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record long offsets in ZSTD_symbolEncodingTypeStats_t + add test case

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This commit is contained in:
Danielle Rozenblit
2023-01-27 12:04:29 -08:00
parent d210628b0b
commit 9e4c66b9e9
4 changed files with 71 additions and 17 deletions
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lib/compress/zstd_compress.c
+10 -13
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@@ -1610,8 +1610,7 @@ static size_t ZSTD_estimateCCtxSize_usingCCtxParams_internal(
size_t const maxNbSeq = ZSTD_maxNbSeq(blockSize, cParams->minMatch, useExternalMatchFinder);
size_t const tokenSpace = ZSTD_cwksp_alloc_size(WILDCOPY_OVERLENGTH + blockSize)
+ ZSTD_cwksp_aligned_alloc_size(maxNbSeq * sizeof(seqDef))
+ 3 * ZSTD_cwksp_alloc_size(maxNbSeq * sizeof(BYTE))
+ ZSTD_cwksp_alloc_size(sizeof(BYTE)); /* longOffsets */
+ 3 * ZSTD_cwksp_alloc_size(maxNbSeq * sizeof(BYTE));
size_t const entropySpace = ZSTD_cwksp_alloc_size(ENTROPY_WORKSPACE_SIZE);
size_t const blockStateSpace = 2 * ZSTD_cwksp_alloc_size(sizeof(ZSTD_compressedBlockState_t));
size_t const matchStateSize = ZSTD_sizeof_matchState(cParams, useRowMatchFinder, /* enableDedicatedDictSearch */ 0, /* forCCtx */ 1);
@@ -2110,8 +2109,6 @@ static size_t ZSTD_resetCCtx_internal(ZSTD_CCtx* zc,
zc->seqStore.llCode = ZSTD_cwksp_reserve_buffer(ws, maxNbSeq * sizeof(BYTE));
zc->seqStore.mlCode = ZSTD_cwksp_reserve_buffer(ws, maxNbSeq * sizeof(BYTE));
zc->seqStore.ofCode = ZSTD_cwksp_reserve_buffer(ws, maxNbSeq * sizeof(BYTE));
zc->seqStore.longOffsets = ZSTD_cwksp_reserve_buffer(ws, sizeof(BYTE));
zc->seqStore.longOffsets[0] = 0;
zc->seqStore.sequencesStart = (seqDef*)ZSTD_cwksp_reserve_aligned(ws, maxNbSeq * sizeof(seqDef));
FORWARD_IF_ERROR(ZSTD_reset_matchState(
@@ -2562,16 +2559,15 @@ 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;
BYTE* const ofCodeTable = seqStorePtr->ofCode;
BYTE* const mlCodeTable = seqStorePtr->mlCode;
BYTE* const longOffsetsFlag = seqStorePtr->longOffsets;
U32 const nbSeq = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
U32 u;
BYTE longOffsets = 0;
int longOffsets = 0;
assert(nbSeq <= seqStorePtr->maxNbSeq);
for (u=0; u<nbSeq; u++) {
U32 const llv = sequences[u].litLength;
@@ -2582,11 +2578,11 @@ void ZSTD_seqToCodes(const seqStore_t* seqStorePtr)
mlCodeTable[u] = (BYTE)ZSTD_MLcode(mlv);
longOffsets |= (ofCode >= STREAM_ACCUMULATOR_MIN);
}
longOffsetsFlag[0] = longOffsets;
if (seqStorePtr->longLengthType==ZSTD_llt_literalLength)
llCodeTable[seqStorePtr->longLengthPos] = MaxLL;
if (seqStorePtr->longLengthType==ZSTD_llt_matchLength)
mlCodeTable[seqStorePtr->longLengthPos] = MaxML;
return longOffsets;
}
/* ZSTD_useTargetCBlockSize():
@@ -2620,6 +2616,7 @@ 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():
@@ -2650,7 +2647,7 @@ 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 */
@@ -2774,11 +2771,11 @@ ZSTD_entropyCompressSeqStore_internal(
const BYTE* const ofCodeTable = seqStorePtr->ofCode;
const BYTE* const llCodeTable = seqStorePtr->llCode;
const BYTE* const mlCodeTable = seqStorePtr->mlCode;
const BYTE* const longOffsetsFlag = seqStorePtr->longOffsets;
BYTE* const ostart = (BYTE*)dst;
BYTE* const oend = ostart + dstCapacity;
BYTE* op = ostart;
size_t lastCountSize;
int longOffsets = 0;
entropyWorkspace = count + (MaxSeq + 1);
entropyWkspSize -= (MaxSeq + 1) * sizeof(*count);
@@ -2840,10 +2837,10 @@ ZSTD_entropyCompressSeqStore_internal(
*seqHead = (BYTE)((stats.LLtype<<6) + (stats.Offtype<<4) + (stats.MLtype<<2));
lastCountSize = stats.lastCountSize;
op += stats.size;
longOffsets = stats.longOffsets;
}
{ const BYTE longOffsets = longOffsetsFlag[0];
size_t const bitstreamSize = ZSTD_encodeSequences(
{ size_t const bitstreamSize = ZSTD_encodeSequences(
op, (size_t)(oend - op),
CTable_MatchLength, mlCodeTable,
CTable_OffsetBits, ofCodeTable,
@@ -3485,7 +3482,7 @@ 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;