ReactOS  0.4.15-dev-2359-g0dedb9b
zstd_compress.c
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1 /*
2  * Copyright (c) 2016-present, 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 <string.h> /* memset */
15 #include "cpu.h"
16 #include "mem.h"
17 #include "hist.h" /* HIST_countFast_wksp */
18 #define FSE_STATIC_LINKING_ONLY /* FSE_encodeSymbol */
19 #include "fse.h"
20 #define HUF_STATIC_LINKING_ONLY
21 #include "huf.h"
22 #include "zstd_compress_internal.h"
23 #include "zstd_fast.h"
24 #include "zstd_double_fast.h"
25 #include "zstd_lazy.h"
26 #include "zstd_opt.h"
27 #include "zstd_ldm.h"
28 
29 
30 /*-*************************************
31 * Helper functions
32 ***************************************/
33 size_t ZSTD_compressBound(size_t srcSize) {
34  return ZSTD_COMPRESSBOUND(srcSize);
35 }
36 
37 
38 /*-*************************************
39 * Context memory management
40 ***************************************/
41 struct ZSTD_CDict_s {
42  void* dictBuffer;
43  const void* dictContent;
44  size_t dictContentSize;
45  void* workspace;
46  size_t workspaceSize;
47  ZSTD_matchState_t matchState;
48  ZSTD_compressedBlockState_t cBlockState;
49  ZSTD_customMem customMem;
50  U32 dictID;
51 }; /* typedef'd to ZSTD_CDict within "zstd.h" */
52 
53 ZSTD_CCtx* ZSTD_createCCtx(void)
54 {
55  return ZSTD_createCCtx_advanced(ZSTD_defaultCMem);
56 }
57 
58 static void ZSTD_initCCtx(ZSTD_CCtx* cctx, ZSTD_customMem memManager)
59 {
60  assert(cctx != NULL);
61  memset(cctx, 0, sizeof(*cctx));
62  cctx->customMem = memManager;
63  cctx->bmi2 = ZSTD_cpuid_bmi2(ZSTD_cpuid());
64  { size_t const err = ZSTD_CCtx_resetParameters(cctx);
65  assert(!ZSTD_isError(err));
66  (void)err;
67  }
68 }
69 
70 ZSTD_CCtx* ZSTD_createCCtx_advanced(ZSTD_customMem customMem)
71 {
72  ZSTD_STATIC_ASSERT(zcss_init==0);
73  ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_UNKNOWN==(0ULL - 1));
74  if (!customMem.customAlloc ^ !customMem.customFree) return NULL;
75  { ZSTD_CCtx* const cctx = (ZSTD_CCtx*)ZSTD_malloc(sizeof(ZSTD_CCtx), customMem);
76  if (!cctx) return NULL;
77  ZSTD_initCCtx(cctx, customMem);
78  return cctx;
79  }
80 }
81 
82 ZSTD_CCtx* ZSTD_initStaticCCtx(void *workspace, size_t workspaceSize)
83 {
84  ZSTD_CCtx* const cctx = (ZSTD_CCtx*) workspace;
85  if (workspaceSize <= sizeof(ZSTD_CCtx)) return NULL; /* minimum size */
86  if ((size_t)workspace & 7) return NULL; /* must be 8-aligned */
87  memset(workspace, 0, workspaceSize); /* may be a bit generous, could memset be smaller ? */
88  cctx->staticSize = workspaceSize;
89  cctx->workSpace = (void*)(cctx+1);
90  cctx->workSpaceSize = workspaceSize - sizeof(ZSTD_CCtx);
91 
92  /* statically sized space. entropyWorkspace never moves (but prev/next block swap places) */
93  if (cctx->workSpaceSize < HUF_WORKSPACE_SIZE + 2 * sizeof(ZSTD_compressedBlockState_t)) return NULL;
94  assert(((size_t)cctx->workSpace & (sizeof(void*)-1)) == 0); /* ensure correct alignment */
95  cctx->blockState.prevCBlock = (ZSTD_compressedBlockState_t*)cctx->workSpace;
96  cctx->blockState.nextCBlock = cctx->blockState.prevCBlock + 1;
97  {
98  void* const ptr = cctx->blockState.nextCBlock + 1;
99  cctx->entropyWorkspace = (U32*)ptr;
100  }
101  cctx->bmi2 = ZSTD_cpuid_bmi2(ZSTD_cpuid());
102  return cctx;
103 }
104 
105 static void ZSTD_freeCCtxContent(ZSTD_CCtx* cctx)
106 {
107  assert(cctx != NULL);
108  assert(cctx->staticSize == 0);
109  ZSTD_free(cctx->workSpace, cctx->customMem); cctx->workSpace = NULL;
110  ZSTD_freeCDict(cctx->cdictLocal); cctx->cdictLocal = NULL;
111 #ifdef ZSTD_MULTITHREAD
112  ZSTDMT_freeCCtx(cctx->mtctx); cctx->mtctx = NULL;
113 #endif
114 }
115 
116 size_t ZSTD_freeCCtx(ZSTD_CCtx* cctx)
117 {
118  if (cctx==NULL) return 0; /* support free on NULL */
119  if (cctx->staticSize) return ERROR(memory_allocation); /* not compatible with static CCtx */
120  ZSTD_freeCCtxContent(cctx);
121  ZSTD_free(cctx, cctx->customMem);
122  return 0;
123 }
124 
125 
126 static size_t ZSTD_sizeof_mtctx(const ZSTD_CCtx* cctx)
127 {
128 #ifdef ZSTD_MULTITHREAD
129  return ZSTDMT_sizeof_CCtx(cctx->mtctx);
130 #else
131  (void) cctx;
132  return 0;
133 #endif
134 }
135 
136 
137 size_t ZSTD_sizeof_CCtx(const ZSTD_CCtx* cctx)
138 {
139  if (cctx==NULL) return 0; /* support sizeof on NULL */
140  return sizeof(*cctx) + cctx->workSpaceSize
141  + ZSTD_sizeof_CDict(cctx->cdictLocal)
142  + ZSTD_sizeof_mtctx(cctx);
143 }
144 
145 size_t ZSTD_sizeof_CStream(const ZSTD_CStream* zcs)
146 {
147  return ZSTD_sizeof_CCtx(zcs); /* same object */
148 }
149 
150 /* private API call, for dictBuilder only */
151 const seqStore_t* ZSTD_getSeqStore(const ZSTD_CCtx* ctx) { return &(ctx->seqStore); }
152 
153 static ZSTD_CCtx_params ZSTD_makeCCtxParamsFromCParams(
154  ZSTD_compressionParameters cParams)
155 {
156  ZSTD_CCtx_params cctxParams;
157  memset(&cctxParams, 0, sizeof(cctxParams));
158  cctxParams.cParams = cParams;
159  cctxParams.compressionLevel = ZSTD_CLEVEL_DEFAULT; /* should not matter, as all cParams are presumed properly defined */
160  assert(!ZSTD_checkCParams(cParams));
161  cctxParams.fParams.contentSizeFlag = 1;
162  return cctxParams;
163 }
164 
165 static ZSTD_CCtx_params* ZSTD_createCCtxParams_advanced(
166  ZSTD_customMem customMem)
167 {
168  ZSTD_CCtx_params* params;
169  if (!customMem.customAlloc ^ !customMem.customFree) return NULL;
170  params = (ZSTD_CCtx_params*)ZSTD_calloc(
171  sizeof(ZSTD_CCtx_params), customMem);
172  if (!params) { return NULL; }
173  params->customMem = customMem;
174  params->compressionLevel = ZSTD_CLEVEL_DEFAULT;
175  params->fParams.contentSizeFlag = 1;
176  return params;
177 }
178 
179 ZSTD_CCtx_params* ZSTD_createCCtxParams(void)
180 {
181  return ZSTD_createCCtxParams_advanced(ZSTD_defaultCMem);
182 }
183 
184 size_t ZSTD_freeCCtxParams(ZSTD_CCtx_params* params)
185 {
186  if (params == NULL) { return 0; }
187  ZSTD_free(params, params->customMem);
188  return 0;
189 }
190 
191 size_t ZSTD_CCtxParams_reset(ZSTD_CCtx_params* params)
192 {
193  return ZSTD_CCtxParams_init(params, ZSTD_CLEVEL_DEFAULT);
194 }
195 
196 size_t ZSTD_CCtxParams_init(ZSTD_CCtx_params* cctxParams, int compressionLevel) {
197  if (!cctxParams) { return ERROR(GENERIC); }
198  memset(cctxParams, 0, sizeof(*cctxParams));
199  cctxParams->compressionLevel = compressionLevel;
200  cctxParams->fParams.contentSizeFlag = 1;
201  return 0;
202 }
203 
204 size_t ZSTD_CCtxParams_init_advanced(ZSTD_CCtx_params* cctxParams, ZSTD_parameters params)
205 {
206  if (!cctxParams) { return ERROR(GENERIC); }
207  CHECK_F( ZSTD_checkCParams(params.cParams) );
208  memset(cctxParams, 0, sizeof(*cctxParams));
209  cctxParams->cParams = params.cParams;
210  cctxParams->fParams = params.fParams;
211  cctxParams->compressionLevel = ZSTD_CLEVEL_DEFAULT; /* should not matter, as all cParams are presumed properly defined */
212  assert(!ZSTD_checkCParams(params.cParams));
213  return 0;
214 }
215 
216 /* ZSTD_assignParamsToCCtxParams() :
217  * params is presumed valid at this stage */
218 static ZSTD_CCtx_params ZSTD_assignParamsToCCtxParams(
219  ZSTD_CCtx_params cctxParams, ZSTD_parameters params)
220 {
221  ZSTD_CCtx_params ret = cctxParams;
222  ret.cParams = params.cParams;
223  ret.fParams = params.fParams;
224  ret.compressionLevel = ZSTD_CLEVEL_DEFAULT; /* should not matter, as all cParams are presumed properly defined */
225  assert(!ZSTD_checkCParams(params.cParams));
226  return ret;
227 }
228 
229 #define CLAMPCHECK(val,min,max) { \
230  if (((val)<(min)) | ((val)>(max))) { \
231  return ERROR(parameter_outOfBound); \
232 } }
233 
234 
235 static int ZSTD_isUpdateAuthorized(ZSTD_cParameter param)
236 {
237  switch(param)
238  {
239  case ZSTD_p_compressionLevel:
240  case ZSTD_p_hashLog:
241  case ZSTD_p_chainLog:
242  case ZSTD_p_searchLog:
243  case ZSTD_p_minMatch:
244  case ZSTD_p_targetLength:
245  case ZSTD_p_compressionStrategy:
246  return 1;
247 
248  case ZSTD_p_format:
249  case ZSTD_p_windowLog:
250  case ZSTD_p_contentSizeFlag:
251  case ZSTD_p_checksumFlag:
252  case ZSTD_p_dictIDFlag:
253  case ZSTD_p_forceMaxWindow :
254  case ZSTD_p_nbWorkers:
255  case ZSTD_p_jobSize:
256  case ZSTD_p_overlapSizeLog:
257  case ZSTD_p_enableLongDistanceMatching:
258  case ZSTD_p_ldmHashLog:
259  case ZSTD_p_ldmMinMatch:
260  case ZSTD_p_ldmBucketSizeLog:
261  case ZSTD_p_ldmHashEveryLog:
262  case ZSTD_p_forceAttachDict:
263  default:
264  return 0;
265  }
266 }
267 
268 size_t ZSTD_CCtx_setParameter(ZSTD_CCtx* cctx, ZSTD_cParameter param, unsigned value)
269 {
270  DEBUGLOG(4, "ZSTD_CCtx_setParameter (%u, %u)", (U32)param, value);
271  if (cctx->streamStage != zcss_init) {
272  if (ZSTD_isUpdateAuthorized(param)) {
273  cctx->cParamsChanged = 1;
274  } else {
275  return ERROR(stage_wrong);
276  } }
277 
278  switch(param)
279  {
280  case ZSTD_p_format :
281  return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
282 
283  case ZSTD_p_compressionLevel:
284  if (cctx->cdict) return ERROR(stage_wrong);
285  return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
286 
287  case ZSTD_p_windowLog:
288  case ZSTD_p_hashLog:
289  case ZSTD_p_chainLog:
290  case ZSTD_p_searchLog:
291  case ZSTD_p_minMatch:
292  case ZSTD_p_targetLength:
293  case ZSTD_p_compressionStrategy:
294  if (cctx->cdict) return ERROR(stage_wrong);
295  return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
296 
297  case ZSTD_p_contentSizeFlag:
298  case ZSTD_p_checksumFlag:
299  case ZSTD_p_dictIDFlag:
300  return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
301 
302  case ZSTD_p_forceMaxWindow : /* Force back-references to remain < windowSize,
303  * even when referencing into Dictionary content.
304  * default : 0 when using a CDict, 1 when using a Prefix */
305  return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
306 
307  case ZSTD_p_forceAttachDict:
308  return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
309 
310  case ZSTD_p_nbWorkers:
311  if ((value>0) && cctx->staticSize) {
312  return ERROR(parameter_unsupported); /* MT not compatible with static alloc */
313  }
314  return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
315 
316  case ZSTD_p_jobSize:
317  case ZSTD_p_overlapSizeLog:
318  return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
319 
320  case ZSTD_p_enableLongDistanceMatching:
321  case ZSTD_p_ldmHashLog:
322  case ZSTD_p_ldmMinMatch:
323  case ZSTD_p_ldmBucketSizeLog:
324  case ZSTD_p_ldmHashEveryLog:
325  if (cctx->cdict) return ERROR(stage_wrong);
326  return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
327 
328  default: return ERROR(parameter_unsupported);
329  }
330 }
331 
332 size_t ZSTD_CCtxParam_setParameter(
333  ZSTD_CCtx_params* CCtxParams, ZSTD_cParameter param, unsigned value)
334 {
335  DEBUGLOG(4, "ZSTD_CCtxParam_setParameter (%u, %u)", (U32)param, value);
336  switch(param)
337  {
338  case ZSTD_p_format :
339  if (value > (unsigned)ZSTD_f_zstd1_magicless)
340  return ERROR(parameter_unsupported);
341  CCtxParams->format = (ZSTD_format_e)value;
342  return (size_t)CCtxParams->format;
343 
344  case ZSTD_p_compressionLevel : {
345  int cLevel = (int)value; /* cast expected to restore negative sign */
346  if (cLevel > ZSTD_maxCLevel()) cLevel = ZSTD_maxCLevel();
347  if (cLevel) { /* 0 : does not change current level */
348  CCtxParams->compressionLevel = cLevel;
349  }
350  if (CCtxParams->compressionLevel >= 0) return CCtxParams->compressionLevel;
351  return 0; /* return type (size_t) cannot represent negative values */
352  }
353 
354  case ZSTD_p_windowLog :
355  if (value>0) /* 0 => use default */
356  CLAMPCHECK(value, ZSTD_WINDOWLOG_MIN, ZSTD_WINDOWLOG_MAX);
357  CCtxParams->cParams.windowLog = value;
358  return CCtxParams->cParams.windowLog;
359 
360  case ZSTD_p_hashLog :
361  if (value>0) /* 0 => use default */
362  CLAMPCHECK(value, ZSTD_HASHLOG_MIN, ZSTD_HASHLOG_MAX);
363  CCtxParams->cParams.hashLog = value;
364  return CCtxParams->cParams.hashLog;
365 
366  case ZSTD_p_chainLog :
367  if (value>0) /* 0 => use default */
368  CLAMPCHECK(value, ZSTD_CHAINLOG_MIN, ZSTD_CHAINLOG_MAX);
369  CCtxParams->cParams.chainLog = value;
370  return CCtxParams->cParams.chainLog;
371 
372  case ZSTD_p_searchLog :
373  if (value>0) /* 0 => use default */
374  CLAMPCHECK(value, ZSTD_SEARCHLOG_MIN, ZSTD_SEARCHLOG_MAX);
375  CCtxParams->cParams.searchLog = value;
376  return value;
377 
378  case ZSTD_p_minMatch :
379  if (value>0) /* 0 => use default */
380  CLAMPCHECK(value, ZSTD_SEARCHLENGTH_MIN, ZSTD_SEARCHLENGTH_MAX);
381  CCtxParams->cParams.searchLength = value;
382  return CCtxParams->cParams.searchLength;
383 
384  case ZSTD_p_targetLength :
385  /* all values are valid. 0 => use default */
386  CCtxParams->cParams.targetLength = value;
387  return CCtxParams->cParams.targetLength;
388 
389  case ZSTD_p_compressionStrategy :
390  if (value>0) /* 0 => use default */
391  CLAMPCHECK(value, (unsigned)ZSTD_fast, (unsigned)ZSTD_btultra);
392  CCtxParams->cParams.strategy = (ZSTD_strategy)value;
393  return (size_t)CCtxParams->cParams.strategy;
394 
395  case ZSTD_p_contentSizeFlag :
396  /* Content size written in frame header _when known_ (default:1) */
397  DEBUGLOG(4, "set content size flag = %u", (value>0));
398  CCtxParams->fParams.contentSizeFlag = value > 0;
399  return CCtxParams->fParams.contentSizeFlag;
400 
401  case ZSTD_p_checksumFlag :
402  /* A 32-bits content checksum will be calculated and written at end of frame (default:0) */
403  CCtxParams->fParams.checksumFlag = value > 0;
404  return CCtxParams->fParams.checksumFlag;
405 
406  case ZSTD_p_dictIDFlag : /* When applicable, dictionary's dictID is provided in frame header (default:1) */
407  DEBUGLOG(4, "set dictIDFlag = %u", (value>0));
408  CCtxParams->fParams.noDictIDFlag = !value;
409  return !CCtxParams->fParams.noDictIDFlag;
410 
411  case ZSTD_p_forceMaxWindow :
412  CCtxParams->forceWindow = (value > 0);
413  return CCtxParams->forceWindow;
414 
415  case ZSTD_p_forceAttachDict :
416  CCtxParams->attachDictPref = value ?
417  (value > 0 ? ZSTD_dictForceAttach : ZSTD_dictForceCopy) :
418  ZSTD_dictDefaultAttach;
419  return CCtxParams->attachDictPref;
420 
421  case ZSTD_p_nbWorkers :
422 #ifndef ZSTD_MULTITHREAD
423  if (value>0) return ERROR(parameter_unsupported);
424  return 0;
425 #else
426  return ZSTDMT_CCtxParam_setNbWorkers(CCtxParams, value);
427 #endif
428 
429  case ZSTD_p_jobSize :
430 #ifndef ZSTD_MULTITHREAD
431  return ERROR(parameter_unsupported);
432 #else
433  return ZSTDMT_CCtxParam_setMTCtxParameter(CCtxParams, ZSTDMT_p_jobSize, value);
434 #endif
435 
436  case ZSTD_p_overlapSizeLog :
437 #ifndef ZSTD_MULTITHREAD
438  return ERROR(parameter_unsupported);
439 #else
440  return ZSTDMT_CCtxParam_setMTCtxParameter(CCtxParams, ZSTDMT_p_overlapSectionLog, value);
441 #endif
442 
443  case ZSTD_p_enableLongDistanceMatching :
444  CCtxParams->ldmParams.enableLdm = (value>0);
445  return CCtxParams->ldmParams.enableLdm;
446 
447  case ZSTD_p_ldmHashLog :
448  if (value>0) /* 0 ==> auto */
449  CLAMPCHECK(value, ZSTD_HASHLOG_MIN, ZSTD_HASHLOG_MAX);
450  CCtxParams->ldmParams.hashLog = value;
451  return CCtxParams->ldmParams.hashLog;
452 
453  case ZSTD_p_ldmMinMatch :
454  if (value>0) /* 0 ==> default */
455  CLAMPCHECK(value, ZSTD_LDM_MINMATCH_MIN, ZSTD_LDM_MINMATCH_MAX);
456  CCtxParams->ldmParams.minMatchLength = value;
457  return CCtxParams->ldmParams.minMatchLength;
458 
459  case ZSTD_p_ldmBucketSizeLog :
460  if (value > ZSTD_LDM_BUCKETSIZELOG_MAX)
461  return ERROR(parameter_outOfBound);
462  CCtxParams->ldmParams.bucketSizeLog = value;
463  return CCtxParams->ldmParams.bucketSizeLog;
464 
465  case ZSTD_p_ldmHashEveryLog :
466  if (value > ZSTD_WINDOWLOG_MAX - ZSTD_HASHLOG_MIN)
467  return ERROR(parameter_outOfBound);
468  CCtxParams->ldmParams.hashEveryLog = value;
469  return CCtxParams->ldmParams.hashEveryLog;
470 
471  default: return ERROR(parameter_unsupported);
472  }
473 }
474 
475 size_t ZSTD_CCtx_getParameter(ZSTD_CCtx* cctx, ZSTD_cParameter param, unsigned* value)
476 {
477  return ZSTD_CCtxParam_getParameter(&cctx->requestedParams, param, value);
478 }
479 
480 size_t ZSTD_CCtxParam_getParameter(
481  ZSTD_CCtx_params* CCtxParams, ZSTD_cParameter param, unsigned* value)
482 {
483  switch(param)
484  {
485  case ZSTD_p_format :
486  *value = CCtxParams->format;
487  break;
488  case ZSTD_p_compressionLevel :
489  *value = CCtxParams->compressionLevel;
490  break;
491  case ZSTD_p_windowLog :
492  *value = CCtxParams->cParams.windowLog;
493  break;
494  case ZSTD_p_hashLog :
495  *value = CCtxParams->cParams.hashLog;
496  break;
497  case ZSTD_p_chainLog :
498  *value = CCtxParams->cParams.chainLog;
499  break;
500  case ZSTD_p_searchLog :
501  *value = CCtxParams->cParams.searchLog;
502  break;
503  case ZSTD_p_minMatch :
504  *value = CCtxParams->cParams.searchLength;
505  break;
506  case ZSTD_p_targetLength :
507  *value = CCtxParams->cParams.targetLength;
508  break;
509  case ZSTD_p_compressionStrategy :
510  *value = (unsigned)CCtxParams->cParams.strategy;
511  break;
512  case ZSTD_p_contentSizeFlag :
513  *value = CCtxParams->fParams.contentSizeFlag;
514  break;
515  case ZSTD_p_checksumFlag :
516  *value = CCtxParams->fParams.checksumFlag;
517  break;
518  case ZSTD_p_dictIDFlag :
519  *value = !CCtxParams->fParams.noDictIDFlag;
520  break;
521  case ZSTD_p_forceMaxWindow :
522  *value = CCtxParams->forceWindow;
523  break;
524  case ZSTD_p_forceAttachDict :
525  *value = CCtxParams->attachDictPref;
526  break;
527  case ZSTD_p_nbWorkers :
528 #ifndef ZSTD_MULTITHREAD
529  assert(CCtxParams->nbWorkers == 0);
530 #endif
531  *value = CCtxParams->nbWorkers;
532  break;
533  case ZSTD_p_jobSize :
534 #ifndef ZSTD_MULTITHREAD
535  return ERROR(parameter_unsupported);
536 #else
537  *value = CCtxParams->jobSize;
538  break;
539 #endif
540  case ZSTD_p_overlapSizeLog :
541 #ifndef ZSTD_MULTITHREAD
542  return ERROR(parameter_unsupported);
543 #else
544  *value = CCtxParams->overlapSizeLog;
545  break;
546 #endif
547  case ZSTD_p_enableLongDistanceMatching :
548  *value = CCtxParams->ldmParams.enableLdm;
549  break;
550  case ZSTD_p_ldmHashLog :
551  *value = CCtxParams->ldmParams.hashLog;
552  break;
553  case ZSTD_p_ldmMinMatch :
554  *value = CCtxParams->ldmParams.minMatchLength;
555  break;
556  case ZSTD_p_ldmBucketSizeLog :
557  *value = CCtxParams->ldmParams.bucketSizeLog;
558  break;
559  case ZSTD_p_ldmHashEveryLog :
560  *value = CCtxParams->ldmParams.hashEveryLog;
561  break;
562  default: return ERROR(parameter_unsupported);
563  }
564  return 0;
565 }
566 
574 size_t ZSTD_CCtx_setParametersUsingCCtxParams(
575  ZSTD_CCtx* cctx, const ZSTD_CCtx_params* params)
576 {
577  DEBUGLOG(4, "ZSTD_CCtx_setParametersUsingCCtxParams");
578  if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
579  if (cctx->cdict) return ERROR(stage_wrong);
580 
581  cctx->requestedParams = *params;
582  return 0;
583 }
584 
585 ZSTDLIB_API size_t ZSTD_CCtx_setPledgedSrcSize(ZSTD_CCtx* cctx, unsigned long long pledgedSrcSize)
586 {
587  DEBUGLOG(4, "ZSTD_CCtx_setPledgedSrcSize to %u bytes", (U32)pledgedSrcSize);
588  if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
589  cctx->pledgedSrcSizePlusOne = pledgedSrcSize+1;
590  return 0;
591 }
592 
593 size_t ZSTD_CCtx_loadDictionary_advanced(
594  ZSTD_CCtx* cctx, const void* dict, size_t dictSize,
595  ZSTD_dictLoadMethod_e dictLoadMethod, ZSTD_dictContentType_e dictContentType)
596 {
597  if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
598  if (cctx->staticSize) return ERROR(memory_allocation); /* no malloc for static CCtx */
599  DEBUGLOG(4, "ZSTD_CCtx_loadDictionary_advanced (size: %u)", (U32)dictSize);
600  ZSTD_freeCDict(cctx->cdictLocal); /* in case one already exists */
601  if (dict==NULL || dictSize==0) { /* no dictionary mode */
602  cctx->cdictLocal = NULL;
603  cctx->cdict = NULL;
604  } else {
605  ZSTD_compressionParameters const cParams =
606  ZSTD_getCParamsFromCCtxParams(&cctx->requestedParams, cctx->pledgedSrcSizePlusOne-1, dictSize);
607  cctx->cdictLocal = ZSTD_createCDict_advanced(
608  dict, dictSize,
609  dictLoadMethod, dictContentType,
610  cParams, cctx->customMem);
611  cctx->cdict = cctx->cdictLocal;
612  if (cctx->cdictLocal == NULL)
613  return ERROR(memory_allocation);
614  }
615  return 0;
616 }
617 
618 ZSTDLIB_API size_t ZSTD_CCtx_loadDictionary_byReference(
