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| -rw-r--r-- | src/common/include/gudhi/Points_fvecs_reader.h | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/src/common/include/gudhi/Points_fvecs_reader.h b/src/common/include/gudhi/Points_fvecs_reader.h new file mode 100644 index 00000000..eb03bb72 --- /dev/null +++ b/src/common/include/gudhi/Points_fvecs_reader.h @@ -0,0 +1,68 @@ +/* This file is part of the Gudhi Library. The Gudhi library + * (Geometric Understanding in Higher Dimensions) is a generic C++ + * library for computational topology. + * + * Author(s): Vincent Rouvreau + * + * Copyright (C) 2015 INRIA Saclay (France) + * + * This program 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. + * + * This program 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/>. + */ +#ifndef POINTS_FVECS_READER_H_ +#define POINTS_FVECS_READER_H_ + +namespace Gudhi { + +template<typename Kernel, typename OutputIteratorPoints> +bool load_points_from_fvecs_file(const std::string &filename, OutputIteratorPoints points, int only_the_first_n_points = -1) +{ + typedef typename Kernel::Point_d Point; + + std::ifstream in(filename, std::ios::binary); + if (!in.is_open()) { + std::cerr << "Could not open '" << filename << "'" << std::endl; + return false; + } + + Kernel k; + unsigned long pt_dim = 0; + + in.read(reinterpret_cast<char*>(&pt_dim), 4); + std::vector<float> current_pt; + current_pt.reserve(pt_dim); + for (int c = 0; !in.fail() && c != only_the_first_n_points; ++c) { + + for (int j = 0; j < pt_dim; ++j) + { + float coord = 0.f; + in.read(reinterpret_cast<char*>(&coord), 4); + current_pt.push_back(coord); + } + + *points++ = Point(current_pt.begin(), current_pt.end()); + current_pt.clear(); + in.read(reinterpret_cast<char*>(&pt_dim), 4); + } + +#ifdef DEBUG_TRACES + std::cerr << "'" << filename << "' loaded." << std::endl; +#endif + + return true; +} + + +} // namespace Gudhi + +#endif // POINTS_FVECS_READER_H_ |