code: public static byte[] zlib(InputStream in, int level, int length) {
  		final ByteArrayOutputStream out = new ByteArrayOutputStream(length);
  		deflater(in, out, level);
  		return out.toByteArray();
  	}
docs: 打成Zlib压缩包
  
  @param in 数据流
  @param level 压缩级别，0~9
  @param length 预估大小
  @return 压缩后的bytes
  @since 4.1.19