* entropyWkspSize must be of size at least ENTROPY_WORKSPACE_SIZE - (MaxSeq + 1)*sizeof(U32)
*/
static ZSTD_symbolEncodingTypeStats_t
-ZSTD_buildSequencesStatistics(seqStore_t* seqStorePtr, size_t nbSeq,
- const ZSTD_fseCTables_t* prevEntropy, ZSTD_fseCTables_t* nextEntropy,
- BYTE* dst, const BYTE* const dstEnd,
- ZSTD_strategy strategy, unsigned* countWorkspace,
- void* entropyWorkspace, size_t entropyWkspSize) {
+ZSTD_buildSequencesStatistics(
+ const seqStore_t* seqStorePtr, size_t nbSeq,
+ const ZSTD_fseCTables_t* prevEntropy, ZSTD_fseCTables_t* nextEntropy,
+ BYTE* dst, const BYTE* const dstEnd,
+ ZSTD_strategy strategy, unsigned* countWorkspace,
+ void* entropyWorkspace, size_t entropyWkspSize)
+{
BYTE* const ostart = dst;
const BYTE* const oend = dstEnd;
BYTE* op = ostart;
*/
#define SUSPECT_UNCOMPRESSIBLE_LITERAL_RATIO 20
MEM_STATIC size_t
-ZSTD_entropyCompressSeqStore_internal(seqStore_t* seqStorePtr,
- const ZSTD_entropyCTables_t* prevEntropy,
- ZSTD_entropyCTables_t* nextEntropy,
- const ZSTD_CCtx_params* cctxParams,
- void* dst, size_t dstCapacity,
- void* entropyWorkspace, size_t entropyWkspSize,
- const int bmi2)
+ZSTD_entropyCompressSeqStore_internal(
+ const seqStore_t* seqStorePtr,
+ const ZSTD_entropyCTables_t* prevEntropy,
+ ZSTD_entropyCTables_t* nextEntropy,
+ const ZSTD_CCtx_params* cctxParams,
+ void* dst, size_t dstCapacity,
+ void* entropyWorkspace, size_t entropyWkspSize,
+ const int bmi2)
{
const int longOffsets = cctxParams->cParams.windowLog >= STREAM_ACCUMULATOR_MIN;
ZSTD_strategy const strategy = cctxParams->cParams.strategy;
FSE_CTable* CTable_OffsetBits = nextEntropy->fse.offcodeCTable;
FSE_CTable* CTable_MatchLength = nextEntropy->fse.matchlengthCTable;
const seqDef* const sequences = seqStorePtr->sequencesStart;
- const size_t nbSeq = seqStorePtr->sequences - seqStorePtr->sequencesStart;
+ const size_t nbSeq = (size_t)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
const BYTE* const ofCodeTable = seqStorePtr->ofCode;
const BYTE* const llCodeTable = seqStorePtr->llCode;
const BYTE* const mlCodeTable = seqStorePtr->mlCode;
/* Compress literals */
{ const BYTE* const literals = seqStorePtr->litStart;
- size_t const numSequences = seqStorePtr->sequences - seqStorePtr->sequencesStart;
- size_t const numLiterals = seqStorePtr->lit - seqStorePtr->litStart;
+ size_t const numSequences = (size_t)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
+ size_t const numLiterals = (size_t)(seqStorePtr->lit - seqStorePtr->litStart);
/* Base suspicion of uncompressibility on ratio of literals to sequences */
unsigned const suspectUncompressible = (numSequences == 0) || (numLiterals / numSequences >= SUSPECT_UNCOMPRESSIBLE_LITERAL_RATIO);
size_t const litSize = (size_t)(seqStorePtr->lit - literals);
}
MEM_STATIC size_t
-ZSTD_entropyCompressSeqStore(seqStore_t* seqStorePtr,
- const ZSTD_entropyCTables_t* prevEntropy,
- ZSTD_entropyCTables_t* nextEntropy,
- const ZSTD_CCtx_params* cctxParams,
- void* dst, size_t dstCapacity,
- size_t srcSize,
- void* entropyWorkspace, size_t entropyWkspSize,
- int bmi2)
+ZSTD_entropyCompressSeqStore(
+ const seqStore_t* seqStorePtr,
+ const ZSTD_entropyCTables_t* prevEntropy,
+ ZSTD_entropyCTables_t* nextEntropy,
+ const ZSTD_CCtx_params* cctxParams,
+ void* dst, size_t dstCapacity,
+ size_t srcSize,
+ void* entropyWorkspace, size_t entropyWkspSize,
+ int bmi2)
{
size_t const cSize = ZSTD_entropyCompressSeqStore_internal(
seqStorePtr, prevEntropy, nextEntropy, cctxParams,
const size_t unrollMask = unrollSize - 1;
const size_t prefixLength = length & unrollMask;
size_t i;
- size_t u;
if (length == 1) return 1;
/* Check if prefix is RLE first before using unrolled loop */
if (prefixLength && ZSTD_count(ip+1, ip, ip+prefixLength) != prefixLength-1) {
return 0;
}
for (i = prefixLength; i != length; i += unrollSize) {
+ size_t u;
for (u = 0; u < unrollSize; u += sizeof(size_t)) {
if (MEM_readST(ip + i + u) != valueST) {
return 0;
- }
- }
- }
+ } } }
return 1;
}
return nbSeqs < 4 && nbLits < 10;
}
-static void ZSTD_blockState_confirmRepcodesAndEntropyTables(ZSTD_blockState_t* const bs)
+static void
+ZSTD_blockState_confirmRepcodesAndEntropyTables(ZSTD_blockState_t* const bs)
{
ZSTD_compressedBlockState_t* const tmp = bs->prevCBlock;
bs->prevCBlock = bs->nextCBlock;
}
/* Writes the block header */
-static void writeBlockHeader(void* op, size_t cSize, size_t blockSize, U32 lastBlock) {
+static void
+writeBlockHeader(void* op, size_t cSize, size_t blockSize, U32 lastBlock)
+{
U32 const cBlockHeader = cSize == 1 ?
