Begin to declare interface to storage

Author: dhebbeker

lib/storage/storage.hpp

@@ -0,0 +1,23 @@
+#pragma once
+#include <FFat.h>
+#include <USBMSC.h>
+#include <cstddef>
+#include <esp_partition.h>
+
+class Storage
+{
+  public:
+    void begin(const char *partitionLabel = FFAT_PARTITION_LABEL);
+    void end();
+    bool isFileSystemReady() const;
+    void setCallbackFsReady();
+    void setCallbackFsBusy();
+
+  private:
+    const esp_partition_t *partition;
+    /**
+     * Interface to USB mass storage class.
+     */
+    USBMSC usbMsc;
+    const std::size_t blockSize;
+};