AuroraMiddleware/zstd
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support targetlen==0 with strategy==ZSTD_fast

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to mean "normal compression",
targetlen >= 1 now means "disable huffman compression of literals"
This commit is contained in:
Yann Collet 2018-06-07 15:49:01 -07:00
parent a57b4df85f
commit c2c47e24e0
4 changed files with 13 additions and 14 deletions
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17
lib/compress/zstd_compress.c
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@ -689,8 +689,6 @@ size_t ZSTD_checkCParams(ZSTD_compressionParameters cParams)
CLAMPCHECK(cParams.hashLog, ZSTD_HASHLOG_MIN, ZSTD_HASHLOG_MAX);
CLAMPCHECK(cParams.searchLog, ZSTD_SEARCHLOG_MIN, ZSTD_SEARCHLOG_MAX);
CLAMPCHECK(cParams.searchLength, ZSTD_SEARCHLENGTH_MIN, ZSTD_SEARCHLENGTH_MAX);
if ((U32)(cParams.targetLength) < ZSTD_TARGETLENGTH_MIN)
return ERROR(parameter_unsupported);
if ((U32)(cParams.strategy) > (U32)ZSTD_btultra)
return ERROR(parameter_unsupported);
return 0;
@ -710,7 +708,6 @@ static ZSTD_compressionParameters ZSTD_clampCParams(ZSTD_compressionParameters c
CLAMP(cParams.hashLog, ZSTD_HASHLOG_MIN, ZSTD_HASHLOG_MAX);
CLAMP(cParams.searchLog, ZSTD_SEARCHLOG_MIN, ZSTD_SEARCHLOG_MAX);
CLAMP(cParams.searchLength, ZSTD_SEARCHLENGTH_MIN, ZSTD_SEARCHLENGTH_MAX);
if ((U32)(cParams.targetLength) < ZSTD_TARGETLENGTH_MIN) cParams.targetLength = ZSTD_TARGETLENGTH_MIN;
if ((U32)(cParams.strategy) > (U32)ZSTD_btultra) cParams.strategy = ZSTD_btultra;
return cParams;
}
@ -3713,8 +3710,8 @@ static const ZSTD_compressionParameters ZSTD_defaultCParameters[4][ZSTD_MAX_CLEV
{ /* "default" - guarantees a monotonically increasing memory budget */
/* W, C, H, S, L, TL, strat */
{ 19, 12, 13, 1, 6, 1, ZSTD_fast }, /* base for negative levels */
{ 19, 13, 14, 1, 7, 1, ZSTD_fast }, /* level 1 */
{ 19, 15, 16, 1, 6, 1, ZSTD_fast }, /* level 2 */
{ 19, 13, 14, 1, 7, 0, ZSTD_fast }, /* level 1 */
{ 19, 15, 16, 1, 6, 0, ZSTD_fast }, /* level 2 */
{ 20, 16, 17, 1, 5, 1, ZSTD_dfast }, /* level 3 */
{ 20, 18, 18, 1, 5, 1, ZSTD_dfast }, /* level 4 */
{ 20, 18, 18, 2, 5, 2, ZSTD_greedy }, /* level 5 */
@ -3739,7 +3736,7 @@ static const ZSTD_compressionParameters ZSTD_defaultCParameters[4][ZSTD_MAX_CLEV
{ /* for srcSize <= 256 KB */
/* W, C, H, S, L, T, strat */
{ 18, 12, 13, 1, 5, 1, ZSTD_fast }, /* base for negative levels */
{ 18, 13, 14, 1, 6, 1, ZSTD_fast }, /* level 1 */
{ 18, 13, 14, 1, 6, 0, ZSTD_fast }, /* level 1 */
{ 18, 14, 14, 1, 5, 1, ZSTD_dfast }, /* level 2 */
{ 18, 16, 16, 1, 4, 1, ZSTD_dfast }, /* level 3 */
{ 18, 16, 17, 2, 5, 2, ZSTD_greedy }, /* level 4.*/
@ -3765,8 +3762,8 @@ static const ZSTD_compressionParameters ZSTD_defaultCParameters[4][ZSTD_MAX_CLEV
{ /* for srcSize <= 128 KB */
/* W, C, H, S, L, T, strat */
{ 17, 12, 12, 1, 5, 1, ZSTD_fast }, /* base for negative levels */
{ 17, 12, 13, 1, 6, 1, ZSTD_fast }, /* level 1 */
{ 17, 13, 15, 1, 5, 1, ZSTD_fast }, /* level 2 */
{ 17, 12, 13, 1, 6, 0, ZSTD_fast }, /* level 1 */
{ 17, 13, 15, 1, 5, 0, ZSTD_fast }, /* level 2 */
{ 17, 15, 16, 2, 5, 1, ZSTD_dfast }, /* level 3 */
{ 17, 17, 17, 2, 4, 1, ZSTD_dfast }, /* level 4 */
{ 17, 16, 17, 3, 4, 2, ZSTD_greedy }, /* level 5 */
@ -3791,8 +3788,8 @@ static const ZSTD_compressionParameters ZSTD_defaultCParameters[4][ZSTD_MAX_CLEV
{ /* for srcSize <= 16 KB */
/* W, C, H, S, L, T, strat */
{ 14, 12, 13, 1, 5, 1, ZSTD_fast }, /* base for negative levels */
{ 14, 14, 15, 1, 5, 1, ZSTD_fast }, /* level 1 */
{ 14, 14, 15, 1, 4, 1, ZSTD_fast }, /* level 2 */
{ 14, 14, 15, 1, 5, 0, ZSTD_fast }, /* level 1 */
{ 14, 14, 15, 1, 4, 0, ZSTD_fast }, /* level 2 */
{ 14, 14, 14, 2, 4, 1, ZSTD_dfast }, /* level 3.*/
{ 14, 14, 14, 4, 4, 2, ZSTD_greedy }, /* level 4.*/
{ 14, 14, 14, 3, 4, 4, ZSTD_lazy }, /* level 5.*/

