/// <summary>
/// try to push downstream, if failed then try to pull upstream
/// </summary>
private void TryPushFrame()
{
var bufferSize = _buffer.Count;
if (bufferSize >= _frameSize)
{
PushFrame();
}
else if (bufferSize >= _stage._minimumChunkSize)
{
var iterator = _buffer.Slice(_stage._lengthFieldOffset).GetEnumerator();
var parsedLength = _stage._intDecoder(iterator, _stage._lengthFieldLength);
_frameSize = _stage._computeFrameSize.HasValue
? _stage._computeFrameSize.Value(_buffer.Slice(0, _stage._lengthFieldOffset).ToArray(), parsedLength)
: parsedLength + _stage._minimumChunkSize;
if (_frameSize > _stage._maximumFramelength)
{
FailStage(new FramingException(
$"Maximum allowed frame size is {_stage._maximumFramelength} but decoded frame header reported size {_frameSize}"));
}
else if (_stage._computeFrameSize.IsEmpty && parsedLength < 0)
{
FailStage(new FramingException(
$"Decoded frame header reported negative size {parsedLength}"));
}
else if (_frameSize < _stage._minimumChunkSize)
{
FailStage(new FramingException(
$"Computed frame size {_frameSize} is less than minimum chunk size {_stage._minimumChunkSize}"));
}
else if (bufferSize >= _frameSize)
{
PushFrame();
}
else
{
TryPull();
}
}
else
{
TryPull();
}
}
/// <summary>
/// try to push downstream, if failed then try to pull upstream
/// </summary>
private void TryPushFrame()
{
var bufferSize = _buffer.Count;
if (bufferSize >= _frameSize)
{
PushFrame();
}
else if (bufferSize >= _stage._minimumChunkSize)
{
var iterator = _buffer.Slice(_stage._lengthFieldOffset).GetEnumerator();
var parsedLength = _stage._intDecoder(iterator, _stage._lengthFieldLength);
_frameSize = parsedLength + _stage._minimumChunkSize;
if (_frameSize > _stage._maximumFramelength)
{
FailStage(new FramingException(
$"Maximum allowed frame size is {_stage._maximumFramelength} but decoded frame header reported size {_frameSize}"));
}
else if (parsedLength < 0)
{
FailStage(new FramingException(
$"Decoded frame header reported negative size {parsedLength}"));
}
else if (bufferSize >= _frameSize)
{
PushFrame();
}
else
{
TryPull();
}
}
else
{
TryPull();
}
}