90 lines
1.8 KiB
C++
90 lines
1.8 KiB
C++
/*
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Glaurung, a UCI chess playing engine.
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Copyright (C) 2004-2008 Tord Romstad
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Glaurung is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Glaurung is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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The code in this file is based on the opening book code in PolyGlot
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by Fabien Letouzey. PolyGlot is available under the GNU General
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Public License, and can be downloaded from http://wbec-ridderkerk.nl
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*/
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#if !defined(BOOK_H_INCLUDED)
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#define BOOK_H_INCLUDED
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////
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//// Includes
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////
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#include <string>
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#include "move.h"
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#include "position.h"
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////
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//// Types
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////
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struct BookEntry {
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uint64_t key;
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uint16_t move;
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uint16_t count;
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uint16_t n;
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uint16_t sum;
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};
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class Book {
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public:
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// Constructors
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Book();
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// Open and close book files
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void open(const std::string &fName);
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void close();
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// Testing if a book is opened
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bool is_open() const;
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// The file name of the currently active book
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const std::string file_name() const;
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// Get a book move for a given position
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Move get_move(const Position &pos) const;
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private:
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int find_key(uint64_t key) const;
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void read_entry(BookEntry &entry, int n) const;
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std::string fileName;
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FILE *bookFile;
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int bookSize;
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};
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////
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//// Global variables
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////
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extern Book OpeningBook;
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#endif // !defined(BOOK_H_INCLUDED)
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