docs: private byte[] readContent( ZipInputStream zipInputStream ) throws IOException {
          int bufferLength = 1024;
          byte[] buffer = new byte[bufferLength];
          int n;
          ByteArrayOutputStream baout = new ByteArrayOutputStream();
          while ((n = zipInputStream.read(buffer, 0, bufferLength)) > -1) {
              baout.write(buffer, 0, n);
          }
          return baout.toByteArray();
      }