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1 /**
2 * Copyright (c) 2016-present, Przemyslaw Skibinski, Yann Collet, Facebook, Inc.
3 * All rights reserved.
4 *
5 * This source code is licensed under the BSD-style license found in the
6 * LICENSE file in the root directory of https://github.com/facebook/zstd.
7 *
8 * This program is free software; you can redistribute it and/or modify it under
9 * the terms of the GNU General Public License version 2 as published by the
10 * Free Software Foundation. This program is dual-licensed; you may select
11 * either version 2 of the GNU General Public License ("GPL") or BSD license
12 * ("BSD").
13 */
14
15 /* Note : this file is intended to be included within zstd_compress.c */
16
17 #ifndef ZSTD_OPT_H_91842398743
18 #define ZSTD_OPT_H_91842398743
19
20 #define ZSTD_LITFREQ_ADD 2
21 #define ZSTD_FREQ_DIV 4
22 #define ZSTD_MAX_PRICE (1 << 30)
23
24 /*-*************************************
25 * Price functions for optimal parser
26 ***************************************/
27 FORCE_INLINE void ZSTD_setLog2Prices(seqStore_t *ssPtr)
28 {
29 ssPtr->log2matchLengthSum = ZSTD_highbit32(ssPtr->matchLengthSum + 1);
30 ssPtr->log2litLengthSum = ZSTD_highbit32(ssPtr->litLengthSum + 1);
31 ssPtr->log2litSum = ZSTD_highbit32(ssPtr->litSum + 1);
32 ssPtr->log2offCodeSum = ZSTD_highbit32(ssPtr->offCodeSum + 1);
33 ssPtr->factor = 1 + ((ssPtr->litSum >> 5) / ssPtr->litLengthSum) + ((ssPtr->litSum << 1) / (ssPtr->litSum + ssPtr->matchSum));
34 }
35
36 ZSTD_STATIC void ZSTD_rescaleFreqs(seqStore_t *ssPtr, const BYTE *src, size_t srcSize)
37 {
38 unsigned u;
39
40 ssPtr->cachedLiterals = NULL;
41 ssPtr->cachedPrice = ssPtr->cachedLitLength = 0;
42 ssPtr->staticPrices = 0;
43
44 if (ssPtr->litLengthSum == 0) {
45 if (srcSize <= 1024)
46 ssPtr->staticPrices = 1;
47
48 for (u = 0; u <= MaxLit; u++)
49 ssPtr->litFreq[u] = 0;
50 for (u = 0; u < srcSize; u++)
51 ssPtr->litFreq[src[u]]++;
52
53 ssPtr->litSum = 0;
54 ssPtr->litLengthSum = MaxLL + 1;
55 ssPtr->matchLengthSum = MaxML + 1;
56 ssPtr->offCodeSum = (MaxOff + 1);
57 ssPtr->matchSum = (ZSTD_LITFREQ_ADD << Litbits);
58
59 for (u = 0; u <= MaxLit; u++) {
60 ssPtr->litFreq[u] = 1 + (ssPtr->litFreq[u] >> ZSTD_FREQ_DIV);
61 ssPtr->litSum += ssPtr->litFreq[u];
62 }
63 for (u = 0; u <= MaxLL; u++)
64 ssPtr->litLengthFreq[u] = 1;
65 for (u = 0; u <= MaxML; u++)
66 ssPtr->matchLengthFreq[u] = 1;
67 for (u = 0; u <= MaxOff; u++)
68 ssPtr->offCodeFreq[u] = 1;
69 } else {
70 ssPtr->matchLengthSum = 0;
71 ssPtr->litLengthSum = 0;
72 ssPtr->offCodeSum = 0;
73 ssPtr->matchSum = 0;
74 ssPtr->litSum = 0;
75
76 for (u = 0; u <= MaxLit; u++) {
77 ssPtr->litFreq[u] = 1 + (ssPtr->litFreq[u] >> (ZSTD_FREQ_DIV + 1));
78 ssPtr->litSum += ssPtr->litFreq[u];
79 }
80 for (u = 0; u <= MaxLL; u++) {
81 ssPtr->litLengthFreq[u] = 1 + (ssPtr->litLengthFreq[u] >> (ZSTD_FREQ_DIV + 1));
82 ssPtr->litLengthSum += ssPtr->litLengthFreq[u];
83 }
84 for (u = 0; u <= MaxML; u++) {
85 ssPtr->matchLengthFreq[u] = 1 + (ssPtr->matchLengthFreq[u] >> ZSTD_FREQ_DIV);
86 ssPtr->matchLengthSum += ssPtr->matchLengthFreq[u];
87 ssPtr->matchSum += ssPtr->matchLengthFreq[u] * (u + 3);
88 }
89 ssPtr->matchSum *= ZSTD_LITFREQ_ADD;
90 for (u = 0; u <= MaxOff; u++) {
91 ssPtr->offCodeFreq[u] = 1 + (ssPtr->offCodeFreq[u] >> ZSTD_FREQ_DIV);
92 ssPtr->offCodeSum += ssPtr->offCodeFreq[u];
93 }
94 }
95
96 ZSTD_setLog2Prices(ssPtr);
97 }
98
99 FORCE_INLINE U32 ZSTD_getLiteralPrice(seqStore_t *ssPtr, U32 litLength, const BYTE *literals)
100 {
101 U32 price, u;
102
103 if (ssPtr->staticPrices)
104 return ZSTD_highbit32((U32)litLength + 1) + (litLength * 6);
105
106 if (litLength == 0)
107 return ssPtr->log2litLengthSum - ZSTD_highbit32(ssPtr->litLengthFreq[0] + 1);
108
109 /* literals */
110 if (ssPtr->cachedLiterals == literals) {
111 U32 const additional = litLength - ssPtr->cachedLitLength;
112 const BYTE *literals2 = ssPtr->cachedLiterals + ssPtr->cachedLitLength;
113 price = ssPtr->cachedPrice + additional * ssPtr->log2litSum;
114 for (u = 0; u < additional; u++)
115 price -= ZSTD_highbit32(ssPtr->litFreq[literals2[u]] + 1);
116 ssPtr->cachedPrice = price;
117 ssPtr->cachedLitLength = litLength;
118 } else {
119 price = litLength * ssPtr->log2litSum;
120 for (u = 0; u < litLength; u++)
121 price -= ZSTD_highbit32(ssPtr->litFreq[literals[u]] + 1);
