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added parameter ZSTD_p_refDictContent

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This commit is contained in:
Yann Collet
2017-06-27 11:46:39 -07:00
parent c7fb884eea
commit fecc721fd9
4 changed files with 30 additions and 32 deletions
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lib/zstd.h
+9 -11
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@@ -956,13 +956,11 @@ typedef enum {
ZSTD_p_checksumFlag, /* A 32-bits checksum of content is written at end of frame (default:0) */
ZSTD_p_dictIDFlag, /* When applicable, dictID of dictionary is provided in frame header (default:1) */
/* dictionary parameters */
ZSTD_p_refDictContent=300, /* Content of dictionary content will be referenced, instead of copied (default:0).
* This avoids duplicating dictionary content.
* But it also requires that dictionary buffer outlives its users */
/* Not ready yet ! <=================================== */
ZSTD_p_dictMode, /* Select how dictionary must be interpreted. Value must be from type ZSTD_dictMode_e.
/* dictionary parameters (must be set before loading) */
ZSTD_p_dictMode=300, /* Select how dictionary content must be interpreted. Value must be from type ZSTD_dictMode_e.
* default : 0==auto : dictionary will be "full" if it respects specification, otherwise it will be "rawContent" */
ZSTD_p_refDictContent, /* Dictionary content will be referenced, instead of copied (default:0==byCopy).
* It requires that dictionary buffer outlives its users */
/* multi-threading parameters */
ZSTD_p_nbThreads=400, /* Select how many threads a compression job can spawn (default:1)
@@ -977,9 +975,9 @@ typedef enum {
* 0 => no overlap, 6(default) => use 1/8th of windowSize, >=9 => use full windowSize */
/* advanced parameters - may not remain available after API update */
ZSTD_p_forceMaxWindow=1100, /* Force back-references to remain < windowSize,
* even when referencing into Dictionary content.
* default : 0 when using a CDict, 1 when using a Prefix */
ZSTD_p_forceMaxWindow=1100, /* Force back-reference distances to remain < windowSize,
* even when referencing into Dictionary content (default:0) */
} ZSTD_cParameter;
@@ -1006,8 +1004,8 @@ ZSTDLIB_API size_t ZSTD_CCtx_setPledgedSrcSize(ZSTD_CCtx* cctx, unsigned long lo
* @result : 0, or an error code (which can be tested with ZSTD_isError()).
* Special : Adding a NULL (or 0-size) dictionary invalidates any previous dictionary,
* meaning "return to no-dictionary mode".
* Note 1 : Dictionary content will be copied internally,
* except if ZSTD_p_refDictContent is set.
* Note 1 : `dict` content will be copied internally,
* except if ZSTD_p_refDictContent is set before loading.
* Note 2 : Loading a dictionary involves building tables, which are dependent on compression parameters.
* For this reason, compression parameters cannot be changed anymore after loading a dictionary.
* It's also a CPU-heavy operation, with non-negligible impact on latency.