add part of class CFStorage

Common/cppcf/cfstream.cpp

@@ -0,0 +1,12 @@
+#include "cfstream.h"
+#include "cfexception.h"
+
+
+CFCPP::CFStream::CFStream(std::shared_ptr<CompoundFile> compFile, std::shared_ptr<IDirectoryEntry> dirEntry) :
+    CFItem(compFile)
+{
+    if (dirEntry == nullptr || dirEntry->getSid() < 0)
+        throw new CFException("Attempting to create a CFStorage using an unitialized directory");
+
+    this->dirEntry = dirEntry;
+}