AuroraMiddleware/zstd
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Changed ZSTD_compressBound()

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required so that if Total = A+B
compressBound(Total) <= compressBound(A) + compressBound(B)
under condition of a minimum size for A and B

Will help for ZSTDMT_compress() memory allocation
This commit is contained in:
Yann Collet 2017-03-31 17:11:38 -07:00
parent 7b70a1969e
commit 3f75d52527
1 changed files with 4 additions and 1 deletions
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5
lib/compress/zstd_compress.c
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@ -32,7 +32,10 @@ typedef enum { ZSTDcs_created=0, ZSTDcs_init, ZSTDcs_ongoing, ZSTDcs_ending } ZS
* Helper functions * Helper functions
***************************************/ ***************************************/
#define ZSTD_STATIC_ASSERT(c) { enum { ZSTD_static_assert = 1/(int)(!!(c)) }; } #define ZSTD_STATIC_ASSERT(c) { enum { ZSTD_static_assert = 1/(int)(!!(c)) }; }
size_t ZSTD_compressBound(size_t srcSize) { return FSE_compressBound(srcSize) + 12; } size_t ZSTD_compressBound(size_t srcSize) {
size_t const margin = (srcSize < 512 KB) ? 16 : 0;
return srcSize + (srcSize >> 8) + margin;
}
/*-************************************* /*-*************************************