From: Paul RASCLE <paul.rascle@edf.fr>
Date: Wed, 10 Oct 2018 11:51:29 +0000 (+0200)
Subject: Merge branch 'master' into pre/medCompatibility
X-Git-Tag: V9_2_0a2~12
X-Git-Url: http://git.salome-platform.org/gitweb/?p=modules%2Fsmesh.git;a=commitdiff_plain;h=a63fc78c25199b018fae4f5b182e6a348be0abf2;hp=f2614ea1d552edc74c317ba7ff2840bcd33d92f2

Merge branch 'master' into pre/medCompatibility
---

diff --git a/idl/SMESH_Mesh.idl b/idl/SMESH_Mesh.idl
index 46f4a40b7..9daba34f4 100644
--- a/idl/SMESH_Mesh.idl
+++ b/idl/SMESH_Mesh.idl
@@ -622,10 +622,13 @@ module SMESH
      *                 the groups Group_On_All_Nodes, Group_On_All_Faces, ... ;
      *                 the typical use is auto_groups=false.
      * - overwrite : boolean parameter for overwriting/not overwriting the file, if it exists
-     * - minor : define the minor version of MED file format.
+     * - version : define the version of MED file format, coded with major and minor digits (release digit not used)
+     *           for instance med 3.2.1 is coded 3*10+2 = 32, med 4.0.0 is coded 4*10+0 = 40.
+     *           The rules of compatibility to write a mesh in an older version than the current version
+     *           depend on the current version. For instance, with med 4.0 it is possible to write/append
+     *           med files in 4.0.0 (default format) or 3.2.1 or 3.3.1 formats.
      *           The minor must be between 0 and the current minor version of MED file library.
-     *           If minor is equal to -1, the minor version is not changed (default).
-     *           The major version cannot be changed.
+     *           If version is equal to -1, the version is not changed (default).
      * - autoDimension : if @c true, a space dimension of a MED mesh can be either
      *         - 1D if all mesh nodes lie on OX coordinate axis, or
      *         - 2D if all mesh nodes lie on XOY coordinate plane, or
@@ -634,7 +637,7 @@ module SMESH
      */
     void ExportMED( in string      fileName, 
 		    in boolean     auto_groups, 
-		    in long        minor,
+		    in long        version,
 		    in boolean     overwrite,
 		    in boolean     autoDimension) raises (SALOME::SALOME_Exception);
 
@@ -644,10 +647,13 @@ module SMESH
      * - meshPart : a part of mesh to store
      * - fileName : name of the MED file
      * - overwrite : boolean parameter for overwriting/not overwriting the file, if it exists
-     * - minor : define the minor version (y, where version is x.y.z) of MED file format.
+     * - version : define the version of MED file format, coded with major and minor digits (release digit not used)
+     *           for instance med 3.2.1 is coded 3*10+2 = 32, med 4.0.0 is coded 4*10+0 = 40.
+     *           The rules of compatibility to write a mesh in an older version than the current version
+     *           depend on the current version. For instance, with med 4.0 it is possible to write/append
+     *           med files in 4.0.0 (default format) or 3.2.1 or 3.3.1 formats.
      *           The minor must be between 0 and the current minor version of MED file library.
-     *           If minor is equal to -1, the minor version is not changed (default).
-     *           The major version (x, where version is x.y.z) cannot be changed.
+     *           If version is equal to -1, the version is not changed (default).
      * - autoDimension : if @c True, a space dimension for export is defined by mesh 
      *                 configuration; for example a planar mesh lying on XOY plane
      *                 will be exported as a mesh in 2D space. 
@@ -663,7 +669,7 @@ module SMESH
     void ExportPartToMED( in SMESH_IDSource     meshPart,
                           in string             fileName,
                           in boolean            auto_groups,
-                          in long               minor,
+                          in long               version,
                           in boolean            overwrite,
                           in boolean            autoDimension,
                           in GEOM::ListOfFields fields,
@@ -680,7 +686,13 @@ module SMESH
      * Return string representation of a MED file version comprising nbDigits
      */
     string GetVersionString(in long minor, in short nbDigits);
-
+    
+    /*!
+     *  Return the list of med versions compatibles for write/append,
+     *  encoded in 10*major+minor (for instance, code for med 3.2.1 is 32)
+     */
+    long_array GetMEDVersionsCompatibleForAppend();
+    
     /*!
      * Export Mesh to different Formats
      * (UNV supported version is I-DEAS 10)
diff --git a/src/DriverMED/DriverMED_W_SMESHDS_Mesh.cxx b/src/DriverMED/DriverMED_W_SMESHDS_Mesh.cxx
index a1902daac..63c69c992 100644
--- a/src/DriverMED/DriverMED_W_SMESHDS_Mesh.cxx
+++ b/src/DriverMED/DriverMED_W_SMESHDS_Mesh.cxx
@@ -61,12 +61,13 @@ DriverMED_W_SMESHDS_Mesh::DriverMED_W_SMESHDS_Mesh():
   myDoGroupOfBalls(false),
   myAutoDimension(false),
   myAddODOnVertices(false),
-  myDoAllInGroups(false)
+  myDoAllInGroups(false),
+  myVersion(-1)
 {}
 
