private static async ValueTask <int> ReadLengthAsync(this PipeReader reader, StringLengthEncoding lengthFormat, CancellationToken token)
{
ValueTask <int> result;
var littleEndian = BitConverter.IsLittleEndian;
switch (lengthFormat)
{
default:
throw new ArgumentOutOfRangeException(nameof(lengthFormat));
case StringLengthEncoding.Plain:
result = reader.ReadAsync <int>(token);
break;
case StringLengthEncoding.PlainLittleEndian:
littleEndian = true;
goto case StringLengthEncoding.Plain;
case StringLengthEncoding.PlainBigEndian:
littleEndian = false;
goto case StringLengthEncoding.Plain;
case StringLengthEncoding.Compressed:
result = reader.Read7BitEncodedIntAsync(token);
break;
}
var length = await result.ConfigureAwait(false);
length.ReverseIfNeeded(littleEndian);
return(length);
}