122
123 if (litLength >= 12) {
124 ssPtr->cachedLiterals = literals;
125 ssPtr->cachedPrice = price;
126 ssPtr->cachedLitLength = litLength;
127 }
128 }
129
130 /* literal Length */
131 {
132 const BYTE LL_deltaCode = 19;
133 const BYTE llCode = (litLength > 63) ? (BYTE)ZSTD_highbit32(litLength) + LL_deltaCode : LL_Code[litLength];
134 price += LL_bits[llCode] + ssPtr->log2litLengthSum - ZSTD_highbit32(ssPtr->litLengthFreq[llCode] + 1);
135 }
136
137 return price;
138 }
139
140 FORCE_INLINE U32 ZSTD_getPrice(seqStore_t *seqStorePtr, U32 litLength, const BYTE *literals, U32 offset, U32 matchLength, const int ultra)
141 {
142 /* offset */
143 U32 price;
144 BYTE const offCode = (BYTE)ZSTD_highbit32(offset + 1);
145
146 if (seqStorePtr->staticPrices)
147 return ZSTD_getLiteralPrice(seqStorePtr, litLength, literals) + ZSTD_highbit32((U32)matchLength + 1) + 16 + offCode;
148
149 price = offCode + seqStorePtr->log2offCodeSum - ZSTD_highbit32(seqStorePtr->offCodeFreq[offCode] + 1);
150 if (!ultra && offCode >= 20)
151 price += (offCode - 19) * 2;
152
153 /* match Length */
154 {
155 const BYTE ML_deltaCode = 36;
156 const BYTE mlCode = (matchLength > 127) ? (BYTE)ZSTD_highbit32(matchLength) + ML_deltaCode : ML_Code[matchLength];
157 price += ML_bits[mlCode] + seqStorePtr->log2matchLengthSum - ZSTD_highbit32(seqStorePtr->matchLengthFreq[mlCode] + 1);
158 }
159
160 return price + ZSTD_getLiteralPrice(seqStorePtr, litLength, literals) + seqStorePtr->factor;
161 }
162
163 ZSTD_STATIC void ZSTD_updatePrice(seqStore_t *seqStorePtr, U32 litLength, const BYTE *literals, U32 offset, U32 matchLength)
164 {
165 U32 u;
166
167 /* literals */
168 seqStorePtr->litSum += litLength * ZSTD_LITFREQ_ADD;
169 for (u = 0; u < litLength; u++)
170 seqStorePtr->litFreq[literals[u]] += ZSTD_LITFREQ_ADD;
171
172 /* literal Length */
173 {
174 const BYTE LL_deltaCode = 19;
175 const BYTE llCode = (litLength > 63) ? (BYTE)ZSTD_highbit32(litLength) + LL_deltaCode : LL_Code[litLength];
176 seqStorePtr->litLengthFreq[llCode]++;
177 seqStorePtr->litLengthSum++;
178 }
179
180 /* match offset */
181 {
182 BYTE const offCode = (BYTE)ZSTD_highbit32(offset + 1);
183 seqStorePtr->offCodeSum++;
184 seqStorePtr->offCodeFreq[offCode]++;
185 }
186
187 /* match Length */
188 {
189 const BYTE ML_deltaCode = 36;
190 const BYTE mlCode = (matchLength > 127) ? (BYTE)ZSTD_highbit32(matchLength) + ML_deltaCode : ML_Code[matchLength];
191 seqStorePtr->matchLengthFreq[mlCode]++;
192 seqStorePtr->matchLengthSum++;
193 }
194
195 ZSTD_setLog2Prices(seqStorePtr);
196 }
197
198 #define SET_PRICE(pos, mlen_, offset_, litlen_, price_) \
199 { \
200 while (last_pos < pos) { \
201 opt[last_pos + 1].price = ZSTD_MAX_PRICE; \
202 last_pos++; \
203 } \
204 opt[pos].mlen = mlen_; \
205 opt[pos].off = offset_; \
206 opt[pos].litlen = litlen_; \
207 opt[pos].price = price_; \
208 }
209
210 /* Update hashTable3 up to ip (excluded)
211 Assumption : always within prefix (i.e. not within extDict) */
212 FORCE_INLINE
213 U32 ZSTD_insertAndFindFirstIndexHash3(ZSTD_CCtx *zc, const BYTE *ip)
214 {
215 U32 *const hashTable3 = zc->hashTable3;
216 U32 const hashLog3 = zc->hashLog3;
217 const BYTE *const base = zc->base;
218 U32 idx = zc->nextToUpdate3;
219 const U32 target = zc->nextToUpdate3 = (U32)(ip - base);
220 const size_t hash3 = ZSTD_hash3Ptr(ip, hashLog3);
221
222 while (idx < target) {
223 hashTable3[ZSTD_hash3Ptr(base + idx, hashLog3)] = idx;
224 idx++;
225 }
226
227 return hashTable3[hash3];
228 }
229
230 /*-*************************************
231 * Binary Tree search
232 ***************************************/
233 static U32 ZSTD_insertBtAndGetAllMatches(ZSTD_CCtx *zc, const BYTE *const ip, const BYTE *const iLimit, U32 nbCompares, const U32 mls, U32 extDict,
234 ZSTD_match_t *matches, const U32 minMatchLen)
235 {
236 const BYTE *const base = zc->base;
237 const U32 curr = (U32)(ip - base);
238 const U32 hashLog = zc->params.cParams.hashLog;
239 const size_t h = ZSTD_hashPtr(ip, hashLog, mls);
240 U32 *const hashTable = zc->hashTable;
241 U32 matchIndex = hashTable[h];
242 U32 *const bt = zc->chainTable;
243 const U32 btLog = zc->params.cParams.chainLog - 1;
244 const U32 btMask = (1U << btLog) - 1;
245 size_t commonLengthSmaller = 0, commonLengthLarger = 0;
