1/* 2 * djpeg.c 3 * 4 * Copyright (C) 1991-1997, Thomas G. Lane. 5 * Modified 2009 by Guido Vollbeding. 6 * This file is part of the Independent JPEG Group's software. 7 * For conditions of distribution and use, see the accompanying README file. 8 * 9 * This file contains a command-line user interface for the JPEG decompressor. 10 * It should work on any system with Unix- or MS-DOS-style command lines. 11 * 12 * Two different command line styles are permitted, depending on the 13 * compile-time switch TWO_FILE_COMMANDLINE: 14 * djpeg [options] inputfile outputfile 15 * djpeg [options] [inputfile] 16 * In the second style, output is always to standard output, which you'd 17 * normally redirect to a file or pipe to some other program. Input is 18 * either from a named file or from standard input (typically redirected). 19 * The second style is convenient on Unix but is unhelpful on systems that 20 * don't support pipes. Also, you MUST use the first style if your system 21 * doesn't do binary I/O to stdin/stdout. 22 * To simplify script writing, the "-outfile" switch is provided. The syntax 23 * djpeg [options] -outfile outputfile inputfile 24 * works regardless of which command line style is used. 25 */ 26 27#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ 28#include "jversion.h" /* for version message */ 29 30#include <ctype.h> /* to declare isprint() */ 31 32#ifdef USE_CCOMMAND /* command-line reader for Macintosh */ 33#ifdef __MWERKS__ 34#include <SIOUX.h> /* Metrowerks needs this */ 35#include <console.h> /* ... and this */ 36#endif 37#ifdef THINK_C 38#include <console.h> /* Think declares it here */ 39#endif 40#endif 41 42 43/* Create the add-on message string table. */ 44 45#define JMESSAGE(code,string) string , 46 47static const char * const cdjpeg_message_table[] = { 48#include "cderror.h" 49 NULL 50}; 51 52 53/* 54 * This list defines the known output image formats 55 * (not all of which need be supported by a given version). 56 * You can change the default output format by defining DEFAULT_FMT; 57 * indeed, you had better do so if you undefine PPM_SUPPORTED. 58 */ 59 60typedef enum { 61 FMT_BMP, /* BMP format (Windows flavor) */ 62 FMT_GIF, /* GIF format */ 63 FMT_OS2, /* BMP format (OS/2 flavor) */ 64 FMT_PPM, /* PPM/PGM (PBMPLUS formats) */ 65 FMT_RLE, /* RLE format */ 66 FMT_TARGA, /* Targa format */ 67 FMT_TIFF /* TIFF format */ 68} IMAGE_FORMATS; 69 70#ifndef DEFAULT_FMT /* so can override from CFLAGS in Makefile */ 71#define DEFAULT_FMT FMT_PPM 72#endif 73 74static IMAGE_FORMATS requested_fmt; 75 76 77/* 78 * Argument-parsing code. 79 * The switch parser is designed to be useful with DOS-style command line 80 * syntax, ie, intermixed switches and file names, where only the switches 81 * to the left of a given file name affect processing of that file. 82 * The main program in this file doesn't actually use this capability... 