| /* |
| * Copyright (c) 1997, 2012, 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. |
| */ |
| |
| /* |
| * @(#)QEncoderStream.java 1.4 02/03/27 |
| */ |
| |
| |
| |
| package com.sun.xml.internal.messaging.saaj.packaging.mime.util; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| /** |
| * This class implements a Q Encoder as defined by RFC 2047 for |
| * encoding MIME headers. It subclasses the QPEncoderStream class. |
| * |
| * @author John Mani |
| */ |
| |
| public class QEncoderStream extends QPEncoderStream { |
| |
| private String specials; |
| private static String WORD_SPECIALS = "=_?\"#$%&'(),.:;<>@[\\]^`{|}~"; |
| private static String TEXT_SPECIALS = "=_?"; |
| |
| /** |
| * Create a Q encoder that encodes the specified input stream |
| * @param out the output stream |
| * @param encodingWord true if we are Q-encoding a word within a |
| * phrase. |
| */ |
| public QEncoderStream(OutputStream out, boolean encodingWord) { |
| super(out, Integer.MAX_VALUE); // MAX_VALUE is 2^31, should |
| // suffice (!) to indicate that |
| // CRLFs should not be inserted |
| // when encoding rfc822 headers |
| |
| // a RFC822 "word" token has more restrictions than a |
| // RFC822 "text" token. |
| specials = encodingWord ? WORD_SPECIALS : TEXT_SPECIALS; |
| } |
| |
| /** |
| * Encodes the specified <code>byte</code> to this output stream. |
| * @param c the <code>byte</code>. |
| * @exception IOException if an I/O error occurs. |
| */ |
| public void write(int c) throws IOException { |
| c = c & 0xff; // Turn off the MSB. |
| if (c == ' ') |
| output('_', false); |
| else if (c < 040 || c >= 0177 || specials.indexOf(c) >= 0) |
| // Encoding required. |
| output(c, true); |
| else // No encoding required |
| output(c, false); |
| } |
| |
| /** |
| * Returns the length of the encoded version of this byte array. |
| */ |
| public static int encodedLength(byte[] b, boolean encodingWord) { |
| int len = 0; |
| String specials = encodingWord ? WORD_SPECIALS: TEXT_SPECIALS; |
| for (int i = 0; i < b.length; i++) { |
| int c = b[i] & 0xff; // Mask off MSB |
| if (c < 040 || c >= 0177 || specials.indexOf(c) >= 0) |
| // needs encoding |
| len += 3; // Q-encoding is 1 -> 3 conversion |
| else |
| len++; |
| } |
| return len; |
| } |
| |
| /**** begin TEST program *** |
| public static void main(String argv[]) throws Exception { |
| FileInputStream infile = new FileInputStream(argv[0]); |
| QEncoderStream encoder = new QEncoderStream(System.out); |
| int c; |
| |
| while ((c = infile.read()) != -1) |
| encoder.write(c); |
| encoder.close(); |
| } |
| *** end TEST program ***/ |
| } |