246 const BYTE *const dictBase = zc->dictBase;
247 const U32 dictLimit = zc->dictLimit;
248 const BYTE *const dictEnd = dictBase + dictLimit;
249 const BYTE *const prefixStart = base + dictLimit;
250 const U32 btLow = btMask >= curr ? 0 : curr - btMask;
251 const U32 windowLow = zc->lowLimit;
252 U32 *smallerPtr = bt + 2 * (curr & btMask);
253 U32 *largerPtr = bt + 2 * (curr & btMask) + 1;
254 U32 matchEndIdx = curr + 8;
255 U32 dummy32; /* to be nullified at the end */
256 U32 mnum = 0;
257
258 const U32 minMatch = (mls == 3) ? 3 : 4;
259 size_t bestLength = minMatchLen - 1;
260
261 if (minMatch == 3) { /* HC3 match finder */
262 U32 const matchIndex3 = ZSTD_insertAndFindFirstIndexHash3(zc, ip);
263 if (matchIndex3 > windowLow && (curr - matchIndex3 < (1 << 18))) {
264 const BYTE *match;
265 size_t currMl = 0;
266 if ((!extDict) || matchIndex3 >= dictLimit) {
267 match = base + matchIndex3;
268 if (match[bestLength] == ip[bestLength])
269 currMl = ZSTD_count(ip, match, iLimit);
270 } else {
271 match = dictBase + matchIndex3;
272 if (ZSTD_readMINMATCH(match, MINMATCH) ==
273 ZSTD_readMINMATCH(ip, MINMATCH)) /* assumption : matchIndex3 <= dictLimit-4 (by table construction) */
274 currMl = ZSTD_count_2segments(ip + MINMATCH, match + MINMATCH, iLimit, dictEnd, prefixStart) + MINMATCH;
275 }
276
277 /* save best solution */
278 if (currMl > bestLength) {
279 bestLength = currMl;
280 matches[mnum].off = ZSTD_REP_MOVE_OPT + curr - matchIndex3;
281 matches[mnum].len = (U32)currMl;
282 mnum++;
283 if (currMl > ZSTD_OPT_NUM)
284 goto update;
285 if (ip + currMl == iLimit)
286 goto update; /* best possible, and avoid read overflow*/
287 }
288 }
289 }
290
291 hashTable[h] = curr; /* Update Hash Table */
292
293 while (nbCompares-- && (matchIndex > windowLow)) {
294 U32 *nextPtr = bt + 2 * (matchIndex & btMask);
295 size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger); /* guaranteed minimum nb of common bytes */
296 const BYTE *match;
297
298 if ((!extDict) || (matchIndex + matchLength >= dictLimit)) {
299 match = base + matchIndex;
300 if (match[matchLength] == ip[matchLength]) {
301 matchLength += ZSTD_count(ip + matchLength + 1, match + matchLength + 1, iLimit) + 1;
302 }
303 } else {
304 match = dictBase + matchIndex;
305 matchLength += ZSTD_count_2segments(ip + matchLength, match + matchLength, iLimit, dictEnd, prefixStart);
306 if (matchIndex + matchLength >= dictLimit)
307 match = base + matchIndex; /* to prepare for next usage of match[matchLength] */
308 }
309
310 if (matchLength > bestLength) {
311 if (matchLength > matchEndIdx - matchIndex)
312 matchEndIdx = matchIndex + (U32)matchLength;
313 bestLength = matchLength;
314 matches[mnum].off = ZSTD_REP_MOVE_OPT + curr - matchIndex;
315 matches[mnum].len = (U32)matchLength;
316 mnum++;
317 if (matchLength > ZSTD_OPT_NUM)
318 break;
319 if (ip + matchLength == iLimit) /* equal : no way to know if inf or sup */
320 break; /* drop, to guarantee consistency (miss a little bit of compression) */
321 }
322
323 if (match[matchLength] < ip[matchLength]) {
324 /* match is smaller than curr */
325 *smallerPtr = matchIndex; /* update smaller idx */
326 commonLengthSmaller = matchLength; /* all smaller will now have at least this guaranteed common length */
327 if (matchIndex <= btLow) {
328 smallerPtr = &dummy32;
329 break;
330 } /* beyond tree size, stop the search */
331 smallerPtr = nextPtr + 1; /* new "smaller" => larger of match */
332 matchIndex = nextPtr[1]; /* new matchIndex larger than previous (closer to curr) */
333 } else {
334 /* match is larger than curr */
335 *largerPtr = matchIndex;
336 commonLengthLarger = matchLength;
337 if (matchIndex <= btLow) {
338 largerPtr = &dummy32;
339 break;
340 } /* beyond tree size, stop the search */
341 largerPtr = nextPtr;
342 matchIndex = nextPtr[0];
343 }
344 }
345
346 *smallerPtr = *largerPtr = 0;
347
348 update:
349 zc->nextToUpdate = (matchEndIdx > curr + 8) ? matchEndIdx - 8 : curr + 1;
350 return mnum;
351 }
352
353 /** Tree updater, providing best match */
354 static U32 ZSTD_BtGetAllMatches(ZSTD_CCtx *zc, const BYTE *const ip, const BYTE *const iLimit, const U32 maxNbAttempts, const U32 mls, ZSTD_match_t *matches,
355 const U32 minMatchLen)
356 {
357 if (ip < zc->base + zc->nextToUpdate)
358 return 0; /* skipped area */
359 ZSTD_updateTree(zc, ip, iLimit, maxNbAttempts, mls);
