implemented metadata handler

src/fsfw/cfdp/VarLenFields.h

@@ -74,6 +74,7 @@ struct TransactionSeqNum : public VarLenField {
 };
 
 struct TransactionId {
+  TransactionId() = default;
   TransactionId(EntityId entityId, TransactionSeqNum seqNum)
       : entityId(std::move(entityId)), seqNum(std::move(seqNum)) {}
 

src/fsfw/cfdp/handler/DestHandler.cpp

@@ -3,14 +3,19 @@
 #include <utility>
 
 #include "fsfw/cfdp/pdu/HeaderReader.h"
-#include "fsfw/cfdp/pdu/MetadataPduReader.h"
 #include "fsfw/objectmanager.h"
 #include "fsfw/serviceinterface.h"
 
 using namespace returnvalue;
 
 cfdp::DestHandler::DestHandler(DestHandlerParams params, FsfwParams fsfwParams)
-    : dp(std::move(params)), fp(fsfwParams), tlvVec(params.maxTlvsInOnePdu) {}
+    : tlvVec(params.maxTlvsInOnePdu),
+      userTlvVec(params.maxTlvsInOnePdu),
+      dp(std::move(params)),
+      fp(fsfwParams),
+      tp(params.maxFilenameLen) {
+  tp.pduConf.direction = cfdp::Direction::TOWARDS_SENDER;
+}
 
 ReturnValue_t cfdp::DestHandler::performStateMachine() {
   switch (step) {
@@ -73,10 +78,9 @@ ReturnValue_t cfdp::DestHandler::handleMetadataPdu(const PacketInfo& info) {
     // TODO: This is not a CFDP error. Event and/or warning?
     return constAccessorPair.first;
   }
-  cfdp::FileSize fileSize;
   cfdp::StringLv sourceFileName;
   cfdp::StringLv destFileName;
-  MetadataInfo metadataInfo(fileSize, sourceFileName, destFileName);
+  MetadataInfo metadataInfo(tp.fileSize, sourceFileName, destFileName);
   cfdp::Tlv* tlvArrayAsPtr = tlvVec.data();
   metadataInfo.setOptionsArray(&tlvArrayAsPtr, std::nullopt, tlvVec.size());
   MetadataPduReader reader(constAccessorPair.second.data(), constAccessorPair.second.size(),
@@ -89,7 +93,7 @@ ReturnValue_t cfdp::DestHandler::handleMetadataPdu(const PacketInfo& info) {
     return handleMetadataParseError(constAccessorPair.second.data(),
                                     constAccessorPair.second.size());
   }
-  return result;
+  return startTransaction(reader, metadataInfo);
 }
 
 ReturnValue_t cfdp::DestHandler::handleMetadataParseError(const uint8_t* rawData, size_t maxSize) {
@@ -126,3 +130,44 @@ ReturnValue_t cfdp::DestHandler::handleMetadataParseError(const uint8_t* rawData
   // TODO: Appropriate returnvalue?
   return returnvalue::FAILED;
 }
+
+ReturnValue_t cfdp::DestHandler::startTransaction(MetadataPduReader& reader, MetadataInfo& info) {
+  if (cfdpState != CfdpStates::IDLE) {
+    // According to standard, discard metadata PDU if we are busy
+    return returnvalue::OK;
+  }
+  step = TransactionStep::TRANSACTION_START;
+  if (reader.getTransmissionMode() == TransmissionModes::UNACKNOWLEDGED) {
+    cfdpState = CfdpStates::BUSY_CLASS_1_NACKED;
+  } else if (reader.getTransmissionMode() == TransmissionModes::ACKNOWLEDGED) {
+    cfdpState = CfdpStates::BUSY_CLASS_2_ACKED;
+  }
+  tp.checksumType = info.getChecksumType();
+  tp.closureRequested = info.isClosureRequested();
+  size_t sourceNameSize = 0;
+  const uint8_t* sourceNamePtr = info.getSourceFileName().getValue(&sourceNameSize);
+  if (sourceNameSize > tp.sourceName.size()) {
+    // TODO: Warning, event etc.
+    return FAILED;
+  }
+  std::memcpy(tp.sourceName.data(), sourceNamePtr, sourceNameSize);
+  tp.sourceName[sourceNameSize] = '\0';
+  size_t destNameSize = 0;
+  const uint8_t* destNamePtr = info.getDestFileName().getValue(&destNameSize);
+  if (destNameSize > tp.destName.size()) {
+    // TODO: Warning, event etc.
+    return FAILED;
+  }
+  std::memcpy(tp.destName.data(), destNamePtr, destNameSize);
+  tp.destName[destNameSize] = '\0';
+  reader.fillConfig(tp.pduConf);
+  tp.pduConf.direction = Direction::TOWARDS_SENDER;
+  tp.transactionId.entityId = tp.pduConf.sourceId;
+  tp.transactionId.seqNum = tp.pduConf.seqNum;
+  if (not dp.remoteCfgTable.getRemoteCfg(tp.pduConf.destId, &tp.remoteCfg)) {
+    // TODO: Warning, event etc.
+    return FAILED;
+  }
+  step = TransactionStep::RECEIVING_FILE_DATA_PDUS;
+  return OK;
+}

