private void ProcessSendFile(SocketAsyncEventArgs e)
{
var bytesRead = e.BytesTransferred;
if (bytesRead > 0 && e.SocketError == SocketError.Success)
{
var receiveData = e.Buffer.Skip(e.Offset).Take(bytesRead).ToArray();
var dataList = PacketUtils.SplitBytes(receiveData, PacketUtils.ClientRequestFileTag());
if (dataList != null)
{
foreach (var request in dataList)
{
if (PacketUtils.IsPacketComplete(request))
{
int startPosition = PacketUtils.GetRequestFileStartPosition(request);
var packetSize = PacketUtils.GetPacketSize(_serverPath, _downloadChannelsCount);
if (packetSize != 0)
{
byte[] filedata = FileUtils.GetFile(_serverPath, startPosition, packetSize);
byte[] packetNumber = BitConverter.GetBytes(startPosition / packetSize);
Console.WriteLine("Receive File Request PacketNumber: " + startPosition / packetSize);
if (filedata != null)
{
//ready to send back to Client
byte[] segmentedFileResponseData = PacketUtils.PacketData(PacketUtils.ServerResponseFileTag(), filedata, packetNumber);
Array.Clear(e.Buffer, e.Offset, e.Count);
Array.Copy(segmentedFileResponseData, 0, e.Buffer, e.Offset, segmentedFileResponseData.Length);
e.Completed -= ProcessFilePosition_Completed;
e.Completed += ProcessSendFile_Completed;
if (!e.AcceptSocket.SendAsync(e))
{
CloseClientSocket(e);
}
}
}
}
}
}
}
else
{
CloseClientSocket(e);
}
}
private bool CheckPackets(Dictionary <Socket, byte[]> dictionary, int downloadChannelsCount)
{
foreach (var socket in dictionary.Keys)
{
var response = dictionary[socket];
var packets = PacketUtils.SplitBytes(response, PacketUtils.ServerResponseFileTag());
if (packets != null && packets.Any())
{
var result = packets.FirstOrDefault();
if (Crc16Utils.CheckCrcCode(result) && PacketUtils.IsPacketComplete(result))
{
var packetNumber = PacketUtils.GetResponsePacketNumber(result);
var data = PacketUtils.GetData(PacketUtils.ServerResponseFileTag(), result);
if (!ResultPacketDict.ContainsKey(packetNumber))
{
ResultPacketDict.Add(packetNumber, data);
}
}
}
}
return(ResultPacketDict.Count == downloadChannelsCount);
}
private static void ReadFilePositionRequestCallback(IAsyncResult ar)
{
ComObject state = (ComObject)ar.AsyncState;
Socket handler = state.WorkSocket;
int bytesRead = handler.EndReceive(ar);
if (bytesRead > 0)
{
var receiveData = state.Buffer.Take(bytesRead).ToArray();
var dataList = PacketUtils.SplitBytes(receiveData, PacketUtils.ClientRequestFileTag());
if (dataList != null)
{
foreach (var request in dataList)
{
if (PacketUtils.IsPacketComplete(request))
{
int startPosition = PacketUtils.GetRequestFileStartPosition(request);
SendFileResponse(handler, startPosition);
}
}
}
}
}