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0001 /*
0002  * Copyright (c) Yann Collet, Facebook, Inc.
0003  * All rights reserved.
0004  *
0005  * This source code is licensed under both the BSD-style license (found in the
0006  * LICENSE file in the root directory of this source tree) and the GPLv2 (found
0007  * in the COPYING file in the root directory of this source tree).
0008  * You may select, at your option, one of the above-listed licenses.
0009  */
0010 
0011  /*-*************************************
0012  *  Dependencies
0013  ***************************************/
0014 #include "zstd_compress_superblock.h"
0015 
0016 #include "../common/zstd_internal.h"  /* ZSTD_getSequenceLength */
0017 #include "hist.h"                     /* HIST_countFast_wksp */
0018 #include "zstd_compress_internal.h"
0019 #include "zstd_compress_sequences.h"
0020 #include "zstd_compress_literals.h"
0021 
0022 /*-*************************************
0023 *  Superblock entropy buffer structs
0024 ***************************************/
0025 /* ZSTD_hufCTablesMetadata_t :
0026  *  Stores Literals Block Type for a super-block in hType, and
0027  *  huffman tree description in hufDesBuffer.
0028  *  hufDesSize refers to the size of huffman tree description in bytes.
0029  *  This metadata is populated in ZSTD_buildSuperBlockEntropy_literal() */
0030 typedef struct {
0031     symbolEncodingType_e hType;
0032     BYTE hufDesBuffer[ZSTD_MAX_HUF_HEADER_SIZE];
0033     size_t hufDesSize;
0034 } ZSTD_hufCTablesMetadata_t;
0035 
0036 /* ZSTD_fseCTablesMetadata_t :
0037  *  Stores symbol compression modes for a super-block in {ll, ol, ml}Type, and
0038  *  fse tables in fseTablesBuffer.
0039  *  fseTablesSize refers to the size of fse tables in bytes.
0040  *  This metadata is populated in ZSTD_buildSuperBlockEntropy_sequences() */
0041 typedef struct {
0042     symbolEncodingType_e llType;
0043     symbolEncodingType_e ofType;
0044     symbolEncodingType_e mlType;
0045     BYTE fseTablesBuffer[ZSTD_MAX_FSE_HEADERS_SIZE];
0046     size_t fseTablesSize;
0047     size_t lastCountSize; /* This is to account for bug in 1.3.4. More detail in ZSTD_compressSubBlock_sequences() */
0048 } ZSTD_fseCTablesMetadata_t;
0049 
0050 typedef struct {
0051     ZSTD_hufCTablesMetadata_t hufMetadata;
0052     ZSTD_fseCTablesMetadata_t fseMetadata;
0053 } ZSTD_entropyCTablesMetadata_t;
0054 
0055 
0056 /* ZSTD_buildSuperBlockEntropy_literal() :
0057  *  Builds entropy for the super-block literals.
0058  *  Stores literals block type (raw, rle, compressed, repeat) and
0059  *  huffman description table to hufMetadata.
0060  *  @return : size of huffman description table or error code */
0061 static size_t ZSTD_buildSuperBlockEntropy_literal(void* const src, size_t srcSize,
0062                                             const ZSTD_hufCTables_t* prevHuf,
0063                                                   ZSTD_hufCTables_t* nextHuf,
0064                                                   ZSTD_hufCTablesMetadata_t* hufMetadata,
0065                                                   const int disableLiteralsCompression,
0066                                                   void* workspace, size_t wkspSize)
0067 {
0068     BYTE* const wkspStart = (BYTE*)workspace;
0069     BYTE* const wkspEnd = wkspStart + wkspSize;
0070     BYTE* const countWkspStart = wkspStart;
0071     unsigned* const countWksp = (unsigned*)workspace;
0072     const size_t countWkspSize = (HUF_SYMBOLVALUE_MAX + 1) * sizeof(unsigned);
0073     BYTE* const nodeWksp = countWkspStart + countWkspSize;
0074     const size_t nodeWkspSize = wkspEnd-nodeWksp;
0075     unsigned maxSymbolValue = 255;
0076     unsigned huffLog = HUF_TABLELOG_DEFAULT;
0077     HUF_repeat repeat = prevHuf->repeatMode;
0078 
0079     DEBUGLOG(5, "ZSTD_buildSuperBlockEntropy_literal (srcSize=%zu)", srcSize);
0080 
0081     /* Prepare nextEntropy assuming reusing the existing table */
0082     ZSTD_memcpy(nextHuf, prevHuf, sizeof(*prevHuf));
0083 
0084     if (disableLiteralsCompression) {
0085         DEBUGLOG(5, "set_basic - disabled");
0086         hufMetadata->hType = set_basic;
0087         return 0;
0088     }
0089 
0090     /* small ? don't even attempt compression (speed opt) */
0091 #   define COMPRESS_LITERALS_SIZE_MIN 63
0092     {   size_t const minLitSize = (prevHuf->repeatMode == HUF_repeat_valid) ? 6 : COMPRESS_LITERALS_SIZE_MIN;
0093         if (srcSize <= minLitSize) {
0094             DEBUGLOG(5, "set_basic - too small");
0095             hufMetadata->hType = set_basic;
0096             return 0;
0097         }
0098     }
0099 
0100     /* Scan input and build symbol stats */
0101     {   size_t const largest = HIST_count_wksp (countWksp, &maxSymbolValue, (const BYTE*)src, srcSize, workspace, wkspSize);
0102         FORWARD_IF_ERROR(largest, "HIST_count_wksp failed");
0103         if (largest == srcSize) {
0104             DEBUGLOG(5, "set_rle");
0105             hufMetadata->hType = set_rle;
0106             return 0;
0107         }
0108         if (largest <= (srcSize >> 7)+4) {
0109             DEBUGLOG(5, "set_basic - no gain");
0110             hufMetadata->hType = set_basic;
0111             return 0;
0112         }
0113     }
0114 
0115     /* Validate the previous Huffman table */
0116     if (repeat == HUF_repeat_check && !HUF_validateCTable((HUF_CElt const*)prevHuf->CTable, countWksp, maxSymbolValue)) {
0117         repeat = HUF_repeat_none;
0118     }
0119 
0120     /* Build Huffman Tree */
0121     ZSTD_memset(nextHuf->CTable, 0, sizeof(nextHuf->CTable));
0122     huffLog = HUF_optimalTableLog(huffLog, srcSize, maxSymbolValue);
0123     {   size_t const maxBits = HUF_buildCTable_wksp((HUF_CElt*)nextHuf->CTable, countWksp,
0124                                                     maxSymbolValue, huffLog,
