// Private Methods (1)
private void ReadAsync_Callback(IAsyncResult result)
{
StreamAsyncEventArgs e = (StreamAsyncEventArgs)result.AsyncState;
int bytesRead = 0;
bytesRead = _stream.EndRead(result);
e.SetBuffer(e.Buffer, 0, bytesRead);
e.Complete(e);
}
public void ReadAsync(StreamAsyncEventArgs e)
{
byte[] buffer = e.Buffer;
int howManyBufferBytesToUse = 0;
int howManyStreamBytesToUse = e.Count;
if (_bufferToPrepend != null &&
_bufferToPrependPosition < _bufferToPrepend.Length)
{
// If we get here, we need to do some reading from _buffer, but how much?
// This gives the remaining length of _buffer (the available frame)
howManyBufferBytesToUse = (int)((long)_bufferToPrepend.Length - _bufferToPrependPosition);
// Trim the frame if it is larger than we wanted
if (e.Count <= howManyBufferBytesToUse)
{
howManyBufferBytesToUse = e.Count;
}
// Whatever is left, give to stream
howManyStreamBytesToUse = e.Count - howManyBufferBytesToUse;
// Blockcopy it in
_bufferToPrepend.CopyTo(buffer, e.Offset, howManyBufferBytesToUse);
// Reset our buffer
e.SetBuffer(buffer, e.Offset + howManyBufferBytesToUse, howManyStreamBytesToUse);
if (howManyStreamBytesToUse <= 0)
{
// This could be improved to always return this method before calling Complete
// but consumers should not be depending on that anyway.
e.Complete(e);
return;
}
}
_stream.BeginRead(e.Buffer, e.Offset, e.Count, new AsyncCallback(ReadAsync_Callback), e);
}
public void ReadAsync(StreamAsyncEventArgs e)
{
byte[] buffer = e.Buffer;
int howManyBufferBytesToUse = 0;
int howManyStreamBytesToUse = e.Count;
if (_bufferToPrepend != null &&
_bufferToPrependPosition < _bufferToPrepend.Length)
{
// If we get here, we need to do some reading from _buffer, but how much?
// This gives the remaining length of _buffer (the available frame)
howManyBufferBytesToUse = (int)((long)_bufferToPrepend.Length - _bufferToPrependPosition);
// Trim the frame if it is larger than we wanted
if (e.Count <= howManyBufferBytesToUse) howManyBufferBytesToUse = e.Count;
// Whatever is left, give to stream
howManyStreamBytesToUse = e.Count - howManyBufferBytesToUse;
// Blockcopy it in
_bufferToPrepend.CopyTo(buffer, e.Offset, howManyBufferBytesToUse);
// Reset our buffer
e.SetBuffer(buffer, e.Offset + howManyBufferBytesToUse, howManyStreamBytesToUse);
if (howManyStreamBytesToUse <= 0)
{
// This could be improved to always return this method before calling Complete
// but consumers should not be depending on that anyway.
e.Complete(e);
return;
}
}
_stream.BeginRead(e.Buffer, e.Offset, e.Count, new AsyncCallback(ReadAsync_Callback), e);
}