ZeroCopyOutputStream into a streambuf

I would like to write a class that inherites from streambuf and adapts a ZeroCopyOutputStream (开发者_如何学Cgoogle/protobuf/io/) into a streambuf.

any ideas?

1. write a proto description file and compile it to c++ code using protoc
2. the generated c++ class has functions to read/write to stream: SerializeToOstream(ostream* stream) and ParseFromIstream(istream* stream)

You may need to create iostream from streambuf by yourself.