AuroraMiddleware/zstd
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minor refactor

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This commit is contained in:
Yann Collet 2016-08-30 09:56:25 -07:00
parent 240795bef7
commit 3b15f1f10f
1 changed files with 9 additions and 9 deletions
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18
lib/dictBuilder/zdict.c
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@ -35,6 +35,7 @@
* Tuning parameters
****************************************/
#define ZDICT_MAX_SAMPLES_SIZE (2000U << 20)
#define ZDICT_MIN_SAMPLES_SIZE 512
/*-**************************************
@ -78,11 +79,9 @@
#define MB *(1 <<20)
#define GB *(1U<<30)
#define DICTLISTSIZE 10000
#define DICTLISTSIZE_DEFAULT 10000
#define NOISELENGTH 32
#define PRIME1 2654435761U
#define PRIME2 2246822519U
#define MINRATIO 4
static const int g_compressionLevel_default = 5;
@ -560,10 +559,12 @@ _cleanup:
static void ZDICT_fillNoise(void* buffer, size_t length)
{
unsigned acc = PRIME1;
unsigned const prime1 = 2654435761U;
unsigned const prime2 = 2246822519U;
unsigned acc = prime1;
size_t p=0;;
for (p=0; p<length; p++) {
acc *= PRIME2;
acc *= prime2;
((unsigned char*)buffer)[p] = (unsigned char)(acc >> 21);
}
}
@ -878,7 +879,6 @@ size_t ZDICT_addEntropyTablesFromBuffer_advanced(void* dictBuffer, size_t dictCo
}
#define DIB_MINSAMPLESSIZE 512
/*! ZDICT_trainFromBuffer_unsafe() :
* Warning : `samplesBuffer` must be followed by noisy guard band.
* @return : size of dictionary, or an error code which can be tested with ZDICT_isError()
@ -888,7 +888,7 @@ size_t ZDICT_trainFromBuffer_unsafe(
const void* samplesBuffer, const size_t* samplesSizes, unsigned nbSamples,
ZDICT_params_t params)
{
U32 const dictListSize = MAX(MAX(DICTLISTSIZE, nbSamples), (U32)(maxDictSize/16));
U32 const dictListSize = MAX(MAX(DICTLISTSIZE_DEFAULT, nbSamples), (U32)(maxDictSize/16));
dictItem* const dictList = (dictItem*)malloc(dictListSize * sizeof(*dictList));
unsigned const selectivity = params.selectivityLevel == 0 ? g_selectivity_default : params.selectivityLevel;
unsigned const minRep = (selectivity > 30) ? MINRATIO : nbSamples >> selectivity;
@ -899,7 +899,7 @@ size_t ZDICT_trainFromBuffer_unsafe(
/* checks */
if (!dictList) return ERROR(memory_allocation);
if (maxDictSize <= g_provision_entropySize + g_min_fast_dictContent) { free(dictList); return ERROR(dstSize_tooSmall); }
if (samplesBuffSize < DIB_MINSAMPLESSIZE) { free(dictList); return 0; } /* not enough source to create dictionary */
if (samplesBuffSize < ZDICT_MIN_SAMPLES_SIZE) { free(dictList); return 0; } /* not enough source to create dictionary */
/* init */
ZDICT_initDictItem(dictList);
@ -990,7 +990,7 @@ size_t ZDICT_trainFromBuffer_advanced(void* dictBuffer, size_t dictBufferCapacit
size_t result;
void* newBuff;
size_t const sBuffSize = ZDICT_totalSampleSize(samplesSizes, nbSamples);
if (sBuffSize < DIB_MINSAMPLESSIZE) return 0; /* not enough content => no dictionary */
if (sBuffSize < ZDICT_MIN_SAMPLES_SIZE) return 0; /* not enough content => no dictionary */
newBuff = malloc(sBuffSize + NOISELENGTH);
if (!newBuff) return ERROR(memory_allocation);