release/src/router/jpeg/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 JCOPY_OPTION copyoption; /* -copy switch */
  41 static jpeg_transform_info transformoption; /* image transformation options */
  42
  43
  44 LOCAL(void)
  45 usage (void)
  46 /* complain about bad command line */
  47 {
  48   fprintf(stderr, "usage: %s [switches] ", progname);
  49 #ifdef TWO_FILE_COMMANDLINE
  50   fprintf(stderr, "inputfile outputfile\n");
  51 #else
  52   fprintf(stderr, "[inputfile]\n");
  53 #endif
  54
  55   fprintf(stderr, "Switches (names may be abbreviated):\n");
  56   fprintf(stderr, "  -copy none     Copy no extra markers from source file\n");
  57   fprintf(stderr, "  -copy comments Copy only comment markers (default)\n");
  58   fprintf(stderr, "  -copy all      Copy all extra markers\n");
  59 #ifdef ENTROPY_OPT_SUPPORTED
  60   fprintf(stderr, "  -optimize      Optimize Huffman table (smaller file, but slow compression)\n");
  61 #endif
  62 #ifdef C_PROGRESSIVE_SUPPORTED
  63   fprintf(stderr, "  -progressive   Create progressive JPEG file\n");
  64 #endif
  65 #if TRANSFORMS_SUPPORTED
  66   fprintf(stderr, "Switches for modifying the image:\n");
  67   fprintf(stderr, "  -crop WxH+X+Y  Crop to a rectangular subarea\n");
  68   fprintf(stderr, "  -grayscale     Reduce to grayscale (omit color data)\n");
  69   fprintf(stderr, "  -flip [horizontal|vertical]  Mirror image (left-right or top-bottom)\n");
  70   fprintf(stderr, "  -perfect       Fail if there is non-transformable edge blocks\n");
  71   fprintf(stderr, "  -rotate [90|180|270]         Rotate image (degrees clockwise)\n");
  72   fprintf(stderr, "  -transpose     Transpose image\n");
  73   fprintf(stderr, "  -transverse    Transverse transpose image\n");
  74   fprintf(stderr, "  -trim          Drop non-transformable edge blocks\n");
  75 #endif /* TRANSFORMS_SUPPORTED */
  76   fprintf(stderr, "Switches for advanced users:\n");
  77   fprintf(stderr, "  -restart N     Set restart interval in rows, or in blocks with B\n");
  78   fprintf(stderr, "  -maxmemory N   Maximum memory to use (in kbytes)\n");
  79   fprintf(stderr, "  -outfile name  Specify name for output file\n");
  80   fprintf(stderr, "  -verbose  or  -debug   Emit debug output\n");
  81   fprintf(stderr, "Switches for wizards:\n");
  82 #ifdef C_ARITH_CODING_SUPPORTED
  83   fprintf(stderr, "  -arithmetic    Use arithmetic coding\n");
  84 #endif
  85 #ifdef C_MULTISCAN_FILES_SUPPORTED
  86   fprintf(stderr, "  -scans file    Create multi-scan JPEG per script file\n");
  87 #endif
  88   exit(EXIT_FAILURE);
  89 }
  90
  91
  92 LOCAL(void)
  93 select_transform (JXFORM_CODE transform)
  94 /* Silly little routine to detect multiple transform options,
  95  * which we can't handle.
  96  */
  97 {
  98 #if TRANSFORMS_SUPPORTED
  99   if (transformoption.transform == JXFORM_NONE ||
 100       transformoption.transform == transform) {
 101     transformoption.transform = transform;
 102   } else {
 103     fprintf(stderr, "%s: can only do one image transformation at a time\n",
 104             progname);
 105     usage();
 106   }
 107 #else
 108   fprintf(stderr, "%s: sorry, image transformation was not compiled\n",
 109           progname);
 110   exit(EXIT_FAILURE);
 111 #endif
 112 }
 113
 114
 115 LOCAL(int)
 116 parse_switches (j_compress_ptr cinfo, int argc, char **argv,
 117                 int last_file_arg_seen, boolean for_real)
 118 /* Parse optional switches.
 119  * Returns argv[] index of first file-name argument (== argc if none).
 120  * Any file names with indexes <= last_file_arg_seen are ignored;
 121  * they have presumably been processed in a previous iteration.
