bs/framework/com/behosoft/util/Base64Util.java

package com.behosoft.util;


/** 
 * 
 * Copyright (c) behosoft Co.,Ltd. 
 * All Rights Reserved.
 * 
 * This software is the confidential and proprietary information of behosoft.
 * (Social Security Department). You shall not disclose such
 * Confidential Information and shall use it only in accordance with 
 * the terms of the license agreement you entered into with behosoft. 
 *
 * Distributable under GNU LGPL license by gnu.org
 */


import java.io.ByteArrayOutputStream;

/**
 * <p>
 * Title: behosoft_[子系统统名]_[模块名]
 * </p>
 * <p>
 * Description: [描述该类概要功能介绍]
 * </p>
 * 
 * @author xu
 * @version $Revision$ 2013-4-23
 * @author (lastest modification by $Author$)
 * @since 1.0
 */
public class Base64Util {
	private 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 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 static String encode(byte[] data) {
		StringBuffer sb = new StringBuffer();
		int len = data.length;
		int i = 0;
		int b1, b2, b3;

		while (i < len) {
			b1 = data[i++] & 0xff;
			if (i == len) {
				sb.append(base64EncodeChars[b1 >>> 2]);
				sb.append(base64EncodeChars[(b1 & 0x3) << 4]);
				sb.append("==");
				break;
			}
			b2 = data[i++] & 0xff;
			if (i == len) {
				sb.append(base64EncodeChars[b1 >>> 2]);
				sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]);
				sb.append(base64EncodeChars[(b2 & 0x0f) << 2]);
				sb.append("=");
				break;
			}
			b3 = data[i++] & 0xff;
			sb.append(base64EncodeChars[b1 >>> 2]);
			sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]);
			sb.append(base64EncodeChars[((b2 & 0x0f) << 2) | ((b3 & 0xc0) >>> 6)]);
			sb.append(base64EncodeChars[b3 & 0x3f]);
		}
		return sb.toString();
	}

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

		while (i < len) {

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

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

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

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