public SimpleReadOnlySequenceSegment(IReadOnlyList <ReadOnlyMemory <T> > segments)
{
var runningIndex = segments.Aggregate((long)0, (v, s) => v + s.Length);
SimpleReadOnlySequenceSegment <T>?nextSegment = null;
for (int i = segments.Count - 1; i > 0; i--)
{
var segment = segments[i];
runningIndex -= segment.Length;
nextSegment = new SimpleReadOnlySequenceSegment <T>(segment, runningIndex, nextSegment);
}
if (segments.Count > 0)
{
var firstSegment = segments[0];
runningIndex -= firstSegment.Length;
Memory = firstSegment;
}
Debug.Assert(runningIndex == 0);
RunningIndex = runningIndex;
Next = nextSegment;
_lastSegment = nextSegment?.LastSegment;
}
private SimpleReadOnlySequenceSegment(ReadOnlyMemory <T> memory, long runningIndex, SimpleReadOnlySequenceSegment <T>?nextSegment)
{
Memory = memory;
RunningIndex = runningIndex;
Next = nextSegment;
_lastSegment = nextSegment?.LastSegment;
}
public SimpleReadOnlySequenceSegment(ReadOnlyMemory <T> firstSegment, ReadOnlySequence <T> sequence)
{
var segments = new Stack <ReadOnlyMemory <T> >(2);
long runningIndex = firstSegment.Length;
if (firstSegment.Length > 0)
{
segments.Push(firstSegment);
}
foreach (var segment in sequence)
{
if (segment.Length == 0)
{
continue;
}
runningIndex += segment.Length;
segments.Push(segment);
}
SimpleReadOnlySequenceSegment <T>?nextSegment = null;
if (segments.Count == 0)
{
Memory = firstSegment;
Debug.Assert(runningIndex == 0);
}
else
{
while (segments.Count > 1)
{
var segment = segments.Pop();
runningIndex -= segment.Length;
nextSegment = new SimpleReadOnlySequenceSegment <T>(segment, runningIndex, nextSegment);
}
Memory = segments.Pop();
Debug.Assert(runningIndex == Memory.Length);
}
RunningIndex = 0;
Next = nextSegment;
_lastSegment = nextSegment?.LastSegment;
}