CHANGELOG.md

@@ -58,6 +58,32 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - `DeviceHandlerBase`: New signature of `handleDeviceTm` which expects
   a `const SerializeIF&` and additional helper variant which expects `const uint8_t*`
   PR: https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/671
+- Improvements for `AcceptsTelemetryIF` and `AcceptsTelecommandsIF`:
+  - Make functions `const` where it makes sense
+  - Add `const char* getName const` abstract function
+  PR: https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/684
+- Move some generic `StorageManagerIF` implementations from `LocalPool` to
+  interface itself so it can be re-used more easily. Also add new
+  abstract function `bool hasDataAtId(store_address_t storeId) const`.
+  PR: https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/685
+
+## CFDP
+
+- Refactoring of CFDP stack which was done during implementation of the CFDP source and destination
+  handlers.
+   - New filesystem module, changes for filesystem abstraction `HasFileSystemIF` to better
+     fit requirements of CFDP
+   - New `HostFilesystem` implementation of the `HasFileSystemIF`
+   - New `cfdp::UserBase` class which is the abstraction for the CFDP user in an OBSW context.
+   - mib module for the CFDP stack
+   - PDU classes renamed from `...Serializer`/`...Deserializer` to `...Creator`/`...Reader`
+     respetively
+   - Renamed `TcDistributor` to `TcDistributorBase` to prevent confusion
+   - Refactored `TcDisitributorBase` to be more flexible and usable for CFDP distribution
+   - Renamed `CCSDSDistributor` to `CcsdsDistributor` and add feature which allows it
+     to remove the CCSDS header when routing a packet. This allows CCSDS agnostic receiver
+     implementation without an extra component
+  PR: https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/682
 
 # [v5.0.0] 25.07.2022
 

CMakeLists.txt

@@ -104,7 +104,8 @@ if(FSFW_GENERATE_SECTIONS)
   option(FSFW_REMOVE_UNUSED_CODE "Remove unused code" ON)
 endif()
 
-option(FSFW_BUILD_TESTS "Build unittest binary in addition to static library"
+option(FSFW_BUILD_TESTS
+       "Build unittest binary in addition to static library. Requires Catch2"
        OFF)
 option(FSFW_CICD_BUILD "Build for CI/CD. This can disable problematic test" OFF)
 option(FSFW_BUILD_DOCS "Build documentation with Sphinx and Doxygen" OFF)
@@ -115,7 +116,6 @@ endif()
 option(FSFW_WARNING_SHADOW_LOCAL_GCC "Enable -Wshadow=local warning in GCC" ON)
 # Options to exclude parts of the FSFW from compilation.
 option(FSFW_ADD_INTERNAL_TESTS "Add internal unit tests" ON)
-option(FSFW_ADD_UNITTESTS "Add regular unittests. Requires Catch2" OFF)
 option(FSFW_ADD_HAL "Add Hardware Abstraction Layer" ON)
 
 if(UNIX)

docs/api.rst

@@ -4,6 +4,7 @@ API
 .. toctree::
    :maxdepth: 4
 
+   api/cfdp
    api/objectmanager
    api/task
    api/ipc

docs/api/cfdp.rst

@@ -0,0 +1,8 @@
+CFDP API
+=================
+
+``UserBase``
+-----------------
+
+.. doxygenclass:: cfdp::UserBase
+	:members:

docs/conf.py

@@ -17,12 +17,12 @@
 
 # -- Project information -----------------------------------------------------
 
-project = 'Flight Software Framework'
+project = "Flight Software Framework"
-copyright = '2021, Institute of Space Systems (IRS)'
+copyright = "2021, Institute of Space Systems (IRS)"
-author = 'Institute of Space Systems (IRS)'
+author = "Institute of Space Systems (IRS)"
 
 # The full version, including alpha/beta/rc tags
-release = '2.0.1'
+release = "5.0.0"
 
 
 # -- General configuration ---------------------------------------------------
@@ -30,17 +30,17 @@ release = '2.0.1'
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
-extensions = [ "breathe" ]
+extensions = ["breathe"]
 
 breathe_default_project = "fsfw"
 
 # Add any paths that contain templates here, relative to this directory.
-templates_path = ['_templates']
+templates_path = ["_templates"]
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 # This pattern also affects html_static_path and html_extra_path.
-exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
+exclude_patterns = ["_build", "Thumbs.db", ".DS_Store"]
 
 
 # -- Options for HTML output -------------------------------------------------
@@ -48,7 +48,7 @@ exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = 'alabaster'
+html_theme = "alabaster"
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,

docs/highlevel.rst

@@ -7,12 +7,14 @@ Structure
 ----------
 
 The general structure is driven by the usage of interfaces provided by objects.
-The FSFW uses C++11 as baseline. The intention behind this is that this C++ Standard should be
+The FSFW uses C++17 as baseline.
-widely available, even with older compilers.
+It also uses dynamic allocation during the initialization but provides
-The FSFW uses dynamic allocation during the initialization but provides static containers during runtime.
+static containers during runtime.
-This simplifies the instantiation of objects and allows the usage of some standard containers.
+This simplifies the instantiation of objects and allows the usage of some
-Dynamic Allocation after initialization is discouraged and different solutions are provided in the
+standard containers.
-FSFW to achieve that. The fsfw uses run-time type information but exceptions are not allowed.
+Dynamic Allocation after initialization is discouraged and different solutions
+are provided in the FSFW to achieve that. The fsfw uses run-time type
+information but will not throw exceptions.
 
 Failure Handling
 -----------------

misc/defaultcfg/fsfwconfig/objects/FsfwFactory.cpp

@@ -4,7 +4,6 @@
 #include <fsfw/devicehandlers/DeviceHandlerBase.h>
 #include <fsfw/events/EventManager.h>
 #include <fsfw/health/HealthTable.h>
-#include <fsfw/tmtcpacket/pus/tm/TmPacketStored.h>
 #include <fsfw/tmtcservices/CommandingServiceBase.h>
 #include <fsfw/tmtcservices/PusServiceBase.h>
 #include <fsfw/internalerror/InternalErrorReporter.h>
@@ -41,13 +40,9 @@ void Factory::setStaticFrameworkObjectIds() {
 	CommandingServiceBase::defaultPacketSource = objects::NO_OBJECT;
 	CommandingServiceBase::defaultPacketDestination = objects::NO_OBJECT;
 
-	VerificationReporter::messageReceiver = objects::PUS_SERVICE_1_VERIFICATION;
-
 	DeviceHandlerBase::powerSwitcherId = objects::NO_OBJECT;
 	DeviceHandlerBase::rawDataReceiverId = objects::PUS_SERVICE_2_DEVICE_ACCESS;
 
 	DeviceHandlerFailureIsolation::powerConfirmationId = objects::NO_OBJECT;
-
-	TmPacketBase::timeStamperId = objects::NO_OBJECT;
 }
 

scripts/auto-formatter.sh

@@ -12,7 +12,8 @@ cmake_fmt="cmake-format"
 file_selectors="-iname CMakeLists.txt"
 if command -v ${cmake_fmt} &> /dev/null; then
   ${cmake_fmt} -i CMakeLists.txt
-  find ./src ${file_selectors} | xargs ${cmake_fmt}  -i
+  find ./src ${file_selectors} | xargs ${cmake_fmt} -i
+  find ./unittests ${file_selectors} | xargs ${cmake_fmt} -i
 else
   echo "No ${cmake_fmt} tool found, not formatting CMake files"
 fi

scripts/helper.py

@@ -51,7 +51,7 @@ def main():
     parser.add_argument(
         "-g",
         "--generators",
-        default = "Ninja",
+        default="Ninja",
         action="store",
         help="CMake generators",
     )
@@ -165,10 +165,18 @@ def create_tests_build_cfg(args):
     os.mkdir(UNITTEST_FOLDER_NAME)
     os.chdir(UNITTEST_FOLDER_NAME)
     if args.windows:
-        cmake_cmd = 'cmake -G "' + args.generators + '" -DFSFW_OSAL=host -DFSFW_BUILD_TESTS=ON \
+        cmake_cmd = (
+            'cmake -G "'
+            + args.generators
+            + '" -DFSFW_OSAL=host -DFSFW_BUILD_TESTS=ON \
         -DGCOVR_PATH="py -m gcovr" ..'
+        )
     else:
-        cmake_cmd = 'cmake -G "' + args.generators + '" -DFSFW_OSAL=host -DFSFW_BUILD_TESTS=ON ..'
+        cmake_cmd = (
+            'cmake -G "'
+            + args.generators
+            + '" -DFSFW_OSAL=host -DFSFW_BUILD_TESTS=ON ..'
+        )
     cmd_runner(cmake_cmd)
     os.chdir("..")
 

src/fsfw/CMakeLists.txt

@@ -31,6 +31,7 @@ add_subdirectory(thermal)
 add_subdirectory(timemanager)
 add_subdirectory(tmtcpacket)
 add_subdirectory(tmtcservices)
+add_subdirectory(filesystem)
 
 # Optional
 

src/fsfw/cfdp.h

@@ -0,0 +1,13 @@
+#ifndef FSFW_CFDP_H
+#define FSFW_CFDP_H
+
+#include "cfdp/definitions.h"
+#include "cfdp/handler/CfdpHandler.h"
+#include "cfdp/handler/DestHandler.h"
+#include "cfdp/handler/FaultHandlerBase.h"
+#include "cfdp/helpers.h"
+#include "cfdp/tlv/Lv.h"
+#include "cfdp/tlv/StringLv.h"
+#include "cfdp/tlv/Tlv.h"
+
+#endif  // FSFW_CFDP_H

src/fsfw/cfdp/CMakeLists.txt

@@ -1,4 +1,6 @@
-target_sources(${LIB_FSFW_NAME} PRIVATE CfdpHandler.cpp CfdpMessage.cpp)
+target_sources(${LIB_FSFW_NAME} PRIVATE CfdpMessage.cpp CfdpDistributor.cpp
+                                        VarLenFields.cpp helpers.cpp)
 
 add_subdirectory(pdu)
 add_subdirectory(tlv)
+add_subdirectory(handler)

src/fsfw/cfdp/CfdpDistributor.cpp

@@ -0,0 +1,55 @@
+#include "CfdpDistributor.h"
+
+#include "fsfw/tcdistribution/definitions.h"
+
+CfdpDistributor::CfdpDistributor(CfdpDistribCfg cfg)
+    : TcDistributorBase(cfg.objectId, cfg.tcQueue), cfg(cfg) {}
+
+ReturnValue_t CfdpDistributor::registerTcDestination(const cfdp::EntityId& address,
+                                                     AcceptsTelecommandsIF& tcDest) {
+  for (const auto& dest : tcDestinations) {
+    if (dest.id == address) {
+      return returnvalue::FAILED;
+    }
+  }
+  tcDestinations.emplace_back(address, tcDest.getName(), tcDest.getRequestQueue());
+  return returnvalue::OK;
+}
+
+ReturnValue_t CfdpDistributor::selectDestination(MessageQueueId_t& destId) {
+  auto accessorPair = cfg.tcStore.getData(currentMessage.getStorageId());
+  if (accessorPair.first != returnvalue::OK) {
+    return accessorPair.first;
+  }
+  ReturnValue_t result =
+      pduReader.setReadOnlyData(accessorPair.second.data(), accessorPair.second.size());
+  if (result != returnvalue::OK) {
+    return result;
+  }
+  result = pduReader.parseData();
+  if (result != returnvalue::OK) {
+    return result;
+  }
+  cfdp::EntityId foundId;
+  pduReader.getDestId(foundId);
+  bool destFound = false;
+  for (const auto& dest : tcDestinations) {
+    if (dest.id == foundId) {
+      destId = dest.queueId;
+      destFound = true;
+    }
+  }
+  if (not destFound) {
+    // TODO: Warning and event?
+    return tmtcdistrib::NO_DESTINATION_FOUND;
+  }
+  // Packet was forwarded successfully, so do not delete it.
+  accessorPair.second.release();
+  return returnvalue::OK;
+}
+
+const char* CfdpDistributor::getName() const { return "CFDP Distributor"; }
+
+uint32_t CfdpDistributor::getIdentifier() const { return 0; }
+
+MessageQueueId_t CfdpDistributor::getRequestQueue() const { return tcQueue->getId(); }

src/fsfw/cfdp/CfdpDistributor.h

@@ -0,0 +1,76 @@
+#ifndef FSFW_TCDISTRIBUTION_CFDPDISTRIBUTOR_H_
+#define FSFW_TCDISTRIBUTION_CFDPDISTRIBUTOR_H_
+
+#include <utility>
+#include <vector>
+
+#include "fsfw/cfdp/pdu/PduHeaderReader.h"
+#include "fsfw/returnvalues/returnvalue.h"
+#include "fsfw/tcdistribution/CfdpPacketChecker.h"
+#include "fsfw/tcdistribution/TcDistributorBase.h"
+#include "fsfw/tmtcpacket/cfdp/CfdpPacketStored.h"
+#include "fsfw/tmtcservices/AcceptsTelecommandsIF.h"
+#include "fsfw/tmtcservices/VerificationReporter.h"
+
+struct CfdpDistribCfg {
+  CfdpDistribCfg(object_id_t objectId, StorageManagerIF& tcStore, MessageQueueIF* tcQueue)
+      : objectId(objectId), tcStore(tcStore), tcQueue(tcQueue) {}
+
+  object_id_t objectId;
+  StorageManagerIF& tcStore;
+  MessageQueueIF* tcQueue;
+};
+
+/**
+ * This will be the primary component to perform PDU forwading procedures. This includes forwarding
+ * CFDP TC packets to registered source or destination handlers, and forwarding all telemetry
+ * generated by them to registered TM sinks.
+ * @ingroup tc_distribution
+ */
+class CfdpDistributor : public TcDistributorBase, public AcceptsTelecommandsIF {
+ public:
+  /**
+   * The ctor passes @c set_apid to the checker class and calls the
+   * TcDistribution ctor with a certain object id.
+   * @param setApid The APID of this receiving Application.
+   * @param setObjectId Object ID of the distributor itself
+   * @param setPacketSource Object ID of the source of TC packets.
+   * Must implement CcsdsDistributorIF.
+   */
+  explicit CfdpDistributor(CfdpDistribCfg cfg);
+
+  [[nodiscard]] const char* getName() const override;
+  [[nodiscard]] uint32_t getIdentifier() const override;
+  [[nodiscard]] MessageQueueId_t getRequestQueue() const override;
+
+  /**
+   * Register a new CFDP entity which can receive PDUs.
+   * @param address
+   * @param tcDest
+   * @return
+   *  - @c RETURN_FAILED: Entry already exists for the given address
+   */
+  ReturnValue_t registerTcDestination(const cfdp::EntityId& address, AcceptsTelecommandsIF& tcDest);
+
+ protected:
+  struct EntityInfo {
+    EntityInfo(cfdp::EntityId id, const char* name, MessageQueueId_t queueId)
+        : id(std::move(id)), name(name), queueId(queueId) {}
+    cfdp::EntityId id;
+    const char* name;
+    MessageQueueId_t queueId;
+  };
+  PduHeaderReader pduReader;
+  ReturnValue_t lastTcError = returnvalue::OK;
+  ReturnValue_t lastTmError = returnvalue::OK;
+  // I don't think a regular OBSW will have more than 1 or 2 of these destinations, so I think
+  // it is okay to accept the overhead here
+  std::vector<EntityInfo> tcDestinations;
+  CfdpDistribCfg cfg;
+
+  ReturnValue_t selectDestination(MessageQueueId_t& destId) override;
+
+ private:
+};
+
+#endif /* FSFW_TCDISTRIBUTION_CFDPDISTRIBUTOR_H_ */

src/fsfw/cfdp/CfdpHandler.cpp

@@ -1,58 +0,0 @@
-#include "fsfw/cfdp/CfdpHandler.h"
-
-#include "fsfw/cfdp/CfdpMessage.h"
-#include "fsfw/ipc/CommandMessage.h"
-#include "fsfw/ipc/QueueFactory.h"
-#include "fsfw/storagemanager/storeAddress.h"
-#include "fsfw/tmtcservices/AcceptsTelemetryIF.h"
-
-object_id_t CfdpHandler::packetSource = 0;
-object_id_t CfdpHandler::packetDestination = 0;
-
-CfdpHandler::CfdpHandler(object_id_t setObjectId, CFDPDistributor* dist)
-    : SystemObject(setObjectId) {
-  auto mqArgs = MqArgs(setObjectId, static_cast<void*>(this));
-  requestQueue = QueueFactory::instance()->createMessageQueue(
-      CFDP_HANDLER_MAX_RECEPTION, MessageQueueMessage::MAX_MESSAGE_SIZE, &mqArgs);
-  distributor = dist;
-}
-
-CfdpHandler::~CfdpHandler() = default;
-
-ReturnValue_t CfdpHandler::initialize() {
-  ReturnValue_t result = SystemObject::initialize();
-  if (result != returnvalue::OK) {
-    return result;
-  }
-  this->distributor->registerHandler(this);
-  return returnvalue::OK;
-}
-
-ReturnValue_t CfdpHandler::handleRequest(store_address_t storeId) {
-#if FSFW_VERBOSE_LEVEL >= 1
-#if FSFW_CPP_OSTREAM_ENABLED == 1
-  sif::debug << "CFDPHandler::handleRequest" << std::endl;
-#else
-  sif::printDebug("CFDPHandler::handleRequest\n");
-#endif /* !FSFW_CPP_OSTREAM_ENABLED == 1 */
-#endif
-
-  // TODO read out packet from store using storeId
-
-  return returnvalue::OK;
-}
-
-ReturnValue_t CfdpHandler::performOperation(uint8_t opCode) {
-  ReturnValue_t status = returnvalue::OK;
-  CommandMessage currentMessage;
-  for (status = this->requestQueue->receiveMessage(&currentMessage); status == returnvalue::OK;
-       status = this->requestQueue->receiveMessage(&currentMessage)) {
-    store_address_t storeId = CfdpMessage::getStoreId(&currentMessage);
-    this->handleRequest(storeId);
-  }
-  return returnvalue::OK;
-}
-
-uint16_t CfdpHandler::getIdentifier() { return 0; }
-
-MessageQueueId_t CfdpHandler::getRequestQueue() { return this->requestQueue->getId(); }

src/fsfw/cfdp/CfdpHandler.h

@@ -1,60 +0,0 @@
-#ifndef FSFW_CFDP_CFDPHANDLER_H_
-#define FSFW_CFDP_CFDPHANDLER_H_
-
-#include "fsfw/ipc/MessageQueueIF.h"
-#include "fsfw/objectmanager/SystemObject.h"
-#include "fsfw/returnvalues/returnvalue.h"
-#include "fsfw/tasks/ExecutableObjectIF.h"
-#include "fsfw/tcdistribution/CFDPDistributor.h"
-#include "fsfw/tmtcservices/AcceptsTelecommandsIF.h"
-
-namespace Factory {
-void setStaticFrameworkObjectIds();
-}
-
-class CfdpHandler : public ExecutableObjectIF, public AcceptsTelecommandsIF, public SystemObject {
-  friend void(Factory::setStaticFrameworkObjectIds)();
-
- public:
-  CfdpHandler(object_id_t setObjectId, CFDPDistributor* distributor);
-  /**
-   * The destructor is empty.
-   */
-  virtual ~CfdpHandler();
-
-  virtual ReturnValue_t handleRequest(store_address_t storeId);
-
-  virtual ReturnValue_t initialize() override;
-  virtual uint16_t getIdentifier() override;
-  MessageQueueId_t getRequestQueue() override;
-  ReturnValue_t performOperation(uint8_t opCode) override;
-
- protected:
-  /**
-   * This is a complete instance of the telecommand reception queue
-   * of the class. It is initialized on construction of the class.
-   */
-  MessageQueueIF* requestQueue = nullptr;
-
-  CFDPDistributor* distributor = nullptr;
-
-  /**
-   * The current CFDP packet to be processed.
-   * It is deleted after handleRequest was executed.
-   */
-  CfdpPacketStored currentPacket;
-
-  static object_id_t packetSource;
-
-  static object_id_t packetDestination;
-
- private:
-  /**
-   * This constant sets the maximum number of packets accepted per call.
-   * Remember that one packet must be completely handled in one
-   * #handleRequest call.
-   */
-  static const uint8_t CFDP_HANDLER_MAX_RECEPTION = 100;
-};
-
-#endif /* FSFW_CFDP_CFDPHANDLER_H_ */

src/fsfw/cfdp/FileSize.h

@@ -1,5 +1,7 @@
-#ifndef FSFW_SRC_FSFW_CFDP_FILESIZE_H_
+#ifndef FSFW_CFDP_FILESIZE_H_
-#define FSFW_SRC_FSFW_CFDP_FILESIZE_H_
+#define FSFW_CFDP_FILESIZE_H_
+
+#include <optional>
 
 #include "fsfw/serialize/SerializeAdapter.h"
 #include "fsfw/serialize/SerializeIF.h"
@@ -8,9 +10,11 @@ namespace cfdp {
 
 struct FileSize : public SerializeIF {
  public:
-  FileSize() : largeFile(false){};
+  FileSize() = default;
 
-  FileSize(uint64_t fileSize, bool isLarge = false) { setFileSize(fileSize, isLarge); };
+  explicit FileSize(uint64_t fileSize, bool isLarge = false) { setFileSize(fileSize, isLarge); };
+
+  [[nodiscard]] uint64_t value() const { return fileSize; }
 
   ReturnValue_t serialize(bool isLarge, uint8_t **buffer, size_t *size, size_t maxSize,
                           Endianness streamEndianness) {
@@ -27,7 +31,7 @@ struct FileSize : public SerializeIF {
     return SerializeAdapter::serialize(&fileSize, buffer, size, maxSize, streamEndianness);
   }
 
-  size_t getSerializedSize() const override {
+  [[nodiscard]] size_t getSerializedSize() const override {
     if (largeFile) {
       return 8;
     } else {
@@ -50,20 +54,22 @@ struct FileSize : public SerializeIF {
     }
   }
 
-  ReturnValue_t setFileSize(uint64_t fileSize, bool largeFile) {
+  ReturnValue_t setFileSize(uint64_t fileSize_, std::optional<bool> largeFile_) {
+    if (largeFile_) {
+      largeFile = largeFile_.value();
+    }
     if (not largeFile and fileSize > UINT32_MAX) {
       // TODO: emit warning here
       return returnvalue::FAILED;
     }
-    this->fileSize = fileSize;
+    this->fileSize = fileSize_;
-    this->largeFile = largeFile;
     return returnvalue::OK;
   }
 
-  bool isLargeFile() const { return largeFile; }
+  [[nodiscard]] bool isLargeFile() const { return largeFile; }
-  uint64_t getSize(bool *largeFile = nullptr) const {
+  uint64_t getSize(bool *largeFile_ = nullptr) const {
-    if (largeFile != nullptr) {
+    if (largeFile_ != nullptr) {
-      *largeFile = this->largeFile;
+      *largeFile_ = this->largeFile;
     }
     return fileSize;
   }
@@ -75,4 +81,4 @@ struct FileSize : public SerializeIF {
 
 }  // namespace cfdp
 
-#endif /* FSFW_SRC_FSFW_CFDP_FILESIZE_H_ */
+#endif /* FSFW_CFDP_FILESIZE_H_ */

src/fsfw/cfdp/VarLenFields.cpp

@@ -1,6 +1,5 @@
-#include "VarLenField.h"
+#include "VarLenFields.h"
 
-#include "fsfw/FSFW.h"
 #include "fsfw/serialize/SerializeAdapter.h"
 #include "fsfw/serviceinterface.h"
 
@@ -21,27 +20,27 @@ cfdp::VarLenField::VarLenField() : width(cfdp::WidthInBytes::ONE_BYTE) { value.o
 
 cfdp::WidthInBytes cfdp::VarLenField::getWidth() const { return width; }
 
-ReturnValue_t cfdp::VarLenField::setValue(cfdp::WidthInBytes widthInBytes, size_t value) {
+ReturnValue_t cfdp::VarLenField::setValue(cfdp::WidthInBytes widthInBytes, size_t value_) {
   switch (widthInBytes) {
     case (cfdp::WidthInBytes::ONE_BYTE): {
-      if (value > UINT8_MAX) {
+      if (value_ > UINT8_MAX) {
         return returnvalue::FAILED;
       }
-      this->value.oneByte = value;
+      this->value.oneByte = value_;
       break;
     }
     case (cfdp::WidthInBytes::TWO_BYTES): {
-      if (value > UINT16_MAX) {
+      if (value_ > UINT16_MAX) {
         return returnvalue::FAILED;
       }
-      this->value.twoBytes = value;
+      this->value.twoBytes = value_;
       break;
     }
     case (cfdp::WidthInBytes::FOUR_BYTES): {
-      if (value > UINT32_MAX) {
+      if (value_ > UINT32_MAX) {
         return returnvalue::FAILED;
       }
-      this->value.fourBytes = value;
+      this->value.fourBytes = value_;
       break;
     }
     default: {
@@ -93,9 +92,9 @@ ReturnValue_t cfdp::VarLenField::serialize(uint8_t **buffer, size_t *size, size_
 
 size_t cfdp::VarLenField::getSerializedSize() const { return width; }
 
-ReturnValue_t cfdp::VarLenField::deSerialize(cfdp::WidthInBytes width, const uint8_t **buffer,
+ReturnValue_t cfdp::VarLenField::deSerialize(cfdp::WidthInBytes width_, const uint8_t **buffer,
                                              size_t *size, Endianness streamEndianness) {
-  this->width = width;
+  this->width = width_;
   return deSerialize(buffer, size, streamEndianness);
 }
 
