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From rwins...@apache.org
Subject svn commit: r922776 - in /commons/proper/net/branches/NET_2_0/src/main/java: examples/ftp/FTPExample.java org/apache/commons/net/ftp/FTPHTTPClient.java org/apache/commons/net/util/Base64.java
Date Sun, 14 Mar 2010 06:36:13 GMT
Author: rwinston
Date: Sun Mar 14 06:36:13 2010
New Revision: 922776

URL: http://svn.apache.org/viewvc?rev=922776&view=rev
Log:
Add initial (experimental) support for FTP over HTTP tunneling

Added:
    commons/proper/net/branches/NET_2_0/src/main/java/org/apache/commons/net/ftp/FTPHTTPClient.java
    commons/proper/net/branches/NET_2_0/src/main/java/org/apache/commons/net/util/Base64.java
Modified:
    commons/proper/net/branches/NET_2_0/src/main/java/examples/ftp/FTPExample.java

Modified: commons/proper/net/branches/NET_2_0/src/main/java/examples/ftp/FTPExample.java
URL: http://svn.apache.org/viewvc/commons/proper/net/branches/NET_2_0/src/main/java/examples/ftp/FTPExample.java?rev=922776&r1=922775&r2=922776&view=diff
==============================================================================
--- commons/proper/net/branches/NET_2_0/src/main/java/examples/ftp/FTPExample.java (original)
+++ commons/proper/net/branches/NET_2_0/src/main/java/examples/ftp/FTPExample.java Sun Mar 14 06:36:13 2010
@@ -22,12 +22,14 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.io.PrintStream;
 import java.io.PrintWriter;
 
 import org.apache.commons.net.PrintCommandListener;
 import org.apache.commons.net.ftp.FTP;
 import org.apache.commons.net.ftp.FTPClient;
 import org.apache.commons.net.ftp.FTPConnectionClosedException;
+import org.apache.commons.net.ftp.FTPFile;
 import org.apache.commons.net.ftp.FTPReply;
 
 /***
@@ -40,152 +42,22 @@ import org.apache.commons.net.ftp.FTPRep
  * Usage: ftp [-s] [-b] <hostname> <username> <password> <remote file> <local file>
  * <p>
  ***/
-public final class FTPExample
-{
+public final class FTPExample {
 
-    public static final String USAGE =
-        "Usage: ftp [-s] [-b] <hostname> <username> <password> <remote file> <local file>\n" +
-        "\nDefault behavior is to download a file and use ASCII transfer mode.\n" +
-        "\t-s store file on server (upload)\n" +
-        "\t-b use binary transfer mode\n";
-
-    public static final void main(String[] args)
+    public static final void main(String[] args) throws IOException
     {
-        int base = 0;
-        boolean storeFile = false, binaryTransfer = false, error = false;
-        String server, username, password, remote, local;
-        FTPClient ftp;
-
-        for (base = 0; base < args.length; base++)
-        {
-            if (args[base].startsWith("-s"))
-                storeFile = true;
-            else if (args[base].startsWith("-b"))
-                binaryTransfer = true;
-            else
-                break;
-        }
-
-        if ((args.length - base) != 5)
-        {
-            System.err.println(USAGE);
-            System.exit(1);
-        }
-
-        server = args[base++];
-        username = args[base++];
-        password = args[base++];
-        remote = args[base++];
-        local = args[base];
-
-        ftp = new FTPClient();
-        ftp.addProtocolCommandListener(new PrintCommandListener(
-                                           new PrintWriter(System.out)));
-
-        try
-        {
-            int reply;
-            ftp.connect(server);
-            System.out.println("Connected to " + server + ".");
-
-            // After connection attempt, you should check the reply code to verify
-            // success.
-            reply = ftp.getReplyCode();
-
-            if (!FTPReply.isPositiveCompletion(reply))
-            {
-                ftp.disconnect();
-                System.err.println("FTP server refused connection.");
-                System.exit(1);
-            }
-        }
-        catch (IOException e)
-        {
-            if (ftp.isConnected())
-            {
-                try
-                {
-                    ftp.disconnect();
-                }
-                catch (IOException f)
-                {
-                    // do nothing
-                }
-            }
-            System.err.println("Could not connect to server.");
-            e.printStackTrace();
-            System.exit(1);
-        }
-
-__main:
-        try
-        {
-            if (!ftp.login(username, password))
-            {
-                ftp.logout();
-                error = true;
-                break __main;
-            }
-
-            System.out.println("Remote system is " + ftp.getSystemName());
-
-            if (binaryTransfer)
-                ftp.setFileType(FTP.BINARY_FILE_TYPE);
-
-            // Use passive mode as default because most of us are
-            // behind firewalls these days.
-            ftp.enterLocalPassiveMode();
-
-            if (storeFile)
-            {
-                InputStream input;
-
-                input = new FileInputStream(local);
-
-                ftp.storeFile(remote, input);
-
-                input.close();
-            }
-            else
-            {
-                OutputStream output;
-
-                output = new FileOutputStream(local);
-
-                ftp.retrieveFile(remote, output);
-
-                output.close();
-            }
-
-            ftp.logout();
-        }
-        catch (FTPConnectionClosedException e)
-        {
-            error = true;
-            System.err.println("Server closed connection.");
-            e.printStackTrace();
-        }
-        catch (IOException e)
-        {
-            error = true;
-            e.printStackTrace();
-        }
-        finally
-        {
-            if (ftp.isConnected())
-            {
-                try
-                {
-                    ftp.disconnect();
-                }
-                catch (IOException f)
-                {
-                    // do nothing
-                }
-            }
-        }
-
-        System.exit(error ? 1 : 0);
+       FTPClient client = new FTPClient();
+       client.setControlEncoding("utf-8");
+       client.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out)));
+       client.connect("localhost");
+       client.login("rory", "yi6bovak");
+       
+       PrintStream out = new PrintStream(System.out, true, "utf-8");
+
+       for (FTPFile file  : client.listFiles())
+    	   out.println(file.getName());
+       
+       out.println("你好吗");
     } // end main
 
 }

Added: commons/proper/net/branches/NET_2_0/src/main/java/org/apache/commons/net/ftp/FTPHTTPClient.java
URL: http://svn.apache.org/viewvc/commons/proper/net/branches/NET_2_0/src/main/java/org/apache/commons/net/ftp/FTPHTTPClient.java?rev=922776&view=auto
==============================================================================
--- commons/proper/net/branches/NET_2_0/src/main/java/org/apache/commons/net/ftp/FTPHTTPClient.java (added)
+++ commons/proper/net/branches/NET_2_0/src/main/java/org/apache/commons/net/ftp/FTPHTTPClient.java Sun Mar 14 06:36:13 2010
@@ -0,0 +1,145 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.commons.net.ftp;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.UnsupportedEncodingException;
+import java.net.Socket;
+import java.net.SocketException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.commons.net.util.Base64;
+
+/**
+ * Experimental attempt at FTP client that tunnels over an HTTP proxy connection.
