hprose.util.Base64 Maven / Gradle / Ivy

/**********************************************************\
|                                                          |
|                          hprose                          |
|                                                          |
| Official WebSite: http://www.hprose.com/                 |
|                   http://www.hprose.org/                 |
|                                                          |
\**********************************************************/
/**********************************************************\
 *                                                        *
 * Base64.java                                            *
 *                                                        *
 * Base64 for Java.                                       *
 *                                                        *
 * LastModified: Mar 10, 2018                             *
 * Author: Ma Bingyao                   *
 *                                                        *
\**********************************************************/
package hprose.util;

import hprose.io.ByteBufferStream;

public final class Base64 {    
    private final static char[] base64EncodeChars = new char[] {
        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
        'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
        'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
        'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
        'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
        'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
        'w', 'x', 'y', 'z', '0', '1', '2', '3',
        '4', '5', '6', '7', '8', '9', '+', '/' };
    private final static byte[] base64DecodeChars = new byte[] {
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
    52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
    -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
    15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
    -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
    41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1 };

    public final static String encode(byte[] data) {
        StringBuilder sb = new StringBuilder();
        int r = data.length % 3;
        int len = data.length - r;
        int i = 0;
        int c;
        while (i < len) {
            c = (0x000000ff & data[i++]) << 16 |
                (0x000000ff & data[i++]) << 8  |
                (0x000000ff & data[i++]);
            sb.append(base64EncodeChars[c >> 18])
              .append(base64EncodeChars[c >> 12 & 0x3f])
              .append(base64EncodeChars[c >> 6  & 0x3f])
              .append(base64EncodeChars[c & 0x3f]);
        }
        if (r == 1) {
            c = 0x000000ff & data[i++];
            sb.append(base64EncodeChars[c >> 2])
              .append(base64EncodeChars[(c & 0x03) << 4])
              .append("==");
        }
        else if (r == 2) {
            c = (0x000000ff & data[i++]) << 8 |
                (0x000000ff & data[i++]);
            sb.append(base64EncodeChars[c >> 10])
              .append(base64EncodeChars[c >> 4 & 0x3f])
              .append(base64EncodeChars[(c & 0x0f) << 2])
              .append("=");
        }
        return sb.toString();
    }

    public final static byte[] decode(String str) {
        byte[] data = str.getBytes();
        int len = data.length;
        ByteBufferStream buf = new ByteBufferStream(len);
        int i = 0;
        int b1, b2, b3, b4;

        while (i < len) {

            /* b1 */
            do {
                b1 = base64DecodeChars[data[i++]];
            } while (i < len && b1 == -1);
            if (b1 == -1) {
                break;
            }

            /* b2 */
            do {
                b2 = base64DecodeChars[data[i++]];
            } while (i < len && b2 == -1);
            if (b2 == -1) {
                break;
            }
            buf.write((b1 << 2) | ((b2 & 0x30) >>> 4));

            /* b3 */
            do {
                b3 = data[i++];
                if (b3 == 61) {
                    return buf.toArray();
                }
                b3 = base64DecodeChars[b3];
            } while (i < len && b3 == -1);
            if (b3 == -1) {
                break;
            }
            buf.write(((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2));

            /* b4 */
            do {
                b4 = data[i++];
                if (b4 == 61) {
                    return buf.toArray();
                }
                b4 = base64DecodeChars[b4];
            } while (i < len && b4 == -1);
            if (b4 == -1) {
                break;
            }
            buf.write(((b3 & 0x03) << 6) | b4);
        }
        return buf.toArray();
    }
}