cjpeg.c - third_party/libjpeg-turbo - Git at Google

 /*
  * cjpeg.c
  *
  * This file was part of the Independent JPEG Group's software:
  * Copyright (C) 1991-1998, Thomas G. Lane.
  * Modified 2003-2011 by Guido Vollbeding.
  * libjpeg-turbo Modifications:
  * Copyright (C) 2010, 2013, D. R. Commander.
  * For conditions of distribution and use, see the accompanying README file.
  *
  * This file contains a command-line user interface for the JPEG compressor.
  * 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:
  *      cjpeg [options]  inputfile outputfile
  *      cjpeg [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
  *      cjpeg [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 "jconfigint.h"

 #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 routine determines what format the input file is,
  * and selects the appropriate input-reading module.
  *
  * To determine which family of input formats the file belongs to,
  * we may look only at the first byte of the file, since C does not
  * guarantee that more than one character can be pushed back with ungetc.
  * Looking at additional bytes would require one of these approaches:
  *     1) assume we can fseek() the input file (fails for piped input);
  *     2) assume we can push back more than one character (works in
  *        some C implementations, but unportable);
  *     3) provide our own buffering (breaks input readers that want to use
  *        stdio directly, such as the RLE library);
  * or  4) don't put back the data, and modify the input_init methods to assume
  *        they start reading after the start of file (also breaks RLE library).
  * #1 is attractive for MS-DOS but is untenable on Unix.
  *
  * The most portable solution for file types that can't be identified by their
  * first byte is to make the user tell us what they are.  This is also the
  * only approach for "raw" file types that contain only arbitrary values.
  * We presently apply this method for Targa files.  Most of the time Targa
  * files start with 0x00, so we recognize that case.  Potentially, however,
  * a Targa file could start with any byte value (byte 0 is the length of the
  * seldom-used ID field), so we provide a switch to force Targa input mode.
  */

 static boolean is_targa;        /* records user -targa switch */


 LOCAL(cjpeg_source_ptr)
 select_file_type (j_compress_ptr cinfo, FILE * infile)
 {
   int c;

   if (is_targa) {
 #ifdef TARGA_SUPPORTED
     return jinit_read_targa(cinfo);
 #else
     ERREXIT(cinfo, JERR_TGA_NOTCOMP);
 #endif
   }

   if ((c = getc(infile)) == EOF)
     ERREXIT(cinfo, JERR_INPUT_EMPTY);
   if (ungetc(c, infile) == EOF)
     ERREXIT(cinfo, JERR_UNGETC_FAILED);

   switch (c) {
 #ifdef BMP_SUPPORTED
   case 'B':
     return jinit_read_bmp(cinfo);
 #endif
 #ifdef GIF_SUPPORTED
   case 'G':
     return jinit_read_gif(cinfo);
 #endif
 #ifdef PPM_SUPPORTED
   case 'P':
     return jinit_read_ppm(cinfo);
 #endif
 #ifdef RLE_SUPPORTED
   case 'R':
     return jinit_read_rle(cinfo);
 #endif
 #ifdef TARGA_SUPPORTED
   case 0x00:
     return jinit_read_targa(cinfo);
 #endif
   default:
     ERREXIT(cinfo, JERR_UNKNOWN_FORMAT);
     break;
   }

   return NULL;                  /* suppress compiler warnings */
 }


 /*
  * 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 */
 boolean memdst;  /* for -memdst 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, "  -quality N[,...]   Compression quality (0..100; 5-95 is useful range)\n");
   fprintf(stderr, "  -grayscale     Create monochrome JPEG file\n");
   fprintf(stderr, "  -rgb           Create RGB JPEG file\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
 #ifdef TARGA_SUPPORTED
   fprintf(stderr, "  -targa         Input file is Targa format (usually not needed)\n");
 #endif
   fprintf(stderr, "Switches for advanced users:\n");
 #ifdef C_ARITH_CODING_SUPPORTED
   fprintf(stderr, "  -arithmetic    Use arithmetic coding\n");
 #endif
 #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, "  -restart N     Set restart interval in rows, or in blocks with B\n");
 #ifdef INPUT_SMOOTHING_SUPPORTED
   fprintf(stderr, "  -smooth N      Smooth dithered input (N=1..100 is strength)\n");
 #endif
   fprintf(stderr, "  -maxmemory N   Maximum memory to use (in kbytes)\n");
   fprintf(stderr, "  -outfile name  Specify name for output file\n");
 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
   fprintf(stderr, "  -memdst        Compress to memory instead of file (useful for benchmarking)\n");
 #endif
   fprintf(stderr, "  -verbose  or  -debug   Emit debug output\n");
   fprintf(stderr, "Switches for wizards:\n");
   fprintf(stderr, "  -baseline      Force baseline quantization tables\n");
   fprintf(stderr, "  -qtables file  Use quantization tables given in file\n");
   fprintf(stderr, "  -qslots N[,...]    Set component quantization tables\n");
   fprintf(stderr, "  -sample HxV[,...]  Set component sampling factors\n");
 #ifdef C_MULTISCAN_FILES_SUPPORTED
   fprintf(stderr, "  -scans file    Create multi-scan JPEG per script file\n");
 #endif
   exit(EXIT_FAILURE);
 }


