#ifndef LZMA_FASTPOS_H
#define LZMA_FASTPOS_H
-// LZMA encodes match distances (positions) by storing the highest two
-// bits using a six-bit value [0, 63], and then the missing lower bits.
-// Dictionary size is also stored using this encoding in the new .lzma
+// LZMA encodes match distances by storing the highest two bits using
+// a six-bit value [0, 63], and then the missing lower bits.
+// Dictionary size is also stored using this encoding in the .xz
// file format header.
//
// fastpos.h provides a way to quickly find out the correct six-bit
// values. The following table gives some examples of this encoding:
//
-// pos return
+// dist return
// 0 0
// 1 1
// 2 2
// Provided functions or macros
// ----------------------------
//
-// get_pos_slot(pos) is the basic version. get_pos_slot_2(pos)
-// assumes that pos >= FULL_DISTANCES, thus the result is at least
-// FULL_DISTANCES_BITS * 2. Using get_pos_slot(pos) instead of
-// get_pos_slot_2(pos) would give the same result, but get_pos_slot_2(pos)
+// get_dist_slot(dist) is the basic version. get_dist_slot_2(dist)
+// assumes that dist >= FULL_DISTANCES, thus the result is at least
+// FULL_DISTANCES_BITS * 2. Using get_dist_slot(dist) instead of
+// get_dist_slot_2(dist) would give the same result, but get_dist_slot_2(dist)
// should be tiny bit faster due to the assumption being made.
//
//
// slightly faster, but sometimes it is a lot slower.
#ifdef HAVE_SMALL
-# define get_pos_slot(pos) ((pos) <= 4 ? (pos) : get_pos_slot_2(pos))
+# define get_dist_slot(dist) \
+ ((dist) <= 4 ? (dist) : get_dist_slot_2(dist))
static inline uint32_t
-get_pos_slot_2(uint32_t pos)
+get_dist_slot_2(uint32_t dist)
{
- const uint32_t i = bsr32(pos);
- return (i + i) + ((pos >> (i - 1)) & 1);
+ const uint32_t i = bsr32(dist);
+ return (i + i) + ((dist >> (i - 1)) & 1);
}
#define fastpos_limit(extra, n) \
(UINT32_C(1) << (FASTPOS_BITS + fastpos_shift(extra, n)))
-#define fastpos_result(pos, extra, n) \
- lzma_fastpos[(pos) >> fastpos_shift(extra, n)] \
+#define fastpos_result(dist, extra, n) \
+ lzma_fastpos[(dist) >> fastpos_shift(extra, n)] \
+ 2 * fastpos_shift(extra, n)
static inline uint32_t
-get_pos_slot(uint32_t pos)
+get_dist_slot(uint32_t dist)
{
// If it is small enough, we can pick the result directly from
// the precalculated table.
- if (pos < fastpos_limit(0, 0))
- return lzma_fastpos[pos];
+ if (dist < fastpos_limit(0, 0))
+ return lzma_fastpos[dist];
- if (pos < fastpos_limit(0, 1))
- return fastpos_result(pos, 0, 1);
+ if (dist < fastpos_limit(0, 1))
+ return fastpos_result(dist, 0, 1);
- return fastpos_result(pos, 0, 2);
+ return fastpos_result(dist, 0, 2);
}
#ifdef FULL_DISTANCES_BITS
static inline uint32_t
-get_pos_slot_2(uint32_t pos)
+get_dist_slot_2(uint32_t dist)
{
- assert(pos >= FULL_DISTANCES);
+ assert(dist >= FULL_DISTANCES);
- if (pos < fastpos_limit(FULL_DISTANCES_BITS - 1, 0))
- return fastpos_result(pos, FULL_DISTANCES_BITS - 1, 0);
+ if (dist < fastpos_limit(FULL_DISTANCES_BITS - 1, 0))
+ return fastpos_result(dist, FULL_DISTANCES_BITS - 1, 0);
- if (pos < fastpos_limit(FULL_DISTANCES_BITS - 1, 1))
- return fastpos_result(pos, FULL_DISTANCES_BITS - 1, 1);
+ if (dist < fastpos_limit(FULL_DISTANCES_BITS - 1, 1))
+ return fastpos_result(dist, FULL_DISTANCES_BITS - 1, 1);
- return fastpos_result(pos, FULL_DISTANCES_BITS - 1, 2);
+ return fastpos_result(dist, FULL_DISTANCES_BITS - 1, 2);
}
#endif
if (d == UINT32_MAX)
out[0] = 40;
else
- out[0] = get_pos_slot(d + 1) - 24;
+ out[0] = get_dist_slot(d + 1) - 24;
return LZMA_OK;
}
// Match distance //
////////////////////
-// Different set of probabilities is used for match distances that have very
+// Different sets of probabilities are used for match distances that have very
// short match length: Lengths of 2, 3, and 4 bytes have a separate set of
// probabilities for each length. The matches with longer length use a shared
// set of probabilities.
