src/org/apache/commons/codec/binary/Base64.java - platform/external/apache-http.git - Git at Google

 /*
  * Copyright 2001-2004 The Apache Software Foundation.
  *
  * Licensed 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.codec.binary;

 import org.apache.commons.codec.BinaryDecoder;
 import org.apache.commons.codec.BinaryEncoder;
 import org.apache.commons.codec.DecoderException;
 import org.apache.commons.codec.EncoderException;

 /**
  * 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>
  *
  * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a>
  * @author Apache Software Foundation
  * @since 1.0-dev
  * @version $Id: Base64.java,v 1.20 2004/05/24 00:21:24 ggregory Exp $
  *
  * @deprecated Please use {@link java.net.URL#openConnection} instead.
  *     Please visit <a href="http://android-developers.blogspot.com/2011/09/androids-http-clients.html">this webpage</a>
  *     for further details.
  */
 @Deprecated
 public class Base64 implements BinaryEncoder, BinaryDecoder {

     /**
      * 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.
      *
      * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 2.1</a>
      */
     static final byte[] CHUNK_SEPARATOR = "\r\n".getBytes();

     /**
      * The base length.
      */
     static final int BASELENGTH = 255;

     /**
      * Lookup length.
      */
     static final int LOOKUPLENGTH = 64;

     /**
      * Used to calculate the number of bits in a byte.
      */
     static final int EIGHTBIT = 8;

     /**
      * Used when encoding something which has fewer than 24 bits.
      */
     static final int SIXTEENBIT = 16;

     /**
      * Used to determine how many bits data contains.
      */
     static final int TWENTYFOURBITGROUP = 24;

     /**
      * Used to get the number of Quadruples.
      */
     static final int FOURBYTE = 4;

     /**
      * Used to test the sign of a byte.
      */
     static final int SIGN = -128;

     /**
      * Byte used to pad output.
      */
     static final byte PAD = (byte) '=';

     // Create arrays to hold the base64 characters and a
     // lookup for base64 chars
     private static byte[] base64Alphabet = new byte[BASELENGTH];
     private static byte[] lookUpBase64Alphabet = new byte[LOOKUPLENGTH];

     // Populating the lookup and character arrays
     static {
         for (int i = 0; i < BASELENGTH; i++) {
             base64Alphabet[i] = (byte) -1;
         }
         for (int i = 'Z'; i >= 'A'; i--) {
             base64Alphabet[i] = (byte) (i - 'A');
         }
         for (int i = 'z'; i >= 'a'; i--) {
             base64Alphabet[i] = (byte) (i - 'a' + 26);
         }
         for (int i = '9'; i >= '0'; i--) {
             base64Alphabet[i] = (byte) (i - '0' + 52);
         }

         base64Alphabet['+'] = 62;
         base64Alphabet['/'] = 63;

         for (int i = 0; i <= 25; i++) {
             lookUpBase64Alphabet[i] = (byte) ('A' + i);
         }

         for (int i = 26, j = 0; i <= 51; i++, j++) {
             lookUpBase64Alphabet[i] = (byte) ('a' + j);
         }

         for (int i = 52, j = 0; i <= 61; i++, j++) {
             lookUpBase64Alphabet[i] = (byte) ('0' + j);
         }

         lookUpBase64Alphabet[62] = (byte) '+';
         lookUpBase64Alphabet[63] = (byte) '/';
     }

     private static boolean isBase64(byte octect) {
         if (octect == PAD) {
             return true;
         } else if (base64Alphabet[octect] == -1) {
             return false;
         } else {
             return true;
         }
     }

     /**
      * Tests a given byte array to see if it contains
      * only valid characters within the Base64 alphabet.
      *
      * @param arrayOctect byte array to test
      * @return true if all bytes are valid characters in the Base64
      *         alphabet or if the byte array is empty; false, otherwise
      */
     public static boolean isArrayByteBase64(byte[] arrayOctect) {

         arrayOctect = discardWhitespace(arrayOctect);

         int length = arrayOctect.length;
         if (length == 0) {
             // shouldn't a 0 length array be valid base64 data?
             // return false;
             return true;
         }
         for (int i = 0; i < length; i++) {
             if (!isBase64(arrayOctect[i])) {
                 return false;
             }
         }
         return true;
     }

