bestiary.h

/* 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 MM1_DATA_BESTIARY_H
#define MM1_DATA_BESTIARY_H
 
#include "common/stream.h"
#include "mm/mm1/data/monsters.h"
 
namespace MM {
namespace MM1 {
 
class BestiaryState {
private:
    byte _seen[(MONSTERS_COUNT + 7) / 8] = {};
 
public:
    void clear() {
        memset(_seen, 0, sizeof(_seen));
    }
 
    bool hasSeen(uint id) const {
        return id >= 1 && id <= MONSTERS_COUNT &&
            (_seen[(id - 1) / 8] & (1 << ((id - 1) % 8)));
    }
 
    void discover(uint id) {
        if (id >= 1 && id <= MONSTERS_COUNT)
            _seen[(id - 1) / 8] |= 1 << ((id - 1) % 8);
    }
 
    uint count() const {
        uint result = 0;
        for (uint id = 1; id <= MONSTERS_COUNT; ++id) {
            if (hasSeen(id))
                ++result;
        }
 
        return result;
    }
 
    void save(Common::WriteStream &stream) const {
        stream.writeUint32BE(0x42535431);   // 'BST1' extension marker
        stream.writeUint16BE(MONSTERS_COUNT);
        stream.write(_seen, sizeof(_seen));
    }
 
    void load(Common::SeekableReadStream &stream) {
        clear();
 
        const int64 start = stream.pos();
        if (stream.size() - start < 6 + (int64)sizeof(_seen))
            return;
 
        if (stream.readUint32BE() != 0x42535431 ||
                stream.readUint16BE() != MONSTERS_COUNT) {
            stream.seek(start);
            return;
        }
 
        if (stream.read(_seen, sizeof(_seen)) != sizeof(_seen))
            clear();
    }
};
 
} // namespace MM1
} // namespace MM
 
#endif