public bool TryGet(ref Position position, out Memory <byte> item, bool advance = true)
{
if (position == default)
{
item = _data;
if (advance)
{
position.SetItem(_next);
}
return(!_data.IsEmpty || _next != null);
}
else if (position.IsEnd)
{
item = default;
return(false);
}
var sequence = position.GetItem <MemoryList>();
item = sequence._data;
if (advance)
{
position.SetItem(sequence._next);
}
return(true);
}
public bool TryGet(ref Position position, out ReadOnlyMemory <byte> value, bool advance = true)
{
if (position == default)
{
value = _first;
if (advance)
{
position.SetItem(Rest);
}
return(!_first.IsEmpty || _all != null);
}
if (position.IsEnd)
{
value = default;
return(false);
}
var(segment, index) = position.Get <IMemoryList <byte> >();
if (segment == null)
{
if (_all == null) // single segment ROB
{
value = _first.Slice(index - (int)_totalLengthOrVirtualIndex);
if (advance)
{
position = Position.End;
}
return(true);
}
else
{
value = default;
return(false);
}
}
var memory = segment.Memory;
// We need to slice off the last segment based on length of this ROB.
// This ROB is a potentially shorted view over a longer segment list.
var virtualIndex = segment.VirtualIndex;
var lengthOfFirst = virtualIndex - VirtualIndex;
var lengthOfEnd = lengthOfFirst + memory.Length;
if (lengthOfEnd > Length)
{
if (advance)
{
position = Position.End;
}
value = memory.Slice(0, (int)(Length - lengthOfFirst));
if (index < value.Length)
{
if (index > 0)
{
value = value.Slice(index);
}
return(true);
}
else
{
value = ReadOnlyMemory <byte> .Empty;
return(false);
}
}
else
{
value = memory.Slice(index);
if (advance)
{
position = Position.Create(0, segment.Rest);
}
return(true);
}
}