-#define LEN_TO_POS_STATES 4
+#define DIST_STATES 4
// Macro to get the index of the appropriate probability array.
-#define get_len_to_pos_state(len) \
- ((len) < LEN_TO_POS_STATES + MATCH_LEN_MIN \
+#define get_dist_state(len) \
+ ((len) < DIST_STATES + MATCH_LEN_MIN \
? (len) - MATCH_LEN_MIN \
- : LEN_TO_POS_STATES - 1)
+ : DIST_STATES - 1)
-// The highest two bits of a match distance (pos slot) are encoded using six
-// bits. See fastpos.h for more explanation.
-#define POS_SLOT_BITS 6
-#define POS_SLOTS (1 << POS_SLOT_BITS)
+// The highest two bits of a match distance (distance slot) are encoded
+// using six bits. See fastpos.h for more explanation.
+#define DIST_SLOT_BITS 6
+#define DIST_SLOTS (1 << DIST_SLOT_BITS)
// Match distances up to 127 are fully encoded using probabilities. Since
-// the highest two bits (pos slot) are always encoded using six bits, the
-// distances 0-3 don't need any additional bits to encode, since the pos
-// slot itself is the same as the actual distance. START_POS_MODEL_INDEX
-// indicates the first pos slot where at least one additional bit is needed.
-#define START_POS_MODEL_INDEX 4
+// the highest two bits (distance slot) are always encoded using six bits,
+// the distances 0-3 don't need any additional bits to encode, since the
+// distance slot itself is the same as the actual distance. DIST_MODEL_START
+// indicates the first distance slot where at least one additional bit is
+// needed.
+#define DIST_MODEL_START 4
// Match distances greater than 127 are encoded in three pieces:
-// - pos slot: the highest two bits
+// - distance slot: the highest two bits
// - direct bits: 2-26 bits below the highest two bits
// - alignment bits: four lowest bits
//
// Direct bits don't use any probabilities.
//
-// The pos slot value of 14 is for distances 128-191 (see the table in
+// The distance slot value of 14 is for distances 128-191 (see the table in
// fastpos.h to understand why).
-#define END_POS_MODEL_INDEX 14
+#define DIST_MODEL_END 14
-// Pos slots that indicate a distance <= 127.
-#define FULL_DISTANCES_BITS (END_POS_MODEL_INDEX / 2)
+// Distance slots that indicate a distance <= 127.
+#define FULL_DISTANCES_BITS (DIST_MODEL_END / 2)
#define FULL_DISTANCES (1 << FULL_DISTANCES_BITS)
// For match distances greater than 127, only the highest two bits and the
// lowest four bits (alignment) is encoded using probabilities.
#define ALIGN_BITS 4
-#define ALIGN_TABLE_SIZE (1 << ALIGN_BITS)
-#define ALIGN_MASK (ALIGN_TABLE_SIZE - 1)
+#define ALIGN_SIZE (1 << ALIGN_BITS)
+#define ALIGN_MASK (ALIGN_SIZE - 1)
// LZMA remembers the four most recent match distances. Reusing these distances
// tends to take less space than re-encoding the actual distance value.