     /**
      * Encodes binary data using the base64 algorithm but
      * does not chunk the output.
      *
      * @param binaryData binary data to encode
      * @return Base64 characters
      */
     public static byte[] encodeBase64(byte[] binaryData) {
         return encodeBase64(binaryData, false);
     }

     /**
      * 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[].
      *
      * @param pObject Object to decode
      * @return An object (of type byte[]) containing the
      *         binary data which corresponds to the byte[] supplied.
      * @throws DecoderException if the parameter supplied is not
      *                          of type byte[]
      */
     public Object decode(Object pObject) throws DecoderException {
         if (!(pObject instanceof byte[])) {
             throw new DecoderException("Parameter supplied to Base64 decode is not a byte[]");
         }
         return decode((byte[]) pObject);
     }

     /**
      * 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) {
         return decodeBase64(pArray);
     }

     /**
      * 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 isChunked is true this encoder will chunk
      *                  the base64 output into 76 character blocks
      * @return Base64-encoded data.
      */
     public static byte[] encodeBase64(byte[] binaryData, boolean isChunked) {
         int lengthDataBits = binaryData.length * EIGHTBIT;
         int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;
         int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP;
         byte encodedData[] = null;
         int encodedDataLength = 0;
         int nbrChunks = 0;

         if (fewerThan24bits != 0) {
             //data not divisible by 24 bit
             encodedDataLength = (numberTriplets + 1) * 4;
         } else {
             // 16 or 8 bit
             encodedDataLength = numberTriplets * 4;
         }

         // If the output is to be "chunked" into 76 character sections,
         // for compliance with RFC 2045 MIME, then it is important to
         // allow for extra length to account for the separator(s)
         if (isChunked) {

             nbrChunks =
                 (CHUNK_SEPARATOR.length == 0 ? 0 : (int) Math.ceil((float) encodedDataLength / CHUNK_SIZE));
             encodedDataLength += nbrChunks * CHUNK_SEPARATOR.length;
         }

         encodedData = new byte[encodedDataLength];

         byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;

         int encodedIndex = 0;
         int dataIndex = 0;
         int i = 0;
         int nextSeparatorIndex = CHUNK_SIZE;
         int chunksSoFar = 0;

         //log.debug("number of triplets = " + numberTriplets);
         for (i = 0; i < numberTriplets; i++) {
             dataIndex = i * 3;
             b1 = binaryData[dataIndex];
             b2 = binaryData[dataIndex + 1];
             b3 = binaryData[dataIndex + 2];

             //log.debug("b1= " + b1 +", b2= " + b2 + ", b3= " + b3);

             l = (byte) (b2 & 0x0f);
             k = (byte) (b1 & 0x03);

             byte val1 =
                 ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
             byte val2 =
                 ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);
             byte val3 =
                 ((b3 & SIGN) == 0) ? (byte) (b3 >> 6) : (byte) ((b3) >> 6 ^ 0xfc);

             encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
             //log.debug( "val2 = " + val2 );
             //log.debug( "k4   = " + (k<<4) );
             //log.debug(  "vak  = " + (val2 | (k<<4)) );
             encodedData[encodedIndex + 1] =
                 lookUpBase64Alphabet[val2 | (k << 4)];
             encodedData[encodedIndex + 2] =
                 lookUpBase64Alphabet[(l << 2) | val3];
             encodedData[encodedIndex + 3] = lookUpBase64Alphabet[b3 & 0x3f];

             encodedIndex += 4;

             // If we are chunking, let's put a chunk separator down.
             if (isChunked) {
                 // this assumes that CHUNK_SIZE % 4 == 0
                 if (encodedIndex == nextSeparatorIndex) {
                     System.arraycopy(
                         CHUNK_SEPARATOR,
                         0,
                         encodedData,
                         encodedIndex,
                         CHUNK_SEPARATOR.length);
                     chunksSoFar++;
                     nextSeparatorIndex =
                         (CHUNK_SIZE * (chunksSoFar + 1)) +
                         (chunksSoFar * CHUNK_SEPARATOR.length);
                     encodedIndex += CHUNK_SEPARATOR.length;
                 }
             }
         }

