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Merge pull request #3460 from daniellerozenblit/fix-long-offsets-resolution-pointer

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fix long offset resolution
This commit is contained in:
daniellerozenblit
2023-01-30 14:02:51 -05:00
committed by GitHub
parent b3b43f2893 0843d9bedf
commit 00176638e3
5 changed files with 87 additions and 7 deletions
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lib/compress/zstd_compress.c
+13 -5
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@@ -2559,7 +2559,7 @@ static void ZSTD_reduceIndex (ZSTD_matchState_t* ms, ZSTD_CCtx_params const* par
/* See doc/zstd_compression_format.md for detailed format description */
void ZSTD_seqToCodes(const seqStore_t* seqStorePtr)
int ZSTD_seqToCodes(const seqStore_t* seqStorePtr)
{
const seqDef* const sequences = seqStorePtr->sequencesStart;
BYTE* const llCodeTable = seqStorePtr->llCode;
@@ -2567,18 +2567,24 @@ void ZSTD_seqToCodes(const seqStore_t* seqStorePtr)
BYTE* const mlCodeTable = seqStorePtr->mlCode;
U32 const nbSeq = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
U32 u;
int longOffsets = 0;
assert(nbSeq <= seqStorePtr->maxNbSeq);
for (u=0; u<nbSeq; u++) {
U32 const llv = sequences[u].litLength;
U32 const ofCode = ZSTD_highbit32(sequences[u].offBase);
U32 const mlv = sequences[u].mlBase;
llCodeTable[u] = (BYTE)ZSTD_LLcode(llv);
ofCodeTable[u] = (BYTE)ZSTD_highbit32(sequences[u].offBase);
ofCodeTable[u] = (BYTE)ofCode;
mlCodeTable[u] = (BYTE)ZSTD_MLcode(mlv);
assert(!(MEM_64bits() && ofCode >= STREAM_ACCUMULATOR_MIN));
if (MEM_32bits() && ofCode >= STREAM_ACCUMULATOR_MIN)
longOffsets = 1;
}
if (seqStorePtr->longLengthType==ZSTD_llt_literalLength)
llCodeTable[seqStorePtr->longLengthPos] = MaxLL;
if (seqStorePtr->longLengthType==ZSTD_llt_matchLength)
mlCodeTable[seqStorePtr->longLengthPos] = MaxML;
return longOffsets;
}
/* ZSTD_useTargetCBlockSize():
@@ -2612,6 +2618,7 @@ typedef struct {
U32 MLtype;
size_t size;
size_t lastCountSize; /* Accounts for bug in 1.3.4. More detail in ZSTD_entropyCompressSeqStore_internal() */
int longOffsets;
} ZSTD_symbolEncodingTypeStats_t;
/* ZSTD_buildSequencesStatistics():
@@ -2642,7 +2649,7 @@ ZSTD_buildSequencesStatistics(
stats.lastCountSize = 0;
/* convert length/distances into codes */
ZSTD_seqToCodes(seqStorePtr);
stats.longOffsets = ZSTD_seqToCodes(seqStorePtr);
assert(op <= oend);
assert(nbSeq != 0); /* ZSTD_selectEncodingType() divides by nbSeq */
/* build CTable for Literal Lengths */
@@ -2756,7 +2763,6 @@ ZSTD_entropyCompressSeqStore_internal(
void* entropyWorkspace, size_t entropyWkspSize,
const int bmi2)
{
const int longOffsets = cctxParams->cParams.windowLog >= STREAM_ACCUMULATOR_MIN;
ZSTD_strategy const strategy = cctxParams->cParams.strategy;
unsigned* count = (unsigned*)entropyWorkspace;
FSE_CTable* CTable_LitLength = nextEntropy->fse.litlengthCTable;
@@ -2771,6 +2777,7 @@ ZSTD_entropyCompressSeqStore_internal(
BYTE* const oend = ostart + dstCapacity;
BYTE* op = ostart;
size_t lastCountSize;
int longOffsets = 0;
entropyWorkspace = count + (MaxSeq + 1);
entropyWkspSize -= (MaxSeq + 1) * sizeof(*count);
@@ -2832,6 +2839,7 @@ ZSTD_entropyCompressSeqStore_internal(
*seqHead = (BYTE)((stats.LLtype<<6) + (stats.Offtype<<4) + (stats.MLtype<<2));
lastCountSize = stats.lastCountSize;
op += stats.size;
longOffsets = stats.longOffsets;
}
{ size_t const bitstreamSize = ZSTD_encodeSequences(
@@ -3476,7 +3484,7 @@ ZSTD_buildBlockEntropyStats_literals(void* const src, size_t srcSize,
static ZSTD_symbolEncodingTypeStats_t
ZSTD_buildDummySequencesStatistics(ZSTD_fseCTables_t* nextEntropy)
{
ZSTD_symbolEncodingTypeStats_t stats = {set_basic, set_basic, set_basic, 0, 0};
ZSTD_symbolEncodingTypeStats_t stats = {set_basic, set_basic, set_basic, 0, 0, 0};
nextEntropy->litlength_repeatMode = FSE_repeat_none;
nextEntropy->offcode_repeatMode = FSE_repeat_none;
nextEntropy->matchlength_repeatMode = FSE_repeat_none;