-#define REP_DISTANCES 4
+#define REPS 4
#endif
/// Probability tree for the highest two bits of the match distance.
/// There is a separate probability tree for match lengths of
/// 2 (i.e. MATCH_LEN_MIN), 3, 4, and [5, 273].
- probability pos_slot[LEN_TO_POS_STATES][POS_SLOTS];
+ probability dist_slot[DIST_STATES][DIST_SLOTS];
/// Probability trees for additional bits for match distance when the
/// distance is in the range [4, 127].
- probability pos_special[FULL_DISTANCES - END_POS_MODEL_INDEX];
+ probability pos_special[FULL_DISTANCES - DIST_MODEL_END];
/// Probability tree for the lowest four bits of a match distance
/// that is equal to or greater than 128.
- probability pos_align[ALIGN_TABLE_SIZE];
+ probability pos_align[ALIGN_SIZE];
/// Length of a normal match
lzma_length_decoder match_len_decoder;
SEQ_LITERAL_WRITE,
SEQ_IS_REP,
seq_len(SEQ_MATCH_LEN),
- seq_6(SEQ_POS_SLOT),
- SEQ_POS_MODEL,
+ seq_6(SEQ_DIST_SLOT),
+ SEQ_DIST_MODEL,
SEQ_DIRECT,
seq_4(SEQ_ALIGN),
SEQ_EOPM,
// Prepare to decode the highest two bits of the
// match distance.
- probs = coder->pos_slot[get_len_to_pos_state(len)];
+ probs = coder->dist_slot[get_dist_state(len)];
symbol = 1;
#ifdef HAVE_SMALL
- case SEQ_POS_SLOT:
+ case SEQ_DIST_SLOT:
do {
- rc_bit(probs[symbol], , , SEQ_POS_SLOT);
- } while (symbol < POS_SLOTS);
+ rc_bit(probs[symbol], , , SEQ_DIST_SLOT);
+ } while (symbol < DIST_SLOTS);
#else
- rc_bit_case(probs[symbol], , , SEQ_POS_SLOT0);
- rc_bit_case(probs[symbol], , , SEQ_POS_SLOT1);
- rc_bit_case(probs[symbol], , , SEQ_POS_SLOT2);
- rc_bit_case(probs[symbol], , , SEQ_POS_SLOT3);
- rc_bit_case(probs[symbol], , , SEQ_POS_SLOT4);
- rc_bit_case(probs[symbol], , , SEQ_POS_SLOT5);
+ rc_bit_case(probs[symbol], , , SEQ_DIST_SLOT0);
+ rc_bit_case(probs[symbol], , , SEQ_DIST_SLOT1);
+ rc_bit_case(probs[symbol], , , SEQ_DIST_SLOT2);
+ rc_bit_case(probs[symbol], , , SEQ_DIST_SLOT3);
+ rc_bit_case(probs[symbol], , , SEQ_DIST_SLOT4);
+ rc_bit_case(probs[symbol], , , SEQ_DIST_SLOT5);
#endif
// Get rid of the highest bit that was needed for
// indexing of the probability array.
- symbol -= POS_SLOTS;
+ symbol -= DIST_SLOTS;
assert(symbol <= 63);
- if (symbol < START_POS_MODEL_INDEX) {
+ if (symbol < DIST_MODEL_START) {
// Match distances [0, 3] have only two bits.
rep0 = symbol;
} else {
assert(limit >= 1 && limit <= 30);
rep0 = 2 + (symbol & 1);
- if (symbol < END_POS_MODEL_INDEX) {
+ if (symbol < DIST_MODEL_END) {
// Prepare to decode the low bits for
// a distance of [4, 127].