         // form integral number of 6-bit groups
         dataIndex = i * 3;

         if (fewerThan24bits == EIGHTBIT) {
             b1 = binaryData[dataIndex];
             k = (byte) (b1 & 0x03);
             //log.debug("b1=" + b1);
             //log.debug("b1<<2 = " + (b1>>2) );
             byte val1 =
                 ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
             encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
             encodedData[encodedIndex + 1] = lookUpBase64Alphabet[k << 4];
             encodedData[encodedIndex + 2] = PAD;
             encodedData[encodedIndex + 3] = PAD;
         } else if (fewerThan24bits == SIXTEENBIT) {

             b1 = binaryData[dataIndex];
             b2 = binaryData[dataIndex + 1];
             l = (byte) (b2 & 0x0f);
             k = (byte) (b1 & 0x03);

             byte val1 =
                 ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
             byte val2 =
                 ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);

             encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
             encodedData[encodedIndex + 1] =
                 lookUpBase64Alphabet[val2 | (k << 4)];
             encodedData[encodedIndex + 2] = lookUpBase64Alphabet[l << 2];
             encodedData[encodedIndex + 3] = PAD;
         }

         if (isChunked) {
             // we also add a separator to the end of the final chunk.
             if (chunksSoFar < nbrChunks) {
                 System.arraycopy(
                     CHUNK_SEPARATOR,
                     0,
                     encodedData,
                     encodedDataLength - CHUNK_SEPARATOR.length,
                     CHUNK_SEPARATOR.length);
             }
         }

         return encodedData;
     }

     /**
      * Decodes Base64 data into octects
      *
      * @param base64Data Byte array containing Base64 data
      * @return Array containing decoded data.
      */
     public static byte[] decodeBase64(byte[] base64Data) {
         // RFC 2045 requires that we discard ALL non-Base64 characters
         base64Data = discardNonBase64(base64Data);

         // handle the edge case, so we don't have to worry about it later
         if (base64Data.length == 0) {
             return new byte[0];
         }

         int numberQuadruple = base64Data.length / FOURBYTE;
         byte decodedData[] = null;
         byte b1 = 0, b2 = 0, b3 = 0, b4 = 0, marker0 = 0, marker1 = 0;

         // Throw away anything not in base64Data

         int encodedIndex = 0;
         int dataIndex = 0;
         {
             // this sizes the output array properly - rlw
             int lastData = base64Data.length;
             // ignore the '=' padding
             while (base64Data[lastData - 1] == PAD) {
                 if (--lastData == 0) {
                     return new byte[0];
                 }
             }
             decodedData = new byte[lastData - numberQuadruple];
         }

         for (int i = 0; i < numberQuadruple; i++) {
             dataIndex = i * 4;
             marker0 = base64Data[dataIndex + 2];
             marker1 = base64Data[dataIndex + 3];

             b1 = base64Alphabet[base64Data[dataIndex]];
             b2 = base64Alphabet[base64Data[dataIndex + 1]];

             if (marker0 != PAD && marker1 != PAD) {
                 //No PAD e.g 3cQl
                 b3 = base64Alphabet[marker0];
                 b4 = base64Alphabet[marker1];

                 decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);
                 decodedData[encodedIndex + 1] =
                     (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
                 decodedData[encodedIndex + 2] = (byte) (b3 << 6 | b4);
             } else if (marker0 == PAD) {
                 //Two PAD e.g. 3c[Pad][Pad]
                 decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);
             } else if (marker1 == PAD) {
                 //One PAD e.g. 3cQ[Pad]
                 b3 = base64Alphabet[marker0];

                 decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);
                 decodedData[encodedIndex + 1] =
                     (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
             }
             encodedIndex += 3;
         }
         return decodedData;
     }

