DECOMP_CHUNK
if ((dmsg = allocb(DECOMP_CHUNK + db->hdrlen, BPRI_MED)) == NULL) {
blockctr = ((db->mru + 32 + DECOMP_CHUNK - 1) / DECOMP_CHUNK) + 5;
if (dlen < DECOMP_CHUNK) {
dlen = DECOMP_CHUNK;
mo = allocb(DECOMP_CHUNK + state->hdrlen, BPRI_MED);
ospace = DECOMP_CHUNK;
mo->b_cont = allocb(DECOMP_CHUNK, BPRI_MED);
state->strm.avail_out = ospace = DECOMP_CHUNK;