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package examples.rmisocfac;

import java.io.*;

class XorOutputStream extends FilterOutputStream {

    /*
     * The byte used to "encrypt" each byte of data.
     */
    private final byte pattern;

    /*
     * Constructs an output stream that uses the specified pattern
     * to "encrypt" each byte of data.
     */
    public XorOutputStream(OutputStream out, byte pattern) {
        super(out);
        this.pattern = pattern;
    }

    /*
     * XOR's the byte being written with the pattern
     * and writes the result.
     */
    public void write(int b) throws IOException {
       out.write((b ^ pattern) & 0xFF);
    }
}