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376 lines
11 KiB
C++
376 lines
11 KiB
C++
// Copyright (c) 2014-2019, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
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/*! \file serialization.h
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* \brief Simple DSL AAPI based on
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*
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* \detailed is_blob_type and has_free_serializer are
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* both descriptors for dispatching on to the serialize function.
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*
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* The API itself defines a domain specific language via dirty macro
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* hacks. Greenspun's tenth rule is very much in action throughout
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* this entire code base.
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*/
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#pragma once
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#include <vector>
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#include <deque>
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#include <list>
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#include <set>
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#include <unordered_set>
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#include <string>
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#include <boost/type_traits/is_integral.hpp>
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#include <boost/type_traits/integral_constant.hpp>
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/*! \struct is_blob_type
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*
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* \brief a descriptor for dispatching serialize
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*/
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template <class T>
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struct is_blob_type { typedef boost::false_type type; };
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/*! \struct has_free_serializer
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*
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* \brief a descriptor for dispatching serialize
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*/
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template <class T>
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struct has_free_serializer { typedef boost::true_type type; };
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/*! \struct is_basic_type
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*
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* \brief a descriptor for dispatching serialize
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*/
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template <class T>
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struct is_basic_type { typedef boost::false_type type; };
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template<typename F, typename S>
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struct is_basic_type<std::pair<F,S>> { typedef boost::true_type type; };
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template<>
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struct is_basic_type<std::string> { typedef boost::true_type type; };
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/*! \struct serializer
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*
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* \brief ... wouldn't a class be better?
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*
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* \detailed The logic behind serializing data. Places the archive
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* data into the supplied parameter. This dispatches based on the
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* supplied \a T template parameter's traits of is_blob_type or it is
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* an integral (as defined by the is_integral trait). Depends on the
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* \a Archive parameter to have overloaded the serialize_blob(T v,
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* size_t size) and serialize_int(T v) base on which trait it
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* applied. When the class has neither types, it falls to the
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* overloaded method do_serialize(Archive ar) in T to do the work.
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*/
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template <class Archive, class T>
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struct serializer{
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static bool serialize(Archive &ar, T &v) {
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return serialize(ar, v, typename boost::is_integral<T>::type(), typename is_blob_type<T>::type(), typename is_basic_type<T>::type());
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}
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template<typename A>
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static bool serialize(Archive &ar, T &v, boost::false_type, boost::true_type, A a) {
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ar.serialize_blob(&v, sizeof(v));
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return true;
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}
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template<typename A>
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static bool serialize(Archive &ar, T &v, boost::true_type, boost::false_type, A a) {
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ar.serialize_int(v);
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return true;
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}
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static bool serialize(Archive &ar, T &v, boost::false_type, boost::false_type, boost::false_type) {
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//serialize_custom(ar, v, typename has_free_serializer<T>::type());
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return v.do_serialize(ar);
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}
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static bool serialize(Archive &ar, T &v, boost::false_type, boost::false_type, boost::true_type) {
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//serialize_custom(ar, v, typename has_free_serializer<T>::type());
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return do_serialize(ar, v);
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}
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static void serialize_custom(Archive &ar, T &v, boost::true_type) {
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}
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};
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/*! \fn do_serialize(Archive &ar, T &v)
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*
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* \brief just calls the serialize function defined for ar and v...
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*/
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template <class Archive, class T>
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inline bool do_serialize(Archive &ar, T &v)
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{
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return ::serializer<Archive, T>::serialize(ar, v);
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}
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template <class Archive>
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inline bool do_serialize(Archive &ar, bool &v)
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{
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ar.serialize_blob(&v, sizeof(v));
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return true;
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}
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// Never used in the code base
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// #ifndef __GNUC__
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// #ifndef constexpr
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// #define constexpr
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// #endif
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// #endif
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/* the following add a trait to a set and define the serialization DSL*/
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/*! \macro BLOB_SERIALIZER
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*
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* \brief makes the type have a blob serializer trait defined
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*/
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#define BLOB_SERIALIZER(T) \
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template<> \
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struct is_blob_type<T> { \
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typedef boost::true_type type; \
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}
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/*! \macro FREE_SERIALIZER
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*
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* \brief adds the has_free_serializer to the type
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*/
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#define FREE_SERIALIZER(T) \
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template<> \
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struct has_free_serializer<T> { \
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typedef boost::true_type type; \
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}
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/*! \macro VARIANT_TAG
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*
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* \brief Adds the tag \tag to the \a Archive of \a Type
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*/
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#define VARIANT_TAG(Archive, Type, Tag) \
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template <bool W> \
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struct variant_serialization_traits<Archive<W>, Type> { \
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static inline typename Archive<W>::variant_tag_type get_tag() { \
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return Tag; \
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} \
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}
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/*! \macro BEGIN_SERIALIZE
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*
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* \brief Begins the environment of the DSL
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* \detailed for describing how to
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* serialize an of an archive type
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*/
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#define BEGIN_SERIALIZE() \
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template <bool W, template <bool> class Archive> \
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bool do_serialize(Archive<W> &ar) {
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/*! \macro BEGIN_SERIALIZE_OBJECT
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*
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* \brief begins the environment of the DSL
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* \detailed for described the serialization of an object
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*/
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#define BEGIN_SERIALIZE_OBJECT() \
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template <bool W, template <bool> class Archive> \
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bool do_serialize(Archive<W> &ar) { \
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ar.begin_object(); \
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bool r = do_serialize_object(ar); \
