ASP.NET ViewState Decoder C++ class

I need a STL C++ class that will decode ASP.NET ViewState data to an XML. The provided class must support both; asp.net 1.1 and 2.0 versions Here is an example of such tool: [login to view URL] And a good article about it: [login to view URL] The C++ class must provide following interface. class ViewStateDecoder { public: bool DecodeHTML(const string& html, string& xml); bool DecodeString(const string& str, string& xml); ... helper hunctions } the first method extracts '__VIEWSTATE' from provided HTML, the second receives VIEWSTATE in a string. Both methods return false in case of error.