0125                                                     nodeWksp, nodeWkspSize);
0126         FORWARD_IF_ERROR(maxBits, "HUF_buildCTable_wksp");
0127         huffLog = (U32)maxBits;
0128         {   /* Build and write the CTable */
0129             size_t const newCSize = HUF_estimateCompressedSize(
0130                     (HUF_CElt*)nextHuf->CTable, countWksp, maxSymbolValue);
0131             size_t const hSize = HUF_writeCTable_wksp(
0132                     hufMetadata->hufDesBuffer, sizeof(hufMetadata->hufDesBuffer),
0133                     (HUF_CElt*)nextHuf->CTable, maxSymbolValue, huffLog,
0134                     nodeWksp, nodeWkspSize);
0135             /* Check against repeating the previous CTable */
0136             if (repeat != HUF_repeat_none) {
0137                 size_t const oldCSize = HUF_estimateCompressedSize(
0138                         (HUF_CElt const*)prevHuf->CTable, countWksp, maxSymbolValue);
0139                 if (oldCSize < srcSize && (oldCSize <= hSize + newCSize || hSize + 12 >= srcSize)) {
0140                     DEBUGLOG(5, "set_repeat - smaller");
0141                     ZSTD_memcpy(nextHuf, prevHuf, sizeof(*prevHuf));
0142                     hufMetadata->hType = set_repeat;
0143                     return 0;
0144                 }
0145             }
0146             if (newCSize + hSize >= srcSize) {
0147                 DEBUGLOG(5, "set_basic - no gains");
0148                 ZSTD_memcpy(nextHuf, prevHuf, sizeof(*prevHuf));
0149                 hufMetadata->hType = set_basic;
0150                 return 0;
0151             }
0152             DEBUGLOG(5, "set_compressed (hSize=%u)", (U32)hSize);
0153             hufMetadata->hType = set_compressed;
0154             nextHuf->repeatMode = HUF_repeat_check;
0155             return hSize;
0156         }
0157     }
0158 }
0159 
0160 /* ZSTD_buildSuperBlockEntropy_sequences() :
0161  *  Builds entropy for the super-block sequences.
0162  *  Stores symbol compression modes and fse table to fseMetadata.
0163  *  @return : size of fse tables or error code */
0164 static size_t ZSTD_buildSuperBlockEntropy_sequences(seqStore_t* seqStorePtr,
0165                                               const ZSTD_fseCTables_t* prevEntropy,
0166                                                     ZSTD_fseCTables_t* nextEntropy,
0167                                               const ZSTD_CCtx_params* cctxParams,
0168                                                     ZSTD_fseCTablesMetadata_t* fseMetadata,
0169                                                     void* workspace, size_t wkspSize)
0170 {
0171     BYTE* const wkspStart = (BYTE*)workspace;
0172     BYTE* const wkspEnd = wkspStart + wkspSize;
0173     BYTE* const countWkspStart = wkspStart;
0174     unsigned* const countWksp = (unsigned*)workspace;
0175     const size_t countWkspSize = (MaxSeq + 1) * sizeof(unsigned);
0176     BYTE* const cTableWksp = countWkspStart + countWkspSize;
0177     const size_t cTableWkspSize = wkspEnd-cTableWksp;
0178     ZSTD_strategy const strategy = cctxParams->cParams.strategy;
0179     FSE_CTable* CTable_LitLength = nextEntropy->litlengthCTable;
0180     FSE_CTable* CTable_OffsetBits = nextEntropy->offcodeCTable;
0181     FSE_CTable* CTable_MatchLength = nextEntropy->matchlengthCTable;
0182     const BYTE* const ofCodeTable = seqStorePtr->ofCode;
0183     const BYTE* const llCodeTable = seqStorePtr->llCode;
0184     const BYTE* const mlCodeTable = seqStorePtr->mlCode;
0185     size_t const nbSeq = seqStorePtr->sequences - seqStorePtr->sequencesStart;
0186     BYTE* const ostart = fseMetadata->fseTablesBuffer;
0187     BYTE* const oend = ostart + sizeof(fseMetadata->fseTablesBuffer);
0188     BYTE* op = ostart;
0189 
0190     assert(cTableWkspSize >= (1 << MaxFSELog) * sizeof(FSE_FUNCTION_TYPE));
0191     DEBUGLOG(5, "ZSTD_buildSuperBlockEntropy_sequences (nbSeq=%zu)", nbSeq);
0192     ZSTD_memset(workspace, 0, wkspSize);
0193 
0194     fseMetadata->lastCountSize = 0;
0195     /* convert length/distances into codes */
0196     ZSTD_seqToCodes(seqStorePtr);
0197     /* build CTable for Literal Lengths */
0198     {   U32 LLtype;
0199         unsigned max = MaxLL;
0200         size_t const mostFrequent = HIST_countFast_wksp(countWksp, &max, llCodeTable, nbSeq, workspace, wkspSize);  /* can't fail */
0201         DEBUGLOG(5, "Building LL table");
0202         nextEntropy->litlength_repeatMode = prevEntropy->litlength_repeatMode;
0203         LLtype = ZSTD_selectEncodingType(&nextEntropy->litlength_repeatMode,
0204                                         countWksp, max, mostFrequent, nbSeq,
0205                                         LLFSELog, prevEntropy->litlengthCTable,
0206                                         LL_defaultNorm, LL_defaultNormLog,
0207                                         ZSTD_defaultAllowed, strategy);
0208         assert(set_basic < set_compressed && set_rle < set_compressed);
0209         assert(!(LLtype < set_compressed && nextEntropy->litlength_repeatMode != FSE_repeat_none)); /* We don't copy tables */
0210         {   size_t const countSize = ZSTD_buildCTable(op, oend - op, CTable_LitLength, LLFSELog, (symbolEncodingType_e)LLtype,
0211                                                     countWksp, max, llCodeTable, nbSeq, LL_defaultNorm, LL_defaultNormLog, MaxLL,
0212                                                     prevEntropy->litlengthCTable, sizeof(prevEntropy->litlengthCTable),
0213                                                     cTableWksp, cTableWkspSize);
0214             FORWARD_IF_ERROR(countSize, "ZSTD_buildCTable for LitLens failed");
0215             if (LLtype == set_compressed)
0216                 fseMetadata->lastCountSize = countSize;
0217             op += countSize;
