serialization.h

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// Copyright (c) 2014-2020, The Monero Project
// 
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// permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
//    of conditions and the following disclaimer in the documentation and/or other
//    materials provided with the distribution.
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//    used to endorse or promote products derived from this software without specific
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers

#pragma once
#include <vector>
#include <deque>
#include <list>
#include <set>
#include <unordered_set>
#include <string>
#include <boost/type_traits/is_integral.hpp>
#include <boost/type_traits/integral_constant.hpp>
#include <boost/mpl/bool.hpp>

template <class T>
struct is_blob_type { typedef boost::false_type type; };

template <class T>
struct has_free_serializer { typedef boost::true_type type; };

template <class T>
struct is_basic_type { typedef boost::false_type type; };

template<typename F, typename S>
struct is_basic_type<std::pair<F,S>> { typedef boost::true_type type; };
template<>
struct is_basic_type<std::string> { typedef boost::true_type type; };

template <class Archive, class T>
struct serializer{
  static bool serialize(Archive &ar, T &v) {
    return serialize(ar, v, typename boost::is_integral<T>::type(), typename is_blob_type<T>::type(), typename is_basic_type<T>::type());
  }
  template<typename A>
  static bool serialize(Archive &ar, T &v, boost::false_type, boost::true_type, A a) {
    ar.serialize_blob(&v, sizeof(v));
    return true;
  }
  template<typename A>
  static bool serialize(Archive &ar, T &v, boost::true_type, boost::false_type, A a) {
    ar.serialize_int(v);
    return true;
  }
  static bool serialize(Archive &ar, T &v, boost::false_type, boost::false_type, boost::false_type) {
    //serialize_custom(ar, v, typename has_free_serializer<T>::type());
    return v.do_serialize(ar);
  }
  static bool serialize(Archive &ar, T &v, boost::false_type, boost::false_type, boost::true_type) {
    //serialize_custom(ar, v, typename has_free_serializer<T>::type());
    return do_serialize(ar, v);
  }
  static void serialize_custom(Archive &ar, T &v, boost::true_type) {
  }
};

template <class Archive, class T>
inline bool do_serialize(Archive &ar, T &v)
{
  return ::serializer<Archive, T>::serialize(ar, v);
}
template <class Archive>
inline bool do_serialize(Archive &ar, bool &v)
{
  ar.serialize_blob(&v, sizeof(v));
  return true;
}

// Never used in the code base
// #ifndef __GNUC__
// #ifndef constexpr
// #define constexpr
// #endif
// #endif

/* the following add a trait to a set and define the serialization DSL*/

#define BLOB_SERIALIZER(T)                      \
  template<>                                \
  struct is_blob_type<T> {                      \
    typedef boost::true_type type;                  \
  }

#define FREE_SERIALIZER(T)                      \
  template<>                                \
  struct has_free_serializer<T> {                   \
    typedef boost::true_type type;                  \
  }

#define VARIANT_TAG(Archive, Type, Tag)                 \
  template <bool W>                         \
  struct variant_serialization_traits<Archive<W>, Type> {       \
    static inline typename Archive<W>::variant_tag_type get_tag() { \
      return Tag;                           \
    }                                   \
  }

#define BEGIN_SERIALIZE()                       \
  template <bool W, template <bool> class Archive>          \
  bool do_serialize(Archive<W> &ar) {

#define BEGIN_SERIALIZE_OBJECT()                    \
  template <bool W, template <bool> class Archive>          \
  bool do_serialize(Archive<W> &ar) {                   \
    ar.begin_object();                          \
    bool r = do_serialize_object(ar);                   \
    ar.end_object();                            \
    return r;                               \
  }                                 \
  template <bool W, template <bool> class Archive>          \
  bool do_serialize_object(Archive<W> &ar){

#define PREPARE_CUSTOM_VECTOR_SERIALIZATION(size, vec)          \
  ::serialization::detail::prepare_custom_vector_serialization(size, vec, typename Archive<W>::is_saving())

