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Merge pull request 'Implements #192' (#193) from gaisser/fsfw:gaisser_serialize_c11_update into master

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Reviewed-on: fsfw/fsfw#193
This commit is contained in:
Robin Müller 2020-09-10 15:13:54 +02:00
commit db2a31aef4
3 changed files with 82 additions and 64 deletions
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41
container/IsDerivedFrom.h
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@ -1,41 +0,0 @@
#ifndef ISDERIVEDFROM_H_
#define ISDERIVEDFROM_H_
template<typename D, typename B>
class IsDerivedFrom {
class No {
};
class Yes {
No no[3];
};
static Yes Test(B*); // declared, but not defined
static No Test(... ); // declared, but not defined
public:
enum {
Is = sizeof(Test(static_cast<D*>(0))) == sizeof(Yes)
};
};
template<typename, typename>
struct is_same {
static bool const value = false;
};
template<typename A>
struct is_same<A, A> {
static bool const value = true;
};
template<bool C, typename T = void>
struct enable_if {
typedef T type;
};
template<typename T>
struct enable_if<false, T> { };
#endif /* ISDERIVEDFROM_H_ */

103
serialize/SerializeAdapter.h
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@ -1,11 +1,11 @@
#ifndef SERIALIZEADAPTER_H_
#define SERIALIZEADAPTER_H_
#ifndef _FSFW_SERIALIZE_SERIALIZEADAPTER_H_
#define _FSFW_SERIALIZE_SERIALIZEADAPTER_H_
#include "../container/IsDerivedFrom.h"
#include "../returnvalues/HasReturnvaluesIF.h"
#include "EndianConverter.h"
#include "SerializeIF.h"
#include <string.h>
#include <cstddef>
#include <type_traits>
/**
* \ingroup serialize
@ -13,36 +13,91 @@
class SerializeAdapter {
public:
/***
* This function can be used to serialize a trivial copy-able type or a child of SerializeIF.
* The right template to be called is determined in the function itself.
* For objects of non trivial copy-able type this function is almost never called by the user directly.
* Instead helpers for specific types like SerialArrayListAdapter or SerialLinkedListAdapter is the right choice here.
*
* @param[in] object Object to serialize, the used type is deduced from this pointer
* @param[in/out] buffer Buffer to serialize into. Will be moved by the function.
* @param[in/out] size Size of current written buffer. Will be incremented by the function.
* @param[in] maxSize Max size of Buffer
* @param[in] streamEndianness Endianness of serialized element as in according to SerializeIF::Endianness
* @return
* - @c BUFFER_TOO_SHORT The given buffer in is too short
* - @c RETURN_FAILED Generic Error
* - @c RETURN_OK Successful serialization
*/
template<typename T>
static ReturnValue_t serialize(const T *object, uint8_t **buffer,
size_t *size, size_t maxSize, SerializeIF::Endianness streamEndianness) {
InternalSerializeAdapter<T, IsDerivedFrom<T, SerializeIF>::Is> adapter;
size_t *size, size_t maxSize,
SerializeIF::Endianness streamEndianness) {
InternalSerializeAdapter<T, std::is_base_of<SerializeIF, T>::value> adapter;
return adapter.serialize(object, buffer, size, maxSize,
streamEndianness);
}
/**
* Function to return the serialized size of the object in the pointer.
* May be a trivially copy-able object or a Child of SerializeIF
*
* @param object Pointer to Object
* @return Serialized size of object
*/
template<typename T>
static uint32_t getSerializedSize(const T *object) {
InternalSerializeAdapter<T, IsDerivedFrom<T, SerializeIF>::Is> adapter;
static size_t getSerializedSize(const T *object){
InternalSerializeAdapter<T, std::is_base_of<SerializeIF, T>::value> adapter;
return adapter.getSerializedSize(object);
}
/**
* @brief