lastBlock + (((U32)bt_rle)<<1) + (U32)(blockSize << 3) :
lastBlock + (((U32)bt_compressed)<<1) + (U32)(cSize << 3);
* Stores literals block type (raw, rle, compressed, repeat) and
* huffman description table to hufMetadata.
* Requires ENTROPY_WORKSPACE_SIZE workspace
- * @return : size of huffman description table or error code */
-static size_t ZSTD_buildBlockEntropyStats_literals(void* const src, size_t srcSize,
- const ZSTD_hufCTables_t* prevHuf,
- ZSTD_hufCTables_t* nextHuf,
- ZSTD_hufCTablesMetadata_t* hufMetadata,
- const int literalsCompressionIsDisabled,
- void* workspace, size_t wkspSize, HUF_depth_mode depthMode)
+ * @return : size of huffman description table, or an error code
+ */
+static size_t
+ZSTD_buildBlockEntropyStats_literals(void* const src, size_t srcSize,
+ const ZSTD_hufCTables_t* prevHuf,
+ ZSTD_hufCTables_t* nextHuf,
+ ZSTD_hufCTablesMetadata_t* hufMetadata,
+ const int literalsCompressionIsDisabled,
+ void* workspace, size_t wkspSize,
+ HUF_depth_mode depthMode)
{
BYTE* const wkspStart = (BYTE*)workspace;
BYTE* const wkspEnd = wkspStart + wkspSize;
/* small ? don't even attempt compression (speed opt) */
#ifndef COMPRESS_LITERALS_SIZE_MIN
-#define COMPRESS_LITERALS_SIZE_MIN 63
+# define COMPRESS_LITERALS_SIZE_MIN 63 /* heuristic */
#endif
{ size_t const minLitSize = (prevHuf->repeatMode == HUF_repeat_valid) ? 6 : COMPRESS_LITERALS_SIZE_MIN;
if (srcSize <= minLitSize) {
DEBUGLOG(5, "set_basic - too small");
hufMetadata->hType = set_basic;
return 0;
- }
- }
+ } }
/* Scan input and build symbol stats */
- { size_t const largest = HIST_count_wksp (countWksp, &maxSymbolValue, (const BYTE*)src, srcSize, workspace, wkspSize);
+ { size_t const largest =
+ HIST_count_wksp (countWksp, &maxSymbolValue,
+ (const BYTE*)src, srcSize,
+ workspace, wkspSize);
FORWARD_IF_ERROR(largest, "HIST_count_wksp failed");
if (largest == srcSize) {
+ /* only one literal symbol */
DEBUGLOG(5, "set_rle");
hufMetadata->hType = set_rle;
return 0;
}
if (largest <= (srcSize >> 7)+4) {
+ /* heuristic: likely not compressible */
DEBUGLOG(5, "set_basic - no gain");
hufMetadata->hType = set_basic;
return 0;
- }
- }
+ } }
/* Validate the previous Huffman table */
- if (repeat == HUF_repeat_check && !HUF_validateCTable((HUF_CElt const*)prevHuf->CTable, countWksp, maxSymbolValue)) {
+ if (repeat == HUF_repeat_check
+ && !HUF_validateCTable((HUF_CElt const*)prevHuf->CTable, countWksp, maxSymbolValue)) {
repeat = HUF_repeat_none;
}
nodeWksp, nodeWkspSize);
FORWARD_IF_ERROR(maxBits, "HUF_buildCTable_wksp");
huffLog = (U32)maxBits;
- { /* Build and write the CTable */
- size_t const newCSize = HUF_estimateCompressedSize(
- (HUF_CElt*)nextHuf->CTable, countWksp, maxSymbolValue);
- size_t const hSize = HUF_writeCTable_wksp(
- hufMetadata->hufDesBuffer, sizeof(hufMetadata->hufDesBuffer),
- (HUF_CElt*)nextHuf->CTable, maxSymbolValue, huffLog,
- nodeWksp, nodeWkspSize);
- /* Check against repeating the previous CTable */
- if (repeat != HUF_repeat_none) {
- size_t const oldCSize = HUF_estimateCompressedSize(
- (HUF_CElt const*)prevHuf->CTable, countWksp, maxSymbolValue);
- if (oldCSize < srcSize && (oldCSize <= hSize + newCSize || hSize + 12 >= srcSize)) {
