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// Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
// at the Lawrence Livermore National Laboratory. All Rights reserved. See files
// LICENSE and NOTICE for details. LLNL-CODE-443271.
//
// This file is part of the GLVis visualization tool and library. For more
// information and source code availability see https://glvis.org.
//
// GLVis is free software; you can redistribute it and/or modify it under the
// terms of the BSD-3 license. We welcome feedback and contributions, see file
// CONTRIBUTING.md for details.
#include "file_reader.hpp"
#include <vector>
using namespace std;
using namespace mfem;
int FileReader::ReadSerial(FileReader::FileType ft, const char *mesh_file,
const char *sol_file, int component)
{
// get the mesh from a file
named_ifgzstream meshin(mesh_file);
if (!meshin)
{
cerr << "Can not open mesh file " << mesh_file << ". Exit.\n";
return 1;
}
data.SetMesh(new Mesh(meshin, 1, 0, data.fix_elem_orient));
if (ft == FileType::MESH)
{
data.SetMeshSolution();
}
else
{
// get the solution from file
shared_ptr<ifgzstream> solin;
if (!strcmp(mesh_file, sol_file))
{
solin.reset(&meshin, [](ifgzstream*) {}); // no op deleter
}
else
{
solin.reset(new ifgzstream(sol_file));
if (!(*solin))
{
cerr << "Can not open solution file " << sol_file << ". Exit.\n";
return 2;
}
}
switch (ft)
{
case FileType::GRID_FUNC:
data.SetGridFunction(new GridFunction(data.mesh.get(), *solin), component);
break;
case FileType::QUAD_FUNC:
data.SetQuadFunction(new QuadratureFunction(data.mesh.get(), *solin),
component);
break;
case FileType::SCALAR_SOL:
{
// get rid of NetGen's info line
char buff[128];
solin->getline(buff,128);
data.sol.Load(*solin, data.mesh->GetNV());
data.type = DataState::FieldType::SCALAR;
}
break;
case FileType::VECTOR_SOL:
data.solu.Load(*solin, data.mesh->GetNV());
data.solv.Load(*solin, data.mesh->GetNV());
if (data.mesh->SpaceDimension() == 3)
{
data.solw.Load(*solin, data.mesh->GetNV());
}
data.type = DataState::FieldType::VECTOR;
break;
default:
cerr << "Unknown file type. Exit" << endl;
exit(1);
}
}
data.ExtrudeMeshAndSolution();
return 0;
}
int FileReader::ReadParallel(int np, FileType ft, const char *mesh_file,
const char *sol_file, int component)
{
int read_err;
switch (ft)
{
case FileType::MESH:
read_err = ReadParMeshAndGridFunction(np, mesh_file, NULL);
break;
case FileType::GRID_FUNC:
read_err = ReadParMeshAndGridFunction(np, mesh_file, sol_file, component);
break;
case FileType::QUAD_FUNC:
read_err = ReadParMeshAndQuadFunction(np, mesh_file, sol_file, component);
break;
default:
cerr << "Unknown file type. Exit" << endl;
exit(1);
}
if (!read_err)
{
data.ExtrudeMeshAndSolution();
}
return read_err;
}
int FileReader::ReadParMeshAndGridFunction(int np, const char *mesh_prefix,
const char *sol_prefix, int component)
{
data.SetMesh(NULL);
// are the solutions bundled together with the mesh files?
