src/org/sonews/util/io/CRLFOutputStream.java
author František Kučera <franta-hg@frantovo.cz>
Sun, 30 Oct 2011 22:13:32 +0100
changeset 112 ca54040b4409
parent 108 fdc075324ef3
permissions -rw-r--r--
DrupalAuthInfoCommand → AuthInfoCommand (je to obecná implementace, nezávislá na Drupalu)
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/* CRLFOutputStream.java --
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Copyright (C) 2002, 2003, 2004  Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING.  If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library.  Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module.  An independent module is a module which is not derived from
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or based on this library.  If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so.  If you do not wish to do so, delete this
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exception statement from your version. 
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 */
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package org.sonews.util.io; // original package: gnu.java.net
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import java.io.FilterOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.io.UnsupportedEncodingException;
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/** 
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 * An output stream that filters LFs into CR/LF pairs.
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 *
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 * @author Chris Burdess (dog@gnu.org)
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 * @version classpath-0.98
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 */
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public class CRLFOutputStream extends FilterOutputStream {
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	static final String US_ASCII = "US-ASCII";
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	/**
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	 * The CR octet.
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	 */
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	public static final int CR = 13;
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	/**
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	 * The LF octet.
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	 */
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	public static final int LF = 10;
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	/**
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	 * The CR/LF pair.
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	 */
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	public static final byte[] CRLF = {CR, LF};
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	/**
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	 * The last byte read.
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	 */
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	protected int last;
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	/**
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	 * Constructs a CR/LF output stream connected to the specified output stream.
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	 */
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	public CRLFOutputStream(OutputStream out) {
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		super(out);
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		last = -1;
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	}
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	/**
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	 * Writes a character to the underlying stream.
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	 * @exception IOException if an I/O error occurred
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	 */
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	@Override
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	public void write(int ch) throws IOException {
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		if (ch == CR) {
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			out.write(CRLF);
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		} else if (ch == LF) {
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			if (last != CR) {
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				out.write(CRLF);
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			}
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		} else {
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			out.write(ch);
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		}
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		last = ch;
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	}
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	/**
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	 * Writes a byte array to the underlying stream.
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	 * @exception IOException if an I/O error occurred
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	 */
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	@Override
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	public void write(byte[] b) throws IOException {
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		write(b, 0, b.length);
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	}
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	/**
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	 * Writes a portion of a byte array to the underlying stream.
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	 * @exception IOException if an I/O error occurred
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	 */
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	@Override
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	public void write(byte[] b, int off, int len) throws IOException {
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		int d = off;
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		len += off;
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		for (int i = off; i < len; i++) {
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			switch (b[i]) {
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				case CR:
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					out.write(b, d, i - d);
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					out.write(CRLF, 0, 2);
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					d = i + 1;
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					break;
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				case LF:
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					if (last != CR) {
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						out.write(b, d, i - d);
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						out.write(CRLF, 0, 2);
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					}
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					d = i + 1;
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					break;
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			}
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			last = b[i];
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		}
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		if (len - d > 0) {
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			out.write(b, d, len - d);
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		}
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	}
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	/**
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	 * Writes the specified ASCII string to the underlying stream.
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	 * @exception IOException if an I/O error occurred
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	 */
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	public void write(String text) throws IOException {
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		try {
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			byte[] bytes = text.getBytes(US_ASCII);
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			write(bytes, 0, bytes.length);
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		} catch (UnsupportedEncodingException e) {
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			throw new IOException("The US-ASCII encoding is not supported on this system", e);
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		}
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	}
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	/**
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	 * Writes a newline to the underlying stream.
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	 * @exception IOException if an I/O error occurred
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	 */
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	public void writeln() throws IOException {
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		out.write(CRLF, 0, 2);
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	}
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}