0022638: [CEA 1210] Wrong import of an UNV file

Support reading a mesh in 2D space

src/DriverUNV/UNV2411_Structure.cxx

@@ -21,7 +21,7 @@
 //
 
 #include <fstream>
-#include <stdio.h>      
+#include <cstdio>
 
 #include "UNV2411_Structure.hxx"
 #include "UNV_Utilities.hxx"
@@ -36,7 +36,9 @@ UNV2411::TRecord::TRecord():
   exp_coord_sys_num(1),
   disp_coord_sys_num(1),
   color(11)//(0) -  0019936: EDF 794 SMESH : Export UNV : Node color and group id
-{}
+{
+  coord[1] = coord[2] = 0.0; // prepare to e.g. 2D mesh
+}
 
 void UNV2411::Read(std::ifstream& in_stream, TDataSet& theDataSet)
 {
@@ -54,7 +56,40 @@ void UNV2411::Read(std::ifstream& in_stream, TDataSet& theDataSet)
    * always 3 coordinates in the UNV file, no matter
    * which dimensionality libMesh is in
    */
+  int dim = 3;
   std::string num_buf;
+
+  // Issue 22638. Find out space dimension to read a 2D mesh from a file
+  // generated by SIMAIL from Simulog
+  if ( !in_stream.eof() )
+  {
+    int where  = in_stream.tellg();
+
+    TRecord aRec;
+    in_stream >> aRec.label ;
+    if ( aRec.label == -1 ) return; // dataset end 
+
+    dim = 0;
+    num_buf = read_line( in_stream );
+    for ( size_t i = 0; i < num_buf.size(); )
+    {
+      // skip spaces
+      while ( i < num_buf.size() && num_buf[i] == ' ' )
+        ++i;
+
+      dim += ( i < num_buf.size() );
+
+      // skip non-spaces
+      while ( i < num_buf.size() && num_buf[i] != ' ' )
+        ++i;
+    }
+    if ( dim == 0 )
+      return;
+
+    in_stream.seekg( where, in_stream.beg );
+  }
+
+  // read the rest records
   while ( !in_stream.eof() )
   {
     TRecord aRec;
@@ -72,7 +107,7 @@ void UNV2411::Read(std::ifstream& in_stream, TDataSet& theDataSet)
      * take care of the
      * floating-point data
      */
-    for(int d = 0; d < 3; d++){
+    for(int d = 0; d < dim; d++){
       in_stream>>num_buf;
       aRec.coord[d] = D_to_e(num_buf);
     }