bool same_file = false;
if (sol_prefix)
{
same_file = !strcmp(sol_prefix, mesh_prefix);
data.SetGridFunction(NULL);
}
std::vector<Mesh *> mesh_array(np);
std::vector<GridFunction *> gf_array(np);
int read_err = 0;
for (int p = 0; p < np; p++)
{
ostringstream fname;
fname << mesh_prefix << '.' << setfill('0') << setw(pad_digits) << p;
named_ifgzstream meshfile(fname.str().c_str());
if (!meshfile)
{
cerr << "Could not open mesh file: " << fname.str() << '!' << endl;
read_err = 1;
break;
}
mesh_array[p] = new Mesh(meshfile, 1, 0, data.fix_elem_orient);
if (!data.keep_attr)
{
// set element and boundary attributes to be the processor number + 1
for (int i = 0; i < mesh_array[p]->GetNE(); i++)
{
mesh_array[p]->GetElement(i)->SetAttribute(p+1);
}
for (int i = 0; i < mesh_array[p]->GetNBE(); i++)
{
mesh_array[p]->GetBdrElement(i)->SetAttribute(p+1);
}
}
// read the solution
if (sol_prefix)
{
if (!same_file)
{
ostringstream sol_fname;
sol_fname << sol_prefix << '.' << setfill('0') << setw(pad_digits) << p;
ifgzstream solfile(sol_fname.str().c_str());
if (!solfile)
{
cerr << "Could not open solution file "
<< sol_fname.str() << '!' << endl;
read_err = 2;
break;
}
gf_array[p] = new GridFunction(mesh_array[p], solfile);
}
else // mesh and solution in the same file
{
gf_array[p] = new GridFunction(mesh_array[p], meshfile);
}
}
}
if (!read_err)
{
// create the combined mesh and gf
data.SetMesh(new Mesh(mesh_array.data(), np));
if (sol_prefix)
{
data.SetGridFunction(new GridFunction(data.mesh.get(), gf_array.data(), np),
component);
}
else
{
data.SetMeshSolution();
}
}
for (int p = 0; p < np; p++)
{
delete gf_array[np-1-p];
delete mesh_array[np-1-p];
}
return read_err;
}
int FileReader::ReadParMeshAndQuadFunction(int np, const char *mesh_prefix,
const char *sol_prefix, int component)
{
data.SetMesh(NULL);
// are the solutions bundled together with the mesh files?
bool same_file = false;
if (sol_prefix)
{
same_file = !strcmp(sol_prefix, mesh_prefix);
data.SetGridFunction(NULL);
}
std::vector<Mesh*> mesh_array(np);
std::vector<QuadratureFunction*> qf_array(np);
int read_err = 0;
for (int p = 0; p < np; p++)
{
ostringstream fname;
fname << mesh_prefix << '.' << setfill('0') << setw(pad_digits) << p;
named_ifgzstream meshfile(fname.str().c_str());
if (!meshfile)
{
cerr << "Could not open mesh file: " << fname.str() << '!' << endl;
read_err = 1;
break;
}
mesh_array[p] = new Mesh(meshfile, 1, 0, data.fix_elem_orient);
if (!data.keep_attr)
{
// set element and boundary attributes to be the processor number + 1
for (int i = 0; i < mesh_array[p]->GetNE(); i++)
{
mesh_array[p]->GetElement(i)->SetAttribute(p+1);
}
for (int i = 0; i < mesh_array[p]->GetNBE(); i++)
{
mesh_array[p]->GetBdrElement(i)->SetAttribute(p+1);
}
}
// read the solution
if (sol_prefix)
{
if (!same_file)
{
ostringstream sol_fname;
sol_fname << sol_prefix << '.' << setfill('0') << setw(pad_digits) << p;
ifgzstream solfile(sol_fname.str().c_str());
if (!solfile)
{
cerr << "Could not open solution file "
<< sol_fname.str() << '!' << endl;
read_err = 2;
break;
}
qf_array[p] = new QuadratureFunction(mesh_array[p], solfile);
}
else // mesh and solution in the same file
{
qf_array[p] = new QuadratureFunction(mesh_array[p], meshfile);
}
}
}
if (!read_err)
{
// create the combined mesh and gf
data.SetMesh(new Mesh(mesh_array.data(), np));
if (sol_prefix)
{
data.SetQuadFunction(qf_array, component);
}
else
{
data.SetMeshSolution();
}
}
for (int p = 0; p < np; p++)
{
delete qf_array[np-1-p];
delete mesh_array[np-1-p];
}
return read_err;
}
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