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Ant example source code file (Base64Converter.java)

This example Ant source code file (Base64Converter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Ant tags/keywords

a, alphabet, alphabet, d, e, j, k, o, r, string, string, u, w, z

The Base64Converter.java source code

/*
 *  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.tools.ant.util;

/**
 * BASE 64 encoding of a String or an array of bytes.
 *
 * Based on RFC 1421.
 *
 **/
public class Base64Converter {

    private static final char[] ALPHABET = {
        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',  //  0 to  7
        'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',  //  8 to 15
        'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',  // 16 to 23
        'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',  // 24 to 31
        'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',  // 32 to 39
        'o', 'p', 'q', 'r', 's', 't', 'u', 'v',  // 40 to 47
        'w', 'x', 'y', 'z', '0', '1', '2', '3',  // 48 to 55
        '4', '5', '6', '7', '8', '9', '+', '/'}; // 56 to 63

    // CheckStyle:ConstantNameCheck OFF - bc
    /** Provided for BC purposes */
    public static final char[] alphabet = ALPHABET;
    // CheckStyle:ConstantNameCheck ON


    /**
     * Encode a string into base64 encoding.
     * @param s the string to encode.
     * @return the encoded string.
     */
    public String encode(String s) {
        return encode(s.getBytes());
    }

    /**
     * Encode a byte array into base64 encoding.
     * @param octetString the byte array to encode.
     * @return the encoded string.
     */
    public String encode(byte[] octetString) {
        int bits24;
        int bits6;

        char[] out = new char[((octetString.length - 1) / 3 + 1) * 4];
        int outIndex = 0;
        int i = 0;

        while ((i + 3) <= octetString.length) {
            // store the octets
            bits24 = (octetString[i++] & 0xFF) << 16;
            bits24 |= (octetString[i++] & 0xFF) << 8;
            bits24 |= octetString[i++];

            bits6 = (bits24 & 0x00FC0000) >> 18;
            out[outIndex++] = ALPHABET[bits6];
            bits6 = (bits24 & 0x0003F000) >> 12;
            out[outIndex++] = ALPHABET[bits6];
            bits6  = (bits24 & 0x00000FC0) >> 6;
            out[outIndex++] = ALPHABET[bits6];
            bits6 = (bits24 & 0x0000003F);
            out[outIndex++] = ALPHABET[bits6];
        }
        if (octetString.length - i == 2) {
            // store the octets
            bits24 = (octetString[i] & 0xFF) << 16;
            bits24 |= (octetString[i + 1] & 0xFF) << 8;
            bits6 = (bits24 & 0x00FC0000) >> 18;
            out[outIndex++] = ALPHABET[bits6];
            bits6 = (bits24 & 0x0003F000) >> 12;
            out[outIndex++] = ALPHABET[bits6];
            bits6 = (bits24 & 0x00000FC0) >> 6;
            out[outIndex++] = ALPHABET[bits6];

            // padding
            out[outIndex++] = '=';
        } else if (octetString.length - i == 1) {
            // store the octets
            bits24 = (octetString[i] & 0xFF) << 16;
            bits6 = (bits24 & 0x00FC0000) >> 18;
            out[outIndex++] = ALPHABET[bits6];
            bits6 = (bits24 & 0x0003F000) >> 12;
            out[outIndex++] = ALPHABET[bits6];

            // padding
            out[outIndex++] = '=';
            out[outIndex++] = '=';
        }
        return new String(out);
    }
}

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