nl_tokens: Flush the bit buffer keeping at most 7 bits in it .
pl_tokens: <mask> bi_flush ( ) { if ( bi_valid == 16 ) { put_short ( bi_buf ) ; bi_buf = 0 ; bi_valid = 0 ; } else if ( bi_valid >= 8 ) { put_byte ( bi_buf & 0xff ) ; bi_buf >>>= 8 ; bi_valid -= 8 ; } }