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import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;

public class Run {
    private static FileWriter fr;
    static String b;
    private static BufferedReader br;

    public static void main(String[] args) throws IOException {

        // encrypted file
        File enc_f = new File("caesar.rtf.enc");
        //decrypted file
        File dec_f = new File("caesar.rtf.dec");

        // init variables
        String text_enc = new String();
        String text_dec = new String();

        // read file
        br = new BufferedReader(new FileReader(enc_f));
        for (String line; (line = br.readLine()) != null; text_enc += line);
        char[] stringToCharArray = text_enc.toCharArray();

        // parse file and convert string to char
        for (int shift = 0; shift < 257; shift++) {

            for (char output : stringToCharArray) {

                // convert ascii to int
                int ascii = (int) output;

                // shift
                ascii = ascii + shift;
                ascii = ascii % 256;

                // convert back to ascii
                char chTemp = (char) ascii;
                text_dec += chTemp;

            }

            // visual representation
            text_dec += System.lineSeparator();
            text_dec += System.lineSeparator();
            text_dec += shift;
            text_dec += System.lineSeparator();
            System.out.println(shift);

            // write decrypted file
            fr = new FileWriter(dec_f);
            fr.write(text_dec);

        }
        fr.close();
    }
}

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