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