 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 force_baseline;
   boolean simple_progressive;
   char * qualityarg = NULL;     /* saves -quality parm if any */
   char * qtablefile = NULL;     /* saves -qtables filename if any */
   char * qslotsarg = NULL;      /* saves -qslots parm if any */
   char * samplearg = NULL;      /* saves -sample parm if any */
   char * scansarg = NULL;       /* saves -scans parm if any */

   /* Set up default JPEG parameters. */

   force_baseline = FALSE;       /* by default, allow 16-bit quantizers */
   simple_progressive = FALSE;
   is_targa = FALSE;
   outfilename = NULL;
   memdst = 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, "baseline", 1)) {
       /* Force baseline-compatible output (8-bit quantizer values). */
       force_baseline = TRUE;

     } else if (keymatch(arg, "dct", 2)) {
       /* Select DCT 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, "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, "%s version %s (build %s)\n",
                 PACKAGE_NAME, VERSION, BUILD);
         fprintf(stderr, "%s\n\n", JCOPYRIGHT);
         fprintf(stderr, "Emulating The Independent JPEG Group's software, version %s\n\n",
                 JVERSION);
         printed_version = TRUE;
       }
       cinfo->err->trace_level++;

     } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
       /* Force a monochrome JPEG file to be generated. */
       jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);

     } else if (keymatch(arg, "rgb", 3)) {
       /* Force an RGB JPEG file to be generated. */
       jpeg_set_colorspace(cinfo, JCS_RGB);

     } 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 in\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, "progressive", 1)) {
       /* 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 in\n",
               progname);
       exit(EXIT_FAILURE);
 #endif

     } else if (keymatch(arg, "memdst", 2)) {
       /* Use in-memory destination manager */
 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
       memdst = TRUE;
 #else
       fprintf(stderr, "%s: sorry, in-memory destination manager was not compiled in\n",
               progname);
       exit(EXIT_FAILURE);
 #endif

     } else if (keymatch(arg, "quality", 1)) {
       /* Quality ratings (quantization table scaling factors). */
       if (++argn >= argc)       /* advance to next argument */
         usage();
       qualityarg = argv[argn];

     } else if (keymatch(arg, "qslots", 2)) {
       /* Quantization table slot numbers. */
       if (++argn >= argc)       /* advance to next argument */
         usage();
       qslotsarg = argv[argn];
       /* Must delay setting qslots until after we have processed any
        * colorspace-determining switches, since jpeg_set_colorspace sets
        * default quant table numbers.
        */

     } else if (keymatch(arg, "qtables", 2)) {
       /* Quantization tables fetched from file. */
       if (++argn >= argc)       /* advance to next argument */
         usage();
       qtablefile = argv[argn];
       /* We postpone actually reading the file in case -quality comes later. */

     } 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, "sample", 2)) {
       /* Set sampling factors. */
       if (++argn >= argc)       /* advance to next argument */
         usage();
       samplearg = argv[argn];
       /* Must delay setting sample factors until after we have processed any
        * colorspace-determining switches, since jpeg_set_colorspace sets
        * default sampling factors.
        */

     } else if (keymatch(arg, "scans", 4)) {
       /* 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 in\n",
               progname);
       exit(EXIT_FAILURE);
 #endif

     } else if (keymatch(arg, "smooth", 2)) {
       /* Set input smoothing factor. */
       int val;

       if (++argn >= argc)       /* advance to next argument */
         usage();
       if (sscanf(argv[argn], "%d", &val) != 1)
         usage();
       if (val < 0 || val > 100)
         usage();
       cinfo->smoothing_factor = val;

