#include "RegisterField.h"

/*************************************************************************************************/
quint32 RegisterField::getBitPosition()
{
	auto bitPosition = 0U;
	auto mask = _mask;
	while(true)
	{
		if((mask & 0x01) == 0x01)
		{
			break;
		}

		bitPosition++;
		mask = mask >> 1;
	}

	return bitPosition;
}

/*************************************************************************************************/
quint32 RegisterField::getBitLength()
{
	auto bitlength = 0U;
	auto mask = _mask >> getBitPosition();
	while(true)
	{
		if((mask & 0x01) != 0x01)
		{
			break;
		}

		bitlength++;
		mask = mask >> 1;
	}

	return bitlength;
}

/*************************************************************************************************/
RegisterField::RegisterField(quint32 mask, bool isSigned)
{
	_mask = mask;
	_isSigned = isSigned;
}

/*************************************************************************************************/
void RegisterField::update(quint32 value)
{
	if(_value == value)
	{
		return;
	}
	_value = value;

	quint32 temp = 0;
	temp = (_value << getBitPosition()) & _mask;

	emit fieldUpdated(_value, ~_mask);
}

/*************************************************************************************************/
quint32 RegisterField::getRawValue()
{
	return _value;
}

/*************************************************************************************************/
void RegisterField::ExtractValue(quint32 value)
{
	auto temp = (value >> getBitPosition()) & (_mask >> getBitPosition());
	if(_isSigned && ((temp >> (getBitLength() - 1)) & 0x01) == 0x01)
	{
		temp |= (~(_mask >> getBitPosition()));
	}

	_value = temp;
}