@@ -118,3 +117,21 @@ ReturnValue_t cfdp::VarLenField::deSerialize(const uint8_t **buffer, size_t *siz
     }
   }
 }
+
+bool cfdp::VarLenField::operator<(const cfdp::VarLenField &other) const {
+  if (getWidth() < other.getWidth()) {
+    return true;
+  } else if (getWidth() == other.getWidth()) {
+    return getValue() < other.getValue();
+  } else {
+    return false;
+  }
+}
+
+bool cfdp::VarLenField::operator==(const cfdp::VarLenField &other) const {
+  return getWidth() == other.getWidth() and getValue() == other.getValue();
+}
+
+bool cfdp::VarLenField::operator!=(const cfdp::VarLenField &other) const {
+  return not(*this == other);
+}

src/fsfw/cfdp/VarLenFields.h

@@ -0,0 +1,107 @@
+#ifndef FSFW_CFDP_PDU_VARLENFIELD_H_
+#define FSFW_CFDP_PDU_VARLENFIELD_H_
+
+#include <cstddef>
+#include <cstdint>
+#include <utility>
+
+#include "fsfw/cfdp/definitions.h"
+#include "fsfw/serialize/SerializeIF.h"
+#include "fsfw/serviceinterface.h"
+#include "fsfw/util/UnsignedByteField.h"
+
+namespace cfdp {
+
+class VarLenField : public SerializeIF {
+ public:
+  union LengthFieldLen {
+    uint8_t oneByte;
+    uint16_t twoBytes;
+    uint32_t fourBytes;
+    uint64_t eightBytes;
+  };
+
+  VarLenField();
+  template <typename T>
+  explicit VarLenField(UnsignedByteField<T> byteField);
+
+  VarLenField(cfdp::WidthInBytes width, size_t value);
+
+  bool operator==(const VarLenField &other) const;
+  bool operator!=(const VarLenField &other) const;
+  bool operator<(const VarLenField &other) const;
+
+  ReturnValue_t setValue(cfdp::WidthInBytes, size_t value);
+
+  ReturnValue_t serialize(uint8_t **buffer, size_t *size, size_t maxSize,
+                          Endianness streamEndianness) const override;
+
+  [[nodiscard]] size_t getSerializedSize() const override;
+
+  ReturnValue_t deSerialize(cfdp::WidthInBytes width, const uint8_t **buffer, size_t *size,
+                            Endianness streamEndianness);
+
+  [[nodiscard]] cfdp::WidthInBytes getWidth() const;
+  [[nodiscard]] size_t getValue() const;
+
+#if FSFW_CPP_OSTREAM_ENABLED == 1
+  friend std::ostream &operator<<(std::ostream &os, const VarLenField &id) {
+    os << "dec: " << id.getValue() << ", hex: " << std::hex << std::setw(id.getWidth())
+       << std::setfill('0') << id.getValue() << std::dec << std::setfill('0');
+    return os;
+  }
+#endif
+
+ private:
+  ReturnValue_t deSerialize(const uint8_t **buffer, size_t *size,
+                            Endianness streamEndianness) override;
+
+  cfdp::WidthInBytes width;
+  LengthFieldLen value{};
+};
+
+template <typename T>
+cfdp::VarLenField::VarLenField(UnsignedByteField<T> byteField)
+    : width(static_cast<cfdp::WidthInBytes>(sizeof(T))) {
+  static_assert((sizeof(T) % 2) == 0);
+  setValue(width, byteField.getValue());
+}
+
+struct EntityId : public VarLenField {
+ public:
+  EntityId() : VarLenField() {}
+  template <typename T>
+  explicit EntityId(UnsignedByteField<T> byteField) : VarLenField(byteField) {}
+  EntityId(cfdp::WidthInBytes width, size_t entityId) : VarLenField(width, entityId) {}
+};
+
+struct TransactionSeqNum : public VarLenField {
+ public:
+  TransactionSeqNum() : VarLenField() {}
+  template <typename T>
+  explicit TransactionSeqNum(UnsignedByteField<T> byteField) : VarLenField(byteField) {}
+  TransactionSeqNum(cfdp::WidthInBytes width, size_t seqNum) : VarLenField(width, seqNum) {}
+};
+
+struct TransactionId {
+  TransactionId() = default;
+  TransactionId(EntityId entityId, TransactionSeqNum seqNum)
+      : entityId(std::move(entityId)), seqNum(std::move(seqNum)) {}
+
+  bool operator==(const TransactionId &other) const {
+    return entityId == other.entityId and seqNum == other.seqNum;
+  }
+
+#if FSFW_CPP_OSTREAM_ENABLED == 1
+  friend std::ostream &operator<<(std::ostream &os, const TransactionId &id) {
+    os << "Source ID { " << id.entityId << " }, Sequence Number " << id.seqNum.getValue();
+    return os;
+  }
+#endif
+  EntityId entityId;
+  TransactionSeqNum seqNum;
+};
+
+}  // namespace cfdp
+
+#endif /* FSFW_CFDP_PDU_VARLENFIELD_H_ */

src/fsfw/cfdp/definitions.h

@@ -11,12 +11,16 @@
 
 namespace cfdp {
 
-static constexpr uint8_t VERSION_BITS = 0b00100000;
+static constexpr char CFDP_VERSION_2_NAME[] = "CCSDS 727.0-B-5";
+
+// Second version of the protocol, only this one is supported here
+static constexpr uint8_t CFDP_VERSION_2 = 0b001;
+static constexpr uint8_t VERSION_BITS = CFDP_VERSION_2 << 5;
 
 static constexpr uint8_t CFDP_CLASS_ID = CLASS_ID::CFDP;
 
 static constexpr ReturnValue_t INVALID_TLV_TYPE = returnvalue::makeCode(CFDP_CLASS_ID, 1);
-static constexpr ReturnValue_t INVALID_DIRECTIVE_FIELDS = returnvalue::makeCode(CFDP_CLASS_ID, 2);
+static constexpr ReturnValue_t INVALID_DIRECTIVE_FIELD = returnvalue::makeCode(CFDP_CLASS_ID, 2);
 static constexpr ReturnValue_t INVALID_PDU_DATAFIELD_LEN = returnvalue::makeCode(CFDP_CLASS_ID, 3);
 static constexpr ReturnValue_t INVALID_ACK_DIRECTIVE_FIELDS =
     returnvalue::makeCode(CFDP_CLASS_ID, 4);
@@ -26,13 +30,14 @@ static constexpr ReturnValue_t METADATA_CANT_PARSE_OPTIONS =
     returnvalue::makeCode(CFDP_CLASS_ID, 5);
 static constexpr ReturnValue_t NAK_CANT_PARSE_OPTIONS = returnvalue::makeCode(CFDP_CLASS_ID, 6);
 static constexpr ReturnValue_t FINISHED_CANT_PARSE_FS_RESPONSES =
-    returnvalue::makeCode(CFDP_CLASS_ID, 6);
+    returnvalue::makeCode(CFDP_CLASS_ID, 7);
 static constexpr ReturnValue_t FILESTORE_REQUIRES_SECOND_FILE =
     returnvalue::makeCode(CFDP_CLASS_ID, 8);
 //! Can not parse filestore response because user did not pass a valid instance
 //! or remaining size is invalid
 static constexpr ReturnValue_t FILESTORE_RESPONSE_CANT_PARSE_FS_MESSAGE =
     returnvalue::makeCode(CFDP_CLASS_ID, 9);
+static constexpr ReturnValue_t INVALID_PDU_FORMAT = returnvalue::makeCode(CFDP_CLASS_ID, 10);
 
 //! Checksum types according to the SANA Checksum Types registry
 //! https://sanaregistry.org/r/checksum_identifiers/
@@ -45,17 +50,17 @@ enum ChecksumType {
   NULL_CHECKSUM = 15
 };
 
-enum PduType : bool { FILE_DIRECTIVE = 0, FILE_DATA = 1 };
+enum PduType : uint8_t { FILE_DIRECTIVE = 0, FILE_DATA = 1 };
 
-enum TransmissionModes : bool { ACKNOWLEDGED = 0, UNACKNOWLEDGED = 1 };
+enum TransmissionMode : uint8_t { ACKNOWLEDGED = 0, UNACKNOWLEDGED = 1 };
 
-enum SegmentMetadataFlag : bool { NOT_PRESENT = 0, PRESENT = 1 };
+enum SegmentMetadataFlag : bool { NOT_PRESENT = false, PRESENT = true };
 
-enum Direction : bool { TOWARDS_RECEIVER = 0, TOWARDS_SENDER = 1 };
+enum Direction : uint8_t { TOWARDS_RECEIVER = 0, TOWARDS_SENDER = 1 };
 
 enum SegmentationControl : bool {
-  NO_RECORD_BOUNDARIES_PRESERVATION = 0,
+  NO_RECORD_BOUNDARIES_PRESERVATION = false,
-  RECORD_BOUNDARIES_PRESERVATION = 1
+  RECORD_BOUNDARIES_PRESERVATION = true
 };
 
 enum WidthInBytes : uint8_t {
@@ -65,8 +70,9 @@ enum WidthInBytes : uint8_t {
   FOUR_BYTES = 4,
 };
 
-enum FileDirectives : uint8_t {
+enum FileDirective : uint8_t {
   INVALID_DIRECTIVE = 0x0f,
+  // The _DIRECTIVE suffix is mandatory here because of some nameclash!
   EOF_DIRECTIVE = 0x04,
   FINISH = 0x05,
   ACK = 0x06,
@@ -93,6 +99,14 @@ enum ConditionCode : uint8_t {
   CANCEL_REQUEST_RECEIVED = 0b1111
 };
 
+enum FaultHandlerCode {
+  RESERVED = 0b0000,
+  NOTICE_OF_CANCELLATION = 0b0001,
+  NOTICE_OF_SUSPENSION = 0b0010,
+  IGNORE_ERROR = 0b0011,
+  ABANDON_TRANSACTION = 0b0100
+};
+
 enum AckTransactionStatus {
   UNDEFINED = 0b00,
   ACTIVE = 0b01,
@@ -100,18 +114,18 @@ enum AckTransactionStatus {
   UNRECOGNIZED = 0b11
 };
 
-enum FinishedDeliveryCode { DATA_COMPLETE = 0, DATA_INCOMPLETE = 1 };
+enum FileDeliveryCode { DATA_COMPLETE = 0, DATA_INCOMPLETE = 1 };
 
-enum FinishedFileStatus {
+enum FileDeliveryStatus {
   DISCARDED_DELIBERATELY = 0,
   DISCARDED_FILESTORE_REJECTION = 1,
   RETAINED_IN_FILESTORE = 2,
   FILE_STATUS_UNREPORTED = 3
 };
 
-enum PromptResponseRequired : bool { PROMPT_NAK = 0, PROMPT_KEEP_ALIVE = 1 };
+enum PromptResponseRequired : uint8_t { PROMPT_NAK = 0, PROMPT_KEEP_ALIVE = 1 };
 
-enum TlvTypes : uint8_t {
+enum TlvType : uint8_t {
   FILESTORE_REQUEST = 0x00,
   FILESTORE_RESPONSE = 0x01,
   MSG_TO_USER = 0x02,

src/fsfw/cfdp/handler/CMakeLists.txt

@@ -0,0 +1,2 @@
+target_sources(${LIB_FSFW_NAME} PRIVATE SourceHandler.cpp DestHandler.cpp
+                                        FaultHandlerBase.cpp UserBase.cpp CfdpHandler.cpp)

src/fsfw/cfdp/handler/CfdpHandler.cpp

@@ -0,0 +1,135 @@
+#include "CfdpHandler.h"
+
+#include "fsfw/cfdp/pdu/AckPduReader.h"
+#include "fsfw/cfdp/pdu/PduHeaderReader.h"
+#include "fsfw/globalfunctions/arrayprinter.h"
+#include "fsfw/ipc/QueueFactory.h"
+#include "fsfw/tmtcservices/TmTcMessage.h"
+
+using namespace returnvalue;
+using namespace cfdp;
+
+CfdpHandler::CfdpHandler(const FsfwHandlerParams& fsfwParams, const CfdpHandlerCfg& cfdpCfg)
+    : SystemObject(fsfwParams.objectId),
+      destHandler(
+          DestHandlerParams(LocalEntityCfg(cfdpCfg.id, cfdpCfg.indicCfg, cfdpCfg.faultHandler),
+                            cfdpCfg.userHandler, cfdpCfg.remoteCfgProvider, cfdpCfg.packetInfoList,
+                            cfdpCfg.lostSegmentsList),
+          FsfwParams(fsfwParams.packetDest, nullptr, this, fsfwParams.tcStore,
+                     fsfwParams.tmStore)) {
+  // TODO: Make queue params configurable, or better yet, expect it to be passed externally
+  msgQueue = QueueFactory::instance()->createMessageQueue();
+  destHandler.setMsgQueue(*msgQueue);
+}
+
+[[nodiscard]] const char* CfdpHandler::getName() const { return "CFDP Handler"; }
+
+[[nodiscard]] uint32_t CfdpHandler::getIdentifier() const {
+  return destHandler.getDestHandlerParams().cfg.localId.getValue();
+}
+
+[[nodiscard]] MessageQueueId_t CfdpHandler::getRequestQueue() const { return msgQueue->getId(); }
+
+ReturnValue_t CfdpHandler::initialize() {
+  ReturnValue_t result = destHandler.initialize();
+  if (result != OK) {
+    return result;
+  }
+  tcStore = destHandler.getTcStore();
+  tmStore = destHandler.getTmStore();
+
+  return SystemObject::initialize();
+}
+
+ReturnValue_t CfdpHandler::performOperation(uint8_t operationCode) {
+  // TODO: Receive TC packets and route them to source and dest handler, depending on which is
+  //       correct or more appropriate
+  ReturnValue_t status;
+  ReturnValue_t result = OK;
+  TmTcMessage tmtcMsg;
+  for (status = msgQueue->receiveMessage(&tmtcMsg); status == returnvalue::OK;
+       status = msgQueue->receiveMessage(&tmtcMsg)) {
+    result = handleCfdpPacket(tmtcMsg);
+    if (result != OK) {
+      status = result;
+    }
+  }
+  auto& fsmRes = destHandler.performStateMachine();
+  // TODO: Error handling?
+  while (fsmRes.callStatus == CallStatus::CALL_AGAIN) {
+    destHandler.performStateMachine();
+    // TODO: Error handling?
+  }
+  return status;
+}
+
+ReturnValue_t CfdpHandler::handleCfdpPacket(TmTcMessage& msg) {
+  auto accessorPair = tcStore->getData(msg.getStorageId());
+  if (accessorPair.first != OK) {
+    return accessorPair.first;
+  }
+  PduHeaderReader reader(accessorPair.second.data(), accessorPair.second.size());
+  ReturnValue_t result = reader.parseData();
+  if (result != returnvalue::OK) {
+    return INVALID_PDU_FORMAT;
+  }
+  // The CFDP distributor should have taken care of ensuring the destination ID is correct
+  PduType type = reader.getPduType();
+  // Only the destination handler can process these PDUs
+  if (type == PduType::FILE_DATA) {
+    // Disable auto-deletion of packet
+    accessorPair.second.release();
+    PacketInfo info(type, msg.getStorageId());
+    result = destHandler.passPacket(info);
+  } else {
+    // Route depending on PDU type and directive type if applicable. It retrieves directive type
+    // from the raw stream for better performance (with sanity and directive code check).
+    // The routing is based on section 4.5 of the CFDP standard which specifies the PDU forwarding
+    // procedure.
+
+    // PDU header only. Invalid supplied data. A directive packet should have a valid data field
+    // with at least one byte being the directive code
+    const uint8_t* pduDataField = reader.getPduDataField();
+    if (pduDataField == nullptr) {
+      return INVALID_PDU_FORMAT;
+    }
+    if (not FileDirectiveReader::checkFileDirective(pduDataField[0])) {
+      return INVALID_DIRECTIVE_FIELD;
+    }
+    auto directive = static_cast<FileDirective>(pduDataField[0]);
+
+    auto passToDestHandler = [&]() {
+      accessorPair.second.release();
+      PacketInfo info(type, msg.getStorageId(), directive);
+      result = destHandler.passPacket(info);
+    };
+    auto passToSourceHandler = [&]() {
+
+    };
+    if (directive == FileDirective::METADATA or directive == FileDirective::EOF_DIRECTIVE or
+        directive == FileDirective::PROMPT) {
+      // Section b) of 4.5.3: These PDUs should always be targeted towards the file receiver a.k.a.
+      // the destination handler
+      passToDestHandler();
+    } else if (directive == FileDirective::FINISH or directive == FileDirective::NAK or
+               directive == FileDirective::KEEP_ALIVE) {
+      // Section c) of 4.5.3: These PDUs should always be targeted towards the file sender a.k.a.
+      // the source handler
+      passToSourceHandler();
+    } else if (directive == FileDirective::ACK) {
+      // Section a): Recipient depends of the type of PDU that is being acknowledged. We can simply
+      // extract the PDU type from the raw stream. If it is an EOF PDU, this packet is passed to
+      // the source handler, for a Finished PDU, it is passed to the destination handler.
+      FileDirective ackedDirective;
+      if (not AckPduReader::checkAckedDirectiveField(pduDataField[1], ackedDirective)) {
+        return INVALID_ACK_DIRECTIVE_FIELDS;
+      }
+      if (ackedDirective == FileDirective::EOF_DIRECTIVE) {
+        passToSourceHandler();
+      } else if (ackedDirective == FileDirective::FINISH) {
+        passToDestHandler();
+      }
+    }
+  }
+  return result;
+}

src/fsfw/cfdp/handler/CfdpHandler.h

@@ -0,0 +1,65 @@
+#ifndef FSFW_EXAMPLE_HOSTED_CFDPHANDLER_H
+#define FSFW_EXAMPLE_HOSTED_CFDPHANDLER_H
+
+#include <utility>
+
+#include "fsfw/cfdp/handler/DestHandler.h"
+#include "fsfw/objectmanager/SystemObject.h"
+#include "fsfw/tasks/ExecutableObjectIF.h"
+#include "fsfw/tmtcservices/AcceptsTelecommandsIF.h"
+#include "fsfw/tmtcservices/TmTcMessage.h"
+
+struct FsfwHandlerParams {
+  FsfwHandlerParams(object_id_t objectId, HasFileSystemIF& vfs, AcceptsTelemetryIF& packetDest,
+                    StorageManagerIF& tcStore, StorageManagerIF& tmStore)
+      : objectId(objectId), vfs(vfs), packetDest(packetDest), tcStore(tcStore), tmStore(tmStore) {}
+  object_id_t objectId{};
+  HasFileSystemIF& vfs;
+  AcceptsTelemetryIF& packetDest;
+  StorageManagerIF& tcStore;
+  StorageManagerIF& tmStore;
+};
+
+struct CfdpHandlerCfg {
+  CfdpHandlerCfg(cfdp::EntityId localId, cfdp::IndicationCfg indicationCfg,
+                 cfdp::UserBase& userHandler, cfdp::FaultHandlerBase& userFaultHandler,
+                 cfdp::PacketInfoListBase& packetInfo, cfdp::LostSegmentsListBase& lostSegmentsList,
+                 cfdp::RemoteConfigTableIF& remoteCfgProvider)
+      : id(std::move(localId)),
+        indicCfg(indicationCfg),
+        packetInfoList(packetInfo),
+        lostSegmentsList(lostSegmentsList),
+        remoteCfgProvider(remoteCfgProvider),
+        userHandler(userHandler),
+        faultHandler(userFaultHandler) {}
+
+  cfdp::EntityId id;
+  cfdp::IndicationCfg indicCfg;
+  cfdp::PacketInfoListBase& packetInfoList;
+  cfdp::LostSegmentsListBase& lostSegmentsList;
+  cfdp::RemoteConfigTableIF& remoteCfgProvider;
+  cfdp::UserBase& userHandler;
+  cfdp::FaultHandlerBase& faultHandler;
+};
+
+class CfdpHandler : public SystemObject, public ExecutableObjectIF, public AcceptsTelecommandsIF {
+ public:
+  explicit CfdpHandler(const FsfwHandlerParams& fsfwParams, const CfdpHandlerCfg& cfdpCfg);
+
+  [[nodiscard]] const char* getName() const override;
+  [[nodiscard]] uint32_t getIdentifier() const override;
+  [[nodiscard]] MessageQueueId_t getRequestQueue() const override;
+
+  ReturnValue_t initialize() override;
+  ReturnValue_t performOperation(uint8_t operationCode) override;
+
+ private:
+  MessageQueueIF* msgQueue = nullptr;
+  cfdp::DestHandler destHandler;
+  StorageManagerIF* tcStore = nullptr;
+  StorageManagerIF* tmStore = nullptr;
+
+  ReturnValue_t handleCfdpPacket(TmTcMessage& msg);
+};
+
+#endif  // FSFW_EXAMPLE_HOSTED_CFDPHANDLER_H