     /**
      * Discards any whitespace from a base-64 encoded block.
      *
      * @param data The base-64 encoded data to discard the whitespace
      * from.
      * @return The data, less whitespace (see RFC 2045).
      */
     static byte[] discardWhitespace(byte[] data) {
         byte groomedData[] = new byte[data.length];
         int bytesCopied = 0;

         for (int i = 0; i < data.length; i++) {
             switch (data[i]) {
             case (byte) ' ' :
             case (byte) '\n' :
             case (byte) '\r' :
             case (byte) '\t' :
                     break;
             default:
                     groomedData[bytesCopied++] = data[i];
             }
         }

         byte packedData[] = new byte[bytesCopied];

         System.arraycopy(groomedData, 0, packedData, 0, bytesCopied);

         return packedData;
     }

     /**
      * Discards any characters outside of the base64 alphabet, per
      * the requirements on page 25 of RFC 2045 - "Any characters
      * outside of the base64 alphabet are to be ignored in base64
      * encoded data."
      *
      * @param data The base-64 encoded data to groom
      * @return The data, less non-base64 characters (see RFC 2045).
      */
     static byte[] discardNonBase64(byte[] data) {
         byte groomedData[] = new byte[data.length];
         int bytesCopied = 0;

         for (int i = 0; i < data.length; i++) {
             if (isBase64(data[i])) {
                 groomedData[bytesCopied++] = data[i];
             }
         }

         byte packedData[] = new byte[bytesCopied];

         System.arraycopy(groomedData, 0, packedData, 0, bytesCopied);

         return packedData;
     }


     // 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) throws EncoderException {
         if (!(pObject instanceof byte[])) {
             throw new EncoderException(
                 "Parameter supplied to Base64 encode is not a byte[]");
         }
         return encode((byte[]) pObject);
     }

     /**
      * 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) {
         return encodeBase64(pArray, false);
     }

 }
	/*
	* Copyright 2001-2004 The Apache Software Foundation.
	*
	* Licensed 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.codec.binary;

	import org.apache.commons.codec.BinaryDecoder;
	import org.apache.commons.codec.BinaryEncoder;
	import org.apache.commons.codec.DecoderException;
	import org.apache.commons.codec.EncoderException;

	/**
	* 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>
	*
	* @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a>
	* @author Apache Software Foundation
	* @since 1.0-dev
	* @version $Id: Base64.java,v 1.20 2004/05/24 00:21:24 ggregory Exp $
	*
	* @deprecated Please use {@link java.net.URL#openConnection} instead.
	* Please visit <a href="http://android-developers.blogspot.com/2011/09/androids-http-clients.html">this webpage</a>
	* for further details.
	*/
	@Deprecated
	public class Base64 implements BinaryEncoder, BinaryDecoder {

	/**
	* 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.
	*
	* @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 2.1</a>
	*/
	static final byte[] CHUNK_SEPARATOR = "\r\n".getBytes();

	/**
	* The base length.
	*/
	static final int BASELENGTH = 255;

	/**
	* Lookup length.
	*/
	static final int LOOKUPLENGTH = 64;

	/**
	* Used to calculate the number of bits in a byte.
	*/
	static final int EIGHTBIT = 8;

	/**
	* Used when encoding something which has fewer than 24 bits.
	*/
	static final int SIXTEENBIT = 16;

	/**
	* Used to determine how many bits data contains.
	*/
	static final int TWENTYFOURBITGROUP = 24;

	/**
	* Used to get the number of Quadruples.
	*/
	static final int FOURBYTE = 4;

	/**
	* Used to test the sign of a byte.
	*/
	static final int SIGN = -128;

	/**
	* Byte used to pad output.
	*/
	static final byte PAD = (byte) '=';

	// Create arrays to hold the base64 characters and a
	// lookup for base64 chars
	private static byte[] base64Alphabet = new byte[BASELENGTH];
	private static byte[] lookUpBase64Alphabet = new byte[LOOKUPLENGTH];

