Decodes Base64 data into octects : Base64 « Development Class « Java






Decodes Base64 data into octects

      
/*   Copyright 2004 The Apache Software Foundation
 *
 *   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.
 */


import java.io.UnsupportedEncodingException;
/**
 * 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.
 * 
 * 
 * From xmlbeans
 * @author Jeffrey Rodriguez
 * @author Sandy Gao
 * @version $Id: Base64.java 111285 2004-12-08 16:54:26Z cezar $
 */
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 byte PAD                = ( byte ) '=';
    static private final boolean fDebug          = false;
    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 );
        lookUpBase64Alphabet[62] = (byte) '+';
        lookUpBase64Alphabet[63] = (byte) '/';

    }

    protected static boolean isWhiteSpace(byte octect) {
        return (octect == 0x20 || octect == 0xd || octect == 0xa || octect == 0x9);
    }

    protected static boolean isPad(byte octect) {
        return (octect == PAD);
    }

    protected static boolean isData(byte octect) {
        return (base64Alphabet[octect] != -1);
    }

    protected static boolean isBase64(byte octect) {
        return (isWhiteSpace(octect) || isPad(octect) || isData(octect));
    }

    /**
     * Encodes hex octects into Base64
     *
     * @param binaryData Array containing binaryData
     * @return Encoded Base64 array
     */
    public static byte[] encode(byte[] binaryData) {

        if (binaryData == null)
            return null;

        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;
        if (fDebug) {
            System.out.println("number of triplets = " + numberTriplets );
        }
        for (i = 0; i<numberTriplets; i++) {

            dataIndex = i*3;
            b1 = binaryData[dataIndex];
            b2 = binaryData[dataIndex + 1];
            b3 = binaryData[dataIndex + 2];

            if (fDebug) {
                System.out.println( "b1= " + b1 +", b2= " + b2 + ", b3= " + b3 );
            }

            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 ];
            if (fDebug) {
                System.out.println( "val2 = " + val2 );
                System.out.println( "k4   = " + (k<<4));
                System.out.println( "vak  = " + (val2 | (k<<4)));
            }

            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 );
            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 + 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;
    }

    /**
     * Decodes Base64 data into octects
     *
     * @param base64Data Byte array containing Base64 data
     * @return Array containind decoded data.
     */
    public static byte[] decode(byte[] base64Data) {

        if (base64Data == null)
            return null;

        // remove white spaces
        base64Data = removeWhiteSpace(base64Data);

        if (base64Data.length%FOURBYTE != 0) {
            return null;//should be divisible by four
        }

        int      numberQuadruple    = (base64Data.length/FOURBYTE );

        if (numberQuadruple == 0)
            return new byte[0];

        byte     decodedData[]      = null;
        byte     b1=0,b2=0,b3=0, b4=0;//, marker0=0, marker1=0;
        byte     d1=0,d2=0,d3=0,d4=0;

        // Throw away anything not in normalizedBase64Data
        // Adjust size
        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;
    }

//    /**
//     * Decodes Base64 data into octects
//     *
//     * @param base64Data String containing Base64 data
//     * @return string containing decoded data.
//     */
//    public static String decode(String base64Data) {
//        if (base64Data == null)
//            return null;
//
//        byte[] decoded = null;
//        try {
//            decoded = decode(base64Data.getBytes("utf-8"));
//        }
//        catch(UnsupportedEncodingException e) {
//        }
//        finally {
//            return decoded == null ? null : new String(decoded);
//        }
//    }
//
//    /**
//     * Encodes octects (using utf-8) into Base64 data
//     *
//     * @param binaryData String containing Hex data
//     * @return string containing decoded data.
//     */
//    public static String encode(String binaryData) {
//        if (binaryData == null)
//            return null;
//
//        byte[] encoded = null;
//         try {
//          encoded = encode(binaryData.getBytes("utf-8"));
//        }
//        catch(UnsupportedEncodingException e) {}
//        finally {
//            return encoded == null ? null : new String(encoded);
//        }
//    }

    /**
     * remove WhiteSpace from MIME containing encoded Base64 data.
     *
     * @param data  the byte array of base64 data (with WS)
     * @return      the byte array of base64 data (without WS)
     */
    protected static byte[] removeWhiteSpace(byte[] data) {
        if (data == null)
            return null;

        // count characters that's not whitespace
        int newSize = 0;
        int len = data.length;
        for (int i = 0; i < len; i++) {
            if (!isWhiteSpace(data[i]))
                newSize++;
        }

        // if no whitespace, just return the input array
        if (newSize == len)
            return data;

        // create the array to return
        byte[] newArray = new byte[newSize];

        int j = 0;
        for (int i = 0; i < len; i++) {
            if (!isWhiteSpace(data[i]))
                newArray[j++] = data[i];
        }
        return newArray;
    }
}

   
    
    
    
    
    
  








Related examples in the same category

1.Base64 encoding/decoding.
2.Implementation of MIME's Base64 encoding and decoding conversions.
3.Encode/decode for RFC 2045 Base64 as defined by RFC 2045
4.Encode/decode for RFC 2045 Base64 as defined by RFC 2045, N. Freed and N. Borenstein.
5.Encodes and decodes to and from Base64 notation.
6.Encodes hex octects into Base64
7.Helper class to provide Base64 encoding routines.
8.Represents a collection of 64 boolean (on/off) flags.
9.byte to be tested if it is Base64 alphabet
10.to Base64
11.One of the fastest implementation of the Base64 encoding. Jakarta and others are slower
12.array of byte to encode
13.Codes number up to radix 62
14.A Base64 Encoder/Decoder
15.A fast and memory efficient class to encode and decode to and from BASE64 in full accordance with RFC 2045
16.BASE64 encoder implementation
17.Base-64 Encoder - translates from base-64 text into binary
18.Base64 Character encoder as specified in RFC1113
19.Base64 Utils
20.Base64 encoder/decoder
21.Base64 from by Funambol, Inc.
22.Convert to hex from byte arrays and back
23.Converting hexadecimal strings
24.Encode and decode data in Base64 format as described in RFC 1521
25.Encode and decode integers, times, and internationalized strings to and from popular binary formats
26.Encoding of raw bytes to base64-encoded characters, and decoding of base64 characters to raw bytes
27.Performs Base64 encoding and/or decoding
28.Provides Base64 encoding and decoding as defined by RFC 2045
29.Provides Base64 encoding and decoding with URL and filename safe alphabet as defined by RFC 3548, section 4.
30.Provides utility methods to Base64 encode data
31.QP Decoder Stream
32.QP Encoder Stream
33.A class to decode Base64 streams and strings.
34.A class to encode Base64 streams and strings.
35.Encodes binary data to plain text as Base64
36.A very fast and memory efficient class to encode and decode to and from BASE64 in full accordance with RFC 2045.
37.Decodes InputStreams which contain binary data in base64 form
38.Base 64 Converter
39.Base64 from org.cspoker.common.util
40.Base64 converted from code at http://iharder.sourceforge.net/base64/
41.Encodes and decodes to and from Base64 notation.
42.Simple Base64 string decoding function
43.Class to represent unsigned 64-bit numbers.
44.A Base64 encoder/decoder.
45.The Base64 utility class implements Base-64 and Base-85 encoding and decoding algorithms.
46.Provides Base64 encoding and decoding
47.Code to read and write Base64-encoded text.
48.Base32 encoding/decoding class.