/*  FileToNumbers.c  (c) Kari Laitinen

    http://www.naturalprogramming.com/

    2013-11-28  File created.
    2013-11-28  Last modification.

*/

#include  <stdio.h>

int main( int   number_of_command_line_arguments,
          char* command_line_arguments[] )
{
   if ( number_of_command_line_arguments  !=  2 )
   {
      printf( "\n You have to command this program as: \n"
              "\n  FileToNumbers file.ext \n" ) ;
   }
   else
   {
      FILE  *file_to_read ;

      file_to_read  =  fopen( command_line_arguments[ 1 ], "rb" ) ;

      if  ( file_to_read  ==  0  )
      {
         printf( "\n Cannot open %s", command_line_arguments[ 1 ] ) ;
      }
      else
      {
         while ( ! feof( file_to_read ) )
         {
            char  bytes_from_file[ 16 ] ;
            char  byte_from_file ;

            int byte_counter = 0 ;

            // We'll use the fread() function so that it reads
            // one byte at a time from the file.

            while ( byte_counter < 16 &&
                    fread( &byte_from_file, 1, 1, file_to_read ) > 0 )
            {
               bytes_from_file[ byte_counter ] = byte_from_file ;
               byte_counter ++ ;
            }

            int number_of_bytes_read = byte_counter ;

            char line_of_bytes[ 80 ]  ;
            char bytes_as_characters[ 80 ] ;

            strcpy( line_of_bytes, "" ) ;
            strcpy( bytes_as_characters, "" ) ;

            int byte_index ;

            for ( byte_index  =  0 ;
                  byte_index  <  number_of_bytes_read ;
                  byte_index  ++ )
            {
               char byte_as_string[ 8 ] ;

               sprintf( byte_as_string, " %02X",
                        (unsigned char) bytes_from_file[ byte_index ] ) ;

               strcat( line_of_bytes, byte_as_string ) ;

               if ( bytes_from_file[ byte_index ]  >=  ' ' )
               {
                  bytes_as_characters[ byte_index ] =
                                                 bytes_from_file[ byte_index ] ;
               }
               else
               {
                  bytes_as_characters[ byte_index ] = ' ' ;
               }

               bytes_as_characters[ byte_index + 1 ] = 0 ; // terminate the string
            }

            printf( "\n%-48s  %s", line_of_bytes, bytes_as_characters ) ;
         }

         fclose( file_to_read ) ;

         printf( "\n" ) ;
      }
   }
}