-void DriverMED_W_SMESHDS_Mesh::SetFile(const std::string& theFileName, int theMinor)
+void DriverMED_W_SMESHDS_Mesh::SetFile(const std::string& theFileName, int theVersion)
 {
-  myMinor = theMinor;
+  myVersion = theVersion;
   Driver_SMESHDS_Mesh::SetFile(theFileName);
 }
 
@@ -74,7 +75,7 @@ void DriverMED_W_SMESHDS_Mesh::SetFile(const std::string& theFileName, int theMi
  * MED version is either the latest available, or with an inferior minor,
  * to ensure backward compatibility on writing med files.
  */
-string DriverMED_W_SMESHDS_Mesh::GetVersionString(int theVersion, int theNbDigits)
+string DriverMED_W_SMESHDS_Mesh::GetVersionString(int theMinor, int theNbDigits)
 {
   TInt majeur, mineur, release;
   majeur=MED_MAJOR_NUM;
@@ -82,12 +83,12 @@ string DriverMED_W_SMESHDS_Mesh::GetVersionString(int theVersion, int theNbDigit
   release=MED_RELEASE_NUM;
   TInt imposedMineur = mineur;
 
-  if (theVersion < 0)
+  if (theMinor < 0)
     imposedMineur = mineur;
-  else if (theVersion > MED_MINOR_NUM)
+  else if (theMinor > MED_MINOR_NUM)
     imposedMineur = mineur;
   else
-    imposedMineur = theVersion;
+    imposedMineur = theMinor;
 
   ostringstream name;
   if ( theNbDigits > 0 )
@@ -457,7 +458,7 @@ Driver_Mesh::Status DriverMED_W_SMESHDS_Mesh::Perform()
       }
     }
 
-    MED::PWrapper myMed = CrWrapperW(myFile, myMinor);
+    MED::PWrapper myMed = CrWrapperW(myFile, myVersion);
     PMeshInfo aMeshInfo = myMed->CrMeshInfo(aMeshDimension,aSpaceDimension,aMeshName);
     //MESSAGE("Add - aMeshName : "<<aMeshName<<"; "<<aMeshInfo->GetName());
     myMed->SetMeshInfo(aMeshInfo);
diff --git a/src/DriverMED/DriverMED_W_SMESHDS_Mesh.h b/src/DriverMED/DriverMED_W_SMESHDS_Mesh.h
index 60261dd62..2b04c05f9 100644
--- a/src/DriverMED/DriverMED_W_SMESHDS_Mesh.h
+++ b/src/DriverMED/DriverMED_W_SMESHDS_Mesh.h
@@ -48,10 +48,10 @@ class MESHDRIVERMED_EXPORT DriverMED_W_SMESHDS_Mesh: public Driver_SMESHDS_Mesh
 
   DriverMED_W_SMESHDS_Mesh();
 
-  void SetFile(const std::string& theFileName, int theMinor=-1);
+  void SetFile(const std::string& theFileName, int theVersion=-1);
   void SetAutoDimension(bool toFindOutDimension) { myAutoDimension = toFindOutDimension; }
 