 122  * (Pass 0 for last_file_arg_seen on the first or only iteration.)
 123  * for_real is FALSE on the first (dummy) pass; we may skip any expensive
 124  * processing.
 125  */
 126 {
 127   int argn;
 128   char * arg;
 129   boolean simple_progressive;
 130   char * scansarg = NULL;       /* saves -scans parm if any */
 131
 132   /* Set up default JPEG parameters. */
 133   simple_progressive = FALSE;
 134   outfilename = NULL;
 135   copyoption = JCOPYOPT_DEFAULT;
 136   transformoption.transform = JXFORM_NONE;
 137   transformoption.trim = FALSE;
 138   transformoption.perfect = FALSE;
 139   transformoption.force_grayscale = FALSE;
 140   transformoption.crop = FALSE;
 141   cinfo->err->trace_level = 0;
 142
 143   /* Scan command line options, adjust parameters */
 144
 145   for (argn = 1; argn < argc; argn++) {
 146     arg = argv[argn];
 147     if (*arg != '-') {
 148       /* Not a switch, must be a file name argument */
 149       if (argn <= last_file_arg_seen) {
 150         outfilename = NULL;     /* -outfile applies to just one input file */
 151         continue;               /* ignore this name if previously processed */
 152       }
 153       break;                    /* else done parsing switches */
 154     }
 155     arg++;                      /* advance past switch marker character */
 156
 157     if (keymatch(arg, "arithmetic", 1)) {
 158       /* Use arithmetic coding. */
 159 #ifdef C_ARITH_CODING_SUPPORTED
 160       cinfo->arith_code = TRUE;
 161 #else
 162       fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",
 163               progname);
 164       exit(EXIT_FAILURE);
 165 #endif
 166
 167     } else if (keymatch(arg, "copy", 2)) {
 168       /* Select which extra markers to copy. */
 169       if (++argn >= argc)       /* advance to next argument */
 170         usage();
 171       if (keymatch(argv[argn], "none", 1)) {
 172         copyoption = JCOPYOPT_NONE;
 173       } else if (keymatch(argv[argn], "comments", 1)) {
 174         copyoption = JCOPYOPT_COMMENTS;
 175       } else if (keymatch(argv[argn], "all", 1)) {
 176         copyoption = JCOPYOPT_ALL;
 177       } else
 178         usage();
 179
 180     } else if (keymatch(arg, "crop", 2)) {
 181       /* Perform lossless cropping. */
 182 #if TRANSFORMS_SUPPORTED
 183       if (++argn >= argc)       /* advance to next argument */
 184         usage();
 185       if (! jtransform_parse_crop_spec(&transformoption, argv[argn])) {
 186         fprintf(stderr, "%s: bogus -crop argument '%s'\n",
 187                 progname, argv[argn]);
 188         exit(EXIT_FAILURE);
 189       }
 190 #else
 191       select_transform(JXFORM_NONE);    /* force an error */
 192 #endif
 193
 194     } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
 195       /* Enable debug printouts. */
 196       /* On first -d, print version identification */
 197       static boolean printed_version = FALSE;
 198
 199       if (! printed_version) {
 200         fprintf(stderr, "Independent JPEG Group's JPEGTRAN, version %s\n%s\n",
 201                 JVERSION, JCOPYRIGHT);
 202         printed_version = TRUE;
 203       }
 204       cinfo->err->trace_level++;
 205
 206     } else if (keymatch(arg, "flip", 1)) {
 207       /* Mirror left-right or top-bottom. */
 208       if (++argn >= argc)       /* advance to next argument */
 209         usage();
 210       if (keymatch(argv[argn], "horizontal", 1))
 211         select_transform(JXFORM_FLIP_H);
 212       else if (keymatch(argv[argn], "vertical", 1))
 213         select_transform(JXFORM_FLIP_V);
 214       else
 215         usage();
 216
 217     } else if (keymatch(arg, "grayscale", 1) || keymatch(arg, "greyscale",1)) {
 218       /* Force to grayscale. */
 219 #if TRANSFORMS_SUPPORTED
 220       transformoption.force_grayscale = TRUE;
 221 #else
 222       select_transform(JXFORM_NONE);    /* force an error */
 223 #endif
 224
 225     } else if (keymatch(arg, "maxmemory", 3)) {
 226       /* Maximum memory in Kb (or Mb with 'm'). */
 227       long lval;
 228       char ch = 'x';
 229
 230       if (++argn >= argc)       /* advance to next argument */
 231         usage();
 232       if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
 233         usage();
 234       if (ch == 'm' || ch == 'M')
