1207753Smm/////////////////////////////////////////////////////////////////////////////// 2207753Smm// 3207753Smm/// \file lzma_encoder_optimum_normal.c 4207753Smm// 5207753Smm// Author: Igor Pavlov 6207753Smm// 7207753Smm// This file has been put into the public domain. 8207753Smm// You can do whatever you want with this file. 9207753Smm// 10207753Smm/////////////////////////////////////////////////////////////////////////////// 11207753Smm 12207753Smm#include "lzma_encoder_private.h" 13207753Smm#include "fastpos.h" 14292588Sdelphij#include "memcmplen.h" 15207753Smm 16207753Smm 17207753Smm//////////// 18207753Smm// Prices // 19207753Smm//////////// 20207753Smm 21207753Smmstatic uint32_t 22312518Sdelphijget_literal_price(const lzma_lzma1_encoder *const coder, const uint32_t pos, 23207753Smm const uint32_t prev_byte, const bool match_mode, 24207753Smm uint32_t match_byte, uint32_t symbol) 25207753Smm{ 26207753Smm const probability *const subcoder = literal_subcoder(coder->literal, 27207753Smm coder->literal_context_bits, coder->literal_pos_mask, 28207753Smm pos, prev_byte); 29207753Smm 30207753Smm uint32_t price = 0; 31207753Smm 32207753Smm if (!match_mode) { 33207753Smm price = rc_bittree_price(subcoder, 8, symbol); 34207753Smm } else { 35207753Smm uint32_t offset = 0x100; 36207753Smm symbol += UINT32_C(1) << 8; 37207753Smm 38207753Smm do { 39207753Smm match_byte <<= 1; 40207753Smm 41207753Smm const uint32_t match_bit = match_byte & offset; 42207753Smm const uint32_t subcoder_index 43207753Smm = offset + match_bit + (symbol >> 8); 44207753Smm const uint32_t bit = (symbol >> 7) & 1; 45207753Smm price += rc_bit_price(subcoder[subcoder_index], bit); 46207753Smm 47207753Smm symbol <<= 1; 48207753Smm offset &= ~(match_byte ^ symbol); 49207753Smm 50207753Smm } while (symbol < (UINT32_C(1) << 16)); 51207753Smm } 52207753Smm 53207753Smm return price; 54207753Smm} 55207753Smm 56207753Smm 57207753Smmstatic inline uint32_t 58207753Smmget_len_price(const lzma_length_encoder *const lencoder, 59207753Smm const uint32_t len, const uint32_t pos_state) 60207753Smm{ 61207753Smm // NOTE: Unlike the other price tables, length prices are updated 62207753Smm // in lzma_encoder.c 63207753Smm return lencoder->prices[pos_state][len - MATCH_LEN_MIN]; 64207753Smm} 65207753Smm 66207753Smm 67207753Smmstatic inline uint32_t 68312518Sdelphijget_short_rep_price(const lzma_lzma1_encoder *const coder, 69207753Smm const lzma_lzma_state state, const uint32_t pos_state) 70207753Smm{ 71207753Smm return rc_bit_0_price(coder->is_rep0[state]) 72207753Smm + rc_bit_0_price(coder->is_rep0_long[state][pos_state]); 73207753Smm} 74207753Smm 75207753Smm 76207753Smmstatic inline uint32_t 77312518Sdelphijget_pure_rep_price(const lzma_lzma1_encoder *const coder, const uint32_t rep_index, 78207753Smm const lzma_lzma_state state, uint32_t pos_state) 79207753Smm{ 80207753Smm uint32_t price; 81207753Smm 82207753Smm if (rep_index == 0) { 83207753Smm price = rc_bit_0_price(coder->is_rep0[state]); 84207753Smm price += rc_bit_1_price(coder->is_rep0_long[state][pos_state]); 85207753Smm } else { 86207753Smm price = rc_bit_1_price(coder->is_rep0[state]); 87207753Smm 88207753Smm if (rep_index == 1) { 89207753Smm price += rc_bit_0_price(coder->is_rep1[state]); 90207753Smm } else { 91207753Smm price += rc_bit_1_price(coder->is_rep1[state]); 92207753Smm price += rc_bit_price(coder->is_rep2[state], 93207753Smm rep_index - 2); 94207753Smm } 95207753Smm } 96207753Smm 97207753Smm return price; 98207753Smm} 99207753Smm 100207753Smm 101207753Smmstatic inline uint32_t 102312518Sdelphijget_rep_price(const lzma_lzma1_encoder *const coder, const uint32_t rep_index, 103207753Smm const uint32_t len, const lzma_lzma_state state, 104207753Smm const uint32_t pos_state) 105207753Smm{ 106207753Smm return get_len_price(&coder->rep_len_encoder, len, pos_state) 107207753Smm + get_pure_rep_price(coder, rep_index, state, pos_state); 108207753Smm} 109207753Smm 110207753Smm 111207753Smmstatic inline uint32_t 112312518Sdelphijget_dist_len_price(const lzma_lzma1_encoder *const coder, const