1 #include <string> 2 #include <fstream> 3 4 // key names for properties we use 5 namespace properties { 6 extern const char* key; 7 extern const char* ref; 8 extern const char* props; 9 extern const char* is_default; 10 } 11 12 /** 13 * Class to store data on the unencrypted folder of a device. 14 * Note that the folder must exist before this class is constructed. 15 * All names must be valid single level (no '/') file or directory names 16 * Data is organized hierarchically so we can get a child folder 17 */ 18 class UnencryptedProperties 19 { 20 public: 21 // Get path of folder. Must create before using any properties 22 // This is to allow proper setting of SELinux policy 23 static std::string GetPath(const char* device); 24 25 // Opens properties folder on named device. 26 // If folder does not exist, OK will return false, all 27 // getters will return default properties and setters will fail. 28 UnencryptedProperties(const char* device); 29 30 // Get named object. Return default if object does not exist or error. 31 template<typename t> t Get(const char* name, t default_value = t()) const; 32 33 // Set named object. Return true if success, false otherwise 34 template<typename t> bool Set(const char* name, t const& value); 35 36 // Get child properties 37 UnencryptedProperties GetChild(const char* name) const; 38 39 // Remove named object 40 bool Remove(const char* name); 41 42 // Does folder exist? 43 bool OK() const; 44 45 private: 46 UnencryptedProperties(); 47 std::string folder_; 48 }; 49 50 51 template<typename t> t UnencryptedProperties::Get(const char* name, 52 t default_value) const 53 { 54 if (!OK()) return default_value; 55 t value = default_value; 56 std::ifstream(folder_ + "/" + name) >> value; 57 return value; 58 } 59 60 template<typename t> bool UnencryptedProperties::Set(const char* name, 61 t const& value) 62 { 63 if (!OK()) return false; 64 std::ofstream o(folder_ + "/" + name); 65 o << value; 66 return !o.fail(); 67 } 68 69 // Specialized getters/setters for strings 70 template<> std::string UnencryptedProperties::Get(const char* name, 71 std::string default_value) const; 72 73 template<> bool UnencryptedProperties::Set(const char* name, 74 std::string const& value); 75
