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added ZSTD_COMPRESSBOUND() as a macro

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ZSTD_compressBound() works fine, but is only useful for dynamic allocation.
For static allocation, only a macro can provide the amount during compilation time.
This commit is contained in:
Yann Collet 2017-09-29 23:17:41 -07:00
parent e580dc6a4a
commit 5b10345b26
2 changed files with 3 additions and 4 deletions
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4
lib/compress/zstd_compress.c
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@ -38,9 +38,7 @@
* Helper functions * Helper functions
***************************************/ ***************************************/
size_t ZSTD_compressBound(size_t srcSize) { size_t ZSTD_compressBound(size_t srcSize) {
size_t const lowLimit = 256 KB; return ZSTD_COMPRESSBOUND(srcSize);
size_t const margin = (srcSize < lowLimit) ? (lowLimit-srcSize) >> 12 : 0; /* from 64 to 0 */
return srcSize + (srcSize >> 8) + margin;
} }

3
lib/zstd.h
View File

@ -131,10 +131,11 @@ ZSTDLIB_API unsigned long long ZSTD_getDecompressedSize(const void* src, size_t
/*====== Helper functions ======*/ /*====== Helper functions ======*/
ZSTDLIB_API int ZSTD_maxCLevel(void); /*!< maximum compression level available */ #define ZSTD_COMPRESSBOUND(srcSize) ((srcSize) + ((srcSize)>>9) + (((srcSize) < 128 KB) ? ((128 KB - (srcSize)) >> 11) /* margin, from 64 to 0 */ : 0))
ZSTDLIB_API size_t ZSTD_compressBound(size_t srcSize); /*!< maximum compressed size in worst case scenario */ ZSTDLIB_API size_t ZSTD_compressBound(size_t srcSize); /*!< maximum compressed size in worst case scenario */
ZSTDLIB_API unsigned ZSTD_isError(size_t code); /*!< tells if a `size_t` function result is an error code */ ZSTDLIB_API unsigned ZSTD_isError(size_t code); /*!< tells if a `size_t` function result is an error code */
ZSTDLIB_API const char* ZSTD_getErrorName(size_t code); /*!< provides readable string from an error code */ ZSTDLIB_API const char* ZSTD_getErrorName(size_t code); /*!< provides readable string from an error code */
ZSTDLIB_API int ZSTD_maxCLevel(void); /*!< maximum compression level available */
/*************************************** /***************************************