+ * 
+ * @author rory
+ *
+ */
+public class FTPHTTPClient extends FTPClient {
+	private final String proxyHost;
+	private int proxyPort;
+	private final String proxyUsername;
+	private final String proxyPassword;
+	private String host;
+	private int port;
+
+	private final byte[] CRLF;
+	private final Base64 base64 = new Base64();
+
+	public FTPHTTPClient(String proxyHost, int proxyPort, String proxyUser, String proxyPass) {
+		this.proxyHost = proxyHost;
+		this.proxyPort = proxyPort;
+		this.proxyUsername = proxyUser;
+		this.proxyPassword = proxyPass;
+
+		try {
+			CRLF = "\r\n".getBytes(getControlEncoding());
+		} catch (UnsupportedEncodingException e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+	public FTPHTTPClient(String proxyHost, int proxyPort) {
+		this(proxyHost, proxyPort, null, null);
+	}
+
+	
+	@Override
+	protected Socket _openDataConnection_(int command, String arg)
+	throws IOException {
+		Socket socket = new Socket(host, port);
+		InputStream is = socket.getInputStream();
+		OutputStream os = socket.getOutputStream();
+
+		tunnelHandshake(host, port, is, os);
+
+		return socket;
+	}
+
+	public void connect(String host, int port) throws SocketException,
+	IOException {
+		this.host = host;
+		this.port = port;
+
+		_socket_ = new Socket(proxyHost, proxyPort);
+		_input_ = _socket_.getInputStream();
+		_output_ = _socket_.getOutputStream();
+		try {
+			tunnelHandshake(host, port, _input_, _output_);
+		} 
+		catch (Exception e) {
+			throw new IOException(e);
+		}
+	}
+
+	private void tunnelHandshake(String host, int port, InputStream input, OutputStream output) throws IOException,
+	UnsupportedEncodingException {
+		final String connectString = "CONNECT "  + host + ":" + port  + " HTTP/1.1";
+
+		_output_.write(connectString.getBytes(getControlEncoding()));
+		_output_.write(CRLF);
+
+		if (proxyUsername != null && proxyPassword != null) {
+			final String header = "Proxy-Authorization: Basic "
+				+ base64.encode(proxyUsername + ":" + proxyPassword) + "\r\n";
+			_output_.write(header.getBytes("UTF-8"));
+			_output_.write(CRLF);
+			
+			List<String> response = new ArrayList<String>();
+			BufferedReader reader = new BufferedReader(
+					new InputStreamReader(_input_));
+
+			for (String line = reader.readLine(); line != null
+			&& line.length() > 0; line = reader.readLine()) {
+				response.add(line);
+			}
+			
+			int size = response.size();
+			if (size == 0) {
+				throw new IOException("No response from proxy");
+			}
+
+			String code = null;
+			String resp = (String) response.get(0);
+			if (resp.startsWith("HTTP/") && resp.length() >= 12) {
+				code = resp.substring(9, 12);
+			} else {
+				throw new IOException("Invalid response from proxy: " + resp);
+			}
+
+			if (!"200".equals(code)) {
+				StringBuilder msg = new StringBuilder();
+				msg.append("HTTPTunnelConnector: connection failed\r\n");
+				msg.append("Response received from the proxy:\r\n");
+				for (String line : response) {
+					msg.append(line);
+					msg.append("\r\n");
+				}
+				throw new IOException(msg.toString());
+			}
+		}
+	}
+}
+
+

Added: commons/proper/net/branches/NET_2_0/src/main/java/org/apache/commons/net/util/Base64.java
URL: http://svn.apache.org/viewvc/commons/proper/net/branches/NET_2_0/src/main/java/org/apache/commons/net/util/Base64.java?rev=922776&view=auto
==============================================================================
--- commons/proper/net/branches/NET_2_0/src/main/java/org/apache/commons/net/util/Base64.java (added)
+++ commons/proper/net/branches/NET_2_0/src/main/java/org/apache/commons/net/util/Base64.java Sun Mar 14 06:36:13 2010
@@ -0,0 +1,1046 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.commons.net.util;
+
+import java.io.UnsupportedEncodingException;
+import java.math.BigInteger;
+
+
+
+/**
+ * Provides Base64 encoding and decoding as defined by RFC 2045.
+ * 
+ * <p>
+ * This class implements section <cite>6.8. Base64 Content-Transfer-Encoding</cite> from RFC 2045 <cite>Multipurpose
+ * Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies</cite> by Freed and Borenstein.
+ * </p>
+ * <p>
+ * The class can be parameterized in the following manner with various constructors:
+ * <ul>
+ * <li>URL-safe mode: Default off.</li>
+ * <li>Line length: Default 76. Line length that aren't multiples of 4 will still essentially end up being multiples of
+ * 4 in the encoded data.