0218             fseMetadata->llType = (symbolEncodingType_e) LLtype;
0219     }   }
0220     /* build CTable for Offsets */
0221     {   U32 Offtype;
0222         unsigned max = MaxOff;
0223         size_t const mostFrequent = HIST_countFast_wksp(countWksp, &max, ofCodeTable, nbSeq, workspace, wkspSize);  /* can't fail */
0224         /* We can only use the basic table if max <= DefaultMaxOff, otherwise the offsets are too large */
0225         ZSTD_defaultPolicy_e const defaultPolicy = (max <= DefaultMaxOff) ? ZSTD_defaultAllowed : ZSTD_defaultDisallowed;
0226         DEBUGLOG(5, "Building OF table");
0227         nextEntropy->offcode_repeatMode = prevEntropy->offcode_repeatMode;
0228         Offtype = ZSTD_selectEncodingType(&nextEntropy->offcode_repeatMode,
0229                                         countWksp, max, mostFrequent, nbSeq,
0230                                         OffFSELog, prevEntropy->offcodeCTable,
0231                                         OF_defaultNorm, OF_defaultNormLog,
0232                                         defaultPolicy, strategy);
0233         assert(!(Offtype < set_compressed && nextEntropy->offcode_repeatMode != FSE_repeat_none)); /* We don't copy tables */
0234         {   size_t const countSize = ZSTD_buildCTable(op, oend - op, CTable_OffsetBits, OffFSELog, (symbolEncodingType_e)Offtype,
0235                                                     countWksp, max, ofCodeTable, nbSeq, OF_defaultNorm, OF_defaultNormLog, DefaultMaxOff,
0236                                                     prevEntropy->offcodeCTable, sizeof(prevEntropy->offcodeCTable),
0237                                                     cTableWksp, cTableWkspSize);
0238             FORWARD_IF_ERROR(countSize, "ZSTD_buildCTable for Offsets failed");
0239             if (Offtype == set_compressed)
0240                 fseMetadata->lastCountSize = countSize;
0241             op += countSize;
0242             fseMetadata->ofType = (symbolEncodingType_e) Offtype;
0243     }   }
0244     /* build CTable for MatchLengths */
0245     {   U32 MLtype;
0246         unsigned max = MaxML;
0247         size_t const mostFrequent = HIST_countFast_wksp(countWksp, &max, mlCodeTable, nbSeq, workspace, wkspSize);   /* can't fail */
0248         DEBUGLOG(5, "Building ML table (remaining space : %i)", (int)(oend-op));
0249         nextEntropy->matchlength_repeatMode = prevEntropy->matchlength_repeatMode;
0250         MLtype = ZSTD_selectEncodingType(&nextEntropy->matchlength_repeatMode,
0251                                         countWksp, max, mostFrequent, nbSeq,
0252                                         MLFSELog, prevEntropy->matchlengthCTable,
0253                                         ML_defaultNorm, ML_defaultNormLog,
0254                                         ZSTD_defaultAllowed, strategy);
0255         assert(!(MLtype < set_compressed && nextEntropy->matchlength_repeatMode != FSE_repeat_none)); /* We don't copy tables */
0256         {   size_t const countSize = ZSTD_buildCTable(op, oend - op, CTable_MatchLength, MLFSELog, (symbolEncodingType_e)MLtype,
0257                                                     countWksp, max, mlCodeTable, nbSeq, ML_defaultNorm, ML_defaultNormLog, MaxML,
0258                                                     prevEntropy->matchlengthCTable, sizeof(prevEntropy->matchlengthCTable),
0259                                                     cTableWksp, cTableWkspSize);
0260             FORWARD_IF_ERROR(countSize, "ZSTD_buildCTable for MatchLengths failed");
0261             if (MLtype == set_compressed)
0262                 fseMetadata->lastCountSize = countSize;
0263             op += countSize;
0264             fseMetadata->mlType = (symbolEncodingType_e) MLtype;
0265     }   }
0266     assert((size_t) (op-ostart) <= sizeof(fseMetadata->fseTablesBuffer));
0267     return op-ostart;
0268 }
0269 
0270 
0271 /* ZSTD_buildSuperBlockEntropy() :
0272  *  Builds entropy for the super-block.
0273  *  @return : 0 on success or error code */
0274 static size_t
0275 ZSTD_buildSuperBlockEntropy(seqStore_t* seqStorePtr,
0276                       const ZSTD_entropyCTables_t* prevEntropy,
0277                             ZSTD_entropyCTables_t* nextEntropy,
0278                       const ZSTD_CCtx_params* cctxParams,
0279                             ZSTD_entropyCTablesMetadata_t* entropyMetadata,
0280                             void* workspace, size_t wkspSize)
0281 {
0282     size_t const litSize = seqStorePtr->lit - seqStorePtr->litStart;
0283     DEBUGLOG(5, "ZSTD_buildSuperBlockEntropy");
0284     entropyMetadata->hufMetadata.hufDesSize =
0285         ZSTD_buildSuperBlockEntropy_literal(seqStorePtr->litStart, litSize,
0286                                             &prevEntropy->huf, &nextEntropy->huf,
0287                                             &entropyMetadata->hufMetadata,
0288                                             ZSTD_disableLiteralsCompression(cctxParams),
0289                                             workspace, wkspSize);
0290     FORWARD_IF_ERROR(entropyMetadata->hufMetadata.hufDesSize, "ZSTD_buildSuperBlockEntropy_literal failed");
0291     entropyMetadata->fseMetadata.fseTablesSize =
0292         ZSTD_buildSuperBlockEntropy_sequences(seqStorePtr,
0293                                               &prevEntropy->fse, &nextEntropy->fse,
0294                                               cctxParams,
0295                                               &entropyMetadata->fseMetadata,
0296                                               workspace, wkspSize);
0297     FORWARD_IF_ERROR(entropyMetadata->fseMetadata.fseTablesSize, "ZSTD_buildSuperBlockEntropy_sequences failed");
0298     return 0;
0299 }
0300 
0301 /* ZSTD_compressSubBlock_literal() :
0302  *  Compresses literals section for a sub-block.
