text: /*
   * jpegtran.c
   *
   * Copyright (C) 1995-2001, 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 JPEG transcoding.
   * It is very similar to cjpeg.c, but provides lossless transcoding between
   * different JPEG file formats.  It also provides some lossless and sort-of-
   * lossless transformations of JPEG data.
   */
  
  #include "cdjpeg.h"		/* Common decls for cjpeg/djpeg applications */
  #include "transupp.h"		/* Support routines for jpegtran */
  #include "jversion.h"		/* for version message */
  
  #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
  
  
  /*
   * 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 */
  static JCOPY_OPTION copyoption;	/* -copy switch */
  static jpeg_transform_info transformoption; /* image transformation options */
  
  
  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, "  -copy none     Copy no extra markers from source file\n");
    fprintf(stderr, "  -copy comments Copy only comment markers (default)\n");
    fprintf(stderr, "  -copy all      Copy all extra markers\n");
  #ifdef ENTROPY_OPT_SUPPORTED
    fprintf(stderr, "  -optimize      Optimize Huffman table (smaller file, but slow compression)\n");
  #endif
  #ifdef C_PROGRESSIVE_SUPPORTED
    fprintf(stderr, "  -progressive   Create progressive JPEG file\n");
  #endif
  #if TRANSFORMS_SUPPORTED
    fprintf(stderr, "Switches for modifying the image:\n");
    fprintf(stderr, "  -crop WxH+X+Y  Crop to a rectangular subarea\n");
    fprintf(stderr, "  -grayscale     Reduce to grayscale (omit color data)\n");
    fprintf(stderr, "  -flip [horizontal|vertical]  Mirror image (left-right or top-bottom)\n");
    fprintf(stderr, "  -perfect       Fail if there is non-transformable edge blocks\n");
    fprintf(stderr, "  -rotate [90|180|270]         Rotate image (degrees clockwise)\n");
    fprintf(stderr, "  -transpose     Transpose image\n");
    fprintf(stderr, "  -transverse    Transverse transpose image\n");
    fprintf(stderr, "  -trim          Drop non-transformable edge blocks\n");
  #endif /* TRANSFORMS_SUPPORTED */
    fprintf(stderr, "Switches for advanced users:\n");
    fprintf(stderr, "  -restart N     Set restart interval in rows, or in blocks with B\n");
    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");
    fprintf(stderr, "Switches for wizards:\n");
  #ifdef C_ARITH_CODING_SUPPORTED
    fprintf(stderr, "  -arithmetic    Use arithmetic coding\n");
  #endif
  #ifdef C_MULTISCAN_FILES_SUPPORTED
    fprintf(stderr, "  -scans file    Create multi-scan JPEG per script file\n");
  #endif
    exit(EXIT_FAILURE);
  }
  
  
  LOCAL(void)
  select_transform (JXFORM_CODE transform)
  /* Silly little routine to detect multiple transform options,
   * which we can't handle.
   */
  {
  #if TRANSFORMS_SUPPORTED
    if (transformoption.transform == JXFORM_NONE ||
        transformoption.transform == transform) {
      transformoption.transform = transform;
    } else {
      fprintf(stderr, "%s: can only do one image transformation at a time\n",
  	    progname);
      usage();
    }
  #else
    fprintf(stderr, "%s: sorry, image transformation was not compiled\n",
  	  progname);
    exit(EXIT_FAILURE);
  #endif
  }
  
  
  LOCAL(int)
  parse_switches (j_compress_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;
    boolean simple_progressive;
    char * scansarg = NULL;	/* saves -scans parm if any */
  
    /* Set up default JPEG parameters. */
    simple_progressive = FALSE;
    outfilename = NULL;
    copyoption = JCOPYOPT_DEFAULT;
    transformoption.transform = JXFORM_NONE;
    transformoption.trim = FALSE;
    transformoption.perfect = FALSE;
    transformoption.force_grayscale = FALSE;
    transformoption.crop = FALSE;
    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, "arithmetic", 1)) {
        /* Use arithmetic coding. */
  #ifdef C_ARITH_CODING_SUPPORTED
        cinfo->arith_code = TRUE;
  #else
        fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",
  	      progname);
        exit(EXIT_FAILURE);
  #endif
  
