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fixed mono-symbol distribution

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This commit is contained in:
Yann Collet 2018-02-09 05:12:13 -08:00
parent 421a2716d8
commit ab75df21ed
1 changed files with 10 additions and 6 deletions
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16
lib/decompress/zstd_decompress.c
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@ -734,7 +734,7 @@ static const FSE_decode_t4 OF_defaultDTable[(1<<OF_DEFAULTNORMLOG)+1] = {
#endif #endif
static void ZSTD_buildSeqTable_rle(ZSTD_seqSymbol* dt, BYTE symbolValue) static void ZSTD_buildSeqTable_rle(ZSTD_seqSymbol* dt, U32 baseValue, U32 nbAddBits)
{ {
void* ptr = dt; void* ptr = dt;
ZSTD_seqSymbol_header* const DTableH = (ZSTD_seqSymbol_header*)ptr; ZSTD_seqSymbol_header* const DTableH = (ZSTD_seqSymbol_header*)ptr;
@ -745,8 +745,9 @@ static void ZSTD_buildSeqTable_rle(ZSTD_seqSymbol* dt, BYTE symbolValue)
cell->nbBits = 0; cell->nbBits = 0;
cell->nextState = 0; cell->nextState = 0;
cell->nbAdditionalBits = 0; assert(nbAddBits < 255);
cell->baseValue = symbolValue; cell->nbAdditionalBits = (BYTE)nbAddBits;
cell->baseValue = baseValue;
} }
@ -828,12 +829,15 @@ static size_t ZSTD_buildSeqTable(ZSTD_seqSymbol* DTableSpace, const ZSTD_seqSymb
case set_rle : case set_rle :
if (!srcSize) return ERROR(srcSize_wrong); if (!srcSize) return ERROR(srcSize_wrong);
if ( (*(const BYTE*)src) > max) return ERROR(corruption_detected); if ( (*(const BYTE*)src) > max) return ERROR(corruption_detected);
ZSTD_buildSeqTable_rle(DTableSpace, *(const BYTE*)src); { U32 const symbol = *(const BYTE*)src;
U32 const baseline = baseValue[symbol];
U32 const nbBits = nbAdditionalBits[symbol];
ZSTD_buildSeqTable_rle(DTableSpace, baseline, nbBits);
}
*DTablePtr = DTableSpace; *DTablePtr = DTableSpace;
return 1; return 1;
case set_basic : case set_basic :
assert(0); /* need to rebuild all default tables */ //*DTablePtr = &defaultTable->dtable; // when default tables will be pre-built
//*DTablePtr = &defaultTable->dtable;
ZSTD_buildFSETable(DTableSpace, defaultNorm, max, baseValue, nbAdditionalBits, defaultLog); ZSTD_buildFSETable(DTableSpace, defaultNorm, max, baseValue, nbAdditionalBits, defaultLog);
*DTablePtr = DTableSpace; *DTablePtr = DTableSpace;
return 0; return 0;