--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.xml.crypto/share/classes/com/sun/org/apache/xml/internal/security/utils/Base64.java Sun Aug 17 15:54:13 2014 +0100
@@ -0,0 +1,798 @@
+/*
+ * reserved comment block
+ * DO NOT REMOVE OR ALTER!
+ */
+/**
+ * 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 com.sun.org.apache.xml.internal.security.utils;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.math.BigInteger;
+
+import com.sun.org.apache.xml.internal.security.exceptions.Base64DecodingException;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.Node;
+import org.w3c.dom.Text;
+
+/**
+ * Implementation of MIME's Base64 encoding and decoding conversions.
+ * Optimized code. (raw version taken from oreilly.jonathan.util,
+ * and currently org.apache.xerces.ds.util.Base64)
+ *
+ * @author Raul Benito(Of the xerces copy, and little adaptations).
+ * @author Anli Shundi
+ * @author Christian Geuer-Pollmann
+ * @see <A HREF="ftp://ftp.isi.edu/in-notes/rfc2045.txt">RFC 2045</A>
+ * @see com.sun.org.apache.xml.internal.security.transforms.implementations.TransformBase64Decode
+ */
+public class Base64 {
+
+ /** Field BASE64DEFAULTLENGTH */
+ public static final int BASE64DEFAULTLENGTH = 76;
+
+ private static final int BASELENGTH = 255;
+ private static final int LOOKUPLENGTH = 64;
+ private static final int TWENTYFOURBITGROUP = 24;
+ private static final int EIGHTBIT = 8;
+ private static final int SIXTEENBIT = 16;
+ private static final int FOURBYTE = 4;
+ private static final int SIGN = -128;
+ private static final char PAD = '=';
+ private static final byte [] base64Alphabet = new byte[BASELENGTH];
+ private static final char [] lookUpBase64Alphabet = new char[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] = (char)('A' + i);
+ }
+
+ for (int i = 26, j = 0; i <= 51; i++, j++) {
+ lookUpBase64Alphabet[i] = (char)('a' + j);
+ }
+
+ for (int i = 52, j = 0; i <= 61; i++, j++) {
+ lookUpBase64Alphabet[i] = (char)('0' + j);
+ }
+ lookUpBase64Alphabet[62] = '+';
+ lookUpBase64Alphabet[63] = '/';
+ }
+
+ private Base64() {
+ // we don't allow instantiation
+ }
+
+ /**
+ * Returns a byte-array representation of a <code>{@link BigInteger}<code>.
+ * No sign-bit is output.
+ *
+ * <b>N.B.:</B> <code>{@link BigInteger}<code>'s toByteArray
+ * returns eventually longer arrays because of the leading sign-bit.
+ *
+ * @param big <code>BigInteger<code> to be converted
+ * @param bitlen <code>int<code> the desired length in bits of the representation
+ * @return a byte array with <code>bitlen</code> bits of <code>big</code>
+ */
+ static final byte[] getBytes(BigInteger big, int bitlen) {
+
+ //round bitlen
+ bitlen = ((bitlen + 7) >> 3) << 3;
+
+ if (bitlen < big.bitLength()) {
+ throw new IllegalArgumentException(I18n.translate("utils.Base64.IllegalBitlength"));
+ }
+
+ byte[] bigBytes = big.toByteArray();
+
+ if (((big.bitLength() % 8) != 0)
+ && (((big.bitLength() / 8) + 1) == (bitlen / 8))) {
+ return bigBytes;
+ }
+
+ // some copying needed
+ int startSrc = 0; // no need to skip anything
+ int bigLen = bigBytes.length; //valid length of the string
+
+ if ((big.bitLength() % 8) == 0) { // correct values
+ startSrc = 1; // skip sign bit
+
+ bigLen--; // valid length of the string
+ }
+
+ int startDst = bitlen / 8 - bigLen; //pad with leading nulls
+ byte[] resizedBytes = new byte[bitlen / 8];
+
+ System.arraycopy(bigBytes, startSrc, resizedBytes, startDst, bigLen);
+
+ return resizedBytes;
+ }
+
+ /**
+ * Encode in Base64 the given <code>{@link BigInteger}<code>.
+ *
+ * @param big
+ * @return String with Base64 encoding
+ */
+ public static final String encode(BigInteger big) {
+ return encode(getBytes(big, big.bitLength()));
+ }
+
+ /**
+ * Returns a byte-array representation of a <code>{@link BigInteger}<code>.
