text: /*
   * djpeg.c
   *
   * Copyright (C) 1991-1997, Thomas G. Lane.
   * This file is part of the Independent JPEG Group's software.
   * For conditions of distribution and use, see the accompanying README file.
   *
   * This file contains a command-line user interface for the JPEG decompressor.
   * It should work on any system with Unix- or MS-DOS-style command lines.
   *
   * Two different command line styles are permitted, depending on the
   * compile-time switch TWO_FILE_COMMANDLINE:
   *	djpeg [options]  inputfile outputfile
   *	djpeg [options]  [inputfile]
   * In the second style, output is always to standard output, which you'd
   * normally redirect to a file or pipe to some other program.  Input is
   * either from a named file or from standard input (typically redirected).
   * The second style is convenient on Unix but is unhelpful on systems that
   * don't support pipes.  Also, you MUST use the first style if your system
   * doesn't do binary I/O to stdin/stdout.
   * To simplify script writing, the "-outfile" switch is provided.  The syntax
   *	djpeg [options]  -outfile outputfile  inputfile
   * works regardless of which command line style is used.
   */
  
  #include "cdjpeg.h"		/* Common decls for cjpeg/djpeg applications */
  #include "jversion.h"		/* for version message */
  
  #include <ctype.h>		/* to declare isprint() */
  
  #ifdef USE_CCOMMAND		/* command-line reader for Macintosh */
  #ifdef __MWERKS__
  #include <sioux.h>              /* Metrowerks needs this */
  #include <console.h>		/* ... and this */
  #endif
  #ifdef THINK_C
  #include <console.h>		/* Think declares it here */
  #endif
  #endif
  
  
  /* Create the add-on message string table. */
  
  #define JMESSAGE(code,string)	string ,
  
  static const char * const cdjpeg_message_table[] = {
  #include "cderror.h"
    NULL
  };
  
  
  /*
   * This list defines the known output image formats
   * (not all of which need be supported by a given version).
   * You can change the default output format by defining DEFAULT_FMT;
   * indeed, you had better do so if you undefine PPM_SUPPORTED.
   */
  
  typedef enum {
  	FMT_BMP,		/* BMP format (Windows flavor) */
  	FMT_GIF,		/* GIF format */
  	FMT_OS2,		/* BMP format (OS/2 flavor) */
  	FMT_PPM,		/* PPM/PGM (PBMPLUS formats) */
  	FMT_RLE,		/* RLE format */
  	FMT_TARGA,		/* Targa format */
  	FMT_TIFF		/* TIFF format */
  } IMAGE_FORMATS;
  
  #ifndef DEFAULT_FMT		/* so can override from CFLAGS in Makefile */
  #define DEFAULT_FMT	FMT_PPM
  #endif
  
  static IMAGE_FORMATS requested_fmt;
  
  
  /*
   * Argument-parsing code.
   * The switch parser is designed to be useful with DOS-style command line
   * syntax, ie, intermixed switches and file names, where only the switches
   * to the left of a given file name affect processing of that file.
   * The main program in this file doesn't actually use this capability...
   */
  
  
  static const char * progname;	/* program name for error messages */
  static char * outfilename;	/* for -outfile switch */
  
  
  LOCAL(void)
  usage (void)
  /* complain about bad command line */
  {
    fprintf(stderr, "usage: %s [switches] ", progname);
  #ifdef TWO_FILE_COMMANDLINE
    fprintf(stderr, "inputfile outputfile\n");
  #else
    fprintf(stderr, "[inputfile]\n");
  #endif
  
