Mercurial > jdk8-mips64-public > jaxws / file revision

 /*

  * 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.

  */

 /*

  * @(#)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 ***/

 }