ddidderr/zstd-rs
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integrate fast mode

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This commit is contained in:
Yann Collet
2015-11-05 18:16:59 +01:00
parent 1f44b3f778
commit f12c1304a8
8 changed files with 41 additions and 27 deletions
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lib/zstdhc_static.h
+7 -4
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@@ -51,7 +51,7 @@ typedef enum { ZSTD_HC_fast, ZSTD_HC_greedy, ZSTD_HC_lazy, ZSTD_HC_lazy2, ZSTD_H
typedef struct
{
U32 windowLog; /* largest match distance : impact decompression buffer size */
U32 contentLog; /* full search segment : larger == more compression, slower, more memory*/
U32 contentLog; /* full search segment : larger == more compression, slower, more memory (useless for fast) */
U32 hashLog; /* dispatch table : larger == more memory, faster*/
U32 searchLog; /* nb of searches : larger == more compression, slower*/
U32 searchLength; /* size of matches : larger == faster decompression */
@@ -98,11 +98,11 @@ size_t ZSTD_HC_compressEnd(ZSTD_HC_CCtx* ctx, void* dst, size_t maxDstSize);
/* *************************************
* Pre-defined compression levels
***************************************/
#define ZSTD_HC_MAX_CLEVEL 22
#define ZSTD_HC_MAX_CLEVEL 25
static const ZSTD_HC_parameters ZSTD_HC_defaultParameters[ZSTD_HC_MAX_CLEVEL+1] = {
/* W, C, H, S, L, strat */
{ 18, 12, 14, 1, 4, ZSTD_HC_greedy }, /* level 0 - never used */
{ 18, 12, 14, 1, 4, ZSTD_HC_greedy }, /* level 1 - in fact redirected towards zstd fast */
{ 18, 12, 14, 1, 4, ZSTD_HC_fast }, /* level 0 - never used */
{ 18, 12, 14, 1, 7, ZSTD_HC_fast }, /* level 1 - in fact redirected towards zstd fast */
{ 18, 12, 15, 2, 4, ZSTD_HC_greedy }, /* level 2 */
{ 19, 14, 18, 2, 5, ZSTD_HC_greedy }, /* level 3 */
{ 20, 17, 19, 3, 5, ZSTD_HC_greedy }, /* level 4 */
@@ -124,6 +124,9 @@ static const ZSTD_HC_parameters ZSTD_HC_defaultParameters[ZSTD_HC_MAX_CLEVEL+1]
{ 25, 25, 23, 6, 5, ZSTD_HC_btlazy2 }, /* level 20 */
{ 25, 26, 23, 8, 5, ZSTD_HC_btlazy2 }, /* level 21 */
{ 25, 26, 23, 8, 5, ZSTD_HC_btlazy2 }, /* level 22 */
{ 25, 26, 23, 8, 5, ZSTD_HC_btlazy2 }, /* level 23 */
{ 25, 26, 23, 8, 5, ZSTD_HC_btlazy2 }, /* level 24 */
{ 25, 26, 23, 8, 5, ZSTD_HC_btlazy2 }, /* level 25 */
};