Added code for converting to/from Base64.

package edu.bu.ec504.hw1p3;

import java.io.File;

import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Paths;

import java.util.Base64;

/* Based on:

https://www.baeldung.com/java-base64-image-string

https://mkyong.com/java/how-to-convert-file-into-an-array-of-bytes/

see also

https://www.browserling.com/tools/file-to-base64

 */

public class ConvertToBase64 {

    final private static String inputFileName ="compressed.txt"; // the name of the file to convert

    final private static String outputFileName = "compressed_renewed.txt"; // the output file name

    static String toBase64(String theInputFile) throws IOException {

        byte[] fileContent = Files.readAllBytes(Paths.get(theInputFile));

        return Base64.getEncoder().encodeToString(fileContent);

    }

    static void fromBase64(String base64Text, String theOutputFile) throws IOException {

        byte[] decodedBytes = Base64.getDecoder().decode(base64Text);

        Files.write(Paths.get(theOutputFile),decodedBytes);

    }

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

        String base64 = toBase64(inputFileName);

        System.out.println("Base64:\n"+base64);

        fromBase64(base64, outputFileName);

        System.out.println("Reconsitituted as "+outputFileName);

    }

}