+ * <li>Line separator: Default is CRLF ("\r\n")</li>
+ * </ul>
+ * </p>
+ * <p>
+ * Since this class operates directly on byte streams, and not character streams, it is hard-coded to only encode/decode
+ * character encodings which are compatible with the lower 127 ASCII chart (ISO-8859-1, Windows-1252, UTF-8, etc).
+ * </p>
+ * 
+ * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a>
+ * @author Apache Software Foundation
+ * @since 1.0
+ * @version $Id$
+ */
+public class Base64 {
+    private static final int DEFAULT_BUFFER_RESIZE_FACTOR = 2;
+
+    private static final int DEFAULT_BUFFER_SIZE = 8192;
+
+    /**
+     * Chunk size per RFC 2045 section 6.8.
+     * 
+     * <p>
+     * The {@value} character limit does not count the trailing CRLF, but counts all other characters, including any
+     * equal signs.
+     * </p>
+     * 
+     * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 6.8</a>
+     */
+    static final int CHUNK_SIZE = 76;
+
+    /**
+     * Chunk separator per RFC 2045 section 2.1.
+     *
+     * <p>
+     * N.B. The next major release may break compatibility and make this field private.
+     * </p>
+     * 
+     * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 2.1</a>
+     */
+    static final byte[] CHUNK_SEPARATOR = {'\r', '\n'};
+
+    /**
+     * This array is a lookup table that translates 6-bit positive integer index values into their "Base64 Alphabet"
+     * equivalents as specified in Table 1 of RFC 2045.
+     * 
+     * Thanks to "commons" project in ws.apache.org for this code.
+     * http://svn.apache.org/repos/asf/webservices/commons/trunk/modules/util/
+     */
+    private static final byte[] STANDARD_ENCODE_TABLE = {
+            'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
+            'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
+            'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
+            'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
+    };
+
+    /**
+     * This is a copy of the STANDARD_ENCODE_TABLE above, but with + and /
+     * changed to - and _ to make the encoded Base64 results more URL-SAFE.
+     * This table is only used when the Base64's mode is set to URL-SAFE.
+     */    
+    private static final byte[] URL_SAFE_ENCODE_TABLE = {
+            'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
+            'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
+            'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
+            'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-', '_'
+    };
+
+    /**
+     * Byte used to pad output.
+     */
+    private static final byte PAD = '=';
+
+    /**
+     * This array is a lookup table that translates Unicode characters drawn from the "Base64 Alphabet" (as specified in
+     * Table 1 of RFC 2045) into their 6-bit positive integer equivalents. Characters that are not in the Base64
+     * alphabet but fall within the bounds of the array are translated to -1.
+     * 
+     * Note: '+' and '-' both decode to 62. '/' and '_' both decode to 63. This means decoder seamlessly handles both
+     * URL_SAFE and STANDARD base64. (The encoder, on the other hand, needs to know ahead of time what to emit).
+     * 
+     * Thanks to "commons" project in ws.apache.org for this code.
+     * http://svn.apache.org/repos/asf/webservices/commons/trunk/modules/util/
+     */
+    private static final byte[] DECODE_TABLE = {
+            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+            -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, 62, -1, 63, 52, 53, 54,
+            55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4,
+            5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
+            24, 25, -1, -1, -1, -1, 63, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34,
+            35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51
+    };
+
+    /** Mask used to extract 6 bits, used when encoding */
+    private static final int MASK_6BITS = 0x3f;
+
+    /** Mask used to extract 8 bits, used in decoding base64 bytes */
+    private static final int MASK_8BITS = 0xff;
+
+    // The static final fields above are used for the original static byte[] methods on Base64.
+    // The private member fields below are used with the new streaming approach, which requires
+    // some state be preserved between calls of encode() and decode().
+
+    /**
+     * Encode table to use: either STANDARD or URL_SAFE. Note: the DECODE_TABLE above remains static because it is able
+     * to decode both STANDARD and URL_SAFE streams, but the encodeTable must be a member variable so we can switch
+     * between the two modes.
+     */
+    private final byte[] encodeTable;
+
+    /**
+     * Line length for encoding. Not used when decoding. A value of zero or less implies no chunking of the base64
+     * encoded data.
+     */
+    private final int lineLength;
+
+    /**
+     * Line separator for encoding. Not used when decoding. Only used if lineLength > 0.
+     */
+    private final byte[] lineSeparator;
+
+    /**
+     * Convenience variable to help us determine when our buffer is going to run out of room and needs resizing.
+     * <code>decodeSize = 3 + lineSeparator.length;</code>
+     */
+    private final int decodeSize;
+
+    /**
+     * Convenience variable to help us determine when our buffer is going to run out of room and needs resizing.
+     * <code>encodeSize = 4 + lineSeparator.length;</code>
+     */
+    private final int encodeSize;
+
+    /**
+     * Buffer for streaming.
+     */
+    private byte[] buffer;
+
+    /**
+     * Position where next character should be written in the buffer.
+     */
+    private int pos;
+
+    /**
+     * Position where next character should be read from the buffer.
+     */
+    private int readPos;
+
+    /**
+     * Variable tracks how many characters have been written to the current line. Only used when encoding. We use it to
+     * make sure each encoded line never goes beyond lineLength (if lineLength > 0).
+     */
+    private int currentLinePos;
+
+    /**
+     * Writes to the buffer only occur after every 3 reads when encoding, an every 4 reads when decoding. This variable
+     * helps track that.
+     */
+    private int modulus;
+
+    /**
+     * Boolean flag to indicate the EOF has been reached. Once EOF has been reached, this Base64 object becomes useless,
+     * and must be thrown away.
+     */
+    private boolean eof;
+
+    /**
+     * Place holder for the 3 bytes we're dealing with for our base64 logic. Bitwise operations store and extract the
+     * base64 encoding or decoding from this variable.
+     */
+    private int x;
+
+    /**
+     * Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.
+     * <p>
+     * When encoding the line length is 76, the line separator is CRLF, and the encoding table is STANDARD_ENCODE_TABLE.
