internal static object UnmarshalNumeric(Stream stream)
{
char[] chars;
int byte_length = ReadByte(stream);
NumericFlags flags = (NumericFlags)ReadByte(stream);
int byte_integer_length = ReadByte(stream);
byte_length -= 2;
int length = byte_length * 2;
int integer_length = byte_integer_length * 2;
if (length == 0 && integer_length == 0 &&
flags == 0)
{
chars = new char[1];
chars[0] = '0';
}
else
{
if ((flags & NumericFlags.NDF_LEAD0) != 0)
{
length--;
integer_length--;
}
if ((flags & NumericFlags.NDF_TRAIL0) != 0)
{
length--;
}
int fraction_length = length - integer_length;
if (fraction_length != 0)
{
length++; // for decimal point
}
chars = new char[length];
int i = 0;
byte read;
if ((flags & NumericFlags.NDF_LEAD0) != 0)
{
read = ReadByte(stream);
chars[i++] = (char)((read & 0x0f) + '0');
}
while (i < integer_length)
{
read = ReadByte(stream);
chars[i++] = (char)(((read >> 4) & 0x0f) + '0');
chars[i++] = (char)((read & 0x0f) + '0');
}
if (fraction_length != 0)
{
chars[i++] = '.';
int even_fraction_length = ((flags & NumericFlags.NDF_TRAIL0) != 0
? length - 1 : length);
while (i < even_fraction_length)
{
read = ReadByte(stream);
chars[i++] = (char)(((read >> 4) & 0x0f) + '0');
chars[i++] = (char)((read & 0x0f) + '0');
}
if (i < length)
{
read = (byte)ReadByte(stream);
chars[i++] = (char)(((read >> 4) & 0x0f) + '0');
}
}
if ((flags & NumericFlags.NDF_NAN) != 0)
{
throw new InvalidCastException("Cannot convert a NAN value to Decimal.");
}
if ((flags & NumericFlags.NDF_INF) != 0)
{
throw new InvalidCastException("Cannot convert an INF value to Decimal.");
}
}
String s = new String(chars);
Decimal value = Decimal.Parse(s, NumberStyles.AllowDecimalPoint, NumberFormatInfo.InvariantInfo);
if ((flags & NumericFlags.NDF_NEG) != 0)
{
value = -value;
}
return(value);
}
internal static void MarshalNumeric(Stream stream, decimal value)
{
NumericFlags flags = 0;
if (value < 0)
{
flags |= NumericFlags.NDF_NEG;
value = -value;
}
string s = value.ToString();
int length = s.Length;
int point_index = s.IndexOf('.');
int integer_length = point_index < 0 ? length : point_index;
int byte_length = length / 2;
int byte_integer_length = integer_length / 2;
if ((integer_length & 1) != 0)
{
byte_length++;
byte_integer_length++;
flags |= NumericFlags.NDF_LEAD0;
}
int fraction_length = point_index < 0 ? 0 : length - point_index - 1;
if ((fraction_length & 1) != 0)
{
byte_length++;
flags |= NumericFlags.NDF_TRAIL0;
}
stream.WriteByte((byte)BoxTag.DV_NUMERIC);
stream.WriteByte((byte)(byte_length + 2));
stream.WriteByte((byte)flags);
stream.WriteByte((byte)byte_integer_length);
int i = 0;
if ((flags & NumericFlags.NDF_LEAD0) != 0)
{
stream.WriteByte((byte)(s[i++] - '0'));
}
for (; i < integer_length; i += 2)
{
stream.WriteByte((byte)(((s[i] - '0') << 4) | (s[i + 1] - '0')));
}
if (fraction_length == 0)
{
return;
}
int even_end = (flags & NumericFlags.NDF_TRAIL0) != 0 ? length - 1 : length;
for (i++; i < even_end; i += 2)
{
stream.WriteByte((byte)(((s[i] - '0') << 4) | (s[i + 1] - '0')));
}
if (i < length)
{
stream.WriteByte((byte)((s[i] - '0') << 4));
}
}
