Merge pull request 'Bump FSFW' (#31) from bump-fsfw into develop

Reviewed-on: #31

.gitignore

@@ -1,5 +1,5 @@
 # PyCharm and CLion
-/.idea/*
+.idea/*
 !/.idea/runConfigurations
 !/.idea/cmake.xml
 !/.idea/codeStyles

.idea/cmake.xml

@@ -2,7 +2,7 @@
 <project version="4">
   <component name="CMakeSharedSettings">
     <configurations>
-      <configuration PROFILE_NAME="Debug Test" ENABLED="true" CONFIG_NAME="Debug" GENERATION_OPTIONS="-DFSFW_BUILD_TESTS=ON -DFSFW_OSAL=host" />
+      <configuration PROFILE_NAME="Debug Test" ENABLED="true" CONFIG_NAME="Debug" GENERATION_OPTIONS="-DFSFW_OSAL=host -DFSFW_BUILD_TESTS=ON" NO_GENERATOR="true" />
     </configurations>
   </component>
 </project>

src/fsfw/CMakeLists.txt

@@ -32,6 +32,7 @@ add_subdirectory(timemanager)
 add_subdirectory(tmtcpacket)
 add_subdirectory(tmtcservices)
 add_subdirectory(filesystem)
+add_subdirectory(util)
 
 # Optional
 

src/fsfw/cfdp/CfdpMessage.cpp

@@ -4,8 +4,9 @@ CfdpMessage::CfdpMessage() = default;
 
 CfdpMessage::~CfdpMessage() = default;
 
-void CfdpMessage::setCommand(CommandMessage *message, store_address_t cfdpPacket) {
+void CfdpMessage::setPutRequest(CommandMessage *message, store_address_t putRequest) {
-  message->setParameter(cfdpPacket.raw);
+  message->setCommand(PUT_REQUEST);
+  message->setParameter(putRequest.raw);
 }
 
 store_address_t CfdpMessage::getStoreId(const CommandMessage *message) {

src/fsfw/cfdp/CfdpMessage.h

@@ -11,9 +11,11 @@ class CfdpMessage {
 
  public:
   static const uint8_t MESSAGE_ID = messagetypes::CFDP;
+  static const Command_t PUT_REQUEST = MAKE_COMMAND_ID(1);
+  static const Command_t CANCEL_REQUEST = MAKE_COMMAND_ID(1);
 
   virtual ~CfdpMessage();
-  static void setCommand(CommandMessage* message, store_address_t cfdpPacket);
+  static void setPutRequest(CommandMessage* message, store_address_t putRequest);
 
   static store_address_t getStoreId(const CommandMessage* message);
 

src/fsfw/cfdp/Fss.h

@@ -8,11 +8,14 @@
 
 namespace cfdp {
 
-struct FileSize : public SerializeIF {
+/**
+ * Helper type for the CFDP File Size Sensitive (FSS) fields.
+ */
+struct Fss : public SerializeIF {
  public:
-  FileSize() = default;
+  Fss() = default;
 
-  explicit FileSize(uint64_t fileSize, bool isLarge = false) { setFileSize(fileSize, isLarge); };
+  explicit Fss(uint64_t fileSize, bool isLarge = false) { setFileSize(fileSize, isLarge); };
 
   [[nodiscard]] uint64_t value() const { return fileSize; }
 

src/fsfw/cfdp/VarLenFields.cpp

@@ -3,8 +3,8 @@
 #include "fsfw/serialize/SerializeAdapter.h"
 #include "fsfw/serviceinterface.h"
 
-cfdp::VarLenField::VarLenField(cfdp::WidthInBytes width, size_t value) : VarLenField() {
+cfdp::VarLenField::VarLenField(cfdp::WidthInBytes width, uint64_t value) : VarLenField() {
-  ReturnValue_t result = this->setValue(width, value);
+  ReturnValue_t result = this->setValueAndWidth(width, value);
   if (result != returnvalue::OK) {
 #if FSFW_DISABLE_PRINTOUT == 0
 #if FSFW_CPP_OSTREAM_ENABLED == 1
@@ -20,8 +20,8 @@ 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::setValueAndWidth(cfdp::WidthInBytes width_, uint64_t value_) {
-  switch (widthInBytes) {
+  switch (width_) {
     case (cfdp::WidthInBytes::ONE_BYTE): {
       if (value_ > UINT8_MAX) {
         return returnvalue::FAILED;
@@ -43,15 +43,18 @@ ReturnValue_t cfdp::VarLenField::setValue(cfdp::WidthInBytes widthInBytes, size_
       this->value.fourBytes = value_;
       break;
     }
+    case (cfdp::WidthInBytes::EIGHT_BYTES): {
+      this->value.eightBytes = value_;
+    }
     default: {
       break;
     }
   }
-  this->width = widthInBytes;
+  this->width = width_;
   return returnvalue::OK;
 }
 
-size_t cfdp::VarLenField::getValue() const {
+uint64_t cfdp::VarLenField::getValue() const {
   switch (width) {
     case (cfdp::WidthInBytes::ONE_BYTE): {
       return value.oneByte;
@@ -62,6 +65,9 @@ size_t cfdp::VarLenField::getValue() const {
     case (cfdp::WidthInBytes::FOUR_BYTES): {
       return value.fourBytes;
     }
+    case (cfdp::WidthInBytes::EIGHT_BYTES): {
+      return value.eightBytes;
+    }
   }
   return 0;
 }
@@ -84,6 +90,10 @@ ReturnValue_t cfdp::VarLenField::serialize(uint8_t **buffer, size_t *size, size_
     case (cfdp::WidthInBytes::FOUR_BYTES): {
       return SerializeAdapter::serialize(&value.fourBytes, buffer, size, maxSize, streamEndianness);
     }
+    case (cfdp::WidthInBytes::EIGHT_BYTES): {
+      return SerializeAdapter::serialize(&value.eightBytes, buffer, size, maxSize,
+                                         streamEndianness);
+    }
     default: {
       return returnvalue::FAILED;
     }
@@ -98,11 +108,16 @@ ReturnValue_t cfdp::VarLenField::deSerialize(cfdp::WidthInBytes width_, const ui
   return deSerialize(buffer, size, streamEndianness);
 }
 
+ReturnValue_t cfdp::VarLenField::setValue(uint64_t value_) {
+  return setValueAndWidth(getWidth(), value_);
+}
+
 ReturnValue_t cfdp::VarLenField::deSerialize(const uint8_t **buffer, size_t *size,
                                              Endianness streamEndianness) {
   switch (width) {
     case (cfdp::WidthInBytes::ONE_BYTE): {
       value.oneByte = **buffer;
+      *buffer += 1;
       *size += 1;
       return returnvalue::OK;
     }
@@ -112,6 +127,9 @@ ReturnValue_t cfdp::VarLenField::deSerialize(const uint8_t **buffer, size_t *siz
     case (cfdp::WidthInBytes::FOUR_BYTES): {
       return SerializeAdapter::deSerialize(&value.fourBytes, buffer, size, streamEndianness);
     }
+    case (cfdp::WidthInBytes::EIGHT_BYTES): {
+      return SerializeAdapter::deSerialize(&value.eightBytes, buffer, size, streamEndianness);
+    }
     default: {
       return returnvalue::FAILED;
     }
@@ -135,3 +153,5 @@ bool cfdp::VarLenField::operator==(const cfdp::VarLenField &other) const {
 bool cfdp::VarLenField::operator!=(const cfdp::VarLenField &other) const {
   return not(*this == other);
 }
+
+void cfdp::VarLenField::setWidth(cfdp::WidthInBytes width_) { this->width = width_; }

src/fsfw/cfdp/VarLenFields.h

@@ -25,13 +25,15 @@ class VarLenField : public SerializeIF {
   template <typename T>
   explicit VarLenField(UnsignedByteField<T> byteField);
 
-  VarLenField(cfdp::WidthInBytes width, size_t value);
+  VarLenField(cfdp::WidthInBytes width, uint64_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 setValueAndWidth(cfdp::WidthInBytes width, uint64_t value);
+  void setWidth(cfdp::WidthInBytes width);
+  ReturnValue_t setValue(uint64_t value);
 
   ReturnValue_t serialize(uint8_t **buffer, size_t *size, size_t maxSize,
                           Endianness streamEndianness) const override;
@@ -42,7 +44,7 @@ class VarLenField : public SerializeIF {
                             Endianness streamEndianness);
 
   [[nodiscard]] cfdp::WidthInBytes getWidth() const;
-  [[nodiscard]] size_t getValue() const;
+  [[nodiscard]] uint64_t getValue() const;
 
 #if FSFW_CPP_OSTREAM_ENABLED == 1
   friend std::ostream &operator<<(std::ostream &os, const VarLenField &id) {
@@ -65,7 +67,7 @@ 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());
+  setValueAndWidth(width, byteField.getValue());
 }
 
 struct EntityId : public VarLenField {
@@ -74,6 +76,32 @@ struct EntityId : public VarLenField {
   template <typename T>
   explicit EntityId(UnsignedByteField<T> byteField) : VarLenField(byteField) {}
   EntityId(cfdp::WidthInBytes width, size_t entityId) : VarLenField(width, entityId) {}
+
+  ReturnValue_t serializeAsLv(uint8_t **buffer, size_t *size, size_t maxSize) const {
+    if (buffer == nullptr or size == nullptr) {
+      return returnvalue::FAILED;
+    }
+    if (*size + 1 + getWidth() > maxSize) {
+      return SerializeIF::BUFFER_TOO_SHORT;
+    }
+    **buffer = getWidth();
+    *buffer += 1;
+    *size += 1;
+    return serialize(buffer, size, maxSize, SerializeIF::Endianness::NETWORK);
+  }
+
+  ReturnValue_t deSerializeFromLv(const uint8_t **buffer, size_t *deserLen) {
+    if (buffer == nullptr or deserLen == nullptr) {
+      return returnvalue::FAILED;
+    }
+    if (*deserLen < 2) {
+      return SerializeIF::STREAM_TOO_SHORT;
+    }
+    auto width = static_cast<WidthInBytes>(**buffer);
+    *buffer += 1;
+    *deserLen -= 1;
+    return VarLenField::deSerialize(width, buffer, deserLen, SerializeIF::Endianness::NETWORK);
+  }
 };
 
 struct TransactionSeqNum : public VarLenField {

src/fsfw/cfdp/definitions.h

@@ -17,7 +17,7 @@ static constexpr char CFDP_VERSION_2_NAME[] = "CCSDS 727.0-B-5";
 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 uint8_t CFDP_CLASS_ID = CLASS_ID::CFDP_BASE;
 
 static constexpr ReturnValue_t INVALID_TLV_TYPE = returnvalue::makeCode(CFDP_CLASS_ID, 1);
 static constexpr ReturnValue_t INVALID_DIRECTIVE_FIELD = returnvalue::makeCode(CFDP_CLASS_ID, 2);
@@ -68,6 +68,7 @@ enum WidthInBytes : uint8_t {
   ONE_BYTE = 1,
   TWO_BYTES = 2,
   FOUR_BYTES = 4,
+  EIGHT_BYTES = 8
 };
 
 enum FileDirective : uint8_t {
@@ -142,6 +143,20 @@ enum RecordContinuationState {
   CONTAINS_START_AND_END = 0b11
 };
 
+enum class ProxyOpMessageType : uint8_t {
+  PUT_REQUEST = 0x00,
+  MSG_TO_USR = 0x01,
+  FS_REQUEST = 0x02,
+  FAULT_HANDLER_OVERRIDE = 0x03,
+  TRANSMISSION_MODE = 0x04,
+  FLOW_LABEL = 0x05,
+  SEG_CTRL = 0x06,
+  PUT_RESPONSE = 0x07,
+  FS_RESPONSE = 0x08,
+  PUT_CANCEL = 0x09,
+  CLOSURE = 0x0b
+};
+
 }  // namespace cfdp
 
 #endif /* FSFW_SRC_FSFW_CFDP_PDU_DEFINITIONS_H_ */

src/fsfw/cfdp/handler/CMakeLists.txt

@@ -1,2 +1,4 @@
-target_sources(${LIB_FSFW_NAME} PRIVATE SourceHandler.cpp DestHandler.cpp
+target_sources(
-                                        FaultHandlerBase.cpp UserBase.cpp)
+  ${LIB_FSFW_NAME}
+  PRIVATE SourceHandler.cpp DestHandler.cpp PutRequest.cpp
+          ReservedMessageParser.cpp FaultHandlerBase.cpp UserBase.cpp)

src/fsfw/cfdp/handler/DestHandler.cpp

@@ -16,25 +16,26 @@ using namespace returnvalue;
 
 cfdp::DestHandler::DestHandler(DestHandlerParams params, FsfwParams fsfwParams)
     : tlvVec(params.maxTlvsInOnePdu),
-      userTlvVec(params.maxTlvsInOnePdu),
+      msgToUserVec(params.maxTlvsInOnePdu),
-      dp(std::move(params)),
+      transactionParams(params.maxFilenameLen),
-      fp(fsfwParams),
+      destParams(std::move(params)),
-      tp(params.maxFilenameLen) {
+      fsfwParams(fsfwParams) {
-  tp.pduConf.direction = cfdp::Direction::TOWARDS_SENDER;
+  transactionParams.pduConf.direction = cfdp::Direction::TOWARDS_SENDER;
 }
 
-const cfdp::DestHandler::FsmResult& cfdp::DestHandler::performStateMachine() {
+const cfdp::DestHandler::FsmResult& cfdp::DestHandler::stateMachine() {
   ReturnValue_t result;
   uint8_t errorIdx = 0;
   fsmRes.resetOfIteration();
   if (fsmRes.step == TransactionStep::IDLE) {
-    for (auto infoIter = dp.packetListRef.begin(); infoIter != dp.packetListRef.end();) {
+    for (auto infoIter = destParams.packetListRef.begin();
+         infoIter != destParams.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++);
+        destParams.packetListRef.erase(infoIter++);
       } else {
         infoIter++;
       }
@@ -42,11 +43,12 @@ const cfdp::DestHandler::FsmResult& cfdp::DestHandler::performStateMachine() {
     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();) {
+      for (auto infoIter = destParams.packetListRef.begin();
-        fp.tcStore->deleteData(infoIter->storeId);
+           infoIter != destParams.packetListRef.end();) {
+        fsfwParams.tcStore->deleteData(infoIter->storeId);
         infoIter++;
       }
-      dp.packetListRef.clear();
+      destParams.packetListRef.clear();
     }
 
     if (fsmRes.step != TransactionStep::IDLE) {
@@ -54,21 +56,22 @@ const cfdp::DestHandler::FsmResult& cfdp::DestHandler::performStateMachine() {
     }
     return updateFsmRes(errorIdx);
   }
-  if (fsmRes.state == CfdpStates::BUSY_CLASS_1_NACKED) {
+  if (fsmRes.state == CfdpState::BUSY_CLASS_1_NACKED) {
     if (fsmRes.step == TransactionStep::RECEIVING_FILE_DATA_PDUS) {
-      for (auto infoIter = dp.packetListRef.begin(); infoIter != dp.packetListRef.end();) {
+      for (auto infoIter = destParams.packetListRef.begin();
+           infoIter != destParams.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++);
+          destParams.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++);
+          destParams.packetListRef.erase(infoIter++);
         } else {
           infoIter++;
         }
@@ -85,7 +88,7 @@ const cfdp::DestHandler::FsmResult& cfdp::DestHandler::performStateMachine() {
     }
     return updateFsmRes(errorIdx);
   }
-  if (fsmRes.state == CfdpStates::BUSY_CLASS_2_ACKED) {
+  if (fsmRes.state == CfdpState::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;
@@ -95,29 +98,29 @@ const cfdp::DestHandler::FsmResult& cfdp::DestHandler::performStateMachine() {
 }
 
 ReturnValue_t cfdp::DestHandler::passPacket(PacketInfo packet) {
-  if (dp.packetListRef.full()) {
+  if (destParams.packetListRef.full()) {
     return FAILED;
   }
-  dp.packetListRef.push_back(packet);
+  destParams.packetListRef.push_back(packet);
   return OK;
 }
 
 ReturnValue_t cfdp::DestHandler::initialize() {
-  if (fp.tmStore == nullptr) {
+  if (fsfwParams.tmStore == nullptr) {
-    fp.tmStore = ObjectManager::instance()->get<StorageManagerIF>(objects::TM_STORE);
+    fsfwParams.tmStore = ObjectManager::instance()->get<StorageManagerIF>(objects::TM_STORE);
-    if (fp.tmStore == nullptr) {
+    if (fsfwParams.tmStore == nullptr) {
       return FAILED;
     }
   }
 
-  if (fp.tcStore == nullptr) {
+  if (fsfwParams.tcStore == nullptr) {
-    fp.tcStore = ObjectManager::instance()->get<StorageManagerIF>(objects::TC_STORE);
+    fsfwParams.tcStore = ObjectManager::instance()->get<StorageManagerIF>(objects::TC_STORE);
-    if (fp.tcStore == nullptr) {
+    if (fsfwParams.tcStore == nullptr) {
       return FAILED;
     }
   }
 
-  if (fp.msgQueue == nullptr) {
+  if (fsfwParams.msgQueue == nullptr) {
     return FAILED;
   }
   return OK;
@@ -125,18 +128,16 @@ ReturnValue_t cfdp::DestHandler::initialize() {
 
 ReturnValue_t cfdp::DestHandler::handleMetadataPdu(const PacketInfo& info) {
   // Process metadata PDU
-  auto constAccessorPair = fp.tcStore->getData(info.storeId);
+  auto constAccessorPair = fsfwParams.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);
+  MetadataGenericInfo metadataInfo(transactionParams.fileSize);
-  cfdp::Tlv* tlvArrayAsPtr = tlvVec.data();
-  metadataInfo.setOptionsArray(&tlvArrayAsPtr, std::nullopt, tlvVec.size());
   MetadataPduReader reader(constAccessorPair.second.data(), constAccessorPair.second.size(),
-                           metadataInfo);
+                           metadataInfo, tlvVec.data(), tlvVec.size());
   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
@@ -145,18 +146,17 @@ ReturnValue_t cfdp::DestHandler::handleMetadataPdu(const PacketInfo& info) {
     return handleMetadataParseError(result, constAccessorPair.second.data(),
                                     constAccessorPair.second.size());
   }
-  return startTransaction(reader, metadataInfo);
+  return startTransaction(reader);
 }
 
 ReturnValue_t cfdp::DestHandler::handleFileDataPdu(const cfdp::PacketInfo& info) {
   // Process file data PDU
-  auto constAccessorPair = fp.tcStore->getData(info.storeId);
+  auto constAccessorPair = fsfwParams.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;
-  FileDataInfo fdInfo(offset);
   FileDataReader reader(constAccessorPair.second.data(), constAccessorPair.second.size(), fdInfo);
   ReturnValue_t result = reader.parseData();
   if (result != OK) {
@@ -164,46 +164,46 @@ ReturnValue_t cfdp::DestHandler::handleFileDataPdu(const cfdp::PacketInfo& info)
   }
   size_t fileSegmentLen = 0;
   const uint8_t* fileData = fdInfo.getFileData(&fileSegmentLen);
-  FileOpParams fileOpParams(tp.destName.data(), fileSegmentLen);
+  FileOpParams fileOpParams(transactionParams.destName.data(), fileSegmentLen);
-  fileOpParams.offset = offset.value();
+  fileOpParams.offset = fdInfo.getOffset().value();
-  if (dp.cfg.indicCfg.fileSegmentRecvIndicRequired) {
+  if (destParams.cfg.indicCfg.fileSegmentRecvIndicRequired) {
     FileSegmentRecvdParams segParams;
-    segParams.offset = offset.value();
+    segParams.offset = fdInfo.getOffset().value();
-    segParams.id = tp.transactionId;
+    segParams.id = transactionParams.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);
+    destParams.user.fileSegmentRecvdIndication(segParams);
   }
-  result = dp.user.vfs.writeToFile(fileOpParams, fileData);
+  result = destParams.user.vfs.writeToFile(fileOpParams, fileData);
   if (result != returnvalue::OK) {
     // TODO: Proper Error handling
 #if FSFW_CPP_OSTREAM_ENABLED == 1
     sif::error << "cfdp::DestHandler: VFS file write error with code 0x" << std::hex << std::setw(2)
                << result << std::endl;
 #endif
-    tp.vfsErrorCount++;
+    transactionParams.vfsErrorCount++;
-    if (tp.vfsErrorCount < 3) {
+    if (transactionParams.vfsErrorCount < 3) {
       // TODO: Provide execution step as parameter
-      fp.eventReporter->forwardEvent(events::FILESTORE_ERROR, static_cast<uint8_t>(fsmRes.step),
+      fsfwParams.eventReporter->forwardEvent(events::FILESTORE_ERROR,
-                                     result);
+                                             static_cast<uint8_t>(fsmRes.step), result);
     }
     return result;
   } else {
-    tp.deliveryStatus = FileDeliveryStatus::RETAINED_IN_FILESTORE;
+    transactionParams.deliveryStatus = FileDeliveryStatus::RETAINED_IN_FILESTORE;
-    tp.vfsErrorCount = 0;
+    transactionParams.vfsErrorCount = 0;
   }
-  if (offset.value() + fileSegmentLen > tp.progress) {
+  if (fdInfo.getOffset().value() + fileSegmentLen > transactionParams.progress) {
-    tp.progress = offset.value() + fileSegmentLen;
+    transactionParams.progress = fdInfo.getOffset().value() + fileSegmentLen;
   }
   return result;
 }
 
 ReturnValue_t cfdp::DestHandler::handleEofPdu(const cfdp::PacketInfo& info) {
   // Process EOF PDU
-  auto constAccessorPair = fp.tcStore->getData(info.storeId);
+  auto constAccessorPair = fsfwParams.tcStore->getData(info.storeId);
   if (constAccessorPair.first != OK) {
     // TODO: This is not a CFDP error. Event and/or warning?
     return constAccessorPair.first;
@@ -216,21 +216,21 @@ ReturnValue_t cfdp::DestHandler::handleEofPdu(const cfdp::PacketInfo& info) {
   }
   // TODO: Error handling
   if (eofInfo.getConditionCode() == ConditionCode::NO_ERROR) {
-    tp.crc = eofInfo.getChecksum();
+    transactionParams.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) {
+    if (fileSizeFromEof > transactionParams.progress) {
       // TODO: File size error
     }
-    tp.fileSize.setFileSize(fileSizeFromEof, std::nullopt);
+    transactionParams.fileSize.setFileSize(fileSizeFromEof, std::nullopt);
   }
-  if (dp.cfg.indicCfg.eofRecvIndicRequired) {
+  if (destParams.cfg.indicCfg.eofRecvIndicRequired) {
-    dp.user.eofRecvIndication(getTransactionId());
+    destParams.user.eofRecvIndication(getTransactionId());
   }
   if (fsmRes.step == TransactionStep::RECEIVING_FILE_DATA_PDUS) {
-    if (fsmRes.state == CfdpStates::BUSY_CLASS_1_NACKED) {
+    if (fsmRes.state == CfdpState::BUSY_CLASS_1_NACKED) {
       fsmRes.step = TransactionStep::TRANSFER_COMPLETION;
-    } else if (fsmRes.state == CfdpStates::BUSY_CLASS_2_ACKED) {
+    } else if (fsmRes.state == CfdpState::BUSY_CLASS_2_ACKED) {
       fsmRes.step = TransactionStep::SENDING_ACK_PDU;
     }
   }
@@ -260,7 +260,7 @@ ReturnValue_t cfdp::DestHandler::handleMetadataParseError(ReturnValue_t result,
   cfdp::EntityId destId;
   headerReader.getDestId(destId);
   RemoteEntityCfg* remoteCfg;
-  if (not dp.remoteCfgTable.getRemoteCfg(destId, &remoteCfg)) {
+  if (not destParams.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
@@ -274,51 +274,57 @@ ReturnValue_t cfdp::DestHandler::handleMetadataParseError(ReturnValue_t result,
   return returnvalue::FAILED;
 }
 
-ReturnValue_t cfdp::DestHandler::startTransaction(MetadataPduReader& reader, MetadataInfo& info) {
+ReturnValue_t cfdp::DestHandler::startTransaction(const MetadataPduReader& reader) {
-  if (fsmRes.state != CfdpStates::IDLE) {
+  if (fsmRes.state != CfdpState::IDLE) {
     // According to standard, discard metadata PDU if we are busy
     return OK;
   }
   ReturnValue_t result = OK;
   size_t sourceNameSize = 0;
 
-  const uint8_t* sourceNamePtr = info.getSourceFileName().getValue(&sourceNameSize);
+  if (not reader.getSourceFileName().isEmpty()) {
-  if (sourceNameSize + 1 > tp.sourceName.size()) {
+    const uint8_t* sourceNamePtr = reader.getSourceFileName().getValue(&sourceNameSize);
-    fileErrorHandler(events::FILENAME_TOO_LARGE_ERROR, 0, "source filename too large");
+    if (sourceNameSize + 1 > transactionParams.sourceName.size()) {
-    return FAILED;
+      fileErrorHandler(events::FILENAME_TOO_LARGE_ERROR, 0, "source filename too large");
+      return FAILED;
+    }
+    std::memcpy(transactionParams.sourceName.data(), sourceNamePtr, sourceNameSize);
+    transactionParams.sourceName[sourceNameSize] = '\0';
   }
-  std::memcpy(tp.sourceName.data(), sourceNamePtr, sourceNameSize);
-  tp.sourceName[sourceNameSize] = '\0';
   size_t destNameSize = 0;
-  const uint8_t* destNamePtr = info.getDestFileName().getValue(&destNameSize);
+  if (not reader.getDestFileName().isEmpty()) {
-  if (destNameSize + 1 > tp.destName.size()) {
+    const uint8_t* destNamePtr = reader.getDestFileName().getValue(&destNameSize);
-    fileErrorHandler(events::FILENAME_TOO_LARGE_ERROR, 0, "dest filename too large");
+    if (destNameSize + 1 > transactionParams.destName.size()) {
-    return FAILED;
+      fileErrorHandler(events::FILENAME_TOO_LARGE_ERROR, 0, "dest filename too large");
+      return FAILED;
+    }
+    std::memcpy(transactionParams.destName.data(), destNamePtr, destNameSize);
+    transactionParams.destName[destNameSize] = '\0';
   }
-  std::memcpy(tp.destName.data(), destNamePtr, destNameSize);
-  tp.destName[destNameSize] = '\0';
 
+  transactionParams.metadataOnly = true;
   // 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());
+    transactionParams.metadataOnly = false;
+    FilesystemParams fparams(transactionParams.destName.data());
     // handling to allow only specifying target directory. Example:
     // Source path /test/hello.txt, dest path /tmp -> dest path /tmp/hello.txt
-    if (dp.user.vfs.isDirectory(tp.destName.data())) {
+    if (destParams.user.vfs.isDirectory(transactionParams.destName.data())) {
       result = tryBuildingAbsoluteDestName(destNameSize);
       if (result != OK) {
         return result;
       }
     }
-    if (dp.user.vfs.fileExists(fparams)) {
+    if (destParams.user.vfs.fileExists(fparams)) {
-      result = dp.user.vfs.truncateFile(fparams);
+      result = destParams.user.vfs.truncateFile(fparams);
       if (result != returnvalue::OK) {
         fileErrorHandler(events::FILESTORE_ERROR, result, "file truncation error");
         return FAILED;
         // TODO: Relevant for filestore rejection error?
       }
     } else {
-      result = dp.user.vfs.createFile(fparams);
+      result = destParams.user.vfs.createFile(fparams);
       if (result != OK) {
         fileErrorHandler(events::FILESTORE_ERROR, result, "file creation error");
         return FAILED;
@@ -328,122 +334,135 @@ ReturnValue_t cfdp::DestHandler::startTransaction(MetadataPduReader& reader, Met
   }
   EntityId sourceId;
   reader.getSourceId(sourceId);
-  if (not dp.remoteCfgTable.getRemoteCfg(sourceId, &tp.remoteCfg)) {
+  if (not destParams.remoteCfgTable.getRemoteCfg(sourceId, &transactionParams.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;
+                 << transactionParams.pduConf.sourceId.getValue() << std::endl;
 #endif
     return FAILED;
   }
-  fsmRes.step = TransactionStep::TRANSACTION_START;
   if (reader.getTransmissionMode() == TransmissionMode::UNACKNOWLEDGED) {
-    fsmRes.state = CfdpStates::BUSY_CLASS_1_NACKED;
+    fsmRes.state = CfdpState::BUSY_CLASS_1_NACKED;
   } else if (reader.getTransmissionMode() == TransmissionMode::ACKNOWLEDGED) {
-    fsmRes.state = CfdpStates::BUSY_CLASS_2_ACKED;
+    fsmRes.state = CfdpState::BUSY_CLASS_2_ACKED;
   }
-  tp.checksumType = info.getChecksumType();
+  if (transactionParams.metadataOnly) {
-  tp.closureRequested = info.isClosureRequested();
+    fsmRes.step = TransactionStep::TRANSFER_COMPLETION;
-  reader.fillConfig(tp.pduConf);
+  } else {
-  tp.pduConf.direction = Direction::TOWARDS_SENDER;
+    // Kind of ugly, make FSM working on packet per packet basis..
-  tp.transactionId.entityId = tp.pduConf.sourceId;
+    fsmRes.step = TransactionStep::TRANSACTION_START;
-  tp.transactionId.seqNum = tp.pduConf.seqNum;
+    fsmRes.step = TransactionStep::RECEIVING_FILE_DATA_PDUS;
-  fsmRes.step = TransactionStep::RECEIVING_FILE_DATA_PDUS;
+  }
-  MetadataRecvdParams params(tp.transactionId, tp.pduConf.sourceId);
+  auto& info = reader.getGenericInfo();
-  params.fileSize = tp.fileSize.getSize();
+  transactionParams.checksumType = info.getChecksumType();
-  params.destFileName = tp.destName.data();
+  transactionParams.closureRequested = info.isClosureRequested();
-  params.sourceFileName = tp.sourceName.data();
+  reader.fillConfig(transactionParams.pduConf);
-  params.msgsToUserArray = dynamic_cast<MessageToUserTlv*>(userTlvVec.data());
+  transactionParams.pduConf.direction = Direction::TOWARDS_SENDER;
-  params.msgsToUserLen = info.getOptionsLen();
+  transactionParams.transactionId.entityId = transactionParams.pduConf.sourceId;
-  dp.user.metadataRecvdIndication(params);
+  transactionParams.transactionId.seqNum = transactionParams.pduConf.seqNum;
+  transactionParams.fileSize = info.getFileSize();
+  MetadataRecvdParams params(transactionParams.transactionId, transactionParams.pduConf.sourceId,
+                             transactionParams.fileSize);
+  params.destFileName = transactionParams.destName.data();
+  params.sourceFileName = transactionParams.sourceName.data();
+  params.numberOfMsgsToUser = 0;
+  for (const auto& opt : tlvVec) {
+    if (opt.getType() == TlvType::MSG_TO_USER) {
+      msgToUserVec[params.numberOfMsgsToUser] =
+          MessageToUserTlv(opt.getValue(), opt.getLengthField());
+      params.numberOfMsgsToUser++;
+    }
+  }
+  params.msgsToUserArray = msgToUserVec.data();
+  destParams.user.metadataRecvdIndication(params);
   return result;
 }
 