360 return ZSTD_insertBtAndGetAllMatches(zc, ip, iLimit, maxNbAttempts, mls, 0, matches, minMatchLen);
361 }
362
363 static U32 ZSTD_BtGetAllMatches_selectMLS(ZSTD_CCtx *zc, /* Index table will be updated */
364 const BYTE *ip, const BYTE *const iHighLimit, const U32 maxNbAttempts, const U32 matchLengthSearch,
365 ZSTD_match_t *matches, const U32 minMatchLen)
366 {
367 switch (matchLengthSearch) {
368 case 3: return ZSTD_BtGetAllMatches(zc, ip, iHighLimit, maxNbAttempts, 3, matches, minMatchLen);
369 default:
370 case 4: return ZSTD_BtGetAllMatches(zc, ip, iHighLimit, maxNbAttempts, 4, matches, minMatchLen);
371 case 5: return ZSTD_BtGetAllMatches(zc, ip, iHighLimit, maxNbAttempts, 5, matches, minMatchLen);
372 case 7:
373 case 6: return ZSTD_BtGetAllMatches(zc, ip, iHighLimit, maxNbAttempts, 6, matches, minMatchLen);
374 }
375 }
376
377 /** Tree updater, providing best match */
378 static U32 ZSTD_BtGetAllMatches_extDict(ZSTD_CCtx *zc, const BYTE *const ip, const BYTE *const iLimit, const U32 maxNbAttempts, const U32 mls,
379 ZSTD_match_t *matches, const U32 minMatchLen)
380 {
381 if (ip < zc->base + zc->nextToUpdate)
382 return 0; /* skipped area */
383 ZSTD_updateTree_extDict(zc, ip, iLimit, maxNbAttempts, mls);
384 return ZSTD_insertBtAndGetAllMatches(zc, ip, iLimit, maxNbAttempts, mls, 1, matches, minMatchLen);
385 }
386
387 static U32 ZSTD_BtGetAllMatches_selectMLS_extDict(ZSTD_CCtx *zc, /* Index table will be updated */
388 const BYTE *ip, const BYTE *const iHighLimit, const U32 maxNbAttempts, const U32 matchLengthSearch,
389 ZSTD_match_t *matches, const U32 minMatchLen)
390 {
391 switch (matchLengthSearch) {
392 case 3: return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 3, matches, minMatchLen);
393 default:
394 case 4: return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 4, matches, minMatchLen);
395 case 5: return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 5, matches, minMatchLen);
396 case 7:
397 case 6: return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 6, matches, minMatchLen);
398 }
399 }
400
401 /*-*******************************
402 * Optimal parser
403 *********************************/
404 FORCE_INLINE
405 void ZSTD_compressBlock_opt_generic(ZSTD_CCtx *ctx, const void *src, size_t srcSize, const int ultra)
406 {
407 seqStore_t *seqStorePtr = &(ctx->seqStore);
408 const BYTE *const istart = (const BYTE *)src;
409 const BYTE *ip = istart;
410 const BYTE *anchor = istart;
411 const BYTE *const iend = istart + srcSize;
412 const BYTE *const ilimit = iend - 8;
413 const BYTE *const base = ctx->base;
414 const BYTE *const prefixStart = base + ctx->dictLimit;
415
416 const U32 maxSearches = 1U << ctx->params.cParams.searchLog;
417 const U32 sufficient_len = ctx->params.cParams.targetLength;
418 const U32 mls = ctx->params.cParams.searchLength;
419 const U32 minMatch = (ctx->params.cParams.searchLength == 3) ? 3 : 4;
420
421 ZSTD_optimal_t *opt = seqStorePtr->priceTable;
422 ZSTD_match_t *matches = seqStorePtr->matchTable;
423 const BYTE *inr;
424 U32 offset, rep[ZSTD_REP_NUM];
425
426 /* init */
427 ctx->nextToUpdate3 = ctx->nextToUpdate;
428 ZSTD_rescaleFreqs(seqStorePtr, (const BYTE *)src, srcSize);
429 ip += (ip == prefixStart);
430 {
431 U32 i;
432 for (i = 0; i < ZSTD_REP_NUM; i++)
433 rep[i] = ctx->rep[i];
434 }
435
436 /* Match Loop */
437 while (ip < ilimit) {
438 U32 cur, match_num, last_pos, litlen, price;
439 U32 u, mlen, best_mlen, best_off, litLength;
440 memset(opt, 0, sizeof(ZSTD_optimal_t));
441 last_pos = 0;
442 litlen = (U32)(ip - anchor);
443
444 /* check repCode */
445 {
446 U32 i, last_i = ZSTD_REP_CHECK + (ip == anchor);
447 for (i = (ip == anchor); i < last_i; i++) {
448 const S32 repCur = (i == ZSTD_REP_MOVE_OPT) ? (rep[0] - 1) : rep[i];
449 if ((repCur > 0) && (repCur < (S32)(ip - prefixStart)) &&
450 (ZSTD_readMINMATCH(ip, minMatch) == ZSTD_readMINMATCH(ip - repCur, minMatch))) {
451 mlen = (U32)ZSTD_count(ip + minMatch, ip + minMatch - repCur, iend) + minMatch;
452 if (mlen > sufficient_len || mlen >= ZSTD_OPT_NUM) {
453 best_mlen = mlen;
454 best_off = i;
455 cur = 0;
456 last_pos = 1;
457 goto _storeSequence;
458 }
459 best_off = i - (ip == anchor);
460 do {
461 price = ZSTD_getPrice(seqStorePtr, litlen, anchor, best_off, mlen - MINMATCH, ultra);