619  ZSTD_CCtx* cctx, const void* dict, size_t dictSize)
620 {
621  return ZSTD_CCtx_loadDictionary_advanced(
622  cctx, dict, dictSize, ZSTD_dlm_byRef, ZSTD_dct_auto);
623 }
624 
625 ZSTDLIB_API size_t ZSTD_CCtx_loadDictionary(ZSTD_CCtx* cctx, const void* dict, size_t dictSize)
626 {
627  return ZSTD_CCtx_loadDictionary_advanced(
628  cctx, dict, dictSize, ZSTD_dlm_byCopy, ZSTD_dct_auto);
629 }
630 
631 
632 size_t ZSTD_CCtx_refCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict)
633 {
634  if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
635  cctx->cdict = cdict;
636  memset(&cctx->prefixDict, 0, sizeof(cctx->prefixDict)); /* exclusive */
637  return 0;
638 }
639 
640 size_t ZSTD_CCtx_refPrefix(ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize)
641 {
642  return ZSTD_CCtx_refPrefix_advanced(cctx, prefix, prefixSize, ZSTD_dct_rawContent);
643 }
644 
645 size_t ZSTD_CCtx_refPrefix_advanced(
646  ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize, ZSTD_dictContentType_e dictContentType)
647 {
648  if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
649  cctx->cdict = NULL; /* prefix discards any prior cdict */
650  cctx->prefixDict.dict = prefix;
651  cctx->prefixDict.dictSize = prefixSize;
652  cctx->prefixDict.dictContentType = dictContentType;
653  return 0;
654 }
655 
658 void ZSTD_CCtx_reset(ZSTD_CCtx* cctx)
659 {
660  cctx->streamStage = zcss_init;
661  cctx->pledgedSrcSizePlusOne = 0;
662 }
663 
664 size_t ZSTD_CCtx_resetParameters(ZSTD_CCtx* cctx)
665 {
666  if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
667  cctx->cdict = NULL;
668  return ZSTD_CCtxParams_reset(&cctx->requestedParams);
669 }
670 
674 size_t ZSTD_checkCParams(ZSTD_compressionParameters cParams)
675 {
676  CLAMPCHECK(cParams.windowLog, ZSTD_WINDOWLOG_MIN, ZSTD_WINDOWLOG_MAX);
677  CLAMPCHECK(cParams.chainLog, ZSTD_CHAINLOG_MIN, ZSTD_CHAINLOG_MAX);
678  CLAMPCHECK(cParams.hashLog, ZSTD_HASHLOG_MIN, ZSTD_HASHLOG_MAX);
679  CLAMPCHECK(cParams.searchLog, ZSTD_SEARCHLOG_MIN, ZSTD_SEARCHLOG_MAX);
680  CLAMPCHECK(cParams.searchLength, ZSTD_SEARCHLENGTH_MIN, ZSTD_SEARCHLENGTH_MAX);
681  ZSTD_STATIC_ASSERT(ZSTD_TARGETLENGTH_MIN == 0);
682  if (cParams.targetLength > ZSTD_TARGETLENGTH_MAX)
683  return ERROR(parameter_outOfBound);
684  if ((U32)(cParams.strategy) > (U32)ZSTD_btultra)
685  return ERROR(parameter_unsupported);
686  return 0;
687 }
688 
692 static ZSTD_compressionParameters
693 ZSTD_clampCParams(ZSTD_compressionParameters cParams)
694 {
695 # define CLAMP(val,min,max) { \
696  if (val<min) val=min; \
697  else if (val>max) val=max; \
698  }
699  CLAMP(cParams.windowLog, ZSTD_WINDOWLOG_MIN, ZSTD_WINDOWLOG_MAX);
700  CLAMP(cParams.chainLog, ZSTD_CHAINLOG_MIN, ZSTD_CHAINLOG_MAX);
701  CLAMP(cParams.hashLog, ZSTD_HASHLOG_MIN, ZSTD_HASHLOG_MAX);
702  CLAMP(cParams.searchLog, ZSTD_SEARCHLOG_MIN, ZSTD_SEARCHLOG_MAX);
703  CLAMP(cParams.searchLength, ZSTD_SEARCHLENGTH_MIN, ZSTD_SEARCHLENGTH_MAX);
704  ZSTD_STATIC_ASSERT(ZSTD_TARGETLENGTH_MIN == 0);
705  if (cParams.targetLength > ZSTD_TARGETLENGTH_MAX)
706  cParams.targetLength = ZSTD_TARGETLENGTH_MAX;
707  CLAMP(cParams.strategy, ZSTD_fast, ZSTD_btultra);
708  return cParams;
709 }
710 
713 static U32 ZSTD_cycleLog(U32 hashLog, ZSTD_strategy strat)
714 {
715  U32 const btScale = ((U32)strat >= (U32)ZSTD_btlazy2);
716  return hashLog - btScale;
717 }
718 
724 static ZSTD_compressionParameters
725 ZSTD_adjustCParams_internal(ZSTD_compressionParameters cPar,
726  unsigned long long srcSize,
727  size_t dictSize)
728 {
729  static const U64 minSrcSize = 513; /* (1<<9) + 1 */
730  static const U64 maxWindowResize = 1ULL << (ZSTD_WINDOWLOG_MAX-1);
731  assert(ZSTD_checkCParams(cPar)==0);
732 
733  if (dictSize && (srcSize+1<2) /* srcSize unknown */ )
734  srcSize = minSrcSize; /* presumed small when there is a dictionary */
735  else if (srcSize == 0)
736  srcSize = ZSTD_CONTENTSIZE_UNKNOWN; /* 0 == unknown : presumed large */
737 
738  /* resize windowLog if input is small enough, to use less memory */
739  if ( (srcSize < maxWindowResize)
740  && (dictSize < maxWindowResize) ) {
741  U32 const tSize = (U32)(srcSize + dictSize);
742  static U32 const hashSizeMin = 1 << ZSTD_HASHLOG_MIN;
743  U32 const srcLog = (tSize < hashSizeMin) ? ZSTD_HASHLOG_MIN :
744  ZSTD_highbit32(tSize-1) + 1;
745  if (cPar.windowLog > srcLog) cPar.windowLog = srcLog;
746  }
747  if (cPar.hashLog > cPar.windowLog+1) cPar.hashLog = cPar.windowLog+1;
748  { U32 const cycleLog = ZSTD_cycleLog(cPar.chainLog, cPar.strategy);
749  if (cycleLog > cPar.windowLog)
750  cPar.chainLog -= (cycleLog - cPar.windowLog);
751  }
752 
753  if (cPar.windowLog < ZSTD_WINDOWLOG_ABSOLUTEMIN)
754  cPar.windowLog = ZSTD_WINDOWLOG_ABSOLUTEMIN; /* required for frame header */
755 
756  return cPar;
757 }
758 
759 ZSTD_compressionParameters
760 ZSTD_adjustCParams(ZSTD_compressionParameters cPar,
761  unsigned long long srcSize,
762  size_t dictSize)
763 {
764  cPar = ZSTD_clampCParams(cPar);
765  return ZSTD_adjustCParams_internal(cPar, srcSize, dictSize);
766 }
767 
768 ZSTD_compressionParameters ZSTD_getCParamsFromCCtxParams(
769  const ZSTD_CCtx_params* CCtxParams, U64 srcSizeHint, size_t dictSize)
770 {
771  ZSTD_compressionParameters cParams = ZSTD_getCParams(CCtxParams->compressionLevel, srcSizeHint, dictSize);
772  if (CCtxParams->ldmParams.enableLdm) cParams.windowLog = ZSTD_LDM_DEFAULT_WINDOW_LOG;
773  if (CCtxParams->cParams.windowLog) cParams.windowLog = CCtxParams->cParams.windowLog;
774  if (CCtxParams->cParams.hashLog) cParams.hashLog = CCtxParams->cParams.hashLog;
775  if (CCtxParams->cParams.chainLog) cParams.chainLog = CCtxParams->cParams.chainLog;
776  if (CCtxParams->cParams.searchLog) cParams.searchLog = CCtxParams->cParams.searchLog;
777  if (CCtxParams->cParams.searchLength) cParams.searchLength = CCtxParams->cParams.searchLength;
778  if (CCtxParams->cParams.targetLength) cParams.targetLength = CCtxParams->cParams.targetLength;
779  if (CCtxParams->cParams.strategy) cParams.strategy = CCtxParams->cParams.strategy;
780  assert(!ZSTD_checkCParams(cParams));
781  return ZSTD_adjustCParams_internal(cParams, srcSizeHint, dictSize);
782 }
783 
784 static size_t
785 ZSTD_sizeof_matchState(const ZSTD_compressionParameters* const cParams,
786  const U32 forCCtx)
787 {
788  size_t const chainSize = (cParams->strategy == ZSTD_fast) ? 0 : ((size_t)1 << cParams->chainLog);
789  size_t const hSize = ((size_t)1) << cParams->hashLog;
790  U32 const hashLog3 = (forCCtx && cParams->searchLength==3) ? MIN(ZSTD_HASHLOG3_MAX, cParams->windowLog) : 0;
791  size_t const h3Size = ((size_t)1) << hashLog3;
792  size_t const tableSpace = (chainSize + hSize + h3Size) * sizeof(U32);
793  size_t const optPotentialSpace = ((MaxML+1) + (MaxLL+1) + (MaxOff+1) + (1<<Litbits)) * sizeof(U32)
794  + (ZSTD_OPT_NUM+1) * (sizeof(ZSTD_match_t)+sizeof(ZSTD_optimal_t));
795  size_t const optSpace = (forCCtx && ((cParams->strategy == ZSTD_btopt) ||
796  (cParams->strategy == ZSTD_btultra)))
797  ? optPotentialSpace
798  : 0;
799  DEBUGLOG(4, "chainSize: %u - hSize: %u - h3Size: %u",
800  (U32)chainSize, (U32)hSize, (U32)h3Size);
801  return tableSpace + optSpace;
802 }
803 
804 size_t ZSTD_estimateCCtxSize_usingCCtxParams(const ZSTD_CCtx_params* params)
805 {
806  /* Estimate CCtx size is supported for single-threaded compression only. */
807  if (params->nbWorkers > 0) { return ERROR(GENERIC); }
808  { ZSTD_compressionParameters const cParams =
809  ZSTD_getCParamsFromCCtxParams(params, 0, 0);
810  size_t const blockSize = MIN(ZSTD_BLOCKSIZE_MAX, (size_t)1 << cParams.windowLog);
811  U32 const divider = (cParams.searchLength==3) ? 3 : 4;
812  size_t const maxNbSeq = blockSize / divider;
813  size_t const tokenSpace = WILDCOPY_OVERLENGTH + blockSize + 11*maxNbSeq;
814  size_t const entropySpace = HUF_WORKSPACE_SIZE;
815  size_t const blockStateSpace = 2 * sizeof(ZSTD_compressedBlockState_t);
816  size_t const matchStateSize = ZSTD_sizeof_matchState(&cParams, /* forCCtx */ 1);
817 
818  size_t const ldmSpace = ZSTD_ldm_getTableSize(params->ldmParams);
819  size_t const ldmSeqSpace = ZSTD_ldm_getMaxNbSeq(params->ldmParams, blockSize) * sizeof(rawSeq);
820 
821  size_t const neededSpace = entropySpace + blockStateSpace + tokenSpace +
822  matchStateSize + ldmSpace + ldmSeqSpace;
823 
824  DEBUGLOG(5, "sizeof(ZSTD_CCtx) : %u", (U32)sizeof(ZSTD_CCtx));
825  DEBUGLOG(5, "estimate workSpace : %u", (U32)neededSpace);
826  return sizeof(ZSTD_CCtx) + neededSpace;
827  }
828 }
829 
830 size_t ZSTD_estimateCCtxSize_usingCParams(ZSTD_compressionParameters cParams)
831 {
832  ZSTD_CCtx_params const params = ZSTD_makeCCtxParamsFromCParams(cParams);
833  return ZSTD_estimateCCtxSize_usingCCtxParams(&params);
834 }
835 
836 static size_t ZSTD_estimateCCtxSize_internal(int compressionLevel)
837 {
838  ZSTD_compressionParameters const cParams = ZSTD_getCParams(compressionLevel, 0, 0);
839  return ZSTD_estimateCCtxSize_usingCParams(cParams);
840 }
841 
842 size_t ZSTD_estimateCCtxSize(int compressionLevel)
843 {
844  int level;
845  size_t memBudget = 0;
846  for (level=1; level<=compressionLevel; level++) {
847  size_t const newMB = ZSTD_estimateCCtxSize_internal(level);
848  if (newMB > memBudget) memBudget = newMB;
849  }
850  return memBudget;
851 }
852 
853 size_t ZSTD_estimateCStreamSize_usingCCtxParams(const ZSTD_CCtx_params* params)
854 {
855  if (params->nbWorkers > 0) { return ERROR(GENERIC); }
856  { size_t const CCtxSize = ZSTD_estimateCCtxSize_usingCCtxParams(params);
857  size_t const blockSize = MIN(ZSTD_BLOCKSIZE_MAX, (size_t)1 << params->cParams.windowLog);
858  size_t const inBuffSize = ((size_t)1 << params->cParams.windowLog) + blockSize;
859  size_t const outBuffSize = ZSTD_compressBound(blockSize) + 1;
860  size_t const streamingSize = inBuffSize + outBuffSize;
861 
862  return CCtxSize + streamingSize;
863  }
864 }
865 
866 size_t ZSTD_estimateCStreamSize_usingCParams(ZSTD_compressionParameters cParams)
867 {
868  ZSTD_CCtx_params const params = ZSTD_makeCCtxParamsFromCParams(cParams);
869  return ZSTD_estimateCStreamSize_usingCCtxParams(&params);
870 }
871 
872 static size_t ZSTD_estimateCStreamSize_internal(int compressionLevel)
873 {
874  ZSTD_compressionParameters const cParams = ZSTD_getCParams(compressionLevel, 0, 0);
875  return ZSTD_estimateCStreamSize_usingCParams(cParams);
876 }
877 
878 size_t ZSTD_estimateCStreamSize(int compressionLevel)
879 {
880  int level;
881  size_t memBudget = 0;
882  for (level=1; level<=compressionLevel; level++) {
883  size_t const newMB = ZSTD_estimateCStreamSize_internal(level);
884  if (newMB > memBudget) memBudget = newMB;
885  }
886  return memBudget;
887 }
888 
889 /* ZSTD_getFrameProgression():
890  * tells how much data has been consumed (input) and produced (output) for current frame.
891  * able to count progression inside worker threads (non-blocking mode).
892  */
893 ZSTD_frameProgression ZSTD_getFrameProgression(const ZSTD_CCtx* cctx)
894 {
895 #ifdef ZSTD_MULTITHREAD
896  if (cctx->appliedParams.nbWorkers > 0) {
897  return ZSTDMT_getFrameProgression(cctx->mtctx);
898  }
899 #endif
900  { ZSTD_frameProgression fp;
901  size_t const buffered = (cctx->inBuff == NULL) ? 0 :
902  cctx->inBuffPos - cctx->inToCompress;
903  if (buffered) assert(cctx->inBuffPos >= cctx->inToCompress);
904  assert(buffered <= ZSTD_BLOCKSIZE_MAX);
905  fp.ingested = cctx->consumedSrcSize + buffered;
906  fp.consumed = cctx->consumedSrcSize;
907  fp.produced = cctx->producedCSize;
908  fp.flushed = cctx->producedCSize; /* simplified; some data might still be left within streaming output buffer */
909  fp.currentJobID = 0;
910  fp.nbActiveWorkers = 0;
911  return fp;
912 } }
913 
917 size_t ZSTD_toFlushNow(ZSTD_CCtx* cctx)
918 {
919 #ifdef ZSTD_MULTITHREAD
920  if (cctx->appliedParams.nbWorkers > 0) {
921  return ZSTDMT_toFlushNow(cctx->mtctx);
922  }
923 #endif
924  (void)cctx;
925  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 */
926 }
927 
928 
929 
930 static U32 ZSTD_equivalentCParams(ZSTD_compressionParameters cParams1,
931  ZSTD_compressionParameters cParams2)
932 {
933  return (cParams1.hashLog == cParams2.hashLog)
934  & (cParams1.chainLog == cParams2.chainLog)
935  & (cParams1.strategy == cParams2.strategy) /* opt parser space */
936  & ((cParams1.searchLength==3) == (cParams2.searchLength==3)); /* hashlog3 space */
937 }
938 
939 static void ZSTD_assertEqualCParams(ZSTD_compressionParameters cParams1,
940  ZSTD_compressionParameters cParams2)
941 {
942  (void)cParams1;
943  (void)cParams2;
944  assert(cParams1.windowLog == cParams2.windowLog);
945  assert(cParams1.chainLog == cParams2.chainLog);
946  assert(cParams1.hashLog == cParams2.hashLog);
947  assert(cParams1.searchLog == cParams2.searchLog);
948  assert(cParams1.searchLength == cParams2.searchLength);
949  assert(cParams1.targetLength == cParams2.targetLength);
950  assert(cParams1.strategy == cParams2.strategy);
951 }
952 
955 static U32 ZSTD_equivalentLdmParams(ldmParams_t ldmParams1,
956  ldmParams_t ldmParams2)
957 {
958  return (!ldmParams1.enableLdm && !ldmParams2.enableLdm) ||
959  (ldmParams1.enableLdm == ldmParams2.enableLdm &&
960  ldmParams1.hashLog == ldmParams2.hashLog &&
961  ldmParams1.bucketSizeLog == ldmParams2.bucketSizeLog &&
962  ldmParams1.minMatchLength == ldmParams2.minMatchLength &&
963  ldmParams1.hashEveryLog == ldmParams2.hashEveryLog);
964 }
965 
966 typedef enum { ZSTDb_not_buffered, ZSTDb_buffered } ZSTD_buffered_policy_e;
967 
968 /* ZSTD_sufficientBuff() :
969  * check internal buffers exist for streaming if buffPol == ZSTDb_buffered .
970  * Note : they are assumed to be correctly sized if ZSTD_equivalentCParams()==1 */
971 static U32 ZSTD_sufficientBuff(size_t bufferSize1, size_t maxNbSeq1,
972  size_t maxNbLit1,
973  ZSTD_buffered_policy_e buffPol2,
974  ZSTD_compressionParameters cParams2,
975  U64 pledgedSrcSize)
976 {
977  size_t const windowSize2 = MAX(1, (size_t)MIN(((U64)1 << cParams2.windowLog), pledgedSrcSize));
978  size_t const blockSize2 = MIN(ZSTD_BLOCKSIZE_MAX, windowSize2);
979  size_t const maxNbSeq2 = blockSize2 / ((cParams2.searchLength == 3) ? 3 : 4);
980  size_t const maxNbLit2 = blockSize2;
981  size_t const neededBufferSize2 = (buffPol2==ZSTDb_buffered) ? windowSize2 + blockSize2 : 0;
982  DEBUGLOG(4, "ZSTD_sufficientBuff: is neededBufferSize2=%u <= bufferSize1=%u",
983  (U32)neededBufferSize2, (U32)bufferSize1);
984  DEBUGLOG(4, "ZSTD_sufficientBuff: is maxNbSeq2=%u <= maxNbSeq1=%u",
985  (U32)maxNbSeq2, (U32)maxNbSeq1);
986  DEBUGLOG(4, "ZSTD_sufficientBuff: is maxNbLit2=%u <= maxNbLit1=%u",
987  (U32)maxNbLit2, (U32)maxNbLit1);
988  return (maxNbLit2 <= maxNbLit1)
989  & (maxNbSeq2 <= maxNbSeq1)
990  & (neededBufferSize2 <= bufferSize1);
991 }
992 
994 static U32 ZSTD_equivalentParams(ZSTD_CCtx_params params1,
995  ZSTD_CCtx_params params2,
996  size_t buffSize1,
997  size_t maxNbSeq1, size_t maxNbLit1,
998  ZSTD_buffered_policy_e buffPol2,
999  U64 pledgedSrcSize)
1000 {
1001  DEBUGLOG(4, "ZSTD_equivalentParams: pledgedSrcSize=%u", (U32)pledgedSrcSize);
1002  if (!ZSTD_equivalentCParams(params1.cParams, params2.cParams)) {
1003  DEBUGLOG(4, "ZSTD_equivalentCParams() == 0");
1004  return 0;
1005  }
1006  if (!ZSTD_equivalentLdmParams(params1.ldmParams, params2.ldmParams)) {
1007  DEBUGLOG(4, "ZSTD_equivalentLdmParams() == 0");
1008  return 0;
1009  }
1010  if (!ZSTD_sufficientBuff(buffSize1, maxNbSeq1, maxNbLit1, buffPol2,
1011  params2.cParams, pledgedSrcSize)) {
1012  DEBUGLOG(4, "ZSTD_sufficientBuff() == 0");
1013  return 0;
1014  }
1015  return 1;
1016 }
1017 
1018 static void ZSTD_reset_compressedBlockState(ZSTD_compressedBlockState_t* bs)
1019 {
1020  int i;
1021  for (i = 0; i < ZSTD_REP_NUM; ++i)
1022  bs->rep[i] = repStartValue[i];
1023  bs->entropy.huf.repeatMode = HUF_repeat_none;
1024  bs->entropy.fse.offcode_repeatMode = FSE_repeat_none;
1025  bs->entropy.fse.matchlength_repeatMode = FSE_repeat_none;
1026  bs->entropy.fse.litlength_repeatMode = FSE_repeat_none;
1027 }
1028 
1033 static void ZSTD_invalidateMatchState(ZSTD_matchState_t* ms)
1034 {
1035  ZSTD_window_clear(&ms->window);
1036 
1037  ms->nextToUpdate = ms->window.dictLimit + 1;
1038  ms->nextToUpdate3 = ms->window.dictLimit + 1;
1039  ms->loadedDictEnd = 0;
1040  ms->opt.litLengthSum = 0; /* force reset of btopt stats */
1041  ms->dictMatchState = NULL;
1042 }
1043 
1046 static size_t ZSTD_continueCCtx(ZSTD_CCtx* cctx, ZSTD_CCtx_params params, U64 pledgedSrcSize)
1047 {
1048  size_t const windowSize = MAX(1, (size_t)MIN(((U64)1 << params.cParams.windowLog), pledgedSrcSize));
1049  size_t const blockSize = MIN(ZSTD_BLOCKSIZE_MAX, windowSize);
1050  DEBUGLOG(4, "ZSTD_continueCCtx: re-use context in place");
1051 
1052  cctx->blockSize = blockSize; /* previous block size could be different even for same windowLog, due to pledgedSrcSize */
1053  cctx->appliedParams = params;
1054  cctx->blockState.matchState.cParams = params.cParams;
1055  cctx->pledgedSrcSizePlusOne = pledgedSrcSize+1;
1056  cctx->consumedSrcSize = 0;
1057  cctx->producedCSize = 0;
1058  if (pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN)
1059  cctx->appliedParams.fParams.contentSizeFlag = 0;
1060  DEBUGLOG(4, "pledged content size : %u ; flag : %u",
1061  (U32)pledgedSrcSize, cctx->appliedParams.fParams.contentSizeFlag);
1062  cctx->stage = ZSTDcs_init;
1063  cctx->dictID = 0;
1064  if (params.ldmParams.enableLdm)
1065  ZSTD_window_clear(&cctx->ldmState.window);
1066  ZSTD_referenceExternalSequences(cctx, NULL, 0);
1067  ZSTD_invalidateMatchState(&cctx->blockState.matchState);
1068  ZSTD_reset_compressedBlockState(cctx->blockState.prevCBlock);
1069  XXH64_reset(&cctx->xxhState, 0);
1070  return 0;
1071 }
1072 
1073 typedef enum { ZSTDcrp_continue, ZSTDcrp_noMemset } ZSTD_compResetPolicy_e;
1074 
1075 static void*
1076 ZSTD_reset_matchState(ZSTD_matchState_t* ms,
1077  void* ptr,
1078  const ZSTD_compressionParameters* cParams,
1079  ZSTD_compResetPolicy_e const crp, U32 const forCCtx)
1080 {
1081  size_t const chainSize = (cParams->strategy == ZSTD_fast) ? 0 : ((size_t)1 << cParams->chainLog);
1082  size_t const hSize = ((size_t)1) << cParams->hashLog;
1083  U32 const hashLog3 = (forCCtx && cParams->searchLength==3) ? MIN(ZSTD_HASHLOG3_MAX, cParams->windowLog) : 0;
1084  size_t const h3Size = ((size_t)1) << hashLog3;
1085  size_t const tableSpace = (chainSize + hSize + h3Size) * sizeof(U32);
1086 
1087  assert(((size_t)ptr & 3) == 0);
1088 
1089  ms->hashLog3 = hashLog3;
1090  memset(&ms->window, 0, sizeof(ms->window));
1091  ms->window.dictLimit = 1; /* start from 1, so that 1st position is valid */
1092  ms->window.lowLimit = 1; /* it ensures first and later CCtx usages compress the same */
1093  ms->window.nextSrc = ms->window.base + 1; /* see issue #1241 */
1094  ZSTD_invalidateMatchState(ms);
1095 
1096  /* opt parser space */
1097  if (forCCtx && ((cParams->strategy == ZSTD_btopt) | (cParams->strategy == ZSTD_btultra))) {
1098  DEBUGLOG(4, "reserving optimal parser space");
1099  ms->opt.litFreq = (U32*)ptr;
1100  ms->opt.litLengthFreq = ms->opt.litFreq + (1<<Litbits);
1101  ms->opt.matchLengthFreq = ms->opt.litLengthFreq + (MaxLL+1);
1102  ms->opt.offCodeFreq = ms->opt.matchLengthFreq + (MaxML+1);
1103  ptr = ms->opt.offCodeFreq + (MaxOff+1);
1104  ms->opt.matchTable = (ZSTD_match_t*)ptr;
1105  ptr = ms->opt.matchTable + ZSTD_OPT_NUM+1;
1106  ms->opt.priceTable = (ZSTD_optimal_t*)ptr;
1107  ptr = ms->opt.priceTable + ZSTD_OPT_NUM+1;
1108  }
1109 
1110  /* table Space */
1111  DEBUGLOG(4, "reset table : %u", crp!=ZSTDcrp_noMemset);
1112  assert(((size_t)ptr & 3) == 0); /* ensure ptr is properly aligned */
1113  if (crp!=ZSTDcrp_noMemset) memset(ptr, 0, tableSpace); /* reset tables only */
1114  ms->hashTable = (U32*)(ptr);
1115  ms->chainTable = ms->hashTable + hSize;
1116  ms->hashTable3 = ms->chainTable + chainSize;
1117  ptr = ms->hashTable3 + h3Size;
1118 
1119  ms->cParams = *cParams;
1120 
1121  assert(((size_t)ptr & 3) == 0);
1122  return ptr;
1123 }
1124 
1125 #define ZSTD_WORKSPACETOOLARGE_FACTOR 3 /* define "workspace is too large" as this number of times larger than needed */
1126 #define ZSTD_WORKSPACETOOLARGE_MAXDURATION 128 /* when workspace is continuously too large
1127  * during at least this number of times,
1128  * context's memory usage is considered wasteful,
1129  * because it's sized to handle a worst case scenario which rarely happens.
