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Posted to dev@commons.apache.org by gg...@apache.org on 2003/07/20 21:09:03 UTC
cvs commit: jakarta-commons/codec/src/java/org/apache/commons/codec/base64 Base64.java
ggregory 2003/07/20 12:09:03
Modified: codec/src/java/org/apache/commons/codec/base64 Base64.java
Log:
Javadoc typo.
Revision Changes Path
1.4 +455 -455 jakarta-commons/codec/src/java/org/apache/commons/codec/base64/Base64.java
Index: Base64.java
===================================================================
RCS file: /home/cvs/jakarta-commons/codec/src/java/org/apache/commons/codec/base64/Base64.java,v
retrieving revision 1.3
retrieving revision 1.4
diff -u -r1.3 -r1.4
--- Base64.java 18 Jun 2003 18:43:56 -0000 1.3
+++ Base64.java 20 Jul 2003 19:09:02 -0000 1.4
@@ -1,455 +1,455 @@
-/*
- * ====================================================================
- *
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 2003 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution, if
- * any, must include the following acknowlegement:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowlegement may appear in the software itself,
- * if and wherever such third-party acknowlegements normally appear.
- *
- * 4. The names "The Jakarta Project", "HttpClient", and "Apache Software
- * Foundation" must not be used to endorse or promote products derived
- * from this software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache"
- * nor may "Apache" appear in their names without prior written
- * permission of the Apache Group.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- *
- */
-
-package org.apache.commons.codec.base64;
-
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.io.OutputStreamWriter;
-import java.io.UnsupportedEncodingException;
-
-/**
- * <p>Base64 encoder and decoder.</p>
- * <p>
- * This class provides encoding/decoding methods for
- * the Base64 encoding as defined by RFC 2045,
- * N. Freed and N. Borenstein.
-y * RFC 2045: Multipurpose Internet Mail Extensions (MIME)
- * Part One: Format of Internet Message Bodies. Reference
- * 1996. Available at: http://www.ietf.org/rfc/rfc2045.txt
- * </p>
- * @author Jeffrey Rodriguez
- * @version $Revision$ $Date$
- *
- * @deprecated This class has been replaced by
- * {@link org.apache.commons.codec.binary.Base64}
- */
-public final class Base64 {
-
- /**
- * The default character encoding
- */
- protected static final String DEFAULT_CHAR_ENCODING = "ISO-8859-1";
-
- /**
- * The bsae 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;
-
- /**
- * Constant 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];
-
- /**
- * An empty array of type byte
- */
- private static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
-
- /**
- * Lookup table
- */
- private static byte[] lookUpBase64Alphabet = new byte[LOOKUPLENGTH];
-
- static {
-
- for (int i = 0; i < BASELENGTH; i++) {
- base64Alphabet[i] = -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) '/';
-
- }
-
- /**
- * Tests to see whether the bytes of this string are
- * Base64
- *
- * @param isValidString String to test
- * @return trus if String is base64
- */
- public static boolean isBase64(String isValidString) {
- return (isBase64(isValidString.getBytes()));
- }
-
- /**
- * Tests a byte to see whether it falls within the Base64
- * alphabet (or if it is a padding character).
- *
- * @param octect byte to test
- * @return true if byte is in alphabet or padding
- */
- public static boolean isBase64(byte octect) {
- // Should we ignore white space?
- return (octect == PAD || base64Alphabet[octect] != -1);
- }
-
- /**
- * Tests byte array to see if all characters are within the
- * Base64 alphabet
- *
- * @param arrayOctect A byte[] to test
- * @return true if all data falls within the Base64 alphabet OR if the
- * array is empty.