83 */ 84 85 86static const char * progname; /* program name for error messages */ 87static char * outfilename; /* for -outfile switch */ 88 89 90LOCAL(void) 91usage (void) 92/* complain about bad command line */ 93{ 94 fprintf(stderr, "usage: %s [switches] ", progname); 95#ifdef TWO_FILE_COMMANDLINE 96 fprintf(stderr, "inputfile outputfile\n"); 97#else 98 fprintf(stderr, "[inputfile]\n"); 99#endif 100 101 fprintf(stderr, "Switches (names may be abbreviated):\n"); 102 fprintf(stderr, " -colors N Reduce image to no more than N colors\n"); 103 fprintf(stderr, " -fast Fast, low-quality processing\n"); 104 fprintf(stderr, " -grayscale Force grayscale output\n"); 105#ifdef IDCT_SCALING_SUPPORTED 106 fprintf(stderr, " -scale M/N Scale output image by fraction M/N, eg, 1/8\n"); 107#endif 108#ifdef BMP_SUPPORTED 109 fprintf(stderr, " -bmp Select BMP output format (Windows style)%s\n", 110 (DEFAULT_FMT == FMT_BMP ? " (default)" : "")); 111#endif 112#ifdef GIF_SUPPORTED 113 fprintf(stderr, " -gif Select GIF output format%s\n", 114 (DEFAULT_FMT == FMT_GIF ? " (default)" : "")); 115#endif 116#ifdef BMP_SUPPORTED 117 fprintf(stderr, " -os2 Select BMP output format (OS/2 style)%s\n", 118 (DEFAULT_FMT == FMT_OS2 ? " (default)" : "")); 119#endif 120#ifdef PPM_SUPPORTED 121 fprintf(stderr, " -pnm Select PBMPLUS (PPM/PGM) output format%s\n", 122 (DEFAULT_FMT == FMT_PPM ? " (default)" : "")); 123#endif 124#ifdef RLE_SUPPORTED 125 fprintf(stderr, " -rle Select Utah RLE output format%s\n", 126 (DEFAULT_FMT == FMT_RLE ? " (default)" : "")); 127#endif 128#ifdef TARGA_SUPPORTED 129 fprintf(stderr, " -targa Select Targa output format%s\n", 130 (DEFAULT_FMT == FMT_TARGA ? " (default)" : "")); 131#endif 132 fprintf(stderr, "Switches for advanced users:\n"); 133#ifdef DCT_ISLOW_SUPPORTED 134 fprintf(stderr, " -dct int Use integer DCT method%s\n", 135 (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : "")); 136#endif 137#ifdef DCT_IFAST_SUPPORTED 138 fprintf(stderr, " -dct fast Use fast integer DCT (less accurate)%s\n", 139 (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : "")); 140#endif 141#ifdef DCT_FLOAT_SUPPORTED 142 fprintf(stderr, " -dct float Use floating-point DCT method%s\n", 143 (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : "")); 144#endif 145 fprintf(stderr, " -dither fs Use F-S dithering (default)\n"); 146 fprintf(stderr, " -dither none Don't use dithering in quantization\n"); 147 fprintf(stderr, " -dither ordered Use ordered dither (medium speed, quality)\n"); 148#ifdef QUANT_2PASS_SUPPORTED 149 fprintf(stderr, " -map FILE Map to colors used in named image file\n"); 150#endif 151 fprintf(stderr, " -nosmooth Don't use high-quality upsampling\n"); 152#ifdef QUANT_1PASS_SUPPORTED 153 fprintf(stderr, " -onepass Use 1-pass quantization (fast, low quality)\n"); 154#endif 155 fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n"); 156 fprintf(stderr, " -outfile name Specify name for output file\n"); 157 fprintf(stderr, " -verbose or -debug Emit debug output\n"); 158 exit(EXIT_FAILURE); 159} 160 161 162LOCAL(int) 163parse_switches (j_decompress_ptr cinfo, int argc, char **argv, 164 int last_file_arg_seen, boolean for_real) 165/* Parse optional switches. 166 * Returns argv[] index of first file-name argument (== argc if none). 167 * Any file names with indexes <= last_file_arg_seen are ignored; 168 * they have presumably been processed in a previous iteration. 169 * (Pass 0 for last_file_arg_seen on the first or only iteration.) 170 * for_real is FALSE on the first (dummy) pass; we may skip any expensive 171 * processing. 