uint32_t dist, 113207753Smm const uint32_t len, const uint32_t pos_state) 114207753Smm{ 115292588Sdelphij const uint32_t dist_state = get_dist_state(len); 116207753Smm uint32_t price; 117207753Smm 118292588Sdelphij if (dist < FULL_DISTANCES) { 119292588Sdelphij price = coder->dist_prices[dist_state][dist]; 120207753Smm } else { 121292588Sdelphij const uint32_t dist_slot = get_dist_slot_2(dist); 122292588Sdelphij price = coder->dist_slot_prices[dist_state][dist_slot] 123292588Sdelphij + coder->align_prices[dist & ALIGN_MASK]; 124207753Smm } 125207753Smm 126207753Smm price += get_len_price(&coder->match_len_encoder, len, pos_state); 127207753Smm 128207753Smm return price; 129207753Smm} 130207753Smm 131207753Smm 132207753Smmstatic void 133312518Sdelphijfill_dist_prices(lzma_lzma1_encoder *coder) 134207753Smm{ 135292588Sdelphij for (uint32_t dist_state = 0; dist_state < DIST_STATES; ++dist_state) { 136207753Smm 137292588Sdelphij uint32_t *const dist_slot_prices 138292588Sdelphij = coder->dist_slot_prices[dist_state]; 139207753Smm 140292588Sdelphij // Price to encode the dist_slot. 141292588Sdelphij for (uint32_t dist_slot = 0; 142292588Sdelphij dist_slot < coder->dist_table_size; ++dist_slot) 143292588Sdelphij dist_slot_prices[dist_slot] = rc_bittree_price( 144292588Sdelphij coder->dist_slot[dist_state], 145292588Sdelphij DIST_SLOT_BITS, dist_slot); 146207753Smm 147207753Smm // For matches with distance >= FULL_DISTANCES, add the price 148207753Smm // of the direct bits part of the match distance. (Align bits 149207753Smm // are handled by fill_align_prices()). 150292588Sdelphij for (uint32_t dist_slot = DIST_MODEL_END; 151292588Sdelphij dist_slot < coder->dist_table_size; 152292588Sdelphij ++dist_slot) 153292588Sdelphij dist_slot_prices[dist_slot] += rc_direct_price( 154292588Sdelphij ((dist_slot >> 1) - 1) - ALIGN_BITS); 155207753Smm 156207753Smm // Distances in the range [0, 3] are fully encoded with 157292588Sdelphij // dist_slot, so they are used for coder->dist_prices 158207753Smm // as is. 159292588Sdelphij for (uint32_t i = 0; i < DIST_MODEL_START; ++i) 160292588Sdelphij coder->dist_prices[dist_state][i] 161292588Sdelphij = dist_slot_prices[i]; 162207753Smm } 163207753Smm 164292588Sdelphij // Distances in the range [4, 127] depend on dist_slot and 165292588Sdelphij // dist_special. We do this in a loop separate from the above 166292588Sdelphij // loop to avoid redundant calls to get_dist_slot(). 167292588Sdelphij for (uint32_t i = DIST_MODEL_START; i < FULL_DISTANCES; ++i) { 168292588Sdelphij const uint32_t dist_slot = get_dist_slot(i); 169292588Sdelphij const uint32_t footer_bits = ((dist_slot >> 1) - 1); 170292588Sdelphij const uint32_t base = (2 | (dist_slot & 1)) << footer_bits; 171207753Smm const uint32_t price = rc_bittree_reverse_price( 172292588Sdelphij coder->dist_special + base - dist_slot - 1, 173207753Smm footer_bits, i - base); 174207753Smm 175292588Sdelphij for (uint32_t dist_state = 0; dist_state < DIST_STATES; 176292588Sdelphij ++dist_state) 177292588Sdelphij coder->dist_prices[dist_state][i] 178292588Sdelphij = price + coder->dist_slot_prices[ 179292588Sdelphij dist_state][dist_slot]; 180207753Smm } 181207753Smm 182207753Smm coder->match_price_count = 0; 183207753Smm return; 184207753Smm} 185207753Smm 186207753Smm 187207753Smmstatic void 188312518Sdelphijfill_align_prices(lzma_lzma1_encoder *coder) 189207753Smm{ 190292588Sdelphij for (uint32_t i = 0; i < ALIGN_SIZE; ++i) 191207753Smm coder->align_prices[i] = rc_bittree_reverse_price( 192292588Sdelphij coder->dist_align, ALIGN_BITS, i); 193207753Smm 194207753Smm coder->align_price_count = 0; 195207753Smm return; 196207753Smm} 197207753Smm 198207753Smm 199207753Smm///////////// 200207753Smm// Optimal // 201207753Smm///////////// 202207753Smm 203207753Smmstatic inline void 204207753Smmmake_literal(lzma_optimal *optimal) 205207753Smm{ 206207753Smm optimal->back_prev = UINT32_MAX; 207207753Smm optimal->prev_1_is_literal = false; 208207753Smm} 209207753Smm 210207753Smm 211207753Smmstatic inline void 212207753Smmmake_short_rep(lzma_optimal *optimal) 213207753Smm{ 214207753Smm optimal->back_prev = 0; 215207753Smm optimal->prev_1_is_literal = false; 216207753Smm} 217207753Smm 218207753Smm 219207753Smm#define is_short_rep(optimal) \ 220207753Smm ((optimal).back_prev == 0) 221207753Smm 222207753Smm 223207753Smmstatic void 224312518Sdelphijbackward(lzma_lzma1_encoder *restrict coder, uint32_t *restrict len_res, 225207753Smm uint32_t *restrict back_res, uint32_t cur) 226207753Smm{ 227207753Smm coder->opts_end_index = cur; 228207753Smm 229207753Smm uint32_t pos_mem = coder->opts[cur].pos_prev; 230207753Smm uint32_t back_mem = coder->opts[cur].back_prev; 231207753Smm 232207753Smm do { 233207753Smm if (coder->opts[cur].prev_1_is_literal) { 234207753Smm make_literal(&coder->opts[pos_mem]); 235207753Smm coder->opts[pos_mem].pos_prev = pos_mem - 1; 236207753Smm 237207753Smm if (coder->opts[cur].prev_2) { 238207753Smm coder->opts[pos_mem - 1].prev_1_is_literal 239207753Smm = false; 240207753Smm coder->opts[pos_mem - 1].pos_prev 241207753Smm = coder->opts[cur].pos_prev_2; 242207753Smm coder->opts[pos_mem - 1].back_prev 243207753Smm = coder->opts[cur].back_prev_2; 244207753Smm } 245207753Smm } 246207753Smm 247207753Smm const uint32_t pos_prev = pos_mem; 248207753Smm const uint32_t back_cur = back_mem; 249207753Smm 250207753Smm back_mem = coder->opts[pos_prev].back_prev; 251207753Smm pos_mem = coder->opts[pos_prev].pos_prev; 252207753Smm 253207753Smm coder->opts[pos_prev].back_prev = back_cur; 254207753Smm coder->opts[pos_prev].pos_prev = cur; 255207753Smm cur = pos_prev; 256207753Smm 257207753Smm } while (cur != 0); 258207753Smm 259207753Smm coder->opts_current_index = coder->opts[0].pos_prev; 260207753Smm *len_res = coder->opts[0].pos_prev; 261207753Smm *back_res = coder->opts[0].back_prev; 262207753Smm 263207753Smm return; 264207753Smm} 265207753Smm 266207753Smm 267207753Smm////////// 268207753Smm// Main // 269207753Smm////////// 270207753Smm 271207753Smmstatic inline uint32_t 272312518Sdelphijhelper1(lzma_lzma1_encoder *restrict coder, lzma_mf *restrict mf, 273207753Smm uint32_t *restrict back_res, uint32_t *restrict len_res, 274207753Smm uint32_t position) 275207753Smm{ 276207753Smm const uint32_t nice_len = mf->nice_len; 277207753Smm 278207753Smm uint32_t len_main; 279207753Smm uint32_t matches_count; 280207753Smm 281207753Smm if (mf->read_ahead == 0) { 282207753Smm len_main = mf_find(mf, &matches_count, coder->matches); 283207753Smm } else { 284207753Smm assert(mf->read_ahead == 1); 285207753Smm len_main = coder->longest_match_length; 286207753Smm matches_count = coder->matches_count; 287207753Smm } 288207753Smm 289213700Smm const uint32_t buf_avail = my_min(mf_avail(mf) + 1, MATCH_LEN_MAX); 290207753Smm if (buf_avail < 2) { 291207753Smm *back_res = UINT32_MAX; 292207753Smm *len_res = 1; 293207753Smm return UINT32_MAX; 294207753Smm } 295207753Smm 296207753Smm const uint8_t *const buf = mf_ptr(mf) - 1; 297207753Smm 298292588Sdelphij uint32_t rep_lens[REPS]; 299207753Smm uint32_t rep_max_index = 0; 300207753Smm 301292588Sdelphij for (uint32_t i = 0; i < REPS; ++i) { 302207753Smm const uint8_t *const buf_back = buf - coder->reps[i] - 1; 303207753Smm 304207753Smm if (not_equal_16(buf, buf_back)) { 305207753Smm rep_lens[i] = 0; 306207753Smm continue; 307207753Smm } 308207753Smm 309292588Sdelphij rep_lens[i] = lzma_memcmplen(buf, buf_back, 2, buf_avail); 310207753Smm 311292588Sdelphij if (rep_lens[i] > rep_lens[rep_max_index]) 312207753Smm rep_max_index = i; 313207753Smm } 314207753Smm 315207753Smm if (rep_lens[rep_max_index] >= nice_len) { 316207753Smm *back_res = rep_max_index; 317207753Smm *len_res = rep_lens[rep_max_index]; 318207753Smm mf_skip(mf, *len_res - 1); 319207753Smm return UINT32_MAX; 320207753Smm } 321207753Smm 322207753Smm 323207753Smm if (len_main >= nice_len) { 324292588Sdelphij *back_res = coder->matches[matches_count - 1].dist + REPS; 325207753Smm *len_res = len_main; 326207753Smm mf_skip(mf, len_main - 1); 327207753Smm return UINT32_MAX; 328207753Smm } 329207753Smm 330207753Smm const uint8_t current_byte = *buf; 