/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef NUVIE_MISC_U6_LIST_H
#define NUVIE_MISC_U6_LIST_H

namespace Ultima {
namespace Nuvie {

#define U6LLIST_FREE_DATA true

struct U6Link {
	U6Link *next;
	U6Link *prev;
	void *data;
	uint8 ref_count;
	U6Link() {
		next = nullptr;
		prev = nullptr;
		data = nullptr;
		ref_count = 1;
	}
};

void retainU6Link(U6Link *link);
void releaseU6Link(U6Link *link);

class U6LList {
	U6Link *head;
	U6Link *tail;

public:

	U6LList();
	~U6LList();

	bool add(void *data);
	bool addAtPos(uint32 pos, void *data);

	uint32 findPos(void *data);
	bool replace(void *old_data, void *new_data);

	bool remove(void *data);
	bool removeAll();

	uint32 count() const;

	U6Link *start();
	U6Link *end();
	const U6Link *start() const;
	const U6Link *end() const;

	U6Link *gotoPos(uint32 pos);
};

} // End of namespace Nuvie
} // End of namespace Ultima

#endif