public TlVStream?DeserializeTlvStream(ref SequenceReader <byte> reader)
{
if (reader.Remaining <= 0)
{
return(null);
}
var message = new TlVStream();
while (reader.Remaining > 0)
{
ulong recordType = reader.ReadBigSize();
ulong recordLength = reader.ReadBigSize();
if (recordLength > MAX_RECORD_SIZE)
{
// check the max size
throw new SerializationException("Record is too large");
}
if ((long)recordLength > reader.Remaining)
{
// check the max size
throw new SerializationException("Record length exceeds the remaining message");
}
// check if known type
if (TryGetType(recordType, out ITlvRecordSerializer? recordSerializer))
{
// type known
ReadOnlySequence <byte> sequence = reader.Sequence.Slice(reader.Position, (int)recordLength);
var innerReader = new SequenceReader <byte>(sequence);
TlvRecord record = recordSerializer.Deserialize(ref innerReader);
message.Records.Add(record);
if (innerReader.Consumed != (long)recordLength)
{
throw new SerializationException("Record length inconsistent to tlv length");
}
reader.Advance((long)recordLength);
}
else
{
// type unknown
if (recordType % 2 == 0)
{
//if even, throw
throw new MessageSerializationException("TlvSerialization error, sequence error");
}
else
{
message.Records.Add(new TlvRecord()
{
Type = recordType, Size = recordLength
});
// read record value (we aren't interested in these bytes so we just advance)
reader.Advance((long)recordLength);
}
}
}
return(message);
}