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 * libjpeg-turbo Modifications: 7 * Copyright (C) 2010-2011, 2013-2016, D. R. Commander. 8 * Copyright (C) 2015, Google, Inc. 9 * For conditions of distribution and use, see the accompanying README file. 10 * 11 * This file contains a command-line user interface for the JPEG decompressor. 12 * It should work on any system with Unix- or MS-DOS-style command lines. 13 * 14 * Two different command line styles are permitted, depending on the 15 * compile-time switch TWO_FILE_COMMANDLINE: 16 * djpeg [options] inputfile outputfile 17 * djpeg [options] [inputfile] 18 * In the second style, output is always to standard output, which you'd 19 * normally redirect to a file or pipe to some other program. Input is 20 * either from a named file or from standard input (typically redirected). 21 * The second style is convenient on Unix but is unhelpful on systems that 22 * don't support pipes. Also, you MUST use the first style if your system 23 * doesn't do binary I/O to stdin/stdout. 24 * To simplify script writing, the "-outfile" switch is provided. The syntax 25 * djpeg [options] -outfile outputfile inputfile 26 * works regardless of which command line style is used. 27 */ 28 29 #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ 30 #include "jversion.h" /* for version message */ 31 #include "jconfigint.h" 32 #include "wrppm.h" 33 34 #include <ctype.h> /* to declare isprint() */ 35 36 #ifdef USE_CCOMMAND /* command-line reader for Macintosh */ 37 #ifdef __MWERKS__ 38 #include <SIOUX.h> /* Metrowerks needs this */ 39 #include <console.h> /* ... and this */ 40 #endif 41 #ifdef THINK_C 42 #include <console.h> /* Think declares it here */ 43 #endif 44 #endif 45 46 47 /* Create the add-on message string table. */ 48 49 #define JMESSAGE(code,string) string , 50 51 static const char * const cdjpeg_message_table[] = { 52 #include "cderror.h" 53 NULL 54 }; 55 56 57 /* 58 * This list defines the known output image formats 59 * (not all of which need be supported by a given version). 60 * You can change the default output format by defining DEFAULT_FMT; 61 * indeed, you had better do so if you undefine PPM_SUPPORTED. 62 */ 63 64 typedef enum { 65 FMT_BMP, /* BMP format (Windows flavor) */ 66 FMT_GIF, /* GIF format */ 67 FMT_OS2, /* BMP format (OS/2 flavor) */ 68 FMT_PPM, /* PPM/PGM (PBMPLUS formats) */ 69 FMT_RLE, /* RLE format */ 70 FMT_TARGA, /* Targa format */ 71 FMT_TIFF /* TIFF format */ 72 } IMAGE_FORMATS; 73 74 #ifndef DEFAULT_FMT /* so can override from CFLAGS in Makefile */ 75 #define DEFAULT_FMT FMT_PPM 76 #endif 77 78 static IMAGE_FORMATS requested_fmt; 79 80 81 /* 82 * Argument-parsing code. 83 * The switch parser is designed to be useful with DOS-style command line 84 * syntax, ie, intermixed switches and file names, where only the switches 85 * to the left of a given file name affect processing of that file. 86 * The main program in this file doesn't actually use this capability... 87 */ 88 89 90 static const char *progname; /* program name for error messages */ 91 static char *outfilename; /* for -outfile switch */ 92 boolean memsrc; /* for -memsrc switch */ 93 boolean skip, crop; 94 JDIMENSION skip_start, skip_end; 95 JDIMENSION crop_x, crop_y, crop_width, crop_height; 96 #define INPUT_BUF_SIZE 4096 97 98 99 LOCAL(void) 100 usage (void) 101 /* complain about bad command line */ 102 { 103 fprintf(stderr, "usage: %s [switches] ", progname); 104 #ifdef TWO_FILE_COMMANDLINE 105 fprintf(stderr, "inputfile outputfile\n"); 106 #else 107 fprintf(stderr, "[inputfile]\n"); 108 #endif 109 110 fprintf(stderr, "Switches (names may be abbreviated):\n"); 111 fprintf(stderr, " -colors