GET_UINT16
len = GET_UINT16(cbuf) & 0xFFF;
len, len, GET_UINT16(cbuf));
if (!(GET_UINT16(cbuf) & 0x8000)) {
boff = -1 - (GET_UINT16(cbuf + cpos) >> dshift);
blen = 3 + (GET_UINT16(cbuf + cpos) & lmask);