#include <fcntl.h>
#include <unistd.h>
#include <iostream>

/*
   many other files with this format can be downloaded from
     http://rabbit.eng.miami.edu/geographical/bintiles/
   the names all look a bit like this example
     usaW105N35D10.dat
   the "W105N35" indicates that the top left corner corresponds
     to the point with longitude 105 degrees West and latitude
     35 degrees North.
   the "D10" means it covers an area 10 degrees square, so the
     bottom right corner is at 95 West and 25 South

   If you are working on rabbit, you do not need to download
   any files, you can access them directly using the file name
   "/home/www/geographical/bintiles/usaW85N30D5.dat" (which
   contains most of florida)

   Beware! Many of the files have a 600x600 arrangement, not
   the 800x800 of the class example one. If you don't correctly
   adjust the program, the image will be completely wrong.
*/

void main()
{ int f = open("mystery.dat", O_RDONLY | O_BINARY);
  if (f<0)
  { cout << "no\n";
    exit(1); }
  short int data[800];
  for (int line=0; true; line+=1)
  { int n = read(f, data, 1600);
    if (n<0)
      break;
    if (line%10 != 0)
      continue;
    for (int i=0; i<800; i+=10)
    { bool solid = false;
      for (int j=0; j<10; j+=1)
        if (data[i+j]==-500)
          solid=true;
      if (solid)
        cout << "#";
      else
        cout << "."; }
    cout << "\n"; }
  close(f); }