N Reduce image to no more than N colors\n"); 112 fprintf(stderr, " -fast Fast, low-quality processing\n"); 113 fprintf(stderr, " -grayscale Force grayscale output\n"); 114 fprintf(stderr, " -rgb Force RGB output\n"); 115 fprintf(stderr, " -rgb565 Force RGB565 output\n"); 116 #ifdef IDCT_SCALING_SUPPORTED 117 fprintf(stderr, " -scale M/N Scale output image by fraction M/N, eg, 1/8\n"); 118 #endif 119 #ifdef BMP_SUPPORTED 120 fprintf(stderr, " -bmp Select BMP output format (Windows style)%s\n", 121 (DEFAULT_FMT == FMT_BMP ? " (default)" : "")); 122 #endif 123 #ifdef GIF_SUPPORTED 124 fprintf(stderr, " -gif Select GIF output format%s\n", 125 (DEFAULT_FMT == FMT_GIF ? " (default)" : "")); 126 #endif 127 #ifdef BMP_SUPPORTED 128 fprintf(stderr, " -os2 Select BMP output format (OS/2 style)%s\n", 129 (DEFAULT_FMT == FMT_OS2 ? " (default)" : "")); 130 #endif 131 #ifdef PPM_SUPPORTED 132 fprintf(stderr, " -pnm Select PBMPLUS (PPM/PGM) output format%s\n", 133 (DEFAULT_FMT == FMT_PPM ? " (default)" : "")); 134 #endif 135 #ifdef RLE_SUPPORTED 136 fprintf(stderr, " -rle Select Utah RLE output format%s\n", 137 (DEFAULT_FMT == FMT_RLE ? " (default)" : "")); 138 #endif 139 #ifdef TARGA_SUPPORTED 140 fprintf(stderr, " -targa Select Targa output format%s\n", 141 (DEFAULT_FMT == FMT_TARGA ? " (default)" : "")); 142 #endif 143 fprintf(stderr, "Switches for advanced users:\n"); 144 #ifdef DCT_ISLOW_SUPPORTED 145 fprintf(stderr, " -dct int Use integer DCT method%s\n", 146 (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : "")); 147 #endif 148 #ifdef DCT_IFAST_SUPPORTED 149 fprintf(stderr, " -dct fast Use fast integer DCT (less accurate)%s\n", 150 (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : "")); 151 #endif 152 #ifdef DCT_FLOAT_SUPPORTED 153 fprintf(stderr, " -dct float Use floating-point DCT method%s\n", 154 (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : "")); 155 #endif 156 fprintf(stderr, " -dither fs Use F-S dithering (default)\n"); 157 fprintf(stderr, " -dither none Don't use dithering in quantization\n"); 158 fprintf(stderr, " -dither ordered Use ordered dither (medium speed, quality)\n"); 159 #ifdef QUANT_2PASS_SUPPORTED 160 fprintf(stderr, " -map FILE Map to colors used in named image file\n"); 161 #endif 162 fprintf(stderr, " -nosmooth Don't use high-quality upsampling\n"); 163 #ifdef QUANT_1PASS_SUPPORTED 164 fprintf(stderr, " -onepass Use 1-pass quantization (fast, low quality)\n"); 165 #endif 166 fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n"); 167 fprintf(stderr, " -outfile name Specify name for output file\n"); 168 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED) 169 fprintf(stderr, " -memsrc Load input file into memory before decompressing\n"); 170 #endif 171 172 fprintf(stderr, " -skip Y0,Y1 Decompress all rows except those between Y0 and Y1 (inclusive)\n"); 173 fprintf(stderr, " -crop WxH+X+Y Decompress only a rectangular subregion of the image\n"); 174 fprintf(stderr, " -verbose or -debug Emit debug output\n"); 175 fprintf(stderr, " -version Print version information and exit\n"); 176 exit(EXIT_FAILURE); 177 } 178 179 180 LOCAL(int) 181 parse_switches (j_decompress_ptr cinfo, int argc, char **argv, 182 int last_file_arg_seen, boolean for_real) 183 /* Parse optional switches. 184 * Returns argv[] index of first file-name argument (== argc if none). 185 * Any file names with indexes <= last_file_arg_seen are ignored; 186 * they have presumably been processed in a previous iteration. 187 * (Pass 0 for last_file_arg_seen on the first or only iteration.) 188 * for_real is FALSE on the first (dummy) pass; we may skip any expensive 189 * processing. 