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Add ldmBucketSizeLog param

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Stella Lau
2017-09-02 21:55:29 -07:00
parent a1f04d518d
commit 67d4a6161c
9 changed files with 116 additions and 47 deletions
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lib/zstd.h
+16 -12
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@@ -392,6 +392,7 @@ ZSTDLIB_API size_t ZSTD_DStreamOutSize(void); /*!< recommended size for output
#define ZSTD_TARGETLENGTH_MAX 999
#define ZSTD_LDM_SEARCHLENGTH_MIN 4
#define ZSTD_LDM_SEARCHLENGTH_MAX 4096
#define ZSTD_LDM_BUCKETSIZELOG_MAX 8
#define ZSTD_FRAMEHEADERSIZE_MAX 18 /* for static allocation */
#define ZSTD_FRAMEHEADERSIZE_MIN 6
@@ -978,22 +979,25 @@ typedef enum {
/* advanced parameters - may not remain available after API update */
ZSTD_p_forceMaxWindow=1100, /* Force back-reference distances to remain < windowSize,
* even when referencing into Dictionary content (default:0) */
ZSTD_p_longDistanceMatching, /* Enable long distance matching. This
* increases the memory usage as well as the
* window size. Note: this should be set after
* ZSTD_p_compressionLevel and before
* ZSTD_p_windowLog and other LDM parameters. */
ZSTD_p_enableLongDistanceMatching, /* Enable long distance matching. This increases the memory
* usage as well as window size. Note: setting this
* parameter resets all the LDM parameters as well as
* ZSTD_p_windowLog. It should be set after
* ZSTD_p_compressionLevel and before ZSTD_p_windowLog and
* other LDM parameters. Setting the compression level
* after this parameter overrides the window log, though LDM
* will remain enabled until explicitly disabled. */
ZSTD_p_ldmHashLog, /* Size of the table for long distance matching.
* Must be clamped between ZSTD_HASHLOG_MIN and
* ZSTD_HASHLOG_MAX */
* Must be clamped between ZSTD_HASHLOG_MIN and ZSTD_HASHLOG_MAX. */
ZSTD_p_ldmMinMatch, /* Minimum size of searched matches for long distance matcher.
* Must be clamped between ZSTD_LDM_SEARCHLENGTH_MIN
* and ZSTD_LDM_SEARCHLENGTH_MAX. */
ZSTD_p_ldmHashEveryLog, /* Frequency of inserting/looking up entries in the
* LDM hash table. The default is
* (windowLog - ldmHashLog) to optimize hash table
* usage. Must be clamped between 0 and
* ZSTD_WINDOWLOG_MAX - ZSTD_HASHLOG_MIN. */
ZSTD_p_ldmBucketSizeLog, /* Log size of each bucket in the hash table for collision resolution.
* The maximum value is ZSTD_LDM_BUCKETSIZELOG_MAX. */
ZSTD_p_ldmHashEveryLog, /* Frequency of inserting/looking up entries in the LDM hash table.
* The default is MAX(0, (windowLog - ldmHashLog)) to
* optimize hash table usage.
* Must be clamped between 0 and ZSTD_WINDOWLOG_MAX - ZSTD_HASHLOG_MIN. */
} ZSTD_cParameter;