1 /*
2 * Copyright (c) Yann Collet, Facebook, Inc.
3 * All rights reserved.
4 *
5 * This source code is licensed under both the BSD-style license (found in the
6 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
7 * in the COPYING file in the root directory of this source tree).
8 * You may select, at your option, one of the above-listed licenses.
9 */
10
11 /*-*************************************
12 * Dependencies
13 ***************************************/
14 #include "../common/zstd_deps.h" /* INT_MAX, ZSTD_memset, ZSTD_memcpy */
15 #include "../common/mem.h"
16 #include "hist.h" /* HIST_countFast_wksp */
17 #define FSE_STATIC_LINKING_ONLY /* FSE_encodeSymbol */
18 #include "../common/fse.h"
19 #define HUF_STATIC_LINKING_ONLY
20 #include "../common/huf.h"
21 #include "zstd_compress_internal.h"
22 #include "zstd_compress_sequences.h"
23 #include "zstd_compress_literals.h"
24 #include "zstd_fast.h"
25 #include "zstd_double_fast.h"
26 #include "zstd_lazy.h"
27 #include "zstd_opt.h"
28 #include "zstd_ldm.h"
29 #include "zstd_compress_superblock.h"
30
31 /* ***************************************************************
32 * Tuning parameters
33 *****************************************************************/
34 /*!
35 * COMPRESS_HEAPMODE :
36 * Select how default decompression function ZSTD_compress() allocates its context,
37 * on stack (0, default), or into heap (1).
38 * Note that functions with explicit context such as ZSTD_compressCCtx() are unaffected.
39 */
40
41 /*!
42 * ZSTD_HASHLOG3_MAX :
43 * Maximum size of the hash table dedicated to find 3-bytes matches,
44 * in log format, aka 17 => 1 << 17 == 128Ki positions.
45 * This structure is only used in zstd_opt.
46 * Since allocation is centralized for all strategies, it has to be known here.
47 * The actual (selected) size of the hash table is then stored in ZSTD_matchState_t.hashLog3,
48 * so that zstd_opt.c doesn't need to know about this constant.
49 */
50 #ifndef ZSTD_HASHLOG3_MAX
51 # define ZSTD_HASHLOG3_MAX 17
52 #endif
53
54 /*-*************************************
55 * Helper functions
56 ***************************************/
57 /* ZSTD_compressBound()
58 * Note that the result from this function is only compatible with the "normal"
59 * full-block strategy.
60 * When there are a lot of small blocks due to frequent flush in streaming mode
61 * the overhead of headers can make the compressed data to be larger than the
62 * return value of ZSTD_compressBound().
63 */
64 size_t ZSTD_compressBound(size_t srcSize) {
65 return ZSTD_COMPRESSBOUND(srcSize);
66 }
67
68
69 /*-*************************************
70 * Context memory management
71 ***************************************/
72 struct ZSTD_CDict_s {
73 const void* dictContent;
74 size_t dictContentSize;
75 ZSTD_dictContentType_e dictContentType; /* The dictContentType the CDict was created with */
76 U32* entropyWorkspace; /* entropy workspace of HUF_WORKSPACE_SIZE bytes */
77 ZSTD_cwksp workspace;
78 ZSTD_matchState_t matchState;
79 ZSTD_compressedBlockState_t cBlockState;
80 ZSTD_customMem customMem;
81 U32 dictID;
82 int compressionLevel; /* 0 indicates that advanced API was used to select CDict params */
83 ZSTD_paramSwitch_e useRowMatchFinder; /* Indicates whether the CDict was created with params that would use
84 * row-based matchfinder. Unless the cdict is reloaded, we will use
85 * the same greedy/lazy matchfinder at compression time.
86 */
87 }; /* typedef'd to ZSTD_CDict within "zstd.h" */
88
89 ZSTD_CCtx* ZSTD_createCCtx(void)
90 {
91 return ZSTD_createCCtx_advanced(ZSTD_defaultCMem);
92 }
93
94 static void ZSTD_initCCtx(ZSTD_CCtx* cctx, ZSTD_customMem memManager)
95 {
96 assert(cctx != NULL);
97 ZSTD_memset(cctx, 0, sizeof(*cctx));
98 cctx->customMem = memManager;
99 cctx->bmi2 = ZSTD_cpuSupportsBmi2();
100 { size_t const err = ZSTD_CCtx_reset(cctx, ZSTD_reset_parameters);
101 assert(!ZSTD_isError(err));
102 (void)err;
103 }
104 }
105
106 ZSTD_CCtx* ZSTD_createCCtx_advanced(ZSTD_customMem customMem)
107 {
108 ZSTD_STATIC_ASSERT(zcss_init==0);
109 ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_UNKNOWN==(0ULL - 1));
110 if ((!customMem.customAlloc) ^ (!customMem.customFree)) return NULL;
111 { ZSTD_CCtx* const cctx = (ZSTD_CCtx*)ZSTD_customMalloc(sizeof(ZSTD_CCtx), customMem);
112 if (!cctx) return NULL;
113 ZSTD_initCCtx(cctx, customMem);
114 return cctx;
115 }
116 }
117
118 ZSTD_CCtx* ZSTD_initStaticCCtx(void* workspace, size_t workspaceSize)
119 {
120 ZSTD_cwksp ws;
121 ZSTD_CCtx* cctx;
122 if (workspaceSize <= sizeof(ZSTD_CCtx)) return NULL; /* minimum size */
123 if ((size_t)workspace & 7) return NULL; /* must be 8-aligned */
124 ZSTD_cwksp_init(&ws, workspace, workspaceSize, ZSTD_cwksp_static_alloc);
125
126 cctx = (ZSTD_CCtx*)ZSTD_cwksp_reserve_object(&ws, sizeof(ZSTD_CCtx));
127 if (cctx == NULL) return NULL;
128
129 ZSTD_memset(cctx, 0, sizeof(ZSTD_CCtx));
130 ZSTD_cwksp_move(&cctx->workspace, &ws);
131 cctx->staticSize = workspaceSize;
132
133 /* statically sized space. entropyWorkspace never moves (but prev/next block swap places) */
134 if (!ZSTD_cwksp_check_available(&cctx->workspace, ENTROPY_WORKSPACE_SIZE + 2 * sizeof(ZSTD_compressedBlockState_t))) return NULL;
135 cctx->blockState.prevCBlock = (ZSTD_compressedBlockState_t*)ZSTD_cwksp_reserve_object(&cctx->workspace, sizeof(ZSTD_compressedBlockState_t));
136 cctx->blockState.nextCBlock = (ZSTD_compressedBlockState_t*)ZSTD_cwksp_reserve_object(&cctx->workspace, sizeof(ZSTD_compressedBlockState_t));
137 cctx->entropyWorkspace = (U32*)ZSTD_cwksp_reserve_object(&cctx->workspace, ENTROPY_WORKSPACE_SIZE);
138 cctx->bmi2 = ZSTD_cpuid_bmi2(ZSTD_cpuid());
139 return cctx;
140 }
141
142 /*
143 * Clears and frees all of the dictionaries in the CCtx.
144 */
145 static void ZSTD_clearAllDicts(ZSTD_CCtx* cctx)
146 {
147 ZSTD_customFree(cctx->localDict.dictBuffer, cctx->customMem);
148 ZSTD_freeCDict(cctx->localDict.cdict);
149 ZSTD_memset(&cctx->localDict, 0, sizeof(cctx->localDict));
150 ZSTD_memset(&cctx->prefixDict, 0, sizeof(cctx->prefixDict));
151 cctx->cdict = NULL;
152 }
153
154 static size_t ZSTD_sizeof_localDict(ZSTD_localDict dict)
155 {
156 size_t const bufferSize = dict.dictBuffer != NULL ? dict.dictSize : 0;
157 size_t const cdictSize = ZSTD_sizeof_CDict(dict.cdict);
158 return bufferSize + cdictSize;
159 }
160
161 static void ZSTD_freeCCtxContent(ZSTD_CCtx* cctx)
162 {
163 assert(cctx != NULL);
164 assert(cctx->staticSize == 0);
165 ZSTD_clearAllDicts(cctx);
166 ZSTD_cwksp_free(&cctx->workspace, cctx->customMem);
167 }
168
169 size_t ZSTD_freeCCtx(ZSTD_CCtx* cctx)
170 {
171 if (cctx==NULL) return 0; /* support free on NULL */
172 RETURN_ERROR_IF(cctx->staticSize, memory_allocation,
173 "not compatible with static CCtx");
174 {
175 int cctxInWorkspace = ZSTD_cwksp_owns_buffer(&cctx->workspace, cctx);
176 ZSTD_freeCCtxContent(cctx);
177 if (!cctxInWorkspace) {
178 ZSTD_customFree(cctx, cctx->customMem);
179 }
180 }
181 return 0;
182 }
183
184
185 static size_t ZSTD_sizeof_mtctx(const ZSTD_CCtx* cctx)
186 {
187 (void)cctx;
188 return 0;
189 }
190
191
192 size_t ZSTD_sizeof_CCtx(const ZSTD_CCtx* cctx)
193 {
194 if (cctx==NULL) return 0; /* support sizeof on NULL */
195 /* cctx may be in the workspace */
196 return (cctx->workspace.workspace == cctx ? 0 : sizeof(*cctx))
197 + ZSTD_cwksp_sizeof(&cctx->workspace)
198 + ZSTD_sizeof_localDict(cctx->localDict)
199 + ZSTD_sizeof_mtctx(cctx);
200 }
201
202 size_t ZSTD_sizeof_CStream(const ZSTD_CStream* zcs)
203 {
204 return ZSTD_sizeof_CCtx(zcs); /* same object */
205 }
206
207 /* private API call, for dictBuilder only */
208 const seqStore_t* ZSTD_getSeqStore(const ZSTD_CCtx* ctx) { return &(ctx->seqStore); }
209
210 /* Returns true if the strategy supports using a row based matchfinder */
211 static int ZSTD_rowMatchFinderSupported(const ZSTD_strategy strategy) {
212 return (strategy >= ZSTD_greedy && strategy <= ZSTD_lazy2);
213 }
214
215 /* Returns true if the strategy and useRowMatchFinder mode indicate that we will use the row based matchfinder
216 * for this compression.
217 */
218 static int ZSTD_rowMatchFinderUsed(const ZSTD_strategy strategy, const ZSTD_paramSwitch_e mode) {
219 assert(mode != ZSTD_ps_auto);
220 return ZSTD_rowMatchFinderSupported(strategy) && (mode == ZSTD_ps_enable);
221 }
222
223 /* Returns row matchfinder usage given an initial mode and cParams */
224 static ZSTD_paramSwitch_e ZSTD_resolveRowMatchFinderMode(ZSTD_paramSwitch_e mode,
225 const ZSTD_compressionParameters* const cParams) {
226 #if defined(ZSTD_ARCH_X86_SSE2) || defined(ZSTD_ARCH_ARM_NEON)
227 int const kHasSIMD128 = 1;
228 #else
229 int const kHasSIMD128 = 0;
230 #endif
231 if (mode != ZSTD_ps_auto) return mode; /* if requested enabled, but no SIMD, we still will use row matchfinder */
232 mode = ZSTD_ps_disable;
233 if (!ZSTD_rowMatchFinderSupported(cParams->strategy)) return mode;
234 if (kHasSIMD128) {
235 if (cParams->windowLog > 14) mode = ZSTD_ps_enable;
236 } else {
237 if (cParams->windowLog > 17) mode = ZSTD_ps_enable;
238 }
239 return mode;
240 }
241
242 /* Returns block splitter usage (generally speaking, when using slower/stronger compression modes) */
243 static ZSTD_paramSwitch_e ZSTD_resolveBlockSplitterMode(ZSTD_paramSwitch_e mode,
244 const ZSTD_compressionParameters* const cParams) {
245 if (mode != ZSTD_ps_auto) return mode;
246 return (cParams->strategy >= ZSTD_btopt && cParams->windowLog >= 17) ? ZSTD_ps_enable : ZSTD_ps_disable;
247 }
248
249 /* Returns 1 if the arguments indicate that we should allocate a chainTable, 0 otherwise */
250 static int ZSTD_allocateChainTable(const ZSTD_strategy strategy,
251 const ZSTD_paramSwitch_e useRowMatchFinder,
252 const U32 forDDSDict) {
253 assert(useRowMatchFinder != ZSTD_ps_auto);
254 /* We always should allocate a chaintable if we are allocating a matchstate for a DDS dictionary matchstate.
255 * We do not allocate a chaintable if we are using ZSTD_fast, or are using the row-based matchfinder.
256 */
257 return forDDSDict || ((strategy != ZSTD_fast) && !ZSTD_rowMatchFinderUsed(strategy, useRowMatchFinder));
258 }
259
260 /* Returns 1 if compression parameters are such that we should
261 * enable long distance matching (wlog >= 27, strategy >= btopt).
262 * Returns 0 otherwise.
263 */
264 static ZSTD_paramSwitch_e ZSTD_resolveEnableLdm(ZSTD_paramSwitch_e mode,
265 const ZSTD_compressionParameters* const cParams) {
266 if (mode != ZSTD_ps_auto) return mode;
267 return (cParams->strategy >= ZSTD_btopt && cParams->windowLog >= 27) ? ZSTD_ps_enable : ZSTD_ps_disable;
268 }
269
270 static ZSTD_CCtx_params ZSTD_makeCCtxParamsFromCParams(
271 ZSTD_compressionParameters cParams)
272 {
273 ZSTD_CCtx_params cctxParams;
274 /* should not matter, as all cParams are presumed properly defined */
275 ZSTD_CCtxParams_init(&cctxParams, ZSTD_CLEVEL_DEFAULT);
276 cctxParams.cParams = cParams;
277
278 /* Adjust advanced params according to cParams */
279 cctxParams.ldmParams.enableLdm = ZSTD_resolveEnableLdm(cctxParams.ldmParams.enableLdm, &cParams);
280 if (cctxParams.ldmParams.enableLdm == ZSTD_ps_enable) {
281 ZSTD_ldm_adjustParameters(&cctxParams.ldmParams, &cParams);
282 assert(cctxParams.ldmParams.hashLog >= cctxParams.ldmParams.bucketSizeLog);
283 assert(cctxParams.ldmParams.hashRateLog < 32);
284 }
285 cctxParams.useBlockSplitter = ZSTD_resolveBlockSplitterMode(cctxParams.useBlockSplitter, &cParams);
286 cctxParams.useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(cctxParams.useRowMatchFinder, &cParams);
287 assert(!ZSTD_checkCParams(cParams));
288 return cctxParams;
289 }
290
291 static ZSTD_CCtx_params* ZSTD_createCCtxParams_advanced(
292 ZSTD_customMem customMem)
293 {
294 ZSTD_CCtx_params* params;
295 if ((!customMem.customAlloc) ^ (!customMem.customFree)) return NULL;
296 params = (ZSTD_CCtx_params*)ZSTD_customCalloc(
297 sizeof(ZSTD_CCtx_params), customMem);
298 if (!params) { return NULL; }
299 ZSTD_CCtxParams_init(params, ZSTD_CLEVEL_DEFAULT);
300 params->customMem = customMem;
301 return params;
302 }
303
304 ZSTD_CCtx_params* ZSTD_createCCtxParams(void)
305 {
306 return ZSTD_createCCtxParams_advanced(ZSTD_defaultCMem);
307 }
308
309 size_t ZSTD_freeCCtxParams(ZSTD_CCtx_params* params)
310 {
311 if (params == NULL) { return 0; }
312 ZSTD_customFree(params, params->customMem);
313 return 0;
314 }
315
316 size_t ZSTD_CCtxParams_reset(ZSTD_CCtx_params* params)
317 {
318 return ZSTD_CCtxParams_init(params, ZSTD_CLEVEL_DEFAULT);
319 }
320
321 size_t ZSTD_CCtxParams_init(ZSTD_CCtx_params* cctxParams, int compressionLevel) {
322 RETURN_ERROR_IF(!cctxParams, GENERIC, "NULL pointer!");
323 ZSTD_memset(cctxParams, 0, sizeof(*cctxParams));
324 cctxParams->compressionLevel = compressionLevel;
325 cctxParams->fParams.contentSizeFlag = 1;
326 return 0;
327 }
328
329 #define ZSTD_NO_CLEVEL 0
330
331 /*
332 * Initializes the cctxParams from params and compressionLevel.
333 * @param compressionLevel If params are derived from a compression level then that compression level, otherwise ZSTD_NO_CLEVEL.
334 */
335 static void ZSTD_CCtxParams_init_internal(ZSTD_CCtx_params* cctxParams, ZSTD_parameters const* params, int compressionLevel)
336 {
337 assert(!ZSTD_checkCParams(params->cParams));
338 ZSTD_memset(cctxParams, 0, sizeof(*cctxParams));
339 cctxParams->cParams = params->cParams;
340 cctxParams->fParams = params->fParams;
341 /* Should not matter, as all cParams are presumed properly defined.
342 * But, set it for tracing anyway.
343 */
344 cctxParams->compressionLevel = compressionLevel;
345 cctxParams->useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(cctxParams->useRowMatchFinder, ¶ms->cParams);
346 cctxParams->useBlockSplitter = ZSTD_resolveBlockSplitterMode(cctxParams->useBlockSplitter, ¶ms->cParams);
347 cctxParams->ldmParams.enableLdm = ZSTD_resolveEnableLdm(cctxParams->ldmParams.enableLdm, ¶ms->cParams);
348 DEBUGLOG(4, "ZSTD_CCtxParams_init_internal: useRowMatchFinder=%d, useBlockSplitter=%d ldm=%d",
349 cctxParams->useRowMatchFinder, cctxParams->useBlockSplitter, cctxParams->ldmParams.enableLdm);
350 }
351
352 size_t ZSTD_CCtxParams_init_advanced(ZSTD_CCtx_params* cctxParams, ZSTD_parameters params)
353 {
354 RETURN_ERROR_IF(!cctxParams, GENERIC, "NULL pointer!");
355 FORWARD_IF_ERROR( ZSTD_checkCParams(params.cParams) , "");
356 ZSTD_CCtxParams_init_internal(cctxParams, ¶ms, ZSTD_NO_CLEVEL);
357 return 0;
358 }
359
360 /*
361 * Sets cctxParams' cParams and fParams from params, but otherwise leaves them alone.
362 * @param param Validated zstd parameters.
363 */
364 static void ZSTD_CCtxParams_setZstdParams(
365 ZSTD_CCtx_params* cctxParams, const ZSTD_parameters* params)
366 {
367 assert(!ZSTD_checkCParams(params->cParams));
368 cctxParams->cParams = params->cParams;
369 cctxParams->fParams = params->fParams;
370 /* Should not matter, as all cParams are presumed properly defined.
371 * But, set it for tracing anyway.
372 */
373 cctxParams->compressionLevel = ZSTD_NO_CLEVEL;
374 }
375
376 ZSTD_bounds ZSTD_cParam_getBounds(ZSTD_cParameter param)
377 {
378 ZSTD_bounds bounds = { 0, 0, 0 };
379
380 switch(param)
381 {
382 case ZSTD_c_compressionLevel:
383 bounds.lowerBound = ZSTD_minCLevel();
384 bounds.upperBound = ZSTD_maxCLevel();
385 return bounds;
386
387 case ZSTD_c_windowLog:
388 bounds.lowerBound = ZSTD_WINDOWLOG_MIN;
389 bounds.upperBound = ZSTD_WINDOWLOG_MAX;
390 return bounds;
391
392 case ZSTD_c_hashLog:
393 bounds.lowerBound = ZSTD_HASHLOG_MIN;
394 bounds.upperBound = ZSTD_HASHLOG_MAX;
395 return bounds;
396
397 case ZSTD_c_chainLog:
398 bounds.lowerBound = ZSTD_CHAINLOG_MIN;
399 bounds.upperBound = ZSTD_CHAINLOG_MAX;
400 return bounds;
401
402 case ZSTD_c_searchLog:
403 bounds.lowerBound = ZSTD_SEARCHLOG_MIN;
404 bounds.upperBound = ZSTD_SEARCHLOG_MAX;
405 return bounds;
406
407 case ZSTD_c_minMatch:
408 bounds.lowerBound = ZSTD_MINMATCH_MIN;
409 bounds.upperBound = ZSTD_MINMATCH_MAX;
410 return bounds;
411
412 case ZSTD_c_targetLength:
413 bounds.lowerBound = ZSTD_TARGETLENGTH_MIN;
414 bounds.upperBound = ZSTD_TARGETLENGTH_MAX;
415 return bounds;
416
417 case ZSTD_c_strategy:
418 bounds.lowerBound = ZSTD_STRATEGY_MIN;
419 bounds.upperBound = ZSTD_STRATEGY_MAX;
420 return bounds;
421
422 case ZSTD_c_contentSizeFlag:
423 bounds.lowerBound = 0;
424 bounds.upperBound = 1;
425 return bounds;
426
427 case ZSTD_c_checksumFlag:
428 bounds.lowerBound = 0;
429 bounds.upperBound = 1;
430 return bounds;
431
432 case ZSTD_c_dictIDFlag:
433 bounds.lowerBound = 0;
434 bounds.upperBound = 1;
435 return bounds;
436
437 case ZSTD_c_nbWorkers:
438 bounds.lowerBound = 0;
439 bounds.upperBound = 0;
440 return bounds;
441
442 case ZSTD_c_jobSize:
443 bounds.lowerBound = 0;
444 bounds.upperBound = 0;
445 return bounds;
446
447 case ZSTD_c_overlapLog:
448 bounds.lowerBound = 0;
449 bounds.upperBound = 0;
450 return bounds;
451
452 case ZSTD_c_enableDedicatedDictSearch:
453 bounds.lowerBound = 0;
454 bounds.upperBound = 1;
455 return bounds;
456
457 case ZSTD_c_enableLongDistanceMatching:
458 bounds.lowerBound = 0;
459 bounds.upperBound = 1;
460 return bounds;
461
462 case ZSTD_c_ldmHashLog:
463 bounds.lowerBound = ZSTD_LDM_HASHLOG_MIN;
464 bounds.upperBound = ZSTD_LDM_HASHLOG_MAX;
465 return bounds;
466
467 case ZSTD_c_ldmMinMatch:
468 bounds.lowerBound = ZSTD_LDM_MINMATCH_MIN;
469 bounds.upperBound = ZSTD_LDM_MINMATCH_MAX;
470 return bounds;
471
472 case ZSTD_c_ldmBucketSizeLog:
473 bounds.lowerBound = ZSTD_LDM_BUCKETSIZELOG_MIN;
474 bounds.upperBound = ZSTD_LDM_BUCKETSIZELOG_MAX;
475 return bounds;
476
477 case ZSTD_c_ldmHashRateLog:
478 bounds.lowerBound = ZSTD_LDM_HASHRATELOG_MIN;
479 bounds.upperBound = ZSTD_LDM_HASHRATELOG_MAX;
480 return bounds;
481
482 /* experimental parameters */
483 case ZSTD_c_rsyncable:
484 bounds.lowerBound = 0;
485 bounds.upperBound = 1;
486 return bounds;
487
488 case ZSTD_c_forceMaxWindow :
489 bounds.lowerBound = 0;
490 bounds.upperBound = 1;
491 return bounds;
492
493 case ZSTD_c_format:
494 ZSTD_STATIC_ASSERT(ZSTD_f_zstd1 < ZSTD_f_zstd1_magicless);
495 bounds.lowerBound = ZSTD_f_zstd1;
496 bounds.upperBound = ZSTD_f_zstd1_magicless; /* note : how to ensure at compile time that this is the highest value enum ? */
497 return bounds;
498
499 case ZSTD_c_forceAttachDict:
500 ZSTD_STATIC_ASSERT(ZSTD_dictDefaultAttach < ZSTD_dictForceLoad);
501 bounds.lowerBound = ZSTD_dictDefaultAttach;
502 bounds.upperBound = ZSTD_dictForceLoad; /* note : how to ensure at compile time that this is the highest value enum ? */
503 return bounds;
504
505 case ZSTD_c_literalCompressionMode:
506 ZSTD_STATIC_ASSERT(ZSTD_ps_auto < ZSTD_ps_enable && ZSTD_ps_enable < ZSTD_ps_disable);
507 bounds.lowerBound = (int)ZSTD_ps_auto;
508 bounds.upperBound = (int)ZSTD_ps_disable;
509 return bounds;
510
511 case ZSTD_c_targetCBlockSize:
512 bounds.lowerBound = ZSTD_TARGETCBLOCKSIZE_MIN;
513 bounds.upperBound = ZSTD_TARGETCBLOCKSIZE_MAX;
514 return bounds;
515
516 case ZSTD_c_srcSizeHint:
517 bounds.lowerBound = ZSTD_SRCSIZEHINT_MIN;
518 bounds.upperBound = ZSTD_SRCSIZEHINT_MAX;
519 return bounds;
520
521 case ZSTD_c_stableInBuffer:
522 case ZSTD_c_stableOutBuffer:
523 bounds.lowerBound = (int)ZSTD_bm_buffered;
524 bounds.upperBound = (int)ZSTD_bm_stable;
525 return bounds;
526
527 case ZSTD_c_blockDelimiters:
528 bounds.lowerBound = (int)ZSTD_sf_noBlockDelimiters;
529 bounds.upperBound = (int)ZSTD_sf_explicitBlockDelimiters;
530 return bounds;
531
532 case ZSTD_c_validateSequences:
533 bounds.lowerBound = 0;
534 bounds.upperBound = 1;
535 return bounds;
536
537 case ZSTD_c_useBlockSplitter:
538 bounds.lowerBound = (int)ZSTD_ps_auto;
539 bounds.upperBound = (int)ZSTD_ps_disable;
540 return bounds;
541
542 case ZSTD_c_useRowMatchFinder:
543 bounds.lowerBound = (int)ZSTD_ps_auto;
544 bounds.upperBound = (int)ZSTD_ps_disable;
545 return bounds;
546
547 case ZSTD_c_deterministicRefPrefix:
548 bounds.lowerBound = 0;
549 bounds.upperBound = 1;
550 return bounds;
551
552 default:
553 bounds.error = ERROR(parameter_unsupported);
554 return bounds;
555 }
556 }
557
558 /* ZSTD_cParam_clampBounds:
559 * Clamps the value into the bounded range.
560 */
561 static size_t ZSTD_cParam_clampBounds(ZSTD_cParameter cParam, int* value)
562 {
563 ZSTD_bounds const bounds = ZSTD_cParam_getBounds(cParam);
564 if (ZSTD_isError(bounds.error)) return bounds.error;
565 if (*value < bounds.lowerBound) *value = bounds.lowerBound;
566 if (*value > bounds.upperBound) *value = bounds.upperBound;
567 return 0;
568 }
569
570 #define BOUNDCHECK(cParam, val) { \
571 RETURN_ERROR_IF(!ZSTD_cParam_withinBounds(cParam,val), \
572 parameter_outOfBound, "Param out of bounds"); \
573 }
574
575
576 static int ZSTD_isUpdateAuthorized(ZSTD_cParameter param)
577 {
578 switch(param)
579 {
580 case ZSTD_c_compressionLevel:
581 case ZSTD_c_hashLog:
582 case ZSTD_c_chainLog:
583 case ZSTD_c_searchLog:
584 case ZSTD_c_minMatch:
585 case ZSTD_c_targetLength:
586 case ZSTD_c_strategy:
587 return 1;
588
589 case ZSTD_c_format:
590 case ZSTD_c_windowLog:
591 case ZSTD_c_contentSizeFlag:
592 case ZSTD_c_checksumFlag:
593 case ZSTD_c_dictIDFlag:
594 case ZSTD_c_forceMaxWindow :
595 case ZSTD_c_nbWorkers:
596 case ZSTD_c_jobSize:
597 case ZSTD_c_overlapLog:
598 case ZSTD_c_rsyncable:
599 case ZSTD_c_enableDedicatedDictSearch:
600 case ZSTD_c_enableLongDistanceMatching:
601 case ZSTD_c_ldmHashLog:
602 case ZSTD_c_ldmMinMatch:
603 case ZSTD_c_ldmBucketSizeLog:
604 case ZSTD_c_ldmHashRateLog:
605 case ZSTD_c_forceAttachDict:
606 case ZSTD_c_literalCompressionMode:
607 case ZSTD_c_targetCBlockSize:
608 case ZSTD_c_srcSizeHint:
609 case ZSTD_c_stableInBuffer:
610 case ZSTD_c_stableOutBuffer:
611 case ZSTD_c_blockDelimiters:
612 case ZSTD_c_validateSequences:
613 case ZSTD_c_useBlockSplitter:
614 case ZSTD_c_useRowMatchFinder:
615 case ZSTD_c_deterministicRefPrefix:
616 default:
617 return 0;
618 }
619 }
620
621 size_t ZSTD_CCtx_setParameter(ZSTD_CCtx* cctx, ZSTD_cParameter param, int value)
622 {
623 DEBUGLOG(4, "ZSTD_CCtx_setParameter (%i, %i)", (int)param, value);
624 if (cctx->streamStage != zcss_init) {
625 if (ZSTD_isUpdateAuthorized(param)) {
626 cctx->cParamsChanged = 1;
627 } else {
628 RETURN_ERROR(stage_wrong, "can only set params in ctx init stage");
629 } }
630
631 switch(param)
632 {
633 case ZSTD_c_nbWorkers:
634 RETURN_ERROR_IF((value!=0) && cctx->staticSize, parameter_unsupported,
635 "MT not compatible with static alloc");
636 break;
637
638 case ZSTD_c_compressionLevel:
639 case ZSTD_c_windowLog:
640 case ZSTD_c_hashLog:
641 case ZSTD_c_chainLog:
642 case ZSTD_c_searchLog:
643 case ZSTD_c_minMatch:
644 case ZSTD_c_targetLength:
645 case ZSTD_c_strategy:
646 case ZSTD_c_ldmHashRateLog:
647 case ZSTD_c_format:
648 case ZSTD_c_contentSizeFlag:
649 case ZSTD_c_checksumFlag:
650 case ZSTD_c_dictIDFlag:
651 case ZSTD_c_forceMaxWindow:
652 case ZSTD_c_forceAttachDict:
653 case ZSTD_c_literalCompressionMode:
654 case ZSTD_c_jobSize:
655 case ZSTD_c_overlapLog:
656 case ZSTD_c_rsyncable:
657 case ZSTD_c_enableDedicatedDictSearch:
658 case ZSTD_c_enableLongDistanceMatching:
659 case ZSTD_c_ldmHashLog:
660 case ZSTD_c_ldmMinMatch:
661 case ZSTD_c_ldmBucketSizeLog:
662 case ZSTD_c_targetCBlockSize:
663 case ZSTD_c_srcSizeHint:
664 case ZSTD_c_stableInBuffer:
665 case ZSTD_c_stableOutBuffer:
666 case ZSTD_c_blockDelimiters:
667 case ZSTD_c_validateSequences:
668 case ZSTD_c_useBlockSplitter:
669 case ZSTD_c_useRowMatchFinder:
670 case ZSTD_c_deterministicRefPrefix:
671 break;
672
673 default: RETURN_ERROR(parameter_unsupported, "unknown parameter");
674 }
675 return ZSTD_CCtxParams_setParameter(&cctx->requestedParams, param, value);
676 }
677
678 size_t ZSTD_CCtxParams_setParameter(ZSTD_CCtx_params* CCtxParams,
679 ZSTD_cParameter param, int value)
680 {
681 DEBUGLOG(4, "ZSTD_CCtxParams_setParameter (%i, %i)", (int)param, value);
682 switch(param)
683 {
684 case ZSTD_c_format :
685 BOUNDCHECK(ZSTD_c_format, value);
686 CCtxParams->format = (ZSTD_format_e)value;
687 return (size_t)CCtxParams->format;
688
689 case ZSTD_c_compressionLevel : {
690 FORWARD_IF_ERROR(ZSTD_cParam_clampBounds(param, &value), "");
691 if (value == 0)
692 CCtxParams->compressionLevel = ZSTD_CLEVEL_DEFAULT; /* 0 == default */
693 else
694 CCtxParams->compressionLevel = value;
695 if (CCtxParams->compressionLevel >= 0) return (size_t)CCtxParams->compressionLevel;
696 return 0; /* return type (size_t) cannot represent negative values */
697 }
698
699 case ZSTD_c_windowLog :
700 if (value!=0) /* 0 => use default */
701 BOUNDCHECK(ZSTD_c_windowLog, value);
702 CCtxParams->cParams.windowLog = (U32)value;
703 return CCtxParams->cParams.windowLog;
704
705 case ZSTD_c_hashLog :
706 if (value!=0) /* 0 => use default */
707 BOUNDCHECK(ZSTD_c_hashLog, value);
708 CCtxParams->cParams.hashLog = (U32)value;
709 return CCtxParams->cParams.hashLog;
710
711 case ZSTD_c_chainLog :
712 if (value!=0) /* 0 => use default */
713 BOUNDCHECK(ZSTD_c_chainLog, value);
714 CCtxParams->cParams.chainLog = (U32)value;
715 return CCtxParams->cParams.chainLog;
716
717 case ZSTD_c_searchLog :
718 if (value!=0) /* 0 => use default */
719 BOUNDCHECK(ZSTD_c_searchLog, value);
720 CCtxParams->cParams.searchLog = (U32)value;
721 return (size_t)value;
722
723 case ZSTD_c_minMatch :
724 if (value!=0) /* 0 => use default */
725 BOUNDCHECK(ZSTD_c_minMatch, value);
726 CCtxParams->cParams.minMatch = value;
727 return CCtxParams->cParams.minMatch;
728
729 case ZSTD_c_targetLength :
730 BOUNDCHECK(ZSTD_c_targetLength, value);
731 CCtxParams->cParams.targetLength = value;
732 return CCtxParams->cParams.targetLength;
733
734 case ZSTD_c_strategy :
735 if (value!=0) /* 0 => use default */
736 BOUNDCHECK(ZSTD_c_strategy, value);
737 CCtxParams->cParams.strategy = (ZSTD_strategy)value;
738 return (size_t)CCtxParams->cParams.strategy;
739
740 case ZSTD_c_contentSizeFlag :
741 /* Content size written in frame header _when known_ (default:1) */
742 DEBUGLOG(4, "set content size flag = %u", (value!=0));
743 CCtxParams->fParams.contentSizeFlag = value != 0;
744 return CCtxParams->fParams.contentSizeFlag;
745
746 case ZSTD_c_checksumFlag :
747 /* A 32-bits content checksum will be calculated and written at end of frame (default:0) */
748 CCtxParams->fParams.checksumFlag = value != 0;
749 return CCtxParams->fParams.checksumFlag;
750
751 case ZSTD_c_dictIDFlag : /* When applicable, dictionary's dictID is provided in frame header (default:1) */
752 DEBUGLOG(4, "set dictIDFlag = %u", (value!=0));
753 CCtxParams->fParams.noDictIDFlag = !value;
754 return !CCtxParams->fParams.noDictIDFlag;
755
756 case ZSTD_c_forceMaxWindow :
757 CCtxParams->forceWindow = (value != 0);
758 return CCtxParams->forceWindow;
759
760 case ZSTD_c_forceAttachDict : {
761 const ZSTD_dictAttachPref_e pref = (ZSTD_dictAttachPref_e)value;
762 BOUNDCHECK(ZSTD_c_forceAttachDict, pref);
763 CCtxParams->attachDictPref = pref;
764 return CCtxParams->attachDictPref;
765 }
766
767 case ZSTD_c_literalCompressionMode : {
768 const ZSTD_paramSwitch_e lcm = (ZSTD_paramSwitch_e)value;
769 BOUNDCHECK(ZSTD_c_literalCompressionMode, lcm);
770 CCtxParams->literalCompressionMode = lcm;
771 return CCtxParams->literalCompressionMode;
772 }
773
774 case ZSTD_c_nbWorkers :
775 RETURN_ERROR_IF(value!=0, parameter_unsupported, "not compiled with multithreading");
776 return 0;
777
778 case ZSTD_c_jobSize :
779 RETURN_ERROR_IF(value!=0, parameter_unsupported, "not compiled with multithreading");
780 return 0;
781
782 case ZSTD_c_overlapLog :
783 RETURN_ERROR_IF(value!=0, parameter_unsupported, "not compiled with multithreading");
784 return 0;
785
786 case ZSTD_c_rsyncable :
787 RETURN_ERROR_IF(value!=0, parameter_unsupported, "not compiled with multithreading");
788 return 0;
789
790 case ZSTD_c_enableDedicatedDictSearch :
791 CCtxParams->enableDedicatedDictSearch = (value!=0);
792 return CCtxParams->enableDedicatedDictSearch;
793
794 case ZSTD_c_enableLongDistanceMatching :
795 CCtxParams->ldmParams.enableLdm = (ZSTD_paramSwitch_e)value;
796 return CCtxParams->ldmParams.enableLdm;
797
798 case ZSTD_c_ldmHashLog :
799 if (value!=0) /* 0 ==> auto */
800 BOUNDCHECK(ZSTD_c_ldmHashLog, value);
801 CCtxParams->ldmParams.hashLog = value;
802 return CCtxParams->ldmParams.hashLog;
803
804 case ZSTD_c_ldmMinMatch :
805 if (value!=0) /* 0 ==> default */
806 BOUNDCHECK(ZSTD_c_ldmMinMatch, value);
807 CCtxParams->ldmParams.minMatchLength = value;
808 return CCtxParams->ldmParams.minMatchLength;
809
810 case ZSTD_c_ldmBucketSizeLog :
811 if (value!=0) /* 0 ==> default */
812 BOUNDCHECK(ZSTD_c_ldmBucketSizeLog, value);
813 CCtxParams->ldmParams.bucketSizeLog = value;
814 return CCtxParams->ldmParams.bucketSizeLog;
815
816 case ZSTD_c_ldmHashRateLog :
817 if (value!=0) /* 0 ==> default */
818 BOUNDCHECK(ZSTD_c_ldmHashRateLog, value);
819 CCtxParams->ldmParams.hashRateLog = value;
820 return CCtxParams->ldmParams.hashRateLog;
821
822 case ZSTD_c_targetCBlockSize :
823 if (value!=0) /* 0 ==> default */
824 BOUNDCHECK(ZSTD_c_targetCBlockSize, value);
825 CCtxParams->targetCBlockSize = value;
826 return CCtxParams->targetCBlockSize;
827
828 case ZSTD_c_srcSizeHint :
829 if (value!=0) /* 0 ==> default */
830 BOUNDCHECK(ZSTD_c_srcSizeHint, value);
831 CCtxParams->srcSizeHint = value;
832 return CCtxParams->srcSizeHint;
833
834 case ZSTD_c_stableInBuffer:
835 BOUNDCHECK(ZSTD_c_stableInBuffer, value);
836 CCtxParams->inBufferMode = (ZSTD_bufferMode_e)value;
837 return CCtxParams->inBufferMode;
838
839 case ZSTD_c_stableOutBuffer:
840 BOUNDCHECK(ZSTD_c_stableOutBuffer, value);
841 CCtxParams->outBufferMode = (ZSTD_bufferMode_e)value;
842 return CCtxParams->outBufferMode;
843
844 case ZSTD_c_blockDelimiters:
845 BOUNDCHECK(ZSTD_c_blockDelimiters, value);
846 CCtxParams->blockDelimiters = (ZSTD_sequenceFormat_e)value;
847 return CCtxParams->blockDelimiters;
848
849 case ZSTD_c_validateSequences:
850 BOUNDCHECK(ZSTD_c_validateSequences, value);
851 CCtxParams->validateSequences = value;
852 return CCtxParams->validateSequences;
853
854 case ZSTD_c_useBlockSplitter:
855 BOUNDCHECK(ZSTD_c_useBlockSplitter, value);
856 CCtxParams->useBlockSplitter = (ZSTD_paramSwitch_e)value;
857 return CCtxParams->useBlockSplitter;
858
859 case ZSTD_c_useRowMatchFinder:
860 BOUNDCHECK(ZSTD_c_useRowMatchFinder, value);
861 CCtxParams->useRowMatchFinder = (ZSTD_paramSwitch_e)value;
862 return CCtxParams->useRowMatchFinder;
863
864 case ZSTD_c_deterministicRefPrefix:
865 BOUNDCHECK(ZSTD_c_deterministicRefPrefix, value);
866 CCtxParams->deterministicRefPrefix = !!value;
867 return CCtxParams->deterministicRefPrefix;
868
869 default: RETURN_ERROR(parameter_unsupported, "unknown parameter");
870 }
871 }
872
873 size_t ZSTD_CCtx_getParameter(ZSTD_CCtx const* cctx, ZSTD_cParameter param, int* value)
874 {
875 return ZSTD_CCtxParams_getParameter(&cctx->requestedParams, param, value);
876 }
877
878 size_t ZSTD_CCtxParams_getParameter(
879 ZSTD_CCtx_params const* CCtxParams, ZSTD_cParameter param, int* value)
880 {
881 switch(param)
882 {
883 case ZSTD_c_format :
884 *value = CCtxParams->format;
885 break;
886 case ZSTD_c_compressionLevel :
887 *value = CCtxParams->compressionLevel;
888 break;
889 case ZSTD_c_windowLog :
890 *value = (int)CCtxParams->cParams.windowLog;
891 break;
892 case ZSTD_c_hashLog :
893 *value = (int)CCtxParams->cParams.hashLog;
894 break;
895 case ZSTD_c_chainLog :
896 *value = (int)CCtxParams->cParams.chainLog;
897 break;
898 case ZSTD_c_searchLog :
899 *value = CCtxParams->cParams.searchLog;
900 break;
901 case ZSTD_c_minMatch :
902 *value = CCtxParams->cParams.minMatch;
903 break;
904 case ZSTD_c_targetLength :
905 *value = CCtxParams->cParams.targetLength;
906 break;
907 case ZSTD_c_strategy :
908 *value = (unsigned)CCtxParams->cParams.strategy;
909 break;
910 case ZSTD_c_contentSizeFlag :
911 *value = CCtxParams->fParams.contentSizeFlag;
912 break;
913 case ZSTD_c_checksumFlag :
914 *value = CCtxParams->fParams.checksumFlag;
915 break;
916 case ZSTD_c_dictIDFlag :
917 *value = !CCtxParams->fParams.noDictIDFlag;
918 break;
919 case ZSTD_c_forceMaxWindow :
920 *value = CCtxParams->forceWindow;
921 break;
922 case ZSTD_c_forceAttachDict :
923 *value = CCtxParams->attachDictPref;
924 break;
925 case ZSTD_c_literalCompressionMode :
926 *value = CCtxParams->literalCompressionMode;
927 break;
928 case ZSTD_c_nbWorkers :
929 assert(CCtxParams->nbWorkers == 0);
930 *value = CCtxParams->nbWorkers;
931 break;
932 case ZSTD_c_jobSize :
933 RETURN_ERROR(parameter_unsupported, "not compiled with multithreading");
934 case ZSTD_c_overlapLog :
935 RETURN_ERROR(parameter_unsupported, "not compiled with multithreading");
936 case ZSTD_c_rsyncable :
937 RETURN_ERROR(parameter_unsupported, "not compiled with multithreading");
938 case ZSTD_c_enableDedicatedDictSearch :
939 *value = CCtxParams->enableDedicatedDictSearch;
940 break;
941 case ZSTD_c_enableLongDistanceMatching :
942 *value = CCtxParams->ldmParams.enableLdm;
943 break;
944 case ZSTD_c_ldmHashLog :
945 *value = CCtxParams->ldmParams.hashLog;
946 break;
947 case ZSTD_c_ldmMinMatch :
948 *value = CCtxParams->ldmParams.minMatchLength;
949 break;
950 case ZSTD_c_ldmBucketSizeLog :
951 *value = CCtxParams->ldmParams.bucketSizeLog;
952 break;
953 case ZSTD_c_ldmHashRateLog :
954 *value = CCtxParams->ldmParams.hashRateLog;
955 break;
956 case ZSTD_c_targetCBlockSize :
957 *value = (int)CCtxParams->targetCBlockSize;
958 break;
959 case ZSTD_c_srcSizeHint :
960 *value = (int)CCtxParams->srcSizeHint;
961 break;
962 case ZSTD_c_stableInBuffer :
963 *value = (int)CCtxParams->inBufferMode;
964 break;
965 case ZSTD_c_stableOutBuffer :
966 *value = (int)CCtxParams->outBufferMode;
967 break;
968 case ZSTD_c_blockDelimiters :
969 *value = (int)CCtxParams->blockDelimiters;
970 break;
971 case ZSTD_c_validateSequences :
972 *value = (int)CCtxParams->validateSequences;
973 break;
974 case ZSTD_c_useBlockSplitter :
975 *value = (int)CCtxParams->useBlockSplitter;
976 break;
977 case ZSTD_c_useRowMatchFinder :
978 *value = (int)CCtxParams->useRowMatchFinder;
979 break;
980 case ZSTD_c_deterministicRefPrefix:
981 *value = (int)CCtxParams->deterministicRefPrefix;
982 break;
983 default: RETURN_ERROR(parameter_unsupported, "unknown parameter");
984 }
985 return 0;
986 }
987
988 /* ZSTD_CCtx_setParametersUsingCCtxParams() :
989 * just applies `params` into `cctx`
990 * no action is performed, parameters are merely stored.