      } else if (keymatch(arg, "copy", 2)) {
        /* Select which extra markers to copy. */
        if (++argn >= argc)	/* advance to next argument */
  	usage();
        if (keymatch(argv[argn], "none", 1)) {
  	copyoption = JCOPYOPT_NONE;
        } else if (keymatch(argv[argn], "comments", 1)) {
  	copyoption = JCOPYOPT_COMMENTS;
        } else if (keymatch(argv[argn], "all", 1)) {
  	copyoption = JCOPYOPT_ALL;
        } else
  	usage();
  
      } else if (keymatch(arg, "crop", 2)) {
        /* Perform lossless cropping. */
  #if TRANSFORMS_SUPPORTED
        if (++argn >= argc)	/* advance to next argument */
  	usage();
        if (! jtransform_parse_crop_spec(&transformoption, argv[argn])) {
  	fprintf(stderr, "%s: bogus -crop argument '%s'\n",
  		progname, argv[argn]);
  	exit(EXIT_FAILURE);
        }
  #else
        select_transform(JXFORM_NONE);	/* force an error */
  #endif
  
      } 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 JPEGTRAN, version %s\n%s\n",
  		JVERSION, JCOPYRIGHT);
  	printed_version = TRUE;
        }
        cinfo->err->trace_level++;
  
      } else if (keymatch(arg, "flip", 1)) {
        /* Mirror left-right or top-bottom. */
        if (++argn >= argc)	/* advance to next argument */
  	usage();
        if (keymatch(argv[argn], "horizontal", 1))
  	select_transform(JXFORM_FLIP_H);
        else if (keymatch(argv[argn], "vertical", 1))
  	select_transform(JXFORM_FLIP_V);
        else
  	usage();
  
      } else if (keymatch(arg, "grayscale", 1) || keymatch(arg, "greyscale",1)) {
        /* Force to grayscale. */
  #if TRANSFORMS_SUPPORTED
        transformoption.force_grayscale = TRUE;
  #else
        select_transform(JXFORM_NONE);	/* force an error */
  #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, "optimize", 1) || keymatch(arg, "optimise", 1)) {
        /* Enable entropy parm optimization. */
  #ifdef ENTROPY_OPT_SUPPORTED
        cinfo->optimize_coding = TRUE;
  #else
        fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n",
  	      progname);
        exit(EXIT_FAILURE);
  #endif
  
      } 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, "perfect", 2)) {
        /* Fail if there is any partial edge MCUs that the transform can't
         * handle. */
        transformoption.perfect = TRUE;
  
      } else if (keymatch(arg, "progressive", 2)) {
        /* Select simple progressive mode. */
  #ifdef C_PROGRESSIVE_SUPPORTED
        simple_progressive = TRUE;
        /* We must postpone execution until num_components is known. */
  #else
        fprintf(stderr, "%s: sorry, progressive output was not compiled\n",
  	      progname);
        exit(EXIT_FAILURE);
  #endif
  
      } else if (keymatch(arg, "restart", 1)) {
        /* Restart interval in MCU rows (or in MCUs with 'b'). */
        long lval;
        char ch = 'x';
  
        if (++argn >= argc)	/* advance to next argument */
  	usage();
        if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
  	usage();
        if (lval < 0 || lval > 65535L)
  	usage();
        if (ch == 'b' || ch == 'B') {
  	cinfo->restart_interval = (unsigned int) lval;
  	cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */
        } else {
  	cinfo->restart_in_rows = (int) lval;
  	/* restart_interval will be computed during startup */
        }
  
      } else if (keymatch(arg, "rotate", 2)) {
        /* Rotate 90, 180, or 270 degrees (measured clockwise). */
        if (++argn >= argc)	/* advance to next argument */
  	usage();
        if (keymatch(argv[argn], "90", 2))
  	select_transform(JXFORM_ROT_90);
        else if (keymatch(argv[argn], "180", 3))
  	select_transform(JXFORM_ROT_180);
        else if (keymatch(argv[argn], "270", 3))
  	select_transform(JXFORM_ROT_270);
        else
  	usage();
  
