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Require LDM matches to be strictly greater in length

dev
senhuang42 2020-10-07 23:44:36 -04:00
parent b9c8033cde
commit d6911b86be
1 changed files with 3 additions and 14 deletions
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17
lib/compress/zstd_opt.c
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@ -867,20 +867,9 @@ static void ZSTD_optLdm_maybeAddMatch(ZSTD_match_t* matches, U32* nbMatches,
return;
}
DEBUGLOG(6, "ZSTD_optLdm_maybeAddMatch(): Adding ldm candidate match (offCode: %u matchLength %u) at block position=%u",
candidateOffCode, candidateMatchLength, currPosInBlock);
if (*nbMatches == 0) {
matches[*nbMatches].len = candidateMatchLength;
matches[*nbMatches].off = candidateOffCode;
(*nbMatches)++;
} else if ((candidateMatchLength >= matches[*nbMatches-1].len) && *nbMatches < ZSTD_OPT_NUM) {
if (candidateMatchLength == matches[*nbMatches-1].len) {
/* No need to insert match with same matchLength. At most, replace offCode if it is smaller. */
if (candidateOffCode < matches[*nbMatches-1].off) {
matches[*nbMatches-1].off = candidateOffCode;
}
return;
}
if (*nbMatches == 0 || ((candidateMatchLength > matches[*nbMatches-1].len) && *nbMatches < ZSTD_OPT_NUM)) {
DEBUGLOG(6, "ZSTD_optLdm_maybeAddMatch(): Adding ldm candidate match (offCode: %u matchLength %u) at block position=%u",
candidateOffCode, candidateMatchLength, currPosInBlock);
matches[*nbMatches].len = candidateMatchLength;
matches[*nbMatches].off = candidateOffCode;
(*nbMatches)++;