src/fsfw/cfdp/handler/DestHandler.cpp

@@ -0,0 +1,480 @@
+#include "DestHandler.h"
+
+#include <etl/crc32.h>
+
+#include <utility>
+
+#include "fsfw/FSFW.h"
+#include "fsfw/cfdp/pdu/EofPduReader.h"
+#include "fsfw/cfdp/pdu/FileDataReader.h"
+#include "fsfw/cfdp/pdu/FinishedPduCreator.h"
+#include "fsfw/cfdp/pdu/PduHeaderReader.h"
+#include "fsfw/objectmanager.h"
+#include "fsfw/tmtcservices/TmTcMessage.h"
+
+using namespace returnvalue;
+
+cfdp::DestHandler::DestHandler(DestHandlerParams params, FsfwParams fsfwParams)
+    : tlvVec(params.maxTlvsInOnePdu),
+      userTlvVec(params.maxTlvsInOnePdu),
+      dp(std::move(params)),
+      fp(fsfwParams),
+      tp(params.maxFilenameLen) {
+  tp.pduConf.direction = cfdp::Direction::TOWARDS_SENDER;
+}
+
+const cfdp::DestHandler::FsmResult& cfdp::DestHandler::performStateMachine() {
+  ReturnValue_t result;
+  uint8_t errorIdx = 0;
+  fsmRes.resetOfIteration();
+  if (fsmRes.step == TransactionStep::IDLE) {
+    for (auto infoIter = dp.packetListRef.begin(); infoIter != dp.packetListRef.end();) {
+      if (infoIter->pduType == PduType::FILE_DIRECTIVE and
+          infoIter->directiveType == FileDirective::METADATA) {
+        result = handleMetadataPdu(*infoIter);
+        checkAndHandleError(result, errorIdx);
+        // Store data was deleted in PDU handler because a store guard is used
+        dp.packetListRef.erase(infoIter++);
+      } else {
+        infoIter++;
+      }
+    }
+    if (fsmRes.step == TransactionStep::IDLE) {
+      // To decrease the already high complexity of the software, all packets arriving before
+      // a metadata PDU are deleted.
+      for (auto infoIter = dp.packetListRef.begin(); infoIter != dp.packetListRef.end();) {
+        fp.tcStore->deleteData(infoIter->storeId);
+        infoIter++;
+      }
+      dp.packetListRef.clear();
+    }
+
+    if (fsmRes.step != TransactionStep::IDLE) {
+      fsmRes.callStatus = CallStatus::CALL_AGAIN;
+    }
+    return updateFsmRes(errorIdx);
+  }
+  if (fsmRes.state == CfdpStates::BUSY_CLASS_1_NACKED) {
+    if (fsmRes.step == TransactionStep::RECEIVING_FILE_DATA_PDUS) {
+      for (auto infoIter = dp.packetListRef.begin(); infoIter != dp.packetListRef.end();) {
+        if (infoIter->pduType == PduType::FILE_DATA) {
+          result = handleFileDataPdu(*infoIter);
+          checkAndHandleError(result, errorIdx);
+          // Store data was deleted in PDU handler because a store guard is used
+          dp.packetListRef.erase(infoIter++);
+        } else if (infoIter->pduType == PduType::FILE_DIRECTIVE and
+                   infoIter->directiveType == FileDirective::EOF_DIRECTIVE) {
+          // TODO: Support for check timer missing
+          result = handleEofPdu(*infoIter);
+          checkAndHandleError(result, errorIdx);
+          // Store data was deleted in PDU handler because a store guard is used
+          dp.packetListRef.erase(infoIter++);
+        } else {
+          infoIter++;
+        }
+      }
+    }
+    if (fsmRes.step == TransactionStep::TRANSFER_COMPLETION) {
+      result = handleTransferCompletion();
+      checkAndHandleError(result, errorIdx);
+    }
+    if (fsmRes.step == TransactionStep::SENDING_FINISHED_PDU) {
+      result = sendFinishedPdu();
+      checkAndHandleError(result, errorIdx);
+      finish();
+    }
+    return updateFsmRes(errorIdx);
+  }
+  if (fsmRes.state == CfdpStates::BUSY_CLASS_2_ACKED) {
+    // TODO: Will be implemented at a later stage
+#if FSFW_CPP_OSTREAM_ENABLED == 1
+    sif::warning << "CFDP state machine for acknowledged mode not implemented yet" << std::endl;
+#endif
+  }
+  return updateFsmRes(errorIdx);
+}
+
+ReturnValue_t cfdp::DestHandler::passPacket(PacketInfo packet) {
+  if (dp.packetListRef.full()) {
+    return FAILED;
+  }
+  dp.packetListRef.push_back(packet);
+  return OK;
+}
+
+ReturnValue_t cfdp::DestHandler::initialize() {
+  if (fp.tmStore == nullptr) {
+    fp.tmStore = ObjectManager::instance()->get<StorageManagerIF>(objects::TM_STORE);
+    if (fp.tmStore == nullptr) {
+      return FAILED;
+    }
+  }
+
+  if (fp.tcStore == nullptr) {
+    fp.tcStore = ObjectManager::instance()->get<StorageManagerIF>(objects::TC_STORE);
+    if (fp.tcStore == nullptr) {
+      return FAILED;
+    }
+  }
+
+  if (fp.msgQueue == nullptr) {
+    return FAILED;
+  }
+  return OK;
+}
+
+ReturnValue_t cfdp::DestHandler::handleMetadataPdu(const PacketInfo& info) {
+  // Process metadata PDU
+  auto constAccessorPair = fp.tcStore->getData(info.storeId);
+  if (constAccessorPair.first != OK) {
+    // TODO: This is not a CFDP error. Event and/or warning?
+    return constAccessorPair.first;
+  }
+  cfdp::StringLv sourceFileName;
+  cfdp::StringLv destFileName;
+  MetadataInfo metadataInfo(tp.fileSize, sourceFileName, destFileName);
+  cfdp::Tlv* tlvArrayAsPtr = tlvVec.data();
+  metadataInfo.setOptionsArray(&tlvArrayAsPtr, std::nullopt, tlvVec.size());
+  MetadataPduReader reader(constAccessorPair.second.data(), constAccessorPair.second.size(),
+                           metadataInfo);
+  ReturnValue_t result = reader.parseData();
+  // TODO: The standard does not really specify what happens if this kind of error happens
+  //       I think it might be a good idea to cache some sort of error code, which
+  //       is translated into a warning and/or event by an upper layer
+  if (result != OK) {
+    return handleMetadataParseError(result, constAccessorPair.second.data(),
+                                    constAccessorPair.second.size());
+  }
+  return startTransaction(reader, metadataInfo);
+}
+
+ReturnValue_t cfdp::DestHandler::handleFileDataPdu(const cfdp::PacketInfo& info) {
+  // Process file data PDU
+  auto constAccessorPair = fp.tcStore->getData(info.storeId);
+  if (constAccessorPair.first != OK) {
+    // TODO: This is not a CFDP error. Event and/or warning?
+    return constAccessorPair.first;
+  }
+  cfdp::FileSize offset;
+  FileDataInfo fdInfo(offset);
+  FileDataReader reader(constAccessorPair.second.data(), constAccessorPair.second.size(), fdInfo);
+  ReturnValue_t result = reader.parseData();
+  if (result != OK) {
+    return result;
+  }
+  size_t fileSegmentLen = 0;
+  const uint8_t* fileData = fdInfo.getFileData(&fileSegmentLen);
+  FileOpParams fileOpParams(tp.destName.data(), fileSegmentLen);
+  fileOpParams.offset = offset.value();
+  if (dp.cfg.indicCfg.fileSegmentRecvIndicRequired) {
+    FileSegmentRecvdParams segParams;
+    segParams.offset = offset.value();
+    segParams.id = tp.transactionId;
+    segParams.length = fileSegmentLen;
+    segParams.recContState = fdInfo.getRecordContinuationState();
+    size_t segmentMetadatLen = 0;
+    auto* segMetadata = fdInfo.getSegmentMetadata(&segmentMetadatLen);
+    segParams.segmentMetadata = {segMetadata, segmentMetadatLen};
+    dp.user.fileSegmentRecvdIndication(segParams);
+  }
+  result = dp.user.vfs.writeToFile(fileOpParams, fileData);
+  if (offset.value() + fileSegmentLen > tp.progress) {
+    tp.progress = offset.value() + fileSegmentLen;
+  }
+  if (result != returnvalue::OK) {
+    // TODO: Proper Error handling
+#if FSFW_CPP_OSTREAM_ENABLED == 1
+    sif::error << "File write error" << std::endl;
+#endif
+  } else {
+    tp.deliveryStatus = FileDeliveryStatus::RETAINED_IN_FILESTORE;
+  }
+  return result;
+}
+
+ReturnValue_t cfdp::DestHandler::handleEofPdu(const cfdp::PacketInfo& info) {
+  // Process EOF PDU
+  auto constAccessorPair = fp.tcStore->getData(info.storeId);
+  if (constAccessorPair.first != OK) {
+    // TODO: This is not a CFDP error. Event and/or warning?
+    return constAccessorPair.first;
+  }
+  EofInfo eofInfo(nullptr);
+  EofPduReader reader(constAccessorPair.second.data(), constAccessorPair.second.size(), eofInfo);
+  ReturnValue_t result = reader.parseData();
+  if (result != OK) {
+    return result;
+  }
+  // TODO: Error handling
+  if (eofInfo.getConditionCode() == ConditionCode::NO_ERROR) {
+    tp.crc = eofInfo.getChecksum();
+    uint64_t fileSizeFromEof = eofInfo.getFileSize().value();
+    // CFDP 4.6.1.2.9: Declare file size error if progress exceeds file size
+    if (fileSizeFromEof > tp.progress) {
+      // TODO: File size error
+    }
+    tp.fileSize.setFileSize(fileSizeFromEof, std::nullopt);
+  }
+  if (dp.cfg.indicCfg.eofRecvIndicRequired) {
+    dp.user.eofRecvIndication(getTransactionId());
+  }
+  if (fsmRes.step == TransactionStep::RECEIVING_FILE_DATA_PDUS) {
+    if (fsmRes.state == CfdpStates::BUSY_CLASS_1_NACKED) {
+      fsmRes.step = TransactionStep::TRANSFER_COMPLETION;
+    } else if (fsmRes.state == CfdpStates::BUSY_CLASS_2_ACKED) {
+      fsmRes.step = TransactionStep::SENDING_ACK_PDU;
+    }
+  }
+  return returnvalue::OK;
+}
+
+ReturnValue_t cfdp::DestHandler::handleMetadataParseError(ReturnValue_t result,
+                                                          const uint8_t* rawData, size_t maxSize) {
+  // TODO: try to extract destination ID for error
+  // TODO: Invalid metadata PDU.
+#if FSFW_CPP_OSTREAM_ENABLED == 1
+  sif::warning << "Parsing Metadata PDU failed with code " << result << std::endl;
+#else
+#endif
+  PduHeaderReader headerReader(rawData, maxSize);
+  result = headerReader.parseData();
+  if (result != OK) {
+    // TODO: Now this really should not happen. Warning or error,
+    //       yield or cache appropriate returnvalue
+#if FSFW_CPP_OSTREAM_ENABLED == 1
+    sif::warning << "Parsing Header failed" << std::endl;
+#else
+#endif
+    // TODO: Trigger appropriate event
+    return result;
+  }
+  cfdp::EntityId destId;
+  headerReader.getDestId(destId);
+  RemoteEntityCfg* remoteCfg;
+  if (not dp.remoteCfgTable.getRemoteCfg(destId, &remoteCfg)) {
+// TODO: No remote config for dest ID. I consider this a configuration error, which is not
+//       covered by the standard.
+//       Warning or error, yield or cache appropriate returnvalue
+#if FSFW_CPP_OSTREAM_ENABLED == 1
+    sif::warning << "No remote config exists for destination ID" << std::endl;
+#else
+#endif
+    // TODO: Trigger appropriate event
+  }
+  // TODO: Appropriate returnvalue?
+  return returnvalue::FAILED;
+}
+
+ReturnValue_t cfdp::DestHandler::startTransaction(MetadataPduReader& reader, MetadataInfo& info) {
+  if (fsmRes.state != CfdpStates::IDLE) {
+    // According to standard, discard metadata PDU if we are busy
+    return OK;
+  }
+  ReturnValue_t result = OK;
+  fsmRes.step = TransactionStep::TRANSACTION_START;
+  if (reader.getTransmissionMode() == TransmissionMode::UNACKNOWLEDGED) {
+    fsmRes.state = CfdpStates::BUSY_CLASS_1_NACKED;
+  } else if (reader.getTransmissionMode() == TransmissionMode::ACKNOWLEDGED) {
+    fsmRes.state = CfdpStates::BUSY_CLASS_2_ACKED;
+  }
+  tp.checksumType = info.getChecksumType();
+  tp.closureRequested = info.isClosureRequested();
+  size_t sourceNameSize = 0;
+  const uint8_t* sourceNamePtr = info.getSourceFileName().getValue(&sourceNameSize);
+  if (sourceNameSize > tp.sourceName.size()) {
+    // TODO: Warning, event etc.
+    return FAILED;
+  }
+  std::memcpy(tp.sourceName.data(), sourceNamePtr, sourceNameSize);
+  tp.sourceName[sourceNameSize] = '\0';
+  size_t destNameSize = 0;
+  const uint8_t* destNamePtr = info.getDestFileName().getValue(&destNameSize);
+  if (destNameSize > tp.destName.size()) {
+    // TODO: Warning, event etc.
+    return FAILED;
+  }
+  std::memcpy(tp.destName.data(), destNamePtr, destNameSize);
+  tp.destName[destNameSize] = '\0';
+  reader.fillConfig(tp.pduConf);
+  tp.pduConf.direction = Direction::TOWARDS_SENDER;
+  tp.transactionId.entityId = tp.pduConf.sourceId;
+  tp.transactionId.seqNum = tp.pduConf.seqNum;
+  if (not dp.remoteCfgTable.getRemoteCfg(tp.pduConf.sourceId, &tp.remoteCfg)) {
+    // TODO: Warning, event etc.
+#if FSFW_CPP_OSTREAM_ENABLED == 1
+    sif::warning << "cfdp::DestHandler" << __func__
+                 << ": No remote configuration found for destination ID "
+                 << tp.pduConf.sourceId.getValue() << std::endl;
+#endif
+    return FAILED;
+  }
+  // If both dest name size and source name size are 0, we are dealing with a metadata only PDU,
+  // so there is no need to create a file or truncate an existing file
+  if (destNameSize > 0 and sourceNameSize > 0) {
+    FilesystemParams fparams(tp.destName.data());
+    // TODO: Filesystem errors?
+    if (dp.user.vfs.fileExists(fparams)) {
+      dp.user.vfs.truncateFile(fparams);
+    } else {
+      result = dp.user.vfs.createFile(fparams);
+      if (result != OK) {
+        // TODO: Handle FS error. This is probably a case for the filestore rejection mechanism of
+        // CFDP.
+        //       In any case, it does not really make sense to continue here
+      }
+    }
+  }
+  fsmRes.step = TransactionStep::RECEIVING_FILE_DATA_PDUS;
+  MetadataRecvdParams params(tp.transactionId, tp.pduConf.sourceId);
+  params.fileSize = tp.fileSize.getSize();
+  params.destFileName = tp.destName.data();
+  params.sourceFileName = tp.sourceName.data();
+  params.msgsToUserArray = dynamic_cast<MessageToUserTlv*>(userTlvVec.data());
+  params.msgsToUserLen = info.getOptionsLen();
+  dp.user.metadataRecvdIndication(params);
+  return result;
+}
+
+cfdp::CfdpStates cfdp::DestHandler::getCfdpState() const { return fsmRes.state; }
+
+ReturnValue_t cfdp::DestHandler::handleTransferCompletion() {
+  ReturnValue_t result;
+  if (tp.checksumType != ChecksumType::NULL_CHECKSUM) {
+    result = checksumVerification();
+    if (result != OK) {
+      // TODO: Warning / error handling?
+    }
+  } else {
+    tp.conditionCode = ConditionCode::NO_ERROR;
+  }
+  result = noticeOfCompletion();
+  if (result != OK) {
+  }
+  if (fsmRes.state == CfdpStates::BUSY_CLASS_1_NACKED) {
+    if (tp.closureRequested) {
+      fsmRes.step = TransactionStep::SENDING_FINISHED_PDU;
+    } else {
+      finish();
+    }
+  } else if (fsmRes.state == CfdpStates::BUSY_CLASS_2_ACKED) {
+    fsmRes.step = TransactionStep::SENDING_FINISHED_PDU;
+  }
+  return OK;
+}
+
+void cfdp::DestHandler::finish() {
+  tp.reset();
+  dp.packetListRef.clear();
+  fsmRes.state = CfdpStates::IDLE;
+  fsmRes.step = TransactionStep::IDLE;
+}
+
+ReturnValue_t cfdp::DestHandler::checksumVerification() {
+  std::array<uint8_t, 1024> buf{};
+  // TODO: Checksum verification and notice of completion
+  etl::crc32 crcCalc;
+  uint64_t currentOffset = 0;
+  FileOpParams params(tp.destName.data(), tp.fileSize.value());
+  while (currentOffset < tp.fileSize.value()) {
+    uint64_t readLen;
+    if (currentOffset + buf.size() > tp.fileSize.value()) {
+      readLen = tp.fileSize.value() - currentOffset;
+    } else {
+      readLen = buf.size();
+    }
+    if (readLen > 0) {
+      params.offset = currentOffset;
+      params.size = readLen;
+      auto result = dp.user.vfs.readFromFile(params, buf.data(), buf.size());
+      if (result != OK) {
+        // TODO: I think this is a case for a filestore rejection, but it might sense to print
+        //       a warning or trigger an event because this should generally not happen
+        return FAILED;
+      }
+      crcCalc.add(buf.begin(), buf.begin() + readLen);
+    }
+    currentOffset += readLen;
+  }
+
+  uint32_t value = crcCalc.value();
+  if (value == tp.crc) {
+    tp.conditionCode = ConditionCode::NO_ERROR;
+    tp.deliveryCode = FileDeliveryCode::DATA_COMPLETE;
+  } else {
+    // TODO: Proper error handling
+#if FSFW_CPP_OSTREAM_ENABLED == 1
+    sif::warning << "CRC check for file " << tp.destName.data() << " failed" << std::endl;
+#endif
+    tp.conditionCode = ConditionCode::FILE_CHECKSUM_FAILURE;
+  }
+  return OK;
+}
+
+ReturnValue_t cfdp::DestHandler::noticeOfCompletion() {
+  if (dp.cfg.indicCfg.transactionFinishedIndicRequired) {
+    TransactionFinishedParams params(tp.transactionId, tp.conditionCode, tp.deliveryCode,
+                                     tp.deliveryStatus);
+    dp.user.transactionFinishedIndication(params);
+  }
+  return OK;
+}
+
+ReturnValue_t cfdp::DestHandler::sendFinishedPdu() {
+  FinishedInfo info(tp.conditionCode, tp.deliveryCode, tp.deliveryStatus);
+  FinishPduCreator finishedPdu(tp.pduConf, info);
+  store_address_t storeId;
+  uint8_t* dataPtr = nullptr;
+  ReturnValue_t result =
+      fp.tcStore->getFreeElement(&storeId, finishedPdu.getSerializedSize(), &dataPtr);
+  if (result != OK) {
+    // TODO: Error handling and event, this is a non CFDP specific error (most likely store is full)
+    return result;
+  }
+  size_t serLen = 0;
+  result = finishedPdu.serialize(dataPtr, serLen, finishedPdu.getSerializedSize());
+  if (result != OK) {
+    // TODO: Error printout, this really should not happen
+    return result;
+  }
+  TmTcMessage msg(storeId);
+  result = fp.msgQueue->sendMessage(fp.packetDest.getReportReceptionQueue(), &msg);
+  if (result != OK) {
+    // TODO: Error handling and event, this is a non CFDP specific error (most likely store is full)
+    return result;
+  }
+  fsmRes.packetsSent++;
+  return OK;
+}
+
+cfdp::DestHandler::TransactionStep cfdp::DestHandler::getTransactionStep() const {
+  return fsmRes.step;
+}
+
+const cfdp::DestHandler::FsmResult& cfdp::DestHandler::updateFsmRes(uint8_t errors) {
+  fsmRes.errors = errors;
+  fsmRes.result = OK;
+  if (fsmRes.errors > 0) {
+    fsmRes.result = FAILED;
+  }
+  return fsmRes;
+}
+
+const cfdp::TransactionId& cfdp::DestHandler::getTransactionId() const { return tp.transactionId; }
+
+void cfdp::DestHandler::checkAndHandleError(ReturnValue_t result, uint8_t& errorIdx) {
+  if (result != OK and errorIdx < 3) {
+    fsmRes.errorCodes[errorIdx] = result;
+    errorIdx++;
+  }
+}
+
+void cfdp::DestHandler::setMsgQueue(MessageQueueIF& queue) { fp.msgQueue = &queue; }
+
+void cfdp::DestHandler::setEventReporter(EventReportingProxyIF& reporter) {
+  fp.eventReporter = &reporter;
+}
+
+const cfdp::DestHandlerParams& cfdp::DestHandler::getDestHandlerParams() const { return dp; }
+
+StorageManagerIF* cfdp::DestHandler::getTmStore() const { return fp.tmStore; }
+StorageManagerIF* cfdp::DestHandler::getTcStore() const { return fp.tcStore; }

src/fsfw/cfdp/handler/DestHandler.h

@@ -0,0 +1,202 @@
+#ifndef FSFW_CFDP_CFDPDESTHANDLER_H
+#define FSFW_CFDP_CFDPDESTHANDLER_H
+
+#include <etl/list.h>
+#include <etl/set.h>
+
+#include <optional>
+#include <utility>
+
+#include "RemoteConfigTableIF.h"
+#include "UserBase.h"
+#include "defs.h"
+#include "fsfw/cfdp/handler/mib.h"
+#include "fsfw/cfdp/pdu/MetadataPduReader.h"
+#include "fsfw/cfdp/pdu/PduConfig.h"
+#include "fsfw/container/DynamicFIFO.h"
+#include "fsfw/storagemanager/StorageManagerIF.h"
+#include "fsfw/storagemanager/storeAddress.h"
+#include "fsfw/tmtcservices/AcceptsTelemetryIF.h"
+
+namespace cfdp {
+
+struct PacketInfo {
+  PacketInfo(PduType type, store_address_t storeId,
+             std::optional<FileDirective> directive = std::nullopt)
+      : pduType(type), directiveType(directive), storeId(storeId) {}
+
+  PduType pduType = PduType::FILE_DATA;
+  std::optional<FileDirective> directiveType = FileDirective::INVALID_DIRECTIVE;
+  store_address_t storeId = store_address_t::invalid();
+  PacketInfo() = default;
+};
+
+template <size_t SIZE>
+using LostSegmentsList = etl::set<etl::pair<uint64_t, uint64_t>, SIZE>;
+template <size_t SIZE>
+using PacketInfoList = etl::list<PacketInfo, SIZE>;
+using LostSegmentsListBase = etl::iset<etl::pair<uint64_t, uint64_t>>;
+using PacketInfoListBase = etl::ilist<PacketInfo>;
+
+struct DestHandlerParams {
+  DestHandlerParams(LocalEntityCfg cfg, UserBase& user, RemoteConfigTableIF& remoteCfgTable,
+                    PacketInfoListBase& packetList,
+                    // TODO: This container can potentially take tons of space. For a better
+                    //       memory efficient implementation, an additional abstraction could be
+                    //       be used so users can use uint32_t as the pair type
+                    LostSegmentsListBase& lostSegmentsContainer)
+      : cfg(std::move(cfg)),
+        user(user),
+        remoteCfgTable(remoteCfgTable),
+        packetListRef(packetList),
+        lostSegmentsContainer(lostSegmentsContainer) {}
+
+  LocalEntityCfg cfg;
+  UserBase& user;
+  RemoteConfigTableIF& remoteCfgTable;
+
+  PacketInfoListBase& packetListRef;
+  LostSegmentsListBase& lostSegmentsContainer;
+  uint8_t maxTlvsInOnePdu = 10;
+  size_t maxFilenameLen = 255;
+};
+
+struct FsfwParams {
+  FsfwParams(AcceptsTelemetryIF& packetDest, MessageQueueIF* msgQueue,
+             EventReportingProxyIF* eventReporter, StorageManagerIF& tcStore,
+             StorageManagerIF& tmStore)
+      : FsfwParams(packetDest, msgQueue, eventReporter) {
+    this->tcStore = &tcStore;
+    this->tmStore = &tmStore;
+  }
+
+  FsfwParams(AcceptsTelemetryIF& packetDest, MessageQueueIF* msgQueue,
+             EventReportingProxyIF* eventReporter)
+      : packetDest(packetDest), msgQueue(msgQueue), eventReporter(eventReporter) {}
+  AcceptsTelemetryIF& packetDest;
+  MessageQueueIF* msgQueue;
+  EventReportingProxyIF* eventReporter = nullptr;
+  StorageManagerIF* tcStore = nullptr;
+  StorageManagerIF* tmStore = nullptr;
+};
+
+enum class CallStatus { DONE, CALL_AFTER_DELAY, CALL_AGAIN };
+
+class DestHandler {
+ public:
+  enum class TransactionStep {
+    IDLE = 0,
+    TRANSACTION_START = 1,
+    RECEIVING_FILE_DATA_PDUS = 2,
+    SENDING_ACK_PDU = 3,
+    TRANSFER_COMPLETION = 4,
+    SENDING_FINISHED_PDU = 5
+  };
+
+  struct FsmResult {
+   public:
+    ReturnValue_t result = returnvalue::OK;
+    CallStatus callStatus = CallStatus::CALL_AFTER_DELAY;
+    TransactionStep step = TransactionStep::IDLE;
+    CfdpStates state = CfdpStates::IDLE;
+    uint32_t packetsSent = 0;
+    uint8_t errors = 0;
+    std::array<ReturnValue_t, 3> errorCodes = {};
+    void resetOfIteration() {
+      result = returnvalue::OK;
+      callStatus = CallStatus::CALL_AFTER_DELAY;
+      packetsSent = 0;
+      errors = 0;
+      errorCodes.fill(returnvalue::OK);
+    }
+  };
+  /**
+   * Will be returned if it is advisable to call the state machine operation call again
+   */
+  ReturnValue_t PARTIAL_SUCCESS = returnvalue::makeCode(0, 2);
+  ReturnValue_t FAILURE = returnvalue::makeCode(0, 3);
+  explicit DestHandler(DestHandlerParams handlerParams, FsfwParams fsfwParams);
+
+  /**
+   *
+   * @return
+   *  - @c returnvalue::OK  State machine OK for this execution cycle
+   *  - @c CALL_FSM_AGAIN   State machine should be called again.
+   */
+  const FsmResult& performStateMachine();
+  void setMsgQueue(MessageQueueIF& queue);
+  void setEventReporter(EventReportingProxyIF& reporter);
+
+  ReturnValue_t passPacket(PacketInfo packet);
+
+  ReturnValue_t initialize();
+
+  [[nodiscard]] CfdpStates getCfdpState() const;
+  [[nodiscard]] TransactionStep getTransactionStep() const;
+  [[nodiscard]] const TransactionId& getTransactionId() const;
+  [[nodiscard]] const DestHandlerParams& getDestHandlerParams() const;
+  [[nodiscard]] StorageManagerIF* getTcStore() const;
+  [[nodiscard]] StorageManagerIF* getTmStore() const;
+
+ private:
+  struct TransactionParams {
+    // Initialize char vectors with length + 1 for 0 termination
+    explicit TransactionParams(size_t maxFileNameLen)
+        : sourceName(maxFileNameLen + 1), destName(maxFileNameLen + 1) {}
+
+    void reset() {
+      pduConf = PduConfig();
+      transactionId = TransactionId();
+      std::fill(sourceName.begin(), sourceName.end(), '\0');
+      std::fill(destName.begin(), destName.end(), '\0');
+      fileSize.setFileSize(0, false);
+      conditionCode = ConditionCode::NO_ERROR;
+      deliveryCode = FileDeliveryCode::DATA_INCOMPLETE;
+      deliveryStatus = FileDeliveryStatus::DISCARDED_DELIBERATELY;
+      crc = 0;
+      progress = 0;
+      remoteCfg = nullptr;
+      closureRequested = false;
+      checksumType = ChecksumType::NULL_CHECKSUM;
+    }
+
+    ChecksumType checksumType = ChecksumType::NULL_CHECKSUM;
+    bool closureRequested = false;
+    std::vector<char> sourceName;
+    std::vector<char> destName;
+    cfdp::FileSize fileSize;
+    TransactionId transactionId;
+    PduConfig pduConf;
+    ConditionCode conditionCode = ConditionCode::NO_ERROR;
+    FileDeliveryCode deliveryCode = FileDeliveryCode::DATA_INCOMPLETE;
+    FileDeliveryStatus deliveryStatus = FileDeliveryStatus::DISCARDED_DELIBERATELY;
+    uint32_t crc = 0;
+    uint64_t progress = 0;
+    RemoteEntityCfg* remoteCfg = nullptr;
+  };
+
+  std::vector<cfdp::Tlv> tlvVec;
+  std::vector<cfdp::Tlv> userTlvVec;
+  DestHandlerParams dp;
+  FsfwParams fp;
+  TransactionParams tp;
+  FsmResult fsmRes;
+
+  ReturnValue_t startTransaction(MetadataPduReader& reader, MetadataInfo& info);
+  ReturnValue_t handleMetadataPdu(const PacketInfo& info);
+  ReturnValue_t handleFileDataPdu(const PacketInfo& info);
+  ReturnValue_t handleEofPdu(const PacketInfo& info);
+  ReturnValue_t handleMetadataParseError(ReturnValue_t result, const uint8_t* rawData,
+                                         size_t maxSize);
+  ReturnValue_t handleTransferCompletion();
+  ReturnValue_t sendFinishedPdu();
+  ReturnValue_t noticeOfCompletion();
+  ReturnValue_t checksumVerification();
+  const FsmResult& updateFsmRes(uint8_t errors);
+  void checkAndHandleError(ReturnValue_t result, uint8_t& errorIdx);
+  void finish();
+};
+
+}  // namespace cfdp
+
+#endif  // FSFW_CFDP_CFDPDESTHANDLER_H

src/fsfw/cfdp/handler/FaultHandlerBase.cpp

@@ -0,0 +1,51 @@
+#include "FaultHandlerBase.h"
+
+namespace cfdp {
+
+FaultHandlerBase::FaultHandlerBase() = default;
+FaultHandlerBase::~FaultHandlerBase() = default;
+
+bool FaultHandlerBase::getFaultHandler(cfdp::ConditionCode code,
+                                       cfdp::FaultHandlerCode& handler) const {
+  auto iter = faultHandlerMap.find(code);
+  if (iter == faultHandlerMap.end()) {
+    return false;
+  }
+  handler = iter->second;
+  return true;
+}
+
+bool FaultHandlerBase::setFaultHandler(cfdp::ConditionCode code, cfdp::FaultHandlerCode handler) {
+  if (not faultHandlerMap.contains(code)) {
+    return false;
+  }
+  if (handler != FaultHandlerCode::NOTICE_OF_SUSPENSION and
+      handler != FaultHandlerCode::ABANDON_TRANSACTION and
+      handler != FaultHandlerCode::NOTICE_OF_CANCELLATION and
+      handler != FaultHandlerCode::IGNORE_ERROR) {
+    return false;
+  }
+  faultHandlerMap[code] = handler;
+  return true;
+}
+
+bool FaultHandlerBase::reportFault(cfdp::TransactionId& id, cfdp::ConditionCode code) {
+  if (not faultHandlerMap.contains(code)) {
+    return false;
+  }
+  cfdp::FaultHandlerCode fh = faultHandlerMap[code];
+  if (fh == cfdp::FaultHandlerCode::IGNORE_ERROR) {
+    ignoreCb(id, code);
+  } else if (fh == cfdp::FaultHandlerCode::ABANDON_TRANSACTION) {
+    abandonCb(id, code);
+  } else if (fh == cfdp::FaultHandlerCode::NOTICE_OF_CANCELLATION) {
+    noticeOfCancellationCb(id, code);
+  } else if (fh == cfdp::FaultHandlerCode::NOTICE_OF_SUSPENSION) {
+    noticeOfSuspensionCb(id, code);
+  } else {
+    // Should never happen, but use defensive programming
+    return false;
+  }
+  return true;
+}
+}  // namespace cfdp

src/fsfw/cfdp/handler/FaultHandlerBase.h

@@ -0,0 +1,77 @@
+#ifndef FSFW_CFDP_FAULTHANDLERBASE_H
+#define FSFW_CFDP_FAULTHANDLERBASE_H
+
+#include <etl/flat_map.h>
+
+#include "fsfw/cfdp/VarLenFields.h"
+#include "fsfw/cfdp/definitions.h"
+
+namespace cfdp {
+
+/**
+ * @brief Provides a way to implement the fault handling procedures as specified
+ * in chapter 4.8 of the CFDP standard.
+ *
+ * @details
+ * It is passed into the CFDP handlers as part of the local entity configuration and provides
+ * a way to specify custom user error handlers.
+ *
+ * It does so by mapping each applicable CFDP condition code to a fault handler which
+ * is denoted by the four @cfdp::FaultHandlerCodes. This code is used to dispatch
+ * to a user-provided callback function:
+ *
+ * 1. @FaultHandlerCodes::IGNORE_ERROR -> @ignore_cb
+ * 2. @FaultHandlerCodes::NOTICE_OF_CANCELLATION` -> @notice_of_cancellation_cb
+ * 3. @FaultHandlerCodes::NOTICE_OF_SUSPENSION` -> @notice_of_suspension_cb
+ * 4. @FaultHandlerCodes::ABANDON_TRANSACTION` -> @abandon_transaction_cb
+ *
+ * For each error reported by @reportError, the appropriate fault handler callback
+ * will be called. The user provides the callbacks by providing a custom class which implements
+ * these base class and all abstract fault handler callbacks.
+ */
+class FaultHandlerBase {
+ public:
+  virtual ~FaultHandlerBase();
+  FaultHandlerBase();
+
+  /**
+   * Get the fault handler code for the given condition code
+   * @param code
+   * @param handler [out] Will be set to the approrpiate handler for the condition code if
+   *    it is valid
+   * @return
+   *  - true if the condition code is valid
+   *  - false otherwise
+   */
+  bool getFaultHandler(cfdp::ConditionCode code, cfdp::FaultHandlerCode& handler) const;
+
+  bool setFaultHandler(cfdp::ConditionCode code, cfdp::FaultHandlerCode handler);
+
+  bool reportFault(cfdp::TransactionId& id, cfdp::ConditionCode code);
+
+  virtual void noticeOfSuspensionCb(cfdp::TransactionId& id, cfdp::ConditionCode code) = 0;
+  virtual void noticeOfCancellationCb(cfdp::TransactionId& id, cfdp::ConditionCode code) = 0;
+  virtual void abandonCb(cfdp::TransactionId& id, cfdp::ConditionCode code) = 0;
+  virtual void ignoreCb(cfdp::TransactionId& id, cfdp::ConditionCode code) = 0;
+
+ private:
+  etl::flat_map<cfdp::ConditionCode, cfdp::FaultHandlerCode, 10> faultHandlerMap = {
+      etl::pair{cfdp::ConditionCode::POSITIVE_ACK_LIMIT_REACHED,
+                cfdp::FaultHandlerCode::IGNORE_ERROR},
+      etl::pair{cfdp::ConditionCode::KEEP_ALIVE_LIMIT_REACHED,
+                cfdp::FaultHandlerCode::IGNORE_ERROR},
+      etl::pair{cfdp::ConditionCode::INVALID_TRANSMISSION_MODE,
+                cfdp::FaultHandlerCode::IGNORE_ERROR},
+      etl::pair{cfdp::ConditionCode::FILE_CHECKSUM_FAILURE, cfdp::FaultHandlerCode::IGNORE_ERROR},
+      etl::pair{cfdp::ConditionCode::FILE_SIZE_ERROR, cfdp::FaultHandlerCode::IGNORE_ERROR},
+      etl::pair{cfdp::ConditionCode::NAK_LIMIT_REACHED, cfdp::FaultHandlerCode::IGNORE_ERROR},
+      etl::pair{cfdp::ConditionCode::INACTIVITY_DETECTED, cfdp::FaultHandlerCode::IGNORE_ERROR},
+      etl::pair{cfdp::ConditionCode::UNSUPPORTED_CHECKSUM_TYPE,
+                cfdp::FaultHandlerCode::IGNORE_ERROR},
+      etl::pair{cfdp::ConditionCode::FILESTORE_REJECTION, cfdp::FaultHandlerCode::IGNORE_ERROR},
+      etl::pair{cfdp::ConditionCode::CHECK_LIMIT_REACHED, cfdp::FaultHandlerCode::IGNORE_ERROR}};
+};
+
+}  // namespace cfdp
+
+#endif  // FSFW_CFDP_FAULTHANDLERBASE_H