	// Populating the lookup and character arrays
	static {
	for (int i = 0; i < BASELENGTH; i++) {
	base64Alphabet[i] = (byte) -1;
	}
	for (int i = 'Z'; i >= 'A'; i--) {
	base64Alphabet[i] = (byte) (i - 'A');
	}
	for (int i = 'z'; i >= 'a'; i--) {
	base64Alphabet[i] = (byte) (i - 'a' + 26);
	}
	for (int i = '9'; i >= '0'; i--) {
	base64Alphabet[i] = (byte) (i - '0' + 52);
	}

	base64Alphabet['+'] = 62;
	base64Alphabet['/'] = 63;

	for (int i = 0; i <= 25; i++) {
	lookUpBase64Alphabet[i] = (byte) ('A' + i);
	}

	for (int i = 26, j = 0; i <= 51; i++, j++) {
	lookUpBase64Alphabet[i] = (byte) ('a' + j);
	}

	for (int i = 52, j = 0; i <= 61; i++, j++) {
	lookUpBase64Alphabet[i] = (byte) ('0' + j);
	}

	lookUpBase64Alphabet[62] = (byte) '+';
	lookUpBase64Alphabet[63] = (byte) '/';
	}

	private static boolean isBase64(byte octect) {
	if (octect == PAD) {
	return true;
	} else if (base64Alphabet[octect] == -1) {
	return false;
	} else {
	return true;
	}
	}

	/**
	* Tests a given byte array to see if it contains
	* only valid characters within the Base64 alphabet.
	*
	* @param arrayOctect byte array to test
	* @return true if all bytes are valid characters in the Base64
	* alphabet or if the byte array is empty; false, otherwise
	*/
	public static boolean isArrayByteBase64(byte[] arrayOctect) {

	arrayOctect = discardWhitespace(arrayOctect);

	int length = arrayOctect.length;
	if (length == 0) {
	// shouldn't a 0 length array be valid base64 data?
	// return false;
	return true;
	}
	for (int i = 0; i < length; i++) {
	if (!isBase64(arrayOctect[i])) {
	return false;
	}
	}
	return true;
	}

	/**
	* Encodes binary data using the base64 algorithm but
	* does not chunk the output.
	*
	* @param binaryData binary data to encode
	* @return Base64 characters
	*/
	public static byte[] encodeBase64(byte[] binaryData) {
	return encodeBase64(binaryData, false);
	}

	/**
	* 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[].
	*
	* @param pObject Object to decode
	* @return An object (of type byte[]) containing the
	* binary data which corresponds to the byte[] supplied.
	* @throws DecoderException if the parameter supplied is not
	* of type byte[]
	*/
	public Object decode(Object pObject) throws DecoderException {
	if (!(pObject instanceof byte[])) {
	throw new DecoderException("Parameter supplied to Base64 decode is not a byte[]");
	}
	return decode((byte[]) pObject);
	}

	/**
	* 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) {
	return decodeBase64(pArray);
	}

	/**
	* 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 isChunked is true this encoder will chunk
	* the base64 output into 76 character blocks
	* @return Base64-encoded data.
	*/
	public static byte[] encodeBase64(byte[] binaryData, boolean isChunked) {
	int lengthDataBits = binaryData.length * EIGHTBIT;
	int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;
	int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP;
	byte encodedData[] = null;
	int encodedDataLength = 0;
	int nbrChunks = 0;

	if (fewerThan24bits != 0) {
	//data not divisible by 24 bit
	encodedDataLength = (numberTriplets + 1) * 4;
	} else {
	// 16 or 8 bit
	encodedDataLength = numberTriplets * 4;
	}

	// If the output is to be "chunked" into 76 character sections,
	// for compliance with RFC 2045 MIME, then it is important to
	// allow for extra length to account for the separator(s)
	if (isChunked) {

	nbrChunks =
	(CHUNK_SEPARATOR.length == 0 ? 0 : (int) Math.ceil((float) encodedDataLength / CHUNK_SIZE));
	encodedDataLength += nbrChunks * CHUNK_SEPARATOR.length;
	}

	encodedData = new byte[encodedDataLength];

	byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;

	int encodedIndex = 0;
	int dataIndex = 0;
	int i = 0;
	int nextSeparatorIndex = CHUNK_SIZE;
	int chunksSoFar = 0;