190 */ 191 { 192 int argn; 193 char * arg; 194 195 /* Set up default JPEG parameters. */ 196 requested_fmt = DEFAULT_FMT; /* set default output file format */ 197 outfilename = NULL; 198 memsrc = FALSE; 199 skip = FALSE; 200 crop = FALSE; 201 cinfo->err->trace_level = 0; 202 203 /* Scan command line options, adjust parameters */ 204 205 for (argn = 1; argn < argc; argn++) { 206 arg = argv[argn]; 207 if (*arg != '-') { 208 /* Not a switch, must be a file name argument */ 209 if (argn <= last_file_arg_seen) { 210 outfilename = NULL; /* -outfile applies to just one input file */ 211 continue; /* ignore this name if previously processed */ 212 } 213 break; /* else done parsing switches */ 214 } 215 arg++; /* advance past switch marker character */ 216 217 if (keymatch(arg, "bmp", 1)) { 218 /* BMP output format. */ 219 requested_fmt = FMT_BMP; 220 221 } else if (keymatch(arg, "colors", 1) || keymatch(arg, "colours", 1) || 222 keymatch(arg, "quantize", 1) || keymatch(arg, "quantise", 1)) { 223 /* Do color quantization. */ 224 int val; 225 226 if (++argn >= argc) /* advance to next argument */ 227 usage(); 228 if (sscanf(argv[argn], "%d", &val) != 1) 229 usage(); 230 cinfo->desired_number_of_colors = val; 231 cinfo->quantize_colors = TRUE; 232 233 } else if (keymatch(arg, "dct", 2)) { 234 /* Select IDCT algorithm. */ 235 if (++argn >= argc) /* advance to next argument */ 236 usage(); 237 if (keymatch(argv[argn], "int", 1)) { 238 cinfo->dct_method = JDCT_ISLOW; 239 } else if (keymatch(argv[argn], "fast", 2)) { 240 cinfo->dct_method = JDCT_IFAST; 241 } else if (keymatch(argv[argn], "float", 2)) { 242 cinfo->dct_method = JDCT_FLOAT; 243 } else 244 usage(); 245 246 } else if (keymatch(arg, "dither", 2)) { 247 /* Select dithering algorithm. */ 248 if (++argn >= argc) /* advance to next argument */ 249 usage(); 250 if (keymatch(argv[argn], "fs", 2)) { 251 cinfo->dither_mode = JDITHER_FS; 252 } else if (keymatch(argv[argn], "none", 2)) { 253 cinfo->dither_mode = JDITHER_NONE; 254 } else if (keymatch(argv[argn], "ordered", 2)) { 255 cinfo->dither_mode = JDITHER_ORDERED; 256 } else 257 usage(); 258 259 } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) { 260 /* Enable debug printouts. */ 261 /* On first -d, print version identification */ 262 static boolean printed_version = FALSE; 263 264 if (! printed_version) { 265 fprintf(stderr, "%s version %s (build %s)\n", 266 PACKAGE_NAME, VERSION, BUILD); 267 fprintf(stderr, "%s\n\n", JCOPYRIGHT); 268 fprintf(stderr, "Emulating The Independent JPEG Group's software, version %s\n\n", 269 JVERSION); 270 printed_version = TRUE; 271 } 272 cinfo->err->trace_level++; 273 274 } else if (keymatch(arg, "version", 4)) { 275 fprintf(stderr, "%s version %s (build %s)\n", 276 PACKAGE_NAME, VERSION, BUILD); 277 exit(EXIT_SUCCESS); 278 279 } else if (keymatch(arg, "fast", 1)) { 280 /* Select recommended processing options for quick-and-dirty output. */ 281 cinfo->two_pass_quantize = FALSE; 282 cinfo->dither_mode = JDITHER_ORDERED; 283 if (! cinfo->quantize_colors) /* don't override an earlier -colors */ 284 cinfo->desired_number_of_colors = 216; 285 cinfo->dct_method = JDCT_FASTEST; 286 cinfo->do_fancy_upsampling = FALSE; 287 288 } else if (keymatch(arg, "gif", 1)) { 289 /* GIF output format. */ 290 requested_fmt = FMT_GIF; 291 292 } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) { 293 /* Force monochrome output. */ 294 cinfo->out_color_space = JCS_GRAYSCALE; 295 296 } else if (keymatch(arg, "rgb", 2)) { 297 /* Force RGB output. */ 298 cinfo->out_color_space = JCS_RGB; 299 300 } else if (keymatch(arg, "rgb565", 2)) { 301 /* Force RGB565 output. */ 302 cinfo->out_color_space = JCS_RGB565; 303 304 } else