public void GetFile(string remotePath, Stream outStream, bool restart)
{
if (remotePath == null)
{
throw new ArgumentNullException("remotePath");
}
if (remotePath.Length == 0)
{
throw new ArgumentException("must contain a value", "remotePath");
}
if (outStream == null)
{
throw new ArgumentNullException("outStream");
}
if (outStream.CanWrite == false)
{
throw new ArgumentException("must be writable. The CanWrite property must return the value 'true'.", "outStream");
}
FtpRequest request = new FtpRequest(base.CharacterEncoding, FtpCmd.Retr, remotePath);
if (restart)
{
long remoteSize = GetFileSize(remotePath);
if (outStream.Length == remoteSize)
{
return;
}
base.TransferData(TransferDirection.ToClient, request, outStream, outStream.Length - 1);
}
else
{
base.TransferData(TransferDirection.ToClient, request, outStream);
}
}
internal string TransferText(FtpRequest request)
{
Stream output = new MemoryStream();
TransferData(TransferDirection.ToClient, request, output);
output.Position = 0;
StreamReader reader = new StreamReader(output, _encoding);
return reader.ReadToEnd();
}
public void GetFile(string remotePath, string localPath, FileAction action)
{
if (remotePath == null)
{
throw new ArgumentNullException("remotePath");
}
if (remotePath.Length == 0)
{
throw new ArgumentException("must contain a value", "remotePath");
}
if (localPath == null)
{
throw new ArgumentNullException("localPath");
}
if (localPath.Length == 0)
{
throw new ArgumentException("must contain a value", "localPath");
}
if (action == FileAction.None)
{
throw new ArgumentOutOfRangeException("action", "must contain a value other than 'Unknown'");
}
localPath = CorrectLocalPath(localPath);
WriteToLog(String.Format("Action='GetFile';Status='TransferBegin';LocalPath='{0}';RemotePath='{1}';FileAction='{1}'", localPath, remotePath, action));
FtpRequest request = new FtpRequest(base.CharacterEncoding, FtpCmd.Retr, remotePath);
try
{
switch (action)
{
case FileAction.CreateNew:
using (Stream localFile = File.Open(localPath, FileMode.CreateNew))
{
base.TransferData(TransferDirection.ToClient, request, localFile);
}
break;
case FileAction.Create:
using (Stream localFile = File.Open(localPath, FileMode.Create))
{
base.TransferData(TransferDirection.ToClient, request, localFile);
}
break;
case FileAction.CreateOrAppend:
using (Stream localFile = File.Open(localPath, FileMode.OpenOrCreate))
{
localFile.Position = localFile.Length;
base.TransferData(TransferDirection.ToClient, request, localFile);
}
break;
case FileAction.Resume:
using (Stream localFile = File.Open(localPath, FileMode.Open))
{
long remoteSize = GetFileSize(remotePath);
if (localFile.Length == remoteSize)
{
return;
}
base.TransferData(TransferDirection.ToClient, request, localFile, localFile.Length - 1);
}
break;
case FileAction.ResumeOrCreate:
if (File.Exists(localPath) && (new FileInfo(localPath)).Length > 0)
{
GetFile(remotePath, localPath, FileAction.Resume);
}
else
{
GetFile(remotePath, localPath, FileAction.Create);
}
break;
}
}
catch (Exception ex)
{
WriteToLog(String.Format("Action='GetFile';Status='TransferError';LocalPath='{0}';RemotePath='{1}';FileAction='{1}';ErrorMessage='{2}", localPath, remotePath, action, ex.Message));
throw new FtpException(String.Format("An unexpected exception occurred while retrieving file '{0}'.", remotePath), base.LastResponse, ex);
}
WriteToLog(String.Format("Action='GetFile';Status='TransferSuccess';LocalPath='{0}';RemotePath='{1}';FileAction='{1}'", localPath, remotePath, action));
}
internal void TransferData(TransferDirection direction, FtpRequest request, Stream data, long restartPosition)
{
if (_commandConn == null || _commandConn.Connected == false)
{
throw new FtpConnectionClosedException("Connection is closed.");
}
if (request == null)
{
throw new ArgumentNullException("request", "value is required");
}
if (data == null)
{
throw new ArgumentNullException("data", "value is required");
}
switch (direction)
{
case TransferDirection.ToClient:
if (!data.CanWrite)
throw new FtpDataTransferException("Data transfer error. Data conn does not allow write operation.");
break;
case TransferDirection.ToServer:
if (!data.CanRead)
throw new FtpDataTransferException("Data transfer error. Data conn does not allow read operation.");
break;
}
if (restartPosition > 0 && !data.CanSeek)
{
throw new FtpDataTransferException("Data transfer restart error. Data conn does not allow seek operation.");
}
try
{
OpenDataConn();
if (restartPosition > 0)
{
SendRequest(new FtpRequest(_encoding, FtpCmd.Rest, restartPosition.ToString(CultureInfo.InvariantCulture)));
data.Position = restartPosition;
}
SendRequest(request);
System.Threading.Thread.Sleep(5);
WaitForDataConn();
if (_dataConn == null)
{
throw new FtpDataConnectionException("Unable to establish a data connection to the destination. The destination may have refused the connection.");
}
Stream conn = _dataConn.GetStream();
if (_securityProtocol != FtpSecurityProtocol.None)
{
conn = CreateSslStream(conn);
}
if (_isCompressionEnabled)
{
conn = CreateZlibStream(direction, conn);
}
switch (direction)
{
case TransferDirection.ToClient:
TransferBytes(conn, data, _maxDownloadSpeed * 1024);
break;
case TransferDirection.ToServer:
TransferBytes(data, conn, _maxUploadSpeed * 1024);
break;
}
}
finally
{
CloseDataConn();
}
WaitForHappyCodes(FtpResponseCode.ClosingDataConnection);
if (_hashAlgorithm != HashingFunction.None && request.IsFileTransfer)
{
DoIntegrityCheck(request, data, restartPosition);
}
}
internal void TransferData(TransferDirection direction, FtpRequest request, Stream data)
{
TransferData(direction, request, data, 0);
}
internal void SendRequest(FtpRequest request)
{
if (_commandConn == null || _commandConn.Connected == false)
{
throw new FtpConnectionClosedException("Connection is closed.");
}
DontWaitForHappyCodes();
if (ClientRequest != null)
{
ClientRequest(this, new FtpRequestEventArgs(request));
}
byte[] buffer = request.GetBytes();
try
{
_commandStream.Write(buffer, 0, buffer.Length);
}
catch (IOException ex)
{
throw new FtpConnectionBrokenException("Connection is broken. Failed to send command.", ex);
}
if (request.HasHappyCodes)
{
WaitForHappyCodes(request.GetHappyCodes());
}
else
{
if (request.Command != FtpCmd.Quit)
{
Thread.Sleep(2000);
}
DontWaitForHappyCodes();
}
}
private void DoIntegrityCheck(FtpRequest request, Stream stream, long restartPosition)
{
string path = request.Arguments[0];
long startPos = restartPosition;
long endPos = stream.Length;
string streamHash = ComputeChecksum(_hashAlgorithm, stream, startPos);
string serverHash = GetChecksum(_hashAlgorithm, path, startPos, endPos);
if (String.Compare(streamHash, serverHash, StringComparison.InvariantCultureIgnoreCase) != 0)
{
throw new FtpFileIntegrityException(String.Format("File integrity check failed. The destination integrity value '{0}' for the file '{1}' did not match the data transfer integrity value '{2}'.", serverHash, path, streamHash));
}
}
public FtpRequestEventArgs(FtpRequest request)
{
_request = request;
}
