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adding dedicatedDictSearch cParams helper methods

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Bimba Shrestha 2020-06-11 13:48:57 -07:00 committed by W. Felix Handte
parent f10d4e313c
commit e36a373df4
1 changed files with 16 additions and 0 deletions
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16
lib/compress/zstd_compress.c
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@ -864,6 +864,9 @@ ZSTDLIB_API size_t ZSTD_CCtx_setPledgedSrcSize(ZSTD_CCtx* cctx, unsigned long lo
return 0;
}
static ZSTD_compressionParameters ZSTD_dedicatedDictSearch_getCParams(int const compressionLevel, size_t const dictSize);
static int ZSTD_dedicatedDictSearch_isSupported(int const compressionLevel, size_t const dictSize);
/**
* Initializes the local dict using the requested parameters.
* NOTE: This does not use the pledged src size, because it may be used for more
@ -4356,6 +4359,19 @@ ZSTD_dedicatedDictSearch_defaultCParameters[4][ZSTD_MAX_CLEVEL+1] = {
},
};
static ZSTD_compressionParameters ZSTD_dedicatedDictSearch_getCParams(int const compressionLevel, size_t const dictSize)
{
size_t const tableID = (dictSize <= 256 KB) + (dictSize <= 128 KB) + (dictSize <= 16 KB);
size_t const row = compressionLevel;
return ZSTD_dedicatedDictSearch_defaultCParameters[tableID][row];
}
static int ZSTD_dedicatedDictSearch_isSupported(int const compressionLevel, size_t const dictSize)
{
ZSTD_compressionParameters const cParams = ZSTD_dedicatedDictSearch_getCParams(compressionLevel, dictSize);
return (cParams.strategy >= ZSTD_greedy) && (cParams.strategy <= ZSTD_lazy2);
}
/*! ZSTD_getCParams_internal() :
* @return ZSTD_compressionParameters structure for a selected compression level, srcSize and dictSize.
* Note: srcSizeHint 0 means 0, use ZSTD_CONTENTSIZE_UNKNOWN for unknown.