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java sdk for qcloud cos

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/*
 * Copyright 2010-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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.
 
 * According to cos feature, we modify some class，comment, field name, etc.
 */


package com.qcloud.cos.utils;

import java.nio.charset.Charset;

public enum Base64 {
    ;
    private static final Base64Codec codec = new Base64Codec();

    /**
     * Returns a base 64 encoded string of the given bytes.
     */
    public static String encodeAsString(byte[] bytes) {
        if (bytes == null)
            return null;
        return new String(codec.encode(bytes), Charset.forName("ISO-8859-1"));
    }

    /**
     * Returns a 64 encoded byte array of the given bytes.
     */
    public static byte[] encode(byte[] bytes) {
        return bytes == null || bytes.length == 0 ? bytes : codec.encode(bytes);
    }

    /**
     * Decodes the given base 64 encoded string, skipping carriage returns, line feeds and spaces as
     * needed.
     */
    public static byte[] decode(String b64) {
        if (b64 == null)
            return null;
        if (b64.length() == 0)
            return new byte[0];
        byte[] buf = new byte[b64.length()];
        int len = CodecUtils.sanitize(b64, buf);
        return codec.decode(buf, len);
    }

    /**
     * Decodes the given base 64 encoded bytes.
     */
    public static byte[] decode(byte[] b64) {
        return b64 == null || b64.length == 0 ? b64 : codec.decode(b64, b64.length);
    }
}