private static object DeserializeFromMarker(
ref Reader reader,
SerializerSession session,
Field field,
UnknownFieldMarker marker,
uint reference,
Type lastResortFieldType)
{
// Create a reader at the position specified by the marker.
var referencedReader = reader.ForkFrom(marker.Position);
// Determine the correct type for the field.
var fieldType = marker.Field.FieldType ?? field.FieldType ?? lastResortFieldType;
// Get a serializer for that type.
var specificSerializer = session.CodecProvider.GetCodec(fieldType);
// Reset the session's reference id so that the deserialized object overwrites the marker.
var originalCurrentReferenceId = session.ReferencedObjects.CurrentReferenceId;
session.ReferencedObjects.CurrentReferenceId = reference - 1;
// Deserialize the object, replacing the marker in the session.
try
{
return(specificSerializer.ReadValue(ref referencedReader, session, marker.Field));
}
finally
{
// Revert the reference id.
session.ReferencedObjects.CurrentReferenceId = originalCurrentReferenceId;
}
}
public static object ReadReference <TInput>(ref Reader <TInput> reader, Field field, Type expectedType)
{
MarkValueField(reader.Session);
var reference = reader.ReadVarUInt32();
if (!reader.Session.ReferencedObjects.TryGetReferencedObject(reference, out var value))
{
ThrowReferenceNotFound(expectedType, reference);
}
return(value switch
{
UnknownFieldMarker marker => DeserializeFromMarker(ref reader, field, marker, reference, expectedType),
_ => value,
});
