#define HH_SENF_Packets_GenericTLV_ 1
// Custom includes
+#include <boost/ptr_container/ptr_map.hpp>
#include <senf/Packets/Packets.hh>
#include <senf/Utils/type_traits.hh>
+#include <senf/Utils/singleton.hh>
//#include "GenericTLV.hh.mpp"
///////////////////////////////hh.p////////////////////////////////////////
namespace senf {
+ /** \brief Base class for generic TLV parsers
+
+ This abstract base class can be used to define generic TLV parsers. The following
+ class structure is assumed:
+ \image html GenericTLV.png
+
+ Your TLVParser base class has to define a \c type and a \c length field:
+ \code
+ struct MyTLVParserBase : public senf::PacketParserBase
+ {
+ # include SENF_PARSER()
+ SENF_PARSER_FIELD ( type, senf::UInt8Parser );
+ SENF_PARSER_FIELD_RO ( length, senf::UInt8Parser );
+ SENF_PARSER_FINALIZE ( MyTLVParserBase );
+ };
+ \endcode
+
+ Your concrete TLV parsers will inherit from this base class and have to define a specific
+ value field and a \c typeId member:
+ \code
+ struct MyConcreteTLVParser : public MyTLVParserBase
+ {
+ # include SENF_PARSER()
+ SENF_PARSER_INHERIT ( MyTLVParserBase );
+ SENF_PARSER_FIELD ( myValue, senf::UInt32Parser );
+ SENF_PARSER_FINALIZE ( MyConcreteTLVParser );
+
+ SENF_PARSER_INIT() {
+ type() = typeId;
+ length_() = 4;
+ }
+ static const type_t::value_type typeId = 0x42;
+ };
+ \endcode
+
+ With GenericTLVParserBase you can define a generic parser class which provides
+ members to access the value data and and to cast the parser to a concrete tlv
+ parser:
+ \code
+ struct MyGenericTLVParser : public senf::GenericTLVParserBase<MyTLVParserBase>
+ {
+ typedef senf::GenericTLVParserBase<MyTLVParserBase> base;
+ MyGenericTLVParser(data_iterator i, state_type s) : base(i,s) {}
+
+ // members for your generic TLV parser...
+ };
+ \endcode
+
+ If your generic TLV parser just inherits from GenericTLVParserBase and doesn't
+ add any additional functionality you can use a simple \c typedef as well:
+ \code
+ typedef senf::GenericTLVParserBase<MyTLVParserBase> MyGenericTLVParser;
+ \endcode
+
+ This generic tlv parser can now be used for example in a list:
+ \code
+ class MyTestPacketParser : public senf::PacketParserBase
+ {
+ # include SENF_PARSER()
+ SENF_PARSER_FIELD_RO ( list_length, senf::UInt8Parser );
+ SENF_PARSER_LIST ( tlv_list, list_length, MyGenericTLVParser );
+ SENF_PARSER_FINALIZE ( MyTestPacketParser );
+ };
+ \endcode
+
+ Now, you can access the TLV parsers in the list in a generic way or you
+ can cast the parsers to some concrete tlv parser:
+ \code
+ MyTestPacket p (...
+ typedef MyTestPacket::Parser::tlv_list_t::container container_t;
+ container_t tlvContainer (p->tlv_list() );
+ optContainer_t::iterator listIter (tlvContainer.begin());
+
+ // listIter points to a MyGenericTLVParser, so you have generic access:
+ listIter->type() = 0x42;
+ listIter->value( someRangeOfValueData);
+
+ // cast to an instance of MyConcreteTLVParser:
+ if (listIter->is<MyConcreteTLVParser>()) {
+ MyConcreteTLVParser concreteTLVParser ( listIter->as<MyConcreteTLVParser>());
+ concreteTLVParser.myValue() = 0xabababab;
+ }
+
+ // add a MyConcreteTLV to the list:
+ MyConcreteTLVParser tlv ( tlvContainer.push_back_space().init<MyConcreteTLVParser>());
+ tlv.myValue() = 0xffff;
+ \endcode
+
+ \see
+ IPv6GenericOptionParser, WLANGenericInfoElementParser, MIHGenericTLVParser \n
+ GenericTLVParserRegistry
+ */
template <class Base>
class GenericTLVParserBase : public Base
{
Parser init();
template <class Parser>
- Parser as();
+ Parser as() const;
template <class Parser>
- bool is();
+ bool is() const;
senf::PacketInterpreterBase::range value() const;
+ void dump(std::ostream & os) const;
+
+#ifndef DOXYGEN
template<class ForwardReadableRange>
void value(ForwardReadableRange const & val,
typename boost::disable_if<senf::is_pair<ForwardReadableRange> >::type * = 0);
template <class Type, class ForwardReadableRange>
void value(std::pair<Type, ForwardReadableRange> const & val,
typename boost::enable_if<boost::is_convertible<Type, typename Base::type_t::value_type> >::type * = 0);
-
+#else
+ template<class ForwardReadableRange>
+ void value(ForwardReadableRange const & val);
+
+ template <class ForwardReadableRange>
+ void value(std::pair<typename Base::type_t::value_type, ForwardReadableRange> const & val);
+#endif
+
private:
template<class ForwardReadableRange>
void value_(ForwardReadableRange const &range);
+
+ Base & self();
+ Base const & self() const;
};
-}
+
+
+ namespace detail {
+ template <class BaseParser>
+ struct GenericTLVParserRegistry_EntryBase {
+ virtual void dump(GenericTLVParserBase<BaseParser> const & parser, std::ostream & os) const = 0;
+ };
+
+ template <class BaseParser, class Parser>
+ struct GenericTLVParserRegistry_Entry
+ : GenericTLVParserRegistry_EntryBase<BaseParser>
+ {
+ virtual void dump(GenericTLVParserBase<BaseParser> const & parser, std::ostream & os) const;
+ };
+ }
+
+ /** \brief TLV parser registration facility
+
+ The %GenericTLVParserRegistry provides a generic facility to globally register concrete
+ TLV parser by the type value. The concrete TLV parser must therefore provide a \c typeId
+ member. See GenericTLVParserBase for details about the assumed class structure.