7
lib/compress/zstd_fast.c
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@ -45,7 +45,7 @@ FORCE_INLINE_TEMPLATE
size_t ZSTD_compressBlock_fast_generic(
ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
void const* src, size_t srcSize,
U32 const hlog, U32 const stepSize, U32 const mls,
U32 const hlog, U32 stepSize, U32 const mls,
ZSTD_dictMode_e const dictMode)
{
U32* const hashTable = ms->hashTable;
@ -84,6 +84,7 @@ size_t ZSTD_compressBlock_fast_generic(
|| prefixStartIndex >= (U32)(dictEnd - dictBase));
/* init */
stepSize += !stepSize; /* support stepSize of 0 */
ip += (dictAndPrefixLength == 0);
if (dictMode == ZSTD_noDict) {
U32 const maxRep = (U32)(ip - prefixStart);
@ -264,7 +265,7 @@ size_t ZSTD_compressBlock_fast_dictMatchState(
static size_t ZSTD_compressBlock_fast_extDict_generic(
ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
void const* src, size_t srcSize,
U32 const hlog, U32 const stepSize, U32 const mls)
U32 const hlog, U32 stepSize, U32 const mls)
{
U32* hashTable = ms->hashTable;
const BYTE* const base = ms->window.base;
@ -281,6 +282,8 @@ static size_t ZSTD_compressBlock_fast_extDict_generic(
const BYTE* const ilimit = iend - 8;
U32 offset_1=rep[0], offset_2=rep[1];
stepSize += !stepSize; /* support stepSize == 0 */
/* Search Loop */
while (ip < ilimit) { /* < instead of <=, because (ip+1) */
const size_t h = ZSTD_hashPtr(ip, hlog, mls);

1
lib/zstd.h
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@ -395,7 +395,6 @@ ZSTDLIB_API size_t ZSTD_DStreamOutSize(void); /*!< recommended size for output
#define ZSTD_SEARCHLOG_MIN 1
#define ZSTD_SEARCHLENGTH_MAX 7 /* only for ZSTD_fast, other strategies are limited to 6 */
#define ZSTD_SEARCHLENGTH_MIN 3 /* only for ZSTD_btopt, other strategies are limited to 4 */
#define ZSTD_TARGETLENGTH_MIN 1 /* only used by btopt, btultra and btfast */
#define ZSTD_LDM_MINMATCH_MIN 4
#define ZSTD_LDM_MINMATCH_MAX 4096
#define ZSTD_LDM_BUCKETSIZELOG_MAX 8

2
tests/paramgrill.c
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@ -598,7 +598,7 @@ static ZSTD_compressionParameters randomParams(void)
p.searchLog = (FUZ_rand(&g_rand) % (ZSTD_SEARCHLOG_MAX+1 - ZSTD_SEARCHLOG_MIN)) + ZSTD_SEARCHLOG_MIN;
p.windowLog = (FUZ_rand(&g_rand) % (ZSTD_WINDOWLOG_MAX+1 - ZSTD_WINDOWLOG_MIN)) + ZSTD_WINDOWLOG_MIN;
p.searchLength=(FUZ_rand(&g_rand) % (ZSTD_SEARCHLENGTH_MAX+1 - ZSTD_SEARCHLENGTH_MIN)) + ZSTD_SEARCHLENGTH_MIN;
p.targetLength=(FUZ_rand(&g_rand) % (512)) + ZSTD_TARGETLENGTH_MIN;
p.targetLength=(FUZ_rand(&g_rand) % (512));
p.strategy = (ZSTD_strategy) (FUZ_rand(&g_rand) % (ZSTD_btultra +1));
validated = !ZSTD_isError(ZSTD_checkCParams(p));
}