--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/contrib/python-zstandard/zstd/compress/zstd_compress.c Thu Nov 10 21:45:29 2016 -0800
@@ -0,0 +1,3264 @@
+/**
+ * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+
+/*-*************************************
+* Dependencies
+***************************************/
+#include <string.h> /* memset */
+#include "mem.h"
+#define XXH_STATIC_LINKING_ONLY /* XXH64_state_t */
+#include "xxhash.h" /* XXH_reset, update, digest */
+#define FSE_STATIC_LINKING_ONLY /* FSE_encodeSymbol */
+#include "fse.h"
+#define HUF_STATIC_LINKING_ONLY
+#include "huf.h"
+#include "zstd_internal.h" /* includes zstd.h */
+
+
+/*-*************************************
+* Constants
+***************************************/
+static const U32 g_searchStrength = 8; /* control skip over incompressible data */
+#define HASH_READ_SIZE 8
+typedef enum { ZSTDcs_created=0, ZSTDcs_init, ZSTDcs_ongoing, ZSTDcs_ending } ZSTD_compressionStage_e;
+
+
+/*-*************************************
+* Helper functions
+***************************************/
+size_t ZSTD_compressBound(size_t srcSize) { return FSE_compressBound(srcSize) + 12; }
+
+
+/*-*************************************
+* Sequence storage
+***************************************/
+static void ZSTD_resetSeqStore(seqStore_t* ssPtr)
+{
+ ssPtr->lit = ssPtr->litStart;
+ ssPtr->sequences = ssPtr->sequencesStart;
+ ssPtr->longLengthID = 0;
+}
+
+
+/*-*************************************
+* Context memory management
+***************************************/
+struct ZSTD_CCtx_s
+{
+ const BYTE* nextSrc; /* next block here to continue on current prefix */
+ const BYTE* base; /* All regular indexes relative to this position */
+ const BYTE* dictBase; /* extDict indexes relative to this position */
+ U32 dictLimit; /* below that point, need extDict */
+ U32 lowLimit; /* below that point, no more data */
+ U32 nextToUpdate; /* index from which to continue dictionary update */
+ U32 nextToUpdate3; /* index from which to continue dictionary update */
+ U32 hashLog3; /* dispatch table : larger == faster, more memory */
+ U32 loadedDictEnd;
+ ZSTD_compressionStage_e stage;
+ U32 rep[ZSTD_REP_NUM];
+ U32 savedRep[ZSTD_REP_NUM];
+ U32 dictID;
+ ZSTD_parameters params;
+ void* workSpace;
+ size_t workSpaceSize;
+ size_t blockSize;
+ U64 frameContentSize;
+ XXH64_state_t xxhState;
+ ZSTD_customMem customMem;
+
+ seqStore_t seqStore; /* sequences storage ptrs */
+ U32* hashTable;
+ U32* hashTable3;
+ U32* chainTable;
+ HUF_CElt* hufTable;
+ U32 flagStaticTables;
+ FSE_CTable offcodeCTable [FSE_CTABLE_SIZE_U32(OffFSELog, MaxOff)];
+ FSE_CTable matchlengthCTable[FSE_CTABLE_SIZE_U32(MLFSELog, MaxML)];
+ FSE_CTable litlengthCTable [FSE_CTABLE_SIZE_U32(LLFSELog, MaxLL)];
+};
+
+ZSTD_CCtx* ZSTD_createCCtx(void)
+{
+ return ZSTD_createCCtx_advanced(defaultCustomMem);
+}
+
+ZSTD_CCtx* ZSTD_createCCtx_advanced(ZSTD_customMem customMem)
+{
+ ZSTD_CCtx* cctx;
+
+ if (!customMem.customAlloc && !customMem.customFree) customMem = defaultCustomMem;
+ if (!customMem.customAlloc || !customMem.customFree) return NULL;
+
+ cctx = (ZSTD_CCtx*) ZSTD_malloc(sizeof(ZSTD_CCtx), customMem);
+ if (!cctx) return NULL;
+ memset(cctx, 0, sizeof(ZSTD_CCtx));
+ memcpy(&(cctx->customMem), &customMem, sizeof(customMem));
+ return cctx;
+}
+
+size_t ZSTD_freeCCtx(ZSTD_CCtx* cctx)
+{
+ if (cctx==NULL) return 0; /* support free on NULL */
+ ZSTD_free(cctx->workSpace, cctx->customMem);
+ ZSTD_free(cctx, cctx->customMem);
+ return 0; /* reserved as a potential error code in the future */
+}
+
+size_t ZSTD_sizeof_CCtx(const ZSTD_CCtx* cctx)
+{
+ if (cctx==NULL) return 0; /* support sizeof on NULL */
+ return sizeof(*cctx) + cctx->workSpaceSize;
+}
+
+const seqStore_t* ZSTD_getSeqStore(const ZSTD_CCtx* ctx) /* hidden interface */
+{
+ return &(ctx->seqStore);
+}
+
+static ZSTD_parameters ZSTD_getParamsFromCCtx(const ZSTD_CCtx* cctx)
+{
+ return cctx->params;
+}
+
+
+/** ZSTD_checkParams() :
+ ensure param values remain within authorized range.
+ @return : 0, or an error code if one value is beyond authorized range */
+size_t ZSTD_checkCParams(ZSTD_compressionParameters cParams)
+{
+# define CLAMPCHECK(val,min,max) { if ((val<min) | (val>max)) return ERROR(compressionParameter_unsupported); }
+ CLAMPCHECK(cParams.windowLog, ZSTD_WINDOWLOG_MIN, ZSTD_WINDOWLOG_MAX);
+ CLAMPCHECK(cParams.chainLog, ZSTD_CHAINLOG_MIN, ZSTD_CHAINLOG_MAX);
+ CLAMPCHECK(cParams.hashLog, ZSTD_HASHLOG_MIN, ZSTD_HASHLOG_MAX);
+ CLAMPCHECK(cParams.searchLog, ZSTD_SEARCHLOG_MIN, ZSTD_SEARCHLOG_MAX);
+ { U32 const searchLengthMin = ((cParams.strategy == ZSTD_fast) | (cParams.strategy == ZSTD_greedy)) ? ZSTD_SEARCHLENGTH_MIN+1 : ZSTD_SEARCHLENGTH_MIN;
+ U32 const searchLengthMax = (cParams.strategy == ZSTD_fast) ? ZSTD_SEARCHLENGTH_MAX : ZSTD_SEARCHLENGTH_MAX-1;
+ CLAMPCHECK(cParams.searchLength, searchLengthMin, searchLengthMax); }
+ CLAMPCHECK(cParams.targetLength, ZSTD_TARGETLENGTH_MIN, ZSTD_TARGETLENGTH_MAX);
+ if ((U32)(cParams.strategy) > (U32)ZSTD_btopt2) return ERROR(compressionParameter_unsupported);
+ return 0;
+}
+
+
+/** ZSTD_adjustCParams() :
+ optimize `cPar` for a given input (`srcSize` and `dictSize`).
+ mostly downsizing to reduce memory consumption and initialization.
+ Both `srcSize` and `dictSize` are optional (use 0 if unknown),
+ but if both are 0, no optimization can be done.
+ Note : cPar is considered validated at this stage. Use ZSTD_checkParams() to ensure that. */
+ZSTD_compressionParameters ZSTD_adjustCParams(ZSTD_compressionParameters cPar, unsigned long long srcSize, size_t dictSize)
+{
+ if (srcSize+dictSize == 0) return cPar; /* no size information available : no adjustment */
+
+ /* resize params, to use less memory when necessary */
+ { U32 const minSrcSize = (srcSize==0) ? 500 : 0;
+ U64 const rSize = srcSize + dictSize + minSrcSize;
+ if (rSize < ((U64)1<<ZSTD_WINDOWLOG_MAX)) {
+ U32 const srcLog = MAX(ZSTD_HASHLOG_MIN, ZSTD_highbit32((U32)(rSize)-1) + 1);
+ if (cPar.windowLog > srcLog) cPar.windowLog = srcLog;
+ } }
+ if (cPar.hashLog > cPar.windowLog) cPar.hashLog = cPar.windowLog;
+ { U32 const btPlus = (cPar.strategy == ZSTD_btlazy2) | (cPar.strategy == ZSTD_btopt) | (cPar.strategy == ZSTD_btopt2);
+ U32 const maxChainLog = cPar.windowLog+btPlus;
+ if (cPar.chainLog > maxChainLog) cPar.chainLog = maxChainLog; } /* <= ZSTD_CHAINLOG_MAX */
+
+ if (cPar.windowLog < ZSTD_WINDOWLOG_ABSOLUTEMIN) cPar.windowLog = ZSTD_WINDOWLOG_ABSOLUTEMIN; /* required for frame header */
+
+ return cPar;
+}
+
+
+size_t ZSTD_estimateCCtxSize(ZSTD_compressionParameters cParams)
+{
+ size_t const blockSize = MIN(ZSTD_BLOCKSIZE_ABSOLUTEMAX, (size_t)1 << cParams.windowLog);
+ U32 const divider = (cParams.searchLength==3) ? 3 : 4;
+ size_t const maxNbSeq = blockSize / divider;
+ size_t const tokenSpace = blockSize + 11*maxNbSeq;
+
+ size_t const chainSize = (cParams.strategy == ZSTD_fast) ? 0 : (1 << cParams.chainLog);
+ size_t const hSize = ((size_t)1) << cParams.hashLog;
+ U32 const hashLog3 = (cParams.searchLength>3) ? 0 : MIN(ZSTD_HASHLOG3_MAX, cParams.windowLog);
+ size_t const h3Size = ((size_t)1) << hashLog3;
+ size_t const tableSpace = (chainSize + hSize + h3Size) * sizeof(U32);
+
+ size_t const optSpace = ((MaxML+1) + (MaxLL+1) + (MaxOff+1) + (1<<Litbits))*sizeof(U32)
+ + (ZSTD_OPT_NUM+1)*(sizeof(ZSTD_match_t) + sizeof(ZSTD_optimal_t));
+ size_t const neededSpace = tableSpace + (256*sizeof(U32)) /* huffTable */ + tokenSpace
+ + (((cParams.strategy == ZSTD_btopt) || (cParams.strategy == ZSTD_btopt2)) ? optSpace : 0);
+
+ return sizeof(ZSTD_CCtx) + neededSpace;
+}
+
+
+static U32 ZSTD_equivalentParams(ZSTD_parameters param1, ZSTD_parameters param2)
+{
+ return (param1.cParams.hashLog == param2.cParams.hashLog)
+ & (param1.cParams.chainLog == param2.cParams.chainLog)
+ & (param1.cParams.strategy == param2.cParams.strategy)
+ & ((param1.cParams.searchLength==3) == (param2.cParams.searchLength==3));
+}
+
+/*! ZSTD_continueCCtx() :
+ reuse CCtx without reset (note : requires no dictionary) */
+static size_t ZSTD_continueCCtx(ZSTD_CCtx* cctx, ZSTD_parameters params, U64 frameContentSize)
+{
+ U32 const end = (U32)(cctx->nextSrc - cctx->base);
+ cctx->params = params;
+ cctx->frameContentSize = frameContentSize;
+ cctx->lowLimit = end;
+ cctx->dictLimit = end;
+ cctx->nextToUpdate = end+1;
+ cctx->stage = ZSTDcs_init;
+ cctx->dictID = 0;
+ cctx->loadedDictEnd = 0;
+ { int i; for (i=0; i<ZSTD_REP_NUM; i++) cctx->rep[i] = repStartValue[i]; }
+ cctx->seqStore.litLengthSum = 0; /* force reset of btopt stats */
+ XXH64_reset(&cctx->xxhState, 0);
+ return 0;
+}
+
+typedef enum { ZSTDcrp_continue, ZSTDcrp_noMemset, ZSTDcrp_fullReset } ZSTD_compResetPolicy_e;
+
+/*! ZSTD_resetCCtx_advanced() :
+ note : 'params' must be validated */
+static size_t ZSTD_resetCCtx_advanced (ZSTD_CCtx* zc,
+ ZSTD_parameters params, U64 frameContentSize,
+ ZSTD_compResetPolicy_e const crp)
+{
+ if (crp == ZSTDcrp_continue)
+ if (ZSTD_equivalentParams(params, zc->params))
+ return ZSTD_continueCCtx(zc, params, frameContentSize);
+
+ { size_t const blockSize = MIN(ZSTD_BLOCKSIZE_ABSOLUTEMAX, (size_t)1 << params.cParams.windowLog);
+ U32 const divider = (params.cParams.searchLength==3) ? 3 : 4;
+ size_t const maxNbSeq = blockSize / divider;
+ size_t const tokenSpace = blockSize + 11*maxNbSeq;
+ size_t const chainSize = (params.cParams.strategy == ZSTD_fast) ? 0 : (1 << params.cParams.chainLog);
+ size_t const hSize = ((size_t)1) << params.cParams.hashLog;
+ U32 const hashLog3 = (params.cParams.searchLength>3) ? 0 : MIN(ZSTD_HASHLOG3_MAX, params.cParams.windowLog);
+ size_t const h3Size = ((size_t)1) << hashLog3;
+ size_t const tableSpace = (chainSize + hSize + h3Size) * sizeof(U32);
+ void* ptr;
+
+ /* Check if workSpace is large enough, alloc a new one if needed */
+ { size_t const optSpace = ((MaxML+1) + (MaxLL+1) + (MaxOff+1) + (1<<Litbits))*sizeof(U32)
+ + (ZSTD_OPT_NUM+1)*(sizeof(ZSTD_match_t) + sizeof(ZSTD_optimal_t));
+ size_t const neededSpace = tableSpace + (256*sizeof(U32)) /* huffTable */ + tokenSpace
+ + (((params.cParams.strategy == ZSTD_btopt) || (params.cParams.strategy == ZSTD_btopt2)) ? optSpace : 0);
+ if (zc->workSpaceSize < neededSpace) {
+ ZSTD_free(zc->workSpace, zc->customMem);
+ zc->workSpace = ZSTD_malloc(neededSpace, zc->customMem);
+ if (zc->workSpace == NULL) return ERROR(memory_allocation);
+ zc->workSpaceSize = neededSpace;
+ } }
+
+ if (crp!=ZSTDcrp_noMemset) memset(zc->workSpace, 0, tableSpace); /* reset tables only */
+ XXH64_reset(&zc->xxhState, 0);
+ zc->hashLog3 = hashLog3;
+ zc->hashTable = (U32*)(zc->workSpace);
+ zc->chainTable = zc->hashTable + hSize;
+ zc->hashTable3 = zc->chainTable + chainSize;
+ ptr = zc->hashTable3 + h3Size;
+ zc->hufTable = (HUF_CElt*)ptr;
+ zc->flagStaticTables = 0;
+ ptr = ((U32*)ptr) + 256; /* note : HUF_CElt* is incomplete type, size is simulated using U32 */
+
+ zc->nextToUpdate = 1;
+ zc->nextSrc = NULL;
+ zc->base = NULL;
+ zc->dictBase = NULL;
+ zc->dictLimit = 0;
+ zc->lowLimit = 0;
+ zc->params = params;
+ zc->blockSize = blockSize;
+ zc->frameContentSize = frameContentSize;
+ { int i; for (i=0; i<ZSTD_REP_NUM; i++) zc->rep[i] = repStartValue[i]; }
+
+ if ((params.cParams.strategy == ZSTD_btopt) || (params.cParams.strategy == ZSTD_btopt2)) {
+ zc->seqStore.litFreq = (U32*)ptr;
+ zc->seqStore.litLengthFreq = zc->seqStore.litFreq + (1<<Litbits);
+ zc->seqStore.matchLengthFreq = zc->seqStore.litLengthFreq + (MaxLL+1);
+ zc->seqStore.offCodeFreq = zc->seqStore.matchLengthFreq + (MaxML+1);
+ ptr = zc->seqStore.offCodeFreq + (MaxOff+1);
+ zc->seqStore.matchTable = (ZSTD_match_t*)ptr;
+ ptr = zc->seqStore.matchTable + ZSTD_OPT_NUM+1;
+ zc->seqStore.priceTable = (ZSTD_optimal_t*)ptr;
+ ptr = zc->seqStore.priceTable + ZSTD_OPT_NUM+1;
+ zc->seqStore.litLengthSum = 0;
+ }
+ zc->seqStore.sequencesStart = (seqDef*)ptr;
+ ptr = zc->seqStore.sequencesStart + maxNbSeq;
+ zc->seqStore.llCode = (BYTE*) ptr;
+ zc->seqStore.mlCode = zc->seqStore.llCode + maxNbSeq;
+ zc->seqStore.ofCode = zc->seqStore.mlCode + maxNbSeq;
+ zc->seqStore.litStart = zc->seqStore.ofCode + maxNbSeq;
+
+ zc->stage = ZSTDcs_init;
+ zc->dictID = 0;
+ zc->loadedDictEnd = 0;
+
+ return 0;
+ }
+}
+
+
+/*! ZSTD_copyCCtx() :
+* Duplicate an existing context `srcCCtx` into another one `dstCCtx`.
+* Only works during stage ZSTDcs_init (i.e. after creation, but before first call to ZSTD_compressContinue()).