if (keymatch(arg, "map", 3)) { 305 /* Quantize to a color map taken from an input file. */ 306 if (++argn >= argc) /* advance to next argument */ 307 usage(); 308 if (for_real) { /* too expensive to do twice! */ 309 #ifdef QUANT_2PASS_SUPPORTED /* otherwise can't quantize to supplied map */ 310 FILE * mapfile; 311 312 if ((mapfile = fopen(argv[argn], READ_BINARY)) == NULL) { 313 fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]); 314 exit(EXIT_FAILURE); 315 } 316 read_color_map(cinfo, mapfile); 317 fclose(mapfile); 318 cinfo->quantize_colors = TRUE; 319 #else 320 ERREXIT(cinfo, JERR_NOT_COMPILED); 321 #endif 322 } 323 324 } else if (keymatch(arg, "maxmemory", 3)) { 325 /* Maximum memory in Kb (or Mb with 'm'). */ 326 long lval; 327 char ch = 'x'; 328 329 if (++argn >= argc) /* advance to next argument */ 330 usage(); 331 if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1) 332 usage(); 333 if (ch == 'm' || ch == 'M') 334 lval *= 1000L; 335 cinfo->mem->max_memory_to_use = lval * 1000L; 336 337 } else if (keymatch(arg, "nosmooth", 3)) { 338 /* Suppress fancy upsampling */ 339 cinfo->do_fancy_upsampling = FALSE; 340 341 } else if (keymatch(arg, "onepass", 3)) { 342 /* Use fast one-pass quantization. */ 343 cinfo->two_pass_quantize = FALSE; 344 345 } else if (keymatch(arg, "os2", 3)) { 346 /* BMP output format (OS/2 flavor). */ 347 requested_fmt = FMT_OS2; 348 349 } else if (keymatch(arg, "outfile", 4)) { 350 /* Set output file name. */ 351 if (++argn >= argc) /* advance to next argument */ 352 usage(); 353 outfilename = argv[argn]; /* save it away for later use */ 354 355 } else if (keymatch(arg, "memsrc", 2)) { 356 /* Use in-memory source manager */ 357 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED) 358 memsrc = TRUE; 359 #else 360 fprintf(stderr, "%s: sorry, in-memory source manager was not compiled in\n", 361 progname); 362 exit(EXIT_FAILURE); 363 #endif 364 365 } else if (keymatch(arg, "pnm", 1) || keymatch(arg, "ppm", 1)) { 366 /* PPM/PGM output format. */ 367 requested_fmt = FMT_PPM; 368 369 } else if (keymatch(arg, "rle", 1)) { 370 /* RLE output format. */ 371 requested_fmt = FMT_RLE; 372 373 } else if (keymatch(arg, "scale", 2)) { 374 /* Scale the output image by a fraction M/N. */ 375 if (++argn >= argc) /* advance to next argument */ 376 usage(); 377 if (sscanf(argv[argn], "%d/%d", 378 &cinfo->scale_num, &cinfo->scale_denom) != 2) 379 usage(); 380 381 } else if (keymatch(arg, "skip", 2)) { 382 if (++argn >= argc) 383 usage(); 384 if (sscanf(argv[argn], "%u,%u", &skip_start, &skip_end) != 2 || 385 skip_start > skip_end) 386 usage(); 387 skip = TRUE; 388 389 } else if (keymatch(arg, "crop", 2)) { 390 char c; 391 if (++argn >= argc) 392 usage(); 393 if (sscanf(argv[argn], "%u%c%u+%u+%u", &crop_width, &c, &crop_height, 394 &crop_x, &crop_y) != 5 || 395 (c != 'X' && c != 'x') || crop_width < 1 || crop_height < 1) 396 usage(); 397 crop = TRUE; 398 399 } else if (keymatch(arg, "targa", 1)) { 400 /* Targa output format. */ 401 requested_fmt = FMT_TARGA; 402 403 } else { 404 usage(); /* bogus switch */ 405 } 406 } 407 408 return argn; /* return index of next arg (file name) */ 409 } 410 411 412 /* 413 * Marker processor for COM and interesting APPn markers. 414 * This replaces the library's built-in processor, which just skips the marker. 415 * We want to print out the marker as text, to the extent possible. 416 * Note this code relies on a non-suspending data source. 