xhj/embeded-gateway: 网关代码

xhj 4d99525703 first commit		6 月之前
..
chainbuf.hpp	4d99525703 first commit	6 月之前
direct_streambuf.hpp	4d99525703 first commit	6 月之前
indirect_streambuf.hpp	4d99525703 first commit	6 月之前
linked_streambuf.hpp	4d99525703 first commit	6 月之前