mirror of
https://github.com/vcmi/vcmi.git
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498 lines
12 KiB
C++
498 lines
12 KiB
C++
/*
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* BinarySerializer.h, part of VCMI engine
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*
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* Authors: listed in file AUTHORS in main folder
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*
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* License: GNU General Public License v2.0 or later
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* Full text of license available in license.txt file, in main folder
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*
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*/
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#pragma once
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#include "CSerializer.h"
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#include "CTypeList.h"
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#include "ESerializationVersion.h"
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#include "Serializeable.h"
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#include "../mapObjects/CArmedInstance.h"
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VCMI_LIB_NAMESPACE_BEGIN
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class DLL_LINKAGE CSaverBase
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{
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protected:
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IBinaryWriter * writer;
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public:
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CSaverBase(IBinaryWriter * w): writer(w){};
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void write(const void * data, unsigned size)
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{
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writer->write(reinterpret_cast<const std::byte*>(data), size);
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};
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};
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/// Main class for serialization of classes into binary form
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/// Behaviour for various classes is following:
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/// Primitives: copy memory into underlying stream (defined in CSaverBase)
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/// Containers: custom overloaded method that decouples class into primitives
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/// VCMI Classes: recursively serialize them via ClassName::serialize( BinarySerializer &, int version) call
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class BinarySerializer : public CSaverBase
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{
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template<typename Handler>
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struct VariantVisitorSaver
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{
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Handler &h;
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VariantVisitorSaver(Handler &H):h(H)
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{
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}
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template <typename T>
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void operator()(const T &t)
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{
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h & t;
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}
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};
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template<typename Ser,typename T>
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struct SaveIfStackInstance
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{
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static bool invoke(Ser &s, const T &data)
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{
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return false;
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}
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};
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template<typename Ser>
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struct SaveIfStackInstance<Ser, CStackInstance *>
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{
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static bool invoke(Ser &s, const CStackInstance* const &data)
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{
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assert(data->armyObj);
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SlotID slot;
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if(data->getNodeType() == CBonusSystemNode::COMMANDER)
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slot = SlotID::COMMANDER_SLOT_PLACEHOLDER;
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else
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slot = data->armyObj->findStack(data);
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assert(slot != SlotID());
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s & data->armyObj & slot;
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return true;
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}
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};
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template <typename T> class CPointerSaver;
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class CBasicPointerSaver
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{
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public:
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virtual void savePtr(CSaverBase &ar, const Serializeable *data) const =0;
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virtual ~CBasicPointerSaver() = default;
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template<typename T> static CBasicPointerSaver *getApplier(const T * t=nullptr)
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{
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return new CPointerSaver<T>();
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}
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};
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template <typename T>
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class CPointerSaver : public CBasicPointerSaver
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{
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public:
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void savePtr(CSaverBase &ar, const Serializeable *data) const override
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{
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auto & s = static_cast<BinarySerializer &>(ar);
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const T *ptr = dynamic_cast<const T*>(data);
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//T is most derived known type, it's time to call actual serialize
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const_cast<T*>(ptr)->serialize(s);
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}
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};
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CApplier<CBasicPointerSaver> applier;
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public:
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using Version = ESerializationVersion;
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std::map<std::string, uint32_t> savedStrings;
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std::map<const Serializeable*, uint32_t> savedPointers;
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Version version = Version::CURRENT;
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bool smartPointerSerialization;
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bool saving;
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bool hasFeature(Version what) const
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{
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return version >= what;
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};
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DLL_LINKAGE BinarySerializer(IBinaryWriter * w);
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template<typename Base, typename Derived>
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void registerType(const Base * b = nullptr, const Derived * d = nullptr)
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{
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applier.registerType(b, d);
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}
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template<class T>
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BinarySerializer & operator&(const T & t)
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{
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this->save(t);
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return * this;
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}
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void saveEncodedInteger(int64_t value)
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{
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uint64_t valueUnsigned = std::abs(value);
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while (valueUnsigned > 0x3f)
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{
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uint8_t byteValue = (valueUnsigned & 0x7f) | 0x80;
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valueUnsigned = valueUnsigned >> 7;
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save(byteValue);
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}
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uint8_t lastByteValue = valueUnsigned & 0x3f;
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if (value < 0)
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lastByteValue |= 0x40;
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save(lastByteValue);
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}
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template < typename T, typename std::enable_if_t < std::is_same_v<T, bool>, int > = 0 >
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void save(const T &data)
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{
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uint8_t writ = static_cast<uint8_t>(data);
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save(writ);
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}
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template < class T, typename std::enable_if_t < std::is_floating_point_v<T>, int > = 0 >
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void save(const T &data)
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{
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// save primitive - simply dump binary data to output
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this->write(static_cast<const void *>(&data), sizeof(data));
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}