1130  * In which case, resize it down to free some memory */
1131 
1134 static size_t ZSTD_resetCCtx_internal(ZSTD_CCtx* zc,
1135  ZSTD_CCtx_params params,
1136  U64 pledgedSrcSize,
1137  ZSTD_compResetPolicy_e const crp,
1138  ZSTD_buffered_policy_e const zbuff)
1139 {
1140  DEBUGLOG(4, "ZSTD_resetCCtx_internal: pledgedSrcSize=%u, wlog=%u",
1141  (U32)pledgedSrcSize, params.cParams.windowLog);
1142  assert(!ZSTD_isError(ZSTD_checkCParams(params.cParams)));
1143 
1144  if (crp == ZSTDcrp_continue) {
1145  if (ZSTD_equivalentParams(zc->appliedParams, params,
1146  zc->inBuffSize,
1147  zc->seqStore.maxNbSeq, zc->seqStore.maxNbLit,
1148  zbuff, pledgedSrcSize)) {
1149  DEBUGLOG(4, "ZSTD_equivalentParams()==1 -> continue mode (wLog1=%u, blockSize1=%zu)",
1150  zc->appliedParams.cParams.windowLog, zc->blockSize);
1151  zc->workSpaceOversizedDuration += (zc->workSpaceOversizedDuration > 0); /* if it was too large, it still is */
1152  if (zc->workSpaceOversizedDuration <= ZSTD_WORKSPACETOOLARGE_MAXDURATION)
1153  return ZSTD_continueCCtx(zc, params, pledgedSrcSize);
1154  } }
1155  DEBUGLOG(4, "ZSTD_equivalentParams()==0 -> reset CCtx");
1156 
1157  if (params.ldmParams.enableLdm) {
1158  /* Adjust long distance matching parameters */
1159  ZSTD_ldm_adjustParameters(&params.ldmParams, &params.cParams);
1160  assert(params.ldmParams.hashLog >= params.ldmParams.bucketSizeLog);
1161  assert(params.ldmParams.hashEveryLog < 32);
1162  zc->ldmState.hashPower = ZSTD_ldm_getHashPower(params.ldmParams.minMatchLength);
1163  }
1164 
1165  { size_t const windowSize = MAX(1, (size_t)MIN(((U64)1 << params.cParams.windowLog), pledgedSrcSize));
1166  size_t const blockSize = MIN(ZSTD_BLOCKSIZE_MAX, windowSize);
1167  U32 const divider = (params.cParams.searchLength==3) ? 3 : 4;
1168  size_t const maxNbSeq = blockSize / divider;
1169  size_t const tokenSpace = WILDCOPY_OVERLENGTH + blockSize + 11*maxNbSeq;
1170  size_t const buffOutSize = (zbuff==ZSTDb_buffered) ? ZSTD_compressBound(blockSize)+1 : 0;
1171  size_t const buffInSize = (zbuff==ZSTDb_buffered) ? windowSize + blockSize : 0;
1172  size_t const matchStateSize = ZSTD_sizeof_matchState(&params.cParams, /* forCCtx */ 1);
1173  size_t const maxNbLdmSeq = ZSTD_ldm_getMaxNbSeq(params.ldmParams, blockSize);
1174  void* ptr; /* used to partition workSpace */
1175 
1176  /* Check if workSpace is large enough, alloc a new one if needed */
1177  { size_t const entropySpace = HUF_WORKSPACE_SIZE;
1178  size_t const blockStateSpace = 2 * sizeof(ZSTD_compressedBlockState_t);
1179  size_t const bufferSpace = buffInSize + buffOutSize;
1180  size_t const ldmSpace = ZSTD_ldm_getTableSize(params.ldmParams);
1181  size_t const ldmSeqSpace = maxNbLdmSeq * sizeof(rawSeq);
1182 
1183  size_t const neededSpace = entropySpace + blockStateSpace + ldmSpace +
1184  ldmSeqSpace + matchStateSize + tokenSpace +
1185  bufferSpace;
1186 
1187  int const workSpaceTooSmall = zc->workSpaceSize < neededSpace;
1188  int const workSpaceTooLarge = zc->workSpaceSize > ZSTD_WORKSPACETOOLARGE_FACTOR * neededSpace;
1189  int const workSpaceWasteful = workSpaceTooLarge && (zc->workSpaceOversizedDuration > ZSTD_WORKSPACETOOLARGE_MAXDURATION);
1190  zc->workSpaceOversizedDuration = workSpaceTooLarge ? zc->workSpaceOversizedDuration+1 : 0;
1191 
1192  DEBUGLOG(4, "Need %zuKB workspace, including %zuKB for match state, and %zuKB for buffers",
1193  neededSpace>>10, matchStateSize>>10, bufferSpace>>10);
1194  DEBUGLOG(4, "windowSize: %zu - blockSize: %zu", windowSize, blockSize);
1195 
1196  if (workSpaceTooSmall || workSpaceWasteful) {
1197  DEBUGLOG(4, "Need to resize workSpaceSize from %zuKB to %zuKB",
1198  zc->workSpaceSize >> 10,
1199  neededSpace >> 10);
1200  /* static cctx : no resize, error out */
1201  if (zc->staticSize) return ERROR(memory_allocation);
1202 
1203  zc->workSpaceSize = 0;
1204  ZSTD_free(zc->workSpace, zc->customMem);
1205  zc->workSpace = ZSTD_malloc(neededSpace, zc->customMem);
1206  if (zc->workSpace == NULL) return ERROR(memory_allocation);
1207  zc->workSpaceSize = neededSpace;
1208  zc->workSpaceOversizedDuration = 0;
1209 
1210  /* Statically sized space.
1211  * entropyWorkspace never moves,
1212  * though prev/next block swap places */
1213  assert(((size_t)zc->workSpace & 3) == 0); /* ensure correct alignment */
1214  assert(zc->workSpaceSize >= 2 * sizeof(ZSTD_compressedBlockState_t));
1215  zc->blockState.prevCBlock = (ZSTD_compressedBlockState_t*)zc->workSpace;
1216  zc->blockState.nextCBlock = zc->blockState.prevCBlock + 1;
1217  ptr = zc->blockState.nextCBlock + 1;
1218  zc->entropyWorkspace = (U32*)ptr;
1219  } }
1220 
1221  /* init params */
1222  zc->appliedParams = params;
1223  zc->blockState.matchState.cParams = params.cParams;
1224  zc->pledgedSrcSizePlusOne = pledgedSrcSize+1;
1225  zc->consumedSrcSize = 0;
1226  zc->producedCSize = 0;
1227  if (pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN)
1228  zc->appliedParams.fParams.contentSizeFlag = 0;
1229  DEBUGLOG(4, "pledged content size : %u ; flag : %u",
1230  (U32)pledgedSrcSize, zc->appliedParams.fParams.contentSizeFlag);
1231  zc->blockSize = blockSize;
1232 
1233  XXH64_reset(&zc->xxhState, 0);
1234  zc->stage = ZSTDcs_init;
1235  zc->dictID = 0;
1236 
1237  ZSTD_reset_compressedBlockState(zc->blockState.prevCBlock);
1238 
1239  ptr = zc->entropyWorkspace + HUF_WORKSPACE_SIZE_U32;
1240 
1241  /* ldm hash table */
1242  /* initialize bucketOffsets table later for pointer alignment */
1243  if (params.ldmParams.enableLdm) {
1244  size_t const ldmHSize = ((size_t)1) << params.ldmParams.hashLog;
1245  memset(ptr, 0, ldmHSize * sizeof(ldmEntry_t));
1246  assert(((size_t)ptr & 3) == 0); /* ensure ptr is properly aligned */
1247  zc->ldmState.hashTable = (ldmEntry_t*)ptr;
1248  ptr = zc->ldmState.hashTable + ldmHSize;
1249  zc->ldmSequences = (rawSeq*)ptr;
1250  ptr = zc->ldmSequences + maxNbLdmSeq;
1251  zc->maxNbLdmSequences = maxNbLdmSeq;
1252 
1253  memset(&zc->ldmState.window, 0, sizeof(zc->ldmState.window));
1254  }
1255  assert(((size_t)ptr & 3) == 0); /* ensure ptr is properly aligned */
1256 
1257  ptr = ZSTD_reset_matchState(&zc->blockState.matchState, ptr, &params.cParams, crp, /* forCCtx */ 1);
1258 
1259  /* sequences storage */
1260  zc->seqStore.maxNbSeq = maxNbSeq;
1261  zc->seqStore.sequencesStart = (seqDef*)ptr;
1262  ptr = zc->seqStore.sequencesStart + maxNbSeq;
1263  zc->seqStore.llCode = (BYTE*) ptr;
1264  zc->seqStore.mlCode = zc->seqStore.llCode + maxNbSeq;
1265  zc->seqStore.ofCode = zc->seqStore.mlCode + maxNbSeq;
1266  zc->seqStore.litStart = zc->seqStore.ofCode + maxNbSeq;
1267  /* ZSTD_wildcopy() is used to copy into the literals buffer,
1268  * so we have to oversize the buffer by WILDCOPY_OVERLENGTH bytes.
1269  */
1270  zc->seqStore.maxNbLit = blockSize;
1271  ptr = zc->seqStore.litStart + blockSize + WILDCOPY_OVERLENGTH;
1272 
1273  /* ldm bucketOffsets table */
1274  if (params.ldmParams.enableLdm) {
1275  size_t const ldmBucketSize =
1276  ((size_t)1) << (params.ldmParams.hashLog -
1277  params.ldmParams.bucketSizeLog);
1278  memset(ptr, 0, ldmBucketSize);
1279  zc->ldmState.bucketOffsets = (BYTE*)ptr;
1280  ptr = zc->ldmState.bucketOffsets + ldmBucketSize;
1281  ZSTD_window_clear(&zc->ldmState.window);
1282  }
1283  ZSTD_referenceExternalSequences(zc, NULL, 0);
1284 
1285  /* buffers */
1286  zc->inBuffSize = buffInSize;
1287  zc->inBuff = (char*)ptr;
1288  zc->outBuffSize = buffOutSize;
1289  zc->outBuff = zc->inBuff + buffInSize;
1290 
1291  return 0;
1292  }
1293 }
1294 
1295 /* ZSTD_invalidateRepCodes() :
1296  * ensures next compression will not use repcodes from previous block.
1297  * Note : only works with regular variant;
1298  * do not use with extDict variant ! */
1299 void ZSTD_invalidateRepCodes(ZSTD_CCtx* cctx) {
1300  int i;
1301  for (i=0; i<ZSTD_REP_NUM; i++) cctx->blockState.prevCBlock->rep[i] = 0;
1302  assert(!ZSTD_window_hasExtDict(cctx->blockState.matchState.window));
1303 }
1304 
1305 /* These are the approximate sizes for each strategy past which copying the
1306  * dictionary tables into the working context is faster than using them
1307  * in-place.
1308  */
1309 static const size_t attachDictSizeCutoffs[(unsigned)ZSTD_btultra+1] = {
1310  8 KB, /* unused */
1311  8 KB, /* ZSTD_fast */
1312  16 KB, /* ZSTD_dfast */
1313  32 KB, /* ZSTD_greedy */
1314  32 KB, /* ZSTD_lazy */
1315  32 KB, /* ZSTD_lazy2 */
1316  32 KB, /* ZSTD_btlazy2 */
1317  32 KB, /* ZSTD_btopt */
1318  8 KB /* ZSTD_btultra */
1319 };
1320 
1321 static int ZSTD_shouldAttachDict(const ZSTD_CDict* cdict,
1322  ZSTD_CCtx_params params,
1323  U64 pledgedSrcSize)
1324 {
1325  size_t cutoff = attachDictSizeCutoffs[cdict->matchState.cParams.strategy];
1326  return ( pledgedSrcSize <= cutoff
1327  || pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN
1328  || params.attachDictPref == ZSTD_dictForceAttach )
1329  && params.attachDictPref != ZSTD_dictForceCopy
1330  && !params.forceWindow; /* dictMatchState isn't correctly
1331  * handled in _enforceMaxDist */
1332 }
1333 
1334 static size_t ZSTD_resetCCtx_byAttachingCDict(
1335  ZSTD_CCtx* cctx,
1336  const ZSTD_CDict* cdict,
1337  ZSTD_CCtx_params params,
1338  U64 pledgedSrcSize,
1339  ZSTD_buffered_policy_e zbuff)
1340 {
1341  {
1342  const ZSTD_compressionParameters *cdict_cParams = &cdict->matchState.cParams;
1343  unsigned const windowLog = params.cParams.windowLog;
1344  assert(windowLog != 0);
1345  /* Resize working context table params for input only, since the dict
1346  * has its own tables. */
1347  params.cParams = ZSTD_adjustCParams_internal(*cdict_cParams, pledgedSrcSize, 0);
1348  params.cParams.windowLog = windowLog;
1349  ZSTD_resetCCtx_internal(cctx, params, pledgedSrcSize,
1350  ZSTDcrp_continue, zbuff);
1351  assert(cctx->appliedParams.cParams.strategy == cdict_cParams->strategy);
1352  }
1353 
1354  {
1355  const U32 cdictEnd = (U32)( cdict->matchState.window.nextSrc
1356  - cdict->matchState.window.base);
1357  const U32 cdictLen = cdictEnd - cdict->matchState.window.dictLimit;
1358  if (cdictLen == 0) {
1359  /* don't even attach dictionaries with no contents */
1360  DEBUGLOG(4, "skipping attaching empty dictionary");
1361  } else {
1362  DEBUGLOG(4, "attaching dictionary into context");
1363  cctx->blockState.matchState.dictMatchState = &cdict->matchState;
1364 
1365  /* prep working match state so dict matches never have negative indices
1366  * when they are translated to the working context's index space. */
1367  if (cctx->blockState.matchState.window.dictLimit < cdictEnd) {
1368  cctx->blockState.matchState.window.nextSrc =
1369  cctx->blockState.matchState.window.base + cdictEnd;
1370  ZSTD_window_clear(&cctx->blockState.matchState.window);
1371  }
1372  cctx->blockState.matchState.loadedDictEnd = cctx->blockState.matchState.window.dictLimit;
1373  }
1374  }
1375 
1376  cctx->dictID = cdict->dictID;
1377 
1378  /* copy block state */
1379  memcpy(cctx->blockState.prevCBlock, &cdict->cBlockState, sizeof(cdict->cBlockState));
1380 
1381  return 0;
1382 }
1383 
1384 static size_t ZSTD_resetCCtx_byCopyingCDict(ZSTD_CCtx* cctx,
1385  const ZSTD_CDict* cdict,
1386  ZSTD_CCtx_params params,
1387  U64 pledgedSrcSize,
1388  ZSTD_buffered_policy_e zbuff)
1389 {
1390  const ZSTD_compressionParameters *cdict_cParams = &cdict->matchState.cParams;
1391 
1392  DEBUGLOG(4, "copying dictionary into context");
1393 
1394  { unsigned const windowLog = params.cParams.windowLog;
1395  assert(windowLog != 0);
1396  /* Copy only compression parameters related to tables. */
1397  params.cParams = *cdict_cParams;
1398  params.cParams.windowLog = windowLog;
1399  ZSTD_resetCCtx_internal(cctx, params, pledgedSrcSize,
1400  ZSTDcrp_noMemset, zbuff);
1401  assert(cctx->appliedParams.cParams.strategy == cdict_cParams->strategy);
1402  assert(cctx->appliedParams.cParams.hashLog == cdict_cParams->hashLog);
1403  assert(cctx->appliedParams.cParams.chainLog == cdict_cParams->chainLog);
1404  }
1405 
1406  /* copy tables */
1407  { size_t const chainSize = (cdict_cParams->strategy == ZSTD_fast) ? 0 : ((size_t)1 << cdict_cParams->chainLog);
1408  size_t const hSize = (size_t)1 << cdict_cParams->hashLog;
1409  size_t const tableSpace = (chainSize + hSize) * sizeof(U32);
1410  assert((U32*)cctx->blockState.matchState.chainTable == (U32*)cctx->blockState.matchState.hashTable + hSize); /* chainTable must follow hashTable */
1411  assert((U32*)cctx->blockState.matchState.hashTable3 == (U32*)cctx->blockState.matchState.chainTable + chainSize);
1412  assert((U32*)cdict->matchState.chainTable == (U32*)cdict->matchState.hashTable + hSize); /* chainTable must follow hashTable */
1413  assert((U32*)cdict->matchState.hashTable3 == (U32*)cdict->matchState.chainTable + chainSize);
1414  memcpy(cctx->blockState.matchState.hashTable, cdict->matchState.hashTable, tableSpace); /* presumes all tables follow each other */
1415  }
1416 
1417  /* Zero the hashTable3, since the cdict never fills it */
1418  { size_t const h3Size = (size_t)1 << cctx->blockState.matchState.hashLog3;
1419  assert(cdict->matchState.hashLog3 == 0);
1420  memset(cctx->blockState.matchState.hashTable3, 0, h3Size * sizeof(U32));
1421  }
1422 
1423  /* copy dictionary offsets */
1424  { ZSTD_matchState_t const* srcMatchState = &cdict->matchState;
1425  ZSTD_matchState_t* dstMatchState = &cctx->blockState.matchState;
1426  dstMatchState->window = srcMatchState->window;
1427  dstMatchState->nextToUpdate = srcMatchState->nextToUpdate;
1428  dstMatchState->nextToUpdate3= srcMatchState->nextToUpdate3;
1429  dstMatchState->loadedDictEnd= srcMatchState->loadedDictEnd;
1430  }
1431 
1432  cctx->dictID = cdict->dictID;
1433 
1434  /* copy block state */
1435  memcpy(cctx->blockState.prevCBlock, &cdict->cBlockState, sizeof(cdict->cBlockState));
1436 
1437  return 0;
1438 }
1439 
1440 /* We have a choice between copying the dictionary context into the working
1441  * context, or referencing the dictionary context from the working context
1442  * in-place. We decide here which strategy to use. */
1443 static size_t ZSTD_resetCCtx_usingCDict(ZSTD_CCtx* cctx,
1444  const ZSTD_CDict* cdict,
1445  ZSTD_CCtx_params params,
1446  U64 pledgedSrcSize,
1447  ZSTD_buffered_policy_e zbuff)
1448 {
1449 
1450  DEBUGLOG(4, "ZSTD_resetCCtx_usingCDict (pledgedSrcSize=%u)", (U32)pledgedSrcSize);
1451 
1452  if (ZSTD_shouldAttachDict(cdict, params, pledgedSrcSize)) {
1453  return ZSTD_resetCCtx_byAttachingCDict(
1454  cctx, cdict, params, pledgedSrcSize, zbuff);
1455  } else {
1456  return ZSTD_resetCCtx_byCopyingCDict(
1457  cctx, cdict, params, pledgedSrcSize, zbuff);
1458  }
1459 }
1460 
1468 static size_t ZSTD_copyCCtx_internal(ZSTD_CCtx* dstCCtx,
1469  const ZSTD_CCtx* srcCCtx,
1470  ZSTD_frameParameters fParams,
1471  U64 pledgedSrcSize,
1472  ZSTD_buffered_policy_e zbuff)
1473 {
1474  DEBUGLOG(5, "ZSTD_copyCCtx_internal");
1475  if (srcCCtx->stage!=ZSTDcs_init) return ERROR(stage_wrong);
1476 
1477  memcpy(&dstCCtx->customMem, &srcCCtx->customMem, sizeof(ZSTD_customMem));
1478  { ZSTD_CCtx_params params = dstCCtx->requestedParams;
1479  /* Copy only compression parameters related to tables. */
1480  params.cParams = srcCCtx->appliedParams.cParams;
1481  params.fParams = fParams;
1482  ZSTD_resetCCtx_internal(dstCCtx, params, pledgedSrcSize,
1483  ZSTDcrp_noMemset, zbuff);
1484  assert(dstCCtx->appliedParams.cParams.windowLog == srcCCtx->appliedParams.cParams.windowLog);
1485  assert(dstCCtx->appliedParams.cParams.strategy == srcCCtx->appliedParams.cParams.strategy);
1486  assert(dstCCtx->appliedParams.cParams.hashLog == srcCCtx->appliedParams.cParams.hashLog);
1487  assert(dstCCtx->appliedParams.cParams.chainLog == srcCCtx->appliedParams.cParams.chainLog);
1488  assert(dstCCtx->blockState.matchState.hashLog3 == srcCCtx->blockState.matchState.hashLog3);
1489  }
1490 
1491  /* copy tables */
1492  { size_t const chainSize = (srcCCtx->appliedParams.cParams.strategy == ZSTD_fast) ? 0 : ((size_t)1 << srcCCtx->appliedParams.cParams.chainLog);
1493  size_t const hSize = (size_t)1 << srcCCtx->appliedParams.cParams.hashLog;
1494  size_t const h3Size = (size_t)1 << srcCCtx->blockState.matchState.hashLog3;
1495  size_t const tableSpace = (chainSize + hSize + h3Size) * sizeof(U32);
1496  assert((U32*)dstCCtx->blockState.matchState.chainTable == (U32*)dstCCtx->blockState.matchState.hashTable + hSize); /* chainTable must follow hashTable */
1497  assert((U32*)dstCCtx->blockState.matchState.hashTable3 == (U32*)dstCCtx->blockState.matchState.chainTable + chainSize);
1498  memcpy(dstCCtx->blockState.matchState.hashTable, srcCCtx->blockState.matchState.hashTable, tableSpace); /* presumes all tables follow each other */
1499  }
1500 
1501  /* copy dictionary offsets */
1502  {
1503  const ZSTD_matchState_t* srcMatchState = &srcCCtx->blockState.matchState;
1504  ZSTD_matchState_t* dstMatchState = &dstCCtx->blockState.matchState;
1505  dstMatchState->window = srcMatchState->window;
1506  dstMatchState->nextToUpdate = srcMatchState->nextToUpdate;
1507  dstMatchState->nextToUpdate3= srcMatchState->nextToUpdate3;
1508  dstMatchState->loadedDictEnd= srcMatchState->loadedDictEnd;
1509  }
1510  dstCCtx->dictID = srcCCtx->dictID;
1511 
1512  /* copy block state */
1513  memcpy(dstCCtx->blockState.prevCBlock, srcCCtx->blockState.prevCBlock, sizeof(*srcCCtx->blockState.prevCBlock));
1514 
1515  return 0;
1516 }
1517 
1523 size_t ZSTD_copyCCtx(ZSTD_CCtx* dstCCtx, const ZSTD_CCtx* srcCCtx, unsigned long long pledgedSrcSize)
1524 {
1525  ZSTD_frameParameters fParams = { 1 /*content*/, 0 /*checksum*/, 0 /*noDictID*/ };
1526  ZSTD_buffered_policy_e const zbuff = (ZSTD_buffered_policy_e)(srcCCtx->inBuffSize>0);
1527  ZSTD_STATIC_ASSERT((U32)ZSTDb_buffered==1);
1528  if (pledgedSrcSize==0) pledgedSrcSize = ZSTD_CONTENTSIZE_UNKNOWN;
1529  fParams.contentSizeFlag = (pledgedSrcSize != ZSTD_CONTENTSIZE_UNKNOWN);
1530 
1531  return ZSTD_copyCCtx_internal(dstCCtx, srcCCtx,
1532  fParams, pledgedSrcSize,
1533  zbuff);
1534 }
1535 
1536 
1537 #define ZSTD_ROWSIZE 16
1538 
1544 FORCE_INLINE_TEMPLATE void
1545 ZSTD_reduceTable_internal (U32* const table, U32 const size, U32 const reducerValue, int const preserveMark)
1546 {
1547  int const nbRows = (int)size / ZSTD_ROWSIZE;
1548  int cellNb = 0;
1549  int rowNb;
1550  assert((size & (ZSTD_ROWSIZE-1)) == 0); /* multiple of ZSTD_ROWSIZE */
1551  assert(size < (1U<<31)); /* can be casted to int */
1552  for (rowNb=0 ; rowNb < nbRows ; rowNb++) {
1553  int column;
1554  for (column=0; column<ZSTD_ROWSIZE; column++) {
1555  if (preserveMark) {
1556  U32 const adder = (table[cellNb] == ZSTD_DUBT_UNSORTED_MARK) ? reducerValue : 0;
1557  table[cellNb] += adder;
1558  }
1559  if (table[cellNb] < reducerValue) table[cellNb] = 0;
1560  else table[cellNb] -= reducerValue;
1561  cellNb++;
1562  } }
1563 }
1564 
1565 static void ZSTD_reduceTable(U32* const table, U32 const size, U32 const reducerValue)
1566 {
1567  ZSTD_reduceTable_internal(table, size, reducerValue, 0);
1568 }
1569 
1570 static void ZSTD_reduceTable_btlazy2(U32* const table, U32 const size, U32 const reducerValue)
1571 {
1572  ZSTD_reduceTable_internal(table, size, reducerValue, 1);
1573 }
1574 
1577 static void ZSTD_reduceIndex (ZSTD_CCtx* zc, const U32 reducerValue)
1578 {
1579  ZSTD_matchState_t* const ms = &zc->blockState.matchState;
1580  { U32 const hSize = (U32)1 << zc->appliedParams.cParams.hashLog;
1581  ZSTD_reduceTable(ms->hashTable, hSize, reducerValue);
1582  }
1583 
1584  if (zc->appliedParams.cParams.strategy != ZSTD_fast) {
1585  U32 const chainSize = (U32)1 << zc->appliedParams.cParams.chainLog;
1586  if (zc->appliedParams.cParams.strategy == ZSTD_btlazy2)
1587  ZSTD_reduceTable_btlazy2(ms->chainTable, chainSize, reducerValue);
1588  else
1589  ZSTD_reduceTable(ms->chainTable, chainSize, reducerValue);
1590  }
1591 
1592  if (ms->hashLog3) {
1593  U32 const h3Size = (U32)1 << ms->hashLog3;
1594  ZSTD_reduceTable(ms->hashTable3, h3Size, reducerValue);
1595  }
1596 }
1597 
1598 
1599 /*-*******************************************************
1600 * Block entropic compression
1601 *********************************************************/
1602 
1603 /* See doc/zstd_compression_format.md for detailed format description */
1604 
1605 static size_t ZSTD_noCompressBlock (void* dst, size_t dstCapacity, const void* src, size_t srcSize, U32 lastBlock)
1606 {
1607  U32 const cBlockHeader24 = lastBlock + (((U32)bt_raw)<<1) + (U32)(srcSize << 3);
1608  if (srcSize + ZSTD_blockHeaderSize > dstCapacity) return ERROR(dstSize_tooSmall);
1609  MEM_writeLE24(dst, cBlockHeader24);
1610  memcpy((BYTE*)dst + ZSTD_blockHeaderSize, src, srcSize);
1611  return ZSTD_blockHeaderSize + srcSize;
1612 }
1613 
1614 static size_t ZSTD_noCompressLiterals (void* dst, size_t dstCapacity, const void* src, size_t srcSize)
1615 {
1616  BYTE* const ostart = (BYTE* const)dst;
1617  U32 const flSize = 1 + (srcSize>31) + (srcSize>4095);
1618 
1619  if (srcSize + flSize > dstCapacity) return ERROR(dstSize_tooSmall);
1620 
1621  switch(flSize)
1622  {
1623  case 1: /* 2 - 1 - 5 */
1624  ostart[0] = (BYTE)((U32)set_basic + (srcSize<<3));
1625  break;
1626  case 2: /* 2 - 2 - 12 */
1627  MEM_writeLE16(ostart, (U16)((U32)set_basic + (1<<2) + (srcSize<<4)));
1628  break;
1629  case 3: /* 2 - 2 - 20 */
1630  MEM_writeLE32(ostart, (U32)((U32)set_basic + (3<<2) + (srcSize<<4)));
1631  break;
1632  default: /* not necessary : flSize is {1,2,3} */
1633  assert(0);
1634  }
1635 
1636  memcpy(ostart + flSize, src, srcSize);
1637  return srcSize + flSize;
1638 }
1639 
1640 static size_t ZSTD_compressRleLiteralsBlock (void* dst, size_t dstCapacity, const void* src, size_t srcSize)
1641 {
1642  BYTE* const ostart = (BYTE* const)dst;
1643  U32 const flSize = 1 + (srcSize>31) + (srcSize>4095);
1644 
1645  (void)dstCapacity; /* dstCapacity already guaranteed to be >=4, hence large enough */
1646 
1647  switch(flSize)
1648  {
1649  case 1: /* 2 - 1 - 5 */
1650  ostart[0] = (BYTE)((U32)set_rle + (srcSize<<3));
1651  break;
1652  case 2: /* 2 - 2 - 12 */
1653  MEM_writeLE16(ostart, (U16)((U32)set_rle + (1<<2) + (srcSize<<4)));
1654  break;
1655  case 3: /* 2 - 2 - 20 */
1656  MEM_writeLE32(ostart, (U32)((U32)set_rle + (3<<2) + (srcSize<<4)));
1657  break;
1658  default: /* not necessary : flSize is {1,2,3} */
1659  assert(0);
1660  }
1661 
1662  ostart[flSize] = *(const BYTE*)src;
1663  return flSize+1;
1664 }
1665 
1666 
1667 /* ZSTD_minGain() :
1668  * minimum compression required
1669  * to generate a compress block or a compressed literals section.
