/
OpeningBook.hpp
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/
OpeningBook.hpp
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/*
* This file is part of Connect4 Game Solver <http://connect4.gamesolver.org>
* Copyright (C) 2017-2019 Pascal Pons <contact@gamesolver.org>
*
* Connect4 Game Solver is free software: you can redistribute it and/or
* modify it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* Connect4 Game Solver 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Connect4 Game Solver. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef OPENING_BOOK_HPP
#define OPENING_BOOK_HPP
#include <iostream>
#include <fstream>
#include "Position.hpp"
#include "TranspositionTable.hpp"
namespace GameSolver {
namespace Connect4 {
class OpeningBook {
TableGetter<Position::position_t, uint8_t> *T;
const int width;
const int height;
int depth;
template<class partial_key_t>
TableGetter<Position::position_t, uint8_t>* initTranspositionTable(int log_size) {
switch(log_size) {
case 21:
return new TranspositionTable<partial_key_t, Position::position_t, uint8_t, 21>();
case 22:
return new TranspositionTable<partial_key_t, Position::position_t, uint8_t, 22>();
case 23:
return new TranspositionTable<partial_key_t, Position::position_t, uint8_t, 23>();
case 24:
return new TranspositionTable<partial_key_t, Position::position_t, uint8_t, 24>();
case 25:
return new TranspositionTable<partial_key_t, Position::position_t, uint8_t, 25>();
case 26:
return new TranspositionTable<partial_key_t, Position::position_t, uint8_t, 26>();
case 27:
return new TranspositionTable<partial_key_t, Position::position_t, uint8_t, 27>();
default:
std::cerr << "Unimplemented OpeningBook size: " << log_size << std::endl;
return 0;
}
}
TableGetter<Position::position_t, uint8_t>* initTranspositionTable(int partial_key_bytes, int log_size) {
switch(partial_key_bytes) {
case 1:
return initTranspositionTable<uint8_t>(log_size);
case 2:
return initTranspositionTable<uint16_t>(log_size);
case 4:
return initTranspositionTable<uint32_t>(log_size);
default:
std::cerr << "Invalid internal key size: " << partial_key_bytes << " bytes" << std::endl;
return 0;
}
}
public:
OpeningBook(int width, int height) : T{0}, width{width}, height{height}, depth{ -1} {} // Empty opening book
OpeningBook(int width, int height, int depth, TableGetter<Position::position_t, uint8_t>* T) : T{T}, width{width}, height{height}, depth{depth} {} // Empty opening book
/**
* Opening book file format:
* - 1 byte: board width
* - 1 byte: board height
* - 1 byte: max stored position depth
* - 1 byte: key size in bits
* - 1 byte: value size in bits
* - 1 byte: log_size = log2(size). number of stored elements (size) is smallest prime number above 2^(log_size)
* - size key elements
* - size value elements
*/
void load(std::string filename) {
depth = -1;
delete T;
std::ifstream ifs(filename, std::ios::binary); // open file
if(ifs.fail()) {
std::cerr << "Unable to load opening book: " << filename << std::endl;
return;
} else std::cerr << "Loading opening book from file: " << filename << ". ";
char _width, _height, _depth, value_bytes, partial_key_bytes, log_size;
ifs.read(&_width, 1);
if(ifs.fail() || _width != width) {
std::cerr << "Unable to load opening book: invalid width (found: " << int(_width) << ", expected: " << width << ")" << std::endl;
return;
}
ifs.read(&_height, 1);
if(ifs.fail() || _height != height) {
std::cerr << "Unable to load opening book: invalid height(found: " << int(_height) << ", expected: " << height << ")" << std::endl;
return;
}
ifs.read(&_depth, 1);
if(ifs.fail() || _depth > width * height) {
std::cerr << "Unable to load opening book: invalid depth (found: " << int(_depth) << ")" << std::endl;
return;
}
ifs.read(&partial_key_bytes, 1);
if(ifs.fail() || partial_key_bytes > 8) {
std::cerr << "Unable to load opening book: invalid internal key size(found: " << int(partial_key_bytes) << ")" << std::endl;
return;
}
ifs.read(&value_bytes, 1);
if(ifs.fail() || value_bytes != 1) {
std::cerr << "Unable to load opening book: invalid value size (found: " << int(value_bytes) << ", expected: 1)" << std::endl;
return;
}
ifs.read(&log_size, 1);
if(ifs.fail() || log_size > 40) {
std::cerr << "Unable to load opening book: invalid log2(size)(found: " << int(log_size) << ")" << std::endl;
return;
}
if((T = initTranspositionTable(partial_key_bytes, log_size))) {
ifs.read(reinterpret_cast<char *>(T->getKeys()), T->getSize() * partial_key_bytes);
ifs.read(reinterpret_cast<char *>(T->getValues()), T->getSize() * value_bytes);
if(ifs.fail()) {
std::cerr << "Unable to load data from opening book" << std::endl;
return;
}
depth = _depth; // set it in case of success only, keep -1 in case of failure
std::cerr << "done" << std::endl;
}
else std::cerr << "Unable to initialize opening book" << std::endl;
ifs.close();
}
void save(const std::string output_file) const {
std::ofstream ofs(output_file, std::ios::binary);
char tmp;
tmp = width;
ofs.write(&tmp, 1);
tmp = height;
ofs.write(&tmp, 1);
tmp = depth;
ofs.write(&tmp, 1);
tmp = T->getKeySize();
ofs.write(&tmp, 1);
tmp = T->getValueSize();
ofs.write(&tmp, 1);
tmp = log2(T->getSize());
ofs.write(&tmp, 1);
ofs.write(reinterpret_cast<const char *>(T->getKeys()), T->getSize() * T->getKeySize());
ofs.write(reinterpret_cast<const char *>(T->getValues()), T->getSize() * T->getValueSize());
ofs.close();
}
int get(const Position &P) const {
if(P.nbMoves() > depth) return 0;
else return T->get(P.key3());
}
~OpeningBook() {
delete T;
}
};
} // namespace Connect4
} // namespace GameSolver
#endif