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template < class T, typename std::enable_if_t < std::is_integral_v<T> && !std::is_same_v<T, bool>, int > = 0 >
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void save(const T &data)
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{
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if constexpr (sizeof(T) == 1)
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{
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// save primitive - simply dump binary data to output
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this->write(static_cast<const void *>(&data), sizeof(data));
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}
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else
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{
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if (hasFeature(Version::COMPACT_INTEGER_SERIALIZATION))
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saveEncodedInteger(data);
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else
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this->write(static_cast<const void *>(&data), sizeof(data));
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}
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}
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void save(const Version &data)
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{
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this->write(static_cast<const void *>(&data), sizeof(data));
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}
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template < typename T, typename std::enable_if_t < std::is_enum_v<T>, int > = 0 >
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void save(const T &data)
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{
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int32_t writ = static_cast<int32_t>(data);
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*this & writ;
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}
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template < typename T, typename std::enable_if_t < std::is_array_v<T>, int > = 0 >
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void save(const T &data)
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{
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uint32_t size = std::size(data);
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for(uint32_t i=0; i < size; i++)
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*this & data[i];
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}
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template < typename T, typename std::enable_if_t < std::is_pointer_v<T>, int > = 0 >
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void save(const T &data)
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{
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//write if pointer is not nullptr
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bool isNull = (data == nullptr);
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save(isNull);
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//if pointer is nullptr then we don't need anything more...
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if(data == nullptr)
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return;
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savePointerImpl(data);
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}
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template < typename T, typename std::enable_if_t < std::is_base_of_v<Entity, std::remove_pointer_t<T>>, int > = 0 >
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void savePointerImpl(const T &data)
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{
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auto index = data->getId();
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save(index);
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}
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template < typename T, typename std::enable_if_t < !std::is_base_of_v<Entity, std::remove_pointer_t<T>>, int > = 0 >
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void savePointerImpl(const T &data)
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{
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typedef typename std::remove_const_t<typename std::remove_pointer_t<T>> TObjectType;
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if(writer->smartVectorMembersSerialization)
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{
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typedef typename VectorizedTypeFor<TObjectType>::type VType;
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typedef typename VectorizedIDType<TObjectType>::type IDType;
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if(const auto *info = writer->getVectorizedTypeInfo<VType, IDType>())
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{
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IDType id = writer->getIdFromVectorItem<VType>(*info, data);
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save(id);
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if(id != IDType(-1)) //vector id is enough
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return;
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}
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}
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if(writer->sendStackInstanceByIds)
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{
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const bool gotSaved = SaveIfStackInstance<BinarySerializer,T>::invoke(*this, data);
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if(gotSaved)
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return;
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}
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if(smartPointerSerialization)
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{
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// We might have an object that has multiple inheritance and store it via the non-first base pointer.
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// Therefore, all pointers need to be normalized to the actual object address.
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const auto * actualPointer = static_cast<const Serializeable*>(data);
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auto i = savedPointers.find(actualPointer);
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if(i != savedPointers.end())
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{
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//this pointer has been already serialized - write only it's id
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save(i->second);
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return;
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}
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//give id to this pointer
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uint32_t pid = savedPointers.size();
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savedPointers[actualPointer] = pid;
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save(pid);
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}
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//write type identifier
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uint16_t tid = CTypeList::getInstance().getTypeID(data);
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save(tid);
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if(!tid)
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save(*data); //if type is unregistered simply write all data in a standard way
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else
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applier.getApplier(tid)->savePtr(*this, static_cast<const Serializeable*>(data)); //call serializer specific for our real type
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}
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template < typename T, typename std::enable_if_t < is_serializeable<BinarySerializer, T>::value, int > = 0 >
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void save(const T &data)
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{
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const_cast<T&>(data).serialize(*this);
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}
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void save(const std::monostate & data)
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{
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// no-op
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}
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template <typename T>
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void save(const std::shared_ptr<T> &data)
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{
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T *internalPtr = data.get();
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save(internalPtr);
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}
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template <typename T>
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void save(const std::shared_ptr<const T> &data)
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{
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const T *internalPtr = data.get();
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save(internalPtr);
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}
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template <typename T>
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void save(const std::unique_ptr<T> &data)
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{
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T *internalPtr = data.get();
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save(internalPtr);
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}
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template <typename T, typename std::enable_if_t < !std::is_same_v<T, bool >, int > = 0>
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void save(const std::vector<T> &data)
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{
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uint32_t length = data.size();
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*this & length;
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for(uint32_t i=0;i<length;i++)
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save(data[i]);
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}
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template <typename T, typename std::enable_if_t < !std::is_same_v<T, bool >, int > = 0>
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void save(const std::deque<T> & data)
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{
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uint32_t length = data.size();
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*this & length;
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for(uint32_t i = 0; i < length; i++)
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save(data[i]);
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}
