1 /* 2 * djpeg.c 3 * 4 * This file was part of the Independent JPEG Group's software: 5 * Copyright (C) 1991-1997, Thomas G. Lane. 6 * Modified 2013 by Guido Vollbeding. 7 * libjpeg-turbo Modifications: 8 * Copyright (C) 2010-2011, 2013-2017, D. R. Commander. 9 * Copyright (C) 2015, Google, Inc. 10 * For conditions of distribution and use, see the accompanying README.ijg 11 * file. 12 * 13 * This file contains a command-line user interface for the JPEG decompressor. 14 * It should work on any system with Unix- or MS-DOS-style command lines. 15 * 16 * Two different command line styles are permitted, depending on the 17 * compile-time switch TWO_FILE_COMMANDLINE: 18 * djpeg [options] inputfile outputfile 19 * djpeg [options] [inputfile] 20 * In the second style, output is always to standard output, which you'd 21 * normally redirect to a file or pipe to some other program. Input is 22 * either from a named file or from standard input (typically redirected). 23 * The second style is convenient on Unix but is unhelpful on systems that 24 * don't support pipes. Also, you MUST use the first style if your system 25 * doesn't do binary I/O to stdin/stdout. 26 * To simplify script writing, the "-outfile" switch is provided. The syntax 27 * djpeg [options] -outfile outputfile inputfile 28 * works regardless of which command line style is used. 29 */ 30 31 #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ 32 #include "jversion.h" /* for version message */ 33 #include "jconfigint.h" 34 35 #include <ctype.h> /* to declare isprint() */ 36 37 #ifdef USE_CCOMMAND /* command-line reader for Macintosh */ 38 #ifdef __MWERKS__ 39 #include <SIOUX.h> /* Metrowerks needs this */ 40 #include <console.h> /* ... and this */ 41 #endif 42 #ifdef THINK_C 43 #include <console.h> /* Think declares it here */ 44 #endif 45 #endif 46 47 48 /* Create the add-on message string table. */ 49 50 #define JMESSAGE(code,string) string , 51 52 static const char * const cdjpeg_message_table[] = { 53 #include "cderror.h" 54 NULL 55 }; 56 57 58 /* 59 * This list defines the known output image formats 60 * (not all of which need be supported by a given version). 61 * You can change the default output format by defining DEFAULT_FMT; 62 * indeed, you had better do so if you undefine PPM_SUPPORTED. 63 */ 64 65 typedef enum { 66 FMT_BMP, /* BMP format (Windows flavor) */ 67 FMT_GIF, /* GIF format */ 68 FMT_OS2, /* BMP format (OS/2 flavor) */ 69 FMT_PPM, /* PPM/PGM (PBMPLUS formats) */ 70 FMT_RLE, /* RLE format */ 71 FMT_TARGA, /* Targa format */ 72 FMT_TIFF /* TIFF format */ 73 } IMAGE_FORMATS; 74 75 #ifndef DEFAULT_FMT /* so can override from CFLAGS in Makefile */ 76 #define DEFAULT_FMT FMT_PPM 77 #endif 78 79 static IMAGE_FORMATS requested_fmt; 80 81 82 /* 83 * Argument-parsing code. 84 * The switch parser is designed to be useful with DOS-style command line 85 * syntax, ie, intermixed switches and file names, where only the switches 86 * to the left of a given file name affect processing of that file. 87 * The main program in this file doesn't actually use this capability... 88 */ 89 90 91 static const char *progname; /* program name for error messages */ 92 static char *outfilename; /* for -outfile switch */ 93 boolean memsrc; /* for -memsrc switch */ 94 boolean skip, crop; 95 JDIMENSION skip_start, skip_end; 96 JDIMENSION crop_x, crop_y, crop_width, crop_height; 97 #define INPUT_BUF_SIZE 4096 98 99 100 LOCAL(void) 101 usage (void) 102 /* complain about bad command line */ 103 { 104 fprintf(stderr, "usage: %s [switches] ", progname); 105 #ifdef TWO_FILE_COMMANDLINE 106 fprintf(stderr, "inputfile outputfile\n"); 107 #else 108 fprintf(stderr, "[inputfile]\n"); 109 #endif 110 111 