Initial import of Glaurung 2.1

src/book.h

@@ -0,0 +1,89 @@
+/*
+  Glaurung, a UCI chess playing engine.
+  Copyright (C) 2004-2008 Tord Romstad
+
+  Glaurung 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.
+  
+  Glaurung 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/>.
+*/
+
+
+/*
+  The code in this file is based on the opening book code in PolyGlot
+  by Fabien Letouzey.  PolyGlot is available under the GNU General
+  Public License, and can be downloaded from http://wbec-ridderkerk.nl
+*/
+
+
+#if !defined(BOOK_H_INCLUDED)
+#define BOOK_H_INCLUDED
+
+
+////
+//// Includes
+////
+
+#include <string>
+
+#include "move.h"
+#include "position.h"
+
+
+////
+//// Types
+////
+
+struct BookEntry {
+  uint64_t key;
+  uint16_t move;
+  uint16_t count;
+  uint16_t n;
+  uint16_t sum;
+};
+
+class Book {
+
+public:
+  // Constructors
+  Book();
+
+  // Open and close book files
+  void open(const std::string &fName);
+  void close();
+
+  // Testing if a book is opened
+  bool is_open() const;
+
+  // The file name of the currently active book
+  const std::string file_name() const;
+
+  // Get a book move for a given position
+  Move get_move(const Position &pos) const;
+
+private:
+  int find_key(uint64_t key) const;
+  void read_entry(BookEntry &entry, int n) const;
+
+  std::string fileName;
+  FILE *bookFile;
+  int bookSize;
+};
+
+
+////
+//// Global variables
+////
+
+extern Book OpeningBook;
+
+
+#endif // !defined(BOOK_H_INCLUDED)