 235         lval *= 1000L;
 236       cinfo->mem->max_memory_to_use = lval * 1000L;
 237
 238     } else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) {
 239       /* Enable entropy parm optimization. */
 240 #ifdef ENTROPY_OPT_SUPPORTED
 241       cinfo->optimize_coding = TRUE;
 242 #else
 243       fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n",
 244               progname);
 245       exit(EXIT_FAILURE);
 246 #endif
 247
 248     } else if (keymatch(arg, "outfile", 4)) {
 249       /* Set output file name. */
 250       if (++argn >= argc)       /* advance to next argument */
 251         usage();
 252       outfilename = argv[argn]; /* save it away for later use */
 253
 254     } else if (keymatch(arg, "perfect", 2)) {
 255       /* Fail if there is any partial edge MCUs that the transform can't
 256        * handle. */
 257       transformoption.perfect = TRUE;
 258
 259     } else if (keymatch(arg, "progressive", 2)) {
 260       /* Select simple progressive mode. */
 261 #ifdef C_PROGRESSIVE_SUPPORTED
 262       simple_progressive = TRUE;
 263       /* We must postpone execution until num_components is known. */
 264 #else
 265       fprintf(stderr, "%s: sorry, progressive output was not compiled\n",
 266               progname);
 267       exit(EXIT_FAILURE);
 268 #endif
 269
 270     } else if (keymatch(arg, "restart", 1)) {
 271       /* Restart interval in MCU rows (or in MCUs with 'b'). */
 272       long lval;
 273       char ch = 'x';
 274
 275       if (++argn >= argc)       /* advance to next argument */
 276         usage();
 277       if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
 278         usage();
 279       if (lval < 0 || lval > 65535L)
 280         usage();
 281       if (ch == 'b' || ch == 'B') {
 282         cinfo->restart_interval = (unsigned int) lval;
 283         cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */
 284       } else {
 285         cinfo->restart_in_rows = (int) lval;
 286         /* restart_interval will be computed during startup */
 287       }
 288
 289     } else if (keymatch(arg, "rotate", 2)) {
 290       /* Rotate 90, 180, or 270 degrees (measured clockwise). */
 291       if (++argn >= argc)       /* advance to next argument */
 292         usage();
 293       if (keymatch(argv[argn], "90", 2))
 294         select_transform(JXFORM_ROT_90);
 295       else if (keymatch(argv[argn], "180", 3))
 296         select_transform(JXFORM_ROT_180);
 297       else if (keymatch(argv[argn], "270", 3))
 298         select_transform(JXFORM_ROT_270);
 299       else
 300         usage();
 301
 302     } else if (keymatch(arg, "scans", 1)) {
 303       /* Set scan script. */
 304 #ifdef C_MULTISCAN_FILES_SUPPORTED
 305       if (++argn >= argc)       /* advance to next argument */
 306         usage();
 307       scansarg = argv[argn];
 308       /* We must postpone reading the file in case -progressive appears. */
 309 #else
 310       fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n",
 311               progname);
 312       exit(EXIT_FAILURE);
 313 #endif
 314
 315     } else if (keymatch(arg, "transpose", 1)) {
 316       /* Transpose (across UL-to-LR axis). */
 317       select_transform(JXFORM_TRANSPOSE);
 318
 319     } else if (keymatch(arg, "transverse", 6)) {
 320       /* Transverse transpose (across UR-to-LL axis). */
 321       select_transform(JXFORM_TRANSVERSE);
 322
 323     } else if (keymatch(arg, "trim", 3)) {
 324       /* Trim off any partial edge MCUs that the transform can't handle. */
 325       transformoption.trim = TRUE;
 326
 327     } else {
 328       usage();                  /* bogus switch */
 329     }
 330   }
 331
 332   /* Post-switch-scanning cleanup */
 333
 334   if (for_real) {
 335
 336 #ifdef C_PROGRESSIVE_SUPPORTED
 337     if (simple_progressive)     /* process -progressive; -scans can override */
 338       jpeg_simple_progression(cinfo);
 339 #endif
 340
 341 #ifdef C_MULTISCAN_FILES_SUPPORTED
 342     if (scansarg != NULL)       /* process -scans if it was present */
 343       if (! read_scan_script(cinfo, scansarg))
 344         usage();
 345 #endif
 346   }
 347
 348   return argn;                  /* return index of next arg (file name) */
 349 }
 350
 351
 352 /*
 353  * The main program.
