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reduced memory usage of very hich compression levels in 32-bits mode

dev
Yann Collet 2016-04-04 13:28:28 +02:00
parent 1535414927
commit 1005fc1276
2 changed files with 9 additions and 5 deletions
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8
lib/zstd_compress.c
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@ -2525,7 +2525,7 @@ static const ZSTD_compressionParameters ZSTD_defaultCParameters[4][ZSTD_MAX_CLEV
ZSTD_compressionParameters ZSTD_getCParams(int compressionLevel, U64 srcSize, size_t dictSize)
{
ZSTD_compressionParameters cp;
size_t addedSize = srcSize ? 0 : 500;
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 = 1;
@ -2534,6 +2534,10 @@ ZSTD_compressionParameters ZSTD_getCParams(int compressionLevel, U64 srcSize, si
tableID=0;
#endif
cp = ZSTD_defaultCParameters[tableID][compressionLevel];
if (cp.windowLog > ZSTD_WINDOWLOG_MAX) cp.windowLog = ZSTD_WINDOWLOG_MAX; /* auto-correction, for 32-bits mode */
if (MEM_32bits()) { /* auto-correction, for 32-bits mode */
if (cp.windowLog > ZSTD_WINDOWLOG_MAX) cp.windowLog = ZSTD_WINDOWLOG_MAX;
if (cp.contentLog > ZSTD_CONTENTLOG_MAX) cp.contentLog = ZSTD_CONTENTLOG_MAX;
if (cp.hashLog > ZSTD_HASHLOG_MAX) cp.hashLog = ZSTD_HASHLOG_MAX;
}
return cp;
}

4
lib/zstd_static.h
View File

@ -61,9 +61,9 @@ extern "C" {
#define ZSTD_WINDOWLOG_MIN 18
#define ZSTD_CONTENTLOG_MAX (ZSTD_WINDOWLOG_MAX+1)
#define ZSTD_CONTENTLOG_MIN 4
#define ZSTD_HASHLOG_MAX 28
#define ZSTD_HASHLOG_MAX ZSTD_WINDOWLOG_MAX
#define ZSTD_HASHLOG_MIN 12
#define ZSTD_SEARCHLOG_MAX (ZSTD_CONTENTLOG_MAX-1)
#define ZSTD_SEARCHLOG_MAX (ZSTD_WINDOWLOG_MAX-1)
#define ZSTD_SEARCHLOG_MIN 1
#define ZSTD_SEARCHLENGTH_MAX 7
#define ZSTD_SEARCHLENGTH_MIN 3