- DEBUGLOG(5, "set_repeat - smaller");
- ZSTD_memcpy(nextHuf, prevHuf, sizeof(*prevHuf));
- hufMetadata->hType = set_repeat;
- return 0;
- }
- }
- if (newCSize + hSize >= srcSize) {
- DEBUGLOG(5, "set_basic - no gains");
+ }
+ { /* Build and write the CTable */
+ size_t const newCSize = HUF_estimateCompressedSize(
+ (HUF_CElt*)nextHuf->CTable, countWksp, maxSymbolValue);
+ size_t const hSize = HUF_writeCTable_wksp(
+ hufMetadata->hufDesBuffer, sizeof(hufMetadata->hufDesBuffer),
+ (HUF_CElt*)nextHuf->CTable, maxSymbolValue, huffLog,
+ nodeWksp, nodeWkspSize);
+ /* Check against repeating the previous CTable */
+ if (repeat != HUF_repeat_none) {
+ size_t const oldCSize = HUF_estimateCompressedSize(
+ (HUF_CElt const*)prevHuf->CTable, countWksp, maxSymbolValue);
+ if (oldCSize < srcSize && (oldCSize <= hSize + newCSize || hSize + 12 >= srcSize)) {
+ DEBUGLOG(5, "set_repeat - smaller");
ZSTD_memcpy(nextHuf, prevHuf, sizeof(*prevHuf));
- hufMetadata->hType = set_basic;
+ hufMetadata->hType = set_repeat;
return 0;
- }
- DEBUGLOG(5, "set_compressed (hSize=%u)", (U32)hSize);
- hufMetadata->hType = set_compressed;
- nextHuf->repeatMode = HUF_repeat_check;
- return hSize;
+ } }
+ if (newCSize + hSize >= srcSize) {
+ DEBUGLOG(5, "set_basic - no gains");
+ ZSTD_memcpy(nextHuf, prevHuf, sizeof(*prevHuf));
+ hufMetadata->hType = set_basic;
+ return 0;
}
+ DEBUGLOG(5, "set_compressed (hSize=%u)", (U32)hSize);
+ hufMetadata->hType = set_compressed;
+ nextHuf->repeatMode = HUF_repeat_check;
+ return hSize;
}
}
* and updates nextEntropy to the appropriate repeatMode.
*/
static ZSTD_symbolEncodingTypeStats_t
-ZSTD_buildDummySequencesStatistics(ZSTD_fseCTables_t* nextEntropy) {
+ZSTD_buildDummySequencesStatistics(ZSTD_fseCTables_t* nextEntropy)
+{
ZSTD_symbolEncodingTypeStats_t stats = {set_basic, set_basic, set_basic, 0, 0};
nextEntropy->litlength_repeatMode = FSE_repeat_none;
nextEntropy->offcode_repeatMode = FSE_repeat_none;
* Builds entropy for the sequences.
* Stores symbol compression modes and fse table to fseMetadata.
* Requires ENTROPY_WORKSPACE_SIZE wksp.
- * @return : size of fse tables or error code */
-static size_t ZSTD_buildBlockEntropyStats_sequences(seqStore_t* seqStorePtr,
- const ZSTD_fseCTables_t* prevEntropy,
- ZSTD_fseCTables_t* nextEntropy,
- const ZSTD_CCtx_params* cctxParams,
- ZSTD_fseCTablesMetadata_t* fseMetadata,
- void* workspace, size_t wkspSize)
+ * @return : size of fse tables or error code */
+static size_t
+ZSTD_buildBlockEntropyStats_sequences(
+ const seqStore_t* seqStorePtr,
+ const ZSTD_fseCTables_t* prevEntropy,
+ ZSTD_fseCTables_t* nextEntropy,
+ const ZSTD_CCtx_params* cctxParams,
+ ZSTD_fseCTablesMetadata_t* fseMetadata,
+ void* workspace, size_t wkspSize)
{
ZSTD_strategy const strategy = cctxParams->cParams.strategy;
- size_t const nbSeq = seqStorePtr->sequences - seqStorePtr->sequencesStart;
+ size_t const nbSeq = (size_t)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
BYTE* const ostart = fseMetadata->fseTablesBuffer;
BYTE* const oend = ostart + sizeof(fseMetadata->fseTablesBuffer);
BYTE* op = ostart;
/** ZSTD_buildBlockEntropyStats() :
* Builds entropy for the block.
