4 // Fraunhofer Institute for Open Communication Systems (FOKUS)
5 // Competence Center NETwork research (NET), St. Augustin, GERMANY
6 // Stefan Bund <g0dil@berlios.de>
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 2 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the
20 // Free Software Foundation, Inc.,
21 // 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 \brief Packet public header */
26 #ifndef HH_SENF_Packets_Packet_
27 #define HH_SENF_Packets_Packet_ 1
30 #include <boost/operators.hpp>
31 #include <boost/utility.hpp>
32 #include <boost/type_traits/is_integral.hpp>
33 #include <senf/Utils/Tags.hh>
34 #include <senf/Utils/safe_bool.hh>
35 #include "PacketInterpreter.hh"
37 //#include "Packet.mpp"
38 ///////////////////////////////hh.p////////////////////////////////////////
42 /** \defgroup packet_module Packet Handling
44 The basic groundwork of the %Packet library is the packet handling:
46 \li The packet classes provide access to a chain of packet headers (more generically called
48 \li They automatically manage the required memory resources and the shared packet data.
50 \section packet_module_chain The Interpreter Chain
52 The central data structure for a packet is the interpreter chain
54 \image html structure.png The Interpreter Chain
56 This image depicts a packet with several headers. Each interpreter is responsible for a
57 specific sub-range of the complete packet. This range always \e includes the packets payload
58 (This is, why we call the data structure interpreter and not header: The interpreter is
59 responsible for interpreting a range of the packet according to a specific protocol), the
60 packet interpreters are nested inside each other.
62 For each interpreter, this structure automatically divides the packet into three areas (each
63 of which are optional): The header, the payload and the trailer. Every packet will have
64 either a header or a payload section while most don't have a trailer.
66 As user of the library you always interact with the chain through one (or more) of the
67 interpreters. The interpreter provides methods to traverse to the following or preceding
68 header (interpreter) and provides two levels of access to the packet data: Generic low-level
69 access in the form of an STL compatible sequence and access to the parsed fields which are
70 provided by the parser associated with the concrete packet type.
72 \section packet_module_management Resource Management
74 The interface to the packet library is provided using a handle class (\ref Packet for
75 generic, protocol agnostic access and \ref ConcretePacket derived from \ref Packet to access
76 a specific protocol). This handle automatically manages the resources associated with the
77 packet (the interpreter chain and the data storage holding the packet data). The resources
78 are automatically released when the last packet handle referencing a specific packet is
81 \implementation The packet chain is provided on two levels: The internal representation \ref
82 PacketInterpreterBase and \ref PacketInterpreter which are referenced by the Handle
83 classes \ref Packet and \ref ConcretePacket. \n
84 The internal representation classes are pertinent in the sense, that they exist
85 regardless of the existence of a handle referencing them (as long as the packet
86 exists). Still the interpreter chain is lazy and packet interpreters beside the first
87 are only created dynamically when accessed (this is implemented in the handle not in the
88 internal representation). \n
89 The packet interpreters make use of a pool allocator. This provides extremely efficient
90 creation and destruction of packet interpreter's and removes the dynamic memory
91 management overhead from the packet interpreter management. The packet implementation
92 class (\ref PacketImpl which holds the packet data itself) however is still dynamically
93 managed (however there is only a single instance for each packet).
96 template <class PackeType> class ConcretePacket;
98 ///\addtogroup packet_module
101 /** \brief Main %Packet class
103 %Packet is the main externally visible class of the packet library. %Packet is a handle into
104 the internal packet representation. From %Packet you may access the data of that specific
105 sub-packet/header/interpreter and navigate to the neighboring
106 sub-packets/headers/interpreters.
108 %Packet is protocol agnostic. This class only provides non-protocol dependent members. To
109 access the protocol specific features of a packet (like header fields) the ConcretePacket
110 class extending %Packet is provided.
112 \section packet_semantics Semantics
114 All operations accessing the data of \c this packet in some way will ignore any preceding
115 packets/headers/interpreters in the chain. It does not matter, whether a given packet is
116 taken from the middle or the beginning of the chain, all operations (except those explicitly
117 accessing the chain of course) should work the same.
