C++ (Cpp) get_len_to_pos_state Beispiele

Beispiel #1

static inline uint32_t
get_pos_len_price(const lzma_coder *const coder, const uint32_t pos,
		const uint32_t len, const uint32_t pos_state)
{
	const uint32_t len_to_pos_state = get_len_to_pos_state(len);
	uint32_t price;

	if (pos < FULL_DISTANCES) {
		price = coder->distances_prices[len_to_pos_state][pos];
	} else {
		const uint32_t pos_slot = get_pos_slot_2(pos);
		price = coder->pos_slot_prices[len_to_pos_state][pos_slot]
				+ coder->align_prices[pos & ALIGN_MASK];
	}

	price += get_len_price(&coder->match_len_encoder, len, pos_state);

	return price;
}

Beispiel #2

static inline void
match(lzma_coder *coder, const uint32_t pos_state,
		const uint32_t distance, const uint32_t len)
{
	update_match(coder->state);

	length(&coder->rc, &coder->match_len_encoder, pos_state, len,
			coder->fast_mode);

	const uint32_t pos_slot = get_pos_slot(distance);
	const uint32_t len_to_pos_state = get_len_to_pos_state(len);
	rc_bittree(&coder->rc, coder->pos_slot[len_to_pos_state],
			POS_SLOT_BITS, pos_slot);

	if (pos_slot >= START_POS_MODEL_INDEX) {
		const uint32_t footer_bits = (pos_slot >> 1) - 1;
		const uint32_t base = (2 | (pos_slot & 1)) << footer_bits;
		const uint32_t pos_reduced = distance - base;

		if (pos_slot < END_POS_MODEL_INDEX) {
			// Careful here: base - pos_slot - 1 can be -1, but
			// rc_bittree_reverse starts at probs[1], not probs[0].
			rc_bittree_reverse(&coder->rc,
				coder->pos_special + base - pos_slot - 1,
				footer_bits, pos_reduced);
		} else {
			rc_direct(&coder->rc, pos_reduced >> ALIGN_BITS,
					footer_bits - ALIGN_BITS);
			rc_bittree_reverse(
					&coder->rc, coder->pos_align,
					ALIGN_BITS, pos_reduced & ALIGN_MASK);
			++coder->align_price_count;
		}
	}

	coder->reps[3] = coder->reps[2];
	coder->reps[2] = coder->reps[1];
	coder->reps[1] = coder->reps[0];
	coder->reps[0] = distance;
	++coder->match_price_count;
}