New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/storage/storage_helpers.hpp

@@ -0,0 +1,36 @@
+#pragma once
+
+#include "storage/diff_scheme/diffs_data_source.hpp"
+#include "storage/storage_defines.hpp"
+
+#include "platform/country_defines.hpp"
+#include "platform/country_file.hpp"
+
+#include "geometry/point2d.hpp"
+#include "geometry/rect2d.hpp"
+
+namespace storage
+{
+class CountryInfoGetter;
+class Storage;
+
+/// \returns true if |position| is covered by a downloaded mwms and false otherwise.
+/// \note |position| has coordinates in mercator.
+/// \note This method takes into acount only maps enumerated in countries.txt.
+bool IsPointCoveredByDownloadedMaps(m2::PointD const & position, Storage const & storage,
+                                    CountryInfoGetter const & countryInfoGetter);
+
+bool IsDownloadFailed(Status status);
+
+bool IsEnoughSpaceForDownload(MwmSize mwmSize);
+bool IsEnoughSpaceForDownload(CountryId const & countryId, Storage const & storage);
+bool IsEnoughSpaceForUpdate(CountryId const & countryId, Storage const & storage);
+
+/// \brief Calculates limit rect for |countryId| (expandable or not).
+/// \returns bounding box in mercator coordinates.
+m2::RectD CalcLimitRect(CountryId const & countryId, Storage const & storage,
+                        CountryInfoGetter const & countryInfoGetter);
+
+MwmSize GetRemoteSize(diffs::DiffsDataSource const & diffsDataSource,
+                      platform::CountryFile const & file);
+}  // namespace storage