119 This especially includes members like clone() or append(): clone() will clone \e only from
120 \c this packet until the end of the chain, append() will append the given packet \e ignoring
121 any possibly preceding packets/headers/interpreters.
123 In the same way, the data() member provides an STL-sequence compatible view of the packet
124 data. This only includes the data which is part of \c this packet including header, trailer
125 \e and payload but \e not the headers or trailers of packets \e before \c this packet in the
126 packet/header/interpreter chain (nonetheless, this data overlaps with the data of other
129 Several members are member templates taking an \a OtherPacket template parameter. This
130 parameter must be the ConcretePacket instantiation associated with some concrete packet type
131 (protocol). For each implemented protocol, typedefs should be provided for these
132 instantiations (Example: \ref EthernetPacket is a typedef for
133 \ref ConcretePacket < \ref EthernetPacketType >).
136 \ref ConcretePacket for the %type specific interface\n
137 \ref PacketData for the sequence interface\n
138 \ref packetparser for a specification of the parser interface
141 : public safe_bool<Packet>,
142 public boost::equality_comparable<Packet>
145 ///////////////////////////////////////////////////////////////////////////
148 typedef void type; ///< Type of the packet.
149 typedef senf::detail::packet::size_type size_type;
150 ///< Unsigned type to represent packet size
151 typedef PacketInterpreterBase::factory_t factory_t; ///< Packet factory type (see below)
153 ///////////////////////////////////////////////////////////////////////////
154 ///\name Structors and default members
157 // default copy constructor
158 // default copy assignment
159 // default destructor
161 Packet(); ///< Create uninitialized packet handle
162 /**< An uninitialized handle is in - valid(). It does not
163 allow any operation except assignment and checking for
165 Packet clone() const; ///< Create copy packet
166 /**< clone() will create a complete copy of \c this
167 packet. The returned packet will have the same data and
168 packet chain. It does however not share any data with
169 the original packet. */
171 // conversion constructors
173 template <class PacketType>
174 Packet(ConcretePacket<PacketType> const & packet);
175 ///< Copy-construct Packet from ConcretePacket
176 /**< This constructor allows to convert an arbitrary
177 ConcretePacket into a general Packet, loosing the
178 protocol specific interface. */
181 ///////////////////////////////////////////////////////////////////////////
183 ///\name Interpreter chain access
186 Packet next() const; ///< Get next packet in chain
187 /**< \throws InvalidPacketChainException if no next packet
189 Packet next(NoThrow_t) const; ///< Get next packet in chain
190 /**< \returns in - valid() packet if no next packet
192 template <class OtherPacket> OtherPacket next() const;
193 ///< Get next packet in chain and cast to \a OtherPacket
194 /**< \throws std::bad_cast if the next() packet is not of
196 \throws InvalidPacketChainException if no next packet
198 template <class OtherPacket> OtherPacket next(NoThrow_t) const;
199 ///< Get next packet in chain and cast to \a OtherPacket
200 /**< \returns in - valid() packet if no next packet
201 exists or if next() packet is not of
202 type \a OtherPacket */
203 template <class OtherPacket> OtherPacket find() const;
204 ///< Search chain forward for packet of type \a OtherPacket
205 /**< The search will start with the current packet.
206 \throws InvalidPacketChainException if no packet of
207 type \a OtherPacket can be found. */
208 template <class OtherPacket> OtherPacket find(NoThrow_t) const;
209 ///< Search chain forward for packet of type \a OtherPacket
210 /**< The search will start with the current packet.
