DokanError IDokanOperations.ReadFile(string fileName, byte[] buffer, out int bytesRead, long offset,
DokanFileInfo info)
{
Log("ReadFile:{0}:{1}|lenght:[{2}]|offset:[{3}]", fileName,
info.Context, buffer.Length, offset);
if (info.Context == null)
{
//called when file is read as memory memory mapeded file usualy notepad and stuff
var handle = _sftpSession.RequestOpen(GetUnixPath(fileName), Flags.Read);
var data = _sftpSession.RequestRead(handle, (ulong)offset, (uint)buffer.Length);
_sftpSession.RequestClose(handle);
Buffer.BlockCopy(data, 0, buffer, 0, data.Length);
bytesRead = data.Length;
}
else
{
// var watch = Stopwatch.StartNew();
var stream = (info.Context as SftpContext).Stream;
lock (stream)
{
stream.Position = offset;
bytesRead = stream.Read(buffer, 0, buffer.Length);
}
// watch.Stop();
// Log("{0}",watch.ElapsedMilliseconds);
}
Log("END READ:{0},{1}", offset, info.Context);
return(DokanError.ErrorSuccess);
}
internal SftpContextStream(SftpSession session, string path, FileMode mode, FileAccess access,
SftpFileAttributes attributes)
{
Flags flags = Flags.None;
switch (access)
{
case FileAccess.Read:
flags = Flags.Read;
break;
case FileAccess.Write:
flags = Flags.Write;
break;
case FileAccess.ReadWrite:
flags = Flags.Read | Flags.Write;
break;
}
switch (mode)
{
case FileMode.Append:
flags |= Flags.Append;
break;
case FileMode.Create:
if (attributes == null)
{
flags |= Flags.CreateNew;
}
else
{
flags |= Flags.Truncate;
}
break;
case FileMode.CreateNew:
flags |= Flags.CreateNew;
break;
case FileMode.Open:
break;
case FileMode.OpenOrCreate:
flags |= Flags.CreateNewOrOpen;
break;
case FileMode.Truncate:
flags |= Flags.Truncate;
break;
}
_session = session;
_handle = _session.RequestOpen(path, flags);
_attributes = attributes ?? _session.RequestFStat(_handle);
if (access.HasFlag(FileAccess.Write))
{
_writeBuffer = new byte[WRITE_BUFFER_SIZE];
_writeMode = true;
}
_position = mode != FileMode.Append ? 0 : _attributes.Size;
}