+ * No sign-bit is output.
+ *
+ * <b>N.B.:</B> <code>{@link BigInteger}<code>'s toByteArray
+ * returns eventually longer arrays because of the leading sign-bit.
+ *
+ * @param big <code>BigInteger<code> to be converted
+ * @param bitlen <code>int<code> the desired length in bits of the representation
+ * @return a byte array with <code>bitlen</code> bits of <code>big</code>
+ */
+ public static final byte[] encode(BigInteger big, int bitlen) {
+
+ //round bitlen
+ bitlen = ((bitlen + 7) >> 3) << 3;
+
+ if (bitlen < big.bitLength()) {
+ throw new IllegalArgumentException(I18n.translate("utils.Base64.IllegalBitlength"));
+ }
+
+ byte[] bigBytes = big.toByteArray();
+
+ if (((big.bitLength() % 8) != 0)
+ && (((big.bitLength() / 8) + 1) == (bitlen / 8))) {
+ return bigBytes;
+ }
+
+ // some copying needed
+ int startSrc = 0; // no need to skip anything
+ int bigLen = bigBytes.length; //valid length of the string
+
+ if ((big.bitLength() % 8) == 0) { // correct values
+ startSrc = 1; // skip sign bit
+
+ bigLen--; // valid length of the string
+ }
+
+ int startDst = bitlen / 8 - bigLen; //pad with leading nulls
+ byte[] resizedBytes = new byte[bitlen / 8];
+
+ System.arraycopy(bigBytes, startSrc, resizedBytes, startDst, bigLen);
+
+ return resizedBytes;
+ }
+
+ /**
+ * Method decodeBigIntegerFromElement
+ *
+ * @param element
+ * @return the biginteger obtained from the node
+ * @throws Base64DecodingException
+ */
+ public static final BigInteger decodeBigIntegerFromElement(Element element)
+ throws Base64DecodingException {
+ return new BigInteger(1, Base64.decode(element));
+ }
+
+ /**
+ * Method decodeBigIntegerFromText
+ *
+ * @param text
+ * @return the biginter obtained from the text node
+ * @throws Base64DecodingException
+ */
+ public static final BigInteger decodeBigIntegerFromText(Text text)
+ throws Base64DecodingException {
+ return new BigInteger(1, Base64.decode(text.getData()));
+ }
+
+ /**
+ * This method takes an (empty) Element and a BigInteger and adds the
+ * base64 encoded BigInteger to the Element.
+ *
+ * @param element
+ * @param biginteger
+ */
+ public static final void fillElementWithBigInteger(Element element, BigInteger biginteger) {
+
+ String encodedInt = encode(biginteger);
+
+ if (!XMLUtils.ignoreLineBreaks() && encodedInt.length() > BASE64DEFAULTLENGTH) {
+ encodedInt = "\n" + encodedInt + "\n";
+ }
+
+ Document doc = element.getOwnerDocument();
+ Text text = doc.createTextNode(encodedInt);
+
+ element.appendChild(text);
+ }
+
+ /**
+ * Method decode
+ *
+ * Takes the <CODE>Text</CODE> children of the Element and interprets
+ * them as input for the <CODE>Base64.decode()</CODE> function.
+ *
+ * @param element
+ * @return the byte obtained of the decoding the element
+ * $todo$ not tested yet
+ * @throws Base64DecodingException
+ */
+ public static final byte[] decode(Element element) throws Base64DecodingException {
+
+ Node sibling = element.getFirstChild();
+ StringBuilder sb = new StringBuilder();
+
+ while (sibling != null) {
+ if (sibling.getNodeType() == Node.TEXT_NODE) {
+ Text t = (Text) sibling;
+
+ sb.append(t.getData());
+ }
+ sibling = sibling.getNextSibling();
+ }
+
+ return decode(sb.toString());
+ }
+
+ /**
+ * Method encodeToElement
+ *
+ * @param doc
+ * @param localName
+ * @param bytes
+ * @return an Element with the base64 encoded in the text.
+ *
+ */
+ public static final Element encodeToElement(Document doc, String localName, byte[] bytes) {
+ Element el = XMLUtils.createElementInSignatureSpace(doc, localName);
+ Text text = doc.createTextNode(encode(bytes));
+
+ el.appendChild(text);
+
+ return el;
+ }
+
+ /**
+ * Method decode
+ *
+ * @param base64
+ * @return the UTF bytes of the base64
+ * @throws Base64DecodingException
+ *
+ */
+ public static final byte[] decode(byte[] base64) throws Base64DecodingException {
+ return decodeInternal(base64, -1);
+ }
+
+ /**
+ * Encode a byte array and fold lines at the standard 76th character unless
+ * ignore line breaks property is set.