211 \returns in - valid() packet if no packet of type \a
212 OtherPacket can be found. */
214 Packet prev() const; ///< Get previous packet in chain
215 /**< \throws InvalidPacketChainException if no previous
217 Packet prev(NoThrow_t) const; ///< Get previous packet in chain
218 /**< \returns in - valid() packet if no previous packet
220 template <class OtherPacket> OtherPacket prev() const;
221 ///< Get previous packet in chain and cast to \a OtherPacket
222 /**< \throws std::bad_cast, if the previous packet is not of
224 \throws InvalidPacketChainException if no previous
226 template <class OtherPacket> OtherPacket prev(NoThrow_t) const;
227 ///< Get previous packet in chain and cast to \a OtherPacket
228 /**< \returns in - valid() packet if no previous packet
229 exists or if the previous packet is not of
230 type \a OtherPacket */
231 template <class OtherPacket> OtherPacket rfind() const;
232 ///< Search chain backwards for packet of type \a OtherPacket
233 /**< The search will start with the current packet.
234 \throws InvalidPacketChainException if no packet of
235 type \a OtherPacket can be found. */
236 template <class OtherPacket> OtherPacket rfind(NoThrow_t) const;
237 ///< Search chain backwards for packet of type \a OtherPacket
238 /**< The search will start with the current packet.
239 \returns in - valid() packet if no packet of type \a
240 OtherPacket can be found. */
243 Packet first() const; ///< Return first packet in chain
244 template <class OtherPacket> OtherPacket first() const;
245 ///< Return first packet in chain and cast
246 /**< \throws std::bad_cast if the first() packet is not of
247 type \a OtherPacket */
249 Packet last() const; ///< Return last packet in chain
250 template <class OtherPacket> OtherPacket last() const;
251 ///< Return last packet in chain and cast
252 /**< \throws std::bad_cast if the last() packet is not of
253 type \a OtherPacket */
256 template <class OtherPacket> OtherPacket parseNextAs() const;
257 ///< Interpret payload of \c this as \a OtherPacket
258 /**< parseNextAs() will throw away the packet chain after
259 the current packet if necessary. It will then parse the
260 payload section of \c this packet as given by \a
261 OtherPacket. The new packet is added to the chain after
263 \returns new packet instance sharing the same data and
264 placed after \c this packet in the chain.
265 \throws InvalidPacketChainException if no next packet
266 header is allowed (viz. nextPacketRange() of the
267 the current PacketType returns no_range() ) */
268 Packet parseNextAs(factory_t factory) const;
269 ///< Interpret payload of \c this as \a factory type packet
270 /**< parseNextAs() will throw away the packet chain after
271 the current packet if necessary. It will then parse the
272 payload section of \c this packet as given by \a
273 factory. The new packet is added to the chain after
275 \returns new packet instance sharing the same data and
276 placed after \c this packet in the chain.
277 \throws InvalidPacketChainException if no next packet
278 header is allowed (viz. nextPacketRange() of the
279 the current PacketType returns no_range() ) */
281 template <class OtherPacket> bool is() const;
282 ///< Check, whether \c this packet is of the given type
283 template <class OtherPacket> OtherPacket as() const;
284 ///< Cast current packet to the given type
285 /**< This operations returns a handle to the same packet
286 header/interpreter however upcast to the given
287 ConcretePacket type which have been instantiated
289 \throws std::bad_cast if the current packet is not of
290 type \a OtherPacket */
291 template <class OtherPacket> OtherPacket as(NoThrow_t) const;
292 ///< Cast current packet to the given type
293 /**< This operations returns a handle to the same packet
294 header/interpreter however upcast to the given
295 ConcretePacket type which have been instantiated
297 \warning You must make absolutely sure that the packet
298 is of the given type. If not, calling this member
299 crashes your program in a unkindly way. */
301 Packet append(Packet const & packet) const; ///< Append the given packet to \c this packet
302 /**< This operation will replace the payload section of \c
303 this packet with \a packet. This operation will replace
304 the packet chain after \c this packet with a clone of
305 \a packet and will replace the raw data of the payload
306 of \c this with the raw data of \a packet. \c this
307 packet will not share any data with \a packet.
