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Use new paramSwitch enum for LCM, row matchfinder, and block splitter

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senhuang42
2021-09-21 14:22:02 -04:00
parent 51b123d5f7
commit b5c35d7ea3
16 changed files with 329 additions and 324 deletions
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lib/zstd.h
+33 -20
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@@ -417,7 +417,7 @@ typedef enum {
* ZSTD_c_stableOutBuffer
* ZSTD_c_blockDelimiters
* ZSTD_c_validateSequences
* ZSTD_c_splitBlocks
* ZSTD_c_useBlockSplitter
* ZSTD_c_useRowMatchFinder
* Because they are not stable, it's necessary to define ZSTD_STATIC_LINKING_ONLY to access them.
* note : never ever use experimentalParam? names directly;
@@ -1299,10 +1299,14 @@ typedef enum {
} ZSTD_literalCompressionMode_e;
typedef enum {
ZSTD_urm_auto = 0, /* Automatically determine whether or not we use row matchfinder */
ZSTD_urm_disableRowMatchFinder = 1, /* Never use row matchfinder */
ZSTD_urm_enableRowMatchFinder = 2 /* Always use row matchfinder when applicable */
} ZSTD_useRowMatchFinderMode_e;
/* Note: This enum controls features which are conditionally beneficial. Zstd typically will make a final
* decision on whether or not to enable the feature (ZSTD_ps_auto), but setting the switch to ZSTD_ps_enable
* or ZSTD_ps_disable allow for a force enable/disable the feature.
*/
ZSTD_ps_auto = 0, /* Let the library automatically determine whether the feature shall be enabled */
ZSTD_ps_enable = 1, /* Force-enable the feature */
ZSTD_ps_disable = 2 /* Do not use the feature */
} ZSTD_paramSwitch_e;
/***************************************
* Frame size functions
@@ -1729,9 +1733,15 @@ ZSTDLIB_API size_t ZSTD_CCtx_refPrefix_advanced(ZSTD_CCtx* cctx, const void* pre
* See the comments on that enum for an explanation of the feature. */
#define ZSTD_c_forceAttachDict ZSTD_c_experimentalParam4
/* Controls how the literals are compressed (default is auto).
* The value must be of type ZSTD_literalCompressionMode_e.
* See ZSTD_literalCompressionMode_e enum definition for details.
/* Controlled with ZSTD_paramSwitch_e enum.
* Default is ZSTD_ps_auto.
* Set to ZSTD_ps_disable to never compress literals.
* Set to ZSTD_ps_enable to always compress literals. (Note: uncompressed literals
* may still be emitted if huffman is not beneficial to use.)
*
* By default, in ZSTD_ps_auto, the library will decide at runtime whether to use
* literals compression based on the compression parameters - specifically,
* negative compression levels do not use literal compression.
*/
#define ZSTD_c_literalCompressionMode ZSTD_c_experimentalParam5
@@ -1883,23 +1893,26 @@ ZSTDLIB_API size_t ZSTD_CCtx_refPrefix_advanced(ZSTD_CCtx* cctx, const void* pre
*/
#define ZSTD_c_validateSequences ZSTD_c_experimentalParam12
/* ZSTD_c_splitBlocks
* Default is 0 == disabled. Set to 1 to enable block splitting.
/* ZSTD_c_useBlockSplitter
* Controlled with ZSTD_paramSwitch_e enum.
* Default is ZSTD_ps_auto.
* Set to ZSTD_ps_disable to never use block splitter.
* Set to ZSTD_ps_enable to always use block splitter.
*
* Will attempt to split blocks in order to improve compression ratio at the cost of speed.
* By default, in ZSTD_ps_auto, the library will decide at runtime whether to use
* block splitting based on the compression parameters.
*/
#define ZSTD_c_splitBlocks ZSTD_c_experimentalParam13
#define ZSTD_c_useBlockSplitter ZSTD_c_experimentalParam13
/* ZSTD_c_useRowMatchFinder
* Default is ZSTD_urm_auto.
* Controlled with ZSTD_useRowMatchFinderMode_e enum.
* Controlled with ZSTD_paramSwitch_e enum.
* Default is ZSTD_ps_auto.
* Set to ZSTD_ps_disable to never use row-based matchfinder.
* Set to ZSTD_ps_enable to force usage of row-based matchfinder.
*
* By default, in ZSTD_urm_auto, when finalizing the compression parameters, the library
* will decide at runtime whether to use the row-based matchfinder based on support for SIMD
* instructions as well as the windowLog.
*
* Set to ZSTD_urm_disableRowMatchFinder to never use row-based matchfinder.
* Set to ZSTD_urm_enableRowMatchFinder to force usage of row-based matchfinder.
* By default, in ZSTD_ps_auto, the library will decide at runtime whether to use
* the row-based matchfinder based on support for SIMD instructions and the window log.
* Note that this only pertains to compression strategies: greedy, lazy, and lazy2
*/
#define ZSTD_c_useRowMatchFinder ZSTD_c_experimentalParam14