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/*

 * 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 		/* to declare isprint() */

#ifdef USE_CCOMMAND		/* command-line reader for Macintosh */

#ifdef __MWERKS__

#include               /* Metrowerks needs this */

#include 		/* ... and this */

#endif

#ifdef THINK_C

#include 		/* 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 */

}