+* @return : 0, or an error code */
+size_t ZSTD_copyCCtx(ZSTD_CCtx* dstCCtx, const ZSTD_CCtx* srcCCtx, unsigned long long pledgedSrcSize)
+{
+ if (srcCCtx->stage!=ZSTDcs_init) return ERROR(stage_wrong);
+
+ memcpy(&dstCCtx->customMem, &srcCCtx->customMem, sizeof(ZSTD_customMem));
+ ZSTD_resetCCtx_advanced(dstCCtx, srcCCtx->params, pledgedSrcSize, ZSTDcrp_noMemset);
+
+ /* copy tables */
+ { size_t const chainSize = (srcCCtx->params.cParams.strategy == ZSTD_fast) ? 0 : (1 << srcCCtx->params.cParams.chainLog);
+ size_t const hSize = ((size_t)1) << srcCCtx->params.cParams.hashLog;
+ size_t const h3Size = (size_t)1 << srcCCtx->hashLog3;
+ size_t const tableSpace = (chainSize + hSize + h3Size) * sizeof(U32);
+ memcpy(dstCCtx->workSpace, srcCCtx->workSpace, tableSpace);
+ }
+
+ /* copy dictionary offsets */
+ dstCCtx->nextToUpdate = srcCCtx->nextToUpdate;
+ dstCCtx->nextToUpdate3= srcCCtx->nextToUpdate3;
+ dstCCtx->nextSrc = srcCCtx->nextSrc;
+ dstCCtx->base = srcCCtx->base;
+ dstCCtx->dictBase = srcCCtx->dictBase;
+ dstCCtx->dictLimit = srcCCtx->dictLimit;
+ dstCCtx->lowLimit = srcCCtx->lowLimit;
+ dstCCtx->loadedDictEnd= srcCCtx->loadedDictEnd;
+ dstCCtx->dictID = srcCCtx->dictID;
+
+ /* copy entropy tables */
+ dstCCtx->flagStaticTables = srcCCtx->flagStaticTables;
+ if (srcCCtx->flagStaticTables) {
+ memcpy(dstCCtx->hufTable, srcCCtx->hufTable, 256*4);
+ memcpy(dstCCtx->litlengthCTable, srcCCtx->litlengthCTable, sizeof(dstCCtx->litlengthCTable));
+ memcpy(dstCCtx->matchlengthCTable, srcCCtx->matchlengthCTable, sizeof(dstCCtx->matchlengthCTable));
+ memcpy(dstCCtx->offcodeCTable, srcCCtx->offcodeCTable, sizeof(dstCCtx->offcodeCTable));
+ }
+
+ return 0;
+}
+
+
+/*! ZSTD_reduceTable() :
+* reduce table indexes by `reducerValue` */
+static void ZSTD_reduceTable (U32* const table, U32 const size, U32 const reducerValue)
+{
+ U32 u;
+ for (u=0 ; u < size ; u++) {
+ if (table[u] < reducerValue) table[u] = 0;
+ else table[u] -= reducerValue;
+ }
+}
+
+/*! ZSTD_reduceIndex() :
+* rescale all indexes to avoid future overflow (indexes are U32) */
+static void ZSTD_reduceIndex (ZSTD_CCtx* zc, const U32 reducerValue)
+{
+ { U32 const hSize = 1 << zc->params.cParams.hashLog;
+ ZSTD_reduceTable(zc->hashTable, hSize, reducerValue); }
+
+ { U32 const chainSize = (zc->params.cParams.strategy == ZSTD_fast) ? 0 : (1 << zc->params.cParams.chainLog);
+ ZSTD_reduceTable(zc->chainTable, chainSize, reducerValue); }
+
+ { U32 const h3Size = (zc->hashLog3) ? 1 << zc->hashLog3 : 0;
+ ZSTD_reduceTable(zc->hashTable3, h3Size, reducerValue); }
+}
+
+
+/*-*******************************************************
+* Block entropic compression
+*********************************************************/
+
+/* See doc/zstd_compression_format.md for detailed format description */
+
+size_t ZSTD_noCompressBlock (void* dst, size_t dstCapacity, const void* src, size_t srcSize)
+{
+ if (srcSize + ZSTD_blockHeaderSize > dstCapacity) return ERROR(dstSize_tooSmall);
+ memcpy((BYTE*)dst + ZSTD_blockHeaderSize, src, srcSize);
+ MEM_writeLE24(dst, (U32)(srcSize << 2) + (U32)bt_raw);
+ return ZSTD_blockHeaderSize+srcSize;
+}
+
+
+static size_t ZSTD_noCompressLiterals (void* dst, size_t dstCapacity, const void* src, size_t srcSize)
+{
+ BYTE* const ostart = (BYTE* const)dst;
+ U32 const flSize = 1 + (srcSize>31) + (srcSize>4095);
+
+ if (srcSize + flSize > dstCapacity) return ERROR(dstSize_tooSmall);
+
+ switch(flSize)
+ {
+ case 1: /* 2 - 1 - 5 */
+ ostart[0] = (BYTE)((U32)set_basic + (srcSize<<3));
+ break;
+ case 2: /* 2 - 2 - 12 */
+ MEM_writeLE16(ostart, (U16)((U32)set_basic + (1<<2) + (srcSize<<4)));
+ break;
+ default: /*note : should not be necessary : flSize is within {1,2,3} */
+ case 3: /* 2 - 2 - 20 */
+ MEM_writeLE32(ostart, (U32)((U32)set_basic + (3<<2) + (srcSize<<4)));
+ break;
+ }
+
+ memcpy(ostart + flSize, src, srcSize);
+ return srcSize + flSize;
+}
+
+static size_t ZSTD_compressRleLiteralsBlock (void* dst, size_t dstCapacity, const void* src, size_t srcSize)
+{
+ BYTE* const ostart = (BYTE* const)dst;
+ U32 const flSize = 1 + (srcSize>31) + (srcSize>4095);
+
+ (void)dstCapacity; /* dstCapacity already guaranteed to be >=4, hence large enough */
+
+ switch(flSize)
+ {
+ case 1: /* 2 - 1 - 5 */
+ ostart[0] = (BYTE)((U32)set_rle + (srcSize<<3));
+ break;
+ case 2: /* 2 - 2 - 12 */
+ MEM_writeLE16(ostart, (U16)((U32)set_rle + (1<<2) + (srcSize<<4)));
+ break;
+ default: /*note : should not be necessary : flSize is necessarily within {1,2,3} */
+ case 3: /* 2 - 2 - 20 */
+ MEM_writeLE32(ostart, (U32)((U32)set_rle + (3<<2) + (srcSize<<4)));
+ break;
+ }
+
+ ostart[flSize] = *(const BYTE*)src;
+ return flSize+1;
+}
+
+
+static size_t ZSTD_minGain(size_t srcSize) { return (srcSize >> 6) + 2; }
+
+static size_t ZSTD_compressLiterals (ZSTD_CCtx* zc,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize)
+{
+ size_t const minGain = ZSTD_minGain(srcSize);
+ size_t const lhSize = 3 + (srcSize >= 1 KB) + (srcSize >= 16 KB);
+ BYTE* const ostart = (BYTE*)dst;
+ U32 singleStream = srcSize < 256;
+ symbolEncodingType_e hType = set_compressed;
+ size_t cLitSize;
+
+
+ /* small ? don't even attempt compression (speed opt) */
+# define LITERAL_NOENTROPY 63
+ { size_t const minLitSize = zc->flagStaticTables ? 6 : LITERAL_NOENTROPY;
+ if (srcSize <= minLitSize) return ZSTD_noCompressLiterals(dst, dstCapacity, src, srcSize);
+ }
+
+ if (dstCapacity < lhSize+1) return ERROR(dstSize_tooSmall); /* not enough space for compression */
+ if (zc->flagStaticTables && (lhSize==3)) {
+ hType = set_repeat;
+ singleStream = 1;
+ cLitSize = HUF_compress1X_usingCTable(ostart+lhSize, dstCapacity-lhSize, src, srcSize, zc->hufTable);
+ } else {
+ cLitSize = singleStream ? HUF_compress1X(ostart+lhSize, dstCapacity-lhSize, src, srcSize, 255, 11)
+ : HUF_compress2 (ostart+lhSize, dstCapacity-lhSize, src, srcSize, 255, 11);
+ }
+
+ if ((cLitSize==0) | (cLitSize >= srcSize - minGain))
+ return ZSTD_noCompressLiterals(dst, dstCapacity, src, srcSize);
+ if (cLitSize==1)
+ return ZSTD_compressRleLiteralsBlock(dst, dstCapacity, src, srcSize);
+
+ /* Build header */
+ switch(lhSize)
+ {
+ case 3: /* 2 - 2 - 10 - 10 */
+ { U32 const lhc = hType + ((!singleStream) << 2) + ((U32)srcSize<<4) + ((U32)cLitSize<<14);
+ MEM_writeLE24(ostart, lhc);
+ break;
+ }
+ case 4: /* 2 - 2 - 14 - 14 */
+ { U32 const lhc = hType + (2 << 2) + ((U32)srcSize<<4) + ((U32)cLitSize<<18);
+ MEM_writeLE32(ostart, lhc);
+ break;
+ }
+ default: /* should not be necessary, lhSize is only {3,4,5} */
+ case 5: /* 2 - 2 - 18 - 18 */
+ { U32 const lhc = hType + (3 << 2) + ((U32)srcSize<<4) + ((U32)cLitSize<<22);
+ MEM_writeLE32(ostart, lhc);
+ ostart[4] = (BYTE)(cLitSize >> 10);
+ break;
+ }
+ }
+ return lhSize+cLitSize;
+}
+
+static const BYTE LL_Code[64] = { 0, 1, 2, 3, 4, 5, 6, 7,
+ 8, 9, 10, 11, 12, 13, 14, 15,
+ 16, 16, 17, 17, 18, 18, 19, 19,
+ 20, 20, 20, 20, 21, 21, 21, 21,
+ 22, 22, 22, 22, 22, 22, 22, 22,
+ 23, 23, 23, 23, 23, 23, 23, 23,
+ 24, 24, 24, 24, 24, 24, 24, 24,
+ 24, 24, 24, 24, 24, 24, 24, 24 };
+
+static const BYTE ML_Code[128] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+ 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
+ 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 36, 36, 37, 37, 37, 37,
+ 38, 38, 38, 38, 38, 38, 38, 38, 39, 39, 39, 39, 39, 39, 39, 39,
+ 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40,
+ 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41,
+ 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42,
+ 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42 };
+
+
+void ZSTD_seqToCodes(const seqStore_t* seqStorePtr)
+{
+ BYTE const LL_deltaCode = 19;
+ BYTE const ML_deltaCode = 36;
+ const seqDef* const sequences = seqStorePtr->sequencesStart;
+ BYTE* const llCodeTable = seqStorePtr->llCode;
+ BYTE* const ofCodeTable = seqStorePtr->ofCode;
+ BYTE* const mlCodeTable = seqStorePtr->mlCode;
+ U32 const nbSeq = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
+ U32 u;
+ for (u=0; u<nbSeq; u++) {
+ U32 const llv = sequences[u].litLength;
+ U32 const mlv = sequences[u].matchLength;
+ llCodeTable[u] = (llv> 63) ? (BYTE)ZSTD_highbit32(llv) + LL_deltaCode : LL_Code[llv];
+ ofCodeTable[u] = (BYTE)ZSTD_highbit32(sequences[u].offset);
+ mlCodeTable[u] = (mlv>127) ? (BYTE)ZSTD_highbit32(mlv) + ML_deltaCode : ML_Code[mlv];
+ }
+ if (seqStorePtr->longLengthID==1)
+ llCodeTable[seqStorePtr->longLengthPos] = MaxLL;
+ if (seqStorePtr->longLengthID==2)
+ mlCodeTable[seqStorePtr->longLengthPos] = MaxML;
+}
+
+
+size_t ZSTD_compressSequences(ZSTD_CCtx* zc,
+ void* dst, size_t dstCapacity,
+ size_t srcSize)
+{
+ const seqStore_t* seqStorePtr = &(zc->seqStore);
+ U32 count[MaxSeq+1];
+ S16 norm[MaxSeq+1];
+ FSE_CTable* CTable_LitLength = zc->litlengthCTable;
+ FSE_CTable* CTable_OffsetBits = zc->offcodeCTable;
+ FSE_CTable* CTable_MatchLength = zc->matchlengthCTable;
+ U32 LLtype, Offtype, MLtype; /* compressed, raw or rle */
+ const seqDef* const sequences = seqStorePtr->sequencesStart;
+ const BYTE* const ofCodeTable = seqStorePtr->ofCode;
+ const BYTE* const llCodeTable = seqStorePtr->llCode;
+ const BYTE* const mlCodeTable = seqStorePtr->mlCode;
+ BYTE* const ostart = (BYTE*)dst;
+ BYTE* const oend = ostart + dstCapacity;
+ BYTE* op = ostart;
+ size_t const nbSeq = seqStorePtr->sequences - seqStorePtr->sequencesStart;
+ BYTE* seqHead;
+
+ /* Compress literals */
+ { const BYTE* const literals = seqStorePtr->litStart;
+ size_t const litSize = seqStorePtr->lit - literals;
+ size_t const cSize = ZSTD_compressLiterals(zc, op, dstCapacity, literals, litSize);
+ if (ZSTD_isError(cSize)) return cSize;
+ op += cSize;
+ }
+
+ /* Sequences Header */
+ if ((oend-op) < 3 /*max nbSeq Size*/ + 1 /*seqHead */) return ERROR(dstSize_tooSmall);
+ if (nbSeq < 0x7F) *op++ = (BYTE)nbSeq;
+ else if (nbSeq < LONGNBSEQ) op[0] = (BYTE)((nbSeq>>8) + 0x80), op[1] = (BYTE)nbSeq, op+=2;
+ else op[0]=0xFF, MEM_writeLE16(op+1, (U16)(nbSeq - LONGNBSEQ)), op+=3;
+ if (nbSeq==0) goto _check_compressibility;
+
+ /* seqHead : flags for FSE encoding type */
+ seqHead = op++;
+
+#define MIN_SEQ_FOR_DYNAMIC_FSE 64
+#define MAX_SEQ_FOR_STATIC_FSE 1000
+
+ /* convert length/distances into codes */
+ ZSTD_seqToCodes(seqStorePtr);
+
+ /* CTable for Literal Lengths */
+ { U32 max = MaxLL;
+ size_t const mostFrequent = FSE_countFast(count, &max, llCodeTable, nbSeq);
+ if ((mostFrequent == nbSeq) && (nbSeq > 2)) {
+ *op++ = llCodeTable[0];
+ FSE_buildCTable_rle(CTable_LitLength, (BYTE)max);
+ LLtype = set_rle;
+ } 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);
+ LLtype = set_basic;
+ } else {
+ size_t nbSeq_1 = nbSeq;
+ const U32 tableLog = FSE_optimalTableLog(LLFSELog, nbSeq, max);
+ if (count[llCodeTable[nbSeq-1]]>1) { count[llCodeTable[nbSeq-1]]--; nbSeq_1--; }
+ FSE_normalizeCount(norm, tableLog, count, nbSeq_1, max);
+ { 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);
+ LLtype = set_compressed;
+ } }
+
+ /* CTable for Offsets */
+ { U32 max = MaxOff;
+ size_t const mostFrequent = FSE_countFast(count, &max, ofCodeTable, nbSeq);
+ if ((mostFrequent == nbSeq) && (nbSeq > 2)) {
+ *op++ = ofCodeTable[0];
+ FSE_buildCTable_rle(CTable_OffsetBits, (BYTE)max);
+ Offtype = set_rle;
+ } 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);
+ Offtype = set_basic;
+ } else {
+ size_t nbSeq_1 = nbSeq;
+ const U32 tableLog = FSE_optimalTableLog(OffFSELog, nbSeq, max);
+ if (count[ofCodeTable[nbSeq-1]]>1) { count[ofCodeTable[nbSeq-1]]--; nbSeq_1--; }
+ FSE_normalizeCount(norm, tableLog, count, nbSeq_1, max);
+ { 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);
+ Offtype = set_compressed;
+ } }
+
+ /* CTable for MatchLengths */
+ { U32 max = MaxML;
+ size_t const mostFrequent = FSE_countFast(count, &max, mlCodeTable, nbSeq);
+ if ((mostFrequent == nbSeq) && (nbSeq > 2)) {
+ *op++ = *mlCodeTable;
+ FSE_buildCTable_rle(CTable_MatchLength, (BYTE)max);
+ MLtype = set_rle;
+ } 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);
+ MLtype = set_basic;
+ } else {
+ size_t nbSeq_1 = nbSeq;
+ const U32 tableLog = FSE_optimalTableLog(MLFSELog, nbSeq, max);
+ if (count[mlCodeTable[nbSeq-1]]>1) { count[mlCodeTable[nbSeq-1]]--; nbSeq_1--; }
+ FSE_normalizeCount(norm, tableLog, count, nbSeq_1, max);
+ { 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);
+ MLtype = set_compressed;
+ } }
+
+ *seqHead = (BYTE)((LLtype<<6) + (Offtype<<4) + (MLtype<<2));
+ zc->flagStaticTables = 0;
+
+ /* Encoding Sequences */
+ { BIT_CStream_t blockStream;
+ FSE_CState_t stateMatchLength;
+ FSE_CState_t stateOffsetBits;
+ FSE_CState_t stateLitLength;
+
+ CHECK_E(BIT_initCStream(&blockStream, op, oend-op), dstSize_tooSmall); /* not enough space remaining */
+
+ /* first symbols */
+ FSE_initCState2(&stateMatchLength, CTable_MatchLength, mlCodeTable[nbSeq-1]);
+ FSE_initCState2(&stateOffsetBits, CTable_OffsetBits, ofCodeTable[nbSeq-1]);
+ FSE_initCState2(&stateLitLength, CTable_LitLength, llCodeTable[nbSeq-1]);
+ BIT_addBits(&blockStream, sequences[nbSeq-1].litLength, LL_bits[llCodeTable[nbSeq-1]]);
+ if (MEM_32bits()) BIT_flushBits(&blockStream);
+ BIT_addBits(&blockStream, sequences[nbSeq-1].matchLength, ML_bits[mlCodeTable[nbSeq-1]]);
+ if (MEM_32bits()) BIT_flushBits(&blockStream);
+ BIT_addBits(&blockStream, sequences[nbSeq-1].offset, ofCodeTable[nbSeq-1]);
+ BIT_flushBits(&blockStream);
+
+ { size_t n;
+ for (n=nbSeq-2 ; n<nbSeq ; n--) { /* intentional underflow */
+ BYTE const llCode = llCodeTable[n];
+ BYTE const ofCode = ofCodeTable[n];
+ BYTE const mlCode = mlCodeTable[n];
+ U32 const llBits = LL_bits[llCode];
+ U32 const ofBits = ofCode; /* 32b*/ /* 64b*/
+ U32 const mlBits = ML_bits[mlCode];
+ /* (7)*/ /* (7)*/
+ FSE_encodeSymbol(&blockStream, &stateOffsetBits, ofCode); /* 15 */ /* 15 */
+ FSE_encodeSymbol(&blockStream, &stateMatchLength, mlCode); /* 24 */ /* 24 */
+ if (MEM_32bits()) BIT_flushBits(&blockStream); /* (7)*/
+ FSE_encodeSymbol(&blockStream, &stateLitLength, llCode); /* 16 */ /* 33 */
+ if (MEM_32bits() || (ofBits+mlBits+llBits >= 64-7-(LLFSELog+MLFSELog+OffFSELog)))
+ BIT_flushBits(&blockStream); /* (7)*/
+ BIT_addBits(&blockStream, sequences[n].litLength, llBits);
+ if (MEM_32bits() && ((llBits+mlBits)>24)) BIT_flushBits(&blockStream);
+ BIT_addBits(&blockStream, sequences[n].matchLength, mlBits);
+ if (MEM_32bits()) BIT_flushBits(&blockStream); /* (7)*/
+ BIT_addBits(&blockStream, sequences[n].offset, ofBits); /* 31 */
+ BIT_flushBits(&blockStream); /* (7)*/
+ } }
+
+ FSE_flushCState(&blockStream, &stateMatchLength);
+ FSE_flushCState(&blockStream, &stateOffsetBits);
+ FSE_flushCState(&blockStream, &stateLitLength);
+
+ { size_t const streamSize = BIT_closeCStream(&blockStream);
+ if (streamSize==0) return ERROR(dstSize_tooSmall); /* not enough space */
+ op += streamSize;
+ } }
+
+ /* check compressibility */
+_check_compressibility:
+ { size_t const minGain = ZSTD_minGain(srcSize);
+ size_t const maxCSize = srcSize - minGain;
+ if ((size_t)(op-ostart) >= maxCSize) return 0; }
+
+ /* confirm repcodes */
+ { int i; for (i=0; i<ZSTD_REP_NUM; i++) zc->rep[i] = zc->savedRep[i]; }
+
+ return op - ostart;
+}
+
+
+/*! ZSTD_storeSeq() :
+ Store a sequence (literal length, literals, offset code and match length code) into seqStore_t.
+ `offsetCode` : distance to match, or 0 == repCode.