+     * </p>
+     * 
+     * <p>
+     * When decoding all variants are supported.
+     * </p>
+     */
+    public Base64() {
+        this(false);
+    }
+
+    /**
+     * Creates a Base64 codec used for decoding (all modes) and encoding in the given URL-safe mode.
+     * <p>
+     * When encoding the line length is 76, the line separator is CRLF, and the encoding table is STANDARD_ENCODE_TABLE.
+     * </p>
+     * 
+     * <p>
+     * When decoding all variants are supported.
+     * </p>
+     * 
+     * @param urlSafe
+     *            if <code>true</code>, URL-safe encoding is used. In most cases this should be set to
+     *            <code>false</code>.
+     * @since 1.4
+     */
+    public Base64(boolean urlSafe) {
+        this(CHUNK_SIZE, CHUNK_SEPARATOR, urlSafe);
+    }
+
+    /**
+     * Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.
+     * <p>
+     * When encoding the line length is given in the constructor, the line separator is CRLF, and the encoding table is
+     * STANDARD_ENCODE_TABLE.
+     * </p>
+     * <p>
+     * Line lengths that aren't multiples of 4 will still essentially end up being multiples of 4 in the encoded data.
+     * </p>
+     * <p>
+     * When decoding all variants are supported.
+     * </p>
+     * 
+     * @param lineLength
+     *            Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 4).
+     *            If lineLength <= 0, then the output will not be divided into lines (chunks). Ignored when decoding.
+     * @since 1.4
+     */
+    public Base64(int lineLength) {
+        this(lineLength, CHUNK_SEPARATOR);
+    }
+
+    /**
+     * Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.
+     * <p>
+     * When encoding the line length and line separator are given in the constructor, and the encoding table is
+     * STANDARD_ENCODE_TABLE.
+     * </p>
+     * <p>
+     * Line lengths that aren't multiples of 4 will still essentially end up being multiples of 4 in the encoded data.
+     * </p>
+     * <p>
+     * When decoding all variants are supported.
+     * </p>
+     * 
+     * @param lineLength
+     *            Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 4).
+     *            If lineLength <= 0, then the output will not be divided into lines (chunks). Ignored when decoding.
+     * @param lineSeparator
+     *            Each line of encoded data will end with this sequence of bytes.
+     * @throws IllegalArgumentException
+     *             Thrown when the provided lineSeparator included some base64 characters.
+     * @since 1.4
+     */
+    public Base64(int lineLength, byte[] lineSeparator) {
+        this(lineLength, lineSeparator, false);
+    }
+
+    /**
+     * Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.
+     * <p>
+     * When encoding the line length and line separator are given in the constructor, and the encoding table is
+     * STANDARD_ENCODE_TABLE.
+     * </p>
+     * <p>
+     * Line lengths that aren't multiples of 4 will still essentially end up being multiples of 4 in the encoded data.
+     * </p>
+     * <p>
+     * When decoding all variants are supported.
+     * </p>
+     * 
+     * @param lineLength
+     *            Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 4).
+     *            If lineLength <= 0, then the output will not be divided into lines (chunks). Ignored when decoding.
+     * @param lineSeparator
+     *            Each line of encoded data will end with this sequence of bytes.
+     * @param urlSafe
+     *            Instead of emitting '+' and '/' we emit '-' and '_' respectively. urlSafe is only applied to encode
+     *            operations. Decoding seamlessly handles both modes.
+     * @throws IllegalArgumentException
+     *             The provided lineSeparator included some base64 characters. That's not going to work!
+     * @since 1.4
+     */
+    public Base64(int lineLength, byte[] lineSeparator, boolean urlSafe) {
+        if (lineSeparator == null) {
+            lineLength = 0;  // disable chunk-separating
+            lineSeparator = CHUNK_SEPARATOR;  // this just gets ignored
+        }
+        this.lineLength = lineLength > 0 ? (lineLength / 4) * 4 : 0;
+        this.lineSeparator = new byte[lineSeparator.length];
+        System.arraycopy(lineSeparator, 0, this.lineSeparator, 0, lineSeparator.length);
+        if (lineLength > 0) {
+            this.encodeSize = 4 + lineSeparator.length;
+        } else {
+            this.encodeSize = 4;
+        }
+        this.decodeSize = this.encodeSize - 1;
+        if (containsBase64Byte(lineSeparator)) {
+            String sep = newStringUtf8(lineSeparator);
+            throw new IllegalArgumentException("lineSeperator must not contain base64 characters: [" + sep + "]");
+        }
+        this.encodeTable = urlSafe ? URL_SAFE_ENCODE_TABLE : STANDARD_ENCODE_TABLE;
+    }
+
+    /**
+     * Returns our current encode mode. True if we're URL-SAFE, false otherwise.
+     * 
+     * @return true if we're in URL-SAFE mode, false otherwise.
+     * @since 1.4
+     */
+    public boolean isUrlSafe() {
+        return this.encodeTable == URL_SAFE_ENCODE_TABLE;
+    }
+
+    /**
+     * Returns true if this Base64 object has buffered data for reading.
+     * 
+     * @return true if there is Base64 object still available for reading.
+     */
+    boolean hasData() {
+        return this.buffer != null;
+    }
+
+    /**
+     * Returns the amount of buffered data available for reading.
+     * 
+     * @return The amount of buffered data available for reading.
+     */
+    int avail() {
+        return buffer != null ? pos - readPos : 0;
+    }
+
+    /** Doubles our buffer. */
+    private void resizeBuffer() {
+        if (buffer == null) {
+            buffer = new byte[DEFAULT_BUFFER_SIZE];
+            pos = 0;
+            readPos = 0;
+        } else {
+            byte[] b = new byte[buffer.length * DEFAULT_BUFFER_RESIZE_FACTOR];
+            System.arraycopy(buffer, 0, b, 0, buffer.length);
+            buffer = b;
+        }
+    }
+
+    /**
+     * Extracts buffered data into the provided byte[] array, starting at position bPos, up to a maximum of bAvail
+     * bytes. Returns how many bytes were actually extracted.
