Added indexed array data type with variable and fixed group blocks

include/storage/io.hpp

@@ -61,6 +61,22 @@ class FileReader
         }
     }
 
+    std::size_t GetSize()
+    {
+        const boost::filesystem::ifstream::pos_type positon = input_stream.tellg();
+        input_stream.seekg(0, std::ios::end);
+        const boost::filesystem::ifstream::pos_type file_size = input_stream.tellg();
+
+        if (file_size == boost::filesystem::ifstream::pos_type(-1))
+        {
+            throw util::exception("File size for " + filepath.string() + " failed " + SOURCE_REF);
+        }
+
+        // restore the current position
+        input_stream.seekg(positon, std::ios::beg);
+        return file_size;
+    }
+
     /* Read count objects of type T into pointer dest */
     template <typename T> void ReadInto(T *dest, const std::size_t count)
     {

include/storage/shared_datatype.hpp

@@ -18,9 +18,7 @@ namespace storage
 // Added at the start and end of each block as sanity check
 const constexpr char CANARY[4] = {'O', 'S', 'R', 'M'};
 
-const constexpr char *block_id_to_name[] = {"NAME_OFFSETS",
-                                            "NAME_BLOCKS",
-                                            "NAME_CHAR_LIST",
+const constexpr char *block_id_to_name[] = {"NAME_CHAR_DATA",
                                             "NAME_ID_LIST",
                                             "VIA_NODE_LIST",
                                             "GRAPH_NODE_LIST",
@@ -64,9 +62,7 @@ struct DataLayout
 {
     enum BlockID
     {
-        NAME_OFFSETS = 0,
-        NAME_BLOCKS,
-        NAME_CHAR_LIST,
+        NAME_CHAR_DATA = 0,
         NAME_ID_LIST,
         VIA_NODE_LIST,
         GRAPH_NODE_LIST,