* Deserializes a object from a given buffer of given size.
* Object Must be trivially copy-able or a child of SerializeIF.
*
* @details
* Buffer will be moved to the current read location. Size will be decreased by the function.
*
* @param[in/out] buffer Buffer to deSerialize from. Will be moved by the function.
* @param[in/out] size Remaining size of the buffer to read from. Will be decreased by function.
* @param[in] streamEndianness Endianness as in according to SerializeIF::Endianness
* @return
* - @c STREAM_TOO_SHORT The input stream is too short to deSerialize the object
* - @c TOO_MANY_ELEMENTS The buffer has more inputs than expected
* - @c RETURN_FAILED Generic Error
* - @c RETURN_OK Successful deserialization
*/
template<typename T>
static ReturnValue_t deSerialize(T *object, const uint8_t **buffer,
size_t *size, SerializeIF::Endianness streamEndianness) {
InternalSerializeAdapter<T, IsDerivedFrom<T, SerializeIF>::Is> adapter;
InternalSerializeAdapter<T, std::is_base_of<SerializeIF, T>::value> adapter;
return adapter.deSerialize(object, buffer, size, streamEndianness);
}
private:
template<typename T, int>
class InternalSerializeAdapter {
/**
* Internal template to deduce the right function calls at compile time
*/
template<typename T, bool> class InternalSerializeAdapter;
/**
* Template to be used if T is not a child of SerializeIF
*
* @tparam T T must be trivially_copyable
*/
template<typename T>
class InternalSerializeAdapter<T, false> {
static_assert (std::is_trivially_copyable<T>::value,
"If a type needs to be serialized it must be a child of SerializeIF or trivially copy-able");
public:
static ReturnValue_t serialize(const T *object, uint8_t **buffer,
size_t *size, size_t max_size, SerializeIF::Endianness streamEndianness) {
size_t *size, size_t max_size,
SerializeIF::Endianness streamEndianness) {
size_t ignoredSize = 0;
if (size == NULL) {
if (size == nullptr) {
size = &ignoredSize;
}
//TODO check integer overflow of *size
if (sizeof(T) + *size <= max_size) {
//Check remaining size is large enough and check integer overflow of *size
size_t newSize = sizeof(T) + *size;
if ((newSize <= max_size) and (newSize > *size)) {
T tmp;
switch (streamEndianness) {
case SerializeIF::Endianness::BIG:
@ -94,22 +149,26 @@ private:
uint32_t getSerializedSize(const T *object) {
return sizeof(T);
}
};
/**
* Template for objects that inherit from SerializeIF
*
* @tparam T A child of SerializeIF
*/
template<typename T>
class InternalSerializeAdapter<T, 1> {
class InternalSerializeAdapter<T, true> {
public:
ReturnValue_t serialize(const T *object, uint8_t **buffer,
size_t *size, size_t max_size,
ReturnValue_t serialize(const T *object, uint8_t **buffer, size_t *size,
size_t max_size,
SerializeIF::Endianness streamEndianness) const {
size_t ignoredSize = 0;
if (size == NULL) {
if (size == nullptr) {
size = &ignoredSize;
}
return object->serialize(buffer, size, max_size, streamEndianness);
}
uint32_t getSerializedSize(const T *object) const {
size_t getSerializedSize(const T *object) const {
return object->getSerializedSize();
}
@ -120,4 +179,4 @@ private:
};
};
#endif /* SERIALIZEADAPTER_H_ */
#endif /* _FSFW_SERIALIZE_SERIALIZEADAPTER_H_ */

2
serialize/SerializeIF.h
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@ -43,7 +43,7 @@ public:
* @param[in] maxSize The size of the buffer that is allowed to be used for serialize.
* @param[in] streamEndianness Endianness of the serialized data according to SerializeIF::Endianness
* @return
* - @¢ BUFFER_TOO_SHORT The given buffer in is too short
* - @c BUFFER_TOO_SHORT The given buffer in is too short
* - @c RETURN_FAILED Generic error
* - @c RETURN_OK Successful serialization
*/