Encode.java

//Vincent Tran
//CS 1501
//Will perform Move to Front transform on ASCII characters
//Format: java Encode inputfilename.extension outputfilename.extension
//Tested files: .bin

import java.lang.*;
import java.util.*;
import java.io.*;

public class Encode
{
	public static void main(String [] args) throws IOException
	{
		ArrayList<Character> data = new ArrayList<Character>();
		int[] dict = new int[256];
		for(int i = 0; i < 256; i++)
			dict[i] = i;
				
		String current;
		//Will read each character from the input file and store into an ArrayList
		BufferedReader br = new BufferedReader(new FileReader(args[0]));
		current = br.readLine();
		for(int i=0; i < current.length(); i++)
			data.add(current.charAt(i));
		
		int index=0;
		int charVal;
		String output = "";
		
		//Performs the Move-To-Front transform on the ArrayList
		for(char x : data)
		{
			charVal = (int) x;
			for(int i = 0; i < 256; i++)
			{
				if(dict[i] == charVal)
					index = i;
			}
			
			for(int check = index; check != 0; check--)
				dict[check] = dict[check-1];
				
			dict[0] = charVal;
			output = output + index + " ";
		}
		
		//Writes into a file with the user-defined name and extension
		File file = new File(args[1]);
		Writer fileOut = new BufferedWriter(new FileWriter(file));
		fileOut.write(output);
		fileOut.close();
	}
}