src/fsfw/cfdp/handler/RemoteConfigTableIF.h

@@ -0,0 +1,35 @@
+#ifndef FSFW_CFDP_HANDLER_REMOTECONFIGTABLEIF_H
+#define FSFW_CFDP_HANDLER_REMOTECONFIGTABLEIF_H
+
+#include "fsfw/cfdp/handler/mib.h"
+
+namespace cfdp {
+
+class RemoteConfigTableIF {
+ public:
+  virtual ~RemoteConfigTableIF() = default;
+  virtual bool getRemoteCfg(const cfdp::EntityId& remoteId, cfdp::RemoteEntityCfg** cfg) = 0;
+};
+
+/**
+ * Helper class for the common case that there is exactly one remote entity
+ */
+class OneRemoteConfigProvider : public RemoteConfigTableIF {
+ public:
+  explicit OneRemoteConfigProvider(RemoteEntityCfg cfg) : cfg(std::move(cfg)) {}
+
+  bool getRemoteCfg(const EntityId& remoteId, cfdp::RemoteEntityCfg** cfg_) override {
+    if (remoteId != cfg.remoteId) {
+      return false;
+    }
+    *cfg_ = &cfg;
+    return true;
+  }
+
+ private:
+  RemoteEntityCfg cfg;
+};
+
+}  // namespace cfdp
+
+#endif  // FSFW_CFDP_HANDLER_REMOTECONFIGTABLEIF_H

src/fsfw/cfdp/handler/SourceHandler.cpp

@@ -0,0 +1 @@
+#include "SourceHandler.h"

src/fsfw/cfdp/handler/SourceHandler.h

@@ -0,0 +1,6 @@
+#ifndef FSFW_CFDP_CFDPSOURCEHANDLER_H
+#define FSFW_CFDP_CFDPSOURCEHANDLER_H
+
+class SourceHandler {};
+
+#endif  // FSFW_CFDP_CFDPSOURCEHANDLER_H

src/fsfw/cfdp/handler/StatusReportIF.h

@@ -0,0 +1,12 @@
+#ifndef FSFW_CFDP_HANDLER_STATUSREPORTIF_H
+#define FSFW_CFDP_HANDLER_STATUSREPORTIF_H
+
+namespace cfdp {
+
+class StatusReportIF {
+  virtual ~StatusReportIF() = default;
+};
+
+}  // namespace cfdp
+
+#endif  // FSFW_CFDP_HANDLER_STATUSREPORTIF_H

src/fsfw/cfdp/handler/UserBase.cpp

@@ -0,0 +1,3 @@
+#include "UserBase.h"
+
+cfdp::UserBase::UserBase(HasFileSystemIF& vfs) : vfs(vfs) {}

src/fsfw/cfdp/handler/UserBase.h

@@ -0,0 +1,101 @@
+#ifndef FSFW_CFDP_USERBASE_H
+#define FSFW_CFDP_USERBASE_H
+
+#include <optional>
+#include <utility>
+#include <vector>
+
+#include "StatusReportIF.h"
+#include "fsfw/cfdp/VarLenFields.h"
+#include "fsfw/cfdp/tlv/FilestoreResponseTlv.h"
+#include "fsfw/cfdp/tlv/MessageToUserTlv.h"
+#include "fsfw/filesystem/HasFileSystemIF.h"
+
+namespace cfdp {
+
+struct TransactionFinishedParams {
+  TransactionFinishedParams(const TransactionId& id, ConditionCode code, FileDeliveryCode delivCode,
+                            FileDeliveryStatus status)
+      : id(id), condCode(code), status(status), deliveryCode(delivCode) {}
+
+  const TransactionId& id;
+  ConditionCode condCode;
+  FileDeliveryStatus status;
+  FileDeliveryCode deliveryCode;
+  std::vector<FilestoreResponseTlv*> fsResponses;
+  StatusReportIF* statusReport = nullptr;
+};
+
+struct MetadataRecvdParams {
+  MetadataRecvdParams(const TransactionId& id, const EntityId& sourceId)
+      : id(id), sourceId(sourceId) {}
+  const TransactionId& id;
+  const EntityId& sourceId;
+  uint64_t fileSize = 0;
+  const char* sourceFileName = "";
+  const char* destFileName = "";
+  size_t msgsToUserLen = 0;
+  const MessageToUserTlv* msgsToUserArray = nullptr;
+};
+
+struct FileSegmentRecvdParams {
+  TransactionId id;
+  size_t offset;
+  size_t length;
+  std::optional<RecordContinuationState> recContState = std::nullopt;
+  std::pair<const uint8_t*, size_t> segmentMetadata;
+};
+
+/**
+ * @brief Base class which provides a user interface to interact with CFDP handlers.
+ *
+ * @details
+ * This class is also used to pass the Virtual Filestore (VFS) Implementation to the CFDP
+ * handlers so the filestore operations can be mapped to the underlying filestore.
+ *
+ * It is used by implementing it in a child class and then passing it to the CFDP
+ * handler objects. The base class provides default implementation for the user indication
+ * primitives specified in the CFDP standard. The user can override these implementations
+ * to provide custom indication handlers.
+ *
+ * Please note that for all indication callbacks, the passed transaction ID reference will
+ * become invalid shortly after the function has been executed. If the transaction ID is to be
+ * cached or used, create an own copy of it.
+ * @param vfs Virtual Filestore Object. Will be used for all file operations
+ */
+class UserBase {
+  friend class DestHandler;
+
+ public:
+  explicit UserBase(HasFileSystemIF& vfs);
+
+  virtual void transactionIndication(const TransactionId& id) = 0;
+  virtual void eofSentIndication(const TransactionId& id) = 0;
+  virtual void transactionFinishedIndication(const TransactionFinishedParams& params) = 0;
+  /**
+   * Will be called if metadata was received.
+   *
+   * IMPORTANT: The passed struct contains the messages to the user in form of a raw C array.
+   * The TLVs in these arrays are zero-copy types, which means that they point to the raw data
+   * inside the metadata packet directly. The metadata packet will be deleted from the TC store
+   * shortly after it was processed. If some of the data is to be cached and/or used after the
+   * function call, it needs to be copied into another user-provided buffer.
+   * @param params
+   */
+  virtual void metadataRecvdIndication(const MetadataRecvdParams& params) = 0;
+  virtual void fileSegmentRecvdIndication(const FileSegmentRecvdParams& params) = 0;
+  virtual void reportIndication(const TransactionId& id, StatusReportIF& report) = 0;
+  virtual void suspendedIndication(const TransactionId& id, ConditionCode code) = 0;
+  virtual void resumedIndication(const TransactionId& id, size_t progress) = 0;
+  virtual void faultIndication(const TransactionId& id, ConditionCode code, size_t progress) = 0;
+  virtual void abandonedIndication(const TransactionId& id, ConditionCode code,
+                                   size_t progress) = 0;
+  virtual void eofRecvIndication(const TransactionId& id) = 0;
+
+ private:
+  HasFileSystemIF& vfs;
+};
+
+}  // namespace cfdp
+
+#endif  // FSFW_CFDP_USERBASE_H

src/fsfw/cfdp/handler/defs.h

@@ -0,0 +1,9 @@
+#ifndef FSFW_CFDP_HANDLER_DEFS_H
+#define FSFW_CFDP_HANDLER_DEFS_H
+
+namespace cfdp {
+
+enum class CfdpStates { IDLE, BUSY_CLASS_1_NACKED, BUSY_CLASS_2_ACKED, SUSPENDED };
+
+}
+#endif  // FSFW_CFDP_HANDLER_DEFS_H

src/fsfw/cfdp/handler/mib.h

@@ -0,0 +1,42 @@
+#ifndef FSFW_CFDP_MIB_H
+#define FSFW_CFDP_MIB_H
+
+#include <utility>
+
+#include "FaultHandlerBase.h"
+#include "fsfw/cfdp/pdu/PduConfig.h"
+
+namespace cfdp {
+
+struct IndicationCfg {
+  bool eofSentIndicRequired = true;
+  bool eofRecvIndicRequired = true;
+  bool fileSegmentRecvIndicRequired = true;
+  bool transactionFinishedIndicRequired = true;
+  bool suspendedIndicRequired = true;
+  bool resumedIndicRequired = true;
+};
+
+struct LocalEntityCfg {
+  LocalEntityCfg(EntityId localId, IndicationCfg indicationCfg, FaultHandlerBase& fhBase)
+      : localId(std::move(localId)), indicCfg(indicationCfg), fhBase(fhBase) {}
+
+  EntityId localId;
+  IndicationCfg indicCfg;
+  FaultHandlerBase& fhBase;
+};
+
+struct RemoteEntityCfg {
+  explicit RemoteEntityCfg(EntityId id) : remoteId(std::move(id)) {}
+  EntityId remoteId;
+  size_t maxFileSegmentLen = 2048;
+  bool closureRequested = false;
+  bool crcOnTransmission = false;
+  TransmissionMode defaultTransmissionMode = TransmissionMode::UNACKNOWLEDGED;
+  ChecksumType defaultChecksum = ChecksumType::NULL_CHECKSUM;
+  const uint8_t version = CFDP_VERSION_2;
+};
+
+}  // namespace cfdp
+
+#endif  // FSFW_CFDP_MIB_H

src/fsfw/cfdp/helpers.cpp

@@ -0,0 +1,50 @@
+#include "helpers.h"
+
+const char* COND_CODE_STRINGS[14] = {"Unknown",
+                                     "No Error",
+                                     "Positive ACK Limit Reached",
+                                     "Keep Alive Limit Reached",
+                                     "Invalid Transmission Mode",
+                                     "Filestore Rejection",
+                                     "File Checksum Failure",
+                                     "File Size Error",
+                                     "NAK limit reached",
+                                     "Inactivity Detected",
+                                     "Check Limit Reached",
+                                     "Unsupported Checksum Type",
+                                     "Suspend Request Received",
+                                     "Cancel Request Received"};
+
+const char* cfdp::getConditionCodeString(cfdp::ConditionCode code) {
+  switch (code) {
+    case NO_CONDITION_FIELD:
+      return COND_CODE_STRINGS[0];
+    case NO_ERROR:
+      return COND_CODE_STRINGS[1];
+    case POSITIVE_ACK_LIMIT_REACHED:
+      return COND_CODE_STRINGS[2];
+    case KEEP_ALIVE_LIMIT_REACHED:
+      return COND_CODE_STRINGS[3];
+    case INVALID_TRANSMISSION_MODE:
+      return COND_CODE_STRINGS[4];
+    case FILESTORE_REJECTION:
+      return COND_CODE_STRINGS[5];
+    case FILE_CHECKSUM_FAILURE:
+      return COND_CODE_STRINGS[6];
+    case FILE_SIZE_ERROR:
+      return COND_CODE_STRINGS[7];
+    case NAK_LIMIT_REACHED:
+      return COND_CODE_STRINGS[8];
+    case INACTIVITY_DETECTED:
+      return COND_CODE_STRINGS[9];
+    case CHECK_LIMIT_REACHED:
+      return COND_CODE_STRINGS[10];
+    case UNSUPPORTED_CHECKSUM_TYPE:
+      return COND_CODE_STRINGS[11];
+    case SUSPEND_REQUEST_RECEIVED:
+      return COND_CODE_STRINGS[12];
+    case CANCEL_REQUEST_RECEIVED:
+      return COND_CODE_STRINGS[13];
+  }
+  return "Unknown";
+}

src/fsfw/cfdp/helpers.h

@@ -0,0 +1,11 @@
+#ifndef FSFW_EXAMPLE_HOSTED_HELPER_H
+#define FSFW_EXAMPLE_HOSTED_HELPER_H
+
+#include "definitions.h"
+
+namespace cfdp {
+
+const char* getConditionCodeString(cfdp::ConditionCode code);
+
+}
+#endif  // FSFW_EXAMPLE_HOSTED_HELPER_H

src/fsfw/cfdp/pdu/AckInfo.cpp

@@ -1,12 +1,12 @@
 #include "AckInfo.h"
 
-AckInfo::AckInfo(cfdp::FileDirectives ackedDirective, cfdp::ConditionCode ackedConditionCode,
+AckInfo::AckInfo(cfdp::FileDirective ackedDirective, cfdp::ConditionCode ackedConditionCode,
                  cfdp::AckTransactionStatus transactionStatus, uint8_t directiveSubtypeCode)
     : ackedDirective(ackedDirective),
       ackedConditionCode(ackedConditionCode),
       transactionStatus(transactionStatus),
       directiveSubtypeCode(directiveSubtypeCode) {
-  if (ackedDirective == cfdp::FileDirectives::FINISH) {
+  if (ackedDirective == cfdp::FileDirective::FINISH) {
     this->directiveSubtypeCode = 0b0001;
   } else {
     this->directiveSubtypeCode = 0b0000;
@@ -17,16 +17,16 @@ cfdp::ConditionCode AckInfo::getAckedConditionCode() const { return ackedConditi
 
 void AckInfo::setAckedConditionCode(cfdp::ConditionCode ackedConditionCode) {
   this->ackedConditionCode = ackedConditionCode;
-  if (ackedDirective == cfdp::FileDirectives::FINISH) {
+  if (ackedDirective == cfdp::FileDirective::FINISH) {
     this->directiveSubtypeCode = 0b0001;
   } else {
     this->directiveSubtypeCode = 0b0000;
   }
 }
 
-cfdp::FileDirectives AckInfo::getAckedDirective() const { return ackedDirective; }
+cfdp::FileDirective AckInfo::getAckedDirective() const { return ackedDirective; }
 
-void AckInfo::setAckedDirective(cfdp::FileDirectives ackedDirective) {
+void AckInfo::setAckedDirective(cfdp::FileDirective ackedDirective) {
   this->ackedDirective = ackedDirective;
 }
 

src/fsfw/cfdp/pdu/AckInfo.h

@@ -6,14 +6,14 @@
 class AckInfo {
  public:
   AckInfo();
-  AckInfo(cfdp::FileDirectives ackedDirective, cfdp::ConditionCode ackedConditionCode,
+  AckInfo(cfdp::FileDirective ackedDirective, cfdp::ConditionCode ackedConditionCode,
           cfdp::AckTransactionStatus transactionStatus, uint8_t directiveSubtypeCode = 0);
 
   cfdp::ConditionCode getAckedConditionCode() const;
   void setAckedConditionCode(cfdp::ConditionCode ackedConditionCode);
 
-  cfdp::FileDirectives getAckedDirective() const;
+  cfdp::FileDirective getAckedDirective() const;
-  void setAckedDirective(cfdp::FileDirectives ackedDirective);
+  void setAckedDirective(cfdp::FileDirective ackedDirective);
 
   uint8_t getDirectiveSubtypeCode() const;
   void setDirectiveSubtypeCode(uint8_t directiveSubtypeCode);
@@ -22,7 +22,7 @@ class AckInfo {
   void setTransactionStatus(cfdp::AckTransactionStatus transactionStatus);
 
  private:
-  cfdp::FileDirectives ackedDirective = cfdp::FileDirectives::INVALID_DIRECTIVE;
+  cfdp::FileDirective ackedDirective = cfdp::FileDirective::INVALID_DIRECTIVE;
   cfdp::ConditionCode ackedConditionCode = cfdp::ConditionCode::NO_CONDITION_FIELD;
   cfdp::AckTransactionStatus transactionStatus = cfdp::AckTransactionStatus::UNDEFINED;
   uint8_t directiveSubtypeCode = 0;

src/fsfw/cfdp/pdu/AckPduCreator.cpp

@@ -0,0 +1,33 @@
+#include "AckPduCreator.h"
+
+AckPduCreator::AckPduCreator(AckInfo &ackInfo, PduConfig &pduConf)
+    : FileDirectiveCreator(pduConf, cfdp::FileDirective::ACK, 2), ackInfo(ackInfo) {}
+
+size_t AckPduCreator::getSerializedSize() const { return FileDirectiveCreator::getWholePduSize(); }
+
+ReturnValue_t AckPduCreator::serialize(uint8_t **buffer, size_t *size, size_t maxSize,
+                                       Endianness streamEndianness) const {
+  ReturnValue_t result = FileDirectiveCreator::serialize(buffer, size, maxSize, streamEndianness);
+  if (result != returnvalue::OK) {
+    return result;
+  }
+  cfdp::FileDirective ackedDirective = ackInfo.getAckedDirective();
+  uint8_t directiveSubtypeCode = ackInfo.getDirectiveSubtypeCode();
+  cfdp::ConditionCode ackedConditionCode = ackInfo.getAckedConditionCode();
+  cfdp::AckTransactionStatus transactionStatus = ackInfo.getTransactionStatus();
+  if (ackedDirective != cfdp::FileDirective::FINISH and
+      ackedDirective != cfdp::FileDirective::EOF_DIRECTIVE) {
+    // TODO: better returncode
+    return returnvalue::FAILED;
+  }
+  if (*size + 2 > maxSize) {
+    return SerializeIF::BUFFER_TOO_SHORT;
+  }
+  **buffer = ackedDirective << 4 | directiveSubtypeCode;
+  *buffer += 1;
+  *size += 1;
+  **buffer = ackedConditionCode << 4 | transactionStatus;
+  *buffer += 1;
+  *size += 1;
+  return returnvalue::OK;
+}

src/fsfw/cfdp/pdu/AckPduCreator.h

@@ -1,11 +1,11 @@
-#ifndef FSFW_SRC_FSFW_CFDP_PDU_ACKPDUSERIALIZER_H_
+#ifndef FSFW_CFDP_PDU_ACKPDUSERIALIZER_H_
-#define FSFW_SRC_FSFW_CFDP_PDU_ACKPDUSERIALIZER_H_
+#define FSFW_CFDP_PDU_ACKPDUSERIALIZER_H_
 
 #include "AckInfo.h"
-#include "FileDirectiveDeserializer.h"
+#include "FileDirectiveCreator.h"
-#include "FileDirectiveSerializer.h"
+#include "FileDirectiveReader.h"
 
-class AckPduSerializer : public FileDirectiveSerializer {
+class AckPduCreator : public FileDirectiveCreator {
  public:
   /**
    * @brief   Serializer to pack ACK PDUs
@@ -16,9 +16,9 @@ class AckPduSerializer : public FileDirectiveSerializer {
    * @param transactionStatus
    * @param pduConf
    */
-  AckPduSerializer(AckInfo& ackInfo, PduConfig& pduConf);
+  AckPduCreator(AckInfo& ackInfo, PduConfig& pduConf);
 
-  size_t getSerializedSize() const override;
+  [[nodiscard]] size_t getSerializedSize() const override;
 
   ReturnValue_t serialize(uint8_t** buffer, size_t* size, size_t maxSize,
                           Endianness streamEndianness) const override;
@@ -27,4 +27,4 @@ class AckPduSerializer : public FileDirectiveSerializer {
   AckInfo& ackInfo;
 };
 
-#endif /* FSFW_SRC_FSFW_CFDP_PDU_ACKPDUSERIALIZER_H_ */
+#endif /* FSFW_CFDP_PDU_ACKPDUSERIALIZER_H_ */

src/fsfw/cfdp/pdu/AckPduDeserializer.cpp

@@ -1,37 +0,0 @@
-#include "AckPduDeserializer.h"
-
-AckPduDeserializer::AckPduDeserializer(const uint8_t* pduBuf, size_t maxSize, AckInfo& info)
-    : FileDirectiveDeserializer(pduBuf, maxSize), info(info) {}
-
-ReturnValue_t AckPduDeserializer::parseData() {
-  ReturnValue_t result = FileDirectiveDeserializer::parseData();
-  if (result != returnvalue::OK) {
-    return result;
-  }
-  size_t currentIdx = FileDirectiveDeserializer::getHeaderSize();
-  if (currentIdx + 2 > this->maxSize) {
-    return SerializeIF::BUFFER_TOO_SHORT;
-  }
-  if (not checkAndSetCodes(rawPtr[currentIdx], rawPtr[currentIdx + 1])) {
-    return cfdp::INVALID_ACK_DIRECTIVE_FIELDS;
-  }
-  return returnvalue::OK;
-}
-
-bool AckPduDeserializer::checkAndSetCodes(uint8_t firstByte, uint8_t secondByte) {
-  uint8_t ackedDirective = static_cast<cfdp::FileDirectives>(firstByte >> 4);
-
-  if (ackedDirective != cfdp::FileDirectives::EOF_DIRECTIVE and
-      ackedDirective != cfdp::FileDirectives::FINISH) {
-    return false;
-  }
-  this->info.setAckedDirective(static_cast<cfdp::FileDirectives>(ackedDirective));
-  uint8_t directiveSubtypeCode = firstByte & 0x0f;
-  if (directiveSubtypeCode != 0b0000 and directiveSubtypeCode != 0b0001) {
-    return false;
-  }
-  this->info.setDirectiveSubtypeCode(directiveSubtypeCode);
-  this->info.setAckedConditionCode(static_cast<cfdp::ConditionCode>(secondByte >> 4));
-  this->info.setTransactionStatus(static_cast<cfdp::AckTransactionStatus>(secondByte & 0x0f));
-  return true;
-}

src/fsfw/cfdp/pdu/AckPduReader.cpp

@@ -0,0 +1,45 @@
+#include "AckPduReader.h"
+
+AckPduReader::AckPduReader(const uint8_t* pduBuf, size_t maxSize, AckInfo& info)
+    : FileDirectiveReader(pduBuf, maxSize), info(info) {}
+
+ReturnValue_t AckPduReader::parseData() {
+  ReturnValue_t result = FileDirectiveReader::parseData();
+  if (result != returnvalue::OK) {
+    return result;
+  }
+  size_t currentIdx = FileDirectiveReader::getHeaderSize();
+  if (currentIdx + 2 > this->maxSize) {
+    return SerializeIF::BUFFER_TOO_SHORT;
+  }
+  if (not checkAndSetCodes(pointers.rawPtr[currentIdx], pointers.rawPtr[currentIdx + 1])) {
+    return cfdp::INVALID_ACK_DIRECTIVE_FIELDS;
+  }
+  return returnvalue::OK;
+}
+
+bool AckPduReader::checkAndSetCodes(uint8_t firstByte, uint8_t secondByte) {
+  cfdp::FileDirective directive;
+  if (not checkAckedDirectiveField(firstByte, directive)) {
+    return false;
+  }
+  this->info.setAckedDirective(directive);
+  uint8_t directiveSubtypeCode = firstByte & 0x0f;
+  if (directiveSubtypeCode != 0b0000 and directiveSubtypeCode != 0b0001) {
+    return false;
+  }
+  this->info.setDirectiveSubtypeCode(directiveSubtypeCode);
+  this->info.setAckedConditionCode(static_cast<cfdp::ConditionCode>(secondByte >> 4));
+  this->info.setTransactionStatus(static_cast<cfdp::AckTransactionStatus>(secondByte & 0x0f));
+  return true;
+}
+bool AckPduReader::checkAckedDirectiveField(uint8_t firstPduDataByte,
+                                            cfdp::FileDirective& ackedDirective) {
+  uint8_t ackedDirectiveRaw = static_cast<cfdp::FileDirective>(firstPduDataByte >> 4);
+  if (ackedDirectiveRaw != cfdp::FileDirective::EOF_DIRECTIVE and
+      ackedDirectiveRaw != cfdp::FileDirective::FINISH) {
+    return false;
+  }
+  ackedDirective = (static_cast<cfdp::FileDirective>(ackedDirectiveRaw));
+  return true;
+}

src/fsfw/cfdp/pdu/AckPduReader.h

@@ -2,18 +2,21 @@
 #define FSFW_SRC_FSFW_CFDP_PDU_ACKPDUDESERIALIZER_H_
 
 #include "AckInfo.h"
-#include "fsfw/cfdp/pdu/FileDirectiveDeserializer.h"
+#include "fsfw/cfdp/pdu/FileDirectiveReader.h"
 
-class AckPduDeserializer : public FileDirectiveDeserializer {
+class AckPduReader : public FileDirectiveReader {
  public:
-  AckPduDeserializer(const uint8_t* pduBuf, size_t maxSize, AckInfo& info);
+  AckPduReader(const uint8_t* pduBuf, size_t maxSize, AckInfo& info);
 