fprintf(stderr, "Switches (names may be abbreviated):\n"); 112 fprintf(stderr, " -colors N Reduce image to no more than N colors\n"); 113 fprintf(stderr, " -fast Fast, low-quality processing\n"); 114 fprintf(stderr, " -grayscale Force grayscale output\n"); 115 fprintf(stderr, " -rgb Force RGB output\n"); 116 fprintf(stderr, " -rgb565 Force RGB565 output\n"); 117 #ifdef IDCT_SCALING_SUPPORTED 118 fprintf(stderr, " -scale M/N Scale output image by fraction M/N, eg, 1/8\n"); 119 #endif 120 #ifdef BMP_SUPPORTED 121 fprintf(stderr, " -bmp Select BMP output format (Windows style)%s\n", 122 (DEFAULT_FMT == FMT_BMP ? " (default)" : "")); 123 #endif 124 #ifdef GIF_SUPPORTED 125 fprintf(stderr, " -gif Select GIF output format%s\n", 126 (DEFAULT_FMT == FMT_GIF ? " (default)" : "")); 127 #endif 128 #ifdef BMP_SUPPORTED 129 fprintf(stderr, " -os2 Select BMP output format (OS/2 style)%s\n", 130 (DEFAULT_FMT == FMT_OS2 ? " (default)" : "")); 131 #endif 132 #ifdef PPM_SUPPORTED 133 fprintf(stderr, " -pnm Select PBMPLUS (PPM/PGM) output format%s\n", 134 (DEFAULT_FMT == FMT_PPM ? " (default)" : "")); 135 #endif 136 #ifdef RLE_SUPPORTED 137 fprintf(stderr, " -rle Select Utah RLE output format%s\n", 138 (DEFAULT_FMT == FMT_RLE ? " (default)" : "")); 139 #endif 140 #ifdef TARGA_SUPPORTED 141 fprintf(stderr, " -targa Select Targa output format%s\n", 142 (DEFAULT_FMT == FMT_TARGA ? " (default)" : "")); 143 #endif 144 fprintf(stderr, "Switches for advanced users:\n"); 145 #ifdef DCT_ISLOW_SUPPORTED 146 fprintf(stderr, " -dct int Use integer DCT method%s\n", 147 (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : "")); 148 #endif 149 #ifdef DCT_IFAST_SUPPORTED 150 fprintf(stderr, " -dct fast Use fast integer DCT (less accurate)%s\n", 151 (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : "")); 152 #endif 153 #ifdef DCT_FLOAT_SUPPORTED 154 fprintf(stderr, " -dct float Use floating-point DCT method%s\n", 155 (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : "")); 156 #endif 157 fprintf(stderr, " -dither fs Use F-S dithering (default)\n"); 158 fprintf(stderr, " -dither none Don't use dithering in quantization\n"); 159 fprintf(stderr, " -dither ordered Use ordered dither (medium speed, quality)\n"); 160 #ifdef QUANT_2PASS_SUPPORTED 161 fprintf(stderr, " -map FILE Map to colors used in named image file\n"); 162 #endif 163 fprintf(stderr, " -nosmooth Don't use high-quality upsampling\n"); 164 #ifdef QUANT_1PASS_SUPPORTED 165 fprintf(stderr, " -onepass Use 1-pass quantization (fast, low quality)\n"); 166 #endif 167 fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n"); 168 fprintf(stderr, " -outfile name Specify name for output file\n"); 169 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED) 170 fprintf(stderr, " -memsrc Load input file into memory before decompressing\n"); 171 #endif 172 173 fprintf(stderr, " -skip Y0,Y1 Decompress all rows except those between Y0 and Y1 (inclusive)\n"); 174 fprintf(stderr, " -crop WxH+X+Y Decompress only a rectangular subregion of the image\n"); 175 fprintf(stderr, " [requires PBMPLUS (PPM/PGM), GIF, or Targa output format]\n"); 176 fprintf(stderr, " -verbose or -debug Emit debug output\n"); 177 fprintf(stderr, " -version Print version information and exit\n"); 178 exit(EXIT_FAILURE); 179 } 180 181 182 LOCAL(int) 183 parse_switches (j_decompress_ptr cinfo, int argc, char **argv, 184 int last_file_arg_seen, boolean for_real) 185 /* Parse optional switches. 186 * Returns argv[] index of first file-name argument (== argc if none). 187 * Any file names with indexes <= last_file_arg_seen are ignored; 188 * they have presumably been processed in a previous iteration. 189 * (Pass 0 for last_file_arg_seen on the first or only iteration.) 