     } else if (keymatch(arg, "targa", 1)) {
       /* Input file is Targa format. */
       is_targa = TRUE;

     } else {
       usage();                  /* bogus switch */
     }
   }

   /* Post-switch-scanning cleanup */

   if (for_real) {

     /* Set quantization tables for selected quality. */
     /* Some or all may be overridden if -qtables is present. */
     if (qualityarg != NULL)     /* process -quality if it was present */
       if (! set_quality_ratings(cinfo, qualityarg, force_baseline))
         usage();

     if (qtablefile != NULL)     /* process -qtables if it was present */
       if (! read_quant_tables(cinfo, qtablefile, force_baseline))
         usage();

     if (qslotsarg != NULL)      /* process -qslots if it was present */
       if (! set_quant_slots(cinfo, qslotsarg))
         usage();

     if (samplearg != NULL)      /* process -sample if it was present */
       if (! set_sample_factors(cinfo, samplearg))
         usage();

 #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_compress_struct cinfo;
   struct jpeg_error_mgr jerr;
 #ifdef PROGRESS_REPORT
   struct cdjpeg_progress_mgr progress;
 #endif
   int file_index;
   cjpeg_source_ptr src_mgr;
   FILE * input_file;
   FILE * output_file = NULL;
   unsigned char *outbuffer = NULL;
   unsigned long outsize = 0;
   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 = "cjpeg";         /* in case C library doesn't provide it */

   /* Initialize the JPEG compression object with default error handling. */
   cinfo.err = jpeg_std_error(&jerr);
   jpeg_create_compress(&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;

   /* Now safe to enable signal catcher. */
 #ifdef NEED_SIGNAL_CATCHER
   enable_signal_catcher((j_common_ptr) &cinfo);
 #endif

   /* Initialize JPEG parameters.
    * Much of this may be overridden later.
    * In particular, we don't yet know the input file's color space,
    * but we need to provide some value for jpeg_set_defaults() to work.
    */

   cinfo.in_color_space = JCS_RGB; /* arbitrary guess */
   jpeg_set_defaults(&cinfo);

   /* 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.
    */

   file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);

 #ifdef TWO_FILE_COMMANDLINE
   if (!memdst) {
     /* 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 if (!memdst) {
     /* default output file is stdout */
     output_file = write_stdout();
   }

 #ifdef PROGRESS_REPORT
   start_progress_monitor((j_common_ptr) &cinfo, &progress);
 #endif

   /* Figure out the input file format, and set up to read it. */
   src_mgr = select_file_type(&cinfo, input_file);
   src_mgr->input_file = input_file;

   /* Read the input file header to obtain file size & colorspace. */
   (*src_mgr->start_input) (&cinfo, src_mgr);

   /* Now that we know input colorspace, fix colorspace-dependent defaults */
   jpeg_default_colorspace(&cinfo);

   /* Adjust default compression parameters by re-parsing the options */
   file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);

   /* Specify data destination for compression */
 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
   if (memdst)
     jpeg_mem_dest(&cinfo, &outbuffer, &outsize);
   else
 #endif
     jpeg_stdio_dest(&cinfo, output_file);

   /* Start compressor */
   jpeg_start_compress(&cinfo, TRUE);

   /* Process data */
   while (cinfo.next_scanline < cinfo.image_height) {
     num_scanlines = (*src_mgr->get_pixel_rows) (&cinfo, src_mgr);
     (void) jpeg_write_scanlines(&cinfo, src_mgr->buffer, num_scanlines);
   }

   /* Finish compression and release memory */
   (*src_mgr->finish_input) (&cinfo, src_mgr);
   jpeg_finish_compress(&cinfo);
   jpeg_destroy_compress(&cinfo);

   /* Close files, if we opened them */
   if (input_file != stdin)
     fclose(input_file);
   if (output_file != stdout && output_file != NULL)
     fclose(output_file);

 #ifdef PROGRESS_REPORT
   end_progress_monitor((j_common_ptr) &cinfo);
 #endif

   if (memdst) {
     fprintf(stderr, "Compressed size:  %lu bytes\n", outsize);
     if (outbuffer != NULL)
       free(outbuffer);
   }

