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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2013 Nils Maier
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
/* copyright --> */
#ifndef D_MESSAGE_DIGEST_IMPL_H
#define D_MESSAGE_DIGEST_IMPL_H
#include "common.h"
#include <string>
#include <memory>
#include <functional>
#include <map>
#include <tuple>
#include "a2functional.h"
namespace aria2 {
class MessageDigestImpl {
public:
typedef std::function<std::unique_ptr<MessageDigestImpl>()> factory_t;
typedef std::tuple<factory_t, size_t> hash_info_t;
typedef std::map<std::string, hash_info_t> hashes_t;
template <typename T> inline static hash_info_t make_hi()
{
return std::make_tuple([]() { return make_unique<T>(); }, T::length());
}
private:
static hashes_t hashes;
MessageDigestImpl(const MessageDigestImpl&) = delete;
MessageDigestImpl& operator=(const MessageDigestImpl&) = delete;
public:
virtual ~MessageDigestImpl() {}
static std::unique_ptr<MessageDigestImpl> sha1();
inline static std::unique_ptr<MessageDigestImpl>
create(const std::string& hashType)
{
auto i = hashes.find(hashType);
if (i == hashes.end()) {
return nullptr;
}
return std::get<0>(i->second)();
}
inline static bool supports(const std::string& hashType)
{
auto i = hashes.find(hashType);
return i != hashes.end();
}
inline static size_t getDigestLength(const std::string& hashType)
{
auto i = hashes.find(hashType);
if (i == hashes.end()) {
return 0;
}
return std::get<1>(i->second);
}
public:
virtual size_t getDigestLength() const = 0;
virtual void reset() = 0;
virtual void update(const void* data, size_t length) = 0;
virtual void digest(unsigned char* md) = 0;
protected:
MessageDigestImpl() {}
};
} // namespace aria2
#endif // D_MESSAGE_DIGEST_IMPL_H
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