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improved comments 

following @terrelln suggestions
dev
Yann Collet 2018-03-06 18:15:26 -08:00
parent 06ca9c7d7c
commit db147ea620
1 changed files with 6 additions and 2 deletions
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8
lib/decompress/zstd_decompress.c
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@ -1279,6 +1279,10 @@ static size_t ZSTD_decompressSequencesLong(ZSTD_DCtx* dctx,
return ZSTD_decompressSequencesLong_default(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset);
}
/* ZSTD_getLongOffsetsShare() :
* condition : offTable must be valid
* @return : "share" of long offsets (arbitrarily defined as > (1<<23))
* compared to maximum possible of (1<<OffFSELog) */
static unsigned
ZSTD_getLongOffsetsShare(const ZSTD_seqSymbol* offTable)
{
@ -1331,10 +1335,10 @@ static size_t ZSTD_decompressBlock_internal(ZSTD_DCtx* dctx,
ip += seqHSize;
srcSize -= seqHSize;
if ( (dctx->fParams.windowSize > (1<<24) || !frame)
if ( (!frame || dctx->fParams.windowSize > (1<<24))
&& (nbSeq>0) ) { /* could probably use a larger nbSeq limit */
U32 const shareLongOffsets = ZSTD_getLongOffsetsShare(dctx->OFTptr);
U32 const minShare = MEM_64bits() ? 7 : 20;
U32 const minShare = MEM_64bits() ? 7 : 20; /* heuristic values, correspond to 2.73% and 7.81% */
if (shareLongOffsets >= minShare)
return ZSTD_decompressSequencesLong(dctx, dst, dstCapacity, ip, srcSize, nbSeq, isLongOffset);
}