+ *
+ * @param binaryData <code>byte[]<code> to be base64 encoded
+ * @return the <code>String<code> with encoded data
+ */
+ public static final String encode(byte[] binaryData) {
+ return XMLUtils.ignoreLineBreaks()
+ ? encode(binaryData, Integer.MAX_VALUE)
+ : encode(binaryData, BASE64DEFAULTLENGTH);
+ }
+
+ /**
+ * Base64 decode the lines from the reader and return an InputStream
+ * with the bytes.
+ *
+ * @param reader
+ * @return InputStream with the decoded bytes
+ * @exception IOException passes what the reader throws
+ * @throws IOException
+ * @throws Base64DecodingException
+ */
+ public static final byte[] decode(BufferedReader reader)
+ throws IOException, Base64DecodingException {
+
+ byte[] retBytes = null;
+ UnsyncByteArrayOutputStream baos = null;
+ try {
+ baos = new UnsyncByteArrayOutputStream();
+ String line;
+
+ while (null != (line = reader.readLine())) {
+ byte[] bytes = decode(line);
+ baos.write(bytes);
+ }
+ retBytes = baos.toByteArray();
+ } finally {
+ baos.close();
+ }
+
+ return retBytes;
+ }
+
+ protected static final boolean isWhiteSpace(byte octect) {
+ return (octect == 0x20 || octect == 0xd || octect == 0xa || octect == 0x9);
+ }
+
+ protected static final boolean isPad(byte octect) {
+ return (octect == PAD);
+ }
+
+ /**
+ * Encodes hex octets into Base64
+ *
+ * @param binaryData Array containing binaryData
+ * @return Encoded Base64 array
+ */
+ /**
+ * Encode a byte array in Base64 format and return an optionally
+ * wrapped line.
+ *
+ * @param binaryData <code>byte[]</code> data to be encoded
+ * @param length <code>int<code> length of wrapped lines; No wrapping if less than 4.
+ * @return a <code>String</code> with encoded data
+ */
+ public static final String encode(byte[] binaryData,int length) {
+ if (length < 4) {
+ length = Integer.MAX_VALUE;
+ }
+
+ if (binaryData == null) {
+ return null;
+ }
+
+ int lengthDataBits = binaryData.length * EIGHTBIT;
+ if (lengthDataBits == 0) {
+ return "";
+ }
+
+ int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;
+ int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP;
+ int numberQuartet = fewerThan24bits != 0 ? numberTriplets + 1 : numberTriplets;
+ int quartesPerLine = length / 4;
+ int numberLines = (numberQuartet - 1) / quartesPerLine;
+ char encodedData[] = null;
+
+ encodedData = new char[numberQuartet * 4 + numberLines];
+
+ byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;
+ int encodedIndex = 0;
+ int dataIndex = 0;
+ int i = 0;
+
+ for (int line = 0; line < numberLines; line++) {
+ for (int quartet = 0; quartet < 19; quartet++) {
+ b1 = binaryData[dataIndex++];
+ b2 = binaryData[dataIndex++];
+ b3 = binaryData[dataIndex++];
+
+ 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];
+ encodedData[encodedIndex++] = lookUpBase64Alphabet[val2 | (k << 4)];
+ encodedData[encodedIndex++] = lookUpBase64Alphabet[(l << 2) | val3];
+ encodedData[encodedIndex++] = lookUpBase64Alphabet[b3 & 0x3f];
+
+ i++;
+ }
+ encodedData[encodedIndex++] = 0xa;
+ }
+
+ for (; i < numberTriplets; i++) {
+ b1 = binaryData[dataIndex++];
+ b2 = binaryData[dataIndex++];
+ b3 = binaryData[dataIndex++];
+
+ 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];