331207753Smm const uint8_t match_byte = *(buf - coder->reps[0] - 1); 332207753Smm 333207753Smm if (len_main < 2 && current_byte != match_byte 334207753Smm && rep_lens[rep_max_index] < 2) { 335207753Smm *back_res = UINT32_MAX; 336207753Smm *len_res = 1; 337207753Smm return UINT32_MAX; 338207753Smm } 339207753Smm 340207753Smm coder->opts[0].state = coder->state; 341207753Smm 342207753Smm const uint32_t pos_state = position & coder->pos_mask; 343207753Smm 344207753Smm coder->opts[1].price = rc_bit_0_price( 345207753Smm coder->is_match[coder->state][pos_state]) 346207753Smm + get_literal_price(coder, position, buf[-1], 347207753Smm !is_literal_state(coder->state), 348207753Smm match_byte, current_byte); 349207753Smm 350207753Smm make_literal(&coder->opts[1]); 351207753Smm 352207753Smm const uint32_t match_price = rc_bit_1_price( 353207753Smm coder->is_match[coder->state][pos_state]); 354207753Smm const uint32_t rep_match_price = match_price 355207753Smm + rc_bit_1_price(coder->is_rep[coder->state]); 356207753Smm 357207753Smm if (match_byte == current_byte) { 358207753Smm const uint32_t short_rep_price = rep_match_price 359207753Smm + get_short_rep_price( 360207753Smm coder, coder->state, pos_state); 361207753Smm 362207753Smm if (short_rep_price < coder->opts[1].price) { 363207753Smm coder->opts[1].price = short_rep_price; 364207753Smm make_short_rep(&coder->opts[1]); 365207753Smm } 366207753Smm } 367207753Smm 368213700Smm const uint32_t len_end = my_max(len_main, rep_lens[rep_max_index]); 369207753Smm 370207753Smm if (len_end < 2) { 371207753Smm *back_res = coder->opts[1].back_prev; 372207753Smm *len_res = 1; 373207753Smm return UINT32_MAX; 374207753Smm } 375207753Smm 376207753Smm coder->opts[1].pos_prev = 0; 377207753Smm 378292588Sdelphij for (uint32_t i = 0; i < REPS; ++i) 379207753Smm coder->opts[0].backs[i] = coder->reps[i]; 380207753Smm 381207753Smm uint32_t len = len_end; 382207753Smm do { 383207753Smm coder->opts[len].price = RC_INFINITY_PRICE; 384207753Smm } while (--len >= 2); 385207753Smm 386207753Smm 387292588Sdelphij for (uint32_t i = 0; i < REPS; ++i) { 388207753Smm uint32_t rep_len = rep_lens[i]; 389207753Smm if (rep_len < 2) 390207753Smm continue; 391207753Smm 392207753Smm const uint32_t price = rep_match_price + get_pure_rep_price( 393207753Smm coder, i, coder->state, pos_state); 394207753Smm 395207753Smm do { 396207753Smm const uint32_t cur_and_len_price = price 397207753Smm + get_len_price( 398207753Smm &coder->rep_len_encoder, 399207753Smm rep_len, pos_state); 400207753Smm 401207753Smm if (cur_and_len_price < coder->opts[rep_len].price) { 402207753Smm coder->opts[rep_len].price = cur_and_len_price; 403207753Smm coder->opts[rep_len].pos_prev = 0; 404207753Smm coder->opts[rep_len].back_prev = i; 405207753Smm coder->opts[rep_len].prev_1_is_literal = false; 406207753Smm } 407207753Smm } while (--rep_len >= 2); 408207753Smm } 409207753Smm 410207753Smm 411207753Smm const uint32_t normal_match_price = match_price 412207753Smm + rc_bit_0_price(coder->is_rep[coder->state]); 413207753Smm 414207753Smm len = rep_lens[0] >= 2 ? rep_lens[0] + 1 : 2; 415207753Smm if (len <= len_main) { 416207753Smm uint32_t i = 0; 417207753Smm while (len > coder->matches[i].len) 418207753Smm ++i; 419207753Smm 420207753Smm for(; ; ++len) { 421207753Smm const uint32_t dist = coder->matches[i].dist; 422207753Smm const uint32_t cur_and_len_price = normal_match_price 423292588Sdelphij + get_dist_len_price(coder, 424207753Smm dist, len, pos_state); 425207753Smm 426207753Smm if (cur_and_len_price < coder->opts[len].price) { 427207753Smm coder->opts[len].price = cur_and_len_price; 428207753Smm coder->opts[len].pos_prev = 0; 429292588Sdelphij coder->opts[len].back_prev = dist + REPS; 430207753Smm coder->opts[len].prev_1_is_literal = false; 431207753Smm } 432207753Smm 433207753Smm if (len == coder->matches[i].len) 434207753Smm if (++i == matches_count) 435207753Smm break; 436207753Smm } 437207753Smm } 438207753Smm 439207753Smm return len_end; 440207753Smm} 441207753Smm 442207753Smm 443207753Smmstatic inline uint32_t 