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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tomcat.util.buf;
/**
* 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
*
* @author Jeffrey Rodriguez
*
*/
public final class Base64 {
private static org.apache.juli.logging.Log log=
org.apache.juli.logging.LogFactory.getLog( Base64.class );
static private final int BASELENGTH = 255;
static private final int LOOKUPLENGTH = 63;
static private final int TWENTYFOURBITGROUP = 24;
static private final int EIGHTBIT = 8;
static private final int SIXTEENBIT = 16;
static private final int FOURBYTE = 4;
static private final byte PAD = ( byte ) '=';
static private byte [] base64Alphabet = new byte[BASELENGTH];
static private 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 );
}
static boolean isBase64( byte octect ) {
//shall we ignore white space? JEFF??
return(octect == PAD || base64Alphabet[octect] != -1 );
}
static boolean isArrayByteBase64( byte[] arrayOctect ) {
int length = arrayOctect.length;
if ( length == 0 )
return false;
for ( int i=0; i < length; i++ ) {
if ( Base64.isBase64( arrayOctect[i] ) == false)
return false;
}
return true;
}
/**
* Encodes hex octects into Base64
*
* @param binaryData Array containing binaryData
* @return Encoded Base64 array
*/
public static byte[] encode( byte[] binaryData ) {
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;
encodedData[encodedIndex] = lookUpBase64Alphabet[ b1 >>2 ];
encodedData[encodedIndex+1] = lookUpBase64Alphabet[(b2 >>4 ) |
( k<<4 )];
encodedData[encodedIndex+2] = lookUpBase64Alphabet[ (l <<2 ) |
( b3>>6)];
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 );
encodedData[encodedIndex] = lookUpBase64Alphabet[ b1 >>2 ];
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 );
encodedData[encodedIndex] = lookUpBase64Alphabet[ b1 >>2 ];
encodedData[encodedIndex + 1] = lookUpBase64Alphabet[ (b2 >>4 )
| ( k<<4 )];
encodedData[encodedIndex + 2] = lookUpBase64Alphabet[ l<<2 ];
encodedData[encodedIndex + 3] = PAD;
}
return encodedData;
}
/**
* Decodes Base64 data into octects
*
* @param base64Data Byte array containing Base64 data
* @return Array containind decoded data.
*/
public byte[] decode( byte[] base64Data ) {
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
// Adjust size
int encodedIndex = 0;
int dataIndex = 0;
decodedData = new byte[ numberQuadruple*3 + 1 ];
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 ) ;
decodedData[encodedIndex+1] = (byte)((b2 & 0xf)<<4 );
decodedData[encodedIndex+2] = (byte) 0;
} 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) );
decodedData[encodedIndex+2] = (byte)( b3<<6);
}
encodedIndex += 3;
}
return decodedData;
}
static final int base64[]= {
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 64, 64, 64,
64, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 64,
64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
};
public static String base64Decode( String orig ) {
char chars[]=orig.toCharArray();
StringBuffer sb=new StringBuffer();
int i=0;
int shift = 0; // # of excess bits stored in accum
int acc = 0;
for (i=0; i<chars.length; i++) {
int v = base64[ chars[i] & 0xFF ];
if ( v >= 64 ) {
if( chars[i] != '=' )
if (log.isDebugEnabled())
log.debug("Wrong char in base64: " + chars[i]);
} else {
acc= ( acc << 6 ) | v;
shift += 6;
if ( shift >= 8 ) {
shift -= 8;
sb.append( (char) ((acc >> shift) & 0xff));
}
}
}
return sb.toString();
}
}
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