* Requires workspace size ENTROPY_WORKSPACE_SIZE
- *
- * @return : 0 on success or error code
+ * @return : 0 on success, or an error code
+ * Note : also employed in superblock
*/
-size_t ZSTD_buildBlockEntropyStats(seqStore_t* seqStorePtr,
- const ZSTD_entropyCTables_t* prevEntropy,
- ZSTD_entropyCTables_t* nextEntropy,
- const ZSTD_CCtx_params* cctxParams,
- ZSTD_entropyCTablesMetadata_t* entropyMetadata,
- void* workspace, size_t wkspSize)
-{
- size_t const litSize = seqStorePtr->lit - seqStorePtr->litStart;
- HUF_depth_mode depthMode = cctxParams->cParams.strategy >= HUF_OPTIMAL_DEPTH_THRESHOLD ? HUF_depth_optimal : HUF_depth_fast;
+size_t ZSTD_buildBlockEntropyStats(
+ const seqStore_t* seqStorePtr,
+ const ZSTD_entropyCTables_t* prevEntropy,
+ ZSTD_entropyCTables_t* nextEntropy,
+ const ZSTD_CCtx_params* cctxParams,
+ ZSTD_entropyCTablesMetadata_t* entropyMetadata,
+ void* workspace, size_t wkspSize)
+{
+ size_t const litSize = (size_t)(seqStorePtr->lit - seqStorePtr->litStart);
+ int const huf_useOptDepth = (cctxParams->cParams.strategy >= HUF_OPTIMAL_DEPTH_THRESHOLD);
+ HUF_depth_mode const depthMode = huf_useOptDepth ? HUF_depth_optimal : HUF_depth_fast;
entropyMetadata->hufMetadata.hufDesSize =
ZSTD_buildBlockEntropyStats_literals(seqStorePtr->litStart, litSize,
}
/* Returns the size estimate for the literals section (header + content) of a block */
-static size_t ZSTD_estimateBlockSize_literal(const BYTE* literals, size_t litSize,
- const ZSTD_hufCTables_t* huf,
- const ZSTD_hufCTablesMetadata_t* hufMetadata,
- void* workspace, size_t wkspSize,
- int writeEntropy)
+static size_t
+ZSTD_estimateBlockSize_literal(const BYTE* literals, size_t litSize,
+ const ZSTD_hufCTables_t* huf,
+ const ZSTD_hufCTablesMetadata_t* hufMetadata,
+ void* workspace, size_t wkspSize,
+ int writeEntropy)
{
unsigned* const countWksp = (unsigned*)workspace;
unsigned maxSymbolValue = HUF_SYMBOLVALUE_MAX;
}
/* Returns the size estimate for the FSE-compressed symbols (of, ml, ll) of a block */
-static size_t ZSTD_estimateBlockSize_symbolType(symbolEncodingType_e type,
- const BYTE* codeTable, size_t nbSeq, unsigned maxCode,
- const FSE_CTable* fseCTable,
- const U8* additionalBits,
- short const* defaultNorm, U32 defaultNormLog, U32 defaultMax,
- void* workspace, size_t wkspSize)
+static size_t
+ZSTD_estimateBlockSize_symbolType(symbolEncodingType_e type,
+ const BYTE* codeTable, size_t nbSeq, unsigned maxCode,
+ const FSE_CTable* fseCTable,
+ const U8* additionalBits,
+ short const* defaultNorm, U32 defaultNormLog, U32 defaultMax,
+ void* workspace, size_t wkspSize)
{
unsigned* const countWksp = (unsigned*)workspace;
const BYTE* ctp = codeTable;
}
/* Returns the size estimate for the sequences section (header + content) of a block */
-static size_t ZSTD_estimateBlockSize_sequences(const BYTE* ofCodeTable,
- const BYTE* llCodeTable,
- const BYTE* mlCodeTable,
- size_t nbSeq,
- const ZSTD_fseCTables_t* fseTables,
- const ZSTD_fseCTablesMetadata_t* fseMetadata,
- void* workspace, size_t wkspSize,
- int writeEntropy)
+static size_t
+ZSTD_estimateBlockSize_sequences(const BYTE* ofCodeTable,
+ const BYTE* llCodeTable,
+ const BYTE* mlCodeTable,
+ size_t nbSeq,
+ const ZSTD_fseCTables_t* fseTables,
+ const ZSTD_fseCTablesMetadata_t* fseMetadata,
+ void* workspace, size_t wkspSize,
+ int writeEntropy)
{
size_t sequencesSectionHeaderSize = 1 /* seqHead */ + 1 /* min seqSize size */ + (nbSeq >= 128) + (nbSeq >= LONGNBSEQ);
size_t cSeqSizeEstimate = 0;
cSeqSizeEstimate += ZSTD_estimateBlockSize_symbolType(fseMetadata->ofType, ofCodeTable, nbSeq, MaxOff,
- fseTables->offcodeCTable, NULL,
- OF_defaultNorm, OF_defaultNormLog, DefaultMaxOff,
- workspace, wkspSize);
+ fseTables->offcodeCTable, NULL,
+ OF_defaultNorm, OF_defaultNormLog, DefaultMaxOff,
+ workspace, wkspSize);
cSeqSizeEstimate += ZSTD_estimateBlockSize_symbolType(fseMetadata->llType, llCodeTable, nbSeq, MaxLL,
