zlib_tr_tally
bflush = zlib_tr_tally(s, s->strstart -1 - s->prev_match,
if (zlib_tr_tally (s, 0, s->window[s->strstart-1])) {
zlib_tr_tally (s, 0, s->window[s->strstart-1]);
bflush = zlib_tr_tally(s, s->strstart - s->match_start,
bflush = zlib_tr_tally (s, 0, s->window[s->strstart]);
int zlib_tr_tally (deflate_state *s, unsigned dist, unsigned lc);