444312518Sdelphijhelper2(lzma_lzma1_encoder *coder, uint32_t *reps, const uint8_t *buf, 445207753Smm uint32_t len_end, uint32_t position, const uint32_t cur, 446207753Smm const uint32_t nice_len, const uint32_t buf_avail_full) 447207753Smm{ 448207753Smm uint32_t matches_count = coder->matches_count; 449207753Smm uint32_t new_len = coder->longest_match_length; 450207753Smm uint32_t pos_prev = coder->opts[cur].pos_prev; 451207753Smm lzma_lzma_state state; 452207753Smm 453207753Smm if (coder->opts[cur].prev_1_is_literal) { 454207753Smm --pos_prev; 455207753Smm 456207753Smm if (coder->opts[cur].prev_2) { 457207753Smm state = coder->opts[coder->opts[cur].pos_prev_2].state; 458207753Smm 459292588Sdelphij if (coder->opts[cur].back_prev_2 < REPS) 460207753Smm update_long_rep(state); 461207753Smm else 462207753Smm update_match(state); 463207753Smm 464207753Smm } else { 465207753Smm state = coder->opts[pos_prev].state; 466207753Smm } 467207753Smm 468207753Smm update_literal(state); 469207753Smm 470207753Smm } else { 471207753Smm state = coder->opts[pos_prev].state; 472207753Smm } 473207753Smm 474207753Smm if (pos_prev == cur - 1) { 475207753Smm if (is_short_rep(coder->opts[cur])) 476207753Smm update_short_rep(state); 477207753Smm else 478207753Smm update_literal(state); 479207753Smm } else { 480207753Smm uint32_t pos; 481207753Smm if (coder->opts[cur].prev_1_is_literal 482207753Smm && coder->opts[cur].prev_2) { 483207753Smm pos_prev = coder->opts[cur].pos_prev_2; 484207753Smm pos = coder->opts[cur].back_prev_2; 485207753Smm update_long_rep(state); 486207753Smm } else { 487207753Smm pos = coder->opts[cur].back_prev; 488292588Sdelphij if (pos < REPS) 489207753Smm update_long_rep(state); 490207753Smm else 491207753Smm update_match(state); 492207753Smm } 493207753Smm 494292588Sdelphij if (pos < REPS) { 495207753Smm reps[0] = coder->opts[pos_prev].backs[pos]; 496207753Smm 497207753Smm uint32_t i; 498207753Smm for (i = 1; i <= pos; ++i) 499207753Smm reps[i] = coder->opts[pos_prev].backs[i - 1]; 500207753Smm 501292588Sdelphij for (; i < REPS; ++i) 502207753Smm reps[i] = coder->opts[pos_prev].backs[i]; 503207753Smm 504207753Smm } else { 505292588Sdelphij reps[0] = pos - REPS; 506207753Smm 507292588Sdelphij for (uint32_t i = 1; i < REPS; ++i) 508207753Smm reps[i] = coder->opts[pos_prev].backs[i - 1]; 509207753Smm } 510207753Smm } 511207753Smm 512207753Smm coder->opts[cur].state = state; 513207753Smm 514292588Sdelphij for (uint32_t i = 0; i < REPS; ++i) 515207753Smm coder->opts[cur].backs[i] = reps[i]; 516207753Smm 517207753Smm const uint32_t cur_price = coder->opts[cur].price; 518207753Smm 519207753Smm const uint8_t current_byte = *buf; 520207753Smm const uint8_t match_byte = *(buf - reps[0] - 1); 521207753Smm 522207753Smm const uint32_t pos_state = position & coder->pos_mask; 523207753Smm 524207753Smm const uint32_t cur_and_1_price = cur_price 525207753Smm + rc_bit_0_price(coder->is_match[state][pos_state]) 526207753Smm + get_literal_price(coder, position, buf[-1], 527207753Smm !is_literal_state(state), match_byte, current_byte); 528207753Smm 529207753Smm bool next_is_literal = false; 530207753Smm 531207753Smm if (cur_and_1_price < coder->opts[cur + 1].price) { 532207753Smm coder->opts[cur + 1].price = cur_and_1_price; 533207753Smm coder->opts[cur + 1].pos_prev = cur; 534207753Smm make_literal(&coder->opts[cur + 1]); 535207753Smm next_is_literal = true; 536207753Smm } 537207753Smm 538207753Smm const uint32_t match_price = cur_price 539207753Smm + rc_bit_1_price(coder->is_match[state][pos_state]); 540207753Smm const uint32_t rep_match_price = match_price 541207753Smm + rc_bit_1_price(coder->is_rep[state]); 542207753Smm 543207753Smm if (match_byte == current_byte 544207753Smm && !