fsfw/src/fsfw/tcdistribution/TcPacketCheckPUS.cpp

#include "fsfw/tcdistribution/TcPacketCheckPUS.h"

#include "fsfw/globalfunctions/CRC.h"
#include "fsfw/serviceinterface/ServiceInterface.h"
#include "fsfw/storagemanager/StorageManagerIF.h"
#include "fsfw/tmtcpacket/pus/tc/TcPacketPusBase.h"
#include "fsfw/tmtcpacket/pus/tc/TcPacketStoredBase.h"
#include "fsfw/tmtcpacket/pus/tc/TcPacketStoredPus.h"
#include "fsfw/tmtcservices/VerificationCodes.h"

TcPacketCheckPUS::TcPacketCheckPUS(uint16_t setApid) : apid(setApid) {}

ReturnValue_t TcPacketCheckPUS::checkPacket(SpacePacketBase* currentPacket) {
  TcPacketStoredBase* storedPacket = dynamic_cast<TcPacketStoredBase*>(currentPacket);
  TcPacketPusBase* tcPacketBase = dynamic_cast<TcPacketPusBase*>(currentPacket);
  if (tcPacketBase == nullptr or storedPacket == nullptr) {
    return returnvalue::FAILED;
  }
  uint16_t calculated_crc =
      CRC::crc16ccitt(tcPacketBase->getWholeData(), tcPacketBase->getFullSize());
  if (calculated_crc != 0) {
    return INCORRECT_CHECKSUM;
  }
  bool condition = (not tcPacketBase->hasSecondaryHeader()) or
                   (tcPacketBase->getPacketVersionNumber() != CCSDS_VERSION_NUMBER) or
                   (not tcPacketBase->isTelecommand());
  if (condition) {
    return INCORRECT_PRIMARY_HEADER;
  }
  if (tcPacketBase->getAPID() != this->apid) return ILLEGAL_APID;

  if (not storedPacket->isSizeCorrect()) {
    return INCOMPLETE_PACKET;
  }

  condition = (tcPacketBase->getSecondaryHeaderFlag() != CCSDS_SECONDARY_HEADER_FLAG) ||
              (tcPacketBase->getPusVersionNumber() != PUS_VERSION_NUMBER);
  if (condition) {
    return INCORRECT_SECONDARY_HEADER;
  }
  return returnvalue::OK;
}

uint16_t TcPacketCheckPUS::getApid() const { return apid; }