-  static std::string GetVersionString(int theVersion, int theNbDigits=2);
+  static std::string GetVersionString(int theMinor, int theNbDigits=2);
 
   void AddGroupOfNodes();
   void AddGroupOfEdges();
@@ -89,7 +89,7 @@ class MESHDRIVERMED_EXPORT DriverMED_W_SMESHDS_Mesh: public Driver_SMESHDS_Mesh
   bool myAutoDimension;
   bool myAddODOnVertices;
   bool myDoAllInGroups;
-  int myMinor;
+  int myVersion;
 };
 
 #endif
diff --git a/src/MEDWrapper/MED_Factory.cxx b/src/MEDWrapper/MED_Factory.cxx
index dbe60c051..37c8d4f13 100644
--- a/src/MEDWrapper/MED_Factory.cxx
+++ b/src/MEDWrapper/MED_Factory.cxx
@@ -27,6 +27,7 @@
 #include <stdio.h>
 #include <errno.h>
 #include <sstream>
+#include <fstream>
 
 #include <med.h>
 extern "C"
@@ -41,6 +42,49 @@ extern "C"
 #include <windows.h>
 #endif
 
+// -------------------------------------------------------------------------------------------------------------------
+// --- MED file compatibility: write using a lower major version implies append on an empty file of the target version
+
+#define MED_MAJOR_EXPECTED 4
+#define MED_MINOR_EXPECTED 0
+#if MED_MAJOR_NUM != MED_MAJOR_EXPECTED
+  #error "MED major version does not correspond to the expected version, fix the minor and major compatibility values in CheckCompatibility method (MED_VERSIONS_APPEND_COMPATIBLE) and set the correct expected version"
+#endif
+#if MED_MINOR_NUM != MED_MINOR_EXPECTED
+  #error "MED minor version does not correspond to the expected version, fix the minor and major compatibility values in CheckCompatibility method (MED_VERSIONS_APPEND_COMPATIBLE) and set the correct expected version"
+#endif
+#define MED_VERSIONS_APPEND_COMPATIBLE {40, 32, 33} // --- 10*major + minor (the 3rd digit, release, is not used here,
+                                                    //                       med uses always the latest available)
+                                                    // --- The first in the list should be the default: current version
+// --- empty med file content for the different MED versions with a different major.
+//     ==> correct accordingly CreateEmptyMEDFile method below!
+#define EMPTY_FILE_32 {0x89,0x48,0x44,0x46,0xd,0xa,0x1a,0xa,0x0,0x0,0x0,0x0,0x0,0x8,0x8,0x0,0x4,0x0,0x10,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xe8,0x7,0x0,0x0,0x0,0x0,0x0,0x0,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x60,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x88,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xa8,0x2,0x0,0x0,0x0,0x0,0x0,0x0,0x1,0x0,0x1,0x0,0x1,0x0,0x0,0x0,0x18,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x11,0x0,0x10,0x0,0x0,0x0,0x0,0x0,0x88,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xa8,0x2,0x0,0x0,0x0,0x0,0x0,0x0,0x54,0x52,0x45,0x45,0x0,0x0,0x1,0x0,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xe0,0x5,0x0,0x0,0x0,0x0,0x0,0x0,0x8,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x48,0x45,0x41,0x50,0x0,0x0,0x0,0x0,0x58,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x18,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xc8,0x2,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x49,0x4e,0x46,0x4f,0x53,0x5f,0x47,0x45,0x4e,0x45,0x52,0x41,0x4c,0x45,0x53,0x0,0x1,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x40,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1,0x0,0x5,0x0,0x1,0x0,0x0,0x0,0x18,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x10,0x0,0x10,0x0,0x0,0x0,0x0,0x0,0x28,0x7,0x0,0x0,0x0,0x0,0x0,0x0,0xc0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x54,0x52,0x45,0x45,0x0,0x0,0x0,0x0,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xe0,0x5,0x0,0x0,0x0,0x0,0x0,0x0,0x8,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x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+#define EMPTY_FILE_33 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+/* --- bytes hexa representation of MED file built in Python
+f= open('vide_321.med', 'rb')
+data=f.read()
+ba=bytearray(data)
+a=""
+for i in ba:
+  a+=hex(i)
+  a+=','
+print a
+*/
+
+//! internal use: fileName and version must be checked before call
+bool CreateEmptyMEDFile(const std::string& fileName, int version)
+{
+  MESSAGE("create an empty med file of the right version, for append " << version);
+  static const unsigned char empty_32[] = EMPTY_FILE_32;
+  static const unsigned char empty_33[] = EMPTY_FILE_33;
+  std::ofstream ofs(fileName);
+  if (version == 32)
+    ofs.write(reinterpret_cast<const char *>(empty_32),sizeof(empty_32));
+  else if (version == 33)
+    ofs.write(reinterpret_cast<const char *>(empty_33),sizeof(empty_33));
+  return true;
+}
+// -------------------------------------------------------------------------------------------------------------------
 