991 * If ZSTDMT is enabled, parameters are pushed to cctx->mtctx.
992 * This is possible even if a compression is ongoing.
993 * In which case, new parameters will be applied on the fly, starting with next compression job.
994 */
995 size_t ZSTD_CCtx_setParametersUsingCCtxParams(
996 ZSTD_CCtx* cctx, const ZSTD_CCtx_params* params)
997 {
998 DEBUGLOG(4, "ZSTD_CCtx_setParametersUsingCCtxParams");
999 RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
1000 "The context is in the wrong stage!");
1001 RETURN_ERROR_IF(cctx->cdict, stage_wrong,
1002 "Can't override parameters with cdict attached (some must "
1003 "be inherited from the cdict).");
1004
1005 cctx->requestedParams = *params;
1006 return 0;
1007 }
1008
1009 size_t ZSTD_CCtx_setPledgedSrcSize(ZSTD_CCtx* cctx, unsigned long long pledgedSrcSize)
1010 {
1011 DEBUGLOG(4, "ZSTD_CCtx_setPledgedSrcSize to %u bytes", (U32)pledgedSrcSize);
1012 RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
1013 "Can't set pledgedSrcSize when not in init stage.");
1014 cctx->pledgedSrcSizePlusOne = pledgedSrcSize+1;
1015 return 0;
1016 }
1017
1018 static ZSTD_compressionParameters ZSTD_dedicatedDictSearch_getCParams(
1019 int const compressionLevel,
1020 size_t const dictSize);
1021 static int ZSTD_dedicatedDictSearch_isSupported(
1022 const ZSTD_compressionParameters* cParams);
1023 static void ZSTD_dedicatedDictSearch_revertCParams(
1024 ZSTD_compressionParameters* cParams);
1025
1026 /*
1027 * Initializes the local dict using the requested parameters.
1028 * NOTE: This does not use the pledged src size, because it may be used for more
1029 * than one compression.
1030 */
1031 static size_t ZSTD_initLocalDict(ZSTD_CCtx* cctx)
1032 {
1033 ZSTD_localDict* const dl = &cctx->localDict;
1034 if (dl->dict == NULL) {
1035 /* No local dictionary. */
1036 assert(dl->dictBuffer == NULL);
1037 assert(dl->cdict == NULL);
1038 assert(dl->dictSize == 0);
1039 return 0;
1040 }
1041 if (dl->cdict != NULL) {
1042 assert(cctx->cdict == dl->cdict);
1043 /* Local dictionary already initialized. */
1044 return 0;
1045 }
1046 assert(dl->dictSize > 0);
1047 assert(cctx->cdict == NULL);
1048 assert(cctx->prefixDict.dict == NULL);
1049
1050 dl->cdict = ZSTD_createCDict_advanced2(
1051 dl->dict,
1052 dl->dictSize,
1053 ZSTD_dlm_byRef,
1054 dl->dictContentType,
1055 &cctx->requestedParams,
1056 cctx->customMem);
1057 RETURN_ERROR_IF(!dl->cdict, memory_allocation, "ZSTD_createCDict_advanced failed");
1058 cctx->cdict = dl->cdict;
1059 return 0;
1060 }
1061
1062 size_t ZSTD_CCtx_loadDictionary_advanced(
1063 ZSTD_CCtx* cctx, const void* dict, size_t dictSize,
1064 ZSTD_dictLoadMethod_e dictLoadMethod, ZSTD_dictContentType_e dictContentType)
1065 {
1066 RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
1067 "Can't load a dictionary when ctx is not in init stage.");
1068 DEBUGLOG(4, "ZSTD_CCtx_loadDictionary_advanced (size: %u)", (U32)dictSize);
1069 ZSTD_clearAllDicts(cctx); /* in case one already exists */
1070 if (dict == NULL || dictSize == 0) /* no dictionary mode */
1071 return 0;
1072 if (dictLoadMethod == ZSTD_dlm_byRef) {
1073 cctx->localDict.dict = dict;
1074 } else {
1075 void* dictBuffer;
1076 RETURN_ERROR_IF(cctx->staticSize, memory_allocation,
1077 "no malloc for static CCtx");
1078 dictBuffer = ZSTD_customMalloc(dictSize, cctx->customMem);
1079 RETURN_ERROR_IF(!dictBuffer, memory_allocation, "NULL pointer!");
1080 ZSTD_memcpy(dictBuffer, dict, dictSize);
1081 cctx->localDict.dictBuffer = dictBuffer;
1082 cctx->localDict.dict = dictBuffer;
1083 }
1084 cctx->localDict.dictSize = dictSize;
1085 cctx->localDict.dictContentType = dictContentType;
1086 return 0;
1087 }
1088
1089 size_t ZSTD_CCtx_loadDictionary_byReference(
1090 ZSTD_CCtx* cctx, const void* dict, size_t dictSize)
1091 {
1092 return ZSTD_CCtx_loadDictionary_advanced(
1093 cctx, dict, dictSize, ZSTD_dlm_byRef, ZSTD_dct_auto);
1094 }
1095
1096 size_t ZSTD_CCtx_loadDictionary(ZSTD_CCtx* cctx, const void* dict, size_t dictSize)
1097 {
1098 return ZSTD_CCtx_loadDictionary_advanced(
1099 cctx, dict, dictSize, ZSTD_dlm_byCopy, ZSTD_dct_auto);
1100 }
1101
1102
1103 size_t ZSTD_CCtx_refCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict)
1104 {
1105 RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
1106 "Can't ref a dict when ctx not in init stage.");
1107 /* Free the existing local cdict (if any) to save memory. */
1108 ZSTD_clearAllDicts(cctx);
1109 cctx->cdict = cdict;
1110 return 0;
1111 }
1112
1113 size_t ZSTD_CCtx_refThreadPool(ZSTD_CCtx* cctx, ZSTD_threadPool* pool)
1114 {
1115 RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
1116 "Can't ref a pool when ctx not in init stage.");
1117 cctx->pool = pool;
1118 return 0;
1119 }
1120
1121 size_t ZSTD_CCtx_refPrefix(ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize)
1122 {
1123 return ZSTD_CCtx_refPrefix_advanced(cctx, prefix, prefixSize, ZSTD_dct_rawContent);
1124 }
1125
1126 size_t ZSTD_CCtx_refPrefix_advanced(
1127 ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize, ZSTD_dictContentType_e dictContentType)
1128 {
1129 RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
1130 "Can't ref a prefix when ctx not in init stage.");
1131 ZSTD_clearAllDicts(cctx);
1132 if (prefix != NULL && prefixSize > 0) {
1133 cctx->prefixDict.dict = prefix;
1134 cctx->prefixDict.dictSize = prefixSize;
1135 cctx->prefixDict.dictContentType = dictContentType;
1136 }
1137 return 0;
1138 }
1139
1140 /*! ZSTD_CCtx_reset() :
1141 * Also dumps dictionary */
1142 size_t ZSTD_CCtx_reset(ZSTD_CCtx* cctx, ZSTD_ResetDirective reset)
1143 {
1144 if ( (reset == ZSTD_reset_session_only)
1145 || (reset == ZSTD_reset_session_and_parameters) ) {
1146 cctx->streamStage = zcss_init;
1147 cctx->pledgedSrcSizePlusOne = 0;
1148 }
1149 if ( (reset == ZSTD_reset_parameters)
1150 || (reset == ZSTD_reset_session_and_parameters) ) {
1151 RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
1152 "Can't reset parameters only when not in init stage.");
1153 ZSTD_clearAllDicts(cctx);
1154 return ZSTD_CCtxParams_reset(&cctx->requestedParams);
1155 }
1156 return 0;
1157 }
1158
1159
1160 /* ZSTD_checkCParams() :
1161 control CParam values remain within authorized range.
1162 @return : 0, or an error code if one value is beyond authorized range */
1163 size_t ZSTD_checkCParams(ZSTD_compressionParameters cParams)
1164 {
1165 BOUNDCHECK(ZSTD_c_windowLog, (int)cParams.windowLog);
1166 BOUNDCHECK(ZSTD_c_chainLog, (int)cParams.chainLog);
1167 BOUNDCHECK(ZSTD_c_hashLog, (int)cParams.hashLog);
1168 BOUNDCHECK(ZSTD_c_searchLog, (int)cParams.searchLog);
1169 BOUNDCHECK(ZSTD_c_minMatch, (int)cParams.minMatch);
1170 BOUNDCHECK(ZSTD_c_targetLength,(int)cParams.targetLength);
1171 BOUNDCHECK(ZSTD_c_strategy, cParams.strategy);
1172 return 0;
1173 }
1174
1175 /* ZSTD_clampCParams() :
1176 * make CParam values within valid range.
1177 * @return : valid CParams */
1178 static ZSTD_compressionParameters
1179 ZSTD_clampCParams(ZSTD_compressionParameters cParams)
1180 {
1181 # define CLAMP_TYPE(cParam, val, type) { \
1182 ZSTD_bounds const bounds = ZSTD_cParam_getBounds(cParam); \
1183 if ((int)val<bounds.lowerBound) val=(type)bounds.lowerBound; \
1184 else if ((int)val>bounds.upperBound) val=(type)bounds.upperBound; \
1185 }
1186 # define CLAMP(cParam, val) CLAMP_TYPE(cParam, val, unsigned)
1187 CLAMP(ZSTD_c_windowLog, cParams.windowLog);
1188 CLAMP(ZSTD_c_chainLog, cParams.chainLog);
1189 CLAMP(ZSTD_c_hashLog, cParams.hashLog);
1190 CLAMP(ZSTD_c_searchLog, cParams.searchLog);
1191 CLAMP(ZSTD_c_minMatch, cParams.minMatch);
1192 CLAMP(ZSTD_c_targetLength,cParams.targetLength);
1193 CLAMP_TYPE(ZSTD_c_strategy,cParams.strategy, ZSTD_strategy);
1194 return cParams;
1195 }
1196
1197 /* ZSTD_cycleLog() :
1198 * condition for correct operation : hashLog > 1 */
1199 U32 ZSTD_cycleLog(U32 hashLog, ZSTD_strategy strat)
1200 {
1201 U32 const btScale = ((U32)strat >= (U32)ZSTD_btlazy2);
1202 return hashLog - btScale;
1203 }
1204
1205 /* ZSTD_dictAndWindowLog() :
1206 * Returns an adjusted window log that is large enough to fit the source and the dictionary.
1207 * The zstd format says that the entire dictionary is valid if one byte of the dictionary
1208 * is within the window. So the hashLog and chainLog should be large enough to reference both
1209 * the dictionary and the window. So we must use this adjusted dictAndWindowLog when downsizing
1210 * the hashLog and windowLog.
1211 * NOTE: srcSize must not be ZSTD_CONTENTSIZE_UNKNOWN.
1212 */
1213 static U32 ZSTD_dictAndWindowLog(U32 windowLog, U64 srcSize, U64 dictSize)
1214 {
1215 const U64 maxWindowSize = 1ULL << ZSTD_WINDOWLOG_MAX;
1216 /* No dictionary ==> No change */
1217 if (dictSize == 0) {
1218 return windowLog;
1219 }
1220 assert(windowLog <= ZSTD_WINDOWLOG_MAX);
1221 assert(srcSize != ZSTD_CONTENTSIZE_UNKNOWN); /* Handled in ZSTD_adjustCParams_internal() */
1222 {
1223 U64 const windowSize = 1ULL << windowLog;
1224 U64 const dictAndWindowSize = dictSize + windowSize;
1225 /* If the window size is already large enough to fit both the source and the dictionary
1226 * then just use the window size. Otherwise adjust so that it fits the dictionary and
1227 * the window.
1228 */
1229 if (windowSize >= dictSize + srcSize) {
1230 return windowLog; /* Window size large enough already */
1231 } else if (dictAndWindowSize >= maxWindowSize) {
1232 return ZSTD_WINDOWLOG_MAX; /* Larger than max window log */
1233 } else {
1234 return ZSTD_highbit32((U32)dictAndWindowSize - 1) + 1;
1235 }
1236 }
1237 }
1238
1239 /* ZSTD_adjustCParams_internal() :
1240 * optimize `cPar` for a specified input (`srcSize` and `dictSize`).
1241 * mostly downsize to reduce memory consumption and initialization latency.
1242 * `srcSize` can be ZSTD_CONTENTSIZE_UNKNOWN when not known.
1243 * `mode` is the mode for parameter adjustment. See docs for `ZSTD_cParamMode_e`.
1244 * note : `srcSize==0` means 0!
1245 * condition : cPar is presumed validated (can be checked using ZSTD_checkCParams()). */
1246 static ZSTD_compressionParameters
1247 ZSTD_adjustCParams_internal(ZSTD_compressionParameters cPar,
1248 unsigned long long srcSize,
1249 size_t dictSize,
1250 ZSTD_cParamMode_e mode)
1251 {
1252 const U64 minSrcSize = 513; /* (1<<9) + 1 */
1253 const U64 maxWindowResize = 1ULL << (ZSTD_WINDOWLOG_MAX-1);
1254 assert(ZSTD_checkCParams(cPar)==0);
1255
1256 switch (mode) {
1257 case ZSTD_cpm_unknown:
1258 case ZSTD_cpm_noAttachDict:
1259 /* If we don't know the source size, don't make any
1260 * assumptions about it. We will already have selected
1261 * smaller parameters if a dictionary is in use.
1262 */
1263 break;
1264 case ZSTD_cpm_createCDict:
1265 /* Assume a small source size when creating a dictionary
1266 * with an unknown source size.
1267 */
1268 if (dictSize && srcSize == ZSTD_CONTENTSIZE_UNKNOWN)
1269 srcSize = minSrcSize;
1270 break;
1271 case ZSTD_cpm_attachDict:
1272 /* Dictionary has its own dedicated parameters which have
1273 * already been selected. We are selecting parameters
1274 * for only the source.
1275 */
1276 dictSize = 0;
1277 break;
1278 default:
1279 assert(0);
1280 break;
1281 }
1282
1283 /* resize windowLog if input is small enough, to use less memory */
1284 if ( (srcSize < maxWindowResize)
1285 && (dictSize < maxWindowResize) ) {
1286 U32 const tSize = (U32)(srcSize + dictSize);
1287 static U32 const hashSizeMin = 1 << ZSTD_HASHLOG_MIN;
1288 U32 const srcLog = (tSize < hashSizeMin) ? ZSTD_HASHLOG_MIN :
1289 ZSTD_highbit32(tSize-1) + 1;
1290 if (cPar.windowLog > srcLog) cPar.windowLog = srcLog;
1291 }
1292 if (srcSize != ZSTD_CONTENTSIZE_UNKNOWN) {
1293 U32 const dictAndWindowLog = ZSTD_dictAndWindowLog(cPar.windowLog, (U64)srcSize, (U64)dictSize);
1294 U32 const cycleLog = ZSTD_cycleLog(cPar.chainLog, cPar.strategy);
1295 if (cPar.hashLog > dictAndWindowLog+1) cPar.hashLog = dictAndWindowLog+1;
1296 if (cycleLog > dictAndWindowLog)
1297 cPar.chainLog -= (cycleLog - dictAndWindowLog);
1298 }
1299
1300 if (cPar.windowLog < ZSTD_WINDOWLOG_ABSOLUTEMIN)
1301 cPar.windowLog = ZSTD_WINDOWLOG_ABSOLUTEMIN; /* minimum wlog required for valid frame header */
1302
1303 return cPar;
1304 }
1305
1306 ZSTD_compressionParameters
1307 ZSTD_adjustCParams(ZSTD_compressionParameters cPar,
1308 unsigned long long srcSize,
1309 size_t dictSize)
1310 {
1311 cPar = ZSTD_clampCParams(cPar); /* resulting cPar is necessarily valid (all parameters within range) */
1312 if (srcSize == 0) srcSize = ZSTD_CONTENTSIZE_UNKNOWN;
1313 return ZSTD_adjustCParams_internal(cPar, srcSize, dictSize, ZSTD_cpm_unknown);
1314 }
1315
1316 static ZSTD_compressionParameters ZSTD_getCParams_internal(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode);
1317 static ZSTD_parameters ZSTD_getParams_internal(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode);
1318
1319 static void ZSTD_overrideCParams(
1320 ZSTD_compressionParameters* cParams,
1321 const ZSTD_compressionParameters* overrides)
1322 {
1323 if (overrides->windowLog) cParams->windowLog = overrides->windowLog;
1324 if (overrides->hashLog) cParams->hashLog = overrides->hashLog;
1325 if (overrides->chainLog) cParams->chainLog = overrides->chainLog;
1326 if (overrides->searchLog) cParams->searchLog = overrides->searchLog;
1327 if (overrides->minMatch) cParams->minMatch = overrides->minMatch;
1328 if (overrides->targetLength) cParams->targetLength = overrides->targetLength;
1329 if (overrides->strategy) cParams->strategy = overrides->strategy;
1330 }
1331
1332 ZSTD_compressionParameters ZSTD_getCParamsFromCCtxParams(
1333 const ZSTD_CCtx_params* CCtxParams, U64 srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode)
1334 {
1335 ZSTD_compressionParameters cParams;
1336 if (srcSizeHint == ZSTD_CONTENTSIZE_UNKNOWN && CCtxParams->srcSizeHint > 0) {
1337 srcSizeHint = CCtxParams->srcSizeHint;
1338 }
1339 cParams = ZSTD_getCParams_internal(CCtxParams->compressionLevel, srcSizeHint, dictSize, mode);
1340 if (CCtxParams->ldmParams.enableLdm == ZSTD_ps_enable) cParams.windowLog = ZSTD_LDM_DEFAULT_WINDOW_LOG;
1341 ZSTD_overrideCParams(&cParams, &CCtxParams->cParams);
1342 assert(!ZSTD_checkCParams(cParams));
1343 /* srcSizeHint == 0 means 0 */
1344 return ZSTD_adjustCParams_internal(cParams, srcSizeHint, dictSize, mode);
1345 }
1346
1347 static size_t
1348 ZSTD_sizeof_matchState(const ZSTD_compressionParameters* const cParams,
1349 const ZSTD_paramSwitch_e useRowMatchFinder,
1350 const U32 enableDedicatedDictSearch,
1351 const U32 forCCtx)
1352 {
1353 /* chain table size should be 0 for fast or row-hash strategies */
1354 size_t const chainSize = ZSTD_allocateChainTable(cParams->strategy, useRowMatchFinder, enableDedicatedDictSearch && !forCCtx)
1355 ? ((size_t)1 << cParams->chainLog)
1356 : 0;
1357 size_t const hSize = ((size_t)1) << cParams->hashLog;
1358 U32 const hashLog3 = (forCCtx && cParams->minMatch==3) ? MIN(ZSTD_HASHLOG3_MAX, cParams->windowLog) : 0;
1359 size_t const h3Size = hashLog3 ? ((size_t)1) << hashLog3 : 0;
1360 /* We don't use ZSTD_cwksp_alloc_size() here because the tables aren't
1361 * surrounded by redzones in ASAN. */
1362 size_t const tableSpace = chainSize * sizeof(U32)
1363 + hSize * sizeof(U32)
1364 + h3Size * sizeof(U32);
1365 size_t const optPotentialSpace =
1366 ZSTD_cwksp_aligned_alloc_size((MaxML+1) * sizeof(U32))
1367 + ZSTD_cwksp_aligned_alloc_size((MaxLL+1) * sizeof(U32))
1368 + ZSTD_cwksp_aligned_alloc_size((MaxOff+1) * sizeof(U32))
1369 + ZSTD_cwksp_aligned_alloc_size((1<<Litbits) * sizeof(U32))
1370 + ZSTD_cwksp_aligned_alloc_size((ZSTD_OPT_NUM+1) * sizeof(ZSTD_match_t))
1371 + ZSTD_cwksp_aligned_alloc_size((ZSTD_OPT_NUM+1) * sizeof(ZSTD_optimal_t));
1372 size_t const lazyAdditionalSpace = ZSTD_rowMatchFinderUsed(cParams->strategy, useRowMatchFinder)
1373 ? ZSTD_cwksp_aligned_alloc_size(hSize*sizeof(U16))
1374 : 0;
1375 size_t const optSpace = (forCCtx && (cParams->strategy >= ZSTD_btopt))
1376 ? optPotentialSpace
1377 : 0;
1378 size_t const slackSpace = ZSTD_cwksp_slack_space_required();
1379
1380 /* tables are guaranteed to be sized in multiples of 64 bytes (or 16 uint32_t) */
1381 ZSTD_STATIC_ASSERT(ZSTD_HASHLOG_MIN >= 4 && ZSTD_WINDOWLOG_MIN >= 4 && ZSTD_CHAINLOG_MIN >= 4);
1382 assert(useRowMatchFinder != ZSTD_ps_auto);
1383
1384 DEBUGLOG(4, "chainSize: %u - hSize: %u - h3Size: %u",
1385 (U32)chainSize, (U32)hSize, (U32)h3Size);
1386 return tableSpace + optSpace + slackSpace + lazyAdditionalSpace;
1387 }
1388
1389 static size_t ZSTD_estimateCCtxSize_usingCCtxParams_internal(
1390 const ZSTD_compressionParameters* cParams,
1391 const ldmParams_t* ldmParams,
1392 const int isStatic,
1393 const ZSTD_paramSwitch_e useRowMatchFinder,
1394 const size_t buffInSize,
1395 const size_t buffOutSize,
1396 const U64 pledgedSrcSize)
1397 {
1398 size_t const windowSize = (size_t) BOUNDED(1ULL, 1ULL << cParams->windowLog, pledgedSrcSize);
1399 size_t const blockSize = MIN(ZSTD_BLOCKSIZE_MAX, windowSize);
1400 U32 const divider = (cParams->minMatch==3) ? 3 : 4;
1401 size_t const maxNbSeq = blockSize / divider;
1402 size_t const tokenSpace = ZSTD_cwksp_alloc_size(WILDCOPY_OVERLENGTH + blockSize)
1403 + ZSTD_cwksp_aligned_alloc_size(maxNbSeq * sizeof(seqDef))
1404 + 3 * ZSTD_cwksp_alloc_size(maxNbSeq * sizeof(BYTE));
1405 size_t const entropySpace = ZSTD_cwksp_alloc_size(ENTROPY_WORKSPACE_SIZE);
1406 size_t const blockStateSpace = 2 * ZSTD_cwksp_alloc_size(sizeof(ZSTD_compressedBlockState_t));
1407 size_t const matchStateSize = ZSTD_sizeof_matchState(cParams, useRowMatchFinder, /* enableDedicatedDictSearch */ 0, /* forCCtx */ 1);
1408
1409 size_t const ldmSpace = ZSTD_ldm_getTableSize(*ldmParams);
1410 size_t const maxNbLdmSeq = ZSTD_ldm_getMaxNbSeq(*ldmParams, blockSize);
1411 size_t const ldmSeqSpace = ldmParams->enableLdm == ZSTD_ps_enable ?
1412 ZSTD_cwksp_aligned_alloc_size(maxNbLdmSeq * sizeof(rawSeq)) : 0;
1413
1414
1415 size_t const bufferSpace = ZSTD_cwksp_alloc_size(buffInSize)
1416 + ZSTD_cwksp_alloc_size(buffOutSize);
1417
1418 size_t const cctxSpace = isStatic ? ZSTD_cwksp_alloc_size(sizeof(ZSTD_CCtx)) : 0;
1419
1420 size_t const neededSpace =
1421 cctxSpace +
1422 entropySpace +
1423 blockStateSpace +
1424 ldmSpace +
1425 ldmSeqSpace +
1426 matchStateSize +
1427 tokenSpace +
1428 bufferSpace;
1429
1430 DEBUGLOG(5, "estimate workspace : %u", (U32)neededSpace);
1431 return neededSpace;
1432 }
1433
1434 size_t ZSTD_estimateCCtxSize_usingCCtxParams(const ZSTD_CCtx_params* params)
1435 {
1436 ZSTD_compressionParameters const cParams =
1437 ZSTD_getCParamsFromCCtxParams(params, ZSTD_CONTENTSIZE_UNKNOWN, 0, ZSTD_cpm_noAttachDict);
1438 ZSTD_paramSwitch_e const useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(params->useRowMatchFinder,
1439 &cParams);
1440
1441 RETURN_ERROR_IF(params->nbWorkers > 0, GENERIC, "Estimate CCtx size is supported for single-threaded compression only.");
1442 /* estimateCCtxSize is for one-shot compression. So no buffers should
1443 * be needed. However, we still allocate two 0-sized buffers, which can
1444 * take space under ASAN. */
1445 return ZSTD_estimateCCtxSize_usingCCtxParams_internal(
1446 &cParams, ¶ms->ldmParams, 1, useRowMatchFinder, 0, 0, ZSTD_CONTENTSIZE_UNKNOWN);
1447 }
1448
1449 size_t ZSTD_estimateCCtxSize_usingCParams(ZSTD_compressionParameters cParams)
1450 {
1451 ZSTD_CCtx_params initialParams = ZSTD_makeCCtxParamsFromCParams(cParams);
1452 if (ZSTD_rowMatchFinderSupported(cParams.strategy)) {
1453 /* Pick bigger of not using and using row-based matchfinder for greedy and lazy strategies */
1454 size_t noRowCCtxSize;
1455 size_t rowCCtxSize;
1456 initialParams.useRowMatchFinder = ZSTD_ps_disable;
1457 noRowCCtxSize = ZSTD_estimateCCtxSize_usingCCtxParams(&initialParams);
1458 initialParams.useRowMatchFinder = ZSTD_ps_enable;
1459 rowCCtxSize = ZSTD_estimateCCtxSize_usingCCtxParams(&initialParams);
1460 return MAX(noRowCCtxSize, rowCCtxSize);
1461 } else {
1462 return ZSTD_estimateCCtxSize_usingCCtxParams(&initialParams);
1463 }
1464 }
1465
1466 static size_t ZSTD_estimateCCtxSize_internal(int compressionLevel)
1467 {
1468 int tier = 0;
1469 size_t largestSize = 0;
1470 static const unsigned long long srcSizeTiers[4] = {16 KB, 128 KB, 256 KB, ZSTD_CONTENTSIZE_UNKNOWN};
1471 for (; tier < 4; ++tier) {
1472 /* Choose the set of cParams for a given level across all srcSizes that give the largest cctxSize */
1473 ZSTD_compressionParameters const cParams = ZSTD_getCParams_internal(compressionLevel, srcSizeTiers[tier], 0, ZSTD_cpm_noAttachDict);
1474 largestSize = MAX(ZSTD_estimateCCtxSize_usingCParams(cParams), largestSize);
1475 }
1476 return largestSize;
1477 }
1478
1479 size_t ZSTD_estimateCCtxSize(int compressionLevel)
1480 {
1481 int level;
1482 size_t memBudget = 0;
1483 for (level=MIN(compressionLevel, 1); level<=compressionLevel; level++) {
1484 /* Ensure monotonically increasing memory usage as compression level increases */
1485 size_t const newMB = ZSTD_estimateCCtxSize_internal(level);
1486 if (newMB > memBudget) memBudget = newMB;
1487 }
1488 return memBudget;
1489 }
1490
1491 size_t ZSTD_estimateCStreamSize_usingCCtxParams(const ZSTD_CCtx_params* params)
1492 {
1493 RETURN_ERROR_IF(params->nbWorkers > 0, GENERIC, "Estimate CCtx size is supported for single-threaded compression only.");
1494 { ZSTD_compressionParameters const cParams =
1495 ZSTD_getCParamsFromCCtxParams(params, ZSTD_CONTENTSIZE_UNKNOWN, 0, ZSTD_cpm_noAttachDict);
1496 size_t const blockSize = MIN(ZSTD_BLOCKSIZE_MAX, (size_t)1 << cParams.windowLog);
1497 size_t const inBuffSize = (params->inBufferMode == ZSTD_bm_buffered)
1498 ? ((size_t)1 << cParams.windowLog) + blockSize
1499 : 0;
1500 size_t const outBuffSize = (params->outBufferMode == ZSTD_bm_buffered)
1501 ? ZSTD_compressBound(blockSize) + 1
1502 : 0;
1503 ZSTD_paramSwitch_e const useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(params->useRowMatchFinder, ¶ms->cParams);
1504
1505 return ZSTD_estimateCCtxSize_usingCCtxParams_internal(
1506 &cParams, ¶ms->ldmParams, 1, useRowMatchFinder, inBuffSize, outBuffSize,
1507 ZSTD_CONTENTSIZE_UNKNOWN);
1508 }
1509 }
1510
1511 size_t ZSTD_estimateCStreamSize_usingCParams(ZSTD_compressionParameters cParams)
1512 {
1513 ZSTD_CCtx_params initialParams = ZSTD_makeCCtxParamsFromCParams(cParams);
1514 if (ZSTD_rowMatchFinderSupported(cParams.strategy)) {
1515 /* Pick bigger of not using and using row-based matchfinder for greedy and lazy strategies */
1516 size_t noRowCCtxSize;
1517 size_t rowCCtxSize;
1518 initialParams.useRowMatchFinder = ZSTD_ps_disable;
1519 noRowCCtxSize = ZSTD_estimateCStreamSize_usingCCtxParams(&initialParams);
1520 initialParams.useRowMatchFinder = ZSTD_ps_enable;
1521 rowCCtxSize = ZSTD_estimateCStreamSize_usingCCtxParams(&initialParams);
1522 return MAX(noRowCCtxSize, rowCCtxSize);
1523 } else {
1524 return ZSTD_estimateCStreamSize_usingCCtxParams(&initialParams);
1525 }
1526 }
1527
1528 static size_t ZSTD_estimateCStreamSize_internal(int compressionLevel)
1529 {
1530 ZSTD_compressionParameters const cParams = ZSTD_getCParams_internal(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, 0, ZSTD_cpm_noAttachDict);
1531 return ZSTD_estimateCStreamSize_usingCParams(cParams);
1532 }
1533
1534 size_t ZSTD_estimateCStreamSize(int compressionLevel)
1535 {
1536 int level;
1537 size_t memBudget = 0;
1538 for (level=MIN(compressionLevel, 1); level<=compressionLevel; level++) {
1539 size_t const newMB = ZSTD_estimateCStreamSize_internal(level);
1540 if (newMB > memBudget) memBudget = newMB;
1541 }
1542 return memBudget;
1543 }
1544
1545 /* ZSTD_getFrameProgression():
1546 * tells how much data has been consumed (input) and produced (output) for current frame.
1547 * able to count progression inside worker threads (non-blocking mode).
1548 */
1549 ZSTD_frameProgression ZSTD_getFrameProgression(const ZSTD_CCtx* cctx)
1550 {
1551 { ZSTD_frameProgression fp;
1552 size_t const buffered = (cctx->inBuff == NULL) ? 0 :
1553 cctx->inBuffPos - cctx->inToCompress;
1554 if (buffered) assert(cctx->inBuffPos >= cctx->inToCompress);
1555 assert(buffered <= ZSTD_BLOCKSIZE_MAX);
1556 fp.ingested = cctx->consumedSrcSize + buffered;
1557 fp.consumed = cctx->consumedSrcSize;
1558 fp.produced = cctx->producedCSize;
1559 fp.flushed = cctx->producedCSize; /* simplified; some data might still be left within streaming output buffer */
1560 fp.currentJobID = 0;
1561 fp.nbActiveWorkers = 0;
1562 return fp;
1563 } }
1564
1565 /*! ZSTD_toFlushNow()
1566 * Only useful for multithreading scenarios currently (nbWorkers >= 1).
1567 */
1568 size_t ZSTD_toFlushNow(ZSTD_CCtx* cctx)
1569 {
1570 (void)cctx;
1571 return 0; /* over-simplification; could also check if context is currently running in streaming mode, and in which case, report how many bytes are left to be flushed within output buffer */
1572 }
1573
1574 static void ZSTD_assertEqualCParams(ZSTD_compressionParameters cParams1,
1575 ZSTD_compressionParameters cParams2)
1576 {
1577 (void)cParams1;
1578 (void)cParams2;
1579 assert(cParams1.windowLog == cParams2.windowLog);
1580 assert(cParams1.chainLog == cParams2.chainLog);
1581 assert(cParams1.hashLog == cParams2.hashLog);
1582 assert(cParams1.searchLog == cParams2.searchLog);
1583 assert(cParams1.minMatch == cParams2.minMatch);
1584 assert(cParams1.targetLength == cParams2.targetLength);
1585 assert(cParams1.strategy == cParams2.strategy);
1586 }
1587
1588 void ZSTD_reset_compressedBlockState(ZSTD_compressedBlockState_t* bs)
1589 {
1590 int i;
1591 for (i = 0; i < ZSTD_REP_NUM; ++i)
1592 bs->rep[i] = repStartValue[i];
1593 bs->entropy.huf.repeatMode = HUF_repeat_none;
1594 bs->entropy.fse.offcode_repeatMode = FSE_repeat_none;
1595 bs->entropy.fse.matchlength_repeatMode = FSE_repeat_none;
1596 bs->entropy.fse.litlength_repeatMode = FSE_repeat_none;
1597 }
1598
1599 /*! ZSTD_invalidateMatchState()
1600 * Invalidate all the matches in the match finder tables.
1601 * Requires nextSrc and base to be set (can be NULL).
1602 */
1603 static void ZSTD_invalidateMatchState(ZSTD_matchState_t* ms)
1604 {
1605 ZSTD_window_clear(&ms->window);
1606
1607 ms->nextToUpdate = ms->window.dictLimit;
1608 ms->loadedDictEnd = 0;
1609 ms->opt.litLengthSum = 0; /* force reset of btopt stats */
1610 ms->dictMatchState = NULL;
1611 }
1612
1613 /*
1614 * Controls, for this matchState reset, whether the tables need to be cleared /
1615 * prepared for the coming compression (ZSTDcrp_makeClean), or whether the
1616 * tables can be left unclean (ZSTDcrp_leaveDirty), because we know that a
1617 * subsequent operation will overwrite the table space anyways (e.g., copying
1618 * the matchState contents in from a CDict).
1619 */
1620 typedef enum {
1621 ZSTDcrp_makeClean,
1622 ZSTDcrp_leaveDirty
1623 } ZSTD_compResetPolicy_e;
1624
1625 /*
1626 * Controls, for this matchState reset, whether indexing can continue where it
1627 * left off (ZSTDirp_continue), or whether it needs to be restarted from zero
1628 * (ZSTDirp_reset).
1629 */
1630 typedef enum {
1631 ZSTDirp_continue,
1632 ZSTDirp_reset
1633 } ZSTD_indexResetPolicy_e;
1634
1635 typedef enum {
1636 ZSTD_resetTarget_CDict,
1637 ZSTD_resetTarget_CCtx
1638 } ZSTD_resetTarget_e;
1639
1640
1641 static size_t
1642 ZSTD_reset_matchState(ZSTD_matchState_t* ms,
1643 ZSTD_cwksp* ws,
1644 const ZSTD_compressionParameters* cParams,
1645 const ZSTD_paramSwitch_e useRowMatchFinder,
1646 const ZSTD_compResetPolicy_e crp,
1647 const ZSTD_indexResetPolicy_e forceResetIndex,
1648 const ZSTD_resetTarget_e forWho)
1649 {
1650 /* disable chain table allocation for fast or row-based strategies */
1651 size_t const chainSize = ZSTD_allocateChainTable(cParams->strategy, useRowMatchFinder,
1652 ms->dedicatedDictSearch && (forWho == ZSTD_resetTarget_CDict))
1653 ? ((size_t)1 << cParams->chainLog)
1654 : 0;
1655 size_t const hSize = ((size_t)1) << cParams->hashLog;
1656 U32 const hashLog3 = ((forWho == ZSTD_resetTarget_CCtx) && cParams->minMatch==3) ? MIN(ZSTD_HASHLOG3_MAX, cParams->windowLog) : 0;
1657 size_t const h3Size = hashLog3 ? ((size_t)1) << hashLog3 : 0;
1658
1659 DEBUGLOG(4, "reset indices : %u", forceResetIndex == ZSTDirp_reset);
1660 assert(useRowMatchFinder != ZSTD_ps_auto);
1661 if (forceResetIndex == ZSTDirp_reset) {
1662 ZSTD_window_init(&ms->window);
1663 ZSTD_cwksp_mark_tables_dirty(ws);
1664 }
1665
1666 ms->hashLog3 = hashLog3;
1667
1668 ZSTD_invalidateMatchState(ms);
1669
1670 assert(!ZSTD_cwksp_reserve_failed(ws)); /* check that allocation hasn't already failed */
1671
1672 ZSTD_cwksp_clear_tables(ws);
1673
1674 DEBUGLOG(5, "reserving table space");
1675 /* table Space */
1676 ms->hashTable = (U32*)ZSTD_cwksp_reserve_table(ws, hSize * sizeof(U32));
1677 ms->chainTable = (U32*)ZSTD_cwksp_reserve_table(ws, chainSize * sizeof(U32));
1678 ms->hashTable3 = (U32*)ZSTD_cwksp_reserve_table(ws, h3Size * sizeof(U32));
1679 RETURN_ERROR_IF(ZSTD_cwksp_reserve_failed(ws), memory_allocation,
1680 "failed a workspace allocation in ZSTD_reset_matchState");
1681
1682 DEBUGLOG(4, "reset table : %u", crp!=ZSTDcrp_leaveDirty);
1683 if (crp!=ZSTDcrp_leaveDirty) {
1684 /* reset tables only */
1685 ZSTD_cwksp_clean_tables(ws);
1686 }
1687
1688 /* opt parser space */
1689 if ((forWho == ZSTD_resetTarget_CCtx) && (cParams->strategy >= ZSTD_btopt)) {
1690 DEBUGLOG(4, "reserving optimal parser space");
1691 ms->opt.litFreq = (unsigned*)ZSTD_cwksp_reserve_aligned(ws, (1<<Litbits) * sizeof(unsigned));
1692 ms->opt.litLengthFreq = (unsigned*)ZSTD_cwksp_reserve_aligned(ws, (MaxLL+1) * sizeof(unsigned));
1693 ms->opt.matchLengthFreq = (unsigned*)ZSTD_cwksp_reserve_aligned(ws, (MaxML+1) * sizeof(unsigned));
1694 ms->opt.offCodeFreq = (unsigned*)ZSTD_cwksp_reserve_aligned(ws, (MaxOff+1) * sizeof(unsigned));
1695 ms->opt.matchTable = (ZSTD_match_t*)ZSTD_cwksp_reserve_aligned(ws, (ZSTD_OPT_NUM+1) * sizeof(ZSTD_match_t));
1696 ms->opt.priceTable = (ZSTD_optimal_t*)ZSTD_cwksp_reserve_aligned(ws, (ZSTD_OPT_NUM+1) * sizeof(ZSTD_optimal_t));
1697 }
1698
1699 if (ZSTD_rowMatchFinderUsed(cParams->strategy, useRowMatchFinder)) {
1700 { /* Row match finder needs an additional table of hashes ("tags") */
1701 size_t const tagTableSize = hSize*sizeof(U16);
1702 ms->tagTable = (U16*)ZSTD_cwksp_reserve_aligned(ws, tagTableSize);
1703 if (ms->tagTable) ZSTD_memset(ms->tagTable, 0, tagTableSize);
1704 }
1705 { /* Switch to 32-entry rows if searchLog is 5 (or more) */
1706 U32 const rowLog = BOUNDED(4, cParams->searchLog, 6);
1707 assert(cParams->hashLog >= rowLog);
1708 ms->rowHashLog = cParams->hashLog - rowLog;
1709 }
1710 }
1711
1712 ms->cParams = *cParams;
1713
1714 RETURN_ERROR_IF(ZSTD_cwksp_reserve_failed(ws), memory_allocation,
1715 "failed a workspace allocation in ZSTD_reset_matchState");
1716 return 0;
1717 }
1718
1719 /* ZSTD_indexTooCloseToMax() :
1720 * minor optimization : prefer memset() rather than reduceIndex()
1721 * which is measurably slow in some circumstances (reported for Visual Studio).