417 */ 418 419 LOCAL(unsigned int) 420 jpeg_getc (j_decompress_ptr cinfo) 421 /* Read next byte */ 422 { 423 struct jpeg_source_mgr * datasrc = cinfo->src; 424 425 if (datasrc->bytes_in_buffer == 0) { 426 if (! (*datasrc->fill_input_buffer) (cinfo)) 427 ERREXIT(cinfo, JERR_CANT_SUSPEND); 428 } 429 datasrc->bytes_in_buffer--; 430 return GETJOCTET(*datasrc->next_input_byte++); 431 } 432 433 434 METHODDEF(boolean) 435 print_text_marker (j_decompress_ptr cinfo) 436 { 437 boolean traceit = (cinfo->err->trace_level >= 1); 438 INT32 length; 439 unsigned int ch; 440 unsigned int lastch = 0; 441 442 length = jpeg_getc(cinfo) << 8; 443 length += jpeg_getc(cinfo); 444 length -= 2; /* discount the length word itself */ 445 446 if (traceit) { 447 if (cinfo->unread_marker == JPEG_COM) 448 fprintf(stderr, "Comment, length %ld:\n", (long) length); 449 else /* assume it is an APPn otherwise */ 450 fprintf(stderr, "APP%d, length %ld:\n", 451 cinfo->unread_marker - JPEG_APP0, (long) length); 452 } 453 454 while (--length >= 0) { 455 ch = jpeg_getc(cinfo); 456 if (traceit) { 457 /* Emit the character in a readable form. 458 * Nonprintables are converted to \nnn form, 459 * while \ is converted to \\. 460 * Newlines in CR, CR/LF, or LF form will be printed as one newline. 461 */ 462 if (ch == '\r') { 463 fprintf(stderr, "\n"); 464 } else if (ch == '\n') { 465 if (lastch != '\r') 466 fprintf(stderr, "\n"); 467 } else if (ch == '\\') { 468 fprintf(stderr, "\\\\"); 469 } else if (isprint(ch)) { 470 putc(ch, stderr); 471 } else { 472 fprintf(stderr, "\\%03o", ch); 473 } 474 lastch = ch; 475 } 476 } 477 478 if (traceit) 479 fprintf(stderr, "\n"); 480 481 return TRUE; 482 } 483 484 485 /* 486 * The main program. 487 */ 488 489 int 490 main (int argc, char **argv) 491 { 492 struct jpeg_decompress_struct cinfo; 493 struct jpeg_error_mgr jerr; 494 #ifdef PROGRESS_REPORT 495 struct cdjpeg_progress_mgr progress; 496 #endif 497 int file_index; 498 djpeg_dest_ptr dest_mgr = NULL; 499 FILE * input_file; 500 FILE * output_file; 501 unsigned char *inbuffer = NULL; 502 unsigned long insize = 0; 503 JDIMENSION num_scanlines; 504 505 /* On Mac, fetch a command line. */ 506 #ifdef USE_CCOMMAND 507 argc = ccommand(&argv); 508 #endif 509 510 progname = argv[0]; 511 if (progname == NULL || progname[0] == 0) 512 progname = "djpeg"; /* in case C library doesn't provide it */ 513 514 /* Initialize the JPEG decompression object with default error handling. */ 515 cinfo.err = jpeg_std_error(&jerr); 516 jpeg_create_decompress(&cinfo); 517 /* Add some application-specific error messages (from cderror.h) */ 518 jerr.addon_message_table = cdjpeg_message_table; 519 jerr.first_addon_message = JMSG_FIRSTADDONCODE; 520 jerr.last_addon_message = JMSG_LASTADDONCODE; 521 522 /* Insert custom marker processor for COM and APP12. 523 * APP12 is used by some digital camera makers for textual info, 524 * so we provide the ability to display it as text. 525 * If you like, additional APPn marker types can be selected for display, 526 * but don't try to override APP0 or APP14 this way (see libjpeg.txt). 527 */ 528 jpeg_set_marker_processor(&cinfo, JPEG_COM, print_text_marker); 529 jpeg_set_marker_processor(&cinfo, JPEG_APP0+12, print_text_marker); 530 531 /* Scan command line to find file names. */ 532 /* It is convenient to use just one switch-parsing routine, but the switch 533 * values read here are ignored; we will rescan the switches after opening 534 * the input file. 535 * (Exception: tracing level set here controls verbosity for COM markers 536 * found during jpeg_read_header...) 