1670  * note : use same formula for both situations */
1671 static size_t ZSTD_minGain(size_t srcSize, ZSTD_strategy strat)
1672 {
1673  U32 const minlog = (strat==ZSTD_btultra) ? 7 : 6;
1674  return (srcSize >> minlog) + 2;
1675 }
1676 
1677 static size_t ZSTD_compressLiterals (ZSTD_hufCTables_t const* prevHuf,
1678  ZSTD_hufCTables_t* nextHuf,
1679  ZSTD_strategy strategy, int disableLiteralCompression,
1680  void* dst, size_t dstCapacity,
1681  const void* src, size_t srcSize,
1682  U32* workspace, const int bmi2)
1683 {
1684  size_t const minGain = ZSTD_minGain(srcSize, strategy);
1685  size_t const lhSize = 3 + (srcSize >= 1 KB) + (srcSize >= 16 KB);
1686  BYTE* const ostart = (BYTE*)dst;
1687  U32 singleStream = srcSize < 256;
1688  symbolEncodingType_e hType = set_compressed;
1689  size_t cLitSize;
1690 
1691  DEBUGLOG(5,"ZSTD_compressLiterals (disableLiteralCompression=%i)",
1692  disableLiteralCompression);
1693 
1694  /* Prepare nextEntropy assuming reusing the existing table */
1695  memcpy(nextHuf, prevHuf, sizeof(*prevHuf));
1696 
1697  if (disableLiteralCompression)
1698  return ZSTD_noCompressLiterals(dst, dstCapacity, src, srcSize);
1699 
1700  /* small ? don't even attempt compression (speed opt) */
1701 # define COMPRESS_LITERALS_SIZE_MIN 63
1702  { size_t const minLitSize = (prevHuf->repeatMode == HUF_repeat_valid) ? 6 : COMPRESS_LITERALS_SIZE_MIN;
1703  if (srcSize <= minLitSize) return ZSTD_noCompressLiterals(dst, dstCapacity, src, srcSize);
1704  }
1705 
1706  if (dstCapacity < lhSize+1) return ERROR(dstSize_tooSmall); /* not enough space for compression */
1707  { HUF_repeat repeat = prevHuf->repeatMode;
1708  int const preferRepeat = strategy < ZSTD_lazy ? srcSize <= 1024 : 0;
1709  if (repeat == HUF_repeat_valid && lhSize == 3) singleStream = 1;
1710  cLitSize = singleStream ? HUF_compress1X_repeat(ostart+lhSize, dstCapacity-lhSize, src, srcSize, 255, 11,
1711  workspace, HUF_WORKSPACE_SIZE, (HUF_CElt*)nextHuf->CTable, &repeat, preferRepeat, bmi2)
1712  : HUF_compress4X_repeat(ostart+lhSize, dstCapacity-lhSize, src, srcSize, 255, 11,
1713  workspace, HUF_WORKSPACE_SIZE, (HUF_CElt*)nextHuf->CTable, &repeat, preferRepeat, bmi2);
1714  if (repeat != HUF_repeat_none) {
1715  /* reused the existing table */
1716  hType = set_repeat;
1717  }
1718  }
1719 
1720  if ((cLitSize==0) | (cLitSize >= srcSize - minGain) | ERR_isError(cLitSize)) {
1721  memcpy(nextHuf, prevHuf, sizeof(*prevHuf));
1722  return ZSTD_noCompressLiterals(dst, dstCapacity, src, srcSize);
1723  }
1724  if (cLitSize==1) {
1725  memcpy(nextHuf, prevHuf, sizeof(*prevHuf));
1726  return ZSTD_compressRleLiteralsBlock(dst, dstCapacity, src, srcSize);
1727  }
1728 
1729  if (hType == set_compressed) {
1730  /* using a newly constructed table */
1731  nextHuf->repeatMode = HUF_repeat_check;
1732  }
1733 
1734  /* Build header */
1735  switch(lhSize)
1736  {
1737  case 3: /* 2 - 2 - 10 - 10 */
1738  { U32 const lhc = hType + ((!singleStream) << 2) + ((U32)srcSize<<4) + ((U32)cLitSize<<14);
1739  MEM_writeLE24(ostart, lhc);
1740  break;
1741  }
1742  case 4: /* 2 - 2 - 14 - 14 */
1743  { U32 const lhc = hType + (2 << 2) + ((U32)srcSize<<4) + ((U32)cLitSize<<18);
1744  MEM_writeLE32(ostart, lhc);
1745  break;
1746  }
1747  case 5: /* 2 - 2 - 18 - 18 */
1748  { U32 const lhc = hType + (3 << 2) + ((U32)srcSize<<4) + ((U32)cLitSize<<22);
1749  MEM_writeLE32(ostart, lhc);
1750  ostart[4] = (BYTE)(cLitSize >> 10);
1751  break;
1752  }
1753  default: /* not possible : lhSize is {3,4,5} */
1754  assert(0);
1755  }
1756  return lhSize+cLitSize;
1757 }
1758 
1759 
1760 void ZSTD_seqToCodes(const seqStore_t* seqStorePtr)
1761 {
1762  const seqDef* const sequences = seqStorePtr->sequencesStart;
1763  BYTE* const llCodeTable = seqStorePtr->llCode;
1764  BYTE* const ofCodeTable = seqStorePtr->ofCode;
1765  BYTE* const mlCodeTable = seqStorePtr->mlCode;
1766  U32 const nbSeq = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
1767  U32 u;
1768  assert(nbSeq <= seqStorePtr->maxNbSeq);
1769  for (u=0; u<nbSeq; u++) {
1770  U32 const llv = sequences[u].litLength;
1771  U32 const mlv = sequences[u].matchLength;
1772  llCodeTable[u] = (BYTE)ZSTD_LLcode(llv);
1773  ofCodeTable[u] = (BYTE)ZSTD_highbit32(sequences[u].offset);
1774  mlCodeTable[u] = (BYTE)ZSTD_MLcode(mlv);
1775  }
1776  if (seqStorePtr->longLengthID==1)
1777  llCodeTable[seqStorePtr->longLengthPos] = MaxLL;
1778  if (seqStorePtr->longLengthID==2)
1779  mlCodeTable[seqStorePtr->longLengthPos] = MaxML;
1780 }
1781 
1782 
1788 static unsigned const kInverseProbabiltyLog256[256] = {
1789  0, 2048, 1792, 1642, 1536, 1453, 1386, 1329, 1280, 1236, 1197, 1162,
1790  1130, 1100, 1073, 1047, 1024, 1001, 980, 960, 941, 923, 906, 889,
1791  874, 859, 844, 830, 817, 804, 791, 779, 768, 756, 745, 734,
1792  724, 714, 704, 694, 685, 676, 667, 658, 650, 642, 633, 626,
1793  618, 610, 603, 595, 588, 581, 574, 567, 561, 554, 548, 542,
1794  535, 529, 523, 517, 512, 506, 500, 495, 489, 484, 478, 473,
1795  468, 463, 458, 453, 448, 443, 438, 434, 429, 424, 420, 415,
1796  411, 407, 402, 398, 394, 390, 386, 382, 377, 373, 370, 366,
1797  362, 358, 354, 350, 347, 343, 339, 336, 332, 329, 325, 322,
1798  318, 315, 311, 308, 305, 302, 298, 295, 292, 289, 286, 282,
1799  279, 276, 273, 270, 267, 264, 261, 258, 256, 253, 250, 247,
1800  244, 241, 239, 236, 233, 230, 228, 225, 222, 220, 217, 215,
1801  212, 209, 207, 204, 202, 199, 197, 194, 192, 190, 187, 185,
1802  182, 180, 178, 175, 173, 171, 168, 166, 164, 162, 159, 157,
1803  155, 153, 151, 149, 146, 144, 142, 140, 138, 136, 134, 132,
1804  130, 128, 126, 123, 121, 119, 117, 115, 114, 112, 110, 108,
1805  106, 104, 102, 100, 98, 96, 94, 93, 91, 89, 87, 85,
1806  83, 82, 80, 78, 76, 74, 73, 71, 69, 67, 66, 64,
1807  62, 61, 59, 57, 55, 54, 52, 50, 49, 47, 46, 44,
1808  42, 41, 39, 37, 36, 34, 33, 31, 30, 28, 26, 25,
1809  23, 22, 20, 19, 17, 16, 14, 13, 11, 10, 8, 7,
1810  5, 4, 2, 1,
1811 };
1812 
1813 
1818 static size_t ZSTD_entropyCost(unsigned const* count, unsigned const max, size_t const total)
1819 {
1820  unsigned cost = 0;
1821  unsigned s;
1822  for (s = 0; s <= max; ++s) {
1823  unsigned norm = (unsigned)((256 * count[s]) / total);
1824  if (count[s] != 0 && norm == 0)
1825  norm = 1;
1826  assert(count[s] < total);
1827  cost += count[s] * kInverseProbabiltyLog256[norm];
1828  }
1829  return cost >> 8;
1830 }
1831 
1832 
1838 static size_t ZSTD_crossEntropyCost(short const* norm, unsigned accuracyLog,
1839  unsigned const* count, unsigned const max)
1840 {
1841  unsigned const shift = 8 - accuracyLog;
1842  size_t cost = 0;
1843  unsigned s;
1844  assert(accuracyLog <= 8);
1845  for (s = 0; s <= max; ++s) {
1846  unsigned const normAcc = norm[s] != -1 ? norm[s] : 1;
1847  unsigned const norm256 = normAcc << shift;
1848  assert(norm256 > 0);
1849  assert(norm256 < 256);
1850  cost += count[s] * kInverseProbabiltyLog256[norm256];
1851  }
1852  return cost >> 8;
1853 }
1854 
1855 
1856 static unsigned ZSTD_getFSEMaxSymbolValue(FSE_CTable const* ctable) {
1857  void const* ptr = ctable;
1858  U16 const* u16ptr = (U16 const*)ptr;
1859  U32 const maxSymbolValue = MEM_read16(u16ptr + 1);
1860  return maxSymbolValue;
1861 }
1862 
1863 
1868 static size_t ZSTD_fseBitCost(
1869  FSE_CTable const* ctable,
1870  unsigned const* count,
1871  unsigned const max)
1872 {
1873  unsigned const kAccuracyLog = 8;
1874  size_t cost = 0;
1875  unsigned s;
1876  FSE_CState_t cstate;
1877  FSE_initCState(&cstate, ctable);
1878  if (ZSTD_getFSEMaxSymbolValue(ctable) < max) {
1879  DEBUGLOG(5, "Repeat FSE_CTable has maxSymbolValue %u < %u",
1880  ZSTD_getFSEMaxSymbolValue(ctable), max);
1881  return ERROR(GENERIC);
1882  }
1883  for (s = 0; s <= max; ++s) {
1884  unsigned const tableLog = cstate.stateLog;
1885  unsigned const badCost = (tableLog + 1) << kAccuracyLog;
1886  unsigned const bitCost = FSE_bitCost(cstate.symbolTT, tableLog, s, kAccuracyLog);
1887  if (count[s] == 0)
1888  continue;
1889  if (bitCost >= badCost) {
1890  DEBUGLOG(5, "Repeat FSE_CTable has Prob[%u] == 0", s);
1891  return ERROR(GENERIC);
1892  }
1893  cost += count[s] * bitCost;
1894  }
1895  return cost >> kAccuracyLog;
1896 }
1897 
1902 static size_t ZSTD_NCountCost(unsigned const* count, unsigned const max,
1903  size_t const nbSeq, unsigned const FSELog)
1904 {
1905  BYTE wksp[FSE_NCOUNTBOUND];
1906  S16 norm[MaxSeq + 1];
1907  const U32 tableLog = FSE_optimalTableLog(FSELog, nbSeq, max);
1908  CHECK_F(FSE_normalizeCount(norm, tableLog, count, nbSeq, max));
1909  return FSE_writeNCount(wksp, sizeof(wksp), norm, max, tableLog);
1910 }
1911 
1912 
1913 typedef enum {
1914  ZSTD_defaultDisallowed = 0,
1915  ZSTD_defaultAllowed = 1
1916 } ZSTD_defaultPolicy_e;
1917 
1918 MEM_STATIC symbolEncodingType_e
1919 ZSTD_selectEncodingType(
1920  FSE_repeat* repeatMode, unsigned const* count, unsigned const max,
1921  size_t const mostFrequent, size_t nbSeq, unsigned const FSELog,
1922  FSE_CTable const* prevCTable,
1923  short const* defaultNorm, U32 defaultNormLog,
1924  ZSTD_defaultPolicy_e const isDefaultAllowed,
1925  ZSTD_strategy const strategy)
1926 {
1927  ZSTD_STATIC_ASSERT(ZSTD_defaultDisallowed == 0 && ZSTD_defaultAllowed != 0);
1928  if (mostFrequent == nbSeq) {
1929  *repeatMode = FSE_repeat_none;
1930  if (isDefaultAllowed && nbSeq <= 2) {
1931  /* Prefer set_basic over set_rle when there are 2 or less symbols,
1932  * since RLE uses 1 byte, but set_basic uses 5-6 bits per symbol.
1933  * If basic encoding isn't possible, always choose RLE.
1934  */
1935  DEBUGLOG(5, "Selected set_basic");
1936  return set_basic;
1937  }
1938  DEBUGLOG(5, "Selected set_rle");
1939  return set_rle;
1940  }
1941  if (strategy < ZSTD_lazy) {
1942  if (isDefaultAllowed) {
1943  size_t const staticFse_nbSeq_max = 1000;
1944  size_t const mult = 10 - strategy;
1945  size_t const baseLog = 3;
1946  size_t const dynamicFse_nbSeq_min = (((size_t)1 << defaultNormLog) * mult) >> baseLog; /* 28-36 for offset, 56-72 for lengths */
1947  assert(defaultNormLog >= 5 && defaultNormLog <= 6); /* xx_DEFAULTNORMLOG */
1948  assert(mult <= 9 && mult >= 7);
1949  if ( (*repeatMode == FSE_repeat_valid)
1950  && (nbSeq < staticFse_nbSeq_max) ) {
1951  DEBUGLOG(5, "Selected set_repeat");
1952  return set_repeat;
1953  }
1954  if ( (nbSeq < dynamicFse_nbSeq_min)
1955  || (mostFrequent < (nbSeq >> (defaultNormLog-1))) ) {
1956  DEBUGLOG(5, "Selected set_basic");
1957  /* The format allows default tables to be repeated, but it isn't useful.
1958  * When using simple heuristics to select encoding type, we don't want
1959  * to confuse these tables with dictionaries. When running more careful
1960  * analysis, we don't need to waste time checking both repeating tables
1961  * and default tables.
1962  */
1963  *repeatMode = FSE_repeat_none;
1964  return set_basic;
1965  }
1966  }
1967  } else {
1968  size_t const basicCost = isDefaultAllowed ? ZSTD_crossEntropyCost(defaultNorm, defaultNormLog, count, max) : ERROR(GENERIC);
1969  size_t const repeatCost = *repeatMode != FSE_repeat_none ? ZSTD_fseBitCost(prevCTable, count, max) : ERROR(GENERIC);
1970  size_t const NCountCost = ZSTD_NCountCost(count, max, nbSeq, FSELog);
1971  size_t const compressedCost = (NCountCost << 3) + ZSTD_entropyCost(count, max, nbSeq);
1972 
1973  if (isDefaultAllowed) {
1974  assert(!ZSTD_isError(basicCost));
1975  assert(!(*repeatMode == FSE_repeat_valid && ZSTD_isError(repeatCost)));
1976  }
1977  assert(!ZSTD_isError(NCountCost));
1978  assert(compressedCost < ERROR(maxCode));
1979  DEBUGLOG(5, "Estimated bit costs: basic=%u\trepeat=%u\tcompressed=%u",
1980  (U32)basicCost, (U32)repeatCost, (U32)compressedCost);
1981  if (basicCost <= repeatCost && basicCost <= compressedCost) {
1982  DEBUGLOG(5, "Selected set_basic");
1983  assert(isDefaultAllowed);
1984  *repeatMode = FSE_repeat_none;
1985  return set_basic;
1986  }
1987  if (repeatCost <= compressedCost) {
1988  DEBUGLOG(5, "Selected set_repeat");
1989  assert(!ZSTD_isError(repeatCost));
1990  return set_repeat;
1991  }
1992  assert(compressedCost < basicCost && compressedCost < repeatCost);
1993  }
1994  DEBUGLOG(5, "Selected set_compressed");
1995  *repeatMode = FSE_repeat_check;
1996  return set_compressed;
1997 }
1998 
1999 MEM_STATIC size_t
2000 ZSTD_buildCTable(void* dst, size_t dstCapacity,
2001  FSE_CTable* nextCTable, U32 FSELog, symbolEncodingType_e type,
2002  U32* count, U32 max,
2003  const BYTE* codeTable, size_t nbSeq,
2004  const S16* defaultNorm, U32 defaultNormLog, U32 defaultMax,
2005  const FSE_CTable* prevCTable, size_t prevCTableSize,
2006  void* workspace, size_t workspaceSize)
2007 {
2008  BYTE* op = (BYTE*)dst;
2009  const BYTE* const oend = op + dstCapacity;
2010 
2011  switch (type) {
2012  case set_rle:
2013  *op = codeTable[0];
2014  CHECK_F(FSE_buildCTable_rle(nextCTable, (BYTE)max));
2015  return 1;
2016  case set_repeat:
2017  memcpy(nextCTable, prevCTable, prevCTableSize);
2018  return 0;
2019  case set_basic:
2020  CHECK_F(FSE_buildCTable_wksp(nextCTable, defaultNorm, defaultMax, defaultNormLog, workspace, workspaceSize)); /* note : could be pre-calculated */
2021  return 0;
2022  case set_compressed: {
2023  S16 norm[MaxSeq + 1];
2024  size_t nbSeq_1 = nbSeq;
2025  const U32 tableLog = FSE_optimalTableLog(FSELog, nbSeq, max);
2026  if (count[codeTable[nbSeq-1]] > 1) {
2027  count[codeTable[nbSeq-1]]--;
2028  nbSeq_1--;
2029  }
2030  assert(nbSeq_1 > 1);
2031  CHECK_F(FSE_normalizeCount(norm, tableLog, count, nbSeq_1, max));
2032  { size_t const NCountSize = FSE_writeNCount(op, oend - op, norm, max, tableLog); /* overflow protected */
2033  if (FSE_isError(NCountSize)) return NCountSize;
2034  CHECK_F(FSE_buildCTable_wksp(nextCTable, norm, max, tableLog, workspace, workspaceSize));
2035  return NCountSize;
2036  }
2037  }
2038  default: return assert(0), ERROR(GENERIC);
2039  }
2040 }
2041 
2042 FORCE_INLINE_TEMPLATE size_t
2043 ZSTD_encodeSequences_body(
2044  void* dst, size_t dstCapacity,
2045  FSE_CTable const* CTable_MatchLength, BYTE const* mlCodeTable,
2046  FSE_CTable const* CTable_OffsetBits, BYTE const* ofCodeTable,
2047  FSE_CTable const* CTable_LitLength, BYTE const* llCodeTable,
2048  seqDef const* sequences, size_t nbSeq, int longOffsets)
2049 {
2050  BIT_CStream_t blockStream;
2051  FSE_CState_t stateMatchLength;
2052  FSE_CState_t stateOffsetBits;
2053  FSE_CState_t stateLitLength;
2054 
2055  CHECK_E(BIT_initCStream(&blockStream, dst, dstCapacity), dstSize_tooSmall); /* not enough space remaining */
2056 
2057  /* first symbols */
2058  FSE_initCState2(&stateMatchLength, CTable_MatchLength, mlCodeTable[nbSeq-1]);
2059  FSE_initCState2(&stateOffsetBits, CTable_OffsetBits, ofCodeTable[nbSeq-1]);
2060  FSE_initCState2(&stateLitLength, CTable_LitLength, llCodeTable[nbSeq-1]);
2061  BIT_addBits(&blockStream, sequences[nbSeq-1].litLength, LL_bits[llCodeTable[nbSeq-1]]);
2062  if (MEM_32bits()) BIT_flushBits(&blockStream);
2063  BIT_addBits(&blockStream, sequences[nbSeq-1].matchLength, ML_bits[mlCodeTable[nbSeq-1]]);
2064  if (MEM_32bits()) BIT_flushBits(&blockStream);
2065  if (longOffsets) {
2066  U32 const ofBits = ofCodeTable[nbSeq-1];
2067  int const extraBits = ofBits - MIN(ofBits, STREAM_ACCUMULATOR_MIN-1);
2068  if (extraBits) {
2069  BIT_addBits(&blockStream, sequences[nbSeq-1].offset, extraBits);
2070  BIT_flushBits(&blockStream);
2071  }
2072  BIT_addBits(&blockStream, sequences[nbSeq-1].offset >> extraBits,
2073  ofBits - extraBits);
2074  } else {
2075  BIT_addBits(&blockStream, sequences[nbSeq-1].offset, ofCodeTable[nbSeq-1]);
2076  }
2077  BIT_flushBits(&blockStream);
2078 
2079  { size_t n;
2080  for (n=nbSeq-2 ; n<nbSeq ; n--) { /* intentional underflow */
2081  BYTE const llCode = llCodeTable[n];
2082  BYTE const ofCode = ofCodeTable[n];
2083  BYTE const mlCode = mlCodeTable[n];
2084  U32 const llBits = LL_bits[llCode];
2085  U32 const ofBits = ofCode;
2086  U32 const mlBits = ML_bits[mlCode];
2087  DEBUGLOG(6, "encoding: litlen:%2u - matchlen:%2u - offCode:%7u",
2088  sequences[n].litLength,
2089  sequences[n].matchLength + MINMATCH,
2090  sequences[n].offset);
2091  /* 32b*/ /* 64b*/
2092  /* (7)*/ /* (7)*/
2093  FSE_encodeSymbol(&blockStream, &stateOffsetBits, ofCode); /* 15 */ /* 15 */
2094  FSE_encodeSymbol(&blockStream, &stateMatchLength, mlCode); /* 24 */ /* 24 */
2095  if (MEM_32bits()) BIT_flushBits(&blockStream); /* (7)*/
2096  FSE_encodeSymbol(&blockStream, &stateLitLength, llCode); /* 16 */ /* 33 */
2097  if (MEM_32bits() || (ofBits+mlBits+llBits >= 64-7-(LLFSELog+MLFSELog+OffFSELog)))
2098  BIT_flushBits(&blockStream); /* (7)*/
2099  BIT_addBits(&blockStream, sequences[n].litLength, llBits);
2100  if (MEM_32bits() && ((llBits+mlBits)>24)) BIT_flushBits(&blockStream);
2101  BIT_addBits(&blockStream, sequences[n].matchLength, mlBits);
2102  if (MEM_32bits() || (ofBits+mlBits+llBits > 56)) BIT_flushBits(&blockStream);
2103  if (longOffsets) {
2104  int const extraBits = ofBits - MIN(ofBits, STREAM_ACCUMULATOR_MIN-1);
2105  if (extraBits) {
2106  BIT_addBits(&blockStream, sequences[n].offset, extraBits);
2107  BIT_flushBits(&blockStream); /* (7)*/
2108  }
2109  BIT_addBits(&blockStream, sequences[n].offset >> extraBits,
2110  ofBits - extraBits); /* 31 */
2111  } else {
2112  BIT_addBits(&blockStream, sequences[n].offset, ofBits); /* 31 */
2113  }
2114  BIT_flushBits(&blockStream); /* (7)*/
2115  } }
2116 
2117  DEBUGLOG(6, "ZSTD_encodeSequences: flushing ML state with %u bits", stateMatchLength.stateLog);
2118  FSE_flushCState(&blockStream, &stateMatchLength);
2119  DEBUGLOG(6, "ZSTD_encodeSequences: flushing Off state with %u bits", stateOffsetBits.stateLog);
2120  FSE_flushCState(&blockStream, &stateOffsetBits);
2121  DEBUGLOG(6, "ZSTD_encodeSequences: flushing LL state with %u bits", stateLitLength.stateLog);
2122  FSE_flushCState(&blockStream, &stateLitLength);
2123 
2124  { size_t const streamSize = BIT_closeCStream(&blockStream);
2125  if (streamSize==0) return ERROR(dstSize_tooSmall); /* not enough space */
2126  return streamSize;
2127  }
2128 }
2129 
2130 static size_t
2131 ZSTD_encodeSequences_default(
2132  void* dst, size_t dstCapacity,
2133  FSE_CTable const* CTable_MatchLength, BYTE const* mlCodeTable,
2134  FSE_CTable const* CTable_OffsetBits, BYTE const* ofCodeTable,
2135  FSE_CTable const* CTable_LitLength, BYTE const* llCodeTable,
2136  seqDef const* sequences, size_t nbSeq, int longOffsets)
2137 {
2138  return ZSTD_encodeSequences_body(dst, dstCapacity,
2139  CTable_MatchLength, mlCodeTable,
2140  CTable_OffsetBits, ofCodeTable,
2141  CTable_LitLength, llCodeTable,
2142  sequences, nbSeq, longOffsets);
2143 }
2144 
2145 
2146 #if DYNAMIC_BMI2
2147 
2148 static TARGET_ATTRIBUTE("bmi2") size_t
2149 ZSTD_encodeSequences_bmi2(
2150  void* dst, size_t dstCapacity,
2151  FSE_CTable const* CTable_MatchLength, BYTE const* mlCodeTable,
2152  FSE_CTable const* CTable_OffsetBits, BYTE const* ofCodeTable,
2153  FSE_CTable const* CTable_LitLength, BYTE const* llCodeTable,
2154  seqDef const* sequences, size_t nbSeq, int longOffsets)
2155 {
2156  return ZSTD_encodeSequences_body(dst, dstCapacity,
2157  CTable_MatchLength, mlCodeTable,
2158  CTable_OffsetBits, ofCodeTable,
2159  CTable_LitLength, llCodeTable,
2160  sequences, nbSeq, longOffsets);
2161 }
2162 
2163 #endif
2164 
2165 static size_t ZSTD_encodeSequences(