190 * for_real is FALSE on the first (dummy) pass; we may skip any expensive 191 * processing. 192 */ 193 { 194 int argn; 195 char *arg; 196 197 /* Set up default JPEG parameters. */ 198 requested_fmt = DEFAULT_FMT; /* set default output file format */ 199 outfilename = NULL; 200 memsrc = FALSE; 201 skip = FALSE; 202 crop = FALSE; 203 cinfo->err->trace_level = 0; 204 205 /* Scan command line options, adjust parameters */ 206 207 for (argn = 1; argn < argc; argn++) { 208 arg = argv[argn]; 209 if (*arg != '-') { 210 /* Not a switch, must be a file name argument */ 211 if (argn <= last_file_arg_seen) { 212 outfilename = NULL; /* -outfile applies to just one input file */ 213 continue; /* ignore this name if previously processed */ 214 } 215 break; /* else done parsing switches */ 216 } 217 arg++; /* advance past switch marker character */ 218 219 if (keymatch(arg, "bmp", 1)) { 220 /* BMP output format. */ 221 requested_fmt = FMT_BMP; 222 223 } else if (keymatch(arg, "colors", 1) || keymatch(arg, "colours", 1) || 224 keymatch(arg, "quantize", 1) || keymatch(arg, "quantise", 1)) { 225 /* Do color quantization. */ 226 int val; 227 228 if (++argn >= argc) /* advance to next argument */ 229 usage(); 230 if (sscanf(argv[argn], "%d", &val) != 1) 231 usage(); 232 cinfo->desired_number_of_colors = val; 233 cinfo->quantize_colors = TRUE; 234 235 } else if (keymatch(arg, "dct", 2)) { 236 /* Select IDCT algorithm. */ 237 if (++argn >= argc) /* advance to next argument */ 238 usage(); 239 if (keymatch(argv[argn], "int", 1)) { 240 cinfo->dct_method = JDCT_ISLOW; 241 } else if (keymatch(argv[argn], "fast", 2)) { 242 cinfo->dct_method = JDCT_IFAST; 243 } else if (keymatch(argv[argn], "float", 2)) { 244 cinfo->dct_method = JDCT_FLOAT; 245 } else 246 usage(); 247 248 } else if (keymatch(arg, "dither", 2)) { 249 /* Select dithering algorithm. */ 250 if (++argn >= argc) /* advance to next argument */ 251 usage(); 252 if (keymatch(argv[argn], "fs", 2)) { 253 cinfo->dither_mode = JDITHER_FS; 254 } else if (keymatch(argv[argn], "none", 2)) { 255 cinfo->dither_mode = JDITHER_NONE; 256 } else if (keymatch(argv[argn], "ordered", 2)) { 257 cinfo->dither_mode = JDITHER_ORDERED; 258 } else 259 usage(); 260 261 } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) { 262 /* Enable debug printouts. */ 263 /* On first -d, print version identification */ 264 static boolean printed_version = FALSE; 265 266 if (! printed_version) { 267 fprintf(stderr, "%s version %s (build %s)\n", 268 PACKAGE_NAME, VERSION, BUILD); 269 fprintf(stderr, "%s\n\n", JCOPYRIGHT); 270 fprintf(stderr, "Emulating The Independent JPEG Group's software, version %s\n\n", 271 JVERSION); 272 printed_version = TRUE; 273 } 274 cinfo->err->trace_level++; 275 276 } else if (keymatch(arg, "version", 4)) { 277 fprintf(stderr, "%s version %s (build %s)\n", 278 PACKAGE_NAME, VERSION, BUILD); 279 exit(EXIT_SUCCESS); 280 281 } else if (keymatch(arg, "fast", 1)) { 282 /* Select recommended processing options for quick-and-dirty output. */ 283 cinfo->two_pass_quantize = FALSE; 284 cinfo->dither_mode = JDITHER_ORDERED; 285 if (! cinfo->quantize_colors) /* don't override an earlier -colors */ 286 cinfo->desired_number_of_colors = 216; 287 cinfo->dct_method = JDCT_FASTEST; 288 cinfo->do_fancy_upsampling = FALSE; 289 290 } else if (keymatch(arg, "gif", 1)) { 291 /* GIF output format. */ 292 requested_fmt = FMT_GIF; 293 294 } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) { 295 /* Force monochrome output. */ 296 cinfo->out_color_space = JCS_GRAYSCALE; 297 298 } else if (keymatch(arg, "rgb", 2)) { 299 /* Force RGB output. */ 300 cinfo->out_color_space = JCS_RGB; 301 302 } else if (keymatch(arg, "rgb565", 