/// <summary>
/// Constructs a client packet.
/// </summary>
internal NtpPacket(NtpMode mode, byte versionNumber, NtpTimestamp transmitTimestamp)
: this()
{
_data[0] = SetBits(_data[0], OFFSET_VN, LENGTH_MODE, versionNumber);
_data[0] = SetBits(_data[0], INDEX_BITFIELD, LENGTH_MODE, (byte)mode);
CopyTimestampToData(transmitTimestamp, INDEX_TRANSMIT_TIMESTAMP);
}
/// <summary>
/// Subtracts the specified timestamp from this instance, calculating the time difference between the two timestamps.
/// </summary>
/// <param name="value">A timestamp.</param>
/// <returns>A time difference (positive or negative).</returns>
public NtpTimestampDifference Subtract(NtpTimestamp value)
{
long d;
if (_timestamp >= value._timestamp)
{
d = (long)(_timestamp - value._timestamp);
}
else
{
d = -(long)(value._timestamp - _timestamp);
}
return(new NtpTimestampDifference(d));
}
void CopyTimestampToData(NtpTimestamp ts, int index)
{
UpdateData(ts.ToArray(), index, 8);
}
/// <summary>
/// Minimal size of an NTP packet (they can be larger,
/// but the optional fields are at the end and this
/// class ignores them).
/// </summary>
/// <summary>
/// Constructs an empty (i.e. with all bits set to 0) packet.
/// </summary>
internal NtpPacket()
{
_data = new byte[MinPacketSize];
_destinationTimestamp = NtpTimestamp.Now;
}
internal void SetDestinationTimestamp(NtpTimestamp timestamp)
{
_destinationTimestamp = timestamp;
}