    fprintf(stderr, "Switches (names may be abbreviated):\n");
    fprintf(stderr, "  -colors N      Reduce image to no more than N colors\n");
    fprintf(stderr, "  -fast          Fast, low-quality processing\n");
    fprintf(stderr, "  -grayscale     Force grayscale output\n");
  #ifdef IDCT_SCALING_SUPPORTED
    fprintf(stderr, "  -scale M/N     Scale output image by fraction M/N, eg, 1/8\n");
  #endif
  #ifdef BMP_SUPPORTED
    fprintf(stderr, "  -bmp           Select BMP output format (Windows style)%s\n",
  	  (DEFAULT_FMT == FMT_BMP ? " (default)" : ""));
  #endif
  #ifdef GIF_SUPPORTED
    fprintf(stderr, "  -gif           Select GIF output format%s\n",
  	  (DEFAULT_FMT == FMT_GIF ? " (default)" : ""));
  #endif
  #ifdef BMP_SUPPORTED
    fprintf(stderr, "  -os2           Select BMP output format (OS/2 style)%s\n",
  	  (DEFAULT_FMT == FMT_OS2 ? " (default)" : ""));
  #endif
  #ifdef PPM_SUPPORTED
    fprintf(stderr, "  -pnm           Select PBMPLUS (PPM/PGM) output format%s\n",
  	  (DEFAULT_FMT == FMT_PPM ? " (default)" : ""));
  #endif
  #ifdef RLE_SUPPORTED
    fprintf(stderr, "  -rle           Select Utah RLE output format%s\n",
  	  (DEFAULT_FMT == FMT_RLE ? " (default)" : ""));
  #endif
  #ifdef TARGA_SUPPORTED
    fprintf(stderr, "  -targa         Select Targa output format%s\n",
  	  (DEFAULT_FMT == FMT_TARGA ? " (default)" : ""));
  #endif
    fprintf(stderr, "Switches for advanced users:\n");
  #ifdef DCT_ISLOW_SUPPORTED
    fprintf(stderr, "  -dct int       Use integer DCT method%s\n",
  	  (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
  #endif
  #ifdef DCT_IFAST_SUPPORTED
    fprintf(stderr, "  -dct fast      Use fast integer DCT (less accurate)%s\n",
  	  (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
  #endif
  #ifdef DCT_FLOAT_SUPPORTED
    fprintf(stderr, "  -dct float     Use floating-point DCT method%s\n",
  	  (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
  #endif
    fprintf(stderr, "  -dither fs     Use F-S dithering (default)\n");
    fprintf(stderr, "  -dither none   Don't use dithering in quantization\n");
    fprintf(stderr, "  -dither ordered  Use ordered dither (medium speed, quality)\n");
  #ifdef QUANT_2PASS_SUPPORTED
    fprintf(stderr, "  -map FILE      Map to colors used in named image file\n");
  #endif
    fprintf(stderr, "  -nosmooth      Don't use high-quality upsampling\n");
  #ifdef QUANT_1PASS_SUPPORTED
    fprintf(stderr, "  -onepass       Use 1-pass quantization (fast, low quality)\n");
  #endif
    fprintf(stderr, "  -maxmemory N   Maximum memory to use (in kbytes)\n");
    fprintf(stderr, "  -outfile name  Specify name for output file\n");
    fprintf(stderr, "  -verbose  or  -debug   Emit debug output\n");
    exit(EXIT_FAILURE);
  }
  
  
  LOCAL(int)
  parse_switches (j_decompress_ptr cinfo, int argc, char **argv,
  		int last_file_arg_seen, boolean for_real)
  /* Parse optional switches.
   * Returns argv[] index of first file-name argument (== argc if none).
   * Any file names with indexes <= last_file_arg_seen are ignored;
   * they have presumably been processed in a previous iteration.
   * (Pass 0 for last_file_arg_seen on the first or only iteration.)
   * for_real is FALSE on the first (dummy) pass; we may skip any expensive
   * processing.
   */
  {
    int argn;
    char * arg;
  
    /* Set up default JPEG parameters. */
    requested_fmt = DEFAULT_FMT;	/* set default output file format */
    outfilename = NULL;
    cinfo->err->trace_level = 0;
  
    /* Scan command line options, adjust parameters */
  
    for (argn = 1; argn < argc; argn++) {
      arg = argv[argn];
      if (*arg != '-') {
        /* Not a switch, must be a file name argument */
        if (argn <= last_file_arg_seen) {
  	outfilename = NULL;	/* -outfile applies to just one input file */
  	continue;		/* ignore this name if previously processed */
        }
        break;			/* else done parsing switches */
      }
      arg++;			/* advance past switch marker character */
  
      if (keymatch(arg, "bmp", 1)) {
        /* BMP output format. */
        requested_fmt = FMT_BMP;
  
      } else if (keymatch(arg, "colors", 1) || keymatch(arg, "colours", 1) ||
  	       keymatch(arg, "quantize", 1) || keymatch(arg, "quantise", 1)) {
        /* Do color quantization. */
        int val;
  
        if (++argn >= argc)	/* advance to next argument */
  	usage();
        if (sscanf(argv[argn], "%d", &val) != 1)
  	usage();
        cinfo->desired_number_of_colors = val;
        cinfo->quantize_colors = TRUE;
  