2)) { 303 /* Force RGB565 output. */ 304 cinfo->out_color_space = JCS_RGB565; 305 306 } else if (keymatch(arg, "map", 3)) { 307 /* Quantize to a color map taken from an input file. */ 308 if (++argn >= argc) /* advance to next argument */ 309 usage(); 310 if (for_real) { /* too expensive to do twice! */ 311 #ifdef QUANT_2PASS_SUPPORTED /* otherwise can't quantize to supplied map */ 312 FILE *mapfile; 313 314 if ((mapfile = fopen(argv[argn], READ_BINARY)) == NULL) { 315 fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]); 316 exit(EXIT_FAILURE); 317 } 318 read_color_map(cinfo, mapfile); 319 fclose(mapfile); 320 cinfo->quantize_colors = TRUE; 321 #else 322 ERREXIT(cinfo, JERR_NOT_COMPILED); 323 #endif 324 } 325 326 } else if (keymatch(arg, "maxmemory", 3)) { 327 /* Maximum memory in Kb (or Mb with 'm'). */ 328 long lval; 329 char ch = 'x'; 330 331 if (++argn >= argc) /* advance to next argument */ 332 usage(); 333 if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1) 334 usage(); 335 if (ch == 'm' || ch == 'M') 336 lval *= 1000L; 337 cinfo->mem->max_memory_to_use = lval * 1000L; 338 339 } else if (keymatch(arg, "nosmooth", 3)) { 340 /* Suppress fancy upsampling */ 341 cinfo->do_fancy_upsampling = FALSE; 342 343 } else if (keymatch(arg, "onepass", 3)) { 344 /* Use fast one-pass quantization. */ 345 cinfo->two_pass_quantize = FALSE; 346 347 } else if (keymatch(arg, "os2", 3)) { 348 /* BMP output format (OS/2 flavor). */ 349 requested_fmt = FMT_OS2; 350 351 } else if (keymatch(arg, "outfile", 4)) { 352 /* Set output file name. */ 353 if (++argn >= argc) /* advance to next argument */ 354 usage(); 355 outfilename = argv[argn]; /* save it away for later use */ 356 357 } else if (keymatch(arg, "memsrc", 2)) { 358 /* Use in-memory source manager */ 359 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED) 360 memsrc = TRUE; 361 #else 362 fprintf(stderr, "%s: sorry, in-memory source manager was not compiled in\n", 363 progname); 364 exit(EXIT_FAILURE); 365 #endif 366 367 } else if (keymatch(arg, "pnm", 1) || keymatch(arg, "ppm", 1)) { 368 /* PPM/PGM output format. */ 369 requested_fmt = FMT_PPM; 370 371 } else if (keymatch(arg, "rle", 1)) { 372 /* RLE output format. */ 373 requested_fmt = FMT_RLE; 374 375 } else if (keymatch(arg, "scale", 2)) { 376 /* Scale the output image by a fraction M/N. */ 377 if (++argn >= argc) /* advance to next argument */ 378 usage(); 379 if (sscanf(argv[argn], "%u/%u", 380 &cinfo->scale_num, &cinfo->scale_denom) != 2) 381 usage(); 382 383 } else if (keymatch(arg, "skip", 2)) { 384 if (++argn >= argc) 385 usage(); 386 if (sscanf(argv[argn], "%u,%u", &skip_start, &skip_end) != 2 || 387 skip_start > skip_end) 388 usage(); 389 skip = TRUE; 390 391 } else if (keymatch(arg, "crop", 2)) { 392 char c; 393 if (++argn >= argc) 394 usage(); 395 if (sscanf(argv[argn], "%u%c%u+%u+%u", &crop_width, &c, &crop_height, 396 &crop_x, &crop_y) != 5 || 397 (c != 'X' && c != 'x') || crop_width < 1 || crop_height < 1) 398 usage(); 399 crop = TRUE; 400 401 } else if (keymatch(arg, "targa", 1)) { 402 /* Targa output format. */ 403 requested_fmt = FMT_TARGA; 404 405 } else { 406 usage(); /* bogus switch */ 407 } 408 } 409 410 return argn; /* return index of next arg (file name) */ 411 } 412 413 414 /* 415 * Marker processor for COM and interesting APPn markers. 416 * This replaces the library's built-in processor, which just skips the marker. 417 * We want to print out the marker as text, to the extent possible. 418 * Note this code relies on a non-suspending data source. 