Bug fix: A certain kind of corrupted data the outputbuffer of the decoder could be...

Bug fix: A certain kind of corrupted data the outputbuffer of the decoder could be indexed at a negative index, this is now fixed. In addition put in redundancy in the passing of the DDL data to the decoder so that if the user gives a zero pointer it will return immideatly and print a big fat error message on stdout (I think that this message should go to std out and not to a logging file because it is a user error and the user should correct the code) (Per Thomas)