base64 encoder in Java

gistfile1.java

	private static final char [] base64Map =
		("ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
		 "abcdefghijklmnopqrstuvwxyz" +
		 "0123456789+/").toCharArray();
	private static String base64Encode (byte [] bytes)
	{
		if (bytes.length % 3 != 0)
			bytes = Arrays.copyOf(bytes, bytes.length + 3 - bytes.length % 3);
		char [] str = new char [bytes.length*4/3];
		for (int i = 0; i < str.length / 4; i ++) {
			int code = ((bytes[i*3] & 0xff) << 16) +
				((bytes[i*3+1] & 0xff) << 8) +
				(bytes[i*3+2] & 0xff);
			str[i*4+0] = base64Map[(code >> 18) & 0x3f];
			str[i*4+1] = base64Map[(code >> 12) & 0x3f];
			str[i*4+2] = base64Map[(code >> 6) & 0x3f];
			str[i*4+3] = base64Map[code & 0x3f];
		}
		return new String(str);
	}