1722 * Works when re-using a context for a lot of smallish inputs :
1723 * if all inputs are smaller than ZSTD_INDEXOVERFLOW_MARGIN,
1724 * memset() will be triggered before reduceIndex().
1725 */
1726 #define ZSTD_INDEXOVERFLOW_MARGIN (16 MB)
1727 static int ZSTD_indexTooCloseToMax(ZSTD_window_t w)
1728 {
1729 return (size_t)(w.nextSrc - w.base) > (ZSTD_CURRENT_MAX - ZSTD_INDEXOVERFLOW_MARGIN);
1730 }
1731
1732 /* ZSTD_dictTooBig():
1733 * When dictionaries are larger than ZSTD_CHUNKSIZE_MAX they can't be loaded in
1734 * one go generically. So we ensure that in that case we reset the tables to zero,
1735 * so that we can load as much of the dictionary as possible.
1736 */
1737 static int ZSTD_dictTooBig(size_t const loadedDictSize)
1738 {
1739 return loadedDictSize > ZSTD_CHUNKSIZE_MAX;
1740 }
1741
1742 /*! ZSTD_resetCCtx_internal() :
1743 * @param loadedDictSize The size of the dictionary to be loaded
1744 * into the context, if any. If no dictionary is used, or the
1745 * dictionary is being attached / copied, then pass 0.
1746 * note : `params` are assumed fully validated at this stage.
1747 */
1748 static size_t ZSTD_resetCCtx_internal(ZSTD_CCtx* zc,
1749 ZSTD_CCtx_params const* params,
1750 U64 const pledgedSrcSize,
1751 size_t const loadedDictSize,
1752 ZSTD_compResetPolicy_e const crp,
1753 ZSTD_buffered_policy_e const zbuff)
1754 {
1755 ZSTD_cwksp* const ws = &zc->workspace;
1756 DEBUGLOG(4, "ZSTD_resetCCtx_internal: pledgedSrcSize=%u, wlog=%u, useRowMatchFinder=%d useBlockSplitter=%d",
1757 (U32)pledgedSrcSize, params->cParams.windowLog, (int)params->useRowMatchFinder, (int)params->useBlockSplitter);
1758 assert(!ZSTD_isError(ZSTD_checkCParams(params->cParams)));
1759
1760 zc->isFirstBlock = 1;
1761
1762 /* Set applied params early so we can modify them for LDM,
1763 * and point params at the applied params.
1764 */
1765 zc->appliedParams = *params;
1766 params = &zc->appliedParams;
1767
1768 assert(params->useRowMatchFinder != ZSTD_ps_auto);
1769 assert(params->useBlockSplitter != ZSTD_ps_auto);
1770 assert(params->ldmParams.enableLdm != ZSTD_ps_auto);
1771 if (params->ldmParams.enableLdm == ZSTD_ps_enable) {
1772 /* Adjust long distance matching parameters */
1773 ZSTD_ldm_adjustParameters(&zc->appliedParams.ldmParams, ¶ms->cParams);
1774 assert(params->ldmParams.hashLog >= params->ldmParams.bucketSizeLog);
1775 assert(params->ldmParams.hashRateLog < 32);
1776 }
1777
1778 { size_t const windowSize = MAX(1, (size_t)MIN(((U64)1 << params->cParams.windowLog), pledgedSrcSize));
1779 size_t const blockSize = MIN(ZSTD_BLOCKSIZE_MAX, windowSize);
1780 U32 const divider = (params->cParams.minMatch==3) ? 3 : 4;
1781 size_t const maxNbSeq = blockSize / divider;
1782 size_t const buffOutSize = (zbuff == ZSTDb_buffered && params->outBufferMode == ZSTD_bm_buffered)
1783 ? ZSTD_compressBound(blockSize) + 1
1784 : 0;
1785 size_t const buffInSize = (zbuff == ZSTDb_buffered && params->inBufferMode == ZSTD_bm_buffered)
1786 ? windowSize + blockSize
1787 : 0;
1788 size_t const maxNbLdmSeq = ZSTD_ldm_getMaxNbSeq(params->ldmParams, blockSize);
1789
1790 int const indexTooClose = ZSTD_indexTooCloseToMax(zc->blockState.matchState.window);
1791 int const dictTooBig = ZSTD_dictTooBig(loadedDictSize);
1792 ZSTD_indexResetPolicy_e needsIndexReset =
1793 (indexTooClose || dictTooBig || !zc->initialized) ? ZSTDirp_reset : ZSTDirp_continue;
1794
1795 size_t const neededSpace =
1796 ZSTD_estimateCCtxSize_usingCCtxParams_internal(
1797 ¶ms->cParams, ¶ms->ldmParams, zc->staticSize != 0, params->useRowMatchFinder,
1798 buffInSize, buffOutSize, pledgedSrcSize);
1799 int resizeWorkspace;
1800
1801 FORWARD_IF_ERROR(neededSpace, "cctx size estimate failed!");
1802
1803 if (!zc->staticSize) ZSTD_cwksp_bump_oversized_duration(ws, 0);
1804
1805 { /* Check if workspace is large enough, alloc a new one if needed */
1806 int const workspaceTooSmall = ZSTD_cwksp_sizeof(ws) < neededSpace;
1807 int const workspaceWasteful = ZSTD_cwksp_check_wasteful(ws, neededSpace);
1808 resizeWorkspace = workspaceTooSmall || workspaceWasteful;
1809 DEBUGLOG(4, "Need %zu B workspace", neededSpace);
1810 DEBUGLOG(4, "windowSize: %zu - blockSize: %zu", windowSize, blockSize);
1811
1812 if (resizeWorkspace) {
1813 DEBUGLOG(4, "Resize workspaceSize from %zuKB to %zuKB",
1814 ZSTD_cwksp_sizeof(ws) >> 10,
1815 neededSpace >> 10);
1816
1817 RETURN_ERROR_IF(zc->staticSize, memory_allocation, "static cctx : no resize");
1818
1819 needsIndexReset = ZSTDirp_reset;
1820
1821 ZSTD_cwksp_free(ws, zc->customMem);
1822 FORWARD_IF_ERROR(ZSTD_cwksp_create(ws, neededSpace, zc->customMem), "");
1823
1824 DEBUGLOG(5, "reserving object space");
1825 /* Statically sized space.
1826 * entropyWorkspace never moves,
1827 * though prev/next block swap places */
1828 assert(ZSTD_cwksp_check_available(ws, 2 * sizeof(ZSTD_compressedBlockState_t)));
1829 zc->blockState.prevCBlock = (ZSTD_compressedBlockState_t*) ZSTD_cwksp_reserve_object(ws, sizeof(ZSTD_compressedBlockState_t));
1830 RETURN_ERROR_IF(zc->blockState.prevCBlock == NULL, memory_allocation, "couldn't allocate prevCBlock");
1831 zc->blockState.nextCBlock = (ZSTD_compressedBlockState_t*) ZSTD_cwksp_reserve_object(ws, sizeof(ZSTD_compressedBlockState_t));
1832 RETURN_ERROR_IF(zc->blockState.nextCBlock == NULL, memory_allocation, "couldn't allocate nextCBlock");
1833 zc->entropyWorkspace = (U32*) ZSTD_cwksp_reserve_object(ws, ENTROPY_WORKSPACE_SIZE);
1834 RETURN_ERROR_IF(zc->entropyWorkspace == NULL, memory_allocation, "couldn't allocate entropyWorkspace");
1835 } }
1836
1837 ZSTD_cwksp_clear(ws);
1838
1839 /* init params */
1840 zc->blockState.matchState.cParams = params->cParams;
1841 zc->pledgedSrcSizePlusOne = pledgedSrcSize+1;
1842 zc->consumedSrcSize = 0;
1843 zc->producedCSize = 0;
1844 if (pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN)
1845 zc->appliedParams.fParams.contentSizeFlag = 0;
1846 DEBUGLOG(4, "pledged content size : %u ; flag : %u",
1847 (unsigned)pledgedSrcSize, zc->appliedParams.fParams.contentSizeFlag);
1848 zc->blockSize = blockSize;
1849
1850 xxh64_reset(&zc->xxhState, 0);
1851 zc->stage = ZSTDcs_init;
1852 zc->dictID = 0;
1853 zc->dictContentSize = 0;
1854
1855 ZSTD_reset_compressedBlockState(zc->blockState.prevCBlock);
1856
1857 /* ZSTD_wildcopy() is used to copy into the literals buffer,
1858 * so we have to oversize the buffer by WILDCOPY_OVERLENGTH bytes.
1859 */
1860 zc->seqStore.litStart = ZSTD_cwksp_reserve_buffer(ws, blockSize + WILDCOPY_OVERLENGTH);
1861 zc->seqStore.maxNbLit = blockSize;
1862
1863 /* buffers */
1864 zc->bufferedPolicy = zbuff;
1865 zc->inBuffSize = buffInSize;
1866 zc->inBuff = (char*)ZSTD_cwksp_reserve_buffer(ws, buffInSize);
1867 zc->outBuffSize = buffOutSize;
1868 zc->outBuff = (char*)ZSTD_cwksp_reserve_buffer(ws, buffOutSize);
1869
1870 /* ldm bucketOffsets table */
1871 if (params->ldmParams.enableLdm == ZSTD_ps_enable) {
1872 /* TODO: avoid memset? */
1873 size_t const numBuckets =
1874 ((size_t)1) << (params->ldmParams.hashLog -
1875 params->ldmParams.bucketSizeLog);
1876 zc->ldmState.bucketOffsets = ZSTD_cwksp_reserve_buffer(ws, numBuckets);
1877 ZSTD_memset(zc->ldmState.bucketOffsets, 0, numBuckets);
1878 }
1879
1880 /* sequences storage */
1881 ZSTD_referenceExternalSequences(zc, NULL, 0);
1882 zc->seqStore.maxNbSeq = maxNbSeq;
1883 zc->seqStore.llCode = ZSTD_cwksp_reserve_buffer(ws, maxNbSeq * sizeof(BYTE));
1884 zc->seqStore.mlCode = ZSTD_cwksp_reserve_buffer(ws, maxNbSeq * sizeof(BYTE));
1885 zc->seqStore.ofCode = ZSTD_cwksp_reserve_buffer(ws, maxNbSeq * sizeof(BYTE));
1886 zc->seqStore.sequencesStart = (seqDef*)ZSTD_cwksp_reserve_aligned(ws, maxNbSeq * sizeof(seqDef));
1887
1888 FORWARD_IF_ERROR(ZSTD_reset_matchState(
1889 &zc->blockState.matchState,
1890 ws,
1891 ¶ms->cParams,
1892 params->useRowMatchFinder,
1893 crp,
1894 needsIndexReset,
1895 ZSTD_resetTarget_CCtx), "");
1896
1897 /* ldm hash table */
1898 if (params->ldmParams.enableLdm == ZSTD_ps_enable) {
1899 /* TODO: avoid memset? */
1900 size_t const ldmHSize = ((size_t)1) << params->ldmParams.hashLog;
1901 zc->ldmState.hashTable = (ldmEntry_t*)ZSTD_cwksp_reserve_aligned(ws, ldmHSize * sizeof(ldmEntry_t));
1902 ZSTD_memset(zc->ldmState.hashTable, 0, ldmHSize * sizeof(ldmEntry_t));
1903 zc->ldmSequences = (rawSeq*)ZSTD_cwksp_reserve_aligned(ws, maxNbLdmSeq * sizeof(rawSeq));
1904 zc->maxNbLdmSequences = maxNbLdmSeq;
1905
1906 ZSTD_window_init(&zc->ldmState.window);
1907 zc->ldmState.loadedDictEnd = 0;
1908 }
1909
1910 DEBUGLOG(3, "wksp: finished allocating, %zd bytes remain available", ZSTD_cwksp_available_space(ws));
1911 assert(ZSTD_cwksp_estimated_space_within_bounds(ws, neededSpace, resizeWorkspace));
1912
1913 zc->initialized = 1;
1914
1915 return 0;
1916 }
1917 }
1918
1919 /* ZSTD_invalidateRepCodes() :
1920 * ensures next compression will not use repcodes from previous block.
1921 * Note : only works with regular variant;
1922 * do not use with extDict variant ! */
1923 void ZSTD_invalidateRepCodes(ZSTD_CCtx* cctx) {
1924 int i;
1925 for (i=0; i<ZSTD_REP_NUM; i++) cctx->blockState.prevCBlock->rep[i] = 0;
1926 assert(!ZSTD_window_hasExtDict(cctx->blockState.matchState.window));
1927 }
1928
1929 /* These are the approximate sizes for each strategy past which copying the
1930 * dictionary tables into the working context is faster than using them
1931 * in-place.
1932 */
1933 static const size_t attachDictSizeCutoffs[ZSTD_STRATEGY_MAX+1] = {
1934 8 KB, /* unused */
1935 8 KB, /* ZSTD_fast */
1936 16 KB, /* ZSTD_dfast */
1937 32 KB, /* ZSTD_greedy */
1938 32 KB, /* ZSTD_lazy */
1939 32 KB, /* ZSTD_lazy2 */
1940 32 KB, /* ZSTD_btlazy2 */
1941 32 KB, /* ZSTD_btopt */
1942 8 KB, /* ZSTD_btultra */
1943 8 KB /* ZSTD_btultra2 */
1944 };
1945
1946 static int ZSTD_shouldAttachDict(const ZSTD_CDict* cdict,
1947 const ZSTD_CCtx_params* params,
1948 U64 pledgedSrcSize)
1949 {
1950 size_t cutoff = attachDictSizeCutoffs[cdict->matchState.cParams.strategy];
1951 int const dedicatedDictSearch = cdict->matchState.dedicatedDictSearch;
1952 return dedicatedDictSearch
1953 || ( ( pledgedSrcSize <= cutoff
1954 || pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN
1955 || params->attachDictPref == ZSTD_dictForceAttach )
1956 && params->attachDictPref != ZSTD_dictForceCopy
1957 && !params->forceWindow ); /* dictMatchState isn't correctly
1958 * handled in _enforceMaxDist */
1959 }
1960
1961 static size_t
1962 ZSTD_resetCCtx_byAttachingCDict(ZSTD_CCtx* cctx,
1963 const ZSTD_CDict* cdict,
1964 ZSTD_CCtx_params params,
1965 U64 pledgedSrcSize,
1966 ZSTD_buffered_policy_e zbuff)
1967 {
1968 DEBUGLOG(4, "ZSTD_resetCCtx_byAttachingCDict() pledgedSrcSize=%llu",
1969 (unsigned long long)pledgedSrcSize);
1970 {
1971 ZSTD_compressionParameters adjusted_cdict_cParams = cdict->matchState.cParams;
1972 unsigned const windowLog = params.cParams.windowLog;
1973 assert(windowLog != 0);
1974 /* Resize working context table params for input only, since the dict
1975 * has its own tables. */
1976 /* pledgedSrcSize == 0 means 0! */
1977
1978 if (cdict->matchState.dedicatedDictSearch) {
1979 ZSTD_dedicatedDictSearch_revertCParams(&adjusted_cdict_cParams);
1980 }
1981
1982 params.cParams = ZSTD_adjustCParams_internal(adjusted_cdict_cParams, pledgedSrcSize,
1983 cdict->dictContentSize, ZSTD_cpm_attachDict);
1984 params.cParams.windowLog = windowLog;
1985 params.useRowMatchFinder = cdict->useRowMatchFinder; /* cdict overrides */
1986 FORWARD_IF_ERROR(ZSTD_resetCCtx_internal(cctx, ¶ms, pledgedSrcSize,
1987 /* loadedDictSize */ 0,
1988 ZSTDcrp_makeClean, zbuff), "");
1989 assert(cctx->appliedParams.cParams.strategy == adjusted_cdict_cParams.strategy);
1990 }
1991
1992 { const U32 cdictEnd = (U32)( cdict->matchState.window.nextSrc
1993 - cdict->matchState.window.base);
1994 const U32 cdictLen = cdictEnd - cdict->matchState.window.dictLimit;
1995 if (cdictLen == 0) {
1996 /* don't even attach dictionaries with no contents */
1997 DEBUGLOG(4, "skipping attaching empty dictionary");
1998 } else {
1999 DEBUGLOG(4, "attaching dictionary into context");
2000 cctx->blockState.matchState.dictMatchState = &cdict->matchState;
2001
2002 /* prep working match state so dict matches never have negative indices
2003 * when they are translated to the working context's index space. */
2004 if (cctx->blockState.matchState.window.dictLimit < cdictEnd) {
2005 cctx->blockState.matchState.window.nextSrc =
2006 cctx->blockState.matchState.window.base + cdictEnd;
2007 ZSTD_window_clear(&cctx->blockState.matchState.window);
2008 }
2009 /* loadedDictEnd is expressed within the referential of the active context */
2010 cctx->blockState.matchState.loadedDictEnd = cctx->blockState.matchState.window.dictLimit;
2011 } }
2012
2013 cctx->dictID = cdict->dictID;
2014 cctx->dictContentSize = cdict->dictContentSize;
2015
2016 /* copy block state */
2017 ZSTD_memcpy(cctx->blockState.prevCBlock, &cdict->cBlockState, sizeof(cdict->cBlockState));
2018
2019 return 0;
2020 }
2021
2022 static size_t ZSTD_resetCCtx_byCopyingCDict(ZSTD_CCtx* cctx,
2023 const ZSTD_CDict* cdict,
2024 ZSTD_CCtx_params params,
2025 U64 pledgedSrcSize,
2026 ZSTD_buffered_policy_e zbuff)
2027 {
2028 const ZSTD_compressionParameters *cdict_cParams = &cdict->matchState.cParams;
2029
2030 assert(!cdict->matchState.dedicatedDictSearch);
2031 DEBUGLOG(4, "ZSTD_resetCCtx_byCopyingCDict() pledgedSrcSize=%llu",
2032 (unsigned long long)pledgedSrcSize);
2033
2034 { unsigned const windowLog = params.cParams.windowLog;
2035 assert(windowLog != 0);
2036 /* Copy only compression parameters related to tables. */
2037 params.cParams = *cdict_cParams;
2038 params.cParams.windowLog = windowLog;
2039 params.useRowMatchFinder = cdict->useRowMatchFinder;
2040 FORWARD_IF_ERROR(ZSTD_resetCCtx_internal(cctx, ¶ms, pledgedSrcSize,
2041 /* loadedDictSize */ 0,
2042 ZSTDcrp_leaveDirty, zbuff), "");
2043 assert(cctx->appliedParams.cParams.strategy == cdict_cParams->strategy);
2044 assert(cctx->appliedParams.cParams.hashLog == cdict_cParams->hashLog);
2045 assert(cctx->appliedParams.cParams.chainLog == cdict_cParams->chainLog);
2046 }
2047
2048 ZSTD_cwksp_mark_tables_dirty(&cctx->workspace);
2049 assert(params.useRowMatchFinder != ZSTD_ps_auto);
2050
2051 /* copy tables */
2052 { size_t const chainSize = ZSTD_allocateChainTable(cdict_cParams->strategy, cdict->useRowMatchFinder, 0 /* DDS guaranteed disabled */)
2053 ? ((size_t)1 << cdict_cParams->chainLog)
2054 : 0;
2055 size_t const hSize = (size_t)1 << cdict_cParams->hashLog;
2056
2057 ZSTD_memcpy(cctx->blockState.matchState.hashTable,
2058 cdict->matchState.hashTable,
2059 hSize * sizeof(U32));
2060 /* Do not copy cdict's chainTable if cctx has parameters such that it would not use chainTable */
2061 if (ZSTD_allocateChainTable(cctx->appliedParams.cParams.strategy, cctx->appliedParams.useRowMatchFinder, 0 /* forDDSDict */)) {
2062 ZSTD_memcpy(cctx->blockState.matchState.chainTable,
2063 cdict->matchState.chainTable,
2064 chainSize * sizeof(U32));
2065 }
2066 /* copy tag table */
2067 if (ZSTD_rowMatchFinderUsed(cdict_cParams->strategy, cdict->useRowMatchFinder)) {
2068 size_t const tagTableSize = hSize*sizeof(U16);
2069 ZSTD_memcpy(cctx->blockState.matchState.tagTable,
2070 cdict->matchState.tagTable,
2071 tagTableSize);
2072 }
2073 }
2074
2075 /* Zero the hashTable3, since the cdict never fills it */
2076 { int const h3log = cctx->blockState.matchState.hashLog3;
2077 size_t const h3Size = h3log ? ((size_t)1 << h3log) : 0;
2078 assert(cdict->matchState.hashLog3 == 0);
2079 ZSTD_memset(cctx->blockState.matchState.hashTable3, 0, h3Size * sizeof(U32));
2080 }
2081
2082 ZSTD_cwksp_mark_tables_clean(&cctx->workspace);
2083
2084 /* copy dictionary offsets */
2085 { ZSTD_matchState_t const* srcMatchState = &cdict->matchState;
2086 ZSTD_matchState_t* dstMatchState = &cctx->blockState.matchState;
2087 dstMatchState->window = srcMatchState->window;
2088 dstMatchState->nextToUpdate = srcMatchState->nextToUpdate;
2089 dstMatchState->loadedDictEnd= srcMatchState->loadedDictEnd;
2090 }
2091
2092 cctx->dictID = cdict->dictID;
2093 cctx->dictContentSize = cdict->dictContentSize;
2094
2095 /* copy block state */
2096 ZSTD_memcpy(cctx->blockState.prevCBlock, &cdict->cBlockState, sizeof(cdict->cBlockState));
2097
2098 return 0;
2099 }
2100
2101 /* We have a choice between copying the dictionary context into the working
2102 * context, or referencing the dictionary context from the working context
2103 * in-place. We decide here which strategy to use. */
2104 static size_t ZSTD_resetCCtx_usingCDict(ZSTD_CCtx* cctx,
2105 const ZSTD_CDict* cdict,
2106 const ZSTD_CCtx_params* params,
2107 U64 pledgedSrcSize,
2108 ZSTD_buffered_policy_e zbuff)
2109 {
2110
2111 DEBUGLOG(4, "ZSTD_resetCCtx_usingCDict (pledgedSrcSize=%u)",
2112 (unsigned)pledgedSrcSize);
2113
2114 if (ZSTD_shouldAttachDict(cdict, params, pledgedSrcSize)) {
2115 return ZSTD_resetCCtx_byAttachingCDict(
2116 cctx, cdict, *params, pledgedSrcSize, zbuff);
2117 } else {
2118 return ZSTD_resetCCtx_byCopyingCDict(
2119 cctx, cdict, *params, pledgedSrcSize, zbuff);
2120 }
2121 }
2122
2123 /*! ZSTD_copyCCtx_internal() :
2124 * Duplicate an existing context `srcCCtx` into another one `dstCCtx`.
2125 * Only works during stage ZSTDcs_init (i.e. after creation, but before first call to ZSTD_compressContinue()).
2126 * The "context", in this case, refers to the hash and chain tables,
2127 * entropy tables, and dictionary references.
2128 * `windowLog` value is enforced if != 0, otherwise value is copied from srcCCtx.
2129 * @return : 0, or an error code */
2130 static size_t ZSTD_copyCCtx_internal(ZSTD_CCtx* dstCCtx,
2131 const ZSTD_CCtx* srcCCtx,
2132 ZSTD_frameParameters fParams,
2133 U64 pledgedSrcSize,
2134 ZSTD_buffered_policy_e zbuff)
2135 {
2136 RETURN_ERROR_IF(srcCCtx->stage!=ZSTDcs_init, stage_wrong,
2137 "Can't copy a ctx that's not in init stage.");
2138 DEBUGLOG(5, "ZSTD_copyCCtx_internal");
2139 ZSTD_memcpy(&dstCCtx->customMem, &srcCCtx->customMem, sizeof(ZSTD_customMem));
2140 { ZSTD_CCtx_params params = dstCCtx->requestedParams;
2141 /* Copy only compression parameters related to tables. */
2142 params.cParams = srcCCtx->appliedParams.cParams;
2143 assert(srcCCtx->appliedParams.useRowMatchFinder != ZSTD_ps_auto);
2144 assert(srcCCtx->appliedParams.useBlockSplitter != ZSTD_ps_auto);
2145 assert(srcCCtx->appliedParams.ldmParams.enableLdm != ZSTD_ps_auto);
2146 params.useRowMatchFinder = srcCCtx->appliedParams.useRowMatchFinder;
2147 params.useBlockSplitter = srcCCtx->appliedParams.useBlockSplitter;
2148 params.ldmParams = srcCCtx->appliedParams.ldmParams;
2149 params.fParams = fParams;
2150 ZSTD_resetCCtx_internal(dstCCtx, ¶ms, pledgedSrcSize,
2151 /* loadedDictSize */ 0,
2152 ZSTDcrp_leaveDirty, zbuff);
2153 assert(dstCCtx->appliedParams.cParams.windowLog == srcCCtx->appliedParams.cParams.windowLog);
2154 assert(dstCCtx->appliedParams.cParams.strategy == srcCCtx->appliedParams.cParams.strategy);
2155 assert(dstCCtx->appliedParams.cParams.hashLog == srcCCtx->appliedParams.cParams.hashLog);
2156 assert(dstCCtx->appliedParams.cParams.chainLog == srcCCtx->appliedParams.cParams.chainLog);
2157 assert(dstCCtx->blockState.matchState.hashLog3 == srcCCtx->blockState.matchState.hashLog3);
2158 }
2159
2160 ZSTD_cwksp_mark_tables_dirty(&dstCCtx->workspace);
2161
2162 /* copy tables */
2163 { size_t const chainSize = ZSTD_allocateChainTable(srcCCtx->appliedParams.cParams.strategy,
2164 srcCCtx->appliedParams.useRowMatchFinder,
2165 0 /* forDDSDict */)
2166 ? ((size_t)1 << srcCCtx->appliedParams.cParams.chainLog)
2167 : 0;
2168 size_t const hSize = (size_t)1 << srcCCtx->appliedParams.cParams.hashLog;
2169 int const h3log = srcCCtx->blockState.matchState.hashLog3;
2170 size_t const h3Size = h3log ? ((size_t)1 << h3log) : 0;
2171
2172 ZSTD_memcpy(dstCCtx->blockState.matchState.hashTable,
2173 srcCCtx->blockState.matchState.hashTable,
2174 hSize * sizeof(U32));
2175 ZSTD_memcpy(dstCCtx->blockState.matchState.chainTable,
2176 srcCCtx->blockState.matchState.chainTable,
2177 chainSize * sizeof(U32));
2178 ZSTD_memcpy(dstCCtx->blockState.matchState.hashTable3,
2179 srcCCtx->blockState.matchState.hashTable3,
2180 h3Size * sizeof(U32));
2181 }
2182
2183 ZSTD_cwksp_mark_tables_clean(&dstCCtx->workspace);
2184
2185 /* copy dictionary offsets */
2186 {
2187 const ZSTD_matchState_t* srcMatchState = &srcCCtx->blockState.matchState;
2188 ZSTD_matchState_t* dstMatchState = &dstCCtx->blockState.matchState;
2189 dstMatchState->window = srcMatchState->window;
2190 dstMatchState->nextToUpdate = srcMatchState->nextToUpdate;
2191 dstMatchState->loadedDictEnd= srcMatchState->loadedDictEnd;
2192 }
2193 dstCCtx->dictID = srcCCtx->dictID;
2194 dstCCtx->dictContentSize = srcCCtx->dictContentSize;
2195
2196 /* copy block state */
2197 ZSTD_memcpy(dstCCtx->blockState.prevCBlock, srcCCtx->blockState.prevCBlock, sizeof(*srcCCtx->blockState.prevCBlock));
2198
2199 return 0;
2200 }
2201
2202 /*! ZSTD_copyCCtx() :
2203 * Duplicate an existing context `srcCCtx` into another one `dstCCtx`.
2204 * Only works during stage ZSTDcs_init (i.e. after creation, but before first call to ZSTD_compressContinue()).
2205 * pledgedSrcSize==0 means "unknown".
2206 * @return : 0, or an error code */
2207 size_t ZSTD_copyCCtx(ZSTD_CCtx* dstCCtx, const ZSTD_CCtx* srcCCtx, unsigned long long pledgedSrcSize)
2208 {
2209 ZSTD_frameParameters fParams = { 1 /*content*/, 0 /*checksum*/, 0 /*noDictID*/ };
2210 ZSTD_buffered_policy_e const zbuff = srcCCtx->bufferedPolicy;
2211 ZSTD_STATIC_ASSERT((U32)ZSTDb_buffered==1);
2212 if (pledgedSrcSize==0) pledgedSrcSize = ZSTD_CONTENTSIZE_UNKNOWN;
2213 fParams.contentSizeFlag = (pledgedSrcSize != ZSTD_CONTENTSIZE_UNKNOWN);
2214
2215 return ZSTD_copyCCtx_internal(dstCCtx, srcCCtx,
2216 fParams, pledgedSrcSize,
2217 zbuff);
2218 }
2219
2220
2221 #define ZSTD_ROWSIZE 16
2222 /*! ZSTD_reduceTable() :
2223 * reduce table indexes by `reducerValue`, or squash to zero.
2224 * PreserveMark preserves "unsorted mark" for btlazy2 strategy.
2225 * It must be set to a clear 0/1 value, to remove branch during inlining.
2226 * Presume table size is a multiple of ZSTD_ROWSIZE
2227 * to help auto-vectorization */
2228 FORCE_INLINE_TEMPLATE void
2229 ZSTD_reduceTable_internal (U32* const table, U32 const size, U32 const reducerValue, int const preserveMark)
2230 {
2231 int const nbRows = (int)size / ZSTD_ROWSIZE;
2232 int cellNb = 0;
2233 int rowNb;
2234 /* Protect special index values < ZSTD_WINDOW_START_INDEX. */
2235 U32 const reducerThreshold = reducerValue + ZSTD_WINDOW_START_INDEX;
2236 assert((size & (ZSTD_ROWSIZE-1)) == 0); /* multiple of ZSTD_ROWSIZE */
2237 assert(size < (1U<<31)); /* can be casted to int */
2238
2239
2240 for (rowNb=0 ; rowNb < nbRows ; rowNb++) {
2241 int column;
2242 for (column=0; column<ZSTD_ROWSIZE; column++) {
2243 U32 newVal;
2244 if (preserveMark && table[cellNb] == ZSTD_DUBT_UNSORTED_MARK) {
2245 /* This write is pointless, but is required(?) for the compiler
2246 * to auto-vectorize the loop. */
2247 newVal = ZSTD_DUBT_UNSORTED_MARK;
2248 } else if (table[cellNb] < reducerThreshold) {
2249 newVal = 0;
2250 } else {
2251 newVal = table[cellNb] - reducerValue;
2252 }
2253 table[cellNb] = newVal;
2254 cellNb++;
2255 } }
2256 }
2257
2258 static void ZSTD_reduceTable(U32* const table, U32 const size, U32 const reducerValue)
2259 {
2260 ZSTD_reduceTable_internal(table, size, reducerValue, 0);
2261 }
2262
2263 static void ZSTD_reduceTable_btlazy2(U32* const table, U32 const size, U32 const reducerValue)
2264 {
2265 ZSTD_reduceTable_internal(table, size, reducerValue, 1);
2266 }
2267
2268 /*! ZSTD_reduceIndex() :
2269 * rescale all indexes to avoid future overflow (indexes are U32) */
2270 static void ZSTD_reduceIndex (ZSTD_matchState_t* ms, ZSTD_CCtx_params const* params, const U32 reducerValue)
2271 {
2272 { U32 const hSize = (U32)1 << params->cParams.hashLog;
2273 ZSTD_reduceTable(ms->hashTable, hSize, reducerValue);
2274 }
2275
2276 if (ZSTD_allocateChainTable(params->cParams.strategy, params->useRowMatchFinder, (U32)ms->dedicatedDictSearch)) {
2277 U32 const chainSize = (U32)1 << params->cParams.chainLog;
2278 if (params->cParams.strategy == ZSTD_btlazy2)
2279 ZSTD_reduceTable_btlazy2(ms->chainTable, chainSize, reducerValue);
2280 else
2281 ZSTD_reduceTable(ms->chainTable, chainSize, reducerValue);
2282 }
2283
2284 if (ms->hashLog3) {
2285 U32 const h3Size = (U32)1 << ms->hashLog3;
2286 ZSTD_reduceTable(ms->hashTable3, h3Size, reducerValue);
2287 }
2288 }
2289
2290
2291 /*-*******************************************************
2292 * Block entropic compression
2293 *********************************************************/
2294
2295 /* See doc/zstd_compression_format.md for detailed format description */
2296
2297 void ZSTD_seqToCodes(const seqStore_t* seqStorePtr)
2298 {
2299 const seqDef* const sequences = seqStorePtr->sequencesStart;
2300 BYTE* const llCodeTable = seqStorePtr->llCode;
2301 BYTE* const ofCodeTable = seqStorePtr->ofCode;
2302 BYTE* const mlCodeTable = seqStorePtr->mlCode;
2303 U32 const nbSeq = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
2304 U32 u;
2305 assert(nbSeq <= seqStorePtr->maxNbSeq);
2306 for (u=0; u<nbSeq; u++) {
2307 U32 const llv = sequences[u].litLength;
2308 U32 const mlv = sequences[u].mlBase;
2309 llCodeTable[u] = (BYTE)ZSTD_LLcode(llv);
2310 ofCodeTable[u] = (BYTE)ZSTD_highbit32(sequences[u].offBase);
2311 mlCodeTable[u] = (BYTE)ZSTD_MLcode(mlv);
2312 }
2313 if (seqStorePtr->longLengthType==ZSTD_llt_literalLength)
2314 llCodeTable[seqStorePtr->longLengthPos] = MaxLL;
2315 if (seqStorePtr->longLengthType==ZSTD_llt_matchLength)
2316 mlCodeTable[seqStorePtr->longLengthPos] = MaxML;
2317 }
2318
2319 /* ZSTD_useTargetCBlockSize():
2320 * Returns if target compressed block size param is being used.
2321 * If used, compression will do best effort to make a compressed block size to be around targetCBlockSize.
2322 * Returns 1 if true, 0 otherwise. */
2323 static int ZSTD_useTargetCBlockSize(const ZSTD_CCtx_params* cctxParams)
2324 {
2325 DEBUGLOG(5, "ZSTD_useTargetCBlockSize (targetCBlockSize=%zu)", cctxParams->targetCBlockSize);
2326 return (cctxParams->targetCBlockSize != 0);
2327 }
2328
2329 /* ZSTD_blockSplitterEnabled():
2330 * Returns if block splitting param is being used
2331 * If used, compression will do best effort to split a block in order to improve compression ratio.
2332 * At the time this function is called, the parameter must be finalized.
2333 * Returns 1 if true, 0 otherwise. */
2334 static int ZSTD_blockSplitterEnabled(ZSTD_CCtx_params* cctxParams)
2335 {
2336 DEBUGLOG(5, "ZSTD_blockSplitterEnabled (useBlockSplitter=%d)", cctxParams->useBlockSplitter);
2337 assert(cctxParams->useBlockSplitter != ZSTD_ps_auto);
2338 return (cctxParams->useBlockSplitter == ZSTD_ps_enable);
2339 }
2340
2341 /* Type returned by ZSTD_buildSequencesStatistics containing finalized symbol encoding types
2342 * and size of the sequences statistics
2343 */
2344 typedef struct {
2345 U32 LLtype;
2346 U32 Offtype;
2347 U32 MLtype;
2348 size_t size;
2349 size_t lastCountSize; /* Accounts for bug in 1.3.4. More detail in ZSTD_entropyCompressSeqStore_internal() */
2350 } ZSTD_symbolEncodingTypeStats_t;
2351
2352 /* ZSTD_buildSequencesStatistics():
2353 * Returns a ZSTD_symbolEncodingTypeStats_t, or a zstd error code in the `size` field.
2354 * Modifies `nextEntropy` to have the appropriate values as a side effect.
2355 * nbSeq must be greater than 0.