0303  *  When we have to write the Huffman table we will sometimes choose a header
0304  *  size larger than necessary. This is because we have to pick the header size
0305  *  before we know the table size + compressed size, so we have a bound on the
0306  *  table size. If we guessed incorrectly, we fall back to uncompressed literals.
0307  *
0308  *  We write the header when writeEntropy=1 and set entropyWritten=1 when we succeeded
0309  *  in writing the header, otherwise it is set to 0.
0310  *
0311  *  hufMetadata->hType has literals block type info.
0312  *      If it is set_basic, all sub-blocks literals section will be Raw_Literals_Block.
0313  *      If it is set_rle, all sub-blocks literals section will be RLE_Literals_Block.
0314  *      If it is set_compressed, first sub-block's literals section will be Compressed_Literals_Block
0315  *      If it is set_compressed, first sub-block's literals section will be Treeless_Literals_Block
0316  *      and the following sub-blocks' literals sections will be Treeless_Literals_Block.
0317  *  @return : compressed size of literals section of a sub-block
0318  *            Or 0 if it unable to compress.
0319  *            Or error code */
0320 static size_t ZSTD_compressSubBlock_literal(const HUF_CElt* hufTable,
0321                                     const ZSTD_hufCTablesMetadata_t* hufMetadata,
0322                                     const BYTE* literals, size_t litSize,
0323                                     void* dst, size_t dstSize,
0324                                     const int bmi2, int writeEntropy, int* entropyWritten)
0325 {
0326     size_t const header = writeEntropy ? 200 : 0;
0327     size_t const lhSize = 3 + (litSize >= (1 KB - header)) + (litSize >= (16 KB - header));
0328     BYTE* const ostart = (BYTE*)dst;
0329     BYTE* const oend = ostart + dstSize;
0330     BYTE* op = ostart + lhSize;
0331     U32 const singleStream = lhSize == 3;
0332     symbolEncodingType_e hType = writeEntropy ? hufMetadata->hType : set_repeat;
0333     size_t cLitSize = 0;
0334 
0335     (void)bmi2; /* TODO bmi2... */
0336 
0337     DEBUGLOG(5, "ZSTD_compressSubBlock_literal (litSize=%zu, lhSize=%zu, writeEntropy=%d)", litSize, lhSize, writeEntropy);
0338 
0339     *entropyWritten = 0;
0340     if (litSize == 0 || hufMetadata->hType == set_basic) {
0341       DEBUGLOG(5, "ZSTD_compressSubBlock_literal using raw literal");
0342       return ZSTD_noCompressLiterals(dst, dstSize, literals, litSize);
0343     } else if (hufMetadata->hType == set_rle) {
0344       DEBUGLOG(5, "ZSTD_compressSubBlock_literal using rle literal");
0345       return ZSTD_compressRleLiteralsBlock(dst, dstSize, literals, litSize);
0346     }
0347 
0348     assert(litSize > 0);
0349     assert(hufMetadata->hType == set_compressed || hufMetadata->hType == set_repeat);
0350 
0351     if (writeEntropy && hufMetadata->hType == set_compressed) {
0352         ZSTD_memcpy(op, hufMetadata->hufDesBuffer, hufMetadata->hufDesSize);
0353         op += hufMetadata->hufDesSize;
0354         cLitSize += hufMetadata->hufDesSize;
0355         DEBUGLOG(5, "ZSTD_compressSubBlock_literal (hSize=%zu)", hufMetadata->hufDesSize);
0356     }
0357 
0358     /* TODO bmi2 */
0359     {   const size_t cSize = singleStream ? HUF_compress1X_usingCTable(op, oend-op, literals, litSize, hufTable)
0360                                           : HUF_compress4X_usingCTable(op, oend-op, literals, litSize, hufTable);
0361         op += cSize;
0362         cLitSize += cSize;
0363         if (cSize == 0 || ERR_isError(cSize)) {
0364             DEBUGLOG(5, "Failed to write entropy tables %s", ZSTD_getErrorName(cSize));
0365             return 0;
0366         }
0367         /* If we expand and we aren't writing a header then emit uncompressed */
0368         if (!writeEntropy && cLitSize >= litSize) {
0369             DEBUGLOG(5, "ZSTD_compressSubBlock_literal using raw literal because uncompressible");
0370             return ZSTD_noCompressLiterals(dst, dstSize, literals, litSize);
0371         }
0372         /* If we are writing headers then allow expansion that doesn't change our header size. */
0373         if (lhSize < (size_t)(3 + (cLitSize >= 1 KB) + (cLitSize >= 16 KB))) {
0374             assert(cLitSize > litSize);
0375             DEBUGLOG(5, "Literals expanded beyond allowed header size");
0376             return ZSTD_noCompressLiterals(dst, dstSize, literals, litSize);
0377         }
0378         DEBUGLOG(5, "ZSTD_compressSubBlock_literal (cSize=%zu)", cSize);
0379     }
0380 
0381     /* Build header */
0382     switch(lhSize)
0383     {
0384     case 3: /* 2 - 2 - 10 - 10 */
0385         {   U32 const lhc = hType + ((!singleStream) << 2) + ((U32)litSize<<4) + ((U32)cLitSize<<14);
0386             MEM_writeLE24(ostart, lhc);
0387             break;
0388         }
0389     case 4: /* 2 - 2 - 14 - 14 */
0390         {   U32 const lhc = hType + (2 << 2) + ((U32)litSize<<4) + ((U32)cLitSize<<18);
0391             MEM_writeLE32(ostart, lhc);
0392             break;
0393         }
0394     case 5: /* 2 - 2 - 18 - 18 */
0395         {   U32 const lhc = hType + (3 << 2) + ((U32)litSize<<4) + ((U32)cLitSize<<22);
0396             MEM_writeLE32(ostart, lhc);
0397             ostart[4] = (BYTE)(cLitSize >> 10);
0398             break;
0399         }
0400     default:  /* not possible : lhSize is {3,4,5} */
0401         assert(0);
0402     }
0403     *entropyWritten = 1;
0404     DEBUGLOG(5, "Compressed literals: %u -> %u", (U32)litSize, (U32)(op-ostart));
0405     return op-ostart;
0406 }
0407 
0408 static size_t ZSTD_seqDecompressedSize(seqStore_t const* seqStore, const seqDef* sequences, size_t nbSeq, size_t litSize, int lastSequence) {
0409     const seqDef* const sstart = sequences;
0410     const seqDef* const send = sequences + nbSeq;
0411     const seqDef* sp = sstart;
0412     size_t matchLengthSum = 0;
0413     size_t litLengthSum = 0;
0414     /* Only used by assert(), suppress unused variable warnings in production. */
0415     (void)litLengthSum;
0416     while (send-sp > 0) {
0417         ZSTD_sequenceLength const seqLen = ZSTD_getSequenceLength(seqStore, sp);
0418         litLengthSum += seqLen.litLength;
0419         matchLengthSum += seqLen.matchLength;
0420         sp++;
0421     }
0422     assert(litLengthSum <= litSize);
0423     if (!lastSequence) {
0424         assert(litLengthSum == litSize);
0425     }
0426     return matchLengthSum + litSize;
0427 }
0428 
0429 /* ZSTD_compressSubBlock_sequences() :
0430  *  Compresses sequences section for a sub-block.
