internal static bool HandleMessage(SocketAsyncEventArgs e, DataHoldingUserToken token, int remainingBytesToProcess)
{
bool msgIsReady = false;
if (token.countReccMsgDone == 0)
{
token.byteArrayRecvMsg = new byte[token.lenRecvMsg];
}
if (remainingBytesToProcess + token.countReccMsgDone == token.lenRecvMsg)
{
Buffer.BlockCopy(e.Buffer,
token.receiveMessageOffset,
token.byteArrayRecvMsg,
token.countReccMsgDone,
remainingBytesToProcess);
msgIsReady = true;
}
else
{
Buffer.BlockCopy(e.Buffer,
token.receiveMessageOffset,
token.byteArrayRecvMsg,
token.countReccMsgDone,
remainingBytesToProcess);
token.receiveMessageOffset -= token.countRecvPfxDoneThisOp;
token.countReccMsgDone += remainingBytesToProcess;
}
return msgIsReady;
}
public static Int32 HandlePrefix(SocketAsyncEventArgs e, DataHoldingUserToken token, int remainingBytesToProcess)
{
if (token.countRecvPfxDone == 0)
{
// new message
token.byteArrayRecvPrefix = new byte[token.PrefixLength];
}
if (remainingBytesToProcess >= token.PrefixLength - token.countRecvPfxDone)
{
Buffer.BlockCopy(e.Buffer,
token.receiveMessageOffset - token.PrefixLength + token.countRecvPfxDone,
token.byteArrayRecvPrefix,
token.countReccMsgDone,
token.PrefixLength - token.countRecvPfxDone);
remainingBytesToProcess -= (token.PrefixLength - token.countRecvPfxDone);
token.countRecvPfxDoneThisOp = token.PrefixLength - token.countRecvPfxDone;
token.countRecvPfxDone = token.PrefixLength;
RetrieveCMDTypeAndMsgLen(token);
return remainingBytesToProcess;
}
else
{
Buffer.BlockCopy(e.Buffer,
token.receiveMessageOffset - token.PrefixLength + token.countRecvPfxDone,
token.byteArrayRecvPrefix,
token.countReccMsgDone,
remainingBytesToProcess);
token.countRecvPfxDoneThisOp = remainingBytesToProcess;
token.countReccMsgDone += remainingBytesToProcess;
remainingBytesToProcess = 0;
}
if (remainingBytesToProcess == 0)
{
token.receiveMessageOffset -= token.countRecvPfxDoneThisOp;
token.countRecvPfxDoneThisOp = 0;
}
return remainingBytesToProcess;
}
private static void RetrieveCMDTypeAndMsgLen(DataHoldingUserToken token)
{
Array.Copy(token.byteArrayRecvPrefix, token.byteArrayCMD, token.lenCMD);
token.lenRecvMsg = BitConverter.ToInt32(token.byteArrayRecvPrefix, token.lenCMD);
int cmd = BitConverter.ToInt32(token.byteArrayCMD, 0);
switch ((CMDTYPE)cmd)
{
case CMDTYPE.IMAGEREQ:
{
token.cmdType = CMDTYPE.IMAGEREQ;
}
break;
case CMDTYPE.IMAGERES:
{
token.cmdType = CMDTYPE.IMAGERES;
}
break;
default:
token.cmdType = CMDTYPE.NONE;
break;
}
}