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ppmtoascii.c

/*
 * ppmtoascii
 *
 * Copyright (C) 1998 Rasca, Berlin
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <string.h>

/* char map[] =
      "   ,,''`//--))(("
      "__..::;;<<>>ii++"
      "rrccuuoorrzzeebb"
      "qqddffqqqzzuuw$$"
      "mmm***###hhnnn%%"
      "nnmm=====[[[]]{}"
      "VVVVYYXXirrrrrrr"
      "xxxxyyyyggggffff"
      "HHHHHHHHHHHHHHHH"
      "IILLNNPPUUTTRRRR"
      "iirreeaabbtttttt"
      "ddffzzuuwwHHHHHH"
      "GGGGGGhhrrrrssuu"
      "PPOOOQQQEEEEFFFF"
      "***###VVVVYYZZZX"
      "OOOXXXMMMM@@@@@@"
; */

char map[] =
      "       `````````"
      "____----....++++"
      "rrccuuoorrzzeebb"
      "qqddffqqqzzuuw$$"
      "mmmaaaaaahhnnn%%"
      "nnmm=====[[[]]{}"
      "VVVVYYXXirrrrrrr"
      "xxxxyyyyggggffff"
      "HHHHHHHHHHHHHHHH"
      "IILLNNPPUUTTRRRR"
      "iirreeaabbtttttt"
      "ddffzzuuwwHHHHHH"
      "GGGGGGhhrrrrssuu"
      "PPOOOQQQEEEEFFFF"
      "***###VVVVYYZZZX"
      "OOOXXXMMMM@@@@@@"
;

int
main (int argc, char *argv[])
{
#define BUFFSIZE 1024
      int c, i, val;
      FILE *fp;
      char buff[BUFFSIZE];
      int verbose = 0;
      int width = 0, height =0;
      int maxval = 0;
      unsigned char *image;

      while ((c = getopt (argc, argv, "v")) != EOF) {
            switch (c) {
                  case 'v':
                        verbose++;
                        break;
                  default:
                        break;
            }
      }
      if (argc == optind) {
            fp = stdin;
      } else {
            fp = fopen (argv[argc-1], "rb");
            if (!fp)
                  return (1);
      }
      fgets (buff, BUFFSIZE, fp);
      if (strncmp (buff, "P6", 2) != 0) {
            fprintf (stderr, "input is not a raw ppm file\n");
            return (2);
      }
      fgets (buff, BUFFSIZE, fp);
      sscanf (buff, "%d %d", &width, &height);
      fgets (buff, BUFFSIZE, fp);
      sscanf (buff, "%d", &maxval);
      if (width == 0 ||
            height ==0 ||
            maxval ==0) {
            fprintf (stderr, "input is not a raw ppm file\n");
            return (3);
      }
      if (verbose)
            fprintf (stderr, "width=%d height=%d maxval=%d\n", width,height,maxval);
      image = malloc (width * height);
      if (!image) {
            perror (argv[0]);
            return (4);
      }
      for (i = 0; i < width * height; i++) {
            fread (buff, 1, 3, fp);
            val = buff[0] + buff[1] + buff[2];
            image[i] = ~((unsigned char )(val / 3));
      }
      for (i = 0; i < height; i++) {
            int w;
            for (w = 0; w < width; w++) {
                  printf ("%c", (unsigned char) map[(unsigned char )(image[(i*width)+w])]);
            }
            printf ("\n");
      }
      return (0);
}


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