      } else if (keymatch(arg, "scans", 1)) {
        /* Set scan script. */
  #ifdef C_MULTISCAN_FILES_SUPPORTED
        if (++argn >= argc)	/* advance to next argument */
  	usage();
        scansarg = argv[argn];
        /* We must postpone reading the file in case -progressive appears. */
  #else
        fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n",
  	      progname);
        exit(EXIT_FAILURE);
  #endif
  
      } else if (keymatch(arg, "transpose", 1)) {
        /* Transpose (across UL-to-LR axis). */
        select_transform(JXFORM_TRANSPOSE);
  
      } else if (keymatch(arg, "transverse", 6)) {
        /* Transverse transpose (across UR-to-LL axis). */
        select_transform(JXFORM_TRANSVERSE);
  
      } else if (keymatch(arg, "trim", 3)) {
        /* Trim off any partial edge MCUs that the transform can't handle. */
        transformoption.trim = TRUE;
  
      } else {
        usage();			/* bogus switch */
      }
    }
  
    /* Post-switch-scanning cleanup */
  
    if (for_real) {
  
  #ifdef C_PROGRESSIVE_SUPPORTED
      if (simple_progressive)	/* process -progressive; -scans can override */
        jpeg_simple_progression(cinfo);
  #endif
  
  #ifdef C_MULTISCAN_FILES_SUPPORTED
      if (scansarg != NULL)	/* process -scans if it was present */
        if (! read_scan_script(cinfo, scansarg))
  	usage();
  #endif
    }
  
    return argn;			/* return index of next arg (file name) */
  }
  
  
  /*
   * The main program.
   */
  
  int
  main (int argc, char **argv)
  {
    struct jpeg_decompress_struct srcinfo;
    struct jpeg_compress_struct dstinfo;
    struct jpeg_error_mgr jsrcerr, jdsterr;
  #ifdef PROGRESS_REPORT
    struct cdjpeg_progress_mgr progress;
  #endif
    jvirt_barray_ptr * src_coef_arrays;
    jvirt_barray_ptr * dst_coef_arrays;
    int file_index;
    /* We assume all-in-memory processing and can therefore use only a
     * single file pointer for sequential input and output operation. 
     */
    FILE * fp;
  
    /* On Mac, fetch a command line. */
  #ifdef USE_CCOMMAND
    argc = ccommand(&argv);
  #endif
  
    progname = argv[0];
    if (progname == NULL || progname[0] == 0)
      progname = "jpegtran";	/* in case C library doesn't provide it */
  
    /* Initialize the JPEG decompression object with default error handling. */
    srcinfo.err = jpeg_std_error(&jsrcerr);
    jpeg_create_decompress(&srcinfo);
    /* Initialize the JPEG compression object with default error handling. */
    dstinfo.err = jpeg_std_error(&jdsterr);
    jpeg_create_compress(&dstinfo);
  
    /* Now safe to enable signal catcher.
     * Note: we assume only the decompression object will have virtual arrays.
     */
  #ifdef NEED_SIGNAL_CATCHER
    enable_signal_catcher((j_common_ptr) &srcinfo);
  #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 mostly ignored; we will rescan the switches after
     * opening the input file.  Also note that most of the switches affect the
     * destination JPEG object, so we parse into that and then copy over what
     * needs to affects the source too.
     */
  
    file_index = parse_switches(&dstinfo, argc, argv, 0, FALSE);
    jsrcerr.trace_level = jdsterr.trace_level;
    srcinfo.mem->max_memory_to_use = dstinfo.mem->max_memory_to_use;
  
  #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 ((fp = fopen(argv[file_index], READ_BINARY)) == NULL) {
        fprintf(stderr, "%s: can't open %s for reading\n", progname, argv[file_index]);
        exit(EXIT_FAILURE);
      }
    } else {
      /* default input file is stdin */
      fp = read_stdin();
    }
  