 namespace MED
 {
@@ -61,25 +105,51 @@ namespace MED
 #endif
   }
 
+  /*!
+   *  Return the list of med versions compatibles for write/append,
+   *  encoded in 10*major+minor (for instance, code for med 3.2.1 is 32)
+   */
+  std::vector<int> GetMEDVersionsAppendCompatible()
+  {
+    int mvok[] = MED_VERSIONS_APPEND_COMPATIBLE;
+    std::vector<int> MEDVersionsOK(mvok, mvok + sizeof(mvok)/sizeof(int));
+    return MEDVersionsOK;
+  }
+
+  /*!
+   *  \brief: Check read or write(append) Compatibility of a med file
+   *  \param [in] : fileName - the file to read or to append to
+   *  \param [in] : isforAppend - when true, check if the med file version is OK to append a mesh,
+   *                              when false, check if the med file is readable.
+   */
   bool CheckCompatibility(const std::string& fileName, bool isForAppend)
   {
     bool ok = false;
+    int medVersionsOK[] = MED_VERSIONS_APPEND_COMPATIBLE;
     // check that file is accessible
     if ( exists(fileName) ) {
       // check HDF5 && MED compatibility
       med_bool hdfok, medok;
       med_err r0 = MEDfileCompatibility(fileName.c_str(), &hdfok, &medok);
-      //MESSAGE(r0 << " " << hdfok << " " << medok);
+      MESSAGE(r0 << " " << hdfok << " " << medok);
       if ( r0==0 && hdfok && medok ) {
         med_idt aFid = MEDfileOpen(fileName.c_str(), MED_ACC_RDONLY);
         if (aFid >= 0) {
           med_int major, minor, release;
           med_err ret = MEDfileNumVersionRd(aFid, &major, &minor, &release);
-          //MESSAGE(ret << " " << major << "." << minor << "." << release);
+          MESSAGE(ret << " " << major << "." << minor << "." << release);
           if (ret >= 0) {
             bool isReadOnly = !isForAppend;
-            if ( isReadOnly  || ((major == MED_MAJOR_NUM) && (minor == MED_MINOR_NUM)))
+            if (isReadOnly)
               ok = true;
+            else {
+              int medVersion = 10*major + minor;
+              for (int ii=0; ii < sizeof(medVersionsOK)/sizeof(int); ii++)
+                if (medVersionsOK[ii] == medVersion) {
+                  ok =true;
+                  break;
+                }
+            }
           }
         }
         MEDfileClose(aFid);
@@ -127,10 +197,43 @@ namespace MED
     return new MED::TWrapper(fileName);
   }
 