+ `matchCode` : matchLength - MINMATCH
+*/
+MEM_STATIC void ZSTD_storeSeq(seqStore_t* seqStorePtr, size_t litLength, const void* literals, U32 offsetCode, size_t matchCode)
+{
+#if 0 /* for debug */
+ static const BYTE* g_start = NULL;
+ const U32 pos = (U32)(literals - g_start);
+ if (g_start==NULL) g_start = literals;
+ //if ((pos > 1) && (pos < 50000))
+ printf("Cpos %6u :%5u literals & match %3u bytes at distance %6u \n",
+ pos, (U32)litLength, (U32)matchCode+MINMATCH, (U32)offsetCode);
+#endif
+ /* copy Literals */
+ ZSTD_wildcopy(seqStorePtr->lit, literals, litLength);
+ seqStorePtr->lit += litLength;
+
+ /* literal Length */
+ if (litLength>0xFFFF) { seqStorePtr->longLengthID = 1; seqStorePtr->longLengthPos = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart); }
+ seqStorePtr->sequences[0].litLength = (U16)litLength;
+
+ /* match offset */
+ seqStorePtr->sequences[0].offset = offsetCode + 1;
+
+ /* match Length */
+ if (matchCode>0xFFFF) { seqStorePtr->longLengthID = 2; seqStorePtr->longLengthPos = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart); }
+ seqStorePtr->sequences[0].matchLength = (U16)matchCode;
+
+ seqStorePtr->sequences++;
+}
+
+
+/*-*************************************
+* Match length counter
+***************************************/
+static unsigned ZSTD_NbCommonBytes (register size_t val)
+{
+ if (MEM_isLittleEndian()) {
+ if (MEM_64bits()) {
+# if defined(_MSC_VER) && defined(_WIN64)
+ unsigned long r = 0;
+ _BitScanForward64( &r, (U64)val );
+ return (unsigned)(r>>3);
+# elif defined(__GNUC__) && (__GNUC__ >= 3)
+ return (__builtin_ctzll((U64)val) >> 3);
+# else
+ static const int DeBruijnBytePos[64] = { 0, 0, 0, 0, 0, 1, 1, 2, 0, 3, 1, 3, 1, 4, 2, 7, 0, 2, 3, 6, 1, 5, 3, 5, 1, 3, 4, 4, 2, 5, 6, 7, 7, 0, 1, 2, 3, 3, 4, 6, 2, 6, 5, 5, 3, 4, 5, 6, 7, 1, 2, 4, 6, 4, 4, 5, 7, 2, 6, 5, 7, 6, 7, 7 };
+ return DeBruijnBytePos[((U64)((val & -(long long)val) * 0x0218A392CDABBD3FULL)) >> 58];
+# endif
+ } else { /* 32 bits */
+# if defined(_MSC_VER)
+ unsigned long r=0;
+ _BitScanForward( &r, (U32)val );
+ return (unsigned)(r>>3);
+# elif defined(__GNUC__) && (__GNUC__ >= 3)
+ return (__builtin_ctz((U32)val) >> 3);
+# else
+ static const int DeBruijnBytePos[32] = { 0, 0, 3, 0, 3, 1, 3, 0, 3, 2, 2, 1, 3, 2, 0, 1, 3, 3, 1, 2, 2, 2, 2, 0, 3, 1, 2, 0, 1, 0, 1, 1 };
+ return DeBruijnBytePos[((U32)((val & -(S32)val) * 0x077CB531U)) >> 27];
+# endif
+ }
+ } else { /* Big Endian CPU */
+ if (MEM_64bits()) {
+# if defined(_MSC_VER) && defined(_WIN64)
+ unsigned long r = 0;
+ _BitScanReverse64( &r, val );
+ return (unsigned)(r>>3);
+# elif defined(__GNUC__) && (__GNUC__ >= 3)
+ return (__builtin_clzll(val) >> 3);
+# else
+ unsigned r;
+ const unsigned n32 = sizeof(size_t)*4; /* calculate this way due to compiler complaining in 32-bits mode */
+ if (!(val>>n32)) { r=4; } else { r=0; val>>=n32; }
+ if (!(val>>16)) { r+=2; val>>=8; } else { val>>=24; }
+ r += (!val);
+ return r;
+# endif
+ } else { /* 32 bits */
+# if defined(_MSC_VER)
+ unsigned long r = 0;
+ _BitScanReverse( &r, (unsigned long)val );
+ return (unsigned)(r>>3);
+# elif defined(__GNUC__) && (__GNUC__ >= 3)
+ return (__builtin_clz((U32)val) >> 3);
+# else
+ unsigned r;
+ if (!(val>>16)) { r=2; val>>=8; } else { r=0; val>>=24; }
+ r += (!val);
+ return r;
+# endif
+ } }
+}
+
+
+static size_t ZSTD_count(const BYTE* pIn, const BYTE* pMatch, const BYTE* const pInLimit)
+{
+ const BYTE* const pStart = pIn;
+ const BYTE* const pInLoopLimit = pInLimit - (sizeof(size_t)-1);
+
+ while (pIn < pInLoopLimit) {
+ size_t const diff = MEM_readST(pMatch) ^ MEM_readST(pIn);
+ if (!diff) { pIn+=sizeof(size_t); pMatch+=sizeof(size_t); continue; }
+ pIn += ZSTD_NbCommonBytes(diff);
+ return (size_t)(pIn - pStart);
+ }
+ if (MEM_64bits()) if ((pIn<(pInLimit-3)) && (MEM_read32(pMatch) == MEM_read32(pIn))) { pIn+=4; pMatch+=4; }
+ if ((pIn<(pInLimit-1)) && (MEM_read16(pMatch) == MEM_read16(pIn))) { pIn+=2; pMatch+=2; }
+ if ((pIn<pInLimit) && (*pMatch == *pIn)) pIn++;
+ return (size_t)(pIn - pStart);
+}
+
+/** ZSTD_count_2segments() :
+* can count match length with `ip` & `match` in 2 different segments.
+* convention : on reaching mEnd, match count continue starting from iStart
+*/
+static size_t ZSTD_count_2segments(const BYTE* ip, const BYTE* match, const BYTE* iEnd, const BYTE* mEnd, const BYTE* iStart)
+{
+ const BYTE* const vEnd = MIN( ip + (mEnd - match), iEnd);
+ size_t const matchLength = ZSTD_count(ip, match, vEnd);
+ if (match + matchLength != mEnd) return matchLength;
+ return matchLength + ZSTD_count(ip+matchLength, iStart, iEnd);
+}
+
+
+/*-*************************************
+* Hashes
+***************************************/
+static const U32 prime3bytes = 506832829U;
+static U32 ZSTD_hash3(U32 u, U32 h) { return ((u << (32-24)) * prime3bytes) >> (32-h) ; }
+MEM_STATIC size_t ZSTD_hash3Ptr(const void* ptr, U32 h) { return ZSTD_hash3(MEM_readLE32(ptr), h); } /* only in zstd_opt.h */
+
+static const U32 prime4bytes = 2654435761U;
+static U32 ZSTD_hash4(U32 u, U32 h) { return (u * prime4bytes) >> (32-h) ; }
+static size_t ZSTD_hash4Ptr(const void* ptr, U32 h) { return ZSTD_hash4(MEM_read32(ptr), h); }
+
+static const U64 prime5bytes = 889523592379ULL;
+static size_t ZSTD_hash5(U64 u, U32 h) { return (size_t)(((u << (64-40)) * prime5bytes) >> (64-h)) ; }
+static size_t ZSTD_hash5Ptr(const void* p, U32 h) { return ZSTD_hash5(MEM_readLE64(p), h); }
+
+static const U64 prime6bytes = 227718039650203ULL;
+static size_t ZSTD_hash6(U64 u, U32 h) { return (size_t)(((u << (64-48)) * prime6bytes) >> (64-h)) ; }
+static size_t ZSTD_hash6Ptr(const void* p, U32 h) { return ZSTD_hash6(MEM_readLE64(p), h); }
+
+static const U64 prime7bytes = 58295818150454627ULL;
+static size_t ZSTD_hash7(U64 u, U32 h) { return (size_t)(((u << (64-56)) * prime7bytes) >> (64-h)) ; }
+static size_t ZSTD_hash7Ptr(const void* p, U32 h) { return ZSTD_hash7(MEM_readLE64(p), h); }
+
+static const U64 prime8bytes = 0xCF1BBCDCB7A56463ULL;
+static size_t ZSTD_hash8(U64 u, U32 h) { return (size_t)(((u) * prime8bytes) >> (64-h)) ; }
+static size_t ZSTD_hash8Ptr(const void* p, U32 h) { return ZSTD_hash8(MEM_readLE64(p), h); }
+
+static size_t ZSTD_hashPtr(const void* p, U32 hBits, U32 mls)
+{
+ switch(mls)
+ {
+ default:
+ case 4: return ZSTD_hash4Ptr(p, hBits);
+ case 5: return ZSTD_hash5Ptr(p, hBits);
+ case 6: return ZSTD_hash6Ptr(p, hBits);
+ case 7: return ZSTD_hash7Ptr(p, hBits);
+ case 8: return ZSTD_hash8Ptr(p, hBits);
+ }
+}
+
+
+/*-*************************************
+* Fast Scan
+***************************************/
+static void ZSTD_fillHashTable (ZSTD_CCtx* zc, const void* end, const U32 mls)
+{
+ U32* const hashTable = zc->hashTable;
+ U32 const hBits = zc->params.cParams.hashLog;
+ const BYTE* const base = zc->base;
+ const BYTE* ip = base + zc->nextToUpdate;
+ const BYTE* const iend = ((const BYTE*)end) - HASH_READ_SIZE;
+ const size_t fastHashFillStep = 3;
+
+ while(ip <= iend) {
+ hashTable[ZSTD_hashPtr(ip, hBits, mls)] = (U32)(ip - base);
+ ip += fastHashFillStep;
+ }
+}
+
+
+FORCE_INLINE
+void ZSTD_compressBlock_fast_generic(ZSTD_CCtx* cctx,
+ const void* src, size_t srcSize,
+ const U32 mls)
+{
+ U32* const hashTable = cctx->hashTable;
+ U32 const hBits = cctx->params.cParams.hashLog;
+ seqStore_t* seqStorePtr = &(cctx->seqStore);
+ const BYTE* const base = cctx->base;
+ const BYTE* const istart = (const BYTE*)src;
+ const BYTE* ip = istart;
+ const BYTE* anchor = istart;
+ const U32 lowestIndex = cctx->dictLimit;
+ const BYTE* const lowest = base + lowestIndex;
+ const BYTE* const iend = istart + srcSize;
+ const BYTE* const ilimit = iend - HASH_READ_SIZE;
+ U32 offset_1=cctx->rep[0], offset_2=cctx->rep[1];
+ U32 offsetSaved = 0;
+
+ /* init */
+ ip += (ip==lowest);
+ { U32 const maxRep = (U32)(ip-lowest);
+ if (offset_2 > maxRep) offsetSaved = offset_2, offset_2 = 0;
+ if (offset_1 > maxRep) offsetSaved = offset_1, offset_1 = 0;
+ }
+
+ /* Main Search Loop */
+ while (ip < ilimit) { /* < instead of <=, because repcode check at (ip+1) */
+ size_t mLength;
+ size_t const h = ZSTD_hashPtr(ip, hBits, mls);
+ U32 const current = (U32)(ip-base);
+ U32 const matchIndex = hashTable[h];
+ const BYTE* match = base + matchIndex;
+ hashTable[h] = current; /* update hash table */
+
+ if ((offset_1 > 0) & (MEM_read32(ip+1-offset_1) == MEM_read32(ip+1))) {
+ mLength = ZSTD_count(ip+1+4, ip+1+4-offset_1, iend) + 4;
+ ip++;
+ ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, 0, mLength-MINMATCH);
+ } else {
+ U32 offset;
+ if ( (matchIndex <= lowestIndex) || (MEM_read32(match) != MEM_read32(ip)) ) {
+ ip += ((ip-anchor) >> g_searchStrength) + 1;
+ continue;
+ }
+ mLength = ZSTD_count(ip+4, match+4, iend) + 4;
+ offset = (U32)(ip-match);
+ while (((ip>anchor) & (match>lowest)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */
+ offset_2 = offset_1;
+ offset_1 = offset;
+
+ ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, offset + ZSTD_REP_MOVE, mLength-MINMATCH);
+ }
+
+ /* match found */
+ ip += mLength;
+ anchor = ip;
+
+ if (ip <= ilimit) {
+ /* Fill Table */
+ hashTable[ZSTD_hashPtr(base+current+2, hBits, mls)] = current+2; /* here because current+2 could be > iend-8 */
+ hashTable[ZSTD_hashPtr(ip-2, hBits, mls)] = (U32)(ip-2-base);
+ /* check immediate repcode */
+ while ( (ip <= ilimit)
+ && ( (offset_2>0)
+ & (MEM_read32(ip) == MEM_read32(ip - offset_2)) )) {
+ /* store sequence */
+ size_t const rLength = ZSTD_count(ip+4, ip+4-offset_2, iend) + 4;
+ { U32 const tmpOff = offset_2; offset_2 = offset_1; offset_1 = tmpOff; } /* swap offset_2 <=> offset_1 */
+ hashTable[ZSTD_hashPtr(ip, hBits, mls)] = (U32)(ip-base);
+ ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, rLength-MINMATCH);
+ ip += rLength;
+ anchor = ip;
+ continue; /* faster when present ... (?) */
+ } } }
+
+ /* save reps for next block */
+ cctx->savedRep[0] = offset_1 ? offset_1 : offsetSaved;
+ cctx->savedRep[1] = offset_2 ? offset_2 : offsetSaved;
+
+ /* Last Literals */
+ { size_t const lastLLSize = iend - anchor;
+ memcpy(seqStorePtr->lit, anchor, lastLLSize);
+ seqStorePtr->lit += lastLLSize;
+ }
+}
+
+
+static void ZSTD_compressBlock_fast(ZSTD_CCtx* ctx,
+ const void* src, size_t srcSize)
+{
+ const U32 mls = ctx->params.cParams.searchLength;
+ switch(mls)
+ {
+ default:
+ case 4 :
+ ZSTD_compressBlock_fast_generic(ctx, src, srcSize, 4); return;
+ case 5 :
+ ZSTD_compressBlock_fast_generic(ctx, src, srcSize, 5); return;
+ case 6 :
+ ZSTD_compressBlock_fast_generic(ctx, src, srcSize, 6); return;
+ case 7 :
+ ZSTD_compressBlock_fast_generic(ctx, src, srcSize, 7); return;
+ }
+}
+
+
+static void ZSTD_compressBlock_fast_extDict_generic(ZSTD_CCtx* ctx,
+ const void* src, size_t srcSize,
+ const U32 mls)
+{
+ U32* hashTable = ctx->hashTable;
+ const U32 hBits = ctx->params.cParams.hashLog;
+ seqStore_t* seqStorePtr = &(ctx->seqStore);
+ const BYTE* const base = ctx->base;
+ const BYTE* const dictBase = ctx->dictBase;
+ const BYTE* const istart = (const BYTE*)src;
+ const BYTE* ip = istart;
+ const BYTE* anchor = istart;
+ const U32 lowestIndex = ctx->lowLimit;
+ const BYTE* const dictStart = dictBase + lowestIndex;
+ const U32 dictLimit = ctx->dictLimit;
+ const BYTE* const lowPrefixPtr = base + dictLimit;
+ const BYTE* const dictEnd = dictBase + dictLimit;
+ const BYTE* const iend = istart + srcSize;
+ const BYTE* const ilimit = iend - 8;
+ U32 offset_1=ctx->rep[0], offset_2=ctx->rep[1];
+
+ /* Search Loop */
+ while (ip < ilimit) { /* < instead of <=, because (ip+1) */
+ const size_t h = ZSTD_hashPtr(ip, hBits, mls);
+ const U32 matchIndex = hashTable[h];
+ const BYTE* matchBase = matchIndex < dictLimit ? dictBase : base;
+ const BYTE* match = matchBase + matchIndex;
+ const U32 current = (U32)(ip-base);
+ const U32 repIndex = current + 1 - offset_1; /* offset_1 expected <= current +1 */
+ const BYTE* repBase = repIndex < dictLimit ? dictBase : base;
+ const BYTE* repMatch = repBase + repIndex;
+ size_t mLength;
+ hashTable[h] = current; /* update hash table */
+
+ if ( (((U32)((dictLimit-1) - repIndex) >= 3) /* intentional underflow */ & (repIndex > lowestIndex))
+ && (MEM_read32(repMatch) == MEM_read32(ip+1)) ) {
+ const BYTE* repMatchEnd = repIndex < dictLimit ? dictEnd : iend;
+ mLength = ZSTD_count_2segments(ip+1+EQUAL_READ32, repMatch+EQUAL_READ32, iend, repMatchEnd, lowPrefixPtr) + EQUAL_READ32;
+ ip++;
+ ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, 0, mLength-MINMATCH);
+ } else {
+ if ( (matchIndex < lowestIndex) ||
+ (MEM_read32(match) != MEM_read32(ip)) ) {
+ ip += ((ip-anchor) >> g_searchStrength) + 1;
+ continue;
+ }
+ { const BYTE* matchEnd = matchIndex < dictLimit ? dictEnd : iend;
+ const BYTE* lowMatchPtr = matchIndex < dictLimit ? dictStart : lowPrefixPtr;
+ U32 offset;
+ mLength = ZSTD_count_2segments(ip+EQUAL_READ32, match+EQUAL_READ32, iend, matchEnd, lowPrefixPtr) + EQUAL_READ32;
+ while (((ip>anchor) & (match>lowMatchPtr)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */
+ offset = current - matchIndex;
+ offset_2 = offset_1;
+ offset_1 = offset;
+ ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, offset + ZSTD_REP_MOVE, mLength-MINMATCH);
+ } }
+
+ /* found a match : store it */
+ ip += mLength;
+ anchor = ip;
+
+ if (ip <= ilimit) {
+ /* Fill Table */
+ hashTable[ZSTD_hashPtr(base+current+2, hBits, mls)] = current+2;
+ hashTable[ZSTD_hashPtr(ip-2, hBits, mls)] = (U32)(ip-2-base);
+ /* check immediate repcode */
+ while (ip <= ilimit) {
+ U32 const current2 = (U32)(ip-base);
+ U32 const repIndex2 = current2 - offset_2;
+ const BYTE* repMatch2 = repIndex2 < dictLimit ? dictBase + repIndex2 : base + repIndex2;