308 \returns Packet handle to the cloned \a packet, placed
309 after \c this in the packet/header/interpreter
317 PacketData & data() const; ///< Access the packets raw data container
318 size_type size() const; ///< Return size of packet in bytes
319 /**< This size does \e not include the size of any preceding
320 headers/packets/interpreters. It does however include
321 \c this packets payload. */
328 template <class Annotation>
329 Annotation & annotation(); ///< Get packet annotation
330 /**< This member will retrieve an arbitrary packet
331 annotation. Every annotation is identified by a unique
332 \a Annotation type. This type should \e always be a \c
336 struct MyAnnotation {
340 senf::Packet p (...);
342 p.annotation<MyAnnotation>().value = 1;
345 Annotations are shared by all headers / interpreters
346 within a single packet chain.
348 If an annotation is \e not a POD type (more
349 specifically, if it's constructor or destructor is not
350 trivial including base classes and members), the \a
351 Annotation type \e must inherit from
352 senf::ComplexAnnotation. Failing to follow this rule
353 will result in undefined behavior and will probably
354 lead to a program crash.
357 struct MyStringAnnotation : senf::ComplexAnnotation {
361 (This type is not POD since \c std::string is not POD)
363 \see \ref packet_usage_annotation
365 \implementation The annotation system is implemented
366 quite efficiently since annotations are stored
367 within a packet embedded vector of fixed size (the
368 size is determined automatically at runtime by the
369 number of different annotations
370 used). Additionally, non-complex small annotations
371 require no additional memory management (\c new /
374 \idea Pool the annotation vectors: In the destructor
375 swap the vector into a vector graveyard (swapping
376 two vectors is an O(1) no allocation operation). In
377 the constructor, if there is a vector in the
378 graveyard, swap it in from there. Of course, it
379 would be better to do away with the vector and just
380 allocate the space together with the packet but
381 that looks quite complicated to do ... especially
382 considering that the packetimpl itself uses a pool.
387 template <class Annotation>
388 Annotation const & annotation() const; ///< Get packet annotation
389 /**< \see annotation() */
391 ///\name Other methods
394 bool operator==(Packet const & other) const; ///< Check for packet identity
395 /**< Two packet handles compare equal if they really are the
396 same packet header in the same packet chain. */
397 bool boolean_test() const; ///< Check, whether the packet is valid()
399 bool valid() const; ///< Check, whether the packet is valid()
400 /**< An in - valid() packet does not allow any operation
401 except checking for validity and assignment. in -
402 valid() packets serve the same role as 0-pointers.
404 This is an alias for boolean_test() which is called
405 when using a packet in a boolean context. */
407 void finalizeThis(); ///< Update calculated fields
408 /**< The finalize() family of members will update
409 calculated packet fields: checksums, size fields and so
410 on. This includes any field, which can be set from
411 other information in the packet. Each concrete packet
412 type should document, which fields are set by
415 finalizeThis() will \e only process the current
416 header. Even if only changing fields in this protocol,
417 depending on the protocol it may not be enough to
418 finalize this header only. See the packet type
421 template <class Other>
422 void finalizeTo(); ///< Update calculated fields
423 /**< The finalize() family of members will update
424 calculated packet fields: checksums, size fields and so
425 on. This includes any field, which can be set from
426 other information in the packet. Each concrete packet
427 type should document, which fields are set by
430 finalizeTo() will automatically process all
431 packets/headers/interpreters from the \e first
432 occurrence of packet type \a Other (beginning at \c
433 this packet searching forward towards deeper nested
434 packets) backwards up to \c this.
436 This call is equivalent to
438 p.finalizeTo(p.next<Other>())
441 void finalizeTo(Packet const & other); ///< Update calculated fields
442 /**< The finalize() family of members will update
443 calculated packet fields: checksums, size fields and so
444 on. This includes any field, which can be set from
445 other information in the packet. Each concrete packet
446 type should document, which fields are set by
449 finalizeTo(other) will automatically process all
450 packets/headers/interpreters beginning at \a other
451 backwards towards outer packets up to \c this. */
453 void finalizeAll(); ///< Update calculated fields
454 /**< The finalize() fammily of members will update
455 calculated packet fields: checksums, size fields and so
456 on. This includes any field, which can be set from
457 other information in the packet. Each concrete packet
458 type should document, which fields are set by
461 finalizeAll() will automatically process all
462 packets/headers/interpreters from the end of the chain
463 (the most inner packet) backwards up to \c this.
