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jDBI is designed to provide convenient tabular data access in
Java(tm). It uses the Java collections framework for query
results, provides a convenient means of externalizing sql
statements, and provides named parameter support for any database
being used.
/*
* 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.skife.jdbi.v2.sqlobject.stringtemplate;
import java.nio.charset.Charset;
/**
* 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
* @version $Id$
*/
final class Base64 {
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 SIXBIT = 6;
private static final int FOURBYTE = 4;
private static final byte PAD = ( byte ) '=';
private static byte [] base64Alphabet = new byte[BASELENGTH];
private static byte [] lookUpBase64Alphabet = new byte[LOOKUPLENGTH];
static {
for (int i = 0; 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) '/';
}
public static boolean isBase64( String isValidString ){
return isArrayByteBase64( isValidString.getBytes(Charset.forName("UTF-8")));
}
public static boolean isBase64( byte octect ) {
//shall we ignore white space? JEFF??
return octect == PAD || base64Alphabet[octect] != -1;
}
public 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 byte[] encode( byte[] binaryData ) {
int lengthDataBits = binaryData.length*EIGHTBIT;
int fewerThan24bits = lengthDataBits%TWENTYFOURBITGROUP;
int numberTriplets = lengthDataBits/TWENTYFOURBITGROUP;
byte encodedData[] = null;
if ( fewerThan24bits != 0 ) {
encodedData = new byte[ (numberTriplets + 1 )*4 ];
}
else {
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>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 binaryData 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>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;
}
}
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