2356 *
2357 * entropyWkspSize must be of size at least ENTROPY_WORKSPACE_SIZE - (MaxSeq + 1)*sizeof(U32)
2358 */
2359 static ZSTD_symbolEncodingTypeStats_t
2360 ZSTD_buildSequencesStatistics(seqStore_t* seqStorePtr, size_t nbSeq,
2361 const ZSTD_fseCTables_t* prevEntropy, ZSTD_fseCTables_t* nextEntropy,
2362 BYTE* dst, const BYTE* const dstEnd,
2363 ZSTD_strategy strategy, unsigned* countWorkspace,
2364 void* entropyWorkspace, size_t entropyWkspSize) {
2365 BYTE* const ostart = dst;
2366 const BYTE* const oend = dstEnd;
2367 BYTE* op = ostart;
2368 FSE_CTable* CTable_LitLength = nextEntropy->litlengthCTable;
2369 FSE_CTable* CTable_OffsetBits = nextEntropy->offcodeCTable;
2370 FSE_CTable* CTable_MatchLength = nextEntropy->matchlengthCTable;
2371 const BYTE* const ofCodeTable = seqStorePtr->ofCode;
2372 const BYTE* const llCodeTable = seqStorePtr->llCode;
2373 const BYTE* const mlCodeTable = seqStorePtr->mlCode;
2374 ZSTD_symbolEncodingTypeStats_t stats;
2375
2376 stats.lastCountSize = 0;
2377 /* convert length/distances into codes */
2378 ZSTD_seqToCodes(seqStorePtr);
2379 assert(op <= oend);
2380 assert(nbSeq != 0); /* ZSTD_selectEncodingType() divides by nbSeq */
2381 /* build CTable for Literal Lengths */
2382 { unsigned max = MaxLL;
2383 size_t const mostFrequent = HIST_countFast_wksp(countWorkspace, &max, llCodeTable, nbSeq, entropyWorkspace, entropyWkspSize); /* can't fail */
2384 DEBUGLOG(5, "Building LL table");
2385 nextEntropy->litlength_repeatMode = prevEntropy->litlength_repeatMode;
2386 stats.LLtype = ZSTD_selectEncodingType(&nextEntropy->litlength_repeatMode,
2387 countWorkspace, max, mostFrequent, nbSeq,
2388 LLFSELog, prevEntropy->litlengthCTable,
2389 LL_defaultNorm, LL_defaultNormLog,
2390 ZSTD_defaultAllowed, strategy);
2391 assert(set_basic < set_compressed && set_rle < set_compressed);
2392 assert(!(stats.LLtype < set_compressed && nextEntropy->litlength_repeatMode != FSE_repeat_none)); /* We don't copy tables */
2393 { size_t const countSize = ZSTD_buildCTable(
2394 op, (size_t)(oend - op),
2395 CTable_LitLength, LLFSELog, (symbolEncodingType_e)stats.LLtype,
2396 countWorkspace, max, llCodeTable, nbSeq,
2397 LL_defaultNorm, LL_defaultNormLog, MaxLL,
2398 prevEntropy->litlengthCTable,
2399 sizeof(prevEntropy->litlengthCTable),
2400 entropyWorkspace, entropyWkspSize);
2401 if (ZSTD_isError(countSize)) {
2402 DEBUGLOG(3, "ZSTD_buildCTable for LitLens failed");
2403 stats.size = countSize;
2404 return stats;
2405 }
2406 if (stats.LLtype == set_compressed)
2407 stats.lastCountSize = countSize;
2408 op += countSize;
2409 assert(op <= oend);
2410 } }
2411 /* build CTable for Offsets */
2412 { unsigned max = MaxOff;
2413 size_t const mostFrequent = HIST_countFast_wksp(
2414 countWorkspace, &max, ofCodeTable, nbSeq, entropyWorkspace, entropyWkspSize); /* can't fail */
2415 /* We can only use the basic table if max <= DefaultMaxOff, otherwise the offsets are too large */
2416 ZSTD_defaultPolicy_e const defaultPolicy = (max <= DefaultMaxOff) ? ZSTD_defaultAllowed : ZSTD_defaultDisallowed;
2417 DEBUGLOG(5, "Building OF table");
2418 nextEntropy->offcode_repeatMode = prevEntropy->offcode_repeatMode;
2419 stats.Offtype = ZSTD_selectEncodingType(&nextEntropy->offcode_repeatMode,
2420 countWorkspace, max, mostFrequent, nbSeq,
2421 OffFSELog, prevEntropy->offcodeCTable,
2422 OF_defaultNorm, OF_defaultNormLog,
2423 defaultPolicy, strategy);
2424 assert(!(stats.Offtype < set_compressed && nextEntropy->offcode_repeatMode != FSE_repeat_none)); /* We don't copy tables */
2425 { size_t const countSize = ZSTD_buildCTable(
2426 op, (size_t)(oend - op),
2427 CTable_OffsetBits, OffFSELog, (symbolEncodingType_e)stats.Offtype,
2428 countWorkspace, max, ofCodeTable, nbSeq,
2429 OF_defaultNorm, OF_defaultNormLog, DefaultMaxOff,
2430 prevEntropy->offcodeCTable,
2431 sizeof(prevEntropy->offcodeCTable),
2432 entropyWorkspace, entropyWkspSize);
2433 if (ZSTD_isError(countSize)) {
2434 DEBUGLOG(3, "ZSTD_buildCTable for Offsets failed");
2435 stats.size = countSize;
2436 return stats;
2437 }
2438 if (stats.Offtype == set_compressed)
2439 stats.lastCountSize = countSize;
2440 op += countSize;
2441 assert(op <= oend);
2442 } }
2443 /* build CTable for MatchLengths */
2444 { unsigned max = MaxML;
2445 size_t const mostFrequent = HIST_countFast_wksp(
2446 countWorkspace, &max, mlCodeTable, nbSeq, entropyWorkspace, entropyWkspSize); /* can't fail */
2447 DEBUGLOG(5, "Building ML table (remaining space : %i)", (int)(oend-op));
2448 nextEntropy->matchlength_repeatMode = prevEntropy->matchlength_repeatMode;
2449 stats.MLtype = ZSTD_selectEncodingType(&nextEntropy->matchlength_repeatMode,
2450 countWorkspace, max, mostFrequent, nbSeq,
2451 MLFSELog, prevEntropy->matchlengthCTable,
2452 ML_defaultNorm, ML_defaultNormLog,
2453 ZSTD_defaultAllowed, strategy);
2454 assert(!(stats.MLtype < set_compressed && nextEntropy->matchlength_repeatMode != FSE_repeat_none)); /* We don't copy tables */
2455 { size_t const countSize = ZSTD_buildCTable(
2456 op, (size_t)(oend - op),
2457 CTable_MatchLength, MLFSELog, (symbolEncodingType_e)stats.MLtype,
2458 countWorkspace, max, mlCodeTable, nbSeq,
2459 ML_defaultNorm, ML_defaultNormLog, MaxML,
2460 prevEntropy->matchlengthCTable,
2461 sizeof(prevEntropy->matchlengthCTable),
2462 entropyWorkspace, entropyWkspSize);
2463 if (ZSTD_isError(countSize)) {
2464 DEBUGLOG(3, "ZSTD_buildCTable for MatchLengths failed");
2465 stats.size = countSize;
2466 return stats;
2467 }
2468 if (stats.MLtype == set_compressed)
2469 stats.lastCountSize = countSize;
2470 op += countSize;
2471 assert(op <= oend);
2472 } }
2473 stats.size = (size_t)(op-ostart);
2474 return stats;
2475 }
2476
2477 /* ZSTD_entropyCompressSeqStore_internal():
2478 * compresses both literals and sequences
2479 * Returns compressed size of block, or a zstd error.
2480 */
2481 #define SUSPECT_UNCOMPRESSIBLE_LITERAL_RATIO 20
2482 MEM_STATIC size_t
2483 ZSTD_entropyCompressSeqStore_internal(seqStore_t* seqStorePtr,
2484 const ZSTD_entropyCTables_t* prevEntropy,
2485 ZSTD_entropyCTables_t* nextEntropy,
2486 const ZSTD_CCtx_params* cctxParams,
2487 void* dst, size_t dstCapacity,
2488 void* entropyWorkspace, size_t entropyWkspSize,
2489 const int bmi2)
2490 {
2491 const int longOffsets = cctxParams->cParams.windowLog > STREAM_ACCUMULATOR_MIN;
2492 ZSTD_strategy const strategy = cctxParams->cParams.strategy;
2493 unsigned* count = (unsigned*)entropyWorkspace;
2494 FSE_CTable* CTable_LitLength = nextEntropy->fse.litlengthCTable;
2495 FSE_CTable* CTable_OffsetBits = nextEntropy->fse.offcodeCTable;
2496 FSE_CTable* CTable_MatchLength = nextEntropy->fse.matchlengthCTable;
2497 const seqDef* const sequences = seqStorePtr->sequencesStart;
2498 const size_t nbSeq = seqStorePtr->sequences - seqStorePtr->sequencesStart;
2499 const BYTE* const ofCodeTable = seqStorePtr->ofCode;
2500 const BYTE* const llCodeTable = seqStorePtr->llCode;
2501 const BYTE* const mlCodeTable = seqStorePtr->mlCode;
2502 BYTE* const ostart = (BYTE*)dst;
2503 BYTE* const oend = ostart + dstCapacity;
2504 BYTE* op = ostart;
2505 size_t lastCountSize;
2506
2507 entropyWorkspace = count + (MaxSeq + 1);
2508 entropyWkspSize -= (MaxSeq + 1) * sizeof(*count);
2509
2510 DEBUGLOG(4, "ZSTD_entropyCompressSeqStore_internal (nbSeq=%zu)", nbSeq);
2511 ZSTD_STATIC_ASSERT(HUF_WORKSPACE_SIZE >= (1<<MAX(MLFSELog,LLFSELog)));
2512 assert(entropyWkspSize >= HUF_WORKSPACE_SIZE);
2513
2514 /* Compress literals */
2515 { const BYTE* const literals = seqStorePtr->litStart;
2516 size_t const numSequences = seqStorePtr->sequences - seqStorePtr->sequencesStart;
2517 size_t const numLiterals = seqStorePtr->lit - seqStorePtr->litStart;
2518 /* Base suspicion of uncompressibility on ratio of literals to sequences */
2519 unsigned const suspectUncompressible = (numSequences == 0) || (numLiterals / numSequences >= SUSPECT_UNCOMPRESSIBLE_LITERAL_RATIO);
2520 size_t const litSize = (size_t)(seqStorePtr->lit - literals);
2521 size_t const cSize = ZSTD_compressLiterals(
2522 &prevEntropy->huf, &nextEntropy->huf,
2523 cctxParams->cParams.strategy,
2524 ZSTD_literalsCompressionIsDisabled(cctxParams),
2525 op, dstCapacity,
2526 literals, litSize,
2527 entropyWorkspace, entropyWkspSize,
2528 bmi2, suspectUncompressible);
2529 FORWARD_IF_ERROR(cSize, "ZSTD_compressLiterals failed");
2530 assert(cSize <= dstCapacity);
2531 op += cSize;
2532 }
2533
2534 /* Sequences Header */
2535 RETURN_ERROR_IF((oend-op) < 3 /*max nbSeq Size*/ + 1 /*seqHead*/,
2536 dstSize_tooSmall, "Can't fit seq hdr in output buf!");
2537 if (nbSeq < 128) {
2538 *op++ = (BYTE)nbSeq;
2539 } else if (nbSeq < LONGNBSEQ) {
2540 op[0] = (BYTE)((nbSeq>>8) + 0x80);
2541 op[1] = (BYTE)nbSeq;
2542 op+=2;
2543 } else {
2544 op[0]=0xFF;
2545 MEM_writeLE16(op+1, (U16)(nbSeq - LONGNBSEQ));
2546 op+=3;
2547 }
2548 assert(op <= oend);
2549 if (nbSeq==0) {
2550 /* Copy the old tables over as if we repeated them */
2551 ZSTD_memcpy(&nextEntropy->fse, &prevEntropy->fse, sizeof(prevEntropy->fse));
2552 return (size_t)(op - ostart);
2553 }
2554 {
2555 ZSTD_symbolEncodingTypeStats_t stats;
2556 BYTE* seqHead = op++;
2557 /* build stats for sequences */
2558 stats = ZSTD_buildSequencesStatistics(seqStorePtr, nbSeq,
2559 &prevEntropy->fse, &nextEntropy->fse,
2560 op, oend,
2561 strategy, count,
2562 entropyWorkspace, entropyWkspSize);
2563 FORWARD_IF_ERROR(stats.size, "ZSTD_buildSequencesStatistics failed!");
2564 *seqHead = (BYTE)((stats.LLtype<<6) + (stats.Offtype<<4) + (stats.MLtype<<2));
2565 lastCountSize = stats.lastCountSize;
2566 op += stats.size;
2567 }
2568
2569 { size_t const bitstreamSize = ZSTD_encodeSequences(
2570 op, (size_t)(oend - op),
2571 CTable_MatchLength, mlCodeTable,
2572 CTable_OffsetBits, ofCodeTable,
2573 CTable_LitLength, llCodeTable,
2574 sequences, nbSeq,
2575 longOffsets, bmi2);
2576 FORWARD_IF_ERROR(bitstreamSize, "ZSTD_encodeSequences failed");
2577 op += bitstreamSize;
2578 assert(op <= oend);
2579 /* zstd versions <= 1.3.4 mistakenly report corruption when
2580 * FSE_readNCount() receives a buffer < 4 bytes.
2581 * Fixed by https://github.com/facebook/zstd/pull/1146.
2582 * This can happen when the last set_compressed table present is 2
2583 * bytes and the bitstream is only one byte.
2584 * In this exceedingly rare case, we will simply emit an uncompressed
2585 * block, since it isn't worth optimizing.
2586 */
2587 if (lastCountSize && (lastCountSize + bitstreamSize) < 4) {
2588 /* lastCountSize >= 2 && bitstreamSize > 0 ==> lastCountSize == 3 */
2589 assert(lastCountSize + bitstreamSize == 3);
2590 DEBUGLOG(5, "Avoiding bug in zstd decoder in versions <= 1.3.4 by "
2591 "emitting an uncompressed block.");
2592 return 0;
2593 }
2594 }
2595
2596 DEBUGLOG(5, "compressed block size : %u", (unsigned)(op - ostart));
2597 return (size_t)(op - ostart);
2598 }
2599
2600 MEM_STATIC size_t
2601 ZSTD_entropyCompressSeqStore(seqStore_t* seqStorePtr,
2602 const ZSTD_entropyCTables_t* prevEntropy,
2603 ZSTD_entropyCTables_t* nextEntropy,
2604 const ZSTD_CCtx_params* cctxParams,
2605 void* dst, size_t dstCapacity,
2606 size_t srcSize,
2607 void* entropyWorkspace, size_t entropyWkspSize,
2608 int bmi2)
2609 {
2610 size_t const cSize = ZSTD_entropyCompressSeqStore_internal(
2611 seqStorePtr, prevEntropy, nextEntropy, cctxParams,
2612 dst, dstCapacity,
2613 entropyWorkspace, entropyWkspSize, bmi2);
2614 if (cSize == 0) return 0;
2615 /* When srcSize <= dstCapacity, there is enough space to write a raw uncompressed block.
2616 * Since we ran out of space, block must be not compressible, so fall back to raw uncompressed block.
2617 */
2618 if ((cSize == ERROR(dstSize_tooSmall)) & (srcSize <= dstCapacity))
2619 return 0; /* block not compressed */
2620 FORWARD_IF_ERROR(cSize, "ZSTD_entropyCompressSeqStore_internal failed");
2621
2622 /* Check compressibility */
2623 { size_t const maxCSize = srcSize - ZSTD_minGain(srcSize, cctxParams->cParams.strategy);
2624 if (cSize >= maxCSize) return 0; /* block not compressed */
2625 }
2626 DEBUGLOG(4, "ZSTD_entropyCompressSeqStore() cSize: %zu", cSize);
2627 return cSize;
2628 }
2629
2630 /* ZSTD_selectBlockCompressor() :
2631 * Not static, but internal use only (used by long distance matcher)
2632 * assumption : strat is a valid strategy */
2633 ZSTD_blockCompressor ZSTD_selectBlockCompressor(ZSTD_strategy strat, ZSTD_paramSwitch_e useRowMatchFinder, ZSTD_dictMode_e dictMode)
2634 {
2635 static const ZSTD_blockCompressor blockCompressor[4][ZSTD_STRATEGY_MAX+1] = {
2636 { ZSTD_compressBlock_fast /* default for 0 */,
2637 ZSTD_compressBlock_fast,
2638 ZSTD_compressBlock_doubleFast,
2639 ZSTD_compressBlock_greedy,
2640 ZSTD_compressBlock_lazy,
2641 ZSTD_compressBlock_lazy2,
2642 ZSTD_compressBlock_btlazy2,
2643 ZSTD_compressBlock_btopt,
2644 ZSTD_compressBlock_btultra,
2645 ZSTD_compressBlock_btultra2 },
2646 { ZSTD_compressBlock_fast_extDict /* default for 0 */,
2647 ZSTD_compressBlock_fast_extDict,
2648 ZSTD_compressBlock_doubleFast_extDict,
2649 ZSTD_compressBlock_greedy_extDict,
2650 ZSTD_compressBlock_lazy_extDict,
2651 ZSTD_compressBlock_lazy2_extDict,
2652 ZSTD_compressBlock_btlazy2_extDict,
2653 ZSTD_compressBlock_btopt_extDict,
2654 ZSTD_compressBlock_btultra_extDict,
2655 ZSTD_compressBlock_btultra_extDict },
2656 { ZSTD_compressBlock_fast_dictMatchState /* default for 0 */,
2657 ZSTD_compressBlock_fast_dictMatchState,
2658 ZSTD_compressBlock_doubleFast_dictMatchState,
2659 ZSTD_compressBlock_greedy_dictMatchState,
2660 ZSTD_compressBlock_lazy_dictMatchState,
2661 ZSTD_compressBlock_lazy2_dictMatchState,
2662 ZSTD_compressBlock_btlazy2_dictMatchState,
2663 ZSTD_compressBlock_btopt_dictMatchState,
2664 ZSTD_compressBlock_btultra_dictMatchState,
2665 ZSTD_compressBlock_btultra_dictMatchState },
2666 { NULL /* default for 0 */,
2667 NULL,
2668 NULL,
2669 ZSTD_compressBlock_greedy_dedicatedDictSearch,
2670 ZSTD_compressBlock_lazy_dedicatedDictSearch,
2671 ZSTD_compressBlock_lazy2_dedicatedDictSearch,
2672 NULL,
2673 NULL,
2674 NULL,
2675 NULL }
2676 };
2677 ZSTD_blockCompressor selectedCompressor;
2678 ZSTD_STATIC_ASSERT((unsigned)ZSTD_fast == 1);
2679
2680 assert(ZSTD_cParam_withinBounds(ZSTD_c_strategy, strat));
2681 DEBUGLOG(4, "Selected block compressor: dictMode=%d strat=%d rowMatchfinder=%d", (int)dictMode, (int)strat, (int)useRowMatchFinder);
2682 if (ZSTD_rowMatchFinderUsed(strat, useRowMatchFinder)) {
2683 static const ZSTD_blockCompressor rowBasedBlockCompressors[4][3] = {
2684 { ZSTD_compressBlock_greedy_row,
2685 ZSTD_compressBlock_lazy_row,
2686 ZSTD_compressBlock_lazy2_row },
2687 { ZSTD_compressBlock_greedy_extDict_row,
2688 ZSTD_compressBlock_lazy_extDict_row,
2689 ZSTD_compressBlock_lazy2_extDict_row },
2690 { ZSTD_compressBlock_greedy_dictMatchState_row,
2691 ZSTD_compressBlock_lazy_dictMatchState_row,
2692 ZSTD_compressBlock_lazy2_dictMatchState_row },
2693 { ZSTD_compressBlock_greedy_dedicatedDictSearch_row,
2694 ZSTD_compressBlock_lazy_dedicatedDictSearch_row,
2695 ZSTD_compressBlock_lazy2_dedicatedDictSearch_row }
2696 };
2697 DEBUGLOG(4, "Selecting a row-based matchfinder");
2698 assert(useRowMatchFinder != ZSTD_ps_auto);
2699 selectedCompressor = rowBasedBlockCompressors[(int)dictMode][(int)strat - (int)ZSTD_greedy];
2700 } else {
2701 selectedCompressor = blockCompressor[(int)dictMode][(int)strat];
2702 }
2703 assert(selectedCompressor != NULL);
2704 return selectedCompressor;
2705 }
2706
2707 static void ZSTD_storeLastLiterals(seqStore_t* seqStorePtr,
2708 const BYTE* anchor, size_t lastLLSize)
2709 {
2710 ZSTD_memcpy(seqStorePtr->lit, anchor, lastLLSize);
2711 seqStorePtr->lit += lastLLSize;
2712 }
2713
2714 void ZSTD_resetSeqStore(seqStore_t* ssPtr)
2715 {
2716 ssPtr->lit = ssPtr->litStart;
2717 ssPtr->sequences = ssPtr->sequencesStart;
2718 ssPtr->longLengthType = ZSTD_llt_none;
2719 }
2720
2721 typedef enum { ZSTDbss_compress, ZSTDbss_noCompress } ZSTD_buildSeqStore_e;
2722
2723 static size_t ZSTD_buildSeqStore(ZSTD_CCtx* zc, const void* src, size_t srcSize)
2724 {
2725 ZSTD_matchState_t* const ms = &zc->blockState.matchState;
2726 DEBUGLOG(5, "ZSTD_buildSeqStore (srcSize=%zu)", srcSize);
2727 assert(srcSize <= ZSTD_BLOCKSIZE_MAX);
2728 /* Assert that we have correctly flushed the ctx params into the ms's copy */
2729 ZSTD_assertEqualCParams(zc->appliedParams.cParams, ms->cParams);
2730 if (srcSize < MIN_CBLOCK_SIZE+ZSTD_blockHeaderSize+1) {
2731 if (zc->appliedParams.cParams.strategy >= ZSTD_btopt) {
2732 ZSTD_ldm_skipRawSeqStoreBytes(&zc->externSeqStore, srcSize);
2733 } else {
2734 ZSTD_ldm_skipSequences(&zc->externSeqStore, srcSize, zc->appliedParams.cParams.minMatch);
2735 }
2736 return ZSTDbss_noCompress; /* don't even attempt compression below a certain srcSize */
2737 }
2738 ZSTD_resetSeqStore(&(zc->seqStore));
2739 /* required for optimal parser to read stats from dictionary */
2740 ms->opt.symbolCosts = &zc->blockState.prevCBlock->entropy;
2741 /* tell the optimal parser how we expect to compress literals */
2742 ms->opt.literalCompressionMode = zc->appliedParams.literalCompressionMode;
2743 /* a gap between an attached dict and the current window is not safe,
2744 * they must remain adjacent,
2745 * and when that stops being the case, the dict must be unset */
2746 assert(ms->dictMatchState == NULL || ms->loadedDictEnd == ms->window.dictLimit);
2747
2748 /* limited update after a very long match */
2749 { const BYTE* const base = ms->window.base;
2750 const BYTE* const istart = (const BYTE*)src;
2751 const U32 curr = (U32)(istart-base);
2752 if (sizeof(ptrdiff_t)==8) assert(istart - base < (ptrdiff_t)(U32)(-1)); /* ensure no overflow */
2753 if (curr > ms->nextToUpdate + 384)
2754 ms->nextToUpdate = curr - MIN(192, (U32)(curr - ms->nextToUpdate - 384));
2755 }
2756
2757 /* select and store sequences */
2758 { ZSTD_dictMode_e const dictMode = ZSTD_matchState_dictMode(ms);
2759 size_t lastLLSize;
2760 { int i;
2761 for (i = 0; i < ZSTD_REP_NUM; ++i)
2762 zc->blockState.nextCBlock->rep[i] = zc->blockState.prevCBlock->rep[i];
2763 }
2764 if (zc->externSeqStore.pos < zc->externSeqStore.size) {
2765 assert(zc->appliedParams.ldmParams.enableLdm == ZSTD_ps_disable);
2766 /* Updates ldmSeqStore.pos */
2767 lastLLSize =
2768 ZSTD_ldm_blockCompress(&zc->externSeqStore,
2769 ms, &zc->seqStore,
2770 zc->blockState.nextCBlock->rep,
2771 zc->appliedParams.useRowMatchFinder,
2772 src, srcSize);
2773 assert(zc->externSeqStore.pos <= zc->externSeqStore.size);
2774 } else if (zc->appliedParams.ldmParams.enableLdm == ZSTD_ps_enable) {
2775 rawSeqStore_t ldmSeqStore = kNullRawSeqStore;
2776
2777 ldmSeqStore.seq = zc->ldmSequences;
2778 ldmSeqStore.capacity = zc->maxNbLdmSequences;
2779 /* Updates ldmSeqStore.size */
2780 FORWARD_IF_ERROR(ZSTD_ldm_generateSequences(&zc->ldmState, &ldmSeqStore,
2781 &zc->appliedParams.ldmParams,
2782 src, srcSize), "");
2783 /* Updates ldmSeqStore.pos */
2784 lastLLSize =
2785 ZSTD_ldm_blockCompress(&ldmSeqStore,
2786 ms, &zc->seqStore,
2787 zc->blockState.nextCBlock->rep,
2788 zc->appliedParams.useRowMatchFinder,
2789 src, srcSize);
2790 assert(ldmSeqStore.pos == ldmSeqStore.size);
2791 } else { /* not long range mode */
2792 ZSTD_blockCompressor const blockCompressor = ZSTD_selectBlockCompressor(zc->appliedParams.cParams.strategy,
2793 zc->appliedParams.useRowMatchFinder,
2794 dictMode);
2795 ms->ldmSeqStore = NULL;
2796 lastLLSize = blockCompressor(ms, &zc->seqStore, zc->blockState.nextCBlock->rep, src, srcSize);
2797 }
2798 { const BYTE* const lastLiterals = (const BYTE*)src + srcSize - lastLLSize;
2799 ZSTD_storeLastLiterals(&zc->seqStore, lastLiterals, lastLLSize);
2800 } }
2801 return ZSTDbss_compress;
2802 }
2803
2804 static void ZSTD_copyBlockSequences(ZSTD_CCtx* zc)
2805 {
2806 const seqStore_t* seqStore = ZSTD_getSeqStore(zc);
2807 const seqDef* seqStoreSeqs = seqStore->sequencesStart;
2808 size_t seqStoreSeqSize = seqStore->sequences - seqStoreSeqs;
2809 size_t seqStoreLiteralsSize = (size_t)(seqStore->lit - seqStore->litStart);
2810 size_t literalsRead = 0;
2811 size_t lastLLSize;
2812
2813 ZSTD_Sequence* outSeqs = &zc->seqCollector.seqStart[zc->seqCollector.seqIndex];
2814 size_t i;
2815 repcodes_t updatedRepcodes;
2816
2817 assert(zc->seqCollector.seqIndex + 1 < zc->seqCollector.maxSequences);
2818 /* Ensure we have enough space for last literals "sequence" */
2819 assert(zc->seqCollector.maxSequences >= seqStoreSeqSize + 1);
2820 ZSTD_memcpy(updatedRepcodes.rep, zc->blockState.prevCBlock->rep, sizeof(repcodes_t));
2821 for (i = 0; i < seqStoreSeqSize; ++i) {
2822 U32 rawOffset = seqStoreSeqs[i].offBase - ZSTD_REP_NUM;
2823 outSeqs[i].litLength = seqStoreSeqs[i].litLength;
2824 outSeqs[i].matchLength = seqStoreSeqs[i].mlBase + MINMATCH;
2825 outSeqs[i].rep = 0;
2826
2827 if (i == seqStore->longLengthPos) {
2828 if (seqStore->longLengthType == ZSTD_llt_literalLength) {
2829 outSeqs[i].litLength += 0x10000;
2830 } else if (seqStore->longLengthType == ZSTD_llt_matchLength) {
2831 outSeqs[i].matchLength += 0x10000;
2832 }
2833 }
2834
2835 if (seqStoreSeqs[i].offBase <= ZSTD_REP_NUM) {
2836 /* Derive the correct offset corresponding to a repcode */
2837 outSeqs[i].rep = seqStoreSeqs[i].offBase;
2838 if (outSeqs[i].litLength != 0) {
2839 rawOffset = updatedRepcodes.rep[outSeqs[i].rep - 1];
2840 } else {
2841 if (outSeqs[i].rep == 3) {
2842 rawOffset = updatedRepcodes.rep[0] - 1;
2843 } else {
2844 rawOffset = updatedRepcodes.rep[outSeqs[i].rep];
2845 }
2846 }
2847 }
2848 outSeqs[i].offset = rawOffset;
2849 /* seqStoreSeqs[i].offset == offCode+1, and ZSTD_updateRep() expects offCode
2850 so we provide seqStoreSeqs[i].offset - 1 */
2851 ZSTD_updateRep(updatedRepcodes.rep,
2852 seqStoreSeqs[i].offBase - 1,
2853 seqStoreSeqs[i].litLength == 0);
2854 literalsRead += outSeqs[i].litLength;
2855 }
2856 /* Insert last literals (if any exist) in the block as a sequence with ml == off == 0.
2857 * If there are no last literals, then we'll emit (of: 0, ml: 0, ll: 0), which is a marker
2858 * for the block boundary, according to the API.
2859 */
2860 assert(seqStoreLiteralsSize >= literalsRead);
2861 lastLLSize = seqStoreLiteralsSize - literalsRead;
2862 outSeqs[i].litLength = (U32)lastLLSize;
2863 outSeqs[i].matchLength = outSeqs[i].offset = outSeqs[i].rep = 0;
2864 seqStoreSeqSize++;
2865 zc->seqCollector.seqIndex += seqStoreSeqSize;
2866 }
2867
2868 size_t ZSTD_generateSequences(ZSTD_CCtx* zc, ZSTD_Sequence* outSeqs,
2869 size_t outSeqsSize, const void* src, size_t srcSize)
2870 {
2871 const size_t dstCapacity = ZSTD_compressBound(srcSize);
2872 void* dst = ZSTD_customMalloc(dstCapacity, ZSTD_defaultCMem);
2873 SeqCollector seqCollector;
2874
2875 RETURN_ERROR_IF(dst == NULL, memory_allocation, "NULL pointer!");
2876
2877 seqCollector.collectSequences = 1;
2878 seqCollector.seqStart = outSeqs;
2879 seqCollector.seqIndex = 0;
2880 seqCollector.maxSequences = outSeqsSize;
2881 zc->seqCollector = seqCollector;
2882
2883 ZSTD_compress2(zc, dst, dstCapacity, src, srcSize);
2884 ZSTD_customFree(dst, ZSTD_defaultCMem);
2885 return zc->seqCollector.seqIndex;
2886 }
2887
2888 size_t ZSTD_mergeBlockDelimiters(ZSTD_Sequence* sequences, size_t seqsSize) {
2889 size_t in = 0;
2890 size_t out = 0;
2891 for (; in < seqsSize; ++in) {
2892 if (sequences[in].offset == 0 && sequences[in].matchLength == 0) {
2893 if (in != seqsSize - 1) {
2894 sequences[in+1].litLength += sequences[in].litLength;
2895 }
2896 } else {
2897 sequences[out] = sequences[in];
2898 ++out;
2899 }
2900 }
2901 return out;
2902 }
2903
2904 /* Unrolled loop to read four size_ts of input at a time. Returns 1 if is RLE, 0 if not. */
2905 static int ZSTD_isRLE(const BYTE* src, size_t length) {
2906 const BYTE* ip = src;
2907 const BYTE value = ip[0];
2908 const size_t valueST = (size_t)((U64)value * 0x0101010101010101ULL);
2909 const size_t unrollSize = sizeof(size_t) * 4;
2910 const size_t unrollMask = unrollSize - 1;
2911 const size_t prefixLength = length & unrollMask;
2912 size_t i;
2913 size_t u;
2914 if (length == 1) return 1;
2915 /* Check if prefix is RLE first before using unrolled loop */
2916 if (prefixLength && ZSTD_count(ip+1, ip, ip+prefixLength) != prefixLength-1) {
2917 return 0;
2918 }
2919 for (i = prefixLength; i != length; i += unrollSize) {
2920 for (u = 0; u < unrollSize; u += sizeof(size_t)) {
2921 if (MEM_readST(ip + i + u) != valueST) {
2922 return 0;
2923 }
2924 }
2925 }
2926 return 1;
2927 }
2928
2929 /* Returns true if the given block may be RLE.
2930 * This is just a heuristic based on the compressibility.
2931 * It may return both false positives and false negatives.
2932 */
2933 static int ZSTD_maybeRLE(seqStore_t const* seqStore)
2934 {
2935 size_t const nbSeqs = (size_t)(seqStore->sequences - seqStore->sequencesStart);
2936 size_t const nbLits = (size_t)(seqStore->lit - seqStore->litStart);
2937
2938 return nbSeqs < 4 && nbLits < 10;
2939 }
2940
2941 static void ZSTD_blockState_confirmRepcodesAndEntropyTables(ZSTD_blockState_t* const bs)
2942 {
2943 ZSTD_compressedBlockState_t* const tmp = bs->prevCBlock;
2944 bs->prevCBlock = bs->nextCBlock;
2945 bs->nextCBlock = tmp;
2946 }
2947
2948 /* Writes the block header */
2949 static void writeBlockHeader(void* op, size_t cSize, size_t blockSize, U32 lastBlock) {
2950 U32 const cBlockHeader = cSize == 1 ?
2951 lastBlock + (((U32)bt_rle)<<1) + (U32)(blockSize << 3) :
2952 lastBlock + (((U32)bt_compressed)<<1) + (U32)(cSize << 3);
2953 MEM_writeLE24(op, cBlockHeader);
2954 DEBUGLOG(3, "writeBlockHeader: cSize: %zu blockSize: %zu lastBlock: %u", cSize, blockSize, lastBlock);
2955 }
2956
2957 /* ZSTD_buildBlockEntropyStats_literals() :
2958 * Builds entropy for the literals.
2959 * Stores literals block type (raw, rle, compressed, repeat) and
2960 * huffman description table to hufMetadata.
2961 * Requires ENTROPY_WORKSPACE_SIZE workspace
2962 * @return : size of huffman description table or error code */
2963 static size_t ZSTD_buildBlockEntropyStats_literals(void* const src, size_t srcSize,
2964 const ZSTD_hufCTables_t* prevHuf,
2965 ZSTD_hufCTables_t* nextHuf,
2966 ZSTD_hufCTablesMetadata_t* hufMetadata,
2967 const int literalsCompressionIsDisabled,
2968 void* workspace, size_t wkspSize)
2969 {
2970 BYTE* const wkspStart = (BYTE*)workspace;
2971 BYTE* const wkspEnd = wkspStart + wkspSize;
2972 BYTE* const countWkspStart = wkspStart;
2973 unsigned* const countWksp = (unsigned*)workspace;
2974 const size_t countWkspSize = (HUF_SYMBOLVALUE_MAX + 1) * sizeof(unsigned);
2975 BYTE* const nodeWksp = countWkspStart + countWkspSize;
2976 const size_t nodeWkspSize = wkspEnd-nodeWksp;
2977 unsigned maxSymbolValue = HUF_SYMBOLVALUE_MAX;
2978 unsigned huffLog = HUF_TABLELOG_DEFAULT;
2979 HUF_repeat repeat = prevHuf->repeatMode;
2980 DEBUGLOG(5, "ZSTD_buildBlockEntropyStats_literals (srcSize=%zu)", srcSize);
2981
2982 /* Prepare nextEntropy assuming reusing the existing table */
2983 ZSTD_memcpy(nextHuf, prevHuf, sizeof(*prevHuf));
2984
2985 if (literalsCompressionIsDisabled) {
2986 DEBUGLOG(5, "set_basic - disabled");
2987 hufMetadata->hType = set_basic;
2988 return 0;
2989 }
2990
2991 /* small ? don't even attempt compression (speed opt) */
2992 #ifndef COMPRESS_LITERALS_SIZE_MIN
2993 #define COMPRESS_LITERALS_SIZE_MIN 63
2994 #endif
2995 { size_t const minLitSize = (prevHuf->repeatMode == HUF_repeat_valid) ? 6 : COMPRESS_LITERALS_SIZE_MIN;
2996 if (srcSize <= minLitSize) {
2997 DEBUGLOG(5, "set_basic - too small");
2998 hufMetadata->hType = set_basic;
2999 return 0;
3000 }
3001 }
3002
3003 /* Scan input and build symbol stats */
3004 { size_t const largest = HIST_count_wksp (countWksp, &maxSymbolValue, (const BYTE*)src, srcSize, workspace, wkspSize);
3005 FORWARD_IF_ERROR(largest, "HIST_count_wksp failed");
3006 if (largest == srcSize) {
3007 DEBUGLOG(5, "set_rle");
3008 hufMetadata->hType = set_rle;
3009 return 0;
3010 }
3011 if (largest <= (srcSize >> 7)+4) {
3012 DEBUGLOG(5, "set_basic - no gain");
3013 hufMetadata->hType = set_basic;
3014 return 0;
3015 }
3016 }
3017
3018 /* Validate the previous Huffman table */
3019 if (repeat == HUF_repeat_check && !HUF_validateCTable((HUF_CElt const*)prevHuf->CTable, countWksp, maxSymbolValue)) {
3020 repeat = HUF_repeat_none;
3021 }
3022
3023 /* Build Huffman Tree */
3024 ZSTD_memset(nextHuf->CTable, 0, sizeof(nextHuf->CTable));
3025 huffLog = HUF_optimalTableLog(huffLog, srcSize, maxSymbolValue);
3026 { size_t const maxBits = HUF_buildCTable_wksp((HUF_CElt*)nextHuf->CTable, countWksp,
3027 maxSymbolValue, huffLog,
3028 nodeWksp, nodeWkspSize);
3029 FORWARD_IF_ERROR(maxBits, "HUF_buildCTable_wksp");
3030 huffLog = (U32)maxBits;
3031 { /* Build and write the CTable */
3032 size_t const newCSize = HUF_estimateCompressedSize(
3033 (HUF_CElt*)nextHuf->CTable, countWksp, maxSymbolValue);
3034 size_t const hSize = HUF_writeCTable_wksp(
3035 hufMetadata->hufDesBuffer, sizeof(hufMetadata->hufDesBuffer),
3036 (HUF_CElt*)nextHuf->CTable, maxSymbolValue, huffLog,
3037 nodeWksp, nodeWkspSize);
3038 /* Check against repeating the previous CTable */
3039 if (repeat != HUF_repeat_none) {
3040 size_t const oldCSize = HUF_estimateCompressedSize(
3041 (HUF_CElt const*)prevHuf->CTable, countWksp, maxSymbolValue);
3042 if (oldCSize < srcSize && (oldCSize <= hSize + newCSize || hSize + 12 >= srcSize)) {
3043 DEBUGLOG(5, "set_repeat - smaller");
3044 ZSTD_memcpy(nextHuf, prevHuf, sizeof(*prevHuf));
3045 hufMetadata->hType = set_repeat;
3046 return 0;
3047 }
3048 }
3049 if (newCSize + hSize >= srcSize) {
3050 DEBUGLOG(5, "set_basic - no gains");
3051 ZSTD_memcpy(nextHuf, prevHuf, sizeof(*prevHuf));
3052 hufMetadata->hType = set_basic;
3053 return 0;
3054 }
3055 DEBUGLOG(5, "set_compressed (hSize=%u)", (U32)hSize);
3056 hufMetadata->hType = set_compressed;
3057 nextHuf->repeatMode = HUF_repeat_check;
3058 return hSize;
3059 }
3060 }
3061 }
3062
3063
3064 /* ZSTD_buildDummySequencesStatistics():
3065 * Returns a ZSTD_symbolEncodingTypeStats_t with all encoding types as set_basic,
3066 * and updates nextEntropy to the appropriate repeatMode.
3067 */
3068 static ZSTD_symbolEncodingTypeStats_t
3069 ZSTD_buildDummySequencesStatistics(ZSTD_fseCTables_t* nextEntropy) {
3070 ZSTD_symbolEncodingTypeStats_t stats = {set_basic, set_basic, set_basic, 0, 0};
3071 nextEntropy->litlength_repeatMode = FSE_repeat_none;
3072 nextEntropy->offcode_repeatMode = FSE_repeat_none;
3073 nextEntropy->matchlength_repeatMode = FSE_repeat_none;
3074 return stats;
3075 }
3076
3077 /* ZSTD_buildBlockEntropyStats_sequences() :
3078 * Builds entropy for the sequences.
3079 * Stores symbol compression modes and fse table to fseMetadata.
3080 * Requires ENTROPY_WORKSPACE_SIZE wksp.
3081 * @return : size of fse tables or error code */
3082 static size_t ZSTD_buildBlockEntropyStats_sequences(seqStore_t* seqStorePtr,
3083 const ZSTD_fseCTables_t* prevEntropy,
3084 ZSTD_fseCTables_t* nextEntropy,
3085 const ZSTD_CCtx_params* cctxParams,
3086 ZSTD_fseCTablesMetadata_t* fseMetadata,
3087 void* workspace, size_t wkspSize)
3088 {
3089 ZSTD_strategy const strategy = cctxParams->cParams.strategy;
3090 size_t const nbSeq = seqStorePtr->sequences - seqStorePtr->sequencesStart;
3091 BYTE* const ostart = fseMetadata->fseTablesBuffer;
3092 BYTE* const oend = ostart + sizeof(fseMetadata->fseTablesBuffer);
3093 BYTE* op = ostart;
3094 unsigned* countWorkspace = (unsigned*)workspace;
3095 unsigned* entropyWorkspace = countWorkspace + (MaxSeq + 1);
3096 size_t entropyWorkspaceSize = wkspSize - (MaxSeq + 1) * sizeof(*countWorkspace);
3097 ZSTD_symbolEncodingTypeStats_t stats;
3098
3099 DEBUGLOG(5, "ZSTD_buildBlockEntropyStats_sequences (nbSeq=%zu)", nbSeq);
3100 stats = nbSeq != 0 ? ZSTD_buildSequencesStatistics(seqStorePtr, nbSeq,
3101 prevEntropy, nextEntropy, op, oend,
3102 strategy, countWorkspace,
3103 entropyWorkspace, entropyWorkspaceSize)
3104 : ZSTD_buildDummySequencesStatistics(nextEntropy);
3105 FORWARD_IF_ERROR(stats.size, "ZSTD_buildSequencesStatistics failed!");
3106 fseMetadata->llType = (symbolEncodingType_e) stats.LLtype;
3107 fseMetadata->ofType = (symbolEncodingType_e) stats.Offtype;
3108 fseMetadata->mlType = (symbolEncodingType_e) stats.MLtype;
3109 fseMetadata->lastCountSize = stats.lastCountSize;
3110 return stats.size;
3111 }
3112
3113
3114 /* ZSTD_buildBlockEntropyStats() :
3115 * Builds entropy for the block.