2166  void* dst, size_t dstCapacity,
2167  FSE_CTable const* CTable_MatchLength, BYTE const* mlCodeTable,
2168  FSE_CTable const* CTable_OffsetBits, BYTE const* ofCodeTable,
2169  FSE_CTable const* CTable_LitLength, BYTE const* llCodeTable,
2170  seqDef const* sequences, size_t nbSeq, int longOffsets, int bmi2)
2171 {
2172 #if DYNAMIC_BMI2
2173  if (bmi2) {
2174  return ZSTD_encodeSequences_bmi2(dst, dstCapacity,
2175  CTable_MatchLength, mlCodeTable,
2176  CTable_OffsetBits, ofCodeTable,
2177  CTable_LitLength, llCodeTable,
2178  sequences, nbSeq, longOffsets);
2179  }
2180 #endif
2181  (void)bmi2;
2182  return ZSTD_encodeSequences_default(dst, dstCapacity,
2183  CTable_MatchLength, mlCodeTable,
2184  CTable_OffsetBits, ofCodeTable,
2185  CTable_LitLength, llCodeTable,
2186  sequences, nbSeq, longOffsets);
2187 }
2188 
2189 MEM_STATIC size_t ZSTD_compressSequences_internal(seqStore_t* seqStorePtr,
2190  ZSTD_entropyCTables_t const* prevEntropy,
2191  ZSTD_entropyCTables_t* nextEntropy,
2192  ZSTD_CCtx_params const* cctxParams,
2193  void* dst, size_t dstCapacity, U32* workspace,
2194  const int bmi2)
2195 {
2196  const int longOffsets = cctxParams->cParams.windowLog > STREAM_ACCUMULATOR_MIN;
2197  ZSTD_strategy const strategy = cctxParams->cParams.strategy;
2198  U32 count[MaxSeq+1];
2199  FSE_CTable* CTable_LitLength = nextEntropy->fse.litlengthCTable;
2200  FSE_CTable* CTable_OffsetBits = nextEntropy->fse.offcodeCTable;
2201  FSE_CTable* CTable_MatchLength = nextEntropy->fse.matchlengthCTable;
2202  U32 LLtype, Offtype, MLtype; /* compressed, raw or rle */
2203  const seqDef* const sequences = seqStorePtr->sequencesStart;
2204  const BYTE* const ofCodeTable = seqStorePtr->ofCode;
2205  const BYTE* const llCodeTable = seqStorePtr->llCode;
2206  const BYTE* const mlCodeTable = seqStorePtr->mlCode;
2207  BYTE* const ostart = (BYTE*)dst;
2208  BYTE* const oend = ostart + dstCapacity;
2209  BYTE* op = ostart;
2210  size_t const nbSeq = seqStorePtr->sequences - seqStorePtr->sequencesStart;
2211  BYTE* seqHead;
2212  BYTE* lastNCount = NULL;
2213 
2214  ZSTD_STATIC_ASSERT(HUF_WORKSPACE_SIZE >= (1<<MAX(MLFSELog,LLFSELog)));
2215 
2216  /* Compress literals */
2217  { const BYTE* const literals = seqStorePtr->litStart;
2218  size_t const litSize = seqStorePtr->lit - literals;
2219  int const disableLiteralCompression = (cctxParams->cParams.strategy == ZSTD_fast) && (cctxParams->cParams.targetLength > 0);
2220  size_t const cSize = ZSTD_compressLiterals(
2221  &prevEntropy->huf, &nextEntropy->huf,
2222  cctxParams->cParams.strategy, disableLiteralCompression,
2223  op, dstCapacity,
2224  literals, litSize,
2225  workspace, bmi2);
2226  if (ZSTD_isError(cSize))
2227  return cSize;
2228  assert(cSize <= dstCapacity);
2229  op += cSize;
2230  }
2231 
2232  /* Sequences Header */
2233  if ((oend-op) < 3 /*max nbSeq Size*/ + 1 /*seqHead*/) return ERROR(dstSize_tooSmall);
2234  if (nbSeq < 0x7F)
2235  *op++ = (BYTE)nbSeq;
2236  else if (nbSeq < LONGNBSEQ)
2237  op[0] = (BYTE)((nbSeq>>8) + 0x80), op[1] = (BYTE)nbSeq, op+=2;
2238  else
2239  op[0]=0xFF, MEM_writeLE16(op+1, (U16)(nbSeq - LONGNBSEQ)), op+=3;
2240  if (nbSeq==0) {
2241  /* Copy the old tables over as if we repeated them */
2242  memcpy(&nextEntropy->fse, &prevEntropy->fse, sizeof(prevEntropy->fse));
2243  return op - ostart;
2244  }
2245 
2246  /* seqHead : flags for FSE encoding type */
2247  seqHead = op++;
2248 
2249  /* convert length/distances into codes */
2250  ZSTD_seqToCodes(seqStorePtr);
2251  /* build CTable for Literal Lengths */
2252  { U32 max = MaxLL;
2253  size_t const mostFrequent = HIST_countFast_wksp(count, &max, llCodeTable, nbSeq, workspace); /* can't fail */
2254  DEBUGLOG(5, "Building LL table");
2255  nextEntropy->fse.litlength_repeatMode = prevEntropy->fse.litlength_repeatMode;
2256  LLtype = ZSTD_selectEncodingType(&nextEntropy->fse.litlength_repeatMode, count, max, mostFrequent, nbSeq, LLFSELog, prevEntropy->fse.litlengthCTable, LL_defaultNorm, LL_defaultNormLog, ZSTD_defaultAllowed, strategy);
2257  assert(set_basic < set_compressed && set_rle < set_compressed);
2258  assert(!(LLtype < set_compressed && nextEntropy->fse.litlength_repeatMode != FSE_repeat_none)); /* We don't copy tables */
2259  { size_t const countSize = ZSTD_buildCTable(op, oend - op, CTable_LitLength, LLFSELog, (symbolEncodingType_e)LLtype,
2260  count, max, llCodeTable, nbSeq, LL_defaultNorm, LL_defaultNormLog, MaxLL,
2261  prevEntropy->fse.litlengthCTable, sizeof(prevEntropy->fse.litlengthCTable),
2262  workspace, HUF_WORKSPACE_SIZE);
2263  if (ZSTD_isError(countSize)) return countSize;
2264  if (LLtype == set_compressed)
2265  lastNCount = op;
2266  op += countSize;
2267  } }
2268  /* build CTable for Offsets */
2269  { U32 max = MaxOff;
2270  size_t const mostFrequent = HIST_countFast_wksp(count, &max, ofCodeTable, nbSeq, workspace); /* can't fail */
2271  /* We can only use the basic table if max <= DefaultMaxOff, otherwise the offsets are too large */
2272  ZSTD_defaultPolicy_e const defaultPolicy = (max <= DefaultMaxOff) ? ZSTD_defaultAllowed : ZSTD_defaultDisallowed;
2273  DEBUGLOG(5, "Building OF table");
2274  nextEntropy->fse.offcode_repeatMode = prevEntropy->fse.offcode_repeatMode;
2275  Offtype = ZSTD_selectEncodingType(&nextEntropy->fse.offcode_repeatMode, count, max, mostFrequent, nbSeq, OffFSELog, prevEntropy->fse.offcodeCTable, OF_defaultNorm, OF_defaultNormLog, defaultPolicy, strategy);
2276  assert(!(Offtype < set_compressed && nextEntropy->fse.offcode_repeatMode != FSE_repeat_none)); /* We don't copy tables */
2277  { size_t const countSize = ZSTD_buildCTable(op, oend - op, CTable_OffsetBits, OffFSELog, (symbolEncodingType_e)Offtype,
2278  count, max, ofCodeTable, nbSeq, OF_defaultNorm, OF_defaultNormLog, DefaultMaxOff,
2279  prevEntropy->fse.offcodeCTable, sizeof(prevEntropy->fse.offcodeCTable),
2280  workspace, HUF_WORKSPACE_SIZE);
2281  if (ZSTD_isError(countSize)) return countSize;
2282  if (Offtype == set_compressed)
2283  lastNCount = op;
2284  op += countSize;
2285  } }
2286  /* build CTable for MatchLengths */
2287  { U32 max = MaxML;
2288  size_t const mostFrequent = HIST_countFast_wksp(count, &max, mlCodeTable, nbSeq, workspace); /* can't fail */
2289  DEBUGLOG(5, "Building ML table");
2290  nextEntropy->fse.matchlength_repeatMode = prevEntropy->fse.matchlength_repeatMode;
2291  MLtype = ZSTD_selectEncodingType(&nextEntropy->fse.matchlength_repeatMode, count, max, mostFrequent, nbSeq, MLFSELog, prevEntropy->fse.matchlengthCTable, ML_defaultNorm, ML_defaultNormLog, ZSTD_defaultAllowed, strategy);
2292  assert(!(MLtype < set_compressed && nextEntropy->fse.matchlength_repeatMode != FSE_repeat_none)); /* We don't copy tables */
2293  { size_t const countSize = ZSTD_buildCTable(op, oend - op, CTable_MatchLength, MLFSELog, (symbolEncodingType_e)MLtype,
2294  count, max, mlCodeTable, nbSeq, ML_defaultNorm, ML_defaultNormLog, MaxML,
2295  prevEntropy->fse.matchlengthCTable, sizeof(prevEntropy->fse.matchlengthCTable),
2296  workspace, HUF_WORKSPACE_SIZE);
2297  if (ZSTD_isError(countSize)) return countSize;
2298  if (MLtype == set_compressed)
2299  lastNCount = op;
2300  op += countSize;
2301  } }
2302 
2303  *seqHead = (BYTE)((LLtype<<6) + (Offtype<<4) + (MLtype<<2));
2304 
2305  { size_t const bitstreamSize = ZSTD_encodeSequences(
2306  op, oend - op,
2307  CTable_MatchLength, mlCodeTable,
2308  CTable_OffsetBits, ofCodeTable,
2309  CTable_LitLength, llCodeTable,
2310  sequences, nbSeq,
2311  longOffsets, bmi2);
2312  if (ZSTD_isError(bitstreamSize)) return bitstreamSize;
2313  op += bitstreamSize;
2314  /* zstd versions <= 1.3.4 mistakenly report corruption when
2315  * FSE_readNCount() recieves a buffer < 4 bytes.
2316  * Fixed by https://github.com/facebook/zstd/pull/1146.
2317  * This can happen when the last set_compressed table present is 2
2318  * bytes and the bitstream is only one byte.
2319  * In this exceedingly rare case, we will simply emit an uncompressed
2320  * block, since it isn't worth optimizing.
2321  */
2322  if (lastNCount && (op - lastNCount) < 4) {
2323  /* NCountSize >= 2 && bitstreamSize > 0 ==> lastCountSize == 3 */
2324  assert(op - lastNCount == 3);
2325  DEBUGLOG(5, "Avoiding bug in zstd decoder in versions <= 1.3.4 by "
2326  "emitting an uncompressed block.");
2327  return 0;
2328  }
2329  }
2330 
2331  return op - ostart;
2332 }
2333 
2334 MEM_STATIC size_t ZSTD_compressSequences(seqStore_t* seqStorePtr,
2335  const ZSTD_entropyCTables_t* prevEntropy,
2336  ZSTD_entropyCTables_t* nextEntropy,
2337  const ZSTD_CCtx_params* cctxParams,
2338  void* dst, size_t dstCapacity,
2339  size_t srcSize, U32* workspace, int bmi2)
2340 {
2341  size_t const cSize = ZSTD_compressSequences_internal(
2342  seqStorePtr, prevEntropy, nextEntropy, cctxParams, dst, dstCapacity,
2343  workspace, bmi2);
2344  if (cSize == 0) return 0;
2345  /* When srcSize <= dstCapacity, there is enough space to write a raw uncompressed block.
2346  * Since we ran out of space, block must be not compressible, so fall back to raw uncompressed block.
2347  */
2348  if ((cSize == ERROR(dstSize_tooSmall)) & (srcSize <= dstCapacity))
2349  return 0; /* block not compressed */
2350  if (ZSTD_isError(cSize)) return cSize;
2351 
2352  /* Check compressibility */
2353  { size_t const maxCSize = srcSize - ZSTD_minGain(srcSize, cctxParams->cParams.strategy);
2354  if (cSize >= maxCSize) return 0; /* block not compressed */
2355  }
2356 
2357  return cSize;
2358 }
2359 
2360 /* ZSTD_selectBlockCompressor() :
2361  * Not static, but internal use only (used by long distance matcher)
2362  * assumption : strat is a valid strategy */
2363 ZSTD_blockCompressor ZSTD_selectBlockCompressor(ZSTD_strategy strat, ZSTD_dictMode_e dictMode)
2364 {
2365  static const ZSTD_blockCompressor blockCompressor[3][(unsigned)ZSTD_btultra+1] = {
2366  { ZSTD_compressBlock_fast /* default for 0 */,
2367  ZSTD_compressBlock_fast,
2368  ZSTD_compressBlock_doubleFast,
2369  ZSTD_compressBlock_greedy,
2370  ZSTD_compressBlock_lazy,
2371  ZSTD_compressBlock_lazy2,
2372  ZSTD_compressBlock_btlazy2,
2373  ZSTD_compressBlock_btopt,
2374  ZSTD_compressBlock_btultra },
2375  { ZSTD_compressBlock_fast_extDict /* default for 0 */,
2376  ZSTD_compressBlock_fast_extDict,
2377  ZSTD_compressBlock_doubleFast_extDict,
2378  ZSTD_compressBlock_greedy_extDict,
2379  ZSTD_compressBlock_lazy_extDict,
2380  ZSTD_compressBlock_lazy2_extDict,
2381  ZSTD_compressBlock_btlazy2_extDict,
2382  ZSTD_compressBlock_btopt_extDict,
2383  ZSTD_compressBlock_btultra_extDict },
2384  { ZSTD_compressBlock_fast_dictMatchState /* default for 0 */,
2385  ZSTD_compressBlock_fast_dictMatchState,
2386  ZSTD_compressBlock_doubleFast_dictMatchState,
2387  ZSTD_compressBlock_greedy_dictMatchState,
2388  ZSTD_compressBlock_lazy_dictMatchState,
2389  ZSTD_compressBlock_lazy2_dictMatchState,
2390  ZSTD_compressBlock_btlazy2_dictMatchState,
2391  ZSTD_compressBlock_btopt_dictMatchState,
2392  ZSTD_compressBlock_btultra_dictMatchState }
2393  };
2394  ZSTD_blockCompressor selectedCompressor;
2395  ZSTD_STATIC_ASSERT((unsigned)ZSTD_fast == 1);
2396 
2397  assert((U32)strat >= (U32)ZSTD_fast);
2398  assert((U32)strat <= (U32)ZSTD_btultra);
2399  selectedCompressor = blockCompressor[(int)dictMode][(U32)strat];
2400  assert(selectedCompressor != NULL);
2401  return selectedCompressor;
2402 }
2403 
2404 static void ZSTD_storeLastLiterals(seqStore_t* seqStorePtr,
2405  const BYTE* anchor, size_t lastLLSize)
2406 {
2407  memcpy(seqStorePtr->lit, anchor, lastLLSize);
2408  seqStorePtr->lit += lastLLSize;
2409 }
2410 
2411 void ZSTD_resetSeqStore(seqStore_t* ssPtr)
2412 {
2413  ssPtr->lit = ssPtr->litStart;
2414  ssPtr->sequences = ssPtr->sequencesStart;
2415  ssPtr->longLengthID = 0;
2416 }
2417 
2418 static size_t ZSTD_compressBlock_internal(ZSTD_CCtx* zc,
2419  void* dst, size_t dstCapacity,
2420  const void* src, size_t srcSize)
2421 {
2422  ZSTD_matchState_t* const ms = &zc->blockState.matchState;
2423  size_t cSize;
2424  DEBUGLOG(5, "ZSTD_compressBlock_internal (dstCapacity=%zu, dictLimit=%u, nextToUpdate=%u)",
2425  dstCapacity, ms->window.dictLimit, ms->nextToUpdate);
2426  assert(srcSize <= ZSTD_BLOCKSIZE_MAX);
2427 
2428  /* Assert that we have correctly flushed the ctx params into the ms's copy */
2429  ZSTD_assertEqualCParams(zc->appliedParams.cParams, ms->cParams);
2430 
2431  if (srcSize < MIN_CBLOCK_SIZE+ZSTD_blockHeaderSize+1) {
2432  ZSTD_ldm_skipSequences(&zc->externSeqStore, srcSize, zc->appliedParams.cParams.searchLength);
2433  cSize = 0;
2434  goto out; /* don't even attempt compression below a certain srcSize */
2435  }
2436  ZSTD_resetSeqStore(&(zc->seqStore));
2437  ms->opt.symbolCosts = &zc->blockState.prevCBlock->entropy; /* required for optimal parser to read stats from dictionary */
2438 
2439  /* a gap between an attached dict and the current window is not safe,
2440  * they must remain adjacent, and when that stops being the case, the dict
2441  * must be unset */
2442  assert(ms->dictMatchState == NULL || ms->loadedDictEnd == ms->window.dictLimit);
2443 
2444  /* limited update after a very long match */
2445  { const BYTE* const base = ms->window.base;
2446  const BYTE* const istart = (const BYTE*)src;
2447  const U32 current = (U32)(istart-base);
2448  if (sizeof(ptrdiff_t)==8) assert(istart - base < (ptrdiff_t)(U32)(-1)); /* ensure no overflow */
2449  if (current > ms->nextToUpdate + 384)
2450  ms->nextToUpdate = current - MIN(192, (U32)(current - ms->nextToUpdate - 384));
2451  }
2452 
2453  /* select and store sequences */
2454  { ZSTD_dictMode_e const dictMode = ZSTD_matchState_dictMode(ms);
2455  size_t lastLLSize;
2456  { int i;
2457  for (i = 0; i < ZSTD_REP_NUM; ++i)
2458  zc->blockState.nextCBlock->rep[i] = zc->blockState.prevCBlock->rep[i];
2459  }
2460  if (zc->externSeqStore.pos < zc->externSeqStore.size) {
2461  assert(!zc->appliedParams.ldmParams.enableLdm);
2462  /* Updates ldmSeqStore.pos */
2463  lastLLSize =
2464  ZSTD_ldm_blockCompress(&zc->externSeqStore,
2465  ms, &zc->seqStore,
2466  zc->blockState.nextCBlock->rep,
2467  src, srcSize);
2468  assert(zc->externSeqStore.pos <= zc->externSeqStore.size);
2469  } else if (zc->appliedParams.ldmParams.enableLdm) {
2470  rawSeqStore_t ldmSeqStore = {NULL, 0, 0, 0};
2471 
2472  ldmSeqStore.seq = zc->ldmSequences;
2473  ldmSeqStore.capacity = zc->maxNbLdmSequences;
2474  /* Updates ldmSeqStore.size */
2475  CHECK_F(ZSTD_ldm_generateSequences(&zc->ldmState, &ldmSeqStore,
2476  &zc->appliedParams.ldmParams,
2477  src, srcSize));
2478  /* Updates ldmSeqStore.pos */
2479  lastLLSize =
2480  ZSTD_ldm_blockCompress(&ldmSeqStore,
2481  ms, &zc->seqStore,
2482  zc->blockState.nextCBlock->rep,
2483  src, srcSize);
2484  assert(ldmSeqStore.pos == ldmSeqStore.size);
2485  } else { /* not long range mode */
2486  ZSTD_blockCompressor const blockCompressor = ZSTD_selectBlockCompressor(zc->appliedParams.cParams.strategy, dictMode);
2487  lastLLSize = blockCompressor(ms, &zc->seqStore, zc->blockState.nextCBlock->rep, src, srcSize);
2488  }
2489  { const BYTE* const lastLiterals = (const BYTE*)src + srcSize - lastLLSize;
2490  ZSTD_storeLastLiterals(&zc->seqStore, lastLiterals, lastLLSize);
2491  } }
2492 
2493  /* encode sequences and literals */
2494  cSize = ZSTD_compressSequences(&zc->seqStore,
2495  &zc->blockState.prevCBlock->entropy, &zc->blockState.nextCBlock->entropy,
2496  &zc->appliedParams,
2497  dst, dstCapacity,
2498  srcSize, zc->entropyWorkspace, zc->bmi2);
2499 
2500 out:
2501  if (!ZSTD_isError(cSize) && cSize != 0) {
2502  /* confirm repcodes and entropy tables when emitting a compressed block */
2503  ZSTD_compressedBlockState_t* const tmp = zc->blockState.prevCBlock;
2504  zc->blockState.prevCBlock = zc->blockState.nextCBlock;
2505  zc->blockState.nextCBlock = tmp;
2506  }
2507  /* We check that dictionaries have offset codes available for the first
2508  * block. After the first block, the offcode table might not have large
2509  * enough codes to represent the offsets in the data.
2510  */
2511  if (zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid)
2512  zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check;
2513 
2514  return cSize;
2515 }
2516 
2517 
2525 static size_t ZSTD_compress_frameChunk (ZSTD_CCtx* cctx,
2526  void* dst, size_t dstCapacity,
2527  const void* src, size_t srcSize,
2528  U32 lastFrameChunk)
2529 {
2530  size_t blockSize = cctx->blockSize;
2531  size_t remaining = srcSize;
2532  const BYTE* ip = (const BYTE*)src;
2533  BYTE* const ostart = (BYTE*)dst;
2534  BYTE* op = ostart;
2535  U32 const maxDist = (U32)1 << cctx->appliedParams.cParams.windowLog;
2536  assert(cctx->appliedParams.cParams.windowLog <= 31);
2537 
2538  DEBUGLOG(5, "ZSTD_compress_frameChunk (blockSize=%u)", (U32)blockSize);
2539  if (cctx->appliedParams.fParams.checksumFlag && srcSize)
2540  XXH64_update(&cctx->xxhState, src, srcSize);
2541 
2542  while (remaining) {
2543  ZSTD_matchState_t* const ms = &cctx->blockState.matchState;
2544  U32 const lastBlock = lastFrameChunk & (blockSize >= remaining);
2545 
2546  if (dstCapacity < ZSTD_blockHeaderSize + MIN_CBLOCK_SIZE)
2547  return ERROR(dstSize_tooSmall); /* not enough space to store compressed block */
2548  if (remaining < blockSize) blockSize = remaining;
2549 
2550  if (ZSTD_window_needOverflowCorrection(ms->window, ip + blockSize)) {
2551  U32 const cycleLog = ZSTD_cycleLog(cctx->appliedParams.cParams.chainLog, cctx->appliedParams.cParams.strategy);
2552  U32 const correction = ZSTD_window_correctOverflow(&ms->window, cycleLog, maxDist, ip);
2553  ZSTD_STATIC_ASSERT(ZSTD_CHAINLOG_MAX <= 30);
2554  ZSTD_STATIC_ASSERT(ZSTD_WINDOWLOG_MAX_32 <= 30);
2555  ZSTD_STATIC_ASSERT(ZSTD_WINDOWLOG_MAX <= 31);
2556  ZSTD_reduceIndex(cctx, correction);
2557  if (ms->nextToUpdate < correction) ms->nextToUpdate = 0;
2558  else ms->nextToUpdate -= correction;
2559  ms->loadedDictEnd = 0;
2560  ms->dictMatchState = NULL;
2561  }
2562  ZSTD_window_enforceMaxDist(&ms->window, ip + blockSize, maxDist, &ms->loadedDictEnd, &ms->dictMatchState);
2563  if (ms->nextToUpdate < ms->window.lowLimit) ms->nextToUpdate = ms->window.lowLimit;
2564 
2565  { size_t cSize = ZSTD_compressBlock_internal(cctx,
2566  op+ZSTD_blockHeaderSize, dstCapacity-ZSTD_blockHeaderSize,
2567  ip, blockSize);
2568  if (ZSTD_isError(cSize)) return cSize;
2569 
2570  if (cSize == 0) { /* block is not compressible */
2571  cSize = ZSTD_noCompressBlock(op, dstCapacity, ip, blockSize, lastBlock);
2572  if (ZSTD_isError(cSize)) return cSize;
2573  } else {
2574  U32 const cBlockHeader24 = lastBlock + (((U32)bt_compressed)<<1) + (U32)(cSize << 3);
2575  MEM_writeLE24(op, cBlockHeader24);
2576  cSize += ZSTD_blockHeaderSize;
2577  }
2578 
2579  ip += blockSize;
2580  assert(remaining >= blockSize);
2581  remaining -= blockSize;
2582  op += cSize;
2583  assert(dstCapacity >= cSize);
2584  dstCapacity -= cSize;
2585  DEBUGLOG(5, "ZSTD_compress_frameChunk: adding a block of size %u",
2586  (U32)cSize);
2587  } }
2588 
2589  if (lastFrameChunk && (op>ostart)) cctx->stage = ZSTDcs_ending;
2590  return op-ostart;
2591 }
2592 
2593 
2594 static size_t ZSTD_writeFrameHeader(void* dst, size_t dstCapacity,
2595  ZSTD_CCtx_params params, U64 pledgedSrcSize, U32 dictID)
2596 { BYTE* const op = (BYTE*)dst;