	//log.debug("number of triplets = " + numberTriplets);
	for (i = 0; i < numberTriplets; i++) {
	dataIndex = i * 3;
	b1 = binaryData[dataIndex];
	b2 = binaryData[dataIndex + 1];
	b3 = binaryData[dataIndex + 2];

	//log.debug("b1= " + b1 +", b2= " + b2 + ", b3= " + b3);

	l = (byte) (b2 & 0x0f);
	k = (byte) (b1 & 0x03);

	byte val1 =
	((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
	byte val2 =
	((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);
	byte val3 =
	((b3 & SIGN) == 0) ? (byte) (b3 >> 6) : (byte) ((b3) >> 6 ^ 0xfc);

	encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
	//log.debug( "val2 = " + val2 );
	//log.debug( "k4 = " + (k<<4) );
	//log.debug( "vak = " + (val2 \| (k<<4)) );
	encodedData[encodedIndex + 1] =
	lookUpBase64Alphabet[val2 \| (k << 4)];
	encodedData[encodedIndex + 2] =
	lookUpBase64Alphabet[(l << 2) \| val3];
	encodedData[encodedIndex + 3] = lookUpBase64Alphabet[b3 & 0x3f];

	encodedIndex += 4;

	// If we are chunking, let's put a chunk separator down.
	if (isChunked) {
	// this assumes that CHUNK_SIZE % 4 == 0
	if (encodedIndex == nextSeparatorIndex) {
	System.arraycopy(
	CHUNK_SEPARATOR,
	0,
	encodedData,
	encodedIndex,
	CHUNK_SEPARATOR.length);
	chunksSoFar++;
	nextSeparatorIndex =
	(CHUNK_SIZE * (chunksSoFar + 1)) +
	(chunksSoFar * CHUNK_SEPARATOR.length);
	encodedIndex += CHUNK_SEPARATOR.length;
	}
	}
	}

	// form integral number of 6-bit groups
	dataIndex = i * 3;

	if (fewerThan24bits == EIGHTBIT) {
	b1 = binaryData[dataIndex];
	k = (byte) (b1 & 0x03);
	//log.debug("b1=" + b1);
	//log.debug("b1<<2 = " + (b1>>2) );
	byte val1 =
	((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
	encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
	encodedData[encodedIndex + 1] = lookUpBase64Alphabet[k << 4];
	encodedData[encodedIndex + 2] = PAD;
	encodedData[encodedIndex + 3] = PAD;
	} else if (fewerThan24bits == SIXTEENBIT) {

	b1 = binaryData[dataIndex];
	b2 = binaryData[dataIndex + 1];
	l = (byte) (b2 & 0x0f);
	k = (byte) (b1 & 0x03);

	byte val1 =
	((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
	byte val2 =
	((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);

	encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
	encodedData[encodedIndex + 1] =
	lookUpBase64Alphabet[val2 \| (k << 4)];
	encodedData[encodedIndex + 2] = lookUpBase64Alphabet[l << 2];
	encodedData[encodedIndex + 3] = PAD;
	}

	if (isChunked) {
	// we also add a separator to the end of the final chunk.
	if (chunksSoFar < nbrChunks) {
	System.arraycopy(
	CHUNK_SEPARATOR,
	0,
	encodedData,
	encodedDataLength - CHUNK_SEPARATOR.length,
	CHUNK_SEPARATOR.length);
	}
	}

	return encodedData;
	}

	/**
	* Decodes Base64 data into octects
	*
	* @param base64Data Byte array containing Base64 data
	* @return Array containing decoded data.
	*/
	public static byte[] decodeBase64(byte[] base64Data) {
	// RFC 2045 requires that we discard ALL non-Base64 characters
	base64Data = discardNonBase64(base64Data);

