package net.droidtech.utils;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

public class GZIP {
	
	private GZIP(){
		
	}
	public static byte[] compress(byte[] data) {  
        ByteArrayOutputStream out = new ByteArrayOutputStream();  
        GZIPOutputStream gzip;  
        try {  
            gzip = new GZIPOutputStream(out);  
            gzip.write(data);  
            gzip.close();  
        } catch (IOException e) {
            e.printStackTrace();
            return null;  
        }  
        return out.toByteArray();  
    }  
	
	public static byte[] decompress(byte[] bytes) {  
        if (bytes == null || bytes.length == 0) {  
            return null;  
        }  
        ByteArrayOutputStream out = new ByteArrayOutputStream();  
        ByteArrayInputStream in = new ByteArrayInputStream(bytes);  
        try {  
            GZIPInputStream ungzip = new GZIPInputStream(in);  
            byte[] buffer = new byte[256];  
            int n;  
            while ((n = ungzip.read(buffer)) >= 0) {  
                out.write(buffer, 0, n);  
            }  
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
        return out.toByteArray();
	}

}