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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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doc/zstd_manual.html
+7 -4
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@@ -474,7 +474,9 @@ size_t ZSTD_estimateDDictSize(size_t dictSize);
<h3>New experimental advanced parameters API</h3><pre></pre><b><pre></pre></b><BR>
<pre><b>typedef enum {
</b>/* compression parameters */<b>
ZSTD_p_compressionLevel=100, </b>/* Update all compression parameters according to pre-defined cLevel table (default:3) */<b>
ZSTD_p_compressionLevel=100, </b>/* Update all compression parameters according to pre-defined cLevel table<b>
* Default level is 3.
* Special: value 0 means "do not change cLevel". */
ZSTD_p_windowLog, </b>/* Maximum allowed back-reference distance, expressed as power of 2.<b>
* Must be clamped between ZSTD_WINDOWLOG_MIN and ZSTD_WINDOWLOG_MAX.
* default value : set through compressionLevel */
@@ -491,7 +493,7 @@ size_t ZSTD_estimateDDictSize(size_t dictSize);
* More attempts result in better and slower compression.
* This parameter is useless when using "fast" and "dFast" strategies */
ZSTD_p_minMatchLength, </b>/* Minimum match size (except for repeat-matches, which limit is hard-coded).<b>
* 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. */
@@ -499,7 +501,7 @@ size_t ZSTD_estimateDDictSize(size_t dictSize);
* Length of Match considered "good enough" to stop search.
* Larger values make compression stronger and slower. */
ZSTD_p_compressionStrategy, </b>/* See ZSTD_strategy enum definition.<b>
* 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
@@ -622,7 +624,8 @@ size_t ZSTD_CDict_loadDictionary(ZSTD_CDict* cdict, const void* dict, size_t dic
</p></pre><BR>
<pre><b>size_t ZSTD_CCtx_reset(ZSTD_CCtx* cctx);
<pre><b>// Not ready yet !!!
size_t ZSTD_CCtx_reset(ZSTD_CCtx* cctx);
</b><p> Return a CCtx to clean state.
Useful after an error, or to interrupt an ongoing compression job and start a new one.
It's allowed to change compression parameters after a reset.