+     * 
+     * @param b
+     *            byte[] array to extract the buffered data into.
+     * @param bPos
+     *            position in byte[] array to start extraction at.
+     * @param bAvail
+     *            amount of bytes we're allowed to extract. We may extract fewer (if fewer are available).
+     * @return The number of bytes successfully extracted into the provided byte[] array.
+     */
+    int readResults(byte[] b, int bPos, int bAvail) {
+        if (buffer != null) {
+            int len = Math.min(avail(), bAvail);
+            if (buffer != b) {
+                System.arraycopy(buffer, readPos, b, bPos, len);
+                readPos += len;
+                if (readPos >= pos) {
+                    buffer = null;
+                }
+            } else {
+                // Re-using the original consumer's output array is only
+                // allowed for one round.
+                buffer = null;
+            }
+            return len;
+        }
+        return eof ? -1 : 0;
+    }
+
+    /**
+     * Sets the streaming buffer. This is a small optimization where we try to buffer directly to the consumer's output
+     * array for one round (if the consumer calls this method first) instead of starting our own buffer.
+     * 
+     * @param out
+     *            byte[] array to buffer directly to.
+     * @param outPos
+     *            Position to start buffering into.
+     * @param outAvail
+     *            Amount of bytes available for direct buffering.
+     */
+    void setInitialBuffer(byte[] out, int outPos, int outAvail) {
+        // We can re-use consumer's original output array under
+        // special circumstances, saving on some System.arraycopy().
+        if (out != null && out.length == outAvail) {
+            buffer = out;
+            pos = outPos;
+            readPos = outPos;
+        }
+    }
+
+    /**
+     * <p>
+     * Encodes all of the provided data, starting at inPos, for inAvail bytes. Must be called at least twice: once with
+     * the data to encode, and once with inAvail set to "-1" to alert encoder that EOF has been reached, so flush last
+     * remaining bytes (if not multiple of 3).
+     * </p>
+     * <p>
+     * Thanks to "commons" project in ws.apache.org for the bitwise operations, and general approach.
+     * http://svn.apache.org/repos/asf/webservices/commons/trunk/modules/util/
+     * </p>
+     * 
+     * @param in
+     *            byte[] array of binary data to base64 encode.
+     * @param inPos
+     *            Position to start reading data from.
+     * @param inAvail
+     *            Amount of bytes available from input for encoding.
+     */
+    void encode(byte[] in, int inPos, int inAvail) {
+        if (eof) {
+            return;
+        }
+        // inAvail < 0 is how we're informed of EOF in the underlying data we're
+        // encoding.
+        if (inAvail < 0) {
+            eof = true;
+            if (buffer == null || buffer.length - pos < encodeSize) {
+                resizeBuffer();
+            }
+            switch (modulus) {
+                case 1 :
+                    buffer[pos++] = encodeTable[(x >> 2) & MASK_6BITS];
+                    buffer[pos++] = encodeTable[(x << 4) & MASK_6BITS];
+                    // URL-SAFE skips the padding to further reduce size.
+                    if (encodeTable == STANDARD_ENCODE_TABLE) {
+                        buffer[pos++] = PAD;
+                        buffer[pos++] = PAD;
+                    }
+                    break;
+
+                case 2 :
+                    buffer[pos++] = encodeTable[(x >> 10) & MASK_6BITS];
+                    buffer[pos++] = encodeTable[(x >> 4) & MASK_6BITS];
+                    buffer[pos++] = encodeTable[(x << 2) & MASK_6BITS];
+                    // URL-SAFE skips the padding to further reduce size.
+                    if (encodeTable == STANDARD_ENCODE_TABLE) {
+                        buffer[pos++] = PAD;
+                    }
+                    break;
+            }
+            if (lineLength > 0 && pos > 0) {
+                System.arraycopy(lineSeparator, 0, buffer, pos, lineSeparator.length);
+                pos += lineSeparator.length;
+            }
+        } else {
+            for (int i = 0; i < inAvail; i++) {
+                if (buffer == null || buffer.length - pos < encodeSize) {
+                    resizeBuffer();
+                }
+                modulus = (++modulus) % 3;
+                int b = in[inPos++];
+                if (b < 0) {
+                    b += 256;
+                }
+                x = (x << 8) + b;
+                if (0 == modulus) {
+                    buffer[pos++] = encodeTable[(x >> 18) & MASK_6BITS];
+                    buffer[pos++] = encodeTable[(x >> 12) & MASK_6BITS];
+                    buffer[pos++] = encodeTable[(x >> 6) & MASK_6BITS];
+                    buffer[pos++] = encodeTable[x & MASK_6BITS];
+                    currentLinePos += 4;
+                    if (lineLength > 0 && lineLength <= currentLinePos) {
+                        System.arraycopy(lineSeparator, 0, buffer, pos, lineSeparator.length);
+                        pos += lineSeparator.length;
+                        currentLinePos = 0;
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * <p>
+     * Decodes all of the provided data, starting at inPos, for inAvail bytes. Should be called at least twice: once
+     * with the data to decode, and once with inAvail set to "-1" to alert decoder that EOF has been reached. The "-1"
+     * call is not necessary when decoding, but it doesn't hurt, either.
+     * </p>
+     * <p>
+     * Ignores all non-base64 characters. This is how chunked (e.g. 76 character) data is handled, since CR and LF are
+     * silently ignored, but has implications for other bytes, too. This method subscribes to the garbage-in,
+     * garbage-out philosophy: it will not check the provided data for validity.
+     * </p>
+     * <p>
+     * Thanks to "commons" project in ws.apache.org for the bitwise operations, and general approach.
+     * http://svn.apache.org/repos/asf/webservices/commons/trunk/modules/util/
+     * </p>
+     * 
+     * @param in
+     *            byte[] array of ascii data to base64 decode.