+ encodedData[encodedIndex++] = lookUpBase64Alphabet[val2 | (k << 4)];
+ encodedData[encodedIndex++] = lookUpBase64Alphabet[(l << 2) | val3];
+ encodedData[encodedIndex++] = lookUpBase64Alphabet[b3 & 0x3f];
+ }
+
+ // form integral number of 6-bit groups
+ 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++] = lookUpBase64Alphabet[k << 4];
+ encodedData[encodedIndex++] = PAD;
+ encodedData[encodedIndex++] = 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++] = lookUpBase64Alphabet[val2 | (k << 4)];
+ encodedData[encodedIndex++] = lookUpBase64Alphabet[l << 2];
+ encodedData[encodedIndex++] = PAD;
+ }
+
+ //encodedData[encodedIndex] = 0xa;
+
+ return new String(encodedData);
+ }
+
+ /**
+ * Decodes Base64 data into octets
+ *
+ * @param encoded String containing base64 encoded data
+ * @return byte array containing the decoded data
+ * @throws Base64DecodingException if there is a problem decoding the data
+ */
+ public static final byte[] decode(String encoded) throws Base64DecodingException {
+ if (encoded == null) {
+ return null;
+ }
+ byte[] bytes = new byte[encoded.length()];
+ int len = getBytesInternal(encoded, bytes);
+ return decodeInternal(bytes, len);
+ }
+
+ protected static final int getBytesInternal(String s, byte[] result) {
+ int length = s.length();
+
+ int newSize = 0;
+ for (int i = 0; i < length; i++) {
+ byte dataS = (byte)s.charAt(i);
+ if (!isWhiteSpace(dataS)) {
+ result[newSize++] = dataS;
+ }
+ }
+ return newSize;
+ }
+
+ protected static final byte[] decodeInternal(byte[] base64Data, int len)
+ throws Base64DecodingException {
+ // remove white spaces
+ if (len == -1) {
+ len = removeWhiteSpace(base64Data);
+ }
+
+ if (len % FOURBYTE != 0) {
+ throw new Base64DecodingException("decoding.divisible.four");
+ //should be divisible by four
+ }
+
+ int numberQuadruple = (len / FOURBYTE);
+
+ if (numberQuadruple == 0) {
+ return new byte[0];
+ }
+
+ byte decodedData[] = null;
+ byte b1 = 0, b2 = 0, b3 = 0, b4 = 0;
+
+ int i = 0;
+ int encodedIndex = 0;
+ int dataIndex = 0;
+
+ //decodedData = new byte[ (numberQuadruple)*3];
+ dataIndex = (numberQuadruple - 1) * 4;
+ encodedIndex = (numberQuadruple - 1) * 3;
+ //first last bits.
+ b1 = base64Alphabet[base64Data[dataIndex++]];
+ b2 = base64Alphabet[base64Data[dataIndex++]];
+ if ((b1==-1) || (b2==-1)) {
+ //if found "no data" just return null
+ throw new Base64DecodingException("decoding.general");
+ }
+
+
+ byte d3, d4;
+ b3 = base64Alphabet[d3 = base64Data[dataIndex++]];
+ b4 = base64Alphabet[d4 = base64Data[dataIndex++]];
+ if ((b3 == -1) || (b4 == -1) ) {
+ //Check if they are PAD characters
+ if (isPad(d3) && isPad(d4)) { //Two PAD e.g. 3c[Pad][Pad]
+ if ((b2 & 0xf) != 0) { //last 4 bits should be zero
+ throw new Base64DecodingException("decoding.general");
+ }
+ decodedData = new byte[encodedIndex + 1];
+ decodedData[encodedIndex] = (byte)(b1 << 2 | b2 >> 4) ;
+ } else if (!isPad(d3) && isPad(d4)) { //One PAD e.g. 3cQ[Pad]
+ if ((b3 & 0x3) != 0) { //last 2 bits should be zero
+ throw new Base64DecodingException("decoding.general");
+ }
+ decodedData = new byte[encodedIndex + 2];
+ decodedData[encodedIndex++] = (byte)(b1 << 2 | b2 >> 4);