537 */ 538 539 file_index = parse_switches(&cinfo, argc, argv, 0, FALSE); 540 541 #ifdef TWO_FILE_COMMANDLINE 542 /* Must have either -outfile switch or explicit output file name */ 543 if (outfilename == NULL) { 544 if (file_index != argc-2) { 545 fprintf(stderr, "%s: must name one input and one output file\n", 546 progname); 547 usage(); 548 } 549 outfilename = argv[file_index+1]; 550 } else { 551 if (file_index != argc-1) { 552 fprintf(stderr, "%s: must name one input and one output file\n", 553 progname); 554 usage(); 555 } 556 } 557 #else 558 /* Unix style: expect zero or one file name */ 559 if (file_index < argc-1) { 560 fprintf(stderr, "%s: only one input file\n", progname); 561 usage(); 562 } 563 #endif /* TWO_FILE_COMMANDLINE */ 564 565 /* Open the input file. */ 566 if (file_index < argc) { 567 if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) { 568 fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]); 569 exit(EXIT_FAILURE); 570 } 571 } else { 572 /* default input file is stdin */ 573 input_file = read_stdin(); 574 } 575 576 /* Open the output file. */ 577 if (outfilename != NULL) { 578 if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) { 579 fprintf(stderr, "%s: can't open %s\n", progname, outfilename); 580 exit(EXIT_FAILURE); 581 } 582 } else { 583 /* default output file is stdout */ 584 output_file = write_stdout(); 585 } 586 587 #ifdef PROGRESS_REPORT 588 start_progress_monitor((j_common_ptr) &cinfo, &progress); 589 #endif 590 591 /* Specify data source for decompression */ 592 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED) 593 if (memsrc) { 594 size_t nbytes; 595 do { 596 inbuffer = (unsigned char *)realloc(inbuffer, insize + INPUT_BUF_SIZE); 597 if (inbuffer == NULL) { 598 fprintf(stderr, "%s: memory allocation failure\n", progname); 599 exit(EXIT_FAILURE); 600 } 601 nbytes = JFREAD(input_file, &inbuffer[insize], INPUT_BUF_SIZE); 602 if (nbytes < INPUT_BUF_SIZE && ferror(input_file)) { 603 if (file_index < argc) 604 fprintf(stderr, "%s: can't read from %s\n", progname, 605 argv[file_index]); 606 else 607 fprintf(stderr, "%s: can't read from stdin\n", progname); 608 } 609 insize += (unsigned long)nbytes; 610 } while (nbytes == INPUT_BUF_SIZE); 611 fprintf(stderr, "Compressed size: %lu bytes\n", insize); 612 jpeg_mem_src(&cinfo, inbuffer, insize); 613 } else 614 #endif 615 jpeg_stdio_src(&cinfo, input_file); 616 617 /* Read file header, set default decompression parameters */ 618 (void) jpeg_read_header(&cinfo, TRUE); 619 620 /* Adjust default decompression parameters by re-parsing the options */ 621 file_index = parse_switches(&cinfo, argc, argv, 0, TRUE); 622 623 /* Initialize the output module now to let it override any crucial 624 * option settings (for instance, GIF wants to force color quantization). 625 */ 626 switch (requested_fmt) { 627 #ifdef BMP_SUPPORTED 628 case FMT_BMP: 629 dest_mgr = jinit_write_bmp(&cinfo, FALSE); 630 break; 631 case FMT_OS2: 632 dest_mgr = jinit_write_bmp(&cinfo, TRUE); 633 break; 634 #endif 635 #ifdef GIF_SUPPORTED 636 case FMT_GIF: 637 dest_mgr = jinit_write_gif(&cinfo); 638 break; 639 #endif 640 #ifdef PPM_SUPPORTED 641 case FMT_PPM: 642 dest_mgr = jinit_write_ppm(&cinfo); 643 break; 644 #endif 645 #ifdef RLE_SUPPORTED 646 case FMT_RLE: 647 dest_mgr = jinit_write_rle(&cinfo); 648 break; 649 #endif 650 #ifdef TARGA_SUPPORTED 651 case FMT_TARGA: 652 dest_mgr = jinit_write_targa(&cinfo); 653 break; 654 #endif 655 default: 656 ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT); 657 break; 658 } 659 dest_mgr->output_file = output_file; 660 661 /* Start decompressor */ 662 (void) jpeg_start_decompress(&cinfo); 663 664 /* Skip rows */ 665 if (skip) { 666 JDIMENSION tmp; 667 668 /* Check for valid skip_end. We cannot check this value until after 669 * jpeg_start_decompress() is called. Note that we have already verified 670 * that skip_start <= skip_end. 671 */ 672 if (skip_end > cinfo.output_height - 1) { 673 fprintf(stderr, "%s: skip region