-cfdp::CfdpStates cfdp::DestHandler::getCfdpState() const { return fsmRes.state; }
+cfdp::CfdpState cfdp::DestHandler::getCfdpState() const { return fsmRes.state; }
 
 ReturnValue_t cfdp::DestHandler::handleTransferCompletion() {
   ReturnValue_t result;
-  if (tp.checksumType != ChecksumType::NULL_CHECKSUM) {
+  if (transactionParams.checksumType != ChecksumType::NULL_CHECKSUM) {
     result = checksumVerification();
     if (result != OK) {
       // TODO: Warning / error handling?
     }
   } else {
-    tp.conditionCode = ConditionCode::NO_ERROR;
+    transactionParams.conditionCode = ConditionCode::NO_ERROR;
   }
   result = noticeOfCompletion();
   if (result != OK) {
   }
-  if (fsmRes.state == CfdpStates::BUSY_CLASS_1_NACKED) {
+  if (fsmRes.state == CfdpState::BUSY_CLASS_1_NACKED) {
-    if (tp.closureRequested) {
+    if (transactionParams.closureRequested) {
       fsmRes.step = TransactionStep::SENDING_FINISHED_PDU;
     } else {
       finish();
     }
-  } else if (fsmRes.state == CfdpStates::BUSY_CLASS_2_ACKED) {
+  } else if (fsmRes.state == CfdpState::BUSY_CLASS_2_ACKED) {
     fsmRes.step = TransactionStep::SENDING_FINISHED_PDU;
   }
   return OK;
 }
 
 ReturnValue_t cfdp::DestHandler::tryBuildingAbsoluteDestName(size_t destNameSize) {
-  // Maximum allowed path size is 255 characters, so this should be enough to hold the full
+  // A path may only have a maximum of 256 characters in CFDP, so this buffer should be sufficient
-  // base name in any case.
+  // for all use-cases.
-  char baseNameBuf[524]{};
+  char baseNameBuf[512]{};
-  FilesystemParams fparamsSrc(tp.sourceName.data());
+  FilesystemParams fparamsSrc(transactionParams.sourceName.data());
   size_t baseNameLen = 0;
-  ReturnValue_t result =
+  ReturnValue_t result = destParams.user.vfs.getBaseFilename(fparamsSrc, baseNameBuf,
-      dp.user.vfs.getBaseFilename(fparamsSrc, baseNameBuf, sizeof(baseNameBuf), baseNameLen);
+                                                             sizeof(baseNameBuf), baseNameLen);
   if (result != returnvalue::OK or baseNameLen == 0) {
     fileErrorHandler(events::FILENAME_TOO_LARGE_ERROR, 0, "error retrieving source base name");
     return FAILED;
   }
   // Destination name + slash + base name + null termination
-  if (destNameSize + 1 + baseNameLen + 1 > tp.destName.size()) {
+  if (destNameSize + 1 + baseNameLen + 1 > transactionParams.destName.size()) {
     fileErrorHandler(events::FILENAME_TOO_LARGE_ERROR, 0,
                      "dest filename too large after adding source base name");
     return FAILED;
   }
-  tp.destName[destNameSize++] = '/';
+  transactionParams.destName[destNameSize++] = '/';
-  std::memcpy(tp.destName.data() + destNameSize, baseNameBuf, baseNameLen);
+  std::memcpy(transactionParams.destName.data() + destNameSize, baseNameBuf, baseNameLen);
   destNameSize += baseNameLen;
-  tp.destName[destNameSize++] = '\0';
+  transactionParams.destName[destNameSize++] = '\0';
   return OK;
 }
 
-void cfdp::DestHandler::fileErrorHandler(Event event, ReturnValue_t result, const char* info) {
+void cfdp::DestHandler::fileErrorHandler(Event event, ReturnValue_t result,
-  fp.eventReporter->forwardEvent(events::FILENAME_TOO_LARGE_ERROR,
+                                         const char* info) const {
-                                 static_cast<uint8_t>(fsmRes.step), result);
+  fsfwParams.eventReporter->forwardEvent(event, static_cast<uint8_t>(fsmRes.step), result);
 #if FSFW_CPP_OSTREAM_ENABLED == 1
   sif::warning << "cfdp::DestHandler: " << info << std::endl;
 #endif
 }
 
 void cfdp::DestHandler::finish() {
-  tp.reset();
+  transactionParams.reset();
-  dp.packetListRef.clear();
+  destParams.packetListRef.clear();
-  fsmRes.state = CfdpStates::IDLE;
+  fsmRes.state = CfdpState::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());
+  FileOpParams params(transactionParams.destName.data(), transactionParams.fileSize.value());
-  while (currentOffset < tp.fileSize.value()) {
+  while (currentOffset < transactionParams.fileSize.value()) {
     uint64_t readLen;
-    if (currentOffset + buf.size() > tp.fileSize.value()) {
+    if (currentOffset + buf.size() > transactionParams.fileSize.value()) {
-      readLen = tp.fileSize.value() - currentOffset;
+      readLen = transactionParams.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());
+      auto result = destParams.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
@@ -455,40 +474,43 @@ ReturnValue_t cfdp::DestHandler::checksumVerification() {
   }
 
   uint32_t value = crcCalc.value();
-  if (value == tp.crc) {
+  if (value == transactionParams.crc) {
-    tp.conditionCode = ConditionCode::NO_ERROR;
+    transactionParams.conditionCode = ConditionCode::NO_ERROR;
-    tp.deliveryCode = FileDeliveryCode::DATA_COMPLETE;
+    transactionParams.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;
+    sif::warning << "CRC check for file " << transactionParams.destName.data() << " failed"
+                 << std::endl;
 #endif
-    tp.conditionCode = ConditionCode::FILE_CHECKSUM_FAILURE;
+    transactionParams.conditionCode = ConditionCode::FILE_CHECKSUM_FAILURE;
   }
   return OK;
 }
 
 ReturnValue_t cfdp::DestHandler::noticeOfCompletion() {
-  if (dp.cfg.indicCfg.transactionFinishedIndicRequired) {
+  if (destParams.cfg.indicCfg.transactionFinishedIndicRequired) {
-    TransactionFinishedParams params(tp.transactionId, tp.conditionCode, tp.deliveryCode,
+    TransactionFinishedParams params(
-                                     tp.deliveryStatus);
+        transactionParams.transactionId, transactionParams.conditionCode,
-    dp.user.transactionFinishedIndication(params);
+        transactionParams.deliveryCode, transactionParams.deliveryStatus);
+    destParams.user.transactionFinishedIndication(params);
   }
   return OK;
 }
 
 ReturnValue_t cfdp::DestHandler::sendFinishedPdu() {
-  FinishedInfo info(tp.conditionCode, tp.deliveryCode, tp.deliveryStatus);
+  FinishedInfo info(transactionParams.conditionCode, transactionParams.deliveryCode,
-  FinishPduCreator finishedPdu(tp.pduConf, info);
+                    transactionParams.deliveryStatus);
+  FinishPduCreator finishedPdu(transactionParams.pduConf, info);
   store_address_t storeId;
   uint8_t* dataPtr = nullptr;
   ReturnValue_t result =
-      fp.tmStore->getFreeElement(&storeId, finishedPdu.getSerializedSize(), &dataPtr);
+      fsfwParams.tmStore->getFreeElement(&storeId, finishedPdu.getSerializedSize(), &dataPtr);
   if (result != OK) {
 #if FSFW_CPP_OSTREAM_ENABLED == 1
     sif::warning << "cfdp::DestHandler:sendFinishedPdu: Getting store slot failed" << std::endl;
 #endif
-    fp.eventReporter->forwardEvent(events::STORE_ERROR, result, 0);
+    fsfwParams.eventReporter->forwardEvent(events::STORE_ERROR, result, 0);
     return result;
   }
   size_t serLen = 0;
@@ -498,16 +520,16 @@ ReturnValue_t cfdp::DestHandler::sendFinishedPdu() {
     sif::warning << "cfdp::DestHandler::sendFinishedPdu: Serializing Finished PDU failed"
                  << std::endl;
 #endif
-    fp.eventReporter->forwardEvent(events::SERIALIZATION_ERROR, result, 0);
+    fsfwParams.eventReporter->forwardEvent(events::SERIALIZATION_ERROR, result, 0);
     return result;
   }
   TmTcMessage msg(storeId);
-  result = fp.msgQueue->sendMessage(fp.packetDest.getReportReceptionQueue(), &msg);
+  result = fsfwParams.msgQueue->sendMessage(fsfwParams.packetDest.getReportReceptionQueue(), &msg);
   if (result != OK) {
 #if FSFW_CPP_OSTREAM_ENABLED == 1
     sif::warning << "cfdp::DestHandler::sendFinishedPdu: Sending PDU failed" << std::endl;
 #endif
-    fp.eventReporter->forwardEvent(events::MSG_QUEUE_ERROR, result, 0);
+    fsfwParams.eventReporter->forwardEvent(events::MSG_QUEUE_ERROR, result, 0);
     return result;
   }
   fsmRes.packetsSent++;
@@ -527,7 +549,9 @@ const cfdp::DestHandler::FsmResult& cfdp::DestHandler::updateFsmRes(uint8_t erro
   return fsmRes;
 }
 
-const cfdp::TransactionId& cfdp::DestHandler::getTransactionId() const { return tp.transactionId; }
+const cfdp::TransactionId& cfdp::DestHandler::getTransactionId() const {
+  return transactionParams.transactionId;
+}
 
 void cfdp::DestHandler::checkAndHandleError(ReturnValue_t result, uint8_t& errorIdx) {
   if (result != OK and errorIdx < 3) {
@@ -536,13 +560,15 @@ void cfdp::DestHandler::checkAndHandleError(ReturnValue_t result, uint8_t& error
   }
 }
 
-void cfdp::DestHandler::setMsgQueue(MessageQueueIF& queue) { fp.msgQueue = &queue; }
+void cfdp::DestHandler::setMsgQueue(MessageQueueIF& queue) { fsfwParams.msgQueue = &queue; }
 
 void cfdp::DestHandler::setEventReporter(EventReportingProxyIF& reporter) {
-  fp.eventReporter = &reporter;
+  fsfwParams.eventReporter = &reporter;
 }
 
-const cfdp::DestHandlerParams& cfdp::DestHandler::getDestHandlerParams() const { return dp; }
+const cfdp::DestHandlerParams& cfdp::DestHandler::getDestHandlerParams() const {
+  return destParams;
+}
 
-StorageManagerIF* cfdp::DestHandler::getTmStore() const { return fp.tmStore; }
+StorageManagerIF* cfdp::DestHandler::getTmStore() const { return fsfwParams.tmStore; }
-StorageManagerIF* cfdp::DestHandler::getTcStore() const { return fp.tcStore; }
+StorageManagerIF* cfdp::DestHandler::getTcStore() const { return fsfwParams.tcStore; }

src/fsfw/cfdp/handler/DestHandler.h

@@ -14,6 +14,7 @@
 #include "fsfw/cfdp/handler/mib.h"
 #include "fsfw/cfdp/pdu/MetadataPduReader.h"
 #include "fsfw/cfdp/pdu/PduConfig.h"
+#include "fsfw/cfdp/tlv/MessageToUserTlv.h"
 #include "fsfw/container/DynamicFIFO.h"
 #include "fsfw/storagemanager/StorageManagerIF.h"
 #include "fsfw/storagemanager/storeAddress.h"
@@ -21,23 +22,9 @@
 
 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,
@@ -45,6 +32,9 @@ struct DestHandlerParams {
                     // 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
+                    // TODO: Actually, we can provide a better abstraction via interface, which
+                    //       allows using something like a bounded map. This simplifies
+                    //       the implementation significantly.
                     LostSegmentsListBase& lostSegmentsContainer)
       : cfg(std::move(cfg)),
         user(user),
@@ -58,31 +48,10 @@ struct DestHandlerParams {
 
   PacketInfoListBase& packetListRef;
   LostSegmentsListBase& lostSegmentsContainer;
-  uint8_t maxTlvsInOnePdu = 10;
+  uint8_t maxTlvsInOnePdu = 20;
   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 : uint8_t {
@@ -99,7 +68,7 @@ class DestHandler {
     ReturnValue_t result = returnvalue::OK;
     CallStatus callStatus = CallStatus::CALL_AFTER_DELAY;
     TransactionStep step = TransactionStep::IDLE;
-    CfdpStates state = CfdpStates::IDLE;
+    CfdpState state = CfdpState::IDLE;
     uint32_t packetsSent = 0;
     uint8_t errors = 0;
     std::array<ReturnValue_t, 3> errorCodes = {};
@@ -124,7 +93,7 @@ class DestHandler {
    *  - @c returnvalue::OK  State machine OK for this execution cycle
    *  - @c CALL_FSM_AGAIN   State machine should be called again.
    */
-  const FsmResult& performStateMachine();
+  const FsmResult& stateMachine();
   void setMsgQueue(MessageQueueIF& queue);
   void setEventReporter(EventReportingProxyIF& reporter);
 
@@ -132,7 +101,7 @@ class DestHandler {
 
   ReturnValue_t initialize();
 
-  [[nodiscard]] CfdpStates getCfdpState() const;
+  [[nodiscard]] CfdpState getCfdpState() const;
   [[nodiscard]] TransactionStep getTransactionStep() const;
   [[nodiscard]] const TransactionId& getTransactionId() const;
   [[nodiscard]] const DestHandlerParams& getDestHandlerParams() const;
@@ -157,17 +126,19 @@ class DestHandler {
       crc = 0;
       progress = 0;
       remoteCfg = nullptr;
+      metadataOnly = false;
       closureRequested = false;
       vfsErrorCount = 0;
       checksumType = ChecksumType::NULL_CHECKSUM;
     }
 
+    bool metadataOnly = false;
     ChecksumType checksumType = ChecksumType::NULL_CHECKSUM;
     bool closureRequested = false;
     uint16_t vfsErrorCount = 0;
     std::vector<char> sourceName;
     std::vector<char> destName;
-    cfdp::FileSize fileSize;
+    cfdp::Fss fileSize;
     TransactionId transactionId;
     PduConfig pduConf;
     ConditionCode conditionCode = ConditionCode::NO_ERROR;
@@ -179,13 +150,13 @@ class DestHandler {
   };
 
   std::vector<cfdp::Tlv> tlvVec;
-  std::vector<cfdp::Tlv> userTlvVec;
+  std::vector<MessageToUserTlv> msgToUserVec;
-  DestHandlerParams dp;
+  TransactionParams transactionParams;
-  FsfwParams fp;
+  DestHandlerParams destParams;
-  TransactionParams tp;
+  cfdp::FsfwParams fsfwParams;
   FsmResult fsmRes;
 
-  ReturnValue_t startTransaction(MetadataPduReader& reader, MetadataInfo& info);
+  ReturnValue_t startTransaction(const MetadataPduReader& reader);
   ReturnValue_t handleMetadataPdu(const PacketInfo& info);
   ReturnValue_t handleFileDataPdu(const PacketInfo& info);
   ReturnValue_t handleEofPdu(const PacketInfo& info);
@@ -196,7 +167,7 @@ class DestHandler {
   ReturnValue_t sendFinishedPdu();
   ReturnValue_t noticeOfCompletion();
   ReturnValue_t checksumVerification();
-  void fileErrorHandler(Event event, ReturnValue_t result, const char* info);
+  void fileErrorHandler(Event event, ReturnValue_t result, const char* info) const;
   const FsmResult& updateFsmRes(uint8_t errors);
   void checkAndHandleError(ReturnValue_t result, uint8_t& errorIdx);
   void finish();

src/fsfw/cfdp/handler/PutRequest.cpp

@@ -0,0 +1,201 @@
+#include "PutRequest.h"
+
+using namespace returnvalue;
+
+cfdp::PutRequest::PutRequest(cfdp::EntityId destId, const uint8_t *msgsToUser,
+                             size_t msgsToUserTotalSize, const uint8_t *fsRequests,
+                             size_t fsRequestsSize)
+    : destId(std::move(destId)),
+      metadataOnly(true),
+      msgsToUsersTotalSize(msgsToUserTotalSize),
+      msgsToUserStartPtr(msgsToUser),
+      fsRequestsTotalSize(fsRequestsSize),
+      fsRequestStartPtr(fsRequests) {}
+
+cfdp::PutRequest::PutRequest(cfdp::EntityId destId, cfdp::StringLv &sourceName,
+                             cfdp::StringLv &destName)
+    : destId(std::move(destId)), sourceName(std::move(sourceName)), destName(std::move(destName)) {}
+
+[[nodiscard]] bool cfdp::PutRequest::isMetadataOnly() const { return metadataOnly; }
+
+ReturnValue_t cfdp::PutRequest::serialize(uint8_t **buffer, size_t *size, size_t maxSize,
+                                          SerializeIF::Endianness streamEndianness) const {
+  if (buffer == nullptr or size == nullptr) {
+    return FAILED;
+  }
+  if (*size + getSerializedSize() > maxSize) {
+    return SerializeIF::BUFFER_TOO_SHORT;
+  }
+  ReturnValue_t result = destId.serializeAsLv(buffer, size, maxSize);
+  if (result != OK) {
+    return result;
+  }
+  result = SerializeAdapter::serialize(&metadataOnly, buffer, size, maxSize, streamEndianness);
+  if (result != OK) {
+    return result;
+  }
+  if (!metadataOnly) {
+    result = sourceName.serialize(buffer, size, maxSize, streamEndianness);
+    if (result != OK) {
+      return result;
+    }
+    result = destName.serialize(buffer, size, maxSize, streamEndianness);
+    if (result != OK) {
+      return result;
+    }
+    result =
+        SerializeAdapter::serialize(&hasTransmissionMode, buffer, size, maxSize, streamEndianness);
+    if (result != OK) {
+      return result;
+    }
+    result =
+        SerializeAdapter::serialize(&transmissionMode, buffer, size, maxSize, streamEndianness);
+    if (result != OK) {
+      return result;
+    }
+    result =
+        SerializeAdapter::serialize(&hasClosureRequested, buffer, size, maxSize, streamEndianness);
+    if (result != OK) {
+      return result;
+    }
+    result =
+        SerializeAdapter::serialize(&closureRequested, buffer, size, maxSize, streamEndianness);
+    if (result != OK) {
+      return result;
+    }
+  }
+  result =
+      SerializeAdapter::serialize(&msgsToUsersTotalSize, buffer, size, maxSize, streamEndianness);
+  if (result != OK) {
+    return result;
+  }
+  std::memcpy(*buffer, msgsToUserStartPtr, msgsToUsersTotalSize);
+  *buffer += msgsToUsersTotalSize;
+  *size += msgsToUsersTotalSize;
+
+  result =
+      SerializeAdapter::serialize(&fsRequestsTotalSize, buffer, size, maxSize, streamEndianness);
+  if (result != OK) {
+    return result;
+  }
+  std::memcpy(*buffer, fsRequestStartPtr, fsRequestsTotalSize);
+  *buffer += fsRequestsTotalSize;
+  *size += fsRequestsTotalSize;
+  return OK;
+}
+
+ReturnValue_t cfdp::PutRequest::deSerialize(const uint8_t **buffer, size_t *size,
+                                            SerializeIF::Endianness streamEndianness) {
+  if (buffer == nullptr or size == nullptr) {
+    return FAILED;
+  }
+  ReturnValue_t result = destId.deSerializeFromLv(buffer, size);
+  if (result != OK) {
+    return result;
+  }
+  result = SerializeAdapter::deSerialize(&metadataOnly, buffer, size, streamEndianness);
+  if (result != OK) {
+    return result;
+  }
+  if (!metadataOnly) {
+    result = sourceName.deSerialize(buffer, size, streamEndianness);
+    if (result != OK) {
+      return result;
+    }
+    result = destName.deSerialize(buffer, size, streamEndianness);
+    if (result != OK) {
+      return result;
+    }
+    result = SerializeAdapter::deSerialize(&hasTransmissionMode, buffer, size, streamEndianness);
+    if (result != OK) {
+      return result;
+    }
+    result = SerializeAdapter::deSerialize(&transmissionMode, buffer, size, streamEndianness);
+    if (result != OK) {
+      return result;
+    }
+    result = SerializeAdapter::deSerialize(&hasClosureRequested, buffer, size, streamEndianness);
+    if (result != OK) {
+      return result;
+    }
+    result = SerializeAdapter::deSerialize(&closureRequested, buffer, size, streamEndianness);
+    if (result != OK) {
+      return result;
+    }
+  }
+  result = SerializeAdapter::deSerialize(&msgsToUsersTotalSize, buffer, size, streamEndianness);
+  if (result != OK) {
+    return result;
+  }
+  msgsToUserStartPtr = *buffer;
+  *buffer += msgsToUsersTotalSize;
+  *size += msgsToUsersTotalSize;
+
+  result = SerializeAdapter::deSerialize(&fsRequestsTotalSize, buffer, size, streamEndianness);
+  if (result != OK) {
+    return result;
+  }
+  fsRequestStartPtr = *buffer;
+  *buffer += fsRequestsTotalSize;
+  *size += fsRequestsTotalSize;
+  return OK;
+}
+
+size_t cfdp::PutRequest::getSerializedSize() const {
+  // Entity ID LV (1 leading size byte) and the metadata only flag.
+  size_t baseSize = 1 + destId.getSerializedSize() + 1;
+  if (!metadataOnly) {
+    baseSize += sourceName.getSerializedSize() + destName.getSerializedSize() + 4;
+  }
+  baseSize += sizeof(msgsToUsersTotalSize) + msgsToUsersTotalSize + sizeof(fsRequestsTotalSize) +
+              fsRequestsTotalSize;
+  return baseSize;
+}
+
+void cfdp::PutRequest::setSourceAndDestName(cfdp::StringLv &sourceName_,
+                                            cfdp::StringLv &destName_) {
+  metadataOnly = false;
+  this->sourceName = std::move(sourceName_);
+  this->destName = std::move(destName_);
+}
+
+const cfdp::StringLv &cfdp::PutRequest::getSourceName() const { return sourceName; }
+
+const cfdp::StringLv &cfdp::PutRequest::getDestName() const { return destName; }
+
+const cfdp::EntityId &cfdp::PutRequest::getDestId() const { return destId; }
+
+void cfdp::PutRequest::setDestId(cfdp::EntityId id) { destId = std::move(id); }
+
+void cfdp::PutRequest::setTransmissionMode(cfdp::TransmissionMode transmissionMode_) {
+  this->transmissionMode = transmissionMode_;
+  hasTransmissionMode = true;
+}
+
+void cfdp::PutRequest::clearTransmissionMode() { hasTransmissionMode = false; }
+
+void cfdp::PutRequest::clearClosureRequest() { hasClosureRequested = false; }
+
+void cfdp::PutRequest::setClosureRequest(bool closureRequested_) {
+  this->closureRequested = closureRequested_;
+  hasClosureRequested = true;
+}
+
+const uint8_t *cfdp::PutRequest::getMessagesToUser(size_t &totalSize) {
+  totalSize = this->msgsToUsersTotalSize;
+  return msgsToUserStartPtr;
+}
+
+bool cfdp::PutRequest::getClosureRequested(bool &closureRequested_) const {
+  if (hasClosureRequested) {
+    closureRequested_ = this->closureRequested;
+  }
+  return hasClosureRequested;
+}
+
+bool cfdp::PutRequest::getTransmissionMode(cfdp::TransmissionMode &mode) const {
+  if (hasTransmissionMode) {
+    mode = static_cast<cfdp::TransmissionMode>(this->transmissionMode);
+  }
+  return hasTransmissionMode;
+}

src/fsfw/cfdp/handler/PutRequest.h

@@ -0,0 +1,82 @@
+#pragma once
+
+#include <optional>
+#include <vector>
+
+#include "fsfw/cfdp/VarLenFields.h"
+#include "fsfw/cfdp/tlv/FilestoreRequestTlv.h"
+#include "fsfw/cfdp/tlv/MessageToUserTlv.h"
+
+namespace cfdp {
+
+class PutRequest : public SerializeIF {
+ public:
+  /**
+   * Metadata only constructor.
+   * @param destId
+   * @param msgsToUser
+   * @param msgsToUserTotalSize
+   * @param fsRequests
+   * @param fsRequestsSize
+   */
+  PutRequest(EntityId destId, const uint8_t* msgsToUser, size_t msgsToUserTotalSize,
+             const uint8_t* fsRequests, size_t fsRequestsSize);
+  /**
+   * Put request to initiate file transfers. By default, the transmission mode and closure requested
+   * parameter are not present, thereby being derived from the remote configuration for a
+   * particular destination ID.
+   * @param destId
+   * @param sourceName
+   * @param destName
+   */
+  PutRequest(EntityId destId, cfdp::StringLv& sourceName, cfdp::StringLv& destName);
+
+  /**
+   * Default constructor for deserialization.
+   */
+  PutRequest() = default;
+
+  [[nodiscard]] ReturnValue_t serialize(uint8_t** buffer, size_t* size, size_t maxSize,
+                                        Endianness streamEndianness) const override;
+  ReturnValue_t deSerialize(const uint8_t** buffer, size_t* size,
+                            Endianness streamEndianness) override;
+  [[nodiscard]] size_t getSerializedSize() const override;
+  void setSourceAndDestName(cfdp::StringLv& sourceName, cfdp::StringLv& destName);
+
+  [[nodiscard]] const cfdp::StringLv& getSourceName() const;
+  [[nodiscard]] const cfdp::StringLv& getDestName() const;
+
+  void setTransmissionMode(cfdp::TransmissionMode transmissionMode);
+  void clearTransmissionMode();
+  void setClosureRequest(bool closureRequested);
+  void clearClosureRequest();
+
+  const uint8_t* getMessagesToUser(size_t& msgSize);
+
+  [[nodiscard]] bool isMetadataOnly() const;
+
+  bool getTransmissionMode(TransmissionMode& mode) const;
+  bool getClosureRequested(bool& closureRequested) const;
+
+  [[nodiscard]] const EntityId& getDestId() const;
+  void setDestId(EntityId id);
+
+ private:
+  EntityId destId;
+  uint8_t metadataOnly = true;
+  // Transaction parameters. Omitted if the put request is metadata only.
+  cfdp::StringLv sourceName;
+
+  cfdp::StringLv destName;
+  bool hasTransmissionMode = false;
+  uint8_t transmissionMode = TransmissionMode::UNACKNOWLEDGED;
+  bool hasClosureRequested = false;
+  uint8_t closureRequested = false;
+  // Metadata
+  size_t msgsToUsersTotalSize = 0;
+  const uint8_t* msgsToUserStartPtr = nullptr;
+  size_t fsRequestsTotalSize = 0;
+  const uint8_t* fsRequestStartPtr = nullptr;
+};
+
+}  // namespace cfdp

src/fsfw/cfdp/handler/RemoteConfigTableIF.h

@@ -16,7 +16,7 @@ class RemoteConfigTableIF {
  */
 class OneRemoteConfigProvider : public RemoteConfigTableIF {
  public:
-  explicit OneRemoteConfigProvider(RemoteEntityCfg cfg) : cfg(std::move(cfg)) {}
+  explicit OneRemoteConfigProvider(RemoteEntityCfg& cfg) : cfg(cfg) {}
 
   bool getRemoteCfg(const EntityId& remoteId, cfdp::RemoteEntityCfg** cfg_) override {
     if (remoteId != cfg.remoteId) {
@@ -27,7 +27,7 @@ class OneRemoteConfigProvider : public RemoteConfigTableIF {
   }
 
  private:
-  RemoteEntityCfg cfg;
+  RemoteEntityCfg& cfg;
 };
 