   /* All done. */
   exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
   return 0;                     /* suppress no-return-value warnings */
 }
	/*
	* cjpeg.c
	*
	* This file was part of the Independent JPEG Group's software:
	* Copyright (C) 1991-1998, Thomas G. Lane.
	* Modified 2003-2011 by Guido Vollbeding.
	* libjpeg-turbo Modifications:
	* Copyright (C) 2010, 2013, D. R. Commander.
	* For conditions of distribution and use, see the accompanying README file.
	*
	* This file contains a command-line user interface for the JPEG compressor.
	* 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:
	* cjpeg [options] inputfile outputfile
	* cjpeg [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
	* cjpeg [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 "jconfigint.h"

	#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 routine determines what format the input file is,
	* and selects the appropriate input-reading module.
	*
	* To determine which family of input formats the file belongs to,
	* we may look only at the first byte of the file, since C does not
	* guarantee that more than one character can be pushed back with ungetc.
	* Looking at additional bytes would require one of these approaches:
	* 1) assume we can fseek() the input file (fails for piped input);
	* 2) assume we can push back more than one character (works in
	* some C implementations, but unportable);
	* 3) provide our own buffering (breaks input readers that want to use
	* stdio directly, such as the RLE library);
	* or 4) don't put back the data, and modify the input_init methods to assume
	* they start reading after the start of file (also breaks RLE library).
	* #1 is attractive for MS-DOS but is untenable on Unix.
	*
	* The most portable solution for file types that can't be identified by their
	* first byte is to make the user tell us what they are. This is also the
	* only approach for "raw" file types that contain only arbitrary values.
	* We presently apply this method for Targa files. Most of the time Targa
	* files start with 0x00, so we recognize that case. Potentially, however,
	* a Targa file could start with any byte value (byte 0 is the length of the
	* seldom-used ID field), so we provide a switch to force Targa input mode.
	*/

	static boolean is_targa; /* records user -targa switch */


	LOCAL(cjpeg_source_ptr)
	select_file_type (j_compress_ptr cinfo, FILE * infile)
	{
	int c;

	if (is_targa) {
	#ifdef TARGA_SUPPORTED
	return jinit_read_targa(cinfo);
	#else
	ERREXIT(cinfo, JERR_TGA_NOTCOMP);
	#endif
	}

	if ((c = getc(infile)) == EOF)
	ERREXIT(cinfo, JERR_INPUT_EMPTY);
	if (ungetc(c, infile) == EOF)
	ERREXIT(cinfo, JERR_UNGETC_FAILED);

	switch (c) {
	#ifdef BMP_SUPPORTED
	case 'B':
	return jinit_read_bmp(cinfo);
	#endif
	#ifdef GIF_SUPPORTED
	case 'G':
	return jinit_read_gif(cinfo);
	#endif
	#ifdef PPM_SUPPORTED
	case 'P':
	return jinit_read_ppm(cinfo);
	#endif
	#ifdef RLE_SUPPORTED
	case 'R':
	return jinit_read_rle(cinfo);
	#endif
	#ifdef TARGA_SUPPORTED
	case 0x00:
	return jinit_read_targa(cinfo);
	#endif
	default:
	ERREXIT(cinfo, JERR_UNKNOWN_FORMAT);
	break;
	}

	return NULL; /* suppress compiler warnings */
	}


	/*
	* 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 */
	boolean memdst; /* for -memdst 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, " -quality N[,...] Compression quality (0..100; 5-95 is useful range)\n");
	fprintf(stderr, " -grayscale Create monochrome JPEG file\n");
	fprintf(stderr, " -rgb Create RGB JPEG file\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
	#ifdef TARGA_SUPPORTED
	fprintf(stderr, " -targa Input file is Targa format (usually not needed)\n");
	#endif
	fprintf(stderr, "Switches for advanced users:\n");
	#ifdef C_ARITH_CODING_SUPPORTED
	fprintf(stderr, " -arithmetic Use arithmetic coding\n");
	#endif
	#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, " -restart N Set restart interval in rows, or in blocks with B\n");
	#ifdef INPUT_SMOOTHING_SUPPORTED
	fprintf(stderr, " -smooth N Smooth dithered input (N=1..100 is strength)\n");
	#endif
	fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n");
	fprintf(stderr, " -outfile name Specify name for output file\n");
	#if JPEG_LIB_VERSION >= 80 \|\| defined(MEM_SRCDST_SUPPORTED)
	fprintf(stderr, " -memdst Compress to memory instead of file (useful for benchmarking)\n");
	#endif
	fprintf(stderr, " -verbose or -debug Emit debug output\n");
	fprintf(stderr, "Switches for wizards:\n");
	fprintf(stderr, " -baseline Force baseline quantization tables\n");
	fprintf(stderr, " -qtables file Use quantization tables given in file\n");
	fprintf(stderr, " -qslots N[,...] Set component quantization tables\n");
	fprintf(stderr, " -sample HxV[,...] Set component sampling factors\n");
	#ifdef C_MULTISCAN_FILES_SUPPORTED
	fprintf(stderr, " -scans file Create multi-scan JPEG per script file\n");
	#endif
	exit(EXIT_FAILURE);
	}