3116 * Requires workspace size ENTROPY_WORKSPACE_SIZE
3117 *
3118 * @return : 0 on success or error code
3119 */
3120 size_t ZSTD_buildBlockEntropyStats(seqStore_t* seqStorePtr,
3121 const ZSTD_entropyCTables_t* prevEntropy,
3122 ZSTD_entropyCTables_t* nextEntropy,
3123 const ZSTD_CCtx_params* cctxParams,
3124 ZSTD_entropyCTablesMetadata_t* entropyMetadata,
3125 void* workspace, size_t wkspSize)
3126 {
3127 size_t const litSize = seqStorePtr->lit - seqStorePtr->litStart;
3128 entropyMetadata->hufMetadata.hufDesSize =
3129 ZSTD_buildBlockEntropyStats_literals(seqStorePtr->litStart, litSize,
3130 &prevEntropy->huf, &nextEntropy->huf,
3131 &entropyMetadata->hufMetadata,
3132 ZSTD_literalsCompressionIsDisabled(cctxParams),
3133 workspace, wkspSize);
3134 FORWARD_IF_ERROR(entropyMetadata->hufMetadata.hufDesSize, "ZSTD_buildBlockEntropyStats_literals failed");
3135 entropyMetadata->fseMetadata.fseTablesSize =
3136 ZSTD_buildBlockEntropyStats_sequences(seqStorePtr,
3137 &prevEntropy->fse, &nextEntropy->fse,
3138 cctxParams,
3139 &entropyMetadata->fseMetadata,
3140 workspace, wkspSize);
3141 FORWARD_IF_ERROR(entropyMetadata->fseMetadata.fseTablesSize, "ZSTD_buildBlockEntropyStats_sequences failed");
3142 return 0;
3143 }
3144
3145 /* Returns the size estimate for the literals section (header + content) of a block */
3146 static size_t ZSTD_estimateBlockSize_literal(const BYTE* literals, size_t litSize,
3147 const ZSTD_hufCTables_t* huf,
3148 const ZSTD_hufCTablesMetadata_t* hufMetadata,
3149 void* workspace, size_t wkspSize,
3150 int writeEntropy)
3151 {
3152 unsigned* const countWksp = (unsigned*)workspace;
3153 unsigned maxSymbolValue = HUF_SYMBOLVALUE_MAX;
3154 size_t literalSectionHeaderSize = 3 + (litSize >= 1 KB) + (litSize >= 16 KB);
3155 U32 singleStream = litSize < 256;
3156
3157 if (hufMetadata->hType == set_basic) return litSize;
3158 else if (hufMetadata->hType == set_rle) return 1;
3159 else if (hufMetadata->hType == set_compressed || hufMetadata->hType == set_repeat) {
3160 size_t const largest = HIST_count_wksp (countWksp, &maxSymbolValue, (const BYTE*)literals, litSize, workspace, wkspSize);
3161 if (ZSTD_isError(largest)) return litSize;
3162 { size_t cLitSizeEstimate = HUF_estimateCompressedSize((const HUF_CElt*)huf->CTable, countWksp, maxSymbolValue);
3163 if (writeEntropy) cLitSizeEstimate += hufMetadata->hufDesSize;
3164 if (!singleStream) cLitSizeEstimate += 6; /* multi-stream huffman uses 6-byte jump table */
3165 return cLitSizeEstimate + literalSectionHeaderSize;
3166 } }
3167 assert(0); /* impossible */
3168 return 0;
3169 }
3170
3171 /* Returns the size estimate for the FSE-compressed symbols (of, ml, ll) of a block */
3172 static size_t ZSTD_estimateBlockSize_symbolType(symbolEncodingType_e type,
3173 const BYTE* codeTable, size_t nbSeq, unsigned maxCode,
3174 const FSE_CTable* fseCTable,
3175 const U8* additionalBits,
3176 short const* defaultNorm, U32 defaultNormLog, U32 defaultMax,
3177 void* workspace, size_t wkspSize)
3178 {
3179 unsigned* const countWksp = (unsigned*)workspace;
3180 const BYTE* ctp = codeTable;
3181 const BYTE* const ctStart = ctp;
3182 const BYTE* const ctEnd = ctStart + nbSeq;
3183 size_t cSymbolTypeSizeEstimateInBits = 0;
3184 unsigned max = maxCode;
3185
3186 HIST_countFast_wksp(countWksp, &max, codeTable, nbSeq, workspace, wkspSize); /* can't fail */
3187 if (type == set_basic) {
3188 /* We selected this encoding type, so it must be valid. */
3189 assert(max <= defaultMax);
3190 (void)defaultMax;
3191 cSymbolTypeSizeEstimateInBits = ZSTD_crossEntropyCost(defaultNorm, defaultNormLog, countWksp, max);
3192 } else if (type == set_rle) {
3193 cSymbolTypeSizeEstimateInBits = 0;
3194 } else if (type == set_compressed || type == set_repeat) {
3195 cSymbolTypeSizeEstimateInBits = ZSTD_fseBitCost(fseCTable, countWksp, max);
3196 }
3197 if (ZSTD_isError(cSymbolTypeSizeEstimateInBits)) {
3198 return nbSeq * 10;
3199 }
3200 while (ctp < ctEnd) {
3201 if (additionalBits) cSymbolTypeSizeEstimateInBits += additionalBits[*ctp];
3202 else cSymbolTypeSizeEstimateInBits += *ctp; /* for offset, offset code is also the number of additional bits */
3203 ctp++;
3204 }
3205 return cSymbolTypeSizeEstimateInBits >> 3;
3206 }
3207
3208 /* Returns the size estimate for the sequences section (header + content) of a block */
3209 static size_t ZSTD_estimateBlockSize_sequences(const BYTE* ofCodeTable,
3210 const BYTE* llCodeTable,
3211 const BYTE* mlCodeTable,
3212 size_t nbSeq,
3213 const ZSTD_fseCTables_t* fseTables,
3214 const ZSTD_fseCTablesMetadata_t* fseMetadata,
3215 void* workspace, size_t wkspSize,
3216 int writeEntropy)
3217 {
3218 size_t sequencesSectionHeaderSize = 1 /* seqHead */ + 1 /* min seqSize size */ + (nbSeq >= 128) + (nbSeq >= LONGNBSEQ);
3219 size_t cSeqSizeEstimate = 0;
3220 cSeqSizeEstimate += ZSTD_estimateBlockSize_symbolType(fseMetadata->ofType, ofCodeTable, nbSeq, MaxOff,
3221 fseTables->offcodeCTable, NULL,
3222 OF_defaultNorm, OF_defaultNormLog, DefaultMaxOff,
3223 workspace, wkspSize);
3224 cSeqSizeEstimate += ZSTD_estimateBlockSize_symbolType(fseMetadata->llType, llCodeTable, nbSeq, MaxLL,
3225 fseTables->litlengthCTable, LL_bits,
3226 LL_defaultNorm, LL_defaultNormLog, MaxLL,
3227 workspace, wkspSize);
3228 cSeqSizeEstimate += ZSTD_estimateBlockSize_symbolType(fseMetadata->mlType, mlCodeTable, nbSeq, MaxML,
3229 fseTables->matchlengthCTable, ML_bits,
3230 ML_defaultNorm, ML_defaultNormLog, MaxML,
3231 workspace, wkspSize);
3232 if (writeEntropy) cSeqSizeEstimate += fseMetadata->fseTablesSize;
3233 return cSeqSizeEstimate + sequencesSectionHeaderSize;
3234 }
3235
3236 /* Returns the size estimate for a given stream of literals, of, ll, ml */
3237 static size_t ZSTD_estimateBlockSize(const BYTE* literals, size_t litSize,
3238 const BYTE* ofCodeTable,
3239 const BYTE* llCodeTable,
3240 const BYTE* mlCodeTable,
3241 size_t nbSeq,
3242 const ZSTD_entropyCTables_t* entropy,
3243 const ZSTD_entropyCTablesMetadata_t* entropyMetadata,
3244 void* workspace, size_t wkspSize,
3245 int writeLitEntropy, int writeSeqEntropy) {
3246 size_t const literalsSize = ZSTD_estimateBlockSize_literal(literals, litSize,
3247 &entropy->huf, &entropyMetadata->hufMetadata,
3248 workspace, wkspSize, writeLitEntropy);
3249 size_t const seqSize = ZSTD_estimateBlockSize_sequences(ofCodeTable, llCodeTable, mlCodeTable,
3250 nbSeq, &entropy->fse, &entropyMetadata->fseMetadata,
3251 workspace, wkspSize, writeSeqEntropy);
3252 return seqSize + literalsSize + ZSTD_blockHeaderSize;
3253 }
3254
3255 /* Builds entropy statistics and uses them for blocksize estimation.
3256 *
3257 * Returns the estimated compressed size of the seqStore, or a zstd error.
3258 */
3259 static size_t ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize(seqStore_t* seqStore, ZSTD_CCtx* zc) {
3260 ZSTD_entropyCTablesMetadata_t* entropyMetadata = &zc->blockSplitCtx.entropyMetadata;
3261 DEBUGLOG(6, "ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize()");
3262 FORWARD_IF_ERROR(ZSTD_buildBlockEntropyStats(seqStore,
3263 &zc->blockState.prevCBlock->entropy,
3264 &zc->blockState.nextCBlock->entropy,
3265 &zc->appliedParams,
3266 entropyMetadata,
3267 zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE /* statically allocated in resetCCtx */), "");
3268 return ZSTD_estimateBlockSize(seqStore->litStart, (size_t)(seqStore->lit - seqStore->litStart),
3269 seqStore->ofCode, seqStore->llCode, seqStore->mlCode,
3270 (size_t)(seqStore->sequences - seqStore->sequencesStart),
3271 &zc->blockState.nextCBlock->entropy, entropyMetadata, zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE,
3272 (int)(entropyMetadata->hufMetadata.hType == set_compressed), 1);
3273 }
3274
3275 /* Returns literals bytes represented in a seqStore */
3276 static size_t ZSTD_countSeqStoreLiteralsBytes(const seqStore_t* const seqStore) {
3277 size_t literalsBytes = 0;
3278 size_t const nbSeqs = seqStore->sequences - seqStore->sequencesStart;
3279 size_t i;
3280 for (i = 0; i < nbSeqs; ++i) {
3281 seqDef seq = seqStore->sequencesStart[i];
3282 literalsBytes += seq.litLength;
3283 if (i == seqStore->longLengthPos && seqStore->longLengthType == ZSTD_llt_literalLength) {
3284 literalsBytes += 0x10000;
3285 }
3286 }
3287 return literalsBytes;
3288 }
3289
3290 /* Returns match bytes represented in a seqStore */
3291 static size_t ZSTD_countSeqStoreMatchBytes(const seqStore_t* const seqStore) {
3292 size_t matchBytes = 0;
3293 size_t const nbSeqs = seqStore->sequences - seqStore->sequencesStart;
3294 size_t i;
3295 for (i = 0; i < nbSeqs; ++i) {
3296 seqDef seq = seqStore->sequencesStart[i];
3297 matchBytes += seq.mlBase + MINMATCH;
3298 if (i == seqStore->longLengthPos && seqStore->longLengthType == ZSTD_llt_matchLength) {
3299 matchBytes += 0x10000;
3300 }
3301 }
3302 return matchBytes;
3303 }
3304
3305 /* Derives the seqStore that is a chunk of the originalSeqStore from [startIdx, endIdx).
3306 * Stores the result in resultSeqStore.
3307 */
3308 static void ZSTD_deriveSeqStoreChunk(seqStore_t* resultSeqStore,
3309 const seqStore_t* originalSeqStore,
3310 size_t startIdx, size_t endIdx) {
3311 BYTE* const litEnd = originalSeqStore->lit;
3312 size_t literalsBytes;
3313 size_t literalsBytesPreceding = 0;
3314
3315 *resultSeqStore = *originalSeqStore;
3316 if (startIdx > 0) {
3317 resultSeqStore->sequences = originalSeqStore->sequencesStart + startIdx;
3318 literalsBytesPreceding = ZSTD_countSeqStoreLiteralsBytes(resultSeqStore);
3319 }
3320
3321 /* Move longLengthPos into the correct position if necessary */
3322 if (originalSeqStore->longLengthType != ZSTD_llt_none) {
3323 if (originalSeqStore->longLengthPos < startIdx || originalSeqStore->longLengthPos > endIdx) {
3324 resultSeqStore->longLengthType = ZSTD_llt_none;
3325 } else {
3326 resultSeqStore->longLengthPos -= (U32)startIdx;
3327 }
3328 }
3329 resultSeqStore->sequencesStart = originalSeqStore->sequencesStart + startIdx;
3330 resultSeqStore->sequences = originalSeqStore->sequencesStart + endIdx;
3331 literalsBytes = ZSTD_countSeqStoreLiteralsBytes(resultSeqStore);
3332 resultSeqStore->litStart += literalsBytesPreceding;
3333 if (endIdx == (size_t)(originalSeqStore->sequences - originalSeqStore->sequencesStart)) {
3334 /* This accounts for possible last literals if the derived chunk reaches the end of the block */
3335 resultSeqStore->lit = litEnd;
3336 } else {
3337 resultSeqStore->lit = resultSeqStore->litStart+literalsBytes;
3338 }
3339 resultSeqStore->llCode += startIdx;
3340 resultSeqStore->mlCode += startIdx;
3341 resultSeqStore->ofCode += startIdx;
3342 }
3343
3344 /*
3345 * Returns the raw offset represented by the combination of offCode, ll0, and repcode history.
3346 * offCode must represent a repcode in the numeric representation of ZSTD_storeSeq().
3347 */
3348 static U32
3349 ZSTD_resolveRepcodeToRawOffset(const U32 rep[ZSTD_REP_NUM], const U32 offCode, const U32 ll0)
3350 {
3351 U32 const adjustedOffCode = STORED_REPCODE(offCode) - 1 + ll0; /* [ 0 - 3 ] */
3352 assert(STORED_IS_REPCODE(offCode));
3353 if (adjustedOffCode == ZSTD_REP_NUM) {
3354 /* litlength == 0 and offCode == 2 implies selection of first repcode - 1 */
3355 assert(rep[0] > 0);
3356 return rep[0] - 1;
3357 }
3358 return rep[adjustedOffCode];
3359 }
3360
3361 /*
3362 * ZSTD_seqStore_resolveOffCodes() reconciles any possible divergences in offset history that may arise
3363 * due to emission of RLE/raw blocks that disturb the offset history,
3364 * and replaces any repcodes within the seqStore that may be invalid.
3365 *
3366 * dRepcodes are updated as would be on the decompression side.
3367 * cRepcodes are updated exactly in accordance with the seqStore.
3368 *
3369 * Note : this function assumes seq->offBase respects the following numbering scheme :
3370 * 0 : invalid
3371 * 1-3 : repcode 1-3
3372 * 4+ : real_offset+3
3373 */
3374 static void ZSTD_seqStore_resolveOffCodes(repcodes_t* const dRepcodes, repcodes_t* const cRepcodes,
3375 seqStore_t* const seqStore, U32 const nbSeq) {
3376 U32 idx = 0;
3377 for (; idx < nbSeq; ++idx) {
3378 seqDef* const seq = seqStore->sequencesStart + idx;
3379 U32 const ll0 = (seq->litLength == 0);
3380 U32 const offCode = OFFBASE_TO_STORED(seq->offBase);
3381 assert(seq->offBase > 0);
3382 if (STORED_IS_REPCODE(offCode)) {
3383 U32 const dRawOffset = ZSTD_resolveRepcodeToRawOffset(dRepcodes->rep, offCode, ll0);
3384 U32 const cRawOffset = ZSTD_resolveRepcodeToRawOffset(cRepcodes->rep, offCode, ll0);
3385 /* Adjust simulated decompression repcode history if we come across a mismatch. Replace
3386 * the repcode with the offset it actually references, determined by the compression
3387 * repcode history.
3388 */
3389 if (dRawOffset != cRawOffset) {
3390 seq->offBase = cRawOffset + ZSTD_REP_NUM;
3391 }
3392 }
3393 /* Compression repcode history is always updated with values directly from the unmodified seqStore.
3394 * Decompression repcode history may use modified seq->offset value taken from compression repcode history.
3395 */
3396 ZSTD_updateRep(dRepcodes->rep, OFFBASE_TO_STORED(seq->offBase), ll0);
3397 ZSTD_updateRep(cRepcodes->rep, offCode, ll0);
3398 }
3399 }
3400
3401 /* ZSTD_compressSeqStore_singleBlock():
3402 * Compresses a seqStore into a block with a block header, into the buffer dst.
3403 *
3404 * Returns the total size of that block (including header) or a ZSTD error code.
3405 */
3406 static size_t
3407 ZSTD_compressSeqStore_singleBlock(ZSTD_CCtx* zc, seqStore_t* const seqStore,
3408 repcodes_t* const dRep, repcodes_t* const cRep,
3409 void* dst, size_t dstCapacity,
3410 const void* src, size_t srcSize,
3411 U32 lastBlock, U32 isPartition)
3412 {
3413 const U32 rleMaxLength = 25;
3414 BYTE* op = (BYTE*)dst;
3415 const BYTE* ip = (const BYTE*)src;
3416 size_t cSize;
3417 size_t cSeqsSize;
3418
3419 /* In case of an RLE or raw block, the simulated decompression repcode history must be reset */
3420 repcodes_t const dRepOriginal = *dRep;
3421 DEBUGLOG(5, "ZSTD_compressSeqStore_singleBlock");
3422 if (isPartition)
3423 ZSTD_seqStore_resolveOffCodes(dRep, cRep, seqStore, (U32)(seqStore->sequences - seqStore->sequencesStart));
3424
3425 RETURN_ERROR_IF(dstCapacity < ZSTD_blockHeaderSize, dstSize_tooSmall, "Block header doesn't fit");
3426 cSeqsSize = ZSTD_entropyCompressSeqStore(seqStore,
3427 &zc->blockState.prevCBlock->entropy, &zc->blockState.nextCBlock->entropy,
3428 &zc->appliedParams,
3429 op + ZSTD_blockHeaderSize, dstCapacity - ZSTD_blockHeaderSize,
3430 srcSize,
3431 zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE /* statically allocated in resetCCtx */,
3432 zc->bmi2);
3433 FORWARD_IF_ERROR(cSeqsSize, "ZSTD_entropyCompressSeqStore failed!");
3434
3435 if (!zc->isFirstBlock &&
3436 cSeqsSize < rleMaxLength &&
3437 ZSTD_isRLE((BYTE const*)src, srcSize)) {
3438 /* We don't want to emit our first block as a RLE even if it qualifies because
3439 * doing so will cause the decoder (cli only) to throw a "should consume all input error."
3440 * This is only an issue for zstd <= v1.4.3
3441 */
3442 cSeqsSize = 1;
3443 }
3444
3445 if (zc->seqCollector.collectSequences) {
3446 ZSTD_copyBlockSequences(zc);
3447 ZSTD_blockState_confirmRepcodesAndEntropyTables(&zc->blockState);
3448 return 0;
3449 }
3450
3451 if (cSeqsSize == 0) {
3452 cSize = ZSTD_noCompressBlock(op, dstCapacity, ip, srcSize, lastBlock);
3453 FORWARD_IF_ERROR(cSize, "Nocompress block failed");
3454 DEBUGLOG(4, "Writing out nocompress block, size: %zu", cSize);
3455 *dRep = dRepOriginal; /* reset simulated decompression repcode history */
3456 } else if (cSeqsSize == 1) {
3457 cSize = ZSTD_rleCompressBlock(op, dstCapacity, *ip, srcSize, lastBlock);
3458 FORWARD_IF_ERROR(cSize, "RLE compress block failed");
3459 DEBUGLOG(4, "Writing out RLE block, size: %zu", cSize);
3460 *dRep = dRepOriginal; /* reset simulated decompression repcode history */
3461 } else {
3462 ZSTD_blockState_confirmRepcodesAndEntropyTables(&zc->blockState);
3463 writeBlockHeader(op, cSeqsSize, srcSize, lastBlock);
3464 cSize = ZSTD_blockHeaderSize + cSeqsSize;
3465 DEBUGLOG(4, "Writing out compressed block, size: %zu", cSize);
3466 }
3467
3468 if (zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid)
3469 zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check;
3470
3471 return cSize;
3472 }
3473
3474 /* Struct to keep track of where we are in our recursive calls. */
3475 typedef struct {
3476 U32* splitLocations; /* Array of split indices */
3477 size_t idx; /* The current index within splitLocations being worked on */
3478 } seqStoreSplits;
3479
3480 #define MIN_SEQUENCES_BLOCK_SPLITTING 300
3481
3482 /* Helper function to perform the recursive search for block splits.
3483 * Estimates the cost of seqStore prior to split, and estimates the cost of splitting the sequences in half.
3484 * If advantageous to split, then we recurse down the two sub-blocks. If not, or if an error occurred in estimation, then
3485 * we do not recurse.
3486 *
3487 * Note: The recursion depth is capped by a heuristic minimum number of sequences, defined by MIN_SEQUENCES_BLOCK_SPLITTING.
3488 * In theory, this means the absolute largest recursion depth is 10 == log2(maxNbSeqInBlock/MIN_SEQUENCES_BLOCK_SPLITTING).
3489 * In practice, recursion depth usually doesn't go beyond 4.
3490 *
3491 * Furthermore, the number of splits is capped by ZSTD_MAX_NB_BLOCK_SPLITS. At ZSTD_MAX_NB_BLOCK_SPLITS == 196 with the current existing blockSize
3492 * maximum of 128 KB, this value is actually impossible to reach.
3493 */
3494 static void
3495 ZSTD_deriveBlockSplitsHelper(seqStoreSplits* splits, size_t startIdx, size_t endIdx,
3496 ZSTD_CCtx* zc, const seqStore_t* origSeqStore)
3497 {
3498 seqStore_t* fullSeqStoreChunk = &zc->blockSplitCtx.fullSeqStoreChunk;
3499 seqStore_t* firstHalfSeqStore = &zc->blockSplitCtx.firstHalfSeqStore;
3500 seqStore_t* secondHalfSeqStore = &zc->blockSplitCtx.secondHalfSeqStore;
3501 size_t estimatedOriginalSize;
3502 size_t estimatedFirstHalfSize;
3503 size_t estimatedSecondHalfSize;
3504 size_t midIdx = (startIdx + endIdx)/2;
3505
3506 if (endIdx - startIdx < MIN_SEQUENCES_BLOCK_SPLITTING || splits->idx >= ZSTD_MAX_NB_BLOCK_SPLITS) {
3507 DEBUGLOG(6, "ZSTD_deriveBlockSplitsHelper: Too few sequences");
3508 return;
3509 }
3510 DEBUGLOG(4, "ZSTD_deriveBlockSplitsHelper: startIdx=%zu endIdx=%zu", startIdx, endIdx);
3511 ZSTD_deriveSeqStoreChunk(fullSeqStoreChunk, origSeqStore, startIdx, endIdx);
3512 ZSTD_deriveSeqStoreChunk(firstHalfSeqStore, origSeqStore, startIdx, midIdx);
3513 ZSTD_deriveSeqStoreChunk(secondHalfSeqStore, origSeqStore, midIdx, endIdx);
3514 estimatedOriginalSize = ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize(fullSeqStoreChunk, zc);
3515 estimatedFirstHalfSize = ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize(firstHalfSeqStore, zc);
3516 estimatedSecondHalfSize = ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize(secondHalfSeqStore, zc);
3517 DEBUGLOG(4, "Estimated original block size: %zu -- First half split: %zu -- Second half split: %zu",
3518 estimatedOriginalSize, estimatedFirstHalfSize, estimatedSecondHalfSize);
3519 if (ZSTD_isError(estimatedOriginalSize) || ZSTD_isError(estimatedFirstHalfSize) || ZSTD_isError(estimatedSecondHalfSize)) {
3520 return;
3521 }
3522 if (estimatedFirstHalfSize + estimatedSecondHalfSize < estimatedOriginalSize) {
3523 ZSTD_deriveBlockSplitsHelper(splits, startIdx, midIdx, zc, origSeqStore);
3524 splits->splitLocations[splits->idx] = (U32)midIdx;
3525 splits->idx++;
3526 ZSTD_deriveBlockSplitsHelper(splits, midIdx, endIdx, zc, origSeqStore);
3527 }
3528 }
3529
3530 /* Base recursive function. Populates a table with intra-block partition indices that can improve compression ratio.
3531 *
3532 * Returns the number of splits made (which equals the size of the partition table - 1).
3533 */
3534 static size_t ZSTD_deriveBlockSplits(ZSTD_CCtx* zc, U32 partitions[], U32 nbSeq) {
3535 seqStoreSplits splits = {partitions, 0};
3536 if (nbSeq <= 4) {
3537 DEBUGLOG(4, "ZSTD_deriveBlockSplits: Too few sequences to split");
3538 /* Refuse to try and split anything with less than 4 sequences */
3539 return 0;
3540 }
3541 ZSTD_deriveBlockSplitsHelper(&splits, 0, nbSeq, zc, &zc->seqStore);
3542 splits.splitLocations[splits.idx] = nbSeq;
3543 DEBUGLOG(5, "ZSTD_deriveBlockSplits: final nb partitions: %zu", splits.idx+1);
3544 return splits.idx;
3545 }
3546
3547 /* ZSTD_compressBlock_splitBlock():
3548 * Attempts to split a given block into multiple blocks to improve compression ratio.
3549 *
3550 * Returns combined size of all blocks (which includes headers), or a ZSTD error code.
3551 */
3552 static size_t
3553 ZSTD_compressBlock_splitBlock_internal(ZSTD_CCtx* zc, void* dst, size_t dstCapacity,
3554 const void* src, size_t blockSize, U32 lastBlock, U32 nbSeq)
3555 {
3556 size_t cSize = 0;
3557 const BYTE* ip = (const BYTE*)src;
3558 BYTE* op = (BYTE*)dst;
3559 size_t i = 0;
3560 size_t srcBytesTotal = 0;
3561 U32* partitions = zc->blockSplitCtx.partitions; /* size == ZSTD_MAX_NB_BLOCK_SPLITS */
3562 seqStore_t* nextSeqStore = &zc->blockSplitCtx.nextSeqStore;
3563 seqStore_t* currSeqStore = &zc->blockSplitCtx.currSeqStore;
3564 size_t numSplits = ZSTD_deriveBlockSplits(zc, partitions, nbSeq);
3565
3566 /* If a block is split and some partitions are emitted as RLE/uncompressed, then repcode history
3567 * may become invalid. In order to reconcile potentially invalid repcodes, we keep track of two
3568 * separate repcode histories that simulate repcode history on compression and decompression side,
3569 * and use the histories to determine whether we must replace a particular repcode with its raw offset.
3570 *
3571 * 1) cRep gets updated for each partition, regardless of whether the block was emitted as uncompressed
3572 * or RLE. This allows us to retrieve the offset value that an invalid repcode references within
3573 * a nocompress/RLE block.
3574 * 2) dRep gets updated only for compressed partitions, and when a repcode gets replaced, will use
3575 * the replacement offset value rather than the original repcode to update the repcode history.
3576 * dRep also will be the final repcode history sent to the next block.
3577 *
3578 * See ZSTD_seqStore_resolveOffCodes() for more details.
3579 */
3580 repcodes_t dRep;
3581 repcodes_t cRep;
3582 ZSTD_memcpy(dRep.rep, zc->blockState.prevCBlock->rep, sizeof(repcodes_t));
3583 ZSTD_memcpy(cRep.rep, zc->blockState.prevCBlock->rep, sizeof(repcodes_t));
3584 ZSTD_memset(nextSeqStore, 0, sizeof(seqStore_t));
3585
3586 DEBUGLOG(4, "ZSTD_compressBlock_splitBlock_internal (dstCapacity=%u, dictLimit=%u, nextToUpdate=%u)",
3587 (unsigned)dstCapacity, (unsigned)zc->blockState.matchState.window.dictLimit,
3588 (unsigned)zc->blockState.matchState.nextToUpdate);
3589
3590 if (numSplits == 0) {
3591 size_t cSizeSingleBlock = ZSTD_compressSeqStore_singleBlock(zc, &zc->seqStore,
3592 &dRep, &cRep,
3593 op, dstCapacity,
3594 ip, blockSize,
3595 lastBlock, 0 /* isPartition */);
3596 FORWARD_IF_ERROR(cSizeSingleBlock, "Compressing single block from splitBlock_internal() failed!");
3597 DEBUGLOG(5, "ZSTD_compressBlock_splitBlock_internal: No splits");
3598 assert(cSizeSingleBlock <= ZSTD_BLOCKSIZE_MAX + ZSTD_blockHeaderSize);
3599 return cSizeSingleBlock;
3600 }
3601
3602 ZSTD_deriveSeqStoreChunk(currSeqStore, &zc->seqStore, 0, partitions[0]);
3603 for (i = 0; i <= numSplits; ++i) {
3604 size_t srcBytes;
3605 size_t cSizeChunk;
3606 U32 const lastPartition = (i == numSplits);
3607 U32 lastBlockEntireSrc = 0;
3608
3609 srcBytes = ZSTD_countSeqStoreLiteralsBytes(currSeqStore) + ZSTD_countSeqStoreMatchBytes(currSeqStore);
3610 srcBytesTotal += srcBytes;
3611 if (lastPartition) {
3612 /* This is the final partition, need to account for possible last literals */
3613 srcBytes += blockSize - srcBytesTotal;
3614 lastBlockEntireSrc = lastBlock;
3615 } else {
3616 ZSTD_deriveSeqStoreChunk(nextSeqStore, &zc->seqStore, partitions[i], partitions[i+1]);
3617 }
3618
3619 cSizeChunk = ZSTD_compressSeqStore_singleBlock(zc, currSeqStore,
3620 &dRep, &cRep,
3621 op, dstCapacity,
3622 ip, srcBytes,
3623 lastBlockEntireSrc, 1 /* isPartition */);
3624 DEBUGLOG(5, "Estimated size: %zu actual size: %zu", ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize(currSeqStore, zc), cSizeChunk);
3625 FORWARD_IF_ERROR(cSizeChunk, "Compressing chunk failed!");
3626
3627 ip += srcBytes;
3628 op += cSizeChunk;
3629 dstCapacity -= cSizeChunk;
3630 cSize += cSizeChunk;
3631 *currSeqStore = *nextSeqStore;
3632 assert(cSizeChunk <= ZSTD_BLOCKSIZE_MAX + ZSTD_blockHeaderSize);
3633 }
3634 /* cRep and dRep may have diverged during the compression. If so, we use the dRep repcodes
3635 * for the next block.
3636 */
3637 ZSTD_memcpy(zc->blockState.prevCBlock->rep, dRep.rep, sizeof(repcodes_t));
3638 return cSize;
3639 }
3640
3641 static size_t
3642 ZSTD_compressBlock_splitBlock(ZSTD_CCtx* zc,
3643 void* dst, size_t dstCapacity,
3644 const void* src, size_t srcSize, U32 lastBlock)
3645 {
3646 const BYTE* ip = (const BYTE*)src;
3647 BYTE* op = (BYTE*)dst;
3648 U32 nbSeq;
3649 size_t cSize;
3650 DEBUGLOG(4, "ZSTD_compressBlock_splitBlock");
3651 assert(zc->appliedParams.useBlockSplitter == ZSTD_ps_enable);
3652
3653 { const size_t bss = ZSTD_buildSeqStore(zc, src, srcSize);
3654 FORWARD_IF_ERROR(bss, "ZSTD_buildSeqStore failed");
3655 if (bss == ZSTDbss_noCompress) {
3656 if (zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid)
3657 zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check;
3658 cSize = ZSTD_noCompressBlock(op, dstCapacity, ip, srcSize, lastBlock);
3659 FORWARD_IF_ERROR(cSize, "ZSTD_noCompressBlock failed");
3660 DEBUGLOG(4, "ZSTD_compressBlock_splitBlock: Nocompress block");
3661 return cSize;
3662 }
3663 nbSeq = (U32)(zc->seqStore.sequences - zc->seqStore.sequencesStart);
3664 }
3665
3666 cSize = ZSTD_compressBlock_splitBlock_internal(zc, dst, dstCapacity, src, srcSize, lastBlock, nbSeq);
3667 FORWARD_IF_ERROR(cSize, "Splitting blocks failed!");
3668 return cSize;
3669 }
3670
3671 static size_t
3672 ZSTD_compressBlock_internal(ZSTD_CCtx* zc,
3673 void* dst, size_t dstCapacity,
3674 const void* src, size_t srcSize, U32 frame)
3675 {
3676 /* This the upper bound for the length of an rle block.
3677 * This isn't the actual upper bound. Finding the real threshold
3678 * needs further investigation.
3679 */
3680 const U32 rleMaxLength = 25;
3681 size_t cSize;
3682 const BYTE* ip = (const BYTE*)src;
3683 BYTE* op = (BYTE*)dst;
3684 DEBUGLOG(5, "ZSTD_compressBlock_internal (dstCapacity=%u, dictLimit=%u, nextToUpdate=%u)",
3685 (unsigned)dstCapacity, (unsigned)zc->blockState.matchState.window.dictLimit,
3686 (unsigned)zc->blockState.matchState.nextToUpdate);
3687
3688 { const size_t bss = ZSTD_buildSeqStore(zc, src, srcSize);
3689 FORWARD_IF_ERROR(bss, "ZSTD_buildSeqStore failed");
3690 if (bss == ZSTDbss_noCompress) { cSize = 0; goto out; }
3691 }
3692
3693 if (zc->seqCollector.collectSequences) {
3694 ZSTD_copyBlockSequences(zc);
3695 ZSTD_blockState_confirmRepcodesAndEntropyTables(&zc->blockState);
3696 return 0;
3697 }
3698
3699 /* encode sequences and literals */
3700 cSize = ZSTD_entropyCompressSeqStore(&zc->seqStore,
3701 &zc->blockState.prevCBlock->entropy, &zc->blockState.nextCBlock->entropy,
3702 &zc->appliedParams,
3703 dst, dstCapacity,
3704 srcSize,
3705 zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE /* statically allocated in resetCCtx */,
3706 zc->bmi2);
3707
3708 if (frame &&
3709 /* We don't want to emit our first block as a RLE even if it qualifies because
3710 * doing so will cause the decoder (cli only) to throw a "should consume all input error."
3711 * This is only an issue for zstd <= v1.4.3
3712 */
3713 !zc->isFirstBlock &&
3714 cSize < rleMaxLength &&
3715 ZSTD_isRLE(ip, srcSize))
3716 {
3717 cSize = 1;
3718 op[0] = ip[0];
3719 }
3720
3721 out:
3722 if (!ZSTD_isError(cSize) && cSize > 1) {
3723 ZSTD_blockState_confirmRepcodesAndEntropyTables(&zc->blockState);
3724 }
3725 /* We check that dictionaries have offset codes available for the first
3726 * block. After the first block, the offcode table might not have large
3727 * enough codes to represent the offsets in the data.
3728 */
3729 if (zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid)
3730 zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check;
3731
3732 return cSize;
3733 }
3734
3735 static size_t ZSTD_compressBlock_targetCBlockSize_body(ZSTD_CCtx* zc,
3736 void* dst, size_t dstCapacity,
3737 const void* src, size_t srcSize,
3738 const size_t bss, U32 lastBlock)
3739 {
3740 DEBUGLOG(6, "Attempting ZSTD_compressSuperBlock()");
3741 if (bss == ZSTDbss_compress) {
3742 if (/* We don't want to emit our first block as a RLE even if it qualifies because
3743 * doing so will cause the decoder (cli only) to throw a "should consume all input error."
3744 * This is only an issue for zstd <= v1.4.3
3745 */
3746 !zc->isFirstBlock &&
3747 ZSTD_maybeRLE(&zc->seqStore) &&
3748 ZSTD_isRLE((BYTE const*)src, srcSize))
3749 {
3750 return ZSTD_rleCompressBlock(dst, dstCapacity, *(BYTE const*)src, srcSize, lastBlock);
3751 }
3752 /* Attempt superblock compression.
3753 *
3754 * Note that compressed size of ZSTD_compressSuperBlock() is not bound by the
3755 * standard ZSTD_compressBound(). This is a problem, because even if we have
3756 * space now, taking an extra byte now could cause us to run out of space later
3757 * and violate ZSTD_compressBound().
3758 *
3759 * Define blockBound(blockSize) = blockSize + ZSTD_blockHeaderSize.
3760 *
3761 * In order to respect ZSTD_compressBound() we must attempt to emit a raw
3762 * uncompressed block in these cases:
3763 * * cSize == 0: Return code for an uncompressed block.
3764 * * cSize == dstSize_tooSmall: We may have expanded beyond blockBound(srcSize).
3765 * ZSTD_noCompressBlock() will return dstSize_tooSmall if we are really out of
3766 * output space.
3767 * * cSize >= blockBound(srcSize): We have expanded the block too much so
3768 * emit an uncompressed block.
3769 */
3770 {
3771 size_t const cSize = ZSTD_compressSuperBlock(zc, dst, dstCapacity, src, srcSize, lastBlock);
3772 if (cSize != ERROR(dstSize_tooSmall)) {
3773 size_t const maxCSize = srcSize - ZSTD_minGain(srcSize, zc->appliedParams.cParams.strategy);
3774 FORWARD_IF_ERROR(cSize, "ZSTD_compressSuperBlock failed");
3775 if (cSize != 0 && cSize < maxCSize + ZSTD_blockHeaderSize) {
3776 ZSTD_blockState_confirmRepcodesAndEntropyTables(&zc->blockState);
3777 return cSize;
3778 }
3779 }
3780 }
3781 }
3782
3783 DEBUGLOG(6, "Resorting to ZSTD_noCompressBlock()");
3784 /* Superblock compression failed, attempt to emit a single no compress block.
3785 * The decoder will be able to stream this block since it is uncompressed.
3786 */
3787 return ZSTD_noCompressBlock(dst, dstCapacity, src, srcSize, lastBlock);
3788 }
3789
3790 static size_t ZSTD_compressBlock_targetCBlockSize(ZSTD_CCtx* zc,
3791 void* dst, size_t dstCapacity,
3792 const void* src, size_t srcSize,
3793 U32 lastBlock)
3794 {
3795 size_t cSize = 0;
3796 const size_t bss = ZSTD_buildSeqStore(zc, src, srcSize);
3797 DEBUGLOG(5, "ZSTD_compressBlock_targetCBlockSize (dstCapacity=%u, dictLimit=%u, nextToUpdate=%u, srcSize=%zu)",
3798 (unsigned)dstCapacity, (unsigned)zc->blockState.matchState.window.dictLimit, (unsigned)zc->blockState.matchState.nextToUpdate, srcSize);
3799 FORWARD_IF_ERROR(bss, "ZSTD_buildSeqStore failed");
3800
3801 cSize = ZSTD_compressBlock_targetCBlockSize_body(zc, dst, dstCapacity, src, srcSize, bss, lastBlock);
3802 FORWARD_IF_ERROR(cSize, "ZSTD_compressBlock_targetCBlockSize_body failed");
3803
3804 if (zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid)
3805 zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check;
3806
3807 return cSize;
3808 }
3809
3810 static void ZSTD_overflowCorrectIfNeeded(ZSTD_matchState_t* ms,
3811 ZSTD_cwksp* ws,
3812 ZSTD_CCtx_params const* params,
3813 void const* ip,
3814 void const* iend)
3815 {
3816 U32 const cycleLog = ZSTD_cycleLog(params->cParams.chainLog, params->cParams.strategy);
3817 U32 const maxDist = (U32)1 << params->cParams.windowLog;
3818 if (ZSTD_window_needOverflowCorrection(ms->window, cycleLog, maxDist, ms->loadedDictEnd, ip, iend)) {
3819 U32 const correction = ZSTD_window_correctOverflow(&ms->window, cycleLog, maxDist, ip);
3820 ZSTD_STATIC_ASSERT(ZSTD_CHAINLOG_MAX <= 30);
3821 ZSTD_STATIC_ASSERT(ZSTD_WINDOWLOG_MAX_32 <= 30);
3822 ZSTD_STATIC_ASSERT(ZSTD_WINDOWLOG_MAX <= 31);
3823 ZSTD_cwksp_mark_tables_dirty(ws);
3824 ZSTD_reduceIndex(ms, params, correction);
3825 ZSTD_cwksp_mark_tables_clean(ws);
3826 if (ms->nextToUpdate < correction) ms->nextToUpdate = 0;
3827 else ms->nextToUpdate -= correction;
3828 /* invalidate dictionaries on overflow correction */
3829 ms->loadedDictEnd = 0;
3830 ms->dictMatchState = NULL;
3831 }
3832 }
3833
3834 /*! ZSTD_compress_frameChunk() :
3835 * Compress a chunk of data into one or multiple blocks.
3836 * All blocks will be terminated, all input will be consumed.
3837 * Function will issue an error if there is not enough `dstCapacity` to hold the compressed content.
