Java Base64 base64(String value)

Description

Creates the Base64 value.

License

Apache License

Declaration

public static String base64(String value) 

Method Source Code

//package com.java2s;
/*****************************************************************
 * 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
 * <p>//from w  w  w.j  ava  2 s . c o m
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.
 ****************************************************************/

public class Main {
    /**
     * Creates the Base64 value.
     */
    public static String base64(String value) {
        StringBuffer cb = new StringBuffer();

        int i = 0;
        for (i = 0; i + 2 < value.length(); i += 3) {
            long chunk = (int) value.charAt(i);
            chunk = (chunk << 8) + (int) value.charAt(i + 1);
            chunk = (chunk << 8) + (int) value.charAt(i + 2);

            cb.append(encode(chunk >> 18));
            cb.append(encode(chunk >> 12));
            cb.append(encode(chunk >> 6));
            cb.append(encode(chunk));
        }

        if (i + 1 < value.length()) {
            long chunk = (int) value.charAt(i);
            chunk = (chunk << 8) + (int) value.charAt(i + 1);
            chunk <<= 8;

            cb.append(encode(chunk >> 18));
            cb.append(encode(chunk >> 12));
            cb.append(encode(chunk >> 6));
            cb.append('=');
        } else if (i < value.length()) {
            long chunk = (int) value.charAt(i);
            chunk <<= 16;

            cb.append(encode(chunk >> 18));
            cb.append(encode(chunk >> 12));
            cb.append('=');
            cb.append('=');
        }

        return cb.toString();
    }

    public static char encode(long d) {
        d &= 0x3f;
        if (d < 26)
            return (char) (d + 'A');
        else if (d < 52)
            return (char) (d + 'a' - 26);
        else if (d < 62)
            return (char) (d + '0' - 52);
        else if (d == 62)
            return '+';
        else
            return '/';
    }
}

Related

1. base64(byte[] data)
2. base64(byte[] raw)
3. base64(final byte[] stringArray)
4. Base64(String msg)
5. base64(String string)
6. base64Append(StringBuilder sb, int digit, boolean haveNonZero)
7. base64Append(StringBuilder sb, int digit, boolean haveNonZero)
8. base64Character(int number)
9. base64CharToValue(byte c)