(coder->opts[cur + 1].pos_prev < cur 545207753Smm && coder->opts[cur + 1].back_prev == 0)) { 546207753Smm 547207753Smm const uint32_t short_rep_price = rep_match_price 548207753Smm + get_short_rep_price(coder, state, pos_state); 549207753Smm 550207753Smm if (short_rep_price <= coder->opts[cur + 1].price) { 551207753Smm coder->opts[cur + 1].price = short_rep_price; 552207753Smm coder->opts[cur + 1].pos_prev = cur; 553207753Smm make_short_rep(&coder->opts[cur + 1]); 554207753Smm next_is_literal = true; 555207753Smm } 556207753Smm } 557207753Smm 558207753Smm if (buf_avail_full < 2) 559207753Smm return len_end; 560207753Smm 561213700Smm const uint32_t buf_avail = my_min(buf_avail_full, nice_len); 562207753Smm 563207753Smm if (!next_is_literal && match_byte != current_byte) { // speed optimization 564207753Smm // try literal + rep0 565207753Smm const uint8_t *const buf_back = buf - reps[0] - 1; 566213700Smm const uint32_t limit = my_min(buf_avail_full, nice_len + 1); 567207753Smm 568292588Sdelphij const uint32_t len_test = lzma_memcmplen(buf, buf_back, 1, limit) - 1; 569207753Smm 570207753Smm if (len_test >= 2) { 571207753Smm lzma_lzma_state state_2 = state; 572207753Smm update_literal(state_2); 573207753Smm 574207753Smm const uint32_t pos_state_next = (position + 1) & coder->pos_mask; 575207753Smm const uint32_t next_rep_match_price = cur_and_1_price 576207753Smm + rc_bit_1_price(coder->is_match[state_2][pos_state_next]) 577207753Smm + rc_bit_1_price(coder->is_rep[state_2]); 578207753Smm 579207753Smm //for (; len_test >= 2; --len_test) { 580207753Smm const uint32_t offset = cur + 1 + len_test; 581207753Smm 582207753Smm while (len_end < offset) 583207753Smm coder->opts[++len_end].price = RC_INFINITY_PRICE; 584207753Smm 585207753Smm const uint32_t cur_and_len_price = next_rep_match_price 586207753Smm + get_rep_price(coder, 0, len_test, 587207753Smm state_2, pos_state_next); 588207753Smm 589207753Smm if (cur_and_len_price < coder->opts[offset].price) { 590207753Smm coder->opts[offset].price = cur_and_len_price; 591207753Smm coder->opts[offset].pos_prev = cur + 1; 592207753Smm coder->opts[offset].back_prev = 0; 593207753Smm coder->opts[offset].prev_1_is_literal = true; 594207753Smm coder->opts[offset].prev_2 = false; 595207753Smm } 596207753Smm //} 597207753Smm } 598207753Smm } 599207753Smm 600207753Smm 601207753Smm uint32_t start_len = 2; // speed optimization 602207753Smm 603292588Sdelphij for (uint32_t rep_index = 0; rep_index < REPS; ++rep_index) { 604207753Smm const uint8_t *const buf_back = buf - reps[rep_index] - 1; 605207753Smm if (not_equal_16(buf, buf_back)) 606207753Smm continue; 607207753Smm 608292588Sdelphij uint32_t len_test = lzma_memcmplen(buf, buf_back, 2, buf_avail); 609207753Smm 610207753Smm while (len_end < cur + len_test) 611207753Smm coder->opts[++len_end].price = RC_INFINITY_PRICE; 612207753Smm 613207753Smm const uint32_t len_test_temp = len_test; 614207753Smm const uint32_t price = rep_match_price + get_pure_rep_price( 615207753Smm coder, rep_index, state, pos_state); 616207753Smm 617207753Smm do { 618207753Smm const uint32_t cur_and_len_price = price 619207753Smm + get_len_price(&coder->rep_len_encoder, 620207753Smm len_test, pos_state); 621207753Smm 622207753Smm if (cur_and_len_price < coder->opts[cur + len_test].price) { 623207753Smm coder->opts[cur + len_test].price = cur_and_len_price; 624207753Smm coder->opts[cur + len_test].pos_prev = cur; 625207753Smm coder->opts[cur + len_test].back_prev = rep_index; 626207753Smm coder->opts[cur + len_test].prev_1_is_literal = false; 627207753Smm } 628207753Smm } while (--len_test >= 2); 629207753Smm 630207753Smm len_test = len_test_temp; 631207753Smm 632207753Smm if (rep_index == 0) 633207753Smm start_len = len_test + 1; 634207753Smm 635207753Smm 636207753Smm uint32_t len_test_2 = len_test + 1; 637213700Smm const uint32_t limit = my_min(buf_avail_full, 638207753Smm len_test_2 + nice_len); 639207753Smm for (; len_test_2 < limit 640207753Smm && buf[len_test_2] == buf_back[len_test_2]; 641207753Smm ++len_test_2) ; 642207753Smm 643207753Smm len_test_2 -= len_test + 1; 644207753Smm 645207753Smm if (len_test_2 >= 2) { 646207753Smm lzma_lzma_state state_2 = state; 647207753Smm update_long_rep(state_2); 648207753Smm 649207753Smm uint32_t pos_state_next = (position + len_test) & coder->pos_mask; 650207753Smm 651207753Smm const uint32_t cur_and_len_literal_price = price 652207753Smm + get_len_price(&coder->rep_len_encoder, 653207753Smm len_test, pos_state) 654207753Smm + rc_bit_0_price(coder->is_match[state_2][pos_state_next]) 655207753Smm + get_literal_price(coder, position + len_test, 656207753Smm buf[len_test - 1], true, 657207753Smm buf_back[len_test], buf[len_test]); 658207753Smm 659207753Smm update_literal(state_2); 660207753Smm 661207753Smm pos_state_next = (position + len_test + 1) & coder->pos_mask; 662207753Smm 663207753Smm const uint32_t next_rep_match_price = cur_and_len_literal_price 664207753Smm + rc_bit_1_price(coder->is_match[state_2][pos_state_next]) 665207753Smm + rc_bit_1_price(coder->is_rep[state_2]); 666207753Smm 667207753Smm //for(; len_test_2 >= 2; len_test_2--) { 668207753Smm const uint32_t offset = cur + len_test + 1 + len_test_2; 669207753Smm 670207753Smm while (len_end < offset) 671207753Smm coder->opts[++len_end].price = RC_INFINITY_PRICE; 672207753Smm 673207753Smm const uint32_t cur_and_len_price = next_rep_match_price 674207753Smm + get_rep_price(coder, 0, len_test_2, 675207753Smm state_2, pos_state_next); 676207753Smm 677207753Smm if (cur_and_len_price < coder->opts[offset].price) { 678207753Smm coder->opts[offset].price = cur_and_len_price; 679207753Smm coder->opts[offset].pos_prev = cur + len_test + 1; 680207753Smm coder->opts[offset].back_prev = 0; 681207753Smm coder->opts[offset].prev_1_is_literal = true; 682207753Smm coder->opts[offset].prev_2 = true; 683207753Smm coder->opts[offset].pos_prev_2 = cur; 684207753Smm coder->opts[offset].back_prev_2 = rep_index; 685207753Smm } 686207753Smm //} 687207753Smm } 688207753Smm } 689207753Smm 690207753Smm 691207753Smm //for (uint32_t len_test = 2; len_test <= new_len; ++len_test) 692207753Smm if (new_len > buf_avail) { 693207753Smm new_len = buf_avail; 694207753Smm 695207753Smm matches_count = 0; 696207753Smm while (new_len > coder->matches[matches_count].len) 697207753Smm ++matches_count; 698207753Smm 699207753Smm coder->matches[matches_count++].len = new_len; 700207753Smm } 701207753Smm 702207753Smm 703207753Smm if (new_len >= start_len) { 704207753Smm const uint32_t normal_match_price = match_price 705207753Smm + rc_bit_0_price(coder->is_rep[state]); 706207753Smm 707207753Smm while (len_end < cur + new_len) 708207753Smm coder->opts[++len_end].price = RC_INFINITY_PRICE; 709207753Smm 710207753Smm uint32_t i = 0; 711207753Smm while (start_len > coder->matches[i].len) 712207753Smm ++i; 713207753Smm 714207753Smm for (uint32_t len_test = start_len; ; ++len_test) { 715207753Smm const uint32_t cur_back = coder->matches[i].dist; 716207753Smm uint32_t cur_and_len_price = normal_match_price 717292588Sdelphij + get_dist_len_price(coder, 718207753Smm cur_back, len_test, pos_state); 719207753Smm 720207753Smm if (cur_and_len_price < coder->opts[cur + len_test].price) { 721207753Smm coder->opts[cur + len_test].price = cur_and_len_price; 722207753Smm coder->opts[cur + len_test].pos_prev = cur; 723207753Smm coder->opts[cur + len_test].back_prev 724292588Sdelphij = cur_back + REPS; 725207753Smm coder->opts[cur + len_test].prev_1_is_literal = false; 726207753Smm } 727207753Smm 728207753Smm if (len_test == coder->matches[i].len) { 729207753Smm // Try Match + Literal + Rep0 730207753Smm const uint8_t *const buf_back = buf - cur_back - 1; 731207753Smm uint32_t len_test_2 = len_test + 1; 732213700Smm const uint32_t limit = my_min(buf_avail_full, 733207753Smm len_test_2 + nice_len); 734207753Smm 735207753Smm for (; len_test_2 < limit && 736207753Smm buf[len_test_2] == buf_back[len_test_2]; 737207753Smm ++len_test_2) ; 738207753Smm 739207753Smm len_test_2 -= len_test + 1; 740207753Smm 741207753Smm if (len_test_2 >= 2) { 742207753Smm lzma_lzma_state state_2 = state; 743207753Smm update_match(state_2); 744207753Smm uint32_t pos_state_next 745207753Smm = (position + len_test) & coder->pos_mask; 746207753Smm 747207753Smm const uint32_t cur_and_len_literal_price = cur_and_len_price 748207753Smm + rc_bit_0_price( 749207753Smm coder->is_match[state_2][pos_state_next]) 750207753Smm + get_literal_price(coder, 751207753Smm position + len_test, 