      } else if (keymatch(arg, "dct", 2)) {
        /* Select IDCT algorithm. */
        if (++argn >= argc)	/* advance to next argument */
  	usage();
        if (keymatch(argv[argn], "int", 1)) {
  	cinfo->dct_method = JDCT_ISLOW;
        } else if (keymatch(argv[argn], "fast", 2)) {
  	cinfo->dct_method = JDCT_IFAST;
        } else if (keymatch(argv[argn], "float", 2)) {
  	cinfo->dct_method = JDCT_FLOAT;
        } else
  	usage();
  
      } else if (keymatch(arg, "dither", 2)) {
        /* Select dithering algorithm. */
        if (++argn >= argc)	/* advance to next argument */
  	usage();
        if (keymatch(argv[argn], "fs", 2)) {
  	cinfo->dither_mode = JDITHER_FS;
        } else if (keymatch(argv[argn], "none", 2)) {
  	cinfo->dither_mode = JDITHER_NONE;
        } else if (keymatch(argv[argn], "ordered", 2)) {
  	cinfo->dither_mode = JDITHER_ORDERED;
        } else
  	usage();
  
      } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
        /* Enable debug printouts. */
        /* On first -d, print version identification */
        static boolean printed_version = FALSE;
  
        if (! printed_version) {
  	fprintf(stderr, "Independent JPEG Group's DJPEG, version %s\n%s\n",
  		JVERSION, JCOPYRIGHT);
  	printed_version = TRUE;
        }
        cinfo->err->trace_level++;
  
      } else if (keymatch(arg, "fast", 1)) {
        /* Select recommended processing options for quick-and-dirty output. */
        cinfo->two_pass_quantize = FALSE;
        cinfo->dither_mode = JDITHER_ORDERED;
        if (! cinfo->quantize_colors) /* don't override an earlier -colors */
  	cinfo->desired_number_of_colors = 216;
        cinfo->dct_method = JDCT_FASTEST;
        cinfo->do_fancy_upsampling = FALSE;
  
      } else if (keymatch(arg, "gif", 1)) {
        /* GIF output format. */
        requested_fmt = FMT_GIF;
  
      } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
        /* Force monochrome output. */
        cinfo->out_color_space = JCS_GRAYSCALE;
  
      } else if (keymatch(arg, "map", 3)) {
        /* Quantize to a color map taken from an input file. */
        if (++argn >= argc)	/* advance to next argument */
  	usage();
        if (for_real) {		/* too expensive to do twice! */
  #ifdef QUANT_2PASS_SUPPORTED	/* otherwise can't quantize to supplied map */
  	FILE * mapfile;
  
  	if ((mapfile = fopen(argv[argn], READ_BINARY)) == NULL) {
  	  fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]);
  	  exit(EXIT_FAILURE);
  	}
  	read_color_map(cinfo, mapfile);
  	fclose(mapfile);
  	cinfo->quantize_colors = TRUE;
  #else
  	ERREXIT(cinfo, JERR_NOT_COMPILED);
  #endif
        }
  
      } else if (keymatch(arg, "maxmemory", 3)) {
        /* Maximum memory in Kb (or Mb with 'm'). */
        long lval;
        char ch = 'x';
  
        if (++argn >= argc)	/* advance to next argument */
  	usage();
        if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
  	usage();
        if (ch == 'm' || ch == 'M')
  	lval *= 1000L;
        cinfo->mem->max_memory_to_use = lval * 1000L;
  
      } else if (keymatch(arg, "nosmooth", 3)) {
        /* Suppress fancy upsampling */
        cinfo->do_fancy_upsampling = FALSE;
  
      } else if (keymatch(arg, "onepass", 3)) {
        /* Use fast one-pass quantization. */
        cinfo->two_pass_quantize = FALSE;
  
      } else if (keymatch(arg, "os2", 3)) {
        /* BMP output format (OS/2 flavor). */
        requested_fmt = FMT_OS2;
  
      } else if (keymatch(arg, "outfile", 4)) {
        /* Set output file name. */
        if (++argn >= argc)	/* advance to next argument */
  	usage();
        outfilename = argv[argn];	/* save it away for later use */
  
      } else if (keymatch(arg, "pnm", 1) || keymatch(arg, "ppm", 1)) {
        /* PPM/PGM output format. */
        requested_fmt = FMT_PPM;
  
      } else if (keymatch(arg, "rle", 1)) {
        /* RLE output format. */
        requested_fmt = FMT_RLE;
  