3838 * Frame is supposed already started (header already produced)
3839 * @return : compressed size, or an error code
3840 */
3841 static size_t ZSTD_compress_frameChunk(ZSTD_CCtx* cctx,
3842 void* dst, size_t dstCapacity,
3843 const void* src, size_t srcSize,
3844 U32 lastFrameChunk)
3845 {
3846 size_t blockSize = cctx->blockSize;
3847 size_t remaining = srcSize;
3848 const BYTE* ip = (const BYTE*)src;
3849 BYTE* const ostart = (BYTE*)dst;
3850 BYTE* op = ostart;
3851 U32 const maxDist = (U32)1 << cctx->appliedParams.cParams.windowLog;
3852
3853 assert(cctx->appliedParams.cParams.windowLog <= ZSTD_WINDOWLOG_MAX);
3854
3855 DEBUGLOG(4, "ZSTD_compress_frameChunk (blockSize=%u)", (unsigned)blockSize);
3856 if (cctx->appliedParams.fParams.checksumFlag && srcSize)
3857 xxh64_update(&cctx->xxhState, src, srcSize);
3858
3859 while (remaining) {
3860 ZSTD_matchState_t* const ms = &cctx->blockState.matchState;
3861 U32 const lastBlock = lastFrameChunk & (blockSize >= remaining);
3862
3863 RETURN_ERROR_IF(dstCapacity < ZSTD_blockHeaderSize + MIN_CBLOCK_SIZE,
3864 dstSize_tooSmall,
3865 "not enough space to store compressed block");
3866 if (remaining < blockSize) blockSize = remaining;
3867
3868 ZSTD_overflowCorrectIfNeeded(
3869 ms, &cctx->workspace, &cctx->appliedParams, ip, ip + blockSize);
3870 ZSTD_checkDictValidity(&ms->window, ip + blockSize, maxDist, &ms->loadedDictEnd, &ms->dictMatchState);
3871 ZSTD_window_enforceMaxDist(&ms->window, ip, maxDist, &ms->loadedDictEnd, &ms->dictMatchState);
3872
3873 /* Ensure hash/chain table insertion resumes no sooner than lowlimit */
3874 if (ms->nextToUpdate < ms->window.lowLimit) ms->nextToUpdate = ms->window.lowLimit;
3875
3876 { size_t cSize;
3877 if (ZSTD_useTargetCBlockSize(&cctx->appliedParams)) {
3878 cSize = ZSTD_compressBlock_targetCBlockSize(cctx, op, dstCapacity, ip, blockSize, lastBlock);
3879 FORWARD_IF_ERROR(cSize, "ZSTD_compressBlock_targetCBlockSize failed");
3880 assert(cSize > 0);
3881 assert(cSize <= blockSize + ZSTD_blockHeaderSize);
3882 } else if (ZSTD_blockSplitterEnabled(&cctx->appliedParams)) {
3883 cSize = ZSTD_compressBlock_splitBlock(cctx, op, dstCapacity, ip, blockSize, lastBlock);
3884 FORWARD_IF_ERROR(cSize, "ZSTD_compressBlock_splitBlock failed");
3885 assert(cSize > 0 || cctx->seqCollector.collectSequences == 1);
3886 } else {
3887 cSize = ZSTD_compressBlock_internal(cctx,
3888 op+ZSTD_blockHeaderSize, dstCapacity-ZSTD_blockHeaderSize,
3889 ip, blockSize, 1 /* frame */);
3890 FORWARD_IF_ERROR(cSize, "ZSTD_compressBlock_internal failed");
3891
3892 if (cSize == 0) { /* block is not compressible */
3893 cSize = ZSTD_noCompressBlock(op, dstCapacity, ip, blockSize, lastBlock);
3894 FORWARD_IF_ERROR(cSize, "ZSTD_noCompressBlock failed");
3895 } else {
3896 U32 const cBlockHeader = cSize == 1 ?
3897 lastBlock + (((U32)bt_rle)<<1) + (U32)(blockSize << 3) :
3898 lastBlock + (((U32)bt_compressed)<<1) + (U32)(cSize << 3);
3899 MEM_writeLE24(op, cBlockHeader);
3900 cSize += ZSTD_blockHeaderSize;
3901 }
3902 }
3903
3904
3905 ip += blockSize;
3906 assert(remaining >= blockSize);
3907 remaining -= blockSize;
3908 op += cSize;
3909 assert(dstCapacity >= cSize);
3910 dstCapacity -= cSize;
3911 cctx->isFirstBlock = 0;
3912 DEBUGLOG(5, "ZSTD_compress_frameChunk: adding a block of size %u",
3913 (unsigned)cSize);
3914 } }
3915
3916 if (lastFrameChunk && (op>ostart)) cctx->stage = ZSTDcs_ending;
3917 return (size_t)(op-ostart);
3918 }
3919
3920
3921 static size_t ZSTD_writeFrameHeader(void* dst, size_t dstCapacity,
3922 const ZSTD_CCtx_params* params, U64 pledgedSrcSize, U32 dictID)
3923 { BYTE* const op = (BYTE*)dst;
3924 U32 const dictIDSizeCodeLength = (dictID>0) + (dictID>=256) + (dictID>=65536); /* 0-3 */
3925 U32 const dictIDSizeCode = params->fParams.noDictIDFlag ? 0 : dictIDSizeCodeLength; /* 0-3 */
3926 U32 const checksumFlag = params->fParams.checksumFlag>0;
3927 U32 const windowSize = (U32)1 << params->cParams.windowLog;
3928 U32 const singleSegment = params->fParams.contentSizeFlag && (windowSize >= pledgedSrcSize);
3929 BYTE const windowLogByte = (BYTE)((params->cParams.windowLog - ZSTD_WINDOWLOG_ABSOLUTEMIN) << 3);
3930 U32 const fcsCode = params->fParams.contentSizeFlag ?
3931 (pledgedSrcSize>=256) + (pledgedSrcSize>=65536+256) + (pledgedSrcSize>=0xFFFFFFFFU) : 0; /* 0-3 */
3932 BYTE const frameHeaderDescriptionByte = (BYTE)(dictIDSizeCode + (checksumFlag<<2) + (singleSegment<<5) + (fcsCode<<6) );
3933 size_t pos=0;
3934
3935 assert(!(params->fParams.contentSizeFlag && pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN));
3936 RETURN_ERROR_IF(dstCapacity < ZSTD_FRAMEHEADERSIZE_MAX, dstSize_tooSmall,
3937 "dst buf is too small to fit worst-case frame header size.");
3938 DEBUGLOG(4, "ZSTD_writeFrameHeader : dictIDFlag : %u ; dictID : %u ; dictIDSizeCode : %u",
3939 !params->fParams.noDictIDFlag, (unsigned)dictID, (unsigned)dictIDSizeCode);
3940 if (params->format == ZSTD_f_zstd1) {
3941 MEM_writeLE32(dst, ZSTD_MAGICNUMBER);
3942 pos = 4;
3943 }
3944 op[pos++] = frameHeaderDescriptionByte;
3945 if (!singleSegment) op[pos++] = windowLogByte;
3946 switch(dictIDSizeCode)
3947 {
3948 default:
3949 assert(0); /* impossible */
3950 ZSTD_FALLTHROUGH;
3951 case 0 : break;
3952 case 1 : op[pos] = (BYTE)(dictID); pos++; break;
3953 case 2 : MEM_writeLE16(op+pos, (U16)dictID); pos+=2; break;
3954 case 3 : MEM_writeLE32(op+pos, dictID); pos+=4; break;
3955 }
3956 switch(fcsCode)
3957 {
3958 default:
3959 assert(0); /* impossible */
3960 ZSTD_FALLTHROUGH;
3961 case 0 : if (singleSegment) op[pos++] = (BYTE)(pledgedSrcSize); break;
3962 case 1 : MEM_writeLE16(op+pos, (U16)(pledgedSrcSize-256)); pos+=2; break;
3963 case 2 : MEM_writeLE32(op+pos, (U32)(pledgedSrcSize)); pos+=4; break;
3964 case 3 : MEM_writeLE64(op+pos, (U64)(pledgedSrcSize)); pos+=8; break;
3965 }
3966 return pos;
3967 }
3968
3969 /* ZSTD_writeSkippableFrame_advanced() :
3970 * Writes out a skippable frame with the specified magic number variant (16 are supported),
3971 * from ZSTD_MAGIC_SKIPPABLE_START to ZSTD_MAGIC_SKIPPABLE_START+15, and the desired source data.
3972 *
3973 * Returns the total number of bytes written, or a ZSTD error code.
3974 */
3975 size_t ZSTD_writeSkippableFrame(void* dst, size_t dstCapacity,
3976 const void* src, size_t srcSize, unsigned magicVariant) {
3977 BYTE* op = (BYTE*)dst;
3978 RETURN_ERROR_IF(dstCapacity < srcSize + ZSTD_SKIPPABLEHEADERSIZE /* Skippable frame overhead */,
3979 dstSize_tooSmall, "Not enough room for skippable frame");
3980 RETURN_ERROR_IF(srcSize > (unsigned)0xFFFFFFFF, srcSize_wrong, "Src size too large for skippable frame");
3981 RETURN_ERROR_IF(magicVariant > 15, parameter_outOfBound, "Skippable frame magic number variant not supported");
3982
3983 MEM_writeLE32(op, (U32)(ZSTD_MAGIC_SKIPPABLE_START + magicVariant));
3984 MEM_writeLE32(op+4, (U32)srcSize);
3985 ZSTD_memcpy(op+8, src, srcSize);
3986 return srcSize + ZSTD_SKIPPABLEHEADERSIZE;
3987 }
3988
3989 /* ZSTD_writeLastEmptyBlock() :
3990 * output an empty Block with end-of-frame mark to complete a frame
3991 * @return : size of data written into `dst` (== ZSTD_blockHeaderSize (defined in zstd_internal.h))
3992 * or an error code if `dstCapacity` is too small (<ZSTD_blockHeaderSize)
3993 */
3994 size_t ZSTD_writeLastEmptyBlock(void* dst, size_t dstCapacity)
3995 {
3996 RETURN_ERROR_IF(dstCapacity < ZSTD_blockHeaderSize, dstSize_tooSmall,
3997 "dst buf is too small to write frame trailer empty block.");
3998 { U32 const cBlockHeader24 = 1 /*lastBlock*/ + (((U32)bt_raw)<<1); /* 0 size */
3999 MEM_writeLE24(dst, cBlockHeader24);
4000 return ZSTD_blockHeaderSize;
4001 }
4002 }
4003
4004 size_t ZSTD_referenceExternalSequences(ZSTD_CCtx* cctx, rawSeq* seq, size_t nbSeq)
4005 {
4006 RETURN_ERROR_IF(cctx->stage != ZSTDcs_init, stage_wrong,
4007 "wrong cctx stage");
4008 RETURN_ERROR_IF(cctx->appliedParams.ldmParams.enableLdm == ZSTD_ps_enable,
4009 parameter_unsupported,
4010 "incompatible with ldm");
4011 cctx->externSeqStore.seq = seq;
4012 cctx->externSeqStore.size = nbSeq;
4013 cctx->externSeqStore.capacity = nbSeq;
4014 cctx->externSeqStore.pos = 0;
4015 cctx->externSeqStore.posInSequence = 0;
4016 return 0;
4017 }
4018
4019
4020 static size_t ZSTD_compressContinue_internal (ZSTD_CCtx* cctx,
4021 void* dst, size_t dstCapacity,
4022 const void* src, size_t srcSize,
4023 U32 frame, U32 lastFrameChunk)
4024 {
4025 ZSTD_matchState_t* const ms = &cctx->blockState.matchState;
4026 size_t fhSize = 0;
4027
4028 DEBUGLOG(5, "ZSTD_compressContinue_internal, stage: %u, srcSize: %u",
4029 cctx->stage, (unsigned)srcSize);
4030 RETURN_ERROR_IF(cctx->stage==ZSTDcs_created, stage_wrong,
4031 "missing init (ZSTD_compressBegin)");
4032
4033 if (frame && (cctx->stage==ZSTDcs_init)) {
4034 fhSize = ZSTD_writeFrameHeader(dst, dstCapacity, &cctx->appliedParams,
4035 cctx->pledgedSrcSizePlusOne-1, cctx->dictID);
4036 FORWARD_IF_ERROR(fhSize, "ZSTD_writeFrameHeader failed");
4037 assert(fhSize <= dstCapacity);
4038 dstCapacity -= fhSize;
4039 dst = (char*)dst + fhSize;
4040 cctx->stage = ZSTDcs_ongoing;
4041 }
4042
4043 if (!srcSize) return fhSize; /* do not generate an empty block if no input */
4044
4045 if (!ZSTD_window_update(&ms->window, src, srcSize, ms->forceNonContiguous)) {
4046 ms->forceNonContiguous = 0;
4047 ms->nextToUpdate = ms->window.dictLimit;
4048 }
4049 if (cctx->appliedParams.ldmParams.enableLdm == ZSTD_ps_enable) {
4050 ZSTD_window_update(&cctx->ldmState.window, src, srcSize, /* forceNonContiguous */ 0);
4051 }
4052
4053 if (!frame) {
4054 /* overflow check and correction for block mode */
4055 ZSTD_overflowCorrectIfNeeded(
4056 ms, &cctx->workspace, &cctx->appliedParams,
4057 src, (BYTE const*)src + srcSize);
4058 }
4059
4060 DEBUGLOG(5, "ZSTD_compressContinue_internal (blockSize=%u)", (unsigned)cctx->blockSize);
4061 { size_t const cSize = frame ?
4062 ZSTD_compress_frameChunk (cctx, dst, dstCapacity, src, srcSize, lastFrameChunk) :
4063 ZSTD_compressBlock_internal (cctx, dst, dstCapacity, src, srcSize, 0 /* frame */);
4064 FORWARD_IF_ERROR(cSize, "%s", frame ? "ZSTD_compress_frameChunk failed" : "ZSTD_compressBlock_internal failed");
4065 cctx->consumedSrcSize += srcSize;
4066 cctx->producedCSize += (cSize + fhSize);
4067 assert(!(cctx->appliedParams.fParams.contentSizeFlag && cctx->pledgedSrcSizePlusOne == 0));
4068 if (cctx->pledgedSrcSizePlusOne != 0) { /* control src size */
4069 ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_UNKNOWN == (unsigned long long)-1);
4070 RETURN_ERROR_IF(
4071 cctx->consumedSrcSize+1 > cctx->pledgedSrcSizePlusOne,
4072 srcSize_wrong,
4073 "error : pledgedSrcSize = %u, while realSrcSize >= %u",
4074 (unsigned)cctx->pledgedSrcSizePlusOne-1,
4075 (unsigned)cctx->consumedSrcSize);
4076 }
4077 return cSize + fhSize;
4078 }
4079 }
4080
4081 size_t ZSTD_compressContinue (ZSTD_CCtx* cctx,
4082 void* dst, size_t dstCapacity,
4083 const void* src, size_t srcSize)
4084 {
4085 DEBUGLOG(5, "ZSTD_compressContinue (srcSize=%u)", (unsigned)srcSize);
4086 return ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 1 /* frame mode */, 0 /* last chunk */);
4087 }
4088
4089
4090 size_t ZSTD_getBlockSize(const ZSTD_CCtx* cctx)
4091 {
4092 ZSTD_compressionParameters const cParams = cctx->appliedParams.cParams;
4093 assert(!ZSTD_checkCParams(cParams));
4094 return MIN (ZSTD_BLOCKSIZE_MAX, (U32)1 << cParams.windowLog);
4095 }
4096
4097 size_t ZSTD_compressBlock(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize)
4098 {
4099 DEBUGLOG(5, "ZSTD_compressBlock: srcSize = %u", (unsigned)srcSize);
4100 { size_t const blockSizeMax = ZSTD_getBlockSize(cctx);
4101 RETURN_ERROR_IF(srcSize > blockSizeMax, srcSize_wrong, "input is larger than a block"); }
4102
4103 return ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 0 /* frame mode */, 0 /* last chunk */);
4104 }
4105
4106 /*! ZSTD_loadDictionaryContent() :
4107 * @return : 0, or an error code
4108 */
4109 static size_t ZSTD_loadDictionaryContent(ZSTD_matchState_t* ms,
4110 ldmState_t* ls,
4111 ZSTD_cwksp* ws,
4112 ZSTD_CCtx_params const* params,
4113 const void* src, size_t srcSize,
4114 ZSTD_dictTableLoadMethod_e dtlm)
4115 {
4116 const BYTE* ip = (const BYTE*) src;
4117 const BYTE* const iend = ip + srcSize;
4118 int const loadLdmDict = params->ldmParams.enableLdm == ZSTD_ps_enable && ls != NULL;
4119
4120 /* Assert that we the ms params match the params we're being given */
4121 ZSTD_assertEqualCParams(params->cParams, ms->cParams);
4122
4123 if (srcSize > ZSTD_CHUNKSIZE_MAX) {
4124 /* Allow the dictionary to set indices up to exactly ZSTD_CURRENT_MAX.
4125 * Dictionaries right at the edge will immediately trigger overflow
4126 * correction, but I don't want to insert extra constraints here.
4127 */
4128 U32 const maxDictSize = ZSTD_CURRENT_MAX - 1;
4129 /* We must have cleared our windows when our source is this large. */
4130 assert(ZSTD_window_isEmpty(ms->window));
4131 if (loadLdmDict)
4132 assert(ZSTD_window_isEmpty(ls->window));
4133 /* If the dictionary is too large, only load the suffix of the dictionary. */
4134 if (srcSize > maxDictSize) {
4135 ip = iend - maxDictSize;
4136 src = ip;
4137 srcSize = maxDictSize;
4138 }
4139 }
4140
4141 DEBUGLOG(4, "ZSTD_loadDictionaryContent(): useRowMatchFinder=%d", (int)params->useRowMatchFinder);
4142 ZSTD_window_update(&ms->window, src, srcSize, /* forceNonContiguous */ 0);
4143 ms->loadedDictEnd = params->forceWindow ? 0 : (U32)(iend - ms->window.base);
4144 ms->forceNonContiguous = params->deterministicRefPrefix;
4145
4146 if (loadLdmDict) {
4147 ZSTD_window_update(&ls->window, src, srcSize, /* forceNonContiguous */ 0);
4148 ls->loadedDictEnd = params->forceWindow ? 0 : (U32)(iend - ls->window.base);
4149 }
4150
4151 if (srcSize <= HASH_READ_SIZE) return 0;
4152
4153 ZSTD_overflowCorrectIfNeeded(ms, ws, params, ip, iend);
4154
4155 if (loadLdmDict)
4156 ZSTD_ldm_fillHashTable(ls, ip, iend, ¶ms->ldmParams);
4157
4158 switch(params->cParams.strategy)
4159 {
4160 case ZSTD_fast:
4161 ZSTD_fillHashTable(ms, iend, dtlm);
4162 break;
4163 case ZSTD_dfast:
4164 ZSTD_fillDoubleHashTable(ms, iend, dtlm);
4165 break;
4166
4167 case ZSTD_greedy:
4168 case ZSTD_lazy:
4169 case ZSTD_lazy2:
4170 assert(srcSize >= HASH_READ_SIZE);
4171 if (ms->dedicatedDictSearch) {
4172 assert(ms->chainTable != NULL);
4173 ZSTD_dedicatedDictSearch_lazy_loadDictionary(ms, iend-HASH_READ_SIZE);
4174 } else {
4175 assert(params->useRowMatchFinder != ZSTD_ps_auto);
4176 if (params->useRowMatchFinder == ZSTD_ps_enable) {
4177 size_t const tagTableSize = ((size_t)1 << params->cParams.hashLog) * sizeof(U16);
4178 ZSTD_memset(ms->tagTable, 0, tagTableSize);
4179 ZSTD_row_update(ms, iend-HASH_READ_SIZE);
4180 DEBUGLOG(4, "Using row-based hash table for lazy dict");
4181 } else {
4182 ZSTD_insertAndFindFirstIndex(ms, iend-HASH_READ_SIZE);
4183 DEBUGLOG(4, "Using chain-based hash table for lazy dict");
4184 }
4185 }
4186 break;
4187
4188 case ZSTD_btlazy2: /* we want the dictionary table fully sorted */
4189 case ZSTD_btopt:
4190 case ZSTD_btultra:
4191 case ZSTD_btultra2:
4192 assert(srcSize >= HASH_READ_SIZE);
4193 ZSTD_updateTree(ms, iend-HASH_READ_SIZE, iend);
4194 break;
4195
4196 default:
4197 assert(0); /* not possible : not a valid strategy id */
4198 }
4199
4200 ms->nextToUpdate = (U32)(iend - ms->window.base);
4201 return 0;
4202 }
4203
4204
4205 /* Dictionaries that assign zero probability to symbols that show up causes problems
4206 * when FSE encoding. Mark dictionaries with zero probability symbols as FSE_repeat_check
4207 * and only dictionaries with 100% valid symbols can be assumed valid.
4208 */
4209 static FSE_repeat ZSTD_dictNCountRepeat(short* normalizedCounter, unsigned dictMaxSymbolValue, unsigned maxSymbolValue)
4210 {
4211 U32 s;
4212 if (dictMaxSymbolValue < maxSymbolValue) {
4213 return FSE_repeat_check;
4214 }
4215 for (s = 0; s <= maxSymbolValue; ++s) {
4216 if (normalizedCounter[s] == 0) {
4217 return FSE_repeat_check;
4218 }
4219 }
4220 return FSE_repeat_valid;
4221 }
4222
4223 size_t ZSTD_loadCEntropy(ZSTD_compressedBlockState_t* bs, void* workspace,
4224 const void* const dict, size_t dictSize)
4225 {
4226 short offcodeNCount[MaxOff+1];
4227 unsigned offcodeMaxValue = MaxOff;
4228 const BYTE* dictPtr = (const BYTE*)dict; /* skip magic num and dict ID */
4229 const BYTE* const dictEnd = dictPtr + dictSize;
4230 dictPtr += 8;
4231 bs->entropy.huf.repeatMode = HUF_repeat_check;
4232
4233 { unsigned maxSymbolValue = 255;
4234 unsigned hasZeroWeights = 1;
4235 size_t const hufHeaderSize = HUF_readCTable((HUF_CElt*)bs->entropy.huf.CTable, &maxSymbolValue, dictPtr,
4236 dictEnd-dictPtr, &hasZeroWeights);
4237
4238 /* We only set the loaded table as valid if it contains all non-zero
4239 * weights. Otherwise, we set it to check */
4240 if (!hasZeroWeights)
4241 bs->entropy.huf.repeatMode = HUF_repeat_valid;
4242
4243 RETURN_ERROR_IF(HUF_isError(hufHeaderSize), dictionary_corrupted, "");
4244 RETURN_ERROR_IF(maxSymbolValue < 255, dictionary_corrupted, "");
4245 dictPtr += hufHeaderSize;
4246 }
4247
4248 { unsigned offcodeLog;
4249 size_t const offcodeHeaderSize = FSE_readNCount(offcodeNCount, &offcodeMaxValue, &offcodeLog, dictPtr, dictEnd-dictPtr);
4250 RETURN_ERROR_IF(FSE_isError(offcodeHeaderSize), dictionary_corrupted, "");
4251 RETURN_ERROR_IF(offcodeLog > OffFSELog, dictionary_corrupted, "");
4252 /* fill all offset symbols to avoid garbage at end of table */
4253 RETURN_ERROR_IF(FSE_isError(FSE_buildCTable_wksp(
4254 bs->entropy.fse.offcodeCTable,
4255 offcodeNCount, MaxOff, offcodeLog,
4256 workspace, HUF_WORKSPACE_SIZE)),
4257 dictionary_corrupted, "");
4258 /* Defer checking offcodeMaxValue because we need to know the size of the dictionary content */
4259 dictPtr += offcodeHeaderSize;
4260 }
4261
4262 { short matchlengthNCount[MaxML+1];
4263 unsigned matchlengthMaxValue = MaxML, matchlengthLog;
4264 size_t const matchlengthHeaderSize = FSE_readNCount(matchlengthNCount, &matchlengthMaxValue, &matchlengthLog, dictPtr, dictEnd-dictPtr);
4265 RETURN_ERROR_IF(FSE_isError(matchlengthHeaderSize), dictionary_corrupted, "");
4266 RETURN_ERROR_IF(matchlengthLog > MLFSELog, dictionary_corrupted, "");
4267 RETURN_ERROR_IF(FSE_isError(FSE_buildCTable_wksp(
4268 bs->entropy.fse.matchlengthCTable,
4269 matchlengthNCount, matchlengthMaxValue, matchlengthLog,
4270 workspace, HUF_WORKSPACE_SIZE)),
4271 dictionary_corrupted, "");
4272 bs->entropy.fse.matchlength_repeatMode = ZSTD_dictNCountRepeat(matchlengthNCount, matchlengthMaxValue, MaxML);
4273 dictPtr += matchlengthHeaderSize;
4274 }
4275
4276 { short litlengthNCount[MaxLL+1];
4277 unsigned litlengthMaxValue = MaxLL, litlengthLog;
4278 size_t const litlengthHeaderSize = FSE_readNCount(litlengthNCount, &litlengthMaxValue, &litlengthLog, dictPtr, dictEnd-dictPtr);
4279 RETURN_ERROR_IF(FSE_isError(litlengthHeaderSize), dictionary_corrupted, "");
4280 RETURN_ERROR_IF(litlengthLog > LLFSELog, dictionary_corrupted, "");
4281 RETURN_ERROR_IF(FSE_isError(FSE_buildCTable_wksp(
4282 bs->entropy.fse.litlengthCTable,
4283 litlengthNCount, litlengthMaxValue, litlengthLog,
4284 workspace, HUF_WORKSPACE_SIZE)),
4285 dictionary_corrupted, "");
4286 bs->entropy.fse.litlength_repeatMode = ZSTD_dictNCountRepeat(litlengthNCount, litlengthMaxValue, MaxLL);
4287 dictPtr += litlengthHeaderSize;
4288 }
4289
4290 RETURN_ERROR_IF(dictPtr+12 > dictEnd, dictionary_corrupted, "");
4291 bs->rep[0] = MEM_readLE32(dictPtr+0);
4292 bs->rep[1] = MEM_readLE32(dictPtr+4);
4293 bs->rep[2] = MEM_readLE32(dictPtr+8);
4294 dictPtr += 12;
4295
4296 { size_t const dictContentSize = (size_t)(dictEnd - dictPtr);
4297 U32 offcodeMax = MaxOff;
4298 if (dictContentSize <= ((U32)-1) - 128 KB) {
4299 U32 const maxOffset = (U32)dictContentSize + 128 KB; /* The maximum offset that must be supported */
4300 offcodeMax = ZSTD_highbit32(maxOffset); /* Calculate minimum offset code required to represent maxOffset */
4301 }
4302 /* All offset values <= dictContentSize + 128 KB must be representable for a valid table */
4303 bs->entropy.fse.offcode_repeatMode = ZSTD_dictNCountRepeat(offcodeNCount, offcodeMaxValue, MIN(offcodeMax, MaxOff));
4304
4305 /* All repCodes must be <= dictContentSize and != 0 */
4306 { U32 u;
4307 for (u=0; u<3; u++) {
4308 RETURN_ERROR_IF(bs->rep[u] == 0, dictionary_corrupted, "");
4309 RETURN_ERROR_IF(bs->rep[u] > dictContentSize, dictionary_corrupted, "");
4310 } } }
4311
4312 return dictPtr - (const BYTE*)dict;
4313 }
4314
4315 /* Dictionary format :
4316 * See :
4317 * https://github.com/facebook/zstd/blob/release/doc/zstd_compression_format.md#dictionary-format
4318 */
4319 /*! ZSTD_loadZstdDictionary() :
4320 * @return : dictID, or an error code
4321 * assumptions : magic number supposed already checked
4322 * dictSize supposed >= 8
4323 */
4324 static size_t ZSTD_loadZstdDictionary(ZSTD_compressedBlockState_t* bs,
4325 ZSTD_matchState_t* ms,
4326 ZSTD_cwksp* ws,
4327 ZSTD_CCtx_params const* params,
4328 const void* dict, size_t dictSize,
4329 ZSTD_dictTableLoadMethod_e dtlm,
4330 void* workspace)
4331 {
4332 const BYTE* dictPtr = (const BYTE*)dict;
4333 const BYTE* const dictEnd = dictPtr + dictSize;
4334 size_t dictID;
4335 size_t eSize;
4336 ZSTD_STATIC_ASSERT(HUF_WORKSPACE_SIZE >= (1<<MAX(MLFSELog,LLFSELog)));
4337 assert(dictSize >= 8);
4338 assert(MEM_readLE32(dictPtr) == ZSTD_MAGIC_DICTIONARY);
4339
4340 dictID = params->fParams.noDictIDFlag ? 0 : MEM_readLE32(dictPtr + 4 /* skip magic number */ );
4341 eSize = ZSTD_loadCEntropy(bs, workspace, dict, dictSize);
4342 FORWARD_IF_ERROR(eSize, "ZSTD_loadCEntropy failed");
4343 dictPtr += eSize;
4344
4345 {
4346 size_t const dictContentSize = (size_t)(dictEnd - dictPtr);
4347 FORWARD_IF_ERROR(ZSTD_loadDictionaryContent(
4348 ms, NULL, ws, params, dictPtr, dictContentSize, dtlm), "");
4349 }
4350 return dictID;
4351 }
4352
4353 /* ZSTD_compress_insertDictionary() :
4354 * @return : dictID, or an error code */
4355 static size_t
4356 ZSTD_compress_insertDictionary(ZSTD_compressedBlockState_t* bs,
4357 ZSTD_matchState_t* ms,
4358 ldmState_t* ls,
4359 ZSTD_cwksp* ws,
4360 const ZSTD_CCtx_params* params,
4361 const void* dict, size_t dictSize,
4362 ZSTD_dictContentType_e dictContentType,
4363 ZSTD_dictTableLoadMethod_e dtlm,
4364 void* workspace)
4365 {
4366 DEBUGLOG(4, "ZSTD_compress_insertDictionary (dictSize=%u)", (U32)dictSize);
4367 if ((dict==NULL) || (dictSize<8)) {
4368 RETURN_ERROR_IF(dictContentType == ZSTD_dct_fullDict, dictionary_wrong, "");
4369 return 0;
4370 }
4371
4372 ZSTD_reset_compressedBlockState(bs);
4373
4374 /* dict restricted modes */
4375 if (dictContentType == ZSTD_dct_rawContent)
4376 return ZSTD_loadDictionaryContent(ms, ls, ws, params, dict, dictSize, dtlm);
4377
4378 if (MEM_readLE32(dict) != ZSTD_MAGIC_DICTIONARY) {
4379 if (dictContentType == ZSTD_dct_auto) {
4380 DEBUGLOG(4, "raw content dictionary detected");
4381 return ZSTD_loadDictionaryContent(
4382 ms, ls, ws, params, dict, dictSize, dtlm);
4383 }
4384 RETURN_ERROR_IF(dictContentType == ZSTD_dct_fullDict, dictionary_wrong, "");
4385 assert(0); /* impossible */
4386 }
4387
4388 /* dict as full zstd dictionary */
4389 return ZSTD_loadZstdDictionary(
4390 bs, ms, ws, params, dict, dictSize, dtlm, workspace);
4391 }
4392
4393 #define ZSTD_USE_CDICT_PARAMS_SRCSIZE_CUTOFF (128 KB)
4394 #define ZSTD_USE_CDICT_PARAMS_DICTSIZE_MULTIPLIER (6ULL)
4395
4396 /*! ZSTD_compressBegin_internal() :
4397 * @return : 0, or an error code */
4398 static size_t ZSTD_compressBegin_internal(ZSTD_CCtx* cctx,
4399 const void* dict, size_t dictSize,
4400 ZSTD_dictContentType_e dictContentType,
4401 ZSTD_dictTableLoadMethod_e dtlm,
4402 const ZSTD_CDict* cdict,
4403 const ZSTD_CCtx_params* params, U64 pledgedSrcSize,
4404 ZSTD_buffered_policy_e zbuff)
4405 {
4406 size_t const dictContentSize = cdict ? cdict->dictContentSize : dictSize;
4407 DEBUGLOG(4, "ZSTD_compressBegin_internal: wlog=%u", params->cParams.windowLog);
4408 /* params are supposed to be fully validated at this point */
4409 assert(!ZSTD_isError(ZSTD_checkCParams(params->cParams)));
4410 assert(!((dict) && (cdict))); /* either dict or cdict, not both */
4411 if ( (cdict)
4412 && (cdict->dictContentSize > 0)
4413 && ( pledgedSrcSize < ZSTD_USE_CDICT_PARAMS_SRCSIZE_CUTOFF
4414 || pledgedSrcSize < cdict->dictContentSize * ZSTD_USE_CDICT_PARAMS_DICTSIZE_MULTIPLIER
4415 || pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN
4416 || cdict->compressionLevel == 0)
4417 && (params->attachDictPref != ZSTD_dictForceLoad) ) {
4418 return ZSTD_resetCCtx_usingCDict(cctx, cdict, params, pledgedSrcSize, zbuff);
4419 }
4420
4421 FORWARD_IF_ERROR( ZSTD_resetCCtx_internal(cctx, params, pledgedSrcSize,
4422 dictContentSize,
4423 ZSTDcrp_makeClean, zbuff) , "");
4424 { size_t const dictID = cdict ?
4425 ZSTD_compress_insertDictionary(
4426 cctx->blockState.prevCBlock, &cctx->blockState.matchState,
4427 &cctx->ldmState, &cctx->workspace, &cctx->appliedParams, cdict->dictContent,
4428 cdict->dictContentSize, cdict->dictContentType, dtlm,
4429 cctx->entropyWorkspace)
4430 : ZSTD_compress_insertDictionary(
4431 cctx->blockState.prevCBlock, &cctx->blockState.matchState,
4432 &cctx->ldmState, &cctx->workspace, &cctx->appliedParams, dict, dictSize,
4433 dictContentType, dtlm, cctx->entropyWorkspace);
4434 FORWARD_IF_ERROR(dictID, "ZSTD_compress_insertDictionary failed");
4435 assert(dictID <= UINT_MAX);
4436 cctx->dictID = (U32)dictID;
4437 cctx->dictContentSize = dictContentSize;
4438 }
4439 return 0;
4440 }
4441
4442 size_t ZSTD_compressBegin_advanced_internal(ZSTD_CCtx* cctx,
4443 const void* dict, size_t dictSize,
4444 ZSTD_dictContentType_e dictContentType,
4445 ZSTD_dictTableLoadMethod_e dtlm,
4446 const ZSTD_CDict* cdict,
4447 const ZSTD_CCtx_params* params,
4448 unsigned long long pledgedSrcSize)
4449 {
4450 DEBUGLOG(4, "ZSTD_compressBegin_advanced_internal: wlog=%u", params->cParams.windowLog);
4451 /* compression parameters verification and optimization */
4452 FORWARD_IF_ERROR( ZSTD_checkCParams(params->cParams) , "");
4453 return ZSTD_compressBegin_internal(cctx,
4454 dict, dictSize, dictContentType, dtlm,
4455 cdict,
4456 params, pledgedSrcSize,
4457 ZSTDb_not_buffered);
4458 }
4459
4460 /*! ZSTD_compressBegin_advanced() :
4461 * @return : 0, or an error code */
4462 size_t ZSTD_compressBegin_advanced(ZSTD_CCtx* cctx,
4463 const void* dict, size_t dictSize,
4464 ZSTD_parameters params, unsigned long long pledgedSrcSize)
4465 {
4466 ZSTD_CCtx_params cctxParams;
4467 ZSTD_CCtxParams_init_internal(&cctxParams, ¶ms, ZSTD_NO_CLEVEL);
4468 return ZSTD_compressBegin_advanced_internal(cctx,
4469 dict, dictSize, ZSTD_dct_auto, ZSTD_dtlm_fast,
4470 NULL /*cdict*/,
4471 &cctxParams, pledgedSrcSize);
4472 }
4473
4474 size_t ZSTD_compressBegin_usingDict(ZSTD_CCtx* cctx, const void* dict, size_t dictSize, int compressionLevel)
4475 {
4476 ZSTD_CCtx_params cctxParams;
4477 {
4478 ZSTD_parameters const params = ZSTD_getParams_internal(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_noAttachDict);
4479 ZSTD_CCtxParams_init_internal(&cctxParams, ¶ms, (compressionLevel == 0) ? ZSTD_CLEVEL_DEFAULT : compressionLevel);
4480 }
4481 DEBUGLOG(4, "ZSTD_compressBegin_usingDict (dictSize=%u)", (unsigned)dictSize);
4482 return ZSTD_compressBegin_internal(cctx, dict, dictSize, ZSTD_dct_auto, ZSTD_dtlm_fast, NULL,
4483 &cctxParams, ZSTD_CONTENTSIZE_UNKNOWN, ZSTDb_not_buffered);
4484 }
4485
4486 size_t ZSTD_compressBegin(ZSTD_CCtx* cctx, int compressionLevel)
4487 {
4488 return ZSTD_compressBegin_usingDict(cctx, NULL, 0, compressionLevel);
4489 }
4490
4491
4492 /*! ZSTD_writeEpilogue() :
4493 * Ends a frame.
