new fs helper module

bsp_q7s/fs/FilesystemHelper.h

@@ -0,0 +1,49 @@
+#ifndef BSP_Q7S_MEMORY_FILESYSTEMHELPER_H_
+#define BSP_Q7S_MEMORY_FILESYSTEMHELPER_H_
+
+#include <string>
+
+#include "commonClassIds.h"
+#include "fsfw/returnvalues/returnvalue.h"
+
+/**
+ * @brief   This class implements often used functions related to the file system management.
+ *
+ * @author  J. Meier
+ */
+class FilesystemHelper {
+ public:
+  static const uint8_t INTERFACE_ID = CLASS_ID::FILE_SYSTEM_HELPER;
+
+  //! [EXPORT] : [COMMENT] SD card specified with path string not mounted
+  static const ReturnValue_t SD_NOT_MOUNTED = MAKE_RETURN_CODE(0xA0);
+  //! [EXPORT] : [COMMENT] Specified file does not exist on filesystem
+  static const ReturnValue_t FILE_NOT_EXISTS = MAKE_RETURN_CODE(0xA1);
+
+  /**
+   * @brief   In case the path points to a directory on the sd card, the function checks if the
+   *          appropriate SD card is mounted.
+   *
+   * @param path  Path to check
+   *
+   * @return  returnvalue::OK if path points to SD card and the appropriate SD card is mounted or if
+   *          path does not point to SD card.
+   *          Return error code if path points to SD card and the corresponding SD card is not
+   *          mounted.
+   */
+  static ReturnValue_t checkPath(std::string path);
+
+  /**
+   * @brief   Checks if the file exists on the filesystem.
+   *
+   * @param file   File to check
+   *
+   * @return  returnvalue::OK if file exists, otherwise return error code.
+   */
+  static ReturnValue_t fileExists(std::string file);
+
+ private:
+  FilesystemHelper();
+};
+
+#endif /* BSP_Q7S_MEMORY_FILESYSTEMHELPER_H_ */