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Open source Reference Implementation of JSR-67: SOAP with Attachments API for Java (SAAJ MR: 1.4)
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 *
 * 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_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
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 * file and include the License file at packager/legal/LICENSE.txt.
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 * GPL Classpath Exception:
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/*
 * @(#)QDecoderStream.java    1.5 02/03/27
 */



package com.sun.xml.messaging.saaj.packaging.mime.util;

import java.io.IOException;
import java.io.InputStream;

/**
 * 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 int in the range 0
     * to 255. If no byte is available because the end of
     * the stream has been reached, the value -1 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 -1 if the end of the
     *             stream is reached.
     * @exception  IOException  if an I/O error occurs.
     */
    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 IOException("Error in QP stream " + nex.getMessage());
	    }
	} else
	    return c;
    }
}