419 */ 420 421 LOCAL(unsigned int) 422 jpeg_getc (j_decompress_ptr cinfo) 423 /* Read next byte */ 424 { 425 struct jpeg_source_mgr *datasrc = cinfo->src; 426 427 if (datasrc->bytes_in_buffer == 0) { 428 if (! (*datasrc->fill_input_buffer) (cinfo)) 429 ERREXIT(cinfo, JERR_CANT_SUSPEND); 430 } 431 datasrc->bytes_in_buffer--; 432 return GETJOCTET(*datasrc->next_input_byte++); 433 } 434 435 436 METHODDEF(boolean) 437 print_text_marker (j_decompress_ptr cinfo) 438 { 439 boolean traceit = (cinfo->err->trace_level >= 1); 440 long length; 441 unsigned int ch; 442 unsigned int lastch = 0; 443 444 length = jpeg_getc(cinfo) << 8; 445 length += jpeg_getc(cinfo); 446 length -= 2; /* discount the length word itself */ 447 448 if (traceit) { 449 if (cinfo->unread_marker == JPEG_COM) 450 fprintf(stderr, "Comment, length %ld:\n", (long) length); 451 else /* assume it is an APPn otherwise */ 452 fprintf(stderr, "APP%d, length %ld:\n", 453 cinfo->unread_marker - JPEG_APP0, (long) length); 454 } 455 456 while (--length >= 0) { 457 ch = jpeg_getc(cinfo); 458 if (traceit) { 459 /* Emit the character in a readable form. 460 * Nonprintables are converted to \nnn form, 461 * while \ is converted to \\. 462 * Newlines in CR, CR/LF, or LF form will be printed as one newline. 463 */ 464 if (ch == '\r') { 465 fprintf(stderr, "\n"); 466 } else if (ch == '\n') { 467 if (lastch != '\r') 468 fprintf(stderr, "\n"); 469 } else if (ch == '\\') { 470 fprintf(stderr, "\\\\"); 471 } else if (isprint(ch)) { 472 putc(ch, stderr); 473 } else { 474 fprintf(stderr, "\\%03o", ch); 475 } 476 lastch = ch; 477 } 478 } 479 480 if (traceit) 481 fprintf(stderr, "\n"); 482 483 return TRUE; 484 } 485 486 487 /* 488 * The main program. 489 */ 490 491 int 492 main (int argc, char **argv) 493 { 494 struct jpeg_decompress_struct cinfo; 495 struct jpeg_error_mgr jerr; 496 #ifdef PROGRESS_REPORT 497 struct cdjpeg_progress_mgr progress; 498 #endif 499 int file_index; 500 djpeg_dest_ptr dest_mgr = NULL; 501 FILE *input_file; 502 FILE *output_file; 503 unsigned char *inbuffer = NULL; 504 unsigned long insize = 0; 505 JDIMENSION num_scanlines; 506 507 /* On Mac, fetch a command line. */ 508 #ifdef USE_CCOMMAND 509 argc = ccommand(&argv); 510 #endif 511 512 progname = argv[0]; 513 if (progname == NULL || progname[0] == 0) 514 progname = "djpeg"; /* in case C library doesn't provide it */ 515 516 /* Initialize the JPEG decompression object with default error handling. */ 517 cinfo.err = jpeg_std_error(&jerr); 518 jpeg_create_decompress(&cinfo); 519 /* Add some application-specific error messages (from cderror.h) */ 520 jerr.addon_message_table = cdjpeg_message_table; 521 jerr.first_addon_message = JMSG_FIRSTADDONCODE; 522 jerr.last_addon_message = JMSG_LASTADDONCODE; 523 524 /* Insert custom marker processor for COM and APP12. 525 * APP12 is used by some digital camera makers for textual info, 526 * so we provide the ability to display it as text. 527 * If you like, additional APPn marker types can be selected for display, 528 * but don't try to override APP0 or APP14 this way (see libjpeg.txt). 529 */ 530 jpeg_set_marker_processor(&cinfo, JPEG_COM, print_text_marker); 531 jpeg_set_marker_processor(&cinfo, JPEG_APP0+12, print_text_marker); 532 533 /* Scan command line to find file names. */ 534 /* It is convenient to use just one switch-parsing routine, but the switch 535 * values read here are ignored; we will rescan the switches after opening 536 * the input file. 537 * (Exception: tracing level set here controls verbosity for COM markers 538 * found during jpeg_read_header...) 