assert(limit <= 5);
- symbol - 1;
symbol = 1;
offset = 0;
- case SEQ_POS_MODEL:
+ case SEQ_DIST_MODEL:
#ifdef HAVE_SMALL
do {
rc_bit(probs[symbol], ,
rep0 += 1 << offset,
- SEQ_POS_MODEL);
+ SEQ_DIST_MODEL);
} while (++offset < limit);
#else
switch (limit) {
assert(offset == 0);
rc_bit(probs[symbol], ,
rep0 += 1,
- SEQ_POS_MODEL);
+ SEQ_DIST_MODEL);
++offset;
--limit;
case 4:
rc_bit(probs[symbol], ,
rep0 += 1 << offset,
- SEQ_POS_MODEL);
+ SEQ_DIST_MODEL);
++offset;
--limit;
case 3:
rc_bit(probs[symbol], ,
rep0 += 1 << offset,
- SEQ_POS_MODEL);
+ SEQ_DIST_MODEL);
++offset;
--limit;
case 2:
rc_bit(probs[symbol], ,
rep0 += 1 << offset,
- SEQ_POS_MODEL);
+ SEQ_DIST_MODEL);
++offset;
--limit;
case 1:
// "symbol".
rc_bit_last(probs[symbol], ,
rep0 += 1 << offset,
- SEQ_POS_MODEL);
+ SEQ_DIST_MODEL);
}
#endif
} else {
rc_bit(coder->pos_align[symbol], ,
rep0 += 4, SEQ_ALIGN2);
case SEQ_ALIGN3:
- // Like in SEQ_POS_MODEL, we don't
+ // Like in SEQ_DIST_MODEL, we don't
// need "symbol" for anything else
// than indexing the probability array.
rc_bit_last(coder->pos_align[symbol], ,
bit_reset(coder->is_rep2[i]);
}
- for (uint32_t i = 0; i < LEN_TO_POS_STATES; ++i)
- bittree_reset(coder->pos_slot[i], POS_SLOT_BITS);
+ for (uint32_t i = 0; i < DIST_STATES; ++i)
+ bittree_reset(coder->dist_slot[i], DIST_SLOT_BITS);
- for (uint32_t i = 0; i < FULL_DISTANCES - END_POS_MODEL_INDEX; ++i)
+ for (uint32_t i = 0; i < FULL_DISTANCES - DIST_MODEL_END; ++i)
bit_reset(coder->pos_special[i]);
bittree_reset(coder->pos_align, ALIGN_BITS);
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
+ const uint32_t dist_slot = get_dist_slot(distance);
+ const uint32_t dist_state = get_dist_state(len);
+ rc_bittree(&coder->rc, coder->dist_slot[dist_state],
+ DIST_SLOT_BITS, dist_slot);
+
+ if (dist_slot >= DIST_MODEL_START) {
+ const uint32_t footer_bits = (dist_slot >> 1) - 1;
+ const uint32_t base = (2 | (dist_slot & 1)) << footer_bits;
+ const uint32_t dist_reduced = distance - base;
+
+ if (dist_slot < DIST_MODEL_END) {
+ // Careful here: base - dist_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);
+ coder->dist_special + base - dist_slot - 1,
+ footer_bits, dist_reduced);
} else {
- rc_direct(&coder->rc, pos_reduced >> ALIGN_BITS,
+ rc_direct(&coder->rc, dist_reduced >> ALIGN_BITS,
footer_bits - ALIGN_BITS);
rc_bittree_reverse(
- &coder->rc, coder->pos_align,
- ALIGN_BITS, pos_reduced & ALIGN_MASK);
+ &coder->rc, coder->dist_align,
+ ALIGN_BITS, dist_reduced & ALIGN_MASK);
++coder->align_price_count;
}
}
rc_bit(&coder->rc,
&coder->is_match[coder->state][pos_state], 1);
- if (back < REP_DISTANCES) {
+ if (back < REPS) {
// It's a repeated match i.e. the same distance
// has been used earlier.
rc_bit(&coder->rc, &coder->is_rep[coder->state], 1);
} else {
// Normal match
rc_bit(&coder->rc, &coder->is_rep[coder->state], 0);
- match(coder, pos_state, back - REP_DISTANCES, len);
+ match(coder, pos_state, back - REPS, len);
}
}
// Get optimal match (repeat position and length).
