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72 lines
2.1 KiB
C
72 lines
2.1 KiB
C
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/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
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Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
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Stockfish 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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Stockfish 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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#if !defined(BOOK_H_INCLUDED)
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#define BOOK_H_INCLUDED
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#include <fstream>
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#include <string>
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#include "move.h"
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#include "position.h"
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#include "rkiss.h"
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// A Polyglot book is a series of "entries" of 16 bytes. All integers are
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// stored highest byte first (regardless of size). The entries are ordered
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// according to key. Lowest key first.
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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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uint32_t learn;
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};
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class Book {
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public:
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Book();
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~Book();
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void open(const std::string& fileName);
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void close();
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Move get_move(const Position& pos, bool findBestMove);
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const std::string name() const { return bookName; }
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private:
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// read n chars from the file stream and converts them in an
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// integer number. Integers are stored with highest byte first.
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template<int n> uint64_t get_int();
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template<typename T>
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Book& operator>>(T& n) { n = (T)get_int<sizeof(T)>(); return *this; }
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BookEntry read_entry(int idx);
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int find_entry(uint64_t key);
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std::ifstream bookFile;
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std::string bookName;
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int bookSize;
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RKISS RKiss;
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};
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// Yes, we indulge a bit here ;-)
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template<int n> inline uint64_t Book::get_int() { return 256 * get_int<n-1>() + bookFile.get(); }
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template<> inline uint64_t Book::get_int<1>() { return bookFile.get(); }
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#endif // !defined(BOOK_H_INCLUDED)
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