public AsyncCompletionResult BeginRead(int offset, int size, TimeSpan timeout, Action <object> callback, object state)
{
ConnectionUtilities.ValidateBufferBounds(AsyncReadBufferSize, offset, size);
readCallback = callback;
try
{
SetReadTimeout(timeout);
Task <int> localTask = stream.ReadAsync(AsyncReadBuffer, offset, size);
if (!localTask.IsCompleted)
{
localTask.ContinueWith(onRead, state);
return(AsyncCompletionResult.Queued);
}
bytesRead = localTask.GetAwaiter().GetResult();
}
catch (IOException ioException)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(ConvertIOException(ioException));
}
return(AsyncCompletionResult.Completed);
}
public override int Read(byte[] buffer, int offset, int size, TimeSpan timeout)
{
ConnectionUtilities.ValidateBufferBounds(buffer, offset, size);
if (preReadCount > 0)
{
int bytesToCopy = Math.Min(size, preReadCount);
Buffer.BlockCopy(base.Connection.AsyncReadBuffer, preReadOffset, buffer, offset, bytesToCopy);
preReadOffset += bytesToCopy;
preReadCount -= bytesToCopy;
return(bytesToCopy);
}
return(base.Read(buffer, offset, size, timeout));
}
public override AsyncCompletionResult BeginRead(int offset, int size, TimeSpan timeout, Action <object> callback, object state)
{
ConnectionUtilities.ValidateBufferBounds(AsyncReadBufferSize, offset, size);
if (preReadCount > 0)
{
int bytesToCopy = Math.Min(size, preReadCount);
if (preReadData == null)
{
if (offset != preReadOffset)
{
preReadData = Fx.AllocateByteArray(preReadCount);
Buffer.BlockCopy(base.Connection.AsyncReadBuffer, preReadOffset, preReadData, 0, preReadCount);
preReadOffset = 0;
Buffer.BlockCopy(preReadData, 0, base.Connection.AsyncReadBuffer, offset, bytesToCopy);
preReadOffset += bytesToCopy;
preReadCount -= bytesToCopy;
asyncBytesRead = bytesToCopy;
return(AsyncCompletionResult.Completed);
}
// Requested offset and preReadOffset are the same so no copy needed
preReadOffset += bytesToCopy;
preReadCount -= bytesToCopy;
asyncBytesRead = bytesToCopy;
return(AsyncCompletionResult.Completed);
}
Buffer.BlockCopy(preReadData, preReadOffset, AsyncReadBuffer, offset, bytesToCopy);
preReadOffset += bytesToCopy;
preReadCount -= bytesToCopy;
asyncBytesRead = bytesToCopy;
return(AsyncCompletionResult.Completed);
}
return(base.BeginRead(offset, size, timeout, callback, state));
}
