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/*
 * © Copyright IBM Corp. 2012-2013
 * 
 * Licensed 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 com.ibm.commons.util.io.base64;

import java.io.IOException;

/**
 * Encodes and decodes to and from Base64 notation.
 * @ibm-api
 */
public class Base64 {

	/**
	 * Decode a base64 string to an ascii string.
	 * @param base64str the string to decode
	 * @return
	 * @ibm-api
	 */
    public static String decode(String base64str) {
    	try {
    		StringInputStream bais = new StringInputStream(base64str);
	        Base64.InputStream b64 = new Base64.InputStream(bais);
	        StringBuffer buf = new StringBuffer();
	        int byt;
	        while( (byt = b64.read()) >= 0)  {
	            buf.append((char) byt);
	        }
	        return buf.toString();
    	} catch(IOException ex) {
    		ex.printStackTrace();
    		return null;
    	}
    }
    
    /**
     * Encode a string to base64. 
     * @param str the string to encode
     * @return
     * @ibm-api
     */
    public static String encode(String str) {
    	try {
    		StringBuidlerOutputStream baos = new StringBuidlerOutputStream(str.length()*3/2);
	        Base64.OutputStream b64 = new Base64.OutputStream(baos);

	        int len = str.length();
    		for( int i=0; i