code: public static byte[] unZlib(InputStream in, int length) {
  		final ByteArrayOutputStream out = new ByteArrayOutputStream(length);
  		inflater(in, out);
  		return out.toByteArray();
  	}
docs: 解压缩zlib
  
  @param in 数据流
  @param length 预估长度
  @return 解压后的bytes
  @since 4.1.19