0431  *  fseMetadata->llType, fseMetadata->ofType, and fseMetadata->mlType have
0432  *  symbol compression modes for the super-block.
0433  *  The first successfully compressed block will have these in its header.
0434  *  We set entropyWritten=1 when we succeed in compressing the sequences.
0435  *  The following sub-blocks will always have repeat mode.
0436  *  @return : compressed size of sequences section of a sub-block
0437  *            Or 0 if it is unable to compress
0438  *            Or error code. */
0439 static size_t ZSTD_compressSubBlock_sequences(const ZSTD_fseCTables_t* fseTables,
0440                                               const ZSTD_fseCTablesMetadata_t* fseMetadata,
0441                                               const seqDef* sequences, size_t nbSeq,
0442                                               const BYTE* llCode, const BYTE* mlCode, const BYTE* ofCode,
0443                                               const ZSTD_CCtx_params* cctxParams,
0444                                               void* dst, size_t dstCapacity,
0445                                               const int bmi2, int writeEntropy, int* entropyWritten)
0446 {
0447     const int longOffsets = cctxParams->cParams.windowLog > STREAM_ACCUMULATOR_MIN;
0448     BYTE* const ostart = (BYTE*)dst;
0449     BYTE* const oend = ostart + dstCapacity;
0450     BYTE* op = ostart;
0451     BYTE* seqHead;
0452 
0453     DEBUGLOG(5, "ZSTD_compressSubBlock_sequences (nbSeq=%zu, writeEntropy=%d, longOffsets=%d)", nbSeq, writeEntropy, longOffsets);
0454 
0455     *entropyWritten = 0;
0456     /* Sequences Header */
0457     RETURN_ERROR_IF((oend-op) < 3 /*max nbSeq Size*/ + 1 /*seqHead*/,
0458                     dstSize_tooSmall, "");
0459     if (nbSeq < 0x7F)
0460         *op++ = (BYTE)nbSeq;
0461     else if (nbSeq < LONGNBSEQ)
0462         op[0] = (BYTE)((nbSeq>>8) + 0x80), op[1] = (BYTE)nbSeq, op+=2;
0463     else
0464         op[0]=0xFF, MEM_writeLE16(op+1, (U16)(nbSeq - LONGNBSEQ)), op+=3;
0465     if (nbSeq==0) {
0466         return op - ostart;
0467     }
0468 
0469     /* seqHead : flags for FSE encoding type */
0470     seqHead = op++;
0471 
0472     DEBUGLOG(5, "ZSTD_compressSubBlock_sequences (seqHeadSize=%u)", (unsigned)(op-ostart));
0473 
0474     if (writeEntropy) {
0475         const U32 LLtype = fseMetadata->llType;
0476         const U32 Offtype = fseMetadata->ofType;
0477         const U32 MLtype = fseMetadata->mlType;
0478         DEBUGLOG(5, "ZSTD_compressSubBlock_sequences (fseTablesSize=%zu)", fseMetadata->fseTablesSize);
0479         *seqHead = (BYTE)((LLtype<<6) + (Offtype<<4) + (MLtype<<2));
0480         ZSTD_memcpy(op, fseMetadata->fseTablesBuffer, fseMetadata->fseTablesSize);
0481         op += fseMetadata->fseTablesSize;
0482     } else {
0483         const U32 repeat = set_repeat;
0484         *seqHead = (BYTE)((repeat<<6) + (repeat<<4) + (repeat<<2));
0485     }
0486 
0487     {   size_t const bitstreamSize = ZSTD_encodeSequences(
0488                                         op, oend - op,
0489                                         fseTables->matchlengthCTable, mlCode,
0490                                         fseTables->offcodeCTable, ofCode,
0491                                         fseTables->litlengthCTable, llCode,
0492                                         sequences, nbSeq,
0493                                         longOffsets, bmi2);
0494         FORWARD_IF_ERROR(bitstreamSize, "ZSTD_encodeSequences failed");
0495         op += bitstreamSize;
0496         /* zstd versions <= 1.3.4 mistakenly report corruption when
0497          * FSE_readNCount() receives a buffer < 4 bytes.
0498          * Fixed by https://github.com/facebook/zstd/pull/1146.
0499          * This can happen when the last set_compressed table present is 2
0500          * bytes and the bitstream is only one byte.
0501          * In this exceedingly rare case, we will simply emit an uncompressed
0502          * block, since it isn't worth optimizing.
0503          */
0504 #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
0505         if (writeEntropy && fseMetadata->lastCountSize && fseMetadata->lastCountSize + bitstreamSize < 4) {
0506             /* NCountSize >= 2 && bitstreamSize > 0 ==> lastCountSize == 3 */
0507             assert(fseMetadata->lastCountSize + bitstreamSize == 3);
0508             DEBUGLOG(5, "Avoiding bug in zstd decoder in versions <= 1.3.4 by "
0509                         "emitting an uncompressed block.");
0510             return 0;
0511         }
0512 #endif
0513         DEBUGLOG(5, "ZSTD_compressSubBlock_sequences (bitstreamSize=%zu)", bitstreamSize);
0514     }
0515 
0516     /* zstd versions <= 1.4.0 mistakenly report error when
0517      * sequences section body size is less than 3 bytes.
0518      * Fixed by https://github.com/facebook/zstd/pull/1664.
0519      * This can happen when the previous sequences section block is compressed
0520      * with rle mode and the current block's sequences section is compressed
0521      * with repeat mode where sequences section body size can be 1 byte.