   /**
    *
    * @return
    *  - cfdp::INVALID_DIRECTIVE_FIELDS: Invalid fields
    */
-  ReturnValue_t parseData();
+  ReturnValue_t parseData() override;
+
+  static bool checkAckedDirectiveField(uint8_t firstPduDataByte,
+                                       cfdp::FileDirective& ackedDirective);
 
  private:
   bool checkAndSetCodes(uint8_t rawAckedByte, uint8_t rawAckedConditionCode);

src/fsfw/cfdp/pdu/AckPduSerializer.cpp

@@ -1,36 +0,0 @@
-#include "AckPduSerializer.h"
-
-AckPduSerializer::AckPduSerializer(AckInfo &ackInfo, PduConfig &pduConf)
-    : FileDirectiveSerializer(pduConf, cfdp::FileDirectives::ACK, 2), ackInfo(ackInfo) {}
-
-size_t AckPduSerializer::getSerializedSize() const {
-  return FileDirectiveSerializer::getWholePduSize();
-}
-
-ReturnValue_t AckPduSerializer::serialize(uint8_t **buffer, size_t *size, size_t maxSize,
-                                          Endianness streamEndianness) const {
-  ReturnValue_t result =
-      FileDirectiveSerializer::serialize(buffer, size, maxSize, streamEndianness);
-  if (result != returnvalue::OK) {
-    return result;
-  }
-  cfdp::FileDirectives ackedDirective = ackInfo.getAckedDirective();
-  uint8_t directiveSubtypeCode = ackInfo.getDirectiveSubtypeCode();
-  cfdp::ConditionCode ackedConditionCode = ackInfo.getAckedConditionCode();
-  cfdp::AckTransactionStatus transactionStatus = ackInfo.getTransactionStatus();
-  if (ackedDirective != cfdp::FileDirectives::FINISH and
-      ackedDirective != cfdp::FileDirectives::EOF_DIRECTIVE) {
-    // TODO: better returncode
-    return returnvalue::FAILED;
-  }
-  if (*size + 2 > maxSize) {
-    return SerializeIF::BUFFER_TOO_SHORT;
-  }
-  **buffer = ackedDirective << 4 | directiveSubtypeCode;
-  *buffer += 1;
-  *size += 1;
-  **buffer = ackedConditionCode << 4 | transactionStatus;
-  *buffer += 1;
-  *size += 1;
-  return returnvalue::OK;
-}

src/fsfw/cfdp/pdu/CMakeLists.txt

@@ -1,30 +1,29 @@
 target_sources(
   ${LIB_FSFW_NAME}
   PRIVATE PduConfig.cpp
-          VarLenField.cpp
+          HeaderCreator.cpp
-          HeaderSerializer.cpp
+          HeaderReader.cpp
-          HeaderDeserializer.cpp
+          FileDirectiveReader.cpp
-          FileDirectiveDeserializer.cpp
+          FileDirectiveCreator.cpp
-          FileDirectiveSerializer.cpp
           AckInfo.cpp
-          AckPduSerializer.cpp
+          AckPduCreator.cpp
-          AckPduDeserializer.cpp
+          AckPduReader.cpp
           EofInfo.cpp
-          EofPduSerializer.cpp
+          EofPduCreator.cpp
-          EofPduDeserializer.cpp
+          EofPduReader.cpp
           NakInfo.cpp
-          NakPduSerializer.cpp
+          NakPduCreator.cpp
-          NakPduDeserializer.cpp
+          NakPduReader.cpp
           FinishedInfo.cpp
-          FinishedPduSerializer.cpp
+          FinishedPduCreator.cpp
-          FinishedPduDeserializer.cpp
+          FinishedPduReader.cpp
           MetadataInfo.cpp
-          MetadataPduSerializer.cpp
+          MetadataPduCreator.cpp
-          MetadataPduDeserializer.cpp
+          MetadataPduReader.cpp
-          KeepAlivePduSerializer.cpp
+          KeepAlivePduCreator.cpp
-          KeepAlivePduDeserializer.cpp
+          KeepAlivePduReader.cpp
-          PromptPduSerializer.cpp
+          PromptPduCreator.cpp
-          PromptPduDeserializer.cpp
+          PromptPduReader.cpp
-          FileDataSerializer.cpp
+          FileDataCreator.cpp
-          FileDataDeserializer.cpp
+          FileDataReader.cpp
           FileDataInfo.cpp)

src/fsfw/cfdp/pdu/EofInfo.h

@@ -7,16 +7,16 @@
 
 struct EofInfo {
  public:
-  EofInfo(EntityIdTlv* faultLoc = nullptr);
+  explicit EofInfo(EntityIdTlv* faultLoc = nullptr);
   EofInfo(cfdp::ConditionCode conditionCode, uint32_t checksum, cfdp::FileSize fileSize,
           EntityIdTlv* faultLoc = nullptr);
 
   size_t getSerializedSize(bool fssLarge = false);
 
-  uint32_t getChecksum() const;
+  [[nodiscard]] uint32_t getChecksum() const;
-  cfdp::ConditionCode getConditionCode() const;
+  [[nodiscard]] cfdp::ConditionCode getConditionCode() const;
 
-  EntityIdTlv* getFaultLoc() const;
+  [[nodiscard]] EntityIdTlv* getFaultLoc() const;
   cfdp::FileSize& getFileSize();
   void setChecksum(uint32_t checksum);
   void setConditionCode(cfdp::ConditionCode conditionCode);

src/fsfw/cfdp/pdu/EofPduCreator.cpp

@@ -1,21 +1,17 @@
-#include "EofPduSerializer.h"
+#include "EofPduCreator.h"
 
 #include "fsfw/FSFW.h"
-#include "fsfw/serviceinterface.h"
 
-EofPduSerializer::EofPduSerializer(PduConfig &conf, EofInfo &info)
+EofPduCreator::EofPduCreator(PduConfig &conf, EofInfo &info)
-    : FileDirectiveSerializer(conf, cfdp::FileDirectives::EOF_DIRECTIVE, 9), info(info) {
+    : FileDirectiveCreator(conf, cfdp::FileDirective::EOF_DIRECTIVE, 9), info(info) {
-  setDirectiveDataFieldLen(info.getSerializedSize(getLargeFileFlag()));
+  setDirectiveDataFieldLen(info.getSerializedSize(HeaderCreator::getLargeFileFlag()));
 }
 
-size_t EofPduSerializer::getSerializedSize() const {
+size_t EofPduCreator::getSerializedSize() const { return FileDirectiveCreator::getWholePduSize(); }
-  return FileDirectiveSerializer::getWholePduSize();
-}
 
-ReturnValue_t EofPduSerializer::serialize(uint8_t **buffer, size_t *size, size_t maxSize,
+ReturnValue_t EofPduCreator::serialize(uint8_t **buffer, size_t *size, size_t maxSize,
-                                          Endianness streamEndianness) const {
+                                       Endianness streamEndianness) const {
-  ReturnValue_t result =
+  ReturnValue_t result = FileDirectiveCreator::serialize(buffer, size, maxSize, streamEndianness);
-      FileDirectiveSerializer::serialize(buffer, size, maxSize, streamEndianness);
   if (result != returnvalue::OK) {
     return result;
   }

src/fsfw/cfdp/pdu/EofPduCreator.h

@@ -2,18 +2,20 @@
 #define FSFW_SRC_FSFW_CFDP_PDU_EOFPDUSERIALIZER_H_
 
 #include "EofInfo.h"
-#include "fsfw/cfdp/pdu/FileDirectiveSerializer.h"
+#include "fsfw/cfdp/pdu/FileDirectiveCreator.h"
 #include "fsfw/cfdp/tlv/EntityIdTlv.h"
 
-class EofPduSerializer : public FileDirectiveSerializer {
+class EofPduCreator : public FileDirectiveCreator {
  public:
-  EofPduSerializer(PduConfig& conf, EofInfo& info);
+  EofPduCreator(PduConfig& conf, EofInfo& info);
 
-  size_t getSerializedSize() const override;
+  [[nodiscard]] size_t getSerializedSize() const override;
 
   ReturnValue_t serialize(uint8_t** buffer, size_t* size, size_t maxSize,
                           Endianness streamEndianness) const override;
 
+  using FileDirectiveCreator::serialize;
+
  private:
   EofInfo& info;
 };

src/fsfw/cfdp/pdu/EofPduDeserializer.h

@@ -1,17 +0,0 @@
-#ifndef FSFW_SRC_FSFW_CFDP_PDU_EOFPDUDESERIALIZER_H_
-#define FSFW_SRC_FSFW_CFDP_PDU_EOFPDUDESERIALIZER_H_
-
-#include "EofInfo.h"
-#include "fsfw/cfdp/pdu/FileDirectiveDeserializer.h"
-
-class EofPduDeserializer : public FileDirectiveDeserializer {
- public:
-  EofPduDeserializer(const uint8_t* pduBuf, size_t maxSize, EofInfo& eofInfo);
-
-  virtual ReturnValue_t parseData() override;
-
- private:
-  EofInfo& info;
-};
-
-#endif /* FSFW_SRC_FSFW_CFDP_PDU_EOFPDUDESERIALIZER_H_ */

src/fsfw/cfdp/pdu/EofPduReader.cpp

@@ -1,23 +1,23 @@
-#include "EofPduDeserializer.h"
+#include "EofPduReader.h"
 
 #include "fsfw/FSFW.h"
 #include "fsfw/serviceinterface.h"
 
-EofPduDeserializer::EofPduDeserializer(const uint8_t* pduBuf, size_t maxSize, EofInfo& eofInfo)
+EofPduReader::EofPduReader(const uint8_t* pduBuf, size_t maxSize, EofInfo& eofInfo)
-    : FileDirectiveDeserializer(pduBuf, maxSize), info(eofInfo) {}
+    : FileDirectiveReader(pduBuf, maxSize), info(eofInfo) {}
 
-ReturnValue_t EofPduDeserializer::parseData() {
+ReturnValue_t EofPduReader::parseData() {
-  ReturnValue_t result = FileDirectiveDeserializer::parseData();
+  ReturnValue_t result = FileDirectiveReader::parseData();
   if (result != returnvalue::OK) {
     return result;
   }
 
-  const uint8_t* bufPtr = rawPtr;
+  const uint8_t* bufPtr = pointers.rawPtr;
   size_t expectedFileFieldLen = 4;
   if (this->getLargeFileFlag()) {
     expectedFileFieldLen = 8;
   }
-  size_t currentIdx = FileDirectiveDeserializer::getHeaderSize();
+  size_t currentIdx = FileDirectiveReader::getHeaderSize();
   size_t deserLen = maxSize;
   if (maxSize < currentIdx + 5 + expectedFileFieldLen) {
     return SerializeIF::STREAM_TOO_SHORT;

src/fsfw/cfdp/pdu/EofPduReader.h

@@ -0,0 +1,17 @@
+#ifndef FSFW_SRC_FSFW_CFDP_PDU_EOFPDUDESERIALIZER_H_
+#define FSFW_SRC_FSFW_CFDP_PDU_EOFPDUDESERIALIZER_H_
+
+#include "EofInfo.h"
+#include "fsfw/cfdp/pdu/FileDirectiveReader.h"
+
+class EofPduReader : public FileDirectiveReader {
+ public:
+  EofPduReader(const uint8_t* pduBuf, size_t maxSize, EofInfo& eofInfo);
+
+  ReturnValue_t parseData() override;
+
+ private:
+  EofInfo& info;
+};
+
+#endif /* FSFW_SRC_FSFW_CFDP_PDU_EOFPDUDESERIALIZER_H_ */

src/fsfw/cfdp/pdu/FileDataCreator.cpp

@@ -1,28 +1,31 @@
-#include "FileDataSerializer.h"
+#include "FileDataCreator.h"
 
 #include <cstring>
 
-FileDataSerializer::FileDataSerializer(PduConfig& conf, FileDataInfo& info)
+FileDataCreator::FileDataCreator(PduConfig& conf, FileDataInfo& info)
-    : HeaderSerializer(conf, cfdp::PduType::FILE_DATA, 0, info.getSegmentMetadataFlag()),
+    : HeaderCreator(conf, cfdp::PduType::FILE_DATA, 0, info.getSegmentMetadataFlag()), info(info) {
-      info(info) {
   update();
 }
 
-void FileDataSerializer::update() {
+void FileDataCreator::update() {
   this->setSegmentMetadataFlag(info.getSegmentMetadataFlag());
   this->setSegmentationControl(info.getSegmentationControl());
   setPduDataFieldLen(info.getSerializedSize(this->getLargeFileFlag()));
 }
 
-ReturnValue_t FileDataSerializer::serialize(uint8_t** buffer, size_t* size, size_t maxSize,
+ReturnValue_t FileDataCreator::serialize(uint8_t** buffer, size_t* size, size_t maxSize,
-                                            Endianness streamEndianness) const {
+                                         Endianness streamEndianness) const {
-  ReturnValue_t result = HeaderSerializer::serialize(buffer, size, maxSize, streamEndianness);
+  if (buffer == nullptr or size == nullptr) {
+    return returnvalue::FAILED;
+  }
+  if (*size + getSerializedSize() > maxSize) {
+    return SerializeIF::BUFFER_TOO_SHORT;
+  }
+  ReturnValue_t result = HeaderCreator::serialize(buffer, size, maxSize, streamEndianness);
   if (result != returnvalue::OK) {
     return result;
   }
-  if (*size + this->getSerializedSize() > maxSize) {
+
-    return SerializeIF::BUFFER_TOO_SHORT;
-  }
   const uint8_t* readOnlyPtr = nullptr;
   if (this->hasSegmentMetadataFlag()) {
     size_t segmentMetadataLen = info.getSegmentMetadataLen();
@@ -50,6 +53,6 @@ ReturnValue_t FileDataSerializer::serialize(uint8_t** buffer, size_t* size, size
   return returnvalue::OK;
 }
 
-size_t FileDataSerializer::getSerializedSize() const {
+size_t FileDataCreator::getSerializedSize() const {
-  return HeaderSerializer::getSerializedSize() + info.getSerializedSize(this->getLargeFileFlag());
+  return HeaderCreator::getSerializedSize() + info.getSerializedSize(this->getLargeFileFlag());
 }

src/fsfw/cfdp/pdu/FileDataCreator.h

@@ -0,0 +1,27 @@
+#ifndef FSFW_CFDP_PDU_FILEDATASERIALIZER_H_
+#define FSFW_CFDP_PDU_FILEDATASERIALIZER_H_
+
+#include "../definitions.h"
+#include "FileDataInfo.h"
+#include "HeaderCreator.h"
+
+class FileDataCreator : public HeaderCreator {
+ public:
+  FileDataCreator(PduConfig& conf, FileDataInfo& info);
+
+  void update();
+
+  ReturnValue_t serialize(uint8_t* buf, size_t& serLen, size_t maxSize) const {
+    return SerializeIF::serialize(buf, serLen, maxSize, SerializeIF::Endianness::NETWORK);
+  }
+
+  ReturnValue_t serialize(uint8_t** buffer, size_t* size, size_t maxSize,
+                          Endianness streamEndianness) const override;
+
+  [[nodiscard]] size_t getSerializedSize() const override;
+
+ private:
+  FileDataInfo& info;
+};
+
+#endif /* FSFW_CFDP_PDU_FILEDATASERIALIZER_H_ */

src/fsfw/cfdp/pdu/FileDataInfo.cpp

@@ -57,16 +57,16 @@ ReturnValue_t FileDataInfo::addSegmentMetadataInfo(cfdp::RecordContinuationState
   return returnvalue::OK;
 }
 
-const uint8_t *FileDataInfo::getFileData(size_t *fileSize) const {
+const uint8_t *FileDataInfo::getFileData(size_t *fileSize_) const {
-  if (fileSize != nullptr) {
+  if (fileSize_ != nullptr) {
-    *fileSize = this->fileSize;
+    *fileSize_ = this->fileSize;
   }
   return fileData;
 }
 
-const uint8_t *FileDataInfo::getSegmentMetadata(size_t *segmentMetadataLen) {
+const uint8_t *FileDataInfo::getSegmentMetadata(size_t *segmentMetadataLen_) {
-  if (segmentMetadataLen != nullptr) {
+  if (segmentMetadataLen_ != nullptr) {
-    *segmentMetadataLen = this->segmentMetadataLen;
+    *segmentMetadataLen_ = this->segmentMetadataLen;
   }
   return segmentMetadata;
 }

src/fsfw/cfdp/pdu/FileDataInfo.h

@@ -6,25 +6,25 @@
 
 class FileDataInfo {
  public:
-  FileDataInfo(cfdp::FileSize& offset);
+  explicit FileDataInfo(cfdp::FileSize& offset);
   FileDataInfo(cfdp::FileSize& offset, const uint8_t* fileData, size_t fileSize);
 
-  size_t getSerializedSize(bool largeFile = false) const;
+  [[nodiscard]] size_t getSerializedSize(bool largeFile = false) const;
 
   cfdp::FileSize& getOffset();
   const uint8_t* getFileData(size_t* fileSize = nullptr) const;
   void setFileData(const uint8_t* fileData, size_t fileSize);
 
-  cfdp::SegmentMetadataFlag getSegmentMetadataFlag() const;
+  [[nodiscard]] cfdp::SegmentMetadataFlag getSegmentMetadataFlag() const;
-  cfdp::SegmentationControl getSegmentationControl() const;
+  [[nodiscard]] cfdp::SegmentationControl getSegmentationControl() const;
-  cfdp::RecordContinuationState getRecordContinuationState() const;
+  [[nodiscard]] cfdp::RecordContinuationState getRecordContinuationState() const;
   void setRecordContinuationState(cfdp::RecordContinuationState recContState);
   void setSegmentationControl(cfdp::SegmentationControl segCtrl);
 
-  size_t getSegmentMetadataLen() const;
+  [[nodiscard]] size_t getSegmentMetadataLen() const;
   void setSegmentMetadataLen(size_t len);
   void setSegmentMetadata(const uint8_t* ptr);
-  bool hasSegmentMetadata() const;
+  [[nodiscard]] bool hasSegmentMetadata() const;
   void setSegmentMetadataFlag(bool enable);
   ReturnValue_t addSegmentMetadataInfo(cfdp::RecordContinuationState recContState,
                                        const uint8_t* segmentMetadata, size_t segmentMetadataLen);

src/fsfw/cfdp/pdu/FileDataReader.cpp

@@ -1,17 +1,16 @@
-#include "FileDataDeserializer.h"
+#include "FileDataReader.h"
 
-FileDataDeserializer::FileDataDeserializer(const uint8_t* pduBuf, size_t maxSize,
+FileDataReader::FileDataReader(const uint8_t* pduBuf, size_t maxSize, FileDataInfo& info)
-                                           FileDataInfo& info)
+    : PduHeaderReader(pduBuf, maxSize), info(info) {}
-    : HeaderDeserializer(pduBuf, maxSize), info(info) {}
 
-ReturnValue_t FileDataDeserializer::parseData() {
+ReturnValue_t FileDataReader::parseData() {
-  ReturnValue_t result = HeaderDeserializer::parseData();
+  ReturnValue_t result = PduHeaderReader::parseData();
   if (result != returnvalue::OK) {
     return result;
   }
-  size_t currentIdx = HeaderDeserializer::getHeaderSize();
+  size_t currentIdx = PduHeaderReader::getHeaderSize();
-  const uint8_t* buf = rawPtr + currentIdx;
+  const uint8_t* buf = pointers.rawPtr + currentIdx;
-  size_t remSize = HeaderDeserializer::getWholePduSize() - currentIdx;
+  size_t remSize = PduHeaderReader::getWholePduSize() - currentIdx;
   if (remSize < 1) {
     return SerializeIF::STREAM_TOO_SHORT;
   }
@@ -41,8 +40,8 @@ ReturnValue_t FileDataDeserializer::parseData() {
   return returnvalue::OK;
 }
 
-SerializeIF::Endianness FileDataDeserializer::getEndianness() const { return endianness; }
+SerializeIF::Endianness FileDataReader::getEndianness() const { return endianness; }
 
-void FileDataDeserializer::setEndianness(SerializeIF::Endianness endianness) {
+void FileDataReader::setEndianness(SerializeIF::Endianness endianness_) {
-  this->endianness = endianness;
+  endianness = endianness_;
 }

src/fsfw/cfdp/pdu/FileDataReader.h

@@ -3,14 +3,14 @@
 
 #include "../definitions.h"
 #include "FileDataInfo.h"
-#include "HeaderDeserializer.h"
+#include "PduHeaderReader.h"
 
-class FileDataDeserializer : public HeaderDeserializer {
+class FileDataReader : public PduHeaderReader {
  public:
-  FileDataDeserializer(const uint8_t* pduBuf, size_t maxSize, FileDataInfo& info);
+  FileDataReader(const uint8_t* pduBuf, size_t maxSize, FileDataInfo& info);
 
-  ReturnValue_t parseData();
+  ReturnValue_t parseData() override;
-  SerializeIF::Endianness getEndianness() const;
+  [[nodiscard]] SerializeIF::Endianness getEndianness() const;
   void setEndianness(SerializeIF::Endianness endianness = SerializeIF::Endianness::NETWORK);
 
  private:

src/fsfw/cfdp/pdu/FileDataSerializer.h

@@ -1,23 +0,0 @@
-#ifndef FSFW_SRC_FSFW_CFDP_PDU_FILEDATASERIALIZER_H_
-#define FSFW_SRC_FSFW_CFDP_PDU_FILEDATASERIALIZER_H_
-
-#include "../definitions.h"
-#include "FileDataInfo.h"
-#include "HeaderSerializer.h"
-
-class FileDataSerializer : public HeaderSerializer {
- public:
-  FileDataSerializer(PduConfig& conf, FileDataInfo& info);
-
-  void update();
-
-  ReturnValue_t serialize(uint8_t** buffer, size_t* size, size_t maxSize,
-                          Endianness streamEndianness) const override;
-
-  size_t getSerializedSize() const override;
-
- private:
-  FileDataInfo& info;
-};
-
-#endif /* FSFW_SRC_FSFW_CFDP_PDU_FILEDATADESERIALIZER_H_ */

src/fsfw/cfdp/pdu/FileDirectiveCreator.cpp

@@ -0,0 +1,39 @@
+#include "FileDirectiveCreator.h"
+
+FileDirectiveCreator::FileDirectiveCreator(PduConfig &pduConf, cfdp::FileDirective directiveCode,
+                                           size_t directiveParamFieldLen)
+    : HeaderCreator(pduConf, cfdp::PduType::FILE_DIRECTIVE, directiveParamFieldLen + 1),
+      directiveCode(directiveCode) {}
+
+size_t FileDirectiveCreator::getSerializedSize() const {
+  return HeaderCreator::getSerializedSize() + 1;
+}
+
+ReturnValue_t FileDirectiveCreator::serialize(uint8_t **buffer, size_t *size, size_t maxSize,
+                                              Endianness streamEndianness) const {
+  if (buffer == nullptr or size == nullptr) {
+    return returnvalue::FAILED;
+  }
+  if (FileDirectiveCreator::getWholePduSize() > maxSize) {
+    return BUFFER_TOO_SHORT;
+  }
+  ReturnValue_t result = HeaderCreator::serialize(buffer, size, maxSize, streamEndianness);
+  if (result != returnvalue::OK) {
+    return result;
+  }
+
+  if (*size >= maxSize) {
+    return BUFFER_TOO_SHORT;
+  }
+  **buffer = directiveCode;
+  *buffer += 1;
+  *size += 1;
+  return returnvalue::OK;
+}
+
+void FileDirectiveCreator::setDirectiveDataFieldLen(size_t len) {
+  // Set length of data field plus 1 byte for the directive octet
+  HeaderCreator::setPduDataFieldLen(len + 1);
+}
+
+cfdp::FileDirective FileDirectiveCreator::getDirectiveCode() const { return directiveCode; }

src/fsfw/cfdp/pdu/FileDirectiveCreator.h

@@ -0,0 +1,34 @@
+#ifndef FSFW_SRC_FSFW_CFDP_PDU_FILEDIRECTIVESERIALIZER_H_
+#define FSFW_SRC_FSFW_CFDP_PDU_FILEDIRECTIVESERIALIZER_H_
+
+#include "fsfw/cfdp/pdu/HeaderCreator.h"
+
+class FileDirectiveCreator : public HeaderCreator {
+ public:
+  FileDirectiveCreator(PduConfig& pduConf, cfdp::FileDirective directiveCode,
+                       size_t directiveParamFieldLen);
+
+  [[nodiscard]] cfdp::FileDirective getDirectiveCode() const;
+
+  /**
+   * This only returns the size of the PDU header + 1 for the directive code octet.
+   * Use FileDirectiveCreator::getWholePduSize to get the full packet length, assuming
+   * the length fields was set correctly
+   * @return
+   */
+  [[nodiscard]] size_t getSerializedSize() const override;
+
+  [[nodiscard]] ReturnValue_t serialize(uint8_t* buffer, size_t& serLen, size_t maxSize) const {
+    return SerializeIF::serialize(buffer, serLen, maxSize, SerializeIF::Endianness::NETWORK);
+  }
+
+  ReturnValue_t serialize(uint8_t** buffer, size_t* size, size_t maxSize,
+                          Endianness streamEndianness) const override;
+
+  void setDirectiveDataFieldLen(size_t len);
+
+ private:
+  cfdp::FileDirective directiveCode = cfdp::FileDirective::INVALID_DIRECTIVE;
+};
+
+#endif /* FSFW_SRC_FSFW_CFDP_PDU_FILEDIRECTIVESERIALIZER_H_ */

src/fsfw/cfdp/pdu/FileDirectiveDeserializer.cpp

@@ -1,49 +0,0 @@
-#include "FileDirectiveDeserializer.h"
-
-FileDirectiveDeserializer::FileDirectiveDeserializer(const uint8_t *pduBuf, size_t maxSize)
-    : HeaderDeserializer(pduBuf, maxSize) {}
-
-cfdp::FileDirectives FileDirectiveDeserializer::getFileDirective() const { return fileDirective; }
-
-ReturnValue_t FileDirectiveDeserializer::parseData() {
-  ReturnValue_t result = HeaderDeserializer::parseData();
-  if (result != returnvalue::OK) {
-    return result;
-  }
-  if (this->getPduDataFieldLen() < 1) {
-    return cfdp::INVALID_PDU_DATAFIELD_LEN;
-  }
-  if (FileDirectiveDeserializer::getWholePduSize() > maxSize) {
-    return SerializeIF::STREAM_TOO_SHORT;
-  }
-  size_t currentIdx = HeaderDeserializer::getHeaderSize();
-  if (not checkFileDirective(rawPtr[currentIdx])) {
-    return cfdp::INVALID_DIRECTIVE_FIELDS;
-  }
-  setFileDirective(static_cast<cfdp::FileDirectives>(rawPtr[currentIdx]));
-  return returnvalue::OK;
-}
-
-size_t FileDirectiveDeserializer::getHeaderSize() const {
-  // return size of header plus the directive byte
-  return HeaderDeserializer::getHeaderSize() + 1;
-}
-
-bool FileDirectiveDeserializer::checkFileDirective(uint8_t rawByte) {
-  if (rawByte < cfdp::FileDirectives::EOF_DIRECTIVE or
-      (rawByte > cfdp::FileDirectives::PROMPT and rawByte != cfdp::FileDirectives::KEEP_ALIVE)) {
-    // Invalid directive field. TODO: Custom returnvalue
-    return false;
-  }
-  return true;
-}
-
-void FileDirectiveDeserializer::setFileDirective(cfdp::FileDirectives fileDirective) {
-  this->fileDirective = fileDirective;
-}
-
-void FileDirectiveDeserializer::setEndianness(SerializeIF::Endianness endianness) {
-  this->endianness = endianness;
-}
-
-SerializeIF::Endianness FileDirectiveDeserializer::getEndianness() const { return endianness; }

src/fsfw/cfdp/pdu/FileDirectiveReader.cpp

@@ -0,0 +1,49 @@
+#include "FileDirectiveReader.h"
+
+FileDirectiveReader::FileDirectiveReader(const uint8_t *pduBuf, size_t maxSize)
+    : PduHeaderReader(pduBuf, maxSize) {}
+
+cfdp::FileDirective FileDirectiveReader::getFileDirective() const { return fileDirective; }
+
+ReturnValue_t FileDirectiveReader::parseData() {
+  ReturnValue_t result = PduHeaderReader::parseData();
+  if (result != returnvalue::OK) {
+    return result;
+  }
+  if (this->getPduDataFieldLen() < 1) {
+    return cfdp::INVALID_PDU_DATAFIELD_LEN;
+  }
+  if (FileDirectiveReader::getWholePduSize() > maxSize) {
+    return SerializeIF::STREAM_TOO_SHORT;
+  }
+  size_t currentIdx = PduHeaderReader::getHeaderSize();
+  if (not checkFileDirective(pointers.rawPtr[currentIdx])) {
+    return cfdp::INVALID_DIRECTIVE_FIELD;
+  }
+  setFileDirective(static_cast<cfdp::FileDirective>(pointers.rawPtr[currentIdx]));
+  return returnvalue::OK;
+}
+
+size_t FileDirectiveReader::getHeaderSize() const {
+  // return size of header plus the directive byte
+  return PduHeaderReader::getHeaderSize() + 1;
+}
+
+bool FileDirectiveReader::checkFileDirective(uint8_t rawByte) {
+  if (rawByte < cfdp::FileDirective::EOF_DIRECTIVE or
+      (rawByte > cfdp::FileDirective::PROMPT and rawByte != cfdp::FileDirective::KEEP_ALIVE)) {
+    // Invalid directive field
+    return false;
+  }
+  return true;
+}
+
+void FileDirectiveReader::setFileDirective(cfdp::FileDirective fileDirective_) {
+  fileDirective = fileDirective_;
+}
+
+void FileDirectiveReader::setEndianness(SerializeIF::Endianness endianness_) {
+  endianness = endianness_;
+}
+
+SerializeIF::Endianness FileDirectiveReader::getEndianness() const { return endianness; }

src/fsfw/cfdp/pdu/FileDirectiveReader.h

@@ -2,7 +2,7 @@
 #define FSFW_SRC_FSFW_CFDP_PDU_FILEDIRECTIVEDESERIALIZER_H_
 
 #include "../definitions.h"
-#include "fsfw/cfdp/pdu/HeaderDeserializer.h"
+#include "fsfw/cfdp/pdu/PduHeaderReader.h"
 
