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added ZSTD_createDDict_byReference() body

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This commit is contained in:
Yann Collet 2016-12-21 19:25:15 +01:00
parent 4e5eea61a8
commit 0819abe3c1
3 changed files with 20 additions and 8 deletions
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2
lib/common/mem.h
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@ -39,7 +39,7 @@ extern "C" {
#endif
/* code only tested on 32 and 64 bits systems */
#define MEM_STATIC_ASSERT(c) { enum { XXH_static_assert = 1/(int)(!!(c)) }; }
#define MEM_STATIC_ASSERT(c) { enum { MEM_static_assert = 1/(int)(!!(c)) }; }
MEM_STATIC void MEM_check(void) { MEM_STATIC_ASSERT((sizeof(size_t)==4) || (sizeof(size_t)==8)); }

12
lib/decompress/zstd_decompress.c
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@ -1766,6 +1766,18 @@ ZSTD_DDict* ZSTD_createDDict(const void* dict, size_t dictSize)
return ZSTD_createDDict_advanced(dict, dictSize, 0, allocator);
}
/*! ZSTD_createDDict_byReference() :
* Create a digested dictionary, ready to start decompression operation without startup delay.
* Dictionary content is simply referenced, and therefore stays in dictBuffer.
* It is important that dictBuffer outlives DDict, it must remain read accessible throughout the lifetime of DDict */
ZSTD_DDict* ZSTD_createDDict_byReference(const void* dictBuffer, size_t dictSize)
{
ZSTD_customMem const allocator = { NULL, NULL, NULL };
return ZSTD_createDDict_advanced(dictBuffer, dictSize, 1, allocator);
}
size_t ZSTD_freeDDict(ZSTD_DDict* ddict)
{
if (ddict==NULL) return 0; /* support free on NULL */

14
lib/dictBuilder/zdict.c
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@ -306,13 +306,13 @@ static dictItem ZDICT_analyzePos(
} while (length >=MINMATCHLENGTH);
/* look backward */
length = MINMATCHLENGTH;
while ((length >= MINMATCHLENGTH) & (start > 0)) {
length = ZDICT_count(b + pos, b + suffix[start - 1]);
if (length >= LLIMIT) length = LLIMIT - 1;
lengthList[length]++;
if (length >= MINMATCHLENGTH) start--;
}
length = MINMATCHLENGTH;
while ((length >= MINMATCHLENGTH) & (start > 0)) {
length = ZDICT_count(b + pos, b + suffix[start - 1]);
if (length >= LLIMIT) length = LLIMIT - 1;
lengthList[length]++;
if (length >= MINMATCHLENGTH) start--;
}
/* largest useful length */
memset(cumulLength, 0, sizeof(cumulLength));