- */
- public static boolean isBase64(byte[] arrayOctect) {
- int length = arrayOctect.length;
- if (length == 0) {
- return true;
- }
- for (int i = 0; i < length; i++) {
- if (!Base64.isBase64(arrayOctect[i])) {
- return false;
- }
- }
- return true;
- }
-
- /**
- * Encodes hex octects into Base64
- *
- * @param binaryData Array containing binaryData
- * @return Base64-encoded array
- */
- public static byte[] encode(byte[] binaryData) {
- if (binaryData == null) {
- binaryData = EMPTY_BYTE_ARRAY;
- }
-
- int lengthDataBits = binaryData.length * EIGHTBIT;
- int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;
- int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP;
- byte encodedData[] = null;
-
-
- if (fewerThan24bits != 0) {
- //data not divisible by 24 bit
- encodedData = new byte[(numberTriplets + 1) * 4];
- } else {
- // 16 or 8 bit
- encodedData = new byte[numberTriplets * 4];
- }
-
- byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;
-
- int encodedIndex = 0;
- int dataIndex = 0;
- int i = 0;
- for (i = 0; i < numberTriplets; i++) {
-
- dataIndex = i * 3;
- b1 = binaryData[dataIndex];
- b2 = binaryData[dataIndex + 1];
- b3 = binaryData[dataIndex + 2];
-
- l = (byte) (b2 & 0x0f);
- k = (byte) (b1 & 0x03);
-
- encodedIndex = i * 4;
- 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];
- encodedData[encodedIndex + 1] = lookUpBase64Alphabet[val2
- | (k << 4)];
- encodedData[encodedIndex + 2] = lookUpBase64Alphabet[(l << 2)
- | val3];
- encodedData[encodedIndex + 3] = lookUpBase64Alphabet[b3 & 0x3f];
- }
-
- // form integral number of 6-bit groups
- dataIndex = i * 3;
- encodedIndex = i * 4;
- if (fewerThan24bits == EIGHTBIT) {
- b1 = binaryData[dataIndex];
- k = (byte) (b1 & 0x03);
- 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;
- }
- return encodedData;
- }
-
-
- /**
- * Returns the base64 encoding of String. First the String is
- * converted to byte[], using the character encoding of
- * <code>ISO-8859-1</code>.
- *
- * @param data String of data to convert
- * @return Base64-encoded String
- */
- public static String encode(String data) {
- try {
- return encode(data, DEFAULT_CHAR_ENCODING);
- } catch (UnsupportedEncodingException uee) {
- throw new IllegalStateException(uee.toString());
- }
- }
-
-
- /**
- * Returns the base64 encoding of String (by first converting to
- * byte[], using the specified <code>charEncoding</code>). The
- * return value is also a String. The Default
- * <code>codeEncoding</chode> is <code>ISO-8859-1</code>.
- *
- * @param data String of data to convert
- * @param charEncoding the character encoding to use when converting
- * a String to a byte[]
- * @return Base64-encoded String
- * @throws UnsupportedEncodingException
- */
- public static String encode(String data, String charEncoding)
- throws UnsupportedEncodingException {
-
- // Check arguments
- if (data == null) {
- data = "";
- }
- if (charEncoding == null) {
- charEncoding = DEFAULT_CHAR_ENCODING;
- }
-
- // Convert to byte[]
- ByteArrayOutputStream bos = new ByteArrayOutputStream();
- OutputStreamWriter osw = new OutputStreamWriter(bos, charEncoding);
- try {
- osw.write(data);
- } catch (IOException ioe) {
- throw new RuntimeException(ioe.toString());
- }
-
- // Encode
- byte[] encodedData = encode(bos.toByteArray());
-
- // Convert to String
- if (encodedData == null) {
- return "";
- }
- bos = new ByteArrayOutputStream(encodedData.length);
- try {
- bos.write(encodedData);
- } catch (IOException ioe) {
- throw new RuntimeException(ioe.toString());
- }
-
- return bos.toString(charEncoding);
- }
-
- /**
- * Decodes Base64 data into octects
- *
- * @param base64Data Byte array containing Base64 data
- * @return Array containing decoded data.
- */
- public static byte[] decode(byte[] base64Data) {
- // Should we throw away anything not in base64Data ?
-
- // handle the edge case, so we don't have to worry about it later
- if (base64Data.length == 0) {
- return EMPTY_BYTE_ARRAY;
- }
-
- int numberQuadruple = base64Data.length / FOURBYTE;
- byte decodedData[] = null;
- byte b1 = 0, b2 = 0, b3 = 0, b4 = 0, marker0 = 0, marker1 = 0;
-
- int encodedIndex = 0;
- int dataIndex = 0;
- {
- // this block sizes the output array properly - rlw
- int lastData = base64Data.length;
- // ignore the '=' padding
- while (base64Data[lastData - 1] == PAD) {
- if (--lastData == 0) {
- return EMPTY_BYTE_ARRAY;
- }
- }
- 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;
- }
-
-}
-
+/*
+ * ====================================================================
+ *
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2003 The Apache Software Foundation. All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. The end-user documentation included with the redistribution, if
+ * any, must include the following acknowlegement:
+ * "This product includes software developed by the
+ * Apache Software Foundation (http://www.apache.org/)."
