// This helper function converts the given element identifier string and number of nodes to
// our own element enumerated type.
static fe_mesh_element_t get_element_type(const char* elem_type_id)
{
if (string_ncasecmp(elem_type_id, "nfaced", 6) == 0)
return FE_POLYHEDRON;
else if (string_ncasecmp(elem_type_id, "tetra", 5) == 0)
return FE_TETRAHEDRON;
else if (string_ncasecmp(elem_type_id, "pyramid", 7) == 0)
return FE_PYRAMID;
else if (string_ncasecmp(elem_type_id, "wedge", 5) == 0)
return FE_WEDGE;
else if (string_ncasecmp(elem_type_id, "hex", 3) == 0)
return FE_HEXAHEDRON;
else
return FE_INVALID;
}
Variant f_substr_compare(CStrRef main_str, CStrRef str, int offset,
int length /* = 0 */,
bool case_insensitivity /* = false */) {
int s1_len = main_str.size();
int s2_len = str.size();
if (offset < 0) {
offset = s1_len + offset;
if (offset < 0) offset = 0;
}
if (offset > s1_len || length > s1_len - offset) {
return false;
}
int cmp_len = length;
if (length == 0) {
cmp_len = s1_len - offset;
if (cmp_len < s2_len) cmp_len = s2_len;
}
const char *s1 = main_str.data();
if (case_insensitivity) {
return string_ncasecmp(s1 + offset, str, cmp_len);
}
return string_ncmp(s1 + offset, str, cmp_len);
}
int is_uri_protocol(UriUriA *uri, const char *protocol)
{
if (!uri || !uri->scheme.first || !uri->scheme.afterLast)
return 0;
if (((size_t) (uri->scheme.afterLast - uri->scheme.first)) == strlen(protocol)
&& !string_ncasecmp(uri->scheme.first, protocol, uri->scheme.afterLast - uri->scheme.first))
return 1;
return 0;
}
int is_same_mimetype(const char *type1, const char *type2)
{
return !string_ncasecmp(type1, type2, strlen(type2));
}
fe_mesh_t* exodus_file_read_mesh(exodus_file_t* file)
{
// Create the "host" FE mesh.
fe_mesh_t* mesh = fe_mesh_new(file->comm, file->num_nodes);
// Count up the number of polyhedral blocks.
int num_poly_blocks = 0;
for (int i = 0; i < file->num_elem_blocks; ++i)
{
int elem_block = file->elem_block_ids[i];
char elem_type_name[MAX_NAME_LENGTH+1];
int num_elem, num_nodes_per_elem, num_faces_per_elem;
ex_get_block(file->ex_id, EX_ELEM_BLOCK, elem_block,
elem_type_name, &num_elem,
&num_nodes_per_elem, NULL,
&num_faces_per_elem, NULL);
fe_mesh_element_t elem_type = get_element_type(elem_type_name);
if (elem_type == FE_POLYHEDRON)
++num_poly_blocks;
}
// If we have any polyhedral element blocks, we read a single face
// block that incorporates all of the polyhedral elements.
if (num_poly_blocks > 0)
{
// Dig up the face block corresponding to this element block.
char face_type[MAX_NAME_LENGTH+1];
int num_faces, num_nodes;
ex_get_block(file->ex_id, EX_FACE_BLOCK, file->face_block_ids[0], face_type, &num_faces,
&num_nodes, NULL, NULL, NULL);
if (string_ncasecmp(face_type, "nsided", 6) != 0)
{
fe_mesh_free(mesh);
ex_close(file->ex_id);
polymec_error("Invalid face type for polyhedral element block.");
}
// Find the number of nodes for each face in the block.
int* num_face_nodes = polymec_malloc(sizeof(int) * num_faces);
ex_get_entity_count_per_polyhedra(file->ex_id, EX_FACE_BLOCK,
file->face_block_ids[0],
num_face_nodes);
// Read face->node connectivity information.
int face_node_size = 0;
for (int i = 0; i < num_faces; ++i)
face_node_size += num_face_nodes[i];
int* face_nodes = polymec_malloc(sizeof(int) * face_node_size);
ex_get_conn(file->ex_id, EX_FACE_BLOCK, 1, face_nodes, NULL, NULL);
for (int i = 0; i < face_node_size; ++i)
face_nodes[i] -= 1;
fe_mesh_set_face_nodes(mesh, num_faces, num_face_nodes, face_nodes);
// Clean up.
