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Code Issues Releases 1 Activity

reverted default compression level to 1

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This commit is contained in:
Yann Collet 2016-05-18 12:06:33 +02:00
parent 78aa05228a
commit 236d94fa9a
1 changed files with 5 additions and 6 deletions
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11
lib/compress/zstd_compress.c
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@ -2432,7 +2432,7 @@ size_t ZSTD_compress(void* dst, size_t dstCapacity, const void* src, size_t srcS
/*-===== Pre-defined compression levels =====-*/
#define ZSTD_DEFAULT_CLEVEL 5
#define ZSTD_DEFAULT_CLEVEL 1
#define ZSTD_MAX_CLEVEL 22
unsigned ZSTD_maxCLevel(void) { return ZSTD_MAX_CLEVEL; }
@ -2543,17 +2543,16 @@ static const ZSTD_compressionParameters ZSTD_defaultCParameters[4][ZSTD_MAX_CLEV
},
};
/*! ZSTD_getParams() :
* @return ZSTD_parameters structure for a selected compression level and srcSize.
* `srcSize` value is optional, select 0 if not known */
/*! ZSTD_getCParams() :
* @return ZSTD_compressionParameters structure for a selected compression level, `srcSize` and `dictSize`.
* Size values are optional, provide 0 if not known or unused */
ZSTD_compressionParameters ZSTD_getCParams(int compressionLevel, U64 srcSize, size_t dictSize)
{
ZSTD_compressionParameters cp;
size_t const addedSize = srcSize ? 0 : 500;
U64 const rSize = srcSize+dictSize ? srcSize+dictSize+addedSize : (U64)-1;
U32 const tableID = (rSize <= 256 KB) + (rSize <= 128 KB) + (rSize <= 16 KB); /* intentional underflow for srcSizeHint == 0 */
if (compressionLevel < 0) compressionLevel = ZSTD_DEFAULT_CLEVEL;
if (compressionLevel==0) compressionLevel = 1;
if (compressionLevel <= 0) compressionLevel = ZSTD_DEFAULT_CLEVEL; /* 0 == default; no negative compressionLevel yet */
if (compressionLevel > ZSTD_MAX_CLEVEL) compressionLevel = ZSTD_MAX_CLEVEL;
cp = ZSTD_defaultCParameters[tableID][compressionLevel];
if (MEM_32bits()) { /* auto-correction, for 32-bits mode */