108 lines
4.1 KiB
C++
108 lines
4.1 KiB
C++
#ifndef SERIALIZEADAPTER_H_
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#define SERIALIZEADAPTER_H_
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#include <framework/returnvalues/HasReturnvaluesIF.h>
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#include <framework/serialize/SerializeIF.h>
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#include <framework/serialize/SerializeAdapterInternal.h>
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#include <type_traits>
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/**
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* @brief These adapters provides an interface to use the SerializeIF functions
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* with arbitrary template objects to facilitate and simplify the
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* serialization of classes with different multiple different data types
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* into buffers and vice-versa.
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* @details
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*
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* A report class is converted into a TM buffer. The report class implements a
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* serialize functions and calls the AutoSerializeAdapter::serialize function
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* repeatedly on all object data fields. The getSerializedSize function is
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* implemented by calling the AutoSerializeAdapter::getSerializedSize function
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* repeatedly on all data fields.
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*
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* The AutoSerializeAdapter functions can also be used as an alternative to
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* memcpy to retrieve data out of a buffer directly into a class variable
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* with data type T while being able to specify endianness. The boolean
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* bigEndian specifies whether an endian swap is performed on the data before
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* serialization or deserialization.
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*
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* There are three ways to retrieve data out of a buffer to be used in the FSFW
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* to use regular aligned (big endian) data. Examples:
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*
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* 1. Use the AutoSerializeAdapter::deSerialize function
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* The pointer *buffer will be incremented automatically by the typeSize
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* of the object, so this function can be called on &buffer repeatedly
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* without adjusting pointer position. Set bigEndian parameter to true
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* to perform endian swapping, if necessary
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* @code
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* uint16_t data;
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* int32_t dataLen = sizeof(data);
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* ReturnValue_t result =
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* AutoSerializeAdapter::deSerialize(&data,&buffer,&dataLen,true);
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* @endcode
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*
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* 2. Perform a bitshift operation. Watch for for endianness:
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* @code
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* uint16_t data;
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* data = buffer[targetByte1] << 8 | buffer[targetByte2];
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* data = EndianSwapper::swap(data); //optional, or swap order above
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* @endcode
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*
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* 3. memcpy or std::copy can also be used, but watch out if system
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* endianness is different from required data endianness.
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* Perform endian-swapping if necessary.
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* @code
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* uint16_t data;
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* memcpy(&data,buffer + positionOfTargetByte1,sizeof(data));
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* data = EndianSwapper::swap(data); //optional
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* @endcode
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*
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* When serializing for downlink, the packets are generally serialized assuming
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* big endian data format like seen in TmPacketStored.cpp for example.
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*
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* @ingroup serialize
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*/
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// No type specification necessary here.
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class AutoSerializeAdapter {
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public:
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template<typename T>
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static ReturnValue_t serialize(const T* object, uint8_t** buffer,
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size_t* size, const size_t max_size, bool bigEndian) {
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SerializeAdapter_<T, IsDerivedFrom<T, SerializeIF>::Is> adapter;
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return adapter.serialize(object, buffer, size, max_size, bigEndian);
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}
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template<typename T>
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static size_t getSerializedSize(const T* object) {
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SerializeAdapter_<T, IsDerivedFrom<T, SerializeIF>::Is> adapter;
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return adapter.getSerializedSize(object);
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}
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template<typename T>
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static ReturnValue_t deSerialize(T* object, const uint8_t** buffer,
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ssize_t* size, bool bigEndian) {
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SerializeAdapter_<T, IsDerivedFrom<T, SerializeIF>::Is> adapter;
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return adapter.deSerialize(object, buffer, size, bigEndian);
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}
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};
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template<typename T>
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class SerializeAdapter {
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public:
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static ReturnValue_t serialize(const T* object, uint8_t** buffer,
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size_t* size, const size_t max_size, bool bigEndian) {
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SerializeAdapter_<T, IsDerivedFrom<T, SerializeIF>::Is> adapter;
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return adapter.serialize(object, buffer, size, max_size, bigEndian);
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}
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static uint32_t getSerializedSize(const T* object) {
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SerializeAdapter_<T, IsDerivedFrom<T, SerializeIF>::Is> adapter;
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return adapter.getSerializedSize(object);
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}
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static ReturnValue_t deSerialize(T* object, const uint8_t** buffer,
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ssize_t* size, bool bigEndian) {
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SerializeAdapter_<T, IsDerivedFrom<T, SerializeIF>::Is> adapter;
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return adapter.deSerialize(object, buffer, size, bigEndian);
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}
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};
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#endif /* SERIALIZEADAPTER_H_ */
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