- fseTables->litlengthCTable, LL_bits,
- LL_defaultNorm, LL_defaultNormLog, MaxLL,
- workspace, wkspSize);
+ fseTables->litlengthCTable, LL_bits,
+ LL_defaultNorm, LL_defaultNormLog, MaxLL,
+ workspace, wkspSize);
cSeqSizeEstimate += ZSTD_estimateBlockSize_symbolType(fseMetadata->mlType, mlCodeTable, nbSeq, MaxML,
- fseTables->matchlengthCTable, ML_bits,
- ML_defaultNorm, ML_defaultNormLog, MaxML,
- workspace, wkspSize);
+ fseTables->matchlengthCTable, ML_bits,
+ ML_defaultNorm, ML_defaultNormLog, MaxML,
+ workspace, wkspSize);
if (writeEntropy) cSeqSizeEstimate += fseMetadata->fseTablesSize;
return cSeqSizeEstimate + sequencesSectionHeaderSize;
}
/* Returns the size estimate for a given stream of literals, of, ll, ml */
-static size_t ZSTD_estimateBlockSize(const BYTE* literals, size_t litSize,
- const BYTE* ofCodeTable,
- const BYTE* llCodeTable,
- const BYTE* mlCodeTable,
- size_t nbSeq,
- const ZSTD_entropyCTables_t* entropy,
- const ZSTD_entropyCTablesMetadata_t* entropyMetadata,
- void* workspace, size_t wkspSize,
- int writeLitEntropy, int writeSeqEntropy) {
+static size_t
+ZSTD_estimateBlockSize(const BYTE* literals, size_t litSize,
+ const BYTE* ofCodeTable,
+ const BYTE* llCodeTable,
+ const BYTE* mlCodeTable,
+ size_t nbSeq,
+ const ZSTD_entropyCTables_t* entropy,
+ const ZSTD_entropyCTablesMetadata_t* entropyMetadata,
+ void* workspace, size_t wkspSize,
+ int writeLitEntropy, int writeSeqEntropy)
+{
size_t const literalsSize = ZSTD_estimateBlockSize_literal(literals, litSize,
- &entropy->huf, &entropyMetadata->hufMetadata,
- workspace, wkspSize, writeLitEntropy);
+ &entropy->huf, &entropyMetadata->hufMetadata,
+ workspace, wkspSize, writeLitEntropy);
size_t const seqSize = ZSTD_estimateBlockSize_sequences(ofCodeTable, llCodeTable, mlCodeTable,
- nbSeq, &entropy->fse, &entropyMetadata->fseMetadata,
- workspace, wkspSize, writeSeqEntropy);
+ nbSeq, &entropy->fse, &entropyMetadata->fseMetadata,
+ workspace, wkspSize, writeSeqEntropy);
return seqSize + literalsSize + ZSTD_blockHeaderSize;
}
/* Builds entropy statistics and uses them for blocksize estimation.
*
- * Returns the estimated compressed size of the seqStore, or a zstd error.
+ * @return: estimated compressed size of the seqStore, or a zstd error.
*/
-static size_t ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize(seqStore_t* seqStore, ZSTD_CCtx* zc) {
- ZSTD_entropyCTablesMetadata_t* entropyMetadata = &zc->blockSplitCtx.entropyMetadata;
+static size_t
+ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize(seqStore_t* seqStore, ZSTD_CCtx* zc)
+{
+ ZSTD_entropyCTablesMetadata_t* const entropyMetadata = &zc->blockSplitCtx.entropyMetadata;
DEBUGLOG(6, "ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize()");
FORWARD_IF_ERROR(ZSTD_buildBlockEntropyStats(seqStore,
&zc->blockState.prevCBlock->entropy,
&zc->blockState.nextCBlock->entropy,
&zc->appliedParams,
entropyMetadata,
- zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE /* statically allocated in resetCCtx */), "");
- return ZSTD_estimateBlockSize(seqStore->litStart, (size_t)(seqStore->lit - seqStore->litStart),
+ zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE), "");
+ return ZSTD_estimateBlockSize(
+ seqStore->litStart, (size_t)(seqStore->lit - seqStore->litStart),
seqStore->ofCode, seqStore->llCode, seqStore->mlCode,
(size_t)(seqStore->sequences - seqStore->sequencesStart),
- &zc->blockState.nextCBlock->entropy, entropyMetadata, zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE,
+ &zc->blockState.nextCBlock->entropy,
+ entropyMetadata,
+ zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE,
(int)(entropyMetadata->hufMetadata.hType == set_compressed), 1);
}
/* Returns literals bytes represented in a seqStore */
-static size_t ZSTD_countSeqStoreLiteralsBytes(const seqStore_t* const seqStore) {
+static size_t ZSTD_countSeqStoreLiteralsBytes(const seqStore_t* const seqStore)
