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introduced LZ4HC_compress_hashChain

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This commit is contained in:
Przemyslaw Skibinski 2016-12-06 15:21:28 +01:00
parent 3f430daf7a
commit c1ef7a177f
2 changed files with 32 additions and 6 deletions
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30
lib/lz4hc.c
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@ -305,8 +305,9 @@ FORCE_INLINE int LZ4HC_encodeSequence (
return 0;
}
#include "lz4opt.h"
static int LZ4HC_compress_generic (
static int LZ4HC_compress_hashChain (
LZ4HC_CCtx_internal* const ctx,
const char* const source,
char* const dest,
@ -336,8 +337,6 @@ static int LZ4HC_compress_generic (
const BYTE* ref0;
/* init */
if (compressionLevel > LZ4HC_MAX_CLEVEL) compressionLevel = LZ4HC_MAX_CLEVEL;
if (compressionLevel < 1) compressionLevel = LZ4HC_DEFAULT_CLEVEL;
maxNbAttempts = 1 << (compressionLevel-1);
ctx->end += inputSize;
@ -490,6 +489,31 @@ _Search3:
}
static int LZ4HC_compress_generic (
LZ4HC_CCtx_internal* const ctx,
const char* const source,
char* const dest,
int const inputSize,
int const maxOutputSize,
int compressionLevel,
limitedOutput_directive limit
)
{
if (compressionLevel < 1) compressionLevel = LZ4HC_DEFAULT_CLEVEL;
if (compressionLevel > 16) {
switch (compressionLevel) {
case 17: ctx->searchNum = 64; return LZ4HC_compress_optimal(ctx, source, dest, inputSize, maxOutputSize, limit, 0, 64, 0);
case 18: ctx->searchNum = 256; return LZ4HC_compress_optimal(ctx, source, dest, inputSize, maxOutputSize, limit, 0, 256, 0);
case 19: ctx->searchNum = 64; return LZ4HC_compress_optimal(ctx, source, dest, inputSize, maxOutputSize, limit, 1, 64, 0);
case 20:
default: ctx->searchNum = 256; return LZ4HC_compress_optimal(ctx, source, dest, inputSize, maxOutputSize, limit, 1, 256, 0);
}
}
return LZ4HC_compress_hashChain(ctx, source, dest, inputSize, maxOutputSize, compressionLevel, limit);
}
int LZ4_sizeofStateHC(void) { return sizeof(LZ4_streamHC_t); }
int LZ4_compress_HC_extStateHC (void* state, const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel)

8
lib/lz4hc.h
View File

@ -46,7 +46,7 @@ extern "C" {
/* --- Useful constants --- */
#define LZ4HC_MIN_CLEVEL 3
#define LZ4HC_DEFAULT_CLEVEL 9
#define LZ4HC_MAX_CLEVEL 16
#define LZ4HC_MAX_CLEVEL 20
/*-************************************
@ -58,7 +58,7 @@ extern "C" {
* Compression is guaranteed to succeed if `dstCapacity >= LZ4_compressBound(srcSize)` (see "lz4.h")
* Max supported `srcSize` value is LZ4_MAX_INPUT_SIZE (see "lz4.h")
* `compressionLevel` : Recommended values are between 4 and 9, although any value between 1 and LZ4HC_MAX_CLEVEL will work.
* Values >LZ4HC_MAX_CLEVEL behave the same as 16.
* Values >LZ4HC_MAX_CLEVEL behave the same as LZ4HC_MAX_CLEVEL.
* @return : the number of bytes written into 'dst'
* or 0 if compression fails.
*/
@ -153,6 +153,7 @@ typedef struct
uint32_t dictLimit; /* below that point, need extDict */
uint32_t lowLimit; /* below that point, no more dict */
uint32_t nextToUpdate; /* index from which to continue dictionary update */
uint32_t searchNum; /* only for optimal parser */
uint32_t compressionLevel;
} LZ4HC_CCtx_internal;
@ -169,12 +170,13 @@ typedef struct
unsigned int dictLimit; /* below that point, need extDict */
unsigned int lowLimit; /* below that point, no more dict */
unsigned int nextToUpdate; /* index from which to continue dictionary update */
unsigned int searchNum; /* only for optimal parser */
unsigned int compressionLevel;
} LZ4HC_CCtx_internal;
#endif
#define LZ4_STREAMHCSIZE 262192
#define LZ4_STREAMHCSIZE 262200
#define LZ4_STREAMHCSIZE_SIZET (LZ4_STREAMHCSIZE / sizeof(size_t))
union LZ4_streamHC_u {
size_t table[LZ4_STREAMHCSIZE_SIZET];