 /**
  * @brief   This class is used to deserialize a PDU file directive header from raw memory.
@@ -11,28 +11,27 @@
  * This is a zero-copy implementation and #parseData needs to be called to ensure the data is
  * valid.
  */
-class FileDirectiveDeserializer : public HeaderDeserializer {
+class FileDirectiveReader : public PduHeaderReader {
  public:
-  FileDirectiveDeserializer(const uint8_t* pduBuf, size_t maxSize);
+  FileDirectiveReader(const uint8_t* pduBuf, size_t maxSize);
 
   /**
    * This needs to be called before accessing the PDU fields to avoid segmentation faults.
    * @return
    */
-  virtual ReturnValue_t parseData();
+  ReturnValue_t parseData() override;
-  size_t getHeaderSize() const;
+  [[nodiscard]] size_t getHeaderSize() const override;
 
-  cfdp::FileDirectives getFileDirective() const;
+  [[nodiscard]] cfdp::FileDirective getFileDirective() const;
 
   void setEndianness(SerializeIF::Endianness endianness);
-  SerializeIF::Endianness getEndianness() const;
+  [[nodiscard]] SerializeIF::Endianness getEndianness() const;
+  static bool checkFileDirective(uint8_t rawByte);
 
  protected:
-  bool checkFileDirective(uint8_t rawByte);
-
  private:
-  void setFileDirective(cfdp::FileDirectives fileDirective);
+  void setFileDirective(cfdp::FileDirective fileDirective);
-  cfdp::FileDirectives fileDirective = cfdp::FileDirectives::INVALID_DIRECTIVE;
+  cfdp::FileDirective fileDirective = cfdp::FileDirective::INVALID_DIRECTIVE;
   SerializeIF::Endianness endianness = SerializeIF::Endianness::NETWORK;
 };
 

src/fsfw/cfdp/pdu/FileDirectiveSerializer.cpp

@@ -1,38 +0,0 @@
-#include "FileDirectiveSerializer.h"
-
-FileDirectiveSerializer::FileDirectiveSerializer(PduConfig &pduConf,
-                                                 cfdp::FileDirectives directiveCode,
-                                                 size_t directiveParamFieldLen)
-    : HeaderSerializer(pduConf, cfdp::PduType::FILE_DIRECTIVE, directiveParamFieldLen + 1),
-      directiveCode(directiveCode) {}
-
-size_t FileDirectiveSerializer::getSerializedSize() const {
-  return HeaderSerializer::getSerializedSize() + 1;
-}
-
-ReturnValue_t FileDirectiveSerializer::serialize(uint8_t **buffer, size_t *size, size_t maxSize,
-                                                 Endianness streamEndianness) const {
-  if (buffer == nullptr or size == nullptr) {
-    return returnvalue::FAILED;
-  }
-  if (FileDirectiveSerializer::getWholePduSize() > maxSize) {
-    return BUFFER_TOO_SHORT;
-  }
-  ReturnValue_t result = HeaderSerializer::serialize(buffer, size, maxSize, streamEndianness);
-  if (result != returnvalue::OK) {
-    return result;
-  }
-
-  if (*size >= maxSize) {
-    return BUFFER_TOO_SHORT;
-  }
-  **buffer = directiveCode;
-  *buffer += 1;
-  *size += 1;
-  return returnvalue::OK;
-}
-
-void FileDirectiveSerializer::setDirectiveDataFieldLen(size_t len) {
-  // Set length of data field plus 1 byte for the directive octet
-  HeaderSerializer::setPduDataFieldLen(len + 1);
-}

src/fsfw/cfdp/pdu/FileDirectiveSerializer.h

@@ -1,28 +0,0 @@
-#ifndef FSFW_SRC_FSFW_CFDP_PDU_FILEDIRECTIVESERIALIZER_H_
-#define FSFW_SRC_FSFW_CFDP_PDU_FILEDIRECTIVESERIALIZER_H_
-
-#include "fsfw/cfdp/pdu/HeaderSerializer.h"
-
-class FileDirectiveSerializer : public HeaderSerializer {
- public:
-  FileDirectiveSerializer(PduConfig& pduConf, cfdp::FileDirectives directiveCode,
-                          size_t directiveParamFieldLen);
-
-  /**
-   * This only returns the size of the PDU header + 1 for the directive code octet.
-   * Use FileDirectiveSerializer::getWholePduSize to get the full packet length, assuming
-   * the length fields was set correctly
-   * @return
-   */
-  size_t getSerializedSize() const override;
-
-  ReturnValue_t serialize(uint8_t** buffer, size_t* size, size_t maxSize,
-                          Endianness streamEndianness) const override;
-
-  void setDirectiveDataFieldLen(size_t len);
-
- private:
-  cfdp::FileDirectives directiveCode = cfdp::FileDirectives::INVALID_DIRECTIVE;
-};
-
-#endif /* FSFW_SRC_FSFW_CFDP_PDU_FILEDIRECTIVESERIALIZER_H_ */

src/fsfw/cfdp/pdu/FinishedInfo.cpp

@@ -2,9 +2,8 @@
 
 FinishedInfo::FinishedInfo() {}
 
-FinishedInfo::FinishedInfo(cfdp::ConditionCode conditionCode,
+FinishedInfo::FinishedInfo(cfdp::ConditionCode conditionCode, cfdp::FileDeliveryCode deliveryCode,
-                           cfdp::FinishedDeliveryCode deliveryCode,
+                           cfdp::FileDeliveryStatus fileStatus)
-                           cfdp::FinishedFileStatus fileStatus)
     : conditionCode(conditionCode), deliveryCode(deliveryCode), fileStatus(fileStatus) {}
 
 size_t FinishedInfo::getSerializedSize() const {
@@ -83,13 +82,13 @@ void FinishedInfo::setConditionCode(cfdp::ConditionCode conditionCode) {
   this->conditionCode = conditionCode;
 }
 
-cfdp::FinishedDeliveryCode FinishedInfo::getDeliveryCode() const { return deliveryCode; }
+cfdp::FileDeliveryCode FinishedInfo::getDeliveryCode() const { return deliveryCode; }
 
-void FinishedInfo::setDeliveryCode(cfdp::FinishedDeliveryCode deliveryCode) {
+void FinishedInfo::setDeliveryCode(cfdp::FileDeliveryCode deliveryCode) {
   this->deliveryCode = deliveryCode;
 }
 
-cfdp::FinishedFileStatus FinishedInfo::getFileStatus() const { return fileStatus; }
+cfdp::FileDeliveryStatus FinishedInfo::getFileStatus() const { return fileStatus; }
 
 void FinishedInfo::setFilestoreResponsesArrayLen(size_t fsResponsesLen) {
   this->fsResponsesLen = fsResponsesLen;
@@ -97,6 +96,6 @@ void FinishedInfo::setFilestoreResponsesArrayLen(size_t fsResponsesLen) {
 
 size_t FinishedInfo::getFsResponsesLen() const { return fsResponsesLen; }
 
-void FinishedInfo::setFileStatus(cfdp::FinishedFileStatus fileStatus) {
+void FinishedInfo::setFileStatus(cfdp::FileDeliveryStatus fileStatus) {
   this->fileStatus = fileStatus;
 }

src/fsfw/cfdp/pdu/FinishedInfo.h

@@ -8,13 +8,13 @@
 class FinishedInfo {
  public:
   FinishedInfo();
-  FinishedInfo(cfdp::ConditionCode conditionCode, cfdp::FinishedDeliveryCode deliveryCode,
+  FinishedInfo(cfdp::ConditionCode conditionCode, cfdp::FileDeliveryCode deliveryCode,
-               cfdp::FinishedFileStatus fileStatus);
+               cfdp::FileDeliveryStatus fileStatus);
 
-  size_t getSerializedSize() const;
+  [[nodiscard]] size_t getSerializedSize() const;
 
-  bool hasFsResponses() const;
+  [[nodiscard]] bool hasFsResponses() const;
-  bool canHoldFsResponses() const;
+  [[nodiscard]] bool canHoldFsResponses() const;
 
   ReturnValue_t setFilestoreResponsesArray(FilestoreResponseTlv** fsResponses,
                                            size_t* fsResponsesLen, const size_t* maxFsResponseLen);
@@ -22,20 +22,20 @@ class FinishedInfo {
 
   ReturnValue_t getFilestoreResonses(FilestoreResponseTlv*** fsResponses, size_t* fsResponsesLen,
                                      size_t* fsResponsesMaxLen);
-  size_t getFsResponsesLen() const;
+  [[nodiscard]] size_t getFsResponsesLen() const;
   void setFilestoreResponsesArrayLen(size_t fsResponsesLen);
   ReturnValue_t getFaultLocation(EntityIdTlv** entityId);
-  cfdp::ConditionCode getConditionCode() const;
+  [[nodiscard]] cfdp::ConditionCode getConditionCode() const;
   void setConditionCode(cfdp::ConditionCode conditionCode);
-  cfdp::FinishedDeliveryCode getDeliveryCode() const;
+  [[nodiscard]] cfdp::FileDeliveryCode getDeliveryCode() const;
-  void setDeliveryCode(cfdp::FinishedDeliveryCode deliveryCode);
+  void setDeliveryCode(cfdp::FileDeliveryCode deliveryCode);
-  cfdp::FinishedFileStatus getFileStatus() const;
+  [[nodiscard]] cfdp::FileDeliveryStatus getFileStatus() const;
-  void setFileStatus(cfdp::FinishedFileStatus fileStatus);
+  void setFileStatus(cfdp::FileDeliveryStatus fileStatus);
 
  private:
   cfdp::ConditionCode conditionCode = cfdp::ConditionCode::NO_CONDITION_FIELD;
-  cfdp::FinishedDeliveryCode deliveryCode = cfdp::FinishedDeliveryCode::DATA_COMPLETE;
+  cfdp::FileDeliveryCode deliveryCode = cfdp::FileDeliveryCode::DATA_COMPLETE;
-  cfdp::FinishedFileStatus fileStatus = cfdp::FinishedFileStatus::DISCARDED_DELIBERATELY;
+  cfdp::FileDeliveryStatus fileStatus = cfdp::FileDeliveryStatus::DISCARDED_DELIBERATELY;
   FilestoreResponseTlv** fsResponses = nullptr;
   size_t fsResponsesLen = 0;
   size_t fsResponsesMaxLen = 0;

src/fsfw/cfdp/pdu/FinishedPduCreator.cpp

@@ -1,22 +1,19 @@
-#include "FinishedPduSerializer.h"
+#include "FinishedPduCreator.h"
 
-FinishPduSerializer::FinishPduSerializer(PduConfig &conf, FinishedInfo &finishInfo)
+FinishPduCreator::FinishPduCreator(PduConfig &conf, FinishedInfo &finishInfo)
-    : FileDirectiveSerializer(conf, cfdp::FileDirectives::FINISH, 0), finishInfo(finishInfo) {
+    : FileDirectiveCreator(conf, cfdp::FileDirective::FINISH, 0), finishInfo(finishInfo) {
   updateDirectiveFieldLen();
 }
 
-size_t FinishPduSerializer::getSerializedSize() const {
+size_t FinishPduCreator::getSerializedSize() const { return FinishPduCreator::getWholePduSize(); }
-  return FinishPduSerializer::getWholePduSize();
-}
 
-void FinishPduSerializer::updateDirectiveFieldLen() {
+void FinishPduCreator::updateDirectiveFieldLen() {
   setDirectiveDataFieldLen(finishInfo.getSerializedSize());
 }
 
-ReturnValue_t FinishPduSerializer::serialize(uint8_t **buffer, size_t *size, size_t maxSize,
+ReturnValue_t FinishPduCreator::serialize(uint8_t **buffer, size_t *size, size_t maxSize,
-                                             Endianness streamEndianness) const {
+                                          Endianness streamEndianness) const {
-  ReturnValue_t result =
+  ReturnValue_t result = FileDirectiveCreator::serialize(buffer, size, maxSize, streamEndianness);
-      FileDirectiveSerializer::serialize(buffer, size, maxSize, streamEndianness);
   if (result != returnvalue::OK) {
     return result;
   }

src/fsfw/cfdp/pdu/FinishedPduCreator.h

@@ -0,0 +1,24 @@
+#ifndef FSFW_CFDP_PDU_FINISHEDPDUSERIALIZER_H_
+#define FSFW_CFDP_PDU_FINISHEDPDUSERIALIZER_H_
+
+#include "FinishedInfo.h"
+#include "fsfw/cfdp/pdu/FileDataCreator.h"
+#include "fsfw/cfdp/pdu/FileDirectiveCreator.h"
+
+class FinishPduCreator : public FileDirectiveCreator {
+ public:
+  FinishPduCreator(PduConfig& pduConf, FinishedInfo& finishInfo);
+
+  void updateDirectiveFieldLen();
+
+  [[nodiscard]] size_t getSerializedSize() const override;
+
+  ReturnValue_t serialize(uint8_t** buffer, size_t* size, size_t maxSize,
+                          Endianness streamEndianness) const override;
+  using FileDirectiveCreator::serialize;
+
+ private:
+  FinishedInfo& finishInfo;
+};
+
+#endif /* FSFW_CFDP_PDU_FINISHEDPDUSERIALIZER_H_ */

src/fsfw/cfdp/pdu/FinishedPduDeserializer.h

@@ -1,22 +0,0 @@
-#ifndef FSFW_SRC_FSFW_CFDP_PDU_FINISHEDPDUDESERIALIZER_H_
-#define FSFW_SRC_FSFW_CFDP_PDU_FINISHEDPDUDESERIALIZER_H_
-
-#include "fsfw/cfdp/pdu/FileDirectiveDeserializer.h"
-#include "fsfw/cfdp/pdu/FinishedInfo.h"
-
-class FinishPduDeserializer : public FileDirectiveDeserializer {
- public:
-  FinishPduDeserializer(const uint8_t* pduBuf, size_t maxSize, FinishedInfo& info);
-
-  ReturnValue_t parseData() override;
-
-  FinishedInfo& getInfo();
-
- private:
-  FinishedInfo& finishedInfo;
-
-  ReturnValue_t parseTlvs(size_t remLen, size_t currentIdx, const uint8_t* buf,
-                          cfdp::ConditionCode conditionCode);
-};
-
-#endif /* FSFW_SRC_FSFW_CFDP_PDU_FINISHEDPDUDESERIALIZER_H_ */

src/fsfw/cfdp/pdu/FinishedPduReader.cpp

@@ -1,25 +1,24 @@
-#include "FinishedPduDeserializer.h"
+#include "FinishedPduReader.h"
 
-FinishPduDeserializer::FinishPduDeserializer(const uint8_t* pduBuf, size_t maxSize,
+FinishPduReader::FinishPduReader(const uint8_t* pduBuf, size_t maxSize, FinishedInfo& info)
-                                             FinishedInfo& info)
+    : FileDirectiveReader(pduBuf, maxSize), finishedInfo(info) {}
-    : FileDirectiveDeserializer(pduBuf, maxSize), finishedInfo(info) {}
 
-ReturnValue_t FinishPduDeserializer::parseData() {
+ReturnValue_t FinishPduReader::parseData() {
-  ReturnValue_t result = FileDirectiveDeserializer::parseData();
+  ReturnValue_t result = FileDirectiveReader::parseData();
   if (result != returnvalue::OK) {
     return result;
   }
-  size_t currentIdx = FileDirectiveDeserializer::getHeaderSize();
+  size_t currentIdx = FileDirectiveReader::getHeaderSize();
-  const uint8_t* buf = rawPtr + currentIdx;
+  const uint8_t* buf = pointers.rawPtr + currentIdx;
-  size_t remSize = FileDirectiveDeserializer::getWholePduSize() - currentIdx;
+  size_t remSize = FileDirectiveReader::getWholePduSize() - currentIdx;
   if (remSize < 1) {
     return SerializeIF::STREAM_TOO_SHORT;
   }
   uint8_t firstByte = *buf;
-  cfdp::ConditionCode condCode = static_cast<cfdp::ConditionCode>((firstByte >> 4) & 0x0f);
+  auto condCode = static_cast<cfdp::ConditionCode>((firstByte >> 4) & 0x0f);
   finishedInfo.setConditionCode(condCode);
-  finishedInfo.setDeliveryCode(static_cast<cfdp::FinishedDeliveryCode>(firstByte >> 2 & 0b1));
+  finishedInfo.setDeliveryCode(static_cast<cfdp::FileDeliveryCode>(firstByte >> 2 & 0b1));
-  finishedInfo.setFileStatus(static_cast<cfdp::FinishedFileStatus>(firstByte & 0b11));
+  finishedInfo.setFileStatus(static_cast<cfdp::FileDeliveryStatus>(firstByte & 0b11));
   buf += 1;
   remSize -= 1;
   currentIdx += 1;
@@ -29,17 +28,17 @@ ReturnValue_t FinishPduDeserializer::parseData() {
   return result;
 }
 
-FinishedInfo& FinishPduDeserializer::getInfo() { return finishedInfo; }
+FinishedInfo& FinishPduReader::getInfo() { return finishedInfo; }
 
-ReturnValue_t FinishPduDeserializer::parseTlvs(size_t remLen, size_t currentIdx, const uint8_t* buf,
+ReturnValue_t FinishPduReader::parseTlvs(size_t remLen, size_t currentIdx, const uint8_t* buf,
-                                               cfdp::ConditionCode conditionCode) {
+                                         cfdp::ConditionCode conditionCode) {
   ReturnValue_t result = returnvalue::OK;
   size_t fsResponsesIdx = 0;
   auto endianness = getEndianness();
   FilestoreResponseTlv** fsResponseArray = nullptr;
   size_t fsResponseMaxArrayLen = 0;
   EntityIdTlv* faultLocation = nullptr;
-  cfdp::TlvTypes nextTlv = cfdp::TlvTypes::INVALID_TLV;
+  cfdp::TlvType nextTlv = cfdp::TlvType::INVALID_TLV;
   while (remLen > 0) {
     // Simply forward parse the TLV type. Every TLV type except the last one must be a Filestore
     // Response TLV, and even the last one can be a Filestore Response TLV if the fault
@@ -47,8 +46,8 @@ ReturnValue_t FinishPduDeserializer::parseTlvs(size_t remLen, size_t currentIdx,
     if (currentIdx + 2 > maxSize) {
       return SerializeIF::STREAM_TOO_SHORT;
     }
-    nextTlv = static_cast<cfdp::TlvTypes>(*buf);
+    nextTlv = static_cast<cfdp::TlvType>(*buf);
-    if (nextTlv == cfdp::TlvTypes::FILESTORE_RESPONSE) {
+    if (nextTlv == cfdp::TlvType::FILESTORE_RESPONSE) {
       if (fsResponseArray == nullptr) {
         if (not finishedInfo.canHoldFsResponses()) {
           return cfdp::FINISHED_CANT_PARSE_FS_RESPONSES;
@@ -64,7 +63,7 @@ ReturnValue_t FinishPduDeserializer::parseTlvs(size_t remLen, size_t currentIdx,
         return result;
       }
       fsResponsesIdx += 1;
-    } else if (nextTlv == cfdp::TlvTypes::ENTITY_ID) {
+    } else if (nextTlv == cfdp::TlvType::ENTITY_ID) {
       // This needs to be the last TLV and it should not be here if the condition code
       // is "No Error" or "Unsupported Checksum Type"
       if (conditionCode == cfdp::ConditionCode::NO_ERROR or

src/fsfw/cfdp/pdu/FinishedPduReader.h

@@ -0,0 +1,22 @@
+#ifndef FSFW_CFDP_PDU_FINISHEDPDUDESERIALIZER_H_
+#define FSFW_CFDP_PDU_FINISHEDPDUDESERIALIZER_H_
+
+#include "fsfw/cfdp/pdu/FileDirectiveReader.h"
+#include "fsfw/cfdp/pdu/FinishedInfo.h"
+
+class FinishPduReader : public FileDirectiveReader {
+ public:
+  FinishPduReader(const uint8_t* pduBuf, size_t maxSize, FinishedInfo& info);
+
+  ReturnValue_t parseData() override;
+
+  FinishedInfo& getInfo();
+
+ private:
+  FinishedInfo& finishedInfo;
+
+  ReturnValue_t parseTlvs(size_t remLen, size_t currentIdx, const uint8_t* buf,
+                          cfdp::ConditionCode conditionCode);
+};
+
+#endif /* FSFW_CFDP_PDU_FINISHEDPDUDESERIALIZER_H_ */

src/fsfw/cfdp/pdu/FinishedPduSerializer.h

@@ -1,23 +0,0 @@
-#ifndef FSFW_SRC_FSFW_CFDP_PDU_FINISHEDPDUSERIALIZER_H_
-#define FSFW_SRC_FSFW_CFDP_PDU_FINISHEDPDUSERIALIZER_H_
-
-#include "FinishedInfo.h"
-#include "fsfw/cfdp/pdu/FileDataSerializer.h"
-#include "fsfw/cfdp/pdu/FileDirectiveSerializer.h"
-
-class FinishPduSerializer : public FileDirectiveSerializer {
- public:
-  FinishPduSerializer(PduConfig& pduConf, FinishedInfo& finishInfo);
-
-  void updateDirectiveFieldLen();
-
-  size_t getSerializedSize() const override;
-
-  ReturnValue_t serialize(uint8_t** buffer, size_t* size, size_t maxSize,
-                          Endianness streamEndianness) const override;
-
- private:
-  FinishedInfo& finishInfo;
-};
-
-#endif /* FSFW_SRC_FSFW_CFDP_PDU_FINISHEDPDUSERIALIZER_H_ */

src/fsfw/cfdp/pdu/HeaderCreator.cpp

@@ -0,0 +1,111 @@
+#include "HeaderCreator.h"
+
+HeaderCreator::HeaderCreator(PduConfig &pduConf, cfdp::PduType pduType, size_t initPduDataFieldLen,
+                             cfdp::SegmentMetadataFlag segmentMetadataFlag,
+                             cfdp::SegmentationControl segCtrl)
+    : pduType(pduType),
+      segmentMetadataFlag(segmentMetadataFlag),
+      segmentationCtrl(segCtrl),
+      pduDataFieldLen(initPduDataFieldLen),
+      pduConf(pduConf) {}
+
+ReturnValue_t HeaderCreator::serialize(uint8_t **buffer, size_t *size, size_t maxSize,
+                                       Endianness streamEndianness) const {
+  if (buffer == nullptr or size == nullptr) {
+    return returnvalue::FAILED;
+  }
+  if (maxSize < this->getSerializedSize()) {
+    return BUFFER_TOO_SHORT;
+  }
+  **buffer = cfdp::VERSION_BITS | this->pduType << 4 | pduConf.direction << 3 | pduConf.mode << 2 |
+             pduConf.crcFlag << 1 | pduConf.largeFile;
+  *buffer += 1;
+  **buffer = (pduDataFieldLen & 0xff00) >> 8;
+  *buffer += 1;
+  **buffer = pduDataFieldLen & 0x00ff;
+  *buffer += 1;
+  **buffer = segmentationCtrl << 7 | pduConf.sourceId.getWidth() << 4 | segmentMetadataFlag << 3 |
+             pduConf.seqNum.getWidth();
+  *buffer += 1;
+  *size += 4;
+  ReturnValue_t result = pduConf.sourceId.serialize(buffer, size, maxSize, streamEndianness);
+  if (result != returnvalue::OK) {
+    return result;
+  }
+  result = pduConf.seqNum.serialize(buffer, size, maxSize, streamEndianness);
+  if (result != returnvalue::OK) {
+    return result;
+  }
+  result = pduConf.destId.serialize(buffer, size, maxSize, streamEndianness);
+  if (result != returnvalue::OK) {
+    return result;
+  }
+
+  return returnvalue::OK;
+}
+
+size_t HeaderCreator::getSerializedSize() const {
+  return pduConf.seqNum.getWidth() + pduConf.sourceId.getWidth() * 2 + 4;
+}
+
+ReturnValue_t HeaderCreator::deSerialize(const uint8_t **buffer, size_t *size,
+                                         Endianness streamEndianness) {
+  // We could implement this, but I prefer dedicated classes
+  return returnvalue::FAILED;
+}
+
+size_t HeaderCreator::getWholePduSize() const {
+  // Return size of header plus the PDU data field length
+  return pduDataFieldLen + HeaderCreator::getSerializedSize();
+}
+
+size_t HeaderCreator::getPduDataFieldLen() const { return pduDataFieldLen; }
+
+void HeaderCreator::setPduDataFieldLen(size_t pduDataFieldLen_) {
+  pduDataFieldLen = pduDataFieldLen_;
+}
+
+void HeaderCreator::setPduType(cfdp::PduType pduType_) { pduType = pduType_; }
+
+void HeaderCreator::setSegmentMetadataFlag(cfdp::SegmentMetadataFlag segmentMetadataFlag_) {
+  segmentMetadataFlag = segmentMetadataFlag_;
+}
+
+cfdp::PduType HeaderCreator::getPduType() const { return pduType; }
+
+cfdp::Direction HeaderCreator::getDirection() const { return pduConf.direction; }
+
+cfdp::TransmissionMode HeaderCreator::getTransmissionMode() const { return pduConf.mode; }
+
+bool HeaderCreator::getCrcFlag() const { return pduConf.crcFlag; }
+
+bool HeaderCreator::getLargeFileFlag() const { return pduConf.largeFile; }
+
+cfdp::SegmentationControl HeaderCreator::getSegmentationControl() const { return segmentationCtrl; }
+
+cfdp::WidthInBytes HeaderCreator::getLenEntityIds() const { return pduConf.sourceId.getWidth(); }
+
+cfdp::WidthInBytes HeaderCreator::getLenSeqNum() const { return pduConf.seqNum.getWidth(); }
+
+cfdp::SegmentMetadataFlag HeaderCreator::getSegmentMetadataFlag() const {
+  return segmentMetadataFlag;
+}
+
+void HeaderCreator::getSourceId(cfdp::EntityId &sourceId) const { sourceId = pduConf.sourceId; }
+
+void HeaderCreator::getDestId(cfdp::EntityId &destId) const { destId = pduConf.destId; }
+
+void HeaderCreator::setSegmentationControl(cfdp::SegmentationControl segmentationControl) {
+  this->segmentationCtrl = segmentationControl;
+}
+
+void HeaderCreator::getTransactionSeqNum(cfdp::TransactionSeqNum &seqNum) const {
+  seqNum = pduConf.seqNum;
+}
+
+bool HeaderCreator::hasSegmentMetadataFlag() const {
+  if (this->segmentMetadataFlag == cfdp::SegmentMetadataFlag::PRESENT) {
+    return true;
+  }
+  return false;
+}

src/fsfw/cfdp/pdu/HeaderCreator.h

@@ -1,14 +1,14 @@
 #ifndef FSFW_SRC_FSFW_CFDP_PDU_HEADERSERIALIZER_H_
 #define FSFW_SRC_FSFW_CFDP_PDU_HEADERSERIALIZER_H_
 