// Value ranges for pos:
- // - [0, REP_DISTANCES): repeated match
- // - [REP_DISTANCES, UINT32_MAX):
- // match at (pos - REP_DISTANCES)
+ // - [0, REPS): repeated match
+ // - [REPS, UINT32_MAX):
+ // match at (pos - REPS)
// - UINT32_MAX: not a match but a literal
// Value ranges for len:
// - [MATCH_LEN_MIN, MATCH_LEN_MAX]
// State
coder->state = STATE_LIT_LIT;
- for (size_t i = 0; i < REP_DISTANCES; ++i)
+ for (size_t i = 0; i < REPS; ++i)
coder->reps[i] = 0;
literal_init(coder->literal, options->lc, options->lp);
bit_reset(coder->is_rep2[i]);
}
- for (size_t i = 0; i < FULL_DISTANCES - END_POS_MODEL_INDEX; ++i)
- bit_reset(coder->pos_special[i]);
+ for (size_t i = 0; i < FULL_DISTANCES - DIST_MODEL_END; ++i)
+ bit_reset(coder->dist_special[i]);
// Bit tree encoders
- for (size_t i = 0; i < LEN_TO_POS_STATES; ++i)
- bittree_reset(coder->pos_slot[i], POS_SLOT_BITS);
+ for (size_t i = 0; i < DIST_STATES; ++i)
+ bittree_reset(coder->dist_slot[i], DIST_SLOT_BITS);
- bittree_reset(coder->pos_align, ALIGN_BITS);
+ bittree_reset(coder->dist_align, ALIGN_BITS);
// Length encoders
length_encoder_reset(&coder->match_len_encoder,
uint32_t rep_len = 0;
uint32_t rep_index = 0;
- for (uint32_t i = 0; i < REP_DISTANCES; ++i) {
+ for (uint32_t i = 0; i < REPS; ++i) {
// Pointer to the beginning of the match candidate
const uint8_t *const buf_back = buf - coder->reps[i] - 1;
// We didn't find a long enough repeated match. Encode it as a normal
// match if the match length is at least nice_len.
if (len_main >= nice_len) {
- *back_res = coder->matches[matches_count - 1].dist
- + REP_DISTANCES;
+ *back_res = coder->matches[matches_count - 1].dist + REPS;
*len_res = len_main;
mf_skip(mf, len_main - 1);
return;
const uint32_t limit = len_main - 1;
- for (uint32_t i = 0; i < REP_DISTANCES; ++i) {
+ for (uint32_t i = 0; i < REPS; ++i) {
const uint8_t *const buf_back = buf - coder->reps[i] - 1;
if (not_equal_16(buf, buf_back))
}
}
- *back_res = back_main + REP_DISTANCES;
+ *back_res = back_main + REPS;
*len_res = len_main;
mf_skip(mf, len_main - 2);
return;
static inline uint32_t
-get_pos_len_price(const lzma_coder *const coder, const uint32_t pos,
+get_dist_len_price(const lzma_coder *const coder, const uint32_t dist,
const uint32_t len, const uint32_t pos_state)
{
- const uint32_t len_to_pos_state = get_len_to_pos_state(len);
+ const uint32_t dist_state = get_dist_state(len);
uint32_t price;
- if (pos < FULL_DISTANCES) {
- price = coder->distances_prices[len_to_pos_state][pos];
+ if (dist < FULL_DISTANCES) {
+ price = coder->dist_prices[dist_state][dist];
} 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];
+ const uint32_t dist_slot = get_dist_slot_2(dist);
+ price = coder->dist_slot_prices[dist_state][dist_slot]
+ + coder->align_prices[dist & ALIGN_MASK];
}
price += get_len_price(&coder->match_len_encoder, len, pos_state);
static void
-fill_distances_prices(lzma_coder *coder)
+fill_dist_prices(lzma_coder *coder)
{
- for (uint32_t len_to_pos_state = 0;
- len_to_pos_state < LEN_TO_POS_STATES;
- ++len_to_pos_state) {
+ for (uint32_t dist_state = 0; dist_state < DIST_STATES; ++dist_state) {
- uint32_t *const pos_slot_prices
- = coder->pos_slot_prices[len_to_pos_state];
+ uint32_t *const dist_slot_prices
+ = coder->dist_slot_prices[dist_state];
- // Price to encode the pos_slot.
