jdk8-mips64-public/jaxws: src/share/jaxws_classes/com/sun/xml/internal/messaging/saaj/packaging/mime/util/QDecoderStream.java@9c07ef4934dd

     1 /*

     2  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    26 /*

    27  * @(#)QDecoderStream.java    1.5 02/03/27

    28  */

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

    34 import java.io.IOException;

    35 import java.io.InputStream;

    37 /**

    38  * This class implements a Q Decoder as defined in RFC 2047

    39  * for decoding MIME headers. It subclasses the QPDecoderStream class.

    40  *

    41  * @author John Mani

    42  */

    44 public class QDecoderStream extends QPDecoderStream {

    46     /**

    47      * Create a Q-decoder that decodes the specified input stream.

    48      * @param in        the input stream

    49      */

    50     public QDecoderStream(InputStream in) {

    51         super(in);

    52     }

    54     /**

    55      * Read the next decoded byte from this input stream. The byte

    56      * is returned as an <code>int</code> in the range <code>0</code>

    57      * to <code>255</code>. If no byte is available because the end of

    58      * the stream has been reached, the value <code>-1</code> is returned.

    59      * This method blocks until input data is available, the end of the

    60      * stream is detected, or an exception is thrown.

    61      *

    62      * @return     the next byte of data, or <code>-1</code> if the end of the

    63      *             stream is reached.

    64      * @exception  IOException  if an I/O error occurs.

    65      */

    66     public int read() throws IOException {

    67         int c = in.read();

    69         if (c == '_') // Return '_' as ' '

    70             return ' ';

    71         else if (c == '=') {

    72             // QP Encoded atom. Get the next two bytes ..

    73             ba[0] = (byte)in.read();

    74             ba[1] = (byte)in.read();

    75             // .. and decode them

    76             try {

    77                 return ASCIIUtility.parseInt(ba, 0, 2, 16);

    78             } catch (NumberFormatException nex) {

    79                 throw new IOException("Error in QP stream " + nex.getMessage());

    80             }

    81         } else

    82             return c;

    83     }

    84 }

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