+{
size_t literalsBytes = 0;
- size_t const nbSeqs = seqStore->sequences - seqStore->sequencesStart;
+ size_t const nbSeqs = (size_t)(seqStore->sequences - seqStore->sequencesStart);
size_t i;
for (i = 0; i < nbSeqs; ++i) {
- seqDef seq = seqStore->sequencesStart[i];
+ seqDef const seq = seqStore->sequencesStart[i];
literalsBytes += seq.litLength;
if (i == seqStore->longLengthPos && seqStore->longLengthType == ZSTD_llt_literalLength) {
literalsBytes += 0x10000;
- }
- }
+ } }
return literalsBytes;
}
/* Returns match bytes represented in a seqStore */
-static size_t ZSTD_countSeqStoreMatchBytes(const seqStore_t* const seqStore) {
+static size_t ZSTD_countSeqStoreMatchBytes(const seqStore_t* const seqStore)
+{
size_t matchBytes = 0;
- size_t const nbSeqs = seqStore->sequences - seqStore->sequencesStart;
+ size_t const nbSeqs = (size_t)(seqStore->sequences - seqStore->sequencesStart);
size_t i;
for (i = 0; i < nbSeqs; ++i) {
seqDef seq = seqStore->sequencesStart[i];
matchBytes += seq.mlBase + MINMATCH;
if (i == seqStore->longLengthPos && seqStore->longLengthType == ZSTD_llt_matchLength) {
matchBytes += 0x10000;
- }
- }
+ } }
return matchBytes;
}
U32 const adjustedRepCode = OFFBASE_TO_REPCODE(offBase) - 1 + ll0; /* [ 0 - 3 ] */
assert(OFFBASE_IS_REPCODE(offBase));
if (adjustedRepCode == ZSTD_REP_NUM) {
+ assert(ll0);
/* litlength == 0 and offCode == 2 implies selection of first repcode - 1
* This is only valid if it results in a valid offset value, aka > 0.
* Note : it may happen that `rep[0]==1` in exceptional circumstances.
* 1-3 : repcode 1-3
* 4+ : real_offset+3
*/
-static void ZSTD_seqStore_resolveOffCodes(repcodes_t* const dRepcodes, repcodes_t* const cRepcodes,
- seqStore_t* const seqStore, U32 const nbSeq) {
+static void
+ZSTD_seqStore_resolveOffCodes(repcodes_t* const dRepcodes, repcodes_t* const cRepcodes,
+ const seqStore_t* const seqStore, U32 const nbSeq)
+{
U32 idx = 0;
for (; idx < nbSeq; ++idx) {
seqDef* const seq = seqStore->sequencesStart + idx;
U32 const ll0 = (seq->litLength == 0);
U32 const offBase = seq->offBase;
- assert(seq->offBase > 0);
+ assert(offBase > 0);
if (OFFBASE_IS_REPCODE(offBase)) {
U32 const dRawOffset = ZSTD_resolveRepcodeToRawOffset(dRepcodes->rep, offBase, ll0);
U32 const cRawOffset = ZSTD_resolveRepcodeToRawOffset(cRepcodes->rep, offBase, ll0);
* repcode history.
*/
if (dRawOffset != cRawOffset) {
- seq->offBase = cRawOffset + ZSTD_REP_NUM;
+ seq->offBase = OFFSET_TO_OFFBASE(cRawOffset);
}
}
/* Compression repcode history is always updated with values directly from the unmodified seqStore.
* Returns the total size of that block (including header) or a ZSTD error code.
*/
static size_t
-ZSTD_compressSeqStore_singleBlock(ZSTD_CCtx* zc, seqStore_t* const seqStore,
+ZSTD_compressSeqStore_singleBlock(ZSTD_CCtx* zc,
+ const seqStore_t* const seqStore,
repcodes_t* const dRep, repcodes_t* const cRep,
void* dst, size_t dstCapacity,
- const void* src, size_t srcSize,
+ const void* src, size_t srcSize,
U32 lastBlock, U32 isPartition)
{
const U32 rleMaxLength = 25;
/* Helper function to perform the recursive search for block splits.
* Estimates the cost of seqStore prior to split, and estimates the cost of splitting the sequences in half.
- * If advantageous to split, then we recurse down the two sub-blocks. If not, or if an error occurred in estimation, then
- * we do not recurse.
+ * If advantageous to split, then we recurse down the two sub-blocks.
+ * If not, or if an error occurred in estimation, then we do not recurse.
*
- * Note: The recursion depth is capped by a heuristic minimum number of sequences, defined by MIN_SEQUENCES_BLOCK_SPLITTING.
+ * Note: The recursion depth is capped by a heuristic minimum number of sequences,
+ * defined by MIN_SEQUENCES_BLOCK_SPLITTING.
* In theory, this means the absolute largest recursion depth is 10 == log2(maxNbSeqInBlock/MIN_SEQUENCES_BLOCK_SPLITTING).
