3
0
mirror of https://github.com/triqs/dft_tools synced 2024-12-25 05:43:40 +01:00
dft_tools/triqs/h5/serialization.hpp
Olivier Parcollet 4af1afbdaf hdf5 : clean up
- 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.
2014-06-22 13:57:47 +02:00

86 lines
2.8 KiB
C++

/*******************************************************************************
*
* TRIQS: a Toolbox for Research in Interacting Quantum Systems
*
* Copyright (C) 2012 by M. Ferrero, O. Parcollet
*
* TRIQS 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.
*
* TRIQS 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
* TRIQS. If not, see <http://www.gnu.org/licenses/>.
*
******************************************************************************/
#pragma once
#include "./base.hpp"
//#define CHECK_OR_THROW(Cond, Mess)
#define CHECK_OR_THROW(Cond, Mess) \
if (!(Cond)) TRIQS_RUNTIME_ERROR << "Error in h5 (de)serialization " << Mess;
namespace triqs {
namespace h5 {
template <typename T> std::string serialize(T const &x) {
proplist fapl = H5Pcreate(H5P_FILE_ACCESS);
CHECK_OR_THROW((fapl >= 0), "creating fapl");
auto err = H5Pset_fapl_core(fapl, (size_t)(64 * 1024), false);
CHECK_OR_THROW((err >= 0), "setting core file driver in fapl.");
h5::file f = H5Fcreate("serialization", 0, H5P_DEFAULT, fapl);
CHECK_OR_THROW((f.is_valid()), "created core file");
auto gr = triqs::h5::group(f);
h5_write(gr, "object", x);
err = H5Fflush(f, H5F_SCOPE_GLOBAL);
CHECK_OR_THROW((err >= 0), "flushed core file.");
ssize_t image_len = H5Fget_file_image(f, NULL, (size_t)0);
CHECK_OR_THROW((image_len > 0), "got image file size");
std::string buf(image_len, 0);
ssize_t bytes_read = H5Fget_file_image(f, (void *)&buf[0], (size_t)image_len);
CHECK_OR_THROW(bytes_read == image_len, "wrote file into image buffer");
return buf;
}
// -----------------------------
template <typename T> T deserialize(std::string const &buf) {
T res;
proplist fapl = H5Pcreate(H5P_FILE_ACCESS);
CHECK_OR_THROW((fapl >= 0), "creating fapl");
auto err = H5Pset_fapl_core(fapl, (size_t)(64 * 1024), false);
CHECK_OR_THROW((err >= 0), "setting core file driver in fapl.");
err = H5Pset_file_image(fapl, (void *)&buf[0], buf.size());
CHECK_OR_THROW((err >= 0), "set file image in fapl.");
h5::file f = H5Fopen("serialization", H5F_ACC_RDONLY, fapl);
CHECK_OR_THROW((f.is_valid()), "opened received file image file");
auto gr = triqs::h5::group(f);
h5_read(gr, "object", res);
return res;
}
}
#undef CHECK_OR_THROW
}