ddidderr/zstd-rs
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lazy strategy

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This commit is contained in:
Yann Collet
2015-10-31 12:57:14 +01:00
parent 092a4f123e
commit be2010ea1b
6 changed files with 165 additions and 42 deletions
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lib/zstdhc_static.h
+29 -27
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@@ -45,6 +45,7 @@ extern "C" {
/* *************************************
* Types
***************************************/
typedef enum { ZSTD_HC_greedy, ZSTD_HC_lazy } ZSTD_HC_strategy;
typedef struct
{
U32 windowLog; /* largest match distance : impact decompression buffer size */
@@ -52,6 +53,7 @@ typedef struct
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 */
ZSTD_HC_strategy strategy; /* greedy, lazy (stronger, slower) */
} ZSTD_HC_parameters;
/* parameters boundaries */
@@ -92,33 +94,33 @@ size_t ZSTD_HC_compressEnd(ZSTD_HC_CCtx* ctx, void* dst, size_t maxDstSize);
#define ZSTD_HC_MAX_CLEVEL 26
static const ZSTD_HC_parameters ZSTD_HC_defaultParameters[ZSTD_HC_MAX_CLEVEL+1] = {
/* W, C, H, S */
{ 18, 12, 14, 1, 4 }, /* level 0 - never used */
{ 18, 12, 14, 1, 4 }, /* level 1 - in fact redirected towards zstd fast */
{ 18, 12, 15, 2, 4 }, /* level 2 */
{ 19, 14, 16, 3, 4 }, /* level 3 */
{ 20, 15, 17, 4, 5 }, /* level 4 */
{ 20, 17, 19, 4, 5 }, /* level 5 */
{ 20, 19, 19, 4, 5 }, /* level 6 */
{ 20, 19, 19, 5, 5 }, /* level 7 */
{ 20, 20, 20, 5, 5 }, /* level 8 */
{ 20, 20, 20, 6, 5 }, /* level 9 */
{ 21, 21, 20, 5, 5 }, /* level 10 */
{ 22, 21, 22, 6, 5 }, /* level 11 */
{ 23, 21, 22, 6, 5 }, /* level 12 */
{ 23, 21, 22, 7, 5 }, /* level 13 */
{ 22, 22, 23, 7, 5 }, /* level 14 */
{ 22, 22, 23, 7, 5 }, /* level 15 */
{ 22, 22, 23, 8, 5 }, /* level 16 */
{ 22, 22, 23, 8, 5 }, /* level 17 */
{ 22, 22, 23, 9, 5 }, /* level 18 */
{ 22, 22, 23, 9, 5 }, /* level 19 */
{ 23, 23, 23, 9, 5 }, /* level 20 */
{ 23, 23, 23, 9, 5 }, /* level 21 */
{ 23, 23, 23, 10, 5 }, /* level 22 */
{ 23, 23, 23, 10, 5 }, /* level 23 */
{ 23, 23, 23, 11, 5 }, /* level 24 */
{ 23, 23, 23, 12, 5 }, /* level 25 */
{ 23, 23, 23, 13, 5 }, /* level 26 */ /* ZSTD_HC_MAX_CLEVEL */
{ 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, 15, 2, 4, ZSTD_HC_greedy }, /* level 2 */
{ 19, 13, 17, 3, 5, ZSTD_HC_greedy }, /* level 3 */
{ 20, 18, 19, 2, 5, ZSTD_HC_greedy }, /* level 4 */
{ 20, 19, 19, 3, 5, ZSTD_HC_greedy }, /* level 5 */
{ 20, 19, 19, 4, 5, ZSTD_HC_greedy }, /* level 6 */
{ 20, 19, 19, 5, 5, ZSTD_HC_greedy }, /* level 7 */
{ 20, 20, 20, 5, 5, ZSTD_HC_greedy }, /* level 8 */
{ 20, 20, 20, 6, 5, ZSTD_HC_greedy }, /* level 9 */
{ 21, 20, 21, 6, 5, ZSTD_HC_greedy }, /* level 10 */
{ 22, 21, 22, 6, 5, ZSTD_HC_greedy }, /* level 11 */
{ 23, 21, 22, 6, 5, ZSTD_HC_greedy }, /* level 12 */
{ 22, 22, 22, 6, 5, ZSTD_HC_greedy }, /* level 13 */
{ 22, 22, 23, 7, 5, ZSTD_HC_greedy }, /* level 14 */
{ 22, 22, 23, 7, 5, ZSTD_HC_greedy }, /* level 15 */
{ 22, 22, 23, 8, 5, ZSTD_HC_greedy }, /* level 16 */
{ 22, 22, 23, 8, 5, ZSTD_HC_greedy }, /* level 17 */
{ 22, 22, 23, 9, 5, ZSTD_HC_greedy }, /* level 18 */
{ 22, 22, 23, 10, 5, ZSTD_HC_greedy }, /* level 19 */
{ 23, 23, 23, 9, 5, ZSTD_HC_greedy }, /* level 20 */
{ 23, 23, 23, 9, 5, ZSTD_HC_greedy }, /* level 21 */
{ 23, 23, 23, 10, 5, ZSTD_HC_greedy }, /* level 22 */
{ 23, 23, 23, 11, 5, ZSTD_HC_greedy }, /* level 23 */
{ 23, 23, 23, 11, 5, ZSTD_HC_greedy }, /* level 24 */
{ 24, 24, 23, 11, 5, ZSTD_HC_greedy }, /* level 25 */
{ 24, 24, 24, 12, 5, ZSTD_HC_greedy }, /* level 26 */ /* ZSTD_HC_MAX_CLEVEL */
};
#if defined (__cplusplus)