4494 * @return : nb of bytes written into dst (or an error code) */
4495 static size_t ZSTD_writeEpilogue(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity)
4496 {
4497 BYTE* const ostart = (BYTE*)dst;
4498 BYTE* op = ostart;
4499 size_t fhSize = 0;
4500
4501 DEBUGLOG(4, "ZSTD_writeEpilogue");
4502 RETURN_ERROR_IF(cctx->stage == ZSTDcs_created, stage_wrong, "init missing");
4503
4504 /* special case : empty frame */
4505 if (cctx->stage == ZSTDcs_init) {
4506 fhSize = ZSTD_writeFrameHeader(dst, dstCapacity, &cctx->appliedParams, 0, 0);
4507 FORWARD_IF_ERROR(fhSize, "ZSTD_writeFrameHeader failed");
4508 dstCapacity -= fhSize;
4509 op += fhSize;
4510 cctx->stage = ZSTDcs_ongoing;
4511 }
4512
4513 if (cctx->stage != ZSTDcs_ending) {
4514 /* write one last empty block, make it the "last" block */
4515 U32 const cBlockHeader24 = 1 /* last block */ + (((U32)bt_raw)<<1) + 0;
4516 RETURN_ERROR_IF(dstCapacity<4, dstSize_tooSmall, "no room for epilogue");
4517 MEM_writeLE32(op, cBlockHeader24);
4518 op += ZSTD_blockHeaderSize;
4519 dstCapacity -= ZSTD_blockHeaderSize;
4520 }
4521
4522 if (cctx->appliedParams.fParams.checksumFlag) {
4523 U32 const checksum = (U32) xxh64_digest(&cctx->xxhState);
4524 RETURN_ERROR_IF(dstCapacity<4, dstSize_tooSmall, "no room for checksum");
4525 DEBUGLOG(4, "ZSTD_writeEpilogue: write checksum : %08X", (unsigned)checksum);
4526 MEM_writeLE32(op, checksum);
4527 op += 4;
4528 }
4529
4530 cctx->stage = ZSTDcs_created; /* return to "created but no init" status */
4531 return op-ostart;
4532 }
4533
4534 void ZSTD_CCtx_trace(ZSTD_CCtx* cctx, size_t extraCSize)
4535 {
4536 (void)cctx;
4537 (void)extraCSize;
4538 }
4539
4540 size_t ZSTD_compressEnd (ZSTD_CCtx* cctx,
4541 void* dst, size_t dstCapacity,
4542 const void* src, size_t srcSize)
4543 {
4544 size_t endResult;
4545 size_t const cSize = ZSTD_compressContinue_internal(cctx,
4546 dst, dstCapacity, src, srcSize,
4547 1 /* frame mode */, 1 /* last chunk */);
4548 FORWARD_IF_ERROR(cSize, "ZSTD_compressContinue_internal failed");
4549 endResult = ZSTD_writeEpilogue(cctx, (char*)dst + cSize, dstCapacity-cSize);
4550 FORWARD_IF_ERROR(endResult, "ZSTD_writeEpilogue failed");
4551 assert(!(cctx->appliedParams.fParams.contentSizeFlag && cctx->pledgedSrcSizePlusOne == 0));
4552 if (cctx->pledgedSrcSizePlusOne != 0) { /* control src size */
4553 ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_UNKNOWN == (unsigned long long)-1);
4554 DEBUGLOG(4, "end of frame : controlling src size");
4555 RETURN_ERROR_IF(
4556 cctx->pledgedSrcSizePlusOne != cctx->consumedSrcSize+1,
4557 srcSize_wrong,
4558 "error : pledgedSrcSize = %u, while realSrcSize = %u",
4559 (unsigned)cctx->pledgedSrcSizePlusOne-1,
4560 (unsigned)cctx->consumedSrcSize);
4561 }
4562 ZSTD_CCtx_trace(cctx, endResult);
4563 return cSize + endResult;
4564 }
4565
4566 size_t ZSTD_compress_advanced (ZSTD_CCtx* cctx,
4567 void* dst, size_t dstCapacity,
4568 const void* src, size_t srcSize,
4569 const void* dict,size_t dictSize,
4570 ZSTD_parameters params)
4571 {
4572 DEBUGLOG(4, "ZSTD_compress_advanced");
4573 FORWARD_IF_ERROR(ZSTD_checkCParams(params.cParams), "");
4574 ZSTD_CCtxParams_init_internal(&cctx->simpleApiParams, ¶ms, ZSTD_NO_CLEVEL);
4575 return ZSTD_compress_advanced_internal(cctx,
4576 dst, dstCapacity,
4577 src, srcSize,
4578 dict, dictSize,
4579 &cctx->simpleApiParams);
4580 }
4581
4582 /* Internal */
4583 size_t ZSTD_compress_advanced_internal(
4584 ZSTD_CCtx* cctx,
4585 void* dst, size_t dstCapacity,
4586 const void* src, size_t srcSize,
4587 const void* dict,size_t dictSize,
4588 const ZSTD_CCtx_params* params)
4589 {
4590 DEBUGLOG(4, "ZSTD_compress_advanced_internal (srcSize:%u)", (unsigned)srcSize);
4591 FORWARD_IF_ERROR( ZSTD_compressBegin_internal(cctx,
4592 dict, dictSize, ZSTD_dct_auto, ZSTD_dtlm_fast, NULL,
4593 params, srcSize, ZSTDb_not_buffered) , "");
4594 return ZSTD_compressEnd(cctx, dst, dstCapacity, src, srcSize);
4595 }
4596
4597 size_t ZSTD_compress_usingDict(ZSTD_CCtx* cctx,
4598 void* dst, size_t dstCapacity,
4599 const void* src, size_t srcSize,
4600 const void* dict, size_t dictSize,
4601 int compressionLevel)
4602 {
4603 {
4604 ZSTD_parameters const params = ZSTD_getParams_internal(compressionLevel, srcSize, dict ? dictSize : 0, ZSTD_cpm_noAttachDict);
4605 assert(params.fParams.contentSizeFlag == 1);
4606 ZSTD_CCtxParams_init_internal(&cctx->simpleApiParams, ¶ms, (compressionLevel == 0) ? ZSTD_CLEVEL_DEFAULT: compressionLevel);
4607 }
4608 DEBUGLOG(4, "ZSTD_compress_usingDict (srcSize=%u)", (unsigned)srcSize);
4609 return ZSTD_compress_advanced_internal(cctx, dst, dstCapacity, src, srcSize, dict, dictSize, &cctx->simpleApiParams);
4610 }
4611
4612 size_t ZSTD_compressCCtx(ZSTD_CCtx* cctx,
4613 void* dst, size_t dstCapacity,
4614 const void* src, size_t srcSize,
4615 int compressionLevel)
4616 {
4617 DEBUGLOG(4, "ZSTD_compressCCtx (srcSize=%u)", (unsigned)srcSize);
4618 assert(cctx != NULL);
4619 return ZSTD_compress_usingDict(cctx, dst, dstCapacity, src, srcSize, NULL, 0, compressionLevel);
4620 }
4621
4622 size_t ZSTD_compress(void* dst, size_t dstCapacity,
4623 const void* src, size_t srcSize,
4624 int compressionLevel)
4625 {
4626 size_t result;
4627 ZSTD_CCtx* cctx = ZSTD_createCCtx();
4628 RETURN_ERROR_IF(!cctx, memory_allocation, "ZSTD_createCCtx failed");
4629 result = ZSTD_compressCCtx(cctx, dst, dstCapacity, src, srcSize, compressionLevel);
4630 ZSTD_freeCCtx(cctx);
4631 return result;
4632 }
4633
4634
4635 /* ===== Dictionary API ===== */
4636
4637 /*! ZSTD_estimateCDictSize_advanced() :
4638 * Estimate amount of memory that will be needed to create a dictionary with following arguments */
4639 size_t ZSTD_estimateCDictSize_advanced(
4640 size_t dictSize, ZSTD_compressionParameters cParams,
4641 ZSTD_dictLoadMethod_e dictLoadMethod)
4642 {
4643 DEBUGLOG(5, "sizeof(ZSTD_CDict) : %u", (unsigned)sizeof(ZSTD_CDict));
4644 return ZSTD_cwksp_alloc_size(sizeof(ZSTD_CDict))
4645 + ZSTD_cwksp_alloc_size(HUF_WORKSPACE_SIZE)
4646 /* enableDedicatedDictSearch == 1 ensures that CDict estimation will not be too small
4647 * in case we are using DDS with row-hash. */
4648 + ZSTD_sizeof_matchState(&cParams, ZSTD_resolveRowMatchFinderMode(ZSTD_ps_auto, &cParams),
4649 /* enableDedicatedDictSearch */ 1, /* forCCtx */ 0)
4650 + (dictLoadMethod == ZSTD_dlm_byRef ? 0
4651 : ZSTD_cwksp_alloc_size(ZSTD_cwksp_align(dictSize, sizeof(void *))));
4652 }
4653
4654 size_t ZSTD_estimateCDictSize(size_t dictSize, int compressionLevel)
4655 {
4656 ZSTD_compressionParameters const cParams = ZSTD_getCParams_internal(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_createCDict);
4657 return ZSTD_estimateCDictSize_advanced(dictSize, cParams, ZSTD_dlm_byCopy);
4658 }
4659
4660 size_t ZSTD_sizeof_CDict(const ZSTD_CDict* cdict)
4661 {
4662 if (cdict==NULL) return 0; /* support sizeof on NULL */
4663 DEBUGLOG(5, "sizeof(*cdict) : %u", (unsigned)sizeof(*cdict));
4664 /* cdict may be in the workspace */
4665 return (cdict->workspace.workspace == cdict ? 0 : sizeof(*cdict))
4666 + ZSTD_cwksp_sizeof(&cdict->workspace);
4667 }
4668
4669 static size_t ZSTD_initCDict_internal(
4670 ZSTD_CDict* cdict,
4671 const void* dictBuffer, size_t dictSize,
4672 ZSTD_dictLoadMethod_e dictLoadMethod,
4673 ZSTD_dictContentType_e dictContentType,
4674 ZSTD_CCtx_params params)
4675 {
4676 DEBUGLOG(3, "ZSTD_initCDict_internal (dictContentType:%u)", (unsigned)dictContentType);
4677 assert(!ZSTD_checkCParams(params.cParams));
4678 cdict->matchState.cParams = params.cParams;
4679 cdict->matchState.dedicatedDictSearch = params.enableDedicatedDictSearch;
4680 if ((dictLoadMethod == ZSTD_dlm_byRef) || (!dictBuffer) || (!dictSize)) {
4681 cdict->dictContent = dictBuffer;
4682 } else {
4683 void *internalBuffer = ZSTD_cwksp_reserve_object(&cdict->workspace, ZSTD_cwksp_align(dictSize, sizeof(void*)));
4684 RETURN_ERROR_IF(!internalBuffer, memory_allocation, "NULL pointer!");
4685 cdict->dictContent = internalBuffer;
4686 ZSTD_memcpy(internalBuffer, dictBuffer, dictSize);
4687 }
4688 cdict->dictContentSize = dictSize;
4689 cdict->dictContentType = dictContentType;
4690
4691 cdict->entropyWorkspace = (U32*)ZSTD_cwksp_reserve_object(&cdict->workspace, HUF_WORKSPACE_SIZE);
4692
4693
4694 /* Reset the state to no dictionary */
4695 ZSTD_reset_compressedBlockState(&cdict->cBlockState);
4696 FORWARD_IF_ERROR(ZSTD_reset_matchState(
4697 &cdict->matchState,
4698 &cdict->workspace,
4699 ¶ms.cParams,
4700 params.useRowMatchFinder,
4701 ZSTDcrp_makeClean,
4702 ZSTDirp_reset,
4703 ZSTD_resetTarget_CDict), "");
4704 /* (Maybe) load the dictionary
4705 * Skips loading the dictionary if it is < 8 bytes.
4706 */
4707 { params.compressionLevel = ZSTD_CLEVEL_DEFAULT;
4708 params.fParams.contentSizeFlag = 1;
4709 { size_t const dictID = ZSTD_compress_insertDictionary(
4710 &cdict->cBlockState, &cdict->matchState, NULL, &cdict->workspace,
4711 ¶ms, cdict->dictContent, cdict->dictContentSize,
4712 dictContentType, ZSTD_dtlm_full, cdict->entropyWorkspace);
4713 FORWARD_IF_ERROR(dictID, "ZSTD_compress_insertDictionary failed");
4714 assert(dictID <= (size_t)(U32)-1);
4715 cdict->dictID = (U32)dictID;
4716 }
4717 }
4718
4719 return 0;
4720 }
4721
4722 static ZSTD_CDict* ZSTD_createCDict_advanced_internal(size_t dictSize,
4723 ZSTD_dictLoadMethod_e dictLoadMethod,
4724 ZSTD_compressionParameters cParams,
4725 ZSTD_paramSwitch_e useRowMatchFinder,
4726 U32 enableDedicatedDictSearch,
4727 ZSTD_customMem customMem)
4728 {
4729 if ((!customMem.customAlloc) ^ (!customMem.customFree)) return NULL;
4730
4731 { size_t const workspaceSize =
4732 ZSTD_cwksp_alloc_size(sizeof(ZSTD_CDict)) +
4733 ZSTD_cwksp_alloc_size(HUF_WORKSPACE_SIZE) +
4734 ZSTD_sizeof_matchState(&cParams, useRowMatchFinder, enableDedicatedDictSearch, /* forCCtx */ 0) +
4735 (dictLoadMethod == ZSTD_dlm_byRef ? 0
4736 : ZSTD_cwksp_alloc_size(ZSTD_cwksp_align(dictSize, sizeof(void*))));
4737 void* const workspace = ZSTD_customMalloc(workspaceSize, customMem);
4738 ZSTD_cwksp ws;
4739 ZSTD_CDict* cdict;
4740
4741 if (!workspace) {
4742 ZSTD_customFree(workspace, customMem);
4743 return NULL;
4744 }
4745
4746 ZSTD_cwksp_init(&ws, workspace, workspaceSize, ZSTD_cwksp_dynamic_alloc);
4747
4748 cdict = (ZSTD_CDict*)ZSTD_cwksp_reserve_object(&ws, sizeof(ZSTD_CDict));
4749 assert(cdict != NULL);
4750 ZSTD_cwksp_move(&cdict->workspace, &ws);
4751 cdict->customMem = customMem;
4752 cdict->compressionLevel = ZSTD_NO_CLEVEL; /* signals advanced API usage */
4753 cdict->useRowMatchFinder = useRowMatchFinder;
4754 return cdict;
4755 }
4756 }
4757
4758 ZSTD_CDict* ZSTD_createCDict_advanced(const void* dictBuffer, size_t dictSize,
4759 ZSTD_dictLoadMethod_e dictLoadMethod,
4760 ZSTD_dictContentType_e dictContentType,
4761 ZSTD_compressionParameters cParams,
4762 ZSTD_customMem customMem)
4763 {
4764 ZSTD_CCtx_params cctxParams;
4765 ZSTD_memset(&cctxParams, 0, sizeof(cctxParams));
4766 ZSTD_CCtxParams_init(&cctxParams, 0);
4767 cctxParams.cParams = cParams;
4768 cctxParams.customMem = customMem;
4769 return ZSTD_createCDict_advanced2(
4770 dictBuffer, dictSize,
4771 dictLoadMethod, dictContentType,
4772 &cctxParams, customMem);
4773 }
4774
4775 ZSTD_CDict* ZSTD_createCDict_advanced2(
4776 const void* dict, size_t dictSize,
4777 ZSTD_dictLoadMethod_e dictLoadMethod,
4778 ZSTD_dictContentType_e dictContentType,
4779 const ZSTD_CCtx_params* originalCctxParams,
4780 ZSTD_customMem customMem)
4781 {
4782 ZSTD_CCtx_params cctxParams = *originalCctxParams;
4783 ZSTD_compressionParameters cParams;
4784 ZSTD_CDict* cdict;
4785
4786 DEBUGLOG(3, "ZSTD_createCDict_advanced2, mode %u", (unsigned)dictContentType);
4787 if (!customMem.customAlloc ^ !customMem.customFree) return NULL;
4788
4789 if (cctxParams.enableDedicatedDictSearch) {
4790 cParams = ZSTD_dedicatedDictSearch_getCParams(
4791 cctxParams.compressionLevel, dictSize);
4792 ZSTD_overrideCParams(&cParams, &cctxParams.cParams);
4793 } else {
4794 cParams = ZSTD_getCParamsFromCCtxParams(
4795 &cctxParams, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_createCDict);
4796 }
4797
4798 if (!ZSTD_dedicatedDictSearch_isSupported(&cParams)) {
4799 /* Fall back to non-DDSS params */
4800 cctxParams.enableDedicatedDictSearch = 0;
4801 cParams = ZSTD_getCParamsFromCCtxParams(
4802 &cctxParams, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_createCDict);
4803 }
4804
4805 DEBUGLOG(3, "ZSTD_createCDict_advanced2: DDS: %u", cctxParams.enableDedicatedDictSearch);
4806 cctxParams.cParams = cParams;
4807 cctxParams.useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(cctxParams.useRowMatchFinder, &cParams);
4808
4809 cdict = ZSTD_createCDict_advanced_internal(dictSize,
4810 dictLoadMethod, cctxParams.cParams,
4811 cctxParams.useRowMatchFinder, cctxParams.enableDedicatedDictSearch,
4812 customMem);
4813
4814 if (ZSTD_isError( ZSTD_initCDict_internal(cdict,
4815 dict, dictSize,
4816 dictLoadMethod, dictContentType,
4817 cctxParams) )) {
4818 ZSTD_freeCDict(cdict);
4819 return NULL;
4820 }
4821
4822 return cdict;
4823 }
4824
4825 ZSTD_CDict* ZSTD_createCDict(const void* dict, size_t dictSize, int compressionLevel)
4826 {
4827 ZSTD_compressionParameters cParams = ZSTD_getCParams_internal(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_createCDict);
4828 ZSTD_CDict* const cdict = ZSTD_createCDict_advanced(dict, dictSize,
4829 ZSTD_dlm_byCopy, ZSTD_dct_auto,
4830 cParams, ZSTD_defaultCMem);
4831 if (cdict)
4832 cdict->compressionLevel = (compressionLevel == 0) ? ZSTD_CLEVEL_DEFAULT : compressionLevel;
4833 return cdict;
4834 }
4835
4836 ZSTD_CDict* ZSTD_createCDict_byReference(const void* dict, size_t dictSize, int compressionLevel)
4837 {
4838 ZSTD_compressionParameters cParams = ZSTD_getCParams_internal(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_createCDict);
4839 ZSTD_CDict* const cdict = ZSTD_createCDict_advanced(dict, dictSize,
4840 ZSTD_dlm_byRef, ZSTD_dct_auto,
4841 cParams, ZSTD_defaultCMem);
4842 if (cdict)
4843 cdict->compressionLevel = (compressionLevel == 0) ? ZSTD_CLEVEL_DEFAULT : compressionLevel;
4844 return cdict;
4845 }
4846
4847 size_t ZSTD_freeCDict(ZSTD_CDict* cdict)
4848 {
4849 if (cdict==NULL) return 0; /* support free on NULL */
4850 { ZSTD_customMem const cMem = cdict->customMem;
4851 int cdictInWorkspace = ZSTD_cwksp_owns_buffer(&cdict->workspace, cdict);
4852 ZSTD_cwksp_free(&cdict->workspace, cMem);
4853 if (!cdictInWorkspace) {
4854 ZSTD_customFree(cdict, cMem);
4855 }
4856 return 0;
4857 }
4858 }
4859
4860 /*! ZSTD_initStaticCDict_advanced() :
4861 * Generate a digested dictionary in provided memory area.
4862 * workspace: The memory area to emplace the dictionary into.
4863 * Provided pointer must 8-bytes aligned.
4864 * It must outlive dictionary usage.
4865 * workspaceSize: Use ZSTD_estimateCDictSize()
4866 * to determine how large workspace must be.
4867 * cParams : use ZSTD_getCParams() to transform a compression level
4868 * into its relevants cParams.
4869 * @return : pointer to ZSTD_CDict*, or NULL if error (size too small)
4870 * Note : there is no corresponding "free" function.
4871 * Since workspace was allocated externally, it must be freed externally.
4872 */
4873 const ZSTD_CDict* ZSTD_initStaticCDict(
4874 void* workspace, size_t workspaceSize,
4875 const void* dict, size_t dictSize,
4876 ZSTD_dictLoadMethod_e dictLoadMethod,
4877 ZSTD_dictContentType_e dictContentType,
4878 ZSTD_compressionParameters cParams)
4879 {
4880 ZSTD_paramSwitch_e const useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(ZSTD_ps_auto, &cParams);
4881 /* enableDedicatedDictSearch == 1 ensures matchstate is not too small in case this CDict will be used for DDS + row hash */
4882 size_t const matchStateSize = ZSTD_sizeof_matchState(&cParams, useRowMatchFinder, /* enableDedicatedDictSearch */ 1, /* forCCtx */ 0);
4883 size_t const neededSize = ZSTD_cwksp_alloc_size(sizeof(ZSTD_CDict))
4884 + (dictLoadMethod == ZSTD_dlm_byRef ? 0
4885 : ZSTD_cwksp_alloc_size(ZSTD_cwksp_align(dictSize, sizeof(void*))))
4886 + ZSTD_cwksp_alloc_size(HUF_WORKSPACE_SIZE)
4887 + matchStateSize;
4888 ZSTD_CDict* cdict;
4889 ZSTD_CCtx_params params;
4890
4891 if ((size_t)workspace & 7) return NULL; /* 8-aligned */
4892
4893 {
4894 ZSTD_cwksp ws;
4895 ZSTD_cwksp_init(&ws, workspace, workspaceSize, ZSTD_cwksp_static_alloc);
4896 cdict = (ZSTD_CDict*)ZSTD_cwksp_reserve_object(&ws, sizeof(ZSTD_CDict));
4897 if (cdict == NULL) return NULL;
4898 ZSTD_cwksp_move(&cdict->workspace, &ws);
4899 }
4900
4901 DEBUGLOG(4, "(workspaceSize < neededSize) : (%u < %u) => %u",
4902 (unsigned)workspaceSize, (unsigned)neededSize, (unsigned)(workspaceSize < neededSize));
4903 if (workspaceSize < neededSize) return NULL;
4904
4905 ZSTD_CCtxParams_init(¶ms, 0);
4906 params.cParams = cParams;
4907 params.useRowMatchFinder = useRowMatchFinder;
4908 cdict->useRowMatchFinder = useRowMatchFinder;
4909
4910 if (ZSTD_isError( ZSTD_initCDict_internal(cdict,
4911 dict, dictSize,
4912 dictLoadMethod, dictContentType,
4913 params) ))
4914 return NULL;
4915
4916 return cdict;
4917 }
4918
4919 ZSTD_compressionParameters ZSTD_getCParamsFromCDict(const ZSTD_CDict* cdict)
4920 {
4921 assert(cdict != NULL);
4922 return cdict->matchState.cParams;
4923 }
4924
4925 /*! ZSTD_getDictID_fromCDict() :
4926 * Provides the dictID of the dictionary loaded into `cdict`.
4927 * If @return == 0, the dictionary is not conformant to Zstandard specification, or empty.
4928 * Non-conformant dictionaries can still be loaded, but as content-only dictionaries. */
4929 unsigned ZSTD_getDictID_fromCDict(const ZSTD_CDict* cdict)
4930 {
4931 if (cdict==NULL) return 0;
4932 return cdict->dictID;
4933 }
4934
4935 /* ZSTD_compressBegin_usingCDict_internal() :
4936 * Implementation of various ZSTD_compressBegin_usingCDict* functions.
4937 */
4938 static size_t ZSTD_compressBegin_usingCDict_internal(
4939 ZSTD_CCtx* const cctx, const ZSTD_CDict* const cdict,
4940 ZSTD_frameParameters const fParams, unsigned long long const pledgedSrcSize)
4941 {
4942 ZSTD_CCtx_params cctxParams;
4943 DEBUGLOG(4, "ZSTD_compressBegin_usingCDict_internal");
4944 RETURN_ERROR_IF(cdict==NULL, dictionary_wrong, "NULL pointer!");
4945 /* Initialize the cctxParams from the cdict */
4946 {
4947 ZSTD_parameters params;
4948 params.fParams = fParams;
4949 params.cParams = ( pledgedSrcSize < ZSTD_USE_CDICT_PARAMS_SRCSIZE_CUTOFF
4950 || pledgedSrcSize < cdict->dictContentSize * ZSTD_USE_CDICT_PARAMS_DICTSIZE_MULTIPLIER
4951 || pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN
4952 || cdict->compressionLevel == 0 ) ?
4953 ZSTD_getCParamsFromCDict(cdict)
4954 : ZSTD_getCParams(cdict->compressionLevel,
4955 pledgedSrcSize,
4956 cdict->dictContentSize);
4957 ZSTD_CCtxParams_init_internal(&cctxParams, ¶ms, cdict->compressionLevel);
4958 }
4959 /* Increase window log to fit the entire dictionary and source if the
4960 * source size is known. Limit the increase to 19, which is the
4961 * window log for compression level 1 with the largest source size.
4962 */
4963 if (pledgedSrcSize != ZSTD_CONTENTSIZE_UNKNOWN) {
4964 U32 const limitedSrcSize = (U32)MIN(pledgedSrcSize, 1U << 19);
4965 U32 const limitedSrcLog = limitedSrcSize > 1 ? ZSTD_highbit32(limitedSrcSize - 1) + 1 : 1;
4966 cctxParams.cParams.windowLog = MAX(cctxParams.cParams.windowLog, limitedSrcLog);
4967 }
4968 return ZSTD_compressBegin_internal(cctx,
4969 NULL, 0, ZSTD_dct_auto, ZSTD_dtlm_fast,
4970 cdict,
4971 &cctxParams, pledgedSrcSize,
4972 ZSTDb_not_buffered);
4973 }
4974
4975
4976 /* ZSTD_compressBegin_usingCDict_advanced() :
4977 * This function is DEPRECATED.
4978 * cdict must be != NULL */
4979 size_t ZSTD_compressBegin_usingCDict_advanced(
4980 ZSTD_CCtx* const cctx, const ZSTD_CDict* const cdict,
4981 ZSTD_frameParameters const fParams, unsigned long long const pledgedSrcSize)
4982 {
4983 return ZSTD_compressBegin_usingCDict_internal(cctx, cdict, fParams, pledgedSrcSize);
4984 }
4985
4986 /* ZSTD_compressBegin_usingCDict() :
4987 * cdict must be != NULL */
4988 size_t ZSTD_compressBegin_usingCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict)
4989 {
4990 ZSTD_frameParameters const fParams = { 0 /*content*/, 0 /*checksum*/, 0 /*noDictID*/ };
4991 return ZSTD_compressBegin_usingCDict_internal(cctx, cdict, fParams, ZSTD_CONTENTSIZE_UNKNOWN);
4992 }
4993
4994 /*! ZSTD_compress_usingCDict_internal():
4995 * Implementation of various ZSTD_compress_usingCDict* functions.
4996 */
4997 static size_t ZSTD_compress_usingCDict_internal(ZSTD_CCtx* cctx,
4998 void* dst, size_t dstCapacity,
4999 const void* src, size_t srcSize,
5000 const ZSTD_CDict* cdict, ZSTD_frameParameters fParams)
5001 {
5002 FORWARD_IF_ERROR(ZSTD_compressBegin_usingCDict_internal(cctx, cdict, fParams, srcSize), ""); /* will check if cdict != NULL */
5003 return ZSTD_compressEnd(cctx, dst, dstCapacity, src, srcSize);
5004 }
5005
5006 /*! ZSTD_compress_usingCDict_advanced():
5007 * This function is DEPRECATED.
5008 */
5009 size_t ZSTD_compress_usingCDict_advanced(ZSTD_CCtx* cctx,
5010 void* dst, size_t dstCapacity,
5011 const void* src, size_t srcSize,
5012 const ZSTD_CDict* cdict, ZSTD_frameParameters fParams)
5013 {
5014 return ZSTD_compress_usingCDict_internal(cctx, dst, dstCapacity, src, srcSize, cdict, fParams);
5015 }
5016
5017 /*! ZSTD_compress_usingCDict() :
5018 * Compression using a digested Dictionary.
5019 * Faster startup than ZSTD_compress_usingDict(), recommended when same dictionary is used multiple times.
5020 * Note that compression parameters are decided at CDict creation time
5021 * while frame parameters are hardcoded */
5022 size_t ZSTD_compress_usingCDict(ZSTD_CCtx* cctx,
5023 void* dst, size_t dstCapacity,
5024 const void* src, size_t srcSize,
5025 const ZSTD_CDict* cdict)
5026 {
5027 ZSTD_frameParameters const fParams = { 1 /*content*/, 0 /*checksum*/, 0 /*noDictID*/ };
5028 return ZSTD_compress_usingCDict_internal(cctx, dst, dstCapacity, src, srcSize, cdict, fParams);
5029 }
5030
5031
5032
5033 /* ******************************************************************
5034 * Streaming
5035 ********************************************************************/
5036
5037 ZSTD_CStream* ZSTD_createCStream(void)
5038 {
5039 DEBUGLOG(3, "ZSTD_createCStream");
5040 return ZSTD_createCStream_advanced(ZSTD_defaultCMem);
5041 }
5042
5043 ZSTD_CStream* ZSTD_initStaticCStream(void *workspace, size_t workspaceSize)
5044 {
5045 return ZSTD_initStaticCCtx(workspace, workspaceSize);
5046 }
5047
5048 ZSTD_CStream* ZSTD_createCStream_advanced(ZSTD_customMem customMem)
5049 { /* CStream and CCtx are now same object */
5050 return ZSTD_createCCtx_advanced(customMem);
5051 }
5052
5053 size_t ZSTD_freeCStream(ZSTD_CStream* zcs)
5054 {
5055 return ZSTD_freeCCtx(zcs); /* same object */
5056 }
5057
5058
5059
5060 /*====== Initialization ======*/
5061
5062 size_t ZSTD_CStreamInSize(void) { return ZSTD_BLOCKSIZE_MAX; }
5063
5064 size_t ZSTD_CStreamOutSize(void)
5065 {
5066 return ZSTD_compressBound(ZSTD_BLOCKSIZE_MAX) + ZSTD_blockHeaderSize + 4 /* 32-bits hash */ ;
5067 }
5068
5069 static ZSTD_cParamMode_e ZSTD_getCParamMode(ZSTD_CDict const* cdict, ZSTD_CCtx_params const* params, U64 pledgedSrcSize)
5070 {
5071 if (cdict != NULL && ZSTD_shouldAttachDict(cdict, params, pledgedSrcSize))
5072 return ZSTD_cpm_attachDict;
5073 else
5074 return ZSTD_cpm_noAttachDict;
5075 }
5076
5077 /* ZSTD_resetCStream():
5078 * pledgedSrcSize == 0 means "unknown" */
5079 size_t ZSTD_resetCStream(ZSTD_CStream* zcs, unsigned long long pss)
5080 {
5081 /* temporary : 0 interpreted as "unknown" during transition period.
5082 * Users willing to specify "unknown" **must** use ZSTD_CONTENTSIZE_UNKNOWN.
5083 * 0 will be interpreted as "empty" in the future.
5084 */
5085 U64 const pledgedSrcSize = (pss==0) ? ZSTD_CONTENTSIZE_UNKNOWN : pss;
5086 DEBUGLOG(4, "ZSTD_resetCStream: pledgedSrcSize = %u", (unsigned)pledgedSrcSize);
5087 FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
5088 FORWARD_IF_ERROR( ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize) , "");
5089 return 0;
5090 }
5091
5092 /*! ZSTD_initCStream_internal() :
5093 * Note : for lib/compress only. Used by zstdmt_compress.c.
5094 * Assumption 1 : params are valid
5095 * Assumption 2 : either dict, or cdict, is defined, not both */
5096 size_t ZSTD_initCStream_internal(ZSTD_CStream* zcs,
5097 const void* dict, size_t dictSize, const ZSTD_CDict* cdict,
5098 const ZSTD_CCtx_params* params,
5099 unsigned long long pledgedSrcSize)
5100 {
5101 DEBUGLOG(4, "ZSTD_initCStream_internal");
5102 FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
5103 FORWARD_IF_ERROR( ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize) , "");
5104 assert(!ZSTD_isError(ZSTD_checkCParams(params->cParams)));
5105 zcs->requestedParams = *params;
5106 assert(!((dict) && (cdict))); /* either dict or cdict, not both */
5107 if (dict) {
5108 FORWARD_IF_ERROR( ZSTD_CCtx_loadDictionary(zcs, dict, dictSize) , "");
5109 } else {
5110 /* Dictionary is cleared if !cdict */
5111 FORWARD_IF_ERROR( ZSTD_CCtx_refCDict(zcs, cdict) , "");
5112 }
5113 return 0;
5114 }
5115
5116 /* ZSTD_initCStream_usingCDict_advanced() :
5117 * same as ZSTD_initCStream_usingCDict(), with control over frame parameters */
5118 size_t ZSTD_initCStream_usingCDict_advanced(ZSTD_CStream* zcs,
5119 const ZSTD_CDict* cdict,
5120 ZSTD_frameParameters fParams,
5121 unsigned long long pledgedSrcSize)
5122 {
5123 DEBUGLOG(4, "ZSTD_initCStream_usingCDict_advanced");
5124 FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
5125 FORWARD_IF_ERROR( ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize) , "");
5126 zcs->requestedParams.fParams = fParams;
5127 FORWARD_IF_ERROR( ZSTD_CCtx_refCDict(zcs, cdict) , "");
5128 return 0;
5129 }
5130
5131 /* note : cdict must outlive compression session */
5132 size_t ZSTD_initCStream_usingCDict(ZSTD_CStream* zcs, const ZSTD_CDict* cdict)
5133 {
5134 DEBUGLOG(4, "ZSTD_initCStream_usingCDict");
5135 FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
5136 FORWARD_IF_ERROR( ZSTD_CCtx_refCDict(zcs, cdict) , "");
5137 return 0;
5138 }
5139
5140
5141 /* ZSTD_initCStream_advanced() :
5142 * pledgedSrcSize must be exact.
5143 * if srcSize is not known at init time, use value ZSTD_CONTENTSIZE_UNKNOWN.
5144 * dict is loaded with default parameters ZSTD_dct_auto and ZSTD_dlm_byCopy. */
5145 size_t ZSTD_initCStream_advanced(ZSTD_CStream* zcs,
5146 const void* dict, size_t dictSize,
5147 ZSTD_parameters params, unsigned long long pss)
5148 {
5149 /* for compatibility with older programs relying on this behavior.
5150 * Users should now specify ZSTD_CONTENTSIZE_UNKNOWN.
5151 * This line will be removed in the future.
5152 */
5153 U64 const pledgedSrcSize = (pss==0 && params.fParams.contentSizeFlag==0) ? ZSTD_CONTENTSIZE_UNKNOWN : pss;
5154 DEBUGLOG(4, "ZSTD_initCStream_advanced");
5155 FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
5156 FORWARD_IF_ERROR( ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize) , "");
5157 FORWARD_IF_ERROR( ZSTD_checkCParams(params.cParams) , "");
5158 ZSTD_CCtxParams_setZstdParams(&zcs->requestedParams, ¶ms);
5159 FORWARD_IF_ERROR( ZSTD_CCtx_loadDictionary(zcs, dict, dictSize) , "");
5160 return 0;
5161 }
5162
5163 size_t ZSTD_initCStream_usingDict(ZSTD_CStream* zcs, const void* dict, size_t dictSize, int compressionLevel)
5164 {
5165 DEBUGLOG(4, "ZSTD_initCStream_usingDict");
5166 FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
5167 FORWARD_IF_ERROR( ZSTD_CCtx_setParameter(zcs, ZSTD_c_compressionLevel, compressionLevel) , "");
5168 FORWARD_IF_ERROR( ZSTD_CCtx_loadDictionary(zcs, dict, dictSize) , "");
5169 return 0;
5170 }
5171
5172 size_t ZSTD_initCStream_srcSize(ZSTD_CStream* zcs, int compressionLevel, unsigned long long pss)
5173 {
5174 /* temporary : 0 interpreted as "unknown" during transition period.
5175 * Users willing to specify "unknown" **must** use ZSTD_CONTENTSIZE_UNKNOWN.
5176 * 0 will be interpreted as "empty" in the future.
5177 */
5178 U64 const pledgedSrcSize = (pss==0) ? ZSTD_CONTENTSIZE_UNKNOWN : pss;
5179 DEBUGLOG(4, "ZSTD_initCStream_srcSize");
5180 FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
5181 FORWARD_IF_ERROR( ZSTD_CCtx_refCDict(zcs, NULL) , "");
5182 FORWARD_IF_ERROR( ZSTD_CCtx_setParameter(zcs, ZSTD_c_compressionLevel, compressionLevel) , "");
5183 FORWARD_IF_ERROR( ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize) , "");
5184 return 0;
5185 }
5186
5187 size_t ZSTD_initCStream(ZSTD_CStream* zcs, int compressionLevel)
5188 {
5189 DEBUGLOG(4, "ZSTD_initCStream");
5190 FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
5191 FORWARD_IF_ERROR( ZSTD_CCtx_refCDict(zcs, NULL) , "");
5192 FORWARD_IF_ERROR( ZSTD_CCtx_setParameter(zcs, ZSTD_c_compressionLevel, compressionLevel) , "");
5193 return 0;
5194 }
5195
5196 /*====== Compression ======*/
5197
5198 static size_t ZSTD_nextInputSizeHint(const ZSTD_CCtx* cctx)
5199 {
5200 size_t hintInSize = cctx->inBuffTarget - cctx->inBuffPos;
5201 if (hintInSize==0) hintInSize = cctx->blockSize;
5202 return hintInSize;
5203 }
5204
5205 /* ZSTD_compressStream_generic():
5206 * internal function for all *compressStream*() variants
5207 * non-static, because can be called from zstdmt_compress.c
5208 * @return : hint size for next input */
5209 static size_t ZSTD_compressStream_generic(ZSTD_CStream* zcs,
5210 ZSTD_outBuffer* output,
5211 ZSTD_inBuffer* input,
5212 ZSTD_EndDirective const flushMode)
5213 {
5214 const char* const istart = (const char*)input->src;
5215 const char* const iend = input->size != 0 ? istart + input->size : istart;
5216 const char* ip = input->pos != 0 ? istart + input->pos : istart;
5217 char* const ostart = (char*)output->dst;
5218 char* const oend = output->size != 0 ? ostart + output->size : ostart;
5219 char* op = output->pos != 0 ? ostart + output->pos : ostart;
5220 U32 someMoreWork = 1;
5221
5222 /* check expectations */
5223 DEBUGLOG(5, "ZSTD_compressStream_generic, flush=%u", (unsigned)flushMode);
5224 if (zcs->appliedParams.inBufferMode == ZSTD_bm_buffered) {
5225 assert(zcs->inBuff != NULL);
5226 assert(zcs->inBuffSize > 0);
5227 }
5228 if (zcs->appliedParams.outBufferMode == ZSTD_bm_buffered) {
5229 assert(zcs->outBuff != NULL);
5230 assert(zcs->outBuffSize > 0);
5231 }
5232 assert(output->pos <= output->size);
5233 assert(input->pos <= input->size);
5234 assert((U32)flushMode <= (U32)ZSTD_e_end);
5235
5236 while (someMoreWork) {
5237 switch(zcs->streamStage)
5238 {
5239 case zcss_init:
5240 RETURN_ERROR(init_missing, "call ZSTD_initCStream() first!");
5241
5242 case zcss_load:
5243 if ( (flushMode == ZSTD_e_end)
5244 && ( (size_t)(oend-op) >= ZSTD_compressBound(iend-ip) /* Enough output space */
5245 || zcs->appliedParams.outBufferMode == ZSTD_bm_stable) /* OR we are allowed to return dstSizeTooSmall */
5246 && (zcs->inBuffPos == 0) ) {
5247 /* shortcut to compression pass directly into output buffer */
5248 size_t const cSize = ZSTD_compressEnd(zcs,
5249 op, oend-op, ip, iend-ip);
5250 DEBUGLOG(4, "ZSTD_compressEnd : cSize=%u", (unsigned)cSize);
5251 FORWARD_IF_ERROR(cSize, "ZSTD_compressEnd failed");
5252 ip = iend;
5253 op += cSize;
5254 zcs->frameEnded = 1;
5255 ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only);
5256 someMoreWork = 0; break;
5257 }
5258 /* complete loading into inBuffer in buffered mode */
5259 if (zcs->appliedParams.inBufferMode == ZSTD_bm_buffered) {
5260 size_t const toLoad = zcs->inBuffTarget - zcs->inBuffPos;
5261 size_t const loaded = ZSTD_limitCopy(
5262 zcs->inBuff + zcs->inBuffPos, toLoad,
5263 ip, iend-ip);
5264 zcs->inBuffPos += loaded;
5265 if (loaded != 0)
5266 ip += loaded;
5267 if ( (flushMode == ZSTD_e_continue)
5268 && (zcs->inBuffPos < zcs->inBuffTarget) ) {
5269 /* not enough input to fill full block : stop here */
5270 someMoreWork = 0; break;
5271 }
5272 if ( (flushMode == ZSTD_e_flush)
5273 && (zcs->inBuffPos == zcs->inToCompress) ) {
5274 /* empty */
5275 someMoreWork = 0; break;
5276 }
5277 }
5278 /* compress current block (note : this stage cannot be stopped in the middle) */
5279 DEBUGLOG(5, "stream compression stage (flushMode==%u)", flushMode);
5280 { int const inputBuffered = (zcs->appliedParams.inBufferMode == ZSTD_bm_buffered);
5281 void* cDst;
5282 size_t cSize;
5283 size_t oSize = oend-op;
5284 size_t const iSize = inputBuffered
5285 ? zcs->inBuffPos - zcs->inToCompress
5286 : MIN((size_t)(iend - ip), zcs->blockSize);
5287 if (oSize >= ZSTD_compressBound(iSize) || zcs->appliedParams.outBufferMode == ZSTD_bm_stable)
5288 cDst = op; /* compress into output buffer, to skip flush stage */
5289 else
5290 cDst = zcs->outBuff, oSize = zcs->outBuffSize;
5291 if (inputBuffered) {
5292 unsigned const lastBlock = (flushMode == ZSTD_e_end) && (ip==iend);
5293 cSize = lastBlock ?
5294 ZSTD_compressEnd(zcs, cDst, oSize,
5295 zcs->inBuff + zcs->inToCompress, iSize) :
5296 ZSTD_compressContinue(zcs, cDst, oSize,
5297 zcs->inBuff + zcs->inToCompress, iSize);
5298 FORWARD_IF_ERROR(cSize, "%s", lastBlock ? "ZSTD_compressEnd failed" : "ZSTD_compressContinue failed");
5299 zcs->frameEnded = lastBlock;
5300 /* prepare next block */
5301 zcs->inBuffTarget = zcs->inBuffPos + zcs->blockSize;
5302 if (zcs->inBuffTarget > zcs->inBuffSize)
5303 zcs->inBuffPos = 0, zcs->inBuffTarget = zcs->blockSize;
5304 DEBUGLOG(5, "inBuffTarget:%u / inBuffSize:%u",
5305 (unsigned)zcs->inBuffTarget, (unsigned)zcs->inBuffSize);
5306 if (!lastBlock)
5307 assert(zcs->inBuffTarget <= zcs->inBuffSize);
5308 zcs->inToCompress = zcs->inBuffPos;
5309 } else {
5310 unsigned const lastBlock = (ip + iSize == iend);
5311 assert(flushMode == ZSTD_e_end /* Already validated */);
5312 cSize = lastBlock ?
5313 ZSTD_compressEnd(zcs, cDst, oSize, ip, iSize) :
5314 ZSTD_compressContinue(zcs, cDst, oSize, ip, iSize);
5315 /* Consume the input prior to error checking to mirror buffered mode. */
5316 if (iSize > 0)
5317 ip += iSize;
5318 FORWARD_IF_ERROR(cSize, "%s", lastBlock ? "ZSTD_compressEnd failed" : "ZSTD_compressContinue failed");
5319 zcs->frameEnded = lastBlock;
5320 if (lastBlock)
5321 assert(ip == iend);
5322 }
5323 if (cDst == op) { /* no need to flush */
5324 op += cSize;
5325 if (zcs->frameEnded) {
5326 DEBUGLOG(5, "Frame completed directly in outBuffer");
5327 someMoreWork = 0;
5328 ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only);
5329 }
5330 break;
5331 }
5332 zcs->outBuffContentSize = cSize;
5333 zcs->outBuffFlushedSize = 0;
5334 zcs->streamStage = zcss_flush; /* pass-through to flush stage */
5335 }
5336 ZSTD_FALLTHROUGH;
5337 case zcss_flush:
5338 DEBUGLOG(5, "flush stage");
5339 assert(zcs->appliedParams.outBufferMode == ZSTD_bm_buffered);
5340 { size_t const toFlush = zcs->outBuffContentSize - zcs->outBuffFlushedSize;
5341 size_t const flushed = ZSTD_limitCopy(op, (size_t)(oend-op),
5342 zcs->outBuff + zcs->outBuffFlushedSize, toFlush);
5343 DEBUGLOG(5, "toFlush: %u into %u ==> flushed: %u",
5344 (unsigned)toFlush, (unsigned)(oend-op), (unsigned)flushed);
5345 if (flushed)
5346 op += flushed;
5347 zcs->outBuffFlushedSize += flushed;
5348 if (toFlush!=flushed) {
5349 /* flush not fully completed, presumably because dst is too small */
5350 assert(op==oend);
5351 someMoreWork = 0;
5352 break;
5353 }
5354 zcs->outBuffContentSize = zcs->outBuffFlushedSize = 0;
5355 if (zcs->frameEnded) {
5356 DEBUGLOG(5, "Frame completed on flush");
5357 someMoreWork = 0;
5358 ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only);
5359 break;
5360 }
5361 zcs->streamStage = zcss_load;
5362 break;
5363 }
5364
5365 default: /* impossible */
5366 assert(0);
5367 }
5368 }
5369
5370 input->pos = ip - istart;
5371 output->pos = op - ostart;
5372 if (zcs->frameEnded) return 0;
5373 return ZSTD_nextInputSizeHint(zcs);
5374 }
5375
5376 static size_t ZSTD_nextInputSizeHint_MTorST(const ZSTD_CCtx* cctx)
5377 {
5378 return ZSTD_nextInputSizeHint(cctx);
5379
5380 }
5381
5382 size_t ZSTD_compressStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output, ZSTD_inBuffer* input)
5383 {
5384 FORWARD_IF_ERROR( ZSTD_compressStream2(zcs, output, input, ZSTD_e_continue) , "");
5385 return ZSTD_nextInputSizeHint_MTorST(zcs);
5386 }
5387
5388 /* After a compression call set the expected input/output buffer.
