Gzip.java

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;

interface Gzip {

  static byte[] compress(String data) throws IOException {
    try (ByteArrayOutputStream bos = new ByteArrayOutputStream(data.length())) {
      try (GZIPOutputStream gzip = new GZIPOutputStream(bos)) {
        gzip.write(data.getBytes(StandardCharsets.UTF_8));
      }
      return bos.toByteArray();
    }
  }

  static String decompress(byte[] compressed) throws IOException {
    final var sb = new StringBuilder();
    try (ByteArrayInputStream bis = new ByteArrayInputStream(compressed);
         GZIPInputStream gis = new GZIPInputStream(bis);
         BufferedReader br = new BufferedReader(new InputStreamReader(gis, StandardCharsets.UTF_8))) {
      String line;
      while ((line = br.readLine()) != null) {
        sb.append(line);
      }
    }
    return sb.toString();
  }

}