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.

  */

 /*

  * @(#)BASE64EncoderStream.java       1.6 02/03/27

  */

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

 import java.io.*;

 /**

  * This class implements a BASE64 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

  * @author Bill Shannon

  */

 public class BASE64EncoderStream extends FilterOutputStream {

     private byte[] buffer;      // cache of bytes that are yet to be encoded

     private int bufsize = 0;    // size of the cache

     private int count = 0;      // number of bytes that have been output

     private int bytesPerLine;   // number of bytes per line

     /**

      * Create a BASE64 encoder that encodes the specified input stream

      * @param out        the output stream

      * @param bytesPerLine  number of bytes per line. The encoder inserts

      *                   a CRLF sequence after the specified number of bytes

      */

     public BASE64EncoderStream(OutputStream out, int bytesPerLine) {

         super(out);

         buffer = new byte[3];

         this.bytesPerLine = bytesPerLine;

     }

     /**

      * Create a BASE64 encoder that encodes the specified input stream.

      * Inserts the CRLF sequence after outputting 76 bytes.

      * @param out        the output stream

      */

     public BASE64EncoderStream(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 {

         buffer[bufsize++] = (byte)c;

         if (bufsize == 3) { // Encoding unit = 3 bytes

             encode();

             bufsize = 0;

         }

     }

     /**

      * 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 {

         if (bufsize > 0) { // If there's unencoded characters in the buffer ..

             encode();      // .. encode them

             bufsize = 0;

         }

         out.flush();

     }

     /**

      * Forces any buffered output bytes to be encoded out to the stream

      * and closes this output stream

      */

     public void close() throws IOException {

         flush();

         out.close();

     }

     /** This array maps the characters to their 6 bit values */

     private final static char pem_array[] = {

         'A','B','C','D','E','F','G','H', // 0

         'I','J','K','L','M','N','O','P', // 1

         'Q','R','S','T','U','V','W','X', // 2

         'Y','Z','a','b','c','d','e','f', // 3

         'g','h','i','j','k','l','m','n', // 4

         'o','p','q','r','s','t','u','v', // 5

         'w','x','y','z','0','1','2','3', // 6

         '4','5','6','7','8','9','+','/'  // 7

     };

     private void encode() throws IOException {

         // If writing out this encoded unit will cause overflow,

         // start a new line.

         if (count + 4 > bytesPerLine) {

             out.write('\r');

             out.write('\n');

             count = 0;

         }

         byte a, b, c;

         if (bufsize == 1) {

             a = buffer[0];

             b = 0;

             c = 0;

             out.write(pem_array[(a >>> 2) & 0x3F]);

             out.write(pem_array[((a << 4) & 0x30) + ((b >>> 4) & 0xf)]);

             out.write('='); // pad character

             out.write('='); // pad character

         } else if (bufsize == 2) {

             a = buffer[0];

             b = buffer[1];

             c = 0;

             out.write(pem_array[(a >>> 2) & 0x3F]);

             out.write(pem_array[((a << 4) & 0x30) + ((b >>> 4) & 0xf)]);

             out.write(pem_array[((b << 2) & 0x3c) + ((c >>> 6) & 0x3)]);

             out.write('='); // pad character

         } else {

             a = buffer[0];

             b = buffer[1];

             c = buffer[2];

             out.write(pem_array[(a >>> 2) & 0x3F]);

             out.write(pem_array[((a << 4) & 0x30) + ((b >>> 4) & 0xf)]);

             out.write(pem_array[((b << 2) & 0x3c) + ((c >>> 6) & 0x3)]);

             out.write(pem_array[c & 0x3F]);

         }

         // increment count

         count += 4;

     }

     /**

      * Base64 encode a byte array.  No line breaks are inserted.

      * This method is suitable for short strings, such as those

      * in the IMAP AUTHENTICATE protocol, but not to encode the

      * entire content of a MIME part.

      */

     public static byte[] encode(byte[] inbuf) {

         if (inbuf.length == 0)

             return inbuf;

         byte[] outbuf = new byte[((inbuf.length + 2) / 3) * 4];

         int inpos = 0, outpos = 0;

         int size = inbuf.length;

         while (size > 0) {

             byte a, b, c;

             if (size == 1) {

                 a = inbuf[inpos++];

                 b = 0;

                 c = 0;

                 outbuf[outpos++] = (byte)pem_array[(a >>> 2) & 0x3F];

                 outbuf[outpos++] =

                         (byte)pem_array[((a << 4) & 0x30) + ((b >>> 4) & 0xf)];

                 outbuf[outpos++] = (byte)'=';  // pad character

                 outbuf[outpos++] = (byte)'=';  // pad character

             } else if (size == 2) {

                 a = inbuf[inpos++];

                 b = inbuf[inpos++];

                 c = 0;

                 outbuf[outpos++] = (byte)pem_array[(a >>> 2) & 0x3F];

                 outbuf[outpos++] =

                         (byte)pem_array[((a << 4) & 0x30) + ((b >>> 4) & 0xf)];

                 outbuf[outpos++] =

                         (byte)pem_array[((b << 2) & 0x3c) + ((c >>> 6) & 0x3)];

                 outbuf[outpos++] = (byte)'=';  // pad character

             } else {

                 a = inbuf[inpos++];

                 b = inbuf[inpos++];

                 c = inbuf[inpos++];

                 outbuf[outpos++] = (byte)pem_array[(a >>> 2) & 0x3F];

                 outbuf[outpos++] =

                         (byte)pem_array[((a << 4) & 0x30) + ((b >>> 4) & 0xf)];

                 outbuf[outpos++] =

                         (byte)pem_array[((b << 2) & 0x3c) + ((c >>> 6) & 0x3)];

                 outbuf[outpos++] = (byte)pem_array[c & 0x3F];

             }

             size -= 3;

         }

         return outbuf;

     }

     /*** begin TEST program

     public static void main(String argv[]) throws Exception {

         FileInputStream infile = new FileInputStream(argv[0]);

         BASE64EncoderStream encoder = new BASE64EncoderStream(System.out);

         int c;

         while ((c = infile.read()) != -1)

             encoder.write(c);

         encoder.close();

     }

     *** end TEST program **/

 }