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fixed default fse distributions

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but would be better to pre-calculate tables, for speed
This commit is contained in:
Yann Collet 2018-02-09 04:50:58 -08:00
parent 95424409ea
commit 421a2716d8
1 changed files with 15 additions and 18 deletions
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33
lib/decompress/zstd_decompress.c
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@ -82,8 +82,8 @@ typedef enum { zdss_init=0, zdss_loadHeader,
typedef struct {
U32 tableLog;
U32 fastMode;
U32 tableLog;
} ZSTD_seqSymbol_header;
typedef struct {
@ -665,28 +665,22 @@ size_t ZSTD_decodeLiteralsBlock(ZSTD_DCtx* dctx,
}
}
typedef union {
FSE_decode_t realData;
FSE_DTable dtable;
U32 alignedBy4;
} FSE_decode_t4;
#if 0
/* Default FSE distribution table for Literal Lengths */
static const FSE_decode_t4 LL_defaultDTable[(1<<LL_DEFAULTNORMLOG)+1] = {
{ { LL_DEFAULTNORMLOG, 1, 1 } }, /* header : tableLog, fastMode, fastMode */
static const ZSTD_seqSymbol LL_defaultDTable[(1<<LL_DEFAULTNORMLOG)+1] = {
{ 1, 0, 1, LL_DEFAULTNORMLOG }, /* header : tableLog, fastMode, fastMode */
/* base, symbol, bits */
{ { 0, 0, 4 } }, { { 16, 0, 4 } }, { { 32, 1, 5 } }, { { 0, 3, 5 } },
{ 0, 0, 4, 0 }, { 16, 0, 4, 0 }, { 32, 1, 5 }, { 0, 3, 5 },
{ { 0, 4, 5 } }, { { 0, 6, 5 } }, { { 0, 7, 5 } }, { { 0, 9, 5 } },
{ { 0, 10, 5 } }, { { 0, 12, 5 } }, { { 0, 14, 6 } }, { { 0, 16, 5 } },
{ { 0, 18, 5 } }, { { 0, 19, 5 } }, { { 0, 21, 5 } }, { { 0, 22, 5 } },
{ { 0, 24, 5 } }, { { 32, 25, 5 } }, { { 0, 26, 5 } }, { { 0, 27, 6 } },
{ { 0, 29, 6 } }, { { 0, 31, 6 } }, { { 32, 0, 4 } }, { { 0, 1, 4 } },
{ { 0, 29, 6 } }, { { 0, 31, 6 } }, { { 32, 0, 4, 0 } }, { { 0, 1, 4 } },
{ { 0, 2, 5 } }, { { 32, 4, 5 } }, { { 0, 5, 5 } }, { { 32, 7, 5 } },
{ { 0, 8, 5 } }, { { 32, 10, 5 } }, { { 0, 11, 5 } }, { { 0, 13, 6 } },
{ { 32, 16, 5 } }, { { 0, 17, 5 } }, { { 32, 19, 5 } }, { { 0, 20, 5 } },
{ { 32, 22, 5 } }, { { 0, 23, 5 } }, { { 0, 25, 4 } }, { { 16, 25, 4 } },
{ { 32, 26, 5 } }, { { 0, 28, 6 } }, { { 0, 30, 6 } }, { { 48, 0, 4 } },
{ { 32, 26, 5 } }, { { 0, 28, 6 } }, { { 0, 30, 6 } }, { { 48, 0, 4, 0 } },
{ { 16, 1, 4 } }, { { 32, 2, 5 } }, { { 32, 3, 5 } }, { { 32, 5, 5 } },
{ { 32, 6, 5 } }, { { 32, 8, 5 } }, { { 32, 9, 5 } }, { { 32, 11, 5 } },
{ { 32, 12, 5 } }, { { 0, 15, 6 } }, { { 32, 17, 5 } }, { { 32, 18, 5 } },
@ -738,6 +732,7 @@ static const FSE_decode_t4 OF_defaultDTable[(1<<OF_DEFAULTNORMLOG)+1] = {
{ { 0, 25, 5 } }, { { 0, 24, 5 } },
}; /* OF_defaultDTable */
#endif
static void ZSTD_buildSeqTable_rle(ZSTD_seqSymbol* dt, BYTE symbolValue)
{
@ -826,7 +821,7 @@ static size_t ZSTD_buildSeqTable(ZSTD_seqSymbol* DTableSpace, const ZSTD_seqSymb
symbolEncodingType_e type, U32 max, U32 maxLog,
const void* src, size_t srcSize,
const U32* baseValue, const U32* nbAdditionalBits,
const FSE_decode_t4* defaultTable, U32 flagRepeatTable)
const S16* defaultNorm, U32 defaultLog, U32 flagRepeatTable)
{
switch(type)
{
@ -838,7 +833,9 @@ static size_t ZSTD_buildSeqTable(ZSTD_seqSymbol* DTableSpace, const ZSTD_seqSymb
return 1;
case set_basic :
assert(0); /* need to rebuild all default tables */
*DTablePtr = &defaultTable->dtable;
//*DTablePtr = &defaultTable->dtable;
ZSTD_buildFSETable(DTableSpace, defaultNorm, max, baseValue, nbAdditionalBits, defaultLog);
*DTablePtr = DTableSpace;
return 0;
case set_repeat:
if (!flagRepeatTable) return ERROR(corruption_detected);
@ -922,7 +919,7 @@ size_t ZSTD_decodeSeqHeaders(ZSTD_DCtx* dctx, int* nbSeqPtr,
LLtype, MaxLL, LLFSELog,
ip, iend-ip,
LL_base, LL_bits,
LL_defaultDTable, dctx->fseEntropy);
LL_defaultNorm, LL_defaultNormLog, dctx->fseEntropy);
if (ZSTD_isError(llhSize)) return ERROR(corruption_detected);
ip += llhSize;
}
@ -931,7 +928,7 @@ size_t ZSTD_decodeSeqHeaders(ZSTD_DCtx* dctx, int* nbSeqPtr,
OFtype, MaxOff, OffFSELog,
ip, iend-ip,
OF_base, OF_bits,
OF_defaultDTable, dctx->fseEntropy);
OF_defaultNorm, OF_defaultNormLog, dctx->fseEntropy);
if (ZSTD_isError(ofhSize)) return ERROR(corruption_detected);
ip += ofhSize;
}
@ -940,7 +937,7 @@ size_t ZSTD_decodeSeqHeaders(ZSTD_DCtx* dctx, int* nbSeqPtr,
MLtype, MaxML, MLFSELog,
ip, iend-ip,
ML_base, ML_bits,
ML_defaultDTable, dctx->fseEntropy);
ML_defaultNorm, ML_defaultNormLog, dctx->fseEntropy);
if (ZSTD_isError(mlhSize)) return ERROR(corruption_detected);
ip += mlhSize;
}