MED write/append with a lower major version of MED file format: third step

diff --git a/src/MEDWrapper/MED_Factory.cxx b/src/MEDWrapper/MED_Factory.cxx
index 2ffcfe69fe4694f8e34d42c73c230dc881d722f3..e03f7d66bc86eb7172af059d1f7b0432e4a00412 100644 (file)
--- 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 +42,9 @@ 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
@@ -52,6 +56,39 @@ extern "C"
 #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 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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)
+//l=[]
+//for c in ba:
+//  l.append(hex(c))
+//a=""
+//for i in l:
+//  a+=i
+//  a+=','
+//print a
+//# -----------------------------
+
+//! internal use: fileName and version must be checked before call
+bool CreateEmptyMEDFile(const std::string& fileName, int version)
+{
+  MESSAGE("copy an empty existing 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
 {
@@ -187,7 +224,7 @@ namespace MED
             if (wantedMinor < MED_MINOR_NUM)
               minor = wantedMinor;
           }
-        else                            // an empty existing med file of the right version will be used for append
+        else                              // an empty existing med file of the right version will be used for append
           {
             int medVersionsOK[] = MED_VERSIONS_APPEND_COMPATIBLE;
             bool isVersionOK = false;
@@ -197,10 +234,8 @@ namespace MED
                   isVersionOK =true;
                   break;
                 }
-            if (isVersionOK)           // copy an empty existing med file of the right version, for append
-              {
-                MESSAGE("copy an empty existing med file of the right version, for append" << theVersion);
-              }
+            if (isVersionOK)              // copy an empty existing med file of the right version, for append
+              CreateEmptyMEDFile(fileName, theVersion);
           }
       }
     return new MED::TWrapper(fileName, minor);