static private void SetFromString(BigNumber atm, String value, bool isStrainghtDigitsOnly = false)
{
SetZero(atm);
int p = 0;
sbyte sign = 1;
int exponent = 0;
if (isStrainghtDigitsOnly == false)
{
value = value.Trim(); // trim whitespace
value = value.ToLower(); // convert to lower
//value = UtilityHandler.ToLowerFast(value);
int cp = value.IndexOf("0x"); // hexadezimalnumber
if (cp >= 0)
{
value = value.Substring(cp + 2, value.Length - (cp + 2));
BigNumber.SetFromHexString(atm, value);
return;
}
cp = value.IndexOf("%"); // binary format number
if (cp >= 0)
{
value = value.Substring(cp + 1, value.Length - (cp + 1));
BigNumber.SetFromBinaryString(atm, value);
return;
}
cp = value.IndexOf("e");
if (cp > 0) // e cannot be leading
{
String ex = value.Substring(cp + 1, value.Length - (cp + 1));
exponent = Convert.ToInt32(ex);
value = value.Substring(0, cp);
}
}
if (value.Contains("+"))
{
value = value.Replace("+", ""); // remove optional '+' character
}
else if (value.Contains("-"))
{
sign = -1;
value = value.Replace("-", "");
}
value = value.Replace(",", ".");
int j = value.IndexOf(".");
if (j == -1)
{
value = value + '.';
j = value.IndexOf(".");
}
if (j > 0)
{
exponent += j;
value = value.Replace(".", "");
}
int i = value.Length;
atm.dataLength = i;
if ((i % 2) != 0)
{
value = value + '0';
}
j = value.Length >> 1;
if (value.Length > atm.mantissa.Length)
{
BigNumber.Expand(atm, atm.dataLength + 28);
}
byte ch = 0;
int zflag = 1;
for (i = 0, p = 0; i < j; i++)
{
ch = (byte)(value[p++] - '0');
if ((ch = (byte)((byte)(10 * ch) + (byte)(value[p++] - '0'))) != 0)
{
zflag = 0;
}
if (((int)ch & 0xFF) >= 100)
{
// Error!
SetZero(atm);
return;
}
atm.mantissa[i] = ch;
atm.mantissa[i + 1] = 0;
}
atm.exponent = exponent;
atm.signum = sign;
if (zflag != 0)
{
atm.exponent = 0;
atm.signum = 0;
atm.dataLength = 1;
atm.mantissa[0] = 0;
}
else
{
Normalize(atm);
}
}
