private static UdpPacketImageExtend ResolveImageExtend(BinaryReader rdr, byte[] priKey)
{
UdpPacketImageExtend extend = new UdpPacketImageExtend();
int len = rdr.ReadInt32();
byte[] buf = rdr.ReadBytes(len);
byte[] deBuf = SecurityFactory.Decrypt(buf, priKey);
using (MemoryStream ms = new MemoryStream(deBuf))
{
Image image = Image.FromStream(ms);
extend.Image = image;
}
return(extend);
}
private long SendImageCore(LanUser user, Image image, string imagePath)
{
string path;
if (image != null)
{
path = LanConfig.Instance.GetTempFileName(".png");
image.Save(path, ImageFormat.Png);
}
else
{
path = imagePath;
}
long len = LanFile.GetFileLength(path);
if (len > UdpClientEx.UDP_MAX_BUF_SIZE)
{
//图像文件过大的话用文件形式发送
return(SendFile(user, path, true));
}
else
{
UdpPacket packet = new UdpPacket();
packet.Address = user.IP;
packet.Port = user.Port;
packet.ToMAC = user.MAC;
packet.Command = UdpPacket.CMD_SEND_IMAGE | UdpPacket.CMD_OPTION_NEED_RESPONSE;
packet.FromMAC = this.MAC;
UdpPacketImageExtend extend = new UdpPacketImageExtend();
extend.EncryptKey = user.SecurityKeys.Public;
extend.Image = image ?? Image.FromFile(path);
packet.Extend = extend;
_client.Send(packet);
if (image != null)
{
//直接发送图像的话，临时图片就删除
LanFile.Delete(path);
}
return(packet.ID);
}
}
private static void EncodeImageExtend(BinaryWriter wtr, object extendObj)
{
UdpPacketImageExtend extend = extendObj as UdpPacketImageExtend;
if (extend == null)
{
throw new Exception("[EncodeImageExtend]未想定附加包");
}
using (MemoryStream ms = new MemoryStream())
{
Image image = extend.Image;
image.Save(ms, image.RawFormat);
byte[] buf = ms.ToArray();
byte[] enBuf = SecurityFactory.Encrypt(buf, extend.EncryptKey);
wtr.Write(enBuf.Length);
wtr.Write(enBuf);
}
}
private void ReceivePacketEvent(object sender, UdpClientReceiveEventArgs args)
{
UdpPacket packet = args.Packet as UdpPacket;
if (packet.CheckSendResponse)
{
#region 需要回应收到包
if (packet.Version == Packet.VERSION)
{
UdpPacket packetRsp = new UdpPacket();
packetRsp.Address = packet.Address;
packetRsp.Port = packet.Port;
packet.ToMAC = packet.ToMAC;
packetRsp.FromMAC = this.MAC;
packetRsp.Command = UdpPacket.CMD_RESPONSE;
UdpPacketResponseExtend extend = new UdpPacketResponseExtend();
extend.ID = packet.ID;
packetRsp.Extend = extend;
_client.Send(packetRsp);
}
#endregion
}
if (packet.CMD == UdpPacket.CMD_NOTHING)
{
//do nothing
}
else if (packet.CMD == UdpPacket.CMD_ENTRY)
{
#region CMD_ENTRY 对方上线
UpdateState updateState = UpdateContacter(packet);
//TODO 应该更新所有的，但是跨网的时候好像发送的byte太长，不能正常发送暂且去掉头像
//SendUpdateStatePacket(LanIM.UpdateState.All,
// packet.Address, packet.Port, packet.FromMAC);
SendUpdateStatePacket(LanIM.UpdateState.NickName | LanIM.UpdateState.PublicKey | LanIM.UpdateState.Status,
packet.Address, packet.Port, packet.FromMAC);
if (UserEntry != null)
{
LanUser user = this[packet.FromMAC];
UserStateChangeEventArgs stateArgs = new UserStateChangeEventArgs(user, updateState);
UserEntry(this, stateArgs);
}
#endregion
}
else if (packet.CMD == UdpPacket.CMD_EXIT)
{
#region CMD_EXIT
if (UserExit != null)
{
LanUser user = this[packet.FromMAC];
user.Status = UserStatus.Offline;
UserStateChangeEventArgs stateArgs = new UserStateChangeEventArgs(user, LanIM.UpdateState.Status);
UserExit(this, stateArgs);
}
#endregion
}
else if (packet.CMD == UdpPacket.CMD_STATE)
{
#region CMD_STATE
UpdateState updateState = UpdateContacter(packet);
if (UserStateChange != null)
{
LanUser user = this[packet.FromMAC];
UserStateChangeEventArgs stateArgs = new UserStateChangeEventArgs(user, updateState);
UserStateChange(this, stateArgs);
}
#endregion
}
else if (packet.CMD == UdpPacket.CMD_SEND_TEXT)
{
#region CMD_SEND_TEXT
UdpPacketTextExtend extend = packet.Extend as UdpPacketTextExtend;
if (TextMessageReceived != null)
{
LanUser user = this[packet.FromMAC];
TextMessageReceivedEventArgs stateArgs = new TextMessageReceivedEventArgs(user, packet.ID, extend.Text);
TextMessageReceived(this, stateArgs);
}
#endregion
}
else if (packet.CMD == UdpPacket.CMD_SEND_IMAGE)
{
#region CMD_SEND_IMAGE
UdpPacketImageExtend extend = packet.Extend as UdpPacketImageExtend;
if (ImageReceived != null)
{
LanUser user = this[packet.FromMAC];
ImageReceivedEventArgs stateArgs = new ImageReceivedEventArgs(user, packet.ID, extend.Image);
ImageReceived(this, stateArgs);
}
#endregion
}
else if (packet.CMD == UdpPacket.CMD_SEND_FILE_REQUEST)
{
#region CMD_SEND_FILE_REQUEST
LanUser user = this[packet.FromMAC];
UdpPacketSendFileRequestExtend extend = packet.Extend as UdpPacketSendFileRequestExtend;
TransportFile file = new TransportFile(packet.ID, user.MAC, user.IP, user.Port, user.SecurityKeys.Public, extend.File);
if ((packet.Command & UdpPacket.CMD_OPTION_SEND_FILE_IMAGE) != 0)
{
//接收图像
if (ImageReceived != null)
{
this.ReceiveImage(user, file);
}
}
else
{
if (FileTransportRequested != null)
{
FileTransportRequestedEventArgs stateArgs = new FileTransportRequestedEventArgs(user, file);
FileTransportRequested(this, stateArgs);
}
}
#endregion
}
else if (packet.CMD == UdpPacket.CMD_RESPONSE)
{
UdpPacketResponseExtend extend = packet.Extend as UdpPacketResponseExtend;
_client.NotifySendPacketSuccess(extend.ID);
}
else
{
throw new Exception("未想定命令");
}
}
