JavaMail 1.6.2 Source Code Files

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com/sun/mail/util/QDecoderStream.java

/*
 * 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.*;

/**
 * This class implements a Q Decoder as defined in RFC 2047
 * for decoding MIME headers. It subclasses the QPDecoderStream class.
 * 
 * @author John Mani
 */

public class QDecoderStream extends QPDecoderStream {

    /**
     * Create a Q-decoder that decodes the specified input stream.
     * @param in        the input stream
     */
    public QDecoderStream(InputStream in) {
	super(in);
    }

    /**
     * Read the next decoded byte from this input stream. The byte
     * is returned as an <code>int</code> in the range <code>0</code>
     * to <code>255</code>. If no byte is available because the end of
     * the stream has been reached, the value <code>-1</code> is returned.
     * This method blocks until input data is available, the end of the
     * stream is detected, or an exception is thrown.
     *
     * @return     the next byte of data, or <code>-1</code> if the end of the
     *             stream is reached.
     * @exception  IOException  if an I/O error occurs.
     */
    @Override
    public int read() throws IOException {
	int c = in.read();

	if (c == '_') // Return '_' as ' '
	    return ' ';
	else if (c == '=') {
	    // QP Encoded atom. Get the next two bytes ..
	    ba[0] = (byte)in.read();
	    ba[1] = (byte)in.read();
	    // .. and decode them
	    try {
		return ASCIIUtility.parseInt(ba, 0, 2, 16);
	    } catch (NumberFormatException nex) {
		throw new DecodingException(
			"QDecoder: Error in QP stream " + nex.getMessage());
	    }
	} else
	    return c;
    }
}

com/sun/mail/util/QDecoderStream.java

 

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File name: javax.mail-1.6.2-sources.jar
File size: 851487 bytes
Release date: 2018-08-29
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