internal unsafe static Boolean TryParseBigInteger(String value, NumberStyles style, NumberFormatInfo info, out BigInteger result)
{
result = BigInteger.Zero;
ArgumentException e;
if (!TryValidateParseStyleInteger(style, out e))
{
throw e; // TryParse still throws ArgumentException on invalid NumberStyles
}
BigNumberBuffer bignumber = BigNumberBuffer.Create();
Byte * numberBufferBytes = stackalloc Byte[NumberPort.NumberBuffer.NumberBufferBytes];
NumberPort.NumberBuffer number = new NumberPort.NumberBuffer(numberBufferBytes);
result = 0;
if (!NumberPort.TryStringToNumber(value, style, ref number, bignumber.digits, info, false))
{
return(false);
}
bignumber.precision = number.precision;
bignumber.scale = number.scale;
bignumber.sign = number.sign;
if ((style & NumberStyles.AllowHexSpecifier) != 0)
{
if (!HexNumberToBigInteger(ref bignumber, ref result))
{
return(false);
}
}
else
{
if (!NumberToBigInteger(ref bignumber, ref result))
{
return(false);
}
}
return(true);
}
static String FormatBigInteger(BigInteger value, String format, NumberFormatInfo info)
{
int digits = 0;
char fmt = ParseFormatSpecifier(format, out digits);
if (fmt == 'x' || fmt == 'X')
{
return(FormatBigIntegerToHexString(value, fmt, digits, info));
}
bool decimalFmt = (fmt == 'g' || fmt == 'G' || fmt == 'd' || fmt == 'D' || fmt == 'r' || fmt == 'R');
if (value._bits == null)
{
if (fmt == 'g' || fmt == 'G' || fmt == 'r' || fmt == 'R')
{
if (digits > 0)
{
format = String.Format(CultureInfo.InvariantCulture, "D{0}", digits.ToString(CultureInfo.InvariantCulture));
}
else
{
format = "D";
}
}
return(value._sign.ToString(format, info));
}
// First convert to base 10^9.
const uint kuBase = 1000000000; // 10^9
const int kcchBase = 9;
int cuSrc = BigInteger.Length(value._bits);
int cuMax;
try
{
cuMax = checked (cuSrc * 10 / 9 + 2);
}
catch (OverflowException e) { throw new FormatException("SR.Format_TooLarge", e); }
uint[] rguDst = new uint[cuMax];
int cuDst = 0;
for (int iuSrc = cuSrc; --iuSrc >= 0;)
{
uint uCarry = value._bits[iuSrc];
for (int iuDst = 0; iuDst < cuDst; iuDst++)
{
ulong uuRes = NumericsHelpers.MakeUlong(rguDst[iuDst], uCarry);
rguDst[iuDst] = (uint)(uuRes % kuBase);
uCarry = (uint)(uuRes / kuBase);
}
if (uCarry != 0)
{
rguDst[cuDst++] = uCarry % kuBase;
uCarry /= kuBase;
if (uCarry != 0)
{
rguDst[cuDst++] = uCarry;
}
}
}
int cchMax;
try
{
// Each uint contributes at most 9 digits to the decimal representation.
cchMax = checked (cuDst * kcchBase);
}
catch (OverflowException e) { throw new FormatException("SR.Format_TooLarge", e); }
if (decimalFmt)
{
if (digits > 0 && digits > cchMax)
{
cchMax = digits;
}
if (value._sign < 0)
{
try
{
// Leave an extra slot for a minus sign.
cchMax = checked (cchMax + info.NegativeSign.Length);
}
catch (OverflowException e) { throw new FormatException("SR.Format_TooLarge", e); }
}
}
int rgchBufSize;
try
{
// We'll pass the rgch buffer to native code, which is going to treat it like a string of digits, so it needs
// to be null terminated. Let's ensure that we can allocate a buffer of that size.
rgchBufSize = checked (cchMax + 1);
}
catch (OverflowException e) { throw new FormatException("SR.Format_TooLarge", e); }
char[] rgch = new char[rgchBufSize];
int ichDst = cchMax;
for (int iuDst = 0; iuDst < cuDst - 1; iuDst++)
{
uint uDig = rguDst[iuDst];
for (int cch = kcchBase; --cch >= 0;)
{
rgch[--ichDst] = (char)('0' + uDig % 10);
uDig /= 10;
}
}
for (uint uDig = rguDst[cuDst - 1]; uDig != 0;)
{
rgch[--ichDst] = (char)('0' + uDig % 10);
uDig /= 10;
}
#if !SILVERLIGHT || FEATURE_NETCORE
if (!decimalFmt)
{
//
// Go to the VM for GlobLoc aware formatting
//
Byte *numberBufferBytes = stackalloc Byte[NumberPort.NumberBuffer.NumberBufferBytes];
NumberPort.NumberBuffer number = new NumberPort.NumberBuffer(numberBufferBytes);
// sign = true for negative and false for 0 and positive values
number.sign = (value._sign < 0);
// the cut-off point to switch (G)eneral from (F)ixed-point to (E)xponential form
number.precision = 29;
number.digits[0] = '\0';
number.scale = cchMax - ichDst;
int maxDigits = Math.Min(ichDst + 50, cchMax);
for (int i = ichDst; i < maxDigits; i++)
{
number.digits[i - ichDst] = rgch[i];
}
fixed(char *pinnedExtraDigits = rgch)
{
throw new NotImplementedException($"Could not implement NumberPort.FormatNumberBuffer. Therefore, some {nameof(BigInteger)} functionality is unimplemented.");
}
}
#endif //!SILVERLIGHT ||FEATURE_NETCORE
// Format Round-trip decimal
// This format is supported for integral types only. The number is converted to a string of
// decimal digits (0-9), prefixed by a minus sign if the number is negative. The precision
// specifier indicates the minimum number of digits desired in the resulting string. If required,
// the number is padded with zeros to its left to produce the number of digits given by the
// precision specifier.
int numDigitsPrinted = cchMax - ichDst;
while (digits > 0 && digits > numDigitsPrinted)
{
// pad leading zeros
rgch[--ichDst] = '0';
digits--;
}
if (value._sign < 0)
{
String negativeSign = info.NegativeSign;
for (int i = info.NegativeSign.Length - 1; i > -1; i--)
{
rgch[--ichDst] = info.NegativeSign[i];
}
}
return(new String(rgch, ichDst, cchMax - ichDst));
}