2597  U32 const dictIDSizeCodeLength = (dictID>0) + (dictID>=256) + (dictID>=65536); /* 0-3 */
2598  U32 const dictIDSizeCode = params.fParams.noDictIDFlag ? 0 : dictIDSizeCodeLength; /* 0-3 */
2599  U32 const checksumFlag = params.fParams.checksumFlag>0;
2600  U32 const windowSize = (U32)1 << params.cParams.windowLog;
2601  U32 const singleSegment = params.fParams.contentSizeFlag && (windowSize >= pledgedSrcSize);
2602  BYTE const windowLogByte = (BYTE)((params.cParams.windowLog - ZSTD_WINDOWLOG_ABSOLUTEMIN) << 3);
2603  U32 const fcsCode = params.fParams.contentSizeFlag ?
2604  (pledgedSrcSize>=256) + (pledgedSrcSize>=65536+256) + (pledgedSrcSize>=0xFFFFFFFFU) : 0; /* 0-3 */
2605  BYTE const frameHeaderDecriptionByte = (BYTE)(dictIDSizeCode + (checksumFlag<<2) + (singleSegment<<5) + (fcsCode<<6) );
2606  size_t pos=0;
2607 
2608  assert(!(params.fParams.contentSizeFlag && pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN));
2609  if (dstCapacity < ZSTD_frameHeaderSize_max) return ERROR(dstSize_tooSmall);
2610  DEBUGLOG(4, "ZSTD_writeFrameHeader : dictIDFlag : %u ; dictID : %u ; dictIDSizeCode : %u",
2611  !params.fParams.noDictIDFlag, dictID, dictIDSizeCode);
2612 
2613  if (params.format == ZSTD_f_zstd1) {
2614  MEM_writeLE32(dst, ZSTD_MAGICNUMBER);
2615  pos = 4;
2616  }
2617  op[pos++] = frameHeaderDecriptionByte;
2618  if (!singleSegment) op[pos++] = windowLogByte;
2619  switch(dictIDSizeCode)
2620  {
2621  default: assert(0); /* impossible */
2622  case 0 : break;
2623  case 1 : op[pos] = (BYTE)(dictID); pos++; break;
2624  case 2 : MEM_writeLE16(op+pos, (U16)dictID); pos+=2; break;
2625  case 3 : MEM_writeLE32(op+pos, dictID); pos+=4; break;
2626  }
2627  switch(fcsCode)
2628  {
2629  default: assert(0); /* impossible */
2630  case 0 : if (singleSegment) op[pos++] = (BYTE)(pledgedSrcSize); break;
2631  case 1 : MEM_writeLE16(op+pos, (U16)(pledgedSrcSize-256)); pos+=2; break;
2632  case 2 : MEM_writeLE32(op+pos, (U32)(pledgedSrcSize)); pos+=4; break;
2633  case 3 : MEM_writeLE64(op+pos, (U64)(pledgedSrcSize)); pos+=8; break;
2634  }
2635  return pos;
2636 }
2637 
2638 /* ZSTD_writeLastEmptyBlock() :
2639  * output an empty Block with end-of-frame mark to complete a frame
2640  * @return : size of data written into `dst` (== ZSTD_blockHeaderSize (defined in zstd_internal.h))
2641  * or an error code if `dstCapcity` is too small (<ZSTD_blockHeaderSize)
2642  */
2643 size_t ZSTD_writeLastEmptyBlock(void* dst, size_t dstCapacity)
2644 {
2645  if (dstCapacity < ZSTD_blockHeaderSize) return ERROR(dstSize_tooSmall);
2646  { U32 const cBlockHeader24 = 1 /*lastBlock*/ + (((U32)bt_raw)<<1); /* 0 size */
2647  MEM_writeLE24(dst, cBlockHeader24);
2648  return ZSTD_blockHeaderSize;
2649  }
2650 }
2651 
2652 size_t ZSTD_referenceExternalSequences(ZSTD_CCtx* cctx, rawSeq* seq, size_t nbSeq)
2653 {
2654  if (cctx->stage != ZSTDcs_init)
2655  return ERROR(stage_wrong);
2656  if (cctx->appliedParams.ldmParams.enableLdm)
2657  return ERROR(parameter_unsupported);
2658  cctx->externSeqStore.seq = seq;
2659  cctx->externSeqStore.size = nbSeq;
2660  cctx->externSeqStore.capacity = nbSeq;
2661  cctx->externSeqStore.pos = 0;
2662  return 0;
2663 }
2664 
2665 
2666 static size_t ZSTD_compressContinue_internal (ZSTD_CCtx* cctx,
2667  void* dst, size_t dstCapacity,
2668  const void* src, size_t srcSize,
2669  U32 frame, U32 lastFrameChunk)
2670 {
2671  ZSTD_matchState_t* const ms = &cctx->blockState.matchState;
2672  size_t fhSize = 0;
2673 
2674  DEBUGLOG(5, "ZSTD_compressContinue_internal, stage: %u, srcSize: %u",
2675  cctx->stage, (U32)srcSize);
2676  if (cctx->stage==ZSTDcs_created) return ERROR(stage_wrong); /* missing init (ZSTD_compressBegin) */
2677 
2678  if (frame && (cctx->stage==ZSTDcs_init)) {
2679  fhSize = ZSTD_writeFrameHeader(dst, dstCapacity, cctx->appliedParams,
2680  cctx->pledgedSrcSizePlusOne-1, cctx->dictID);
2681  if (ZSTD_isError(fhSize)) return fhSize;
2682  dstCapacity -= fhSize;
2683  dst = (char*)dst + fhSize;
2684  cctx->stage = ZSTDcs_ongoing;
2685  }
2686 
2687  if (!srcSize) return fhSize; /* do not generate an empty block if no input */
2688 
2689  if (!ZSTD_window_update(&ms->window, src, srcSize)) {
2690  ms->nextToUpdate = ms->window.dictLimit;
2691  }
2692  if (cctx->appliedParams.ldmParams.enableLdm) {
2693  ZSTD_window_update(&cctx->ldmState.window, src, srcSize);
2694  }
2695 
2696  if (!frame) {
2697  /* overflow check and correction for block mode */
2698  if (ZSTD_window_needOverflowCorrection(ms->window, (const char*)src + srcSize)) {
2699  U32 const cycleLog = ZSTD_cycleLog(cctx->appliedParams.cParams.chainLog, cctx->appliedParams.cParams.strategy);
2700  U32 const correction = ZSTD_window_correctOverflow(&ms->window, cycleLog, 1 << cctx->appliedParams.cParams.windowLog, src);
2701  ZSTD_STATIC_ASSERT(ZSTD_CHAINLOG_MAX <= 30);
2702  ZSTD_STATIC_ASSERT(ZSTD_WINDOWLOG_MAX_32 <= 30);
2703  ZSTD_STATIC_ASSERT(ZSTD_WINDOWLOG_MAX <= 31);
2704  ZSTD_reduceIndex(cctx, correction);
2705  if (ms->nextToUpdate < correction) ms->nextToUpdate = 0;
2706  else ms->nextToUpdate -= correction;
2707  ms->loadedDictEnd = 0;
2708  ms->dictMatchState = NULL;
2709  }
2710  }
2711 
2712  DEBUGLOG(5, "ZSTD_compressContinue_internal (blockSize=%u)", (U32)cctx->blockSize);
2713  { size_t const cSize = frame ?
2714  ZSTD_compress_frameChunk (cctx, dst, dstCapacity, src, srcSize, lastFrameChunk) :
2715  ZSTD_compressBlock_internal (cctx, dst, dstCapacity, src, srcSize);
2716  if (ZSTD_isError(cSize)) return cSize;
2717  cctx->consumedSrcSize += srcSize;
2718  cctx->producedCSize += (cSize + fhSize);
2719  assert(!(cctx->appliedParams.fParams.contentSizeFlag && cctx->pledgedSrcSizePlusOne == 0));
2720  if (cctx->pledgedSrcSizePlusOne != 0) { /* control src size */
2721  ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_UNKNOWN == (unsigned long long)-1);
2722  if (cctx->consumedSrcSize+1 > cctx->pledgedSrcSizePlusOne) {
2723  DEBUGLOG(4, "error : pledgedSrcSize = %u, while realSrcSize >= %u",
2724  (U32)cctx->pledgedSrcSizePlusOne-1, (U32)cctx->consumedSrcSize);
2725  return ERROR(srcSize_wrong);
2726  }
2727  }
2728  return cSize + fhSize;
2729  }
2730 }
2731 
2732 size_t ZSTD_compressContinue (ZSTD_CCtx* cctx,
2733  void* dst, size_t dstCapacity,
2734  const void* src, size_t srcSize)
2735 {
2736  DEBUGLOG(5, "ZSTD_compressContinue (srcSize=%u)", (U32)srcSize);
2737  return ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 1 /* frame mode */, 0 /* last chunk */);
2738 }
2739 
2740 
2741 size_t ZSTD_getBlockSize(const ZSTD_CCtx* cctx)
2742 {
2743  ZSTD_compressionParameters const cParams = cctx->appliedParams.cParams;
2744  assert(!ZSTD_checkCParams(cParams));
2745  return MIN (ZSTD_BLOCKSIZE_MAX, (U32)1 << cParams.windowLog);
2746 }
2747 
2748 size_t ZSTD_compressBlock(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize)
2749 {
2750  size_t const blockSizeMax = ZSTD_getBlockSize(cctx);
2751  if (srcSize > blockSizeMax) return ERROR(srcSize_wrong);
2752 
2753  return ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 0 /* frame mode */, 0 /* last chunk */);
2754 }
2755 
2759 static size_t ZSTD_loadDictionaryContent(ZSTD_matchState_t* ms,
2760  ZSTD_CCtx_params const* params,
2761  const void* src, size_t srcSize,
2762  ZSTD_dictTableLoadMethod_e dtlm)
2763 {
2764  const BYTE* const ip = (const BYTE*) src;
2765  const BYTE* const iend = ip + srcSize;
2766 
2767  ZSTD_window_update(&ms->window, src, srcSize);
2768  ms->loadedDictEnd = params->forceWindow ? 0 : (U32)(iend - ms->window.base);
2769 
2770  /* Assert that we the ms params match the params we're being given */
2771  ZSTD_assertEqualCParams(params->cParams, ms->cParams);
2772 
2773  if (srcSize <= HASH_READ_SIZE) return 0;
2774 
2775  switch(params->cParams.strategy)
2776  {
2777  case ZSTD_fast:
2778  ZSTD_fillHashTable(ms, iend, dtlm);
2779  break;
2780  case ZSTD_dfast:
2781  ZSTD_fillDoubleHashTable(ms, iend, dtlm);
2782  break;
2783 
2784  case ZSTD_greedy:
2785  case ZSTD_lazy:
2786  case ZSTD_lazy2:
2787  if (srcSize >= HASH_READ_SIZE)
2788  ZSTD_insertAndFindFirstIndex(ms, iend-HASH_READ_SIZE);
2789  break;
2790 
2791  case ZSTD_btlazy2: /* we want the dictionary table fully sorted */
2792  case ZSTD_btopt:
2793  case ZSTD_btultra:
2794  if (srcSize >= HASH_READ_SIZE)
2795  ZSTD_updateTree(ms, iend-HASH_READ_SIZE, iend);
2796  break;
2797 
2798  default:
2799  assert(0); /* not possible : not a valid strategy id */
2800  }
2801 
2802  ms->nextToUpdate = (U32)(iend - ms->window.base);
2803  return 0;
2804 }
2805 
2806 
2807 /* Dictionaries that assign zero probability to symbols that show up causes problems
2808  when FSE encoding. Refuse dictionaries that assign zero probability to symbols
2809  that we may encounter during compression.
2810  NOTE: This behavior is not standard and could be improved in the future. */
2811 static size_t ZSTD_checkDictNCount(short* normalizedCounter, unsigned dictMaxSymbolValue, unsigned maxSymbolValue) {
2812  U32 s;
2813  if (dictMaxSymbolValue < maxSymbolValue) return ERROR(dictionary_corrupted);
2814  for (s = 0; s <= maxSymbolValue; ++s) {
2815  if (normalizedCounter[s] == 0) return ERROR(dictionary_corrupted);
2816  }
2817  return 0;
2818 }
2819 
2820 
2821 /* Dictionary format :
2822  * See :
2823  * https://github.com/facebook/zstd/blob/master/doc/zstd_compression_format.md#dictionary-format
2824  */
2830 static size_t ZSTD_loadZstdDictionary(ZSTD_compressedBlockState_t* bs,
2831  ZSTD_matchState_t* ms,
2832  ZSTD_CCtx_params const* params,
2833  const void* dict, size_t dictSize,
2834  ZSTD_dictTableLoadMethod_e dtlm,
2835  void* workspace)
2836 {
2837  const BYTE* dictPtr = (const BYTE*)dict;
2838  const BYTE* const dictEnd = dictPtr + dictSize;
2839  short offcodeNCount[MaxOff+1];
2840  unsigned offcodeMaxValue = MaxOff;
2841  size_t dictID;
2842 
2843  ZSTD_STATIC_ASSERT(HUF_WORKSPACE_SIZE >= (1<<MAX(MLFSELog,LLFSELog)));
2844  assert(dictSize > 8);
2845  assert(MEM_readLE32(dictPtr) == ZSTD_MAGIC_DICTIONARY);
2846 
2847  dictPtr += 4; /* skip magic number */
2848  dictID = params->fParams.noDictIDFlag ? 0 : MEM_readLE32(dictPtr);
2849  dictPtr += 4;
2850 
2851  { unsigned maxSymbolValue = 255;
2852  size_t const hufHeaderSize = HUF_readCTable((HUF_CElt*)bs->entropy.huf.CTable, &maxSymbolValue, dictPtr, dictEnd-dictPtr);
2853  if (HUF_isError(hufHeaderSize)) return ERROR(dictionary_corrupted);
2854  if (maxSymbolValue < 255) return ERROR(dictionary_corrupted);
2855  dictPtr += hufHeaderSize;
2856  }
2857 
2858  { unsigned offcodeLog;
2859  size_t const offcodeHeaderSize = FSE_readNCount(offcodeNCount, &offcodeMaxValue, &offcodeLog, dictPtr, dictEnd-dictPtr);
2860  if (FSE_isError(offcodeHeaderSize)) return ERROR(dictionary_corrupted);
2861  if (offcodeLog > OffFSELog) return ERROR(dictionary_corrupted);
2862  /* Defer checking offcodeMaxValue because we need to know the size of the dictionary content */
2863  /* fill all offset symbols to avoid garbage at end of table */
2864  CHECK_E( FSE_buildCTable_wksp(bs->entropy.fse.offcodeCTable, offcodeNCount, MaxOff, offcodeLog, workspace, HUF_WORKSPACE_SIZE),
2865  dictionary_corrupted);
2866  dictPtr += offcodeHeaderSize;
2867  }
2868 
2869  { short matchlengthNCount[MaxML+1];
2870  unsigned matchlengthMaxValue = MaxML, matchlengthLog;
2871  size_t const matchlengthHeaderSize = FSE_readNCount(matchlengthNCount, &matchlengthMaxValue, &matchlengthLog, dictPtr, dictEnd-dictPtr);
2872  if (FSE_isError(matchlengthHeaderSize)) return ERROR(dictionary_corrupted);
2873  if (matchlengthLog > MLFSELog) return ERROR(dictionary_corrupted);
2874  /* Every match length code must have non-zero probability */
2875  CHECK_F( ZSTD_checkDictNCount(matchlengthNCount, matchlengthMaxValue, MaxML));
2876  CHECK_E( FSE_buildCTable_wksp(bs->entropy.fse.matchlengthCTable, matchlengthNCount, matchlengthMaxValue, matchlengthLog, workspace, HUF_WORKSPACE_SIZE),
2877  dictionary_corrupted);
2878  dictPtr += matchlengthHeaderSize;
2879  }
2880 
2881  { short litlengthNCount[MaxLL+1];
2882  unsigned litlengthMaxValue = MaxLL, litlengthLog;
2883  size_t const litlengthHeaderSize = FSE_readNCount(litlengthNCount, &litlengthMaxValue, &litlengthLog, dictPtr, dictEnd-dictPtr);
2884  if (FSE_isError(litlengthHeaderSize)) return ERROR(dictionary_corrupted);
2885  if (litlengthLog > LLFSELog) return ERROR(dictionary_corrupted);
2886  /* Every literal length code must have non-zero probability */
2887  CHECK_F( ZSTD_checkDictNCount(litlengthNCount, litlengthMaxValue, MaxLL));
2888  CHECK_E( FSE_buildCTable_wksp(bs->entropy.fse.litlengthCTable, litlengthNCount, litlengthMaxValue, litlengthLog, workspace, HUF_WORKSPACE_SIZE),
2889  dictionary_corrupted);
2890  dictPtr += litlengthHeaderSize;
2891  }
2892 
2893  if (dictPtr+12 > dictEnd) return ERROR(dictionary_corrupted);
2894  bs->rep[0] = MEM_readLE32(dictPtr+0);
2895  bs->rep[1] = MEM_readLE32(dictPtr+4);
2896  bs->rep[2] = MEM_readLE32(dictPtr+8);
2897  dictPtr += 12;
2898 
2899  { size_t const dictContentSize = (size_t)(dictEnd - dictPtr);
2900  U32 offcodeMax = MaxOff;
2901  if (dictContentSize <= ((U32)-1) - 128 KB) {
2902  U32 const maxOffset = (U32)dictContentSize + 128 KB; /* The maximum offset that must be supported */
2903  offcodeMax = ZSTD_highbit32(maxOffset); /* Calculate minimum offset code required to represent maxOffset */
2904  }
2905  /* All offset values <= dictContentSize + 128 KB must be representable */
2906  CHECK_F (ZSTD_checkDictNCount(offcodeNCount, offcodeMaxValue, MIN(offcodeMax, MaxOff)));
2907  /* All repCodes must be <= dictContentSize and != 0*/
2908  { U32 u;
2909  for (u=0; u<3; u++) {
2910  if (bs->rep[u] == 0) return ERROR(dictionary_corrupted);
2911  if (bs->rep[u] > dictContentSize) return ERROR(dictionary_corrupted);
2912  } }
2913 
2914  bs->entropy.huf.repeatMode = HUF_repeat_valid;
2915  bs->entropy.fse.offcode_repeatMode = FSE_repeat_valid;
2916  bs->entropy.fse.matchlength_repeatMode = FSE_repeat_valid;
2917  bs->entropy.fse.litlength_repeatMode = FSE_repeat_valid;
2918  CHECK_F(ZSTD_loadDictionaryContent(ms, params, dictPtr, dictContentSize, dtlm));
2919  return dictID;
2920  }
2921 }
2922 
2925 static size_t
2926 ZSTD_compress_insertDictionary(ZSTD_compressedBlockState_t* bs,
2927  ZSTD_matchState_t* ms,
2928  const ZSTD_CCtx_params* params,
2929  const void* dict, size_t dictSize,
2930  ZSTD_dictContentType_e dictContentType,
2931  ZSTD_dictTableLoadMethod_e dtlm,
2932  void* workspace)
2933 {
2934  DEBUGLOG(4, "ZSTD_compress_insertDictionary (dictSize=%u)", (U32)dictSize);
2935  if ((dict==NULL) || (dictSize<=8)) return 0;
2936 
2937  ZSTD_reset_compressedBlockState(bs);
2938 
2939  /* dict restricted modes */
2940  if (dictContentType == ZSTD_dct_rawContent)
2941  return ZSTD_loadDictionaryContent(ms, params, dict, dictSize, dtlm);
2942 
2943  if (MEM_readLE32(dict) != ZSTD_MAGIC_DICTIONARY) {
2944  if (dictContentType == ZSTD_dct_auto) {
2945  DEBUGLOG(4, "raw content dictionary detected");
2946  return ZSTD_loadDictionaryContent(ms, params, dict, dictSize, dtlm);
2947  }
2948  if (dictContentType == ZSTD_dct_fullDict)
2949  return ERROR(dictionary_wrong);
2950  assert(0); /* impossible */
2951  }
2952 
2953  /* dict as full zstd dictionary */
2954  return ZSTD_loadZstdDictionary(bs, ms, params, dict, dictSize, dtlm, workspace);
2955 }
2956 
2959 static size_t ZSTD_compressBegin_internal(ZSTD_CCtx* cctx,
2960  const void* dict, size_t dictSize,
2961  ZSTD_dictContentType_e dictContentType,
2962  ZSTD_dictTableLoadMethod_e dtlm,
2963  const ZSTD_CDict* cdict,
2964  ZSTD_CCtx_params params, U64 pledgedSrcSize,
2965  ZSTD_buffered_policy_e zbuff)
2966 {
2967  DEBUGLOG(4, "ZSTD_compressBegin_internal: wlog=%u", params.cParams.windowLog);
2968  /* params are supposed to be fully validated at this point */
2969  assert(!ZSTD_isError(ZSTD_checkCParams(params.cParams)));
2970  assert(!((dict) && (cdict))); /* either dict or cdict, not both */
2971 
2972  if (cdict && cdict->dictContentSize>0) {
2973  return ZSTD_resetCCtx_usingCDict(cctx, cdict, params, pledgedSrcSize, zbuff);
2974  }
2975 
2976  CHECK_F( ZSTD_resetCCtx_internal(cctx, params, pledgedSrcSize,
2977  ZSTDcrp_continue, zbuff) );
2978  {
2979  size_t const dictID = ZSTD_compress_insertDictionary(
2980  cctx->blockState.prevCBlock, &cctx->blockState.matchState,
2981  &params, dict, dictSize, dictContentType, dtlm, cctx->entropyWorkspace);
2982  if (ZSTD_isError(dictID)) return dictID;
2983  assert(dictID <= (size_t)(U32)-1);
2984  cctx->dictID = (U32)dictID;
2985  }
2986  return 0;
2987 }
2988 
2989 size_t ZSTD_compressBegin_advanced_internal(ZSTD_CCtx* cctx,
2990  const void* dict, size_t dictSize,
2991  ZSTD_dictContentType_e dictContentType,
2992  ZSTD_dictTableLoadMethod_e dtlm,
2993  const ZSTD_CDict* cdict,
2994  ZSTD_CCtx_params params,
2995  unsigned long long pledgedSrcSize)
2996 {
2997  DEBUGLOG(4, "ZSTD_compressBegin_advanced_internal: wlog=%u", params.cParams.windowLog);
2998  /* compression parameters verification and optimization */
2999  CHECK_F( ZSTD_checkCParams(params.cParams) );
3000  return ZSTD_compressBegin_internal(cctx,
3001  dict, dictSize, dictContentType, dtlm,
3002  cdict,
3003  params, pledgedSrcSize,
3004  ZSTDb_not_buffered);
3005 }
3006 
3009 size_t ZSTD_compressBegin_advanced(ZSTD_CCtx* cctx,
3010  const void* dict, size_t dictSize,
3011  ZSTD_parameters params, unsigned long long pledgedSrcSize)
3012 {
3013  ZSTD_CCtx_params const cctxParams =
3014  ZSTD_assignParamsToCCtxParams(cctx->requestedParams, params);
3015  return ZSTD_compressBegin_advanced_internal(cctx,
3016  dict, dictSize, ZSTD_dct_auto, ZSTD_dtlm_fast,
3017  NULL /*cdict*/,
3018  cctxParams, pledgedSrcSize);
3019 }
3020 
3021 size_t ZSTD_compressBegin_usingDict(ZSTD_CCtx* cctx, const void* dict, size_t dictSize, int compressionLevel)
3022 {
3023  ZSTD_parameters const params = ZSTD_getParams(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, dictSize);
3024  ZSTD_CCtx_params const cctxParams =
3025  ZSTD_assignParamsToCCtxParams(cctx->requestedParams, params);
3026  DEBUGLOG(4, "ZSTD_compressBegin_usingDict (dictSize=%u)", (U32)dictSize);
3027  return ZSTD_compressBegin_internal(cctx, dict, dictSize, ZSTD_dct_auto, ZSTD_dtlm_fast, NULL,
3028  cctxParams, ZSTD_CONTENTSIZE_UNKNOWN, ZSTDb_not_buffered);
3029 }
3030 
3031 size_t ZSTD_compressBegin(ZSTD_CCtx* cctx, int compressionLevel)
3032 {
3033  return ZSTD_compressBegin_usingDict(cctx, NULL, 0, compressionLevel);
3034 }
3035 
3036 
3040 static size_t ZSTD_writeEpilogue(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity)
3041 {
3042  BYTE* const ostart = (BYTE*)dst;
3043  BYTE* op = ostart;
3044  size_t fhSize = 0;
3045 
3046  DEBUGLOG(4, "ZSTD_writeEpilogue");
3047  if (cctx->stage == ZSTDcs_created) return ERROR(stage_wrong); /* init missing */
3048 
3049  /* special case : empty frame */
3050  if (cctx->stage == ZSTDcs_init) {
3051  fhSize = ZSTD_writeFrameHeader(dst, dstCapacity, cctx->appliedParams, 0, 0);
3052  if (ZSTD_isError(fhSize)) return fhSize;
3053  dstCapacity -= fhSize;
3054  op += fhSize;
3055  cctx->stage = ZSTDcs_ongoing;
3056  }
3057 
3058  if (cctx->stage != ZSTDcs_ending) {
3059  /* write one last empty block, make it the "last" block */
3060  U32 const cBlockHeader24 = 1 /* last block */ + (((U32)bt_raw)<<1) + 0;
3061  if (dstCapacity<4) return ERROR(dstSize_tooSmall);
3062  MEM_writeLE32(op, cBlockHeader24);
3063  op += ZSTD_blockHeaderSize;
3064  dstCapacity -= ZSTD_blockHeaderSize;
3065  }
3066 
3067  if (cctx->appliedParams.fParams.checksumFlag) {
3068  U32 const checksum = (U32) XXH64_digest(&cctx->xxhState);
3069  if (dstCapacity<4) return ERROR(dstSize_tooSmall);
3070  DEBUGLOG(4, "ZSTD_writeEpilogue: write checksum : %08X", checksum);
3071  MEM_writeLE32(op, checksum);
3072  op += 4;
3073  }
3074 
3075  cctx->stage = ZSTDcs_created; /* return to "created but no init" status */
3076  return op-ostart;
3077 }
3078 
3079 size_t ZSTD_compressEnd (ZSTD_CCtx* cctx,
3080  void* dst, size_t dstCapacity,
3081  const void* src, size_t srcSize)
3082 {
3083  size_t endResult;
3084  size_t const cSize = ZSTD_compressContinue_internal(cctx,
3085  dst, dstCapacity, src, srcSize,
3086  1 /* frame mode */, 1 /* last chunk */);
3087  if (ZSTD_isError(cSize)) return cSize;
3088  endResult = ZSTD_writeEpilogue(cctx, (char*)dst + cSize, dstCapacity-cSize);
3089  if (ZSTD_isError(endResult)) return endResult;
3090  assert(!(cctx->appliedParams.fParams.contentSizeFlag && cctx->pledgedSrcSizePlusOne == 0));
3091  if (cctx->pledgedSrcSizePlusOne != 0) { /* control src size */
3092  ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_UNKNOWN == (unsigned long long)-1);
3093  DEBUGLOG(4, "end of frame : controlling src size");
3094  if (cctx->pledgedSrcSizePlusOne != cctx->consumedSrcSize+1) {
3095  DEBUGLOG(4, "error : pledgedSrcSize = %u, while realSrcSize = %u",
3096  (U32)cctx->pledgedSrcSizePlusOne-1, (U32)cctx->consumedSrcSize);
3097  return ERROR(srcSize_wrong);
3098  } }
3099  return cSize + endResult;
3100 }
3101 
3102 
3103 static size_t ZSTD_compress_internal (ZSTD_CCtx* cctx,
3104  void* dst, size_t dstCapacity,
3105  const void* src, size_t srcSize,
3106  const void* dict,size_t dictSize,
3107  ZSTD_parameters params)
3108 {
3109  ZSTD_CCtx_params const cctxParams =
3110  ZSTD_assignParamsToCCtxParams(cctx->requestedParams, params);
3111  DEBUGLOG(4, "ZSTD_compress_internal");
3112  return ZSTD_compress_advanced_internal(cctx,
3113  dst, dstCapacity,
3114  src, srcSize,
3115  dict, dictSize,
3116  cctxParams);
3117 }
3118 
3119 size_t ZSTD_compress_advanced (ZSTD_CCtx* cctx,
3120  void* dst, size_t dstCapacity,
3121  const void* src, size_t srcSize,
3122  const void* dict,size_t dictSize,
3123  ZSTD_parameters params)
3124 {
3125  DEBUGLOG(4, "ZSTD_compress_advanced");
3126  CHECK_F(ZSTD_checkCParams(params.cParams));
3127  return ZSTD_compress_internal(cctx,
3128  dst, dstCapacity,
3129  src, srcSize,
3130  dict, dictSize,
3131  params);
3132 }
3133 
3134 /* Internal */
3135 size_t ZSTD_compress_advanced_internal(
3136  ZSTD_CCtx* cctx,
3137  void* dst, size_t dstCapacity,
3138  const void* src, size_t srcSize,
3139  const void* dict,size_t dictSize,
3140  ZSTD_CCtx_params params)
3141 {
3142  DEBUGLOG(4, "ZSTD_compress_advanced_internal (srcSize:%u)", (U32)srcSize);
3143  CHECK_F( ZSTD_compressBegin_internal(cctx,
3144  dict, dictSize, ZSTD_dct_auto, ZSTD_dtlm_fast, NULL,
3145  params, srcSize, ZSTDb_not_buffered) );
3146  return ZSTD_compressEnd(cctx, dst, dstCapacity, src, srcSize);
3147 }
3148 
3149 size_t ZSTD_compress_usingDict(ZSTD_CCtx* cctx,
3150  void* dst, size_t dstCapacity,
3151  const void* src, size_t srcSize,
3152  const void* dict, size_t dictSize,
3153  int compressionLevel)
3154 {
3155  ZSTD_parameters const params = ZSTD_getParams(compressionLevel, srcSize + (!srcSize), dict ? dictSize : 0);
3156  ZSTD_CCtx_params cctxParams = ZSTD_assignParamsToCCtxParams(cctx->requestedParams, params);
3157  assert(params.fParams.contentSizeFlag == 1);
3158  return ZSTD_compress_advanced_internal(cctx, dst, dstCapacity, src, srcSize, dict, dictSize, cctxParams);
3159 }
3160 
3161 size_t ZSTD_compressCCtx(ZSTD_CCtx* cctx,
3162  void* dst, size_t dstCapacity,
3163  const void* src, size_t srcSize,
3164  int compressionLevel)
3165 {
3166  DEBUGLOG(4, "ZSTD_compressCCtx (srcSize=%u)", (U32)srcSize);
3167  assert(cctx != NULL);
3168  return ZSTD_compress_usingDict(cctx, dst, dstCapacity, src, srcSize, NULL, 0, compressionLevel);
3169 }
3170 
3171 size_t ZSTD_compress(void* dst, size_t dstCapacity,
3172  const void* src, size_t srcSize,
3173  int compressionLevel)
3174 {
3175  size_t result;
3176  ZSTD_CCtx ctxBody;
3177  ZSTD_initCCtx(&ctxBody, ZSTD_defaultCMem);
3178  result = ZSTD_compressCCtx(&ctxBody, dst, dstCapacity, src, srcSize, compressionLevel);
3179  ZSTD_freeCCtxContent(&ctxBody); /* can't free ctxBody itself, as it's on stack; free only heap content */
3180  return result;
3181 }
3182 
3183 
3184 /* ===== Dictionary API ===== */
3185 
3188 size_t ZSTD_estimateCDictSize_advanced(
3189  size_t dictSize, ZSTD_compressionParameters cParams,
3190  ZSTD_dictLoadMethod_e dictLoadMethod)
3191 {
3192  DEBUGLOG(5, "sizeof(ZSTD_CDict) : %u", (U32)sizeof(ZSTD_CDict));
3193  return sizeof(ZSTD_CDict) + HUF_WORKSPACE_SIZE + ZSTD_sizeof_matchState(&cParams, /* forCCtx */ 0)
3194  + (dictLoadMethod == ZSTD_dlm_byRef ? 0 : dictSize);
3195 }
3196 
3197 size_t ZSTD_estimateCDictSize(size_t dictSize, int compressionLevel)
3198 {
3199  ZSTD_compressionParameters const cParams = ZSTD_getCParams(compressionLevel, 0, dictSize);
3200  return ZSTD_estimateCDictSize_advanced(dictSize, cParams, ZSTD_dlm_byCopy);
3201 }
3202 
3203 size_t ZSTD_sizeof_CDict(const ZSTD_CDict* cdict)
3204 {
3205  if (cdict==NULL) return 0; /* support sizeof on NULL */
3206  DEBUGLOG(5, "sizeof(*cdict) : %u", (U32)sizeof(*cdict));
3207  return cdict->workspaceSize + (cdict->dictBuffer ? cdict->dictContentSize : 0) + sizeof(*cdict);
3208 }
3209 
3210 static size_t ZSTD_initCDict_internal(
3211  ZSTD_CDict* cdict,
3212  const void* dictBuffer, size_t dictSize,
3213  ZSTD_dictLoadMethod_e dictLoadMethod,
3214  ZSTD_dictContentType_e dictContentType,
3215  ZSTD_compressionParameters cParams)
3216 {
3217  DEBUGLOG(3, "ZSTD_initCDict_internal (dictContentType:%u)", (U32)dictContentType);
3218  assert(!ZSTD_checkCParams(cParams));
3219  cdict->matchState.cParams = cParams;
3220  if ((dictLoadMethod == ZSTD_dlm_byRef) || (!dictBuffer) || (!dictSize)) {
3221  cdict->dictBuffer = NULL;
3222  cdict->dictContent = dictBuffer;
3223  } else {
3224  void* const internalBuffer = ZSTD_malloc(dictSize, cdict->customMem);
3225  cdict->dictBuffer = internalBuffer;
3226  cdict->dictContent = internalBuffer;
3227  if (!internalBuffer) return ERROR(memory_allocation);
3228  memcpy(internalBuffer, dictBuffer, dictSize);
3229  }
3230  cdict->dictContentSize = dictSize;
3231 
3232  /* Reset the state to no dictionary */
3233  ZSTD_reset_compressedBlockState(&cdict->cBlockState);
3234  { void* const end = ZSTD_reset_matchState(
3235  &cdict->matchState,
3236  (U32*)cdict->workspace + HUF_WORKSPACE_SIZE_U32,
3237  &cParams, ZSTDcrp_continue, /* forCCtx */ 0);
3238  assert(end == (char*)cdict->workspace + cdict->workspaceSize);
3239  (void)end;
3240  }
3241  /* (Maybe) load the dictionary
3242  * Skips loading the dictionary if it is <= 8 bytes.
