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completed implementation of ZSTD_cParam_getBounds()

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for all parameters
This commit is contained in:
Yann Collet
2018-11-20 16:06:00 -08:00
parent 2e7fd6a2cb
commit 5c6d4b18ac
5 changed files with 99 additions and 36 deletions
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lib/zstd.h
+23 -8
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@@ -553,7 +553,7 @@ typedef enum {
* Special: value 0 means "use default value" (default: 64). */
ZSTD_p_ldmBucketSizeLog=163, /* Log size of each bucket in the LDM hash table for collision resolution.
* Larger values improve collision resolution but decrease compression speed.
* The maximum value is ZSTD_LDM_BUCKETSIZELOG_MAX .
* The maximum value is ZSTD_LDM_BUCKETSIZELOG_MAX.
* Special: value 0 means "use default value" (default: 3). */
ZSTD_p_ldmHashEveryLog=164, /* Frequency of inserting/looking up entries into the LDM hash table.
* Must be clamped between 0 and (ZSTD_WINDOWLOG_MAX - ZSTD_HASHLOG_MIN).
@@ -584,8 +584,13 @@ typedef enum {
* 0 means default, which is dynamically determined based on compression parameters.
* Job size must be a minimum of overlapSize, or 1 MB, whichever is largest.
* The minimum size is automatically and transparently enforced */
ZSTD_p_overlapSizeLog=402, /* Size of previous input reloaded at the beginning of each job, as a fraction of window size.
* 0 : no overlap; 6(default) : use 1/8th of windowSize; >=9 : use full windowSize */
ZSTD_p_overlapSizeLog=402, /* Size of previous job reloaded at the beginning of each job, as a fraction of window size.
* This value is enforced only when nbWorkers >= 1.
* Larger values increase compression ratio, but decrease speed.
* Values range from 0 (no overlap) to 9 (overlap a full windowSize).
* Each rank (except 0) increase/decrease load size by a factor 2
* 9: full window; 8: w/2; 7: w/4; 6: w/8; 5:w/16; 4: w/32; 3:w/64; 2:w/128; 1:w/256;
* default value is 6 : use 1/8th of windowSize */
/* =================================================================== */
/* experimental parameters - no stability guaranteed */
@@ -886,8 +891,6 @@ ZSTDLIB_API size_t ZSTD_decompress_generic(ZSTD_DCtx* dctx,
#define ZSTD_FRAMEHEADERSIZE_MAX 18 /* can be useful for static allocation */
#define ZSTD_SKIPPABLEHEADERSIZE 8
#define ZSTD_HASHLOG3_MAX 17
/* note : matches --ultra and --long default (27) ? */
#define ZSTD_WINDOWLOG_LIMIT_DEFAULT 27 /* by default, the streaming decoder will refuse any frame
* requiring larger than (1<<ZSTD_WINDOWLOG_LIMIT_DEFAULT) window size, to preserve memory.
@@ -912,10 +915,22 @@ ZSTDLIB_API size_t ZSTD_decompress_generic(ZSTD_DCtx* dctx,
#define ZSTD_TARGETLENGTH_MAX ZSTD_BLOCKSIZE_MAX
#define ZSTD_TARGETLENGTH_MIN 0 /* note : comparing this constant to an unsigned results in a tautological test */
#define ZSTD_OVERLAPLOG_MIN 0
#define ZSTD_OVERLAPLOG_MAX 9
/* LDM parameter bounds */
#define ZSTD_LDM_MINMATCH_MAX 4096
#define ZSTD_LDM_MINMATCH_MIN 4
#define ZSTD_LDM_BUCKETSIZELOG_MAX 8
#define ZSTD_LDM_HASHLOG_MIN ZSTD_HASHLOG_MIN
#define ZSTD_LDM_HASHLOG_MAX ZSTD_HASHLOG_MAX
#define ZSTD_LDM_MINMATCH_MIN 4
#define ZSTD_LDM_MINMATCH_MAX 4096
#define ZSTD_LDM_BUCKETSIZELOG_MIN 1
#define ZSTD_LDM_BUCKETSIZELOG_MAX 8
#define ZSTD_LDM_HASHEVERYLOG_MIN 0
#define ZSTD_LDM_HASHEVERYLOG_MAX (ZSTD_WINDOWLOG_MAX - ZSTD_HASHLOG_MIN)
/* internal */
#define ZSTD_HASHLOG3_MAX 17
/* --- Advanced types --- */