0522      */
0523 #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
0524     if (op-seqHead < 4) {
0525         DEBUGLOG(5, "Avoiding bug in zstd decoder in versions <= 1.4.0 by emitting "
0526                     "an uncompressed block when sequences are < 4 bytes");
0527         return 0;
0528     }
0529 #endif
0530 
0531     *entropyWritten = 1;
0532     return op - ostart;
0533 }
0534 
0535 /* ZSTD_compressSubBlock() :
0536  *  Compresses a single sub-block.
0537  *  @return : compressed size of the sub-block
0538  *            Or 0 if it failed to compress. */
0539 static size_t ZSTD_compressSubBlock(const ZSTD_entropyCTables_t* entropy,
0540                                     const ZSTD_entropyCTablesMetadata_t* entropyMetadata,
0541                                     const seqDef* sequences, size_t nbSeq,
0542                                     const BYTE* literals, size_t litSize,
0543                                     const BYTE* llCode, const BYTE* mlCode, const BYTE* ofCode,
0544                                     const ZSTD_CCtx_params* cctxParams,
0545                                     void* dst, size_t dstCapacity,
0546                                     const int bmi2,
0547                                     int writeLitEntropy, int writeSeqEntropy,
0548                                     int* litEntropyWritten, int* seqEntropyWritten,
0549                                     U32 lastBlock)
0550 {
0551     BYTE* const ostart = (BYTE*)dst;
0552     BYTE* const oend = ostart + dstCapacity;
0553     BYTE* op = ostart + ZSTD_blockHeaderSize;
0554     DEBUGLOG(5, "ZSTD_compressSubBlock (litSize=%zu, nbSeq=%zu, writeLitEntropy=%d, writeSeqEntropy=%d, lastBlock=%d)",
0555                 litSize, nbSeq, writeLitEntropy, writeSeqEntropy, lastBlock);
0556     {   size_t cLitSize = ZSTD_compressSubBlock_literal((const HUF_CElt*)entropy->huf.CTable,
0557                                                         &entropyMetadata->hufMetadata, literals, litSize,
0558                                                         op, oend-op, bmi2, writeLitEntropy, litEntropyWritten);
0559         FORWARD_IF_ERROR(cLitSize, "ZSTD_compressSubBlock_literal failed");
0560         if (cLitSize == 0) return 0;
0561         op += cLitSize;
0562     }
0563     {   size_t cSeqSize = ZSTD_compressSubBlock_sequences(&entropy->fse,
0564                                                   &entropyMetadata->fseMetadata,
0565                                                   sequences, nbSeq,
0566                                                   llCode, mlCode, ofCode,
0567                                                   cctxParams,
0568                                                   op, oend-op,
0569                                                   bmi2, writeSeqEntropy, seqEntropyWritten);
0570         FORWARD_IF_ERROR(cSeqSize, "ZSTD_compressSubBlock_sequences failed");
0571         if (cSeqSize == 0) return 0;
0572         op += cSeqSize;
0573     }
0574     /* Write block header */
0575     {   size_t cSize = (op-ostart)-ZSTD_blockHeaderSize;
0576         U32 const cBlockHeader24 = lastBlock + (((U32)bt_compressed)<<1) + (U32)(cSize << 3);
0577         MEM_writeLE24(ostart, cBlockHeader24);
0578     }
0579     return op-ostart;
0580 }
0581 
0582 static size_t ZSTD_estimateSubBlockSize_literal(const BYTE* literals, size_t litSize,
0583                                                 const ZSTD_hufCTables_t* huf,
0584                                                 const ZSTD_hufCTablesMetadata_t* hufMetadata,
0585                                                 void* workspace, size_t wkspSize,
0586                                                 int writeEntropy)
0587 {
0588     unsigned* const countWksp = (unsigned*)workspace;
0589     unsigned maxSymbolValue = 255;
0590     size_t literalSectionHeaderSize = 3; /* Use hard coded size of 3 bytes */
0591 
0592     if (hufMetadata->hType == set_basic) return litSize;
0593     else if (hufMetadata->hType == set_rle) return 1;
0594     else if (hufMetadata->hType == set_compressed || hufMetadata->hType == set_repeat) {
0595         size_t const largest = HIST_count_wksp (countWksp, &maxSymbolValue, (const BYTE*)literals, litSize, workspace, wkspSize);
0596         if (ZSTD_isError(largest)) return litSize;
0597         {   size_t cLitSizeEstimate = HUF_estimateCompressedSize((const HUF_CElt*)huf->CTable, countWksp, maxSymbolValue);
0598             if (writeEntropy) cLitSizeEstimate += hufMetadata->hufDesSize;
0599             return cLitSizeEstimate + literalSectionHeaderSize;
0600     }   }
0601     assert(0); /* impossible */
0602     return 0;
0603 }
0604 
0605 static size_t ZSTD_estimateSubBlockSize_symbolType(symbolEncodingType_e type,
0606                         const BYTE* codeTable, unsigned maxCode,
0607                         size_t nbSeq, const FSE_CTable* fseCTable,
0608                         const U32* additionalBits,
0609                         short const* defaultNorm, U32 defaultNormLog, U32 defaultMax,
0610                         void* workspace, size_t wkspSize)
0611 {
0612     unsigned* const countWksp = (unsigned*)workspace;
0613     const BYTE* ctp = codeTable;
0614     const BYTE* const ctStart = ctp;
0615     const BYTE* const ctEnd = ctStart + nbSeq;
0616     size_t cSymbolTypeSizeEstimateInBits = 0;
0617     unsigned max = maxCode;
0618 
0619     HIST_countFast_wksp(countWksp, &max, codeTable, nbSeq, workspace, wkspSize);  /* can't fail */
0620     if (type == set_basic) {
0621         /* We selected this encoding type, so it must be valid. */
0622         assert(max <= defaultMax);
0623         cSymbolTypeSizeEstimateInBits = max <= defaultMax
0624                 ? ZSTD_crossEntropyCost(defaultNorm, defaultNormLog, countWksp, max)
0625                 : ERROR(GENERIC);
0626     } else if (type == set_rle) {
0627         cSymbolTypeSizeEstimateInBits = 0;
0628     } else if (type == set_compressed || type == set_repeat) {
0629         cSymbolTypeSizeEstimateInBits = ZSTD_fseBitCost(fseCTable, countWksp, max);
0630     }
0631     if (ZSTD_isError(cSymbolTypeSizeEstimateInBits)) return nbSeq * 10;
0632     while (ctp < ctEnd) {
0633         if (additionalBits) cSymbolTypeSizeEstimateInBits += additionalBits[*ctp];
0634         else cSymbolTypeSizeEstimateInBits += *ctp; /* for offset, offset code is also the number of additional bits */
0635         ctp++;
0636     }
0637     return cSymbolTypeSizeEstimateInBits / 8;
0638 }
0639 
0640 static size_t ZSTD_estimateSubBlockSize_sequences(const BYTE* ofCodeTable,