3243  */
3244  { ZSTD_CCtx_params params;
3245  memset(&params, 0, sizeof(params));
3246  params.compressionLevel = ZSTD_CLEVEL_DEFAULT;
3247  params.fParams.contentSizeFlag = 1;
3248  params.cParams = cParams;
3249  { size_t const dictID = ZSTD_compress_insertDictionary(
3250  &cdict->cBlockState, &cdict->matchState, &params,
3251  cdict->dictContent, cdict->dictContentSize,
3252  dictContentType, ZSTD_dtlm_full, cdict->workspace);
3253  if (ZSTD_isError(dictID)) return dictID;
3254  assert(dictID <= (size_t)(U32)-1);
3255  cdict->dictID = (U32)dictID;
3256  }
3257  }
3258 
3259  return 0;
3260 }
3261 
3262 ZSTD_CDict* ZSTD_createCDict_advanced(const void* dictBuffer, size_t dictSize,
3263  ZSTD_dictLoadMethod_e dictLoadMethod,
3264  ZSTD_dictContentType_e dictContentType,
3265  ZSTD_compressionParameters cParams, ZSTD_customMem customMem)
3266 {
3267  DEBUGLOG(3, "ZSTD_createCDict_advanced, mode %u", (U32)dictContentType);
3268  if (!customMem.customAlloc ^ !customMem.customFree) return NULL;
3269 
3270  { ZSTD_CDict* const cdict = (ZSTD_CDict*)ZSTD_malloc(sizeof(ZSTD_CDict), customMem);
3271  size_t const workspaceSize = HUF_WORKSPACE_SIZE + ZSTD_sizeof_matchState(&cParams, /* forCCtx */ 0);
3272  void* const workspace = ZSTD_malloc(workspaceSize, customMem);
3273 
3274  if (!cdict || !workspace) {
3275  ZSTD_free(cdict, customMem);
3276  ZSTD_free(workspace, customMem);
3277  return NULL;
3278  }
3279  cdict->customMem = customMem;
3280  cdict->workspace = workspace;
3281  cdict->workspaceSize = workspaceSize;
3282  if (ZSTD_isError( ZSTD_initCDict_internal(cdict,
3283  dictBuffer, dictSize,
3284  dictLoadMethod, dictContentType,
3285  cParams) )) {
3286  ZSTD_freeCDict(cdict);
3287  return NULL;
3288  }
3289 
3290  return cdict;
3291  }
3292 }
3293 
3294 ZSTD_CDict* ZSTD_createCDict(const void* dict, size_t dictSize, int compressionLevel)
3295 {
3296  ZSTD_compressionParameters cParams = ZSTD_getCParams(compressionLevel, 0, dictSize);
3297  return ZSTD_createCDict_advanced(dict, dictSize,
3298  ZSTD_dlm_byCopy, ZSTD_dct_auto,
3299  cParams, ZSTD_defaultCMem);
3300 }
3301 
3302 ZSTD_CDict* ZSTD_createCDict_byReference(const void* dict, size_t dictSize, int compressionLevel)
3303 {
3304  ZSTD_compressionParameters cParams = ZSTD_getCParams(compressionLevel, 0, dictSize);
3305  return ZSTD_createCDict_advanced(dict, dictSize,
3306  ZSTD_dlm_byRef, ZSTD_dct_auto,
3307  cParams, ZSTD_defaultCMem);
3308 }
3309 
3310 size_t ZSTD_freeCDict(ZSTD_CDict* cdict)
3311 {
3312  if (cdict==NULL) return 0; /* support free on NULL */
3313  { ZSTD_customMem const cMem = cdict->customMem;
3314  ZSTD_free(cdict->workspace, cMem);
3315  ZSTD_free(cdict->dictBuffer, cMem);
3316  ZSTD_free(cdict, cMem);
3317  return 0;
3318  }
3319 }
3320 
3334 const ZSTD_CDict* ZSTD_initStaticCDict(
3335  void* workspace, size_t workspaceSize,
3336  const void* dict, size_t dictSize,
3337  ZSTD_dictLoadMethod_e dictLoadMethod,
3338  ZSTD_dictContentType_e dictContentType,
3339  ZSTD_compressionParameters cParams)
3340 {
3341  size_t const matchStateSize = ZSTD_sizeof_matchState(&cParams, /* forCCtx */ 0);
3342  size_t const neededSize = sizeof(ZSTD_CDict) + (dictLoadMethod == ZSTD_dlm_byRef ? 0 : dictSize)
3343  + HUF_WORKSPACE_SIZE + matchStateSize;
3344  ZSTD_CDict* const cdict = (ZSTD_CDict*) workspace;
3345  void* ptr;
3346  if ((size_t)workspace & 7) return NULL; /* 8-aligned */
3347  DEBUGLOG(4, "(workspaceSize < neededSize) : (%u < %u) => %u",
3348  (U32)workspaceSize, (U32)neededSize, (U32)(workspaceSize < neededSize));
3349  if (workspaceSize < neededSize) return NULL;
3350 
3351  if (dictLoadMethod == ZSTD_dlm_byCopy) {
3352  memcpy(cdict+1, dict, dictSize);
3353  dict = cdict+1;
3354  ptr = (char*)workspace + sizeof(ZSTD_CDict) + dictSize;
3355  } else {
3356  ptr = cdict+1;
3357  }
3358  cdict->workspace = ptr;
3359  cdict->workspaceSize = HUF_WORKSPACE_SIZE + matchStateSize;
3360 
3361  if (ZSTD_isError( ZSTD_initCDict_internal(cdict,
3362  dict, dictSize,
3363  ZSTD_dlm_byRef, dictContentType,
3364  cParams) ))
3365  return NULL;
3366 
3367  return cdict;
3368 }
3369 
3370 ZSTD_compressionParameters ZSTD_getCParamsFromCDict(const ZSTD_CDict* cdict)
3371 {
3372  assert(cdict != NULL);
3373  return cdict->matchState.cParams;
3374 }
3375 
3376 /* ZSTD_compressBegin_usingCDict_advanced() :
3377  * cdict must be != NULL */
3378 size_t ZSTD_compressBegin_usingCDict_advanced(
3379  ZSTD_CCtx* const cctx, const ZSTD_CDict* const cdict,
3380  ZSTD_frameParameters const fParams, unsigned long long const pledgedSrcSize)
3381 {
3382  DEBUGLOG(4, "ZSTD_compressBegin_usingCDict_advanced");
3383  if (cdict==NULL) return ERROR(dictionary_wrong);
3384  { ZSTD_CCtx_params params = cctx->requestedParams;
3385  params.cParams = ZSTD_getCParamsFromCDict(cdict);
3386  /* Increase window log to fit the entire dictionary and source if the
3387  * source size is known. Limit the increase to 19, which is the
3388  * window log for compression level 1 with the largest source size.
3389  */
3390  if (pledgedSrcSize != ZSTD_CONTENTSIZE_UNKNOWN) {
3391  U32 const limitedSrcSize = (U32)MIN(pledgedSrcSize, 1U << 19);
3392  U32 const limitedSrcLog = limitedSrcSize > 1 ? ZSTD_highbit32(limitedSrcSize - 1) + 1 : 1;
3393  params.cParams.windowLog = MAX(params.cParams.windowLog, limitedSrcLog);
3394  }
3395  params.fParams = fParams;
3396  return ZSTD_compressBegin_internal(cctx,
3397  NULL, 0, ZSTD_dct_auto, ZSTD_dtlm_fast,
3398  cdict,
3399  params, pledgedSrcSize,
3400  ZSTDb_not_buffered);
3401  }
3402 }
3403 
3404 /* ZSTD_compressBegin_usingCDict() :
3405  * pledgedSrcSize=0 means "unknown"
3406  * if pledgedSrcSize>0, it will enable contentSizeFlag */
3407 size_t ZSTD_compressBegin_usingCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict)
3408 {
3409  ZSTD_frameParameters const fParams = { 0 /*content*/, 0 /*checksum*/, 0 /*noDictID*/ };
3410  DEBUGLOG(4, "ZSTD_compressBegin_usingCDict : dictIDFlag == %u", !fParams.noDictIDFlag);
3411  return ZSTD_compressBegin_usingCDict_advanced(cctx, cdict, fParams, ZSTD_CONTENTSIZE_UNKNOWN);
3412 }
3413 
3414 size_t ZSTD_compress_usingCDict_advanced(ZSTD_CCtx* cctx,
3415  void* dst, size_t dstCapacity,
3416  const void* src, size_t srcSize,
3417  const ZSTD_CDict* cdict, ZSTD_frameParameters fParams)
3418 {
3419  CHECK_F (ZSTD_compressBegin_usingCDict_advanced(cctx, cdict, fParams, srcSize)); /* will check if cdict != NULL */
3420  return ZSTD_compressEnd(cctx, dst, dstCapacity, src, srcSize);
3421 }
3422 
3428 size_t ZSTD_compress_usingCDict(ZSTD_CCtx* cctx,
3429  void* dst, size_t dstCapacity,
3430  const void* src, size_t srcSize,
3431  const ZSTD_CDict* cdict)
3432 {
3433  ZSTD_frameParameters const fParams = { 1 /*content*/, 0 /*checksum*/, 0 /*noDictID*/ };
3434  return ZSTD_compress_usingCDict_advanced(cctx, dst, dstCapacity, src, srcSize, cdict, fParams);
3435 }
3436 
3437 
3438 
3439 /* ******************************************************************
3440 * Streaming
3441 ********************************************************************/
3442 
3443 ZSTD_CStream* ZSTD_createCStream(void)
3444 {
3445  DEBUGLOG(3, "ZSTD_createCStream");
3446  return ZSTD_createCStream_advanced(ZSTD_defaultCMem);
3447 }
3448 
3449 ZSTD_CStream* ZSTD_initStaticCStream(void *workspace, size_t workspaceSize)
3450 {
3451  return ZSTD_initStaticCCtx(workspace, workspaceSize);
3452 }
3453 
3454 ZSTD_CStream* ZSTD_createCStream_advanced(ZSTD_customMem customMem)
3455 { /* CStream and CCtx are now same object */
3456  return ZSTD_createCCtx_advanced(customMem);
3457 }
3458 
3459 size_t ZSTD_freeCStream(ZSTD_CStream* zcs)
3460 {
3461  return ZSTD_freeCCtx(zcs); /* same object */
3462 }
3463 
3464 
3465 
3466 /*====== Initialization ======*/
3467 
3468 size_t ZSTD_CStreamInSize(void) { return ZSTD_BLOCKSIZE_MAX; }
3469 
3470 size_t ZSTD_CStreamOutSize(void)
3471 {
3472  return ZSTD_compressBound(ZSTD_BLOCKSIZE_MAX) + ZSTD_blockHeaderSize + 4 /* 32-bits hash */ ;
3473 }
3474 
3475 static size_t ZSTD_resetCStream_internal(ZSTD_CStream* cctx,
3476  const void* const dict, size_t const dictSize, ZSTD_dictContentType_e const dictContentType,
3477  const ZSTD_CDict* const cdict,
3478  ZSTD_CCtx_params params, unsigned long long const pledgedSrcSize)
3479 {
3480  DEBUGLOG(4, "ZSTD_resetCStream_internal");
3481  /* Finalize the compression parameters */
3482  params.cParams = ZSTD_getCParamsFromCCtxParams(&params, pledgedSrcSize, dictSize);
3483  /* params are supposed to be fully validated at this point */
3484  assert(!ZSTD_isError(ZSTD_checkCParams(params.cParams)));
3485  assert(!((dict) && (cdict))); /* either dict or cdict, not both */
3486 
3487  CHECK_F( ZSTD_compressBegin_internal(cctx,
3488  dict, dictSize, dictContentType, ZSTD_dtlm_fast,
3489  cdict,
3490  params, pledgedSrcSize,
3491  ZSTDb_buffered) );
3492 
3493  cctx->inToCompress = 0;
3494  cctx->inBuffPos = 0;
3495  cctx->inBuffTarget = cctx->blockSize
3496  + (cctx->blockSize == pledgedSrcSize); /* for small input: avoid automatic flush on reaching end of block, since it would require to add a 3-bytes null block to end frame */
3497  cctx->outBuffContentSize = cctx->outBuffFlushedSize = 0;
3498  cctx->streamStage = zcss_load;
3499  cctx->frameEnded = 0;
3500  return 0; /* ready to go */
3501 }
3502 
3503 /* ZSTD_resetCStream():
3504  * pledgedSrcSize == 0 means "unknown" */
3505 size_t ZSTD_resetCStream(ZSTD_CStream* zcs, unsigned long long pledgedSrcSize)
3506 {
3507  ZSTD_CCtx_params params = zcs->requestedParams;
3508  DEBUGLOG(4, "ZSTD_resetCStream: pledgedSrcSize = %u", (U32)pledgedSrcSize);
3509  if (pledgedSrcSize==0) pledgedSrcSize = ZSTD_CONTENTSIZE_UNKNOWN;
3510  params.fParams.contentSizeFlag = 1;
3511  return ZSTD_resetCStream_internal(zcs, NULL, 0, ZSTD_dct_auto, zcs->cdict, params, pledgedSrcSize);
3512 }
3513 
3518 size_t ZSTD_initCStream_internal(ZSTD_CStream* zcs,
3519  const void* dict, size_t dictSize, const ZSTD_CDict* cdict,
3520  ZSTD_CCtx_params params, unsigned long long pledgedSrcSize)
3521 {
3522  DEBUGLOG(4, "ZSTD_initCStream_internal");
3523  params.cParams = ZSTD_getCParamsFromCCtxParams(&params, pledgedSrcSize, dictSize);
3524  assert(!ZSTD_isError(ZSTD_checkCParams(params.cParams)));
3525  assert(!((dict) && (cdict))); /* either dict or cdict, not both */
3526 
3527  if (dict && dictSize >= 8) {
3528  DEBUGLOG(4, "loading dictionary of size %u", (U32)dictSize);
3529  if (zcs->staticSize) { /* static CCtx : never uses malloc */
3530  /* incompatible with internal cdict creation */
3531  return ERROR(memory_allocation);
3532  }
3533  ZSTD_freeCDict(zcs->cdictLocal);
3534  zcs->cdictLocal = ZSTD_createCDict_advanced(dict, dictSize,
3535  ZSTD_dlm_byCopy, ZSTD_dct_auto,
3536  params.cParams, zcs->customMem);
3537  zcs->cdict = zcs->cdictLocal;
3538  if (zcs->cdictLocal == NULL) return ERROR(memory_allocation);
3539  } else {
3540  if (cdict) {
3541  params.cParams = ZSTD_getCParamsFromCDict(cdict); /* cParams are enforced from cdict; it includes windowLog */
3542  }
3543  ZSTD_freeCDict(zcs->cdictLocal);
3544  zcs->cdictLocal = NULL;
3545  zcs->cdict = cdict;
3546  }
3547 
3548  return ZSTD_resetCStream_internal(zcs, NULL, 0, ZSTD_dct_auto, zcs->cdict, params, pledgedSrcSize);
3549 }
3550 
3551 /* ZSTD_initCStream_usingCDict_advanced() :
3552  * same as ZSTD_initCStream_usingCDict(), with control over frame parameters */
3553 size_t ZSTD_initCStream_usingCDict_advanced(ZSTD_CStream* zcs,
3554  const ZSTD_CDict* cdict,
3555  ZSTD_frameParameters fParams,
3556  unsigned long long pledgedSrcSize)
3557 {
3558  DEBUGLOG(4, "ZSTD_initCStream_usingCDict_advanced");
3559  if (!cdict) return ERROR(dictionary_wrong); /* cannot handle NULL cdict (does not know what to do) */
3560  { ZSTD_CCtx_params params = zcs->requestedParams;
3561  params.cParams = ZSTD_getCParamsFromCDict(cdict);
3562  params.fParams = fParams;
3563  return ZSTD_initCStream_internal(zcs,
3564  NULL, 0, cdict,
3565  params, pledgedSrcSize);
3566  }
3567 }
3568 
3569 /* note : cdict must outlive compression session */
3570 size_t ZSTD_initCStream_usingCDict(ZSTD_CStream* zcs, const ZSTD_CDict* cdict)
3571 {
3572  ZSTD_frameParameters const fParams = { 0 /* contentSizeFlag */, 0 /* checksum */, 0 /* hideDictID */ };
3573  DEBUGLOG(4, "ZSTD_initCStream_usingCDict");
3574  return ZSTD_initCStream_usingCDict_advanced(zcs, cdict, fParams, ZSTD_CONTENTSIZE_UNKNOWN); /* note : will check that cdict != NULL */
3575 }
3576 
3577 
3578 /* ZSTD_initCStream_advanced() :
3579  * pledgedSrcSize must be exact.
3580  * if srcSize is not known at init time, use value ZSTD_CONTENTSIZE_UNKNOWN.
3581  * dict is loaded with default parameters ZSTD_dm_auto and ZSTD_dlm_byCopy. */
3582 size_t ZSTD_initCStream_advanced(ZSTD_CStream* zcs,
3583  const void* dict, size_t dictSize,
3584  ZSTD_parameters params, unsigned long long pledgedSrcSize)
3585 {
3586  DEBUGLOG(4, "ZSTD_initCStream_advanced: pledgedSrcSize=%u, flag=%u",
3587  (U32)pledgedSrcSize, params.fParams.contentSizeFlag);
3588  CHECK_F( ZSTD_checkCParams(params.cParams) );
3589  if ((pledgedSrcSize==0) && (params.fParams.contentSizeFlag==0)) pledgedSrcSize = ZSTD_CONTENTSIZE_UNKNOWN; /* for compatibility with older programs relying on this behavior. Users should now specify ZSTD_CONTENTSIZE_UNKNOWN. This line will be removed in the future. */
3590  zcs->requestedParams = ZSTD_assignParamsToCCtxParams(zcs->requestedParams, params);
3591  return ZSTD_initCStream_internal(zcs, dict, dictSize, NULL /*cdict*/, zcs->requestedParams, pledgedSrcSize);
3592 }
3593 
3594 size_t ZSTD_initCStream_usingDict(ZSTD_CStream* zcs, const void* dict, size_t dictSize, int compressionLevel)
3595 {
3596  ZSTD_CCtxParams_init(&zcs->requestedParams, compressionLevel);
3597  return ZSTD_initCStream_internal(zcs, dict, dictSize, NULL, zcs->requestedParams, ZSTD_CONTENTSIZE_UNKNOWN);
3598 }
3599 
3600 size_t ZSTD_initCStream_srcSize(ZSTD_CStream* zcs, int compressionLevel, unsigned long long pss)
3601 {
3602  U64 const pledgedSrcSize = (pss==0) ? ZSTD_CONTENTSIZE_UNKNOWN : pss; /* temporary : 0 interpreted as "unknown" during transition period. Users willing to specify "unknown" **must** use ZSTD_CONTENTSIZE_UNKNOWN. `0` will be interpreted as "empty" in the future */
3603  ZSTD_CCtxParams_init(&zcs->requestedParams, compressionLevel);
3604  return ZSTD_initCStream_internal(zcs, NULL, 0, NULL, zcs->requestedParams, pledgedSrcSize);
3605 }
3606 
3607 size_t ZSTD_initCStream(ZSTD_CStream* zcs, int compressionLevel)
3608 {
3609  DEBUGLOG(4, "ZSTD_initCStream");
3610  return ZSTD_initCStream_srcSize(zcs, compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN);
3611 }
3612 
3613 /*====== Compression ======*/
3614 
3615 MEM_STATIC size_t ZSTD_limitCopy(void* dst, size_t dstCapacity,
3616  const void* src, size_t srcSize)
3617 {
3618  size_t const length = MIN(dstCapacity, srcSize);
3619  if (length) memcpy(dst, src, length);
3620  return length;
3621 }
3622 
3627 size_t ZSTD_compressStream_generic(ZSTD_CStream* zcs,
3628  ZSTD_outBuffer* output,
3629  ZSTD_inBuffer* input,
3630  ZSTD_EndDirective const flushMode)
3631 {
3632  const char* const istart = (const char*)input->src;
3633  const char* const iend = istart + input->size;
3634  const char* ip = istart + input->pos;
3635  char* const ostart = (char*)output->dst;
3636  char* const oend = ostart + output->size;
3637  char* op = ostart + output->pos;
3638  U32 someMoreWork = 1;
3639 
3640  /* check expectations */
3641  DEBUGLOG(5, "ZSTD_compressStream_generic, flush=%u", (U32)flushMode);
3642  assert(zcs->inBuff != NULL);
3643  assert(zcs->inBuffSize > 0);
3644  assert(zcs->outBuff != NULL);
3645  assert(zcs->outBuffSize > 0);
3646  assert(output->pos <= output->size);
3647  assert(input->pos <= input->size);
3648 
3649  while (someMoreWork) {
3650  switch(zcs->streamStage)
3651  {
3652  case zcss_init:
3653  /* call ZSTD_initCStream() first ! */
3654  return ERROR(init_missing);
3655 
3656  case zcss_load:
3657  if ( (flushMode == ZSTD_e_end)
3658  && ((size_t)(oend-op) >= ZSTD_compressBound(iend-ip)) /* enough dstCapacity */
3659  && (zcs->inBuffPos == 0) ) {
3660  /* shortcut to compression pass directly into output buffer */
3661  size_t const cSize = ZSTD_compressEnd(zcs,
3662  op, oend-op, ip, iend-ip);
3663  DEBUGLOG(4, "ZSTD_compressEnd : %u", (U32)cSize);
3664  if (ZSTD_isError(cSize)) return cSize;
3665  ip = iend;
3666  op += cSize;
3667  zcs->frameEnded = 1;
3668  ZSTD_CCtx_reset(zcs);
3669  someMoreWork = 0; break;
3670  }
3671  /* complete loading into inBuffer */
3672  { size_t const toLoad = zcs->inBuffTarget - zcs->inBuffPos;
3673  size_t const loaded = ZSTD_limitCopy(
3674  zcs->inBuff + zcs->inBuffPos, toLoad,
3675  ip, iend-ip);
3676  zcs->inBuffPos += loaded;
3677  ip += loaded;
3678  if ( (flushMode == ZSTD_e_continue)
3679  && (zcs->inBuffPos < zcs->inBuffTarget) ) {
3680  /* not enough input to fill full block : stop here */
3681  someMoreWork = 0; break;
3682  }
3683  if ( (flushMode == ZSTD_e_flush)
3684  && (zcs->inBuffPos == zcs->inToCompress) ) {
3685  /* empty */
3686  someMoreWork = 0; break;
3687  }
3688  }
3689  /* compress current block (note : this stage cannot be stopped in the middle) */
3690  DEBUGLOG(5, "stream compression stage (flushMode==%u)", flushMode);
3691  { void* cDst;
3692  size_t cSize;
3693  size_t const iSize = zcs->inBuffPos - zcs->inToCompress;
3694  size_t oSize = oend-op;
3695  unsigned const lastBlock = (flushMode == ZSTD_e_end) && (ip==iend);
3696  if (oSize >= ZSTD_compressBound(iSize))
3697  cDst = op; /* compress into output buffer, to skip flush stage */
3698  else
3699  cDst = zcs->outBuff, oSize = zcs->outBuffSize;
3700  cSize = lastBlock ?
