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/*
* TransactionBufferReader.h
*
* Created on: 7 Jul 2016
* Author: David
*/
#ifndef SRC_DUETNG_TRANSACTIONBUFFERREADER_H_
#define SRC_DUETNG_TRANSACTIONBUFFERREADER_H_
#include "Core.h"
#include "TransactionBuffer.h"
// Helper class to extract values in sequence from a TransactionBuffer
class TransactionBufferReader
{
public:
TransactionBufferReader(TransactionBuffer& tb);
// Read a value of a primitive type
template<class T> T GetPrimitive();
// Read an array of primitive types
template<class T> void GetArray(T * arr, size_t numElems);
// Read a string
const char* GetString(size_t fieldWidth);
// Test whether we ran off the end
bool IsOk() const { return ok; }
private:
TransactionBuffer& buf;
uint32_t offset;
bool ok;
};
template <class T> T TransactionBufferReader::GetPrimitive()
{
if (ok)
{
if (offset + sizeof(T) <= buf.GetLength())
{
T rslt = *reinterpret_cast<const T*>(buf.GetData() + offset);
offset += sizeof(T);
return rslt;
}
ok = false;
}
return static_cast<T>(0);
}
template<class T> void TransactionBufferReader::GetArray(T * arr, size_t numElems)
{
for (size_t i = 0; i < numElems; ++i)
{
arr[i] = GetPrimitive<T>();
}
}
#endif /* SRC_DUETNG_TRANSACTIONBUFFERREADER_H_ */
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