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template <typename T, size_t N>
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void save(const std::array<T, N> &data)
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{
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for(uint32_t i=0; i < N; i++)
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save(data[i]);
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}
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template <typename T>
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void save(const std::set<T> &data)
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{
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auto & d = const_cast<std::set<T> &>(data);
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uint32_t length = d.size();
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save(length);
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for(auto i = d.begin(); i != d.end(); i++)
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save(*i);
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}
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template <typename T, typename U>
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void save(const std::unordered_set<T, U> &data)
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{
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auto & d = const_cast<std::unordered_set<T, U> &>(data);
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uint32_t length = d.size();
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*this & length;
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for(auto i = d.begin(); i != d.end(); i++)
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save(*i);
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}
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template <typename T>
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void save(const std::list<T> &data)
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{
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auto & d = const_cast<std::list<T> &>(data);
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uint32_t length = d.size();
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*this & length;
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for(auto i = d.begin(); i != d.end(); i++)
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save(*i);
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}
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void save(const std::string &data)
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{
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if (hasFeature(Version::COMPACT_STRING_SERIALIZATION))
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{
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if (data.empty())
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{
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save(static_cast<uint32_t>(0));
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return;
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}
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auto it = savedStrings.find(data);
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if (it == savedStrings.end())
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{
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save(static_cast<uint32_t>(data.length()));
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this->write(static_cast<const void *>(data.data()), data.size());
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// -1, -2...
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int32_t newStringID = -1 - savedStrings.size();
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savedStrings[data] = newStringID;
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}
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else
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{
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int32_t index = it->second;
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save(index);
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}
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}
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else
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{
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save(static_cast<uint32_t>(data.length()));
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this->write(static_cast<const void *>(data.data()), data.size());
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}
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}
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template <typename T1, typename T2>
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void save(const std::pair<T1,T2> &data)
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{
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save(data.first);
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save(data.second);
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}
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template <typename T1, typename T2>
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void save(const std::unordered_map<T1,T2> &data)
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{
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*this & static_cast<uint32_t>(data.size());
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for(auto i = data.begin(); i != data.end(); i++)
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{
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save(i->first);
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save(i->second);
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}
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}
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template <typename T1, typename T2>
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void save(const std::map<T1,T2> &data)
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{
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*this & static_cast<uint32_t>(data.size());
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for(auto i = data.begin(); i != data.end(); i++)
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{
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save(i->first);
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save(i->second);
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}
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}
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template <typename T1, typename T2>
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void save(const std::multimap<T1, T2> &data)
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{
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*this & static_cast<uint32_t>(data.size());
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for(auto i = data.begin(); i != data.end(); i++)
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{
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save(i->first);
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save(i->second);
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}
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}
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template<typename T0, typename... TN>
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void save(const std::variant<T0, TN...> & data)
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{
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int32_t which = data.index();
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save(which);
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VariantVisitorSaver<BinarySerializer> visitor(*this);
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std::visit(visitor, data);
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}
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template<typename T>
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void save(const std::optional<T> & data)
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{
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if(data)
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{
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save(static_cast<uint8_t>(1));
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save(*data);
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}
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else
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{
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save(static_cast<uint32_t>(0));
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}
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}
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template <typename T>
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void save(const boost::multi_array<T, 3> &data)
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{
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uint32_t length = data.num_elements();
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*this & length;
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auto shape = data.shape();
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uint32_t x = shape[0];
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uint32_t y = shape[1];
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uint32_t z = shape[2];
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*this & x & y & z;
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for(uint32_t i = 0; i < length; i++)
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save(data.data()[i]);
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}
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template <std::size_t T>
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void save(const std::bitset<T> &data)
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{
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static_assert(T <= 64);
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if constexpr (T <= 16)
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{
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auto writ = static_cast<uint16_t>(data.to_ulong());
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save(writ);
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}
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else if constexpr (T <= 32)
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{
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auto writ = static_cast<uint32_t>(data.to_ulong());
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save(writ);
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}
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else if constexpr (T <= 64)
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{
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auto writ = static_cast<uint64_t>(data.to_ulong());
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save(writ);
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}
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}
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};
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VCMI_LIB_NAMESPACE_END
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