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added ZSTDv05_getFrameParams() to "zstd_v05.h"

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This commit is contained in:
Yann Collet 2016-05-17 12:01:55 +02:00
parent d9b3cca4d3
commit ea4daa308d
2 changed files with 9 additions and 16 deletions
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15
lib/legacy/zstd_v05.c
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@ -436,21 +436,6 @@ extern "C" {
***************************************/
#define ZSTDv05_WINDOWLOG_ABSOLUTEMIN 11
/* from faster to stronger */
typedef enum { ZSTDv05_fast, ZSTDv05_greedy, ZSTDv05_lazy, ZSTDv05_lazy2, ZSTDv05_btlazy2, ZSTDv05_opt, ZSTDv05_btopt } ZSTDv05_strategy;
typedef struct
{
U64 srcSize; /* optional : tells how much bytes are present in the frame. Use 0 if not known. */
U32 windowLog; /* largest match distance : larger == more compression, more memory needed during decompression */
U32 contentLog; /* full search segment : larger == more compression, slower, more memory (useless for fast) */
U32 hashLog; /* dispatch table : larger == faster, more memory */
U32 searchLog; /* nb of searches : larger == more compression, slower */
U32 searchLength; /* match length searched : larger == faster decompression, sometimes less compression */
U32 targetLength; /* acceptable match size for optimal parser (only) : larger == more compression, slower */
ZSTDv05_strategy strategy;
} ZSTDv05_parameters;
/*-*************************************
* Advanced functions

10
lib/legacy/zstd_v05.h
View File

@ -40,7 +40,7 @@ extern "C" {
* Dependencies
***************************************/
#include <stddef.h> /* size_t */
#include "mem.h" /* U64, U32 */
/* *************************************
@ -91,6 +91,14 @@ size_t ZSTDv05_decompress_usingDict(ZSTDv05_DCtx* dctx,
/*-************************
* Advanced Streaming API
***************************/
typedef enum { ZSTDv05_fast, ZSTDv05_greedy, ZSTDv05_lazy, ZSTDv05_lazy2, ZSTDv05_btlazy2, ZSTDv05_opt, ZSTDv05_btopt } ZSTDv05_strategy;
typedef struct {
U64 srcSize;
U32 windowLog; /* the only useful information to retrieve */
U32 contentLog; U32 hashLog; U32 searchLog; U32 searchLength; U32 targetLength; ZSTDv05_strategy strategy;
} ZSTDv05_parameters;
size_t ZSTDv05_getFrameParams(ZSTDv05_parameters* params, const void* src, size_t srcSize);
size_t ZSTDv05_decompressBegin_usingDict(ZSTDv05_DCtx* dctx, const void* dict, size_t dictSize);
void ZSTDv05_copyDCtx(ZSTDv05_DCtx* dstDCtx, const ZSTDv05_DCtx* srcDCtx);
size_t ZSTDv05_nextSrcSizeToDecompress(ZSTDv05_DCtx* dctx);