public void OnDataBlockReading(DataBlockReadingEventArgs e)
{
if (_isCompleted) {
e.IsCompleted = true;
if (_reader != null) {
_reader.Dispose();
}
return;
}
if (_reader == null) {
_reader = new BinaryReader(_fileStream);
}
var bytes = _reader.ReadBytes(e.MaxBlockSize);
e.ResponseWriter.Write(bytes);
_isCompleted = _reader.BaseStream.Position == _reader.BaseStream.Length;
}
protected virtual void OnDataBlockReading(DataBlockReadingEventArgs e)
{
var handler = ResponseDataReading;
if (handler != null) {
handler(this, e);
}
}
private int ReadResponse(IntPtr self, IntPtr dataout, int bytestoread, ref int bytesread, IntPtr callback)
{
using (var writer = new BinaryWriter(new MemoryStream(), Encoding.UTF8)) {
var e = new DataBlockReadingEventArgs(writer) {
MaxBlockSize = bytestoread,
DelayController =
CallbackObject.FromHandle(callback)
};
OnDataBlockReading(e);
if (e.DelayController.IsPaused) {
// Data retrieval can be resumed by calling Resume() on the controller.
bytesread = 0;
return 1;
}
e.ResponseWriter.Flush();
e.ResponseWriter.Seek(0, SeekOrigin.Begin);
if (e.ResponseWriter.BaseStream.Length == 0) {
bytesread = 0;
return 0;
}
using (var reader = new BinaryReader(e.ResponseWriter.BaseStream)) {
var bytes = reader.ReadBytes(e.MaxBlockSize);
bytesread = bytes.Length;
Marshal.Copy(bytes, 0, dataout, bytesread);
}
return e.IsCompleted ? 0 : 1;
}
}