+ if ( (((U32)((dictLimit-1) - repIndex2) >= 3) & (repIndex2 > lowestIndex)) /* intentional overflow */
+ && (MEM_read32(repMatch2) == MEM_read32(ip)) ) {
+ const BYTE* const repEnd2 = repIndex2 < dictLimit ? dictEnd : iend;
+ size_t repLength2 = ZSTD_count_2segments(ip+EQUAL_READ32, repMatch2+EQUAL_READ32, iend, repEnd2, lowPrefixPtr) + EQUAL_READ32;
+ U32 tmpOffset = offset_2; offset_2 = offset_1; offset_1 = tmpOffset; /* swap offset_2 <=> offset_1 */
+ ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, repLength2-MINMATCH);
+ hashTable[ZSTD_hashPtr(ip, hBits, mls)] = current2;
+ ip += repLength2;
+ anchor = ip;
+ continue;
+ }
+ break;
+ } } }
+
+ /* save reps for next block */
+ ctx->savedRep[0] = offset_1; ctx->savedRep[1] = offset_2;
+
+ /* Last Literals */
+ { size_t const lastLLSize = iend - anchor;
+ memcpy(seqStorePtr->lit, anchor, lastLLSize);
+ seqStorePtr->lit += lastLLSize;
+ }
+}
+
+
+static void ZSTD_compressBlock_fast_extDict(ZSTD_CCtx* ctx,
+ const void* src, size_t srcSize)
+{
+ U32 const mls = ctx->params.cParams.searchLength;
+ switch(mls)
+ {
+ default:
+ case 4 :
+ ZSTD_compressBlock_fast_extDict_generic(ctx, src, srcSize, 4); return;
+ case 5 :
+ ZSTD_compressBlock_fast_extDict_generic(ctx, src, srcSize, 5); return;
+ case 6 :
+ ZSTD_compressBlock_fast_extDict_generic(ctx, src, srcSize, 6); return;
+ case 7 :
+ ZSTD_compressBlock_fast_extDict_generic(ctx, src, srcSize, 7); return;
+ }
+}
+
+
+/*-*************************************
+* Double Fast
+***************************************/
+static void ZSTD_fillDoubleHashTable (ZSTD_CCtx* cctx, const void* end, const U32 mls)
+{
+ U32* const hashLarge = cctx->hashTable;
+ U32 const hBitsL = cctx->params.cParams.hashLog;
+ U32* const hashSmall = cctx->chainTable;
+ U32 const hBitsS = cctx->params.cParams.chainLog;
+ const BYTE* const base = cctx->base;
+ const BYTE* ip = base + cctx->nextToUpdate;
+ const BYTE* const iend = ((const BYTE*)end) - HASH_READ_SIZE;
+ const size_t fastHashFillStep = 3;
+
+ while(ip <= iend) {
+ hashSmall[ZSTD_hashPtr(ip, hBitsS, mls)] = (U32)(ip - base);
+ hashLarge[ZSTD_hashPtr(ip, hBitsL, 8)] = (U32)(ip - base);
+ ip += fastHashFillStep;
+ }
+}
+
+
+FORCE_INLINE
+void ZSTD_compressBlock_doubleFast_generic(ZSTD_CCtx* cctx,
+ const void* src, size_t srcSize,
+ const U32 mls)
+{
+ U32* const hashLong = cctx->hashTable;
+ const U32 hBitsL = cctx->params.cParams.hashLog;
+ U32* const hashSmall = cctx->chainTable;
+ const U32 hBitsS = cctx->params.cParams.chainLog;
+ seqStore_t* seqStorePtr = &(cctx->seqStore);
+ const BYTE* const base = cctx->base;
+ const BYTE* const istart = (const BYTE*)src;
+ const BYTE* ip = istart;
+ const BYTE* anchor = istart;
+ const U32 lowestIndex = cctx->dictLimit;
+ const BYTE* const lowest = base + lowestIndex;
+ const BYTE* const iend = istart + srcSize;
+ const BYTE* const ilimit = iend - HASH_READ_SIZE;
+ U32 offset_1=cctx->rep[0], offset_2=cctx->rep[1];
+ U32 offsetSaved = 0;
+
+ /* init */
+ ip += (ip==lowest);
+ { U32 const maxRep = (U32)(ip-lowest);
+ if (offset_2 > maxRep) offsetSaved = offset_2, offset_2 = 0;
+ if (offset_1 > maxRep) offsetSaved = offset_1, offset_1 = 0;
+ }
+
+ /* Main Search Loop */
+ while (ip < ilimit) { /* < instead of <=, because repcode check at (ip+1) */
+ size_t mLength;
+ size_t const h2 = ZSTD_hashPtr(ip, hBitsL, 8);
+ size_t const h = ZSTD_hashPtr(ip, hBitsS, mls);
+ U32 const current = (U32)(ip-base);
+ U32 const matchIndexL = hashLong[h2];
+ U32 const matchIndexS = hashSmall[h];
+ const BYTE* matchLong = base + matchIndexL;
+ const BYTE* match = base + matchIndexS;
+ hashLong[h2] = hashSmall[h] = current; /* update hash tables */
+
+ if ((offset_1 > 0) & (MEM_read32(ip+1-offset_1) == MEM_read32(ip+1))) { /* note : by construction, offset_1 <= current */
+ mLength = ZSTD_count(ip+1+4, ip+1+4-offset_1, iend) + 4;
+ ip++;
+ ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, 0, mLength-MINMATCH);
+ } else {
+ U32 offset;
+ if ( (matchIndexL > lowestIndex) && (MEM_read64(matchLong) == MEM_read64(ip)) ) {
+ mLength = ZSTD_count(ip+8, matchLong+8, iend) + 8;
+ offset = (U32)(ip-matchLong);
+ while (((ip>anchor) & (matchLong>lowest)) && (ip[-1] == matchLong[-1])) { ip--; matchLong--; mLength++; } /* catch up */
+ } else if ( (matchIndexS > lowestIndex) && (MEM_read32(match) == MEM_read32(ip)) ) {
+ size_t const h3 = ZSTD_hashPtr(ip+1, hBitsL, 8);
+ U32 const matchIndex3 = hashLong[h3];
+ const BYTE* match3 = base + matchIndex3;
+ hashLong[h3] = current + 1;
+ if ( (matchIndex3 > lowestIndex) && (MEM_read64(match3) == MEM_read64(ip+1)) ) {
+ mLength = ZSTD_count(ip+9, match3+8, iend) + 8;
+ ip++;
+ offset = (U32)(ip-match3);
+ while (((ip>anchor) & (match3>lowest)) && (ip[-1] == match3[-1])) { ip--; match3--; mLength++; } /* catch up */
+ } else {
+ mLength = ZSTD_count(ip+4, match+4, iend) + 4;
+ offset = (U32)(ip-match);
+ while (((ip>anchor) & (match>lowest)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */
+ }
+ } else {
+ ip += ((ip-anchor) >> g_searchStrength) + 1;
+ continue;
+ }
+
+ offset_2 = offset_1;
+ offset_1 = offset;
+
+ ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, offset + ZSTD_REP_MOVE, mLength-MINMATCH);
+ }
+
+ /* match found */
+ ip += mLength;
+ anchor = ip;
+
+ if (ip <= ilimit) {
+ /* Fill Table */
+ hashLong[ZSTD_hashPtr(base+current+2, hBitsL, 8)] =
+ hashSmall[ZSTD_hashPtr(base+current+2, hBitsS, mls)] = current+2; /* here because current+2 could be > iend-8 */
+ hashLong[ZSTD_hashPtr(ip-2, hBitsL, 8)] =
+ hashSmall[ZSTD_hashPtr(ip-2, hBitsS, mls)] = (U32)(ip-2-base);
+
+ /* check immediate repcode */
+ while ( (ip <= ilimit)
+ && ( (offset_2>0)
+ & (MEM_read32(ip) == MEM_read32(ip - offset_2)) )) {
+ /* store sequence */
+ size_t const rLength = ZSTD_count(ip+4, ip+4-offset_2, iend) + 4;
+ { U32 const tmpOff = offset_2; offset_2 = offset_1; offset_1 = tmpOff; } /* swap offset_2 <=> offset_1 */
+ hashSmall[ZSTD_hashPtr(ip, hBitsS, mls)] = (U32)(ip-base);
+ hashLong[ZSTD_hashPtr(ip, hBitsL, 8)] = (U32)(ip-base);
+ ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, rLength-MINMATCH);
+ ip += rLength;
+ anchor = ip;
+ continue; /* faster when present ... (?) */
+ } } }
+
+ /* save reps for next block */
+ cctx->savedRep[0] = offset_1 ? offset_1 : offsetSaved;
+ cctx->savedRep[1] = offset_2 ? offset_2 : offsetSaved;
+
+ /* Last Literals */
+ { size_t const lastLLSize = iend - anchor;
+ memcpy(seqStorePtr->lit, anchor, lastLLSize);
+ seqStorePtr->lit += lastLLSize;
+ }
+}
+
+
+static void ZSTD_compressBlock_doubleFast(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
+{
+ const U32 mls = ctx->params.cParams.searchLength;
+ switch(mls)
+ {
+ default:
+ case 4 :
+ ZSTD_compressBlock_doubleFast_generic(ctx, src, srcSize, 4); return;
+ case 5 :
+ ZSTD_compressBlock_doubleFast_generic(ctx, src, srcSize, 5); return;
+ case 6 :
+ ZSTD_compressBlock_doubleFast_generic(ctx, src, srcSize, 6); return;
+ case 7 :
+ ZSTD_compressBlock_doubleFast_generic(ctx, src, srcSize, 7); return;
+ }
+}
+
+
+static void ZSTD_compressBlock_doubleFast_extDict_generic(ZSTD_CCtx* ctx,
+ const void* src, size_t srcSize,
+ const U32 mls)
+{
+ U32* const hashLong = ctx->hashTable;
+ U32 const hBitsL = ctx->params.cParams.hashLog;
+ U32* const hashSmall = ctx->chainTable;
+ U32 const hBitsS = ctx->params.cParams.chainLog;
+ seqStore_t* seqStorePtr = &(ctx->seqStore);
+ const BYTE* const base = ctx->base;
+ const BYTE* const dictBase = ctx->dictBase;
+ const BYTE* const istart = (const BYTE*)src;
+ const BYTE* ip = istart;
+ const BYTE* anchor = istart;
+ const U32 lowestIndex = ctx->lowLimit;
+ const BYTE* const dictStart = dictBase + lowestIndex;
+ const U32 dictLimit = ctx->dictLimit;
+ const BYTE* const lowPrefixPtr = base + dictLimit;
+ const BYTE* const dictEnd = dictBase + dictLimit;
+ const BYTE* const iend = istart + srcSize;
+ const BYTE* const ilimit = iend - 8;
+ U32 offset_1=ctx->rep[0], offset_2=ctx->rep[1];
+
+ /* Search Loop */
+ while (ip < ilimit) { /* < instead of <=, because (ip+1) */
+ const size_t hSmall = ZSTD_hashPtr(ip, hBitsS, mls);
+ const U32 matchIndex = hashSmall[hSmall];
+ const BYTE* matchBase = matchIndex < dictLimit ? dictBase : base;
+ const BYTE* match = matchBase + matchIndex;
+
+ const size_t hLong = ZSTD_hashPtr(ip, hBitsL, 8);
+ const U32 matchLongIndex = hashLong[hLong];
+ const BYTE* matchLongBase = matchLongIndex < dictLimit ? dictBase : base;
+ const BYTE* matchLong = matchLongBase + matchLongIndex;
+
+ const U32 current = (U32)(ip-base);
+ const U32 repIndex = current + 1 - offset_1; /* offset_1 expected <= current +1 */
+ const BYTE* repBase = repIndex < dictLimit ? dictBase : base;
+ const BYTE* repMatch = repBase + repIndex;
+ size_t mLength;
+ hashSmall[hSmall] = hashLong[hLong] = current; /* update hash table */
+
+ if ( (((U32)((dictLimit-1) - repIndex) >= 3) /* intentional underflow */ & (repIndex > lowestIndex))
+ && (MEM_read32(repMatch) == MEM_read32(ip+1)) ) {
+ const BYTE* repMatchEnd = repIndex < dictLimit ? dictEnd : iend;
+ mLength = ZSTD_count_2segments(ip+1+4, repMatch+4, iend, repMatchEnd, lowPrefixPtr) + 4;
+ ip++;
+ ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, 0, mLength-MINMATCH);
+ } else {
+ if ((matchLongIndex > lowestIndex) && (MEM_read64(matchLong) == MEM_read64(ip))) {
+ const BYTE* matchEnd = matchLongIndex < dictLimit ? dictEnd : iend;
+ const BYTE* lowMatchPtr = matchLongIndex < dictLimit ? dictStart : lowPrefixPtr;
+ U32 offset;
+ mLength = ZSTD_count_2segments(ip+8, matchLong+8, iend, matchEnd, lowPrefixPtr) + 8;
+ offset = current - matchLongIndex;
+ while (((ip>anchor) & (matchLong>lowMatchPtr)) && (ip[-1] == matchLong[-1])) { ip--; matchLong--; mLength++; } /* catch up */
+ offset_2 = offset_1;
+ offset_1 = offset;
+ ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, offset + ZSTD_REP_MOVE, mLength-MINMATCH);
+
+ } else if ((matchIndex > lowestIndex) && (MEM_read32(match) == MEM_read32(ip))) {
+ size_t const h3 = ZSTD_hashPtr(ip+1, hBitsL, 8);
+ U32 const matchIndex3 = hashLong[h3];
+ const BYTE* const match3Base = matchIndex3 < dictLimit ? dictBase : base;
+ const BYTE* match3 = match3Base + matchIndex3;
+ U32 offset;
+ hashLong[h3] = current + 1;
+ if ( (matchIndex3 > lowestIndex) && (MEM_read64(match3) == MEM_read64(ip+1)) ) {
+ const BYTE* matchEnd = matchIndex3 < dictLimit ? dictEnd : iend;
+ const BYTE* lowMatchPtr = matchIndex3 < dictLimit ? dictStart : lowPrefixPtr;
+ mLength = ZSTD_count_2segments(ip+9, match3+8, iend, matchEnd, lowPrefixPtr) + 8;
+ ip++;
+ offset = current+1 - matchIndex3;
+ while (((ip>anchor) & (match3>lowMatchPtr)) && (ip[-1] == match3[-1])) { ip--; match3--; mLength++; } /* catch up */
+ } else {
+ const BYTE* matchEnd = matchIndex < dictLimit ? dictEnd : iend;
+ const BYTE* lowMatchPtr = matchIndex < dictLimit ? dictStart : lowPrefixPtr;
+ mLength = ZSTD_count_2segments(ip+4, match+4, iend, matchEnd, lowPrefixPtr) + 4;
+ offset = current - matchIndex;
+ while (((ip>anchor) & (match>lowMatchPtr)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */
+ }
+ offset_2 = offset_1;
+ offset_1 = offset;
+ ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, offset + ZSTD_REP_MOVE, mLength-MINMATCH);
+
+ } else {
+ ip += ((ip-anchor) >> g_searchStrength) + 1;
+ continue;
+ } }
+
+ /* found a match : store it */
+ ip += mLength;
+ anchor = ip;
+
+ if (ip <= ilimit) {
+ /* Fill Table */
+ hashSmall[ZSTD_hashPtr(base+current+2, hBitsS, mls)] = current+2;
+ hashLong[ZSTD_hashPtr(base+current+2, hBitsL, 8)] = current+2;
+ hashSmall[ZSTD_hashPtr(ip-2, hBitsS, mls)] = (U32)(ip-2-base);
+ hashLong[ZSTD_hashPtr(ip-2, hBitsL, 8)] = (U32)(ip-2-base);
+ /* check immediate repcode */
+ while (ip <= ilimit) {
+ U32 const current2 = (U32)(ip-base);
+ U32 const repIndex2 = current2 - offset_2;
+ const BYTE* repMatch2 = repIndex2 < dictLimit ? dictBase + repIndex2 : base + repIndex2;
+ if ( (((U32)((dictLimit-1) - repIndex2) >= 3) & (repIndex2 > lowestIndex)) /* intentional overflow */
+ && (MEM_read32(repMatch2) == MEM_read32(ip)) ) {
+ const BYTE* const repEnd2 = repIndex2 < dictLimit ? dictEnd : iend;
+ size_t const repLength2 = ZSTD_count_2segments(ip+EQUAL_READ32, repMatch2+EQUAL_READ32, iend, repEnd2, lowPrefixPtr) + EQUAL_READ32;
+ U32 tmpOffset = offset_2; offset_2 = offset_1; offset_1 = tmpOffset; /* swap offset_2 <=> offset_1 */
+ ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, repLength2-MINMATCH);
+ hashSmall[ZSTD_hashPtr(ip, hBitsS, mls)] = current2;
+ hashLong[ZSTD_hashPtr(ip, hBitsL, 8)] = current2;
+ ip += repLength2;
+ anchor = ip;
+ continue;
+ }
+ break;
+ } } }
+
+ /* save reps for next block */
+ ctx->savedRep[0] = offset_1; ctx->savedRep[1] = offset_2;
+
+ /* Last Literals */
+ { size_t const lastLLSize = iend - anchor;
+ memcpy(seqStorePtr->lit, anchor, lastLLSize);
+ seqStorePtr->lit += lastLLSize;
+ }
+}
+
+
+static void ZSTD_compressBlock_doubleFast_extDict(ZSTD_CCtx* ctx,
+ const void* src, size_t srcSize)
+{
+ U32 const mls = ctx->params.cParams.searchLength;
+ switch(mls)
+ {
+ default:
+ case 4 :
+ ZSTD_compressBlock_doubleFast_extDict_generic(ctx, src, srcSize, 4); return;
+ case 5 :
+ ZSTD_compressBlock_doubleFast_extDict_generic(ctx, src, srcSize, 5); return;
+ case 6 :
+ ZSTD_compressBlock_doubleFast_extDict_generic(ctx, src, srcSize, 6); return;
+ case 7 :
+ ZSTD_compressBlock_doubleFast_extDict_generic(ctx, src, srcSize, 7); return;
+ }
+}
+
+
+/*-*************************************
+* Binary Tree search
+***************************************/
+/** ZSTD_insertBt1() : add one or multiple positions to tree.
+* ip : assumed <= iend-8 .
