public void write_big_integer(BigInteger v)
{
if (v.bitCount() < 64)
{
this.write_long(v.LongValue(), true);
return;
}
int signum = (v > (BigInteger)0) ? 1 : (v < (BigInteger)0) ? -1 : 0;
if (signum < 0)
{
v = -v;
}
byte[] magnitude = v.getBytes();
int n = magnitude.Length;
// Reverse the array to make it little endian.
for (int i = 0, j = n; i < j--; i++)
{
// Swap [i] with [j]
byte b = magnitude[i];
magnitude[i] = magnitude[j];
magnitude[j] = b;
}
if ((n & 0xFF) == n)
{
write1(OtpExternal.smallBigTag);
write1(n); // length
}
else
{
write1(OtpExternal.largeBigTag);
write4BE(n); // length
}
write1(signum < 0 ? 1 : 0); // sign
// Write the array
writeN(magnitude);
}