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/*
* (C) 2014,2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_ALGO_REGISTRY_H__
#define BOTAN_ALGO_REGISTRY_H__
#include <botan/lookup.h>
#include <functional>
#include <stdexcept>
#include <mutex>
#include <vector>
#include <map>
#include <string>
#include <unordered_map>
namespace Botan {
template<typename T>
class Algo_Registry
{
public:
typedef typename T::Spec Spec;
typedef std::function<T* (const Spec&)> maker_fn;
static Algo_Registry<T>& global_registry()
{
static Algo_Registry<T> g_registry;
return g_registry;
}
void add(const std::string& name, const std::string& provider, maker_fn fn, byte pref)
{
std::unique_lock<std::mutex> lock(m_mutex);
m_algo_info[name].add_provider(provider, fn, pref);
}
std::vector<std::string> providers_of(const Spec& spec)
{
std::unique_lock<std::mutex> lock(m_mutex);
auto i = m_algo_info.find(spec.algo_name());
if(i != m_algo_info.end())
return i->second.providers();
return std::vector<std::string>();
}
T* make(const Spec& spec, const std::string& provider = "")
{
maker_fn maker = find_maker(spec, provider);
try
{
return maker(spec);
}
catch(std::exception& e)
{
throw std::runtime_error("Creating '" + spec.as_string() + "' failed: " + e.what());
}
}
class Add
{
public:
Add(const std::string& basename, maker_fn fn, const std::string& provider, byte pref)
{
Algo_Registry<T>::global_registry().add(basename, provider, fn, pref);
}
Add(bool cond, const std::string& basename, maker_fn fn, const std::string& provider, byte pref)
{
if(cond)
Algo_Registry<T>::global_registry().add(basename, provider, fn, pref);
}
};
private:
Algo_Registry() {}
maker_fn find_maker(const Spec& spec, const std::string& provider)
{
std::unique_lock<std::mutex> lock(m_mutex);
return m_algo_info[spec.algo_name()].get_maker(provider);
}
struct Algo_Info
{
public:
void add_provider(const std::string& provider, maker_fn fn, byte pref = 128)
{
if(m_maker_fns.count(provider) > 0)
throw std::runtime_error("Duplicated registration of '" + provider + "'");
m_maker_fns[provider] = std::make_pair(pref, fn);
}
std::vector<std::string> providers() const
{
std::vector<std::string> v;
for(auto&& k : m_maker_fns)
v.push_back(k.first);
return v;
}
void set_pref(const std::string& provider, byte val)
{
m_maker_fns[provider].first = val;
}
maker_fn get_maker(const std::string& req_provider)
{
maker_fn null_result = [](const Spec&) { return nullptr; };
if(req_provider != "")
{
// find one explicit provider requested by user or fail
auto i = m_maker_fns.find(req_provider);
if(i != m_maker_fns.end())
return i->second.second;
return null_result;
}
size_t pref = 255;
maker_fn result = null_result;
for(auto&& i : m_maker_fns)
{
if(i.second.first < pref)
{
pref = i.second.first;
result = i.second.second;
}
}
return result;
}
private:
std::unordered_map<std::string, std::pair<byte, maker_fn>> m_maker_fns; // provider -> (pref, creator fn)
};
std::mutex m_mutex;
std::unordered_map<std::string, Algo_Info> m_algo_info;
};
template<typename T> T*
make_a(const typename T::Spec& spec, const std::string provider = "")
{
return Algo_Registry<T>::global_registry().make(spec, provider);
}
template<typename T> std::vector<std::string> providers_of(const typename T::Spec& spec)
{
return Algo_Registry<T>::global_registry().providers_of(spec);
}
template<typename T> T*
make_new_T(const typename Algo_Registry<T>::Spec&) { return new T; }
template<typename T, size_t DEF_VAL> T*
make_new_T_1len(const typename Algo_Registry<T>::Spec& spec)
{
return new T(spec.arg_as_integer(0, DEF_VAL));
}
template<typename T, size_t DEF1, size_t DEF2> T*
make_new_T_2len(const typename Algo_Registry<T>::Spec& spec)
{
return new T(spec.arg_as_integer(0, DEF1), spec.arg_as_integer(1, DEF2));
}
template<typename T> T*
make_new_T_1str(const typename Algo_Registry<T>::Spec& spec, const std::string& def)
{
return new T(spec.arg(0, def));
}
template<typename T> T*
make_new_T_1str_req(const typename Algo_Registry<T>::Spec& spec)
{
return new T(spec.arg(0));
}
template<typename T, typename X> T*
make_new_T_1X(const typename Algo_Registry<T>::Spec& spec)
{
std::unique_ptr<X> x(Algo_Registry<X>::global_registry().make(spec.arg(0)));
if(!x)
throw std::runtime_error(spec.arg(0));
return new T(x.release());
}
#define BOTAN_REGISTER_TYPE(T, type, name, maker, provider, pref) \
namespace { Algo_Registry<T>::Add g_ ## type ## _reg(name, maker, provider, pref); }
#define BOTAN_REGISTER_TYPE_COND(cond, T, type, name, maker, provider, pref) \
namespace { Algo_Registry<T>::Add g_ ## type ## _reg(cond, name, maker, provider, pref); }
#define BOTAN_REGISTER_NAMED_T(T, name, type, maker) \
BOTAN_REGISTER_TYPE(T, type, name, maker, "builtin", 128)
#define BOTAN_REGISTER_T(T, type, maker) \
BOTAN_REGISTER_TYPE(T, type, #type, maker, "builtin", 128)
#define BOTAN_REGISTER_T_NOARGS(T, type) \
BOTAN_REGISTER_TYPE(T, type, #type, make_new_T<type>, "builtin", 128)
#define BOTAN_REGISTER_T_1LEN(T, type, def) \
BOTAN_REGISTER_TYPE(T, type, #type, (make_new_T_1len<type,def>), "builtin", 128)
#define BOTAN_REGISTER_NAMED_T_NOARGS(T, type, name, provider) \
BOTAN_REGISTER_TYPE(T, type, name, make_new_T<type>, provider, 128)
#define BOTAN_COND_REGISTER_NAMED_T_NOARGS(cond, T, type, name, provider, pref) \
BOTAN_REGISTER_TYPE_COND(cond, T, type, name, make_new_T<type>, provider, pref)
#define BOTAN_REGISTER_NAMED_T_2LEN(T, type, name, provider, len1, len2) \
BOTAN_REGISTER_TYPE(T, type, name, (make_new_T_2len<type,len1,len2>), provider, 128)
// TODO move elsewhere:
#define BOTAN_REGISTER_TRANSFORM(name, maker) BOTAN_REGISTER_T(Transform, name, maker)
#define BOTAN_REGISTER_TRANSFORM_NOARGS(name) BOTAN_REGISTER_T_NOARGS(Transform, name)
}
#endif
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