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added ZSTD_CCtx_setParameter()

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Yann Collet
2017-05-12 15:31:53 -07:00
parent ef738c1b23
commit b0edb7fb0e
3 changed files with 138 additions and 13 deletions
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lib/zstd.h
+5 -3
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@@ -588,7 +588,9 @@ ZSTDLIB_API size_t ZSTD_compress_usingCDict_advanced(ZSTD_CCtx* cctx,
typedef enum {
/* compression parameters */
ZSTD_p_compressionLevel=100, /* Update all compression parameters according to pre-defined cLevel table (default:3) */
ZSTD_p_compressionLevel=100, /* Update all compression parameters according to pre-defined cLevel table
* Default level is 3.
* Special: value 0 means "do not change cLevel". */
ZSTD_p_windowLog, /* Maximum allowed back-reference distance, expressed as power of 2.
* Must be clamped between ZSTD_WINDOWLOG_MIN and ZSTD_WINDOWLOG_MAX.
* default value : set through compressionLevel */
@@ -605,7 +607,7 @@ typedef enum {
* More attempts result in better and slower compression.
* This parameter is useless when using "fast" and "dFast" strategies */
ZSTD_p_minMatchLength, /* Minimum match size (except for repeat-matches, which limit is hard-coded).
* Larger values make compression and decompression faster, but decrease compression ratio
* Larger values make faster compression and decompression, but decrease ratio.
* Must be clamped between ZSTD_SEARCHLENGTH_MIN and ZSTD_SEARCHLENGTH_MAX.
* Note that currently, for all strategies < btopt, effective minimum is 4.
* Note that currently, for all strategies > fast, effective maximum is 6. */
@@ -613,7 +615,7 @@ typedef enum {
* Length of Match considered "good enough" to stop search.
* Larger values make compression stronger and slower. */
ZSTD_p_compressionStrategy, /* See ZSTD_strategy enum definition.
* Cast selected strategy into unsigned for ZSTD_CCtx_setParameter() compatibility.
* Cast selected strategy as unsigned for ZSTD_CCtx_setParameter() compatibility.
* The higher the value of selected strategy, the more complex it is,
* resulting in stronger and slower compression */
#if 0