/* * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. * * Copyright 1997-2007 Sun Microsystems, Inc. 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://glassfish.dev.java.net/public/CDDL+GPL.html * or glassfish/bootstrap/legal/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 glassfish/bootstrap/legal/LICENSE.txt. * Sun designates this particular file as subject to the "Classpath" exception * as provided by Sun in the GPL Version 2 section of the License file that * accompanied this code.  If applicable, add the following below the License * Header, with the fields enclosed by brackets [] replaced by your own * identifying information: "Portions Copyrighted [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. *//* * @(#)SharedByteArrayInputStream.java	1.5 07/05/04 */package javax.mail.util;import java.io.*;import javax.mail.internet.SharedInputStream;/** * A ByteArrayInputStream that implements the SharedInputStream interface, * allowing the underlying byte array to be shared between multiple readers. * * @version 1.5, 07/05/04 * @author  Bill Shannon * @since JavaMail 1.4 */public class SharedByteArrayInputStream extends ByteArrayInputStream				implements SharedInputStream {    /**     * Position within shared buffer that this stream starts at.     */    protected int start = 0;    /**     * Create a SharedByteArrayInputStream representing the entire     * byte array.     *     * @param	buf	the byte array     */    public SharedByteArrayInputStream(byte[] buf) {	super(buf);    }    /**     * Create a SharedByteArrayInputStream representing the part     * of the byte array from <code>offset</code> for <code>length</code>     * bytes.     *     * @param	buf	the byte array     * @param	offset	offset in byte array to first byte to include     * @param	length	number of bytes to include     */    public SharedByteArrayInputStream(byte[] buf, int offset, int length) {	super(buf, offset, length);	start = offset;    }    /**     * Return the current position in the InputStream, as an     * offset from the beginning of the InputStream.     *     * @return  the current position     */    public long getPosition() {	return pos - start;    }    /**     * Return a new InputStream representing a subset of the data     * from this InputStream, starting at <code>start</code> (inclusive)     * up to <code>end</code> (exclusive).  <code>start</code> must be     * non-negative.  If <code>end</code> is -1, the new stream ends     * at the same place as this stream.  The returned InputStream     * will also implement the SharedInputStream interface.     *     * @param	start	the starting position     * @param	end	the ending position + 1     * @return		the new stream     */    public InputStream newStream(long start, long end) {	if (start < 0)	    throw new IllegalArgumentException("start < 0");	if (end == -1)	    end = count - this.start;	return new SharedByteArrayInputStream(buf,				this.start + (int)start, (int)(end - start));    }}