public static SequencePosition?PositionOf(this ReadOnlySequence <byte> sequence, byte value)
{
SequencePosition position = sequence.Start;
SequencePosition result = position;
while (sequence.TryGet(ref position, out ReadOnlyMemory <byte> memory))
{
var index = MemoryExtensions.IndexOf(memory.Span, value);
if (index != -1)
{
result = sequence.GetPosition(index, result);
return(result);
}
result = position;
}
return(null);
}
public static SequencePosition?PositionAt(this ReadOnlySequence <byte> sequence, long index)
{
SequencePosition position = sequence.Start;
SequencePosition result = position;
while (sequence.TryGet(ref position, out ReadOnlyMemory <byte> memory))
{
var span = memory.Span;
if (span.Length > index)
{
result = sequence.GetPosition(index, result);
return(result);
}
index -= span.Length;
result = position;
}
return(null);
}
public SequenceReader(ReadOnlySequence <T> sequence)
{
_usingSequence = true;
CurrentSpanIndex = 0;
Consumed = 0;
_sequence = sequence;
_memory = default;
_currentPosition = sequence.Start;
_length = -1;
var first = sequence.First.Span;
_nextPosition = sequence.GetPosition(first.Length);
CurrentSpan = first;
_moreData = first.Length > 0;
if (!_moreData && !sequence.IsSingleSegment)
{
_moreData = true;
GetNextSpan();
}
}
