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/*
* Library Internal/Global State
* (C) 1999-2008 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_LIB_STATE_H__
#define BOTAN_LIB_STATE_H__
#include <botan/allocate.h>
#include <botan/algo_factory.h>
#include <botan/rng.h>
#include <string>
#include <vector>
#include <map>
namespace Botan {
class Mutex;
/**
* Global state container aka the buritto at the center of it all
*/
class BOTAN_DLL Library_State
{
public:
Library_State();
~Library_State();
/**
* @param thread_safe should a mutex be used for serialization
*/
void initialize(bool thread_safe);
/**
* @return global Algorithm_Factory
*/
Algorithm_Factory& algorithm_factory() const;
/**
* @return global RandomNumberGenerator
*/
RandomNumberGenerator& global_rng();
/**
* @param name the name of the allocator
* @return allocator matching this name, or NULL
*/
Allocator* get_allocator(const std::string& name = "") const;
/**
* Add a new allocator to the list of available ones
* @param alloc the allocator to add
*/
void add_allocator(Allocator* alloc);
/**
* Set the default allocator
* @param name the name of the allocator to use as the default
*/
void set_default_allocator(const std::string& name);
/**
* Get a parameter value as std::string.
* @param section the section of the desired key
* @param key the desired keys name
* @result the value of the parameter
*/
std::string get(const std::string& section,
const std::string& key) const;
/**
* Check whether a certain parameter is set or not.
* @param section the section of the desired key
* @param key the desired keys name
* @result true if the parameters value is set,
* false otherwise
*/
bool is_set(const std::string& section,
const std::string& key) const;
/**
* Set a configuration parameter.
* @param section the section of the desired key
* @param key the desired keys name
* @param value the new value
* @param overwrite if set to true, the parameters value
* will be overwritten even if it is already set, otherwise
* no existing values will be overwritten.
*/
void set(const std::string& section,
const std::string& key,
const std::string& value,
bool overwrite = true);
/**
* Add a parameter value to the "alias" section.
* @param key the name of the parameter which shall have a new alias
* @param value the new alias
*/
void add_alias(const std::string& key,
const std::string& value);
/**
* Resolve an alias.
* @param alias the alias to resolve.
* @return what the alias stands for
*/
std::string deref_alias(const std::string& alias) const;
/**
* @return newly created Mutex (free with delete)
*/
Mutex* get_mutex() const;
private:
static RandomNumberGenerator* make_global_rng(Algorithm_Factory& af,
Mutex* mutex);
void load_default_config();
Library_State(const Library_State&) {}
Library_State& operator=(const Library_State&) { return (*this); }
class Mutex_Factory* mutex_factory;
Mutex* global_rng_lock;
RandomNumberGenerator* global_rng_ptr;
Mutex* config_lock;
std::map<std::string, std::string> config;
Mutex* allocator_lock;
std::string default_allocator_name;
std::map<std::string, Allocator*> alloc_factory;
mutable Allocator* cached_default_allocator;
std::vector<Allocator*> allocators;
Algorithm_Factory* m_algorithm_factory;
};
/**
* Access the global library state
* @return reference to the global library state
*/
BOTAN_DLL Library_State& global_state();
/**
* Set the global state object
* @param state the new global state to use
*/
BOTAN_DLL void set_global_state(Library_State* state);
/**
* Swap the current state for another
* @param new_state the new state object to use
* @return previous state (or NULL if none)
*/
BOTAN_DLL Library_State* swap_global_state(Library_State* new_state);
}
#endif
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