public override string ToString()
{
int dataLen;
byte[] dataStuff = ByteStuffing.Stuff(_data);
if (_data == null)
{
dataLen = 0;
}
else
{
dataLen = dataStuff.Length;
}
byte[] result = new byte[3 + dataLen];
int i = 0;
result[i++] = SequenceNumber;
result[i++] = Acknowledgment;
result[i++] = _controlSum;
if (dataStuff != null)
{
foreach (var item in dataStuff)
{
result[i++] = item;
}
}
return(Encoding.UTF8.GetString(result));
}
public static Segment Parse(string stringSegment)
{
byte[] bytesSegment = Encoding.UTF8.GetBytes(stringSegment ?? throw new ArgumentNullException());
int i = 0;
byte sequenceNumber = bytesSegment[i++];
byte acknowledgment = bytesSegment[i++];
byte controlSum = bytesSegment[i++];
List <byte> list = new List <byte>();
for (int k = i; k < bytesSegment.Length; k++)
{
list.Add(bytesSegment[k]);
}
byte[] data;
if (list.Any())
{
data = ByteStuffing.ToOriginalForm(list.ToArray());
}
else
{
data = null;
}
Segment requiredSegment = new Segment(State.Received, data, sequenceNumber, acknowledgment, controlSum);
return(requiredSegment);
}