-#include "../definitions.h"
 #include "PduConfig.h"
 #include "PduHeaderIF.h"
+#include "fsfw/cfdp/definitions.h"
 #include "fsfw/serialize/SerializeIF.h"
 
-class HeaderSerializer : public SerializeIF, public PduHeaderIF {
+class HeaderCreator : public SerializeIF, public PduHeaderIF {
  public:
-  HeaderSerializer(
+  HeaderCreator(
       PduConfig& pduConf, cfdp::PduType pduType, size_t initPduDataFieldLen,
       cfdp::SegmentMetadataFlag segmentMetadataFlag = cfdp::SegmentMetadataFlag::NOT_PRESENT,
       cfdp::SegmentationControl segCtrl =
@@ -23,7 +23,7 @@ class HeaderSerializer : public SerializeIF, public PduHeaderIF {
    * data field length was not properly.
    * @return
    */
-  size_t getSerializedSize() const override;
+  [[nodiscard]] size_t getSerializedSize() const override;
 
   ReturnValue_t deSerialize(const uint8_t** buffer, size_t* size,
                             Endianness streamEndianness) override;
@@ -32,19 +32,19 @@ class HeaderSerializer : public SerializeIF, public PduHeaderIF {
   void setPduType(cfdp::PduType pduType);
   void setSegmentMetadataFlag(cfdp::SegmentMetadataFlag);
 
-  size_t getPduDataFieldLen() const override;
+  [[nodiscard]] size_t getPduDataFieldLen() const override;
-  size_t getWholePduSize() const override;
+  [[nodiscard]] size_t getWholePduSize() const override;
 
-  cfdp::PduType getPduType() const override;
+  [[nodiscard]] cfdp::PduType getPduType() const override;
-  cfdp::Direction getDirection() const override;
+  [[nodiscard]] cfdp::Direction getDirection() const override;
-  cfdp::TransmissionModes getTransmissionMode() const override;
+  [[nodiscard]] cfdp::TransmissionMode getTransmissionMode() const override;
-  bool getCrcFlag() const override;
+  [[nodiscard]] bool getCrcFlag() const override;
-  bool getLargeFileFlag() const override;
+  [[nodiscard]] bool getLargeFileFlag() const override;
-  cfdp::SegmentationControl getSegmentationControl() const override;
+  [[nodiscard]] cfdp::SegmentationControl getSegmentationControl() const override;
-  cfdp::WidthInBytes getLenEntityIds() const override;
+  [[nodiscard]] cfdp::WidthInBytes getLenEntityIds() const override;
-  cfdp::WidthInBytes getLenSeqNum() const override;
+  [[nodiscard]] cfdp::WidthInBytes getLenSeqNum() const override;
-  cfdp::SegmentMetadataFlag getSegmentMetadataFlag() const override;
+  [[nodiscard]] cfdp::SegmentMetadataFlag getSegmentMetadataFlag() const override;
-  bool hasSegmentMetadataFlag() const override;
+  [[nodiscard]] bool hasSegmentMetadataFlag() const override;
   void setSegmentationControl(cfdp::SegmentationControl);
 
   void getSourceId(cfdp::EntityId& sourceId) const override;

src/fsfw/cfdp/pdu/HeaderDeserializer.cpp

@@ -1,128 +0,0 @@
-#include "HeaderDeserializer.h"
-
-#include <fsfw/serialize/SerializeAdapter.h>
-
-#include <cstring>
-
-HeaderDeserializer::HeaderDeserializer(const uint8_t *pduBuf, size_t maxSize)
-    : rawPtr(pduBuf), maxSize(maxSize) {}
-
-ReturnValue_t HeaderDeserializer::parseData() {
-  if (maxSize < 7) {
-    return SerializeIF::STREAM_TOO_SHORT;
-  }
-  return setData(const_cast<uint8_t *>(rawPtr), maxSize);
-}
-
-ReturnValue_t HeaderDeserializer::setData(uint8_t *dataPtr, size_t maxSize, void *args) {
-  if (dataPtr == nullptr) {
-    // Allowed for now
-    this->fixedHeader = nullptr;
-    return returnvalue::OK;
-  }
-  this->fixedHeader = reinterpret_cast<PduHeaderFixedStruct *>(const_cast<uint8_t *>(dataPtr));
-  sourceIdRaw = static_cast<uint8_t *>(&fixedHeader->variableFieldsStart);
-  cfdp::WidthInBytes widthEntityIds = getLenEntityIds();
-  cfdp::WidthInBytes widthSeqNum = getLenSeqNum();
-  seqNumRaw = static_cast<uint8_t *>(sourceIdRaw) + static_cast<uint8_t>(widthEntityIds);
-  destIdRaw = static_cast<uint8_t *>(seqNumRaw) + static_cast<uint8_t>(widthSeqNum);
-  this->maxSize = maxSize;
-  return returnvalue::OK;
-}
-
-size_t HeaderDeserializer::getHeaderSize() const {
-  if (fixedHeader != nullptr) {
-    return getLenEntityIds() * 2 + getLenSeqNum() + 4;
-  }
-  return 0;
-}
-
-size_t HeaderDeserializer::getPduDataFieldLen() const {
-  uint16_t pduFiedlLen = (fixedHeader->pduDataFieldLenH << 8) | fixedHeader->pduDataFieldLenL;
-  return pduFiedlLen;
-}
-
-size_t HeaderDeserializer::getWholePduSize() const {
-  return getPduDataFieldLen() + getHeaderSize();
-}
-
-cfdp::PduType HeaderDeserializer::getPduType() const {
-  return static_cast<cfdp::PduType>((fixedHeader->firstByte >> 4) & 0x01);
-}
-
-cfdp::Direction HeaderDeserializer::getDirection() const {
-  return static_cast<cfdp::Direction>((fixedHeader->firstByte >> 3) & 0x01);
-}
-
-cfdp::TransmissionModes HeaderDeserializer::getTransmissionMode() const {
-  return static_cast<cfdp::TransmissionModes>((fixedHeader->firstByte >> 2) & 0x01);
-}
-
-bool HeaderDeserializer::getCrcFlag() const { return (fixedHeader->firstByte >> 1) & 0x01; }
-
-bool HeaderDeserializer::getLargeFileFlag() const { return fixedHeader->firstByte & 0x01; }
-
-cfdp::SegmentationControl HeaderDeserializer::getSegmentationControl() const {
-  return static_cast<cfdp::SegmentationControl>((fixedHeader->fourthByte >> 7) & 0x01);
-}
-
-cfdp::WidthInBytes HeaderDeserializer::getLenEntityIds() const {
-  return static_cast<cfdp::WidthInBytes>((fixedHeader->fourthByte >> 4) & 0x07);
-}
-
-cfdp::WidthInBytes HeaderDeserializer::getLenSeqNum() const {
-  return static_cast<cfdp::WidthInBytes>(fixedHeader->fourthByte & 0x07);
-}
-
-cfdp::SegmentMetadataFlag HeaderDeserializer::getSegmentMetadataFlag() const {
-  return static_cast<cfdp::SegmentMetadataFlag>((fixedHeader->fourthByte >> 3) & 0x01);
-}
-
-void HeaderDeserializer::getSourceId(cfdp::EntityId &sourceId) const {
-  assignVarLenField(dynamic_cast<cfdp::VarLenField *>(&sourceId), getLenEntityIds(),
-                    this->sourceIdRaw);
-}
-
-void HeaderDeserializer::getDestId(cfdp::EntityId &destId) const {
-  assignVarLenField(dynamic_cast<cfdp::VarLenField *>(&destId), getLenEntityIds(), this->destIdRaw);
-}
-
-void HeaderDeserializer::getTransactionSeqNum(cfdp::TransactionSeqNum &seqNum) const {
-  assignVarLenField(dynamic_cast<cfdp::VarLenField *>(&seqNum), getLenSeqNum(), this->seqNumRaw);
-}
-
-void HeaderDeserializer::assignVarLenField(cfdp::VarLenField *field, cfdp::WidthInBytes width,
-                                           void *sourcePtr) const {
-  switch (width) {
-    case (cfdp::WidthInBytes::ONE_BYTE): {
-      uint8_t *fieldTyped = static_cast<uint8_t *>(sourcePtr);
-      field->setValue(width, *fieldTyped);
-      break;
-    }
-    case (cfdp::WidthInBytes::TWO_BYTES): {
-      uint16_t fieldTyped = 0;
-      size_t deserSize = 0;
-      SerializeAdapter::deSerialize(&fieldTyped, static_cast<uint8_t *>(sourcePtr), &deserSize,
-                                    SerializeIF::Endianness::NETWORK);
-      field->setValue(width, fieldTyped);
-      break;
-    }
-    case (cfdp::WidthInBytes::FOUR_BYTES): {
-      uint32_t fieldTyped = 0;
-      size_t deserSize = 0;
-      SerializeAdapter::deSerialize(&fieldTyped, static_cast<uint8_t *>(sourcePtr), &deserSize,
-                                    SerializeIF::Endianness::NETWORK);
-      field->setValue(width, fieldTyped);
-      break;
-    }
-  }
-}
-
-size_t HeaderDeserializer::getMaxSize() const { return maxSize; }
-
-bool HeaderDeserializer::hasSegmentMetadataFlag() const {
-  if (this->getSegmentMetadataFlag() == cfdp::SegmentMetadataFlag::PRESENT) {
-    return true;
-  }
-  return false;
-}

src/fsfw/cfdp/pdu/HeaderReader.cpp

@@ -0,0 +1,160 @@
+#include <fsfw/serialize/SerializeAdapter.h>
+
+#include <cstring>
+
+#include "PduHeaderReader.h"
+
+PduHeaderReader::PduHeaderReader(const uint8_t *pduBuf, size_t maxSize) {
+  setReadOnlyData(pduBuf, maxSize);
+}
+
+ReturnValue_t PduHeaderReader::parseData() {
+  if (pointers.rawPtr == nullptr) {
+    return returnvalue::FAILED;
+  }
+  if (maxSize < 7) {
+    return SerializeIF::STREAM_TOO_SHORT;
+  }
+  pointers.fixedHeader =
+      reinterpret_cast<PduHeaderFixedStruct *>(const_cast<uint8_t *>(pointers.rawPtr));
+  sourceIdRaw = static_cast<uint8_t *>(&pointers.fixedHeader->variableFieldsStart);
+  cfdp::WidthInBytes widthEntityIds = getLenEntityIds();
+  cfdp::WidthInBytes widthSeqNum = getLenSeqNum();
+  seqNumRaw = static_cast<uint8_t *>(sourceIdRaw) + static_cast<uint8_t>(widthEntityIds);
+  destIdRaw = static_cast<uint8_t *>(seqNumRaw) + static_cast<uint8_t>(widthSeqNum);
+  if (getWholePduSize() > PduHeaderReader::getHeaderSize()) {
+    pointers.dataFieldStart = reinterpret_cast<const uint8_t *>(destIdRaw) + widthEntityIds;
+  } else {
+    pointers.dataFieldStart = nullptr;
+  }
+  return returnvalue::OK;
+}
+
+ReturnValue_t PduHeaderReader::setData(uint8_t *dataPtr, size_t maxSize_, void *args) {
+  if (dataPtr == nullptr) {
+    return returnvalue::FAILED;
+  }
+  if (maxSize_ < 7) {
+    return SerializeIF::STREAM_TOO_SHORT;
+  }
+  pointers.rawPtr = dataPtr;
+  maxSize = maxSize_;
+  return returnvalue::OK;
+}
+
+size_t PduHeaderReader::getHeaderSize() const {
+  if (pointers.fixedHeader != nullptr) {
+    return getLenEntityIds() * 2 + getLenSeqNum() + 4;
+  }
+  return 0;
+}
+
+size_t PduHeaderReader::getPduDataFieldLen() const {
+  return (pointers.fixedHeader->pduDataFieldLenH << 8) | pointers.fixedHeader->pduDataFieldLenL;
+}
+
+size_t PduHeaderReader::getWholePduSize() const {
+  return getPduDataFieldLen() + PduHeaderReader::getHeaderSize();
+}
+
+cfdp::PduType PduHeaderReader::getPduType() const {
+  return static_cast<cfdp::PduType>((pointers.fixedHeader->firstByte >> 4) & 0x01);
+}
+
+cfdp::Direction PduHeaderReader::getDirection() const {
+  return static_cast<cfdp::Direction>((pointers.fixedHeader->firstByte >> 3) & 0x01);
+}
+
+cfdp::TransmissionMode PduHeaderReader::getTransmissionMode() const {
+  return static_cast<cfdp::TransmissionMode>((pointers.fixedHeader->firstByte >> 2) & 0x01);
+}
+
+bool PduHeaderReader::getCrcFlag() const { return (pointers.fixedHeader->firstByte >> 1) & 0x01; }
+
+bool PduHeaderReader::getLargeFileFlag() const { return pointers.fixedHeader->firstByte & 0x01; }
+
+cfdp::SegmentationControl PduHeaderReader::getSegmentationControl() const {
+  return static_cast<cfdp::SegmentationControl>((pointers.fixedHeader->fourthByte >> 7) & 0x01);
+}
+
+cfdp::WidthInBytes PduHeaderReader::getLenEntityIds() const {
+  return static_cast<cfdp::WidthInBytes>((pointers.fixedHeader->fourthByte >> 4) & 0x07);
+}
+
+cfdp::WidthInBytes PduHeaderReader::getLenSeqNum() const {
+  return static_cast<cfdp::WidthInBytes>(pointers.fixedHeader->fourthByte & 0x07);
+}
+
+cfdp::SegmentMetadataFlag PduHeaderReader::getSegmentMetadataFlag() const {
+  return static_cast<cfdp::SegmentMetadataFlag>((pointers.fixedHeader->fourthByte >> 3) & 0x01);
+}
+
+void PduHeaderReader::getSourceId(cfdp::EntityId &sourceId) const {
+  assignVarLenField(dynamic_cast<cfdp::VarLenField *>(&sourceId), getLenEntityIds(),
+                    this->sourceIdRaw);
+}
+
+void PduHeaderReader::getDestId(cfdp::EntityId &destId) const {
+  assignVarLenField(dynamic_cast<cfdp::VarLenField *>(&destId), getLenEntityIds(), this->destIdRaw);
+}
+
+void PduHeaderReader::getTransactionSeqNum(cfdp::TransactionSeqNum &seqNum) const {
+  assignVarLenField(dynamic_cast<cfdp::VarLenField *>(&seqNum), getLenSeqNum(), this->seqNumRaw);
+}
+
+void PduHeaderReader::assignVarLenField(cfdp::VarLenField *field, cfdp::WidthInBytes width,
+                                        void *sourcePtr) const {
+  switch (width) {
+    case (cfdp::WidthInBytes::ONE_BYTE): {
+      auto *fieldTyped = static_cast<uint8_t *>(sourcePtr);
+      field->setValue(width, *fieldTyped);
+      break;
+    }
+    case (cfdp::WidthInBytes::TWO_BYTES): {
+      uint16_t fieldTyped = 0;
+      size_t deserSize = 0;
+      SerializeAdapter::deSerialize(&fieldTyped, static_cast<uint8_t *>(sourcePtr), &deserSize,
+                                    SerializeIF::Endianness::NETWORK);
+      field->setValue(width, fieldTyped);
+      break;
+    }
+    case (cfdp::WidthInBytes::FOUR_BYTES): {
+      uint32_t fieldTyped = 0;
+      size_t deserSize = 0;
+      SerializeAdapter::deSerialize(&fieldTyped, static_cast<uint8_t *>(sourcePtr), &deserSize,
+                                    SerializeIF::Endianness::NETWORK);
+      field->setValue(width, fieldTyped);
+      break;
+    }
+  }
+}
+
+size_t PduHeaderReader::getMaxSize() const { return maxSize; }
+
+bool PduHeaderReader::hasSegmentMetadataFlag() const {
+  if (this->getSegmentMetadataFlag() == cfdp::SegmentMetadataFlag::PRESENT) {
+    return true;
+  }
+  return false;
+}
+
+ReturnValue_t PduHeaderReader::setReadOnlyData(const uint8_t *dataPtr, size_t maxSize_) {
+  return setData(const_cast<uint8_t *>(dataPtr), maxSize_, nullptr);
+}
+bool PduHeaderReader::isNull() const {
+  return pointers.rawPtr == nullptr or pointers.fixedHeader == nullptr;
+}
+
+PduHeaderReader::operator bool() const { return not isNull(); }
+
+void PduHeaderReader::fillConfig(PduConfig &cfg) const {
+  cfg.largeFile = getLargeFileFlag();
+  cfg.crcFlag = getCrcFlag();
+  cfg.mode = getTransmissionMode();
+  cfg.direction = getDirection();
+  getTransactionSeqNum(cfg.seqNum);
+  getSourceId(cfg.sourceId);
+  getDestId(cfg.destId);
+}
+
+const uint8_t *PduHeaderReader::getPduDataField() const { return pointers.dataFieldStart; }

src/fsfw/cfdp/pdu/HeaderSerializer.cpp

@@ -1,117 +0,0 @@
-#include "HeaderSerializer.h"
-
-#include "HeaderDeserializer.h"
-
-HeaderSerializer::HeaderSerializer(PduConfig &pduConf, cfdp::PduType pduType,
-                                   size_t initPduDataFieldLen,
-                                   cfdp::SegmentMetadataFlag segmentMetadataFlag,
-                                   cfdp::SegmentationControl segCtrl)
-    : pduType(pduType),
-      segmentMetadataFlag(segmentMetadataFlag),
-      segmentationCtrl(segCtrl),
-      pduDataFieldLen(initPduDataFieldLen),
-      pduConf(pduConf) {}
-
-ReturnValue_t HeaderSerializer::serialize(uint8_t **buffer, size_t *size, size_t maxSize,
-                                          Endianness streamEndianness) const {
-  if (buffer == nullptr or size == nullptr) {
-    return returnvalue::FAILED;
-  }
-  if (maxSize < this->getSerializedSize()) {
-    return BUFFER_TOO_SHORT;
-  }
-  **buffer = cfdp::VERSION_BITS | this->pduType << 4 | pduConf.direction << 3 | pduConf.mode << 2 |
-             pduConf.crcFlag << 1 | pduConf.largeFile;
-  *buffer += 1;
-  **buffer = (pduDataFieldLen & 0xff00) >> 8;
-  *buffer += 1;
-  **buffer = pduDataFieldLen & 0x00ff;
-  *buffer += 1;
-  **buffer = segmentationCtrl << 7 | pduConf.sourceId.getWidth() << 4 | segmentMetadataFlag << 3 |
-             pduConf.seqNum.getWidth();
-  *buffer += 1;
-  *size += 4;
-  ReturnValue_t result = pduConf.sourceId.serialize(buffer, size, maxSize, streamEndianness);
-  if (result != returnvalue::OK) {
-    return result;
-  }
-  result = pduConf.seqNum.serialize(buffer, size, maxSize, streamEndianness);
-  if (result != returnvalue::OK) {
-    return result;
-  }
-  result = pduConf.destId.serialize(buffer, size, maxSize, streamEndianness);
-  if (result != returnvalue::OK) {
-    return result;
-  }
-
-  return returnvalue::OK;
-}
-
-size_t HeaderSerializer::getSerializedSize() const {
-  size_t shit = pduConf.seqNum.getWidth() + pduConf.sourceId.getWidth() * 2 + 4;
-  return shit;
-}
-
-ReturnValue_t HeaderSerializer::deSerialize(const uint8_t **buffer, size_t *size,
-                                            Endianness streamEndianness) {
-  // We could implement this, but I prefer dedicated classes
-  return returnvalue::FAILED;
-}
-
-size_t HeaderSerializer::getWholePduSize() const {
-  // Return size of header plus the PDU data field length
-  return pduDataFieldLen + HeaderSerializer::getSerializedSize();
-}
-
-size_t HeaderSerializer::getPduDataFieldLen() const { return pduDataFieldLen; }
-
-void HeaderSerializer::setPduDataFieldLen(size_t pduDataFieldLen) {
-  this->pduDataFieldLen = pduDataFieldLen;
-}
-
-void HeaderSerializer::setPduType(cfdp::PduType pduType) { this->pduType = pduType; }
-
-void HeaderSerializer::setSegmentMetadataFlag(cfdp::SegmentMetadataFlag segmentMetadataFlag) {
-  this->segmentMetadataFlag = segmentMetadataFlag;
-}
-
-cfdp::PduType HeaderSerializer::getPduType() const { return pduType; }
-
-cfdp::Direction HeaderSerializer::getDirection() const { return pduConf.direction; }
-
-cfdp::TransmissionModes HeaderSerializer::getTransmissionMode() const { return pduConf.mode; }
-
-bool HeaderSerializer::getCrcFlag() const { return pduConf.crcFlag; }
-
-bool HeaderSerializer::getLargeFileFlag() const { return pduConf.largeFile; }
-
-cfdp::SegmentationControl HeaderSerializer::getSegmentationControl() const {
-  return segmentationCtrl;
-}
-
-cfdp::WidthInBytes HeaderSerializer::getLenEntityIds() const { return pduConf.sourceId.getWidth(); }
-
-cfdp::WidthInBytes HeaderSerializer::getLenSeqNum() const { return pduConf.seqNum.getWidth(); }
-
-cfdp::SegmentMetadataFlag HeaderSerializer::getSegmentMetadataFlag() const {
-  return segmentMetadataFlag;
-}
-
-void HeaderSerializer::getSourceId(cfdp::EntityId &sourceId) const { sourceId = pduConf.sourceId; }
-
-void HeaderSerializer::getDestId(cfdp::EntityId &destId) const { destId = pduConf.destId; }
-
-void HeaderSerializer::setSegmentationControl(cfdp::SegmentationControl segmentationControl) {
-  this->segmentationCtrl = segmentationControl;
-}
-
-void HeaderSerializer::getTransactionSeqNum(cfdp::TransactionSeqNum &seqNum) const {
-  seqNum = pduConf.seqNum;
-}
-
-bool HeaderSerializer::hasSegmentMetadataFlag() const {
-  if (this->segmentMetadataFlag == cfdp::SegmentMetadataFlag::PRESENT) {
-    return true;
-  }
-  return false;
-}

src/fsfw/cfdp/pdu/KeepAlivePduCreator.cpp

@@ -0,0 +1,25 @@
+#include "KeepAlivePduCreator.h"
+
+KeepAlivePduCreator::KeepAlivePduCreator(PduConfig &conf, cfdp::FileSize &progress)
+    : FileDirectiveCreator(conf, cfdp::FileDirective::KEEP_ALIVE, 4), progress(progress) {
+  updateDirectiveFieldLen();
+}
+
+size_t KeepAlivePduCreator::getSerializedSize() const {
+  return FileDirectiveCreator::getWholePduSize();
+}
+
+void KeepAlivePduCreator::updateDirectiveFieldLen() {
+  if (this->getLargeFileFlag()) {
+    this->setDirectiveDataFieldLen(8);
+  }
+}
+
+ReturnValue_t KeepAlivePduCreator::serialize(uint8_t **buffer, size_t *size, size_t maxSize,
+                                             Endianness streamEndianness) const {
+  ReturnValue_t result = FileDirectiveCreator::serialize(buffer, size, maxSize, streamEndianness);
+  if (result != returnvalue::OK) {
+    return result;
+  }
+  return progress.serialize(this->getLargeFileFlag(), buffer, size, maxSize, streamEndianness);
+}

src/fsfw/cfdp/pdu/KeepAlivePduCreator.h

@@ -0,0 +1,22 @@
+#ifndef FSFW_CFDP_PDU_KEEPALIVEPDUSERIALIZER_H_
+#define FSFW_CFDP_PDU_KEEPALIVEPDUSERIALIZER_H_
+
+#include "fsfw/cfdp/FileSize.h"
+#include "fsfw/cfdp/pdu/FileDirectiveCreator.h"
+
+class KeepAlivePduCreator : public FileDirectiveCreator {
+ public:
+  KeepAlivePduCreator(PduConfig& conf, cfdp::FileSize& progress);
+
+  void updateDirectiveFieldLen();
+
+  [[nodiscard]] size_t getSerializedSize() const override;
+
+  ReturnValue_t serialize(uint8_t** buffer, size_t* size, size_t maxSize,
+                          Endianness streamEndianness) const override;
+
+ private:
+  cfdp::FileSize& progress;
+};
+
+#endif /* FSFW_CFDP_PDU_KEEPALIVEPDUSERIALIZER_H_ */

src/fsfw/cfdp/pdu/KeepAlivePduDeserializer.cpp

@@ -1,18 +0,0 @@
-#include "KeepAlivePduDeserializer.h"
-
-KeepAlivePduDeserializer::KeepAlivePduDeserializer(const uint8_t* pduBuf, size_t maxSize,
-                                                   cfdp::FileSize& progress)
-    : FileDirectiveDeserializer(pduBuf, maxSize), progress(progress) {}
-
-ReturnValue_t KeepAlivePduDeserializer::parseData() {
-  ReturnValue_t result = FileDirectiveDeserializer::parseData();
-  if (result != returnvalue::OK) {
-    return result;
-  }
-  size_t currentIdx = FileDirectiveDeserializer::getHeaderSize();
-  size_t remLen = FileDirectiveDeserializer::getWholePduSize() - currentIdx;
-  const uint8_t* buffer = rawPtr + currentIdx;
-  return progress.deSerialize(&buffer, &remLen, getEndianness());
-}
-
-cfdp::FileSize& KeepAlivePduDeserializer::getProgress() { return progress; }

