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Correct incorrect offcode calculation

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senhuang42
2020-10-07 13:56:25 -04:00
parent e96ea5d147
commit 88f72ed942
1 changed files with 2 additions and 1 deletions
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lib/compress/zstd_opt.c
+2 -1
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@@ -866,7 +866,7 @@ static void ZSTD_opt_maybeAddLdm(ZSTD_match_t* matches, U32* nbMatches,
U32 posDiff = currPosInBlock - matchStartPosInBlock; U32 posDiff = currPosInBlock - matchStartPosInBlock;
/* Note: ZSTD_match_t actually contains offCode and matchLength (before subtracting MINMATCH) */ /* Note: ZSTD_match_t actually contains offCode and matchLength (before subtracting MINMATCH) */
U32 candidateMatchLength = matchEndPosInBlock - matchStartPosInBlock - posDiff; U32 candidateMatchLength = matchEndPosInBlock - matchStartPosInBlock - posDiff;
U32 candidateOffCode = matchOffset + posDiff + ZSTD_REP_MOVE; U32 candidateOffCode = matchOffset + ZSTD_REP_MOVE;
/* Ensure that current block position is not outside of the match */ /* Ensure that current block position is not outside of the match */
if (currPosInBlock < matchStartPosInBlock if (currPosInBlock < matchStartPosInBlock
@@ -1146,6 +1146,7 @@ ZSTD_compressBlock_opt_generic(ZSTD_matchState_t* ms,
&ldmEndPosInBlock, &ldmOffset, &ldmEndPosInBlock, &ldmOffset,
(U32)(inr-istart), (U32)(iend-inr)); (U32)(inr-istart), (U32)(iend-inr));
} }
if (!nbMatches) { if (!nbMatches) {
DEBUGLOG(7, "rPos:%u : no match found", cur); DEBUGLOG(7, "rPos:%u : no match found", cur);
continue; continue;