752207753Smm buf[len_test - 1], 753207753Smm true, 754207753Smm buf_back[len_test], 755207753Smm buf[len_test]); 756207753Smm 757207753Smm update_literal(state_2); 758207753Smm pos_state_next = (pos_state_next + 1) & coder->pos_mask; 759207753Smm 760207753Smm const uint32_t next_rep_match_price 761207753Smm = cur_and_len_literal_price 762207753Smm + rc_bit_1_price( 763207753Smm coder->is_match[state_2][pos_state_next]) 764207753Smm + rc_bit_1_price(coder->is_rep[state_2]); 765207753Smm 766207753Smm // for(; len_test_2 >= 2; --len_test_2) { 767207753Smm const uint32_t offset = cur + len_test + 1 + len_test_2; 768207753Smm 769207753Smm while (len_end < offset) 770207753Smm coder->opts[++len_end].price = RC_INFINITY_PRICE; 771207753Smm 772207753Smm cur_and_len_price = next_rep_match_price 773207753Smm + get_rep_price(coder, 0, len_test_2, 774207753Smm state_2, pos_state_next); 775207753Smm 776207753Smm if (cur_and_len_price < coder->opts[offset].price) { 777207753Smm coder->opts[offset].price = cur_and_len_price; 778207753Smm coder->opts[offset].pos_prev = cur + len_test + 1; 779207753Smm coder->opts[offset].back_prev = 0; 780207753Smm coder->opts[offset].prev_1_is_literal = true; 781207753Smm coder->opts[offset].prev_2 = true; 782207753Smm coder->opts[offset].pos_prev_2 = cur; 783207753Smm coder->opts[offset].back_prev_2 784292588Sdelphij = cur_back + REPS; 785207753Smm } 786207753Smm //} 787207753Smm } 788207753Smm 789207753Smm if (++i == matches_count) 790207753Smm break; 791207753Smm } 792207753Smm } 793207753Smm } 794207753Smm 795207753Smm return len_end; 796207753Smm} 797207753Smm 798207753Smm 799207753Smmextern void 800312518Sdelphijlzma_lzma_optimum_normal(lzma_lzma1_encoder *restrict coder, 801312518Sdelphij lzma_mf *restrict mf, 802207753Smm uint32_t *restrict back_res, uint32_t *restrict len_res, 803207753Smm uint32_t position) 804207753Smm{ 805207753Smm // If we have symbols pending, return the next pending symbol. 806207753Smm if (coder->opts_end_index != coder->opts_current_index) { 807207753Smm assert(mf->read_ahead > 0); 808207753Smm *len_res = coder->opts[coder->opts_current_index].pos_prev 809207753Smm - coder->opts_current_index; 810207753Smm *back_res = coder->opts[coder->opts_current_index].back_prev; 811207753Smm coder->opts_current_index = coder->opts[ 812207753Smm coder->opts_current_index].pos_prev; 813207753Smm return; 814207753Smm } 815207753Smm 816207753Smm // Update the price tables. In LZMA SDK <= 4.60 (and possibly later) 817207753Smm // this was done in both initialization function and in the main loop. 818207753Smm // In liblzma they were moved into this single place. 819207753Smm if (mf->read_ahead == 0) { 820207753Smm if (coder->match_price_count >= (1 << 7)) 821292588Sdelphij fill_dist_prices(coder); 822207753Smm 823292588Sdelphij if (coder->align_price_count >= ALIGN_SIZE) 824207753Smm fill_align_prices(coder); 825207753Smm } 826207753Smm 827207753Smm // TODO: This needs quite a bit of cleaning still. But splitting 828207753Smm // the original function into two pieces makes it at least a little 829207753Smm // more readable, since those two parts don't share many variables. 830207753Smm 831207753Smm uint32_t len_end = helper1(coder, mf, back_res, len_res, position); 832207753Smm if (len_end == UINT32_MAX) 833207753Smm return; 834207753Smm 835292588Sdelphij uint32_t reps[REPS]; 836207753Smm memcpy(reps, coder->reps, sizeof(reps)); 837207753Smm 838207753Smm uint32_t cur; 839207753Smm for (cur = 1; cur < len_end; ++cur) { 840207753Smm assert(cur < OPTS); 841207753Smm 842207753Smm coder->longest_match_length = mf_find( 843207753Smm mf, &coder->matches_count, coder->matches); 844207753Smm 845207753Smm if (coder->longest_match_length >= mf->nice_len) 846207753Smm break; 847207753Smm 848207753Smm len_end = helper2(coder, reps, mf_ptr(mf) - 1, len_end, 849207753Smm position + cur, cur, mf->nice_len, 850213700Smm my_min(mf_avail(mf) + 1, OPTS - 1 - cur)); 851207753Smm } 852207753Smm 853207753Smm backward(coder, len_res, back_res, cur); 854207753Smm return; 855207753Smm} 856