public ReadWriteBytes Slice(Position from)
{
var(segment, index) = from.Get <IMemoryList <byte> >();
if (segment == null)
{
return(Slice(First.Length - index));
}
var headIndex = _all.VirtualIndex + _all.Memory.Length - _first.Length;
var newHeadIndex = segment.VirtualIndex;
var diff = newHeadIndex - headIndex;
// TODO: this could be optimized to avoid the Slice
return(new ReadWriteBytes(segment, Length - diff).Slice(index));
}
public bool TryGet(ref Position position, out Memory <byte> item, bool advance = true)
{
if (position == default)
{
item = default;
return(false);
}
var(list, index) = position.Get <BufferList>();
item = list._data.Slice(index);
if (advance)
{
position = new Position(list._next, 0);
}
return(true);
}
public ReadWriteBytes Slice(Position position)
{
var kind = Kind;
switch (kind)
{
case Type.Array:
var(array, index) = position.Get <byte[]>();
return(new ReadWriteBytes(array, index, array.Length - index));
case Type.MemoryList:
return(Slice(position, new Position((IMemoryList <byte>)_end, _endIndex)));
default: throw new NotImplementedException();
}
}
public bool TryGet(ref Position position, out Memory <byte> item, bool advance = true)
{
if (position == default)
{
item = default;
return(false);
}
var array = _start as byte[];
if (array != null)
{
var start = _startIndex + (int)position;
var length = _endIndex - _startIndex - (int)position;
item = new Memory <byte>(array, start, length);
if (advance)
{
position = default;
}
return(true);
}
if (Kind == Type.MemoryList)
{
var(node, index) = position.Get <IMemoryList <byte> >();
item = node.Memory.Slice(index);
if (ReferenceEquals(node, _end))
{
item = item.Slice(0, _endIndex - index);
if (advance)
{
position = default;
}
}
else
{
if (advance)
{
position = new Position(node.Next, 0);
}
}
return(true);
}
throw new NotImplementedException();
}
public ReadWriteBytes Slice(Position start, Position end)
{
var kind = Kind;
switch (kind)
{
case Type.Array:
var(array, index) = start.Get <byte[]>();
return(new ReadWriteBytes(array, index, (int)end - index));
case Type.MemoryList:
var(startList, startIndex) = start.Get <IMemoryList <byte> >();
var(endList, endIndex) = end.Get <IMemoryList <byte> >();
return(new ReadWriteBytes(startList, startIndex, endList, endIndex));
default:
throw new NotImplementedException();
}
}
public ReadOnlyBytes Slice(Position from, Position to)
{
var(fromSegment, fromIndex) = from.Get <IMemoryList <byte> >();
var(toSegment, toIndex) = to.Get <IMemoryList <byte> >();
if (fromSegment == null)
{
return(Slice(fromIndex - _totalLengthOrVirtualIndex, toIndex - fromIndex));
}
var headIndex = _all.VirtualIndex + _all.Memory.Length - _first.Length;
var newHeadIndex = fromSegment.VirtualIndex + fromIndex;
var newEndIndex = toSegment.VirtualIndex + toIndex;
var slicedOffFront = newHeadIndex - headIndex;
var length = newEndIndex - newHeadIndex;
// TODO: this could be optimized to avoid the Slice
var slice = new ReadOnlyBytes(fromSegment, length + fromIndex);
slice = slice.Slice(fromIndex);
return(slice);
}
public bool TryGet(ref Position position, out ReadOnlyMemory <byte> item, bool advance = true)
{
if (position.IsEnd)
{
item = default;
return(false);
}
var array = _start as byte[];
if (array != null)
{
var start = _startIndex + position.Index;
var length = _endIndex - _startIndex - position.Index;
item = new ReadOnlyMemory <byte>(array, start, length);
if (advance)
{
position = Position.End;
}
return(true);
}
if (Kind == Type.MemoryList)
{
if (position == default)
{
var first = _start as IMemoryList <byte>;
item = first.Memory.Slice(_startIndex);
if (advance)
{
position = Position.Create(first.Next);
}
if (ReferenceEquals(_end, _start))
{
item = item.Slice(0, (int)Length);
if (advance)
{
position = Position.End;
}
}
return(true);
}
var(node, index) = position.Get <IMemoryList <byte> >();
item = node.Memory.Slice(index);
if (ReferenceEquals(node, _end))
{
item = item.Slice(0, _endIndex - index);
if (advance)
{
position = Position.End;
}
}
else
{
if (advance)
{
position = Position.Create(node.Next);
}
}
return(true);
}
throw new NotImplementedException();
}
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);
}
}
public bool TryGet(ref Position position, out ReadOnlyMemory <byte> item, bool advance = true)
{
if (position == default)
{
item = default;
return(false);
}
var array = _start as byte[];
if (array != null)
{
var start = (int)position;
var length = _endIndex - (int)position;
if (length == 0)
{
item = ReadOnlyMemory <byte> .Empty;
}
else
{
item = new ReadOnlyMemory <byte>(array, start, length);
}
if (advance)
{
position = default;
}
return(true);
}
if (Kind == Type.MemoryList)
{
var(node, index) = position.Get <IBufferList>();
item = node.Memory.Slice(index);
if (ReferenceEquals(node, _end))
{
item = item.Slice(0, _endIndex - index);
if (advance)
{
position = default;
}
}
else
{
if (advance)
{
position = new Position(node.Next, 0);
}
}
return(true);
}
var om = _start as OwnedMemory <byte>;
if (om != null)
{
var start = (int)position;
var length = _endIndex - (int)position;
item = om.Memory.Slice(start, length);
if (advance)
{
position = default;
}
return(true);
}
throw new NotImplementedException();
}