	// handle the edge case, so we don't have to worry about it later
	if (base64Data.length == 0) {
	return new byte[0];
	}

	int numberQuadruple = base64Data.length / FOURBYTE;
	byte decodedData[] = null;
	byte b1 = 0, b2 = 0, b3 = 0, b4 = 0, marker0 = 0, marker1 = 0;

	// Throw away anything not in base64Data

	int encodedIndex = 0;
	int dataIndex = 0;
	{
	// this sizes the output array properly - rlw
	int lastData = base64Data.length;
	// ignore the '=' padding
	while (base64Data[lastData - 1] == PAD) {
	if (--lastData == 0) {
	return new byte[0];
	}
	}
	decodedData = new byte[lastData - numberQuadruple];
	}

	for (int i = 0; i < numberQuadruple; i++) {
	dataIndex = i * 4;
	marker0 = base64Data[dataIndex + 2];
	marker1 = base64Data[dataIndex + 3];

	b1 = base64Alphabet[base64Data[dataIndex]];
	b2 = base64Alphabet[base64Data[dataIndex + 1]];

	if (marker0 != PAD && marker1 != PAD) {
	//No PAD e.g 3cQl
	b3 = base64Alphabet[marker0];
	b4 = base64Alphabet[marker1];

	decodedData[encodedIndex] = (byte) (b1 << 2 \| b2 >> 4);
	decodedData[encodedIndex + 1] =
	(byte) (((b2 & 0xf) << 4) \| ((b3 >> 2) & 0xf));
	decodedData[encodedIndex + 2] = (byte) (b3 << 6 \| b4);
	} else if (marker0 == PAD) {
	//Two PAD e.g. 3c[Pad][Pad]
	decodedData[encodedIndex] = (byte) (b1 << 2 \| b2 >> 4);
	} else if (marker1 == PAD) {
	//One PAD e.g. 3cQ[Pad]
	b3 = base64Alphabet[marker0];

	decodedData[encodedIndex] = (byte) (b1 << 2 \| b2 >> 4);
	decodedData[encodedIndex + 1] =
	(byte) (((b2 & 0xf) << 4) \| ((b3 >> 2) & 0xf));
	}
	encodedIndex += 3;
	}
	return decodedData;
	}

	/**
	* Discards any whitespace from a base-64 encoded block.
	*
	* @param data The base-64 encoded data to discard the whitespace
	* from.
	* @return The data, less whitespace (see RFC 2045).
	*/
	static byte[] discardWhitespace(byte[] data) {
	byte groomedData[] = new byte[data.length];
	int bytesCopied = 0;

	for (int i = 0; i < data.length; i++) {
	switch (data[i]) {
	case (byte) ' ' :
	case (byte) '\n' :
	case (byte) '\r' :
	case (byte) '\t' :
	break;
	default:
	groomedData[bytesCopied++] = data[i];
	}
	}

	byte packedData[] = new byte[bytesCopied];

	System.arraycopy(groomedData, 0, packedData, 0, bytesCopied);

	return packedData;
	}

	/**
	* Discards any characters outside of the base64 alphabet, per
	* the requirements on page 25 of RFC 2045 - "Any characters
	* outside of the base64 alphabet are to be ignored in base64
	* encoded data."
	*
	* @param data The base-64 encoded data to groom
	* @return The data, less non-base64 characters (see RFC 2045).
	*/
	static byte[] discardNonBase64(byte[] data) {
	byte groomedData[] = new byte[data.length];
	int bytesCopied = 0;

	for (int i = 0; i < data.length; i++) {
	if (isBase64(data[i])) {
	groomedData[bytesCopied++] = data[i];
	}
	}

	byte packedData[] = new byte[bytesCopied];

	System.arraycopy(groomedData, 0, packedData, 0, bytesCopied);

	return packedData;
	}


	// 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) throws EncoderException {
	if (!(pObject instanceof byte[])) {
	throw new EncoderException(
	"Parameter supplied to Base64 encode is not a byte[]");
	}
	return encode((byte[]) pObject);
	}

	/**
	* 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) {
	return encodeBase64(pArray, false);
	}

	}