polymec_free(num_face_nodes);
}
// Go over the element blocks and feel out the data.
for (int i = 0; i < file->num_elem_blocks; ++i)
{
int elem_block = file->elem_block_ids[i];
char elem_type_name[MAX_NAME_LENGTH+1];
int num_elem, num_nodes_per_elem, num_faces_per_elem;
ex_get_block(file->ex_id, EX_ELEM_BLOCK, elem_block,
elem_type_name, &num_elem,
&num_nodes_per_elem, NULL,
&num_faces_per_elem, NULL);
// Get the type of element for this block.
fe_mesh_element_t elem_type = get_element_type(elem_type_name);
fe_block_t* block = NULL;
char block_name[MAX_NAME_LENGTH+1];
if (elem_type == FE_POLYHEDRON)
{
// Find the number of faces for each element in the block.
int* num_elem_faces = polymec_malloc(sizeof(int) * num_elem);
ex_get_entity_count_per_polyhedra(file->ex_id, EX_ELEM_BLOCK, elem_block,
num_elem_faces);
// Get the element->face connectivity.
int elem_face_size = 0;
for (int j = 0; j < num_elem; ++j)
elem_face_size += num_elem_faces[j];
int* elem_faces = polymec_malloc(sizeof(int) * elem_face_size);
ex_get_conn(file->ex_id, EX_ELEM_BLOCK, elem_block, NULL, NULL, elem_faces);
// Subtract 1 from each element face.
for (int j = 0; j < elem_face_size; ++j)
elem_faces[j] -= 1;
// Create the element block.
block = polyhedral_fe_block_new(num_elem, num_elem_faces, elem_faces);
}
else if (elem_type != FE_INVALID)
{
// Get the element's nodal mapping.
int* node_conn = polymec_malloc(sizeof(int) * num_elem * num_nodes_per_elem);
ex_get_conn(file->ex_id, EX_ELEM_BLOCK, elem_block, node_conn, NULL, NULL);
// Subtract 1 from each element node.
for (int j = 0; j < num_elem * num_nodes_per_elem; ++j)
node_conn[j] -= 1;
// Build the element block.
block = fe_block_new(num_elem, elem_type, num_nodes_per_elem, node_conn);
}
else
{
fe_mesh_free(mesh);
ex_close(file->ex_id);
polymec_error("Block %d contains an invalid (3D) element type.", elem_block);
}
// Fish out the element block name if it has one, or make a default.
ex_get_name(file->ex_id, EX_ELEM_BLOCK, elem_block, block_name);
if (strlen(block_name) == 0)
sprintf(block_name, "block_%d", elem_block);
// Add the element block to the mesh.
fe_mesh_add_block(mesh, block_name, block);
}
// Fetch node positions and compute geometry.
real_t x[file->num_nodes], y[file->num_nodes], z[file->num_nodes];
ex_get_coord(file->ex_id, x, y, z);
point_t* X = fe_mesh_node_positions(mesh);
for (int n = 0; n < file->num_nodes; ++n)
{
X[n].x = x[n];
X[n].y = y[n];
X[n].z = z[n];
}
// Fetch sets of entities.
for (int i = 1; i <= file->num_elem_sets; ++i)
fetch_set(file, EX_ELEM_SET, i, mesh, fe_mesh_create_element_set);
for (int i = 1; i <= file->num_face_sets; ++i)
fetch_set(file, EX_FACE_SET, i, mesh, fe_mesh_create_face_set);
for (int i = 1; i <= file->num_edge_sets; ++i)
fetch_set(file, EX_EDGE_SET, i, mesh, fe_mesh_create_edge_set);
for (int i = 1; i <= file->num_node_sets; ++i)
fetch_set(file, EX_NODE_SET, i, mesh, fe_mesh_create_node_set);
for (int i = 1; i <= file->num_side_sets; ++i)
fetch_set(file, EX_SIDE_SET, i, mesh, fe_mesh_create_side_set);
return mesh;
}