462 if (mlen > last_pos || price < opt[mlen].price)
463 SET_PRICE(mlen, mlen, i, litlen, price); /* note : macro modifies last_pos */
464 mlen--;
465 } while (mlen >= minMatch);
466 }
467 }
468 }
469
470 match_num = ZSTD_BtGetAllMatches_selectMLS(ctx, ip, iend, maxSearches, mls, matches, minMatch);
471
472 if (!last_pos && !match_num) {
473 ip++;
474 continue;
475 }
476
477 if (match_num && (matches[match_num - 1].len > sufficient_len || matches[match_num - 1].len >= ZSTD_OPT_NUM)) {
478 best_mlen = matches[match_num - 1].len;
479 best_off = matches[match_num - 1].off;
480 cur = 0;
481 last_pos = 1;
482 goto _storeSequence;
483 }
484
485 /* set prices using matches at position = 0 */
486 best_mlen = (last_pos) ? last_pos : minMatch;
487 for (u = 0; u < match_num; u++) {
488 mlen = (u > 0) ? matches[u - 1].len + 1 : best_mlen;
489 best_mlen = matches[u].len;
490 while (mlen <= best_mlen) {
491 price = ZSTD_getPrice(seqStorePtr, litlen, anchor, matches[u].off - 1, mlen - MINMATCH, ultra);
492 if (mlen > last_pos || price < opt[mlen].price)
493 SET_PRICE(mlen, mlen, matches[u].off, litlen, price); /* note : macro modifies last_pos */
494 mlen++;
495 }
496 }
497
498 if (last_pos < minMatch) {
499 ip++;
500 continue;
501 }
502
503 /* initialize opt[0] */
504 {
505 U32 i;
506 for (i = 0; i < ZSTD_REP_NUM; i++)
507 opt[0].rep[i] = rep[i];
508 }
509 opt[0].mlen = 1;
510 opt[0].litlen = litlen;
511
512 /* check further positions */
513 for (cur = 1; cur <= last_pos; cur++) {
514 inr = ip + cur;
515
516 if (opt[cur - 1].mlen == 1) {
517 litlen = opt[cur - 1].litlen + 1;
518 if (cur > litlen) {
519 price = opt[cur - litlen].price + ZSTD_getLiteralPrice(seqStorePtr, litlen, inr - litlen);
520 } else
521 price = ZSTD_getLiteralPrice(seqStorePtr, litlen, anchor);
522 } else {
523 litlen = 1;
524 price = opt[cur - 1].price + ZSTD_getLiteralPrice(seqStorePtr, litlen, inr - 1);
525 }
526
527 if (cur > last_pos || price <= opt[cur].price)
528 SET_PRICE(cur, 1, 0, litlen, price);
529
530 if (cur == last_pos)
531 break;
532
533 if (inr > ilimit) /* last match must start at a minimum distance of 8 from oend */
534 continue;
535
536 mlen = opt[cur].mlen;
537 if (opt[cur].off > ZSTD_REP_MOVE_OPT) {
538 opt[cur].rep[2] = opt[cur - mlen].rep[1];
539 opt[cur].rep[1] = opt[cur - mlen].rep[0];
540 opt[cur].rep[0] = opt[cur].off - ZSTD_REP_MOVE_OPT;
541 } else {
542 opt[cur].rep[2] = (opt[cur].off > 1) ? opt[cur - mlen].rep[1] : opt[cur - mlen].rep[2];
543 opt[cur].rep[1] = (opt[cur].off > 0) ? opt[cur - mlen].rep[0] : opt[cur - mlen].rep[1];
544 opt[cur].rep[0] =
545 ((opt[cur].off == ZSTD_REP_MOVE_OPT) && (mlen != 1)) ? (opt[cur - mlen].rep[0] - 1) : (opt[cur - mlen].rep[opt[cur].off]);
546 }
547
548 best_mlen = minMatch;
549 {
550 U32 i, last_i = ZSTD_REP_CHECK + (mlen != 1);
551 for (i = (opt[cur].mlen != 1); i < last_i; i++) { /* check rep */
552 const S32 repCur = (i == ZSTD_REP_MOVE_OPT) ? (opt[cur].rep[0] - 1) : opt[cur].rep[i];
553 if ((repCur > 0) && (repCur < (S32)(inr - prefixStart)) &&
554 (ZSTD_readMINMATCH(inr, minMatch) == ZSTD_readMINMATCH(inr - repCur, minMatch))) {
555 mlen = (U32)ZSTD_count(inr + minMatch, inr + minMatch - repCur, iend) + minMatch;
556
557 if (mlen > sufficient_len || cur + mlen >= ZSTD_OPT_NUM) {
558 best_mlen = mlen;
559 best_off = i;
560 last_pos = cur + 1;
561 goto _storeSequence;
562 }
563
564 best_off = i - (opt[cur].mlen != 1);
565 if (mlen > best_mlen)
566 best_mlen = mlen;
567
568 do {
569 if (opt[cur].mlen == 1) {
570 litlen = opt[cur].litlen;
571 if (cur > litlen) {
572 price = opt[cur - litlen].price + ZSTD_getPrice(seqStorePtr, litlen, inr - litlen,
573 best_off, mlen - MINMATCH, ultra);
574 } else
575 price = ZSTD_getPrice(seqStorePtr, litlen, anchor, best_off, mlen - MINMATCH, ultra);
576 } else {
577 litlen = 0;
578 price = opt[cur].price + ZSTD_getPrice(seqStorePtr, 0, NULL, best_off, mlen - MINMATCH, ultra);
579 }
580
581 if (cur + mlen > last_pos || price <= opt[cur + mlen].price)
582 SET_PRICE(cur + mlen, mlen, i, litlen, price);
583 mlen--;
584 } while (mlen >= minMatch);
585 }
586 }
587 }
588
589 match_num = ZSTD_BtGetAllMatches_selectMLS(ctx, inr, iend, maxSearches, mls, matches, best_mlen);
590
591 if (match_num > 0 && (matches[match_num - 1].len > sufficient_len || cur + matches[match_num - 1].len >= ZSTD_OPT_NUM)) {
