/*
 * Copyright (C) 2001-2024 Jacek Sieka, arnetheduck on gmail point com
 *
 * 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 3 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifndef DCPLUSPLUS_DCPP_CID_H
#define DCPLUSPLUS_DCPP_CID_H


namespace dcpp {

class CID {
public:
	enum { SIZE = 192 / 8 };

	CID() { memzero(cid, sizeof(cid)); }
	explicit CID(const uint8_t* data) { memcpy(cid, data, sizeof(cid)); }
	explicit CID(const string& base32);

	bool operator==(const CID& rhs) const noexcept { return memcmp(cid, rhs.cid, sizeof(cid)) == 0; }
	bool operator<(const CID& rhs) const noexcept { return memcmp(cid, rhs.cid, sizeof(cid)) < 0; }

	string toBase32() const;
	string& toBase32(string& tmp) const;

	operator std::string() const { return toBase32(); }

	size_t toHash() const {
		// RVO should handle this as efficiently as reinterpret_cast version
		size_t cidHash;
		memcpy(&cidHash, cid, sizeof(size_t));
		return cidHash;
	}
	const uint8_t* data() const noexcept { return cid; }
	
	explicit operator bool() const noexcept { return find_if(cid, cid + SIZE, [](uint8_t c) { return c != 0; }) != cid + SIZE; }

	static CID generate();

private:
	uint8_t cid[SIZE];
};

} // namespace dcpp

namespace std { 
template<>
struct hash<dcpp::CID> {
	size_t operator()(const dcpp::CID& rhs) const {
		size_t hvHash;
		memcpy(&hvHash, rhs.data(), sizeof(size_t));
		return hvHash;
	}
};

template<>
struct hash<dcpp::CID*> {
	size_t operator()(const dcpp::CID* rhs) const {
		return *reinterpret_cast<const size_t*>(rhs);
	}
};

template<>
struct equal_to<dcpp::CID*> {
	bool operator()(const dcpp::CID* lhs, const dcpp::CID* rhs) const {
		return (*lhs) == (*rhs);
	}
};
}

#endif // !defined(CID_H)