+* @return : nb of positions added */
+static U32 ZSTD_insertBt1(ZSTD_CCtx* zc, const BYTE* const ip, const U32 mls, const BYTE* const iend, U32 nbCompares,
+ U32 extDict)
+{
+ U32* const hashTable = zc->hashTable;
+ U32 const hashLog = zc->params.cParams.hashLog;
+ size_t const h = ZSTD_hashPtr(ip, hashLog, mls);
+ U32* const bt = zc->chainTable;
+ U32 const btLog = zc->params.cParams.chainLog - 1;
+ U32 const btMask = (1 << btLog) - 1;
+ U32 matchIndex = hashTable[h];
+ size_t commonLengthSmaller=0, commonLengthLarger=0;
+ const BYTE* const base = zc->base;
+ const BYTE* const dictBase = zc->dictBase;
+ const U32 dictLimit = zc->dictLimit;
+ const BYTE* const dictEnd = dictBase + dictLimit;
+ const BYTE* const prefixStart = base + dictLimit;
+ const BYTE* match;
+ const U32 current = (U32)(ip-base);
+ const U32 btLow = btMask >= current ? 0 : current - btMask;
+ U32* smallerPtr = bt + 2*(current&btMask);
+ U32* largerPtr = smallerPtr + 1;
+ U32 dummy32; /* to be nullified at the end */
+ U32 const windowLow = zc->lowLimit;
+ U32 matchEndIdx = current+8;
+ size_t bestLength = 8;
+#ifdef ZSTD_C_PREDICT
+ U32 predictedSmall = *(bt + 2*((current-1)&btMask) + 0);
+ U32 predictedLarge = *(bt + 2*((current-1)&btMask) + 1);
+ predictedSmall += (predictedSmall>0);
+ predictedLarge += (predictedLarge>0);
+#endif /* ZSTD_C_PREDICT */
+
+ hashTable[h] = current; /* Update Hash Table */
+
+ while (nbCompares-- && (matchIndex > windowLow)) {
+ U32* nextPtr = bt + 2*(matchIndex & btMask);
+ size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger); /* guaranteed minimum nb of common bytes */
+#ifdef ZSTD_C_PREDICT /* note : can create issues when hlog small <= 11 */
+ const U32* predictPtr = bt + 2*((matchIndex-1) & btMask); /* written this way, as bt is a roll buffer */
+ if (matchIndex == predictedSmall) {
+ /* no need to check length, result known */
+ *smallerPtr = matchIndex;
+ if (matchIndex <= btLow) { smallerPtr=&dummy32; break; } /* beyond tree size, stop the search */
+ smallerPtr = nextPtr+1; /* new "smaller" => larger of match */
+ matchIndex = nextPtr[1]; /* new matchIndex larger than previous (closer to current) */
+ predictedSmall = predictPtr[1] + (predictPtr[1]>0);
+ continue;
+ }
+ if (matchIndex == predictedLarge) {
+ *largerPtr = matchIndex;
+ if (matchIndex <= btLow) { largerPtr=&dummy32; break; } /* beyond tree size, stop the search */
+ largerPtr = nextPtr;
+ matchIndex = nextPtr[0];
+ predictedLarge = predictPtr[0] + (predictPtr[0]>0);
+ continue;
+ }
+#endif
+ if ((!extDict) || (matchIndex+matchLength >= dictLimit)) {
+ match = base + matchIndex;
+ if (match[matchLength] == ip[matchLength])
+ matchLength += ZSTD_count(ip+matchLength+1, match+matchLength+1, iend) +1;
+ } else {
+ match = dictBase + matchIndex;
+ matchLength += ZSTD_count_2segments(ip+matchLength, match+matchLength, iend, dictEnd, prefixStart);
+ if (matchIndex+matchLength >= dictLimit)
+ match = base + matchIndex; /* to prepare for next usage of match[matchLength] */
+ }
+
+ if (matchLength > bestLength) {
+ bestLength = matchLength;
+ if (matchLength > matchEndIdx - matchIndex)
+ matchEndIdx = matchIndex + (U32)matchLength;
+ }
+
+ if (ip+matchLength == iend) /* equal : no way to know if inf or sup */
+ break; /* drop , to guarantee consistency ; miss a bit of compression, but other solutions can corrupt the tree */
+
+ if (match[matchLength] < ip[matchLength]) { /* necessarily within correct buffer */
+ /* match is smaller than current */
+ *smallerPtr = matchIndex; /* update smaller idx */
+ commonLengthSmaller = matchLength; /* all smaller will now have at least this guaranteed common length */
+ if (matchIndex <= btLow) { smallerPtr=&dummy32; break; } /* beyond tree size, stop the search */
+ smallerPtr = nextPtr+1; /* new "smaller" => larger of match */
+ matchIndex = nextPtr[1]; /* new matchIndex larger than previous (closer to current) */
+ } else {
+ /* match is larger than current */
+ *largerPtr = matchIndex;
+ commonLengthLarger = matchLength;
+ if (matchIndex <= btLow) { largerPtr=&dummy32; break; } /* beyond tree size, stop the search */
+ largerPtr = nextPtr;
+ matchIndex = nextPtr[0];
+ } }
+
+ *smallerPtr = *largerPtr = 0;
+ if (bestLength > 384) return MIN(192, (U32)(bestLength - 384)); /* speed optimization */
+ if (matchEndIdx > current + 8) return matchEndIdx - current - 8;
+ return 1;
+}
+
+
+static size_t ZSTD_insertBtAndFindBestMatch (
+ ZSTD_CCtx* zc,
+ const BYTE* const ip, const BYTE* const iend,
+ size_t* offsetPtr,
+ U32 nbCompares, const U32 mls,
+ U32 extDict)
+{
+ U32* const hashTable = zc->hashTable;
+ U32 const hashLog = zc->params.cParams.hashLog;
+ size_t const h = ZSTD_hashPtr(ip, hashLog, mls);
+ U32* const bt = zc->chainTable;
+ U32 const btLog = zc->params.cParams.chainLog - 1;
+ U32 const btMask = (1 << btLog) - 1;
+ U32 matchIndex = hashTable[h];
+ size_t commonLengthSmaller=0, commonLengthLarger=0;
+ const BYTE* const base = zc->base;
+ const BYTE* const dictBase = zc->dictBase;
+ const U32 dictLimit = zc->dictLimit;
+ const BYTE* const dictEnd = dictBase + dictLimit;
+ const BYTE* const prefixStart = base + dictLimit;
+ const U32 current = (U32)(ip-base);
+ const U32 btLow = btMask >= current ? 0 : current - btMask;
+ const U32 windowLow = zc->lowLimit;
+ U32* smallerPtr = bt + 2*(current&btMask);
+ U32* largerPtr = bt + 2*(current&btMask) + 1;
+ U32 matchEndIdx = current+8;
+ U32 dummy32; /* to be nullified at the end */
+ size_t bestLength = 0;
+
+ hashTable[h] = current; /* Update Hash Table */
+
+ while (nbCompares-- && (matchIndex > windowLow)) {
+ U32* nextPtr = bt + 2*(matchIndex & btMask);
+ size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger); /* guaranteed minimum nb of common bytes */
+ const BYTE* match;
+
+ if ((!extDict) || (matchIndex+matchLength >= dictLimit)) {
+ match = base + matchIndex;
+ if (match[matchLength] == ip[matchLength])
+ matchLength += ZSTD_count(ip+matchLength+1, match+matchLength+1, iend) +1;
+ } else {
+ match = dictBase + matchIndex;
+ matchLength += ZSTD_count_2segments(ip+matchLength, match+matchLength, iend, dictEnd, prefixStart);
+ if (matchIndex+matchLength >= dictLimit)
+ match = base + matchIndex; /* to prepare for next usage of match[matchLength] */
+ }
+
+ if (matchLength > bestLength) {
+ if (matchLength > matchEndIdx - matchIndex)
+ matchEndIdx = matchIndex + (U32)matchLength;
+ if ( (4*(int)(matchLength-bestLength)) > (int)(ZSTD_highbit32(current-matchIndex+1) - ZSTD_highbit32((U32)offsetPtr[0]+1)) )
+ bestLength = matchLength, *offsetPtr = ZSTD_REP_MOVE + current - matchIndex;
+ if (ip+matchLength == iend) /* equal : no way to know if inf or sup */
+ break; /* drop, to guarantee consistency (miss a little bit of compression) */
+ }
+
+ if (match[matchLength] < ip[matchLength]) {
+ /* match is smaller than current */
+ *smallerPtr = matchIndex; /* update smaller idx */
+ commonLengthSmaller = matchLength; /* all smaller will now have at least this guaranteed common length */
+ if (matchIndex <= btLow) { smallerPtr=&dummy32; break; } /* beyond tree size, stop the search */
+ smallerPtr = nextPtr+1; /* new "smaller" => larger of match */
+ matchIndex = nextPtr[1]; /* new matchIndex larger than previous (closer to current) */
+ } else {
+ /* match is larger than current */
+ *largerPtr = matchIndex;
+ commonLengthLarger = matchLength;
+ if (matchIndex <= btLow) { largerPtr=&dummy32; break; } /* beyond tree size, stop the search */
+ largerPtr = nextPtr;
+ matchIndex = nextPtr[0];
+ } }
+
+ *smallerPtr = *largerPtr = 0;
+
+ zc->nextToUpdate = (matchEndIdx > current + 8) ? matchEndIdx - 8 : current+1;
+ return bestLength;
+}
+
+
+static void ZSTD_updateTree(ZSTD_CCtx* zc, const BYTE* const ip, const BYTE* const iend, const U32 nbCompares, const U32 mls)
+{
+ const BYTE* const base = zc->base;
+ const U32 target = (U32)(ip - base);
+ U32 idx = zc->nextToUpdate;
+
+ while(idx < target)
+ idx += ZSTD_insertBt1(zc, base+idx, mls, iend, nbCompares, 0);
+}
+
+/** ZSTD_BtFindBestMatch() : Tree updater, providing best match */
+static size_t ZSTD_BtFindBestMatch (
+ ZSTD_CCtx* zc,
+ const BYTE* const ip, const BYTE* const iLimit,
+ size_t* offsetPtr,
+ const U32 maxNbAttempts, const U32 mls)
+{
+ if (ip < zc->base + zc->nextToUpdate) return 0; /* skipped area */
+ ZSTD_updateTree(zc, ip, iLimit, maxNbAttempts, mls);
+ return ZSTD_insertBtAndFindBestMatch(zc, ip, iLimit, offsetPtr, maxNbAttempts, mls, 0);
+}
+
+
+static size_t ZSTD_BtFindBestMatch_selectMLS (
+ ZSTD_CCtx* zc, /* Index table will be updated */
+ const BYTE* ip, const BYTE* const iLimit,
+ size_t* offsetPtr,
+ const U32 maxNbAttempts, const U32 matchLengthSearch)
+{
+ switch(matchLengthSearch)
+ {
+ default :
+ case 4 : return ZSTD_BtFindBestMatch(zc, ip, iLimit, offsetPtr, maxNbAttempts, 4);
+ case 5 : return ZSTD_BtFindBestMatch(zc, ip, iLimit, offsetPtr, maxNbAttempts, 5);
+ case 6 : return ZSTD_BtFindBestMatch(zc, ip, iLimit, offsetPtr, maxNbAttempts, 6);
+ }
+}
+
+
+static void ZSTD_updateTree_extDict(ZSTD_CCtx* zc, const BYTE* const ip, const BYTE* const iend, const U32 nbCompares, const U32 mls)
+{
+ const BYTE* const base = zc->base;
+ const U32 target = (U32)(ip - base);
+ U32 idx = zc->nextToUpdate;
+
+ while (idx < target) idx += ZSTD_insertBt1(zc, base+idx, mls, iend, nbCompares, 1);
+}
+
+
+/** Tree updater, providing best match */
+static size_t ZSTD_BtFindBestMatch_extDict (
+ ZSTD_CCtx* zc,
+ const BYTE* const ip, const BYTE* const iLimit,
+ size_t* offsetPtr,
+ const U32 maxNbAttempts, const U32 mls)
+{
+ if (ip < zc->base + zc->nextToUpdate) return 0; /* skipped area */
+ ZSTD_updateTree_extDict(zc, ip, iLimit, maxNbAttempts, mls);
+ return ZSTD_insertBtAndFindBestMatch(zc, ip, iLimit, offsetPtr, maxNbAttempts, mls, 1);
+}
+
+
+static size_t ZSTD_BtFindBestMatch_selectMLS_extDict (
+ ZSTD_CCtx* zc, /* Index table will be updated */
+ const BYTE* ip, const BYTE* const iLimit,
+ size_t* offsetPtr,
+ const U32 maxNbAttempts, const U32 matchLengthSearch)
+{
+ switch(matchLengthSearch)
+ {
+ default :
+ case 4 : return ZSTD_BtFindBestMatch_extDict(zc, ip, iLimit, offsetPtr, maxNbAttempts, 4);
+ case 5 : return ZSTD_BtFindBestMatch_extDict(zc, ip, iLimit, offsetPtr, maxNbAttempts, 5);
+ case 6 : return ZSTD_BtFindBestMatch_extDict(zc, ip, iLimit, offsetPtr, maxNbAttempts, 6);
+ }
+}
+
+
+
+/* *********************************
+* Hash Chain
+***********************************/
+#define NEXT_IN_CHAIN(d, mask) chainTable[(d) & mask]
+
+/* Update chains up to ip (excluded)
+ Assumption : always within prefix (ie. not within extDict) */
+FORCE_INLINE
+U32 ZSTD_insertAndFindFirstIndex (ZSTD_CCtx* zc, const BYTE* ip, U32 mls)
+{
+ U32* const hashTable = zc->hashTable;
+ const U32 hashLog = zc->params.cParams.hashLog;
+ U32* const chainTable = zc->chainTable;
+ const U32 chainMask = (1 << zc->params.cParams.chainLog) - 1;
+ const BYTE* const base = zc->base;
+ const U32 target = (U32)(ip - base);
+ U32 idx = zc->nextToUpdate;
+
+ while(idx < target) { /* catch up */
+ size_t const h = ZSTD_hashPtr(base+idx, hashLog, mls);
+ NEXT_IN_CHAIN(idx, chainMask) = hashTable[h];
+ hashTable[h] = idx;
+ idx++;
+ }
+
+ zc->nextToUpdate = target;
+ return hashTable[ZSTD_hashPtr(ip, hashLog, mls)];
+}
+
+
+
+FORCE_INLINE /* inlining is important to hardwire a hot branch (template emulation) */
+size_t ZSTD_HcFindBestMatch_generic (
+ ZSTD_CCtx* zc, /* Index table will be updated */
+ const BYTE* const ip, const BYTE* const iLimit,
+ size_t* offsetPtr,
+ const U32 maxNbAttempts, const U32 mls, const U32 extDict)
+{
+ U32* const chainTable = zc->chainTable;
+ const U32 chainSize = (1 << zc->params.cParams.chainLog);
+ const U32 chainMask = chainSize-1;
+ const BYTE* const base = zc->base;
+ const BYTE* const dictBase = zc->dictBase;
+ const U32 dictLimit = zc->dictLimit;
+ const BYTE* const prefixStart = base + dictLimit;
+ const BYTE* const dictEnd = dictBase + dictLimit;
+ const U32 lowLimit = zc->lowLimit;
+ const U32 current = (U32)(ip-base);
+ const U32 minChain = current > chainSize ? current - chainSize : 0;
+ int nbAttempts=maxNbAttempts;
+ size_t ml=EQUAL_READ32-1;
+
+ /* HC4 match finder */
+ U32 matchIndex = ZSTD_insertAndFindFirstIndex (zc, ip, mls);
+
+ for ( ; (matchIndex>lowLimit) & (nbAttempts>0) ; nbAttempts--) {
+ const BYTE* match;
+ size_t currentMl=0;
+ if ((!extDict) || matchIndex >= dictLimit) {
+ match = base + matchIndex;
+ if (match[ml] == ip[ml]) /* potentially better */
+ currentMl = ZSTD_count(ip, match, iLimit);
+ } else {
+ match = dictBase + matchIndex;
+ if (MEM_read32(match) == MEM_read32(ip)) /* assumption : matchIndex <= dictLimit-4 (by table construction) */
+ currentMl = ZSTD_count_2segments(ip+EQUAL_READ32, match+EQUAL_READ32, iLimit, dictEnd, prefixStart) + EQUAL_READ32;
+ }
+
+ /* save best solution */
+ if (currentMl > ml) { ml = currentMl; *offsetPtr = current - matchIndex + ZSTD_REP_MOVE; if (ip+currentMl == iLimit) break; /* best possible, and avoid read overflow*/ }
+
+ if (matchIndex <= minChain) break;
+ matchIndex = NEXT_IN_CHAIN(matchIndex, chainMask);
+ }
+
+ return ml;
+}
+
+
+FORCE_INLINE size_t ZSTD_HcFindBestMatch_selectMLS (
+ ZSTD_CCtx* zc,
+ const BYTE* ip, const BYTE* const iLimit,
+ size_t* offsetPtr,
+ const U32 maxNbAttempts, const U32 matchLengthSearch)
+{
+ switch(matchLengthSearch)
+ {
+ default :
+ case 4 : return ZSTD_HcFindBestMatch_generic(zc, ip, iLimit, offsetPtr, maxNbAttempts, 4, 0);
+ case 5 : return ZSTD_HcFindBestMatch_generic(zc, ip, iLimit, offsetPtr, maxNbAttempts, 5, 0);
+ case 6 : return ZSTD_HcFindBestMatch_generic(zc, ip, iLimit, offsetPtr, maxNbAttempts, 6, 0);
+ }
+}
+
+
+FORCE_INLINE size_t ZSTD_HcFindBestMatch_extDict_selectMLS (
+ ZSTD_CCtx* zc,
+ const BYTE* ip, const BYTE* const iLimit,
+ size_t* offsetPtr,
+ const U32 maxNbAttempts, const U32 matchLengthSearch)
+{
+ switch(matchLengthSearch)
+ {
+ default :
+ case 4 : return ZSTD_HcFindBestMatch_generic(zc, ip, iLimit, offsetPtr, maxNbAttempts, 4, 1);
+ case 5 : return ZSTD_HcFindBestMatch_generic(zc, ip, iLimit, offsetPtr, maxNbAttempts, 5, 1);
+ case 6 : return ZSTD_HcFindBestMatch_generic(zc, ip, iLimit, offsetPtr, maxNbAttempts, 6, 1);
+ }
+}
+
+
+/* *******************************
+* Common parser - lazy strategy
+*********************************/
+FORCE_INLINE
+void ZSTD_compressBlock_lazy_generic(ZSTD_CCtx* ctx,
+ const void* src, size_t srcSize,
+ const U32 searchMethod, const U32 depth)
+{
+ seqStore_t* seqStorePtr = &(ctx->seqStore);
+ const BYTE* const istart = (const BYTE*)src;
+ const BYTE* ip = istart;
+ const BYTE* anchor = istart;
+ const BYTE* const iend = istart + srcSize;
+ const BYTE* const ilimit = iend - 8;
+ const BYTE* const base = ctx->base + ctx->dictLimit;
+
+ U32 const maxSearches = 1 << ctx->params.cParams.searchLog;
+ U32 const mls = ctx->params.cParams.searchLength;
+
+ typedef size_t (*searchMax_f)(ZSTD_CCtx* zc, const BYTE* ip, const BYTE* iLimit,
+ size_t* offsetPtr,
+ U32 maxNbAttempts, U32 matchLengthSearch);
+ searchMax_f const searchMax = searchMethod ? ZSTD_BtFindBestMatch_selectMLS : ZSTD_HcFindBestMatch_selectMLS;
+ U32 offset_1 = ctx->rep[0], offset_2 = ctx->rep[1], savedOffset=0;
+
+ /* init */
+ ip += (ip==base);
+ ctx->nextToUpdate3 = ctx->nextToUpdate;
+ { U32 const maxRep = (U32)(ip-base);
+ if (offset_2 > maxRep) savedOffset = offset_2, offset_2 = 0;
+ if (offset_1 > maxRep) savedOffset = offset_1, offset_1 = 0;
+ }
+
+ /* Match Loop */
+ while (ip < ilimit) {
+ size_t matchLength=0;
+ size_t offset=0;
+ const BYTE* start=ip+1;
+
+ /* check repCode */
+ if ((offset_1>0) & (MEM_read32(ip+1) == MEM_read32(ip+1 - offset_1))) {
+ /* repcode : we take it */
+ matchLength = ZSTD_count(ip+1+EQUAL_READ32, ip+1+EQUAL_READ32-offset_1, iend) + EQUAL_READ32;
+ if (depth==0) goto _storeSequence;
+ }
+
+ /* first search (depth 0) */
+ { size_t offsetFound = 99999999;
+ size_t const ml2 = searchMax(ctx, ip, iend, &offsetFound, maxSearches, mls);
+ if (ml2 > matchLength)
+ matchLength = ml2, start = ip, offset=offsetFound;
+ }
+
+ if (matchLength < EQUAL_READ32) {
+ ip += ((ip-anchor) >> g_searchStrength) + 1; /* jump faster over incompressible sections */
+ continue;
+ }
+
+ /* let's try to find a better solution */
+ if (depth>=1)
+ while (ip<ilimit) {
+ ip ++;
+ if ((offset) && ((offset_1>0) & (MEM_read32(ip) == MEM_read32(ip - offset_1)))) {
+ size_t const mlRep = ZSTD_count(ip+EQUAL_READ32, ip+EQUAL_READ32-offset_1, iend) + EQUAL_READ32;
+ int const gain2 = (int)(mlRep * 3);
+ int const gain1 = (int)(matchLength*3 - ZSTD_highbit32((U32)offset+1) + 1);
+ if ((mlRep >= EQUAL_READ32) && (gain2 > gain1))
+ matchLength = mlRep, offset = 0, start = ip;
+ }
+ { size_t offset2=99999999;
+ size_t const ml2 = searchMax(ctx, ip, iend, &offset2, maxSearches, mls);
+ int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)offset2+1)); /* raw approx */
+ int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 4);