 }  // namespace cfdp

src/fsfw/cfdp/handler/ReservedMessageParser.cpp

@@ -0,0 +1,74 @@
+#include "ReservedMessageParser.h"
+
+#include "fsfw/cfdp/CfdpMessage.h"
+#include "fsfw/cfdp/handler/PutRequest.h"
+#include "fsfw/cfdp/tlv/MessageToUserTlv.h"
+#include "fsfw/ipc/CommandMessage.h"
+#include "fsfw/ipc/QueueFactory.h"
+
+using namespace returnvalue;
+
+cfdp::ReservedMessageParser::ReservedMessageParser(StorageManagerIF& ipcStore,
+                                                   MessageQueueIF& msgQueue,
+                                                   MessageQueueId_t userDestination)
+    : msgQueue(msgQueue), ipcStore(ipcStore), userDestination(userDestination) {}
+
+ReturnValue_t cfdp::ReservedMessageParser::parse(const MessageToUserTlv* msgsToUserArray,
+                                                 size_t numMsgToUser) {
+  ReturnValue_t result = returnvalue::OK;
+  cfdp::StringLv sourceFileName;
+  cfdp::StringLv destFileName;
+  PutRequest putRequest;
+  const uint8_t* currentPtr = nullptr;
+  size_t deserSize = 0;
+  bool needToSendPutRequest = false;
+  for (size_t idx = 0; idx < numMsgToUser; idx++) {
+    if (&msgsToUserArray[idx] == nullptr) {
+      continue;
+    }
+    uint8_t messageType = 0;
+    if (msgsToUserArray[idx].isReservedCfdpMessage(messageType, &currentPtr, deserSize)) {
+      if (messageType == static_cast<uint8_t>(ProxyOpMessageType::PUT_REQUEST)) {
+        EntityId entityIdLv;
+        result = entityIdLv.deSerializeFromLv(&currentPtr, &deserSize);
+        if (result != returnvalue::OK) {
+          return result;
+        }
+        putRequest.setDestId(entityIdLv);
+        result =
+            sourceFileName.deSerialize(&currentPtr, &deserSize, SerializeIF::Endianness::NETWORK);
+        if (result != OK) {
+          return result;
+        }
+        result =
+            destFileName.deSerialize(&currentPtr, &deserSize, SerializeIF::Endianness::NETWORK);
+        if (result != OK) {
+          return result;
+        }
+        putRequest.setSourceAndDestName(sourceFileName, destFileName);
+        needToSendPutRequest = true;
+      }
+    }
+  }
+  if (needToSendPutRequest) {
+    store_address_t storeId;
+    uint8_t* dataPtr;
+    result = ipcStore.getFreeElement(&storeId, putRequest.getSerializedSize(), &dataPtr);
+    if (result != OK) {
+      return result;
+    }
+    size_t serLen = 0;
+    result = putRequest.serialize(&dataPtr, &serLen, putRequest.getSerializedSize(),
+                                  SerializeIF::Endianness::MACHINE);
+    if (result != OK) {
+      return result;
+    }
+    CommandMessage msg;
+    CfdpMessage::setPutRequest(&msg, storeId);
+    result = msgQueue.sendMessage(userDestination, &msg);
+    if (result != OK) {
+      return result;
+    }
+  }
+  return OK;
+}

src/fsfw/cfdp/handler/ReservedMessageParser.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include "fsfw/cfdp/tlv/MessageToUserTlv.h"
+#include "fsfw/ipc/MessageQueueIF.h"
+#include "fsfw/storagemanager/StorageManagerIF.h"
+
+namespace cfdp {
+
+/**
+ * This class parses messages to user for special CFDP messages and converts them to appropriate
+ * CFDP requests sent via the IPC store where applicable. It also provides an API to retrieve
+ * custom messages which are not special CFDP messages from a provided bytestream.
+ */
+class ReservedMessageParser {
+ public:
+  ReservedMessageParser(StorageManagerIF& ipcStore, MessageQueueIF& msgQueue,
+                        MessageQueueId_t userDestination);
+
+  ReturnValue_t parse(const MessageToUserTlv* msgsToUserArray, size_t numMsgsToUser);
+
+ private:
+  MessageQueueIF& msgQueue;
+  StorageManagerIF& ipcStore;
+  MessageQueueId_t userDestination;
+};
+
+}  // namespace cfdp

src/fsfw/cfdp/handler/SourceHandler.cpp

@@ -1 +1,376 @@
 #include "SourceHandler.h"
+
+#include <etl/crc32.h>
+
+#include <array>
+
+#include "fsfw/cfdp/pdu/EofPduCreator.h"
+#include "fsfw/cfdp/pdu/FileDataCreator.h"
+#include "fsfw/cfdp/pdu/MetadataPduCreator.h"
+#include "fsfw/filesystem/HasFileSystemIF.h"
+#include "fsfw/globalfunctions/arrayprinter.h"
+#include "fsfw/objectmanager.h"
+#include "fsfw/serviceinterface.h"
+#include "fsfw/tasks/TaskFactory.h"
+#include "fsfw/tmtcservices/TmTcMessage.h"
+
+using namespace returnvalue;
+
+cfdp::SourceHandler::SourceHandler(SourceHandlerParams params, FsfwParams fsfwParams)
+    : sourceParams(std::move(params)), fsfwParams(fsfwParams) {
+  // The entity ID portion of the transaction ID will always remain fixed.
+  transactionParams.id.entityId = sourceParams.cfg.localId;
+  transactionParams.pduConf.sourceId = sourceParams.cfg.localId;
+  if (sourceParams.seqCountProvider.bitWidth() == 8) {
+    transactionParams.pduConf.seqNum.setWidth(cfdp::WidthInBytes::ONE_BYTE);
+  } else if (sourceParams.seqCountProvider.bitWidth() == 16) {
+    transactionParams.pduConf.seqNum.setWidth(cfdp::WidthInBytes::TWO_BYTES);
+  } else if (sourceParams.seqCountProvider.bitWidth() == 32) {
+    transactionParams.pduConf.seqNum.setWidth(cfdp::WidthInBytes::FOUR_BYTES);
+  } else if (sourceParams.seqCountProvider.bitWidth() == 64) {
+    transactionParams.pduConf.seqNum.setWidth(cfdp::WidthInBytes::EIGHT_BYTES);
+  } else {
+#if FSFW_CPP_OSTREAM_ENABLED == 1
+    sif::error << "cfdp::SourceHandler: Seq count provider bit width "
+               << sourceParams.seqCountProvider.bitWidth() << " not allowed" << std::endl;
+#else
+    sif::printError("cfdp::SourceHandler: Seq count provider bit width %d not allowed\n",
+                    sourceParams.seqCountProvider.bitWidth());
+#endif
+    // Yeah, what am I supposed to do here? Can't throw an exception in the FSFW..
+    transactionParams.pduConf.seqNum.setWidth(cfdp::WidthInBytes::ONE_BYTE);
+  }
+  transactionParams.pduConf.seqNum.setValue(0);
+}
+
+cfdp::SourceHandler::FsmResult& cfdp::SourceHandler::fsmNacked() {
+  ReturnValue_t result;
+  if (step == TransactionStep::IDLE) {
+    step = TransactionStep::TRANSACTION_START;
+  }
+  if (step == TransactionStep::TRANSACTION_START) {
+    sourceParams.user.transactionIndication(transactionParams.id);
+    result = checksumGeneration();
+    if (result != OK) {
+      addError(result);
+    }
+    step = TransactionStep::SENDING_METADATA;
+  }
+  if (step == TransactionStep::SENDING_METADATA) {
+    result = prepareAndSendMetadataPdu();
+    if (result != OK) {
+      addError(result);
+    }
+    fsmResult.callStatus = CallStatus::CALL_AGAIN;
+    return fsmResult;
+  }
+  if (step == TransactionStep::SENDING_FILE_DATA) {
+    bool noFdPdu = false;
+    result = prepareAndSendNextFileDataPdu(noFdPdu);
+    if (result == OK and !noFdPdu) {
+      fsmResult.callStatus = CallStatus::CALL_AGAIN;
+      return fsmResult;
+    }
+  }
+  if (step == TransactionStep::SENDING_EOF) {
+    result = prepareAndSendEofPdu();
+    if (result != OK) {
+      addError(result);
+    }
+    if (sourceParams.cfg.indicCfg.eofSentIndicRequired) {
+      sourceParams.user.eofSentIndication(transactionParams.id);
+    }
+    if (transactionParams.closureRequested) {
+      step = TransactionStep::WAIT_FOR_FINISH;
+      fsmResult.callStatus = CallStatus::CALL_AFTER_DELAY;
+    } else {
+      step = TransactionStep::NOTICE_OF_COMPLETION;
+      fsmResult.callStatus = CallStatus::CALL_AGAIN;
+    }
+    return fsmResult;
+  }
+  if (step == TransactionStep::WAIT_FOR_FINISH) {
+    // TODO: In case this is a request with closure, wait for finish.
+    // Done, issue notice of completion
+    step = TransactionStep::NOTICE_OF_COMPLETION;
+  }
+  if (step == TransactionStep::NOTICE_OF_COMPLETION) {
+    noticeOfCompletion();
+    reset();
+  }
+  return fsmResult;
+}
+
+const cfdp::SourceHandler::FsmResult& cfdp::SourceHandler::stateMachine() {
+  fsmResult.packetsSent = 0;
+  fsmResult.errors = 0;
+  fsmResult.callStatus = CallStatus::DONE;
+  if (state == cfdp::CfdpState::IDLE) {
+    return fsmResult;
+  }
+  if (state == cfdp::CfdpState::BUSY_CLASS_1_NACKED) {
+    return fsmNacked();
+  }
+  return fsmResult;
+}
+
+ReturnValue_t cfdp::SourceHandler::checksumGeneration() {
+  if (transactionParams.fileSize.value() == 0) {
+    // NULL checksum for empty file.
+    transactionParams.crc = 0;
+    return OK;
+  }
+  std::array<uint8_t, 1024> buf{};
+  etl::crc32 crcCalc;
+  uint64_t currentOffset = 0;
+  FileOpParams params(transactionParams.sourceName.data(), transactionParams.fileSize.value());
+  while (currentOffset < transactionParams.fileSize.value()) {
+    uint64_t readLen;
+    if (currentOffset + buf.size() > transactionParams.fileSize.value()) {
+      readLen = transactionParams.fileSize.value() - currentOffset;
+    } else {
+      readLen = buf.size();
+    }
+    if (readLen > 0) {
+      params.offset = currentOffset;
+      params.size = readLen;
+      auto result = sourceParams.user.vfs.readFromFile(params, buf.data(), buf.size());
+      if (result != OK) {
+        addError(result);
+        return FAILED;
+      }
+      crcCalc.add(buf.begin(), buf.begin() + readLen);
+    }
+    currentOffset += readLen;
+  }
+
+  transactionParams.crc = crcCalc.value();
+  return OK;
+}
+
+ReturnValue_t cfdp::SourceHandler::transactionStart(PutRequest& putRequest, RemoteEntityCfg& cfg) {
+  if (state != CfdpState::IDLE) {
+    return SOURCE_TRANSACTION_PENDING;
+  }
+  if (cfg.remoteId != putRequest.getDestId()) {
+    return WRONG_REMOTE_CFG_ENTITY_ID;
+  }
+  if (putRequest.getSourceName().getValueLen() == 0) {
+    return SOURCE_NAME_EMPTY;
+  }
+  if (putRequest.getDestName().getValueLen() == 0) {
+    return DEST_NAME_EMPTY;
+  }
+  const char* srcNamePtr = putRequest.getSourceName().getCString(transactionParams.sourceNameSize);
+  const char* destNamePtr = putRequest.getDestName().getCString(transactionParams.destNameSize);
+  std::strncpy(transactionParams.sourceName.data(), srcNamePtr, transactionParams.sourceNameSize);
+  std::strncpy(transactionParams.destName.data(), destNamePtr, transactionParams.destNameSize);
+  // Add 0 termination. The source and dest name size can not be larger than UINT8_MAX, so this
+  // operation is safe.
+  transactionParams.sourceName[transactionParams.sourceNameSize] = '\0';
+  transactionParams.destName[transactionParams.destNameSize] = '\0';
+  FilesystemParams params(transactionParams.sourceName.data());
+  if (!sourceParams.user.vfs.fileExists(params)) {
+    return FILE_DOES_NOT_EXIST;
+  }
+  if (cfg.maxFileSegmentLen > fileBuf.size() or cfg.maxFileSegmentLen == 0) {
+    return FILE_SEGMENT_LEN_INVALID;
+  }
+  // If transmission mode is not set, use default transmission mode for the remote entity.
+  if (not putRequest.getTransmissionMode(transactionParams.pduConf.mode)) {
+    transactionParams.pduConf.mode = cfg.defaultTransmissionMode;
+  }
+  // If closure request field is not set, use default option for the remote entity.
+  if (not putRequest.getClosureRequested(transactionParams.closureRequested)) {
+    transactionParams.closureRequested = cfg.closureRequested;
+  }
+  const EntityId& destId = putRequest.getDestId();
+  // The width of the source and destination ID must be the same. Use the larger ID value to
+  // ensure the width is large enough for both IDs
+  if (destId.getWidth() > transactionParams.pduConf.sourceId.getWidth()) {
+    transactionParams.pduConf.destId = destId;
+    transactionParams.pduConf.sourceId.setWidth(destId.getWidth());
+  } else {
+    transactionParams.pduConf.destId.setValueAndWidth(transactionParams.pduConf.sourceId.getWidth(),
+                                                      destId.getValue());
+  }
+  // Only used for PDU forwarding, file is sent to file receiver regularly here.
+  transactionParams.pduConf.direction = Direction::TOWARDS_RECEIVER;
+  transactionParams.pduConf.seqNum.setValue(sourceParams.seqCountProvider.getAndIncrement());
+  transactionParams.id.seqNum = transactionParams.pduConf.seqNum;
+
+  if (transactionParams.pduConf.mode == TransmissionMode::ACKNOWLEDGED) {
+    state = cfdp::CfdpState::BUSY_CLASS_2_ACKED;
+  } else if (transactionParams.pduConf.mode == TransmissionMode::UNACKNOWLEDGED) {
+    state = cfdp::CfdpState::BUSY_CLASS_1_NACKED;
+  }
+  step = TransactionStep::IDLE;
+  uint64_t fileSize = 0;
+  sourceParams.user.vfs.getFileSize(params, fileSize);
+  transactionParams.pduConf.largeFile = false;
+  if (fileSize > UINT32_MAX) {
+    transactionParams.pduConf.largeFile = true;
+  }
+  if (fileSize == 0) {
+    transactionParams.checksumType = ChecksumType::NULL_CHECKSUM;
+  } else {
+    transactionParams.checksumType = ChecksumType::CRC_32;
+  }
+  transactionParams.fileSize.setFileSize(fileSize, transactionParams.pduConf.largeFile);
+  transactionParams.progress = 0;
+  transactionParams.remoteCfg = cfg;
+  return OK;
+}
+
+ReturnValue_t cfdp::SourceHandler::prepareAndSendMetadataPdu() {
+  cfdp::StringLv sourceName(transactionParams.sourceName.data(), transactionParams.sourceNameSize);
+  cfdp::StringLv destName(transactionParams.destName.data(), transactionParams.destNameSize);
+  auto metadataInfo =
+      MetadataGenericInfo(transactionParams.closureRequested, transactionParams.checksumType,
+                          transactionParams.fileSize);
+  auto metadataPdu =
+      MetadataPduCreator(transactionParams.pduConf, metadataInfo, sourceName, destName, nullptr, 0);
+  ReturnValue_t result = sendGenericPdu(metadataPdu);
+  if (result != OK) {
+    return result;
+  }
+  // Advance FSM if everything works
+  step = TransactionStep::SENDING_FILE_DATA;
+  return OK;
+}
+
+ReturnValue_t cfdp::SourceHandler::prepareAndSendNextFileDataPdu(bool& noFileDataPdu) {
+  cfdp::Fss offset(transactionParams.progress);
+  uint64_t readLen;
+  uint64_t fileSize = transactionParams.fileSize.value();
+  noFileDataPdu = false;
+  if (fileSize == 0) {
+    // We are done, no need to send file data PDUs for an empty file.
+    step = TransactionStep::SENDING_EOF;
+    noFileDataPdu = true;
+    return OK;
+  }
+  if (fileSize < transactionParams.remoteCfg.maxFileSegmentLen) {
+    readLen = transactionParams.fileSize.value();
+  } else {
+    if (transactionParams.progress + transactionParams.remoteCfg.maxFileSegmentLen > fileSize) {
+      readLen = fileSize - transactionParams.progress;
+    } else {
+      readLen = transactionParams.remoteCfg.maxFileSegmentLen;
+    }
+  }
+  FileOpParams fileParams(transactionParams.sourceName.data(), readLen);
+  fileParams.offset = transactionParams.progress;
+  ReturnValue_t result =
+      sourceParams.user.vfs.readFromFile(fileParams, fileBuf.data(), fileBuf.size());
+  if (result != returnvalue::OK) {
+    addError(result);
+    return result;
+  }
+  auto fileDataInfo = FileDataInfo(offset, fileBuf.data(), readLen);
+  auto fileDataPdu = FileDataCreator(transactionParams.pduConf, fileDataInfo);
+  result = sendGenericPdu(fileDataPdu);
+  if (result != OK) {
+    return result;
+  }
+  transactionParams.progress += readLen;
+  if (transactionParams.progress >= fileSize) {
+    // Advance FSM after all file data PDUs were sent.
+    step = TransactionStep::SENDING_EOF;
+  }
+  return OK;
+}
+
+ReturnValue_t cfdp::SourceHandler::prepareAndSendEofPdu() {
+  auto eofInfo =
+      EofInfo(ConditionCode::NO_ERROR, transactionParams.crc, transactionParams.fileSize);
+  auto eofPdu = EofPduCreator(transactionParams.pduConf, eofInfo);
+  ReturnValue_t result = sendGenericPdu(eofPdu);
+  if (result != OK) {
+    return result;
+  }
+  return OK;
+}
+
+ReturnValue_t cfdp::SourceHandler::initialize() {
+  if (fsfwParams.tmStore == nullptr) {
+    fsfwParams.tmStore = ObjectManager::instance()->get<StorageManagerIF>(objects::TM_STORE);
+    if (fsfwParams.tmStore == nullptr) {
+      return FAILED;
+    }
+  }
+
+  if (fsfwParams.tcStore == nullptr) {
+    fsfwParams.tcStore = ObjectManager::instance()->get<StorageManagerIF>(objects::TC_STORE);
+    if (fsfwParams.tcStore == nullptr) {
+      return FAILED;
+    }
+  }
+
+  if (fsfwParams.msgQueue == nullptr) {
+    return FAILED;
+  }
+  return OK;
+}
+
+ReturnValue_t cfdp::SourceHandler::sendGenericPdu(const SerializeIF& pdu) {
+  uint8_t* dataPtr;
+  store_address_t storeId;
+  ReturnValue_t result =
+      fsfwParams.tmStore->getFreeElement(&storeId, pdu.getSerializedSize(), &dataPtr);
+  if (result != OK) {
+    addError(result);
+    fsmResult.callStatus = CallStatus::CALL_AFTER_DELAY;
+    if (result == StorageManagerIF::DATA_STORAGE_FULL) {
+      return TM_STORE_FULL;
+    }
+    return result;
+  }
+  size_t serializedLen = 0;
+  result = pdu.serializeBe(dataPtr, serializedLen, pdu.getSerializedSize());
+  if (result != OK) {
+    addError(result);
+    return result;
+  }
+  TmTcMessage tmMsg(storeId);
+  result =
+      fsfwParams.msgQueue->sendMessage(fsfwParams.packetDest.getReportReceptionQueue(), &tmMsg);
+  if (result != OK) {
+    fsmResult.callStatus = CallStatus::CALL_AFTER_DELAY;
+  }
+  if (result == MessageQueueIF::FULL) {
+    return TARGET_MSG_QUEUE_FULL;
+  } else if (result == OK) {
+    fsmResult.packetsSent += 1;
+  }
+  return result;
+}
+
+ReturnValue_t cfdp::SourceHandler::noticeOfCompletion() {
+  if (sourceParams.cfg.indicCfg.transactionFinishedIndicRequired) {
+    cfdp::TransactionFinishedParams params(transactionParams.id, ConditionCode::NO_ERROR,
+                                           FileDeliveryCode::DATA_COMPLETE,
+                                           FileDeliveryStatus::RETAINED_IN_FILESTORE);
+    sourceParams.user.transactionFinishedIndication(params);
+  }
+  return OK;
+}
+
+ReturnValue_t cfdp::SourceHandler::reset() {
+  step = TransactionStep::IDLE;
+  state = cfdp::CfdpState::IDLE;
+  fsmResult.callStatus = CallStatus::DONE;
+  transactionParams.reset();
+  return OK;
+}
+cfdp::CfdpState cfdp::SourceHandler::getState() const { return state; }
+
+cfdp::SourceHandler::TransactionStep cfdp::SourceHandler::getStep() const { return step; }
+
+void cfdp::SourceHandler::addError(ReturnValue_t error) {
+  if (fsmResult.errors < fsmResult.errorCodes.size()) {
+    fsmResult.errorCodes[fsmResult.errors] = error;
+    fsmResult.errors++;
+    fsmResult.result = error;
+  }
+}

src/fsfw/cfdp/handler/SourceHandler.h

@@ -1,6 +1,110 @@
 #ifndef FSFW_CFDP_CFDPSOURCEHANDLER_H
 #define FSFW_CFDP_CFDPSOURCEHANDLER_H
 
-class SourceHandler {};
+#include <cstdint>
+#include <vector>
+
+#include "UserBase.h"
+#include "defs.h"
+#include "fsfw/cfdp/Fss.h"
+#include "fsfw/cfdp/handler/PutRequest.h"
+#include "fsfw/cfdp/handler/mib.h"
+#include "fsfw/events/EventReportingProxyIF.h"
+#include "fsfw/storagemanager/StorageManagerIF.h"
+#include "fsfw/tmtcservices/AcceptsTelemetryIF.h"
+#include "fsfw/util/ProvidesSeqCountIF.h"
+
+namespace cfdp {
+
+struct SourceHandlerParams {
+  SourceHandlerParams(LocalEntityCfg cfg, UserBase& user, ProvidesSeqCountIF& seqCountProvider)
+      : cfg(std::move(cfg)), user(user), seqCountProvider(seqCountProvider) {}
+
+  LocalEntityCfg cfg;
+  UserBase& user;
+  ProvidesSeqCountIF& seqCountProvider;
+};
+
+class SourceHandler {
+ public:
+  enum class TransactionStep : uint8_t {
+    IDLE = 0,
+    TRANSACTION_START = 1,
+    SENDING_METADATA = 3,
+    SENDING_FILE_DATA = 4,
+    SENDING_EOF = 5,
+    WAIT_FOR_ACK = 6,
+    WAIT_FOR_FINISH = 7,
+    NOTICE_OF_COMPLETION = 8
+  };
+  struct FsmResult {
+   public:
+    ReturnValue_t result = returnvalue::OK;
+    CallStatus callStatus = CallStatus::CALL_AFTER_DELAY;
+    CfdpState state = CfdpState::IDLE;
+    uint32_t packetsSent = 0;
+    uint8_t errors = 0;
+    std::array<ReturnValue_t, 3> errorCodes = {};
+  };
+
+  SourceHandler(SourceHandlerParams params, FsfwParams fsfwParams);
+
+  [[nodiscard]] CfdpState getState() const;
+  [[nodiscard]] TransactionStep getStep() const;
+
+  /**
+   * Pass a put request to the source handler, which might initiate a CFDP transaction and start
+   * the state machine
+   * @return
+   */
+  ReturnValue_t transactionStart(PutRequest& putRequest, RemoteEntityCfg& cfg);
+  const FsmResult& stateMachine();
+
+  ReturnValue_t initialize();
+
+ private:
+  struct TransactionParams {
+    uint32_t crc{};
+    std::array<char, UINT8_MAX + 1> sourceName{};
+    size_t sourceNameSize = 0;
+    std::array<char, UINT8_MAX + 1> destName{};
+    size_t destNameSize = 0;
+    cfdp::Fss fileSize;
+    size_t progress = 0;
+    bool closureRequested = false;
+    ChecksumType checksumType = ChecksumType::NULL_CHECKSUM;
+    RemoteEntityCfg remoteCfg;
+    PduConfig pduConf;
+    cfdp::TransactionId id{};
+
+    void reset() {
+      sourceNameSize = 0;
+      destNameSize = 0;
+      fileSize.setFileSize(0, false);
+      progress = 0;
+      closureRequested = false;
+    }
+  } transactionParams;
+
+  cfdp::CfdpState state = cfdp::CfdpState::IDLE;
+  TransactionStep step = TransactionStep::IDLE;
+  std::array<uint8_t, 4096> fileBuf{};
+  SourceHandlerParams sourceParams;
+  cfdp::FsfwParams fsfwParams;
+  FsmResult fsmResult;
+
+  FsmResult& fsmNacked();
+  ReturnValue_t checksumGeneration();
+  ReturnValue_t prepareAndSendMetadataPdu();
+  ReturnValue_t prepareAndSendNextFileDataPdu(bool& noFileDataPdu);
+  ReturnValue_t prepareAndSendEofPdu();
+  ReturnValue_t noticeOfCompletion();
+  ReturnValue_t reset();
+
+  [[nodiscard]] ReturnValue_t sendGenericPdu(const SerializeIF& pdu);
+  void addError(ReturnValue_t error);
+};
+
+}  // namespace cfdp
 
 #endif  // FSFW_CFDP_CFDPSOURCEHANDLER_H

src/fsfw/cfdp/handler/UserBase.h

@@ -6,6 +6,7 @@
 #include <vector>
 
 #include "StatusReportIF.h"
+#include "fsfw/cfdp/Fss.h"
 #include "fsfw/cfdp/VarLenFields.h"
 #include "fsfw/cfdp/tlv/FilestoreResponseTlv.h"
 #include "fsfw/cfdp/tlv/MessageToUserTlv.h"
@@ -27,14 +28,14 @@ struct TransactionFinishedParams {
 };
 
 struct MetadataRecvdParams {
-  MetadataRecvdParams(const TransactionId& id, const EntityId& sourceId)
+  MetadataRecvdParams(const TransactionId& id, const EntityId& sourceId, Fss fileSize)
-      : id(id), sourceId(sourceId) {}
+      : id(id), sourceId(sourceId), fileSize(std::move(fileSize)) {}
   const TransactionId& id;
   const EntityId& sourceId;
-  uint64_t fileSize = 0;
+  Fss fileSize{};
   const char* sourceFileName = "";
   const char* destFileName = "";
-  size_t msgsToUserLen = 0;
+  size_t numberOfMsgsToUser = 0;
   const MessageToUserTlv* msgsToUserArray = nullptr;
 };
 
@@ -65,6 +66,7 @@ struct FileSegmentRecvdParams {
  */
 class UserBase {
   friend class DestHandler;
+  friend class SourceHandler;
 
  public:
   explicit UserBase(HasFileSystemIF& vfs);

src/fsfw/cfdp/handler/defs.h

@@ -1,11 +1,54 @@
 #ifndef FSFW_CFDP_HANDLER_DEFS_H
 #define FSFW_CFDP_HANDLER_DEFS_H
 
+#include <etl/list.h>
+
+#include "fsfw/storagemanager/StorageManagerIF.h"
+#include "fsfw/storagemanager/storeAddress.h"
+#include "fsfw/tmtcservices/AcceptsTelemetryIF.h"
+
 namespace cfdp {
 
-enum class CfdpStates { IDLE, BUSY_CLASS_1_NACKED, BUSY_CLASS_2_ACKED, SUSPENDED };
+enum class CfdpState { IDLE, BUSY_CLASS_1_NACKED, BUSY_CLASS_2_ACKED, SUSPENDED };
 
 static constexpr uint8_t SSID = SUBSYSTEM_ID::CFDP;
+static constexpr uint8_t CID = CLASS_ID::CFDP_HANDLER;
+
+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;
+};
+
+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;
+};
+
+template <size_t SIZE>
+using PacketInfoList = etl::list<PacketInfo, SIZE>;
+using PacketInfoListBase = etl::ilist<PacketInfo>;
+
+enum class CallStatus { DONE, CALL_AFTER_DELAY, CALL_AGAIN };
 
 namespace events {
 
@@ -15,8 +58,19 @@ static constexpr Event SERIALIZATION_ERROR = event::makeEvent(SSID, 2, severity:
 static constexpr Event FILESTORE_ERROR = event::makeEvent(SSID, 3, severity::LOW);
 //! [EXPORT] : [COMMENT] P1: Transaction step ID, P2: 0 for source file name, 1 for dest file name
 static constexpr Event FILENAME_TOO_LARGE_ERROR = event::makeEvent(SSID, 4, severity::LOW);
+//! [EXPORT] : [COMMENT] CFDP request handling failed. P2: Returncode.
+static constexpr Event HANDLING_CFDP_REQUEST_FAILED = event::makeEvent(SSID, 5, severity::LOW);
 
