facebook
/
zstd
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Changed ZSTD_compressBound() 

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
dev
Yann Collet 2017-03-31 17:11:38 -07:00
parent 7b70a1969e
commit 3f75d52527
1 changed files with 4 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
lib/compress/zstd_compress.c
View File

@ -32,7 +32,10 @@ typedef enum { ZSTDcs_created=0, ZSTDcs_init, ZSTDcs_ongoing, ZSTDcs_ending } ZS
* Helper functions
***************************************/
#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;
}
/*-*************************************