      } else if (keymatch(arg, "scale", 1)) {
        /* Scale the output image by a fraction M/N. */
        if (++argn >= argc)	/* advance to next argument */
  	usage();
        if (sscanf(argv[argn], "%d/%d",
  		 &cinfo->scale_num, &cinfo->scale_denom) != 2)
  	usage();
  
      } else if (keymatch(arg, "targa", 1)) {
        /* Targa output format. */
        requested_fmt = FMT_TARGA;
  
      } else {
        usage();			/* bogus switch */
      }
    }
  
    return argn;			/* return index of next arg (file name) */
  }
  
  
  /*
   * Marker processor for COM and interesting APPn markers.
   * This replaces the library's built-in processor, which just skips the marker.
   * We want to print out the marker as text, to the extent possible.
   * Note this code relies on a non-suspending data source.
   */
  
  LOCAL(unsigned int)
  jpeg_getc (j_decompress_ptr cinfo)
  /* Read next byte */
  {
    struct jpeg_source_mgr * datasrc = cinfo->src;
  
    if (datasrc->bytes_in_buffer == 0) {
      if (! (*datasrc->fill_input_buffer) (cinfo))
        ERREXIT(cinfo, JERR_CANT_SUSPEND);
    }
    datasrc->bytes_in_buffer--;
    return GETJOCTET(*datasrc->next_input_byte++);
  }
  
  
  METHODDEF(boolean)
  print_text_marker (j_decompress_ptr cinfo)
  {
    boolean traceit = (cinfo->err->trace_level >= 1);
    INT32 length;
    unsigned int ch;
    unsigned int lastch = 0;
  
    length = jpeg_getc(cinfo) << 8;
    length += jpeg_getc(cinfo);
    length -= 2;			/* discount the length word itself */
  
    if (traceit) {
      if (cinfo->unread_marker == JPEG_COM)
        fprintf(stderr, "Comment, length %ld:\n", (long) length);
      else			/* assume it is an APPn otherwise */
        fprintf(stderr, "APP%d, length %ld:\n",
  	      cinfo->unread_marker - JPEG_APP0, (long) length);
    }
  
    while (--length >= 0) {
      ch = jpeg_getc(cinfo);
      if (traceit) {
        /* Emit the character in a readable form.
         * Nonprintables are converted to \nnn form,
         * while \ is converted to \\.
         * Newlines in CR, CR/LF, or LF form will be printed as one newline.
         */
        if (ch == '\r') {
  	fprintf(stderr, "\n");
        } else if (ch == '\n') {
  	if (lastch != '\r')
  	  fprintf(stderr, "\n");
        } else if (ch == '\\') {
  	fprintf(stderr, "\\\\");
        } else if (isprint(ch)) {
  	putc(ch, stderr);
        } else {
  	fprintf(stderr, "\\%03o", ch);
        }
        lastch = ch;
      }
    }
  
    if (traceit)
      fprintf(stderr, "\n");
  
    return TRUE;
  }
  
  
  /*
   * The main program.
   */
  
  int
  main (int argc, char **argv)
  {
    struct jpeg_decompress_struct cinfo;
    struct jpeg_error_mgr jerr;
  #ifdef PROGRESS_REPORT
    struct cdjpeg_progress_mgr progress;
  #endif
    int file_index;
    djpeg_dest_ptr dest_mgr = NULL;
    FILE * input_file;
    FILE * output_file;
    JDIMENSION num_scanlines;
  
    /* On Mac, fetch a command line. */
  #ifdef USE_CCOMMAND
    argc = ccommand(&argv);
  #endif
  
    progname = argv[0];
    if (progname == NULL || progname[0] == 0)
      progname = "djpeg";		/* in case C library doesn't provide it */
  
    /* Initialize the JPEG decompression object with default error handling. */
    cinfo.err = jpeg_std_error(&jerr);
    jpeg_create_decompress(&cinfo);
    /* Add some application-specific error messages (from cderror.h) */
    jerr.addon_message_table = cdjpeg_message_table;
    jerr.first_addon_message = JMSG_FIRSTADDONCODE;
    jerr.last_addon_message = JMSG_LASTADDONCODE;
  
    /* Insert custom marker processor for COM and APP12.
     * APP12 is used by some digital camera makers for textual info,
     * so we provide the ability to display it as text.
     * If you like, additional APPn marker types can be selected for display,
     * but don't try to override APP0 or APP14 this way (see libjpeg.doc).
     */
    jpeg_set_marker_processor(&cinfo, JPEG_COM, print_text_marker);
    jpeg_set_marker_processor(&cinfo, JPEG_APP0+12, print_text_marker);
  
