New cpp folder structure

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

libs/platform/downloader_utils.cpp

@@ -0,0 +1,82 @@
+#include "platform/downloader_utils.hpp"
+
+#include "platform/country_defines.hpp"
+#include "platform/country_file.hpp"
+#include "platform/local_country_file_utils.hpp"
+
+#include "coding/url.hpp"
+
+#include "base/string_utils.hpp"
+
+#include "std/target_os.hpp"
+
+namespace
+{
+std::string const kMapsPath = "maps";
+std::string const kDiffsPath = "diffs";
+}  // namespace
+
+namespace downloader
+{
+
+std::string GetFileDownloadUrl(std::string const & fileName, int64_t dataVersion, uint64_t diffVersion /* = 0 */)
+{
+  if (diffVersion == 0)
+    return url::Join(kMapsPath, strings::to_string(dataVersion), url::UrlEncode(fileName));
+
+  return url::Join(kDiffsPath, strings::to_string(dataVersion), strings::to_string(diffVersion),
+                   url::UrlEncode(fileName));
+}
+
+bool IsUrlSupported(std::string const & url)
+{
+  auto const urlComponents = strings::Tokenize(url, "/");
+  if (urlComponents.empty())
+    return false;
+
+  if (urlComponents[0] != kMapsPath && urlComponents[0] != kDiffsPath)
+    return false;
+
+  if (urlComponents[0] == kMapsPath && urlComponents.size() != 3)
+    return false;
+
+  if (urlComponents[0] == kDiffsPath && urlComponents.size() != 4)
+    return false;
+
+  uint64_t dataVersion = 0;
+  if (!strings::to_uint(urlComponents[1], dataVersion))
+    return false;
+
+  if (urlComponents[0] == kDiffsPath)
+  {
+    uint64_t diffVersion = 0;
+    if (!strings::to_uint(urlComponents[2], diffVersion))
+      return false;
+  }
+
+  size_t count = 0;
+  strings::Tokenize(url::UrlDecode(urlComponents.back()), ".", [&count](std::string_view)
+  {
+    ++count;
+  });
+  return count == 2;
+}
+
+std::string GetFilePathByUrl(std::string const & url)
+{
+  auto const urlComponents = strings::Tokenize(url, "/");
+  CHECK_GREATER(urlComponents.size(), 2, (urlComponents));
+  CHECK_LESS(urlComponents.size(), 5, (urlComponents));
+
+  uint64_t dataVersion = 0;
+  CHECK(strings::to_uint(urlComponents[1], dataVersion), ());
+
+  std::string mwmFile = url::UrlDecode(urlComponents.back());
+  // remove extension
+  mwmFile = mwmFile.substr(0, mwmFile.find('.'));
+
+  auto const fileType = urlComponents[0] == kDiffsPath ? MapFileType::Diff : MapFileType::Map;
+  return platform::GetFileDownloadPath(dataVersion, mwmFile, fileType);
+}
+
+}  // namespace downloader