| /* |
| * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @(#)QDecoderStream.java 1.5 02/03/27 |
| */ |
| |
| |
| |
| package com.sun.xml.internal.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 <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 IOException("Error in QP stream " + nex.getMessage()); |
| } |
| } else |
| return c; |
| } |
| } |