From 09caeffbc7a82ee262723ec13933fe65fc10be0f Mon Sep 17 00:00:00 2001
From: "Robin.Mueller" <robin.mueller.m@gmail.com>
Date: Tue, 1 Dec 2020 17:15:25 +0100
Subject: [PATCH] added new interface for file systems

---
 memory/HasFileSystemIF.h | 80 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 memory/HasFileSystemIF.h

diff --git a/memory/HasFileSystemIF.h b/memory/HasFileSystemIF.h
new file mode 100644
index 00000000..dcec6346
--- /dev/null
+++ b/memory/HasFileSystemIF.h
@@ -0,0 +1,80 @@
+#ifndef FSFW_MEMORY_HASFILESYSTEMIF_H_
+#define FSFW_MEMORY_HASFILESYSTEMIF_H_
+
+#include "../returnvalues/HasReturnvaluesIF.h"
+#include "../returnvalues/FwClassIds.h"
+#include "../ipc/messageQueueDefinitions.h"
+
+#include <cstddef>
+
+/**
+ * @brief	Generic interface for objects which expose a file system to enable
+ * 			message based file handling.
+ * @author  J. Meier, R. Mueller
+ */
+class HasFileSystemIF {
+public:
+    static constexpr uint8_t INTERFACE_ID = CLASS_ID::FILE_SYSTEM;
+
+    static constexpr ReturnValue_t FILE_DOES_NOT_EXIST = MAKE_RETURN_CODE(0x00);
+    static constexpr ReturnValue_t FILE_ALREADY_EXISTS = MAKE_RETURN_CODE(0x01);
+    static constexpr ReturnValue_t FILE_LOCKED = MAKE_RETURN_CODE(0x02);
+
+    static constexpr ReturnValue_t DIRECTORY_DOES_NOT_EXIST = MAKE_RETURN_CODE(0x03);
+    static constexpr ReturnValue_t DIRECTORY_ALREADY_EXISTS = MAKE_RETURN_CODE(0x04);
+    static constexpr ReturnValue_t DIRECTORY_NOT_EMPTY = MAKE_RETURN_CODE(0x05);
+
+
+    static constexpr ReturnValue_t SEQUENCE_PACKET_MISSING_WRITE = MAKE_RETURN_CODE(0x06); //! P1: Sequence number missing
+    static constexpr ReturnValue_t SEQUENCE_PACKET_MISSING_READ = MAKE_RETURN_CODE(0x07); //! P1: Sequence number missing
+
+	virtual ~HasFileSystemIF() {}
+	/**
+	 * Function to get the MessageQueueId_t of the implementing object
+	 * @return MessageQueueId_t of the object
+	 */
+	virtual MessageQueueId_t getCommandQueue() const = 0;
+
+	/**
+	 * Generic function to append to file.
+	 * @param dirname Directory of the file
+	 * @param filename The filename of the file
+	 * @param data The data to write to the file
+	 * @param size The size of the data to write
+	 * @param packetNumber Current packet number. Can be used to verify that
+	 * there are no missing packets.
+	 * @param args Any other arguments which an implementation might require.
+	 * @param bytesWritten Actual bytes written to file
+	 * For large files the write procedure must be split in multiple calls
+	 * to writeToFile
+	 */
+	virtual ReturnValue_t appendToFile(const char* repositoryPath,
+	        const char* filename, const uint8_t* data, size_t size,
+	        uint16_t packetNumber, void* args = nullptr) = 0;
+
+	/**
+	 * Generic function to create a new file.
+	 * @param repositoryPath
+	 * @param filename
+	 * @param data
+	 * @param size
+	 * @param args Any other arguments which an implementation might require.
+	 * @return
+	 */
+	virtual ReturnValue_t createFile(const char* repositoryPath,
+	        const char* filename, const uint8_t* data = nullptr,
+	        size_t size = 0, void* args = nullptr) = 0;
+
+	/**
+	 * Generic function to delete a file.
+	 * @param repositoryPath
+	 * @param filename
+	 * @param args
+	 * @return
+	 */
+	virtual ReturnValue_t deleteFile(const char* repositoryPath,
+	        const char* filename, void* args = nullptr) = 0;
+};
+
+
+#endif /* FSFW_MEMORY_HASFILESYSTEMIF_H_ */