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package eleme.openapi.sdk.media.utils;

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

/**
 * Created by huamulou on 15/12/10.
 */
public class CompressUtils {


    public static byte[] compress(byte[] input) {
        ByteArrayInputStream inputStream = new ByteArrayInputStream(input);
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        try {
            compress(inputStream, outputStream);
        } catch (IOException e) {
            return null;
        }
        return outputStream.toByteArray();
    }

    public static void compress(InputStream is, OutputStream os)
            throws IOException {

        GZIPOutputStream gos = new GZIPOutputStream(os);
        int count;
        byte data[] = new byte[1024];
        while ((count = is.read(data, 0, 1024)) != -1) {
            gos.write(data, 0, count);
        }
        gos.finish();
        gos.flush();
        gos.close();
    }


    public static void decompress(InputStream is, OutputStream os)
            throws IOException {

        GZIPInputStream gis = new GZIPInputStream(is);

        int count;
        byte data[] = new byte[1024];
        while ((count = gis.read(data, 0, 1024)) != -1) {
            os.write(data, 0, count);
        }

        gis.close();
    }

    public static byte[] decompress(byte[] input) {
        ByteArrayInputStream inputStream = new ByteArrayInputStream(input);
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        try {
            decompress(inputStream, outputStream);
        } catch (IOException e) {
            return null;
        }
        return outputStream.toByteArray();
    }

}