172 */ 173{ 174 int argn; 175 char * arg; 176 177 /* Set up default JPEG parameters. */ 178 requested_fmt = DEFAULT_FMT; /* set default output file format */ 179 outfilename = NULL; 180 cinfo->err->trace_level = 0; 181 182 /* Scan command line options, adjust parameters */ 183 184 for (argn = 1; argn < argc; argn++) { 185 arg = argv[argn]; 186 if (*arg != '-') { 187 /* Not a switch, must be a file name argument */ 188 if (argn <= last_file_arg_seen) { 189 outfilename = NULL; /* -outfile applies to just one input file */ 190 continue; /* ignore this name if previously processed */ 191 } 192 break; /* else done parsing switches */ 193 } 194 arg++; /* advance past switch marker character */ 195 196 if (keymatch(arg, "bmp", 1)) { 197 /* BMP output format. */ 198 requested_fmt = FMT_BMP; 199 200 } else if (keymatch(arg, "colors", 1) || keymatch(arg, "colours", 1) || 201 keymatch(arg, "quantize", 1) || keymatch(arg, "quantise", 1)) { 202 /* Do color quantization. */ 203 int val; 204 205 if (++argn >= argc) /* advance to next argument */ 206 usage(); 207 if (sscanf(argv[argn], "%d", &val) != 1) 208 usage(); 209 cinfo->desired_number_of_colors = val; 210 cinfo->quantize_colors = TRUE; 211 212 } else if (keymatch(arg, "dct", 2)) { 213 /* Select IDCT algorithm. */ 214 if (++argn >= argc) /* advance to next argument */ 215 usage(); 216 if (keymatch(argv[argn], "int", 1)) { 217 cinfo->dct_method = JDCT_ISLOW; 218 } else if (keymatch(argv[argn], "fast", 2)) { 219 cinfo->dct_method = JDCT_IFAST; 220 } else if (keymatch(argv[argn], "float", 2)) { 221 cinfo->dct_method = JDCT_FLOAT; 222 } else 223 usage(); 224 225 } else if (keymatch(arg, "dither", 2)) { 226 /* Select dithering algorithm. */ 227 if (++argn >= argc) /* advance to next argument */ 228 usage(); 229 if (keymatch(argv[argn], "fs", 2)) { 230 cinfo->dither_mode = JDITHER_FS; 231 } else if (keymatch(argv[argn], "none", 2)) { 232 cinfo->dither_mode = JDITHER_NONE; 233 } else if (keymatch(argv[argn], "ordered", 2)) { 234 cinfo->dither_mode = JDITHER_ORDERED; 235 } else 236 usage(); 237 238 } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) { 239 /* Enable debug printouts. */ 240 /* On first -d, print version identification */ 241 static boolean printed_version = FALSE; 242 243 if (! printed_version) { 244 fprintf(stderr, "Independent JPEG Group's DJPEG, version %s\n%s\n", 245 JVERSION, JCOPYRIGHT); 246 printed_version = TRUE; 247 } 248 cinfo->err->trace_level++; 249 250 } else if (keymatch(arg, "fast", 1)) { 251 /* Select recommended processing options for quick-and-dirty output. */ 252 cinfo->two_pass_quantize = FALSE; 253 cinfo->dither_mode = JDITHER_ORDERED; 254 if (! cinfo->quantize_colors) /* don't override an earlier -colors */ 255 cinfo->desired_number_of_colors = 216; 256 cinfo->dct_method = JDCT_FASTEST; 257 cinfo->do_fancy_upsampling = FALSE; 258 259 } else if (keymatch(arg, "gif", 1)) { 260 /* GIF output format. */ 261 requested_fmt = FMT_GIF; 262 263 } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) { 264 /* Force monochrome output. */ 265 cinfo->out_color_space = JCS_GRAYSCALE; 266 267 } else if (keymatch(arg, "map", 3)) { 268 /* Quantize to a color map taken from an input file. */ 269 if (++argn >= argc) /* advance to next argument */ 270 usage(); 271 if (for_real) { /* too expensive to do twice! */ 272#ifdef QUANT_2PASS_SUPPORTED /* otherwise can't quantize to supplied map */ 273 FILE * mapfile; 274 275 if ((mapfile = fopen(argv[argn], READ_BINARY)) == NULL) { 276 fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]); 277 exit(EXIT_FAILURE); 278 } 279 read_color_map(cinfo, mapfile); 280 fclose(mapfile); 281 cinfo->quantize_colors = TRUE; 282#else 283 ERREXIT(cinfo, JERR_NOT_COMPILED); 284#endif 285 } 286 287 } else if (keymatch(arg, "maxmemory", 3)) { 288 /* Maximum memory in Kb (or Mb with 'm'). */ 289 long lval; 290 char ch = 'x'; 291 292 if (++argn >= argc) /* advance to next argument */ 293 usage(); 294 if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1) 295 usage(); 296 if (ch == 'm' || ch == 'M') 297 lval *= 1000L; 298 cinfo->mem->max_memory_to_use = lval * 1000L; 299 300 } else if (keymatch(arg, "nosmooth", 3)) { 301 /* Suppress fancy upsampling */ 302 cinfo->do_fancy_upsampling = FALSE; 303 304 } else if (keymatch(arg, "onepass", 3)) { 305 /* Use fast one-pass quantization. */ 306 cinfo->two_pass_quantize = FALSE; 307 308 } else if (keymatch(arg, "os2", 3)) { 309 /* BMP output format (OS/2 flavor). */ 310 requested_fmt = FMT_OS2; 311 312 } else if (keymatch(arg, "outfile", 4)) { 313 /* Set output file name. */ 314 if (++argn >= argc) /* advance to next argument */ 315 usage(); 316 outfilename = argv[argn]; /* save it away for later use */ 317 318 } else if (keymatch(arg, "pnm", 1) || keymatch(arg, "ppm", 1)) { 319 /* PPM/PGM output format. */ 320 requested_fmt = FMT_PPM; 321 322 } else if (keymatch(arg, "rle", 1)) { 323 /* RLE output format. */ 324 requested_fmt = FMT_RLE; 325 326 } else if (keymatch(arg, "scale", 1)) { 327 /* Scale the output image by a fraction M/N. */ 328 if (++argn >= argc) /* advance to next argument */ 329 usage(); 330 if (sscanf(argv[argn], "%d/%d", 331 &cinfo->scale_num, &cinfo->scale_denom) < 1) 332 usage(); 333 334 } else if (keymatch(arg, "targa", 1)) { 335 /* Targa output format. */ 336 requested_fmt = FMT_TARGA; 337 338 } else { 339 usage(); /* bogus switch */ 340 } 341 } 342 343 return argn; /* return index of next arg (file name) */ 344} 345 346 347/* 348 * Marker processor for COM and interesting APPn markers. 349 * This replaces the library's built-in processor, which just skips the marker. 350 * We want to print out the marker as text, to the extent possible. 351 * Note this code relies on a non-suspending data source. 352 */ 353 354LOCAL(unsigned int) 355jpeg_getc (j_decompress_ptr cinfo) 356/* Read next byte */ 357{ 358 struct jpeg_source_mgr * datasrc = cinfo->src; 359 360 if (datasrc->bytes_in_buffer == 0) { 361 if (! (*datasrc->fill_input_buffer) (cinfo)) 362 ERREXIT(cinfo, JERR_CANT_SUSPEND); 363 } 364 datasrc->bytes_in_buffer--; 365 return GETJOCTET(*datasrc->next_input_byte++); 366} 367 368 369METHODDEF(boolean) 370print_text_marker (j_decompress_ptr cinfo) 371{ 372 boolean traceit = (cinfo->err->trace_level >= 1); 373 INT32 length; 374 unsigned int ch; 375 unsigned int lastch = 0; 376 377 length = jpeg_getc(cinfo) << 8; 378 length += jpeg_getc(cinfo); 379 length -= 2; /* discount the length word itself */ 380 381 if (traceit) { 382 if (cinfo->unread_marker == JPEG_COM) 383 fprintf(stderr, "Comment, length %ld:\n", (long) length); 384 else /* assume it is an APPn otherwise */ 385 fprintf(stderr, "APP%d, length %ld:\n", 386 cinfo->unread_marker - JPEG_APP0, (long) length); 387 } 388 389 while (--length >= 0) { 390 ch = jpeg_getc(cinfo); 391 if (traceit) { 392 /* Emit the character in a readable form. 393 * Nonprintables are converted to \nnn form, 394 * while \ is converted to \\. 