 354  */
 355
 356 int
 357 main (int argc, char **argv)
 358 {
 359   struct jpeg_decompress_struct srcinfo;
 360   struct jpeg_compress_struct dstinfo;
 361   struct jpeg_error_mgr jsrcerr, jdsterr;
 362 #ifdef PROGRESS_REPORT
 363   struct cdjpeg_progress_mgr progress;
 364 #endif
 365   jvirt_barray_ptr * src_coef_arrays;
 366   jvirt_barray_ptr * dst_coef_arrays;
 367   int file_index;
 368   /* We assume all-in-memory processing and can therefore use only a
 369    * single file pointer for sequential input and output operation.
 370    */
 371   FILE * fp;
 372
 373   /* On Mac, fetch a command line. */
 374 #ifdef USE_CCOMMAND
 375   argc = ccommand(&argv);
 376 #endif
 377
 378   progname = argv[0];
 379   if (progname == NULL || progname[0] == 0)
 380     progname = "jpegtran";      /* in case C library doesn't provide it */
 381
 382   /* Initialize the JPEG decompression object with default error handling. */
 383   srcinfo.err = jpeg_std_error(&jsrcerr);
 384   jpeg_create_decompress(&srcinfo);
 385   /* Initialize the JPEG compression object with default error handling. */
 386   dstinfo.err = jpeg_std_error(&jdsterr);
 387   jpeg_create_compress(&dstinfo);
 388
 389   /* Now safe to enable signal catcher.
 390    * Note: we assume only the decompression object will have virtual arrays.
 391    */
 392 #ifdef NEED_SIGNAL_CATCHER
 393   enable_signal_catcher((j_common_ptr) &srcinfo);
 394 #endif
 395
 396   /* Scan command line to find file names.
 397    * It is convenient to use just one switch-parsing routine, but the switch
 398    * values read here are mostly ignored; we will rescan the switches after
 399    * opening the input file.  Also note that most of the switches affect the
 400    * destination JPEG object, so we parse into that and then copy over what
 401    * needs to affects the source too.
 402    */
 403
 404   file_index = parse_switches(&dstinfo, argc, argv, 0, FALSE);
 405   jsrcerr.trace_level = jdsterr.trace_level;
 406   srcinfo.mem->max_memory_to_use = dstinfo.mem->max_memory_to_use;
 407
 408 #ifdef TWO_FILE_COMMANDLINE
 409   /* Must have either -outfile switch or explicit output file name */
 410   if (outfilename == NULL) {
 411     if (file_index != argc-2) {
 412       fprintf(stderr, "%s: must name one input and one output file\n",
 413               progname);
 414       usage();
 415     }
 416     outfilename = argv[file_index+1];
 417   } else {
 418     if (file_index != argc-1) {
 419       fprintf(stderr, "%s: must name one input and one output file\n",
 420               progname);
 421       usage();
 422     }
 423   }
 424 #else
 425   /* Unix style: expect zero or one file name */
 426   if (file_index < argc-1) {
 427     fprintf(stderr, "%s: only one input file\n", progname);
 428     usage();
 429   }
 430 #endif /* TWO_FILE_COMMANDLINE */
 431
 432   /* Open the input file. */
 433   if (file_index < argc) {
 434     if ((fp = fopen(argv[file_index], READ_BINARY)) == NULL) {
 435       fprintf(stderr, "%s: can't open %s for reading\n", progname, argv[file_index]);
 436       exit(EXIT_FAILURE);
 437     }
 438   } else {
 439     /* default input file is stdin */
 440     fp = read_stdin();
 441   }
 442
 443 #ifdef PROGRESS_REPORT
 444   start_progress_monitor((j_common_ptr) &dstinfo, &progress);
 445 #endif
 446
 447   /* Specify data source for decompression */
 448   jpeg_stdio_src(&srcinfo, fp);
 449
 450   /* Enable saving of extra markers that we want to copy */
 451   jcopy_markers_setup(&srcinfo, copyoption);
 452
 453   /* Read file header */
 454   (void) jpeg_read_header(&srcinfo, TRUE);
 455
 456   /* Any space needed by a transform option must be requested before
 457    * jpeg_read_coefficients so that memory allocation will be done right.
