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ZSTD_estimateCCtx_advanced()

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ZSTD_estimateCCtx() is now a "simple" function,
taking int compressionLevel as single argument.

ZSTD_estimateCCtx_advanced() takes a CParams argument,
which is both more complete and more complex to generate.
This commit is contained in:
Yann Collet
2017-06-26 15:52:39 -07:00
parent 379f9d874d
commit 31af8290d1
4 changed files with 31 additions and 13 deletions
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lib/zstd.h
+6 -3
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@@ -495,11 +495,14 @@ ZSTDLIB_API size_t ZSTD_sizeof_DDict(const ZSTD_DDict* ddict);
/*! ZSTD_estimate*() :
* These functions make it possible to estimate memory usage
* of a future target object, before its allocation,
* given a set of parameters, which vary depending on target object.
* of a future {D,C}Ctx, before its creation.
* The objective is to guide decision before allocation.
* ZSTD_estimateCCtxSize() will consider src size to be arbitrarily "large".
* If srcSize is known to be small, ZSTD_estimateCCtxSize_advanced() will provide a better (smaller) estimation.
* ZSTD_estimateCCtxSize_advanced() can be used in tandem with ZSTD_getCParams() to create cParams from compressionLevel.
* Note : CCtx estimation is only correct for single-threaded compression */
ZSTDLIB_API size_t ZSTD_estimateCCtxSize(ZSTD_compressionParameters cParams);
ZSTDLIB_API size_t ZSTD_estimateCCtxSize(int compressionLevel);
ZSTDLIB_API size_t ZSTD_estimateCCtxSize_advanced(ZSTD_compressionParameters cParams);
ZSTDLIB_API size_t ZSTD_estimateDCtxSize(void);
/*! ZSTD_estimate?StreamSize() :