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/*
* CRLFOutputStream.java
* 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
*
* Linking this library statically or dynamically with other modules is
* making a combined work based on this library. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
*
* As a special exception, the copyright holders of this library give you
* permission to link this library with independent modules to produce an
* executable, regardless of the license terms of these independent
* modules, and to copy and distribute the resulting executable under
* terms of your choice, provided that you also meet, for each linked
* independent module, the terms and conditions of the license of that
* module. An independent module is a module which is not derived from
* or based on this library. If you modify this library, you may extend
* this exception to your version of the library, but you are not
* obliged to do so. If you do not wish to do so, delete this
* exception statement from your version.
*/
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>
*/
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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