fsfw/tmtcpacket/pus/TcPacketStored.h
2020-08-13 20:53:35 +02:00

106 lines
4.1 KiB
C++

#ifndef TCPACKETSTORED_H_
#define TCPACKETSTORED_H_
#include "../../storagemanager/StorageManagerIF.h"
#include "TcPacketBase.h"
/**
* This class generates a ECSS PUS Telecommand packet within a given
* intermediate storage.
* As most packets are passed between tasks with the help of a storage
* anyway, it seems logical to create a Packet-In-Storage access class
* which saves the user almost all storage handling operation.
* Packets can both be newly created with the class and be "linked" to
* packets in a store with the help of a storeAddress.
* @ingroup tmtcpackets
*/
class TcPacketStored : public TcPacketBase {
private:
/**
* This is a pointer to the store all instances of the class use.
* If the store is not yet set (i.e. \c store is NULL), every constructor
* call tries to set it and throws an error message in case of failures.
* The default store is objects::TC_STORE.
*/
static StorageManagerIF* store;
/**
* The address where the packet data of the object instance is stored.
*/
store_address_t storeAddress;
/**
* A helper method to check if a store is assigned to the class.
* If not, the method tries to retrieve the store from the global
* ObjectManager.
* @return @li \c true if the store is linked or could be created.
* @li \c false otherwise.
*/
bool checkAndSetStore();
public:
/**
* This is a default constructor which does not set the data pointer.
* However, it does try to set the packet store.
*/
TcPacketStored();
/**
* With this constructor, the class instance is linked to an existing
* packet in the packet store.
* The packet content is neither checked nor changed with this call. If
* the packet could not be found, the data pointer is set to NULL.
*/
TcPacketStored( store_address_t setAddress );
/**
* With this constructor, new space is allocated in the packet store and
* a new PUS Telecommand Packet is created there.
* Packet Application Data passed in data is copied into the packet.
* @param apid Sets the packet's APID field.
* @param ack Set's the packet's Ack field,
* which specifies number and size of verification packets returned
* for this command.
* @param service Sets the packet's Service ID field.
* This specifies the destination service.
* @param subservice Sets the packet's Service Subtype field.
* This specifies the destination sub-service.
* @param sequence_count Sets the packet's Source Sequence Count field.
* @param data The data to be copied to the Application Data Field.
* @param size The amount of data to be copied.
*/
TcPacketStored( uint16_t apid, uint8_t ack, uint8_t service, uint8_t subservice, uint8_t sequence_count = 0, const uint8_t* data = NULL, uint32_t size = 0 );
/**
* Another constructor to create a TcPacket from a raw packet stream.
* Takes the data and adds it unchecked to the TcStore.
* @param data Pointer to the complete TC Space Packet.
* @param Size size of the packet.
*/
TcPacketStored( const uint8_t* data, uint32_t size);
/**
* This is a getter for the current store address of the packet.
* @return The current store address. The (raw) value is \c StorageManagerIF::INVALID_ADDRESS if
* the packet is not linked.
*/
store_address_t getStoreAddress();
/**
* With this call, the packet is deleted.
* It removes itself from the store and sets its data pointer to NULL.
* @return returncode from deleting the data.
*/
ReturnValue_t deletePacket();
/**
* With this call, a packet can be linked to another store. This is useful
* if the packet is a class member and used for more than one packet.
* @param setAddress The new packet id to link to.
*/
void setStoreAddress( store_address_t setAddress );
/**
* This method performs a size check.
* It reads the stored size and compares it with the size entered in the
* packet header. This class is the optimal place for such a check as it
* has access to both the header data and the store.
* @return true if size is correct, false if packet is not registered in
* store or size is incorrect.
*/
bool isSizeCorrect();
};
#endif /* TCPACKETSTORED_H_ */