POS_STATES
int bm_low[POS_STATES][LOW_SYMBOLS];
int bm_mid[POS_STATES][MID_SYMBOLS];
int bm_match[LZ_STATES][POS_STATES];
int bm_len[LZ_STATES][POS_STATES];
#define POS_STATE_MASK (POS_STATES - 1)