[NTOSKRNL:CC] Add CalculatePageCount Template

Added CalculatePageCount Template function to calculate total pagecount from file offset and length

NTOSKRNL/CC/ccinternal.hpp

@@ -144,3 +144,16 @@ private:
         }
     }
 };
+
+template<typename T>
+ULONG CalculatePageCount(T Length, LARGE_INTEGER FileOffset) {
+    constexpr ULONG PAGE_OFFSET = 0xFFF;  // 4095 (mask for the lower 12 bits)
+    constexpr ULONG PAGE_SHIFT = 12;      // Shift by 12 bits for 4KB pages
+
+    // Calculate the page count
+    ULONG pageCount = (Length >> PAGE_SHIFT) + 
+                      ((FileOffset.LowPart & PAGE_OFFSET) + 4095 + (Length & PAGE_OFFSET)) >> PAGE_SHIFT;
+
+    return pageCount;
+}
+