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package com.mogudiandian.util.compressor;

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

/**
 * GZIP压缩器
 * @author Joshua Sun
 * @since 1.0.0
 */
public final class GzipCompressor implements Compressor {

    public byte[] compress(byte[] bytes) {
        try (ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
             GZIPOutputStream gzipOutputStream = new GZIPOutputStream(byteArrayOutputStream)) {
            gzipOutputStream.write(bytes);
            gzipOutputStream.finish();
            return byteArrayOutputStream.toByteArray();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public byte[] decompress(byte[] bytes) {
        try (ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(bytes);
             GZIPInputStream gzipInputStream = new GZIPInputStream(byteArrayInputStream);
             ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream()) {
            byte[] buf = new byte[4096];
            for (int len; (len = gzipInputStream.read(buf)) >= 0; ) {
                byteArrayOutputStream.write(buf, 0, len);
            }
            return byteArrayOutputStream.toByteArray();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

}