curator-framework/src/main/java/org/apache/curator/framework/imps/GzipCompressionProvider.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.curator.framework.imps;

import org.apache.curator.framework.api.CompressionProvider;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

public class GzipCompressionProvider implements CompressionProvider
{
    @Override
    public byte[] compress(String path, byte[] data) throws Exception
    {
        ByteArrayOutputStream       bytes = new ByteArrayOutputStream();
        GZIPOutputStream            out = new GZIPOutputStream(bytes);
        out.write(data);
        out.finish();
        return bytes.toByteArray();
    }

    @Override
    public byte[] decompress(String path, byte[] compressedData) throws Exception
    {
        ByteArrayOutputStream       bytes = new ByteArrayOutputStream(compressedData.length);
        GZIPInputStream             in = new GZIPInputStream(new ByteArrayInputStream(compressedData));
        byte[]                      buffer = new byte[compressedData.length];
        for(;;)
        {
            int     bytesRead = in.read(buffer, 0, buffer.length);
            if ( bytesRead < 0 )
            {
                break;
            }
            bytes.write(buffer, 0, bytesRead);
        }
        return bytes.toByteArray();
    }
}