_file = NULL;
 534   }
 535 #endif
 536
 537
 538 #ifdef PROGRESS_REPORT
 539   start_progress_monitor((j_common_ptr) &dstinfo, &progress);
 540 #endif
 541
 542   /* Specify data source for decompression */
 543   jpeg_stdio_src(&srcinfo, fp);
 544
 545   /* Enable saving of extra markers that we want to copy */
 546   jcopy_markers_setup(&srcinfo, copyoption);
 547
 548   /* Read file header */
 549   (void) jpeg_read_header(&srcinfo, TRUE);
 550
 551 #if TRANSFORMS_SUPPORTED
 552   if (dropfilename != NULL) {
 553     (void) jpeg_read_header(&dropinfo, TRUE);
 554     transformoption.crop_width = dropinfo.image_width;
 555     transformoption.crop_width_set = JCROP_POS;
 556     transformoption.crop_height = dropinfo.image_height;
 557     transformoption.crop_height_set = JCROP_POS;
 558     transformoption.drop_ptr = &dropinfo;
 559   }
 560 #endif
 561
 562   /* Any space needed by a transform option must be requested before
 563    * jpeg_read_coefficients so that memory allocation will be done right.
 564    */
 565 #if TRANSFORMS_SUPPORTED
 566   /* Fails right away if -perfect is given and transformation is not perfect.
 567    */
 568   if (transformoption.perfect &&
 569       !jtransform_perfect_transform(srcinfo.image_width, srcinfo.image_height,
 570       srcinfo.max_h_samp_factor * DCTSIZE, srcinfo.max_v_samp_factor * DCTSIZE,
 571       transformoption.transform)) {
 572     fprintf(stderr, "%s: transformation is not perfect\n", progname);
 573     exit(EXIT_FAILURE);
 574   }
 575   jtransform_request_workspace(&srcinfo, &transformoption);
 576 #endif
 577
 578   /* Read source file as DCT coefficients */
 579   src_coef_arrays = jpeg_read_coefficients(&srcinfo);
 580
 581 #if TRANSFORMS_SUPPORTED
 582   if (dropfilename != NULL) {
 583     transformoption.drop_coef_arrays = jpeg_read_coefficients(&dropinfo);
 584   }
 585 #endif
 586
 587   /* Initialize destination compression parameters from source values */
 588   jpeg_copy_critical_parameters(&srcinfo, &dstinfo);
 589
 590
 591   /* Adjust destination parameters if required by transform options;
 592    * also find out which set of coefficient arrays will hold the output.
 593    */
 594 #if TRANSFORMS_SUPPORTED
 595   dst_coef_arrays = jtransform_adjust_parameters(&srcinfo, &dstinfo,
 596                                                  src_coef_arrays,
 597                                                  &transformoption);
 598 #else
 599   dst_coef_arrays = src_coef_arrays;
 600 #endif
 601
 602   /* Close input file, if we opened it.
 603    * Note: we assume that jpeg_read_coefficients consumed all input
 604    * until JPEG_REACHED_EOI, and that jpeg_finish_decompress will
 605    * only consume more while (! cinfo->inputctl->eoi_reached).
 606    * We cannot call jpeg_finish_decompress here since we still need the
 607    * virtual arrays allocated from the source object for processing.
 608    */
 609   if (fp != stdin)
 610     fclose(fp);
 611
 612   /* Open the output file. */
 613   if (outfilename != NULL) {
 614     if ((fp = fopen(outfilename, WRITE_BINARY)) == NULL) {
 615       fprintf(stderr, "%s: can't open %s for writing\n", progname, outfilename);
 616       exit(EXIT_FAILURE);
 617     }
 618   } else {
 619     /* default output file is stdout */
 620     fp = write_stdout();
 621   }
 622
 623   /* Adjust default compression parameters by re-parsing the options */
 624   /* Save value of copyoption */
 625   file_index = parse_switches(&dstinfo, argc, argv, 0, TRUE);
 626
 627   /* If we want EXIF, make sure we do not write incompatible markers */
 628   handle_exif(&srcinfo,&dstinfo,&copyoption);
 629
 630   /* Specify data destination for compression */
 631   jpeg_stdio_dest(&dstinfo, fp);
 632
 633   /* Start compressor (note no image data is actually written here) */
 634   jpeg_write_coefficients(&dstinfo, dst_coef_arrays);
 635
 636   /* Copy to the output file any extra markers that we want to preserve */
 637   jcopy_markers_execute(&srcinfo, &dstinfo, copyoption);
 638
 639   /* Execute image transformation, if any */
 640 #if TRANSFORMS_SUPPORTED
 641   jtransform_execute_transform(&srcinfo, &dstinfo,
 642                               src_coef_arrays,
 643                               &transformoption);
 644 #endif
 645
 646   /* Finish compression and release memory */
 647   jpeg_finish_compress(&dstinfo);
 648   jpeg_destroy_compress(&dstinfo);
 649 #if TRANSFORMS_SUPPORTED
 650   if (dropfilename != NULL) {
 651     (void) jpeg_finish_decompress(&dropinfo);
 652     jpeg_destroy_decompress(&dropinfo);
 653   }
 654 #endif
 655   (void) jpeg_finish_decompress(&srcinfo);
 656   jpeg_destroy_decompress(&srcinfo);
 657
 658   /* Close output file, if we opened it */
 659   if (fp != stdout)
 660     fclose(fp);
 661 #if TRANSFORMS_SUPPORTED
 662   if (drop_file != NULL)
 663     fclose(drop_file);
 664 #endif
 665
 666 #ifdef PROGRESS_REPORT
 667   end_progress_monitor((j_common_ptr) &dstinfo);
 668 #endif
 669
 670   /* All done. */
 671 #if TRANSFORMS_SUPPORTED
 672   if (dropfilename != NULL)
 673     exit(jsrcerr.num_warnings + jdroperr.num_warnings + jdsterr.num_warnings ?
 674         EXIT_WARNING : EXIT_SUCCESS);
 675 #endif
 676   exit(jsrcerr.num_warnings + jdsterr.num_warnings ?EXIT_WARNING:EXIT_SUCCESS);
 677   return 0;                     /* suppress no-return-value warnings */
 678 }