+ if ((ml2 >= EQUAL_READ32) && (gain2 > gain1)) {
+ matchLength = ml2, offset = offset2, start = ip;
+ continue; /* search a better one */
+ } }
+
+ /* let's find an even better one */
+ if ((depth==2) && (ip<ilimit)) {
+ ip ++;
+ if ((offset) && ((offset_1>0) & (MEM_read32(ip) == MEM_read32(ip - offset_1)))) {
+ size_t const ml2 = ZSTD_count(ip+EQUAL_READ32, ip+EQUAL_READ32-offset_1, iend) + EQUAL_READ32;
+ int const gain2 = (int)(ml2 * 4);
+ int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 1);
+ if ((ml2 >= EQUAL_READ32) && (gain2 > gain1))
+ matchLength = ml2, offset = 0, start = ip;
+ }
+ { size_t offset2=99999999;
+ size_t const ml2 = searchMax(ctx, ip, iend, &offset2, maxSearches, mls);
+ int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)offset2+1)); /* raw approx */
+ int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 7);
+ if ((ml2 >= EQUAL_READ32) && (gain2 > gain1)) {
+ matchLength = ml2, offset = offset2, start = ip;
+ continue;
+ } } }
+ break; /* nothing found : store previous solution */
+ }
+
+ /* catch up */
+ if (offset) {
+ while ((start>anchor) && (start>base+offset-ZSTD_REP_MOVE) && (start[-1] == start[-1-offset+ZSTD_REP_MOVE])) /* only search for offset within prefix */
+ { start--; matchLength++; }
+ offset_2 = offset_1; offset_1 = (U32)(offset - ZSTD_REP_MOVE);
+ }
+
+ /* store sequence */
+_storeSequence:
+ { size_t const litLength = start - anchor;
+ ZSTD_storeSeq(seqStorePtr, litLength, anchor, (U32)offset, matchLength-MINMATCH);
+ anchor = ip = start + matchLength;
+ }
+
+ /* check immediate repcode */
+ while ( (ip <= ilimit)
+ && ((offset_2>0)
+ & (MEM_read32(ip) == MEM_read32(ip - offset_2)) )) {
+ /* store sequence */
+ matchLength = ZSTD_count(ip+EQUAL_READ32, ip+EQUAL_READ32-offset_2, iend) + EQUAL_READ32;
+ offset = offset_2; offset_2 = offset_1; offset_1 = (U32)offset; /* swap repcodes */
+ ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, matchLength-MINMATCH);
+ ip += matchLength;
+ anchor = ip;
+ continue; /* faster when present ... (?) */
+ } }
+
+ /* Save reps for next block */
+ ctx->savedRep[0] = offset_1 ? offset_1 : savedOffset;
+ ctx->savedRep[1] = offset_2 ? offset_2 : savedOffset;
+
+ /* Last Literals */
+ { size_t const lastLLSize = iend - anchor;
+ memcpy(seqStorePtr->lit, anchor, lastLLSize);
+ seqStorePtr->lit += lastLLSize;
+ }
+}
+
+
+static void ZSTD_compressBlock_btlazy2(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
+{
+ ZSTD_compressBlock_lazy_generic(ctx, src, srcSize, 1, 2);
+}
+
+static void ZSTD_compressBlock_lazy2(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
+{
+ ZSTD_compressBlock_lazy_generic(ctx, src, srcSize, 0, 2);
+}
+
+static void ZSTD_compressBlock_lazy(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
+{
+ ZSTD_compressBlock_lazy_generic(ctx, src, srcSize, 0, 1);
+}
+
+static void ZSTD_compressBlock_greedy(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
+{
+ ZSTD_compressBlock_lazy_generic(ctx, src, srcSize, 0, 0);
+}
+
+
+FORCE_INLINE
+void ZSTD_compressBlock_lazy_extDict_generic(ZSTD_CCtx* ctx,
+ const void* src, size_t srcSize,
+ const U32 searchMethod, const U32 depth)
+{
+ seqStore_t* seqStorePtr = &(ctx->seqStore);
+ const BYTE* const istart = (const BYTE*)src;
+ const BYTE* ip = istart;
+ const BYTE* anchor = istart;
+ const BYTE* const iend = istart + srcSize;
+ const BYTE* const ilimit = iend - 8;
+ const BYTE* const base = ctx->base;
+ const U32 dictLimit = ctx->dictLimit;
+ const U32 lowestIndex = ctx->lowLimit;
+ const BYTE* const prefixStart = base + dictLimit;
+ const BYTE* const dictBase = ctx->dictBase;
+ const BYTE* const dictEnd = dictBase + dictLimit;
+ const BYTE* const dictStart = dictBase + ctx->lowLimit;
+
+ const U32 maxSearches = 1 << ctx->params.cParams.searchLog;
+ const U32 mls = ctx->params.cParams.searchLength;
+
+ typedef size_t (*searchMax_f)(ZSTD_CCtx* zc, const BYTE* ip, const BYTE* iLimit,
+ size_t* offsetPtr,
+ U32 maxNbAttempts, U32 matchLengthSearch);
+ searchMax_f searchMax = searchMethod ? ZSTD_BtFindBestMatch_selectMLS_extDict : ZSTD_HcFindBestMatch_extDict_selectMLS;
+
+ U32 offset_1 = ctx->rep[0], offset_2 = ctx->rep[1];
+
+ /* init */
+ ctx->nextToUpdate3 = ctx->nextToUpdate;
+ ip += (ip == prefixStart);
+
+ /* Match Loop */
+ while (ip < ilimit) {
+ size_t matchLength=0;
+ size_t offset=0;
+ const BYTE* start=ip+1;
+ U32 current = (U32)(ip-base);
+
+ /* check repCode */
+ { const U32 repIndex = (U32)(current+1 - offset_1);
+ const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
+ const BYTE* const repMatch = repBase + repIndex;
+ if (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex > lowestIndex)) /* intentional overflow */
+ if (MEM_read32(ip+1) == MEM_read32(repMatch)) {
+ /* repcode detected we should take it */
+ const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
+ matchLength = ZSTD_count_2segments(ip+1+EQUAL_READ32, repMatch+EQUAL_READ32, iend, repEnd, prefixStart) + EQUAL_READ32;
+ if (depth==0) goto _storeSequence;
+ } }
+
+ /* first search (depth 0) */
+ { size_t offsetFound = 99999999;
+ size_t const ml2 = searchMax(ctx, ip, iend, &offsetFound, maxSearches, mls);
+ if (ml2 > matchLength)
+ matchLength = ml2, start = ip, offset=offsetFound;
+ }
+
+ if (matchLength < EQUAL_READ32) {
+ ip += ((ip-anchor) >> g_searchStrength) + 1; /* jump faster over incompressible sections */
+ continue;
+ }
+
+ /* let's try to find a better solution */
+ if (depth>=1)
+ while (ip<ilimit) {
+ ip ++;
+ current++;
+ /* check repCode */
+ if (offset) {
+ const U32 repIndex = (U32)(current - offset_1);
+ const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
+ const BYTE* const repMatch = repBase + repIndex;
+ if (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex > lowestIndex)) /* intentional overflow */
+ if (MEM_read32(ip) == MEM_read32(repMatch)) {
+ /* repcode detected */
+ const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
+ size_t const repLength = ZSTD_count_2segments(ip+EQUAL_READ32, repMatch+EQUAL_READ32, iend, repEnd, prefixStart) + EQUAL_READ32;
+ int const gain2 = (int)(repLength * 3);
+ int const gain1 = (int)(matchLength*3 - ZSTD_highbit32((U32)offset+1) + 1);
+ if ((repLength >= EQUAL_READ32) && (gain2 > gain1))
+ matchLength = repLength, offset = 0, start = ip;
+ } }
+
+ /* search match, depth 1 */
+ { size_t offset2=99999999;
+ size_t const ml2 = searchMax(ctx, ip, iend, &offset2, maxSearches, mls);
+ int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)offset2+1)); /* raw approx */
+ int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 4);
+ if ((ml2 >= EQUAL_READ32) && (gain2 > gain1)) {
+ matchLength = ml2, offset = offset2, start = ip;
+ continue; /* search a better one */
+ } }
+
+ /* let's find an even better one */
+ if ((depth==2) && (ip<ilimit)) {
+ ip ++;
+ current++;
+ /* check repCode */
+ if (offset) {
+ const U32 repIndex = (U32)(current - offset_1);
+ const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
+ const BYTE* const repMatch = repBase + repIndex;
+ if (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex > lowestIndex)) /* intentional overflow */
+ if (MEM_read32(ip) == MEM_read32(repMatch)) {
+ /* repcode detected */
+ const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
+ size_t repLength = ZSTD_count_2segments(ip+EQUAL_READ32, repMatch+EQUAL_READ32, iend, repEnd, prefixStart) + EQUAL_READ32;
+ int gain2 = (int)(repLength * 4);
+ int gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 1);
+ if ((repLength >= EQUAL_READ32) && (gain2 > gain1))
+ matchLength = repLength, offset = 0, start = ip;
+ } }
+
+ /* search match, depth 2 */
+ { size_t offset2=99999999;
+ size_t const ml2 = searchMax(ctx, ip, iend, &offset2, maxSearches, mls);
+ int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)offset2+1)); /* raw approx */
+ int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 7);
+ if ((ml2 >= EQUAL_READ32) && (gain2 > gain1)) {
+ matchLength = ml2, offset = offset2, start = ip;
+ continue;
+ } } }
+ break; /* nothing found : store previous solution */
+ }
+
+ /* catch up */
+ if (offset) {
+ U32 const matchIndex = (U32)((start-base) - (offset - ZSTD_REP_MOVE));
+ const BYTE* match = (matchIndex < dictLimit) ? dictBase + matchIndex : base + matchIndex;
+ const BYTE* const mStart = (matchIndex < dictLimit) ? dictStart : prefixStart;
+ while ((start>anchor) && (match>mStart) && (start[-1] == match[-1])) { start--; match--; matchLength++; } /* catch up */
+ offset_2 = offset_1; offset_1 = (U32)(offset - ZSTD_REP_MOVE);
+ }
+
+ /* store sequence */
+_storeSequence:
+ { size_t const litLength = start - anchor;
+ ZSTD_storeSeq(seqStorePtr, litLength, anchor, (U32)offset, matchLength-MINMATCH);
+ anchor = ip = start + matchLength;
+ }
+
+ /* check immediate repcode */
+ while (ip <= ilimit) {
+ const U32 repIndex = (U32)((ip-base) - offset_2);
+ const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
+ const BYTE* const repMatch = repBase + repIndex;
+ if (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex > lowestIndex)) /* intentional overflow */
+ if (MEM_read32(ip) == MEM_read32(repMatch)) {
+ /* repcode detected we should take it */
+ const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
+ matchLength = ZSTD_count_2segments(ip+EQUAL_READ32, repMatch+EQUAL_READ32, iend, repEnd, prefixStart) + EQUAL_READ32;
+ offset = offset_2; offset_2 = offset_1; offset_1 = (U32)offset; /* swap offset history */
+ ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, matchLength-MINMATCH);
+ ip += matchLength;
+ anchor = ip;
+ continue; /* faster when present ... (?) */
+ }
+ break;
+ } }
+
+ /* Save reps for next block */
+ ctx->savedRep[0] = offset_1; ctx->savedRep[1] = offset_2;
+
+ /* Last Literals */
+ { size_t const lastLLSize = iend - anchor;
+ memcpy(seqStorePtr->lit, anchor, lastLLSize);
+ seqStorePtr->lit += lastLLSize;
+ }
+}
+
+
+void ZSTD_compressBlock_greedy_extDict(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
+{
+ ZSTD_compressBlock_lazy_extDict_generic(ctx, src, srcSize, 0, 0);
+}
+
+static void ZSTD_compressBlock_lazy_extDict(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
+{
+ ZSTD_compressBlock_lazy_extDict_generic(ctx, src, srcSize, 0, 1);
+}
+
+static void ZSTD_compressBlock_lazy2_extDict(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
+{
+ ZSTD_compressBlock_lazy_extDict_generic(ctx, src, srcSize, 0, 2);
+}
+
+static void ZSTD_compressBlock_btlazy2_extDict(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
+{
+ ZSTD_compressBlock_lazy_extDict_generic(ctx, src, srcSize, 1, 2);
+}
+
+
+/* The optimal parser */
+#include "zstd_opt.h"
+
+static void ZSTD_compressBlock_btopt(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
+{
+#ifdef ZSTD_OPT_H_91842398743
+ ZSTD_compressBlock_opt_generic(ctx, src, srcSize, 0);
+#else
+ (void)ctx; (void)src; (void)srcSize;
+ return;
+#endif
+}
+
+static void ZSTD_compressBlock_btopt2(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
+{
+#ifdef ZSTD_OPT_H_91842398743
+ ZSTD_compressBlock_opt_generic(ctx, src, srcSize, 1);
+#else
+ (void)ctx; (void)src; (void)srcSize;
+ return;
+#endif
+}
+
+static void ZSTD_compressBlock_btopt_extDict(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
+{
+#ifdef ZSTD_OPT_H_91842398743
+ ZSTD_compressBlock_opt_extDict_generic(ctx, src, srcSize, 0);
+#else
+ (void)ctx; (void)src; (void)srcSize;
+ return;
+#endif
+}
+
+static void ZSTD_compressBlock_btopt2_extDict(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
+{
+#ifdef ZSTD_OPT_H_91842398743
+ ZSTD_compressBlock_opt_extDict_generic(ctx, src, srcSize, 1);
+#else
+ (void)ctx; (void)src; (void)srcSize;
+ return;
+#endif
+}
+
+
+typedef void (*ZSTD_blockCompressor) (ZSTD_CCtx* ctx, const void* src, size_t srcSize);
+
+static ZSTD_blockCompressor ZSTD_selectBlockCompressor(ZSTD_strategy strat, int extDict)
+{
+ static const ZSTD_blockCompressor blockCompressor[2][8] = {
+ { ZSTD_compressBlock_fast, ZSTD_compressBlock_doubleFast, ZSTD_compressBlock_greedy, ZSTD_compressBlock_lazy, ZSTD_compressBlock_lazy2, ZSTD_compressBlock_btlazy2, ZSTD_compressBlock_btopt, ZSTD_compressBlock_btopt2 },
+ { ZSTD_compressBlock_fast_extDict, ZSTD_compressBlock_doubleFast_extDict, ZSTD_compressBlock_greedy_extDict, ZSTD_compressBlock_lazy_extDict,ZSTD_compressBlock_lazy2_extDict, ZSTD_compressBlock_btlazy2_extDict, ZSTD_compressBlock_btopt_extDict, ZSTD_compressBlock_btopt2_extDict }
+ };
+
+ return blockCompressor[extDict][(U32)strat];
+}
+
+
+static size_t ZSTD_compressBlock_internal(ZSTD_CCtx* zc, void* dst, size_t dstCapacity, const void* src, size_t srcSize)
+{
+ ZSTD_blockCompressor const blockCompressor = ZSTD_selectBlockCompressor(zc->params.cParams.strategy, zc->lowLimit < zc->dictLimit);
+ const BYTE* const base = zc->base;
+ const BYTE* const istart = (const BYTE*)src;
+ const U32 current = (U32)(istart-base);
+ if (srcSize < MIN_CBLOCK_SIZE+ZSTD_blockHeaderSize+1) return 0; /* don't even attempt compression below a certain srcSize */
+ ZSTD_resetSeqStore(&(zc->seqStore));
+ if (current > zc->nextToUpdate + 384)
+ zc->nextToUpdate = current - MIN(192, (U32)(current - zc->nextToUpdate - 384)); /* update tree not updated after finding very long rep matches */
+ blockCompressor(zc, src, srcSize);
+ return ZSTD_compressSequences(zc, dst, dstCapacity, srcSize);
+}
+
+
+/*! ZSTD_compress_generic() :
+* Compress a chunk of data into one or multiple blocks.
+* 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
+*/
+static size_t ZSTD_compress_generic (ZSTD_CCtx* cctx,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize,
+ U32 lastFrameChunk)
+{
+ size_t blockSize = cctx->blockSize;
+ size_t remaining = srcSize;
+ const BYTE* ip = (const BYTE*)src;
+ BYTE* const ostart = (BYTE*)dst;
+ BYTE* op = ostart;
+ U32 const maxDist = 1 << cctx->params.cParams.windowLog;
+
+ if (cctx->params.fParams.checksumFlag && srcSize)
+ XXH64_update(&cctx->xxhState, src, srcSize);
+
+ while (remaining) {
+ U32 const lastBlock = lastFrameChunk & (blockSize >= remaining);
+ size_t cSize;
+
+ if (dstCapacity < ZSTD_blockHeaderSize + MIN_CBLOCK_SIZE) return ERROR(dstSize_tooSmall); /* not enough space to store compressed block */
+ if (remaining < blockSize) blockSize = remaining;
+
+ /* preemptive overflow correction */
+ if (cctx->lowLimit > (1<<30)) {
+ U32 const btplus = (cctx->params.cParams.strategy == ZSTD_btlazy2) | (cctx->params.cParams.strategy == ZSTD_btopt) | (cctx->params.cParams.strategy == ZSTD_btopt2);
+ U32 const chainMask = (1 << (cctx->params.cParams.chainLog - btplus)) - 1;
+ U32 const supLog = MAX(cctx->params.cParams.chainLog, 17 /* blockSize */);
+ U32 const newLowLimit = (cctx->lowLimit & chainMask) + (1 << supLog); /* preserve position % chainSize, ensure current-repcode doesn't underflow */
+ U32 const correction = cctx->lowLimit - newLowLimit;
+ ZSTD_reduceIndex(cctx, correction);
+ cctx->base += correction;
+ cctx->dictBase += correction;
+ cctx->lowLimit = newLowLimit;
+ cctx->dictLimit -= correction;
+ if (cctx->nextToUpdate < correction) cctx->nextToUpdate = 0;
+ else cctx->nextToUpdate -= correction;
+ }
+
+ if ((U32)(ip+blockSize - cctx->base) > cctx->loadedDictEnd + maxDist) {
+ /* enforce maxDist */
+ U32 const newLowLimit = (U32)(ip+blockSize - cctx->base) - maxDist;
+ if (cctx->lowLimit < newLowLimit) cctx->lowLimit = newLowLimit;
+ if (cctx->dictLimit < cctx->lowLimit) cctx->dictLimit = cctx->lowLimit;
+ }
+
+ cSize = ZSTD_compressBlock_internal(cctx, op+ZSTD_blockHeaderSize, dstCapacity-ZSTD_blockHeaderSize, ip, blockSize);
+ if (ZSTD_isError(cSize)) return cSize;
+
+ if (cSize == 0) { /* block is not compressible */
+ U32 const cBlockHeader24 = lastBlock + (((U32)bt_raw)<<1) + (U32)(blockSize << 3);
+ if (blockSize + ZSTD_blockHeaderSize > dstCapacity) return ERROR(dstSize_tooSmall);
+ MEM_writeLE32(op, cBlockHeader24); /* no pb, 4th byte will be overwritten */
+ memcpy(op + ZSTD_blockHeaderSize, ip, blockSize);
+ cSize = ZSTD_blockHeaderSize+blockSize;
+ } else {
+ U32 const cBlockHeader24 = lastBlock + (((U32)bt_compressed)<<1) + (U32)(cSize << 3);
+ MEM_writeLE24(op, cBlockHeader24);
+ cSize += ZSTD_blockHeaderSize;
+ }
+
+ remaining -= blockSize;
+ dstCapacity -= cSize;
+ ip += blockSize;
+ op += cSize;
+ }
+
+ if (lastFrameChunk && (op>ostart)) cctx->stage = ZSTDcs_ending;
+ return op-ostart;
+}
+
+
+static size_t ZSTD_writeFrameHeader(void* dst, size_t dstCapacity,
+ ZSTD_parameters params, U64 pledgedSrcSize, U32 dictID)
+{ BYTE* const op = (BYTE*)dst;
+ U32 const dictIDSizeCode = (dictID>0) + (dictID>=256) + (dictID>=65536); /* 0-3 */
+ U32 const checksumFlag = params.fParams.checksumFlag>0;
+ U32 const windowSize = 1U << params.cParams.windowLog;
+ U32 const singleSegment = params.fParams.contentSizeFlag && (windowSize > (pledgedSrcSize-1));
+ BYTE const windowLogByte = (BYTE)((params.cParams.windowLog - ZSTD_WINDOWLOG_ABSOLUTEMIN) << 3);
+ U32 const fcsCode = params.fParams.contentSizeFlag ?
