telnetoutputstream.java

来自「j2me学习 简单例子」· Java 代码 · 共 80 行

/* License
 * 
 * Copyright 1994-2004 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  
 *  * Redistribution of source code must retain the above copyright notice,
 *	this list of conditions and the following disclaimer.
 * 
 *  * Redistribution in binary form must reproduce the above copyright notice,
 *	this list of conditions and the following disclaimer in the
 *	documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *  
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
 * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *  
 * You acknowledge that this software is not designed, licensed or intended
 * for use in the design, construction, operation or maintenance of any
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 */
package example.term.telnetui;

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

/**
* A companion to the TelnetInputStream that escapes
* any 255 byte values with an additional 255 (IAC).
*/
public class TelnetOutputStream extends OutputStream
{
    private OutputStream output;
    private final static byte[] ESCAPED = { (byte) 255, (byte) 255 };
    
    /**
    * Constructor specifying the output stream to filter.
    */
    public TelnetOutputStream( OutputStream inOutput )
    {
        output = inOutput;
    }
    
    public void write( int b ) throws IOException
    {
        if ( b == 255 )
        {
            output.write( ESCAPED );
        }
        else
        {
            output.write( b );
        }
    }
    
    public void flush() throws IOException
    {
        output.flush();
    }
    
    public void close() throws IOException
    {
        output.close();
    }

}