 458    */
 459 #if TRANSFORMS_SUPPORTED
 460   /* Fails right away if -perfect is given and transformation is not perfect.
 461    */
 462   if (transformoption.perfect &&
 463       !jtransform_perfect_transform(srcinfo.image_width, srcinfo.image_height,
 464       srcinfo.max_h_samp_factor * DCTSIZE, srcinfo.max_v_samp_factor * DCTSIZE,
 465       transformoption.transform)) {
 466     fprintf(stderr, "%s: transformation is not perfect\n", progname);
 467     exit(EXIT_FAILURE);
 468   }
 469   jtransform_request_workspace(&srcinfo, &transformoption);
 470 #endif
 471
 472   /* Read source file as DCT coefficients */
 473   src_coef_arrays = jpeg_read_coefficients(&srcinfo);
 474
 475   /* Initialize destination compression parameters from source values */
 476   jpeg_copy_critical_parameters(&srcinfo, &dstinfo);
 477
 478   /* Adjust destination parameters if required by transform options;
 479    * also find out which set of coefficient arrays will hold the output.
 480    */
 481 #if TRANSFORMS_SUPPORTED
 482   dst_coef_arrays = jtransform_adjust_parameters(&srcinfo, &dstinfo,
 483                                                  src_coef_arrays,
 484                                                  &transformoption);
 485 #else
 486   dst_coef_arrays = src_coef_arrays;
 487 #endif
 488
 489   /* Close input file, if we opened it.
 490    * Note: we assume that jpeg_read_coefficients consumed all input
 491    * until JPEG_REACHED_EOI, and that jpeg_finish_decompress will
 492    * only consume more while (! cinfo->inputctl->eoi_reached).
 493    * We cannot call jpeg_finish_decompress here since we still need the
 494    * virtual arrays allocated from the source object for processing.
 495    */
 496   if (fp != stdin)
 497     fclose(fp);
 498
 499   /* Open the output file. */
 500   if (outfilename != NULL) {
 501     if ((fp = fopen(outfilename, WRITE_BINARY)) == NULL) {
 502       fprintf(stderr, "%s: can't open %s for writing\n", progname, outfilename);
 503       exit(EXIT_FAILURE);
 504     }
 505   } else {
 506     /* default output file is stdout */
 507     fp = write_stdout();
 508   }
 509
 510   /* Adjust default compression parameters by re-parsing the options */
 511   file_index = parse_switches(&dstinfo, argc, argv, 0, TRUE);
 512
 513   /* Specify data destination for compression */
 514   jpeg_stdio_dest(&dstinfo, fp);
 515
 516   /* Start compressor (note no image data is actually written here) */
 517   jpeg_write_coefficients(&dstinfo, dst_coef_arrays);
 518
 519   /* Copy to the output file any extra markers that we want to preserve */
 520   jcopy_markers_execute(&srcinfo, &dstinfo, copyoption);
 521
 522   /* Execute image transformation, if any */
 523 #if TRANSFORMS_SUPPORTED
 524   jtransform_execute_transformation(&srcinfo, &dstinfo,
 525                                     src_coef_arrays,
 526                                     &transformoption);
 527 #endif
 528
 529   /* Finish compression and release memory */
 530   jpeg_finish_compress(&dstinfo);
 531   jpeg_destroy_compress(&dstinfo);
 532   (void) jpeg_finish_decompress(&srcinfo);
 533   jpeg_destroy_decompress(&srcinfo);
 534
 535   /* Close output file, if we opened it */
 536   if (fp != stdout)
 537     fclose(fp);
 538
 539 #ifdef PROGRESS_REPORT
 540   end_progress_monitor((j_common_ptr) &dstinfo);
 541 #endif
 542
 543   /* All done. */
 544   exit(jsrcerr.num_warnings + jdsterr.num_warnings ?EXIT_WARNING:EXIT_SUCCESS);
 545   return 0;                     /* suppress no-return-value warnings */
 546 }