395 * Newlines in CR, CR/LF, or LF form will be printed as one newline. 396 */ 397 if (ch == '\r') { 398 fprintf(stderr, "\n"); 399 } else if (ch == '\n') { 400 if (lastch != '\r') 401 fprintf(stderr, "\n"); 402 } else if (ch == '\\') { 403 fprintf(stderr, "\\\\"); 404 } else if (isprint(ch)) { 405 putc(ch, stderr); 406 } else { 407 fprintf(stderr, "\\%03o", ch); 408 } 409 lastch = ch; 410 } 411 } 412 413 if (traceit) 414 fprintf(stderr, "\n"); 415 416 return TRUE; 417} 418 419 420/* 421 * The main program. 422 */ 423 424int 425main (int argc, char **argv) 426{ 427 struct jpeg_decompress_struct cinfo; 428 struct jpeg_error_mgr jerr; 429#ifdef PROGRESS_REPORT 430 struct cdjpeg_progress_mgr progress; 431#endif 432 int file_index; 433 djpeg_dest_ptr dest_mgr = NULL; 434 FILE * input_file; 435 FILE * output_file; 436 JDIMENSION num_scanlines; 437 438 /* On Mac, fetch a command line. */ 439#ifdef USE_CCOMMAND 440 argc = ccommand(&argv); 441#endif 442 443 progname = argv[0]; 444 if (progname == NULL || progname[0] == 0) 445 progname = "djpeg"; /* in case C library doesn't provide it */ 446 447 /* Initialize the JPEG decompression object with default error handling. */ 448 cinfo.err = jpeg_std_error(&jerr); 449 jpeg_create_decompress(&cinfo); 450 /* Add some application-specific error messages (from cderror.h) */ 451 jerr.addon_message_table = cdjpeg_message_table; 452 jerr.first_addon_message = JMSG_FIRSTADDONCODE; 453 jerr.last_addon_message = JMSG_LASTADDONCODE; 454 455 /* Insert custom marker processor for COM and APP12. 456 * APP12 is used by some digital camera makers for textual info, 457 * so we provide the ability to display it as text. 458 * If you like, additional APPn marker types can be selected for display, 459 * but don't try to override APP0 or APP14 this way (see libjpeg.doc). 460 */ 461 jpeg_set_marker_processor(&cinfo, JPEG_COM, print_text_marker); 462 jpeg_set_marker_processor(&cinfo, JPEG_APP0+12, print_text_marker); 463 464 /* Now safe to enable signal catcher. */ 465#ifdef NEED_SIGNAL_CATCHER 466 enable_signal_catcher((j_common_ptr) &cinfo); 467#endif 468 469 /* Scan command line to find file names. */ 470 /* It is convenient to use just one switch-parsing routine, but the switch 471 * values read here are ignored; we will rescan the switches after opening 472 * the input file. 473 * (Exception: tracing level set here controls verbosity for COM markers 474 * found during jpeg_read_header...) 475 */ 476 477 file_index = parse_switches(&cinfo, argc, argv, 0, FALSE); 478 479#ifdef TWO_FILE_COMMANDLINE 480 /* Must have either -outfile switch or explicit output file name */ 481 if (outfilename == NULL) { 482 if (file_index != argc-2) { 483 fprintf(stderr, "%s: must name one input and one output file\n", 484 progname); 485 usage(); 486 } 487 outfilename = argv[file_index+1]; 488 } else { 489 if (file_index != argc-1) { 490 fprintf(stderr, "%s: must name one input and one output file\n", 491 progname); 492 usage(); 493 } 494 } 495#else 496 /* Unix style: expect zero or one file name */ 497 if (file_index < argc-1) { 498 fprintf(stderr, "%s: only one input file\n", progname); 499 usage(); 500 } 501#endif /* TWO_FILE_COMMANDLINE */ 502 503 /* Open the input file. */ 504 if (file_index < argc) { 505 if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) { 506 fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]); 507 exit(EXIT_FAILURE); 508 } 509 } else { 510 /* default input file is stdin */ 511 input_file = read_stdin(); 512 } 513 514 /* Open the output file. */ 515 if (outfilename != NULL) { 516 if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) { 517 fprintf(stderr, "%s: can't open %s\n", progname, outfilename); 518 exit(EXIT_FAILURE); 519 } 520 } else { 521 /* default output file is stdout */ 522 output_file = write_stdout(); 523 } 524 525#ifdef PROGRESS_REPORT 526 start_progress_monitor((j_common_ptr) &cinfo, &progress); 527#endif 528 529 /* Specify data source for decompression */ 530 jpeg_stdio_src(&cinfo, input_file); 531 532 /* Read file header, set default decompression parameters */ 533 (void) jpeg_read_header(&cinfo, TRUE); 534 535 /* Adjust default decompression parameters by re-parsing the options */ 536 file_index = parse_switches(&cinfo, argc, argv, 0, TRUE); 537 538 /* Initialize the output module now to let it override any crucial 539 * option settings (for instance, GIF wants to force color quantization). 540 */ 541 switch (requested_fmt) { 542#ifdef BMP_SUPPORTED 543 case FMT_BMP: 544 dest_mgr = jinit_write_bmp(&cinfo, FALSE); 545 break; 546 case FMT_OS2: 547 dest_mgr = jinit_write_bmp(&cinfo, TRUE); 548 break; 549#endif 550#ifdef GIF_SUPPORTED 551 case FMT_GIF: 552 dest_mgr = jinit_write_gif(&cinfo); 553 break; 554#endif 555#ifdef PPM_SUPPORTED 556 case FMT_PPM: 557 dest_mgr = jinit_write_ppm(&cinfo); 558 break; 559#endif 560#ifdef RLE_SUPPORTED 561 case FMT_RLE: 562 dest_mgr = jinit_write_rle(&cinfo); 563 break; 564#endif 565#ifdef TARGA_SUPPORTED 566 case FMT_TARGA: 567 dest_mgr = jinit_write_targa(&cinfo); 568 break; 569#endif 570 default: 571 ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT); 572 break; 573 } 574 dest_mgr->output_file = output_file; 575 576 /* Start decompressor */ 577 (void) jpeg_start_decompress(&cinfo); 578 579 /* Write output file header */ 580 (*dest_mgr->start_output) (&cinfo, dest_mgr); 581 582 /* Process data */ 583 while (cinfo.output_scanline < cinfo.output_height) { 584 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer, 585 dest_mgr->buffer_height); 586 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines); 587 } 588 589#ifdef PROGRESS_REPORT 590 /* Hack: count final pass as done in case finish_output does an extra pass. 591 * The library won't have updated completed_passes. 592 */ 593 progress.pub.completed_passes = progress.pub.total_passes; 594#endif 595 596 /* Finish decompression and release memory. 597 * I must do it in this order because output module has allocated memory 598 * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory. 599 */ 600 (*dest_mgr->finish_output) (&cinfo, dest_mgr); 601 (void) jpeg_finish_decompress(&cinfo); 602 jpeg_destroy_decompress(&cinfo); 603 604 /* Close files, if we opened them */ 605 if (input_file != stdin) 606 fclose(input_file); 607 if (output_file != stdout) 608 fclose(output_file); 609 610#ifdef PROGRESS_REPORT 611 end_progress_monitor((j_common_ptr) &cinfo); 612#endif 613 614 /* All done. */ 615 exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS); 616 return 0; /* suppress no-return-value warnings */ 617} 618