592 best_mlen = matches[match_num - 1].len;
593 best_off = matches[match_num - 1].off;
594 last_pos = cur + 1;
595 goto _storeSequence;
596 }
597
598 /* set prices using matches at position = cur */
599 for (u = 0; u < match_num; u++) {
600 mlen = (u > 0) ? matches[u - 1].len + 1 : best_mlen;
601 best_mlen = matches[u].len;
602
603 while (mlen <= best_mlen) {
604 if (opt[cur].mlen == 1) {
605 litlen = opt[cur].litlen;
606 if (cur > litlen)
607 price = opt[cur - litlen].price + ZSTD_getPrice(seqStorePtr, litlen, ip + cur - litlen,
608 matches[u].off - 1, mlen - MINMATCH, ultra);
609 else
610 price = ZSTD_getPrice(seqStorePtr, litlen, anchor, matches[u].off - 1, mlen - MINMATCH, ultra);
611 } else {
612 litlen = 0;
613 price = opt[cur].price + ZSTD_getPrice(seqStorePtr, 0, NULL, matches[u].off - 1, mlen - MINMATCH, ultra);
614 }
615
616 if (cur + mlen > last_pos || (price < opt[cur + mlen].price))
617 SET_PRICE(cur + mlen, mlen, matches[u].off, litlen, price);
618
619 mlen++;
620 }
621 }
622 }
623
624 best_mlen = opt[last_pos].mlen;
625 best_off = opt[last_pos].off;
626 cur = last_pos - best_mlen;
627
628 /* store sequence */
629 _storeSequence: /* cur, last_pos, best_mlen, best_off have to be set */
630 opt[0].mlen = 1;
631
632 while (1) {
633 mlen = opt[cur].mlen;
634 offset = opt[cur].off;
635 opt[cur].mlen = best_mlen;
636 opt[cur].off = best_off;
637 best_mlen = mlen;
638 best_off = offset;
639 if (mlen > cur)
640 break;
641 cur -= mlen;
642 }
643
644 for (u = 0; u <= last_pos;) {
645 u += opt[u].mlen;
646 }
647
648 for (cur = 0; cur < last_pos;) {
649 mlen = opt[cur].mlen;
650 if (mlen == 1) {
651 ip++;
652 cur++;
653 continue;
654 }
655 offset = opt[cur].off;
656 cur += mlen;
657 litLength = (U32)(ip - anchor);
658
659 if (offset > ZSTD_REP_MOVE_OPT) {
660 rep[2] = rep[1];
661 rep[1] = rep[0];
662 rep[0] = offset - ZSTD_REP_MOVE_OPT;
663 offset--;
664 } else {
665 if (offset != 0) {
666 best_off = (offset == ZSTD_REP_MOVE_OPT) ? (rep[0] - 1) : (rep[offset]);
667 if (offset != 1)
668 rep[2] = rep[1];
669 rep[1] = rep[0];
670 rep[0] = best_off;
671 }
672 if (litLength == 0)
673 offset--;
674 }
675
676 ZSTD_updatePrice(seqStorePtr, litLength, anchor, offset, mlen - MINMATCH);
677 ZSTD_storeSeq(seqStorePtr, litLength, anchor, offset, mlen - MINMATCH);
678 anchor = ip = ip + mlen;
679 }
680 } /* for (cur=0; cur < last_pos; ) */
681
682 /* Save reps for next block */
683 {
684 int i;
685 for (i = 0; i < ZSTD_REP_NUM; i++)
686 ctx->repToConfirm[i] = rep[i];
687 }
688
689 /* Last Literals */
690 {
691 size_t const lastLLSize = iend - anchor;
692 memcpy(seqStorePtr->lit, anchor, lastLLSize);
693 seqStorePtr->lit += lastLLSize;
694 }
695 }
696
697 FORCE_INLINE
698 void ZSTD_compressBlock_opt_extDict_generic(ZSTD_CCtx *ctx, const void *src, size_t srcSize, const int ultra)
699 {
700 seqStore_t *seqStorePtr = &(ctx->seqStore);
701 const BYTE *const istart = (const BYTE *)src;
702 const BYTE *ip = istart;
703 const BYTE *anchor = istart;
704 const BYTE *const iend = istart + srcSize;
705 const BYTE *const ilimit = iend - 8;
706 const BYTE *const base = ctx->base;
707 const U32 lowestIndex = ctx->lowLimit;
708 const U32 dictLimit = ctx->dictLimit;
709 const BYTE *const prefixStart = base + dictLimit;
710 const BYTE *const dictBase = ctx->dictBase;
711 const BYTE *const dictEnd = dictBase + dictLimit;
712
713 const U32 maxSearches = 1U << ctx->params.cParams.searchLog;
714 const U32 sufficient_len = ctx->params.cParams.targetLength;
715 const U32 mls = ctx->params.cParams.searchLength;
716 const U32 minMatch = (ctx->params.cParams.searchLength == 3) ? 3 : 4;
717
718 ZSTD_optimal_t *opt = seqStorePtr->priceTable;
719 ZSTD_match_t *matches = seqStorePtr->matchTable;
720 const BYTE *inr;
721
722 /* init */
723 U32 offset, rep[ZSTD_REP_NUM];
724 {
725 U32 i;
726 for (i = 0; i < ZSTD_REP_NUM; i++)
727 rep[i] = ctx->rep[i];
728 }
729
730 ctx->nextToUpdate3 = ctx->nextToUpdate;
731 ZSTD_rescaleFreqs(seqStorePtr, (const BYTE *)src, srcSize);
732 ip += (ip == prefixStart);
733
734 /* Match Loop */
735 while (ip < ilimit) {
736 U32 cur, match_num, last_pos, litlen, price;
737 U32 u, mlen, best_mlen, best_off, litLength;
738 U32 curr = (U32)(ip - base);
739 memset(opt, 0, sizeof(ZSTD_optimal_t));
740 last_pos = 0;
741 opt[0].litlen = (U32)(ip - anchor);