5389 * This is validated at the start of the next compression call.
5390 */
5391 static void ZSTD_setBufferExpectations(ZSTD_CCtx* cctx, ZSTD_outBuffer const* output, ZSTD_inBuffer const* input)
5392 {
5393 if (cctx->appliedParams.inBufferMode == ZSTD_bm_stable) {
5394 cctx->expectedInBuffer = *input;
5395 }
5396 if (cctx->appliedParams.outBufferMode == ZSTD_bm_stable) {
5397 cctx->expectedOutBufferSize = output->size - output->pos;
5398 }
5399 }
5400
5401 /* Validate that the input/output buffers match the expectations set by
5402 * ZSTD_setBufferExpectations.
5403 */
5404 static size_t ZSTD_checkBufferStability(ZSTD_CCtx const* cctx,
5405 ZSTD_outBuffer const* output,
5406 ZSTD_inBuffer const* input,
5407 ZSTD_EndDirective endOp)
5408 {
5409 if (cctx->appliedParams.inBufferMode == ZSTD_bm_stable) {
5410 ZSTD_inBuffer const expect = cctx->expectedInBuffer;
5411 if (expect.src != input->src || expect.pos != input->pos || expect.size != input->size)
5412 RETURN_ERROR(srcBuffer_wrong, "ZSTD_c_stableInBuffer enabled but input differs!");
5413 if (endOp != ZSTD_e_end)
5414 RETURN_ERROR(srcBuffer_wrong, "ZSTD_c_stableInBuffer can only be used with ZSTD_e_end!");
5415 }
5416 if (cctx->appliedParams.outBufferMode == ZSTD_bm_stable) {
5417 size_t const outBufferSize = output->size - output->pos;
5418 if (cctx->expectedOutBufferSize != outBufferSize)
5419 RETURN_ERROR(dstBuffer_wrong, "ZSTD_c_stableOutBuffer enabled but output size differs!");
5420 }
5421 return 0;
5422 }
5423
5424 static size_t ZSTD_CCtx_init_compressStream2(ZSTD_CCtx* cctx,
5425 ZSTD_EndDirective endOp,
5426 size_t inSize) {
5427 ZSTD_CCtx_params params = cctx->requestedParams;
5428 ZSTD_prefixDict const prefixDict = cctx->prefixDict;
5429 FORWARD_IF_ERROR( ZSTD_initLocalDict(cctx) , ""); /* Init the local dict if present. */
5430 ZSTD_memset(&cctx->prefixDict, 0, sizeof(cctx->prefixDict)); /* single usage */
5431 assert(prefixDict.dict==NULL || cctx->cdict==NULL); /* only one can be set */
5432 if (cctx->cdict && !cctx->localDict.cdict) {
5433 /* Let the cdict's compression level take priority over the requested params.
5434 * But do not take the cdict's compression level if the "cdict" is actually a localDict
5435 * generated from ZSTD_initLocalDict().
5436 */
5437 params.compressionLevel = cctx->cdict->compressionLevel;
5438 }
5439 DEBUGLOG(4, "ZSTD_compressStream2 : transparent init stage");
5440 if (endOp == ZSTD_e_end) cctx->pledgedSrcSizePlusOne = inSize + 1; /* auto-fix pledgedSrcSize */
5441 {
5442 size_t const dictSize = prefixDict.dict
5443 ? prefixDict.dictSize
5444 : (cctx->cdict ? cctx->cdict->dictContentSize : 0);
5445 ZSTD_cParamMode_e const mode = ZSTD_getCParamMode(cctx->cdict, ¶ms, cctx->pledgedSrcSizePlusOne - 1);
5446 params.cParams = ZSTD_getCParamsFromCCtxParams(
5447 ¶ms, cctx->pledgedSrcSizePlusOne-1,
5448 dictSize, mode);
5449 }
5450
5451 params.useBlockSplitter = ZSTD_resolveBlockSplitterMode(params.useBlockSplitter, ¶ms.cParams);
5452 params.ldmParams.enableLdm = ZSTD_resolveEnableLdm(params.ldmParams.enableLdm, ¶ms.cParams);
5453 params.useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(params.useRowMatchFinder, ¶ms.cParams);
5454
5455 { U64 const pledgedSrcSize = cctx->pledgedSrcSizePlusOne - 1;
5456 assert(!ZSTD_isError(ZSTD_checkCParams(params.cParams)));
5457 FORWARD_IF_ERROR( ZSTD_compressBegin_internal(cctx,
5458 prefixDict.dict, prefixDict.dictSize, prefixDict.dictContentType, ZSTD_dtlm_fast,
5459 cctx->cdict,
5460 ¶ms, pledgedSrcSize,
5461 ZSTDb_buffered) , "");
5462 assert(cctx->appliedParams.nbWorkers == 0);
5463 cctx->inToCompress = 0;
5464 cctx->inBuffPos = 0;
5465 if (cctx->appliedParams.inBufferMode == ZSTD_bm_buffered) {
5466 /* for small input: avoid automatic flush on reaching end of block, since
5467 * it would require to add a 3-bytes null block to end frame
5468 */
5469 cctx->inBuffTarget = cctx->blockSize + (cctx->blockSize == pledgedSrcSize);
5470 } else {
5471 cctx->inBuffTarget = 0;
5472 }
5473 cctx->outBuffContentSize = cctx->outBuffFlushedSize = 0;
5474 cctx->streamStage = zcss_load;
5475 cctx->frameEnded = 0;
5476 }
5477 return 0;
5478 }
5479
5480 size_t ZSTD_compressStream2( ZSTD_CCtx* cctx,
5481 ZSTD_outBuffer* output,
5482 ZSTD_inBuffer* input,
5483 ZSTD_EndDirective endOp)
5484 {
5485 DEBUGLOG(5, "ZSTD_compressStream2, endOp=%u ", (unsigned)endOp);
5486 /* check conditions */
5487 RETURN_ERROR_IF(output->pos > output->size, dstSize_tooSmall, "invalid output buffer");
5488 RETURN_ERROR_IF(input->pos > input->size, srcSize_wrong, "invalid input buffer");
5489 RETURN_ERROR_IF((U32)endOp > (U32)ZSTD_e_end, parameter_outOfBound, "invalid endDirective");
5490 assert(cctx != NULL);
5491
5492 /* transparent initialization stage */
5493 if (cctx->streamStage == zcss_init) {
5494 FORWARD_IF_ERROR(ZSTD_CCtx_init_compressStream2(cctx, endOp, input->size), "CompressStream2 initialization failed");
5495 ZSTD_setBufferExpectations(cctx, output, input); /* Set initial buffer expectations now that we've initialized */
5496 }
5497 /* end of transparent initialization stage */
5498
5499 FORWARD_IF_ERROR(ZSTD_checkBufferStability(cctx, output, input, endOp), "invalid buffers");
5500 /* compression stage */
5501 FORWARD_IF_ERROR( ZSTD_compressStream_generic(cctx, output, input, endOp) , "");
5502 DEBUGLOG(5, "completed ZSTD_compressStream2");
5503 ZSTD_setBufferExpectations(cctx, output, input);
5504 return cctx->outBuffContentSize - cctx->outBuffFlushedSize; /* remaining to flush */
5505 }
5506
5507 size_t ZSTD_compressStream2_simpleArgs (
5508 ZSTD_CCtx* cctx,
5509 void* dst, size_t dstCapacity, size_t* dstPos,
5510 const void* src, size_t srcSize, size_t* srcPos,
5511 ZSTD_EndDirective endOp)
5512 {
5513 ZSTD_outBuffer output = { dst, dstCapacity, *dstPos };
5514 ZSTD_inBuffer input = { src, srcSize, *srcPos };
5515 /* ZSTD_compressStream2() will check validity of dstPos and srcPos */
5516 size_t const cErr = ZSTD_compressStream2(cctx, &output, &input, endOp);
5517 *dstPos = output.pos;
5518 *srcPos = input.pos;
5519 return cErr;
5520 }
5521
5522 size_t ZSTD_compress2(ZSTD_CCtx* cctx,
5523 void* dst, size_t dstCapacity,
5524 const void* src, size_t srcSize)
5525 {
5526 ZSTD_bufferMode_e const originalInBufferMode = cctx->requestedParams.inBufferMode;
5527 ZSTD_bufferMode_e const originalOutBufferMode = cctx->requestedParams.outBufferMode;
5528 DEBUGLOG(4, "ZSTD_compress2 (srcSize=%u)", (unsigned)srcSize);
5529 ZSTD_CCtx_reset(cctx, ZSTD_reset_session_only);
5530 /* Enable stable input/output buffers. */
5531 cctx->requestedParams.inBufferMode = ZSTD_bm_stable;
5532 cctx->requestedParams.outBufferMode = ZSTD_bm_stable;
5533 { size_t oPos = 0;
5534 size_t iPos = 0;
5535 size_t const result = ZSTD_compressStream2_simpleArgs(cctx,
5536 dst, dstCapacity, &oPos,
5537 src, srcSize, &iPos,
5538 ZSTD_e_end);
5539 /* Reset to the original values. */
5540 cctx->requestedParams.inBufferMode = originalInBufferMode;
5541 cctx->requestedParams.outBufferMode = originalOutBufferMode;
5542 FORWARD_IF_ERROR(result, "ZSTD_compressStream2_simpleArgs failed");
5543 if (result != 0) { /* compression not completed, due to lack of output space */
5544 assert(oPos == dstCapacity);
5545 RETURN_ERROR(dstSize_tooSmall, "");
5546 }
5547 assert(iPos == srcSize); /* all input is expected consumed */
5548 return oPos;
5549 }
5550 }
5551
5552 typedef struct {
5553 U32 idx; /* Index in array of ZSTD_Sequence */
5554 U32 posInSequence; /* Position within sequence at idx */
5555 size_t posInSrc; /* Number of bytes given by sequences provided so far */
5556 } ZSTD_sequencePosition;
5557
5558 /* ZSTD_validateSequence() :
5559 * @offCode : is presumed to follow format required by ZSTD_storeSeq()
5560 * @returns a ZSTD error code if sequence is not valid
5561 */
5562 static size_t
5563 ZSTD_validateSequence(U32 offCode, U32 matchLength,
5564 size_t posInSrc, U32 windowLog, size_t dictSize)
5565 {
5566 U32 const windowSize = 1 << windowLog;
5567 /* posInSrc represents the amount of data the decoder would decode up to this point.
5568 * As long as the amount of data decoded is less than or equal to window size, offsets may be
5569 * larger than the total length of output decoded in order to reference the dict, even larger than
5570 * window size. After output surpasses windowSize, we're limited to windowSize offsets again.
5571 */
5572 size_t const offsetBound = posInSrc > windowSize ? (size_t)windowSize : posInSrc + (size_t)dictSize;
5573 RETURN_ERROR_IF(offCode > STORE_OFFSET(offsetBound), corruption_detected, "Offset too large!");
5574 RETURN_ERROR_IF(matchLength < MINMATCH, corruption_detected, "Matchlength too small");
5575 return 0;
5576 }
5577
5578 /* Returns an offset code, given a sequence's raw offset, the ongoing repcode array, and whether litLength == 0 */
5579 static U32 ZSTD_finalizeOffCode(U32 rawOffset, const U32 rep[ZSTD_REP_NUM], U32 ll0)
5580 {
5581 U32 offCode = STORE_OFFSET(rawOffset);
5582
5583 if (!ll0 && rawOffset == rep[0]) {
5584 offCode = STORE_REPCODE_1;
5585 } else if (rawOffset == rep[1]) {
5586 offCode = STORE_REPCODE(2 - ll0);
5587 } else if (rawOffset == rep[2]) {
5588 offCode = STORE_REPCODE(3 - ll0);
5589 } else if (ll0 && rawOffset == rep[0] - 1) {
5590 offCode = STORE_REPCODE_3;
5591 }
5592 return offCode;
5593 }
5594
5595 /* Returns 0 on success, and a ZSTD_error otherwise. This function scans through an array of
5596 * ZSTD_Sequence, storing the sequences it finds, until it reaches a block delimiter.
5597 */
5598 static size_t
5599 ZSTD_copySequencesToSeqStoreExplicitBlockDelim(ZSTD_CCtx* cctx,
5600 ZSTD_sequencePosition* seqPos,
5601 const ZSTD_Sequence* const inSeqs, size_t inSeqsSize,
5602 const void* src, size_t blockSize)
5603 {
5604 U32 idx = seqPos->idx;
5605 BYTE const* ip = (BYTE const*)(src);
5606 const BYTE* const iend = ip + blockSize;
5607 repcodes_t updatedRepcodes;
5608 U32 dictSize;
5609
5610 if (cctx->cdict) {
5611 dictSize = (U32)cctx->cdict->dictContentSize;
5612 } else if (cctx->prefixDict.dict) {
5613 dictSize = (U32)cctx->prefixDict.dictSize;
5614 } else {
5615 dictSize = 0;
5616 }
5617 ZSTD_memcpy(updatedRepcodes.rep, cctx->blockState.prevCBlock->rep, sizeof(repcodes_t));
5618 for (; (inSeqs[idx].matchLength != 0 || inSeqs[idx].offset != 0) && idx < inSeqsSize; ++idx) {
5619 U32 const litLength = inSeqs[idx].litLength;
5620 U32 const ll0 = (litLength == 0);
5621 U32 const matchLength = inSeqs[idx].matchLength;
5622 U32 const offCode = ZSTD_finalizeOffCode(inSeqs[idx].offset, updatedRepcodes.rep, ll0);
5623 ZSTD_updateRep(updatedRepcodes.rep, offCode, ll0);
5624
5625 DEBUGLOG(6, "Storing sequence: (of: %u, ml: %u, ll: %u)", offCode, matchLength, litLength);
5626 if (cctx->appliedParams.validateSequences) {
5627 seqPos->posInSrc += litLength + matchLength;
5628 FORWARD_IF_ERROR(ZSTD_validateSequence(offCode, matchLength, seqPos->posInSrc,
5629 cctx->appliedParams.cParams.windowLog, dictSize),
5630 "Sequence validation failed");
5631 }
5632 RETURN_ERROR_IF(idx - seqPos->idx > cctx->seqStore.maxNbSeq, memory_allocation,
5633 "Not enough memory allocated. Try adjusting ZSTD_c_minMatch.");
5634 ZSTD_storeSeq(&cctx->seqStore, litLength, ip, iend, offCode, matchLength);
5635 ip += matchLength + litLength;
5636 }
5637 ZSTD_memcpy(cctx->blockState.nextCBlock->rep, updatedRepcodes.rep, sizeof(repcodes_t));
5638
5639 if (inSeqs[idx].litLength) {
5640 DEBUGLOG(6, "Storing last literals of size: %u", inSeqs[idx].litLength);
5641 ZSTD_storeLastLiterals(&cctx->seqStore, ip, inSeqs[idx].litLength);
5642 ip += inSeqs[idx].litLength;
5643 seqPos->posInSrc += inSeqs[idx].litLength;
5644 }
5645 RETURN_ERROR_IF(ip != iend, corruption_detected, "Blocksize doesn't agree with block delimiter!");
5646 seqPos->idx = idx+1;
5647 return 0;
5648 }
5649
5650 /* Returns the number of bytes to move the current read position back by. Only non-zero
5651 * if we ended up splitting a sequence. Otherwise, it may return a ZSTD error if something
5652 * went wrong.
5653 *
5654 * This function will attempt to scan through blockSize bytes represented by the sequences
5655 * in inSeqs, storing any (partial) sequences.
5656 *
5657 * Occasionally, we may want to change the actual number of bytes we consumed from inSeqs to
5658 * avoid splitting a match, or to avoid splitting a match such that it would produce a match
5659 * smaller than MINMATCH. In this case, we return the number of bytes that we didn't read from this block.
5660 */
5661 static size_t
5662 ZSTD_copySequencesToSeqStoreNoBlockDelim(ZSTD_CCtx* cctx, ZSTD_sequencePosition* seqPos,
5663 const ZSTD_Sequence* const inSeqs, size_t inSeqsSize,
5664 const void* src, size_t blockSize)
5665 {
5666 U32 idx = seqPos->idx;
5667 U32 startPosInSequence = seqPos->posInSequence;
5668 U32 endPosInSequence = seqPos->posInSequence + (U32)blockSize;
5669 size_t dictSize;
5670 BYTE const* ip = (BYTE const*)(src);
5671 BYTE const* iend = ip + blockSize; /* May be adjusted if we decide to process fewer than blockSize bytes */
5672 repcodes_t updatedRepcodes;
5673 U32 bytesAdjustment = 0;
5674 U32 finalMatchSplit = 0;
5675
5676 if (cctx->cdict) {
5677 dictSize = cctx->cdict->dictContentSize;
5678 } else if (cctx->prefixDict.dict) {
5679 dictSize = cctx->prefixDict.dictSize;
5680 } else {
5681 dictSize = 0;
5682 }
5683 DEBUGLOG(5, "ZSTD_copySequencesToSeqStore: idx: %u PIS: %u blockSize: %zu", idx, startPosInSequence, blockSize);
5684 DEBUGLOG(5, "Start seq: idx: %u (of: %u ml: %u ll: %u)", idx, inSeqs[idx].offset, inSeqs[idx].matchLength, inSeqs[idx].litLength);
5685 ZSTD_memcpy(updatedRepcodes.rep, cctx->blockState.prevCBlock->rep, sizeof(repcodes_t));
5686 while (endPosInSequence && idx < inSeqsSize && !finalMatchSplit) {
5687 const ZSTD_Sequence currSeq = inSeqs[idx];
5688 U32 litLength = currSeq.litLength;
5689 U32 matchLength = currSeq.matchLength;
5690 U32 const rawOffset = currSeq.offset;
5691 U32 offCode;
5692
5693 /* Modify the sequence depending on where endPosInSequence lies */
5694 if (endPosInSequence >= currSeq.litLength + currSeq.matchLength) {
5695 if (startPosInSequence >= litLength) {
5696 startPosInSequence -= litLength;
5697 litLength = 0;
5698 matchLength -= startPosInSequence;
5699 } else {
5700 litLength -= startPosInSequence;
5701 }
5702 /* Move to the next sequence */
5703 endPosInSequence -= currSeq.litLength + currSeq.matchLength;
5704 startPosInSequence = 0;
5705 idx++;
5706 } else {
5707 /* This is the final (partial) sequence we're adding from inSeqs, and endPosInSequence
5708 does not reach the end of the match. So, we have to split the sequence */
5709 DEBUGLOG(6, "Require a split: diff: %u, idx: %u PIS: %u",
5710 currSeq.litLength + currSeq.matchLength - endPosInSequence, idx, endPosInSequence);
5711 if (endPosInSequence > litLength) {
5712 U32 firstHalfMatchLength;
5713 litLength = startPosInSequence >= litLength ? 0 : litLength - startPosInSequence;
5714 firstHalfMatchLength = endPosInSequence - startPosInSequence - litLength;
5715 if (matchLength > blockSize && firstHalfMatchLength >= cctx->appliedParams.cParams.minMatch) {
5716 /* Only ever split the match if it is larger than the block size */
5717 U32 secondHalfMatchLength = currSeq.matchLength + currSeq.litLength - endPosInSequence;
5718 if (secondHalfMatchLength < cctx->appliedParams.cParams.minMatch) {
5719 /* Move the endPosInSequence backward so that it creates match of minMatch length */
5720 endPosInSequence -= cctx->appliedParams.cParams.minMatch - secondHalfMatchLength;
5721 bytesAdjustment = cctx->appliedParams.cParams.minMatch - secondHalfMatchLength;
5722 firstHalfMatchLength -= bytesAdjustment;
5723 }
5724 matchLength = firstHalfMatchLength;
5725 /* Flag that we split the last match - after storing the sequence, exit the loop,
5726 but keep the value of endPosInSequence */
5727 finalMatchSplit = 1;
5728 } else {
5729 /* Move the position in sequence backwards so that we don't split match, and break to store
5730 * the last literals. We use the original currSeq.litLength as a marker for where endPosInSequence
5731 * should go. We prefer to do this whenever it is not necessary to split the match, or if doing so
5732 * would cause the first half of the match to be too small
5733 */
5734 bytesAdjustment = endPosInSequence - currSeq.litLength;
5735 endPosInSequence = currSeq.litLength;
5736 break;
5737 }
5738 } else {
5739 /* This sequence ends inside the literals, break to store the last literals */
5740 break;
5741 }
5742 }
5743 /* Check if this offset can be represented with a repcode */
5744 { U32 const ll0 = (litLength == 0);
5745 offCode = ZSTD_finalizeOffCode(rawOffset, updatedRepcodes.rep, ll0);
5746 ZSTD_updateRep(updatedRepcodes.rep, offCode, ll0);
5747 }
5748
5749 if (cctx->appliedParams.validateSequences) {
5750 seqPos->posInSrc += litLength + matchLength;
5751 FORWARD_IF_ERROR(ZSTD_validateSequence(offCode, matchLength, seqPos->posInSrc,
5752 cctx->appliedParams.cParams.windowLog, dictSize),
5753 "Sequence validation failed");
5754 }
5755 DEBUGLOG(6, "Storing sequence: (of: %u, ml: %u, ll: %u)", offCode, matchLength, litLength);
5756 RETURN_ERROR_IF(idx - seqPos->idx > cctx->seqStore.maxNbSeq, memory_allocation,
5757 "Not enough memory allocated. Try adjusting ZSTD_c_minMatch.");
5758 ZSTD_storeSeq(&cctx->seqStore, litLength, ip, iend, offCode, matchLength);
5759 ip += matchLength + litLength;
5760 }
5761 DEBUGLOG(5, "Ending seq: idx: %u (of: %u ml: %u ll: %u)", idx, inSeqs[idx].offset, inSeqs[idx].matchLength, inSeqs[idx].litLength);
5762 assert(idx == inSeqsSize || endPosInSequence <= inSeqs[idx].litLength + inSeqs[idx].matchLength);
5763 seqPos->idx = idx;
5764 seqPos->posInSequence = endPosInSequence;
5765 ZSTD_memcpy(cctx->blockState.nextCBlock->rep, updatedRepcodes.rep, sizeof(repcodes_t));
5766
5767 iend -= bytesAdjustment;
5768 if (ip != iend) {
5769 /* Store any last literals */
5770 U32 lastLLSize = (U32)(iend - ip);
5771 assert(ip <= iend);
5772 DEBUGLOG(6, "Storing last literals of size: %u", lastLLSize);
5773 ZSTD_storeLastLiterals(&cctx->seqStore, ip, lastLLSize);
5774 seqPos->posInSrc += lastLLSize;
5775 }
5776
5777 return bytesAdjustment;
5778 }
5779
5780 typedef size_t (*ZSTD_sequenceCopier) (ZSTD_CCtx* cctx, ZSTD_sequencePosition* seqPos,
5781 const ZSTD_Sequence* const inSeqs, size_t inSeqsSize,
5782 const void* src, size_t blockSize);
5783 static ZSTD_sequenceCopier ZSTD_selectSequenceCopier(ZSTD_sequenceFormat_e mode)
5784 {
5785 ZSTD_sequenceCopier sequenceCopier = NULL;
5786 assert(ZSTD_cParam_withinBounds(ZSTD_c_blockDelimiters, mode));
5787 if (mode == ZSTD_sf_explicitBlockDelimiters) {
5788 return ZSTD_copySequencesToSeqStoreExplicitBlockDelim;
5789 } else if (mode == ZSTD_sf_noBlockDelimiters) {
5790 return ZSTD_copySequencesToSeqStoreNoBlockDelim;
5791 }
5792 assert(sequenceCopier != NULL);
5793 return sequenceCopier;
5794 }
5795
5796 /* Compress, block-by-block, all of the sequences given.
5797 *
5798 * Returns the cumulative size of all compressed blocks (including their headers),
5799 * otherwise a ZSTD error.
5800 */
5801 static size_t
5802 ZSTD_compressSequences_internal(ZSTD_CCtx* cctx,
5803 void* dst, size_t dstCapacity,
5804 const ZSTD_Sequence* inSeqs, size_t inSeqsSize,
5805 const void* src, size_t srcSize)
5806 {
5807 size_t cSize = 0;
5808 U32 lastBlock;
5809 size_t blockSize;
5810 size_t compressedSeqsSize;
5811 size_t remaining = srcSize;
5812 ZSTD_sequencePosition seqPos = {0, 0, 0};
5813
5814 BYTE const* ip = (BYTE const*)src;
5815 BYTE* op = (BYTE*)dst;
5816 ZSTD_sequenceCopier const sequenceCopier = ZSTD_selectSequenceCopier(cctx->appliedParams.blockDelimiters);
5817
5818 DEBUGLOG(4, "ZSTD_compressSequences_internal srcSize: %zu, inSeqsSize: %zu", srcSize, inSeqsSize);
5819 /* Special case: empty frame */
5820 if (remaining == 0) {
5821 U32 const cBlockHeader24 = 1 /* last block */ + (((U32)bt_raw)<<1);
5822 RETURN_ERROR_IF(dstCapacity<4, dstSize_tooSmall, "No room for empty frame block header");
5823 MEM_writeLE32(op, cBlockHeader24);
5824 op += ZSTD_blockHeaderSize;
5825 dstCapacity -= ZSTD_blockHeaderSize;
5826 cSize += ZSTD_blockHeaderSize;
5827 }
5828
5829 while (remaining) {
5830 size_t cBlockSize;
5831 size_t additionalByteAdjustment;
5832 lastBlock = remaining <= cctx->blockSize;
5833 blockSize = lastBlock ? (U32)remaining : (U32)cctx->blockSize;
5834 ZSTD_resetSeqStore(&cctx->seqStore);
5835 DEBUGLOG(4, "Working on new block. Blocksize: %zu", blockSize);
5836
5837 additionalByteAdjustment = sequenceCopier(cctx, &seqPos, inSeqs, inSeqsSize, ip, blockSize);
5838 FORWARD_IF_ERROR(additionalByteAdjustment, "Bad sequence copy");
5839 blockSize -= additionalByteAdjustment;
5840
5841 /* If blocks are too small, emit as a nocompress block */
5842 if (blockSize < MIN_CBLOCK_SIZE+ZSTD_blockHeaderSize+1) {
5843 cBlockSize = ZSTD_noCompressBlock(op, dstCapacity, ip, blockSize, lastBlock);
5844 FORWARD_IF_ERROR(cBlockSize, "Nocompress block failed");
5845 DEBUGLOG(4, "Block too small, writing out nocompress block: cSize: %zu", cBlockSize);
5846 cSize += cBlockSize;
5847 ip += blockSize;
5848 op += cBlockSize;
5849 remaining -= blockSize;
5850 dstCapacity -= cBlockSize;
5851 continue;
5852 }
5853
5854 compressedSeqsSize = ZSTD_entropyCompressSeqStore(&cctx->seqStore,
5855 &cctx->blockState.prevCBlock->entropy, &cctx->blockState.nextCBlock->entropy,
5856 &cctx->appliedParams,
5857 op + ZSTD_blockHeaderSize /* Leave space for block header */, dstCapacity - ZSTD_blockHeaderSize,
5858 blockSize,
5859 cctx->entropyWorkspace, ENTROPY_WORKSPACE_SIZE /* statically allocated in resetCCtx */,
5860 cctx->bmi2);
5861 FORWARD_IF_ERROR(compressedSeqsSize, "Compressing sequences of block failed");
5862 DEBUGLOG(4, "Compressed sequences size: %zu", compressedSeqsSize);
5863
5864 if (!cctx->isFirstBlock &&
5865 ZSTD_maybeRLE(&cctx->seqStore) &&
5866 ZSTD_isRLE((BYTE const*)src, srcSize)) {
5867 /* We don't want to emit our first block as a RLE even if it qualifies because
5868 * doing so will cause the decoder (cli only) to throw a "should consume all input error."
5869 * This is only an issue for zstd <= v1.4.3
5870 */
5871 compressedSeqsSize = 1;
5872 }
5873
5874 if (compressedSeqsSize == 0) {
5875 /* ZSTD_noCompressBlock writes the block header as well */
5876 cBlockSize = ZSTD_noCompressBlock(op, dstCapacity, ip, blockSize, lastBlock);
5877 FORWARD_IF_ERROR(cBlockSize, "Nocompress block failed");
5878 DEBUGLOG(4, "Writing out nocompress block, size: %zu", cBlockSize);
5879 } else if (compressedSeqsSize == 1) {
5880 cBlockSize = ZSTD_rleCompressBlock(op, dstCapacity, *ip, blockSize, lastBlock);
5881 FORWARD_IF_ERROR(cBlockSize, "RLE compress block failed");
5882 DEBUGLOG(4, "Writing out RLE block, size: %zu", cBlockSize);
5883 } else {
5884 U32 cBlockHeader;
5885 /* Error checking and repcodes update */
5886 ZSTD_blockState_confirmRepcodesAndEntropyTables(&cctx->blockState);
5887 if (cctx->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid)
5888 cctx->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check;
5889
5890 /* Write block header into beginning of block*/
5891 cBlockHeader = lastBlock + (((U32)bt_compressed)<<1) + (U32)(compressedSeqsSize << 3);
5892 MEM_writeLE24(op, cBlockHeader);
5893 cBlockSize = ZSTD_blockHeaderSize + compressedSeqsSize;
5894 DEBUGLOG(4, "Writing out compressed block, size: %zu", cBlockSize);
5895 }
5896
5897 cSize += cBlockSize;
5898 DEBUGLOG(4, "cSize running total: %zu", cSize);
5899
5900 if (lastBlock) {
5901 break;
5902 } else {
5903 ip += blockSize;
5904 op += cBlockSize;
5905 remaining -= blockSize;
5906 dstCapacity -= cBlockSize;
5907 cctx->isFirstBlock = 0;
5908 }
5909 }
5910
5911 return cSize;
5912 }
5913
5914 size_t ZSTD_compressSequences(ZSTD_CCtx* const cctx, void* dst, size_t dstCapacity,
5915 const ZSTD_Sequence* inSeqs, size_t inSeqsSize,
5916 const void* src, size_t srcSize)
5917 {
5918 BYTE* op = (BYTE*)dst;
5919 size_t cSize = 0;
5920 size_t compressedBlocksSize = 0;
5921 size_t frameHeaderSize = 0;
5922
5923 /* Transparent initialization stage, same as compressStream2() */
5924 DEBUGLOG(3, "ZSTD_compressSequences()");
5925 assert(cctx != NULL);
5926 FORWARD_IF_ERROR(ZSTD_CCtx_init_compressStream2(cctx, ZSTD_e_end, srcSize), "CCtx initialization failed");
5927 /* Begin writing output, starting with frame header */
5928 frameHeaderSize = ZSTD_writeFrameHeader(op, dstCapacity, &cctx->appliedParams, srcSize, cctx->dictID);
5929 op += frameHeaderSize;
5930 dstCapacity -= frameHeaderSize;
5931 cSize += frameHeaderSize;
5932 if (cctx->appliedParams.fParams.checksumFlag && srcSize) {
5933 xxh64_update(&cctx->xxhState, src, srcSize);
5934 }
5935 /* cSize includes block header size and compressed sequences size */
5936 compressedBlocksSize = ZSTD_compressSequences_internal(cctx,
5937 op, dstCapacity,
5938 inSeqs, inSeqsSize,
5939 src, srcSize);
5940 FORWARD_IF_ERROR(compressedBlocksSize, "Compressing blocks failed!");
5941 cSize += compressedBlocksSize;
5942 dstCapacity -= compressedBlocksSize;
5943
5944 if (cctx->appliedParams.fParams.checksumFlag) {
5945 U32 const checksum = (U32) xxh64_digest(&cctx->xxhState);
5946 RETURN_ERROR_IF(dstCapacity<4, dstSize_tooSmall, "no room for checksum");
5947 DEBUGLOG(4, "Write checksum : %08X", (unsigned)checksum);
5948 MEM_writeLE32((char*)dst + cSize, checksum);
5949 cSize += 4;
5950 }
5951
5952 DEBUGLOG(3, "Final compressed size: %zu", cSize);
5953 return cSize;
5954 }
5955
5956 /*====== Finalize ======*/
5957
5958 /*! ZSTD_flushStream() :
5959 * @return : amount of data remaining to flush */
5960 size_t ZSTD_flushStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output)
5961 {
5962 ZSTD_inBuffer input = { NULL, 0, 0 };
5963 return ZSTD_compressStream2(zcs, output, &input, ZSTD_e_flush);
5964 }
5965
5966
5967 size_t ZSTD_endStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output)
5968 {
5969 ZSTD_inBuffer input = { NULL, 0, 0 };
5970 size_t const remainingToFlush = ZSTD_compressStream2(zcs, output, &input, ZSTD_e_end);
5971 FORWARD_IF_ERROR( remainingToFlush , "ZSTD_compressStream2 failed");
5972 if (zcs->appliedParams.nbWorkers > 0) return remainingToFlush; /* minimal estimation */
5973 /* single thread mode : attempt to calculate remaining to flush more precisely */
5974 { size_t const lastBlockSize = zcs->frameEnded ? 0 : ZSTD_BLOCKHEADERSIZE;
5975 size_t const checksumSize = (size_t)(zcs->frameEnded ? 0 : zcs->appliedParams.fParams.checksumFlag * 4);
5976 size_t const toFlush = remainingToFlush + lastBlockSize + checksumSize;
5977 DEBUGLOG(4, "ZSTD_endStream : remaining to flush : %u", (unsigned)toFlush);
5978 return toFlush;
5979 }
5980 }
5981
5982
5983 /*-===== Pre-defined compression levels =====-*/
5984 #include "clevels.h"
5985
5986 int ZSTD_maxCLevel(void) { return ZSTD_MAX_CLEVEL; }
5987 int ZSTD_minCLevel(void) { return (int)-ZSTD_TARGETLENGTH_MAX; }
5988 int ZSTD_defaultCLevel(void) { return ZSTD_CLEVEL_DEFAULT; }
5989
5990 static ZSTD_compressionParameters ZSTD_dedicatedDictSearch_getCParams(int const compressionLevel, size_t const dictSize)
5991 {
5992 ZSTD_compressionParameters cParams = ZSTD_getCParams_internal(compressionLevel, 0, dictSize, ZSTD_cpm_createCDict);
5993 switch (cParams.strategy) {
5994 case ZSTD_fast:
5995 case ZSTD_dfast:
5996 break;
5997 case ZSTD_greedy:
5998 case ZSTD_lazy:
5999 case ZSTD_lazy2:
6000 cParams.hashLog += ZSTD_LAZY_DDSS_BUCKET_LOG;
6001 break;
6002 case ZSTD_btlazy2:
6003 case ZSTD_btopt:
6004 case ZSTD_btultra:
6005 case ZSTD_btultra2:
6006 break;
6007 }
6008 return cParams;
6009 }
6010
6011 static int ZSTD_dedicatedDictSearch_isSupported(
6012 ZSTD_compressionParameters const* cParams)
6013 {
6014 return (cParams->strategy >= ZSTD_greedy)
6015 && (cParams->strategy <= ZSTD_lazy2)
6016 && (cParams->hashLog > cParams->chainLog)
6017 && (cParams->chainLog <= 24);
6018 }
6019
6020 /*
6021 * Reverses the adjustment applied to cparams when enabling dedicated dict
6022 * search. This is used to recover the params set to be used in the working
6023 * context. (Otherwise, those tables would also grow.)
6024 */
6025 static void ZSTD_dedicatedDictSearch_revertCParams(
6026 ZSTD_compressionParameters* cParams) {
6027 switch (cParams->strategy) {
6028 case ZSTD_fast:
6029 case ZSTD_dfast:
6030 break;
6031 case ZSTD_greedy:
6032 case ZSTD_lazy:
6033 case ZSTD_lazy2:
6034 cParams->hashLog -= ZSTD_LAZY_DDSS_BUCKET_LOG;
6035 if (cParams->hashLog < ZSTD_HASHLOG_MIN) {
6036 cParams->hashLog = ZSTD_HASHLOG_MIN;
6037 }
6038 break;
6039 case ZSTD_btlazy2:
6040 case ZSTD_btopt:
6041 case ZSTD_btultra:
6042 case ZSTD_btultra2:
6043 break;
6044 }
6045 }
6046
6047 static U64 ZSTD_getCParamRowSize(U64 srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode)
6048 {
6049 switch (mode) {
6050 case ZSTD_cpm_unknown:
6051 case ZSTD_cpm_noAttachDict:
6052 case ZSTD_cpm_createCDict:
6053 break;
6054 case ZSTD_cpm_attachDict:
6055 dictSize = 0;
6056 break;
6057 default:
6058 assert(0);
6059 break;
6060 }
6061 { int const unknown = srcSizeHint == ZSTD_CONTENTSIZE_UNKNOWN;
6062 size_t const addedSize = unknown && dictSize > 0 ? 500 : 0;
6063 return unknown && dictSize == 0 ? ZSTD_CONTENTSIZE_UNKNOWN : srcSizeHint+dictSize+addedSize;
6064 }
6065 }
6066
6067 /*! ZSTD_getCParams_internal() :
6068 * @return ZSTD_compressionParameters structure for a selected compression level, srcSize and dictSize.
6069 * Note: srcSizeHint 0 means 0, use ZSTD_CONTENTSIZE_UNKNOWN for unknown.
6070 * Use dictSize == 0 for unknown or unused.
6071 * Note: `mode` controls how we treat the `dictSize`. See docs for `ZSTD_cParamMode_e`. */
6072 static ZSTD_compressionParameters ZSTD_getCParams_internal(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode)
6073 {
6074 U64 const rSize = ZSTD_getCParamRowSize(srcSizeHint, dictSize, mode);
6075 U32 const tableID = (rSize <= 256 KB) + (rSize <= 128 KB) + (rSize <= 16 KB);
6076 int row;
6077 DEBUGLOG(5, "ZSTD_getCParams_internal (cLevel=%i)", compressionLevel);
6078
6079 /* row */
6080 if (compressionLevel == 0) row = ZSTD_CLEVEL_DEFAULT; /* 0 == default */
6081 else if (compressionLevel < 0) row = 0; /* entry 0 is baseline for fast mode */
6082 else if (compressionLevel > ZSTD_MAX_CLEVEL) row = ZSTD_MAX_CLEVEL;
6083 else row = compressionLevel;
6084
6085 { ZSTD_compressionParameters cp = ZSTD_defaultCParameters[tableID][row];
6086 DEBUGLOG(5, "ZSTD_getCParams_internal selected tableID: %u row: %u strat: %u", tableID, row, (U32)cp.strategy);
6087 /* acceleration factor */
6088 if (compressionLevel < 0) {
6089 int const clampedCompressionLevel = MAX(ZSTD_minCLevel(), compressionLevel);
6090 cp.targetLength = (unsigned)(-clampedCompressionLevel);
6091 }
6092 /* refine parameters based on srcSize & dictSize */
6093 return ZSTD_adjustCParams_internal(cp, srcSizeHint, dictSize, mode);
6094 }
6095 }
6096
6097 /*! ZSTD_getCParams() :
6098 * @return ZSTD_compressionParameters structure for a selected compression level, srcSize and dictSize.
6099 * Size values are optional, provide 0 if not known or unused */
6100 ZSTD_compressionParameters ZSTD_getCParams(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize)
6101 {
6102 if (srcSizeHint == 0) srcSizeHint = ZSTD_CONTENTSIZE_UNKNOWN;
6103 return ZSTD_getCParams_internal(compressionLevel, srcSizeHint, dictSize, ZSTD_cpm_unknown);
6104 }
6105
6106 /*! ZSTD_getParams() :
6107 * same idea as ZSTD_getCParams()
6108 * @return a `ZSTD_parameters` structure (instead of `ZSTD_compressionParameters`).
6109 * Fields of `ZSTD_frameParameters` are set to default values */
6110 static ZSTD_parameters ZSTD_getParams_internal(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode) {
6111 ZSTD_parameters params;
6112 ZSTD_compressionParameters const cParams = ZSTD_getCParams_internal(compressionLevel, srcSizeHint, dictSize, mode);
6113 DEBUGLOG(5, "ZSTD_getParams (cLevel=%i)", compressionLevel);
6114 ZSTD_memset(¶ms, 0, sizeof(params));
6115 params.cParams = cParams;
6116 params.fParams.contentSizeFlag = 1;
6117 return params;
6118 }
6119
6120 /*! ZSTD_getParams() :
6121 * same idea as ZSTD_getCParams()
6122 * @return a `ZSTD_parameters` structure (instead of `ZSTD_compressionParameters`).
6123 * Fields of `ZSTD_frameParameters` are set to default values */
6124 ZSTD_parameters ZSTD_getParams(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize) {
6125 if (srcSizeHint == 0) srcSizeHint = ZSTD_CONTENTSIZE_UNKNOWN;
6126 return ZSTD_getParams_internal(compressionLevel, srcSizeHint, dictSize, ZSTD_cpm_unknown);
6127 }
6128
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