67 lines
2.3 KiB
C
67 lines
2.3 KiB
C
/*
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* This file is part of pgn-extract: a Portable Game Notation (PGN) extractor.
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* Copyright (C) 1994-2022 David J. Barnes
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*
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* pgn-extract 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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*
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* pgn-extract 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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*
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* You should have received a copy of the GNU General Public License
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* along with pgn-extract. If not, see <http://www.gnu.org/licenses/>.
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*
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* David J. Barnes may be contacted as d.j.barnes@kent.ac.uk
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* https://www.cs.kent.ac.uk/people/staff/djb/
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*/
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/* Define a type to hold hash values of interest.
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* This is used both to aid in duplicate detection
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* and in finding positional variations.
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*/
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#ifndef HASHING_H
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#define HASHING_H
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typedef struct HashLog {
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/* Store both the final position hash value and
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* the cumulative hash value for a game.
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*/
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HashCode final_hash_value;
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HashCode cumulative_hash_value;
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/* Record the file list index for the file this game was first found in. */
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unsigned file_number;
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struct HashLog *next;
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} HashLog;
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/*
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* A structure for counting the number of times a position arises
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* in a game.
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*/
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typedef struct PositionCount {
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HashCode hash_value;
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Colour to_move;
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unsigned short castling_rights;
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Rank ep_rank;
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Col ep_col;
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unsigned count;
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struct PositionCount *next;
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} PositionCount;
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Boolean check_duplicate_setup(const Game *game_details);
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Boolean check_for_only_repetition(PositionCount *position_counts);
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void clear_duplicate_hash_table(void);
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PositionCount *copy_position_count_list(PositionCount *original);
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void free_position_count_list(PositionCount *position_counts);
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void init_duplicate_hash_table(void);
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PositionCount *new_position_count_list(const Board *board);
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const char *previous_occurance(Game game_details, unsigned plycount);
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unsigned update_position_counts(PositionCount *position_counts, const Board *board);
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#endif // HASHING_H
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