utils/src/main/java/com/cloud/utils/compression/CompressionUtil.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 com.cloud.utils.compression;

import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

public class CompressionUtil {

    protected Logger logger = LogManager.getLogger(getClass());

    public byte[] compressString(String inputStr) throws IOException {
        ByteArrayOutputStream obj = new ByteArrayOutputStream();
        GZIPOutputStream gzip = new GZIPOutputStream(obj);
        gzip.write(inputStr.getBytes(StandardCharsets.UTF_8));
        gzip.close();
        return obj.toByteArray();
    }

    public String decompressByteArary(byte[] compressed) throws IOException {
        GZIPInputStream gis = new GZIPInputStream(new ByteArrayInputStream(compressed));
        BufferedReader bf = new BufferedReader(new InputStreamReader(gis, StandardCharsets.UTF_8));
        String line = bf.readLine();
        StringBuilder builder = new StringBuilder();
        while (line != null) {
            builder.append(line);
            line = bf.readLine();
            if (line != null) {
                builder.append("\n");
            }
        }
        return builder.toString();
    }
}