+     * @param inPos
+     *            Position to start reading data from.
+     * @param inAvail
+     *            Amount of bytes available from input for encoding.
+     */
+    void decode(byte[] in, int inPos, int inAvail) {
+        if (eof) {
+            return;
+        }
+        if (inAvail < 0) {
+            eof = true;
+        }
+        for (int i = 0; i < inAvail; i++) {
+            if (buffer == null || buffer.length - pos < decodeSize) {
+                resizeBuffer();
+            }
+            byte b = in[inPos++];
+            if (b == PAD) {
+                // We're done.
+                eof = true;
+                break;
+            } else {
+                if (b >= 0 && b < DECODE_TABLE.length) {
+                    int result = DECODE_TABLE[b];
+                    if (result >= 0) {
+                        modulus = (++modulus) % 4;
+                        x = (x << 6) + result;
+                        if (modulus == 0) {
+                            buffer[pos++] = (byte) ((x >> 16) & MASK_8BITS);
+                            buffer[pos++] = (byte) ((x >> 8) & MASK_8BITS);
+                            buffer[pos++] = (byte) (x & MASK_8BITS);
+                        }
+                    }
+                }
+            }
+        }
+
+        // Two forms of EOF as far as base64 decoder is concerned: actual
+        // EOF (-1) and first time '=' character is encountered in stream.
+        // This approach makes the '=' padding characters completely optional.
+        if (eof && modulus != 0) {
+            x = x << 6;
+            switch (modulus) {
+                case 2 :
+                    x = x << 6;
+                    buffer[pos++] = (byte) ((x >> 16) & MASK_8BITS);
+                    break;
+                case 3 :
+                    buffer[pos++] = (byte) ((x >> 16) & MASK_8BITS);
+                    buffer[pos++] = (byte) ((x >> 8) & MASK_8BITS);
+                    break;
+            }
+        }
+    }
+
+    /**
+     * Returns whether or not the <code>octet</code> is in the base 64 alphabet.
+     * 
+     * @param octet
+     *            The value to test
+     * @return <code>true</code> if the value is defined in the the base 64 alphabet, <code>false</code> otherwise.
+     * @since 1.4
+     */
+    public static boolean isBase64(byte octet) {
+        return octet == PAD || (octet >= 0 && octet < DECODE_TABLE.length && DECODE_TABLE[octet] != -1);
+    }
+
+    /**
+     * Tests a given byte array to see if it contains only valid characters within the Base64 alphabet. Currently the
+     * method treats whitespace as valid.
+     * 
+     * @param arrayOctet
+     *            byte array to test
+     * @return <code>true</code> if all bytes are valid characters in the Base64 alphabet or if the byte array is empty;
+     *         false, otherwise
+     */
+    public static boolean isArrayByteBase64(byte[] arrayOctet) {
+        for (int i = 0; i < arrayOctet.length; i++) {
+            if (!isBase64(arrayOctet[i]) && !isWhiteSpace(arrayOctet[i])) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Tests a given byte array to see if it contains only valid characters within the Base64 alphabet.
+     * 
+     * @param arrayOctet
+     *            byte array to test
+     * @return <code>true</code> if any byte is a valid character in the Base64 alphabet; false herwise
+     */
+    private static boolean containsBase64Byte(byte[] arrayOctet) {
+        for (int i = 0; i < arrayOctet.length; i++) {
+            if (isBase64(arrayOctet[i])) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Encodes binary data using the base64 algorithm but does not chunk the output.
+     * 
+     * @param binaryData
+     *            binary data to encode
+     * @return byte[] containing Base64 characters in their UTF-8 representation.
+     */
+    public static byte[] encodeBase64(byte[] binaryData) {
+        return encodeBase64(binaryData, false);
+    }
+
+    /**
+     * Encodes binary data using the base64 algorithm into 76 character blocks separated by CRLF.
+     *
+     * @param binaryData
+     *            binary data to encode
+     * @return String containing Base64 characters.
+     * @since 1.4
+     */    
+    public static String encodeBase64String(byte[] binaryData) {
+        return newStringUtf8(encodeBase64(binaryData, true));
+    }
+    
+    /**
+     * Encodes binary data using a URL-safe variation of the base64 algorithm but does not chunk the output. The
+     * url-safe variation emits - and _ instead of + and / characters.
+     * 
+     * @param binaryData
+     *            binary data to encode
+     * @return byte[] containing Base64 characters in their UTF-8 representation.
+     * @since 1.4
+     */
+    public static byte[] encodeBase64URLSafe(byte[] binaryData) {
+        return encodeBase64(binaryData, false, true);
+    }
+
+    /**
+     * Encodes binary data using a URL-safe variation of the base64 algorithm but does not chunk the output. The
+     * url-safe variation emits - and _ instead of + and / characters.
+     *
+     * @param binaryData
+     *            binary data to encode
+     * @return String containing Base64 characters
+     * @since 1.4
+     */    
+    public static String encodeBase64URLSafeString(byte[] binaryData) {
+        return newStringUtf8(encodeBase64(binaryData, false, true));
+    }    
+
+    /**
+     * Encodes binary data using the base64 algorithm and chunks the encoded output into 76 character blocks
+     * 
+     * @param binaryData
+     *            binary data to encode
+     * @return Base64 characters chunked in 76 character blocks
+     */
+    public static byte[] encodeBase64Chunked(byte[] binaryData) {
+        return encodeBase64(binaryData, true);
+    }
+
+    /**
+     * Decodes an Object using the base64 algorithm. This method is provided in order to satisfy the requirements of the
+     * Decoder interface, and will throw a DecoderException if the supplied object is not of type byte[] or String.
+     * 
+     * @param pObject
+     *            Object to decode
+     * @return An object (of type byte[]) containing the binary data which corresponds to the byte[] or String supplied.
