public ArraySegment <byte> Available(int minimumSize)
{
if (Buffer.Count == 0 && Buffer.Offset != 0)
{
Buffer = new ArraySegment <byte>(Buffer.Array, 0, 0);
}
var availableSize = Buffer.Array.Length - Buffer.Offset - Buffer.Count;
if (availableSize < minimumSize)
{
if (availableSize + Buffer.Offset >= minimumSize)
{
Array.Copy(Buffer.Array, Buffer.Offset, Buffer.Array, 0, Buffer.Count);
if (Buffer.Count != 0)
{
Buffer = new ArraySegment <byte>(Buffer.Array, 0, Buffer.Count);
}
availableSize = Buffer.Array.Length - Buffer.Offset - Buffer.Count;
}
else
{
var largerSize = Buffer.Array.Length + Math.Max(Buffer.Array.Length, minimumSize);
var larger = new ArraySegment <byte>(_memory.AllocByte(largerSize), 0, Buffer.Count);
if (Buffer.Count != 0)
{
Array.Copy(Buffer.Array, Buffer.Offset, larger.Array, 0, Buffer.Count);
}
_memory.FreeByte(Buffer.Array);
Buffer = larger;
availableSize = Buffer.Array.Length - Buffer.Offset - Buffer.Count;
}
}
return(new ArraySegment <byte>(Buffer.Array, Buffer.Offset + Buffer.Count, availableSize));
}
private void Grow(int minimumAvailable)
{
if (_dataArray.Length - _dataEnd >= minimumAvailable)
{
return;
}
var newLength = _dataArray.Length + Math.Max(_dataArray.Length, minimumAvailable);
var newArray = _memory.AllocByte(newLength);
Array.Copy(_dataArray, 0, newArray, 0, _dataEnd);
_memory.FreeByte(_dataArray);
_dataArray = newArray;
}
