//Java Source code for Range Coder
//By Sachin Garg, 2006
//
//This range coder is based upon the carry-less range coder 
//implementation by Dmitry Subbotin, and uses 64-bit variables 
//for improved performance.
//
//http://www.sachingarg.com/compression/entropy_coding/java_range_coder

import java.io.IOException;
import java.io.OutputStream;

public final class CompressedOutputStream extends OutputStream {
	
	public CompressedOutputStream(OutputStream out) {
		Encoder=new RangeEncoder64(out);
		Model=new Order0Model();
	}

	public void close() throws IOException {
    	Encoder.EncodeRange(Model.Frequency[Model.NoOfSymbols-1],Model.Frequency[Model.NoOfSymbols],Model.Frequency[Model.NoOfSymbols]);
		Encoder.Flush();
	}

	public void flush() throws IOException {
    	//Encoder.Flush();
    }
	
    public void write(byte[] bs)  throws IOException {
    	write(bs,0,bs.length);
    }

    public void write(byte[] bs, int off, int len)  throws IOException {
    	while (off < len) write(bs[off++]);
    }

    public void write(int i)  throws IOException {
    	Encoder.EncodeRange(Model.Frequency[i],Model.Frequency[i+1],Model.Frequency[Model.Frequency.length-1]);
    	Model.Update(i);
    }

    private Order0Model Model;
	private RangeEncoder64 Encoder;
}