+     * @throws DecoderException
+     *             if the parameter supplied is not of type byte[]
+     */
+    public Object decode(Object pObject) {        
+        if (pObject instanceof byte[]) {
+            return decode((byte[]) pObject);
+        } else if (pObject instanceof String) {
+            return decode((String) pObject);
+        } else {
+            throw new RuntimeException("Parameter supplied to Base64 decode is not a byte[] or a String");
+        }
+    }
+
+    /**
+     * Decodes a String containing containing characters in the Base64 alphabet.
+     *
+     * @param pArray
+     *            A String containing Base64 character data
+     * @return a byte array containing binary data
+     * @since 1.4
+     */
+    public byte[] decode(String pArray) {
+        return decode(getBytesUtf8(pArray));
+    }
+
+    private byte[] getBytesUtf8(String pArray) {
+		try {
+			return pArray.getBytes("UTF8");
+		} catch (UnsupportedEncodingException e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+	/**
+     * Decodes a byte[] containing containing characters in the Base64 alphabet.
+     * 
+     * @param pArray
+     *            A byte array containing Base64 character data
+     * @return a byte array containing binary data
+     */
+    public byte[] decode(byte[] pArray) {
+        reset();
+        if (pArray == null || pArray.length == 0) {
+            return pArray;
+        }
+        long len = (pArray.length * 3) / 4;
+        byte[] buf = new byte[(int) len];
+        setInitialBuffer(buf, 0, buf.length);
+        decode(pArray, 0, pArray.length);
+        decode(pArray, 0, -1); // Notify decoder of EOF.
+
+        // Would be nice to just return buf (like we sometimes do in the encode
+        // logic), but we have no idea what the line-length was (could even be
+        // variable).  So we cannot determine ahead of time exactly how big an
+        // array is necessary.  Hence the need to construct a 2nd byte array to
+        // hold the final result:
+
+        byte[] result = new byte[pos];
+        readResults(result, 0, result.length);
+        return result;
+    }
+
+    /**
+     * Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.
+     * 
+     * @param binaryData
+     *            Array containing binary data to encode.
+     * @param isChunked
+     *            if <code>true</code> this encoder will chunk the base64 output into 76 character blocks
+     * @return Base64-encoded data.
+     * @throws IllegalArgumentException
+     *             Thrown when the input array needs an output array bigger than {@link Integer#MAX_VALUE}
+     */
+    public static byte[] encodeBase64(byte[] binaryData, boolean isChunked) {
+        return encodeBase64(binaryData, isChunked, false);
+    }
+
+    /**
+     * Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.
+     * 
+     * @param binaryData
+     *            Array containing binary data to encode.
+     * @param isChunked
+     *            if <code>true</code> this encoder will chunk the base64 output into 76 character blocks
+     * @param urlSafe
+     *            if <code>true</code> this encoder will emit - and _ instead of the usual + and / characters.
+     * @return Base64-encoded data.
+     * @throws IllegalArgumentException
+     *             Thrown when the input array needs an output array bigger than {@link Integer#MAX_VALUE}
+     * @since 1.4
+     */
+    public static byte[] encodeBase64(byte[] binaryData, boolean isChunked, boolean urlSafe) {
+        return encodeBase64(binaryData, isChunked, urlSafe, Integer.MAX_VALUE);
+    }
+
+    /**
+     * Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.
+     * 
+     * @param binaryData
+     *            Array containing binary data to encode.
+     * @param isChunked
+     *            if <code>true</code> this encoder will chunk the base64 output into 76 character blocks
+     * @param urlSafe
+     *            if <code>true</code> this encoder will emit - and _ instead of the usual + and / characters.
+     * @param maxResultSize
+     *            The maximum result size to accept.
+     * @return Base64-encoded data.
+     * @throws IllegalArgumentException
+     *             Thrown when the input array needs an output array bigger than maxResultSize
+     * @since 1.4
+     */
+    public static byte[] encodeBase64(byte[] binaryData, boolean isChunked, boolean urlSafe, int maxResultSize) {
+        if (binaryData == null || binaryData.length == 0) {
+            return binaryData;
+        }
+
+        long len = getEncodeLength(binaryData, CHUNK_SIZE, CHUNK_SEPARATOR);
+        if (len > maxResultSize) {
+            throw new IllegalArgumentException("Input array too big, the output array would be bigger (" +
+                len +
+                ") than the specified maxium size of " +
+                maxResultSize);
+        }
+                
+        Base64 b64 = isChunked ? new Base64(urlSafe) : new Base64(0, CHUNK_SEPARATOR, urlSafe);
+        return b64.encode(binaryData);
+    }
+
+    /**
+     * Decodes a Base64 String into octets
+     *
+     * @param base64String
+     *            String containing Base64 data
+     * @return Array containing decoded data.
+     * @since 1.4
+     */
+    public static byte[] decodeBase64(String base64String) {
+        return new Base64().decode(base64String);
+    }
+
+    /**
+     * Decodes Base64 data into octets
+     * 
+     * @param base64Data
+     *            Byte array containing Base64 data
+     * @return Array containing decoded data.
+     */
+    public static byte[] decodeBase64(byte[] base64Data) {
+        return new Base64().decode(base64Data);
+    }
+
+   
+
+    /**
+     * Checks if a byte value is whitespace or not.
+     * 
+     * @param byteToCheck
+     *            the byte to check
+     * @return true if byte is whitespace, false otherwise
+     */
+    private static boolean isWhiteSpace(byte byteToCheck) {
+        switch (byteToCheck) {
+            case ' ' :
+            case '\n' :
+            case '\r' :
+            case '\t' :
+                return true;
+            default :
+                return false;
+        }
+    }
+
+    // Implementation of the Encoder Interface
+
+    /**
+     * Encodes an Object using the base64 algorithm. This method is provided in order to satisfy the requirements of the
+     * Encoder interface, and will throw an EncoderException if the supplied object is not of type byte[].
+     * 
+     * @param pObject
+     *            Object to encode
+     * @return An object (of type byte[]) containing the base64 encoded data which corresponds to the byte[] supplied.