+ decodedData[encodedIndex] = (byte)(((b2 & 0xf) << 4) |((b3 >> 2) & 0xf));
+ } else {
+ //an error like "3c[Pad]r", "3cdX", "3cXd", "3cXX" where X is non data
+ throw new Base64DecodingException("decoding.general");
+ }
+ } else {
+ //No PAD e.g 3cQl
+ decodedData = new byte[encodedIndex+3];
+ decodedData[encodedIndex++] = (byte)(b1 << 2 | b2 >> 4) ;
+ decodedData[encodedIndex++] = (byte)(((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
+ decodedData[encodedIndex++] = (byte)(b3 << 6 | b4);
+ }
+ encodedIndex = 0;
+ dataIndex = 0;
+ //the begin
+ for (i = numberQuadruple - 1; i > 0; i--) {
+ b1 = base64Alphabet[base64Data[dataIndex++]];
+ b2 = base64Alphabet[base64Data[dataIndex++]];
+ b3 = base64Alphabet[base64Data[dataIndex++]];
+ b4 = base64Alphabet[base64Data[dataIndex++]];
+
+ if ((b1 == -1) ||
+ (b2 == -1) ||
+ (b3 == -1) ||
+ (b4 == -1)) {
+ //if found "no data" just return null
+ throw new Base64DecodingException("decoding.general");
+ }
+
+ decodedData[encodedIndex++] = (byte)(b1 << 2 | b2 >> 4) ;
+ decodedData[encodedIndex++] = (byte)(((b2 & 0xf) << 4) |((b3 >> 2) & 0xf));
+ decodedData[encodedIndex++] = (byte)(b3 << 6 | b4 );
+ }
+ return decodedData;
+ }
+
+ /**
+ * Decodes Base64 data into outputstream
+ *
+ * @param base64Data String containing Base64 data
+ * @param os the outputstream
+ * @throws IOException
+ * @throws Base64DecodingException
+ */
+ public static final void decode(String base64Data, OutputStream os)
+ throws Base64DecodingException, IOException {
+ byte[] bytes = new byte[base64Data.length()];
+ int len = getBytesInternal(base64Data, bytes);
+ decode(bytes,os,len);
+ }
+
+ /**
+ * Decodes Base64 data into outputstream
+ *
+ * @param base64Data Byte array containing Base64 data
+ * @param os the outputstream
+ * @throws IOException
+ * @throws Base64DecodingException
+ */
+ public static final void decode(byte[] base64Data, OutputStream os)
+ throws Base64DecodingException, IOException {
+ decode(base64Data,os,-1);
+ }
+
+ protected static final void decode(byte[] base64Data, OutputStream os, int len)
+ throws Base64DecodingException, IOException {
+ // remove white spaces
+ if (len == -1) {
+ len = removeWhiteSpace(base64Data);
+ }
+
+ if (len % FOURBYTE != 0) {
+ throw new Base64DecodingException("decoding.divisible.four");
+ //should be divisible by four
+ }
+
+ int numberQuadruple = (len / FOURBYTE);
+
+ if (numberQuadruple == 0) {
+ return;
+ }
+
+ //byte decodedData[] = null;
+ byte b1 = 0, b2 = 0, b3 = 0, b4 = 0;
+
+ int i = 0;
+ int dataIndex = 0;
+
+ //the begin
+ for (i=numberQuadruple - 1; i > 0; i--) {
+ b1 = base64Alphabet[base64Data[dataIndex++]];
+ b2 = base64Alphabet[base64Data[dataIndex++]];
+ b3 = base64Alphabet[base64Data[dataIndex++]];
+ b4 = base64Alphabet[base64Data[dataIndex++]];
+ if ((b1 == -1) ||
+ (b2 == -1) ||
+ (b3 == -1) ||
+ (b4 == -1) ) {
+ //if found "no data" just return null
+ throw new Base64DecodingException("decoding.general");
+ }
+
+ os.write((byte)(b1 << 2 | b2 >> 4));
+ os.write((byte)(((b2 & 0xf) << 4 ) | ((b3 >> 2) & 0xf)));
+ os.write( (byte)(b3 << 6 | b4));
+ }
+ b1 = base64Alphabet[base64Data[dataIndex++]];
+ b2 = base64Alphabet[base64Data[dataIndex++]];
+
+ // first last bits.
