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