- for (uint32_t pos_slot = 0;
- pos_slot < coder->dist_table_size; ++pos_slot)
- pos_slot_prices[pos_slot] = rc_bittree_price(
- coder->pos_slot[len_to_pos_state],
- POS_SLOT_BITS, pos_slot);
+ // Price to encode the dist_slot.
+ for (uint32_t dist_slot = 0;
+ dist_slot < coder->dist_table_size; ++dist_slot)
+ dist_slot_prices[dist_slot] = rc_bittree_price(
+ coder->dist_slot[dist_state],
+ DIST_SLOT_BITS, dist_slot);
// For matches with distance >= FULL_DISTANCES, add the price
// of the direct bits part of the match distance. (Align bits
// are handled by fill_align_prices()).
- for (uint32_t pos_slot = END_POS_MODEL_INDEX;
- pos_slot < coder->dist_table_size; ++pos_slot)
- pos_slot_prices[pos_slot] += rc_direct_price(
- ((pos_slot >> 1) - 1) - ALIGN_BITS);
+ for (uint32_t dist_slot = DIST_MODEL_END;
+ dist_slot < coder->dist_table_size;
+ ++dist_slot)
+ dist_slot_prices[dist_slot] += rc_direct_price(
+ ((dist_slot >> 1) - 1) - ALIGN_BITS);
// Distances in the range [0, 3] are fully encoded with
- // pos_slot, so they are used for coder->distances_prices
+ // dist_slot, so they are used for coder->dist_prices
// as is.
- for (uint32_t i = 0; i < START_POS_MODEL_INDEX; ++i)
- coder->distances_prices[len_to_pos_state][i]
- = pos_slot_prices[i];
+ for (uint32_t i = 0; i < DIST_MODEL_START; ++i)
+ coder->dist_prices[dist_state][i]
+ = dist_slot_prices[i];
}
- // Distances in the range [4, 127] depend on pos_slot and pos_special.
- // We do this in a loop separate from the above loop to avoid
- // redundant calls to get_pos_slot().
- for (uint32_t i = START_POS_MODEL_INDEX; i < FULL_DISTANCES; ++i) {
- const uint32_t pos_slot = get_pos_slot(i);
- const uint32_t footer_bits = ((pos_slot >> 1) - 1);
- const uint32_t base = (2 | (pos_slot & 1)) << footer_bits;
+ // Distances in the range [4, 127] depend on dist_slot and
+ // dist_special. We do this in a loop separate from the above
+ // loop to avoid redundant calls to get_dist_slot().
