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https://github.com/HChaZZY/Stockfish.git
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2535dc1340
Bug is subtle because appears only under MSVC 32 bits in optimized version, hence was missed before. Bug is due to the fact that evaluation order of terms of a sum is undefined by the standard, so in get_int() we have: return 256 * get_int<n-1>() + bookFile.get(); And if get() is evaluated before get_int() we have a corrupted key. The patch rewrites the code in a more natural and predictable way. No functional change. Signed-off-by: Marco Costalba <mcostalba@gmail.com>
63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
/*
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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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template<typename T> void get_number(T& n);
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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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#endif // !defined(BOOK_H_INCLUDED)
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