+ * Alternately, this acknowlegement may appear in the software itself,
+ * if and wherever such third-party acknowlegements normally appear.
+ *
+ * 4. The names "The Jakarta Project", "HttpClient", and "Apache Software
+ * Foundation" must not be used to endorse or promote products derived
+ * from this software without prior written permission. For written
+ * permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ * nor may "Apache" appear in their names without prior written
+ * permission of the Apache Group.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation. For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+
+package org.apache.commons.codec.base64;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
+import java.io.UnsupportedEncodingException;
+
+/**
+ * <p>Base64 encoder and decoder.</p>
+ * <p>
+ * This class provides encoding/decoding methods for
+ * the Base64 encoding as defined by RFC 2045,
+ * N. Freed and N. Borenstein.
+ * RFC 2045: Multipurpose Internet Mail Extensions (MIME)
+ * Part One: Format of Internet Message Bodies. Reference
+ * 1996. Available at: http://www.ietf.org/rfc/rfc2045.txt
+ * </p>
+ * @author Jeffrey Rodriguez
+ * @version $Revision$ $Date$
+ *
+ * @deprecated This class has been replaced by
+ * {@link org.apache.commons.codec.binary.Base64}
+ */
+public final class Base64 {
+
+ /**
+ * The default character encoding
+ */
+ protected static final String DEFAULT_CHAR_ENCODING = "ISO-8859-1";
+
+ /**
+ * The bsae 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;
+
+ /**
+ * Constant 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];
+
+ /**
+ * An empty array of type byte
+ */
+ private static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
+
+ /**
+ * Lookup table
+ */
+ private static byte[] lookUpBase64Alphabet = new byte[LOOKUPLENGTH];
+
+ static {
+
+ for (int i = 0; i < BASELENGTH; i++) {
+ base64Alphabet[i] = -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) '/';
+
+ }
+
+ /**
+ * Tests to see whether the bytes of this string are
+ * Base64
+ *
+ * @param isValidString String to test
+ * @return trus if String is base64
+ */
+ public static boolean isBase64(String isValidString) {
+ return (isBase64(isValidString.getBytes()));
+ }
+
+ /**
+ * Tests a byte to see whether it falls within the Base64
+ * alphabet (or if it is a padding character).
+ *
+ * @param octect byte to test
+ * @return true if byte is in alphabet or padding
+ */
+ public static boolean isBase64(byte octect) {
+ // Should we ignore white space?
+ return (octect == PAD || base64Alphabet[octect] != -1);
+ }
+
+ /**
+ * Tests byte array to see if all characters are within the
+ * Base64 alphabet
+ *
+ * @param arrayOctect A byte[] to test
+ * @return true if all data falls within the Base64 alphabet OR if the
+ * array is empty.
