mirror of
https://github.com/triqs/dft_tools
synced 2024-11-01 19:53:45 +01:00
4af1afbdaf
- For users : only change is :
H5::H5File in apps. to be replaced by triqs::h5::file, same API.
- using only the C API because :
- it is cleaner, better documented, more examples.
- it is the native hdf5 interface.
- simplify the installation e.g. on mac. Indeed, hdf5 is
usually installed without C++ interface, which is optional.
E.g. EPD et al., brew by default.
Also the infamous mpi+ hdf5_cpp bug, for which we have no clean solution.
- clean the notion of parent of a group. Not needed, better iterate function in C LT API.
- modified doc : no need for C++ bindings any more.
- modified cmake to avoid requiring CPP bindings.
86 lines
2.8 KiB
C++
86 lines
2.8 KiB
C++
/*******************************************************************************
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*
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* TRIQS: a Toolbox for Research in Interacting Quantum Systems
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*
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* Copyright (C) 2012 by M. Ferrero, O. Parcollet
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*
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* TRIQS is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* TRIQS. If not, see <http://www.gnu.org/licenses/>.
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*
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******************************************************************************/
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#pragma once
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#include "./base.hpp"
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//#define CHECK_OR_THROW(Cond, Mess)
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#define CHECK_OR_THROW(Cond, Mess) \
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if (!(Cond)) TRIQS_RUNTIME_ERROR << "Error in h5 (de)serialization " << Mess;
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namespace triqs {
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namespace h5 {
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template <typename T> std::string serialize(T const &x) {
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proplist fapl = H5Pcreate(H5P_FILE_ACCESS);
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CHECK_OR_THROW((fapl >= 0), "creating fapl");
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auto err = H5Pset_fapl_core(fapl, (size_t)(64 * 1024), false);
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CHECK_OR_THROW((err >= 0), "setting core file driver in fapl.");
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h5::file f = H5Fcreate("serialization", 0, H5P_DEFAULT, fapl);
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CHECK_OR_THROW((f.is_valid()), "created core file");
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auto gr = triqs::h5::group(f);
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h5_write(gr, "object", x);
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err = H5Fflush(f, H5F_SCOPE_GLOBAL);
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CHECK_OR_THROW((err >= 0), "flushed core file.");
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ssize_t image_len = H5Fget_file_image(f, NULL, (size_t)0);
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CHECK_OR_THROW((image_len > 0), "got image file size");
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std::string buf(image_len, 0);
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ssize_t bytes_read = H5Fget_file_image(f, (void *)&buf[0], (size_t)image_len);
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CHECK_OR_THROW(bytes_read == image_len, "wrote file into image buffer");
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return buf;
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}
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// -----------------------------
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template <typename T> T deserialize(std::string const &buf) {
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T res;
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proplist fapl = H5Pcreate(H5P_FILE_ACCESS);
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CHECK_OR_THROW((fapl >= 0), "creating fapl");
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auto err = H5Pset_fapl_core(fapl, (size_t)(64 * 1024), false);
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CHECK_OR_THROW((err >= 0), "setting core file driver in fapl.");
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err = H5Pset_file_image(fapl, (void *)&buf[0], buf.size());
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CHECK_OR_THROW((err >= 0), "set file image in fapl.");
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h5::file f = H5Fopen("serialization", H5F_ACC_RDONLY, fapl);
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CHECK_OR_THROW((f.is_valid()), "opened received file image file");
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auto gr = triqs::h5::group(f);
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h5_read(gr, "object", res);
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return res;
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}
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}
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#undef CHECK_OR_THROW
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}
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