zstd/decompress/zstd_ddict.c

44 const void* ZSTD_DDict_dictContent(const ZSTD_DDict* ddict)
46     assert(ddict != NULL);
47     return ddict->dictContent;
50 size_t ZSTD_DDict_dictSize(const ZSTD_DDict* ddict)
52     assert(ddict != NULL);
53     return ddict->dictSize;
56 void ZSTD_copyDDictParameters(ZSTD_DCtx* dctx, const ZSTD_DDict* ddict)
60     assert(ddict != NULL);
61     dctx->dictID = ddict->dictID;
62     dctx->prefixStart = ddict->dictContent;
63     dctx->virtualStart = ddict->dictContent;
64     dctx->dictEnd = (const BYTE*)ddict->dictContent + ddict->dictSize;
70     if (ddict->entropyPresent) {
73         dctx->LLTptr = ddict->entropy.LLTable;
74         dctx->MLTptr = ddict->entropy.MLTable;
75         dctx->OFTptr = ddict->entropy.OFTable;
76         dctx->HUFptr = ddict->entropy.hufTable;
77         dctx->entropy.rep[0] = ddict->entropy.rep[0];
78         dctx->entropy.rep[1] = ddict->entropy.rep[1];
79         dctx->entropy.rep[2] = ddict->entropy.rep[2];
88 ZSTD_loadEntropy_intoDDict(ZSTD_DDict* ddict,
91     ddict->dictID = 0;
92     ddict->entropyPresent = 0;
95     if (ddict->dictSize < 8) {
100     {   U32 const magic = MEM_readLE32(ddict->dictContent);
107     ddict->dictID = MEM_readLE32((const char*)ddict->dictContent + ZSTD_FRAMEIDSIZE);
111             &ddict->entropy, ddict->dictContent, ddict->dictSize)),
113     ddict->entropyPresent = 1;
118 static size_t ZSTD_initDDict_internal(ZSTD_DDict* ddict,
124         ddict->dictBuffer = NULL;
125         ddict->dictContent = dict;
128         void* const internalBuffer = ZSTD_customMalloc(dictSize, ddict->cMem);
129         ddict->dictBuffer = internalBuffer;
130         ddict->dictContent = internalBuffer;
134     ddict->dictSize = dictSize;
135     ddict->entropy.hufTable[0] = (HUF_DTable)((ZSTD_HUFFDTABLE_CAPACITY_LOG)*0x1000001);  /* cover both little and big endian */
138     FORWARD_IF_ERROR( ZSTD_loadEntropy_intoDDict(ddict, dictContentType) , "");
150     {   ZSTD_DDict* const ddict = (ZSTD_DDict*) ZSTD_customMalloc(sizeof(ZSTD_DDict), customMem);
151         if (ddict == NULL) return NULL;
152         ddict->cMem = customMem;
153         {   size_t const initResult = ZSTD_initDDict_internal(ddict,
157                 ZSTD_freeDDict(ddict);
160         return ddict;
193     ZSTD_DDict* const ddict = (ZSTD_DDict*)sBuffer;
199         ZSTD_memcpy(ddict+1, dict, dictSize);  /* local copy */
200         dict = ddict+1;
202     if (ZSTD_isError( ZSTD_initDDict_internal(ddict,
206     return ddict;
210 size_t ZSTD_freeDDict(ZSTD_DDict* ddict)
212     if (ddict==NULL) return 0;   /* support free on NULL */
213     {   ZSTD_customMem const cMem = ddict->cMem;
214         ZSTD_customFree(ddict->dictBuffer, cMem);
215         ZSTD_customFree(ddict, cMem);
228 size_t ZSTD_sizeof_DDict(const ZSTD_DDict* ddict)
230     if (ddict==NULL) return 0;   /* support sizeof on NULL */
231     return sizeof(*ddict) + (ddict->dictBuffer ? ddict->dictSize : 0) ;
235  *  Provides the dictID of the dictionary loaded into `ddict`.
238 unsigned ZSTD_getDictID_fromDDict(const ZSTD_DDict* ddict)
240     if (ddict==NULL) return 0;
241     return ddict->dictID;