ddidderr/zstd-rs
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Introduced FSE_compress_wksp() and FSE_buildCTable_wksp() to reduce stack memory usage

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This commit is contained in:
Yann Collet
2016-11-30 15:52:20 -08:00
parent 4ab3a4228f
commit d79a9a00d9
4 changed files with 90 additions and 55 deletions
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lib/compress/zstd_compress.c
+7 -6
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@@ -566,6 +566,7 @@ size_t ZSTD_compressSequences(ZSTD_CCtx* zc,
BYTE* op = ostart;
size_t const nbSeq = seqStorePtr->sequences - seqStorePtr->sequencesStart;
BYTE* seqHead;
BYTE scratchBuffer[1<<MAX(MLFSELog,LLFSELog)];
/* Compress literals */
{ const BYTE* const literals = seqStorePtr->litStart;
@@ -601,7 +602,7 @@ size_t ZSTD_compressSequences(ZSTD_CCtx* zc,
} else if ((zc->flagStaticTables) && (nbSeq < MAX_SEQ_FOR_STATIC_FSE)) {
LLtype = set_repeat;
} else if ((nbSeq < MIN_SEQ_FOR_DYNAMIC_FSE) || (mostFrequent < (nbSeq >> (LL_defaultNormLog-1)))) {
FSE_buildCTable(CTable_LitLength, LL_defaultNorm, MaxLL, LL_defaultNormLog);
FSE_buildCTable_wksp(CTable_LitLength, LL_defaultNorm, MaxLL, LL_defaultNormLog, scratchBuffer, sizeof(scratchBuffer));
LLtype = set_basic;
} else {
size_t nbSeq_1 = nbSeq;
@@ -611,7 +612,7 @@ size_t ZSTD_compressSequences(ZSTD_CCtx* zc,
{ size_t const NCountSize = FSE_writeNCount(op, oend-op, norm, max, tableLog); /* overflow protected */
if (FSE_isError(NCountSize)) return ERROR(GENERIC);
op += NCountSize; }
FSE_buildCTable(CTable_LitLength, norm, max, tableLog);
FSE_buildCTable_wksp(CTable_LitLength, norm, max, tableLog, scratchBuffer, sizeof(scratchBuffer));
LLtype = set_compressed;
} }
@@ -625,7 +626,7 @@ size_t ZSTD_compressSequences(ZSTD_CCtx* zc,
} else if ((zc->flagStaticTables) && (nbSeq < MAX_SEQ_FOR_STATIC_FSE)) {
Offtype = set_repeat;
} else if ((nbSeq < MIN_SEQ_FOR_DYNAMIC_FSE) || (mostFrequent < (nbSeq >> (OF_defaultNormLog-1)))) {
FSE_buildCTable(CTable_OffsetBits, OF_defaultNorm, MaxOff, OF_defaultNormLog);
FSE_buildCTable_wksp(CTable_OffsetBits, OF_defaultNorm, MaxOff, OF_defaultNormLog, scratchBuffer, sizeof(scratchBuffer));
Offtype = set_basic;
} else {
size_t nbSeq_1 = nbSeq;
@@ -635,7 +636,7 @@ size_t ZSTD_compressSequences(ZSTD_CCtx* zc,
{ size_t const NCountSize = FSE_writeNCount(op, oend-op, norm, max, tableLog); /* overflow protected */
if (FSE_isError(NCountSize)) return ERROR(GENERIC);
op += NCountSize; }
FSE_buildCTable(CTable_OffsetBits, norm, max, tableLog);
FSE_buildCTable_wksp(CTable_OffsetBits, norm, max, tableLog, scratchBuffer, sizeof(scratchBuffer));
Offtype = set_compressed;
} }
@@ -649,7 +650,7 @@ size_t ZSTD_compressSequences(ZSTD_CCtx* zc,
} else if ((zc->flagStaticTables) && (nbSeq < MAX_SEQ_FOR_STATIC_FSE)) {
MLtype = set_repeat;
} else if ((nbSeq < MIN_SEQ_FOR_DYNAMIC_FSE) || (mostFrequent < (nbSeq >> (ML_defaultNormLog-1)))) {
FSE_buildCTable(CTable_MatchLength, ML_defaultNorm, MaxML, ML_defaultNormLog);
FSE_buildCTable_wksp(CTable_MatchLength, ML_defaultNorm, MaxML, ML_defaultNormLog, scratchBuffer, sizeof(scratchBuffer));
MLtype = set_basic;
} else {
size_t nbSeq_1 = nbSeq;
@@ -659,7 +660,7 @@ size_t ZSTD_compressSequences(ZSTD_CCtx* zc,
{ size_t const NCountSize = FSE_writeNCount(op, oend-op, norm, max, tableLog); /* overflow protected */
if (FSE_isError(NCountSize)) return ERROR(GENERIC);
op += NCountSize; }
FSE_buildCTable(CTable_MatchLength, norm, max, tableLog);
FSE_buildCTable_wksp(CTable_MatchLength, norm, max, tableLog, scratchBuffer, sizeof(scratchBuffer));
MLtype = set_compressed;
} }