-  PWrapper CrWrapperW(const std::string& fileName, int theMinor)
+  PWrapper CrWrapperW(const std::string& fileName, int theVersion)
   {
+    bool isCreated = false;
     if (!CheckCompatibility(fileName, true))
-      remove(fileName.c_str());
-    return new MED::TWrapper(fileName, theMinor);
+      {
+        remove(fileName.c_str());
+        isCreated = true;
+      }
+    int minor = -1;
+    if (isCreated)
+      {
+        med_int wantedMajor = MED_MAJOR_NUM;
+        med_int wantedMinor = MED_MINOR_NUM;
+        if (theVersion > 0)
+          {
+            wantedMajor = theVersion/10;
+            wantedMinor = theVersion%10;
+          }
+        if (wantedMajor == MED_MAJOR_NUM) // the med file will be actually created
+          {
+            if (wantedMinor < MED_MINOR_NUM)
+              minor = wantedMinor;
+          }
+        else                              // an empty existing med file of the right version will be used for append
+          {
+            int medVersionsOK[] = MED_VERSIONS_APPEND_COMPATIBLE;
+            bool isVersionOK = false;
+            for (int ii=0; ii < sizeof(medVersionsOK)/sizeof(int); ii++)
+              if (medVersionsOK[ii] == theVersion)
+                {
+                  isVersionOK =true;
+                  break;
+                }
+            if (isVersionOK)              // copy an empty existing med file of the right version, for append
+              CreateEmptyMEDFile(fileName, theVersion);
+          }
+      }
+    return new MED::TWrapper(fileName, minor);
   }
 }
diff --git a/src/MEDWrapper/MED_Factory.hxx b/src/MEDWrapper/MED_Factory.hxx
index fe5e0032c..84087d138 100644
--- a/src/MEDWrapper/MED_Factory.hxx
+++ b/src/MEDWrapper/MED_Factory.hxx
@@ -27,6 +27,7 @@
 #include "MED_Wrapper.hxx"
 
 #include <string>
+#include <vector>
 
 namespace MED
 {
@@ -39,11 +40,14 @@ namespace MED
   MEDWRAPPER_EXPORT
   bool CheckCompatibility( const std::string& , bool isForAppend=false);
 
+  MEDWRAPPER_EXPORT
+  std::vector<int> GetMEDVersionsAppendCompatible();
+
   MEDWRAPPER_EXPORT
   PWrapper CrWrapperR( const std::string& );
 
   MEDWRAPPER_EXPORT
-  PWrapper CrWrapperW( const std::string&, int theMinor=-1 );
+  PWrapper CrWrapperW( const std::string&, int theVersion=-1 );
 }
 
 #endif // MED_Factory_HeaderFile
diff --git a/src/MEDWrapper/MED_Wrapper.hxx b/src/MEDWrapper/MED_Wrapper.hxx
index 05b0496c2..159d45714 100644
--- a/src/MEDWrapper/MED_Wrapper.hxx
+++ b/src/MEDWrapper/MED_Wrapper.hxx
@@ -52,7 +52,7 @@ namespace MED
     TWrapper& operator=(const TWrapper&);
 
   public:
-    TWrapper(const std::string& theFileName, TInt theMinor=-1);
+    TWrapper(const std::string& theFileName, TInt theVersion=-1);
 
     virtual
     ~TWrapper();
diff --git a/src/SMESH/SMESH_Mesh.cxx b/src/SMESH/SMESH_Mesh.cxx
index 226800af2..4e7368ab6 100644
--- a/src/SMESH/SMESH_Mesh.cxx
+++ b/src/SMESH/SMESH_Mesh.cxx
@@ -1422,18 +1422,18 @@ bool SMESH_Mesh::HasDuplicatedGroupNamesMED()
 void SMESH_Mesh::ExportMED(const char *        file, 
                            const char*         theMeshName, 
                            bool                theAutoGroups,
-                           int                 theMinor,
+                           int                 theVersion,
                            const SMESHDS_Mesh* meshPart,
                            bool                theAutoDimension,
                            bool                theAddODOnVertices,
                            bool                theAllElemsToGroup)
   throw(SALOME_Exception)
 {
-  //MESSAGE("MED_VERSION:"<< theVersion);
+  MESSAGE("MED_VERSION:"<< theVersion);
   SMESH_TRY;
 