742
743 /* check repCode */
744 {
745 U32 i, last_i = ZSTD_REP_CHECK + (ip == anchor);
746 for (i = (ip == anchor); i < last_i; i++) {
747 const S32 repCur = (i == ZSTD_REP_MOVE_OPT) ? (rep[0] - 1) : rep[i];
748 const U32 repIndex = (U32)(curr - repCur);
749 const BYTE *const repBase = repIndex < dictLimit ? dictBase : base;
750 const BYTE *const repMatch = repBase + repIndex;
751 if ((repCur > 0 && repCur <= (S32)curr) &&
752 (((U32)((dictLimit - 1) - repIndex) >= 3) & (repIndex > lowestIndex)) /* intentional overflow */
753 && (ZSTD_readMINMATCH(ip, minMatch) == ZSTD_readMINMATCH(repMatch, minMatch))) {
754 /* repcode detected we should take it */
755 const BYTE *const repEnd = repIndex < dictLimit ? dictEnd : iend;
756 mlen = (U32)ZSTD_count_2segments(ip + minMatch, repMatch + minMatch, iend, repEnd, prefixStart) + minMatch;
757
758 if (mlen > sufficient_len || mlen >= ZSTD_OPT_NUM) {
759 best_mlen = mlen;
760 best_off = i;
761 cur = 0;
762 last_pos = 1;
763 goto _storeSequence;
764 }
765
766 best_off = i - (ip == anchor);
767 litlen = opt[0].litlen;
768 do {
769 price = ZSTD_getPrice(seqStorePtr, litlen, anchor, best_off, mlen - MINMATCH, ultra);
770 if (mlen > last_pos || price < opt[mlen].price)
771 SET_PRICE(mlen, mlen, i, litlen, price); /* note : macro modifies last_pos */
772 mlen--;
773 } while (mlen >= minMatch);
774 }
775 }
776 }
777
778 match_num = ZSTD_BtGetAllMatches_selectMLS_extDict(ctx, ip, iend, maxSearches, mls, matches, minMatch); /* first search (depth 0) */
779
780 if (!last_pos && !match_num) {
781 ip++;
782 continue;
783 }
784
785 {
786 U32 i;
787 for (i = 0; i < ZSTD_REP_NUM; i++)
788 opt[0].rep[i] = rep[i];
789 }
790 opt[0].mlen = 1;
791
792 if (match_num && (matches[match_num - 1].len > sufficient_len || matches[match_num - 1].len >= ZSTD_OPT_NUM)) {
793 best_mlen = matches[match_num - 1].len;
794 best_off = matches[match_num - 1].off;
795 cur = 0;
796 last_pos = 1;
797 goto _storeSequence;
798 }
799
800 best_mlen = (last_pos) ? last_pos : minMatch;
801
802 /* set prices using matches at position = 0 */
803 for (u = 0; u < match_num; u++) {
804 mlen = (u > 0) ? matches[u - 1].len + 1 : best_mlen;
805 best_mlen = matches[u].len;
806 litlen = opt[0].litlen;
807 while (mlen <= best_mlen) {
808 price = ZSTD_getPrice(seqStorePtr, litlen, anchor, matches[u].off - 1, mlen - MINMATCH, ultra);
809 if (mlen > last_pos || price < opt[mlen].price)
810 SET_PRICE(mlen, mlen, matches[u].off, litlen, price);
811 mlen++;
812 }
813 }
814
815 if (last_pos < minMatch) {
816 ip++;
817 continue;
818 }
819
820 /* check further positions */
821 for (cur = 1; cur <= last_pos; cur++) {
822 inr = ip + cur;
823
824 if (opt[cur - 1].mlen == 1) {
825 litlen = opt[cur - 1].litlen + 1;
826 if (cur > litlen) {
827 price = opt[cur - litlen].price + ZSTD_getLiteralPrice(seqStorePtr, litlen, inr - litlen);
828 } else
829 price = ZSTD_getLiteralPrice(seqStorePtr, litlen, anchor);
830 } else {
831 litlen = 1;
832 price = opt[cur - 1].price + ZSTD_getLiteralPrice(seqStorePtr, litlen, inr - 1);
833 }
834
835 if (cur > last_pos || price <= opt[cur].price)
836 SET_PRICE(cur, 1, 0, litlen, price);
837
838 if (cur == last_pos)
839 break;
840
841 if (inr > ilimit) /* last match must start at a minimum distance of 8 from oend */
842 continue;
843
844 mlen = opt[cur].mlen;
845 if (opt[cur].off > ZSTD_REP_MOVE_OPT) {
846 opt[cur].rep[2] = opt[cur - mlen].rep[1];
847 opt[cur].rep[1] = opt[cur - mlen].rep[0];
848 opt[cur].rep[0] = opt[cur].off - ZSTD_REP_MOVE_OPT;
849 } else {
850 opt[cur].rep[2] = (opt[cur].off > 1) ? opt[cur - mlen].rep[1] : opt[cur - mlen].rep[2];
851 opt[cur].rep[1] = (opt[cur].off > 0) ? opt[cur - mlen].rep[0] : opt[cur - mlen].rep[1];
852 opt[cur].rep[0] =
853 ((opt[cur].off == ZSTD_REP_MOVE_OPT) && (mlen != 1)) ? (opt[cur - mlen].rep[0] - 1) : (opt[cur - mlen].rep[opt[cur].off]);
854 }
855
856 best_mlen = minMatch;
857 {
858 U32 i, last_i = ZSTD_REP_CHECK + (mlen != 1);
859 for (i = (mlen != 1); i < last_i; i++) {
860 const S32 repCur = (i == ZSTD_REP_MOVE_OPT) ? (opt[cur].rep[0] - 1) : opt[cur].rep[i];
861 const U32 repIndex = (U32)(curr + cur - repCur);
862 const BYTE *const repBase = repIndex < dictLimit ? dictBase : base;
863 const BYTE *const repMatch = repBase + repIndex;
864 if ((repCur > 0 && repCur <= (S32)(curr + cur)) &&
