public static double BytesToDoubleCalc(byte[] buffer, int offset, bool isLittleEndian)
{
byte[] subBuffer = new byte[8];
Array.Copy(buffer, offset, subBuffer, 0, 8);
if (BytesToInt64(subBuffer, 0, true) == 0)
{
return(0);
}
if (!isLittleEndian)
{
subBuffer = BitUtil.ReverseBuffer(subBuffer);
}
byte tmp = subBuffer[0];
byte sign = (byte)(tmp >> 7);
int exp_upper7 = tmp << 4;
tmp = subBuffer[1];
int exp_lower4 = tmp >> 4;
int exponent = exp_upper7 | exp_lower4;
int _exponent = exponent - 1023;
int bytepos = 1;
int bitpos = 3;
string binary = (String)BitUtil.ReadBits(subBuffer, ref bytepos, ref bitpos, 52, true);
if (exponent == 2047)
{
if (StringMath.are_equal(binary, "0"))
{
if (sign == 1)
{
return(double.NegativeInfinity);
}
else
{
return(double.PositiveInfinity);
}
}
else
{
return(double.NaN);
}
}
else
{
binary = StringMath.beautify_number("1." + binary);
double dec;
dec = Convert.ToDouble(BaseConverter.Convert(binary, 2, 10, 0, 31));
dec *= 1 - (2 * sign);
dec *= Math.Pow(2, _exponent);
return(dec);
}
}
public static string GetBaseFromValue(string value, int numberBase, int precision)
{
bool isNegative = false;
if (StringMath.is_greater("0", value))
{
value = StringMath.switch_sign(value);
isNegative = true;
}
string baseNumber = "";
string integer_part = StringMath.get_integer_part(value);
string fraction_part = "0." + StringMath.get_fraction_part(value);
string timesForNextDigit = integer_part;
string remainderForCurrentDigit;
char c;
do
{
remainderForCurrentDigit = StringMath.remainder(timesForNextDigit, numberBase.ToString());
timesForNextDigit = StringMath.divide(new List <string> {
timesForNextDigit, numberBase.ToString()
}, 0);
c = GetBaseDigitForValue(System.Convert.ToInt32(remainderForCurrentDigit));
baseNumber = c + baseNumber;
} while (!StringMath.are_equal(timesForNextDigit, "0"));
int _precision = 0;
for (int e = 0; true; e--)
{
if (_precision == precision)
{
break;
}
if (StringMath.are_equal(fraction_part, "0"))
{
break;
}
else if (e == 0)
{
baseNumber += ".";
}
fraction_part = StringMath.multiply(new List <string> {
fraction_part, numberBase.ToString()
});
string digitValue = StringMath.get_integer_part(fraction_part);
if (StringMath.is_greater_or_equal(digitValue, "1"))
{
fraction_part = StringMath.subtract(new List <string> {
fraction_part, digitValue
});
char digit = GetBaseDigitForValue(System.Convert.ToInt32(digitValue));
baseNumber += digit;
}
else
{
baseNumber += "0";
}
_precision++;
}
if (isNegative)
{
baseNumber = StringMath.switch_sign(baseNumber);
}
return(StringMath.beautify_number(baseNumber));
}