+ (pledgedSrcSize>=256) + (pledgedSrcSize>=65536+256) + (pledgedSrcSize>=0xFFFFFFFFU) : /* 0-3 */
+ 0;
+ BYTE const frameHeaderDecriptionByte = (BYTE)(dictIDSizeCode + (checksumFlag<<2) + (singleSegment<<5) + (fcsCode<<6) );
+ size_t pos;
+
+ if (dstCapacity < ZSTD_frameHeaderSize_max) return ERROR(dstSize_tooSmall);
+
+ MEM_writeLE32(dst, ZSTD_MAGICNUMBER);
+ op[4] = frameHeaderDecriptionByte; pos=5;
+ if (!singleSegment) op[pos++] = windowLogByte;
+ switch(dictIDSizeCode)
+ {
+ default: /* impossible */
+ case 0 : break;
+ case 1 : op[pos] = (BYTE)(dictID); pos++; break;
+ case 2 : MEM_writeLE16(op+pos, (U16)dictID); pos+=2; break;
+ case 3 : MEM_writeLE32(op+pos, dictID); pos+=4; break;
+ }
+ switch(fcsCode)
+ {
+ default: /* impossible */
+ case 0 : if (singleSegment) op[pos++] = (BYTE)(pledgedSrcSize); break;
+ case 1 : MEM_writeLE16(op+pos, (U16)(pledgedSrcSize-256)); pos+=2; break;
+ case 2 : MEM_writeLE32(op+pos, (U32)(pledgedSrcSize)); pos+=4; break;
+ case 3 : MEM_writeLE64(op+pos, (U64)(pledgedSrcSize)); pos+=8; break;
+ }
+ return pos;
+}
+
+
+static size_t ZSTD_compressContinue_internal (ZSTD_CCtx* cctx,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize,
+ U32 frame, U32 lastFrameChunk)
+{
+ const BYTE* const ip = (const BYTE*) src;
+ size_t fhSize = 0;
+
+ if (cctx->stage==ZSTDcs_created) return ERROR(stage_wrong); /* missing init (ZSTD_compressBegin) */
+
+ if (frame && (cctx->stage==ZSTDcs_init)) {
+ fhSize = ZSTD_writeFrameHeader(dst, dstCapacity, cctx->params, cctx->frameContentSize, cctx->dictID);
+ if (ZSTD_isError(fhSize)) return fhSize;
+ dstCapacity -= fhSize;
+ dst = (char*)dst + fhSize;
+ cctx->stage = ZSTDcs_ongoing;
+ }
+
+ /* Check if blocks follow each other */
+ if (src != cctx->nextSrc) {
+ /* not contiguous */
+ ptrdiff_t const delta = cctx->nextSrc - ip;
+ cctx->lowLimit = cctx->dictLimit;
+ cctx->dictLimit = (U32)(cctx->nextSrc - cctx->base);
+ cctx->dictBase = cctx->base;
+ cctx->base -= delta;
+ cctx->nextToUpdate = cctx->dictLimit;
+ if (cctx->dictLimit - cctx->lowLimit < HASH_READ_SIZE) cctx->lowLimit = cctx->dictLimit; /* too small extDict */
+ }
+
+ /* if input and dictionary overlap : reduce dictionary (area presumed modified by input) */
+ if ((ip+srcSize > cctx->dictBase + cctx->lowLimit) & (ip < cctx->dictBase + cctx->dictLimit)) {
+ ptrdiff_t const highInputIdx = (ip + srcSize) - cctx->dictBase;
+ U32 const lowLimitMax = (highInputIdx > (ptrdiff_t)cctx->dictLimit) ? cctx->dictLimit : (U32)highInputIdx;
+ cctx->lowLimit = lowLimitMax;
+ }
+
+ cctx->nextSrc = ip + srcSize;
+
+ { size_t const cSize = frame ?
+ ZSTD_compress_generic (cctx, dst, dstCapacity, src, srcSize, lastFrameChunk) :
+ ZSTD_compressBlock_internal (cctx, dst, dstCapacity, src, srcSize);
+ if (ZSTD_isError(cSize)) return cSize;
+ return cSize + fhSize;
+ }
+}
+
+
+size_t ZSTD_compressContinue (ZSTD_CCtx* cctx,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize)
+{
+ return ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 1, 0);
+}
+
+
+size_t ZSTD_getBlockSizeMax(ZSTD_CCtx* cctx)
+{
+ return MIN (ZSTD_BLOCKSIZE_ABSOLUTEMAX, 1 << cctx->params.cParams.windowLog);
+}
+
+size_t ZSTD_compressBlock(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize)
+{
+ size_t const blockSizeMax = ZSTD_getBlockSizeMax(cctx);
+ if (srcSize > blockSizeMax) return ERROR(srcSize_wrong);
+ return ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 0, 0);
+}
+
+
+static size_t ZSTD_loadDictionaryContent(ZSTD_CCtx* zc, const void* src, size_t srcSize)
+{
+ const BYTE* const ip = (const BYTE*) src;
+ const BYTE* const iend = ip + srcSize;
+
+ /* input becomes current prefix */
+ zc->lowLimit = zc->dictLimit;
+ zc->dictLimit = (U32)(zc->nextSrc - zc->base);
+ zc->dictBase = zc->base;
+ zc->base += ip - zc->nextSrc;
+ zc->nextToUpdate = zc->dictLimit;
+ zc->loadedDictEnd = (U32)(iend - zc->base);
+
+ zc->nextSrc = iend;
+ if (srcSize <= HASH_READ_SIZE) return 0;
+
+ switch(zc->params.cParams.strategy)
+ {
+ case ZSTD_fast:
+ ZSTD_fillHashTable (zc, iend, zc->params.cParams.searchLength);
+ break;
+
+ case ZSTD_dfast:
+ ZSTD_fillDoubleHashTable (zc, iend, zc->params.cParams.searchLength);
+ break;
+
+ case ZSTD_greedy:
+ case ZSTD_lazy:
+ case ZSTD_lazy2:
+ ZSTD_insertAndFindFirstIndex (zc, iend-HASH_READ_SIZE, zc->params.cParams.searchLength);
+ break;
+
+ case ZSTD_btlazy2:
+ case ZSTD_btopt:
+ case ZSTD_btopt2:
+ ZSTD_updateTree(zc, iend-HASH_READ_SIZE, iend, 1 << zc->params.cParams.searchLog, zc->params.cParams.searchLength);
+ break;
+
+ default:
+ return ERROR(GENERIC); /* strategy doesn't exist; impossible */
+ }
+
+ zc->nextToUpdate = zc->loadedDictEnd;
+ return 0;
+}
+
+
+/* Dictionaries that assign zero probability to symbols that show up causes problems
+ when FSE encoding. Refuse dictionaries that assign zero probability to symbols
+ that we may encounter during compression.
+ NOTE: This behavior is not standard and could be improved in the future. */
+static size_t ZSTD_checkDictNCount(short* normalizedCounter, unsigned dictMaxSymbolValue, unsigned maxSymbolValue) {
+ U32 s;
+ if (dictMaxSymbolValue < maxSymbolValue) return ERROR(dictionary_corrupted);
+ for (s = 0; s <= maxSymbolValue; ++s) {
+ if (normalizedCounter[s] == 0) return ERROR(dictionary_corrupted);
+ }
+ return 0;
+}
+
+
+/* Dictionary format :
+ Magic == ZSTD_DICT_MAGIC (4 bytes)
+ HUF_writeCTable(256)
+ FSE_writeNCount(off)
+ FSE_writeNCount(ml)
+ FSE_writeNCount(ll)
+ RepOffsets
+ Dictionary content
+*/
+/*! ZSTD_loadDictEntropyStats() :
+ @return : size read from dictionary
+ note : magic number supposed already checked */
+static size_t ZSTD_loadDictEntropyStats(ZSTD_CCtx* cctx, const void* dict, size_t dictSize)
+{
+ const BYTE* dictPtr = (const BYTE*)dict;
+ const BYTE* const dictEnd = dictPtr + dictSize;
+ short offcodeNCount[MaxOff+1];
+ unsigned offcodeMaxValue = MaxOff;
+
+ { size_t const hufHeaderSize = HUF_readCTable(cctx->hufTable, 255, dict, dictSize);
+ if (HUF_isError(hufHeaderSize)) return ERROR(dictionary_corrupted);
+ dictPtr += hufHeaderSize;
+ }
+
+ { unsigned offcodeLog;
+ size_t const offcodeHeaderSize = FSE_readNCount(offcodeNCount, &offcodeMaxValue, &offcodeLog, dictPtr, dictEnd-dictPtr);
+ if (FSE_isError(offcodeHeaderSize)) return ERROR(dictionary_corrupted);
+ if (offcodeLog > OffFSELog) return ERROR(dictionary_corrupted);
+ /* Defer checking offcodeMaxValue because we need to know the size of the dictionary content */
+ CHECK_E (FSE_buildCTable(cctx->offcodeCTable, offcodeNCount, offcodeMaxValue, offcodeLog), dictionary_corrupted);
+ dictPtr += offcodeHeaderSize;
+ }
+
+ { short matchlengthNCount[MaxML+1];
+ unsigned matchlengthMaxValue = MaxML, matchlengthLog;
+ size_t const matchlengthHeaderSize = FSE_readNCount(matchlengthNCount, &matchlengthMaxValue, &matchlengthLog, dictPtr, dictEnd-dictPtr);
+ if (FSE_isError(matchlengthHeaderSize)) return ERROR(dictionary_corrupted);
+ if (matchlengthLog > MLFSELog) return ERROR(dictionary_corrupted);
+ /* Every match length code must have non-zero probability */
+ CHECK_F (ZSTD_checkDictNCount(matchlengthNCount, matchlengthMaxValue, MaxML));
+ CHECK_E (FSE_buildCTable(cctx->matchlengthCTable, matchlengthNCount, matchlengthMaxValue, matchlengthLog), dictionary_corrupted);
+ dictPtr += matchlengthHeaderSize;
+ }
+
+ { short litlengthNCount[MaxLL+1];
+ unsigned litlengthMaxValue = MaxLL, litlengthLog;
+ size_t const litlengthHeaderSize = FSE_readNCount(litlengthNCount, &litlengthMaxValue, &litlengthLog, dictPtr, dictEnd-dictPtr);
+ if (FSE_isError(litlengthHeaderSize)) return ERROR(dictionary_corrupted);
+ if (litlengthLog > LLFSELog) return ERROR(dictionary_corrupted);
+ /* Every literal length code must have non-zero probability */
+ CHECK_F (ZSTD_checkDictNCount(litlengthNCount, litlengthMaxValue, MaxLL));
+ CHECK_E(FSE_buildCTable(cctx->litlengthCTable, litlengthNCount, litlengthMaxValue, litlengthLog), dictionary_corrupted);
+ dictPtr += litlengthHeaderSize;
+ }
+
+ if (dictPtr+12 > dictEnd) return ERROR(dictionary_corrupted);
+ cctx->rep[0] = MEM_readLE32(dictPtr+0); if (cctx->rep[0] >= dictSize) return ERROR(dictionary_corrupted);
+ cctx->rep[1] = MEM_readLE32(dictPtr+4); if (cctx->rep[1] >= dictSize) return ERROR(dictionary_corrupted);
+ cctx->rep[2] = MEM_readLE32(dictPtr+8); if (cctx->rep[2] >= dictSize) return ERROR(dictionary_corrupted);
+ dictPtr += 12;
+
+ { U32 offcodeMax = MaxOff;
+ if ((size_t)(dictEnd - dictPtr) <= ((U32)-1) - 128 KB) {
+ U32 const maxOffset = (U32)(dictEnd - dictPtr) + 128 KB; /* The maximum offset that must be supported */
+ /* Calculate minimum offset code required to represent maxOffset */
+ offcodeMax = ZSTD_highbit32(maxOffset);
+ }
+ /* Every possible supported offset <= dictContentSize + 128 KB must be representable */
+ CHECK_F (ZSTD_checkDictNCount(offcodeNCount, offcodeMaxValue, MIN(offcodeMax, MaxOff)));
+ }
+
+ cctx->flagStaticTables = 1;
+ return dictPtr - (const BYTE*)dict;
+}
+
+/** ZSTD_compress_insertDictionary() :
+* @return : 0, or an error code */
+static size_t ZSTD_compress_insertDictionary(ZSTD_CCtx* zc, const void* dict, size_t dictSize)
+{
+ if ((dict==NULL) || (dictSize<=8)) return 0;
+
+ /* default : dict is pure content */
+ if (MEM_readLE32(dict) != ZSTD_DICT_MAGIC) return ZSTD_loadDictionaryContent(zc, dict, dictSize);
+ zc->dictID = zc->params.fParams.noDictIDFlag ? 0 : MEM_readLE32((const char*)dict+4);
+
+ /* known magic number : dict is parsed for entropy stats and content */
+ { size_t const loadError = ZSTD_loadDictEntropyStats(zc, (const char*)dict+8 /* skip dictHeader */, dictSize-8);
+ size_t const eSize = loadError + 8;
+ if (ZSTD_isError(loadError)) return loadError;
+ return ZSTD_loadDictionaryContent(zc, (const char*)dict+eSize, dictSize-eSize);
+ }
+}
+
+
+/*! ZSTD_compressBegin_internal() :
+* @return : 0, or an error code */
+static size_t ZSTD_compressBegin_internal(ZSTD_CCtx* cctx,
+ const void* dict, size_t dictSize,
+ ZSTD_parameters params, U64 pledgedSrcSize)
+{
+ ZSTD_compResetPolicy_e const crp = dictSize ? ZSTDcrp_fullReset : ZSTDcrp_continue;
+ CHECK_F(ZSTD_resetCCtx_advanced(cctx, params, pledgedSrcSize, crp));
+ return ZSTD_compress_insertDictionary(cctx, dict, dictSize);
+}
+
+
+/*! ZSTD_compressBegin_advanced() :
+* @return : 0, or an error code */
+size_t ZSTD_compressBegin_advanced(ZSTD_CCtx* cctx,
+ const void* dict, size_t dictSize,
+ ZSTD_parameters params, unsigned long long pledgedSrcSize)
+{
+ /* compression parameters verification and optimization */
+ CHECK_F(ZSTD_checkCParams(params.cParams));
+ return ZSTD_compressBegin_internal(cctx, dict, dictSize, params, pledgedSrcSize);
+}
+
+
+size_t ZSTD_compressBegin_usingDict(ZSTD_CCtx* cctx, const void* dict, size_t dictSize, int compressionLevel)
+{
+ ZSTD_parameters const params = ZSTD_getParams(compressionLevel, 0, dictSize);
+ return ZSTD_compressBegin_internal(cctx, dict, dictSize, params, 0);
+}
+
+
+size_t ZSTD_compressBegin(ZSTD_CCtx* zc, int compressionLevel)
+{
+ return ZSTD_compressBegin_usingDict(zc, NULL, 0, compressionLevel);
+}
+
+
+/*! ZSTD_writeEpilogue() :
+* Ends a frame.
+* @return : nb of bytes written into dst (or an error code) */
+static size_t ZSTD_writeEpilogue(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity)
+{
+ BYTE* const ostart = (BYTE*)dst;
+ BYTE* op = ostart;
+ size_t fhSize = 0;
+
+ if (cctx->stage == ZSTDcs_created) return ERROR(stage_wrong); /* init missing */
+
+ /* special case : empty frame */
+ if (cctx->stage == ZSTDcs_init) {
+ fhSize = ZSTD_writeFrameHeader(dst, dstCapacity, cctx->params, 0, 0);
+ if (ZSTD_isError(fhSize)) return fhSize;
+ dstCapacity -= fhSize;
+ op += fhSize;
+ cctx->stage = ZSTDcs_ongoing;
+ }
+
+ if (cctx->stage != ZSTDcs_ending) {
+ /* write one last empty block, make it the "last" block */
+ U32 const cBlockHeader24 = 1 /* last block */ + (((U32)bt_raw)<<1) + 0;
+ if (dstCapacity<4) return ERROR(dstSize_tooSmall);
+ MEM_writeLE32(op, cBlockHeader24);
+ op += ZSTD_blockHeaderSize;
+ dstCapacity -= ZSTD_blockHeaderSize;
+ }
+
+ if (cctx->params.fParams.checksumFlag) {
+ U32 const checksum = (U32) XXH64_digest(&cctx->xxhState);
+ if (dstCapacity<4) return ERROR(dstSize_tooSmall);
+ MEM_writeLE32(op, checksum);
+ op += 4;
+ }
+
+ cctx->stage = ZSTDcs_created; /* return to "created but no init" status */
+ return op-ostart;
+}
+
+
+size_t ZSTD_compressEnd (ZSTD_CCtx* cctx,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize)
+{
+ size_t endResult;
+ size_t const cSize = ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 1, 1);
+ if (ZSTD_isError(cSize)) return cSize;
+ endResult = ZSTD_writeEpilogue(cctx, (char*)dst + cSize, dstCapacity-cSize);
+ if (ZSTD_isError(endResult)) return endResult;
+ return cSize + endResult;
+}
+
+
+static size_t ZSTD_compress_internal (ZSTD_CCtx* cctx,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize,
+ const void* dict,size_t dictSize,
+ ZSTD_parameters params)
+{
+ CHECK_F(ZSTD_compressBegin_internal(cctx, dict, dictSize, params, srcSize));
+ return ZSTD_compressEnd(cctx, dst, dstCapacity, src, srcSize);
+}
+
+size_t ZSTD_compress_advanced (ZSTD_CCtx* ctx,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize,
+ const void* dict,size_t dictSize,
+ ZSTD_parameters params)
+{
+ CHECK_F(ZSTD_checkCParams(params.cParams));
+ return ZSTD_compress_internal(ctx, dst, dstCapacity, src, srcSize, dict, dictSize, params);
+}
+
+size_t ZSTD_compress_usingDict(ZSTD_CCtx* ctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize, const void* dict, size_t dictSize, int compressionLevel)
+{
+ ZSTD_parameters params = ZSTD_getParams(compressionLevel, srcSize, dictSize);
+ params.fParams.contentSizeFlag = 1;
+ return ZSTD_compress_internal(ctx, dst, dstCapacity, src, srcSize, dict, dictSize, params);
+}
+
+size_t ZSTD_compressCCtx (ZSTD_CCtx* ctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize, int compressionLevel)
+{
+ return ZSTD_compress_usingDict(ctx, dst, dstCapacity, src, srcSize, NULL, 0, compressionLevel);
+}
+
+size_t ZSTD_compress(void* dst, size_t dstCapacity, const void* src, size_t srcSize, int compressionLevel)
+{
+ size_t result;
+ ZSTD_CCtx ctxBody;
+ memset(&ctxBody, 0, sizeof(ctxBody));
+ memcpy(&ctxBody.customMem, &defaultCustomMem, sizeof(ZSTD_customMem));
+ result = ZSTD_compressCCtx(&ctxBody, dst, dstCapacity, src, srcSize, compressionLevel);
+ ZSTD_free(ctxBody.workSpace, defaultCustomMem); /* can't free ctxBody itself, as it's on stack; free only heap content */
+ return result;
+}
+
+
+/* ===== Dictionary API ===== */
+
+struct ZSTD_CDict_s {
+ void* dictContent;
+ size_t dictContentSize;
+ ZSTD_CCtx* refContext;
+}; /* typedef'd tp ZSTD_CDict within "zstd.h" */
+
+size_t ZSTD_sizeof_CDict(const ZSTD_CDict* cdict)
+{
+ if (cdict==NULL) return 0; /* support sizeof on NULL */
+ return ZSTD_sizeof_CCtx(cdict->refContext) + cdict->dictContentSize;
+}
+
+ZSTD_CDict* ZSTD_createCDict_advanced(const void* dict, size_t dictSize, ZSTD_parameters params, ZSTD_customMem customMem)
+{
+ if (!customMem.customAlloc && !customMem.customFree) customMem = defaultCustomMem;
+ if (!customMem.customAlloc || !customMem.customFree) return NULL;
+
+ { ZSTD_CDict* const cdict = (ZSTD_CDict*) ZSTD_malloc(sizeof(ZSTD_CDict), customMem);
+ void* const dictContent = ZSTD_malloc(dictSize, customMem);
+ ZSTD_CCtx* const cctx = ZSTD_createCCtx_advanced(customMem);
+
+ if (!dictContent || !cdict || !cctx) {
+ ZSTD_free(dictContent, customMem);
+ ZSTD_free(cdict, customMem);
+ ZSTD_free(cctx, customMem);
+ return NULL;
+ }
+
+ if (dictSize) {
+ memcpy(dictContent, dict, dictSize);
+ }
+ { size_t const errorCode = ZSTD_compressBegin_advanced(cctx, dictContent, dictSize, params, 0);
+ if (ZSTD_isError(errorCode)) {
+ ZSTD_free(dictContent, customMem);
+ ZSTD_free(cdict, customMem);
+ ZSTD_free(cctx, customMem);
+ return NULL;
+ } }
+
+ cdict->dictContent = dictContent;
+ cdict->dictContentSize = dictSize;
+ cdict->refContext = cctx;
+ return cdict;
+ }
+}
+
+ZSTD_CDict* ZSTD_createCDict(const void* dict, size_t dictSize, int compressionLevel)
+{
+ ZSTD_customMem const allocator = { NULL, NULL, NULL };
+ ZSTD_parameters params = ZSTD_getParams(compressionLevel, 0, dictSize);
+ params.fParams.contentSizeFlag = 1;
+ return ZSTD_createCDict_advanced(dict, dictSize, params, allocator);
+}
+
+size_t ZSTD_freeCDict(ZSTD_CDict* cdict)
+{
+ if (cdict==NULL) return 0; /* support free on NULL */
+ { ZSTD_customMem const cMem = cdict->refContext->customMem;
+ ZSTD_freeCCtx(cdict->refContext);
+ ZSTD_free(cdict->dictContent, cMem);
+ ZSTD_free(cdict, cMem);
+ return 0;
+ }
+}
+
+static ZSTD_parameters ZSTD_getParamsFromCDict(const ZSTD_CDict* cdict) {
+ return ZSTD_getParamsFromCCtx(cdict->refContext);
+}
+
+size_t ZSTD_compressBegin_usingCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict, U64 pledgedSrcSize)
+{
+ if (cdict->dictContentSize) CHECK_F(ZSTD_copyCCtx(cctx, cdict->refContext, pledgedSrcSize))
+ else CHECK_F(ZSTD_compressBegin_advanced(cctx, NULL, 0, cdict->refContext->params, pledgedSrcSize));
+ return 0;
+}
+
+/*! ZSTD_compress_usingCDict() :
+* Compression using a digested Dictionary.
