+ size_t size = last->offset+last->get_data_size();
+ if(align)
+ {
+ const Bufferable *first = this;
+ for(; first->prev_in_buffer; first=first->prev_in_buffer) ;
+ size_t alignment = first->get_alignment();
+ size += alignment-1;
+ size -= size%alignment;
+ }
+ return size;