465 This call is equivalent to
467 p.finalizeTo(p.last())
470 Beware, that finalizeAll() will \e not finalize any
471 headers before \c this, it will \e only process inner
474 void dump(std::ostream & os) const; ///< Write out a printable packet representation
475 /**< This method is provided mostly to help debugging packet
476 problems. Each concrete packet should implement a dump
477 method writing out all fields of the packet in a
478 readable representation. dump() will call this member
479 for each packet/header/interpreter in the chain from \c
480 this packet up to the end of the chain. */
482 TypeIdValue typeId() const; ///< Get type of \c this packet
483 /**< This value is used e.g. in the packet registry to
484 associate packet types with other information.
485 \returns A type holding the same information as a
486 type_info object, albeit assignable */
487 factory_t factory() const; ///< Return factory instance of \c this packet
488 /**< The returned factory instance can be used to create new
489 packets of the given type without knowing the concrete
490 type of the packet. The value may be stored away for
491 later use if needed. */
493 unsigned long id() const; ///< Unique packet id
494 /**< Get a unique packet id. If two packets have the same
495 id, they share the internal data representation. */
497 bool is_shared() const; ///< check if this packet shares data with any another packet handle.
498 /**< This method returns true if there is any other packet
499 handle pointing to any header in the packet chain. */
504 explicit Packet(PacketInterpreterBase::ptr const & packet);
506 PacketInterpreterBase::ptr const & ptr() const;
509 Packet getNext() const;
510 Packet getLast() const;
512 PacketInterpreterBase::ptr packet_;
514 template <class PacketType>
515 friend class ConcretePacket;
516 friend class PacketParserBase;
519 /** \brief Protocol specific packet handle
521 The ConcretePacket template class extends Packet to provide protocol/packet type specific
522 aspects. These are packet constructors and access to the parsed packet fields.
524 The \c PacketType template argument to ConcretePacket is a protocol specific and internal
525 policy class which defines the protocol specific behavior. To access a specific type of
526 packet, the library provides corresponding typedefs of ConcretePacket < \a SomePacketType >
527 (e.g. \ref EthernetPacket as typedef for \ref ConcretePacket < \ref EthernetPacketType >).
529 The new members provided by ConcretePacket over packet are mostly comprised of the packet
530 constructors. These come in three major flavors:
532 \li The create() family of constructors will create completely new packets.
533 \li The createAfter() family of constructors will create new packets (with new data for the
534 packet) \e after a given existing packet <em>thereby destroying and overwriting any
535 possibly existing packets and data after the given packet</em>.
536 \li The createBefore() family of constructors will create new packets (again with new data)
537 \e before a given existing packet <em>thereby destroying and overwriting any possibly
538 existing packets and data before the given packet</em>.
539 \li The createInsertBefore() family of constructors will create new packets \e before a
540 given packet \e inserting them into the packet chain after any existing packets before
543 Whereas create() will create a completely new packet with it's own chain and data storage,
544 createAfter(), createBefore() and createInsertBefore() extend a packet with additional
545 headers/interpreters. createAfter() will set the payload of the given packet to the new
546 packet whereas createBefore() and createInsertBefore() will create a new packet with the
547 existing packet as it's payload.
549 createAfter() differs from Packet::parseNextAs() in that the former creates a new packet \e
550 replacing any possibly existing data whereas the latter will interpret the already \e
551 existing data as given by the type argument.
553 \see \ref PacketTypeBase for a specification of the interface to be provided by the \a
554 PacketType policy class.
556 template <class PacketType>
561 ///////////////////////////////////////////////////////////////////////////
564 typedef PacketType type;
565 typedef typename PacketType::parser Parser;
567 ///////////////////////////////////////////////////////////////////////////
568 ///\name Structors and default members
571 // default copy constructor
572 // default copy assignment
573 // default destructor
574 // no conversion constructors
576 ConcretePacket(); ///< Create uninitialized packet handle
577 /**< An uninitialized handle is not valid(). It does not
578 allow any operation except assignment and checking for
581 static factory_t factory(); ///< Return factory for packets of specific type
582 /**< This \e static member is like Packet::factory() for a
583 specific packet of type \a PacketType */
585 // Create completely new packet
587 static ConcretePacket create(); ///< Create default initialized packet
588 /**< The packet will be initialized to it's default empty
590 static ConcretePacket create(senf::NoInit_t); ///< Create uninitialized empty packet
591 /**< This will create a completely empty and uninitialized
592 packet with <tt>size() == 0</tt>.
