AuroraMiddleware/zstd
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Address edge case with endPosInSequence

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This commit is contained in:
senhuang42 2020-11-04 11:05:41 -05:00
parent fd10007174
commit cc2642bd17
1 changed files with 13 additions and 5 deletions
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18
lib/compress/zstd_compress.c
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@ -4493,7 +4493,7 @@ static int ZSTD_updateSequenceRange(ZSTD_sequenceRange* sequenceRange, size_t bl
U32 idx = sequenceRange->endIdx;
U32 endPosInSequence = sequenceRange->endPosInSequence + blockSize;
int bytesAdjustment = 0;
DEBUGLOG(5, "ZSTD_updateSequenceRange: %zu bytes, startidx %u startpos: %u endidx: %u endpos: %u", blockSize,
DEBUGLOG(4, "ZSTD_updateSequenceRange: %zu bytes, startidx %u startpos: %u endidx: %u endpos: %u", blockSize,
sequenceRange->startIdx, sequenceRange->startPosInSequence, sequenceRange->endIdx, sequenceRange->endPosInSequence);
DEBUGLOG(5, "endPosInSequence begin val: %u", endPosInSequence);
while (endPosInSequence && idx < inSeqsSize) {
@ -4505,6 +4505,9 @@ static int ZSTD_updateSequenceRange(ZSTD_sequenceRange* sequenceRange, size_t bl
break;
}
}
if (idx == inSeqsSize) {
endPosInSequence = 0;
}
if (format == ZSTD_sf_noBlockDelimiters) {
assert(endPosInSequence <= inSeqs[idx].litLength + inSeqs[idx].matchLength);
@ -4541,9 +4544,9 @@ static int ZSTD_updateSequenceRange(ZSTD_sequenceRange* sequenceRange, size_t bl
assert(sequenceRange->startPosInSequence <= inSeqs[sequenceRange->startIdx].litLength + inSeqs[sequenceRange->startIdx].matchLength);
assert(sequenceRange->endPosInSequence <= inSeqs[sequenceRange->endIdx].litLength + inSeqs[sequenceRange->endIdx].matchLength);
DEBUGLOG(5, "endidx: (of: %u ml: %u ll: %u)", inSeqs[sequenceRange->endIdx].offset, inSeqs[sequenceRange->endIdx].matchLength, inSeqs[sequenceRange->endIdx].litLength);
DEBUGLOG(5, "finished update: startidx %u startpos: %u endidx: %u endpos: %u",
DEBUGLOG(4, "finished update: startidx %u startpos: %u endidx: %u endpos: %u",
sequenceRange->startIdx, sequenceRange->startPosInSequence, sequenceRange->endIdx, sequenceRange->endPosInSequence);
DEBUGLOG(5, "endidx: (of: %u ml: %u ll: %u)", inSeqs[sequenceRange->endIdx].offset, inSeqs[sequenceRange->endIdx].matchLength, inSeqs[sequenceRange->endIdx].litLength);
DEBUGLOG(5, "final PIS was additionally adjusted by: %d bytes", bytesAdjustment);
return bytesAdjustment;
}
@ -4571,8 +4574,8 @@ static size_t ZSTD_copySequencesToSeqStore(seqStore_t* seqStore, const ZSTD_sequ
if (seqRange->startIdx == seqRange->endIdx) {
/* The sequence spans the entire block */
U32 seqLength = seqRange->endPosInSequence - seqRange->startPosInSequence;
DEBUGLOG(5, "Range within single sequence: idx: %u (of: %u ml: %u ll: %u) rep: %u",
seqRange->startIdx offCode, matchLength, litLength, inSeqs[idx].rep);
DEBUGLOG(5, "Range within single sequence: idx: %zu (of: %u ml: %u ll: %u) rep: %u",
idx, offCode, matchLength, litLength, inSeqs[idx].rep);
RETURN_ERROR_IF(seqLength > litLength + matchLength, corruption_detected,
"range length cannot be bigger than sequence length!");
if (seqLength <= litLength) {
@ -4582,6 +4585,11 @@ static size_t ZSTD_copySequencesToSeqStore(seqStore_t* seqStore, const ZSTD_sequ
/* Spanned range ends in the match section */
matchLength = seqLength - litLength;
}
/* ZSTD_updateSequenceRange should never give us a position such that we generate a match too small */
RETURN_ERROR_IF(matchLength < MINMATCH && offCode != ZSTD_REP_MOVE, corruption_detected,
"Matchlength too small for sequence spanning a whole block!");
DEBUGLOG(5, "seq finalized: (of: %u ml: %u ll: %u) rep: %u", offCode, matchLength, litLength, inSeqs[idx].rep);
} else if (idx == seqRange->startIdx) {
/* Modify the sequence at the start of the range as necessary */
U32 posInSequence = seqRange->startPosInSequence;