   DriverMED_W_SMESHDS_Mesh myWriter;
-  myWriter.SetFile         ( file , theMinor);
+  myWriter.SetFile         ( file , theVersion);
   myWriter.SetMesh         ( meshPart ? (SMESHDS_Mesh*) meshPart : _myMeshDS   );
   myWriter.SetAutoDimension( theAutoDimension );
   myWriter.AddODOnVertices ( theAddODOnVertices );
diff --git a/src/SMESH/SMESH_Mesh.hxx b/src/SMESH/SMESH_Mesh.hxx
index dbe14fed8..59ad490b1 100644
--- a/src/SMESH/SMESH_Mesh.hxx
+++ b/src/SMESH/SMESH_Mesh.hxx
@@ -254,7 +254,7 @@ class SMESH_EXPORT SMESH_Mesh
   void ExportMED(const char *        theFile, 
                  const char*         theMeshName = NULL, 
                  bool                theAutoGroups = true, 
-                 int                 TheMinor = -1,
+                 int                 theVersion = -1,
                  const SMESHDS_Mesh* theMeshPart = 0,
                  bool                theAutoDimension = false,
                  bool                theAddODOnVertices = false,
diff --git a/src/SMESHGUI/SMESHGUI.cxx b/src/SMESHGUI/SMESHGUI.cxx
index 1225963f6..99ae22dd2 100644
--- a/src/SMESHGUI/SMESHGUI.cxx
+++ b/src/SMESHGUI/SMESHGUI.cxx
@@ -655,7 +655,7 @@ namespace
     // Get parameters of export operation
 
     QString aFilename;
-    int aFormat =-1;         // for MED minor versions
+    int aFormat =-1;         // for MED version used for write
     bool isOkToWrite = true; // to check MED file version compatibility before adding a mesh in an existing file
 
     // Init the parameters with the default values
@@ -744,38 +744,39 @@ namespace
     }
     else if ( isMED || isSAUV ) // Export to MED or SAUV
     {
+      int defaultVersion = 0;
       QMap<QString, int> aFilterMap;
       if ( isMED ) {
         //filters << QObject::tr( "MED_FILES_FILTER" ) + " (*.med)";
-        QString vmed (aMesh->GetVersionString(-1, 2));
+        //QString vmed (aMesh->GetVersionString(-1, 2));
         //MESSAGE("MED version: " << vmed.toStdString());
-        int minor = vmed.split(".").last().toInt();
-        //MESSAGE("MED version minor: "<< minor);
-        //minor +=3;                  // TODO remove: test multiple minor
-        aFilterMap.insert( QObject::tr( "MED_VX_FILES_FILTER" ).arg( vmed ) + " (*.med)", minor );
-        for (int ii=0; ii<minor; ii++)
+        SMESH::long_array_var mvok = aMesh->GetMEDVersionsCompatibleForAppend();
+        for ( int i = 0; i < mvok->length(); ++i )  // i=0 must correspond to the current version to set the default filter on it
           {
-            QString vs = aMesh->GetVersionString(ii, 2);
-            //std::ostringstream vss; // TODO remove: test multiple minor
-            //vss << "4.";            // TODO remove: test multiple minor
-            //vss << ii;              // TODO remove: test multiple minor
-            //vs = vss.str().c_str(); // TODO remove: test multiple minor
-            //MESSAGE("MED version: " << vs.toStdString());
-            aFilterMap.insert( QObject::tr( "MED_VX_FILES_FILTER" ).arg( vs ) + " (*.med)",  ii);
+            int versionInt = mvok[i];
+            if (i == 0)
+              defaultVersion = versionInt;
+            std::ostringstream vss;
+            vss << versionInt/10;
+            vss << ".";
+            vss << versionInt%10;
+            QString vs = vss.str().c_str();
+            MESSAGE("MED version: " << vs.toStdString());
+            aFilterMap.insert( QObject::tr( "MED_VX_FILES_FILTER" ).arg( vs ) + " (*.med)",  versionInt);
           }
       }
       else { // isSAUV
         aFilterMap.insert("All files (*)", -1 );
-        aFilterMap.insert("SAUV files (*.sauv)", -1 );
+        aFilterMap.insert("SAUV files (*.sauv)", defaultVersion ); // 0 = default filter (defaultVersion)
         aFilterMap.insert("SAUV files (*.sauve)", -1 );
       }
-
+      MESSAGE("default version="<< defaultVersion);
       QStringList filters;
-      QString aDefaultFilter;
       QMap<QString, int>::const_iterator it = aFilterMap.begin();
+      QString aDefaultFilter = it.key();
       for ( ; it != aFilterMap.end(); ++it ) {
         filters.push_back( it.key() );
-        if (it.key() == 0)
+        if (it.value() == defaultVersion) // explicit default for MED = current MED version
           aDefaultFilter = it.key();
       }
       QStringList checkBoxes;
@@ -790,6 +791,7 @@ namespace
         new SalomeApp_CheckFileDlg ( SMESHGUI::desktop(), false, checkBoxes, true, true, wdgList );
       fd->setWindowTitle( aTitle );
       fd->setNameFilters( filters );
+      fd->selectNameFilter( aDefaultFilter );
       fd->SetChecked( toCreateGroups, 0 );
       fd->SetChecked( toFindOutDim,   1 );
       if ( !anInitialPath.isEmpty() )
@@ -820,13 +822,13 @@ namespace
           break;
         }
         aFormat = aFilterMap[fd->selectedNameFilter()];
-        MESSAGE("selected minor: " << aFormat << " file: " << aFilename.toUtf8().constData());
+        MESSAGE("selected version: " << aFormat << " file: " << aFilename.toUtf8().constData());
         toOverwrite = fv->isOverwrite(aFilename);
         MESSAGE("toOverwrite:" << toOverwrite);
         is_ok = true;
         if ( !aFilename.isEmpty() ) {
           if( !toOverwrite ) {
-            // can't append to an existing using other format
+            // append is only possible if the existing file format is compatible
             bool isVersionOk = SMESHGUI::GetSMESHGen()->CheckWriteCompatibility( aFilename.toUtf8().constData() );
             MESSAGE("Append check, isVersionOk:" << isVersionOk);
             if ( !isVersionOk ) {
diff --git a/src/SMESH_I/SMESH_Mesh_i.cxx b/src/SMESH_I/SMESH_Mesh_i.cxx
index 128dbed1c..26fcc1e97 100644
--- a/src/SMESH_I/SMESH_Mesh_i.cxx
+++ b/src/SMESH_I/SMESH_Mesh_i.cxx
@@ -468,6 +468,23 @@ char* SMESH_Mesh_i::GetVersionString(CORBA::Long minor, CORBA::Short nbDigits)
   return CORBA::string_dup( ver.c_str() );
 }
 
