void SendHandler()
{
XmodemMessage msg = null;
lock (msgQueue)
{
if (msgQueue.Count > 0)
{
msg = msgQueue.Dequeue();
}
}
if (msg != null)
{
reTryCount = 0;
switch (msg.MessageType)
{
case XmodemMessageType.NAK:
if (SendStage == XmodemSendStage.WaitReceiveRequest)
{
SendStage = XmodemSendStage.PacketSending;
xmodemInfo.CheckMode = XModemCheckMode.CheckSum;
if (StartSend != null)
{
StartSend(xmodemInfo, null);
}
}
else if (SendStage == XmodemSendStage.WaitReceiveAnswerEndTransmit)
{
SendEOT();
}
else
{
// 通知重发或发头一包
if (ReSendPacket != null)
{
ReSendPacket(xmodemInfo, null);
}
}
break;
case XmodemMessageType.KEY_C:
if (SendStage == XmodemSendStage.WaitReceiveRequest)
{
SendStage = XmodemSendStage.PacketSending;
// 通知发头一包CRC
xmodemInfo.CheckMode = XModemCheckMode.CRC16;
if (StartSend != null)
{
StartSend(xmodemInfo, null);
}
}
break;
case XmodemMessageType.ACK:
if (SendStage == XmodemSendStage.PacketSending)
{
// 通知发下一包
if (SendNextPacket != null)
{
SendNextPacket(xmodemInfo, null);
}
}
else if (SendStage == XmodemSendStage.WaitReceiveAnswerEndTransmit)
{
// 通知中止
//if (AbortTransmit != null)
//{
// AbortTransmit(xmodemInfo, null);
//}
if (EndOfTransmit != null)
{
EndOfTransmit(xmodemInfo, null);
}
IsStart = false;
}
break;
case XmodemMessageType.CAN:
// 通知中止
if (AbortTransmit != null)
{
AbortTransmit(xmodemInfo, null);
}
break;
default:
break;
}
}
else
{
if (waitReceiveEvent.WaitOne(3000))
{
waitReceiveEvent.Reset();
}
else
{
reTryCount++;
if (reTryCount > RetryMax)
{
IsStart = false;
//通知接收超时
if (TransmitTimeOut != null)
{
TransmitTimeOut(xmodemInfo, null);
}
}
}
}
}
void ReceiveHandler()
{
if (ReceiveStage == XmodemReceiveStage.WaitForFirstPacket)
{
if (reTryCount % 2 == 0)
{
xmodemInfo.CheckMode = XModemCheckMode.CheckSum;
SendKEYC();
}
else
{
xmodemInfo.CheckMode = XModemCheckMode.CRC16;
SendNAK();
}
}
XmodemMessage msg = null;
lock (msgQueue)
{
if (msgQueue.Count > 0)
{
msg = msgQueue.Dequeue();
}
}
if (msg != null)
{
reTryCount = 0;
switch (msg.MessageType)
{
case XmodemMessageType.PACKET:
ReceiveStage = XmodemReceiveStage.PacketReceiving;
SendACK();
if (ReceivedPacket != null)
{
PacketEventArgs e = msg.Value as PacketEventArgs;
ReceivedPacket(xmodemInfo, new PacketEventArgs(e.PacketNo, e.Packet));
}
// 通知发下一包
if (SendNextPacket != null)
{
SendNextPacket(xmodemInfo, null);
}
break;
case XmodemMessageType.PACKET_ERROR:
SendNAK();
// 通知重发
if (ReSendPacket != null)
{
ReSendPacket(xmodemInfo, null);
}
break;
case XmodemMessageType.EOT:
SendACK();
// 通知完成
if (EndOfTransmit != null)
{
EndOfTransmit(xmodemInfo, null);
}
break;
case XmodemMessageType.CAN:
SendACK();
// 通知中止
if (AbortTransmit != null)
{
AbortTransmit(xmodemInfo, null);
}
break;
default:
break;
}
}
else
{
if (waitReceiveEvent.WaitOne(3000))
{
waitReceiveEvent.Reset();
}
else
{
reTryCount++;
if (reTryCount > RetryMax)
{
IsStart = false;
//通知接收超时
if (TransmitTimeOut != null)
{
TransmitTimeOut(xmodemInfo, null);
}
}
}
}
}
/// <summary>
/// 解析数据
/// </summary>
/// <param name="data"></param>
private void ParseReceivedMessage(byte[] data)
{
XmodemMessage ReceivedMessage = null;
if (data == null)
{
ReceivedMessage = null;
}
else
{
if (data[0] == STX || data[0] == SOH)
{
ReceivedMessage = new XmodemMessage(XmodemMessageType.PACKET_ERROR);
int packetLen = 0;
if (data[0] == STX)
{
packetLen = 1024;
}
else if (data[0] == SOH)
{
packetLen = 128;
}
int checkDataLen = xmodemInfo.CheckMode == XModemCheckMode.CheckSum ? 1 : 2;
if (packetLen + 3 + checkDataLen == data.Length)
{
int packetNo = 0;
if (data[1] == Convert.ToByte((~data[2]) & 0xFF))
{
packetNo = data[1];
}
int frameCheckCode = 0;
int calCheckCode = -1;
byte[] packet = new byte[packetLen];
Array.Copy(data, 3, packet, 0, packetLen);
if (xmodemInfo.CheckMode == XModemCheckMode.CheckSum)
{
frameCheckCode = data[3 + packetLen];
calCheckCode = Convert.ToByte(DataCheck.GetCheckSum(packet) & 0xFF);
}
else
{
frameCheckCode = (data[3 + packetLen] << 8) + data[3 + packetLen + 1];
calCheckCode = Convert.ToUInt16(DataCheck.GetCRC(CRCType.CRC16_XMODEM, packet) & 0xFFFF);
}
if (frameCheckCode == calCheckCode)
{
ReceivedMessage = new XmodemMessage(XmodemMessageType.PACKET, new PacketEventArgs(packetNo, packet));
}
}
msgQueue.Enqueue(ReceivedMessage);
}
else
{
foreach (byte b in data)
{
ReceivedMessage = null;
if (b == EOT)
{
ReceivedMessage = new XmodemMessage(XmodemMessageType.EOT);
}
else if (b == CAN)
{
ReceivedMessage = new XmodemMessage(XmodemMessageType.CAN);
}
else if (b == NAK)
{
ReceivedMessage = new XmodemMessage(XmodemMessageType.NAK);
}
else if (b == ACK)
{
ReceivedMessage = new XmodemMessage(XmodemMessageType.ACK);
}
else if (b == KEY_C)
{
ReceivedMessage = new XmodemMessage(XmodemMessageType.KEY_C);
}
if (ReceivedMessage != null)
{
msgQueue.Enqueue(ReceivedMessage);
}
}
}
}
waitReceiveEvent.Set();
}