* In practice, recursion depth usually doesn't go beyond 4.
*
ZSTD_deriveBlockSplitsHelper(seqStoreSplits* splits, size_t startIdx, size_t endIdx,
ZSTD_CCtx* zc, const seqStore_t* origSeqStore)
{
- seqStore_t* fullSeqStoreChunk = &zc->blockSplitCtx.fullSeqStoreChunk;
- seqStore_t* firstHalfSeqStore = &zc->blockSplitCtx.firstHalfSeqStore;
- seqStore_t* secondHalfSeqStore = &zc->blockSplitCtx.secondHalfSeqStore;
+ seqStore_t* const fullSeqStoreChunk = &zc->blockSplitCtx.fullSeqStoreChunk;
+ seqStore_t* const firstHalfSeqStore = &zc->blockSplitCtx.firstHalfSeqStore;
+ seqStore_t* const secondHalfSeqStore = &zc->blockSplitCtx.secondHalfSeqStore;
size_t estimatedOriginalSize;
size_t estimatedFirstHalfSize;
size_t estimatedSecondHalfSize;
size_t midIdx = (startIdx + endIdx)/2;
+ assert(endIdx >= startIdx);
if (endIdx - startIdx < MIN_SEQUENCES_BLOCK_SPLITTING || splits->idx >= ZSTD_MAX_NB_BLOCK_SPLITS) {
- DEBUGLOG(6, "ZSTD_deriveBlockSplitsHelper: Too few sequences");
+ DEBUGLOG(6, "ZSTD_deriveBlockSplitsHelper: Too few sequences (%zu)", endIdx - startIdx);
return;
}
DEBUGLOG(5, "ZSTD_deriveBlockSplitsHelper: startIdx=%zu endIdx=%zu", startIdx, endIdx);
}
}
-/* Base recursive function. Populates a table with intra-block partition indices that can improve compression ratio.
+/* Base recursive function.
+ * Populates a table with intra-block partition indices that can improve compression ratio.
*
- * Returns the number of splits made (which equals the size of the partition table - 1).
+ * @return: number of splits made (which equals the size of the partition table - 1).
*/
static size_t ZSTD_deriveBlockSplits(ZSTD_CCtx* zc, U32 partitions[], U32 nbSeq)
{
seqStoreSplits splits = {partitions, 0};
if (nbSeq <= 4) {
- DEBUGLOG(5, "ZSTD_deriveBlockSplits: Too few sequences to split");
+ DEBUGLOG(5, "ZSTD_deriveBlockSplits: Too few sequences to split (%u <= 4)", nbSeq);
/* Refuse to try and split anything with less than 4 sequences */
return 0;
}
* Returns combined size of all blocks (which includes headers), or a ZSTD error code.
*/
static size_t
-ZSTD_compressBlock_splitBlock_internal(ZSTD_CCtx* zc, void* dst, size_t dstCapacity,
- const void* src, size_t blockSize, U32 lastBlock, U32 nbSeq)
+ZSTD_compressBlock_splitBlock_internal(ZSTD_CCtx* zc,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t blockSize,
+ U32 lastBlock, U32 nbSeq)
{
size_t cSize = 0;
const BYTE* ip = (const BYTE*)src;
BYTE* op = (BYTE*)dst;
size_t i = 0;
size_t srcBytesTotal = 0;
- U32* partitions = zc->blockSplitCtx.partitions; /* size == ZSTD_MAX_NB_BLOCK_SPLITS */
- seqStore_t* nextSeqStore = &zc->blockSplitCtx.nextSeqStore;
- seqStore_t* currSeqStore = &zc->blockSplitCtx.currSeqStore;
- size_t numSplits = ZSTD_deriveBlockSplits(zc, partitions, nbSeq);
+ U32* const partitions = zc->blockSplitCtx.partitions; /* size == ZSTD_MAX_NB_BLOCK_SPLITS */
+ seqStore_t* const nextSeqStore = &zc->blockSplitCtx.nextSeqStore;
+ seqStore_t* const currSeqStore = &zc->blockSplitCtx.currSeqStore;
+ size_t const numSplits = ZSTD_deriveBlockSplits(zc, partitions, nbSeq);
/* If a block is split and some partitions are emitted as RLE/uncompressed, then repcode history
* may become invalid. In order to reconcile potentially invalid repcodes, we keep track of two
ZSTD_memcpy(cRep.rep, zc->blockState.prevCBlock->rep, sizeof(repcodes_t));
ZSTD_memset(nextSeqStore, 0, sizeof(seqStore_t));
- DEBUGLOG(4, "ZSTD_compressBlock_splitBlock_internal (dstCapacity=%u, dictLimit=%u, nextToUpdate=%u)",
+ DEBUGLOG(5, "ZSTD_compressBlock_splitBlock_internal (dstCapacity=%u, dictLimit=%u, nextToUpdate=%u)",
(unsigned)dstCapacity, (unsigned)zc->blockState.matchState.window.dictLimit,
(unsigned)zc->blockState.matchState.nextToUpdate);
if (numSplits == 0) {
- size_t cSizeSingleBlock = ZSTD_compressSeqStore_singleBlock(zc, &zc->seqStore,