    /* Now safe to enable signal catcher. */
  #ifdef NEED_SIGNAL_CATCHER
    enable_signal_catcher((j_common_ptr) &cinfo);
  #endif
  
    /* Scan command line to find file names. */
    /* It is convenient to use just one switch-parsing routine, but the switch
     * values read here are ignored; we will rescan the switches after opening
     * the input file.
     * (Exception: tracing level set here controls verbosity for COM markers
     * found during jpeg_read_header...)
     */
  
    file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
  
  #ifdef TWO_FILE_COMMANDLINE
    /* Must have either -outfile switch or explicit output file name */
    if (outfilename == NULL) {
      if (file_index != argc-2) {
        fprintf(stderr, "%s: must name one input and one output file\n",
  	      progname);
        usage();
      }
      outfilename = argv[file_index+1];
    } else {
      if (file_index != argc-1) {
        fprintf(stderr, "%s: must name one input and one output file\n",
  	      progname);
        usage();
      }
    }
  #else
    /* Unix style: expect zero or one file name */
    if (file_index < argc-1) {
      fprintf(stderr, "%s: only one input file\n", progname);
      usage();
    }
  #endif /* TWO_FILE_COMMANDLINE */
  
    /* Open the input file. */
    if (file_index < argc) {
      if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
        fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
        exit(EXIT_FAILURE);
      }
    } else {
      /* default input file is stdin */
      input_file = read_stdin();
    }
  
    /* Open the output file. */
    if (outfilename != NULL) {
      if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
        fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
        exit(EXIT_FAILURE);
      }
    } else {
      /* default output file is stdout */
      output_file = write_stdout();
    }
  
  #ifdef PROGRESS_REPORT
    start_progress_monitor((j_common_ptr) &cinfo, &progress);
  #endif
  
    /* Specify data source for decompression */
    jpeg_stdio_src(&cinfo, input_file);
  
    /* Read file header, set default decompression parameters */
    (void) jpeg_read_header(&cinfo, TRUE);
  
    /* Adjust default decompression parameters by re-parsing the options */
    file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
  
    /* Initialize the output module now to let it override any crucial
     * option settings (for instance, GIF wants to force color quantization).
     */
    switch (requested_fmt) {
  #ifdef BMP_SUPPORTED
    case FMT_BMP:
      dest_mgr = jinit_write_bmp(&cinfo, FALSE);
      break;
    case FMT_OS2:
      dest_mgr = jinit_write_bmp(&cinfo, TRUE);
      break;
  #endif
  #ifdef GIF_SUPPORTED
    case FMT_GIF:
      dest_mgr = jinit_write_gif(&cinfo);
      break;
  #endif
  #ifdef PPM_SUPPORTED
    case FMT_PPM:
      dest_mgr = jinit_write_ppm(&cinfo);
      break;
  #endif
  #ifdef RLE_SUPPORTED
    case FMT_RLE:
      dest_mgr = jinit_write_rle(&cinfo);
      break;
  #endif
  #ifdef TARGA_SUPPORTED
    case FMT_TARGA:
      dest_mgr = jinit_write_targa(&cinfo);
      break;
  #endif
    default:
      ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT);
      break;
    }
    dest_mgr->output_file = output_file;
  
    /* Start decompressor */
    (void) jpeg_start_decompress(&cinfo);
  
    /* Write output file header */
    (*dest_mgr->start_output) (&cinfo, dest_mgr);
  
    /* Process data */
    while (cinfo.output_scanline < cinfo.output_height) {
      num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
  					dest_mgr->buffer_height);
      (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
    }
  
  #ifdef PROGRESS_REPORT
    /* Hack: count final pass as done in case finish_output does an extra pass.
     * The library won't have updated completed_passes.
     */
    progress.pub.completed_passes = progress.pub.total_passes;
  #endif
  
    /* Finish decompression and release memory.
     * I must do it in this order because output module has allocated memory
     * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory.
     */
    (*dest_mgr->finish_output) (&cinfo, dest_mgr);
    (void) jpeg_finish_decompress(&cinfo);
    jpeg_destroy_decompress(&cinfo);
  
    /* Close files, if we opened them */
    if (input_file != stdin)
      fclose(input_file);
    if (output_file != stdout)
      fclose(output_file);
  
  #ifdef PROGRESS_REPORT
    end_progress_monitor((j_common_ptr) &cinfo);
  #endif
  
    /* All done. */
    exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
    return 0;			/* suppress no-return-value warnings */
  }
  