arh2 file reader uses minor to backward compatible

AMDiS/src/io/Arh2Reader.h

@@ -24,7 +24,7 @@ namespace AMDiS { namespace io {
   namespace Arh2Reader
   {
     const uint8_t MAJOR = 2;
-    const uint8_t MINOR = 0;
+    const uint8_t MINOR = 1;
   
     /** 
      * \brief Read MeshStructure, refine the mesh and read dof values to sysVec by order.

AMDiS/src/io/Arh2Writer.h

@@ -16,7 +16,7 @@ namespace AMDiS { namespace io {
   namespace Arh2Writer
   {    
     const uint8_t MAJOR = 2;
-    const uint8_t MINOR = 0; 
+    const uint8_t MINOR = 1; 
     
     /**
       * \brief write the meshstructure and the dof values of DOFVectors in sysVec

AMDiS/src/io/detail/Arh2Reader.cc

@@ -22,7 +22,7 @@ namespace AMDiS { namespace io {
     namespace detail
     {
       
-      void firstRead(ifstream& file)
+      uint8_t firstRead(ifstream& file)
       {
 	FUNCNAME("Arh2Reader::detail::firstRead");
 	
@@ -42,6 +42,7 @@ namespace AMDiS { namespace io {
 	TEST_EXIT(minor <= AMDiS::io::Arh2Reader::MINOR)
 	  ("Cannot read Arh2 format: Arh2Reader minor version is %i is smaller than the file minor version %i.\n", 
 	  AMDiS::io::Arh2Reader::MINOR, minor);
+        return minor;
       }
       
       void setDofValues(int macroElIndex, Mesh *mesh,
@@ -224,7 +225,7 @@ namespace AMDiS { namespace io {
 	uint32_t dim = 0, dow = 0;
 
 	// Read fixed header
-	firstRead(file);
+	uint8_t minor = firstRead(file);
       
 	file.read(reinterpret_cast<char*>(&headerLen), 4);
 	file.read(reinterpret_cast<char*>(&dow), 4);
@@ -232,7 +233,16 @@ namespace AMDiS { namespace io {
 	file.read(reinterpret_cast<char*>(&nFeSpaces), 4);
 	file.read(reinterpret_cast<char*>(&nValueVectors), 4);
 	file.read(reinterpret_cast<char*>(&nMacroElements), 4);
-	file.read(const_cast<char*>(cps.data()), 4);
+        switch(minor) {
+          case 0:
+            cps = "null";break;
+          case 1: 
+            file.read(const_cast<char*>(cps.data()), 4);
+            break;
+          default:
+            ERROR_EXIT("Should not happen.\n");
+            break;
+        }
 	
 #ifdef HAVE_COMPRESSION
 	TEST_EXIT(cps == "null" || cps == "zlib")

AMDiS/src/io/detail/Arh2Reader.h

@@ -21,8 +21,9 @@ namespace AMDiS { namespace io {
      * 1. the type of file is equal to "arh2".
      * 2. the major version of Arh2Reader is equal to the one in the file.
      * 3. the minor version of Arh2Reader is bigger than the one in the file.
+     * return: minor version
      */
-      void firstRead(std::ifstream& file);
+      uint8_t firstRead(std::ifstream& file);
       
       void setDofValues(int macroElIndex, Mesh *mesh,
 			     std::vector<std::vector<double> >& values, 
@@ -70,4 +71,4 @@ namespace AMDiS { namespace io {
   } // end namespace Arh2Reader
 } } // end namespace io, AMDiS
 
-#endif
\ No newline at end of file
+#endif