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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2017 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://oss.oracle.com/licenses/CDDL+GPL-1.1
 * or LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.mail.util;

import java.io.*;


/**
 * Convert lines into the canonical format, that is, terminate lines with the
 * CRLF sequence.
 * 
 * @author John Mani
 */
public class CRLFOutputStream extends FilterOutputStream {
    protected int lastb = -1;
    protected boolean atBOL = true;	// at beginning of line?
    private static final byte[] newline = { (byte)'\r', (byte)'\n' };

    public CRLFOutputStream(OutputStream os) {
	super(os);
    }

    @Override
    public void write(int b) throws IOException {
	if (b == '\r') {
	    writeln();
	} else if (b == '\n') {
	    if (lastb != '\r')
		writeln();
	} else {
	    out.write(b);
	    atBOL = false;
	}
	lastb = b;
    }

    @Override
    public void write(byte b[]) throws IOException {
	write(b, 0, b.length);
    }

    @Override
    public void write(byte b[], int off, int len) throws IOException {
	int start = off;
	
	len += off;
	for (int i = start; i < len ; i++) {
	    if (b[i] == '\r') {
		out.write(b, start, i - start);
		writeln();
		start = i + 1;
	    } else if (b[i] == '\n') {
		if (lastb != '\r') {
		    out.write(b, start, i - start);
		    writeln();
		}
		start = i + 1;
	    }
	    lastb = b[i];
	}
	if ((len - start) > 0) {
	    out.write(b, start, len - start);
	    atBOL = false;
	}
    }

    /*
     * Just write out a new line, something similar to out.println()
     */
    public void writeln() throws IOException {
        out.write(newline);
	atBOL = true;
    }
}