| /* |
| * Copyright (c) 1997, 2013, 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. |
| */ |
| |
| /* |
| * @(#)QPEncoderStream.java 1.6 02/03/27 |
| */ |
| |
| |
| |
| package com.sun.xml.internal.messaging.saaj.packaging.mime.util; |
| |
| import java.io.*; |
| |
| /** |
| * This class implements a Quoted Printable Encoder. It is implemented as |
| * a FilterOutputStream, so one can just wrap this class around |
| * any output stream and write bytes into this filter. The Encoding |
| * is done as the bytes are written out. |
| * |
| * @author John Mani |
| */ |
| |
| public class QPEncoderStream extends FilterOutputStream { |
| private int count = 0; // number of bytes that have been output |
| private int bytesPerLine; // number of bytes per line |
| private boolean gotSpace = false; |
| private boolean gotCR = false; |
| |
| /** |
| * Create a QP encoder that encodes the specified input stream |
| * @param out the output stream |
| * @param bytesPerLine the number of bytes per line. The encoder |
| * inserts a CRLF sequence after this many number |
| * of bytes. |
| */ |
| public QPEncoderStream(OutputStream out, int bytesPerLine) { |
| super(out); |
| // Subtract 1 to account for the '=' in the soft-return |
| // at the end of a line |
| this.bytesPerLine = bytesPerLine - 1; |
| } |
| |
| /** |
| * Create a QP encoder that encodes the specified input stream. |
| * Inserts the CRLF sequence after outputting 76 bytes. |
| * @param out the output stream |
| */ |
| public QPEncoderStream(OutputStream out) { |
| this(out, 76); |
| } |
| |
| /** |
| * Encodes <code>len</code> bytes from the specified |
| * <code>byte</code> array starting at offset <code>off</code> to |
| * this output stream. |
| * |
| * @param b the data. |
| * @param off the start offset in the data. |
| * @param len the number of bytes to write. |
| * @exception IOException if an I/O error occurs. |
| */ |
| public void write(byte[] b, int off, int len) throws IOException { |
| for (int i = 0; i < len; i++) |
| write(b[off + i]); |
| } |
| |
| /** |
| * Encodes <code>b.length</code> bytes to this output stream. |
| * @param b the data to be written. |
| * @exception IOException if an I/O error occurs. |
| */ |
| public void write(byte[] b) throws IOException { |
| write(b, 0, b.length); |
| } |
| |
| /** |
| * 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 (gotSpace) { // previous character was <SPACE> |
| if (c == '\r' || c == '\n') |
| // if CR/LF, we need to encode the <SPACE> char |
| output(' ', true); |
| else // no encoding required, just output the char |
| output(' ', false); |
| gotSpace = false; |
| } |
| |
| if (c == '\r') { |
| gotCR = true; |
| outputCRLF(); |
| } else { |
| if (c == '\n') { |
| if (gotCR) |
| // This is a CRLF sequence, we already output the |
| // corresponding CRLF when we got the CR, so ignore this |
| ; |
| else |
| outputCRLF(); |
| } else if (c == ' ') { |
| gotSpace = true; |
| } else if (c < 040 || c >= 0177 || c == '=') |
| // Encoding required. |
| output(c, true); |
| else // No encoding required |
| output(c, false); |
| // whatever it was, it wasn't a CR |
| gotCR = false; |
| } |
| } |
| |
| /** |
| * Flushes this output stream and forces any buffered output bytes |
| * to be encoded out to the stream. |
| * @exception IOException if an I/O error occurs. |
| */ |
| public void flush() throws IOException { |
| out.flush(); |
| } |
| |
| /** |
| * Forces any buffered output bytes to be encoded out to the stream |
| * and closes this output stream |
| */ |
| public void close() throws IOException { |
| out.close(); |
| } |
| |
| private void outputCRLF() throws IOException { |
| out.write('\r'); |
| out.write('\n'); |
| count = 0; |
| } |
| |
| // The encoding table |
| private final static char hex[] = { |
| '0','1', '2', '3', '4', '5', '6', '7', |
| '8','9', 'A', 'B', 'C', 'D', 'E', 'F' |
| }; |
| |
| protected void output(int c, boolean encode) throws IOException { |
| if (encode) { |
| if ((count += 3) > bytesPerLine) { |
| out.write('='); |
| out.write('\r'); |
| out.write('\n'); |
| count = 3; // set the next line's length |
| } |
| out.write('='); |
| out.write(hex[c >> 4]); |
| out.write(hex[c & 0xf]); |
| } else { |
| if (++count > bytesPerLine) { |
| out.write('='); |
| out.write('\r'); |
| out.write('\n'); |
| count = 1; // set the next line's length |
| } |
| out.write(c); |
| } |
| } |
| |
| /**** begin TEST program *** |
| public static void main(String argv[]) throws Exception { |
| FileInputStream infile = new FileInputStream(argv[0]); |
| QPEncoderStream encoder = new QPEncoderStream(System.out); |
| int c; |
| |
| while ((c = infile.read()) != -1) |
| encoder.write(c); |
| encoder.close(); |
| } |
| *** end TEST program ***/ |
| } |