/// <summary>
/// Return the next element if it has the expected type. Throw an
/// exception otherwise.
/// </summary>
private K3pElement GetNext(K3pElement.K3pType expected)
{
K3pElement el = Reader();
CheckType(expected, el.Type);
return(el);
}
/// <summary>
/// Throw an exception if the expected type does not match the actual
/// type.
/// </summary>
private void CheckType(K3pElement.K3pType expected, K3pElement.K3pType actual)
{
if (expected != actual)
{
throw new K3pException("expected K3P " + K3pElement.GetTypeName(expected) +
", received K3P " + K3pElement.GetTypeName(actual));
}
}
public K3pElement getRecv()
{
Debug.Assert(doneReceiving);
K3pElement m = inMsg;
flushRecv();
return(m);
}
public void doXfer()
{
bool loop = true;
while (loop)
{
loop = false;
if (inState == InState.RecvHdr)
{
int r = Base.SockRead(sock, inBuf, inPos, inBuf.Length - inPos);
if (r > 0)
{
loop = true;
inPos += r;
if (inPos == inBuf.Length)
{
inMsg = new K3pElement();
inMsg.ParseType(inBuf);
switch (inMsg.Type)
{
case K3pElement.K3pType.INS:
inState = InState.RecvIns;
inPos = 0;
inBuf = new byte[8];
break;
case K3pElement.K3pType.INT:
inState = InState.RecvInt;
inPos = 0;
inBuf = new byte[20];
break;
case K3pElement.K3pType.STR:
inState = InState.RecvStrSize;
inBuf = new byte[20];
inPos = 0;
break;
}
}
}
}
if (inState == InState.RecvIns)
{
int r = Base.SockRead(sock, inBuf, inPos, inBuf.Length - inPos);
if (r > 0)
{
loop = true;
inPos += r;
if (inPos == inBuf.Length)
{
inMsg.ParseIns(inBuf);
inState = InState.Received;
}
}
}
if (inState == InState.RecvInt || inState == InState.RecvStrSize)
{
int r = Base.SockRead(sock, inBuf, inPos, 1);
if (r > 0)
{
loop = true;
inPos += r;
if ((char)inBuf[inPos - 1] == '>')
{
byte[] tmpInBuf = new byte[inPos];
for (int i = 0; i < inPos; i++)
{
tmpInBuf[i] = inBuf[i];
}
inMsg.ParseInt(tmpInBuf);
if (inState == InState.RecvStrSize)
{
inState = InState.RecvStr;
inBuf = new byte[inMsg.Int];
inPos = 0;
if (inMsg.Int == 0)
{
inMsg.ParseStr(inBuf);
inState = InState.Received;
}
}
else
{
inState = InState.Received;
}
}
else if (inPos == inBuf.Length)
{
throw new K3pException("Expecting a '>' to end an INT in k3p message");
}
}
}
if (inState == InState.RecvStr)
{
int r = Base.SockRead(sock, inBuf, inPos, inBuf.Length - inPos);
if (r > 0)
{
loop = true;
inPos += r;
if (inPos == inBuf.Length)
{
inMsg.ParseStr(inBuf);
inState = InState.Received;
}
}
}
if (outState == OutState.Sending)
{
int r = Base.SockWrite(sock, outBuf, outPos, outBuf.Length - outPos);
if (r > 0)
{
loop = true;
outPos += r;
if (outPos == outBuf.Length)
{
outState = OutState.NoPacket;
break;
}
}
}
}
}