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/*
 * Copyright (C) 2004 - 2014 Brian McCallister
 *
 * 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;

    }
}