+ */
+ public static boolean isBase64(byte[] arrayOctect) {
+ int length = arrayOctect.length;
+ if (length == 0) {
+ return true;
+ }
+ for (int i = 0; i < length; i++) {
+ if (!Base64.isBase64(arrayOctect[i])) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /**
+ * Encodes hex octects into Base64
+ *
+ * @param binaryData Array containing binaryData
+ * @return Base64-encoded array
+ */
+ public static byte[] encode(byte[] binaryData) {
+ if (binaryData == null) {
+ binaryData = EMPTY_BYTE_ARRAY;
+ }
+
+ int lengthDataBits = binaryData.length * EIGHTBIT;
+ int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;
+ int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP;
+ byte encodedData[] = null;
+
+
+ if (fewerThan24bits != 0) {
+ //data not divisible by 24 bit
+ encodedData = new byte[(numberTriplets + 1) * 4];
+ } else {
+ // 16 or 8 bit
+ encodedData = new byte[numberTriplets * 4];
+ }
+
+ byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;
+
+ int encodedIndex = 0;
+ int dataIndex = 0;
+ int i = 0;
+ for (i = 0; i < numberTriplets; i++) {
+
+ dataIndex = i * 3;
+ b1 = binaryData[dataIndex];
+ b2 = binaryData[dataIndex + 1];
+ b3 = binaryData[dataIndex + 2];
+
+ l = (byte) (b2 & 0x0f);
+ k = (byte) (b1 & 0x03);
+
+ encodedIndex = i * 4;
+ 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];
+ encodedData[encodedIndex + 1] = lookUpBase64Alphabet[val2
+ | (k << 4)];
+ encodedData[encodedIndex + 2] = lookUpBase64Alphabet[(l << 2)
+ | val3];
+ encodedData[encodedIndex + 3] = lookUpBase64Alphabet[b3 & 0x3f];
+ }
+
+ // form integral number of 6-bit groups
+ dataIndex = i * 3;
+ encodedIndex = i * 4;
+ if (fewerThan24bits == EIGHTBIT) {
+ b1 = binaryData[dataIndex];
+ k = (byte) (b1 & 0x03);
+ 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;
+ }
+ return encodedData;
+ }
+
+
+ /**
+ * Returns the base64 encoding of String. First the String is
+ * converted to byte[], using the character encoding of
+ * <code>ISO-8859-1</code>.
+ *
+ * @param data String of data to convert
+ * @return Base64-encoded String
+ */
+ public static String encode(String data) {
+ try {
+ return encode(data, DEFAULT_CHAR_ENCODING);
+ } catch (UnsupportedEncodingException uee) {
+ throw new IllegalStateException(uee.toString());
+ }
+ }
+
+
+ /**
+ * Returns the base64 encoding of String (by first converting to
+ * byte[], using the specified <code>charEncoding</code>). The
+ * return value is also a String. The Default
+ * <code>codeEncoding</chode> is <code>ISO-8859-1</code>.
+ *
+ * @param data String of data to convert
+ * @param charEncoding the character encoding to use when converting
+ * a String to a byte[]
+ * @return Base64-encoded String
+ * @throws UnsupportedEncodingException
+ */
+ public static String encode(String data, String charEncoding)
+ throws UnsupportedEncodingException {
+
+ // Check arguments
+ if (data == null) {
+ data = "";
+ }
+ if (charEncoding == null) {
+ charEncoding = DEFAULT_CHAR_ENCODING;
+ }
+
+ // Convert to byte[]
+ ByteArrayOutputStream bos = new ByteArrayOutputStream();
+ OutputStreamWriter osw = new OutputStreamWriter(bos, charEncoding);
+ try {
+ osw.write(data);
+ } catch (IOException ioe) {
+ throw new RuntimeException(ioe.toString());
+ }
+
+ // Encode
+ byte[] encodedData = encode(bos.toByteArray());
+
+ // Convert to String
+ if (encodedData == null) {
+ return "";
+ }
+ bos = new ByteArrayOutputStream(encodedData.length);
+ try {
+ bos.write(encodedData);
+ } catch (IOException ioe) {
+ throw new RuntimeException(ioe.toString());
+ }
+
+ return bos.toString(charEncoding);
+ }
+
+ /**
+ * Decodes Base64 data into octects
+ *
+ * @param base64Data Byte array containing Base64 data
+ * @return Array containing decoded data.
+ */
+ public static byte[] decode(byte[] base64Data) {
+ // Should we throw away anything not in base64Data ?
+
+ // handle the edge case, so we don't have to worry about it later
+ if (base64Data.length == 0) {
+ return EMPTY_BYTE_ARRAY;
+ }
+
+ int numberQuadruple = base64Data.length / FOURBYTE;
+ byte decodedData[] = null;
+ byte b1 = 0, b2 = 0, b3 = 0, b4 = 0, marker0 = 0, marker1 = 0;
+
+ int encodedIndex = 0;
+ int dataIndex = 0;
+ {
+ // this block sizes the output array properly - rlw
+ int lastData = base64Data.length;
+ // ignore the '=' padding
+ while (base64Data[lastData - 1] == PAD) {
+ if (--lastData == 0) {
+ return EMPTY_BYTE_ARRAY;
+ }
+ }
+ 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;
+ }
+
+}
+
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