 }  // namespace events
 
+static constexpr ReturnValue_t SOURCE_TRANSACTION_PENDING = returnvalue::makeCode(CID, 0);
+static constexpr ReturnValue_t FILE_DOES_NOT_EXIST = returnvalue::makeCode(CID, 1);
+static constexpr ReturnValue_t FILE_SEGMENT_LEN_INVALID = returnvalue::makeCode(CID, 2);
+static constexpr ReturnValue_t SOURCE_NAME_EMPTY = returnvalue::makeCode(CID, 3);
+static constexpr ReturnValue_t DEST_NAME_EMPTY = returnvalue::makeCode(CID, 4);
+static constexpr ReturnValue_t WRONG_REMOTE_CFG_ENTITY_ID = returnvalue::makeCode(CID, 5);
+static constexpr ReturnValue_t TARGET_MSG_QUEUE_FULL = returnvalue::makeCode(CID, 6);
+static constexpr ReturnValue_t TM_STORE_FULL = returnvalue::makeCode(CID, 7);
+
 }  // namespace cfdp
 #endif  // FSFW_CFDP_HANDLER_DEFS_H

src/fsfw/cfdp/handler/mib.h

@@ -27,14 +27,15 @@ struct LocalEntityCfg {
 };
 
 struct RemoteEntityCfg {
+  RemoteEntityCfg() = default;
   explicit RemoteEntityCfg(EntityId id) : remoteId(std::move(id)) {}
   EntityId remoteId;
-  size_t maxFileSegmentLen = 2048;
+  size_t maxFileSegmentLen = 1024;
   bool closureRequested = false;
   bool crcOnTransmission = false;
   TransmissionMode defaultTransmissionMode = TransmissionMode::UNACKNOWLEDGED;
   ChecksumType defaultChecksum = ChecksumType::NULL_CHECKSUM;
-  const uint8_t version = CFDP_VERSION_2;
+  uint8_t version = CFDP_VERSION_2;
 };
 
 }  // namespace cfdp

src/fsfw/cfdp/pdu/CMakeLists.txt

@@ -17,7 +17,7 @@ target_sources(
           FinishedInfo.cpp
           FinishedPduCreator.cpp
           FinishedPduReader.cpp
-          MetadataInfo.cpp
+          MetadataGenericInfo.cpp
           MetadataPduCreator.cpp
           MetadataPduReader.cpp
           KeepAlivePduCreator.cpp

src/fsfw/cfdp/pdu/EofInfo.cpp

@@ -1,8 +1,13 @@
 #include "EofInfo.h"
 
-EofInfo::EofInfo(cfdp::ConditionCode conditionCode, uint32_t checksum, cfdp::FileSize fileSize,
+#include <utility>
+
+EofInfo::EofInfo(cfdp::ConditionCode conditionCode, uint32_t checksum, cfdp::Fss fileSize,
                  EntityIdTlv* faultLoc)
-    : conditionCode(conditionCode), checksum(checksum), fileSize(fileSize), faultLoc(faultLoc) {}
+    : conditionCode(conditionCode),
+      checksum(checksum),
+      fileSize(std::move(fileSize)),
+      faultLoc(faultLoc) {}
 
 EofInfo::EofInfo(EntityIdTlv* faultLoc)
     : conditionCode(cfdp::ConditionCode::NO_CONDITION_FIELD),
@@ -16,15 +21,15 @@ cfdp::ConditionCode EofInfo::getConditionCode() const { return conditionCode; }
 
 EntityIdTlv* EofInfo::getFaultLoc() const { return faultLoc; }
 
-cfdp::FileSize& EofInfo::getFileSize() { return fileSize; }
+cfdp::Fss& EofInfo::getFileSize() { return fileSize; }
 
-void EofInfo::setChecksum(uint32_t checksum) { this->checksum = checksum; }
+void EofInfo::setChecksum(uint32_t checksum_) { this->checksum = checksum_; }
 
-void EofInfo::setConditionCode(cfdp::ConditionCode conditionCode) {
+void EofInfo::setConditionCode(cfdp::ConditionCode conditionCode_) {
-  this->conditionCode = conditionCode;
+  this->conditionCode = conditionCode_;
 }
 
-void EofInfo::setFaultLoc(EntityIdTlv* faultLoc) { this->faultLoc = faultLoc; }
+void EofInfo::setFaultLoc(EntityIdTlv* faultLoc_) { this->faultLoc = faultLoc_; }
 
 size_t EofInfo::getSerializedSize(bool fssLarge) {
   // Condition code + spare + 4 byte checksum
@@ -42,6 +47,6 @@ size_t EofInfo::getSerializedSize(bool fssLarge) {
   return size;
 }
 
-ReturnValue_t EofInfo::setFileSize(size_t fileSize, bool isLarge) {
+ReturnValue_t EofInfo::setFileSize(size_t fileSize_, bool isLarge) {
-  return this->fileSize.setFileSize(fileSize, isLarge);
+  return this->fileSize.setFileSize(fileSize_, isLarge);
 }

src/fsfw/cfdp/pdu/EofInfo.h

@@ -1,14 +1,14 @@
 #ifndef FSFW_SRC_FSFW_CFDP_PDU_EOFINFO_H_
 #define FSFW_SRC_FSFW_CFDP_PDU_EOFINFO_H_
 
-#include "../FileSize.h"
+#include "../Fss.h"
 #include "../definitions.h"
 #include "fsfw/cfdp/tlv/EntityIdTlv.h"
 
 struct EofInfo {
  public:
   explicit EofInfo(EntityIdTlv* faultLoc = nullptr);
-  EofInfo(cfdp::ConditionCode conditionCode, uint32_t checksum, cfdp::FileSize fileSize,
+  EofInfo(cfdp::ConditionCode conditionCode, uint32_t checksum, cfdp::Fss fileSize,
           EntityIdTlv* faultLoc = nullptr);
 
   size_t getSerializedSize(bool fssLarge = false);
@@ -17,7 +17,7 @@ struct EofInfo {
   [[nodiscard]] cfdp::ConditionCode getConditionCode() const;
 
   [[nodiscard]] EntityIdTlv* getFaultLoc() const;
-  cfdp::FileSize& getFileSize();
+  cfdp::Fss& getFileSize();
   void setChecksum(uint32_t checksum);
   void setConditionCode(cfdp::ConditionCode conditionCode);
   void setFaultLoc(EntityIdTlv* faultLoc);
@@ -26,7 +26,7 @@ struct EofInfo {
  private:
   cfdp::ConditionCode conditionCode;
   uint32_t checksum;
-  cfdp::FileSize fileSize;
+  cfdp::Fss fileSize;
   EntityIdTlv* faultLoc = nullptr;
 };
 

src/fsfw/cfdp/pdu/FileDataCreator.cpp

@@ -37,7 +37,7 @@ ReturnValue_t FileDataCreator::serialize(uint8_t** buffer, size_t* size, size_t
     *buffer += segmentMetadataLen;
     *size += segmentMetadataLen;
   }
-  cfdp::FileSize& offset = info.getOffset();
+  cfdp::Fss& offset = info.getOffset();
   result = offset.serialize(this->getLargeFileFlag(), buffer, size, maxSize, streamEndianness);
   if (result != returnvalue::OK) {
     return result;

src/fsfw/cfdp/pdu/FileDataInfo.cpp

@@ -1,9 +1,9 @@
 #include "FileDataInfo.h"
 
-FileDataInfo::FileDataInfo(cfdp::FileSize &offset, const uint8_t *fileData, size_t fileSize)
+#include <utility>
-    : offset(offset), fileData(fileData), fileSize(fileSize) {}
 
-FileDataInfo::FileDataInfo(cfdp::FileSize &offset) : offset(offset) {}
+FileDataInfo::FileDataInfo(cfdp::Fss offset, const uint8_t *fileData, size_t fileSize)
+    : offset(std::move(offset)), fileData(fileData), fileSize(fileSize) {}
 
 void FileDataInfo::setSegmentMetadataFlag(bool enable) {
   if (enable) {
@@ -71,7 +71,7 @@ const uint8_t *FileDataInfo::getSegmentMetadata(size_t *segmentMetadataLen_) {
   return segmentMetadata;
 }
 
-cfdp::FileSize &FileDataInfo::getOffset() { return offset; }
+cfdp::Fss &FileDataInfo::getOffset() { return offset; }
 
 void FileDataInfo::setRecordContinuationState(cfdp::RecordContinuationState recContState) {
   this->recContState = recContState;

src/fsfw/cfdp/pdu/FileDataInfo.h

@@ -1,17 +1,17 @@
 #ifndef FSFW_SRC_FSFW_CFDP_PDU_FILEDATAINFO_H_
 #define FSFW_SRC_FSFW_CFDP_PDU_FILEDATAINFO_H_
 
-#include <fsfw/cfdp/FileSize.h>
+#include <fsfw/cfdp/Fss.h>
 #include <fsfw/cfdp/definitions.h>
 
 class FileDataInfo {
  public:
-  explicit FileDataInfo(cfdp::FileSize& offset);
+  FileDataInfo() = default;
-  FileDataInfo(cfdp::FileSize& offset, const uint8_t* fileData, size_t fileSize);
+  FileDataInfo(cfdp::Fss offset, const uint8_t* fileData, size_t fileSize);
 
   [[nodiscard]] size_t getSerializedSize(bool largeFile = false) const;
 
-  cfdp::FileSize& getOffset();
+  cfdp::Fss& getOffset();
   const uint8_t* getFileData(size_t* fileSize = nullptr) const;
   void setFileData(const uint8_t* fileData, size_t fileSize);
 
@@ -33,7 +33,7 @@ class FileDataInfo {
  private:
   cfdp::SegmentMetadataFlag segmentMetadataFlag = cfdp::SegmentMetadataFlag::NOT_PRESENT;
   cfdp::SegmentationControl segCtrl = cfdp::SegmentationControl::NO_RECORD_BOUNDARIES_PRESERVATION;
-  cfdp::FileSize& offset;
+  cfdp::Fss offset;
   const uint8_t* fileData = nullptr;
   size_t fileSize = 0;
   cfdp::RecordContinuationState recContState = cfdp::RecordContinuationState::NO_START_NO_END;

src/fsfw/cfdp/pdu/HeaderReader.cpp

@@ -103,11 +103,11 @@ void PduHeaderReader::getTransactionSeqNum(cfdp::TransactionSeqNum &seqNum) cons
 }
 
 void PduHeaderReader::assignVarLenField(cfdp::VarLenField *field, cfdp::WidthInBytes width,
-                                        void *sourcePtr) const {
+                                        void *sourcePtr) {
   switch (width) {
     case (cfdp::WidthInBytes::ONE_BYTE): {
       auto *fieldTyped = static_cast<uint8_t *>(sourcePtr);
-      field->setValue(width, *fieldTyped);
+      field->setValueAndWidth(width, *fieldTyped);
       break;
     }
     case (cfdp::WidthInBytes::TWO_BYTES): {
@@ -115,7 +115,7 @@ void PduHeaderReader::assignVarLenField(cfdp::VarLenField *field, cfdp::WidthInB
       size_t deserSize = 0;
       SerializeAdapter::deSerialize(&fieldTyped, static_cast<uint8_t *>(sourcePtr), &deserSize,
                                     SerializeIF::Endianness::NETWORK);
-      field->setValue(width, fieldTyped);
+      field->setValueAndWidth(width, fieldTyped);
       break;
     }
     case (cfdp::WidthInBytes::FOUR_BYTES): {
@@ -123,7 +123,15 @@ void PduHeaderReader::assignVarLenField(cfdp::VarLenField *field, cfdp::WidthInB
       size_t deserSize = 0;
       SerializeAdapter::deSerialize(&fieldTyped, static_cast<uint8_t *>(sourcePtr), &deserSize,
                                     SerializeIF::Endianness::NETWORK);
-      field->setValue(width, fieldTyped);
+      field->setValueAndWidth(width, fieldTyped);
+      break;
+    }
+    case (cfdp::WidthInBytes::EIGHT_BYTES): {
+      uint64_t fieldTyped = 0;
+      size_t deserSize = 0;
+      SerializeAdapter::deSerialize(&fieldTyped, static_cast<uint8_t *>(sourcePtr), &deserSize,
+                                    SerializeIF::Endianness::NETWORK);
+      field->setValueAndWidth(width, fieldTyped);
       break;
     }
   }

src/fsfw/cfdp/pdu/KeepAlivePduCreator.cpp

@@ -1,6 +1,6 @@
 #include "KeepAlivePduCreator.h"
 
-KeepAlivePduCreator::KeepAlivePduCreator(PduConfig &conf, cfdp::FileSize &progress)
+KeepAlivePduCreator::KeepAlivePduCreator(PduConfig &conf, cfdp::Fss &progress)
     : FileDirectiveCreator(conf, cfdp::FileDirective::KEEP_ALIVE, 4), progress(progress) {
   updateDirectiveFieldLen();
 }

src/fsfw/cfdp/pdu/KeepAlivePduCreator.h

@@ -1,12 +1,12 @@
 #ifndef FSFW_CFDP_PDU_KEEPALIVEPDUSERIALIZER_H_
 #define FSFW_CFDP_PDU_KEEPALIVEPDUSERIALIZER_H_
 
-#include "fsfw/cfdp/FileSize.h"
+#include "fsfw/cfdp/Fss.h"
 #include "fsfw/cfdp/pdu/FileDirectiveCreator.h"
 
 class KeepAlivePduCreator : public FileDirectiveCreator {
  public:
-  KeepAlivePduCreator(PduConfig& conf, cfdp::FileSize& progress);
+  KeepAlivePduCreator(PduConfig& conf, cfdp::Fss& progress);
 
   void updateDirectiveFieldLen();
 
@@ -16,7 +16,7 @@ class KeepAlivePduCreator : public FileDirectiveCreator {
                           Endianness streamEndianness) const override;
 
  private:
-  cfdp::FileSize& progress;
+  cfdp::Fss& progress;
 };
 
 #endif /* FSFW_CFDP_PDU_KEEPALIVEPDUSERIALIZER_H_ */

src/fsfw/cfdp/pdu/KeepAlivePduReader.cpp

@@ -1,7 +1,6 @@
 #include "KeepAlivePduReader.h"
 
-KeepAlivePduReader::KeepAlivePduReader(const uint8_t* pduBuf, size_t maxSize,
+KeepAlivePduReader::KeepAlivePduReader(const uint8_t* pduBuf, size_t maxSize, cfdp::Fss& progress)
-                                       cfdp::FileSize& progress)
     : FileDirectiveReader(pduBuf, maxSize), progress(progress) {}
 
 ReturnValue_t KeepAlivePduReader::parseData() {
@@ -15,4 +14,4 @@ ReturnValue_t KeepAlivePduReader::parseData() {
   return progress.deSerialize(&buffer, &remLen, getEndianness());
 }
 
-cfdp::FileSize& KeepAlivePduReader::getProgress() { return progress; }
+cfdp::Fss& KeepAlivePduReader::getProgress() { return progress; }

src/fsfw/cfdp/pdu/KeepAlivePduReader.h

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

src/fsfw/cfdp/pdu/MetadataGenericInfo.cpp

@@ -0,0 +1,35 @@
+#include "MetadataGenericInfo.h"
+
+MetadataGenericInfo::MetadataGenericInfo(bool closureRequested, cfdp::ChecksumType checksumType,
+                                         cfdp::Fss fileSize)
+    : MetadataGenericInfo(std::move(fileSize)) {
+  this->closureRequested = closureRequested;
+  this->checksumType = checksumType;
+}
+
+MetadataGenericInfo::MetadataGenericInfo(cfdp::Fss fileSize) : fileSize(std::move(fileSize)) {}
+
+cfdp::ChecksumType MetadataGenericInfo::getChecksumType() const { return checksumType; }
+
+void MetadataGenericInfo::setChecksumType(cfdp::ChecksumType checksumType_) {
+  checksumType = checksumType_;
+}
+
+bool MetadataGenericInfo::isClosureRequested() const { return closureRequested; }
+
+void MetadataGenericInfo::setClosureRequested(bool closureRequested_) {
+  closureRequested = closureRequested_;
+}
+
+const cfdp::Fss& MetadataGenericInfo::getFileSize() const { return fileSize; }
+
+size_t MetadataGenericInfo::getSerializedSize(bool fssLarge) {
+  // 1 byte + minimal FSS 4 bytes
+  size_t size = 5;
+  if (fssLarge) {
+    size += 4;
+  }
+  return size;
+}
+
+cfdp::Fss& MetadataGenericInfo::getMutFileSize() { return fileSize; }

src/fsfw/cfdp/pdu/MetadataGenericInfo.h

@@ -0,0 +1,35 @@
+#ifndef FSFW_SRC_FSFW_CFDP_PDU_METADATAINFO_H_
+#define FSFW_SRC_FSFW_CFDP_PDU_METADATAINFO_H_
+
+#include <optional>
+
+#include "fsfw/cfdp/Fss.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 MetadataGenericInfo {
+ public:
+  MetadataGenericInfo() = default;
+  explicit MetadataGenericInfo(cfdp::Fss fileSize);
+  MetadataGenericInfo(bool closureRequested, cfdp::ChecksumType checksumType, cfdp::Fss fileSize);
+
+  static size_t getSerializedSize(bool fssLarge = false);
+
+  [[nodiscard]] cfdp::ChecksumType getChecksumType() const;
+  void setChecksumType(cfdp::ChecksumType checksumType);
+  [[nodiscard]] bool isClosureRequested() const;
+  void setClosureRequested(bool closureRequested = false);
+
+  [[nodiscard]] const cfdp::Fss& getFileSize() const;
+
+  cfdp::Fss& getMutFileSize();
+
+ private:
+  bool closureRequested = false;
+  cfdp::ChecksumType checksumType = cfdp::ChecksumType::NULL_CHECKSUM;
+  cfdp::Fss fileSize;
+};
+
+#endif /* FSFW_SRC_FSFW_CFDP_PDU_METADATAINFO_H_ */

src/fsfw/cfdp/pdu/MetadataInfo.cpp

@@ -1,103 +0,0 @@
-#include "MetadataInfo.h"
-
-MetadataInfo::MetadataInfo(bool closureRequested, cfdp::ChecksumType checksumType,
-                           cfdp::FileSize& fileSize, cfdp::StringLv& sourceFileName,
-                           cfdp::StringLv& destFileName)
-    : MetadataInfo(fileSize, sourceFileName, destFileName) {
-  this->closureRequested = closureRequested;
-  this->checksumType = checksumType;
-}
-
-MetadataInfo::MetadataInfo(cfdp::FileSize& fileSize, cfdp::StringLv& sourceFileName,
-                           cfdp::StringLv& destFileName)
-    : fileSize(fileSize), sourceFileName(sourceFileName), destFileName(destFileName) {}
-
-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_) {
-    this->optionsLen = optionsLen_.value();
-  }
-}
-
-cfdp::ChecksumType MetadataInfo::getChecksumType() const { return checksumType; }
-
-void MetadataInfo::setChecksumType(cfdp::ChecksumType checksumType_) {
-  checksumType = checksumType_;
-}
-
-bool MetadataInfo::isClosureRequested() const { return closureRequested; }
-
-void MetadataInfo::setClosureRequested(bool closureRequested_) {
-  closureRequested = closureRequested_;
-}
-
-cfdp::StringLv& MetadataInfo::getDestFileName() { return destFileName; }
-
-cfdp::FileSize& MetadataInfo::getFileSize() { return fileSize; }
-
-ReturnValue_t MetadataInfo::getOptions(cfdp::Tlv*** optionsArray_, size_t* optionsLen_,
-                                       size_t* maxOptsLen) {
-  if (optionsArray_ == nullptr or optionsArray == nullptr) {
-    return returnvalue::FAILED;
-  }
-  *optionsArray_ = optionsArray;
-  if (optionsLen_ != nullptr) {
-    *optionsLen_ = this->optionsLen;
-  }
-  if (maxOptsLen != nullptr) {
-    *maxOptsLen = this->maxOptionsLen;
-  }
-  return returnvalue::OK;
-}
-
-bool MetadataInfo::hasOptions() const {
-  if (optionsArray != nullptr and optionsLen > 0) {
-    return true;
-  }
-  return false;
-}
-
-bool MetadataInfo::canHoldOptions() const {
-  if (optionsArray != nullptr and maxOptionsLen > 0) {
-    return true;
-  }
-  return false;
-}
-
-size_t MetadataInfo::getSerializedSize(bool fssLarge) {
-  // 1 byte + minimal FSS 4 bytes
-  size_t size = 5;
-  if (fssLarge) {
-    size += 4;
-  }
-  size += sourceFileName.getSerializedSize();
-  size += destFileName.getSerializedSize();
-  if (hasOptions()) {
-    for (size_t idx = 0; idx < optionsLen; idx++) {
-      size += optionsArray[idx]->getSerializedSize();
-    }
-  }
-  return size;
-}
-
-void MetadataInfo::setDestFileName(cfdp::StringLv& destFileName_) {
-  this->destFileName = destFileName_;
-}
-
-void MetadataInfo::setSourceFileName(cfdp::StringLv& sourceFileName_) {
-  this->sourceFileName = sourceFileName_;
-}
-
-size_t MetadataInfo::getMaxOptionsLen() const { return 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_; }
-
-cfdp::StringLv& MetadataInfo::getSourceFileName() { return sourceFileName; }

src/fsfw/cfdp/pdu/MetadataInfo.h

@@ -1,55 +0,0 @@
-#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::StringLv& sourceFileName, cfdp::StringLv& destFileName);
-
-  size_t getSerializedSize(bool fssLarge = false);
-
-  void setOptionsArray(cfdp::Tlv** optionsArray, std::optional<size_t> optionsLen,
-                       std::optional<size_t> maxOptionsLen);
-  [[nodiscard]] cfdp::ChecksumType getChecksumType() const;
-  void setChecksumType(cfdp::ChecksumType checksumType);
-  [[nodiscard]] bool isClosureRequested() const;
-  void setClosureRequested(bool closureRequested = false);
-
-  void setDestFileName(cfdp::StringLv& destFileName);
-  void setSourceFileName(cfdp::StringLv& sourceFileName);
-
-  cfdp::StringLv& getDestFileName();
-  cfdp::StringLv& getSourceFileName();
-  cfdp::FileSize& getFileSize();
-
-  [[nodiscard]] bool hasOptions() const;
-  [[nodiscard]] bool canHoldOptions() const;
-  ReturnValue_t getOptions(cfdp::Tlv*** optionsArray, size_t* optionsLen, size_t* maxOptsLen);
-  void setOptionsLen(size_t optionsLen);
-  [[nodiscard]] size_t getOptionsLen() const;
-  void setMaxOptionsLen(size_t maxOptionsLen);
-  [[nodiscard]] size_t getMaxOptionsLen() const;
-
- private:
-  bool closureRequested = false;
-  cfdp::ChecksumType checksumType = cfdp::ChecksumType::NULL_CHECKSUM;
-  cfdp::FileSize& fileSize;
-  cfdp::StringLv& sourceFileName;
-  cfdp::StringLv& destFileName;
-
-  cfdp::Tlv** optionsArray = nullptr;
-  size_t optionsLen = 0;
-  size_t maxOptionsLen = 0;
-};
-
-#endif /* FSFW_SRC_FSFW_CFDP_PDU_METADATAINFO_H_ */

src/fsfw/cfdp/pdu/MetadataPduCreator.cpp

@@ -1,12 +1,26 @@
 #include "MetadataPduCreator.h"
 
-MetadataPduCreator::MetadataPduCreator(PduConfig &conf, MetadataInfo &info)
+MetadataPduCreator::MetadataPduCreator(PduConfig &conf, MetadataGenericInfo &info,
-    : FileDirectiveCreator(conf, cfdp::FileDirective::METADATA, 5), info(info) {
+                                       cfdp::StringLv &srcFileName, cfdp::StringLv &destFileName,
+                                       cfdp::Tlv **optionsArray, size_t optionsLen)
+    : FileDirectiveCreator(conf, cfdp::FileDirective::METADATA, 5),
+      info(info),
+      srcFileName(srcFileName),
+      destFileName(destFileName),
+      optionsArray(optionsArray),
+      optionsLen(optionsLen) {
   updateDirectiveFieldLen();
 }
 
 void MetadataPduCreator::updateDirectiveFieldLen() {
-  setDirectiveDataFieldLen(info.getSerializedSize(getLargeFileFlag()));
+  size_t dirFieldLen = MetadataGenericInfo::getSerializedSize(HeaderCreator::getLargeFileFlag()) +
+                       srcFileName.getSerializedSize() + destFileName.getSerializedSize();
+  if (optionsLen > 0 and optionsArray != nullptr) {
+    for (size_t idx = 0; idx < optionsLen; idx++) {
+      dirFieldLen += optionsArray[idx]->getSerializedSize();
+    }
+  }
+  setDirectiveDataFieldLen(dirFieldLen);
 }
 
 size_t MetadataPduCreator::getSerializedSize() const {
@@ -29,21 +43,18 @@ ReturnValue_t MetadataPduCreator::serialize(uint8_t **buffer, size_t *size, size
   if (result != returnvalue::OK) {
     return result;
   }
-  result = info.getSourceFileName().serialize(buffer, size, maxSize, streamEndianness);
+  result = srcFileName.serialize(buffer, size, maxSize, streamEndianness);
   if (result != returnvalue::OK) {
     return result;
   }
-  result = info.getDestFileName().serialize(buffer, size, maxSize, streamEndianness);
+  result = destFileName.serialize(buffer, size, maxSize, streamEndianness);
   if (result != returnvalue::OK) {
     return result;
   }
 
-  if (info.hasOptions()) {
+  if (optionsLen > 0 and optionsArray != nullptr) {
-    cfdp::Tlv **optsArray = nullptr;
+    for (size_t idx = 0; idx < optionsLen; idx++) {
-    size_t optsLen = 0;
+      result = optionsArray[idx]->serialize(buffer, size, maxSize, streamEndianness);
-    info.getOptions(&optsArray, &optsLen, nullptr);
-    for (size_t idx = 0; idx < optsLen; idx++) {
-      result = optsArray[idx]->serialize(buffer, size, maxSize, streamEndianness);
       if (result != returnvalue::OK) {
         return result;
       }
@@ -51,3 +62,5 @@ ReturnValue_t MetadataPduCreator::serialize(uint8_t **buffer, size_t *size, size
   }
   return result;
 }
+const cfdp::StringLv &MetadataPduCreator::getSourceFileName() const { return srcFileName; }
+const cfdp::StringLv &MetadataPduCreator::getDestFileName() const { return destFileName; }

src/fsfw/cfdp/pdu/MetadataPduCreator.h

@@ -2,22 +2,30 @@
 #define FSFW_CFDP_PDU_METADATAPDUCREATOR_H_
 
 #include "fsfw/cfdp/pdu/FileDirectiveCreator.h"
-#include "fsfw/cfdp/pdu/MetadataInfo.h"
+#include "fsfw/cfdp/pdu/MetadataGenericInfo.h"
 
 class MetadataPduCreator : public FileDirectiveCreator {
  public:
-  MetadataPduCreator(PduConfig& conf, MetadataInfo& info);
+  MetadataPduCreator(PduConfig& conf, MetadataGenericInfo& info, cfdp::StringLv& srcFileName,
+                     cfdp::StringLv& destFileName, cfdp::Tlv** optionsArray, size_t optionsLen);
 
   void updateDirectiveFieldLen();
 
   [[nodiscard]] size_t getSerializedSize() const override;
 
+  const cfdp::StringLv& getSourceFileName() const;
+  const cfdp::StringLv& getDestFileName() const;
+
   ReturnValue_t serialize(uint8_t** buffer, size_t* size, size_t maxSize,
                           Endianness streamEndianness) const override;
   using FileDirectiveCreator::serialize;
 
  private:
-  MetadataInfo& info;
+  MetadataGenericInfo& info;
+  cfdp::StringLv& srcFileName;
+  cfdp::StringLv& destFileName;
+  cfdp::Tlv** optionsArray;
+  size_t optionsLen;
 };
 
 #endif /* FSFW_CFDP_PDU_METADATAPDUCREATOR_H_ */

src/fsfw/cfdp/pdu/MetadataPduReader.cpp

@@ -1,9 +1,15 @@
 #include "MetadataPduReader.h"
 
-MetadataPduReader::MetadataPduReader(const uint8_t* pduBuf, size_t maxSize, MetadataInfo& info)
+MetadataPduReader::MetadataPduReader(const uint8_t* pduBuf, size_t maxSize,
-    : FileDirectiveReader(pduBuf, maxSize), info(info) {}
+                                     MetadataGenericInfo& info, cfdp::Tlv* optionsArray,
+                                     size_t optArrayMaxSize)
+    : FileDirectiveReader(pduBuf, maxSize),
+      info(info),
+      optionArray(optionsArray),
+      optionArrayMaxSize(optArrayMaxSize) {}
 
 ReturnValue_t MetadataPduReader::parseData() {
+  parsedOptions = 0;
   ReturnValue_t result = FileDirectiveReader::parseData();
   if (result != returnvalue::OK) {
     return result;
@@ -19,39 +25,43 @@ ReturnValue_t MetadataPduReader::parseData() {
   remSize -= 1;
   buf += 1;
   auto endianness = getEndianness();
-  result = info.getFileSize().deSerialize(&buf, &remSize, endianness);
+  result = info.getMutFileSize().deSerialize(&buf, &remSize, endianness);
   if (result != returnvalue::OK) {
     return result;
   }
-  result = info.getSourceFileName().deSerialize(&buf, &remSize, endianness);
+  result = srcFileName.deSerialize(&buf, &remSize, endianness);
   if (result != returnvalue::OK) {
     return result;
   }
-  result = info.getDestFileName().deSerialize(&buf, &remSize, endianness);
+  result = destFileName.deSerialize(&buf, &remSize, endianness);
   if (result != returnvalue::OK) {
     return result;
   }
 
