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Refactor usage of ms->ldmSeqStore so that it is not modified during compressBlock(), and simplify skipRawSeqStoreBytes

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This commit is contained in:
senhuang42
2020-10-07 13:56:25 -04:00
parent a5500cf2af
commit 0fac8e07e1
2 changed files with 64 additions and 62 deletions
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lib/compress/zstd_ldm.c
+25 -1
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@@ -555,6 +555,26 @@ static rawSeq maybeSplitSequence(rawSeqStore_t* rawSeqStore,
return sequence;
}
/* ZSTD_ldm_skipRawSeqStoreBytes():
* Moves forward in rawSeqStore by nbBytes, updating fields 'pos' and 'posInSequence'.
*/
static void ZSTD_ldm_skipRawSeqStoreBytes(rawSeqStore_t* rawSeqStore, size_t nbBytes) {
U32 currPos = rawSeqStore->posInSequence + nbBytes;
while (currPos && rawSeqStore->pos < rawSeqStore->size) {
rawSeq currSeq = rawSeqStore->seq[rawSeqStore->pos];
if (currPos >= currSeq.litLength + currSeq.matchLength) {
currPos -= currSeq.litLength + currSeq.matchLength;
rawSeqStore->pos++;
if (currPos == 0) {
rawSeqStore->posInSequence = 0;
}
} else {
rawSeqStore->posInSequence = currPos;
break;
}
}
}
size_t ZSTD_ldm_blockCompress(rawSeqStore_t* rawSeqStore,
ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
void const* src, size_t srcSize)
@@ -574,7 +594,11 @@ size_t ZSTD_ldm_blockCompress(rawSeqStore_t* rawSeqStore,
size_t lastLLSize;
ms->ldmSeqStore = *rawSeqStore;
lastLLSize = blockCompressor(ms, seqStore, rep, src, srcSize);
*rawSeqStore = ms->ldmSeqStore;
ZSTD_ldm_skipRawSeqStoreBytes(rawSeqStore, srcSize);
if (rawSeqStore->pos >= rawSeqStore->size) {
/* If we're done with rawSeqStore, invalidate the one in matchState as well */
ms->ldmSeqStore.pos = rawSeqStore->size;
}
return lastLLSize;
}