New cpp folder structure

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

libs/ge0/parser.hpp

@@ -0,0 +1,49 @@
+#pragma once
+
+#include <array>
+#include <cstddef>
+#include <cstdint>
+#include <string>
+
+namespace ge0
+{
+class Ge0Parser
+{
+public:
+  // Used by map/mwm_url.cpp.
+  static constexpr std::array<std::string_view, 6> kGe0Prefixes = {{
+      "https://comaps.at/", "cm://", "http://comaps.at/",
+      "ge0://", "http://ge0.me/", "https://ge0.me/"
+  }};
+
+  struct Result
+  {
+    double m_zoomLevel = 0.0;
+    double m_lat = 0.0;
+    double m_lon = 0.0;
+    std::string m_name;
+  };
+
+  Ge0Parser();
+
+  bool Parse(std::string const & url, Result & result);
+  bool ParseAfterPrefix(std::string const & url, size_t from, Result & result);
+
+protected:
+  uint8_t DecodeBase64Char(char const c);
+  static double DecodeZoom(uint8_t const zoomByte);
+  bool DecodeLatLon(std::string const & s, double & lat, double & lon);
+  bool DecodeLatLonToInt(std::string const & s, int & lat, int & lon);
+  double DecodeLatFromInt(int const lat, int const maxValue);
+  double DecodeLonFromInt(int const lon, int const maxValue);
+  std::string DecodeName(std::string name);
+  void SpacesToUnderscore(std::string & name);
+  void ValidateName(std::string & name);
+  static bool IsHexChar(char const a);
+
+private:
+  uint8_t m_base64ReverseCharTable[256];
+};
+
+std::string DebugPrint(Ge0Parser::Result const & r);
+}  // namespace ge0