+ for (uint32_t i = DIST_MODEL_START; i < FULL_DISTANCES; ++i) {
+ const uint32_t dist_slot = get_dist_slot(i);
+ const uint32_t footer_bits = ((dist_slot >> 1) - 1);
+ const uint32_t base = (2 | (dist_slot & 1)) << footer_bits;
const uint32_t price = rc_bittree_reverse_price(
- coder->pos_special + base - pos_slot - 1,
+ coder->dist_special + base - dist_slot - 1,
footer_bits, i - base);
- for (uint32_t len_to_pos_state = 0;
- len_to_pos_state < LEN_TO_POS_STATES;
- ++len_to_pos_state)
- coder->distances_prices[len_to_pos_state][i]
- = price + coder->pos_slot_prices[
- len_to_pos_state][pos_slot];
+ for (uint32_t dist_state = 0; dist_state < DIST_STATES;
+ ++dist_state)
+ coder->dist_prices[dist_state][i]
+ = price + coder->dist_slot_prices[
+ dist_state][dist_slot];
}
coder->match_price_count = 0;
static void
fill_align_prices(lzma_coder *coder)
{
- for (uint32_t i = 0; i < ALIGN_TABLE_SIZE; ++i)
+ for (uint32_t i = 0; i < ALIGN_SIZE; ++i)
coder->align_prices[i] = rc_bittree_reverse_price(
- coder->pos_align, ALIGN_BITS, i);
+ coder->dist_align, ALIGN_BITS, i);
coder->align_price_count = 0;
return;
const uint8_t *const buf = mf_ptr(mf) - 1;
- uint32_t rep_lens[REP_DISTANCES];
+ uint32_t rep_lens[REPS];
uint32_t rep_max_index = 0;
- for (uint32_t i = 0; i < REP_DISTANCES; ++i) {
+ for (uint32_t i = 0; i < REPS; ++i) {
const uint8_t *const buf_back = buf - coder->reps[i] - 1;
if (not_equal_16(buf, buf_back)) {
if (len_main >= nice_len) {
- *back_res = coder->matches[matches_count - 1].dist
- + REP_DISTANCES;
+ *back_res = coder->matches[matches_count - 1].dist + REPS;
*len_res = len_main;
mf_skip(mf, len_main - 1);
return UINT32_MAX;
coder->opts[1].pos_prev = 0;
- for (uint32_t i = 0; i < REP_DISTANCES; ++i)
+ for (uint32_t i = 0; i < REPS; ++i)
coder->opts[0].backs[i] = coder->reps[i];
uint32_t len = len_end;
} while (--len >= 2);
- for (uint32_t i = 0; i < REP_DISTANCES; ++i) {
+ for (uint32_t i = 0; i < REPS; ++i) {
uint32_t rep_len = rep_lens[i];
if (rep_len < 2)
continue;
for(; ; ++len) {
const uint32_t dist = coder->matches[i].dist;
const uint32_t cur_and_len_price = normal_match_price
- + get_pos_len_price(coder,
+ + get_dist_len_price(coder,
dist, len, pos_state);
if (cur_and_len_price < coder->opts[len].price) {
coder->opts[len].price = cur_and_len_price;
coder->opts[len].pos_prev = 0;
- coder->opts[len].back_prev
- = dist + REP_DISTANCES;
+ coder->opts[len].back_prev = dist + REPS;
coder->opts[len].prev_1_is_literal = false;
}
if (coder->opts[cur].prev_2) {
state = coder->opts[coder->opts[cur].pos_prev_2].state;
- if (coder->opts[cur].back_prev_2 < REP_DISTANCES)
+ if (coder->opts[cur].back_prev_2 < REPS)
update_long_rep(state);
else
update_match(state);
update_long_rep(state);
} else {
pos = coder->opts[cur].back_prev;
- if (pos < REP_DISTANCES)
+ if (pos < REPS)
update_long_rep(state);
else
update_match(state);
}
- if (pos < REP_DISTANCES) {
+ if (pos < REPS) {
reps[0] = coder->opts[pos_prev].backs[pos];
uint32_t i;
for (i = 1; i <= pos; ++i)
reps[i] = coder->opts[pos_prev].backs[i - 1];
- for (; i < REP_DISTANCES; ++i)
+ for (; i < REPS; ++i)
reps[i] = coder->opts[pos_prev].backs[i];
} else {