-  info.setOptionsLen(0);
   if (remSize > 0) {
-    if (not info.canHoldOptions()) {
+    if (optionArrayMaxSize == 0 or optionArray == nullptr) {
       return cfdp::METADATA_CANT_PARSE_OPTIONS;
     }
-    cfdp::Tlv** optionsArray = nullptr;
-    size_t optsMaxLen = 0;
     size_t optsIdx = 0;
-    info.getOptions(&optionsArray, nullptr, &optsMaxLen);
     while (remSize > 0) {
-      if (optsIdx > optsMaxLen) {
+      if (optsIdx > optionArrayMaxSize) {
         return cfdp::METADATA_CANT_PARSE_OPTIONS;
       }
-      result = optionsArray[optsIdx]->deSerialize(&buf, &remSize, endianness);
+      result = optionArray[optsIdx].deSerialize(&buf, &remSize, endianness);
       if (result != returnvalue::OK) {
         return result;
       }
       optsIdx++;
     }
-    info.setOptionsLen(optsIdx);
+    parsedOptions = optsIdx;
   }
   return result;
 }
+
+size_t MetadataPduReader::getNumberOfParsedOptions() const { return parsedOptions; }
+
+const cfdp::StringLv& MetadataPduReader::getSourceFileName() const { return srcFileName; }
+
+const cfdp::StringLv& MetadataPduReader::getDestFileName() const { return destFileName; }
+
+const MetadataGenericInfo& MetadataPduReader::getGenericInfo() const { return info; }

src/fsfw/cfdp/pdu/MetadataPduReader.h

@@ -2,16 +2,28 @@
 #define FSFW_CFDP_PDU_METADATAPDUREADER_H_
 
 #include "fsfw/cfdp/pdu/FileDirectiveReader.h"
-#include "fsfw/cfdp/pdu/MetadataInfo.h"
+#include "fsfw/cfdp/pdu/MetadataGenericInfo.h"
 
 class MetadataPduReader : public FileDirectiveReader {
  public:
-  MetadataPduReader(const uint8_t* pduBuf, size_t maxSize, MetadataInfo& info);
+  MetadataPduReader(const uint8_t* pduBuf, size_t maxSize, MetadataGenericInfo& info,
+                    cfdp::Tlv* optionsArray, size_t optArrayMaxSize);
 
   ReturnValue_t parseData() override;
 
+  [[nodiscard]] const MetadataGenericInfo& getGenericInfo() const;
+  [[nodiscard]] const cfdp::StringLv& getSourceFileName() const;
+  [[nodiscard]] const cfdp::StringLv& getDestFileName() const;
+
+  [[nodiscard]] size_t getNumberOfParsedOptions() const;
+
  private:
-  MetadataInfo& info;
+  cfdp::StringLv srcFileName;
+  cfdp::StringLv destFileName;
+  MetadataGenericInfo& info;
+  cfdp::Tlv* optionArray;
+  size_t optionArrayMaxSize;
+  size_t parsedOptions = 0;
 };
 
 #endif /* FSFW_CFDP_PDU_METADATAPDUREADER_H_ */

src/fsfw/cfdp/pdu/NakInfo.cpp

@@ -1,6 +1,6 @@
 #include "NakInfo.h"
 
-NakInfo::NakInfo(cfdp::FileSize startOfScope, cfdp::FileSize endOfScope)
+NakInfo::NakInfo(cfdp::Fss startOfScope, cfdp::Fss endOfScope)
     : startOfScope(startOfScope), endOfScope(endOfScope) {}
 
 size_t NakInfo::getSerializedSize(bool fssLarge) {
@@ -57,9 +57,9 @@ void NakInfo::setSegmentRequests(SegmentRequest* segmentRequests, size_t* segmen
   }
 }
 
-cfdp::FileSize& NakInfo::getStartOfScope() { return startOfScope; }
+cfdp::Fss& NakInfo::getStartOfScope() { return startOfScope; }
 
-cfdp::FileSize& NakInfo::getEndOfScope() { return endOfScope; }
+cfdp::Fss& NakInfo::getEndOfScope() { return endOfScope; }
 
 size_t NakInfo::getSegmentRequestsLen() const { return segmentRequestsLen; }
 

src/fsfw/cfdp/pdu/NakInfo.h

@@ -3,21 +3,21 @@
 
 #include <utility>
 
-#include "fsfw/cfdp/FileSize.h"
+#include "fsfw/cfdp/Fss.h"
 
 class NakInfo {
  public:
-  using SegmentRequest = std::pair<cfdp::FileSize, cfdp::FileSize>;
+  using SegmentRequest = std::pair<cfdp::Fss, cfdp::Fss>;
 
-  NakInfo(cfdp::FileSize startOfScope, cfdp::FileSize endOfScope);
+  NakInfo(cfdp::Fss startOfScope, cfdp::Fss endOfScope);
 
   void setSegmentRequests(SegmentRequest* segmentRequests, size_t* segmentRequestLen,
                           size_t* maxSegmentRequestLen);
 
   size_t getSerializedSize(bool fssLarge = false);
 
-  cfdp::FileSize& getStartOfScope();
+  cfdp::Fss& getStartOfScope();
-  cfdp::FileSize& getEndOfScope();
+  cfdp::Fss& getEndOfScope();
 
   bool hasSegmentRequests() const;
   bool canHoldSegmentRequests() const;
@@ -31,8 +31,8 @@ class NakInfo {
   void setSegmentRequestLen(size_t readLen);
 
  private:
-  cfdp::FileSize startOfScope;
+  cfdp::Fss startOfScope;
-  cfdp::FileSize endOfScope;
+  cfdp::Fss endOfScope;
   SegmentRequest* segmentRequests = nullptr;
   size_t segmentRequestsLen = 0;
   size_t maxSegmentRequestsLen = 0;

src/fsfw/cfdp/pdu/NakPduCreator.h

@@ -4,7 +4,7 @@
 #include <vector>
 
 #include "NakInfo.h"
-#include "fsfw/cfdp/FileSize.h"
+#include "fsfw/cfdp/Fss.h"
 #include "fsfw/cfdp/definitions.h"
 #include "fsfw/cfdp/pdu/FileDirectiveCreator.h"
 

src/fsfw/cfdp/pdu/PduHeaderReader.h

@@ -105,7 +105,8 @@ class PduHeaderReader : public RedirectableDataPointerIF, public PduHeaderIF {
    * @return
    */
   ReturnValue_t setData(uint8_t* dataPtr, size_t maxSize, void* args) override;
-  void assignVarLenField(cfdp::VarLenField* field, cfdp::WidthInBytes width, void* sourcePtr) const;
+  static void assignVarLenField(cfdp::VarLenField* field, cfdp::WidthInBytes width,
+                                void* sourcePtr);
   void* sourceIdRaw = nullptr;
   void* seqNumRaw = nullptr;
   void* destIdRaw = nullptr;

src/fsfw/cfdp/tlv/CMakeLists.txt

@@ -8,4 +8,5 @@ target_sources(
           StringLv.cpp
           FlowLabelTlv.cpp
           MessageToUserTlv.cpp
-          FaultHandlerOverrideTlv.cpp)
+          FaultHandlerOverrideTlv.cpp
+          ReservedMessageCreator.cpp)

src/fsfw/cfdp/tlv/Lv.cpp

@@ -14,23 +14,6 @@ cfdp::Lv::Lv(const std::vector<uint8_t>& data) : value(data.data(), data.size(),
 
 cfdp::Lv::Lv() : value(static_cast<uint8_t*>(nullptr), 0, true) {}
 
-cfdp::Lv::Lv(const Lv& other)
-    : value(other.value.getConstBuffer(), other.value.getSerializedSize() - 1, true) {
-  if (other.value.getSerializedSize() - 1 > 0) {
-    zeroLen = false;
-  }
-}
-
-cfdp::Lv& cfdp::Lv::operator=(const Lv& other) {
-  size_t otherSize = 0;
-  auto* otherVal = const_cast<uint8_t*>(other.getValue(&otherSize));
-  if (otherVal == nullptr or otherSize == 0) {
-    this->zeroLen = true;
-  }
-  this->value.setConstBuffer(otherVal, otherSize);
-  return *this;
-}
-
 ReturnValue_t cfdp::Lv::serialize(uint8_t** buffer, size_t* size, size_t maxSize,
                                   Endianness streamEndianness) const {
   if (maxSize < 1) {
@@ -49,10 +32,8 @@ ReturnValue_t cfdp::Lv::serialize(uint8_t** buffer, size_t* size, size_t maxSize
 }
 
 size_t cfdp::Lv::getSerializedSize() const {
-  if (zeroLen) {
+  if (zeroLen or value.getConstBuffer() == nullptr) {
     return 1;
-  } else if (value.getConstBuffer() == nullptr) {
-    return 0;
   }
   return value.getSerializedSize();
 }
@@ -85,7 +66,34 @@ ReturnValue_t cfdp::Lv::deSerialize(const uint8_t** buffer, size_t* size,
 const uint8_t* cfdp::Lv::getValue(size_t* size) const {
   if (size != nullptr) {
     // Length without length field
-    *size = value.getSerializedSize() - 1;
+    *size = getSerializedSize() - 1;
   }
   return value.getConstBuffer();
 }
+cfdp::Lv::Lv(cfdp::Lv&& other) noexcept
+    : value(other.value.getConstBuffer(), other.value.getSerializedSize() - 1, true) {
+  if (other.value.getSerializedSize() - 1 > 0) {
+    zeroLen = false;
+  }
+  // Leave other class in intact state.
+  other.zeroLen = false;
+  other.value = SerialBufferAdapter<uint8_t>();
+}
+
+cfdp::Lv& cfdp::Lv::operator=(cfdp::Lv&& other) noexcept {
+  size_t otherSize = 0;
+  this->zeroLen = false;
+  auto* otherVal = const_cast<uint8_t*>(other.getValue(&otherSize));
+  if (otherVal == nullptr or otherSize == 0) {
+    this->zeroLen = true;
+  }
+  this->value.setConstBuffer(otherVal, otherSize);
+  // Leave other class in intact state.
+  other.zeroLen = false;
+  other.value = SerialBufferAdapter<uint8_t>();
+  return *this;
+}
+
+size_t cfdp::Lv::getValueLen() const { return getSerializedSize() - 1; }
+
+bool cfdp::Lv::isEmpty() const { return zeroLen; }

src/fsfw/cfdp/tlv/Lv.h

@@ -18,8 +18,12 @@ class Lv : public SerializeIF {
   Lv(const uint8_t* value, size_t size);
   Lv();
 
-  Lv(const Lv&);
+  // Semantically, this class is a zero-copy helper, so the copy ctor and copy assigment do not
-  Lv& operator=(const Lv&);
+  // really make sense here.
+  Lv(const Lv&) = delete;
+  Lv& operator=(const Lv&) = delete;
+  Lv(Lv&&) noexcept;
+  Lv& operator=(Lv&&) noexcept;
 
   ReturnValue_t serialize(uint8_t** buffer, size_t* size, size_t maxSize,
                           Endianness streamEndianness) const override;
@@ -36,6 +40,8 @@ class Lv : public SerializeIF {
   ReturnValue_t deSerialize(const uint8_t** buffer, size_t* size,
                             Endianness streamEndianness) override;
 
+  size_t getValueLen() const;
+
   /**
    * Get value field and its size.
    * @param size Optionally retrieve size. Size will be the size of the actual value field
@@ -44,6 +50,8 @@ class Lv : public SerializeIF {
    */
   const uint8_t* getValue(size_t* size) const;
 
+  bool isEmpty() const;
+
  private:
   bool zeroLen = true;
   SerialBufferAdapter<uint8_t> value;

src/fsfw/cfdp/tlv/MessageToUserTlv.cpp

@@ -7,3 +7,22 @@ MessageToUserTlv::MessageToUserTlv() : Tlv() {}
 
 MessageToUserTlv::MessageToUserTlv(const std::vector<uint8_t>& data)
     : Tlv(cfdp::TlvType::MSG_TO_USER, data.data(), data.size()) {}
+
+MessageToUserTlv::MessageToUserTlv(const uint8_t* value, size_t size)
+    : Tlv(cfdp::TlvType::MSG_TO_USER, value, size) {}
+
+bool MessageToUserTlv::isReservedCfdpMessage(uint8_t& messageType, const uint8_t** msgDataStart,
+                                             size_t& msgLen) const {
+  if (cfdp::Tlv::getLengthField() < 5) {
+    return false;
+  }
+  if (std::strncmp(reinterpret_cast<const char*>(getValue()), "cfdp", 4) == 0) {
+    messageType = getValue()[4];
+    if (msgDataStart != nullptr) {
+      *msgDataStart = getValue() + 5;
+    }
+    msgLen = cfdp::Tlv::getSerializedSize() - 5;
+    return true;
+  }
+  return false;
+}

src/fsfw/cfdp/tlv/MessageToUserTlv.h

@@ -9,8 +9,12 @@ class MessageToUserTlv : public cfdp::Tlv {
  public:
   MessageToUserTlv();
   MessageToUserTlv(uint8_t* value, size_t size);
+  MessageToUserTlv(const uint8_t* value, size_t size);
   explicit MessageToUserTlv(const std::vector<uint8_t>& data);
 
+  bool isReservedCfdpMessage(uint8_t& messageType, const uint8_t** msgDataStart,
+                             size_t& msgLen) const;
+
  private:
 };
 

src/fsfw/cfdp/tlv/ReservedMessageCreator.cpp

@@ -0,0 +1,39 @@
+#include "ReservedMessageCreator.h"
+
+cfdp::ReservedMessageCreator::ReservedMessageCreator(uint8_t messageType, uint8_t *msgData,
+                                                     size_t msgLen)
+    : messageType(messageType), msgData(msgData), msgSize(msgLen) {}
+
+ReturnValue_t cfdp::ReservedMessageCreator::serialize(
+    uint8_t **buffer, size_t *size, size_t maxSize,
+    SerializeIF::Endianness streamEndianness) const {
+  if (*size + getSerializedSize() > maxSize) {
+    return SerializeIF::BUFFER_TOO_SHORT;
+  }
+  **buffer = TlvType::MSG_TO_USER;
+  *buffer += 1;
+  *size += 1;
+  **buffer = getSerializedSize() - 2;
+  *size += 1;
+  *buffer += 1;
+  std::memcpy(*buffer, MSG_HEADER, 4);
+  *buffer += 4;
+  *size += 4;
+  **buffer = messageType;
+  *buffer += 1;
+  *size += 1;
+  std::memcpy(*buffer, msgData, msgSize);
+  *buffer += msgSize;
+  *size += msgSize;
+  return returnvalue::OK;
+}
+
+size_t cfdp::ReservedMessageCreator::getSerializedSize() const {
+  // 2 bytes type and length, 4 bytes CFDP, 1 byte reserved message type, message data.
+  return 2 + 5 + msgSize;
+}
+
+ReturnValue_t cfdp::ReservedMessageCreator::deSerialize(const uint8_t **buffer, size_t *size,
+                                                        SerializeIF::Endianness streamEndianness) {
+  return returnvalue::FAILED;
+}

src/fsfw/cfdp/tlv/ReservedMessageCreator.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include "Tlv.h"
+
+namespace cfdp {
+
+class ReservedMessageCreator : public SerializeIF {
+ public:
+  static constexpr char MSG_HEADER[] = "cfdp";
+
+  ReservedMessageCreator(uint8_t messageType, uint8_t *msgData, size_t msgLen);
+  [[nodiscard]] 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(const uint8_t **buffer, size_t *size,
+                            Endianness streamEndianness) override;
+
+ private:
+  uint8_t messageType;
+  uint8_t *msgData;
+  size_t msgSize;
+};
+
+}  // namespace cfdp

src/fsfw/cfdp/tlv/StringLv.cpp

@@ -7,3 +7,12 @@ cfdp::StringLv::StringLv(const char* filename, size_t len)
     : Lv(reinterpret_cast<const uint8_t*>(filename), len) {}
 
 cfdp::StringLv::StringLv() : Lv() {}
+
+const char* cfdp::StringLv::getCString(size_t& fileSize) const {
+  return reinterpret_cast<const char*>(getValue(&fileSize));
+}
+
+std::string cfdp::StringLv::getString() const {
+  size_t fileSize;
+  return {getCString(fileSize), fileSize};
+}

src/fsfw/cfdp/tlv/StringLv.h

@@ -13,6 +13,8 @@ class StringLv : public Lv {
   explicit StringLv(const std::string& fileName);
   explicit StringLv(const char* filename, size_t len);
 
+  const char* getCString(size_t& fileSize) const;
+  std::string getString() const;
   // Delete the move constructor to avoid passing in a temporary
   StringLv(const std::string&&) = delete;
 };

src/fsfw/cfdp/tlv/Tlv.cpp

@@ -54,6 +54,7 @@ ReturnValue_t cfdp::Tlv::deSerialize(const uint8_t **buffer, size_t *size,
     return STREAM_TOO_SHORT;
   }
 
+  rawData = *buffer;
   uint8_t rawType = **buffer;
   if (not checkType(rawType)) {
     return INVALID_TLV_TYPE;
@@ -102,3 +103,5 @@ void cfdp::Tlv::setValue(uint8_t *value, size_t len) {
 uint8_t cfdp::Tlv::getLengthField() const { return this->value.getSerializedSize() - 1; }
 
 void cfdp::Tlv::setType(TlvType type) { this->type = type; }
+
+const uint8_t *cfdp::Tlv::getRawData() const { return rawData; }

src/fsfw/cfdp/tlv/Tlv.h

@@ -47,6 +47,7 @@ class Tlv : public TlvIF {
   void setValue(uint8_t *value, size_t len);
 
   [[nodiscard]] const uint8_t *getValue() const;
+  [[nodiscard]] const uint8_t *getRawData() const;
   void setType(TlvType type);
   [[nodiscard]] TlvType getType() const override;
   [[nodiscard]] uint8_t getLengthField() const override;
@@ -55,6 +56,7 @@ class Tlv : public TlvIF {
   bool checkType(uint8_t rawType);
 
   bool zeroLen = true;
+  const uint8_t *rawData = nullptr;
   TlvType type = TlvType::INVALID_TLV;
   SerialBufferAdapter<uint8_t> value;
 };

src/fsfw/controller/ControllerBase.cpp

@@ -72,18 +72,17 @@ void ControllerBase::getMode(Mode_t* mode_, Submode_t* submode_) {
   *submode_ = this->submode;
 }
 
-void ControllerBase::setToExternalControl() { healthHelper.setHealth(EXTERNAL_CONTROL); }
-
 void ControllerBase::announceMode(bool recursive) { triggerEvent(MODE_INFO, mode, submode); }
 
+void ControllerBase::modeChanged(Mode_t mode_, Submode_t submode_) {}
+
+void ControllerBase::setToExternalControl() { healthHelper.setHealth(EXTERNAL_CONTROL); }
+
 ReturnValue_t ControllerBase::performOperation(uint8_t opCode) {
   handleQueue();
   performControlOperation(opCode);
   return returnvalue::OK;
 }
-
-void ControllerBase::modeChanged(Mode_t mode_, Submode_t submode_) {}
-
 ReturnValue_t ControllerBase::setHealth(HealthState health) {
   switch (health) {
     case HEALTHY:

src/fsfw/coordinates/Sgp4Propagator.cpp

@@ -166,9 +166,9 @@ ReturnValue_t Sgp4Propagator::propagate(double* position, double* velocity, time
   timeval timeSinceEpoch = time - epoch;
   double minutesSinceEpoch = timeSinceEpoch.tv_sec / 60. + timeSinceEpoch.tv_usec / 60000000.;
 
-  double monthsSinceEpoch = minutesSinceEpoch / 60 / 24 / 30;
+  double daysSinceEpoch = minutesSinceEpoch / 60 / 24;
 
-  if ((monthsSinceEpoch > 1) || (monthsSinceEpoch < -1)) {
+  if ((daysSinceEpoch > 7) || (daysSinceEpoch < -7)) {
     return TLE_TOO_OLD;
   }
 

src/fsfw/devicehandlers/CMakeLists.txt

@@ -7,4 +7,5 @@ target_sources(
           DeviceHandlerFailureIsolation.cpp
           DeviceHandlerMessage.cpp
           DeviceTmReportingWrapper.cpp
+          FreshDeviceHandlerBase.cpp
           HealthDevice.cpp)

src/fsfw/devicehandlers/DeviceHandlerIF.h

@@ -85,6 +85,7 @@ class DeviceHandlerIF {
   static const ReturnValue_t NO_REPLY_EXPECTED = MAKE_RETURN_CODE(0xA8);
   static const ReturnValue_t NON_OP_TEMPERATURE = MAKE_RETURN_CODE(0xA9);
   static const ReturnValue_t COMMAND_NOT_IMPLEMENTED = MAKE_RETURN_CODE(0xAA);
+  static const ReturnValue_t NON_OP_STATE_OF_CHARGE = MAKE_RETURN_CODE(0xAB);
 
   // Standard codes used in scanForReply
   static const ReturnValue_t CHECKSUM_ERROR = MAKE_RETURN_CODE(0xB0);

src/fsfw/devicehandlers/FreshDeviceHandlerBase.cpp

@@ -0,0 +1,201 @@
+#include "FreshDeviceHandlerBase.h"
+
+#include "fsfw/devicehandlers/DeviceHandlerFailureIsolation.h"
+#include "fsfw/ipc/QueueFactory.h"
+#include "fsfw/subsystem/helper.h"
+
+FreshDeviceHandlerBase::FreshDeviceHandlerBase(DhbConfig config)
+    : SystemObject(config.objectId),
+      actionHelper(this, nullptr),
+      modeHelper(this),
+      healthHelper(this, getObjectId()),
+      paramHelper(this),
+      poolManager(this, nullptr),
+      defaultFdirParent(config.defaultFdirParent) {
+  auto mqArgs = MqArgs(config.objectId, static_cast<void*>(this));
+  messageQueue = QueueFactory::instance()->createMessageQueue(
+      config.msgQueueDepth, MessageQueueMessage::MAX_MESSAGE_SIZE, &mqArgs);
+}
+FreshDeviceHandlerBase::~FreshDeviceHandlerBase() {
+  QueueFactory::instance()->deleteMessageQueue(messageQueue);
+  if (not hasCustomFdir) {
+    delete fdirInstance;
+  }
+}
+
+[[nodiscard]] object_id_t FreshDeviceHandlerBase::getObjectId() const {
+  return SystemObject::getObjectId();
+}
+
+ReturnValue_t FreshDeviceHandlerBase::performOperation(uint8_t opCode) {
+  performDeviceOperationPreQueueHandling(opCode);
+  handleQueue();
+  performDeviceOperation(opCode);
+  poolManager.performHkOperation();
+  return returnvalue::OK;
+}
+
+ReturnValue_t FreshDeviceHandlerBase::performDeviceOperationPreQueueHandling(uint8_t opCode) {
+  return returnvalue::OK;
+}
+
+void FreshDeviceHandlerBase::startTransition(Mode_t mode_, Submode_t submode_) {
+  triggerEvent(CHANGING_MODE, mode_, submode_);
+  // Complete mode transition immediately by default.
+  setMode(mode_, submode_);
+}
+
+void FreshDeviceHandlerBase::setMode(Mode_t newMode, Submode_t newSubmode) {
+  mode = newMode;
+  submode = newSubmode;
+  modeHelper.modeChanged(mode, submode);
+  modeChanged(mode, submode);
+  announceMode(false);
+}
+
+void FreshDeviceHandlerBase::setMode(Mode_t newMode) { setMode(newMode, submode); }
+
+void FreshDeviceHandlerBase::getMode(Mode_t* mode_, Submode_t* submode_) {
+  *mode_ = this->mode;
+  *submode_ = this->submode;
+}
+
+void FreshDeviceHandlerBase::announceMode(bool recursive) {
+  triggerEvent(MODE_INFO, mode, submode);
+}
+
+void FreshDeviceHandlerBase::modeChanged(Mode_t mode_, Submode_t submode_) {}
+
+[[nodiscard]] MessageQueueId_t FreshDeviceHandlerBase::getCommandQueue() const {
+  return messageQueue->getId();
+}
+
+ReturnValue_t FreshDeviceHandlerBase::handleQueue() {
+  CommandMessage command;
+  ReturnValue_t result;
+  for (result = messageQueue->receiveMessage(&command); result == returnvalue::OK;
+       result = messageQueue->receiveMessage(&command)) {
+    result = actionHelper.handleActionMessage(&command);
+    if (result == returnvalue::OK) {
+      continue;
+    }
+
+    result = modeHelper.handleModeCommand(&command);
+    if (result == returnvalue::OK) {
+      continue;
+    }
+
+    result = healthHelper.handleHealthCommand(&command);
+    if (result == returnvalue::OK) {
+      continue;
+    }
+
+    result = paramHelper.handleParameterMessage(&command);
+    if (result == returnvalue::OK) {
+      continue;
+    }
+
+    result = poolManager.handleHousekeepingMessage(&command);
+    if (result == returnvalue::OK) {
+      continue;
+    }
+
+    result = handleCommandMessage(&command);
+    if (result == returnvalue::OK) {
+      continue;
+    }
+    command.setToUnknownCommand();
+    messageQueue->reply(&command);
+  }
+  return result;
+}
+
+HasHealthIF::HealthState FreshDeviceHandlerBase::getHealth() { return healthHelper.getHealth(); }
+
+const HasHealthIF* FreshDeviceHandlerBase::getOptHealthIF() const { return this; }
+
+const HasModesIF& FreshDeviceHandlerBase::getModeIF() const { return *this; }
+
+ModeTreeChildIF& FreshDeviceHandlerBase::getModeTreeChildIF() { return *this; }
+
+ReturnValue_t FreshDeviceHandlerBase::connectModeTreeParent(HasModeTreeChildrenIF& parent) {
+  return modetree::connectModeTreeParent(parent, *this, &healthHelper, modeHelper);
+}
+
+// Executable Overrides.
+void FreshDeviceHandlerBase::setTaskIF(PeriodicTaskIF* task_) { executingTask = task_; }
+
+// Pool Manager overrides.
+LocalDataPoolManager* FreshDeviceHandlerBase::getHkManagerHandle() { return &poolManager; }
+
+[[nodiscard]] uint32_t FreshDeviceHandlerBase::getPeriodicOperationFrequency() const {
+  return this->executingTask->getPeriodMs();
+}
+
+ReturnValue_t FreshDeviceHandlerBase::initializeAfterTaskCreation() {
+  return poolManager.initializeAfterTaskCreation();
+}
+
+ReturnValue_t FreshDeviceHandlerBase::setHealth(HasHealthIF::HealthState health) {
+  // Assembly should handle commanding to OFF.
+  healthHelper.setHealth(health);
+  return returnvalue::OK;
+}
+
+void FreshDeviceHandlerBase::triggerEvent(Event event, uint32_t parameter1, uint32_t parameter2) {
+  fdirInstance->triggerEvent(event, parameter1, parameter2);
+}
+
+void FreshDeviceHandlerBase::forwardEvent(Event event, uint32_t parameter1,
+                                          uint32_t parameter2) const {
+  fdirInstance->triggerEvent(event, parameter1, parameter2);
+}
+
+void FreshDeviceHandlerBase::setToExternalControl() { setHealth(HealthState::EXTERNAL_CONTROL); }
+
+// System Object overrides.
+ReturnValue_t FreshDeviceHandlerBase::initialize() {
+  ReturnValue_t result = modeHelper.initialize();
+  if (result != returnvalue::OK) {
+    return result;
+  }
+  result = healthHelper.initialize();
+  if (result != returnvalue::OK) {
+    return result;
+  }
+  result = actionHelper.initialize(messageQueue);
+  if (result != returnvalue::OK) {
+    return result;
+  }
+  result = paramHelper.initialize();
+  if (result != returnvalue::OK) {
+    return result;
+  }
+
+  result = poolManager.initialize(messageQueue);
+  if (result != returnvalue::OK) {
+    return result;
+  }
+  if (fdirInstance == nullptr) {
+    hasCustomFdir = false;
+    fdirInstance = new DeviceHandlerFailureIsolation(getObjectId(), defaultFdirParent);
+  }
+
+  result = fdirInstance->initialize();
+  if (result != returnvalue::OK) {
+    return result;
+  }
+  return SystemObject::initialize();
+}
+
+ReturnValue_t FreshDeviceHandlerBase::getParameter(uint8_t domainId, uint8_t uniqueId,
+                                                   ParameterWrapper* parameterWrapper,
+                                                   const ParameterWrapper* newValues,
+                                                   uint16_t startAtIndex) {
+  ReturnValue_t result =
+      fdirInstance->getParameter(domainId, uniqueId, parameterWrapper, newValues, startAtIndex);
+  if (result != INVALID_DOMAIN_ID) {
+    return result;
+  }
+  return INVALID_DOMAIN_ID;
+}

