A data packet consists of a one word (32-bit) packet header, followed by some number of data words where the last data word has the TLAST field denotes the end-of-packet. The following operations are used to read and advance input packet streams and write and advance output packet streams.
int32 readincr(input_pktstream *w);
int32 readincr(input_pktstream *w, bool &tlast);
void writeincr(output_pktstream *w, int32 value);
void writeincr(output_pktstream *w, int32 value, bool tlast);The API with TLAST argument help to read or write the end-of-packet condition if the packet size is not fixed.