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ar.end_object(); \
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return r; \
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} \
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template <bool W, template <bool> class Archive> \
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bool do_serialize_object(Archive<W> &ar){
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/*! \macro PREPARE_CUSTOM_VECTOR_SERIALIZATION
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*/
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#define PREPARE_CUSTOM_VECTOR_SERIALIZATION(size, vec) \
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::serialization::detail::prepare_custom_vector_serialization(size, vec, typename Archive<W>::is_saving())
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/*! \macro PREPARE_CUSTOM_DEQUE_SERIALIZATION
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*/
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#define PREPARE_CUSTOM_DEQUE_SERIALIZATION(size, vec) \
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::serialization::detail::prepare_custom_deque_serialization(size, vec, typename Archive<W>::is_saving())
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/*! \macro END_SERIALIZE
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* \brief self-explanatory
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*/
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#define END_SERIALIZE() \
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return ar.stream().good(); \
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}
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/*! \macro VALUE(f)
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* \brief the same as FIELD(f)
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*/
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#define VALUE(f) \
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do { \
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ar.tag(#f); \
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bool r = ::do_serialize(ar, f); \
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if (!r || !ar.stream().good()) return false; \
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} while(0);
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/*! \macro FIELD_N(t,f)
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*
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* \brief serializes a field \a f tagged \a t
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*/
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#define FIELD_N(t, f) \
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do { \
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ar.tag(t); \
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bool r = ::do_serialize(ar, f); \
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if (!r || !ar.stream().good()) return false; \
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} while(0);
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/*! \macro FIELD(f)
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*
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* \brief tags the field with the variable name and then serializes it
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*/
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#define FIELD(f) \
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do { \
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ar.tag(#f); \
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bool r = ::do_serialize(ar, f); \
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if (!r || !ar.stream().good()) return false; \
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} while(0);
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/*! \macro FIELDS(f)
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*
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* \brief does not add a tag to the serialized value
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*/
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#define FIELDS(f) \
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do { \
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bool r = ::do_serialize(ar, f); \
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if (!r || !ar.stream().good()) return false; \
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} while(0);
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/*! \macro VARINT_FIELD(f)
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* \brief tags and serializes the varint \a f
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*/
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#define VARINT_FIELD(f) \
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do { \
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ar.tag(#f); \
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ar.serialize_varint(f); \
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if (!ar.stream().good()) return false; \
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} while(0);
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/*! \macro VARINT_FIELD_N(t, f)
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*
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* \brief tags (as \a t) and serializes the varint \a f
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*/
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#define VARINT_FIELD_N(t, f) \
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do { \
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ar.tag(t); \
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ar.serialize_varint(f); \
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if (!ar.stream().good()) return false; \
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} while(0);
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namespace serialization {
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/*! \namespace detail
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*
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* \brief declaration and default definition for the functions used the API
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*
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*/
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namespace detail
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{
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/*! \fn prepare_custom_vector_serialization
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*
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* prepares the vector /vec for serialization
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*/
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template <typename T>
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void prepare_custom_vector_serialization(size_t size, std::vector<T>& vec, const boost::mpl::bool_<true>& /*is_saving*/)
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{
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}
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template <typename T>
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void prepare_custom_vector_serialization(size_t size, std::vector<T>& vec, const boost::mpl::bool_<false>& /*is_saving*/)
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{
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vec.resize(size);
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}
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template <typename T>
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void prepare_custom_deque_serialization(size_t size, std::deque<T>& vec, const boost::mpl::bool_<true>& /*is_saving*/)
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{
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}
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template <typename T>
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void prepare_custom_deque_serialization(size_t size, std::deque<T>& vec, const boost::mpl::bool_<false>& /*is_saving*/)
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{
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vec.resize(size);
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}
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/*! \fn do_check_stream_state
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*
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* \brief self explanatory
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*/
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template<class Stream>
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bool do_check_stream_state(Stream& s, boost::mpl::bool_<true>, bool noeof)
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{
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return s.good();
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}
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/*! \fn do_check_stream_state
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*
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* \brief self explanatory
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*
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* \detailed Also checks to make sure that the stream is not at EOF
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*/
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template<class Stream>
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bool do_check_stream_state(Stream& s, boost::mpl::bool_<false>, bool noeof)
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{
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bool result = false;
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if (s.good())
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{
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std::ios_base::iostate state = s.rdstate();
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result = noeof || EOF == s.peek();
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s.clear(state);
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}
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return result;
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}
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}
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/*! \fn check_stream_state
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*
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* \brief calls detail::do_check_stream_state for ar
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*/
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template<class Archive>
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bool check_stream_state(Archive& ar, bool noeof = false)
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{
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return detail::do_check_stream_state(ar.stream(), typename Archive::is_saving(), noeof);
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}
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/*! \fn serialize
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*
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* \brief serializes \a v into \a ar
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*/
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template <class Archive, class T>
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inline bool serialize(Archive &ar, T &v)
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{
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bool r = do_serialize(ar, v);
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return r && check_stream_state(ar, false);
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}
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/*! \fn serialize
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*
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* \brief serializes \a v into \a ar
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*/
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template <class Archive, class T>
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inline bool serialize_noeof(Archive &ar, T &v)
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{
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bool r = do_serialize(ar, v);
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return r && check_stream_state(ar, true);
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}
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}
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