src/fsfw/cfdp/handler/DestHandler.h

@@ -7,7 +7,9 @@
 
 #include "RemoteConfigTableIF.h"
 #include "UserBase.h"
+#include "defs.h"
 #include "fsfw/cfdp/handler/mib.h"
+#include "fsfw/cfdp/pdu/MetadataPduReader.h"
 #include "fsfw/cfdp/pdu/PduConfig.h"
 #include "fsfw/container/DynamicFIFO.h"
 #include "fsfw/storagemanager/StorageManagerIF.h"
@@ -28,7 +30,7 @@ struct PacketInfo {
 
 struct DestHandlerParams {
   DestHandlerParams(LocalEntityCfg cfg, UserBase& user, RemoteConfigTableIF& remoteCfgTable,
-                    etl::ilist<PacketInfo>& packetList, uint8_t maxTlvsInOnePdu)
+                    etl::ilist<PacketInfo>& packetList)
       : cfg(std::move(cfg)),
         user(user),
         remoteCfgTable(remoteCfgTable),
@@ -39,7 +41,8 @@ struct DestHandlerParams {
   RemoteConfigTableIF& remoteCfgTable;
 
   etl::ilist<PacketInfo>& packetListRef;
-  uint8_t maxTlvsInOnePdu;
+  uint8_t maxTlvsInOnePdu = 10;
+  size_t maxFilenameLen = 255;
 };
 
 struct FsfwParams {
@@ -67,8 +70,6 @@ class DestHandler {
   ReturnValue_t handleMetadataParseError(const uint8_t* rawData, size_t maxSize);
 
  private:
-  DestHandlerParams dp;
-  FsfwParams fp;
   enum class TransactionStep {
     IDLE = 0,
     TRANSACTION_START = 1,
@@ -77,8 +78,29 @@ class DestHandler {
     TRANSFER_COMPLETION = 4,
     SENDING_FINISHED_PDU = 5
   };
+  struct TransactionParams {
+    explicit TransactionParams(size_t maxFileNameLen)
+        : sourceName(maxFileNameLen), destName(maxFileNameLen) {}
+
+    ChecksumType checksumType = ChecksumType::NULL_CHECKSUM;
+    bool closureRequested{};
+    std::vector<char> sourceName;
+    std::vector<char> destName;
+    cfdp::FileSize fileSize;
+    TransactionId transactionId;
+    PduConfig pduConf;
+    RemoteEntityCfg* remoteCfg;
+  };
+
   TransactionStep step = TransactionStep::IDLE;
+  CfdpStates cfdpState = CfdpStates::IDLE;
   std::vector<cfdp::Tlv> tlvVec;
+  std::vector<cfdp::Tlv> userTlvVec;
+  DestHandlerParams dp;
+  FsfwParams fp;
+  TransactionParams tp;
+
+  ReturnValue_t startTransaction(MetadataPduReader& reader, MetadataInfo& info);
 };
 
 }  // namespace cfdp

src/fsfw/cfdp/handler/defs.h

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

src/fsfw/cfdp/pdu/HeaderReader.cpp

@@ -139,3 +139,13 @@ bool HeaderReader::isNull() const {
 }
 
 HeaderReader::operator bool() const { return not isNull(); }
+
+void HeaderReader::fillConfig(PduConfig &cfg) const {
+  cfg.largeFile = getLargeFileFlag();
+  cfg.crcFlag = getCrcFlag();
+  cfg.mode = getTransmissionMode();
+  cfg.direction = getDirection();
+  getTransactionSeqNum(cfg.seqNum);
+  getSourceId(cfg.sourceId);
+  getDestId(cfg.destId);
+}

src/fsfw/cfdp/pdu/HeaderReader.h

@@ -45,6 +45,12 @@ class HeaderReader : public RedirectableDataPointerIF, public PduHeaderIF {
   explicit operator bool() const;
   [[nodiscard]] bool isNull() const;
 
+  /**
+   * Fill the provided PDU configuration from the fields detected by this reader.
+   * @param cfg
+   */
+  void fillConfig(PduConfig& cfg) const;
+
   [[nodiscard]] virtual size_t getHeaderSize() const;
 
   [[nodiscard]] size_t getPduDataFieldLen() const override;

src/fsfw/cfdp/pdu/PduConfig.h

@@ -6,16 +6,18 @@
 
 class PduConfig {
  public:
+  PduConfig() = default;
   PduConfig(cfdp::EntityId sourceId, cfdp::EntityId destId, cfdp::TransmissionModes mode,
             cfdp::TransactionSeqNum seqNum, bool crcFlag = false, bool largeFile = false,
             cfdp::Direction direction = cfdp::Direction::TOWARDS_RECEIVER);
-  cfdp::TransmissionModes mode;
+
+  cfdp::TransmissionModes mode = cfdp::TransmissionModes::ACKNOWLEDGED;
   cfdp::TransactionSeqNum seqNum;
   cfdp::EntityId sourceId;
   cfdp::EntityId destId;
-  bool crcFlag;
-  bool largeFile;
-  cfdp::Direction direction;
+  bool crcFlag = false;
+  bool largeFile = false;
+  cfdp::Direction direction = cfdp::Direction::TOWARDS_RECEIVER;
 };
 
 #endif /* FSFW_SRC_FSFW_CFDP_PDU_PDUCONFIG_H_ */