facebook
/
zstd
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Only Insert Positions Inside the Chain Window

dev
W. Felix Handte 2020-09-02 17:29:46 -04:00
parent 13c5ec3e41
commit 66509c7bf4
1 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
lib/compress/zstd_lazy.c
View File

@ -480,8 +480,10 @@ void ZSTD_dedicatedDictSearch_lazy_loadDictionary(ZSTD_matchState_t* ms, const B
{
U32 const target = (U32)(ip - ms->window.base);
U32* const chainTable = ms->chainTable;
U32 const chainMask = (1 << ms->cParams.chainLog) - 1;
U32 const chainSize = 1 << ms->cParams.chainLog;
U32 const chainMask = chainSize - 1;
U32 idx = ms->nextToUpdate;
U32 const minChain = chainSize > target ? 0 : target - chainSize;
U32 bucketSize = 1 << ZSTD_LAZY_DDSS_BUCKET_LOG;
for ( ; idx < target; idx++) {
U32 i;
@ -493,7 +495,9 @@ void ZSTD_dedicatedDictSearch_lazy_loadDictionary(ZSTD_matchState_t* ms, const B
for (i = bucketSize - 1; i; i--)
ms->hashTable[h + i] = ms->hashTable[h + i - 1];
/* Insert new position. */
chainTable[idx & chainMask] = ms->hashTable[h];
if (idx >= minChain) {
chainTable[idx & chainMask] = ms->hashTable[h];
}
ms->hashTable[h] = idx;
}