exceeds image height %d\n", progname, 674 cinfo.output_height); 675 exit(EXIT_FAILURE); 676 } 677 678 /* Write output file header. This is a hack to ensure that the destination 679 * manager creates an output image of the proper size. 680 */ 681 tmp = cinfo.output_height; 682 cinfo.output_height -= (skip_end - skip_start + 1); 683 (*dest_mgr->start_output) (&cinfo, dest_mgr); 684 cinfo.output_height = tmp; 685 686 /* Process data */ 687 while (cinfo.output_scanline < skip_start) { 688 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer, 689 dest_mgr->buffer_height); 690 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines); 691 } 692 jpeg_skip_scanlines(&cinfo, skip_end - skip_start + 1); 693 while (cinfo.output_scanline < cinfo.output_height) { 694 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer, 695 dest_mgr->buffer_height); 696 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines); 697 } 698 699 /* Decompress a subregion */ 700 } else if (crop) { 701 JDIMENSION tmp; 702 703 /* Check for valid crop dimensions. We cannot check these values until 704 * after jpeg_start_decompress() is called. 705 */ 706 if (crop_x + crop_width > cinfo.output_width || 707 crop_y + crop_height > cinfo.output_height) { 708 fprintf(stderr, "%s: crop dimensions exceed image dimensions %d x %d\n", 709 progname, cinfo.output_width, cinfo.output_height); 710 exit(EXIT_FAILURE); 711 } 712 713 jpeg_crop_scanline(&cinfo, &crop_x, &crop_width); 714 ((ppm_dest_ptr) dest_mgr)->buffer_width = cinfo.output_width * 715 cinfo.out_color_components * 716 sizeof(JSAMPLE); 717 718 /* Write output file header. This is a hack to ensure that the destination 719 * manager creates an output image of the proper size. 720 */ 721 tmp = cinfo.output_height; 722 cinfo.output_height = crop_height; 723 (*dest_mgr->start_output) (&cinfo, dest_mgr); 724 cinfo.output_height = tmp; 725 726 /* Process data */ 727 jpeg_skip_scanlines(&cinfo, crop_y); 728 while (cinfo.output_scanline < crop_y + crop_height) { 729 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer, 730 dest_mgr->buffer_height); 731 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines); 732 } 733 jpeg_skip_scanlines(&cinfo, cinfo.output_height - crop_y - crop_height); 734 735 /* Normal full-image decompress */ 736 } else { 737 /* Write output file header */ 738 (*dest_mgr->start_output) (&cinfo, dest_mgr); 739 740 /* Process data */ 741 while (cinfo.output_scanline < cinfo.output_height) { 742 num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer, 743 dest_mgr->buffer_height); 744 (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines); 745 } 746 } 747 748 #ifdef PROGRESS_REPORT 749 /* Hack: count final pass as done in case finish_output does an extra pass. 750 * The library won't have updated completed_passes. 751 */ 752 progress.pub.completed_passes = progress.pub.total_passes; 753 #endif 754 755 /* Finish decompression and release memory. 756 * I must do it in this order because output module has allocated memory 757 * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory. 758 */ 759 (*dest_mgr->finish_output) (&cinfo, dest_mgr); 760 (void) jpeg_finish_decompress(&cinfo); 761 jpeg_destroy_decompress(&cinfo); 762 763 /* Close files, if we opened them */ 764 if (input_file != stdin) 765 fclose(input_file); 766 if (output_file != stdout) 767 fclose(output_file); 768 769 #ifdef PROGRESS_REPORT 770 end_progress_monitor((j_common_ptr) &cinfo); 771 #endif 772 773 if (memsrc && inbuffer != NULL) 774 free(inbuffer); 775 776 /* All done. */ 777 exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS); 778 return 0; /* suppress no-return-value warnings */ 779 } 780