+ if ((b1 == -1) || (b2 == -1) ) {
+ //if found "no data" just return null
+ throw new Base64DecodingException("decoding.general");
+ }
+
+ byte d3, d4;
+ b3 = base64Alphabet[d3 = base64Data[dataIndex++]];
+ b4 = base64Alphabet[d4 = base64Data[dataIndex++]];
+ if ((b3 == -1 ) || (b4 == -1) ) { //Check if they are PAD characters
+ if (isPad(d3) && isPad(d4)) { //Two PAD e.g. 3c[Pad][Pad]
+ if ((b2 & 0xf) != 0) { //last 4 bits should be zero
+ throw new Base64DecodingException("decoding.general");
+ }
+ os.write((byte)(b1 << 2 | b2 >> 4));
+ } else if (!isPad(d3) && isPad(d4)) { //One PAD e.g. 3cQ[Pad]
+ if ((b3 & 0x3 ) != 0) { //last 2 bits should be zero
+ throw new Base64DecodingException("decoding.general");
+ }
+ os.write((byte)(b1 << 2 | b2 >> 4));
+ os.write((byte)(((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf)));
+ } else {
+ //an error like "3c[Pad]r", "3cdX", "3cXd", "3cXX" where X is non data
+ throw new Base64DecodingException("decoding.general");
+ }
+ } else {
+ //No PAD e.g 3cQl
+ os.write((byte)(b1 << 2 | b2 >> 4));
+ os.write( (byte)(((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf)));
+ os.write((byte)(b3 << 6 | b4));
+ }
+ }
+
+ /**
+ * Decodes Base64 data into outputstream
+ *
+ * @param is containing Base64 data
+ * @param os the outputstream
+ * @throws IOException
+ * @throws Base64DecodingException
+ */
+ public static final void decode(InputStream is, OutputStream os)
+ throws Base64DecodingException, IOException {
+ //byte decodedData[] = null;
+ byte b1 = 0, b2 = 0, b3 = 0, b4 = 0;
+
+ int index=0;
+ byte[] data = new byte[4];
+ int read;
+ //the begin
+ while ((read = is.read()) > 0) {
+ byte readed = (byte)read;
+ if (isWhiteSpace(readed)) {
+ continue;
+ }
+ if (isPad(readed)) {
+ data[index++] = readed;
+ if (index == 3) {
+ data[index++] = (byte)is.read();
+ }
+ break;
+ }
+
+ if ((data[index++] = readed) == -1) {
+ //if found "no data" just return null
+ throw new Base64DecodingException("decoding.general");
+ }
+
+ if (index != 4) {
+ continue;
+ }
+ index = 0;
+ b1 = base64Alphabet[data[0]];
+ b2 = base64Alphabet[data[1]];
+ b3 = base64Alphabet[data[2]];
+ b4 = base64Alphabet[data[3]];
+
+ os.write((byte)(b1 << 2 | b2 >> 4));
+ os.write((byte)(((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf)));
+ os.write((byte)(b3 << 6 | b4));
+ }
+
+ byte d1 = data[0], d2 = data[1], d3 = data[2], d4 = data[3];
+ b1 = base64Alphabet[d1];
+ b2 = base64Alphabet[d2];
+ b3 = base64Alphabet[d3];
+ b4 = base64Alphabet[d4];
+ if ((b3 == -1) || (b4 == -1)) { //Check if they are PAD characters
+ if (isPad(d3) && isPad(d4)) { //Two PAD e.g. 3c[Pad][Pad]
+ if ((b2 & 0xf) != 0) { //last 4 bits should be zero
+ throw new Base64DecodingException("decoding.general");
+ }
+ os.write((byte)(b1 << 2 | b2 >> 4));
+ } else if (!isPad(d3) && isPad(d4)) { //One PAD e.g. 3cQ[Pad]
+ b3 = base64Alphabet[d3];
+ if ((b3 & 0x3) != 0) { //last 2 bits should be zero
+ throw new Base64DecodingException("decoding.general");
+ }
+ os.write((byte)(b1 << 2 | b2 >> 4));
+ os.write((byte)(((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf)));
+ } else {
+ //an error like "3c[Pad]r", "3cdX", "3cXd", "3cXX" where X is non data
+ throw new Base64DecodingException("decoding.general");
+ }
+ } else {
+ //No PAD e.g 3cQl
+ os.write((byte)(b1 << 2 | b2 >> 4));
+ os.write((byte)(((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf)));
+ os.write((byte)(b3 << 6 | b4));
+ }
+ }
+
+ /**
+ * remove WhiteSpace from MIME containing encoded Base64 data.
+ *
+ * @param data the byte array of base64 data (with WS)
+ * @return the new length
+ */
+ protected static final int removeWhiteSpace(byte[] data) {
+ if (data == null) {
+ return 0;
+ }
+
+ // count characters that's not whitespace
+ int newSize = 0;
+ int len = data.length;
+ for (int i = 0; i < len; i++) {
+ byte dataS = data[i];
+ if (!isWhiteSpace(dataS)) {
+ data[newSize++] = dataS;
+ }
+ }
+ return newSize;
+ }
+}