/// <summary>
/// Find all markers in the datagram
/// </summary>
/// <param name="data"></param>
/// <param name="markers"></param>
/// <returns></returns>
private static FoundMarker FindDatagramMarker(IEnumerable <byte> data, IEnumerable <Tuple <byte[], Marker> > markers)
{
var patternMatchResults = new List <FoundMarker>();
var aCollection = data as byte[] ?? data.ToArray();
var firstOffset = 0;
foreach (var marker in markers)
{
var offset = marker.Item2.OffsetInStream;
var result = PatternMatch <byte> .MatchOrMatchPartiallyAtEnd(aCollection, marker.Item1, firstOffset + offset);
if (!result.NoMatch)
{
if (!patternMatchResults.Any())
{
firstOffset = result.MatchPos - offset;
}
patternMatchResults.Add(new FoundMarker(marker.Item1, result, marker.Item2));
}
else
{
break; //if we have no marker, then
}
}
if (patternMatchResults.Count == 0)
{
return(null);
}
if (patternMatchResults.Count > 1)
{
// sort results: first the full matches then the partial matches, then by position
patternMatchResults.Sort((m1, m2) =>
{
if (m1.Result.FullMatch && !m2.Result.FullMatch)
{
return(-1);
}
if (m2.Result.FullMatch && !m1.Result.FullMatch)
{
return(1);
}
return(m1.Result.MatchPos - m2.Result.MatchPos);
});
}
return(patternMatchResults.First());
}