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/*
* $Id: CRLFOutputStream.java,v 1.5 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;
import java.io.UnsupportedEncodingException;
/**
* An output stream that filters LFs into CR/LF pairs.
*
* @author <a href="mailto:dog@gnu.org">Chris Burdess</a>
* @author $Revision: 1.5 $ $Date: 2004/06/08 19:05:28 $
*/
public class CRLFOutputStream extends FilterOutputStream
{
static final String US_ASCII = "US-ASCII";
/**
* The CR octet.
*/
public static final int CR = 13;
/**
* The LF octet.
*/
public static final int LF = 10;
/**
* The CR/LF pair.
*/
public static final byte[] CRLF = { CR, LF };
/**
* The last byte read.
*/
protected int last;
/**
* Constructs a CR/LF output stream connected to the specified output stream.
*/
public CRLFOutputStream (OutputStream out)
{
super (out);
last = -1;
}
/**
* Writes a character to the underlying stream.
* @exception IOException if an I/O error occurred
*/
public void write (int ch) throws IOException
{
if (ch == CR)
{
out.write (CRLF);
}
else if (ch == LF)
{
if (last != CR)
{
out.write (CRLF);
}
}
else
{
out.write (ch);
}
last = ch;
}
/**
* Writes a byte array to the underlying stream.
* @exception IOException if an I/O error occurred
*/
public void write(byte[] b) throws IOException
{
write (b, 0, b.length);
}
/**
* Writes a portion of a byte array to the underlying stream.
* @exception IOException if an I/O error occurred
*/
public void write (byte[] b, int off, int len) throws IOException
{
int d = off;
len += off;
for (int i = off; i < len; i++)
{
switch (b[i])
{
case CR:
out.write (b, d, i - d);
out.write (CRLF, 0, 2);
d = i + 1;
break;
case LF:
if (last != CR)
{
out.write (b, d, i - d);
out.write (CRLF, 0, 2);
}
d = i + 1;
break;
}
last = b[i];
}
if (len - d > 0)
{
out.write (b, d, len - d);
}
}
/**
* Writes the specified ASCII string to the underlying stream.
* @exception IOException if an I/O error occurred
*/
public void write (String text) throws IOException
{
try
{
byte[] bytes = text.getBytes (US_ASCII);
write (bytes, 0, bytes.length);
}
catch (UnsupportedEncodingException e)
{
throw new IOException ("The US-ASCII encoding is not supported " +
"on this system");
}
}
/**
* Writes a newline to the underlying stream.
* @exception IOException if an I/O error occurred
*/
public void writeln () throws IOException
{
out.write (CRLF, 0, 2);
}
}
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