src/fsfw/devicehandlers/FreshDeviceHandlerBase.h

@@ -0,0 +1,167 @@
+#pragma once
+
+#include "fsfw/action.h"
+#include "fsfw/datapoollocal/HasLocalDataPoolIF.h"
+#include "fsfw/datapoollocal/LocalDataPoolManager.h"
+#include "fsfw/devicehandlers/DeviceHandlerIF.h"
+#include "fsfw/fdir/FailureIsolationBase.h"
+#include "fsfw/health/HasHealthIF.h"
+#include "fsfw/health/HealthHelper.h"
+#include "fsfw/modes/HasModesIF.h"
+#include "fsfw/objectmanager.h"
+#include "fsfw/parameters/ParameterHelper.h"
+#include "fsfw/parameters/ReceivesParameterMessagesIF.h"
+#include "fsfw/retval.h"
+#include "fsfw/subsystem/ModeTreeChildIF.h"
+#include "fsfw/subsystem/ModeTreeConnectionIF.h"
+#include "fsfw/tasks/ExecutableObjectIF.h"
+#include "fsfw/tasks/PeriodicTaskIF.h"
+
+struct DhbConfig {
+  explicit DhbConfig(object_id_t objectId) : objectId(objectId) {}
+  object_id_t objectId;
+  FailureIsolationBase* fdirInstance = nullptr;
+  object_id_t defaultFdirParent = objects::NO_OBJECT;
+  uint32_t msgQueueDepth = 10;
+};
+
+class FreshDeviceHandlerBase : public SystemObject,
+                               public DeviceHandlerIF,
+                               public HasModesIF,
+                               public HasHealthIF,
+                               public ExecutableObjectIF,
+                               public ModeTreeChildIF,
+                               public ModeTreeConnectionIF,
+                               public HasActionsIF,
+                               public ReceivesParameterMessagesIF,
+                               public HasLocalDataPoolIF {
+ public:
+  explicit FreshDeviceHandlerBase(DhbConfig config);
+  ~FreshDeviceHandlerBase() override;
+
+  /**
+   * Periodic helper executed function, implemented by child class.
+   */
+  virtual void performDeviceOperation(uint8_t opCode) = 0;
+
+  [[nodiscard]] object_id_t getObjectId() const override;
+
+  [[nodiscard]] MessageQueueId_t getCommandQueue() const override;
+
+  HasHealthIF::HealthState getHealth() override;
+
+  // Mode Tree Overrides.
+  [[nodiscard]] const HasHealthIF* getOptHealthIF() const override;
+  [[nodiscard]] const HasModesIF& getModeIF() const override;
+  ReturnValue_t connectModeTreeParent(HasModeTreeChildrenIF& parent) override;
+  ModeTreeChildIF& getModeTreeChildIF() override;
+
+  [[nodiscard]] uint32_t getPeriodicOperationFrequency() const override;
+
+ protected:
+  // Pool Manager overrides.
+  LocalDataPoolManager* getHkManagerHandle() override;
+  ActionHelper actionHelper;
+  ModeHelper modeHelper;
+  HealthHelper healthHelper;
+  ParameterHelper paramHelper;
+  LocalDataPoolManager poolManager;
+
+  bool hasCustomFdir = false;
+  FailureIsolationBase* fdirInstance;
+  object_id_t defaultFdirParent;
+
+  /**
+   * Pointer to the task which executes this component,
+   * is invalid before setTaskIF was called.
+   */
+  PeriodicTaskIF* executingTask = nullptr;
+
+  Mode_t mode = HasModesIF::MODE_UNDEFINED;
+  Submode_t submode = 0;
+
+  MessageQueueIF* messageQueue;
+
+  /**
+   * The default queue handler will process all messages for the interfaces implemented
+   * by this class. If there are special requirements, for example that action commands are
+   * received on a different queue, the user can override this function for those special
+   * requirements.
+   */
+  virtual ReturnValue_t handleQueue();
+
+  // Mode Helpers.
+  virtual void modeChanged(Mode_t mode, Submode_t submode);
+  /**
+   * The default implementation sets the new mode immediately. If this is not applicable for
+   * certain modes, the user should provide a custom implementation, which performs rougly
+   * the same functionality of this function, when all the steps have been taken to reach the
+   * new mode.
+   */
+  void startTransition(Mode_t mode, Submode_t submode) override;
+  virtual void setMode(Mode_t newMode, Submode_t newSubmode);
+  virtual void setMode(Mode_t newMode);
+  void getMode(Mode_t* mode, Submode_t* submode) override;
+  void setToExternalControl() override;
+  void announceMode(bool recursive) override;
+  // System Object overrides.
+  ReturnValue_t initialize() override;
+
+  /**
+   * Implemented by child class. Handle all command messages which are
+   * not health, mode, action or housekeeping messages.
+   * @param message
+   * @return
+   */
+  virtual ReturnValue_t handleCommandMessage(CommandMessage* message) = 0;
+
+  // HK manager abstract functions.
+  LocalPoolDataSetBase* getDataSetHandle(sid_t sid) override = 0;
+  ReturnValue_t initializeLocalDataPool(localpool::DataPool& localDataPoolMap,
+                                        LocalDataPoolManager& poolManager) override = 0;
+
+  // Mode abstract functions
+  ReturnValue_t checkModeCommand(Mode_t mode, Submode_t submode,
+                                 uint32_t* msToReachTheMode) override = 0;
+  // Health Overrides.
+  ReturnValue_t setHealth(HealthState health) override;
+  // Action override. Forward to user.
+  ReturnValue_t executeAction(ActionId_t actionId, MessageQueueId_t commandedBy,
+                              const uint8_t* data, size_t size) override = 0;
+  // Executable overrides.
+  ReturnValue_t performOperation(uint8_t opCode) override;
+  ReturnValue_t initializeAfterTaskCreation() override;
+
+  /**
+   * This calls the FDIR instance event trigger function.
+   * @param event
+   * @param parameter1
+   * @param parameter2
+   */
+  void triggerEvent(Event event, uint32_t parameter1 = 0, uint32_t parameter2 = 0) override;
+  /**
+   * This calls the FDIR instance event forward function.
+   * @param event
+   * @param parameter1
+   * @param parameter2
+   */
+  void forwardEvent(Event event, uint32_t parameter1, uint32_t parameter2) const override;
+  /**
+   * This implementation handles the FDIR parameters. The user can override this to handle
+   * custom parameters.
+   * @param domainId
+   * @param uniqueId
+   * @param parameterWrapper
+   * @param newValues
+   * @param startAtIndex
+   * @return
+   */
+  ReturnValue_t getParameter(uint8_t domainId, uint8_t uniqueId, ParameterWrapper* parameterWrapper,
+                             const ParameterWrapper* newValues, uint16_t startAtIndex) override;
+
+  virtual ReturnValue_t performDeviceOperationPreQueueHandling(uint8_t opCode);
+
+ private:
+  // Executable Overrides.
+  void setTaskIF(PeriodicTaskIF* task) override;
+};

src/fsfw/filesystem/HasFileSystemIF.h

@@ -17,7 +17,7 @@ struct FilesystemParams {
 };
 
 struct FileOpParams {
-  FileOpParams(const char* path, size_t size) : fsParams(path), size(size) {}
+  FileOpParams(const char* path, size_t opSize) : fsParams(path), size(opSize) {}
 
   [[nodiscard]] const char* path() const { return fsParams.path; }
 
@@ -80,6 +80,8 @@ class HasFileSystemIF {
 
   virtual bool isDirectory(const char* path) = 0;
 
+  virtual bool getFileSize(FilesystemParams params, uint64_t& fileSize) = 0;
+
   virtual bool fileExists(FilesystemParams params) = 0;
 
   /**

src/fsfw/globalfunctions/math/QuaternionOperations.cpp

@@ -39,6 +39,39 @@ void QuaternionOperations::inverse(const double* quaternion, double* inverseQuat
   VectorOperations<double>::mulScalar(inverseQuaternion, -1, inverseQuaternion, 3);
 }
 
+void QuaternionOperations::slerp(const double q1[4], const double q2[4], const double weight,
+                                 double q[4]) {
+  double q1s[4] = {0, 0, 0, 0}, q2I[4] = {0, 0, 0, 0}, qD[4] = {0, 0, 0, 0}, left[4] = {0, 0, 0, 0},
+         right[4] = {0, 0, 0, 0}, angle = 0;
+
+  // we need to be able to invert this quaternion
+  std::memcpy(q1s, q1, 4 * sizeof(double));
+  // calculate angle between orientations
+  inverse(q2, q2I);
+  multiply(q1s, q2I, qD);
+  angle = std::acos(qD[3]);
+
+  if (std::cos(angle) < 0.0) {
+    // we need to invert one quaternion
+    VectorOperations<double>::mulScalar(q1s, -1, q1s, 4);
+    multiply(q1s, q2I, qD);
+    angle = std::acos(qD[3]);
+  }
+
+  if (std::sin(angle) == 0.0) {
+    // nothing to calculate here
+    std::memcpy(q, q1s, 4 * sizeof(double));
+    return;
+  }
+
+  VectorOperations<double>::mulScalar(q1s, std::sin((1 - weight) * angle) / std::sin(angle), left,
+                                      4);
+  VectorOperations<double>::mulScalar(q2, std::sin(weight * angle) / std::sin(angle), right, 4);
+  VectorOperations<double>::add(left, right, q, 4);
+
+  normalize(q);
+}
+
 QuaternionOperations::QuaternionOperations() {}
 
 void QuaternionOperations::normalize(const double* quaternion, double* unitQuaternion) {

src/fsfw/globalfunctions/math/QuaternionOperations.h

@@ -23,6 +23,8 @@ class QuaternionOperations {
 
   static void inverse(const double *quaternion, double *inverseQuaternion);
 
+  static void slerp(const double q1[4], const double q2[4], const double weight, double q[4]);
+
   /**
    * returns angle in ]-Pi;Pi] or [0;Pi] if abs == true
    */

src/fsfw/objectmanager/ObjectManager.cpp

@@ -118,8 +118,8 @@ void ObjectManager::initialize() {
                  << result << std::dec << std::setfill(' ') << std::endl;
 #else
       sif::printError(
-          "ObjectManager::initialize: Object 0x%08x failed to initialize with code 0x%04x\n", var,
+          "ObjectManager::initialize: Object 0x%08x failed to initialize with code 0x%04x\n",
-          result);
+          it.first, result);
 #endif
       errorCount++;
     }

src/fsfw/osal/common/TcpTmTcBridge.cpp

@@ -21,7 +21,7 @@ TcpTmTcBridge::TcpTmTcBridge(object_id_t objectId, object_id_t tcDestination,
     : TmTcBridge("TCP TMTC Bridge", objectId, tcDestination, msgQueueDepth, tmStoreId, tcStoreId) {
   mutex = MutexFactory::instance()->createMutex();
   // Connection is always up, TM is requested by connecting to server and receiving packets
-  registerCommConnect();
+  TmTcBridge::registerCommConnect();
 }
 
 ReturnValue_t TcpTmTcBridge::initialize() {

src/fsfw/osal/common/TcpTmTcServer.h

@@ -123,6 +123,7 @@ class TcpTmTcServer : public SystemObject, public TcpIpBase, public ExecutableOb
   StorageManagerIF* tmStore = nullptr;
 
  private:
+  //! [EXPORT] : [SKIP]
   static constexpr ReturnValue_t CONN_BROKEN = returnvalue::makeCode(1, 0);
   //! TMTC bridge is cached.
   object_id_t tmtcBridgeId = objects::NO_OBJECT;

src/fsfw/power/PowerSwitcherComponent.h

@@ -38,6 +38,8 @@ class PowerSwitcherComponent : public SystemObject,
 
  protected:
   PowerSwitcher switcher;
+  ReturnValue_t checkModeCommand(Mode_t mode, Submode_t submode,
+                                 uint32_t *msToReachTheMode) override;
 
  private:
   MessageQueueIF *queue = nullptr;
@@ -56,8 +58,6 @@ class PowerSwitcherComponent : public SystemObject,
 
   [[nodiscard]] MessageQueueId_t getCommandQueue() const override;
   void getMode(Mode_t *mode, Submode_t *submode) override;
-  ReturnValue_t checkModeCommand(Mode_t mode, Submode_t submode,
-                                 uint32_t *msToReachTheMode) override;
   void startTransition(Mode_t mode, Submode_t submode) override;
   virtual void performFaultyOperation();
   void setToExternalControl() override;

src/fsfw/pus/Service11TelecommandScheduling.h

@@ -43,6 +43,7 @@ class Service11TelecommandScheduling final : public PusServiceBase {
   static constexpr ReturnValue_t INVALID_RELATIVE_TIME = returnvalue::makeCode(CLASS_ID, 4);
   static constexpr ReturnValue_t CONTAINED_TC_TOO_SMALL = returnvalue::makeCode(CLASS_ID, 5);
   static constexpr ReturnValue_t CONTAINED_TC_CRC_MISSMATCH = returnvalue::makeCode(CLASS_ID, 6);
+  static constexpr ReturnValue_t MAP_IS_FULL = returnvalue::makeCode(CLASS_ID, 7);
 
   static constexpr uint8_t SUBSYSTEM_ID = SUBSYSTEM_ID::PUS_SERVICE_11;
 

src/fsfw/pus/Service11TelecommandScheduling.tpp

@@ -150,6 +150,9 @@ inline ReturnValue_t Service11TelecommandScheduling<MAX_NUM_TCS>::handleResetCom
 template <size_t MAX_NUM_TCS>
 inline ReturnValue_t Service11TelecommandScheduling<MAX_NUM_TCS>::doInsertActivity(
     const uint8_t *data, size_t size) {
+  if(telecommandMap.full()) {
+    return MAP_IS_FULL;
+  }
   uint32_t timestamp = 0;
   ReturnValue_t result = SerializeAdapter::deSerialize(&timestamp, &data, &size, DEF_END);
   if (result != returnvalue::OK) {

src/fsfw/returnvalues/FwClassIds.h

@@ -61,7 +61,8 @@ enum : uint8_t {
   HAS_ACTIONS_IF,                 // HF
   DEVICE_COMMUNICATION_IF,        // DC
   BSP,                            // BSP
-  CFDP,                           // CFDP
+  CFDP_BASE,                      // CFDP
+  CFDP_HANDLER,                   // CFDP
   TIME_STAMPER_IF,                // TSI
   SGP4PROPAGATOR_CLASS,           // SGP4
   MUTEX_IF,                       // MUX

src/fsfw/serialize/SerialBufferAdapter.cpp

@@ -107,14 +107,6 @@ uint8_t* SerialBufferAdapter<count_t>::getBuffer() {
 
 template <typename count_t>
 const uint8_t* SerialBufferAdapter<count_t>::getConstBuffer() const {
-  if (constBuffer == nullptr) {
-#if FSFW_CPP_OSTREAM_ENABLED == 1
-    sif::error << "SerialBufferAdapter::getConstBuffer:"
-                  " Buffers are unitialized!"
-               << std::endl;
-#endif
-    return nullptr;
-  }
   return constBuffer;
 }
 

src/fsfw/serialize/SerialBufferAdapter.h

@@ -63,7 +63,17 @@ class SerialBufferAdapter : public SerializeIF {
   ReturnValue_t deSerialize(const uint8_t** buffer, size_t* size,
                             Endianness streamEndianness) override;
 
+  /**
+   * Please note that this function can also return a nullpointer in case the length field contains
+   * 0.
+   * @return
+   */
   uint8_t* getBuffer();
+  /**
+   * Please note that this function can also return a nullpointer in case the length field contains
+   * 0.
+   * @return
+   */
   [[nodiscard]] const uint8_t* getConstBuffer() const;
   void setConstBuffer(const uint8_t* buf, count_t bufLen);
 

src/fsfw/storagemanager/LocalPool.cpp

@@ -89,7 +89,7 @@ ReturnValue_t LocalPool::deleteData(store_address_t storeId) {
   ReturnValue_t status = returnvalue::OK;
   size_type pageSize = getSubpoolElementSize(storeId.poolIndex);
   if ((pageSize != 0) and (storeId.packetIndex < numberOfElements[storeId.poolIndex])) {
-    uint16_t packetPosition = getRawPosition(storeId);
+    size_type packetPosition = getRawPosition(storeId);
     uint8_t* ptr = &store[storeId.poolIndex][packetPosition];
     std::memset(ptr, 0, pageSize);
     // Set free list

src/fsfw/tmtcservices/TmTcBridge.cpp

@@ -23,18 +23,8 @@ TmTcBridge::TmTcBridge(const char* name, object_id_t objectId, object_id_t tcDes
 
 TmTcBridge::~TmTcBridge() { QueueFactory::instance()->deleteMessageQueue(tmTcReceptionQueue); }
 
-ReturnValue_t TmTcBridge::setNumberOfSentPacketsPerCycle(uint8_t sentPacketsPerCycle) {
+void TmTcBridge::setNumberOfSentPacketsPerCycle(uint32_t sentPacketsPerCycle_) {
-  if (sentPacketsPerCycle <= LIMIT_STORED_DATA_SENT_PER_CYCLE) {
+  this->sentPacketsPerCycle = sentPacketsPerCycle_;
-    this->sentPacketsPerCycle = sentPacketsPerCycle;
-    return returnvalue::OK;
-  } else {
-#if FSFW_CPP_OSTREAM_ENABLED == 1
-    sif::warning << "TmTcBridge::setNumberOfSentPacketsPerCycle: Number of "
-                 << "packets sent per cycle exceeds limits. "
-                 << "Keeping default value." << std::endl;
-#endif
-    return returnvalue::FAILED;
-  }
 }
 
 ReturnValue_t TmTcBridge::setMaxNumberOfPacketsStored(unsigned int maxNumberOfPacketsStored) {
@@ -144,7 +134,7 @@ ReturnValue_t TmTcBridge::handleTmQueue() {
 #endif
 #endif /* FSFW_VERBOSE_LEVEL >= 3 */
 
-    if (communicationLinkUp == false or packetSentCounter >= sentPacketsPerCycle) {
+    if (!communicationLinkUp or packetSentCounter >= sentPacketsPerCycle) {
       result = storeDownlinkData(&message);
       if (result != returnvalue::OK) {
         tmStore->deleteData(message.getStorageId());

src/fsfw/tmtcservices/TmTcBridge.h

@@ -15,10 +15,9 @@ class TmTcBridge : public AcceptsTelemetryIF,
                    public ExecutableObjectIF,
                    public SystemObject {
  public:
-  static constexpr uint8_t LIMIT_STORED_DATA_SENT_PER_CYCLE = 15;
   static constexpr unsigned int LIMIT_DOWNLINK_PACKETS_STORED = 500;
 
-  static constexpr uint8_t DEFAULT_STORED_DATA_SENT_PER_CYCLE = 5;
+  static constexpr uint8_t DEFAULT_STORED_DATA_SENT_PER_CYCLE = 20;
   static constexpr uint8_t DEFAULT_DOWNLINK_PACKETS_STORED = 10;
 
   TmTcBridge(const char* name, object_id_t objectId, object_id_t tcDestination,
@@ -32,7 +31,7 @@ class TmTcBridge : public AcceptsTelemetryIF,
    * @return -@c returnvalue::OK if value was set successfully
    *         -@c returnvalue::FAILED otherwise, stored value stays the same
    */
-  ReturnValue_t setNumberOfSentPacketsPerCycle(uint8_t sentPacketsPerCycle);
+  void setNumberOfSentPacketsPerCycle(uint32_t sentPacketsPerCycle);
 
   /**
    * Set number of packets sent per performOperation().Please note that this
@@ -151,7 +150,7 @@ class TmTcBridge : public AcceptsTelemetryIF,
    * This FIFO can be used to store downlink data which can not be sent at the moment.
    */
   DynamicFIFO<store_address_t>* tmFifo = nullptr;
-  uint8_t sentPacketsPerCycle = DEFAULT_STORED_DATA_SENT_PER_CYCLE;
+  uint32_t sentPacketsPerCycle = DEFAULT_STORED_DATA_SENT_PER_CYCLE;
   unsigned int maxNumberOfPacketsStored = DEFAULT_DOWNLINK_PACKETS_STORED;
 };
 

src/fsfw/util/CMakeLists.txt

@@ -0,0 +1 @@
+target_sources(${LIB_FSFW_NAME} PRIVATE)

src/fsfw/util/ProvidesSeqCountIF.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <cstdint>
+
+class ProvidesSeqCountIF {
+ public:
+  virtual ~ProvidesSeqCountIF() = default;
+
+  [[nodiscard]] virtual unsigned int bitWidth() const = 0;
+
+  virtual uint64_t get() = 0;
+  virtual void increment() = 0;
+
+  virtual uint64_t getAndIncrement() {
+    uint64_t val = get();
+    increment();
+    return val;
+  }
+};

src/fsfw/util/SeqCountProvider.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <type_traits>
+
+#include "ProvidesSeqCountIF.h"
+
+template <typename T>
+class SeqCountProvider : public ProvidesSeqCountIF {
+  static_assert(std::is_same<T, uint8_t>::value || std::is_same<T, uint16_t>::value ||
+                    std::is_same<T, uint32_t>::value,
+                "Only uint8_t, uint16_t, and uint32_t are allowed.");
+
+ public:
+  [[nodiscard]] unsigned int bitWidth() const override { return sizeof(T) * 8; }
+  uint64_t get() override { return counter; }
+  // I'm also abusing the primitive C variable overflow wrap around here.
+  void increment() override { counter++; }
+
+ private:
+  T counter{};
+};
+
+using SeqCountProviderU8 = SeqCountProvider<uint8_t>;
+using SeqCountProviderU16 = SeqCountProvider<uint16_t>;
+using SeqCountProviderU32 = SeqCountProvider<uint32_t>;

src/fsfw_hal/host/HostFilesystem.cpp

@@ -184,3 +184,11 @@ ReturnValue_t HostFilesystem::getBaseFilename(FilesystemParams params, char *nam
   baseNameLen = baseName.size();
   return returnvalue::OK;
 }
+
+bool HostFilesystem::getFileSize(FilesystemParams params, uint64_t &fileSize) {
+  if (!fileExists(params)) {
+    return false;
+  }
+  fileSize = std::filesystem::file_size(params.path);
+  return true;
+}

src/fsfw_hal/host/HostFilesystem.h

@@ -11,6 +11,7 @@ class HostFilesystem : public HasFileSystemIF {
 
   ReturnValue_t getBaseFilename(FilesystemParams params, char *nameBuf, size_t maxLen,
                                 size_t &baseNameLen) override;
+  virtual bool getFileSize(FilesystemParams params, uint64_t &fileSize) override;
   bool isDirectory(const char *path) override;
   bool fileExists(FilesystemParams params) override;
   ReturnValue_t truncateFile(FilesystemParams params) override;

src/fsfw_hal/stm32h7/spi/SpiComIF.cpp

@@ -282,7 +282,7 @@ ReturnValue_t SpiComIF::handlePollingSendOperation(uint8_t *recvPtr, SPI_HandleT
 #endif
 #endif
       spiCookie.setTransferState(spi::TransferStates::FAILURE);
-      return spi::HAL_TIMEOUT_RETVAL;
+      return spi::TIMEOUT;
     }
     case (HAL_ERROR):
     default: {
@@ -296,7 +296,7 @@ ReturnValue_t SpiComIF::handlePollingSendOperation(uint8_t *recvPtr, SPI_HandleT
 #endif
 #endif
       spiCookie.setTransferState(spi::TransferStates::FAILURE);
-      return spi::HAL_ERROR_RETVAL;
+      return spi::GENERIC_ERROR;
     }
   }
   return returnvalue::OK;

src/fsfw_hal/stm32h7/spi/spiDefinitions.h

@@ -9,11 +9,6 @@
 
 namespace spi {
 
-static constexpr uint8_t HAL_SPI_ID = CLASS_ID::HAL_SPI;
-static constexpr ReturnValue_t HAL_TIMEOUT_RETVAL = returnvalue::makeCode(HAL_SPI_ID, 0);
-static constexpr ReturnValue_t HAL_BUSY_RETVAL = returnvalue::makeCode(HAL_SPI_ID, 1);
-static constexpr ReturnValue_t HAL_ERROR_RETVAL = returnvalue::makeCode(HAL_SPI_ID, 2);
-
 enum class TransferStates { IDLE, WAIT, SUCCESS, FAILURE };
 
 enum SpiBus { SPI_1, SPI_2 };

unittests/CatchFactory.cpp

@@ -32,7 +32,7 @@ void Factory::produceFrameworkObjects(void* args) {
   setStaticFrameworkObjectIds();
   new EventManager(objects::EVENT_MANAGER, 80);
   new HealthTable(objects::HEALTH_TABLE);
-  new InternalErrorReporter(objects::INTERNAL_ERROR_REPORTER, 20, false, 1.0);
+  new InternalErrorReporter(objects::INTERNAL_ERROR_REPORTER, 20, false, 5.0);
 
   {
     PoolManager::LocalPoolConfig poolCfg = {{100, 16}, {50, 32}, {25, 64}, {15, 128}, {5, 1024}};

unittests/action/TestActionHelper.cpp

@@ -57,7 +57,7 @@ TEST_CASE("Action Helper", "[action]") {
     step += 1;
     CHECK(testMqMock.wasMessageSent());
     CommandMessage testMessage;
-    REQUIRE(testMqMock.getNextSentMessage(testMessage) == returnvalue::OK);
+    REQUIRE(testMqMock.getNextSentMessageToDefaultDest(testMessage) == returnvalue::OK);
     REQUIRE(testMessage.getCommand() == static_cast<uint32_t>(ActionMessage::STEP_FAILED));
     REQUIRE(testMessage.getParameter() == static_cast<uint32_t>(testActionId));
     uint32_t parameter2 = ((uint32_t)step << 16) | (uint32_t)status;
@@ -71,7 +71,7 @@ TEST_CASE("Action Helper", "[action]") {
     actionHelper.finish(false, testMqMock.getId(), testActionId, status);
     CHECK(testMqMock.wasMessageSent());
     CommandMessage testMessage;
-    REQUIRE(testMqMock.getNextSentMessage(testMessage) == returnvalue::OK);
+    REQUIRE(testMqMock.getNextSentMessageToDefaultDest(testMessage) == returnvalue::OK);
     REQUIRE(testMessage.getCommand() == static_cast<uint32_t>(ActionMessage::COMPLETION_FAILED));
     REQUIRE(ActionMessage::getActionId(&testMessage) == testActionId);
     REQUIRE(ActionMessage::getReturnCode(&testMessage) == static_cast<uint32_t>(status));
@@ -87,7 +87,7 @@ TEST_CASE("Action Helper", "[action]") {
     REQUIRE(ipcStore->getData(toLongParamAddress).first ==
             static_cast<uint32_t>(StorageManagerIF::DATA_DOES_NOT_EXIST));
     CommandMessage testMessage;
-    REQUIRE(testMqMock.getNextSentMessage(testMessage) == returnvalue::OK);
+    REQUIRE(testMqMock.getNextSentMessageToDefaultDest(testMessage) == returnvalue::OK);
     REQUIRE(testMessage.getCommand() == static_cast<uint32_t>(ActionMessage::STEP_FAILED));
     REQUIRE(ActionMessage::getReturnCode(&testMessage) == 0xAFFE);
     REQUIRE(ActionMessage::getStep(&testMessage) == 0);

unittests/cfdp/CMakeLists.txt

@@ -1,5 +1,6 @@
-target_sources(${FSFW_TEST_TGT} PRIVATE testCfdp.cpp testOtherTlvs.cpp
+target_sources(
-                                        testTlv.cpp testLvs.cpp)
+  ${FSFW_TEST_TGT} PRIVATE testCfdp.cpp testOtherTlvs.cpp
+                           testReservedMsgCreator.cpp testTlv.cpp testLvs.cpp)
 
 add_subdirectory(handler)
 add_subdirectory(pdu)

unittests/cfdp/handler/CMakeLists.txt

@@ -1,3 +1,4 @@
 target_sources(
-  ${FSFW_TEST_TGT} PRIVATE testDistributor.cpp testDestHandler.cpp
+  ${FSFW_TEST_TGT}
-                           testSourceHandler.cpp testFaultHandler.cpp)
+  PRIVATE testDistributor.cpp testDestHandler.cpp testReservedMsgParser.cpp
+          testPutRequest.cpp testSourceHandler.cpp testFaultHandler.cpp)

unittests/cfdp/handler/testDestHandler.cpp

@@ -50,18 +50,18 @@ TEST_CASE("CFDP Dest Handler", "[cfdp]") {
   auto destHandler = DestHandler(dp, fp);
   CHECK(destHandler.initialize() == OK);
 
-  auto metadataPreparation = [&](FileSize cfdpFileSize, ChecksumType checksumType) {
+  auto metadataPreparation = [&](Fss cfdpFileSize, ChecksumType checksumType) {
     std::string srcNameString = "hello.txt";
     std::string destNameString = "hello-cpy.txt";
     StringLv srcName(srcNameString);
     StringLv destName(destNameString);
-    MetadataInfo info(false, checksumType, cfdpFileSize, srcName, destName);
+    MetadataGenericInfo info(false, checksumType, std::move(cfdpFileSize));
     TransactionSeqNum seqNum(UnsignedByteField<uint16_t>(1));
     conf.sourceId = remoteId;
     conf.destId = localId;
     conf.mode = TransmissionMode::UNACKNOWLEDGED;
     conf.seqNum = seqNum;
-    MetadataPduCreator metadataCreator(conf, info);
+    MetadataPduCreator metadataCreator(conf, info, srcName, destName, nullptr, 0);
     REQUIRE(tcStore.getFreeElement(&storeId, metadataCreator.getSerializedSize(), &buf) == OK);
     REQUIRE(metadataCreator.serialize(buf, serLen, metadataCreator.getSerializedSize()) == OK);
     PacketInfo packetInfo(metadataCreator.getPduType(), storeId,
@@ -81,17 +81,17 @@ TEST_CASE("CFDP Dest Handler", "[cfdp]") {
     auto& idMetadataPair = userMock.metadataRecvd.back();
     REQUIRE(idMetadataPair.first == destHandler.getTransactionId());
     REQUIRE(idMetadataPair.second.sourceId.getValue() == 3);
-    REQUIRE(idMetadataPair.second.fileSize == fileLen);
+    REQUIRE(idMetadataPair.second.fileSize.getSize(nullptr) == fileLen);
     REQUIRE(strcmp(idMetadataPair.second.destFileName, destName) == 0);
     REQUIRE(strcmp(idMetadataPair.second.sourceFileName, sourceName) == 0);
     userMock.metadataRecvd.pop();
     REQUIRE(fsMock.fileMap.find(destName) != fsMock.fileMap.end());
     REQUIRE(res.result == OK);
-    REQUIRE(res.state == CfdpStates::BUSY_CLASS_1_NACKED);
+    REQUIRE(res.state == CfdpState::BUSY_CLASS_1_NACKED);
     REQUIRE(res.step == DestHandler::TransactionStep::RECEIVING_FILE_DATA_PDUS);
   };
 
