LITERALS
while (n < LITERALS) bin_freq += s->dyn_ltree[n++].Freq;
{static_ltree, extra_lbits, LITERALS+1, L_CODES, MAX_BITS};
s->dyn_ltree[length_code[lc]+LITERALS+1].Freq++;
send_code(s, code+LITERALS+1, ltree); /* send the length code */
#define L_CODES (LITERALS+1+LENGTH_CODES)