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Added ZSTD_initStaticCDict()

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Yann Collet
2017-05-25 18:05:49 -07:00
parent 57827f906f
commit cdf7e82222
5 changed files with 145 additions and 37 deletions
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doc/zstd_manual.html
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@ -408,8 +408,8 @@ size_t ZSTD_estimateDCtxSize(void);
<pre><b>size_t ZSTD_estimateCStreamSize(ZSTD_compressionParameters cParams);
size_t ZSTD_estimateDStreamSize(ZSTD_frameHeader fHeader);
</b><p> Note : if streaming is init with function ZSTD_init?Stream_usingDict(),
an internal ?Dict will be created, which size is not estimated.
In this case, get additional size by using ZSTD_estimate?DictSize
an internal ?Dict will be created, which size is not estimated here.
In this case, get total size by adding ZSTD_estimate?DictSize
</p></pre><BR>
<pre><b>size_t ZSTD_estimateCDictSize(ZSTD_compressionParameters cParams, size_t dictSize, unsigned byReference);
@ -460,6 +460,24 @@ size_t ZSTD_estimateDDictSize(size_t dictSize, unsigned byReference);
</b><p> Create a ZSTD_CDict using external alloc and free, and customized compression parameters
</p></pre><BR>
<pre><b>ZSTD_CDict* ZSTD_initStaticCDict(
void* workspace, size_t workspaceSize,
const void* dict, size_t dictSize, unsigned byReference,
ZSTD_compressionParameters cParams);
</b><p> Generate a digested dictionary in provided memory area.
workspace: The memory area to emplace the dictionary into.
Provided pointer must 8-bytes aligned.
It must outlive dictionary usage.
workspaceSize: Use ZSTD_estimateCDictSize()
to determine how large workspace must be.
cParams : use ZSTD_getCParams() to transform a compression level
into its relevants cParams.
@return : pointer to ZSTD_CDict*, or NULL if error (size too small)
Note : there is no corresponding "free" function.
Since workspace was allocated externally, it must be freed externally.
</p></pre><BR>
<pre><b>ZSTD_compressionParameters ZSTD_getCParams(int compressionLevel, unsigned long long estimatedSrcSize, size_t dictSize);
</b><p> @return ZSTD_compressionParameters structure for a selected compression level and estimated srcSize.
`estimatedSrcSize` value is optional, select 0 if not known