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/*
* $Id: MessageOutputStream.java,v 1.3 2004/06/08 19:05:28 dog Exp $
* Copyright (C) 2002 The Free Software Foundation
*
* This file is part of GNU inetlib, a library.
*
* GNU inetlib is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GNU inetlib is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* As a special exception, if you link this library with other files to
* produce an executable, this library does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* This exception does not however invalidate any other reasons why the
* executable file might be covered by the GNU General Public License.
*/
package gnu.inet.util;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* An output stream that escapes any dots on a line by themself with
* another dot, for the purposes of sending messages to SMTP and NNTP
* servers.
*
* @author <a href="mailto:dog@gnu.org">Chris Burdess</a>
* @version $Revision: 1.3 $ $Date: 2004/06/08 19:05:28 $
*/
public class MessageOutputStream extends FilterOutputStream
{
/**
* The stream termination octet.
*/
public static final int END = 46;
/**
* The line termination octet.
*/
public static final int LF = 10;
int[] last = { LF, LF }; // the last character written to the stream
/**
* Constructs a message output stream connected to the specified output stream.
* @param out the target output stream
*/
public MessageOutputStream (OutputStream out)
{
super (out);
}
/**
* Character write.
*/
public void write (int c) throws IOException
{
if (last[0] == LF && last[1] == END && c == LF)
{
out.write (END);
}
out.write (c);
last[0] = last[1];
last[1] = c;
}
public void write (byte[] bytes) throws IOException
{
write (bytes, 0, bytes.length);
}
/**
* Block write.
*/
public void write (byte[] bytes, int off, int len) throws IOException
{
for (int i = 0; i < len; i++)
{
int c = (int) bytes[off + i];
if (last[0] == LF && last[1] == END && c == LF)
{
byte[] b2 = new byte[bytes.length + 1];
System.arraycopy (bytes, off, b2, off, i);
b2[off + i] = END;
System.arraycopy (bytes, off + i, b2, off + i + 1, len - i);
bytes = b2;
i++;
len++;
}
last[0] = last[1];
last[1] = c;
}
out.write (bytes, off, len);
}
}
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