Examples of Base64DecodingException

Examples of org.apache.xml.security.exceptions.Base64DecodingException

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                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)));
View Full Code Here

Examples of org.apache.xml.security.exceptions.Base64DecodingException

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            break;  
        }
       
       
        if ((data[index++]=readed)==-1) {
            throw new Base64DecodingException("decoding.general");//if found "no data" just return null
           }
       
        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 {
             throw new Base64DecodingException("decoding.general");//an error  like "3c[Pad]r", "3cdX", "3cXd", "3cXX" where X is non data
         }
     } else {
         //No PAD e.g 3cQl        
        
         os.write((byte)(  b1 <<2 | b2>>4 ) );
View Full Code Here

Examples of org.apache.xml.security.exceptions.Base64DecodingException

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   protected final static byte[] decodeInternal(byte[] base64Data) throws Base64DecodingException {
       // remove white spaces
       int 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)) {
                throw new Base64DecodingException("decoding.general");//if found "no data" just return null
        }

       
        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 {
                throw new Base64DecodingException("decoding.general");//an error  like "3c[Pad]r", "3cdX", "3cXd", "3cXX" where X is non data
            }
        } 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) ) {           
             throw new Base64DecodingException("decoding.general");//if found "no data" just return null  
           }
                      
           decodedData[encodedIndex++] = (byte)(  b1 <<2 | b2>>4 ) ;
           decodedData[encodedIndex++] = (byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) );
           decodedData[encodedIndex++] = (byte)( b3<<6 | b4 );
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Examples of org.apache.xml.security.exceptions.Base64DecodingException

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        OutputStream os) throws Base64DecodingException, IOException {     
    // remove white spaces
    int 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) )
         throw new Base64DecodingException("decoding.general");//if found "no data" just return null

       

        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) ){
             throw new Base64DecodingException("decoding.general");//if found "no data" just return null
     }

     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 {
             throw new Base64DecodingException("decoding.general");//an error  like "3c[Pad]r", "3cdX", "3cXd", "3cXX" where X is non data
         }
     } else {
         //No PAD e.g 3cQl        
         os.write((byte)(  b1 <<2 | b2>>4 ) );
         os.write( (byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) ));
View Full Code Here

Examples of org.apache.xml.security.exceptions.Base64DecodingException

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            }
         }

         return raw;
      } catch (IndexOutOfBoundsException ex) {
         throw new Base64DecodingException("utils.Base64.IllegalBitlength", ex);
      }
   }
View Full Code Here

Examples of org.apache.xml.security.exceptions.Base64DecodingException

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       // 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)) {
                throw new Base64DecodingException("decoding.general");//if found "no data" just return null
        }

       
        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 {
                throw new Base64DecodingException("decoding.general");//an error  like "3c[Pad]r", "3cdX", "3cXd", "3cXX" where X is non data
            }
        } 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) ) {           
             throw new Base64DecodingException("decoding.general");//if found "no data" just return null  
           }
                      
           decodedData[encodedIndex++] = (byte)(  b1 <<2 | b2>>4 ) ;
           decodedData[encodedIndex++] = (byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) );
           decodedData[encodedIndex++] = (byte)( b3<<6 | b4 );
View Full Code Here

Examples of org.apache.xml.security.exceptions.Base64DecodingException

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  // 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) )
         throw new Base64DecodingException("decoding.general");//if found "no data" just return null

       

        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) ){
             throw new Base64DecodingException("decoding.general");//if found "no data" just return null
     }

     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 {
             throw new Base64DecodingException("decoding.general");//an error  like "3c[Pad]r", "3cdX", "3cXd", "3cXX" where X is non data
         }
     } else {
         //No PAD e.g 3cQl        
         os.write((byte)(  b1 <<2 | b2>>4 ) );
         os.write( (byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) ));
View Full Code Here

Examples of org.apache.xml.security.exceptions.Base64DecodingException

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            break;  
        }
       
       
        if ((data[index++]=readed)==-1) {
            throw new Base64DecodingException("decoding.general");//if found "no data" just return null
           }
       
        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 {
             throw new Base64DecodingException("decoding.general");//an error  like "3c[Pad]r", "3cdX", "3cXd", "3cXX" where X is non data
         }
     } else {
         //No PAD e.g 3cQl        
        
         os.write((byte)(  b1 <<2 | b2>>4 ) );
View Full Code Here

Examples of org.apache.xml.security.exceptions.Base64DecodingException

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       // 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)) {
                throw new Base64DecodingException("decoding.general");//if found "no data" just return null
        }

       
        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 {
                throw new Base64DecodingException("decoding.general");//an error  like "3c[Pad]r", "3cdX", "3cXd", "3cXX" where X is non data
            }
        } 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) ) {           
             throw new Base64DecodingException("decoding.general");//if found "no data" just return null  
           }
                      
           decodedData[encodedIndex++] = (byte)(  b1 <<2 | b2>>4 ) ;
           decodedData[encodedIndex++] = (byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) );
           decodedData[encodedIndex++] = (byte)( b3<<6 | b4 );
View Full Code Here

Examples of org.apache.xml.security.exceptions.Base64DecodingException

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  // 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) )
         throw new Base64DecodingException("decoding.general");//if found "no data" just return null

       

        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) ){
             throw new Base64DecodingException("decoding.general");//if found "no data" just return null
     }

     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 {
             throw new Base64DecodingException("decoding.general");//an error  like "3c[Pad]r", "3cdX", "3cXd", "3cXX" where X is non data
         }
     } else {
         //No PAD e.g 3cQl        
         os.write((byte)(  b1 <<2 | b2>>4 ) );
         os.write( (byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) ));
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