| /* |
| * 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 **/ |
| } |