56 lines
1.4 KiB
C++
56 lines
1.4 KiB
C++
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#ifndef BYTE_BUFFER_HPP_7NOEQO4F
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#define BYTE_BUFFER_HPP_7NOEQO4F
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#include <cstdint>
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#include <type_traits>
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#include <vector>
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namespace vanetza
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{
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typedef std::vector<uint8_t> ByteBuffer;
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/**
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* Cast byte buffer to a POD object
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* \param buffer byte buffer containing requested object
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* \return pointer to object or nullptr if cast is impossible
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*/
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template<typename MASK>
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MASK* buffer_cast(ByteBuffer& buffer)
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{
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static_assert(std::is_standard_layout<MASK>::value, "MASK has to be standard layout type");
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static_assert(std::is_trivially_copyable<MASK>::value, "MASK has to be trivially copyable");
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static_assert(std::is_object<MASK>::value, "MASK has to be an object");
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MASK* mask = nullptr;
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if (sizeof(MASK) <= buffer.size()) {
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mask = reinterpret_cast<MASK*>(&buffer[0]);
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}
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return mask;
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}
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template<typename MASK>
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const MASK* buffer_cast(const ByteBuffer& buffer)
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{
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// const_cast is safe, const qualifier is added to return type
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return buffer_cast<MASK>(const_cast<ByteBuffer&>(buffer));
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}
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/**
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* Create byte buffer with copy of POD object
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* \param obj POD object
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* \return ByteBuffer object with copy
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*/
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template<class T>
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ByteBuffer buffer_copy(const T& object)
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{
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static_assert(std::is_standard_layout<T>::value, "T has to be standard layout type");
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auto ptr = reinterpret_cast<const uint8_t*>(&object);
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return ByteBuffer(ptr, ptr + sizeof(T));
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}
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} // namespace vanetza
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#endif /* BYTE_BUFFER_HPP_7NOEQO4F */
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