-  auto eofPreparation = [&](FileSize cfdpFileSize, uint32_t crc) {
+  auto eofPreparation = [&](Fss cfdpFileSize, uint32_t crc) {
     EofInfo eofInfo(cfdp::ConditionCode::NO_ERROR, crc, std::move(cfdpFileSize));
     EofPduCreator eofCreator(conf, eofInfo);
     REQUIRE(tcStore.getFreeElement(&storeId, eofCreator.getSerializedSize(), &buf) == OK);
@@ -102,14 +102,14 @@ TEST_CASE("CFDP Dest Handler", "[cfdp]") {
 
   auto eofCheck = [&](const cfdp::DestHandler::FsmResult& res, const TransactionId& id) {
     REQUIRE(res.result == OK);
-    REQUIRE(res.state == CfdpStates::IDLE);
+    REQUIRE(res.state == CfdpState::IDLE);
     REQUIRE(res.errors == 0);
     REQUIRE(res.step == DestHandler::TransactionStep::IDLE);
     // Assert that the packet was deleted after handling
     REQUIRE(not tcStore.hasDataAtId(storeId));
     REQUIRE(packetInfoList.empty());
-    REQUIRE(userMock.eofsRevd.size() == 1);
+    REQUIRE(userMock.eofRecvdRecvd.size() == 1);
-    auto& eofId = userMock.eofsRevd.back();
+    auto& eofId = userMock.eofRecvdRecvd.back();
     CHECK(eofId == id);
     REQUIRE(userMock.finishedRecvd.size() == 1);
     auto& idParamPair = userMock.finishedRecvd.back();
@@ -120,7 +120,7 @@ TEST_CASE("CFDP Dest Handler", "[cfdp]") {
   auto fileDataPduCheck = [&](const cfdp::DestHandler::FsmResult& res,
                               const std::vector<store_address_t>& idsToCheck) {
     REQUIRE(res.result == OK);
-    REQUIRE(res.state == CfdpStates::BUSY_CLASS_1_NACKED);
+    REQUIRE(res.state == CfdpState::BUSY_CLASS_1_NACKED);
     REQUIRE(res.step == DestHandler::TransactionStep::RECEIVING_FILE_DATA_PDUS);
     for (const auto id : idsToCheck) {
       REQUIRE(not tcStore.hasDataAtId(id));
@@ -129,50 +129,50 @@ TEST_CASE("CFDP Dest Handler", "[cfdp]") {
   };
 
   SECTION("State") {
-    CHECK(destHandler.getCfdpState() == CfdpStates::IDLE);
+    CHECK(destHandler.getCfdpState() == CfdpState::IDLE);
     CHECK(destHandler.getTransactionStep() == DestHandler::TransactionStep::IDLE);
   }
 
   SECTION("Idle State Machine Iteration") {
-    auto res = destHandler.performStateMachine();
+    auto res = destHandler.stateMachine();
     CHECK(res.result == OK);
     CHECK(res.callStatus == CallStatus::CALL_AFTER_DELAY);
     CHECK(res.errors == 0);
-    CHECK(destHandler.getCfdpState() == CfdpStates::IDLE);
+    CHECK(destHandler.getCfdpState() == CfdpState::IDLE);
     CHECK(destHandler.getTransactionStep() == DestHandler::TransactionStep::IDLE);
   }
 
   SECTION("Empty File Transfer") {
-    const DestHandler::FsmResult& res = destHandler.performStateMachine();
+    const DestHandler::FsmResult& res = destHandler.stateMachine();
     CHECK(res.result == OK);
-    FileSize cfdpFileSize(0);
+    Fss cfdpFileSize(0);
     metadataPreparation(cfdpFileSize, ChecksumType::NULL_CHECKSUM);
-    destHandler.performStateMachine();
+    destHandler.stateMachine();
     metadataCheck(res, "hello.txt", "hello-cpy.txt", 0);
-    destHandler.performStateMachine();
+    destHandler.stateMachine();
     REQUIRE(res.callStatus == CallStatus::CALL_AFTER_DELAY);
     auto transactionId = destHandler.getTransactionId();
     eofPreparation(cfdpFileSize, 0);
     // After EOF, operation is done because no closure was requested
-    destHandler.performStateMachine();
+    destHandler.stateMachine();
     eofCheck(res, transactionId);
   }
 
   SECTION("Small File Transfer") {
-    const DestHandler::FsmResult& res = destHandler.performStateMachine();
+    const DestHandler::FsmResult& res = destHandler.stateMachine();
     CHECK(res.result == OK);
     std::string fileData = "hello test data";
     etl::crc32 crcCalc;
     crcCalc.add(fileData.begin(), fileData.end());
     uint32_t crc32 = crcCalc.value();
-    FileSize cfdpFileSize(fileData.size());
+    Fss cfdpFileSize(fileData.size());
     metadataPreparation(cfdpFileSize, ChecksumType::CRC_32);
-    destHandler.performStateMachine();
+    destHandler.stateMachine();
     metadataCheck(res, "hello.txt", "hello-cpy.txt", fileData.size());
-    destHandler.performStateMachine();
+    destHandler.stateMachine();
     REQUIRE(res.callStatus == CallStatus::CALL_AFTER_DELAY);
     auto transactionId = destHandler.getTransactionId();
-    FileSize offset(0);
+    Fss offset(0);
     FileDataInfo fdPduInfo(offset, reinterpret_cast<const uint8_t*>(fileData.data()),
                            fileData.size());
     FileDataCreator fdPduCreator(conf, fdPduInfo);
@@ -180,16 +180,16 @@ TEST_CASE("CFDP Dest Handler", "[cfdp]") {
     REQUIRE(fdPduCreator.serialize(buf, serLen, fdPduCreator.getSerializedSize()) == OK);
     PacketInfo packetInfo(fdPduCreator.getPduType(), storeId, std::nullopt);
     packetInfoList.push_back(packetInfo);
-    destHandler.performStateMachine();
+    destHandler.stateMachine();
     fileDataPduCheck(res, {storeId});
     eofPreparation(cfdpFileSize, crc32);
     // After EOF, operation is done because no closure was requested
-    destHandler.performStateMachine();
+    destHandler.stateMachine();
     eofCheck(res, transactionId);
   }
 
   SECTION("Segmented File Transfer") {
-    const DestHandler::FsmResult& res = destHandler.performStateMachine();
+    const DestHandler::FsmResult& res = destHandler.stateMachine();
     CHECK(res.result == OK);
     std::random_device dev;
     std::mt19937 rng(dev());
@@ -201,17 +201,17 @@ TEST_CASE("CFDP Dest Handler", "[cfdp]") {
     etl::crc32 crcCalc;
     crcCalc.add(largerFileData.begin(), largerFileData.end());
     uint32_t crc32 = crcCalc.value();
-    FileSize cfdpFileSize(largerFileData.size());
+    Fss cfdpFileSize(largerFileData.size());
     metadataPreparation(cfdpFileSize, ChecksumType::CRC_32);
-    destHandler.performStateMachine();
+    destHandler.stateMachine();
     metadataCheck(res, "hello.txt", "hello-cpy.txt", largerFileData.size());
-    destHandler.performStateMachine();
+    destHandler.stateMachine();
     REQUIRE(res.callStatus == CallStatus::CALL_AFTER_DELAY);
     auto transactionId = destHandler.getTransactionId();
 
     std::vector<store_address_t> idsToCheck;
     {
-      FileSize offset(0);
+      Fss offset(0);
       FileDataInfo fdPduInfo(offset, reinterpret_cast<const uint8_t*>(largerFileData.data()),
                              largerFileData.size() / 2);
       FileDataCreator fdPduCreator(conf, fdPduInfo);
@@ -223,7 +223,7 @@ TEST_CASE("CFDP Dest Handler", "[cfdp]") {
     }
 
     {
-      FileSize offset(512);
+      Fss offset(512);
       FileDataInfo fdPduInfo(offset, reinterpret_cast<const uint8_t*>(largerFileData.data() + 512),
                              largerFileData.size() / 2);
       FileDataCreator fdPduCreator(conf, fdPduInfo);
@@ -234,11 +234,11 @@ TEST_CASE("CFDP Dest Handler", "[cfdp]") {
       packetInfoList.push_back(packetInfo);
     }
 
-    destHandler.performStateMachine();
+    destHandler.stateMachine();
     fileDataPduCheck(res, idsToCheck);
     eofPreparation(cfdpFileSize, crc32);
     // After EOF, operation is done because no closure was requested
-    destHandler.performStateMachine();
+    destHandler.stateMachine();
     eofCheck(res, transactionId);
   }
 }

unittests/cfdp/handler/testDistributor.cpp

@@ -21,7 +21,7 @@ TEST_CASE("CFDP Distributor", "[cfdp][distributor]") {
   auto tcAcceptor = AcceptsTcMock("CFDP Receiver", 0, receiverQueueId);
 
   // Set up Metadata PDU for generate test data.
-  cfdp::FileSize fileSize(12);
+  cfdp::Fss fileSize(12);
   const cfdp::EntityId& sourceId(groundEntityId);
   const cfdp::EntityId& destId(obswEntityId);
   cfdp::TransactionSeqNum seqNum(UnsignedByteField<uint16_t>(12));
@@ -30,9 +30,8 @@ TEST_CASE("CFDP Distributor", "[cfdp][distributor]") {
   cfdp::StringLv sourceFileName(sourceFileString);
   std::string destFileString = "hello2.txt";
   cfdp::StringLv destFileName(destFileString);
-  MetadataInfo metadataInfo(false, cfdp::ChecksumType::CRC_32, fileSize, sourceFileName,
+  MetadataGenericInfo metadataInfo(false, cfdp::ChecksumType::CRC_32, fileSize);
-                            destFileName);
+  MetadataPduCreator creator(pduConf, metadataInfo, sourceFileName, destFileName, nullptr, 0);
-  MetadataPduCreator creator(pduConf, metadataInfo);
   uint8_t* dataPtr = nullptr;
 
   SECTION("State") {

unittests/cfdp/handler/testPutRequest.cpp

@@ -0,0 +1,59 @@
+#include <array>
+#include <catch2/catch_test_macros.hpp>
+
+#include "fsfw/cfdp/handler/PutRequest.h"
+#include "fsfw/cfdp/tlv/ReservedMessageCreator.h"
+
+TEST_CASE("Put Request", "[cfdp]") {
+  using namespace cfdp;
+  using namespace returnvalue;
+
+  std::array<uint8_t, 32> reservedMsgCustomData{};
+  std::array<uint8_t, 128> reservedMsgBuf{};
+  std::array<uint8_t, 128> buffer{};
+  EntityId destId(WidthInBytes::ONE_BYTE, 5);
+  std::string srcFileName = "hello.txt";
+  std::string destFileName = "hello2.txt";
+  uint8_t* msgBufPtr = reservedMsgCustomData.data();
+  size_t msgSize = 0;
+  cfdp::StringLv srcName(srcFileName);
+  cfdp::StringLv destName(destFileName);
+  CHECK(destId.serializeAsLv(&msgBufPtr, &msgSize, reservedMsgCustomData.size()) == OK);
+  CHECK(srcName.serialize(&msgBufPtr, &msgSize, reservedMsgCustomData.size(),
+                          SerializeIF::Endianness::NETWORK) == OK);
+  CHECK(destName.serialize(&msgBufPtr, &msgSize, reservedMsgCustomData.size(),
+                           SerializeIF::Endianness::NETWORK) == OK);
+  ReservedMessageCreator creator(static_cast<uint8_t>(ProxyOpMessageType::PUT_REQUEST),
+                                 reservedMsgCustomData.data(), msgSize);
+  msgSize = 0;
+  ReturnValue_t result = creator.serializeBe(reservedMsgBuf.data(), msgSize, buffer.size());
+  CHECK(result == returnvalue::OK);
+
+  SECTION("Put Request with reserved message") {
+    PutRequest putRequest(destId, reservedMsgBuf.data(), msgSize, nullptr, 0);
+    uint8_t* bufPtr = buffer.data();
+    size_t serLen = 0;
+    REQUIRE(putRequest.serialize(&bufPtr, &serLen, buffer.size(),
+                                 SerializeIF::Endianness::NETWORK) == OK);
+
+    CHECK(putRequest.getSerializedSize() == serLen);
+    PutRequest requestDeserialized;
+    size_t deserLen = putRequest.getSerializedSize();
+    const uint8_t* deserPtr = buffer.data();
+    REQUIRE(requestDeserialized.deSerialize(&deserPtr, &deserLen,
+                                            SerializeIF::Endianness::NETWORK) == OK);
+    CHECK(requestDeserialized.getDestId().getWidth() == destId.getWidth());
+    CHECK(requestDeserialized.getDestId().getValue() == destId.getValue());
+    size_t totalMsgsSize = 0;
+    const uint8_t* msgsToUserStart = requestDeserialized.getMessagesToUser(totalMsgsSize);
+    CHECK(totalMsgsSize == msgSize);
+    cfdp::Tlv genericTlv;
+    genericTlv.deSerialize(&msgsToUserStart, &totalMsgsSize, SerializeIF::Endianness::NETWORK);
+    CHECK(genericTlv.getType() == TlvType::MSG_TO_USER);
+    CHECK(genericTlv.getLengthField() == genericTlv.getSerializedSize() - 2);
+    CHECK(genericTlv.getValue()[0] == 'c');
+    CHECK(genericTlv.getValue()[1] == 'f');
+    CHECK(genericTlv.getValue()[2] == 'd');
+    CHECK(genericTlv.getValue()[3] == 'p');
+  }
+}

unittests/cfdp/handler/testReservedMsgParser.cpp

@@ -0,0 +1,67 @@
+#include <catch2/catch_test_macros.hpp>
+
+#include "fsfw/cfdp/CfdpMessage.h"
+#include "fsfw/cfdp/VarLenFields.h"
+#include "fsfw/cfdp/handler/PutRequest.h"
+#include "fsfw/cfdp/handler/ReservedMessageParser.h"
+#include "fsfw/cfdp/tlv/Lv.h"
+#include "fsfw/cfdp/tlv/ReservedMessageCreator.h"
+#include "fsfw/cfdp/tlv/StringLv.h"
+#include "fsfw/globalfunctions/arrayprinter.h"
+#include "fsfw/serialize.h"
+#include "mocks/MessageQueueMock.h"
+#include "mocks/StorageManagerMock.h"
+
+TEST_CASE("Reserved Message Parser", "[cfdp]") {
+  using namespace cfdp;
+  using namespace returnvalue;
+
+  std::string srcFileName = "hello.txt";
+  std::string destFileName = "hello2.txt";
+  MessageQueueId_t destQueueId = 2;
+  MessageQueueMock msgQueue(1);
+  LocalPool::LocalPoolConfig storeCfg = {{10, 32}, {10, 64}, {10, 128}, {10, 1024}};
+  StorageManagerMock ipcStore(0, storeCfg);
+  std::array<uint8_t, 128> buffer{};
+  uint8_t msgBuf[32]{};
+
+  EntityId entityId(cfdp::WidthInBytes::ONE_BYTE, 5);
+  uint8_t* msgBufPtr = msgBuf;
+  size_t serLen = 0;
+  cfdp::StringLv srcName(srcFileName);
+  cfdp::StringLv destName(destFileName);
+  CHECK(entityId.serializeAsLv(&msgBufPtr, &serLen, sizeof(msgBuf)) == OK);
+  CHECK(srcName.serialize(&msgBufPtr, &serLen, sizeof(msgBuf), SerializeIF::Endianness::NETWORK) ==
+        OK);
+  CHECK(destName.serialize(&msgBufPtr, &serLen, sizeof(msgBuf), SerializeIF::Endianness::NETWORK) ==
+        OK);
+  ReservedMessageCreator creator(static_cast<uint8_t>(ProxyOpMessageType::PUT_REQUEST), msgBuf,
+                                 serLen);
+  serLen = 0;
+  ReturnValue_t result = creator.serializeBe(buffer.data(), serLen, buffer.size());
+  CHECK(result == returnvalue::OK);
+  MessageToUserTlv msgToUser;
+  CHECK(msgToUser.deSerializeBe(buffer.data(), serLen, buffer.size()) == OK);
+  ReservedMessageParser parser(ipcStore, msgQueue, destQueueId);
+  REQUIRE(parser.parse(&msgToUser, 1) == OK);
+  CommandMessage msg;
+  CHECK(msgQueue.wasMessageSent());
+  CHECK(msgQueue.numberOfSentMessages() == 1);
+  CHECK(msgQueue.getNextSentMessage(destQueueId, msg) == OK);
+  store_address_t storeId = CfdpMessage::getStoreId(&msg);
+  const uint8_t* data;
+  size_t packetLen;
+  CHECK(ipcStore.getData(storeId, &data, &packetLen) == OK);
+  CHECK(packetLen > 0);
+  PutRequest putRequest;
+  size_t dummy = packetLen;
+  REQUIRE(putRequest.deSerialize(&data, &dummy, SerializeIF::Endianness::MACHINE) == OK);
+  CHECK(putRequest.getDestId().getValue() == entityId.getValue());
+  CHECK(putRequest.getDestId().getWidth() == entityId.getWidth());
+  auto& sourceNameLv = putRequest.getSourceName();
+  std::string srcNameRead = sourceNameLv.getString();
+  CHECK(srcNameRead == srcFileName);
+  auto& destNameLv = putRequest.getDestName();
+  std::string destNameRead = destNameLv.getString();
+  CHECK(destNameRead == destFileName);
+}

unittests/cfdp/handler/testSourceHandler.cpp

@@ -1,3 +1,286 @@
-#include <catch2/catch_test_macros.hpp>
+#include <etl/crc32.h>
 
-TEST_CASE("CFDP Source Handler", "[cfdp]") {}
+#include <catch2/catch_test_macros.hpp>
+#include <filesystem>
+#include <random>
+
+#include "fsfw/cfdp.h"
+#include "fsfw/cfdp/handler/PutRequest.h"
+#include "fsfw/cfdp/handler/SourceHandler.h"
+#include "fsfw/cfdp/pdu/EofPduCreator.h"
+#include "fsfw/cfdp/pdu/EofPduReader.h"
+#include "fsfw/cfdp/pdu/FileDataReader.h"
+#include "fsfw/cfdp/pdu/MetadataPduCreator.h"
+#include "fsfw/cfdp/pdu/MetadataPduReader.h"
+#include "fsfw/tmtcservices/TmTcMessage.h"
+#include "fsfw/util/SeqCountProvider.h"
+#include "mocks/AcceptsTmMock.h"
+#include "mocks/EventReportingProxyMock.h"
+#include "mocks/FilesystemMock.h"
+#include "mocks/MessageQueueMock.h"
+#include "mocks/StorageManagerMock.h"
+#include "mocks/cfdp/FaultHandlerMock.h"
+#include "mocks/cfdp/RemoteConfigTableMock.h"
+#include "mocks/cfdp/UserMock.h"
+
+TEST_CASE("CFDP Source Handler", "[cfdp]") {
+  using namespace cfdp;
+  using namespace returnvalue;
+  using namespace std::filesystem;
+  const size_t MAX_FILE_SEGMENT_SIZE = 255;
+
+  MessageQueueId_t destQueueId = 2;
+  AcceptsTmMock tmReceiver(destQueueId);
+  MessageQueueMock mqMock(destQueueId);
+  EntityId localId = EntityId(UnsignedByteField<uint16_t>(2));
+  EntityId remoteId = EntityId(UnsignedByteField<uint16_t>(5));
+  FaultHandlerMock fhMock;
+  LocalEntityCfg localEntityCfg(localId, IndicationCfg(), fhMock);
+  FilesystemMock fsMock;
+  UserMock userMock(fsMock);
+  SeqCountProviderU16 seqCountProvider;
+  SourceHandlerParams dp(localEntityCfg, userMock, seqCountProvider);
+
+  EventReportingProxyMock eventReporterMock;
+  LocalPool::LocalPoolConfig storeCfg = {{10, 32}, {10, 64}, {10, 128}, {10, 1024}};
+  StorageManagerMock tcStore(2, storeCfg);
+  StorageManagerMock tmStore(3, storeCfg);
+  FsfwParams fp(tmReceiver, &mqMock, &eventReporterMock);
+  fp.tcStore = &tcStore;
+  fp.tmStore = &tmStore;
+  auto sourceHandler = SourceHandler(dp, fp);
+
+  RemoteEntityCfg cfg;
+  cfg.maxFileSegmentLen = MAX_FILE_SEGMENT_SIZE;
+  cfg.remoteId = remoteId;
+  std::string srcFileName = "/tmp/cfdp-test.txt";
+  std::string destFileName = "/tmp/cfdp-test2.txt";
+  FilesystemParams srcFileNameFs(srcFileName.c_str());
+  fsMock.createFile(srcFileNameFs);
+  cfdp::StringLv srcNameLv(srcFileNameFs.path, std::strlen(srcFileNameFs.path));
+  FilesystemParams destFileNameFs(destFileName.c_str());
+  cfdp::StringLv destNameLv(destFileNameFs.path, std::strlen(destFileNameFs.path));
+  PutRequest putRequest(remoteId, srcNameLv, destNameLv);
+  CHECK(sourceHandler.initialize() == OK);
+
+  auto onePduSentCheck = [&](const SourceHandler::FsmResult& fsmResult, TmTcMessage& tmtcMessage,
+                             const uint8_t** pduPtr) {
+    CHECK(fsmResult.errors == 0);
+    CHECK(fsmResult.packetsSent == 1);
+    CHECK(mqMock.numberOfSentMessages() == 1);
+    REQUIRE(mqMock.getNextSentMessage(destQueueId, tmtcMessage) == OK);
+    auto accessor = tmStore.getData(tmtcMessage.getStorageId());
+    REQUIRE(accessor.first == OK);
+    *pduPtr = accessor.second.data();
+    return std::move(accessor);
+  };
+  auto genericMetadataCheck = [&](const SourceHandler::FsmResult& fsmResult,
+                                  size_t expectedFileSize, uint16_t expectedSeqNum) {
+    CHECK(fsmResult.errors == 0);
+    CHECK(fsmResult.callStatus == CallStatus::CALL_AGAIN);
+    TmTcMessage tmtcMessage;
+    const uint8_t* pduPtr;
+    auto accessor = onePduSentCheck(fsmResult, tmtcMessage, &pduPtr);
+    CHECK(accessor.second.size() == 55);
+    MetadataGenericInfo metadataInfo;
+    MetadataPduReader metadataReader(pduPtr, accessor.second.size(), metadataInfo, nullptr, 0);
+    REQUIRE(metadataReader.parseData() == OK);
+    std::string srcNameRead = metadataReader.getSourceFileName().getString();
+    CHECK(srcNameRead == srcFileName);
+    TransactionSeqNum seqNum;
+    metadataReader.getTransactionSeqNum(seqNum);
+    CHECK(seqNum.getValue() == expectedSeqNum);
+    CHECK(userMock.transactionIndicRecvd.size() == 1);
+    CHECK(userMock.transactionIndicRecvd.back() == TransactionId(localId, seqNum));
+    EntityId srcId;
+    metadataReader.getSourceId(srcId);
+    EntityId destId;
+    metadataReader.getDestId(destId);
+    CHECK(srcId.getValue() == localId.getValue());
+    CHECK(destId.getValue() == remoteId.getValue());
+    std::string destNameRead = metadataReader.getDestFileName().getString();
+    CHECK(destNameRead == destFileName);
+    if (expectedFileSize == 0) {
+      CHECK(metadataInfo.getChecksumType() == ChecksumType::NULL_CHECKSUM);
+    } else {
+      CHECK(metadataInfo.getChecksumType() == ChecksumType::CRC_32);
+    }
+    CHECK(metadataInfo.getFileSize().value() == expectedFileSize);
+    CHECK(!metadataInfo.isClosureRequested());
+    mqMock.clearMessages();
+  };
+  auto genericEofCheck = [&](const SourceHandler::FsmResult& fsmResult, size_t expectedFileSize,
+                             uint32_t expectedChecksum, uint16_t expectedSeqNum) {
+    CHECK(fsmResult.errors == 0);
+    CHECK(fsmResult.callStatus == CallStatus::CALL_AGAIN);
+    TmTcMessage tmtcMessage;
+    const uint8_t* pduPtr;
+    auto accessor = onePduSentCheck(fsmResult, tmtcMessage, &pduPtr);
+    // 10 byte PDU header, 1 byte directive field, 1 byte condition code, 4 byte checksum,
+    // 4 byte FSS
+    CHECK(accessor.second.size() == 20);
+    EofInfo eofInfo;
+    EofPduReader eofReader(pduPtr, accessor.second.size(), eofInfo);
+    REQUIRE(eofReader.parseData() == OK);
+    TransactionSeqNum seqNum;
+    eofReader.getTransactionSeqNum(seqNum);
+    CHECK(seqNum.getValue() == expectedSeqNum);
+    auto transactionId = TransactionId(localId, seqNum);
+    CHECK(userMock.eofSentRecvd.size() == 1);
+    CHECK(userMock.eofSentRecvd.back() == transactionId);
+    CHECK(eofInfo.getChecksum() == expectedChecksum);
+    CHECK(eofInfo.getConditionCode() == ConditionCode::NO_ERROR);
+    CHECK(eofInfo.getFileSize().value() == expectedFileSize);
+  };
+  auto genericNoticeOfCompletionCheck = [&](const SourceHandler::FsmResult& fsmResult,
+                                            uint16_t expectedSeqNum) {
+    CHECK(fsmResult.callStatus == CallStatus::DONE);
+    CHECK(userMock.finishedRecvd.size() == 1);
+    CHECK(userMock.finishedRecvd.back().first ==
+          TransactionId(localId, TransactionSeqNum(cfdp::WidthInBytes::TWO_BYTES, expectedSeqNum)));
+    CHECK(sourceHandler.getStep() == SourceHandler::TransactionStep::IDLE);
+    CHECK(sourceHandler.getState() == CfdpState::IDLE);
+  };
+
+  SECTION("Test Basic") {
+    CHECK(sourceHandler.getState() == CfdpState::IDLE);
+    CHECK(sourceHandler.getStep() == SourceHandler::TransactionStep::IDLE);
+  }
+
+  SECTION("Transfer empty file") {
+    CHECK(sourceHandler.transactionStart(putRequest, cfg) == OK);
+
+    size_t expectedFileSize = 0;
+    const SourceHandler::FsmResult& fsmResult = sourceHandler.stateMachine();
+    // Verify metadata PDU was sent.
+    genericMetadataCheck(fsmResult, expectedFileSize, 0);
+
+    sourceHandler.stateMachine();
+    // Verify EOF PDU was sent. No file data PDU is sent for an empty file and the checksum is 0.
+    genericEofCheck(fsmResult, expectedFileSize, 0, 0);
+
+    // Verify notice of completion.
+    sourceHandler.stateMachine();
+    genericNoticeOfCompletionCheck(fsmResult, 0);
+  }
+
+  SECTION("Transfer small file") {
+    uint16_t expectedSeqNum = 0;
+    fsMock.createFile(srcFileNameFs);
+    std::string fileContent = "hello world\n";
+    size_t expectedFileSize = fileContent.size();
+    FileOpParams params(srcFileName.c_str(), expectedFileSize);
+    fsMock.writeToFile(params, reinterpret_cast<const uint8_t*>(fileContent.data()));
+    CHECK(sourceHandler.transactionStart(putRequest, cfg) == OK);
+    const SourceHandler::FsmResult& fsmResult = sourceHandler.stateMachine();
+
+    // Verify metadata PDU was sent.
+    genericMetadataCheck(fsmResult, expectedFileSize, expectedSeqNum);
+
+    // Verify that a small file data PDU was sent.
+    sourceHandler.stateMachine();
+    TmTcMessage tmtcMessage;
+    const uint8_t* pduPtr;
+    auto accessor = onePduSentCheck(fsmResult, tmtcMessage, &pduPtr);
+    FileDataInfo fdInfo;
+    FileDataReader fdReader(pduPtr, accessor.second.size(), fdInfo);
+    // 10 byte PDU header, 4 byte offset, 12 bytes file data.
+    CHECK(accessor.second.size() == 26);
+    CHECK(fdReader.parseData() == OK);
+    CHECK(fdInfo.getOffset().value() == 0);
+    size_t fileSize = 0;
+    const uint8_t* fileData = fdInfo.getFileData(&fileSize);
+    REQUIRE(fileSize == fileContent.size());
+    CHECK(fileData != nullptr);
+    std::string dataReadBack(reinterpret_cast<const char*>(fileData), fileSize);
+    CHECK(dataReadBack == fileContent);
+    mqMock.clearMessages();
+
+    sourceHandler.stateMachine();
+
+    etl::crc32 crcCalc;
+    crcCalc.add(fileContent.data(), fileContent.data() + fileContent.size());
+    // Verify EOF PDU was sent.
+    genericEofCheck(fsmResult, expectedFileSize, crcCalc.value(), expectedSeqNum);
+
+    // Verify notice of completion.
+    sourceHandler.stateMachine();
+    genericNoticeOfCompletionCheck(fsmResult, expectedSeqNum);
+  }
+
+  SECTION("Transfer two segment file") {
+    uint16_t expectedSeqNum = 0;
+    // Create 400 bytes of random data. This should result in two file segments, with one
+    // having the maximum size.
+    std::random_device dev;
+    std::mt19937 rng(dev());
+    std::uniform_int_distribution<std::mt19937::result_type> distU8(0, 255);
+    std::array<uint8_t, 400> largerFileData{};
+    for (auto& val : largerFileData) {
+      val = distU8(rng);
+    }
+    size_t expectedFileSize = largerFileData.size();
+    fsMock.createFile(srcFileNameFs);
+    FileOpParams params(srcFileName.c_str(), expectedFileSize);
+    fsMock.writeToFile(params, reinterpret_cast<const uint8_t*>(largerFileData.data()));
+    CHECK(sourceHandler.transactionStart(putRequest, cfg) == OK);
+    const SourceHandler::FsmResult& fsmResult = sourceHandler.stateMachine();
+    // Verify metadata PDU was sent.
+    genericMetadataCheck(fsmResult, expectedFileSize, expectedSeqNum);
+
+    // Check first file data PDU. It should have the maximum file segment size.
+    sourceHandler.stateMachine();
+    TmTcMessage tmtcMessage;
+    const uint8_t* pduPtr;
+    FileDataInfo fdInfo;
+    {
+      CHECK(fsmResult.callStatus == CallStatus::CALL_AGAIN);
+      auto accessor = onePduSentCheck(fsmResult, tmtcMessage, &pduPtr);
+      FileDataReader fdReader(pduPtr, accessor.second.size(), fdInfo);
+      // 10 byte PDU header, 4 byte offset, 255 byte file data
+      CHECK(accessor.second.size() == 269);
+      CHECK(fdReader.parseData() == OK);
+      CHECK(fdInfo.getOffset().value() == 0);
+      size_t fileSize = 0;
+      const uint8_t* fileData = fdInfo.getFileData(&fileSize);
+      // Maximum file segment size.
+      REQUIRE(fileSize == MAX_FILE_SEGMENT_SIZE);
+      for (unsigned i = 0; i < fileSize; i++) {
+        CHECK(fileData[i] == largerFileData[i]);
+      }
+    }
+    mqMock.clearMessages();
+
+    // Check second file data PDU.
+    sourceHandler.stateMachine();
+    {
+      CHECK(fsmResult.callStatus == CallStatus::CALL_AGAIN);
+      auto accessor = onePduSentCheck(fsmResult, tmtcMessage, &pduPtr);
+      FileDataReader fdReader(pduPtr, accessor.second.size(), fdInfo);
+      // 10 byte PDU header, 4 byte offset, remaining file data (400 - 255 == 145).
+      CHECK(accessor.second.size() == 10 + 4 + largerFileData.size() - MAX_FILE_SEGMENT_SIZE);
+      CHECK(fdReader.parseData() == OK);
+      CHECK(fdInfo.getOffset().value() == MAX_FILE_SEGMENT_SIZE);
+      size_t fileDataSize = 0;
+      const uint8_t* fileData = fdInfo.getFileData(&fileDataSize);
+      // Maximum file segment size.
+      REQUIRE(fileDataSize == largerFileData.size() - MAX_FILE_SEGMENT_SIZE);
+      for (unsigned i = 0; i < fileDataSize; i++) {
+        CHECK(fileData[i] == largerFileData[MAX_FILE_SEGMENT_SIZE + i]);
+      }
+    }
+    mqMock.clearMessages();
+
+    // Check EOF and verify checksum.
+    sourceHandler.stateMachine();
+
+    etl::crc32 crcCalc;
+    crcCalc.add(largerFileData.data(), largerFileData.data() + largerFileData.size());
+    // Verify EOF PDU was sent.
+    genericEofCheck(fsmResult, expectedFileSize, crcCalc.value(), expectedSeqNum);
+
+    // Verify notice of completion.
+    sourceHandler.stateMachine();
+    genericNoticeOfCompletionCheck(fsmResult, expectedSeqNum);
+  }
+}

