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A single bundled dependency that includes all service and dependent JARs with third-party libraries relocated to different namespaces.

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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.io.ByteArrayInputStream;
import java.nio.ByteBuffer;
import java.util.Arrays;

import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Hex;

/**
 * Utilities for encoding and decoding binary data to and from different forms.
 */
public class BinaryUtils {
    /**
     * Converts byte data to a Hex-encoded string in lower case.
     *
     * @param data data to hex encode.
     *
     * @return hex-encoded string.
     */
    public static String toHex(byte[] data) {
        return Hex.encodeHexString(data);
    }

    /**
     * Converts a Hex-encoded data string to the original byte data.
     *
     * @param hexData hex-encoded data to decode.
     * @return decoded data from the hex string.
     * @throws DecoderException
     */
    public static byte[] fromHex(String hexData) throws DecoderException {
        return Hex.decodeHex(hexData.toCharArray());
    }

    /**
     * Converts byte data to a Base64-encoded string.
     *
     * @param data data to Base64 encode.
     * @return encoded Base64 string.
     */
    public static String toBase64(byte[] data) {
        return Base64.encodeAsString(data);
    }

    /**
     * Converts a Base64-encoded string to the original byte data.
     *
     * @param b64Data a Base64-encoded string to decode.
     *
     * @return bytes decoded from a Base64 string.
     */
    public static byte[] fromBase64(String b64Data) {
        return b64Data == null ? null : Base64.decode(b64Data);
    }

    /**
     * Wraps a ByteBuffer in an InputStream. If the input {@code byteBuffer} is null, returns an
     * empty stream.
     *
     * @param byteBuffer The ByteBuffer to wrap.
     *
     * @return An InputStream wrapping the ByteBuffer content.
     */
    public static ByteArrayInputStream toStream(ByteBuffer byteBuffer) {
        if (byteBuffer == null) {
            return new ByteArrayInputStream(new byte[0]);
        }
        return new ByteArrayInputStream(copyBytesFrom(byteBuffer));
    }

    /**
     * Returns a copy of all the bytes from the given ByteBuffer, from the beginning to
     * the buffer's limit; or null if the input is null.
     * 

* The internal states of the given byte buffer will be restored when this method completes * execution. *

* When handling ByteBuffer from user's input, it's typical to call the * {@link #copyBytesFrom(ByteBuffer)} instead of {@link #copyAllBytesFrom(ByteBuffer)} so as to * account for the position of the input ByteBuffer. The opposite is typically * true, however, when handling ByteBuffer from withint the unmarshallers of the * low-level clients. */ public static byte[] copyAllBytesFrom(ByteBuffer bb) { if (bb == null) { return null; } if (bb.hasArray()) { return Arrays.copyOfRange(bb.array(), bb.arrayOffset(), bb.arrayOffset() + bb.limit()); } ByteBuffer copy = bb.asReadOnlyBuffer(); copy.rewind(); byte[] dst = new byte[copy.remaining()]; copy.get(dst); return dst; } /** * Returns a copy of the bytes from the given ByteBuffer, ranging from the the * buffer's current position to the buffer's limit; or null if the input is null. *

* The internal states of the given byte buffer will be restored when this method completes * execution. *

* When handling ByteBuffer from user's input, it's typical to call the * {@link #copyBytesFrom(ByteBuffer)} instead of {@link #copyAllBytesFrom(ByteBuffer)} so as to * account for the position of the input ByteBuffer. The opposite is typically * true, however, when handling ByteBuffer from withint the unmarshallers of the * low-level clients. */ public static byte[] copyBytesFrom(ByteBuffer bb) { if (bb == null) { return null; } if (bb.hasArray()) { return Arrays.copyOfRange(bb.array(), bb.arrayOffset() + bb.position(), bb.arrayOffset() + bb.limit()); } byte[] dst = new byte[bb.remaining()]; bb.asReadOnlyBuffer().get(dst); return dst; } }





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