read BLOB column on tail heap and loop over rows

I wonder how one would read BLOB column and loop over its rows? BAT *b = table_funcs.full_column(m->session->tr, blob_col_name); //blob *readblobrows = (blob*) b->T.heap.base; //unsigned char *readblobrows = (unsigned char*) b->T.heap.base; p.s. For INT column it would be go like this: int * readintrows = (int *) b->T.heap.base; for (irow=0; irow < nrow; irow++) { intvalue = *readintrows++; } Thanks, Anton