593 \param[in] senf::noinit This parameter must always have
594 the value \c senf::noinit. */
595 static ConcretePacket create(size_type size); ///< Create default initialized packet
596 /**< This member will create a default initialized packet
597 with the given size. If the size parameter is smaller
598 than the minimum allowed packet size an exception will
600 \param[in] size Size of the packet to create in bytes.
601 \throws TruncatedPacketException if \a size is smaller
602 than the smallest permissible size for this type of
604 static ConcretePacket create(size_type size, senf::NoInit_t);
605 ///< Create uninitialized packet
606 /**< Creates an uninitialized (all-zero) packet of the exact
608 \param[in] size Size of the packet to create in bytes
609 \param[in] senf::noinit This parameter must always have
610 the value \c senf::noinit. */
612 template <class ForwardReadableRange>
613 static ConcretePacket create(
614 ForwardReadableRange const & range,
615 typename boost::disable_if< boost::is_integral<ForwardReadableRange> >::type * = 0);
617 template <class ForwardReadableRange>
618 static ConcretePacket create(ForwardReadableRange const & range);
619 ///< Create packet from given data
620 /**< The packet will be created from a copy of the given
621 data. The data from the range will be copied directly
622 into the packet representation. The data will \e not be
623 validated in any way.
625 \param[in] range <a href="http://www.boost.org/doc/libs/release/libs/range/index.html">Boost.Range</a>
626 of data to construct packet from. */
629 // Create packet as new packet after a given packet
631 static ConcretePacket createAfter(Packet const & packet);
632 ///< Create default initialized packet after \a packet
633 /**< The packet will be initialized to it's default empty
634 state. It will be appended as next header/interpreter
635 after \a packet in that packets interpreter chain.
636 \param[in] packet Packet to append new packet to. */
637 static ConcretePacket createAfter(Packet const & packet, senf::NoInit_t);
638 ///< Create uninitialized empty packet after\a packet
639 /**< This will create a completely empty and uninitialized
640 packet with <tt>size() == 0</tt>. It will be appended
641 as next header/interpreter after \a packet in that
642 packets interpreter chain.
643 \param[in] packet Packet to append new packet to.
644 \param[in] senf::noinit This parameter must always have
645 the value \c senf::noinit. */
646 static ConcretePacket createAfter(Packet const & packet, size_type size);
647 ///< Create default initialized packet after \a packet
648 /**< This member will create a default initialized packet
649 with the given size. If the size parameter is smaller
650 than the minimum allowed packet size an exception will
651 be thrown. It will be appended as next
652 header/interpreter after \a packet in that packets
654 \param[in] packet Packet to append new packet to.
655 \param[in] size Size of the packet to create in bytes.
656 \throws TruncatedPacketException if \a size is smaller
657 than the smallest permissible size for this type of
659 static ConcretePacket createAfter(Packet const & packet, size_type size, senf::NoInit_t);
660 ///< Create uninitialized packet after \a packet
661 /**< Creates an uninitialized (all-zero) packet of the exact
662 given size. It will be appended as next
663 header/interpreter after \a packet in that packets
665 \param[in] packet Packet to append new packet to.