  #ifdef PROGRESS_REPORT
    start_progress_monitor((j_common_ptr) &dstinfo, &progress);
  #endif
  
    /* Specify data source for decompression */
    jpeg_stdio_src(&srcinfo, fp);
  
    /* Enable saving of extra markers that we want to copy */
    jcopy_markers_setup(&srcinfo, copyoption);
  
    /* Read file header */
    (void) jpeg_read_header(&srcinfo, TRUE);
  
    /* Any space needed by a transform option must be requested before
     * jpeg_read_coefficients so that memory allocation will be done right.
     */
  #if TRANSFORMS_SUPPORTED
    /* Fails right away if -perfect is given and transformation is not perfect.
     */
    if (transformoption.perfect &&
        !jtransform_perfect_transform(srcinfo.image_width, srcinfo.image_height,
        srcinfo.max_h_samp_factor * DCTSIZE, srcinfo.max_v_samp_factor * DCTSIZE,
        transformoption.transform)) {
      fprintf(stderr, "%s: transformation is not perfect\n", progname);
      exit(EXIT_FAILURE);
    }
    jtransform_request_workspace(&srcinfo, &transformoption);
  #endif
  
    /* Read source file as DCT coefficients */
    src_coef_arrays = jpeg_read_coefficients(&srcinfo);
  
    /* Initialize destination compression parameters from source values */
    jpeg_copy_critical_parameters(&srcinfo, &dstinfo);
  
    /* Adjust destination parameters if required by transform options;
     * also find out which set of coefficient arrays will hold the output.
     */
  #if TRANSFORMS_SUPPORTED
    dst_coef_arrays = jtransform_adjust_parameters(&srcinfo, &dstinfo,
  						 src_coef_arrays,
  						 &transformoption);
  #else
    dst_coef_arrays = src_coef_arrays;
  #endif
  
    /* Close input file, if we opened it.
     * Note: we assume that jpeg_read_coefficients consumed all input
     * until JPEG_REACHED_EOI, and that jpeg_finish_decompress will
     * only consume more while (! cinfo->inputctl->eoi_reached).
     * We cannot call jpeg_finish_decompress here since we still need the
     * virtual arrays allocated from the source object for processing.
     */
    if (fp != stdin)
      fclose(fp);
  
    /* Open the output file. */
    if (outfilename != NULL) {
      if ((fp = fopen(outfilename, WRITE_BINARY)) == NULL) {
        fprintf(stderr, "%s: can't open %s for writing\n", progname, outfilename);
        exit(EXIT_FAILURE);
      }
    } else {
      /* default output file is stdout */
      fp = write_stdout();
    }
  
    /* Adjust default compression parameters by re-parsing the options */
    file_index = parse_switches(&dstinfo, argc, argv, 0, TRUE);
  
    /* Specify data destination for compression */
    jpeg_stdio_dest(&dstinfo, fp);
  
    /* Start compressor (note no image data is actually written here) */
    jpeg_write_coefficients(&dstinfo, dst_coef_arrays);
  
    /* Copy to the output file any extra markers that we want to preserve */
    jcopy_markers_execute(&srcinfo, &dstinfo, copyoption);
  
    /* Execute image transformation, if any */
  #if TRANSFORMS_SUPPORTED
    jtransform_execute_transformation(&srcinfo, &dstinfo,
  				    src_coef_arrays,
  				    &transformoption);
  #endif
  
    /* Finish compression and release memory */
    jpeg_finish_compress(&dstinfo);
    jpeg_destroy_compress(&dstinfo);
    (void) jpeg_finish_decompress(&srcinfo);
    jpeg_destroy_decompress(&srcinfo);
  
    /* Close output file, if we opened it */
    if (fp != stdout)
      fclose(fp);
  
  #ifdef PROGRESS_REPORT
    end_progress_monitor((j_common_ptr) &dstinfo);
  #endif
  
    /* All done. */
    exit(jsrcerr.num_warnings + jdsterr.num_warnings ?EXIT_WARNING:EXIT_SUCCESS);
    return 0;			/* suppress no-return-value warnings */
  }
  