src/fsfw/cfdp/pdu/KeepAlivePduDeserializer.h

@@ -1,19 +0,0 @@
-#ifndef FSFW_SRC_FSFW_CFDP_PDU_KEEPALIVEPDUDESERIALIZER_H_
-#define FSFW_SRC_FSFW_CFDP_PDU_KEEPALIVEPDUDESERIALIZER_H_
-
-#include "fsfw/cfdp/FileSize.h"
-#include "fsfw/cfdp/pdu/FileDirectiveDeserializer.h"
-
-class KeepAlivePduDeserializer : public FileDirectiveDeserializer {
- public:
-  KeepAlivePduDeserializer(const uint8_t* pduBuf, size_t maxSize, cfdp::FileSize& progress);
-
-  ReturnValue_t parseData() override;
-
-  cfdp::FileSize& getProgress();
-
- private:
-  cfdp::FileSize& progress;
-};
-
-#endif /* FSFW_SRC_FSFW_CFDP_PDU_KEEPALIVEPDUDESERIALIZER_H_ */

src/fsfw/cfdp/pdu/KeepAlivePduReader.cpp

@@ -0,0 +1,18 @@
+#include "KeepAlivePduReader.h"
+
+KeepAlivePduReader::KeepAlivePduReader(const uint8_t* pduBuf, size_t maxSize,
+                                       cfdp::FileSize& progress)
+    : FileDirectiveReader(pduBuf, maxSize), progress(progress) {}
+
+ReturnValue_t KeepAlivePduReader::parseData() {
+  ReturnValue_t result = FileDirectiveReader::parseData();
+  if (result != returnvalue::OK) {
+    return result;
+  }
+  size_t currentIdx = FileDirectiveReader::getHeaderSize();
+  size_t remLen = FileDirectiveReader::getWholePduSize() - currentIdx;
+  const uint8_t* buffer = pointers.rawPtr + currentIdx;
+  return progress.deSerialize(&buffer, &remLen, getEndianness());
+}
+
+cfdp::FileSize& KeepAlivePduReader::getProgress() { return progress; }

src/fsfw/cfdp/pdu/KeepAlivePduReader.h

@@ -0,0 +1,19 @@
+#ifndef FSFW_CFDP_PDU_KEEPALIVEREADER_H_
+#define FSFW_CFDP_PDU_KEEPALIVEREADER_H_
+
+#include "fsfw/cfdp/FileSize.h"
+#include "fsfw/cfdp/pdu/FileDirectiveReader.h"
+
+class KeepAlivePduReader : public FileDirectiveReader {
+ public:
+  KeepAlivePduReader(const uint8_t* pduBuf, size_t maxSize, cfdp::FileSize& progress);
+
+  ReturnValue_t parseData() override;
+
+  cfdp::FileSize& getProgress();
+
+ private:
+  cfdp::FileSize& progress;
+};
+
+#endif /* FSFW_CFDP_PDU_KEEPALIVEPDUREADER_H_ */

src/fsfw/cfdp/pdu/KeepAlivePduSerializer.cpp

@@ -1,26 +0,0 @@
-#include "KeepAlivePduSerializer.h"
-
-KeepAlivePduSerializer::KeepAlivePduSerializer(PduConfig &conf, cfdp::FileSize &progress)
-    : FileDirectiveSerializer(conf, cfdp::FileDirectives::KEEP_ALIVE, 4), progress(progress) {
-  updateDirectiveFieldLen();
-}
-
-size_t KeepAlivePduSerializer::getSerializedSize() const {
-  return FileDirectiveSerializer::getWholePduSize();
-}
-
-void KeepAlivePduSerializer::updateDirectiveFieldLen() {
-  if (this->getLargeFileFlag()) {
-    this->setDirectiveDataFieldLen(8);
-  }
-}
-
-ReturnValue_t KeepAlivePduSerializer::serialize(uint8_t **buffer, size_t *size, size_t maxSize,
-                                                Endianness streamEndianness) const {
-  ReturnValue_t result =
-      FileDirectiveSerializer::serialize(buffer, size, maxSize, streamEndianness);
-  if (result != returnvalue::OK) {
-    return result;
-  }
-  return progress.serialize(this->getLargeFileFlag(), buffer, size, maxSize, streamEndianness);
-}

src/fsfw/cfdp/pdu/KeepAlivePduSerializer.h

@@ -1,22 +0,0 @@
-#ifndef FSFW_SRC_FSFW_CFDP_PDU_KEEPALIVEPDUSERIALIZER_H_
-#define FSFW_SRC_FSFW_CFDP_PDU_KEEPALIVEPDUSERIALIZER_H_
-
-#include "fsfw/cfdp/FileSize.h"
-#include "fsfw/cfdp/pdu/FileDirectiveSerializer.h"
-
-class KeepAlivePduSerializer : public FileDirectiveSerializer {
- public:
-  KeepAlivePduSerializer(PduConfig& conf, cfdp::FileSize& progress);
-
-  void updateDirectiveFieldLen();
-
-  size_t getSerializedSize() const override;
-
-  ReturnValue_t serialize(uint8_t** buffer, size_t* size, size_t maxSize,
-                          Endianness streamEndianness) const override;
-
- private:
-  cfdp::FileSize& progress;
-};
-
-#endif /* FSFW_SRC_FSFW_CFDP_PDU_KEEPALIVEPDUSERIALIZER_H_ */

src/fsfw/cfdp/pdu/MetadataInfo.cpp

@@ -1,49 +1,52 @@
 #include "MetadataInfo.h"
 
 MetadataInfo::MetadataInfo(bool closureRequested, cfdp::ChecksumType checksumType,
-                           cfdp::FileSize& fileSize, cfdp::Lv& sourceFileName,
+                           cfdp::FileSize& fileSize, cfdp::StringLv& sourceFileName,
-                           cfdp::Lv& destFileName)
+                           cfdp::StringLv& destFileName)
-    : closureRequested(closureRequested),
+    : MetadataInfo(fileSize, sourceFileName, destFileName) {
-      checksumType(checksumType),
+  this->closureRequested = closureRequested;
-      fileSize(fileSize),
+  this->checksumType = checksumType;
-      sourceFileName(sourceFileName),
+}
-      destFileName(destFileName) {}
 
-void MetadataInfo::setOptionsArray(cfdp::Tlv** optionsArray, size_t* optionsLen,
+MetadataInfo::MetadataInfo(cfdp::FileSize& fileSize, cfdp::StringLv& sourceFileName,
-                                   size_t* maxOptionsLen) {
+                           cfdp::StringLv& destFileName)
-  this->optionsArray = optionsArray;
+    : fileSize(fileSize), sourceFileName(sourceFileName), destFileName(destFileName) {}
-  if (maxOptionsLen != nullptr) {
+
-    this->maxOptionsLen = *maxOptionsLen;
+void MetadataInfo::setOptionsArray(cfdp::Tlv** optionsArray_, std::optional<size_t> optionsLen_,
+                                   std::optional<size_t> maxOptionsLen_) {
+  this->optionsArray = optionsArray_;
+  if (maxOptionsLen_) {
+    this->maxOptionsLen = maxOptionsLen_.value();
   }
-  if (optionsLen != nullptr) {
+  if (optionsLen_) {
-    this->optionsLen = *optionsLen;
+    this->optionsLen = optionsLen_.value();
   }
 }
 
 cfdp::ChecksumType MetadataInfo::getChecksumType() const { return checksumType; }
 
-void MetadataInfo::setChecksumType(cfdp::ChecksumType checksumType) {
+void MetadataInfo::setChecksumType(cfdp::ChecksumType checksumType_) {
-  this->checksumType = checksumType;
+  checksumType = checksumType_;
 }
 
 bool MetadataInfo::isClosureRequested() const { return closureRequested; }
 
-void MetadataInfo::setClosureRequested(bool closureRequested) {
+void MetadataInfo::setClosureRequested(bool closureRequested_) {
-  this->closureRequested = closureRequested;
+  closureRequested = closureRequested_;
 }
 
-cfdp::Lv& MetadataInfo::getDestFileName() { return destFileName; }
+cfdp::StringLv& MetadataInfo::getDestFileName() { return destFileName; }
 
 cfdp::FileSize& MetadataInfo::getFileSize() { return fileSize; }
 
-ReturnValue_t MetadataInfo::getOptions(cfdp::Tlv*** optionsArray, size_t* optionsLen,
+ReturnValue_t MetadataInfo::getOptions(cfdp::Tlv*** optionsArray_, size_t* optionsLen_,
                                        size_t* maxOptsLen) {
-  if (optionsArray == nullptr or this->optionsArray == nullptr) {
+  if (optionsArray_ == nullptr or optionsArray == nullptr) {
     return returnvalue::FAILED;
   }
-  *optionsArray = this->optionsArray;
+  *optionsArray_ = optionsArray;
-  if (optionsLen != nullptr) {
+  if (optionsLen_ != nullptr) {
-    *optionsLen = this->optionsLen;
+    *optionsLen_ = this->optionsLen;
   }
   if (maxOptsLen != nullptr) {
     *maxOptsLen = this->maxOptionsLen;
@@ -81,18 +84,20 @@ size_t MetadataInfo::getSerializedSize(bool fssLarge) {
   return size;
 }
 
-void MetadataInfo::setDestFileName(cfdp::Lv& destFileName) { this->destFileName = destFileName; }
+void MetadataInfo::setDestFileName(cfdp::StringLv& destFileName_) {
+  this->destFileName = destFileName_;
+}
 
-void MetadataInfo::setSourceFileName(cfdp::Lv& sourceFileName) {
+void MetadataInfo::setSourceFileName(cfdp::StringLv& sourceFileName_) {
-  this->sourceFileName = sourceFileName;
+  this->sourceFileName = sourceFileName_;
 }
 
 size_t MetadataInfo::getMaxOptionsLen() const { return maxOptionsLen; }
 
-void MetadataInfo::setMaxOptionsLen(size_t maxOptionsLen) { this->maxOptionsLen = maxOptionsLen; }
+void MetadataInfo::setMaxOptionsLen(size_t maxOptionsLen_) { this->maxOptionsLen = maxOptionsLen_; }
 
 size_t MetadataInfo::getOptionsLen() const { return optionsLen; }
 
-void MetadataInfo::setOptionsLen(size_t optionsLen) { this->optionsLen = optionsLen; }
+void MetadataInfo::setOptionsLen(size_t optionsLen_) { this->optionsLen = optionsLen_; }
 
-cfdp::Lv& MetadataInfo::getSourceFileName() { return sourceFileName; }
+cfdp::StringLv& MetadataInfo::getSourceFileName() { return sourceFileName; }

src/fsfw/cfdp/pdu/MetadataInfo.h

@@ -1,45 +1,51 @@
 #ifndef FSFW_SRC_FSFW_CFDP_PDU_METADATAINFO_H_
 #define FSFW_SRC_FSFW_CFDP_PDU_METADATAINFO_H_
 
+#include <optional>
+
 #include "fsfw/cfdp/FileSize.h"
 #include "fsfw/cfdp/definitions.h"
 #include "fsfw/cfdp/tlv/Lv.h"
+#include "fsfw/cfdp/tlv/StringLv.h"
 #include "fsfw/cfdp/tlv/Tlv.h"
 
 class MetadataInfo {
  public:
+  MetadataInfo(cfdp::FileSize& fileSize, cfdp::StringLv& sourceFileName,
+               cfdp::StringLv& destFileName);
   MetadataInfo(bool closureRequested, cfdp::ChecksumType checksumType, cfdp::FileSize& fileSize,
-               cfdp::Lv& sourceFileName, cfdp::Lv& destFileName);
+               cfdp::StringLv& sourceFileName, cfdp::StringLv& destFileName);
 
   size_t getSerializedSize(bool fssLarge = false);
 
-  void setOptionsArray(cfdp::Tlv** optionsArray, size_t* optionsLen, size_t* maxOptionsLen);
+  void setOptionsArray(cfdp::Tlv** optionsArray, std::optional<size_t> optionsLen,
-  cfdp::ChecksumType getChecksumType() const;
+                       std::optional<size_t> maxOptionsLen);
+  [[nodiscard]] cfdp::ChecksumType getChecksumType() const;
   void setChecksumType(cfdp::ChecksumType checksumType);
-  bool isClosureRequested() const;
+  [[nodiscard]] bool isClosureRequested() const;
   void setClosureRequested(bool closureRequested = false);
 
-  void setDestFileName(cfdp::Lv& destFileName);
+  void setDestFileName(cfdp::StringLv& destFileName);
-  void setSourceFileName(cfdp::Lv& sourceFileName);
+  void setSourceFileName(cfdp::StringLv& sourceFileName);
 
-  cfdp::Lv& getDestFileName();
+  cfdp::StringLv& getDestFileName();
-  cfdp::Lv& getSourceFileName();
+  cfdp::StringLv& getSourceFileName();
   cfdp::FileSize& getFileSize();
 
-  bool hasOptions() const;
+  [[nodiscard]] bool hasOptions() const;
-  bool canHoldOptions() const;
+  [[nodiscard]] bool canHoldOptions() const;
   ReturnValue_t getOptions(cfdp::Tlv*** optionsArray, size_t* optionsLen, size_t* maxOptsLen);
   void setOptionsLen(size_t optionsLen);
-  size_t getOptionsLen() const;
+  [[nodiscard]] size_t getOptionsLen() const;
   void setMaxOptionsLen(size_t maxOptionsLen);
-  size_t getMaxOptionsLen() const;
+  [[nodiscard]] size_t getMaxOptionsLen() const;
 
  private:
   bool closureRequested = false;
-  cfdp::ChecksumType checksumType;
+  cfdp::ChecksumType checksumType = cfdp::ChecksumType::NULL_CHECKSUM;
   cfdp::FileSize& fileSize;
-  cfdp::Lv& sourceFileName;
+  cfdp::StringLv& sourceFileName;
-  cfdp::Lv& destFileName;
+  cfdp::StringLv& destFileName;
 
   cfdp::Tlv** optionsArray = nullptr;
   size_t optionsLen = 0;

src/fsfw/cfdp/pdu/MetadataPduCreator.cpp

@@ -1,22 +1,21 @@
-#include "MetadataPduSerializer.h"
+#include "MetadataPduCreator.h"
 
-MetadataPduSerializer::MetadataPduSerializer(PduConfig &conf, MetadataInfo &info)
+MetadataPduCreator::MetadataPduCreator(PduConfig &conf, MetadataInfo &info)
-    : FileDirectiveSerializer(conf, cfdp::FileDirectives::METADATA, 5), info(info) {
+    : FileDirectiveCreator(conf, cfdp::FileDirective::METADATA, 5), info(info) {
   updateDirectiveFieldLen();
 }
 
-void MetadataPduSerializer::updateDirectiveFieldLen() {
+void MetadataPduCreator::updateDirectiveFieldLen() {
   setDirectiveDataFieldLen(info.getSerializedSize(getLargeFileFlag()));
 }
 
-size_t MetadataPduSerializer::getSerializedSize() const {
+size_t MetadataPduCreator::getSerializedSize() const {
-  return FileDirectiveSerializer::getWholePduSize();
+  return FileDirectiveCreator::getWholePduSize();
 }
 
-ReturnValue_t MetadataPduSerializer::serialize(uint8_t **buffer, size_t *size, size_t maxSize,
+ReturnValue_t MetadataPduCreator::serialize(uint8_t **buffer, size_t *size, size_t maxSize,
-                                               Endianness streamEndianness) const {
+                                            Endianness streamEndianness) const {
-  ReturnValue_t result =
+  ReturnValue_t result = FileDirectiveCreator::serialize(buffer, size, maxSize, streamEndianness);
-      FileDirectiveSerializer::serialize(buffer, size, maxSize, streamEndianness);
   if (result != returnvalue::OK) {
     return result;
   }

src/fsfw/cfdp/pdu/MetadataPduCreator.h

@@ -0,0 +1,23 @@
+#ifndef FSFW_CFDP_PDU_METADATAPDUCREATOR_H_
+#define FSFW_CFDP_PDU_METADATAPDUCREATOR_H_
+
+#include "fsfw/cfdp/pdu/FileDirectiveCreator.h"
+#include "fsfw/cfdp/pdu/MetadataInfo.h"
+
+class MetadataPduCreator : public FileDirectiveCreator {
+ public:
+  MetadataPduCreator(PduConfig& conf, MetadataInfo& info);
+
+  void updateDirectiveFieldLen();
+
+  [[nodiscard]] size_t getSerializedSize() const override;
+
+  ReturnValue_t serialize(uint8_t** buffer, size_t* size, size_t maxSize,
+                          Endianness streamEndianness) const override;
+  using FileDirectiveCreator::serialize;
+
+ private:
+  MetadataInfo& info;
+};
+
+#endif /* FSFW_CFDP_PDU_METADATAPDUCREATOR_H_ */

src/fsfw/cfdp/pdu/MetadataPduDeserializer.h

@@ -1,17 +0,0 @@
-#ifndef FSFW_SRC_FSFW_CFDP_PDU_METADATAPDUDESERIALIZER_H_
-#define FSFW_SRC_FSFW_CFDP_PDU_METADATAPDUDESERIALIZER_H_
-
-#include "fsfw/cfdp/pdu/FileDirectiveDeserializer.h"
-#include "fsfw/cfdp/pdu/MetadataInfo.h"
-
-class MetadataPduDeserializer : public FileDirectiveDeserializer {
- public:
-  MetadataPduDeserializer(const uint8_t* pduBuf, size_t maxSize, MetadataInfo& info);
-
-  ReturnValue_t parseData() override;
-
- private:
-  MetadataInfo& info;
-};
-
-#endif /* FSFW_SRC_FSFW_CFDP_PDU_METADATAPDUDESERIALIZER_H_ */

src/fsfw/cfdp/pdu/MetadataPduReader.cpp

@@ -1,17 +1,16 @@
-#include "MetadataPduDeserializer.h"
+#include "MetadataPduReader.h"
 
-MetadataPduDeserializer::MetadataPduDeserializer(const uint8_t* pduBuf, size_t maxSize,
+MetadataPduReader::MetadataPduReader(const uint8_t* pduBuf, size_t maxSize, MetadataInfo& info)
-                                                 MetadataInfo& info)
+    : FileDirectiveReader(pduBuf, maxSize), info(info) {}
-    : FileDirectiveDeserializer(pduBuf, maxSize), info(info) {}
 
-ReturnValue_t MetadataPduDeserializer::parseData() {
+ReturnValue_t MetadataPduReader::parseData() {
-  ReturnValue_t result = FileDirectiveDeserializer::parseData();
+  ReturnValue_t result = FileDirectiveReader::parseData();
   if (result != returnvalue::OK) {
     return result;
   }
-  size_t currentIdx = FileDirectiveDeserializer::getHeaderSize();
+  size_t currentIdx = FileDirectiveReader::getHeaderSize();
-  const uint8_t* buf = rawPtr + currentIdx;
+  const uint8_t* buf = pointers.rawPtr + currentIdx;
-  size_t remSize = FileDirectiveDeserializer::getWholePduSize() - currentIdx;
+  size_t remSize = FileDirectiveReader::getWholePduSize() - currentIdx;
   if (remSize < 1) {
     return SerializeIF::STREAM_TOO_SHORT;
   }

src/fsfw/cfdp/pdu/MetadataPduReader.h

@@ -0,0 +1,17 @@
+#ifndef FSFW_CFDP_PDU_METADATAPDUREADER_H_
+#define FSFW_CFDP_PDU_METADATAPDUREADER_H_
+
+#include "fsfw/cfdp/pdu/FileDirectiveReader.h"
+#include "fsfw/cfdp/pdu/MetadataInfo.h"
+
+class MetadataPduReader : public FileDirectiveReader {
+ public:
+  MetadataPduReader(const uint8_t* pduBuf, size_t maxSize, MetadataInfo& info);
+
+  ReturnValue_t parseData() override;
+
+ private:
+  MetadataInfo& info;
+};
+
+#endif /* FSFW_CFDP_PDU_METADATAPDUREADER_H_ */

src/fsfw/cfdp/pdu/MetadataPduSerializer.h

@@ -1,22 +0,0 @@
-#ifndef FSFW_SRC_FSFW_CFDP_PDU_METADATAPDUSERIALIZER_H_
-#define FSFW_SRC_FSFW_CFDP_PDU_METADATAPDUSERIALIZER_H_
-
-#include "fsfw/cfdp/pdu/FileDirectiveSerializer.h"
-#include "fsfw/cfdp/pdu/MetadataInfo.h"
-
-class MetadataPduSerializer : public FileDirectiveSerializer {
- public:
-  MetadataPduSerializer(PduConfig& conf, MetadataInfo& info);
-
-  void updateDirectiveFieldLen();
-
-  size_t getSerializedSize() const override;
-
-  ReturnValue_t serialize(uint8_t** buffer, size_t* size, size_t maxSize,
-                          Endianness streamEndianness) const override;
-
- private:
-  MetadataInfo& info;
-};
-
-#endif /* FSFW_SRC_FSFW_CFDP_PDU_METADATAPDUSERIALIZER_H_ */

src/fsfw/cfdp/pdu/NakInfo.cpp

@@ -26,7 +26,7 @@ bool NakInfo::hasSegmentRequests() const {
 }
 
 bool NakInfo::canHoldSegmentRequests() const {
-  if (this->segmentRequests != nullptr and maxSegmentRequestsLen > 0) {
+  if (segmentRequests != nullptr and maxSegmentRequestsLen > 0) {
     return true;
   }
   return false;

src/fsfw/cfdp/pdu/NakPduCreator.cpp

@@ -1,22 +1,19 @@
-#include "NakPduSerializer.h"
+#include "NakPduCreator.h"
 
-NakPduSerializer::NakPduSerializer(PduConfig &pduConf, NakInfo &nakInfo)
+NakPduCreator::NakPduCreator(PduConfig &pduConf, NakInfo &nakInfo)
-    : FileDirectiveSerializer(pduConf, cfdp::FileDirectives::NAK, 0), nakInfo(nakInfo) {
+    : FileDirectiveCreator(pduConf, cfdp::FileDirective::NAK, 0), nakInfo(nakInfo) {
   updateDirectiveFieldLen();
 }
 
-void NakPduSerializer::updateDirectiveFieldLen() {
+void NakPduCreator::updateDirectiveFieldLen() {
   this->setDirectiveDataFieldLen(nakInfo.getSerializedSize(getLargeFileFlag()));
 }
 
-size_t NakPduSerializer::getSerializedSize() const {
+size_t NakPduCreator::getSerializedSize() const { return FileDirectiveCreator::getWholePduSize(); }
-  return FileDirectiveSerializer::getWholePduSize();
-}
 
-ReturnValue_t NakPduSerializer::serialize(uint8_t **buffer, size_t *size, size_t maxSize,
+ReturnValue_t NakPduCreator::serialize(uint8_t **buffer, size_t *size, size_t maxSize,
-                                          Endianness streamEndianness) const {
+                                       Endianness streamEndianness) const {
-  ReturnValue_t result =
+  ReturnValue_t result = FileDirectiveCreator::serialize(buffer, size, maxSize, streamEndianness);
-      FileDirectiveSerializer::serialize(buffer, size, maxSize, streamEndianness);
   if (result != returnvalue::OK) {
     return result;
   }

src/fsfw/cfdp/pdu/NakPduCreator.h

@@ -1,14 +1,14 @@
-#ifndef FSFW_SRC_FSFW_CFDP_PDU_NAKPDUSERIALIZER_H_
+#ifndef FSFW_CFDP_PDU_NAKPDUSERIALIZER_H_
-#define FSFW_SRC_FSFW_CFDP_PDU_NAKPDUSERIALIZER_H_
+#define FSFW_CFDP_PDU_NAKPDUSERIALIZER_H_
 
 #include <vector>
 
 #include "NakInfo.h"
 #include "fsfw/cfdp/FileSize.h"
 #include "fsfw/cfdp/definitions.h"
-#include "fsfw/cfdp/pdu/FileDirectiveSerializer.h"
+#include "fsfw/cfdp/pdu/FileDirectiveCreator.h"
 
-class NakPduSerializer : public FileDirectiveSerializer {
+class NakPduCreator : public FileDirectiveCreator {
  public:
   /**
    *
@@ -18,9 +18,9 @@ class NakPduSerializer : public FileDirectiveSerializer {
    * @param [in] segmentRequests Pointer to the start of a list of segment requests
    * @param segmentRequestLen Length of the segment request list to be serialized
    */
-  NakPduSerializer(PduConfig& PduConf, NakInfo& nakInfo);
+  NakPduCreator(PduConfig& PduConf, NakInfo& nakInfo);
 
-  size_t getSerializedSize() const override;
+  [[nodiscard]] size_t getSerializedSize() const override;
 
   ReturnValue_t serialize(uint8_t** buffer, size_t* size, size_t maxSize,
                           Endianness streamEndianness) const override;
@@ -35,4 +35,4 @@ class NakPduSerializer : public FileDirectiveSerializer {
   NakInfo& nakInfo;
 };
 
-#endif /* FSFW_SRC_FSFW_CFDP_PDU_NAKPDUSERIALIZER_H_ */
+#endif /* FSFW_CFDP_PDU_NAKPDUSERIALIZER_H_ */

src/fsfw/cfdp/pdu/NakPduDeserializer.h

@@ -1,21 +0,0 @@
-#ifndef FSFW_SRC_FSFW_CFDP_PDU_NAKPDUDESERIALIZER_H_
-#define FSFW_SRC_FSFW_CFDP_PDU_NAKPDUDESERIALIZER_H_
-
-#include "fsfw/cfdp/pdu/FileDirectiveDeserializer.h"
-#include "fsfw/cfdp/pdu/NakInfo.h"
-
-class NakPduDeserializer : public FileDirectiveDeserializer {
- public:
-  NakPduDeserializer(const uint8_t* pduBuf, size_t maxSize, NakInfo& info);
-
-  /**
-   * This needs to be called before accessing the PDU fields to avoid segmentation faults.
-   * @return
-   */
-  virtual ReturnValue_t parseData() override;
-
- private:
-  NakInfo& nakInfo;
-};
-
-#endif /* FSFW_SRC_FSFW_CFDP_PDU_NAKPDUDESERIALIZER_H_ */

src/fsfw/cfdp/pdu/NakPduReader.cpp

@@ -1,16 +1,16 @@
-#include "NakPduDeserializer.h"
+#include "NakPduReader.h"
 
-NakPduDeserializer::NakPduDeserializer(const uint8_t* pduBuf, size_t maxSize, NakInfo& info)
+NakPduReader::NakPduReader(const uint8_t* pduBuf, size_t maxSize, NakInfo& info)
-    : FileDirectiveDeserializer(pduBuf, maxSize), nakInfo(info) {}
+    : FileDirectiveReader(pduBuf, maxSize), nakInfo(info) {}
 
-ReturnValue_t NakPduDeserializer::parseData() {
+ReturnValue_t NakPduReader::parseData() {
-  ReturnValue_t result = FileDirectiveDeserializer::parseData();
+  ReturnValue_t result = FileDirectiveReader::parseData();
   if (result != returnvalue::OK) {
     return result;
   }
-  size_t currentIdx = FileDirectiveDeserializer::getHeaderSize();
+  size_t currentIdx = FileDirectiveReader::getHeaderSize();
-  const uint8_t* buffer = rawPtr + currentIdx;
+  const uint8_t* buffer = pointers.rawPtr + currentIdx;
-  size_t remSize = FileDirectiveDeserializer::getWholePduSize() - currentIdx;
+  size_t remSize = FileDirectiveReader::getWholePduSize() - currentIdx;
   if (remSize < 1) {
     return SerializeIF::STREAM_TOO_SHORT;
   }