539 */ 540 541 file_index = parse_switches(&cinfo, argc, argv, 0, FALSE); 542 543 #ifdef TWO_FILE_COMMANDLINE 544 /* Must have either -outfile switch or explicit output file name */ 545 if (outfilename == NULL) { 546 if (file_index != argc-2) { 547 fprintf(stderr, "%s: must name one input and one output file\n", 548 progname); 549 usage(); 550 } 551 outfilename = argv[file_index+1]; 552 } else { 553 if (file_index != argc-1) { 554 fprintf(stderr, "%s: must name one input and one output file\n", 555 progname); 556 usage(); 557 } 558 } 559 #else 560 /* Unix style: expect zero or one file name */ 561 if (file_index < argc-1) { 562 fprintf(stderr, "%s: only one input file\n", progname); 563 usage(); 564 } 565 #endif /* TWO_FILE_COMMANDLINE */ 566 567 /* Open the input file. */ 568 if (file_index < argc) { 569 if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) { 570 fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]); 571 exit(EXIT_FAILURE); 572 } 573 } else { 574 /* default input file is stdin */ 575 input_file = read_stdin(); 576 } 577 578 /* Open the output file. */ 579 if (outfilename != NULL) { 580 if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) { 581 fprintf(stderr, "%s: can't open %s\n", progname, outfilename); 582 exit(EXIT_FAILURE); 583 } 584 } else { 585 /* default output file is stdout */ 586 output_file = write_stdout(); 587 } 588 589 #ifdef PROGRESS_REPORT 590 start_progress_monitor((j_common_ptr) &cinfo, &progress); 591 #endif 592 593 /* Specify data source for decompression */ 594 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED) 595 if (memsrc) { 596 size_t nbytes; 597 do { 598 inbuffer = (unsigned char *)realloc(inbuffer, insize + INPUT_BUF_SIZE); 599 if (inbuffer == NULL) { 600 fprintf(stderr, "%s: memory allocation failure\n", progname); 601 exit(EXIT_FAILURE); 602 } 603 nbytes = JFREAD(input_file, &inbuffer[insize], INPUT_BUF_SIZE); 604 if (nbytes < INPUT_BUF_SIZE && ferror(input_file)) { 605 if (file_index < argc) 606 fprintf(stderr, "%s: can't read from %s\n", progname, 607 argv[file_index]); 608 else 609 fprintf(stderr, "%s: can't read from stdin\n", progname); 610 } 611 insize += (unsigned long)nbytes; 612 } while (nbytes == INPUT_BUF_SIZE); 613 fprintf(stderr, "Compressed size: %lu bytes\n", insize); 614 jpeg_mem_src(&cinfo, inbuffer, insize); 615 } else 616 #endif 617 jpeg_stdio_src(&cinfo, input_file); 618 619 /* Read file header, set default decompression parameters */ 620 (void) jpeg_read_header(&cinfo, TRUE); 621 622 /* Adjust default decompression parameters by re-parsing the options */ 623 file_index = parse_switches(&cinfo, argc, argv, 0, TRUE); 624 625 /* Initialize the output module now to let it override any crucial 626 * option settings (for instance, GIF wants to force color quantization). 627 */ 628 switch (requested_fmt) { 629 #ifdef BMP_SUPPORTED 630 case FMT_BMP: 631 dest_mgr = jinit_write_bmp(&cinfo, FALSE); 632 break; 633 case FMT_OS2: 634 dest_mgr = jinit_write_bmp(&cinfo, TRUE); 635 break; 636 #endif 637 #ifdef GIF_SUPPORTED 638 case FMT_GIF: 639 dest_mgr = jinit_write_gif(&cinfo); 640 break; 641 #endif 642 #ifdef PPM_SUPPORTED 643 case FMT_PPM: 644 dest_mgr = jinit_write_ppm(&cinfo); 645 break; 646 #endif 647 #ifdef RLE_SUPPORTED 648 case FMT_RLE: 649 dest_mgr = jinit_write_rle(&cinfo); 650 break; 651 #endif 652 #ifdef TARGA_SUPPORTED 653 case FMT_TARGA: 654 dest_mgr = jinit_write_targa(&cinfo); 655 break; 656 #endif 657 default: 658 ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT); 659 break; 660 } 661 dest_mgr->output_file = output_file; 662 663 /* Start decompressor */ 664 (void) jpeg_start_decompress(&cinfo); 665 666 /* Skip rows */ 667 if (skip) { 668 JDIMENSION tmp; 669 670 /* Check for valid skip_end. We cannot check this value until after 671 * jpeg_start_decompress() is called. Note that we have already verified 672 * that skip_start <= skip_end. 673 */ 674 if (skip_end > cinfo.output_height - 1) { 675 fprintf(stderr, "%s: skip region exceeds image