该IDL源代码，主要功能是，实现基于Socket的ftp通讯程序，稍微修改，即可实现数据自动下载服务。-The IDL source code, the main function is to achieve based on the Socket ftp Communications program, slightly modified, you can achieve automatic data download service.

对数据进行压缩和解压缩，压缩比例达4：1，具有自动测试功能，很好(Compression and decompression of the data, the compression ratio of 4:1, with automatic test function, very good)