	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 force_baseline;
	boolean simple_progressive;
	char * qualityarg = NULL; /* saves -quality parm if any */
	char * qtablefile = NULL; /* saves -qtables filename if any */
	char * qslotsarg = NULL; /* saves -qslots parm if any */
	char * samplearg = NULL; /* saves -sample parm if any */
	char * scansarg = NULL; /* saves -scans parm if any */

	/* Set up default JPEG parameters. */

	force_baseline = FALSE; /* by default, allow 16-bit quantizers */
	simple_progressive = FALSE;
	is_targa = FALSE;
	outfilename = NULL;
	memdst = 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, "baseline", 1)) {
	/* Force baseline-compatible output (8-bit quantizer values). */
	force_baseline = TRUE;

	} else if (keymatch(arg, "dct", 2)) {
	/* Select DCT 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, "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, "%s version %s (build %s)\n",
	PACKAGE_NAME, VERSION, BUILD);
	fprintf(stderr, "%s\n\n", JCOPYRIGHT);
	fprintf(stderr, "Emulating The Independent JPEG Group's software, version %s\n\n",
	JVERSION);
	printed_version = TRUE;
	}
	cinfo->err->trace_level++;

	} else if (keymatch(arg, "grayscale", 2) \|\| keymatch(arg, "greyscale",2)) {
	/* Force a monochrome JPEG file to be generated. */
	jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);

	} else if (keymatch(arg, "rgb", 3)) {
	/* Force an RGB JPEG file to be generated. */
	jpeg_set_colorspace(cinfo, JCS_RGB);

	} 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 in\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, "progressive", 1)) {
	/* 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 in\n",
	progname);
	exit(EXIT_FAILURE);
	#endif

	} else if (keymatch(arg, "memdst", 2)) {
	/* Use in-memory destination manager */
	#if JPEG_LIB_VERSION >= 80 \|\| defined(MEM_SRCDST_SUPPORTED)
	memdst = TRUE;
	#else
	fprintf(stderr, "%s: sorry, in-memory destination manager was not compiled in\n",
	progname);
	exit(EXIT_FAILURE);
	#endif

	} else if (keymatch(arg, "quality", 1)) {
	/* Quality ratings (quantization table scaling factors). */
	if (++argn >= argc) /* advance to next argument */
	usage();
	qualityarg = argv[argn];

	} else if (keymatch(arg, "qslots", 2)) {
	/* Quantization table slot numbers. */
	if (++argn >= argc) /* advance to next argument */
	usage();
	qslotsarg = argv[argn];
	/* Must delay setting qslots until after we have processed any
	* colorspace-determining switches, since jpeg_set_colorspace sets
	* default quant table numbers.
	*/

	} else if (keymatch(arg, "qtables", 2)) {
	/* Quantization tables fetched from file. */
	if (++argn >= argc) /* advance to next argument */
	usage();
	qtablefile = argv[argn];
	/* We postpone actually reading the file in case -quality comes later. */

	} 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, "sample", 2)) {
	/* Set sampling factors. */
	if (++argn >= argc) /* advance to next argument */
	usage();
	samplearg = argv[argn];
	/* Must delay setting sample factors until after we have processed any
	* colorspace-determining switches, since jpeg_set_colorspace sets
	* default sampling factors.
	*/

	} else if (keymatch(arg, "scans", 4)) {
	/* 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 in\n",
	progname);
	exit(EXIT_FAILURE);
	#endif

	} else if (keymatch(arg, "smooth", 2)) {
	/* Set input smoothing factor. */
	int val;

	if (++argn >= argc) /* advance to next argument */
	usage();
	if (sscanf(argv[argn], "%d", &val) != 1)
	usage();
	if (val < 0 \|\| val > 100)
	usage();
	cinfo->smoothing_factor = val;

