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 * contributors may be used to endorse or promote products derived 
 * from this software without specific prior written permission.
 * 
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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);
    }
}