- &dRep, &cRep,
- op, dstCapacity,
- ip, blockSize,
- lastBlock, 0 /* isPartition */);
+ size_t cSizeSingleBlock =
+ ZSTD_compressSeqStore_singleBlock(zc, &zc->seqStore,
+ &dRep, &cRep,
+ op, dstCapacity,
+ ip, blockSize,
+ lastBlock, 0 /* isPartition */);
FORWARD_IF_ERROR(cSizeSingleBlock, "Compressing single block from splitBlock_internal() failed!");
DEBUGLOG(5, "ZSTD_compressBlock_splitBlock_internal: No splits");
- assert(cSizeSingleBlock <= ZSTD_BLOCKSIZE_MAX + ZSTD_blockHeaderSize);
+ assert(zc->blockSize <= ZSTD_BLOCKSIZE_MAX);
+ assert(cSizeSingleBlock <= zc->blockSize + ZSTD_blockHeaderSize);
return cSizeSingleBlock;
}
op, dstCapacity,
ip, srcBytes,
lastBlockEntireSrc, 1 /* isPartition */);
- DEBUGLOG(5, "Estimated size: %zu actual size: %zu", ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize(currSeqStore, zc), cSizeChunk);
+ DEBUGLOG(5, "Estimated size: %zu vs %zu : actual size",
+ ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize(currSeqStore, zc), cSizeChunk);
FORWARD_IF_ERROR(cSizeChunk, "Compressing chunk failed!");
ip += srcBytes;
dstCapacity -= cSizeChunk;
cSize += cSizeChunk;
*currSeqStore = *nextSeqStore;
- assert(cSizeChunk <= ZSTD_BLOCKSIZE_MAX + ZSTD_blockHeaderSize);
+ assert(cSizeChunk <= zc->blockSize + ZSTD_blockHeaderSize);
}
- /* cRep and dRep may have diverged during the compression. If so, we use the dRep repcodes
- * for the next block.
+ /* cRep and dRep may have diverged during the compression.
+ * If so, we use the dRep repcodes for the next block.
*/
ZSTD_memcpy(zc->blockState.prevCBlock->rep, dRep.rep, sizeof(repcodes_t));
return cSize;
void* dst, size_t dstCapacity,
const void* src, size_t srcSize, U32 lastBlock)
{
- const BYTE* ip = (const BYTE*)src;
- BYTE* op = (BYTE*)dst;
U32 nbSeq;
size_t cSize;
DEBUGLOG(4, "ZSTD_compressBlock_splitBlock");
if (bss == ZSTDbss_noCompress) {
if (zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid)
zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check;
- cSize = ZSTD_noCompressBlock(op, dstCapacity, ip, srcSize, lastBlock);
+ cSize = ZSTD_noCompressBlock(dst, dstCapacity, src, srcSize, lastBlock);
FORWARD_IF_ERROR(cSize, "ZSTD_noCompressBlock failed");
DEBUGLOG(4, "ZSTD_compressBlock_splitBlock: Nocompress block");
return cSize;
* * cSize >= blockBound(srcSize): We have expanded the block too much so
* emit an uncompressed block.
*/
- {
- size_t const cSize = ZSTD_compressSuperBlock(zc, dst, dstCapacity, src, srcSize, lastBlock);
+ { size_t const cSize =
+ ZSTD_compressSuperBlock(zc, dst, dstCapacity, src, srcSize, lastBlock);
if (cSize != ERROR(dstSize_tooSmall)) {
- size_t const maxCSize = srcSize - ZSTD_minGain(srcSize, zc->appliedParams.cParams.strategy);
+ size_t const maxCSize =
+ srcSize - ZSTD_minGain(srcSize, zc->appliedParams.cParams.strategy);
FORWARD_IF_ERROR(cSize, "ZSTD_compressSuperBlock failed");
if (cSize != 0 && cSize < maxCSize + ZSTD_blockHeaderSize) {
ZSTD_blockState_confirmRepcodesAndEntropyTables(&zc->blockState);
}
}
}
- }
+ } /* if (bss == ZSTDbss_compress)*/
DEBUGLOG(6, "Resorting to ZSTD_noCompressBlock()");
/* Superblock compression failed, attempt to emit a single no compress block.
* All blocks will be terminated, all input will be consumed.
* Function will issue an error if there is not enough `dstCapacity` to hold the compressed content.
* Frame is supposed already started (header already produced)
-* @return : compressed size, or an error code
+* @return : compressed size, or an error code
*/
static size_t ZSTD_compress_frameChunk(ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity,
MEM_writeLE24(op, cBlockHeader);
cSize += ZSTD_blockHeaderSize;
}
- }
+ } /* if (ZSTD_useTargetCBlockSize(&cctx->appliedParams))*/
ip += blockSize;
projects / thirdparty / zstd.git / commitdiff