666 \param[in] size Size of the packet to create in bytes
667 \param[in] senf::noinit This parameter must always have
668 the value \c senf::noinit. */
670 template <class ForwardReadableRange>
671 static ConcretePacket createAfter(
672 Packet const & packet,
673 ForwardReadableRange const & range,
674 typename boost::disable_if< boost::is_integral<ForwardReadableRange> >::type * = 0);
676 template <class ForwardReadableRange>
677 static ConcretePacket createAfter(Packet const & packet,
678 ForwardReadableRange const & range);
679 ///< Create packet from given data after \a packet
680 /**< The packet will be created from a copy of the given
681 data. The data from the range will be copied directly
682 into the packet representation. The data will \e not be
683 validated in any way. It will be appended as next
684 header/interpreter after \a packet in that packets
686 \param[in] packet Packet to append new packet to.
687 \param[in] range <a href="http://www.boost.org/doc/libs/release/libs/range/index.html">Boost.Range</a>
688 of data to construct packet from. */
691 // Create packet as new packet (header) before a given packet
693 static ConcretePacket createBefore(Packet const & packet);
694 ///< Create default initialized packet before \a packet
695 /**< The packet will be initialized to it's default empty
696 state. It will be prepended as previous
697 header/interpreter before \a packet in that packets
699 \warning This constructor will destroy any existing
700 headers before \a packet and replace them with the
702 \param[in] packet Packet to prepend new packet to. */
703 static ConcretePacket createBefore(Packet const & packet, senf::NoInit_t);
704 ///< Create uninitialized empty packet before \a packet
705 /**< Creates a completely empty and uninitialized packet. It
706 will be prepended as previous header/interpreter before
707 \a packet in that packets interpreter chain.
708 \warning This constructor will destroy any existing
709 headers before \a packet and replace them with the
711 \param[in] packet Packet to prepend new packet to. */
713 static ConcretePacket createInsertBefore(Packet const & packet);
714 ///< Insert default initialized packet before \a packet
715 /**< The new packet header will be initialized to it' s
716 default empty state. It will be inserted into the
717 packet chain before \a packet.
718 \param[in] packet Packet before which to insert the new
720 static ConcretePacket createInsertBefore(Packet const & packet, senf::NoInit_t);
721 ///< Insert uninitialized empty packet before \a packet
722 /**< Inserts a completely empty and unitialized packet
723 before \a packet into the header/interpreter chain.
724 \param[in] packet Packet before which to insert the new
727 // Create a clone of the current packet
729 ConcretePacket clone() const;
732 ///////////////////////////////////////////////////////////////////////////
738 ParserProxy(Parser const & p) : p_ (p) {}
739 Parser * operator->() { return &p_; }
743 ParserProxy operator->() const; ///< Access packet fields
744 /**< This operator allows to access the parsed fields of the
745 packet using the notation <tt>packet->field()</tt>. The
746 fields of the packet are specified by the PacketType's
749 The members are not strictly restricted to simple field
750 access. The parser class may have any member which is
751 needed for full packet access (e.g. checksum validation
753 \see \ref packetparser for the parser interface. */
755 Parser parser() const; ///< Access packet field parser directly
756 /**< Access the parser of the packet. This is the same
757 object returned by the operator->() operator. The
758 operator however does not allow to access this object
759 itself, only it's members.
760 \see \ref packetparser for the parser interface */
765 typedef PacketInterpreter<PacketType> interpreter;
767 ConcretePacket(typename interpreter::ptr const & packet_);
769 interpreter * ptr() const;
772 friend class PacketInterpreter<PacketType>;
775 /** \brief Generic parser copying
777 This operator allows to copy the value of identical parsers. This operation does \e not
778 depend on the parsers detailed implementation, it will just replace the data bytes of the
779 target parser with those from the source packet.
781 template <class PacketType, class Parser>
782 Parser operator<<(Parser target, ConcretePacket<PacketType> const & packet);
788 ///////////////////////////////hh.e////////////////////////////////////////
790 #if !defined(HH_SENF_Packets_Packets__decls_) && !defined(HH_SENF_Packets_Packet_i_)
791 #define HH_SENF_Packets_Packet_i_
792 #include "Packet.cci"
794 #include "Packet.cti"
801 // c-file-style: "senf"
802 // indent-tabs-mode: nil
803 // ispell-local-dictionary: "american"
804 // compile-command: "scons -u test"
805 // comment-column: 40