0641                                                   const BYTE* llCodeTable,
0642                                                   const BYTE* mlCodeTable,
0643                                                   size_t nbSeq,
0644                                                   const ZSTD_fseCTables_t* fseTables,
0645                                                   const ZSTD_fseCTablesMetadata_t* fseMetadata,
0646                                                   void* workspace, size_t wkspSize,
0647                                                   int writeEntropy)
0648 {
0649     size_t sequencesSectionHeaderSize = 3; /* Use hard coded size of 3 bytes */
0650     size_t cSeqSizeEstimate = 0;
0651     cSeqSizeEstimate += ZSTD_estimateSubBlockSize_symbolType(fseMetadata->ofType, ofCodeTable, MaxOff,
0652                                          nbSeq, fseTables->offcodeCTable, NULL,
0653                                          OF_defaultNorm, OF_defaultNormLog, DefaultMaxOff,
0654                                          workspace, wkspSize);
0655     cSeqSizeEstimate += ZSTD_estimateSubBlockSize_symbolType(fseMetadata->llType, llCodeTable, MaxLL,
0656                                          nbSeq, fseTables->litlengthCTable, LL_bits,
0657                                          LL_defaultNorm, LL_defaultNormLog, MaxLL,
0658                                          workspace, wkspSize);
0659     cSeqSizeEstimate += ZSTD_estimateSubBlockSize_symbolType(fseMetadata->mlType, mlCodeTable, MaxML,
0660                                          nbSeq, fseTables->matchlengthCTable, ML_bits,
0661                                          ML_defaultNorm, ML_defaultNormLog, MaxML,
0662                                          workspace, wkspSize);
0663     if (writeEntropy) cSeqSizeEstimate += fseMetadata->fseTablesSize;
0664     return cSeqSizeEstimate + sequencesSectionHeaderSize;
0665 }
0666 
0667 static size_t ZSTD_estimateSubBlockSize(const BYTE* literals, size_t litSize,
0668                                         const BYTE* ofCodeTable,
0669                                         const BYTE* llCodeTable,
0670                                         const BYTE* mlCodeTable,
0671                                         size_t nbSeq,
0672                                         const ZSTD_entropyCTables_t* entropy,
0673                                         const ZSTD_entropyCTablesMetadata_t* entropyMetadata,
0674                                         void* workspace, size_t wkspSize,
0675                                         int writeLitEntropy, int writeSeqEntropy) {
0676     size_t cSizeEstimate = 0;
0677     cSizeEstimate += ZSTD_estimateSubBlockSize_literal(literals, litSize,
0678                                                          &entropy->huf, &entropyMetadata->hufMetadata,
0679                                                          workspace, wkspSize, writeLitEntropy);
0680     cSizeEstimate += ZSTD_estimateSubBlockSize_sequences(ofCodeTable, llCodeTable, mlCodeTable,
0681                                                          nbSeq, &entropy->fse, &entropyMetadata->fseMetadata,
0682                                                          workspace, wkspSize, writeSeqEntropy);
0683     return cSizeEstimate + ZSTD_blockHeaderSize;
0684 }
0685 
0686 static int ZSTD_needSequenceEntropyTables(ZSTD_fseCTablesMetadata_t const* fseMetadata)
0687 {
0688     if (fseMetadata->llType == set_compressed || fseMetadata->llType == set_rle)
0689         return 1;
0690     if (fseMetadata->mlType == set_compressed || fseMetadata->mlType == set_rle)
0691         return 1;
0692     if (fseMetadata->ofType == set_compressed || fseMetadata->ofType == set_rle)
0693         return 1;
0694     return 0;
0695 }
0696 
0697 /* ZSTD_compressSubBlock_multi() :
0698  *  Breaks super-block into multiple sub-blocks and compresses them.
0699  *  Entropy will be written to the first block.
0700  *  The following blocks will use repeat mode to compress.
0701  *  All sub-blocks are compressed blocks (no raw or rle blocks).
0702  *  @return : compressed size of the super block (which is multiple ZSTD blocks)
0703  *            Or 0 if it failed to compress. */
0704 static size_t ZSTD_compressSubBlock_multi(const seqStore_t* seqStorePtr,
0705                             const ZSTD_compressedBlockState_t* prevCBlock,
0706                             ZSTD_compressedBlockState_t* nextCBlock,
0707                             const ZSTD_entropyCTablesMetadata_t* entropyMetadata,
0708                             const ZSTD_CCtx_params* cctxParams,
0709                                   void* dst, size_t dstCapacity,
0710                             const void* src, size_t srcSize,
0711                             const int bmi2, U32 lastBlock,
0712                             void* workspace, size_t wkspSize)
0713 {
0714     const seqDef* const sstart = seqStorePtr->sequencesStart;
0715     const seqDef* const send = seqStorePtr->sequences;
0716     const seqDef* sp = sstart;
0717     const BYTE* const lstart = seqStorePtr->litStart;
0718     const BYTE* const lend = seqStorePtr->lit;
0719     const BYTE* lp = lstart;
0720     BYTE const* ip = (BYTE const*)src;
0721     BYTE const* const iend = ip + srcSize;
0722     BYTE* const ostart = (BYTE*)dst;
0723     BYTE* const oend = ostart + dstCapacity;
0724     BYTE* op = ostart;
0725     const BYTE* llCodePtr = seqStorePtr->llCode;
0726     const BYTE* mlCodePtr = seqStorePtr->mlCode;
0727     const BYTE* ofCodePtr = seqStorePtr->ofCode;
0728     size_t targetCBlockSize = cctxParams->targetCBlockSize;
0729     size_t litSize, seqCount;
0730     int writeLitEntropy = entropyMetadata->hufMetadata.hType == set_compressed;
0731     int writeSeqEntropy = 1;
0732     int lastSequence = 0;
0733 
0734     DEBUGLOG(5, "ZSTD_compressSubBlock_multi (litSize=%u, nbSeq=%u)",
0735                 (unsigned)(lend-lp), (unsigned)(send-sstart));
0736 
0737     litSize = 0;
0738     seqCount = 0;
0739     do {
0740         size_t cBlockSizeEstimate = 0;
0741         if (sstart == send) {
0742             lastSequence = 1;
0743         } else {
0744             const seqDef* const sequence = sp + seqCount;
0745             lastSequence = sequence == send - 1;
0746             litSize += ZSTD_getSequenceLength(seqStorePtr, sequence).litLength;
0747             seqCount++;
0748         }
0749         if (lastSequence) {
0750             assert(lp <= lend);
0751             assert(litSize <= (size_t)(lend - lp));
0752             litSize = (size_t)(lend - lp);
0753         }
0754         /* I think there is an optimization opportunity here.
