91 lines
2.2 KiB
C++
91 lines
2.2 KiB
C++
#ifndef ENDIANSWAPPER_H_
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#define ENDIANSWAPPER_H_
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#include <framework/osal/Endiness.h>
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#include <cstring>
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#include <iostream>
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/**
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* @brief Can be used to swap endianness of data
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* into big endian
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*/
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class EndianSwapper {
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private:
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EndianSwapper() {};
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public:
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/**
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* Swap the endianness of a variable with arbitrary type
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* @tparam T Type of variable
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* @param in variable
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* @return Variable with swapped endianness
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*/
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template<typename T>
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static T swap(T in) {
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#ifndef BYTE_ORDER_SYSTEM
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#error BYTE_ORDER_SYSTEM not defined
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#elif BYTE_ORDER_SYSTEM == LITTLE_ENDIAN
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T tmp;
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uint8_t *pointerOut = (uint8_t *) &tmp;
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uint8_t *pointerIn = (uint8_t *) ∈
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for (uint8_t count = 0; count < sizeof(T); count++) {
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pointerOut[sizeof(T) - count - 1] = pointerIn[count];
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}
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return tmp;
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#elif BYTE_ORDER_SYSTEM == BIG_ENDIAN
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return in;
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#else
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#error Unknown Byte Order
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#endif
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}
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/**
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* Swap the endianness of a buffer.
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* @param out
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* @param in
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* @param size
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*/
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static void swap(uint8_t* out, const uint8_t* in, size_t size) {
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#ifndef BYTE_ORDER_SYSTEM
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#error BYTE_ORDER_SYSTEM not defined
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#elif BYTE_ORDER_SYSTEM == LITTLE_ENDIAN
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for (uint8_t count = 0; count < size; count++) {
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out[size - count - 1] = in[count];
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}
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return;
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#elif BYTE_ORDER_SYSTEM == BIG_ENDIAN
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memcpy(out, in, size);
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return;
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#endif
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}
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/**
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* Swap endianness of buffer entries
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* Template argument specifies buffer type. The number of entries
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* (not the buffer size!) must be supplied
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* @param out
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* @param in
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* @param size Number of buffer entries (not size of buffer in bytes!)
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*/
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template<typename T>
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static void swap(T * out, const T * in, uint32_t entries) {
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#ifndef BYTE_ORDER_SYSTEM
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#error BYTE_ORDER_SYSTEM not defined
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#elif BYTE_ORDER_SYSTEM == LITTLE_ENDIAN
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const uint8_t * in_buffer = reinterpret_cast<const uint8_t *>(in);
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uint8_t * out_buffer = reinterpret_cast<uint8_t *>(out);
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for (uint8_t count = 0; count < entries; count++) {
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for(uint8_t i = 0; i < sizeof(T);i++) {
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out_buffer[sizeof(T)* (count + 1) - i - 1] =
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in_buffer[count * sizeof(T) + i];
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}
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}
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return;
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#elif BYTE_ORDER_SYSTEM == BIG_ENDIAN
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memcpy(out, in, size*sizeof(T));
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return;
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#endif
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}
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};
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#endif /* ENDIANSWAPPER_H_ */
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