865 (((U32)((dictLimit - 1) - repIndex) >= 3) & (repIndex > lowestIndex)) /* intentional overflow */
866 && (ZSTD_readMINMATCH(inr, minMatch) == ZSTD_readMINMATCH(repMatch, minMatch))) {
867 /* repcode detected */
868 const BYTE *const repEnd = repIndex < dictLimit ? dictEnd : iend;
869 mlen = (U32)ZSTD_count_2segments(inr + minMatch, repMatch + minMatch, iend, repEnd, prefixStart) + minMatch;
870
871 if (mlen > sufficient_len || cur + mlen >= ZSTD_OPT_NUM) {
872 best_mlen = mlen;
873 best_off = i;
874 last_pos = cur + 1;
875 goto _storeSequence;
876 }
877
878 best_off = i - (opt[cur].mlen != 1);
879 if (mlen > best_mlen)
880 best_mlen = mlen;
881
882 do {
883 if (opt[cur].mlen == 1) {
884 litlen = opt[cur].litlen;
885 if (cur > litlen) {
886 price = opt[cur - litlen].price + ZSTD_getPrice(seqStorePtr, litlen, inr - litlen,
887 best_off, mlen - MINMATCH, ultra);
888 } else
889 price = ZSTD_getPrice(seqStorePtr, litlen, anchor, best_off, mlen - MINMATCH, ultra);
890 } else {
891 litlen = 0;
892 price = opt[cur].price + ZSTD_getPrice(seqStorePtr, 0, NULL, best_off, mlen - MINMATCH, ultra);
893 }
894
895 if (cur + mlen > last_pos || price <= opt[cur + mlen].price)
896 SET_PRICE(cur + mlen, mlen, i, litlen, price);
897 mlen--;
898 } while (mlen >= minMatch);
899 }
900 }
901 }
902
903 match_num = ZSTD_BtGetAllMatches_selectMLS_extDict(ctx, inr, iend, maxSearches, mls, matches, minMatch);
904
905 if (match_num > 0 && (matches[match_num - 1].len > sufficient_len || cur + matches[match_num - 1].len >= ZSTD_OPT_NUM)) {
906 best_mlen = matches[match_num - 1].len;
907 best_off = matches[match_num - 1].off;
908 last_pos = cur + 1;
909 goto _storeSequence;
910 }
911
912 /* set prices using matches at position = cur */
913 for (u = 0; u < match_num; u++) {
914 mlen = (u > 0) ? matches[u - 1].len + 1 : best_mlen;
915 best_mlen = matches[u].len;
916
917 while (mlen <= best_mlen) {
918 if (opt[cur].mlen == 1) {
919 litlen = opt[cur].litlen;
920 if (cur > litlen)
921 price = opt[cur - litlen].price + ZSTD_getPrice(seqStorePtr, litlen, ip + cur - litlen,
922 matches[u].off - 1, mlen - MINMATCH, ultra);
923 else
924 price = ZSTD_getPrice(seqStorePtr, litlen, anchor, matches[u].off - 1, mlen - MINMATCH, ultra);
925 } else {
926 litlen = 0;
927 price = opt[cur].price + ZSTD_getPrice(seqStorePtr, 0, NULL, matches[u].off - 1, mlen - MINMATCH, ultra);
928 }
929
930 if (cur + mlen > last_pos || (price < opt[cur + mlen].price))
931 SET_PRICE(cur + mlen, mlen, matches[u].off, litlen, price);
932
933 mlen++;
934 }
935 }
936 } /* for (cur = 1; cur <= last_pos; cur++) */
937
938 best_mlen = opt[last_pos].mlen;
939 best_off = opt[last_pos].off;
940 cur = last_pos - best_mlen;
941
942 /* store sequence */
943 _storeSequence: /* cur, last_pos, best_mlen, best_off have to be set */
944 opt[0].mlen = 1;
945
946 while (1) {
947 mlen = opt[cur].mlen;
948 offset = opt[cur].off;
949 opt[cur].mlen = best_mlen;
950 opt[cur].off = best_off;
951 best_mlen = mlen;
952 best_off = offset;
953 if (mlen > cur)
954 break;
955 cur -= mlen;
956 }
957
958 for (u = 0; u <= last_pos;) {
959 u += opt[u].mlen;
960 }
961
962 for (cur = 0; cur < last_pos;) {
963 mlen = opt[cur].mlen;
964 if (mlen == 1) {
965 ip++;
966 cur++;
967 continue;
968 }
969 offset = opt[cur].off;
970 cur += mlen;
971 litLength = (U32)(ip - anchor);
972
973 if (offset > ZSTD_REP_MOVE_OPT) {
974 rep[2] = rep[1];
975 rep[1] = rep[0];
976 rep[0] = offset - ZSTD_REP_MOVE_OPT;
977 offset--;
978 } else {
979 if (offset != 0) {
980 best_off = (offset == ZSTD_REP_MOVE_OPT) ? (rep[0] - 1) : (rep[offset]);
981 if (offset != 1)
982 rep[2] = rep[1];
983 rep[1] = rep[0];
984 rep[0] = best_off;
985 }
986
987 if (litLength == 0)
988 offset--;
989 }
990
991 ZSTD_updatePrice(seqStorePtr, litLength, anchor, offset, mlen - MINMATCH);
992 ZSTD_storeSeq(seqStorePtr, litLength, anchor, offset, mlen - MINMATCH);
993 anchor = ip = ip + mlen;
994 }
995 } /* for (cur=0; cur < last_pos; ) */
996
997 /* Save reps for next block */
998 {
999 int i;
1000 for (i = 0; i < ZSTD_REP_NUM; i++)
1001 ctx->repToConfirm[i] = rep[i];
1002 }
1003
1004 /* Last Literals */
1005 {
1006 size_t lastLLSize = iend - anchor;
1007 memcpy(seqStorePtr->lit, anchor, lastLLSize);
1008 seqStorePtr->lit += lastLLSize;
1009 }
1010 }
1011
1012 #endif /* ZSTD_OPT_H_91842398743 */
Ceph