#define PREPARE_CUSTOM_DEQUE_SERIALIZATION(size, vec)           \
  ::serialization::detail::prepare_custom_deque_serialization(size, vec, typename Archive<W>::is_saving())

#define END_SERIALIZE()             \
  return ar.stream().good();            \
  }

#define VALUE(f)                    \
  do {                          \
    ar.tag(#f);                     \
    bool r = ::do_serialize(ar, f);         \
    if (!r || !ar.stream().good()) return false;    \
  } while(0);

#define FIELD_N(t, f)                   \
  do {                          \
    ar.tag(t);                      \
    bool r = ::do_serialize(ar, f);         \
    if (!r || !ar.stream().good()) return false;    \
  } while(0);

#define FIELD(f)                    \
  do {                          \
    ar.tag(#f);                     \
    bool r = ::do_serialize(ar, f);         \
    if (!r || !ar.stream().good()) return false;    \
  } while(0);

#define FIELDS(f)                           \
  do {                                  \
    bool r = ::do_serialize(ar, f);                 \
    if (!r || !ar.stream().good()) return false;            \
  } while(0);

#define VARINT_FIELD(f)             \
  do {                      \
    ar.tag(#f);                 \
    ar.serialize_varint(f);         \
    if (!ar.stream().good()) return false;  \
  } while(0);

#define VARINT_FIELD_N(t, f)            \
  do {                      \
    ar.tag(t);                  \
    ar.serialize_varint(f);         \
    if (!ar.stream().good()) return false;  \
  } while(0);

#define MAGIC_FIELD(m)              \
  std::string magic = m;            \
  do {                      \
    ar.tag("magic");                \
    ar.serialize_blob((void*)magic.data(), magic.size()); \
    if (!ar.stream().good()) return false;  \
    if (magic != m) return false;       \
  } while(0);

#define VERSION_FIELD(v)            \
  uint32_t version = v;             \
  do {                      \
    ar.tag("version");              \
    ar.serialize_varint(version);       \
    if (!ar.stream().good()) return false;  \
  } while(0);


namespace serialization {
  namespace detail
  {
    template <typename T>
    void prepare_custom_vector_serialization(size_t size, std::vector<T>& vec, const boost::mpl::bool_<true>& /*is_saving*/)
    {
    }

    template <typename T>
    void prepare_custom_vector_serialization(size_t size, std::vector<T>& vec, const boost::mpl::bool_<false>& /*is_saving*/)
    {
      vec.resize(size);
    }

    template <typename T>
    void prepare_custom_deque_serialization(size_t size, std::deque<T>& vec, const boost::mpl::bool_<true>& /*is_saving*/)
    {
    }

    template <typename T>
    void prepare_custom_deque_serialization(size_t size, std::deque<T>& vec, const boost::mpl::bool_<false>& /*is_saving*/)
    {
      vec.resize(size);
    }

    template<class Stream>
    bool do_check_stream_state(Stream& s, boost::mpl::bool_<true>, bool noeof)
    {
      return s.good();
    }
    template<class Stream>
    bool do_check_stream_state(Stream& s, boost::mpl::bool_<false>, bool noeof)
    {
      bool result = false;
      if (s.good())
    {
      std::ios_base::iostate state = s.rdstate();
      result = noeof || EOF == s.peek();
      s.clear(state);
    }
      return result;
    }
  }

  template<class Archive>
  bool check_stream_state(Archive& ar, bool noeof = false)
  {
    return detail::do_check_stream_state(ar.stream(), typename Archive::is_saving(), noeof);
  }

  template <class Archive, class T>
  inline bool serialize(Archive &ar, T &v)
  {
    bool r = do_serialize(ar, v);
    return r && check_stream_state(ar, false);
  }

  template <class Archive, class T>
  inline bool serialize_noeof(Archive &ar, T &v)
  {
    bool r = do_serialize(ar, v);
    return r && check_stream_state(ar, true);
  }
}