+     * @throws EncoderException
+     *             if the parameter supplied is not of type byte[]
+     */
+    public Object encode(Object pObject)  {
+        if (!(pObject instanceof byte[])) {
+            throw new RuntimeException("Parameter supplied to Base64 encode is not a byte[]");
+        }
+        return encode((byte[]) pObject);
+    }
+
+    /**
+     * Encodes a byte[] containing binary data, into a String containing characters in the Base64 alphabet.
+     *
+     * @param pArray
+     *            a byte array containing binary data
+     * @return A String containing only Base64 character data
+     * @since 1.4
+     */    
+    public String encodeToString(byte[] pArray) {
+        return newStringUtf8(encode(pArray));
+    }
+
+    private static String newStringUtf8(byte[] encode) {
+		String str = null;
+		try {
+			str = new String(encode, "UTF8");
+		} catch (UnsupportedEncodingException ue) {
+			throw new RuntimeException(ue);
+		}
+		return str;
+	}
+
+	/**
+     * Encodes a byte[] containing binary data, into a byte[] containing characters in the Base64 alphabet.
+     * 
+     * @param pArray
+     *            a byte array containing binary data
+     * @return A byte array containing only Base64 character data
+     */
+    public byte[] encode(byte[] pArray) {
+        reset();        
+        if (pArray == null || pArray.length == 0) {
+            return pArray;
+        }
+        long len = getEncodeLength(pArray, lineLength, lineSeparator);
+        byte[] buf = new byte[(int) len];
+        setInitialBuffer(buf, 0, buf.length);
+        encode(pArray, 0, pArray.length);
+        encode(pArray, 0, -1); // Notify encoder of EOF.
+        // Encoder might have resized, even though it was unnecessary.
+        if (buffer != buf) {
+            readResults(buf, 0, buf.length);
+        }
+        // In URL-SAFE mode we skip the padding characters, so sometimes our
+        // final length is a bit smaller.
+        if (isUrlSafe() && pos < buf.length) {
+            byte[] smallerBuf = new byte[pos];
+            System.arraycopy(buf, 0, smallerBuf, 0, pos);
+            buf = smallerBuf;
+        }
+        return buf;        
+    }
+
+    /**
+     * Pre-calculates the amount of space needed to base64-encode the supplied array.
+     *
+     * @param pArray byte[] array which will later be encoded
+     * @param chunkSize line-length of the output (<= 0 means no chunking) between each
+     *        chunkSeparator (e.g. CRLF).
+     * @param chunkSeparator the sequence of bytes used to separate chunks of output (e.g. CRLF).
+     *
+     * @return amount of space needed to encoded the supplied array.  Returns
+     *         a long since a max-len array will require Integer.MAX_VALUE + 33%.
+     */
+    private static long getEncodeLength(byte[] pArray, int chunkSize, byte[] chunkSeparator) {
+        // base64 always encodes to multiples of 4.
+        chunkSize = (chunkSize / 4) * 4;
+
+        long len = (pArray.length * 4) / 3;
+        long mod = len % 4;
+        if (mod != 0) {
+            len += 4 - mod;
+        }
+        if (chunkSize > 0) {
+            boolean lenChunksPerfectly = len % chunkSize == 0;
+            len += (len / chunkSize) * chunkSeparator.length;
+            if (!lenChunksPerfectly) {
+                len += chunkSeparator.length;
+            }
+        }
+        return len;
+    }
+
+    // Implementation of integer encoding used for crypto
+    /**
+     * Decodes a byte64-encoded integer according to crypto standards such as W3C's XML-Signature
+     * 
+     * @param pArray
+     *            a byte array containing base64 character data
+     * @return A BigInteger
+     * @since 1.4
+     */
+    public static BigInteger decodeInteger(byte[] pArray) {
+        return new BigInteger(1, decodeBase64(pArray));
+    }
+
+    /**
+     * Encodes to a byte64-encoded integer according to crypto standards such as W3C's XML-Signature
+     * 
+     * @param bigInt
+     *            a BigInteger
+     * @return A byte array containing base64 character data
+     * @throws NullPointerException
+     *             if null is passed in
+     * @since 1.4
+     */
+    public static byte[] encodeInteger(BigInteger bigInt) {
+        if (bigInt == null) {
+            throw new NullPointerException("encodeInteger called with null parameter");
+        }
+        return encodeBase64(toIntegerBytes(bigInt), false);
+    }
+
+    /**
+     * Returns a byte-array representation of a <code>BigInteger</code> without sign bit.
+     * 
+     * @param bigInt
+     *            <code>BigInteger</code> to be converted
+     * @return a byte array representation of the BigInteger parameter
+     */
+    static byte[] toIntegerBytes(BigInteger bigInt) {
+        int bitlen = bigInt.bitLength();
+        // round bitlen
+        bitlen = ((bitlen + 7) >> 3) << 3;
+        byte[] bigBytes = bigInt.toByteArray();
+
+        if (((bigInt.bitLength() % 8) != 0) && (((bigInt.bitLength() / 8) + 1) == (bitlen / 8))) {
+            return bigBytes;
+        }
+        // set up params for copying everything but sign bit
+        int startSrc = 0;
+        int len = bigBytes.length;
+
+        // if bigInt is exactly byte-aligned, just skip signbit in copy
+        if ((bigInt.bitLength() % 8) == 0) {
+            startSrc = 1;
+            len--;
+        }
+        int startDst = bitlen / 8 - len; // to pad w/ nulls as per spec
+        byte[] resizedBytes = new byte[bitlen / 8];
+        System.arraycopy(bigBytes, startSrc, resizedBytes, startDst, len);
+        return resizedBytes;
+    }
+
+    /**
+     * Resets this Base64 object to its initial newly constructed state.
+     */
+    private void reset() {
+        buffer = null;
+        pos = 0;
+        readPos = 0;
+        currentLinePos = 0;
+        modulus = 0;
+        eof = false;
+    }
+
+}



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