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/*******************************************************************************
 * Copyright (c) 2017-2021, org.smartboot. All rights reserved.
 * project name: smart-http
 * file name: GzipUtils.java
 * Date: 2021-07-12
 * Author: sandao ([email protected])
 ******************************************************************************/

package org.smartboot.http.common.utils;

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

/**
 * @author 三刀（[email protected]）
 * @version V1.0 , 2021/7/12
 */
public class GzipUtils {
    public static final String GZIP_ENCODE_UTF_8 = "UTF-8";
    public static final String GZIP_ENCODE_ISO_8859_1 = "ISO-8859-1";


//    public static byte[] compress(String str, String encoding) {
//        if (str == null || str.length() == 0) {
//            return null;
//        }
//        return compress(str.getBytes(encoding));
//    }

    public static byte[] compress(byte[] data, int offset, int length) {
        return compress(data, offset, length, GZIP_ENCODE_UTF_8);
    }

    public static byte[] compress(byte[] data, int offset, int length, String encoding) {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        GZIPOutputStream gzip;
        try {
            gzip = new GZIPOutputStream(out);
            gzip.write(data, offset, length);
            gzip.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return out.toByteArray();
    }

//    public static byte[] compress(String str) throws IOException {
//        return compress(str, GZIP_ENCODE_UTF_8);
//    }

    public static byte[] uncompress(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 (Exception e) {
            e.printStackTrace();
        }
        return out.toByteArray();
    }

    public static String uncompressToString(byte[] bytes, String encoding) {
        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);
            }
            return out.toString(encoding);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static String uncompressToString(byte[] bytes) {
        return uncompressToString(bytes, GZIP_ENCODE_UTF_8);
    }


}