- reps[0] = pos - REP_DISTANCES;
+ reps[0] = pos - REPS;
- for (uint32_t i = 1; i < REP_DISTANCES; ++i)
+ for (uint32_t i = 1; i < REPS; ++i)
reps[i] = coder->opts[pos_prev].backs[i - 1];
}
}
coder->opts[cur].state = state;
- for (uint32_t i = 0; i < REP_DISTANCES; ++i)
+ for (uint32_t i = 0; i < REPS; ++i)
coder->opts[cur].backs[i] = reps[i];
const uint32_t cur_price = coder->opts[cur].price;
uint32_t start_len = 2; // speed optimization
- for (uint32_t rep_index = 0; rep_index < REP_DISTANCES; ++rep_index) {
+ for (uint32_t rep_index = 0; rep_index < REPS; ++rep_index) {
const uint8_t *const buf_back = buf - reps[rep_index] - 1;
if (not_equal_16(buf, buf_back))
continue;
for (uint32_t len_test = start_len; ; ++len_test) {
const uint32_t cur_back = coder->matches[i].dist;
uint32_t cur_and_len_price = normal_match_price
- + get_pos_len_price(coder,
+ + get_dist_len_price(coder,
cur_back, len_test, pos_state);
if (cur_and_len_price < coder->opts[cur + len_test].price) {
coder->opts[cur + len_test].price = cur_and_len_price;
coder->opts[cur + len_test].pos_prev = cur;
coder->opts[cur + len_test].back_prev
- = cur_back + REP_DISTANCES;
+ = cur_back + REPS;
coder->opts[cur + len_test].prev_1_is_literal = false;
}
coder->opts[offset].prev_2 = true;
coder->opts[offset].pos_prev_2 = cur;
coder->opts[offset].back_prev_2
- = cur_back + REP_DISTANCES;
+ = cur_back + REPS;
}
//}
}
// In liblzma they were moved into this single place.
if (mf->read_ahead == 0) {
if (coder->match_price_count >= (1 << 7))
- fill_distances_prices(coder);
+ fill_dist_prices(coder);
- if (coder->align_price_count >= ALIGN_TABLE_SIZE)
+ if (coder->align_price_count >= ALIGN_SIZE)
fill_align_prices(coder);
}
if (len_end == UINT32_MAX)
return;
- uint32_t reps[REP_DISTANCES];
+ uint32_t reps[REPS];
memcpy(reps, coder->reps, sizeof(reps));
uint32_t cur;
uint32_t pos_prev; // pos_next;
uint32_t back_prev;
- uint32_t backs[REP_DISTANCES];
+ uint32_t backs[REPS];
} lzma_optimal;
lzma_lzma_state state;
/// The four most recent match distances
- uint32_t reps[REP_DISTANCES];
+ uint32_t reps[REPS];
/// Array of match candidates
lzma_match matches[MATCH_LEN_MAX + 1];
probability is_rep1[STATES];
probability is_rep2[STATES];
probability is_rep0_long[STATES][POS_STATES_MAX];
- probability pos_slot[LEN_TO_POS_STATES][POS_SLOTS];
- probability pos_special[FULL_DISTANCES - END_POS_MODEL_INDEX];
- probability pos_align[ALIGN_TABLE_SIZE];
+ probability dist_slot[DIST_STATES][DIST_SLOTS];
+ probability dist_special[FULL_DISTANCES - DIST_MODEL_END];
+ probability dist_align[ALIGN_SIZE];
// These are the same as in lzma_decoder.c except that the encoders
// include also price tables.
lzma_length_encoder rep_len_encoder;
// Price tables
- uint32_t pos_slot_prices[LEN_TO_POS_STATES][POS_SLOTS];
- uint32_t distances_prices[LEN_TO_POS_STATES][FULL_DISTANCES];
+ uint32_t dist_slot_prices[DIST_STATES][DIST_SLOTS];
+ uint32_t dist_prices[DIST_STATES][FULL_DISTANCES];
uint32_t dist_table_size;
uint32_t match_price_count;
- uint32_t align_prices[ALIGN_TABLE_SIZE];
+ uint32_t align_prices[ALIGN_SIZE];
uint32_t align_price_count;
// Optimal
projects / platform / upstream / xz.git / commitdiff