+//================================================================================
+/*!
+ *  Return the list of med versions compatibles for write/append,
+ *  encoded in 10*major+minor (for instance, code for med 3.2.1 is 32)
+ */
+//================================================================================
+SMESH::long_array* SMESH_Mesh_i::GetMEDVersionsCompatibleForAppend()
+{
+  SMESH::long_array_var aResult = new SMESH::long_array();
+  std::vector<int> mvok = MED::GetMEDVersionsAppendCompatible();
+  long nbver = mvok.size();
+  aResult->length( nbver );
+  for ( int i = 0; i < nbver; i++ )
+    aResult[i] = mvok[i];
+  return aResult._retn();
+}
+
 //=============================================================================
 /*!
  *  ImportUNVFile
@@ -3062,7 +3079,7 @@ string SMESH_Mesh_i::prepareMeshNameAndGroups(const char*    file,
 
 void SMESH_Mesh_i::ExportMED(const char*        file,
                              CORBA::Boolean     auto_groups,
-                             CORBA::Long        minor,
+                             CORBA::Long        version,
                              CORBA::Boolean     overwrite,
                              CORBA::Boolean     autoDimension)
   throw(SALOME::SALOME_Exception)
@@ -3073,12 +3090,12 @@ void SMESH_Mesh_i::ExportMED(const char*        file,
     _preMeshInfo->FullLoadFromFile();
 
   string aMeshName = prepareMeshNameAndGroups(file, overwrite);
-  _impl->ExportMED( file, aMeshName.c_str(), auto_groups, minor, 0, autoDimension );
+  _impl->ExportMED( file, aMeshName.c_str(), auto_groups, version, 0, autoDimension );
 
