- /*
- * The Apache Software License, Version 1.1
- *
- *
- * Copyright (c) 1999-2002 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 acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Xerces" 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 name, without prior written
- * permission of the Apache Software Foundation.
- *
- * 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 and was
- * originally based on software copyright (c) 1999, International
- * Business Machines, Inc., http://www.apache.org. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
-
- package com.sun.org.apache.xerces.internal.impl.dv.util;
-
- /**
- * This class provides encode/decode for RFC 2045 Base64 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
- * This class is used by XML Schema binary format validation
- *
- * This implementation does not encode/decode streaming
- * data. You need the data that you will encode/decode
- * already on a byte arrray.
- *
- * @author Jeffrey Rodriguez
- * @author Sandy Gao
- * @version $Id: Base64.java,v 1.8 2003/05/08 20:11:55 elena Exp $
- */
- public final class Base64 {
-
- static private final int BASELENGTH = 255;
- static private final int LOOKUPLENGTH = 64;
- static private final int TWENTYFOURBITGROUP = 24;
- static private final int EIGHTBIT = 8;
- static private final int SIXTEENBIT = 16;
- static private final int SIXBIT = 6;
- static private final int FOURBYTE = 4;
- static private final int SIGN = -128;
- static private final char PAD = '=';
- static private final boolean fDebug = false;
- static final private byte [] base64Alphabet = new byte[BASELENGTH];
- static final private 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] = (char)'+';
- lookUpBase64Alphabet[63] = (char)'/';
-
- }
-
- protected static boolean isWhiteSpace(char octect) {
- return (octect == 0x20 || octect == 0xd || octect == 0xa || octect == 0x9);
- }
-
- protected static boolean isPad(char octect) {
- return (octect == PAD);
- }
-
- protected static boolean isData(char octect) {
- return (base64Alphabet[octect] != -1);
- }
-
- protected static boolean isBase64(char octect) {
- return (isWhiteSpace(octect) || isPad(octect) || isData(octect));
- }
-
- /**
- * Encodes hex octects into Base64
- *
- * @param binaryData Array containing binaryData
- * @return Encoded Base64 array
- */
- public static String encode(byte[] binaryData) {
-
- if (binaryData == null)
- return null;
-
- int lengthDataBits = binaryData.length*EIGHTBIT;
- if (lengthDataBits == 0) {
- return "";
- }
-
- int fewerThan24bits = lengthDataBits%TWENTYFOURBITGROUP;
- int numberTriplets = lengthDataBitsTWENTYFOURBITGROUP;
- int numberQuartet = fewerThan24bits != 0 ? numberTriplets+1 : numberTriplets;
- int numberLines = (numberQuartet-1)/19+1;
- 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;
- if (fDebug) {
- System.out.println("number of triplets = " + numberTriplets );
- }
-
- for (int line = 0; line < numberLines-1; line++) {
- for (int quartet = 0; quartet < 19; quartet++) {
- b1 = binaryData[dataIndex++];
- b2 = binaryData[dataIndex++];
- b3 = binaryData[dataIndex++];
-
- if (fDebug) {
- System.out.println( "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);
-
- if (fDebug) {
- System.out.println( "val2 = " + val2 );
- System.out.println( "k4 = " + (k<<4));
- System.out.println( "vak = " + (val2 | (k<<4)));
- }
-
- 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++];
-
- if (fDebug) {
- System.out.println( "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);
-
- if (fDebug) {
- System.out.println( "val2 = " + val2 );
- System.out.println( "k4 = " + (k<<4));
- System.out.println( "vak = " + (val2 | (k<<4)));
- }
-
- 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 );
- if (fDebug) {
- System.out.println("b1=" + b1);
- System.out.println("b1<<2 = " + (b1>>2) );
- }
- 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 octects
- *
- * @param binaryData Byte array containing Base64 data
- * @return Array containind decoded data.
- */
- public static byte[] decode(String encoded) {
-
- if (encoded == null)
- return null;
-
- char[] base64Data = encoded.toCharArray();
- // remove white spaces
- int len = removeWhiteSpace(base64Data);
-
- if (len%FOURBYTE != 0) {
- return null;//should be divisible by four
- }
-
- int numberQuadruple = (lenFOURBYTE );
-
- if (numberQuadruple == 0)
- return new byte[0];
-
- byte decodedData[] = null;
- byte b1=0,b2=0,b3=0, b4=0, marker0=0, marker1=0;
- char d1=0,d2=0,d3=0,d4=0;
-
- int i = 0;
- int encodedIndex = 0;
- int dataIndex = 0;
- decodedData = new byte[ (numberQuadruple)*3];
-
- for (; i<numberQuadruple-1; i++) {
-
- if (!isData( (d1 = base64Data[dataIndex++]) )||
- !isData( (d2 = base64Data[dataIndex++]) )||
- !isData( (d3 = base64Data[dataIndex++]) )||
- !isData( (d4 = base64Data[dataIndex++]) ))
- return null;//if found "no data" just return null
-
- b1 = base64Alphabet[d1];
- b2 = base64Alphabet[d2];
- b3 = base64Alphabet[d3];
- b4 = base64Alphabet[d4];
-
- decodedData[encodedIndex++] = (byte)( b1 <<2 | b2>>4 ) ;
- decodedData[encodedIndex++] = (byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) );
- decodedData[encodedIndex++] = (byte)( b3<<6 | b4 );
- }
-
- if (!isData( (d1 = base64Data[dataIndex++]) ) ||
- !isData( (d2 = base64Data[dataIndex++]) )) {
- return null;//if found "no data" just return null
- }
-
- b1 = base64Alphabet[d1];
- b2 = base64Alphabet[d2];
-
- d3 = base64Data[dataIndex++];
- d4 = base64Data[dataIndex++];
- if (!isData( (d3 ) ) ||
- !isData( (d4 ) )) {//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
- return null;
- byte[] tmp = new byte[ i*3 + 1 ];
- System.arraycopy( decodedData, 0, tmp, 0, i*3 );
- tmp[encodedIndex] = (byte)( b1 <<2 | b2>>4 ) ;
- return tmp;
- } 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
- return null;
- byte[] tmp = new byte[ i*3 + 2 ];
- System.arraycopy( decodedData, 0, tmp, 0, i*3 );
- tmp[encodedIndex++] = (byte)( b1 <<2 | b2>>4 );
- tmp[encodedIndex] = (byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) );
- return tmp;
- } else {
- return null;//an error like "3c[Pad]r", "3cdX", "3cXd", "3cXX" where X is non data
- }
- } else { //No PAD e.g 3cQl
- b3 = base64Alphabet[ d3 ];
- b4 = base64Alphabet[ d4 ];
- decodedData[encodedIndex++] = (byte)( b1 <<2 | b2>>4 ) ;
- decodedData[encodedIndex++] = (byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) );
- decodedData[encodedIndex++] = (byte)( b3<<6 | b4 );
-
- }
-
- return decodedData;
- }
-
- /**
- * remove WhiteSpace from MIME containing encoded Base64 data.
- *
- * @param data the byte array of base64 data (with WS)
- * @return the new length
- */
- protected static int removeWhiteSpace(char[] 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++) {
- if (!isWhiteSpace(data[i]))
- data[newSize++] = data[i];
- }
- return newSize;
- }
- }