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135 lines
4.1 KiB
135 lines
4.1 KiB
#ifndef CRYPTOPP_OBJFACT_H
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#define CRYPTOPP_OBJFACT_H
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#include "cryptlib.h"
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#include <map>
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#include <vector>
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NAMESPACE_BEGIN(CryptoPP)
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//! _
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template <class AbstractClass>
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class ObjectFactory
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{
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public:
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virtual AbstractClass * CreateObject() const =0;
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};
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//! _
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template <class AbstractClass, class ConcreteClass>
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class DefaultObjectFactory : public ObjectFactory<AbstractClass>
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{
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public:
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AbstractClass * CreateObject() const
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{
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return new ConcreteClass;
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}
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};
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//! _
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template <class AbstractClass, int instance=0>
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class ObjectFactoryRegistry
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{
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public:
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class FactoryNotFound : public Exception
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{
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public:
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FactoryNotFound(const char *name) : Exception(OTHER_ERROR, std::string("ObjectFactoryRegistry: could not find factory for algorithm ") + name) {}
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};
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~ObjectFactoryRegistry()
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{
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for (CPP_TYPENAME Map::iterator i = m_map.begin(); i != m_map.end(); ++i)
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{
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delete (ObjectFactory<AbstractClass> *)i->second;
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i->second = NULL;
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}
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}
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void RegisterFactory(const std::string &name, ObjectFactory<AbstractClass> *factory)
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{
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m_map[name] = factory;
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}
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const ObjectFactory<AbstractClass> * GetFactory(const char *name) const
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{
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CPP_TYPENAME Map::const_iterator i = m_map.find(name);
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return i == m_map.end() ? NULL : (ObjectFactory<AbstractClass> *)i->second;
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}
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AbstractClass *CreateObject(const char *name) const
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{
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const ObjectFactory<AbstractClass> *factory = GetFactory(name);
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if (!factory)
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throw FactoryNotFound(name);
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return factory->CreateObject();
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}
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// Return a vector containing the factory names. This is easier than returning an iterator.
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// from Andrew Pitonyak
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std::vector<std::string> GetFactoryNames() const
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{
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std::vector<std::string> names;
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CPP_TYPENAME Map::const_iterator iter;
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for (iter = m_map.begin(); iter != m_map.end(); ++iter)
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names.push_back(iter->first);
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return names;
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}
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CRYPTOPP_NOINLINE static ObjectFactoryRegistry<AbstractClass, instance> & Registry(CRYPTOPP_NOINLINE_DOTDOTDOT);
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private:
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// use void * instead of ObjectFactory<AbstractClass> * to save code size
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typedef std::map<std::string, void *> Map;
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Map m_map;
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};
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template <class AbstractClass, int instance>
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ObjectFactoryRegistry<AbstractClass, instance> & ObjectFactoryRegistry<AbstractClass, instance>::Registry(CRYPTOPP_NOINLINE_DOTDOTDOT)
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{
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static ObjectFactoryRegistry<AbstractClass, instance> s_registry;
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return s_registry;
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}
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template <class AbstractClass, class ConcreteClass, int instance = 0>
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struct RegisterDefaultFactoryFor {
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RegisterDefaultFactoryFor(const char *name=NULL)
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{
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// BCB2006 workaround
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std::string n = name ? std::string(name) : std::string(ConcreteClass::StaticAlgorithmName());
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ObjectFactoryRegistry<AbstractClass, instance>::Registry().
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RegisterFactory(n, new DefaultObjectFactory<AbstractClass, ConcreteClass>);
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}};
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template <class SchemeClass>
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void RegisterAsymmetricCipherDefaultFactories(const char *name=NULL, SchemeClass *dummy=NULL)
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{
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RegisterDefaultFactoryFor<PK_Encryptor, CPP_TYPENAME SchemeClass::Encryptor>((const char *)name);
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RegisterDefaultFactoryFor<PK_Decryptor, CPP_TYPENAME SchemeClass::Decryptor>((const char *)name);
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}
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template <class SchemeClass>
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void RegisterSignatureSchemeDefaultFactories(const char *name=NULL, SchemeClass *dummy=NULL)
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{
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RegisterDefaultFactoryFor<PK_Signer, CPP_TYPENAME SchemeClass::Signer>((const char *)name);
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RegisterDefaultFactoryFor<PK_Verifier, CPP_TYPENAME SchemeClass::Verifier>((const char *)name);
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}
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template <class SchemeClass>
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void RegisterSymmetricCipherDefaultFactories(const char *name=NULL, SchemeClass *dummy=NULL)
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{
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RegisterDefaultFactoryFor<SymmetricCipher, CPP_TYPENAME SchemeClass::Encryption, ENCRYPTION>((const char *)name);
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RegisterDefaultFactoryFor<SymmetricCipher, CPP_TYPENAME SchemeClass::Decryption, DECRYPTION>((const char *)name);
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}
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template <class SchemeClass>
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void RegisterAuthenticatedSymmetricCipherDefaultFactories(const char *name=NULL, SchemeClass *dummy=NULL)
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{
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RegisterDefaultFactoryFor<AuthenticatedSymmetricCipher, CPP_TYPENAME SchemeClass::Encryption, ENCRYPTION>((const char *)name);
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RegisterDefaultFactoryFor<AuthenticatedSymmetricCipher, CPP_TYPENAME SchemeClass::Decryption, DECRYPTION>((const char *)name);
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}
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NAMESPACE_END
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#endif
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