   TPythonDump() << SMESH::SMESH_Mesh_var(_this()) << ".ExportMED( r'"
                 << file << "', "
                 << "auto_groups=" <<auto_groups << ", "
-                << "minor=" << minor <<  ", "
+                << "minor=" << version <<  ", "
                 << "overwrite=" << overwrite << ", "
                 << "meshPart=None, "
                 << "autoDimension=" << autoDimension << " )";
@@ -3191,14 +3208,14 @@ void SMESH_Mesh_i::ExportSTL (const char *file, const bool isascii)
 void SMESH_Mesh_i::ExportPartToMED(SMESH::SMESH_IDSource_ptr meshPart,
                                    const char*               file,
                                    CORBA::Boolean            auto_groups,
-                                   CORBA::Long               minor,
+                                   CORBA::Long               version,
                                    CORBA::Boolean            overwrite,
                                    CORBA::Boolean            autoDimension,
                                    const GEOM::ListOfFields& fields,
                                    const char*               geomAssocFields)
   throw (SALOME::SALOME_Exception)
 {
-  //MESSAGE("MED minor version: "<< minor);
+  MESSAGE("MED version: "<< version);
   SMESH_TRY;
   if ( _preMeshInfo )
     _preMeshInfo->FullLoadFromFile();
@@ -3245,7 +3262,7 @@ void SMESH_Mesh_i::ExportPartToMED(SMESH::SMESH_IDSource_ptr meshPart,
        SMESH::DownCast< SMESH_Mesh_i* >( meshPart ))
   {
     aMeshName = prepareMeshNameAndGroups(file, overwrite);
-    _impl->ExportMED( file, aMeshName.c_str(), auto_groups, minor,
+    _impl->ExportMED( file, aMeshName.c_str(), auto_groups, version,
                       0, autoDimension, /*addODOnVertices=*/have0dField);
     meshDS = _impl->GetMeshDS();
   }
@@ -3263,7 +3280,7 @@ void SMESH_Mesh_i::ExportPartToMED(SMESH::SMESH_IDSource_ptr meshPart,
     }
 
     SMESH_MeshPartDS* partDS = new SMESH_MeshPartDS( meshPart );
-    _impl->ExportMED( file, aMeshName.c_str(), auto_groups, minor,
+    _impl->ExportMED( file, aMeshName.c_str(), auto_groups, version,
                       partDS, autoDimension, /*addODOnVertices=*/have0dField);
     meshDS = tmpDSDeleter._obj = partDS;
   }
@@ -3292,7 +3309,7 @@ void SMESH_Mesh_i::ExportPartToMED(SMESH::SMESH_IDSource_ptr meshPart,
                 << meshPart << ", r'"
                 << file << "', "
                 << auto_groups << ", "
-                << minor << ", "
+                << version << ", "
                 << overwrite << ", "
                 << autoDimension << ", "
                 << goList << ", '"
diff --git a/src/SMESH_I/SMESH_Mesh_i.hxx b/src/SMESH_I/SMESH_Mesh_i.hxx
index 7e612be13..41bbce48b 100644
--- a/src/SMESH_I/SMESH_Mesh_i.hxx
+++ b/src/SMESH_I/SMESH_Mesh_i.hxx
@@ -225,14 +225,21 @@ public:
    *  Consider maximum group name length stored in MED file.
    */
   CORBA::Boolean HasDuplicatedGroupNamesMED();
+
   /*!
    * Return string representation of a MED file version comprising nbDigits
    */
   char* GetVersionString(CORBA::Long minor, CORBA::Short nbDigits);
 
+  /*!
+   *  Return the list of med versions compatibles for write/append,
+   *  encoded in 10*major+minor (for instance, code for med 3.2.1 is 32)
+   */
+  SMESH::long_array* GetMEDVersionsCompatibleForAppend();
+
   void ExportMED( const char*        file,
                   CORBA::Boolean     auto_groups,
-                  CORBA::Long        minor,
+                  CORBA::Long        version,
                   CORBA::Boolean     overwrite,
                   CORBA::Boolean     autoDimension = true) throw (SALOME::SALOME_Exception);
 
@@ -252,7 +259,7 @@ public:
   void ExportPartToMED(SMESH::SMESH_IDSource_ptr meshPart,
                        const char*               file,
                        CORBA::Boolean            auto_groups,
-                       CORBA::Long               minor,
+                       CORBA::Long               version,
                        CORBA::Boolean            overwrite,
                        CORBA::Boolean            autoDim,
                        const GEOM::ListOfFields& fields,