+
+ Every registry is identified by the base tlv parser class. Parsers can be registered
+ statically only:
+ \code
+ GenericTLVParserRegistry<MyTLVParserBase>::RegistrationProxy<ConcreteTLVParser>
+ registerConcreteTLVParser;
+ \endcode
+ This global variable declaration will register ConcreteTLVParser. The variable
+ registerConcreteTLVParser is a dummy. It's only function is to force the call of
+ it's constructor during global construction time. This static registration only
+ works when the symbol is included into the final binary.
+
+ To simplify the registration the \ref SENF_PACKET_TLV_REGISTRY_REGISTER macro can be used.
+ The \c ConreteTLVParser must therefore provide a \c Registry typedef pointing to the
+ %GenericTLVParserRegistry; typically you put this typedef to the TLVBaseParser class.
+ \code
+ struct MyTLVParserBase : public senf::PacketParserBase
+ {
+ ...
+ typedef GenericTLVParserRegistry<MyTLVParserBase> Registry;
+ };
+ struct MyConcreteTLVParser : public MyTLVParserBase
+ {
+ ....
+ static const type_t::value_type typeId = 0x42;
+ void dump(std::ostream & os) const;
+ };
+
+ // register MyConcreteTLVParser to the MyTLVParserBase-Registry with the type id 0x42:
+ SENF_PACKET_TLV_REGISTRY_REGISTER( MyConcreteTLVParser );
+ \endcode
+
+ The registry provides a dump() member to dump an instance of a generic TLV parser.
+ If the type value of the given TLV parser is registered the generic tlv will be
+ casted to the registered concrete TLV parser and the dump member from this parser
+ will be called. Otherwise the generic TLV parser will be dumped in a generic way
+ (hexdump of the value).
+
+ \see
+ GenericTLVParserBase for the general TLV class structure \n
+ IPv6OptionParser::Registry, WLANInfoElementParser::Registry,
+ MIHBaseTLVParser::Registry
+ */
+ template <class BaseParser>
+ class GenericTLVParserRegistry
+ : public senf::singleton<GenericTLVParserRegistry<BaseParser> >
+ {
+ typedef boost::ptr_map<
+ typename BaseParser::type_t::value_type,
+ detail::GenericTLVParserRegistry_EntryBase<BaseParser> > Map;
+ Map map_;
+
+ GenericTLVParserRegistry() {};
+ public:
+ using senf::singleton<GenericTLVParserRegistry<BaseParser> >::instance;
+ friend class senf::singleton<GenericTLVParserRegistry<BaseParser> >;
+
+ template <class PacketParser>
+ struct RegistrationProxy {
+ RegistrationProxy();
+ };
+ template <typename Parser>
+ void registerParser();
+
+ void dump(GenericTLVParserBase<BaseParser> const & parser, std::ostream & os) const;
+ };
+
+ /** \brief Statically add an entry to a TLV parser registry
+
+ This macro will declare an anonymous global variable in such a way, that constructing
+ this variable will register the given tlv parser.
+
+ \hideinitializer
+ \see senf::GenericTLVParserRegistry
+ */
+# define SENF_PACKET_TLV_REGISTRY_REGISTER( ConreteTLVParser ) \
+ namespace { \
+ ConreteTLVParser::Registry::RegistrationProxy<ConreteTLVParser> \
+ BOOST_PP_CAT(tlvparserRegistration_, __LINE__); \
+ }
+
+}
///////////////////////////////hh.e////////////////////////////////////////
//#include "GenericTLV.cci"
projects / senf.git / blobdiff