	} else if (keymatch(arg, "targa", 1)) {
	/* Input file is Targa format. */
	is_targa = TRUE;

	} else {
	usage(); /* bogus switch */
	}
	}

	/* Post-switch-scanning cleanup */

	if (for_real) {

	/* Set quantization tables for selected quality. */
	/* Some or all may be overridden if -qtables is present. */
	if (qualityarg != NULL) /* process -quality if it was present */
	if (! set_quality_ratings(cinfo, qualityarg, force_baseline))
	usage();

	if (qtablefile != NULL) /* process -qtables if it was present */
	if (! read_quant_tables(cinfo, qtablefile, force_baseline))
	usage();

	if (qslotsarg != NULL) /* process -qslots if it was present */
	if (! set_quant_slots(cinfo, qslotsarg))
	usage();

	if (samplearg != NULL) /* process -sample if it was present */
	if (! set_sample_factors(cinfo, samplearg))
	usage();

	#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_compress_struct cinfo;
	struct jpeg_error_mgr jerr;
	#ifdef PROGRESS_REPORT
	struct cdjpeg_progress_mgr progress;
	#endif
	int file_index;
	cjpeg_source_ptr src_mgr;
	FILE * input_file;
	FILE * output_file = NULL;
	unsigned char *outbuffer = NULL;
	unsigned long outsize = 0;
	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 = "cjpeg"; /* in case C library doesn't provide it */

	/* Initialize the JPEG compression object with default error handling. */
	cinfo.err = jpeg_std_error(&jerr);
	jpeg_create_compress(&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;

	/* Now safe to enable signal catcher. */
	#ifdef NEED_SIGNAL_CATCHER
	enable_signal_catcher((j_common_ptr) &cinfo);
	#endif

	/* Initialize JPEG parameters.
	* Much of this may be overridden later.
	* In particular, we don't yet know the input file's color space,
	* but we need to provide some value for jpeg_set_defaults() to work.
	*/

	cinfo.in_color_space = JCS_RGB; /* arbitrary guess */
	jpeg_set_defaults(&cinfo);

	/* 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.
	*/

	file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);

	#ifdef TWO_FILE_COMMANDLINE
	if (!memdst) {
	/* 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 if (!memdst) {
	/* default output file is stdout */
	output_file = write_stdout();
	}

	#ifdef PROGRESS_REPORT
	start_progress_monitor((j_common_ptr) &cinfo, &progress);
	#endif

	/* Figure out the input file format, and set up to read it. */
	src_mgr = select_file_type(&cinfo, input_file);
	src_mgr->input_file = input_file;

	/* Read the input file header to obtain file size & colorspace. */
	(*src_mgr->start_input) (&cinfo, src_mgr);

	/* Now that we know input colorspace, fix colorspace-dependent defaults */
	jpeg_default_colorspace(&cinfo);

	/* Adjust default compression parameters by re-parsing the options */
	file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);

	/* Specify data destination for compression */
	#if JPEG_LIB_VERSION >= 80 \|\| defined(MEM_SRCDST_SUPPORTED)
	if (memdst)
	jpeg_mem_dest(&cinfo, &outbuffer, &outsize);
	else
	#endif
	jpeg_stdio_dest(&cinfo, output_file);

	/* Start compressor */
	jpeg_start_compress(&cinfo, TRUE);

	/* Process data */
	while (cinfo.next_scanline < cinfo.image_height) {
	num_scanlines = (*src_mgr->get_pixel_rows) (&cinfo, src_mgr);
	(void) jpeg_write_scanlines(&cinfo, src_mgr->buffer, num_scanlines);
	}

	/* Finish compression and release memory */
	(*src_mgr->finish_input) (&cinfo, src_mgr);
	jpeg_finish_compress(&cinfo);
	jpeg_destroy_compress(&cinfo);

	/* Close files, if we opened them */
	if (input_file != stdin)
	fclose(input_file);
	if (output_file != stdout && output_file != NULL)
	fclose(output_file);

	#ifdef PROGRESS_REPORT
	end_progress_monitor((j_common_ptr) &cinfo);
	#endif

	if (memdst) {
	fprintf(stderr, "Compressed size: %lu bytes\n", outsize);
	if (outbuffer != NULL)
	free(outbuffer);
	}

	/* All done. */
	exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
	return 0; /* suppress no-return-value warnings */
	}