unittests/cfdp/pdu/testCfdpHeader.cpp

@@ -110,9 +110,9 @@ TEST_CASE("CFDP Header", "[cfdp]") {
     }
 
     SECTION("Other variable sized fields") {
-      pduConf.seqNum.setValue(cfdp::WidthInBytes::TWO_BYTES, 0x0fff);
+      pduConf.seqNum.setValueAndWidth(cfdp::WidthInBytes::TWO_BYTES, 0x0fff);
-      pduConf.sourceId.setValue(cfdp::WidthInBytes::FOUR_BYTES, 0xff00ff00);
+      pduConf.sourceId.setValueAndWidth(cfdp::WidthInBytes::FOUR_BYTES, 0xff00ff00);
-      pduConf.destId.setValue(cfdp::WidthInBytes::FOUR_BYTES, 0x00ff00ff);
+      pduConf.destId.setValueAndWidth(cfdp::WidthInBytes::FOUR_BYTES, 0x00ff00ff);
       REQUIRE(pduConf.sourceId.getSerializedSize() == 4);
       REQUIRE(creator.getSerializedSize() == 14);
       REQUIRE(creator.serialize(&serTarget, &serSize, serBuf.size(),
@@ -146,9 +146,9 @@ TEST_CASE("CFDP Header", "[cfdp]") {
     }
 
     SECTION("Buffer Too Short") {
-      pduConf.seqNum.setValue(cfdp::WidthInBytes::TWO_BYTES, 0x0fff);
+      pduConf.seqNum.setValueAndWidth(cfdp::WidthInBytes::TWO_BYTES, 0x0fff);
-      pduConf.sourceId.setValue(cfdp::WidthInBytes::FOUR_BYTES, 0xff00ff00);
+      pduConf.sourceId.setValueAndWidth(cfdp::WidthInBytes::FOUR_BYTES, 0xff00ff00);
-      pduConf.destId.setValue(cfdp::WidthInBytes::FOUR_BYTES, 0x00ff00ff);
+      pduConf.destId.setValueAndWidth(cfdp::WidthInBytes::FOUR_BYTES, 0x00ff00ff);
       for (uint8_t idx = 0; idx < 14; idx++) {
         REQUIRE(creator.serialize(&serTarget, &serSize, idx, SerializeIF::Endianness::BIG) ==
                 SerializeIF::BUFFER_TOO_SHORT);
@@ -157,11 +157,11 @@ TEST_CASE("CFDP Header", "[cfdp]") {
   }
 
   SECTION("Invalid Variable Sized Fields") {
-    result = pduConf.sourceId.setValue(cfdp::WidthInBytes::ONE_BYTE, 0xfff);
+    result = pduConf.sourceId.setValueAndWidth(cfdp::WidthInBytes::ONE_BYTE, 0xfff);
     REQUIRE(result == returnvalue::FAILED);
-    result = pduConf.sourceId.setValue(cfdp::WidthInBytes::TWO_BYTES, 0xfffff);
+    result = pduConf.sourceId.setValueAndWidth(cfdp::WidthInBytes::TWO_BYTES, 0xfffff);
     REQUIRE(result == returnvalue::FAILED);
-    result = pduConf.sourceId.setValue(cfdp::WidthInBytes::FOUR_BYTES, 0xfffffffff);
+    result = pduConf.sourceId.setValueAndWidth(cfdp::WidthInBytes::FOUR_BYTES, 0xfffffffff);
     REQUIRE(result == returnvalue::FAILED);
   }
 
@@ -207,7 +207,7 @@ TEST_CASE("CFDP Header", "[cfdp]") {
                                  SerializeIF::Endianness::MACHINE);
     REQUIRE(pduConf.sourceId.getValue() == 0xf0f0f0f0);
 
-    pduConf.sourceId.setValue(cfdp::WidthInBytes::ONE_BYTE, 1);
+    pduConf.sourceId.setValueAndWidth(cfdp::WidthInBytes::ONE_BYTE, 1);
     serTarget = serBuf.data();
     serSize = 1;
     result = pduConf.sourceId.serialize(&serTarget, &serSize, 1, SerializeIF::Endianness::MACHINE);
@@ -257,11 +257,11 @@ TEST_CASE("CFDP Header", "[cfdp]") {
     creator.setSegmentationControl(cfdp::SegmentationControl::RECORD_BOUNDARIES_PRESERVATION);
     creator.setPduType(cfdp::PduType::FILE_DATA);
     creator.setSegmentMetadataFlag(cfdp::SegmentMetadataFlag::PRESENT);
-    result = pduConf.seqNum.setValue(cfdp::WidthInBytes::TWO_BYTES, 0x0fff);
+    result = pduConf.seqNum.setValueAndWidth(cfdp::WidthInBytes::TWO_BYTES, 0x0fff);
     REQUIRE(result == returnvalue::OK);
-    result = pduConf.sourceId.setValue(cfdp::WidthInBytes::FOUR_BYTES, 0xff00ff00);
+    result = pduConf.sourceId.setValueAndWidth(cfdp::WidthInBytes::FOUR_BYTES, 0xff00ff00);
     REQUIRE(result == returnvalue::OK);
-    result = pduConf.destId.setValue(cfdp::WidthInBytes::FOUR_BYTES, 0x00ff00ff);
+    result = pduConf.destId.setValueAndWidth(cfdp::WidthInBytes::FOUR_BYTES, 0x00ff00ff);
     REQUIRE(result == returnvalue::OK);
     serTarget = serBuf.data();
     serSize = 0;
@@ -302,8 +302,8 @@ TEST_CASE("CFDP Header", "[cfdp]") {
     SECTION("Manipulate Source Dest ID") {
       serTarget = serBuf.data();
       serSize = 0;
-      pduConf.sourceId.setValue(cfdp::WidthInBytes::ONE_BYTE, 22);
+      pduConf.sourceId.setValueAndWidth(cfdp::WidthInBytes::ONE_BYTE, 22);
-      pduConf.destId.setValue(cfdp::WidthInBytes::ONE_BYTE, 48);
+      pduConf.destId.setValueAndWidth(cfdp::WidthInBytes::ONE_BYTE, 48);
       result = creator.serialize(&serTarget, &serSize, serBuf.size(), SerializeIF::Endianness::BIG);
       reader.getSourceId(sourceDestId);
       REQUIRE(sourceDestId.getWidth() == cfdp::WidthInBytes::ONE_BYTE);

unittests/cfdp/pdu/testEofPdu.cpp

@@ -14,7 +14,7 @@ TEST_CASE("EOF PDU", "[cfdp][pdu]") {
   size_t sz = 0;
   EntityId destId(WidthInBytes::TWO_BYTES, 2);
   EntityIdTlv faultLoc(destId);
-  FileSize fileSize(12);
+  Fss fileSize(12);
   // We can already set the fault location, it will be ignored
   EofInfo eofInfo(cfdp::ConditionCode::NO_ERROR, 5, fileSize, &faultLoc);
   TransactionSeqNum seqNum(WidthInBytes::TWO_BYTES, 15);

unittests/cfdp/pdu/testFileData.cpp

@@ -22,7 +22,7 @@ TEST_CASE("File Data PDU", "[cfdp][pdu]") {
   for (uint8_t idx = 0; idx < 10; idx++) {
     fileBuffer[idx] = idx;
   }
-  FileSize offset(50);
+  Fss offset(50);
   FileDataInfo info(offset, fileBuffer.data(), 10);
 
   SECTION("Serialization") {
@@ -107,8 +107,7 @@ TEST_CASE("File Data PDU", "[cfdp][pdu]") {
         serializer.serialize(&buffer, &sz, fileDataBuffer.size(), SerializeIF::Endianness::NETWORK);
     REQUIRE(result == returnvalue::OK);
 
-    FileSize emptyOffset;
+    FileDataInfo emptyInfo;
-    FileDataInfo emptyInfo(emptyOffset);
     FileDataReader deserializer(fileDataBuffer.data(), fileDataBuffer.size(), emptyInfo);
     result = deserializer.parseData();
     REQUIRE(result == returnvalue::OK);

unittests/cfdp/pdu/testKeepAlivePdu.cpp

@@ -16,7 +16,7 @@ TEST_CASE("Keep Alive PDU", "[cfdp][pdu]") {
   EntityId sourceId(WidthInBytes::TWO_BYTES, 1);
   PduConfig pduConf(sourceId, destId, TransmissionMode::ACKNOWLEDGED, seqNum);
 
-  FileSize progress(0x50);
+  Fss progress(0x50);
 
   SECTION("Serialize") {
     KeepAlivePduCreator serializer(pduConf, progress);

unittests/cfdp/pdu/testMetadataPdu.cpp

@@ -6,11 +6,10 @@
 #include "fsfw/cfdp/pdu/MetadataPduReader.h"
 #include "fsfw/cfdp/tlv/FilestoreResponseTlv.h"
 #include "fsfw/cfdp/tlv/MessageToUserTlv.h"
-#include "fsfw/globalfunctions/arrayprinter.h"
 
 TEST_CASE("Metadata PDU", "[cfdp][pdu]") {
   using namespace cfdp;
-  ReturnValue_t result = returnvalue::OK;
+  ReturnValue_t result;
   std::array<uint8_t, 256> mdBuffer = {};
   uint8_t* buffer = mdBuffer.data();
   size_t sz = 0;
@@ -22,30 +21,22 @@ TEST_CASE("Metadata PDU", "[cfdp][pdu]") {
   std::string firstFileName = "hello.txt";
   cfdp::StringLv sourceFileName(firstFileName);
   cfdp::StringLv destFileName;
-  FileSize fileSize(35);
+  Fss fileSize(35);
-  MetadataInfo info(false, ChecksumType::MODULAR, fileSize, sourceFileName, destFileName);
+  MetadataGenericInfo info(false, ChecksumType::MODULAR, fileSize);
 
   FilestoreResponseTlv response(FilestoreActionCode::CREATE_DIRECTORY, FSR_CREATE_NOT_ALLOWED,
                                 sourceFileName, nullptr);
   std::array<uint8_t, 3> msg = {0x41, 0x42, 0x43};
   cfdp::Tlv responseTlv;
   std::array<uint8_t, 64> responseBuf = {};
-  uint8_t* responseBufPtr = responseBuf.data();
   response.convertToTlv(responseTlv, buffer, responseBuf.size(), SerializeIF::Endianness::MACHINE);
   MessageToUserTlv msgToUser(msg.data(), msg.size());
   std::array<Tlv*, 2> options{&responseTlv, &msgToUser};
+  std::array<Tlv, 5> tlvDeser{};
   REQUIRE(options[0]->getSerializedSize() == 2 + 1 + 10 + 1);
   REQUIRE(options[1]->getSerializedSize() == 5);
 
-  SECTION("Serialize") {
+  auto metadataCheckPartOne = [&]() {
-    MetadataPduCreator serializer(pduConf, info);
-    result = serializer.serialize(&buffer, &sz, mdBuffer.size(), SerializeIF::Endianness::NETWORK);
-    REQUIRE(result == returnvalue::OK);
-    REQUIRE(serializer.getWholePduSize() == 27);
-    REQUIRE(info.getSourceFileName().getSerializedSize() == 10);
-    REQUIRE(info.getDestFileName().getSerializedSize() == 1);
-    REQUIRE(info.getSerializedSize() == 16);
-    REQUIRE((mdBuffer[1] << 8 | mdBuffer[2]) == 17);
     REQUIRE(mdBuffer[10] == FileDirective::METADATA);
     // no closure requested and checksum type is modular => 0x00
     REQUIRE(mdBuffer[11] == 0x00);
@@ -64,20 +55,59 @@ TEST_CASE("Metadata PDU", "[cfdp][pdu]") {
     REQUIRE(mdBuffer[23] == 't');
     REQUIRE(mdBuffer[24] == 'x');
     REQUIRE(mdBuffer[25] == 't');
-    REQUIRE(mdBuffer[26] == 0);
+  };
 
+  SECTION("Serialize with empty dest name") {
+    MetadataPduCreator serializer(pduConf, info, sourceFileName, destFileName, nullptr, 0);
+    result = serializer.serialize(&buffer, &sz, mdBuffer.size(), SerializeIF::Endianness::NETWORK);
+    REQUIRE(result == returnvalue::OK);
+    CHECK(sz == serializer.getSerializedSize());
+    // 10 byte heater + 1 byte PDU directive field + 1 byte PDU content + FSS field (4) + source
+    // name field (10) + dest name field (1).
+    REQUIRE(serializer.getWholePduSize() == 27);
+    REQUIRE(serializer.getSourceFileName().getSerializedSize() == 10);
+    REQUIRE(serializer.getDestFileName().getSerializedSize() == 1);
+    REQUIRE(info.getSerializedSize() == 5);
+    REQUIRE((mdBuffer[1] << 8 | mdBuffer[2]) == 17);
+    REQUIRE(serializer.getSerializedSize() == serializer.getWholePduSize());
+    metadataCheckPartOne();
+    REQUIRE(mdBuffer[26] == 0);
+  }
+
+  SECTION("Serialize with dest name") {
+    std::string secondFileName = "hello2.txt";
+    cfdp::StringLv destFileName2(secondFileName);
+    MetadataPduCreator serializer(pduConf, info, sourceFileName, destFileName2, nullptr, 0);
+    result = serializer.serialize(&buffer, &sz, mdBuffer.size(), SerializeIF::Endianness::NETWORK);
+    REQUIRE(result == returnvalue::OK);
+    // 10 byte heater + 1 byte PDU directive field + 1 byte PDU content + FSS field (4) + source
+    // name field (10) + dest name field (11).
+    REQUIRE(serializer.getWholePduSize() == 37);
+    CHECK(sz == serializer.getSerializedSize());
+    REQUIRE((mdBuffer[1] << 8 | mdBuffer[2]) == 27);
+    REQUIRE(serializer.getSerializedSize() == serializer.getWholePduSize());
+    metadataCheckPartOne();
+    // Size of destination name field
+    REQUIRE(mdBuffer[26] == 10);
+    REQUIRE(mdBuffer[27] == 'h');
+    REQUIRE(mdBuffer[28] == 'e');
+    REQUIRE(mdBuffer[29] == 'l');
+    REQUIRE(mdBuffer[30] == 'l');
+    REQUIRE(mdBuffer[31] == 'o');
+    REQUIRE(mdBuffer[32] == '2');
+    REQUIRE(mdBuffer[33] == '.');
+    REQUIRE(mdBuffer[34] == 't');
+    REQUIRE(mdBuffer[35] == 'x');
+    REQUIRE(mdBuffer[36] == 't');
+  }
+
+  SECTION("Serialize with 2 options") {
     std::string otherFileName = "hello2.txt";
     cfdp::StringLv otherFileNameLv(otherFileName.data(), otherFileName.size());
-    info.setSourceFileName(otherFileNameLv);
+    MetadataPduCreator serializer(pduConf, info, otherFileNameLv, destFileName, options.data(),
-    size_t sizeOfOptions = options.size();
+                                  options.size());
-    info.setOptionsArray(options.data(), sizeOfOptions, sizeOfOptions);
-    REQUIRE(info.getMaxOptionsLen() == 2);
-    info.setMaxOptionsLen(3);
-    REQUIRE(info.getMaxOptionsLen() == 3);
     info.setChecksumType(cfdp::ChecksumType::CRC_32C);
     info.setClosureRequested(true);
-    uint8_t* buffer = mdBuffer.data();
-    size_t sz = 0;
     serializer.updateDirectiveFieldLen();
 
     result = serializer.serialize(&buffer, &sz, mdBuffer.size(), SerializeIF::Endianness::NETWORK);
@@ -98,49 +128,47 @@ TEST_CASE("Metadata PDU", "[cfdp][pdu]") {
     // TLV unittests
     REQUIRE(sz == 10 + 37);
     for (size_t maxSz = 0; maxSz < sz; maxSz++) {
-      uint8_t* buffer = mdBuffer.data();
+      buffer = mdBuffer.data();
-      size_t sz = 0;
+      sz = 0;
       result = serializer.serialize(&buffer, &sz, maxSz, SerializeIF::Endianness::NETWORK);
       REQUIRE(result == SerializeIF::BUFFER_TOO_SHORT);
     }
     for (size_t initSz = 1; initSz < 47; initSz++) {
-      uint8_t* buffer = mdBuffer.data();
+      buffer = mdBuffer.data();
-      size_t sz = initSz;
+      sz = initSz;
       result = serializer.serialize(&buffer, &sz, 46, SerializeIF::Endianness::NETWORK);
       REQUIRE(result == SerializeIF::BUFFER_TOO_SHORT);
     }
-    info.setDestFileName(destFileName);
   }
 
   SECTION("Deserialize") {
-    MetadataPduCreator serializer(pduConf, info);
+    MetadataPduCreator serializer(pduConf, info, sourceFileName, destFileName, nullptr, 0);
     result = serializer.serialize(&buffer, &sz, mdBuffer.size(), SerializeIF::Endianness::NETWORK);
     REQUIRE(result == returnvalue::OK);
 
-    MetadataPduReader deserializer(mdBuffer.data(), mdBuffer.size(), info);
+    MetadataPduReader deserializer(mdBuffer.data(), mdBuffer.size(), info, nullptr, 0);
     result = deserializer.parseData();
     REQUIRE(result == returnvalue::OK);
     size_t fullSize = deserializer.getWholePduSize();
     for (size_t maxSz = 0; maxSz < fullSize; maxSz++) {
-      MetadataPduReader invalidSzDeser(mdBuffer.data(), maxSz, info);
+      MetadataPduReader invalidSzDeser(mdBuffer.data(), maxSz, info, nullptr, 0);
       result = invalidSzDeser.parseData();
       REQUIRE(result != returnvalue::OK);
     }
-    size_t sizeOfOptions = options.size();
+  }
-    size_t maxSize = 4;
+
-    info.setOptionsArray(options.data(), sizeOfOptions, maxSize);
+  SECTION("Deserialize with 2 options") {
-    REQUIRE(info.getOptionsLen() == 2);
+    MetadataPduCreator serializer(pduConf, info, sourceFileName, destFileName, options.data(),
+                                  options.size());
     info.setChecksumType(cfdp::ChecksumType::CRC_32C);
     info.setClosureRequested(true);
-    uint8_t* buffer = mdBuffer.data();
-    size_t sz = 0;
     serializer.updateDirectiveFieldLen();
 
-    info.setSourceFileName(sourceFileName);
     result = serializer.serialize(&buffer, &sz, mdBuffer.size(), SerializeIF::Endianness::NETWORK);
     REQUIRE(result == returnvalue::OK);
 
-    MetadataPduReader deserializer2(mdBuffer.data(), mdBuffer.size(), info);
+    MetadataPduReader deserializer2(mdBuffer.data(), mdBuffer.size(), info, tlvDeser.data(),
+                                    tlvDeser.max_size());
     result = deserializer2.parseData();
     REQUIRE(result == returnvalue::OK);
     REQUIRE(options[0]->getType() == cfdp::TlvType::FILESTORE_RESPONSE);
@@ -151,12 +179,15 @@ TEST_CASE("Metadata PDU", "[cfdp][pdu]") {
     for (size_t invalidFieldLen = 0; invalidFieldLen < 36; invalidFieldLen++) {
       mdBuffer[1] = (invalidFieldLen >> 8) & 0xff;
       mdBuffer[2] = invalidFieldLen & 0xff;
+      if (invalidFieldLen == 17) {
+        volatile uint32_t dummy = 0;
+      }
       result = deserializer2.parseData();
       if (invalidFieldLen == 17) {
-        REQUIRE(info.getOptionsLen() == 0);
+        REQUIRE(deserializer2.getNumberOfParsedOptions() == 0);
       }
       if (invalidFieldLen == 31) {
-        REQUIRE(info.getOptionsLen() == 1);
+        REQUIRE(deserializer2.getNumberOfParsedOptions() == 1);
       }
       // This is the precise length where there are no options or one option
       if (invalidFieldLen != 17 and invalidFieldLen != 31) {
@@ -165,11 +196,25 @@ TEST_CASE("Metadata PDU", "[cfdp][pdu]") {
     }
     mdBuffer[1] = (36 >> 8) & 0xff;
     mdBuffer[2] = 36 & 0xff;
-    info.setOptionsArray(nullptr, std::nullopt, std::nullopt);
+  }
+
+  SECTION("Can not parse options") {
+    MetadataPduCreator serializer(pduConf, info, sourceFileName, destFileName, options.data(),
+                                  options.size());
+    info.setChecksumType(cfdp::ChecksumType::CRC_32C);
+    info.setClosureRequested(true);
+    buffer = mdBuffer.data();
+    sz = 0;
+    serializer.updateDirectiveFieldLen();
+
+    // info.setSourceFileName(sourceFileName);
+    result = serializer.serialize(&buffer, &sz, mdBuffer.size(), SerializeIF::Endianness::NETWORK);
+    REQUIRE(result == returnvalue::OK);
+
+    MetadataPduReader deserializer2(mdBuffer.data(), mdBuffer.size(), info, nullptr, 0);
     REQUIRE(deserializer2.parseData() == cfdp::METADATA_CANT_PARSE_OPTIONS);
-    info.setOptionsArray(options.data(), sizeOfOptions, std::nullopt);
     for (size_t maxSz = 0; maxSz < 46; maxSz++) {
-      MetadataPduReader invalidSzDeser(mdBuffer.data(), maxSz, info);
+      MetadataPduReader invalidSzDeser(mdBuffer.data(), maxSz, info, nullptr, 0);
       if (not invalidSzDeser.isNull()) {
         result = invalidSzDeser.parseData();
         REQUIRE(result == SerializeIF::STREAM_TOO_SHORT);

unittests/cfdp/pdu/testNakPdu.cpp

@@ -17,8 +17,8 @@ TEST_CASE("NAK PDU", "[cfdp][pdu]") {
   EntityId sourceId(WidthInBytes::TWO_BYTES, 1);
   PduConfig pduConf(sourceId, destId, TransmissionMode::ACKNOWLEDGED, seqNum);
 
-  FileSize startOfScope(50);
+  Fss startOfScope(50);
-  FileSize endOfScope(1050);
+  Fss endOfScope(1050);
   NakInfo info(startOfScope, endOfScope);
   SECTION("Serializer") {
     NakPduCreator serializer(pduConf, info);
@@ -40,8 +40,8 @@ TEST_CASE("NAK PDU", "[cfdp][pdu]") {
     REQUIRE(result == returnvalue::OK);
     REQUIRE(scope == 1050);
 
-    NakInfo::SegmentRequest segReq0(cfdp::FileSize(2020), cfdp::FileSize(2520));
+    NakInfo::SegmentRequest segReq0(cfdp::Fss(2020), cfdp::Fss(2520));
-    NakInfo::SegmentRequest segReq1(cfdp::FileSize(2932), cfdp::FileSize(3021));
+    NakInfo::SegmentRequest segReq1(cfdp::Fss(2932), cfdp::Fss(3021));
     // Now add 2 segment requests to NAK info and serialize them as well
     std::array<NakInfo::SegmentRequest, 2> segReqs = {segReq0, segReq1};
     size_t segReqsLen = segReqs.size();
@@ -100,8 +100,8 @@ TEST_CASE("NAK PDU", "[cfdp][pdu]") {
     REQUIRE(info.getStartOfScope().getSize() == 50);
     REQUIRE(info.getEndOfScope().getSize() == 1050);
 
-    NakInfo::SegmentRequest segReq0(cfdp::FileSize(2020), cfdp::FileSize(2520));
+    NakInfo::SegmentRequest segReq0(cfdp::Fss(2020), cfdp::Fss(2520));
-    NakInfo::SegmentRequest segReq1(cfdp::FileSize(2932), cfdp::FileSize(3021));
+    NakInfo::SegmentRequest segReq1(cfdp::Fss(2932), cfdp::Fss(3021));
     // Now add 2 segment requests to NAK info and serialize them as well
     std::array<NakInfo::SegmentRequest, 2> segReqs = {segReq0, segReq1};
     size_t segReqsLen = segReqs.size();

unittests/cfdp/testCfdp.cpp

@@ -2,7 +2,7 @@
 #include <catch2/catch_test_macros.hpp>
 #include <cstring>
 
-#include "fsfw/cfdp/FileSize.h"
+#include "fsfw/cfdp/Fss.h"
 #include "fsfw/cfdp/pdu/FileDirectiveCreator.h"
 #include "fsfw/cfdp/pdu/FileDirectiveReader.h"
 #include "fsfw/globalfunctions/arrayprinter.h"
@@ -79,7 +79,7 @@ TEST_CASE("CFDP Base", "[cfdp]") {
     std::array<uint8_t, 8> fssBuf = {};
     uint8_t* buffer = fssBuf.data();
     size_t size = 0;
-    cfdp::FileSize fss;
+    cfdp::Fss fss;
     REQUIRE(fss.getSize() == 0);
     fss.setFileSize(0x20, false);
     result = fss.serialize(&buffer, &size, fssBuf.size(), SerializeIF::Endianness::MACHINE);