height %d\n", progname, 676 cinfo.output_height); 677 exit(EXIT_FAILURE); 678 } 679 680 /* Write output file header. This is a hack to ensure that the destination 681 * manager creates an output image of the proper size. 682 */ 683 tmp = cinfo.output_height; 684 cinfo.output_height -= (skip_end - skip_start + 1); 685 (*dest_mgr->start_output) (&cinfo, dest_mgr); 686 cinfo.output_height = tmp; 687 688 /* Process data */ 689 while (cinfo.output_scanline < skip_start) { 690 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer, 691 dest_mgr->buffer_height); 692 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines); 693 } 694 jpeg_skip_scanlines(&cinfo, skip_end - skip_start + 1); 695 while (cinfo.output_scanline < cinfo.output_height) { 696 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer, 697 dest_mgr->buffer_height); 698 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines); 699 } 700 701 /* Decompress a subregion */ 702 } else if (crop) { 703 JDIMENSION tmp; 704 705 /* Check for valid crop dimensions. We cannot check these values until 706 * after jpeg_start_decompress() is called. 707 */ 708 if (crop_x + crop_width > cinfo.output_width || 709 crop_y + crop_height > cinfo.output_height) { 710 fprintf(stderr, "%s: crop dimensions exceed image dimensions %d x %d\n", 711 progname, cinfo.output_width, cinfo.output_height); 712 exit(EXIT_FAILURE); 713 } 714 715 jpeg_crop_scanline(&cinfo, &crop_x, &crop_width); 716 if (dest_mgr->calc_buffer_dimensions) 717 (*dest_mgr->calc_buffer_dimensions) (&cinfo, dest_mgr); 718 else 719 ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT); 720 721 /* Write output file header. This is a hack to ensure that the destination 722 * manager creates an output image of the proper size. 723 */ 724 tmp = cinfo.output_height; 725 cinfo.output_height = crop_height; 726 (*dest_mgr->start_output) (&cinfo, dest_mgr); 727 cinfo.output_height = tmp; 728 729 /* Process data */ 730 jpeg_skip_scanlines(&cinfo, crop_y); 731 while (cinfo.output_scanline < crop_y + crop_height) { 732 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer, 733 dest_mgr->buffer_height); 734 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines); 735 } 736 jpeg_skip_scanlines(&cinfo, cinfo.output_height - crop_y - crop_height); 737 738 /* Normal full-image decompress */ 739 } else { 740 /* Write output file header */ 741 (*dest_mgr->start_output) (&cinfo, dest_mgr); 742 743 /* Process data */ 744 while (cinfo.output_scanline < cinfo.output_height) { 745 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer, 746 dest_mgr->buffer_height); 747 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines); 748 } 749 } 750 751 #ifdef PROGRESS_REPORT 752 /* Hack: count final pass as done in case finish_output does an extra pass. 753 * The library won't have updated completed_passes. 754 */ 755 progress.pub.completed_passes = progress.pub.total_passes; 756 #endif 757 758 /* Finish decompression and release memory. 759 * I must do it in this order because output module has allocated memory 760 * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory. 761 */ 762 (*dest_mgr->finish_output) (&cinfo, dest_mgr); 763 (void) jpeg_finish_decompress(&cinfo); 764 jpeg_destroy_decompress(&cinfo); 765 766 /* Close files, if we opened them */ 767 if (input_file != stdin) 768 fclose(input_file); 769 if (output_file != stdout) 770 fclose(output_file); 771 772 #ifdef PROGRESS_REPORT 773 end_progress_monitor((j_common_ptr) &cinfo); 774 #endif 775 776 if (memsrc && inbuffer != NULL) 777 free(inbuffer); 778 779 /* All done. */ 780 exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS); 781 return 0; /* suppress no-return-value warnings */ 782 } 783
