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Add cSize regression test to fuzzer.c

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This commit is contained in:
senhuang42 2020-10-02 09:49:35 -04:00
parent c87d2e5866
commit b8bfc4e63d
4 changed files with 44 additions and 1 deletions
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2
lib/compress/zstd_ldm.c
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@ -575,6 +575,8 @@ size_t ZSTD_ldm_blockCompress(rawSeqStore_t* rawSeqStore,
BYTE const* const iend = istart + srcSize;
/* Input positions */
BYTE const* ip = istart;
/* If using opt parser, use LDMs only as candidates rather than always accepting them */
if (cParams->strategy >= ZSTD_btopt) {
size_t lastLLSize;
ms->ldmSeqStore = *rawSeqStore;

3
lib/compress/zstd_opt.c
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@ -774,7 +774,9 @@ FORCE_INLINE_TEMPLATE U32 ZSTD_BtGetAllMatches (
static void ZSTD_opt_skipBytesInLdmSeqStore(rawSeqStore_t* ldmSeqStore, size_t nbBytes) {
while (nbBytes && ldmSeqStore->pos < ldmSeqStore->size) {
rawSeq currSeq = ldmSeqStore->seq[ldmSeqStore->pos];
/* posInSequence necessarily must never represent a value beyond the sequence */
assert(ldmSeqStore->posInSequence <= currSeq.matchLength + currSeq.litLength);
if (nbBytes <= currSeq.litLength) {
ldmSeqStore->posInSequence += nbBytes;
return;
@ -782,6 +784,7 @@ static void ZSTD_opt_skipBytesInLdmSeqStore(rawSeqStore_t* ldmSeqStore, size_t n
ldmSeqStore->posInSequence += currSeq.litLength;
nbBytes -= currSeq.litLength;
}
if (nbBytes < currSeq.matchLength) {
ldmSeqStore->posInSequence += nbBytes;
return;

38
tests/fuzzer.c
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@ -780,6 +780,44 @@ static int basicUnitTests(U32 const seed, double compressibility)
}
DISPLAYLEVEL(3, "OK \n");
DISPLAYLEVEL(3, "test%3i : testing ldm no regressions in size for opt parser : ", testNb++);
{
size_t cSizeLdm;
size_t cSizeNoLdm;
ZSTD_CCtx* const cctx = ZSTD_createCCtx();
RDG_genBuffer(CNBuffer, CNBuffSize, 0.5, 0.5, seed);
/* Enable checksum to verify round trip. */
CHECK_Z(ZSTD_CCtx_setParameter(cctx, ZSTD_c_checksumFlag, 1));
CHECK_Z(ZSTD_CCtx_setParameter(cctx, ZSTD_c_enableLongDistanceMatching, 1));
CHECK_Z(ZSTD_CCtx_setParameter(cctx, ZSTD_c_compressionLevel, 19));
/* Round trip once with ldm. */
cSizeLdm = ZSTD_compress2(cctx, compressedBuffer, compressedBufferSize, CNBuffer, CNBuffSize);
CHECK_Z(cSizeLdm);
CHECK_Z(ZSTD_decompress(decodedBuffer, CNBuffSize, compressedBuffer, cSizeLdm));
ZSTD_CCtx_reset(cctx, ZSTD_reset_session_and_parameters);
CHECK_Z(ZSTD_CCtx_setParameter(cctx, ZSTD_c_checksumFlag, 1));
CHECK_Z(ZSTD_CCtx_setParameter(cctx, ZSTD_c_enableLongDistanceMatching, 0));
CHECK_Z(ZSTD_CCtx_setParameter(cctx, ZSTD_c_compressionLevel, 19));
/* Round trip once without ldm. */
cSizeNoLdm = ZSTD_compress2(cctx, compressedBuffer, compressedBufferSize, CNBuffer, CNBuffSize);
CHECK_Z(cSizeNoLdm);
CHECK_Z(ZSTD_decompress(decodedBuffer, CNBuffSize, compressedBuffer, cSizeNoLdm));
if (cSizeLdm > cSizeNoLdm) {
DISPLAY("Using long mode should not cause regressions for btopt+\n");
testResult = 1;
goto _output_error;
}
ZSTD_freeCCtx(cctx);
}
DISPLAYLEVEL(3, "OK \n");
/* Note: this test takes 0.5 seconds to run */
DISPLAYLEVEL(3, "test%3i : testing refPrefx vs refPrefx + ldm (size comparison) : ", testNb++);
{

2
tests/playTests.sh
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@ -1217,7 +1217,7 @@ then
println "\n===> zstdmt round-trip tests "
roundTripTest -g4M "1 -T0"
roundTripTest -g8M "3 -T2"
roundTripTest -g8M "3 -T0 --long"
roundTripTest -g8M "19 -T0 --long"
roundTripTest -g8000K "2 --threads=2"
fileRoundTripTest -g4M "19 -T2 -B1M"