3701  ZSTD_compressEnd(zcs, cDst, oSize,
3702  zcs->inBuff + zcs->inToCompress, iSize) :
3703  ZSTD_compressContinue(zcs, cDst, oSize,
3704  zcs->inBuff + zcs->inToCompress, iSize);
3705  if (ZSTD_isError(cSize)) return cSize;
3706  zcs->frameEnded = lastBlock;
3707  /* prepare next block */
3708  zcs->inBuffTarget = zcs->inBuffPos + zcs->blockSize;
3709  if (zcs->inBuffTarget > zcs->inBuffSize)
3710  zcs->inBuffPos = 0, zcs->inBuffTarget = zcs->blockSize;
3711  DEBUGLOG(5, "inBuffTarget:%u / inBuffSize:%u",
3712  (U32)zcs->inBuffTarget, (U32)zcs->inBuffSize);
3713  if (!lastBlock)
3714  assert(zcs->inBuffTarget <= zcs->inBuffSize);
3715  zcs->inToCompress = zcs->inBuffPos;
3716  if (cDst == op) { /* no need to flush */
3717  op += cSize;
3718  if (zcs->frameEnded) {
3719  DEBUGLOG(5, "Frame completed directly in outBuffer");
3720  someMoreWork = 0;
3721  ZSTD_CCtx_reset(zcs);
3722  }
3723  break;
3724  }
3725  zcs->outBuffContentSize = cSize;
3726  zcs->outBuffFlushedSize = 0;
3727  zcs->streamStage = zcss_flush; /* pass-through to flush stage */
3728  }
3729  /* fall-through */
3730  case zcss_flush:
3731  DEBUGLOG(5, "flush stage");
3732  { size_t const toFlush = zcs->outBuffContentSize - zcs->outBuffFlushedSize;
3733  size_t const flushed = ZSTD_limitCopy(op, oend-op,
3734  zcs->outBuff + zcs->outBuffFlushedSize, toFlush);
3735  DEBUGLOG(5, "toFlush: %u into %u ==> flushed: %u",
3736  (U32)toFlush, (U32)(oend-op), (U32)flushed);
3737  op += flushed;
3738  zcs->outBuffFlushedSize += flushed;
3739  if (toFlush!=flushed) {
3740  /* flush not fully completed, presumably because dst is too small */
3741  assert(op==oend);
3742  someMoreWork = 0;
3743  break;
3744  }
3745  zcs->outBuffContentSize = zcs->outBuffFlushedSize = 0;
3746  if (zcs->frameEnded) {
3747  DEBUGLOG(5, "Frame completed on flush");
3748  someMoreWork = 0;
3749  ZSTD_CCtx_reset(zcs);
3750  break;
3751  }
3752  zcs->streamStage = zcss_load;
3753  break;
3754  }
3755 
3756  default: /* impossible */
3757  assert(0);
3758  }
3759  }
3760 
3761  input->pos = ip - istart;
3762  output->pos = op - ostart;
3763  if (zcs->frameEnded) return 0;
3764  { size_t hintInSize = zcs->inBuffTarget - zcs->inBuffPos;
3765  if (hintInSize==0) hintInSize = zcs->blockSize;
3766  return hintInSize;
3767  }
3768 }
3769 
3770 size_t ZSTD_compressStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output, ZSTD_inBuffer* input)
3771 {
3772  /* check conditions */
3773  if (output->pos > output->size) return ERROR(GENERIC);
3774  if (input->pos > input->size) return ERROR(GENERIC);
3775 
3776  return ZSTD_compressStream_generic(zcs, output, input, ZSTD_e_continue);
3777 }
3778 
3779 
3780 size_t ZSTD_compress_generic (ZSTD_CCtx* cctx,
3781  ZSTD_outBuffer* output,
3782  ZSTD_inBuffer* input,
3783  ZSTD_EndDirective endOp)
3784 {
3785  DEBUGLOG(5, "ZSTD_compress_generic, endOp=%u ", (U32)endOp);
3786  /* check conditions */
3787  if (output->pos > output->size) return ERROR(GENERIC);
3788  if (input->pos > input->size) return ERROR(GENERIC);
3789  assert(cctx!=NULL);
3790 
3791  /* transparent initialization stage */
3792  if (cctx->streamStage == zcss_init) {
3793  ZSTD_CCtx_params params = cctx->requestedParams;
3794  ZSTD_prefixDict const prefixDict = cctx->prefixDict;
3795  memset(&cctx->prefixDict, 0, sizeof(cctx->prefixDict)); /* single usage */
3796  assert(prefixDict.dict==NULL || cctx->cdict==NULL); /* only one can be set */
3797  DEBUGLOG(4, "ZSTD_compress_generic : transparent init stage");
3798  if (endOp == ZSTD_e_end) cctx->pledgedSrcSizePlusOne = input->size + 1; /* auto-fix pledgedSrcSize */
3799  params.cParams = ZSTD_getCParamsFromCCtxParams(
3800  &cctx->requestedParams, cctx->pledgedSrcSizePlusOne-1, 0 /*dictSize*/);
3801 
3802 
3803 #ifdef ZSTD_MULTITHREAD
3804  if ((cctx->pledgedSrcSizePlusOne-1) <= ZSTDMT_JOBSIZE_MIN) {
3805  params.nbWorkers = 0; /* do not invoke multi-threading when src size is too small */
3806  }
3807  if (params.nbWorkers > 0) {
3808  /* mt context creation */
3809  if (cctx->mtctx == NULL) {
3810  DEBUGLOG(4, "ZSTD_compress_generic: creating new mtctx for nbWorkers=%u",
3811  params.nbWorkers);
3812  cctx->mtctx = ZSTDMT_createCCtx_advanced(params.nbWorkers, cctx->customMem);
3813  if (cctx->mtctx == NULL) return ERROR(memory_allocation);
3814  }
3815  /* mt compression */
3816  DEBUGLOG(4, "call ZSTDMT_initCStream_internal as nbWorkers=%u", params.nbWorkers);
3817  CHECK_F( ZSTDMT_initCStream_internal(
3818  cctx->mtctx,
3819  prefixDict.dict, prefixDict.dictSize, ZSTD_dct_rawContent,
3820  cctx->cdict, params, cctx->pledgedSrcSizePlusOne-1) );
3821  cctx->streamStage = zcss_load;
3822  cctx->appliedParams.nbWorkers = params.nbWorkers;
3823  } else
3824 #endif
3825  { CHECK_F( ZSTD_resetCStream_internal(cctx,
3826  prefixDict.dict, prefixDict.dictSize, prefixDict.dictContentType,
3827  cctx->cdict,
3828  params, cctx->pledgedSrcSizePlusOne-1) );
3829  assert(cctx->streamStage == zcss_load);
3830  assert(cctx->appliedParams.nbWorkers == 0);
3831  } }
3832 
3833  /* compression stage */
3834 #ifdef ZSTD_MULTITHREAD
3835  if (cctx->appliedParams.nbWorkers > 0) {
3836  if (cctx->cParamsChanged) {
3837  ZSTDMT_updateCParams_whileCompressing(cctx->mtctx, &cctx->requestedParams);
3838  cctx->cParamsChanged = 0;
3839  }
3840  { size_t const flushMin = ZSTDMT_compressStream_generic(cctx->mtctx, output, input, endOp);
3841  if ( ZSTD_isError(flushMin)
3842  || (endOp == ZSTD_e_end && flushMin == 0) ) { /* compression completed */
3843  ZSTD_CCtx_reset(cctx);
3844  }
3845  DEBUGLOG(5, "completed ZSTD_compress_generic delegating to ZSTDMT_compressStream_generic");
3846  return flushMin;
3847  } }
3848 #endif
3849  CHECK_F( ZSTD_compressStream_generic(cctx, output, input, endOp) );
3850  DEBUGLOG(5, "completed ZSTD_compress_generic");
3851  return cctx->outBuffContentSize - cctx->outBuffFlushedSize; /* remaining to flush */
3852 }
3853 
3854 size_t ZSTD_compress_generic_simpleArgs (
3855  ZSTD_CCtx* cctx,
3856  void* dst, size_t dstCapacity, size_t* dstPos,
3857  const void* src, size_t srcSize, size_t* srcPos,
3858  ZSTD_EndDirective endOp)
3859 {
3860  ZSTD_outBuffer output = { dst, dstCapacity, *dstPos };
3861  ZSTD_inBuffer input = { src, srcSize, *srcPos };
3862  /* ZSTD_compress_generic() will check validity of dstPos and srcPos */
3863  size_t const cErr = ZSTD_compress_generic(cctx, &output, &input, endOp);
3864  *dstPos = output.pos;
3865  *srcPos = input.pos;
3866  return cErr;
3867 }
3868 
3869 
3870 /*====== Finalize ======*/
3871 
3874 size_t ZSTD_flushStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output)
3875 {
3876  ZSTD_inBuffer input = { NULL, 0, 0 };
3877  if (output->pos > output->size) return ERROR(GENERIC);
3878  CHECK_F( ZSTD_compressStream_generic(zcs, output, &input, ZSTD_e_flush) );
3879  return zcs->outBuffContentSize - zcs->outBuffFlushedSize; /* remaining to flush */
3880 }
3881 
3882 
3883 size_t ZSTD_endStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output)
3884 {
3885  ZSTD_inBuffer input = { NULL, 0, 0 };
3886  if (output->pos > output->size) return ERROR(GENERIC);
3887  CHECK_F( ZSTD_compressStream_generic(zcs, output, &input, ZSTD_e_end) );
3888  { size_t const lastBlockSize = zcs->frameEnded ? 0 : ZSTD_BLOCKHEADERSIZE;
3889  size_t const checksumSize = zcs->frameEnded ? 0 : zcs->appliedParams.fParams.checksumFlag * 4;
3890  size_t const toFlush = zcs->outBuffContentSize - zcs->outBuffFlushedSize + lastBlockSize + checksumSize;
3891  DEBUGLOG(4, "ZSTD_endStream : remaining to flush : %u", (U32)toFlush);
3892  return toFlush;
3893  }
3894 }
3895 
3896 
3897 /*-===== Pre-defined compression levels =====-*/
3898 
3899 #define ZSTD_MAX_CLEVEL 22
3900 int ZSTD_maxCLevel(void) { return ZSTD_MAX_CLEVEL; }
3901 int ZSTD_minCLevel(void) { return (int)-ZSTD_TARGETLENGTH_MAX; }
3902 
3903 static const ZSTD_compressionParameters ZSTD_defaultCParameters[4][ZSTD_MAX_CLEVEL+1] = {
3904 { /* "default" - guarantees a monotonically increasing memory budget */
3905  /* W, C, H, S, L, TL, strat */
3906  { 19, 12, 13, 1, 6, 1, ZSTD_fast }, /* base for negative levels */
3907  { 19, 13, 14, 1, 7, 0, ZSTD_fast }, /* level 1 */
3908  { 19, 15, 16, 1, 6, 0, ZSTD_fast }, /* level 2 */
3909  { 20, 16, 17, 1, 5, 1, ZSTD_dfast }, /* level 3 */
3910  { 20, 18, 18, 1, 5, 1, ZSTD_dfast }, /* level 4 */
3911  { 20, 18, 18, 2, 5, 2, ZSTD_greedy }, /* level 5 */
3912  { 21, 18, 19, 2, 5, 4, ZSTD_lazy }, /* level 6 */
3913  { 21, 18, 19, 3, 5, 8, ZSTD_lazy2 }, /* level 7 */
3914  { 21, 19, 19, 3, 5, 16, ZSTD_lazy2 }, /* level 8 */
3915  { 21, 19, 20, 4, 5, 16, ZSTD_lazy2 }, /* level 9 */
3916  { 21, 20, 21, 4, 5, 16, ZSTD_lazy2 }, /* level 10 */
3917  { 21, 21, 22, 4, 5, 16, ZSTD_lazy2 }, /* level 11 */
3918  { 22, 20, 22, 5, 5, 16, ZSTD_lazy2 }, /* level 12 */
3919  { 22, 21, 22, 4, 5, 32, ZSTD_btlazy2 }, /* level 13 */
3920  { 22, 21, 22, 5, 5, 32, ZSTD_btlazy2 }, /* level 14 */
3921  { 22, 22, 22, 6, 5, 32, ZSTD_btlazy2 }, /* level 15 */
3922  { 22, 21, 22, 4, 5, 48, ZSTD_btopt }, /* level 16 */
3923  { 23, 22, 22, 4, 4, 64, ZSTD_btopt }, /* level 17 */
3924  { 23, 23, 22, 6, 3,256, ZSTD_btopt }, /* level 18 */
3925  { 23, 24, 22, 7, 3,256, ZSTD_btultra }, /* level 19 */
3926  { 25, 25, 23, 7, 3,256, ZSTD_btultra }, /* level 20 */
3927  { 26, 26, 24, 7, 3,512, ZSTD_btultra }, /* level 21 */
3928  { 27, 27, 25, 9, 3,999, ZSTD_btultra }, /* level 22 */
3929 },
3930 { /* for srcSize <= 256 KB */
3931  /* W, C, H, S, L, T, strat */
3932  { 18, 12, 13, 1, 5, 1, ZSTD_fast }, /* base for negative levels */
3933  { 18, 13, 14, 1, 6, 0, ZSTD_fast }, /* level 1 */
3934  { 18, 14, 14, 1, 5, 1, ZSTD_dfast }, /* level 2 */
3935  { 18, 16, 16, 1, 4, 1, ZSTD_dfast }, /* level 3 */
3936  { 18, 16, 17, 2, 5, 2, ZSTD_greedy }, /* level 4.*/
3937  { 18, 18, 18, 3, 5, 2, ZSTD_greedy }, /* level 5.*/
3938  { 18, 18, 19, 3, 5, 4, ZSTD_lazy }, /* level 6.*/
3939  { 18, 18, 19, 4, 4, 4, ZSTD_lazy }, /* level 7 */
3940  { 18, 18, 19, 4, 4, 8, ZSTD_lazy2 }, /* level 8 */
3941  { 18, 18, 19, 5, 4, 8, ZSTD_lazy2 }, /* level 9 */
3942  { 18, 18, 19, 6, 4, 8, ZSTD_lazy2 }, /* level 10 */
3943  { 18, 18, 19, 5, 4, 16, ZSTD_btlazy2 }, /* level 11.*/
3944  { 18, 19, 19, 6, 4, 16, ZSTD_btlazy2 }, /* level 12.*/
3945  { 18, 19, 19, 8, 4, 16, ZSTD_btlazy2 }, /* level 13 */
3946  { 18, 18, 19, 4, 4, 24, ZSTD_btopt }, /* level 14.*/
3947  { 18, 18, 19, 4, 3, 24, ZSTD_btopt }, /* level 15.*/
3948  { 18, 19, 19, 6, 3, 64, ZSTD_btopt }, /* level 16.*/
3949  { 18, 19, 19, 8, 3,128, ZSTD_btopt }, /* level 17.*/
3950  { 18, 19, 19, 10, 3,256, ZSTD_btopt }, /* level 18.*/
3951  { 18, 19, 19, 10, 3,256, ZSTD_btultra }, /* level 19.*/
3952  { 18, 19, 19, 11, 3,512, ZSTD_btultra }, /* level 20.*/
3953  { 18, 19, 19, 12, 3,512, ZSTD_btultra }, /* level 21.*/
3954  { 18, 19, 19, 13, 3,999, ZSTD_btultra }, /* level 22.*/
3955 },
3956 { /* for srcSize <= 128 KB */
3957  /* W, C, H, S, L, T, strat */
3958  { 17, 12, 12, 1, 5, 1, ZSTD_fast }, /* base for negative levels */
3959  { 17, 12, 13, 1, 6, 0, ZSTD_fast }, /* level 1 */
3960  { 17, 13, 15, 1, 5, 0, ZSTD_fast }, /* level 2 */
3961  { 17, 15, 16, 2, 5, 1, ZSTD_dfast }, /* level 3 */
3962  { 17, 17, 17, 2, 4, 1, ZSTD_dfast }, /* level 4 */
3963  { 17, 16, 17, 3, 4, 2, ZSTD_greedy }, /* level 5 */
3964  { 17, 17, 17, 3, 4, 4, ZSTD_lazy }, /* level 6 */
3965  { 17, 17, 17, 3, 4, 8, ZSTD_lazy2 }, /* level 7 */
3966  { 17, 17, 17, 4, 4, 8, ZSTD_lazy2 }, /* level 8 */
3967  { 17, 17, 17, 5, 4, 8, ZSTD_lazy2 }, /* level 9 */
3968  { 17, 17, 17, 6, 4, 8, ZSTD_lazy2 }, /* level 10 */
3969  { 17, 17, 17, 7, 4, 8, ZSTD_lazy2 }, /* level 11 */
3970  { 17, 18, 17, 6, 4, 16, ZSTD_btlazy2 }, /* level 12 */
3971  { 17, 18, 17, 8, 4, 16, ZSTD_btlazy2 }, /* level 13.*/
3972  { 17, 18, 17, 4, 4, 32, ZSTD_btopt }, /* level 14.*/
3973  { 17, 18, 17, 6, 3, 64, ZSTD_btopt }, /* level 15.*/
3974  { 17, 18, 17, 7, 3,128, ZSTD_btopt }, /* level 16.*/
3975  { 17, 18, 17, 7, 3,256, ZSTD_btopt }, /* level 17.*/
3976  { 17, 18, 17, 8, 3,256, ZSTD_btopt }, /* level 18.*/
3977  { 17, 18, 17, 8, 3,256, ZSTD_btultra }, /* level 19.*/
3978  { 17, 18, 17, 9, 3,256, ZSTD_btultra }, /* level 20.*/
3979  { 17, 18, 17, 10, 3,256, ZSTD_btultra }, /* level 21.*/
3980  { 17, 18, 17, 11, 3,512, ZSTD_btultra }, /* level 22.*/
3981 },
3982 { /* for srcSize <= 16 KB */
3983  /* W, C, H, S, L, T, strat */
3984  { 14, 12, 13, 1, 5, 1, ZSTD_fast }, /* base for negative levels */
3985  { 14, 14, 15, 1, 5, 0, ZSTD_fast }, /* level 1 */
3986  { 14, 14, 15, 1, 4, 0, ZSTD_fast }, /* level 2 */
3987  { 14, 14, 14, 2, 4, 1, ZSTD_dfast }, /* level 3.*/
3988  { 14, 14, 14, 4, 4, 2, ZSTD_greedy }, /* level 4.*/
3989  { 14, 14, 14, 3, 4, 4, ZSTD_lazy }, /* level 5.*/
3990  { 14, 14, 14, 4, 4, 8, ZSTD_lazy2 }, /* level 6 */
3991  { 14, 14, 14, 6, 4, 8, ZSTD_lazy2 }, /* level 7 */
3992  { 14, 14, 14, 8, 4, 8, ZSTD_lazy2 }, /* level 8.*/
3993  { 14, 15, 14, 5, 4, 8, ZSTD_btlazy2 }, /* level 9.*/
3994  { 14, 15, 14, 9, 4, 8, ZSTD_btlazy2 }, /* level 10.*/
3995  { 14, 15, 14, 3, 4, 12, ZSTD_btopt }, /* level 11.*/
3996  { 14, 15, 14, 6, 3, 16, ZSTD_btopt }, /* level 12.*/
3997  { 14, 15, 14, 6, 3, 24, ZSTD_btopt }, /* level 13.*/
3998  { 14, 15, 15, 6, 3, 48, ZSTD_btopt }, /* level 14.*/
3999  { 14, 15, 15, 6, 3, 64, ZSTD_btopt }, /* level 15.*/
4000  { 14, 15, 15, 6, 3, 96, ZSTD_btopt }, /* level 16.*/
4001  { 14, 15, 15, 6, 3,128, ZSTD_btopt }, /* level 17.*/
4002  { 14, 15, 15, 8, 3,256, ZSTD_btopt }, /* level 18.*/
4003  { 14, 15, 15, 6, 3,256, ZSTD_btultra }, /* level 19.*/
4004  { 14, 15, 15, 8, 3,256, ZSTD_btultra }, /* level 20.*/
4005  { 14, 15, 15, 9, 3,256, ZSTD_btultra }, /* level 21.*/
4006  { 14, 15, 15, 10, 3,512, ZSTD_btultra }, /* level 22.*/
4007 },
4008 };
4009 
4013 ZSTD_compressionParameters ZSTD_getCParams(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize)
4014 {
4015  size_t const addedSize = srcSizeHint ? 0 : 500;
4016  U64 const rSize = srcSizeHint+dictSize ? srcSizeHint+dictSize+addedSize : (U64)-1;
4017  U32 const tableID = (rSize <= 256 KB) + (rSize <= 128 KB) + (rSize <= 16 KB); /* intentional underflow for srcSizeHint == 0 */
4018  int row = compressionLevel;
4019  DEBUGLOG(5, "ZSTD_getCParams (cLevel=%i)", compressionLevel);
4020  if (compressionLevel == 0) row = ZSTD_CLEVEL_DEFAULT; /* 0 == default */
4021  if (compressionLevel < 0) row = 0; /* entry 0 is baseline for fast mode */
4022  if (compressionLevel > ZSTD_MAX_CLEVEL) row = ZSTD_MAX_CLEVEL;
4023  { ZSTD_compressionParameters cp = ZSTD_defaultCParameters[tableID][row];
4024  if (compressionLevel < 0) cp.targetLength = (unsigned)(-compressionLevel); /* acceleration factor */
4025  return ZSTD_adjustCParams_internal(cp, srcSizeHint, dictSize); }
4026 
4027 }
4028 
4032 ZSTD_parameters ZSTD_getParams(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize) {
4033  ZSTD_parameters params;
4034  ZSTD_compressionParameters const cParams = ZSTD_getCParams(compressionLevel, srcSizeHint, dictSize);
4035  DEBUGLOG(5, "ZSTD_getParams (cLevel=%i)", compressionLevel);
4036  memset(&params, 0, sizeof(params));
4037  params.cParams = cParams;
4038  params.fParams.contentSizeFlag = 1;
4039  return params;
4040 }
ZSTD_reduceTable_internal
FORCE_INLINE_TEMPLATE void ZSTD_reduceTable_internal(U32 *const table, U32 const size, U32 const reducerValue, int const preserveMark)
Definition: zstd_compress.c:1545
u
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble * u
Definition: glfuncs.h:240
ZSTD_initCStream_srcSize
size_t ZSTD_initCStream_srcSize(ZSTD_CStream *zcs, int compressionLevel, unsigned long long pss)
Definition: zstd_compress.c:3600
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Definition: zstd_internal.h:156
ZSTD_hufCTables_t
Definition: zstd_compress_internal.h:63
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Definition: vj.h:105
ZSTD_CCtx_s::workSpaceOversizedDuration
int workSpaceOversizedDuration
Definition: zstd_compress_internal.h:218
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FSE_PUBLIC_API unsigned FSE_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue)
Definition: fse_compress.c:371
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Definition: zstd_compress_internal.h:49
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Definition: zstd_compress_internal.h:223
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Definition: mem.h:251
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Definition: zstd_internal.h:92
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Definition: zstd_compress.c:1073
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rawSeqStore_t externSeqStore
Definition: zstd_compress_internal.h:233
ZSTD_compressSequences
MEM_STATIC size_t ZSTD_compressSequences(seqStore_t *seqStorePtr, const ZSTD_entropyCTables_t *prevEntropy, ZSTD_entropyCTables_t *nextEntropy, const ZSTD_CCtx_params *cctxParams, void *dst, size_t dstCapacity, size_t srcSize, U32 *workspace, int bmi2)
Definition: zstd_compress.c:2334
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size_t HUF_compress1X_repeat(void *dst, size_t dstSize, const void *src, size_t srcSize, unsigned maxSymbolValue, unsigned huffLog, void *workSpace, size_t wkspSize, HUF_CElt *hufTable, HUF_repeat *repeat, int preferRepeat, int bmi2)
Definition: huf_compress.c:749
FSE_buildCTable_wksp
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Definition: fse_compress.c:89
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Definition: zstd_internal.h:92
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Definition: zstd_compress_internal.h:48
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Definition: zstd_compress.c:1046
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Definition: zstd_compress_internal.h:220
ZSTD_equivalentParams
static U32 ZSTD_equivalentParams(ZSTD_CCtx_params params1, ZSTD_CCtx_params params2, size_t buffSize1, size_t maxNbSeq1, size_t maxNbLit1, ZSTD_buffered_policy_e buffPol2, U64 pledgedSrcSize)
Definition: zstd_compress.c:994
ZSTD_referenceExternalSequences
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Definition: zstd_compress.c:2652
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Definition: gl.h:1546
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Definition: zstd_compress_internal.h:241
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Definition: fse_compress.c:467
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static int ZSTD_shouldAttachDict(const ZSTD_CDict *cdict, ZSTD_CCtx_params params, U64 pledgedSrcSize)
Definition: zstd_compress.c:1321
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Definition: zstd_compress.c:2643
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ZSTD_CCtx * ZSTD_createCCtx(void)
Definition: zstd_compress.c:53
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Definition: input.c:1756
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Definition: huf_compress.c:65
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Definition: zstd_compress.c:2830
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Definition: zstd_compress.c:3874
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