0755          * Calling ZSTD_estimateSubBlockSize for every sequence can be wasteful
0756          * since it recalculates estimate from scratch.
0757          * For example, it would recount literal distribution and symbol codes everytime.
0758          */
0759         cBlockSizeEstimate = ZSTD_estimateSubBlockSize(lp, litSize, ofCodePtr, llCodePtr, mlCodePtr, seqCount,
0760                                                        &nextCBlock->entropy, entropyMetadata,
0761                                                        workspace, wkspSize, writeLitEntropy, writeSeqEntropy);
0762         if (cBlockSizeEstimate > targetCBlockSize || lastSequence) {
0763             int litEntropyWritten = 0;
0764             int seqEntropyWritten = 0;
0765             const size_t decompressedSize = ZSTD_seqDecompressedSize(seqStorePtr, sp, seqCount, litSize, lastSequence);
0766             const size_t cSize = ZSTD_compressSubBlock(&nextCBlock->entropy, entropyMetadata,
0767                                                        sp, seqCount,
0768                                                        lp, litSize,
0769                                                        llCodePtr, mlCodePtr, ofCodePtr,
0770                                                        cctxParams,
0771                                                        op, oend-op,
0772                                                        bmi2, writeLitEntropy, writeSeqEntropy,
0773                                                        &litEntropyWritten, &seqEntropyWritten,
0774                                                        lastBlock && lastSequence);
0775             FORWARD_IF_ERROR(cSize, "ZSTD_compressSubBlock failed");
0776             if (cSize > 0 && cSize < decompressedSize) {
0777                 DEBUGLOG(5, "Committed the sub-block");
0778                 assert(ip + decompressedSize <= iend);
0779                 ip += decompressedSize;
0780                 sp += seqCount;
0781                 lp += litSize;
0782                 op += cSize;
0783                 llCodePtr += seqCount;
0784                 mlCodePtr += seqCount;
0785                 ofCodePtr += seqCount;
0786                 litSize = 0;
0787                 seqCount = 0;
0788                 /* Entropy only needs to be written once */
0789                 if (litEntropyWritten) {
0790                     writeLitEntropy = 0;
0791                 }
0792                 if (seqEntropyWritten) {
0793                     writeSeqEntropy = 0;
0794                 }
0795             }
0796         }
0797     } while (!lastSequence);
0798     if (writeLitEntropy) {
0799         DEBUGLOG(5, "ZSTD_compressSubBlock_multi has literal entropy tables unwritten");
0800         ZSTD_memcpy(&nextCBlock->entropy.huf, &prevCBlock->entropy.huf, sizeof(prevCBlock->entropy.huf));
0801     }
0802     if (writeSeqEntropy && ZSTD_needSequenceEntropyTables(&entropyMetadata->fseMetadata)) {
0803         /* If we haven't written our entropy tables, then we've violated our contract and
0804          * must emit an uncompressed block.
0805          */
0806         DEBUGLOG(5, "ZSTD_compressSubBlock_multi has sequence entropy tables unwritten");
0807         return 0;
0808     }
0809     if (ip < iend) {
0810         size_t const cSize = ZSTD_noCompressBlock(op, oend - op, ip, iend - ip, lastBlock);
0811         DEBUGLOG(5, "ZSTD_compressSubBlock_multi last sub-block uncompressed, %zu bytes", (size_t)(iend - ip));
0812         FORWARD_IF_ERROR(cSize, "ZSTD_noCompressBlock failed");
0813         assert(cSize != 0);
0814         op += cSize;
0815         /* We have to regenerate the repcodes because we've skipped some sequences */
0816         if (sp < send) {
0817             seqDef const* seq;
0818             repcodes_t rep;
0819             ZSTD_memcpy(&rep, prevCBlock->rep, sizeof(rep));
0820             for (seq = sstart; seq < sp; ++seq) {
0821                 rep = ZSTD_updateRep(rep.rep, seq->offset - 1, ZSTD_getSequenceLength(seqStorePtr, seq).litLength == 0);
0822             }
0823             ZSTD_memcpy(nextCBlock->rep, &rep, sizeof(rep));
0824         }
0825     }
0826     DEBUGLOG(5, "ZSTD_compressSubBlock_multi compressed");
0827     return op-ostart;
0828 }
0829 
0830 size_t ZSTD_compressSuperBlock(ZSTD_CCtx* zc,
0831                                void* dst, size_t dstCapacity,
0832                                void const* src, size_t srcSize,
0833                                unsigned lastBlock) {
0834     ZSTD_entropyCTablesMetadata_t entropyMetadata;
0835 
0836     FORWARD_IF_ERROR(ZSTD_buildSuperBlockEntropy(&zc->seqStore,
0837           &zc->blockState.prevCBlock->entropy,
0838           &zc->blockState.nextCBlock->entropy,
0839           &zc->appliedParams,
0840           &entropyMetadata,
0841           zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE /* statically allocated in resetCCtx */), "");
0842 
0843     return ZSTD_compressSubBlock_multi(&zc->seqStore,
0844             zc->blockState.prevCBlock,
0845             zc->blockState.nextCBlock,
0846             &entropyMetadata,
0847             &zc->appliedParams,
0848             dst, dstCapacity,
0849             src, srcSize,
0850             zc->bmi2, lastBlock,
0851             zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE /* statically allocated in resetCCtx */);
0852 }
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