+* Faster startup than ZSTD_compress_usingDict(), recommended when same dictionary is used multiple times.
+* Note that compression level is decided during dictionary creation */
+size_t ZSTD_compress_usingCDict(ZSTD_CCtx* cctx,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize,
+ const ZSTD_CDict* cdict)
+{
+ CHECK_F(ZSTD_compressBegin_usingCDict(cctx, cdict, srcSize));
+
+ if (cdict->refContext->params.fParams.contentSizeFlag==1) {
+ cctx->params.fParams.contentSizeFlag = 1;
+ cctx->frameContentSize = srcSize;
+ }
+
+ return ZSTD_compressEnd(cctx, dst, dstCapacity, src, srcSize);
+}
+
+
+
+/* ******************************************************************
+* Streaming
+********************************************************************/
+
+typedef enum { zcss_init, zcss_load, zcss_flush, zcss_final } ZSTD_cStreamStage;
+
+struct ZSTD_CStream_s {
+ ZSTD_CCtx* cctx;
+ ZSTD_CDict* cdictLocal;
+ const ZSTD_CDict* cdict;
+ char* inBuff;
+ size_t inBuffSize;
+ size_t inToCompress;
+ size_t inBuffPos;
+ size_t inBuffTarget;
+ size_t blockSize;
+ char* outBuff;
+ size_t outBuffSize;
+ size_t outBuffContentSize;
+ size_t outBuffFlushedSize;
+ ZSTD_cStreamStage stage;
+ U32 checksum;
+ U32 frameEnded;
+ ZSTD_parameters params;
+ ZSTD_customMem customMem;
+}; /* typedef'd to ZSTD_CStream within "zstd.h" */
+
+ZSTD_CStream* ZSTD_createCStream(void)
+{
+ return ZSTD_createCStream_advanced(defaultCustomMem);
+}
+
+ZSTD_CStream* ZSTD_createCStream_advanced(ZSTD_customMem customMem)
+{
+ ZSTD_CStream* zcs;
+
+ if (!customMem.customAlloc && !customMem.customFree) customMem = defaultCustomMem;
+ if (!customMem.customAlloc || !customMem.customFree) return NULL;
+
+ zcs = (ZSTD_CStream*)ZSTD_malloc(sizeof(ZSTD_CStream), customMem);
+ if (zcs==NULL) return NULL;
+ memset(zcs, 0, sizeof(ZSTD_CStream));
+ memcpy(&zcs->customMem, &customMem, sizeof(ZSTD_customMem));
+ zcs->cctx = ZSTD_createCCtx_advanced(customMem);
+ if (zcs->cctx == NULL) { ZSTD_freeCStream(zcs); return NULL; }
+ return zcs;
+}
+
+size_t ZSTD_freeCStream(ZSTD_CStream* zcs)
+{
+ if (zcs==NULL) return 0; /* support free on NULL */
+ { ZSTD_customMem const cMem = zcs->customMem;
+ ZSTD_freeCCtx(zcs->cctx);
+ ZSTD_freeCDict(zcs->cdictLocal);
+ ZSTD_free(zcs->inBuff, cMem);
+ ZSTD_free(zcs->outBuff, cMem);
+ ZSTD_free(zcs, cMem);
+ return 0;
+ }
+}
+
+
+/*====== Initialization ======*/
+
+size_t ZSTD_CStreamInSize(void) { return ZSTD_BLOCKSIZE_ABSOLUTEMAX; }
+size_t ZSTD_CStreamOutSize(void) { return ZSTD_compressBound(ZSTD_BLOCKSIZE_ABSOLUTEMAX) + ZSTD_blockHeaderSize + 4 /* 32-bits hash */ ; }
+
+size_t ZSTD_resetCStream(ZSTD_CStream* zcs, unsigned long long pledgedSrcSize)
+{
+ if (zcs->inBuffSize==0) return ERROR(stage_wrong); /* zcs has not been init at least once */
+
+ if (zcs->cdict) CHECK_F(ZSTD_compressBegin_usingCDict(zcs->cctx, zcs->cdict, pledgedSrcSize))
+ else CHECK_F(ZSTD_compressBegin_advanced(zcs->cctx, NULL, 0, zcs->params, pledgedSrcSize));
+
+ zcs->inToCompress = 0;
+ zcs->inBuffPos = 0;
+ zcs->inBuffTarget = zcs->blockSize;
+ zcs->outBuffContentSize = zcs->outBuffFlushedSize = 0;
+ zcs->stage = zcss_load;
+ zcs->frameEnded = 0;
+ return 0; /* ready to go */
+}
+
+size_t ZSTD_initCStream_advanced(ZSTD_CStream* zcs,
+ const void* dict, size_t dictSize,
+ ZSTD_parameters params, unsigned long long pledgedSrcSize)
+{
+ /* allocate buffers */
+ { size_t const neededInBuffSize = (size_t)1 << params.cParams.windowLog;
+ if (zcs->inBuffSize < neededInBuffSize) {
+ zcs->inBuffSize = neededInBuffSize;
+ ZSTD_free(zcs->inBuff, zcs->customMem);
+ zcs->inBuff = (char*) ZSTD_malloc(neededInBuffSize, zcs->customMem);
+ if (zcs->inBuff == NULL) return ERROR(memory_allocation);
+ }
+ zcs->blockSize = MIN(ZSTD_BLOCKSIZE_ABSOLUTEMAX, neededInBuffSize);
+ }
+ if (zcs->outBuffSize < ZSTD_compressBound(zcs->blockSize)+1) {
+ zcs->outBuffSize = ZSTD_compressBound(zcs->blockSize)+1;
+ ZSTD_free(zcs->outBuff, zcs->customMem);
+ zcs->outBuff = (char*) ZSTD_malloc(zcs->outBuffSize, zcs->customMem);
+ if (zcs->outBuff == NULL) return ERROR(memory_allocation);
+ }
+
+ if (dict) {
+ ZSTD_freeCDict(zcs->cdictLocal);
+ zcs->cdictLocal = ZSTD_createCDict_advanced(dict, dictSize, params, zcs->customMem);
+ if (zcs->cdictLocal == NULL) return ERROR(memory_allocation);
+ zcs->cdict = zcs->cdictLocal;
+ } else zcs->cdict = NULL;
+
+ zcs->checksum = params.fParams.checksumFlag > 0;
+ zcs->params = params;
+
+ return ZSTD_resetCStream(zcs, pledgedSrcSize);
+}
+
+/* note : cdict must outlive compression session */
+size_t ZSTD_initCStream_usingCDict(ZSTD_CStream* zcs, const ZSTD_CDict* cdict)
+{
+ ZSTD_parameters const params = ZSTD_getParamsFromCDict(cdict);
+ size_t const initError = ZSTD_initCStream_advanced(zcs, NULL, 0, params, 0);
+ zcs->cdict = cdict;
+ return initError;
+}
+
+size_t ZSTD_initCStream_usingDict(ZSTD_CStream* zcs, const void* dict, size_t dictSize, int compressionLevel)
+{
+ ZSTD_parameters const params = ZSTD_getParams(compressionLevel, 0, dictSize);
+ return ZSTD_initCStream_advanced(zcs, dict, dictSize, params, 0);
+}
+
+size_t ZSTD_initCStream(ZSTD_CStream* zcs, int compressionLevel)
+{
+ return ZSTD_initCStream_usingDict(zcs, NULL, 0, compressionLevel);
+}
+
+size_t ZSTD_sizeof_CStream(const ZSTD_CStream* zcs)
+{
+ if (zcs==NULL) return 0; /* support sizeof on NULL */
+ return sizeof(zcs) + ZSTD_sizeof_CCtx(zcs->cctx) + ZSTD_sizeof_CDict(zcs->cdictLocal) + zcs->outBuffSize + zcs->inBuffSize;
+}
+
+/*====== Compression ======*/
+
+typedef enum { zsf_gather, zsf_flush, zsf_end } ZSTD_flush_e;
+
+MEM_STATIC size_t ZSTD_limitCopy(void* dst, size_t dstCapacity, const void* src, size_t srcSize)
+{
+ size_t const length = MIN(dstCapacity, srcSize);
+ memcpy(dst, src, length);
+ return length;
+}
+
+static size_t ZSTD_compressStream_generic(ZSTD_CStream* zcs,
+ void* dst, size_t* dstCapacityPtr,
+ const void* src, size_t* srcSizePtr,
+ ZSTD_flush_e const flush)
+{
+ U32 someMoreWork = 1;
+ const char* const istart = (const char*)src;
+ const char* const iend = istart + *srcSizePtr;
+ const char* ip = istart;
+ char* const ostart = (char*)dst;
+ char* const oend = ostart + *dstCapacityPtr;
+ char* op = ostart;
+
+ while (someMoreWork) {
+ switch(zcs->stage)
+ {
+ case zcss_init: return ERROR(init_missing); /* call ZBUFF_compressInit() first ! */
+
+ case zcss_load:
+ /* complete inBuffer */
+ { size_t const toLoad = zcs->inBuffTarget - zcs->inBuffPos;
+ size_t const loaded = ZSTD_limitCopy(zcs->inBuff + zcs->inBuffPos, toLoad, ip, iend-ip);
+ zcs->inBuffPos += loaded;
+ ip += loaded;
+ if ( (zcs->inBuffPos==zcs->inToCompress) || (!flush && (toLoad != loaded)) ) {
+ someMoreWork = 0; break; /* not enough input to get a full block : stop there, wait for more */
+ } }
+ /* compress current block (note : this stage cannot be stopped in the middle) */
+ { void* cDst;
+ size_t cSize;
+ size_t const iSize = zcs->inBuffPos - zcs->inToCompress;
+ size_t oSize = oend-op;
+ if (oSize >= ZSTD_compressBound(iSize))
+ cDst = op; /* compress directly into output buffer (avoid flush stage) */
+ else
+ cDst = zcs->outBuff, oSize = zcs->outBuffSize;
+ cSize = (flush == zsf_end) ?
+ ZSTD_compressEnd(zcs->cctx, cDst, oSize, zcs->inBuff + zcs->inToCompress, iSize) :
+ ZSTD_compressContinue(zcs->cctx, cDst, oSize, zcs->inBuff + zcs->inToCompress, iSize);
+ if (ZSTD_isError(cSize)) return cSize;
+ if (flush == zsf_end) zcs->frameEnded = 1;
+ /* prepare next block */
+ zcs->inBuffTarget = zcs->inBuffPos + zcs->blockSize;
+ if (zcs->inBuffTarget > zcs->inBuffSize)
+ zcs->inBuffPos = 0, zcs->inBuffTarget = zcs->blockSize; /* note : inBuffSize >= blockSize */
+ zcs->inToCompress = zcs->inBuffPos;
+ if (cDst == op) { op += cSize; break; } /* no need to flush */
+ zcs->outBuffContentSize = cSize;
+ zcs->outBuffFlushedSize = 0;
+ zcs->stage = zcss_flush; /* pass-through to flush stage */
+ }
+
+ case zcss_flush:
+ { size_t const toFlush = zcs->outBuffContentSize - zcs->outBuffFlushedSize;
+ size_t const flushed = ZSTD_limitCopy(op, oend-op, zcs->outBuff + zcs->outBuffFlushedSize, toFlush);
+ op += flushed;
+ zcs->outBuffFlushedSize += flushed;
+ if (toFlush!=flushed) { someMoreWork = 0; break; } /* dst too small to store flushed data : stop there */
+ zcs->outBuffContentSize = zcs->outBuffFlushedSize = 0;
+ zcs->stage = zcss_load;
+ break;
+ }
+
+ case zcss_final:
+ someMoreWork = 0; /* do nothing */
+ break;
+
+ default:
+ return ERROR(GENERIC); /* impossible */
+ }
+ }
+
+ *srcSizePtr = ip - istart;
+ *dstCapacityPtr = op - ostart;
+ if (zcs->frameEnded) return 0;
+ { size_t hintInSize = zcs->inBuffTarget - zcs->inBuffPos;
+ if (hintInSize==0) hintInSize = zcs->blockSize;
+ return hintInSize;
+ }
+}
+
+size_t ZSTD_compressStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output, ZSTD_inBuffer* input)
+{
+ size_t sizeRead = input->size - input->pos;
+ size_t sizeWritten = output->size - output->pos;
+ size_t const result = ZSTD_compressStream_generic(zcs,
+ (char*)(output->dst) + output->pos, &sizeWritten,
+ (const char*)(input->src) + input->pos, &sizeRead, zsf_gather);
+ input->pos += sizeRead;
+ output->pos += sizeWritten;
+ return result;
+}
+
+
+/*====== Finalize ======*/
+
+/*! ZSTD_flushStream() :
+* @return : amount of data remaining to flush */
+size_t ZSTD_flushStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output)
+{
+ size_t srcSize = 0;
+ size_t sizeWritten = output->size - output->pos;
+ size_t const result = ZSTD_compressStream_generic(zcs,
+ (char*)(output->dst) + output->pos, &sizeWritten,
+ &srcSize, &srcSize, /* use a valid src address instead of NULL */
+ zsf_flush);
+ output->pos += sizeWritten;
+ if (ZSTD_isError(result)) return result;
+ return zcs->outBuffContentSize - zcs->outBuffFlushedSize; /* remaining to flush */
+}
+
+
+size_t ZSTD_endStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output)
+{
+ BYTE* const ostart = (BYTE*)(output->dst) + output->pos;
+ BYTE* const oend = (BYTE*)(output->dst) + output->size;
+ BYTE* op = ostart;
+
+ if (zcs->stage != zcss_final) {
+ /* flush whatever remains */
+ size_t srcSize = 0;
+ size_t sizeWritten = output->size - output->pos;
+ size_t const notEnded = ZSTD_compressStream_generic(zcs, ostart, &sizeWritten, &srcSize, &srcSize, zsf_end); /* use a valid src address instead of NULL */
+ size_t const remainingToFlush = zcs->outBuffContentSize - zcs->outBuffFlushedSize;
+ op += sizeWritten;
+ if (remainingToFlush) {
+ output->pos += sizeWritten;
+ return remainingToFlush + ZSTD_BLOCKHEADERSIZE /* final empty block */ + (zcs->checksum * 4);
+ }
+ /* create epilogue */
+ zcs->stage = zcss_final;
+ zcs->outBuffContentSize = !notEnded ? 0 :
+ ZSTD_compressEnd(zcs->cctx, zcs->outBuff, zcs->outBuffSize, NULL, 0); /* write epilogue, including final empty block, into outBuff */
+ }
+
+ /* flush epilogue */
+ { size_t const toFlush = zcs->outBuffContentSize - zcs->outBuffFlushedSize;
+ size_t const flushed = ZSTD_limitCopy(op, oend-op, zcs->outBuff + zcs->outBuffFlushedSize, toFlush);
+ op += flushed;
+ zcs->outBuffFlushedSize += flushed;
+ output->pos += op-ostart;
+ if (toFlush==flushed) zcs->stage = zcss_init; /* end reached */
+ return toFlush - flushed;
+ }
+}
+
+
+
+/*-===== Pre-defined compression levels =====-*/
+
+#define ZSTD_DEFAULT_CLEVEL 1
+#define ZSTD_MAX_CLEVEL 22
+int ZSTD_maxCLevel(void) { return ZSTD_MAX_CLEVEL; }
+
+static const ZSTD_compressionParameters ZSTD_defaultCParameters[4][ZSTD_MAX_CLEVEL+1] = {
+{ /* "default" */
+ /* W, C, H, S, L, TL, strat */
+ { 18, 12, 12, 1, 7, 16, ZSTD_fast }, /* level 0 - never used */
+ { 19, 13, 14, 1, 7, 16, ZSTD_fast }, /* level 1 */
+ { 19, 15, 16, 1, 6, 16, ZSTD_fast }, /* level 2 */
+ { 20, 16, 17, 1, 5, 16, ZSTD_dfast }, /* level 3.*/
+ { 20, 18, 18, 1, 5, 16, ZSTD_dfast }, /* level 4.*/
+ { 20, 15, 18, 3, 5, 16, ZSTD_greedy }, /* level 5 */
+ { 21, 16, 19, 2, 5, 16, ZSTD_lazy }, /* level 6 */
+ { 21, 17, 20, 3, 5, 16, ZSTD_lazy }, /* level 7 */
+ { 21, 18, 20, 3, 5, 16, ZSTD_lazy2 }, /* level 8 */
+ { 21, 20, 20, 3, 5, 16, ZSTD_lazy2 }, /* level 9 */
+ { 21, 19, 21, 4, 5, 16, ZSTD_lazy2 }, /* level 10 */
+ { 22, 20, 22, 4, 5, 16, ZSTD_lazy2 }, /* level 11 */
+ { 22, 20, 22, 5, 5, 16, ZSTD_lazy2 }, /* level 12 */
+ { 22, 21, 22, 5, 5, 16, ZSTD_lazy2 }, /* level 13 */
+ { 22, 21, 22, 6, 5, 16, ZSTD_lazy2 }, /* level 14 */
+ { 22, 21, 21, 5, 5, 16, ZSTD_btlazy2 }, /* level 15 */
+ { 23, 22, 22, 5, 5, 16, ZSTD_btlazy2 }, /* level 16 */
+ { 23, 21, 22, 4, 5, 24, ZSTD_btopt }, /* level 17 */
+ { 23, 23, 22, 6, 5, 32, ZSTD_btopt }, /* level 18 */
+ { 23, 23, 22, 6, 3, 48, ZSTD_btopt }, /* level 19 */
+ { 25, 25, 23, 7, 3, 64, ZSTD_btopt2 }, /* level 20 */
+ { 26, 26, 23, 7, 3,256, ZSTD_btopt2 }, /* level 21 */
+ { 27, 27, 25, 9, 3,512, ZSTD_btopt2 }, /* level 22 */
+},
+{ /* for srcSize <= 256 KB */
+ /* W, C, H, S, L, T, strat */
+ { 0, 0, 0, 0, 0, 0, ZSTD_fast }, /* level 0 - not used */
+ { 18, 13, 14, 1, 6, 8, ZSTD_fast }, /* level 1 */
+ { 18, 14, 13, 1, 5, 8, ZSTD_dfast }, /* level 2 */
+ { 18, 16, 15, 1, 5, 8, ZSTD_dfast }, /* level 3 */
+ { 18, 15, 17, 1, 5, 8, ZSTD_greedy }, /* level 4.*/
+ { 18, 16, 17, 4, 5, 8, ZSTD_greedy }, /* level 5.*/
+ { 18, 16, 17, 3, 5, 8, ZSTD_lazy }, /* level 6.*/
+ { 18, 17, 17, 4, 4, 8, ZSTD_lazy }, /* level 7 */
+ { 18, 17, 17, 4, 4, 8, ZSTD_lazy2 }, /* level 8 */
+ { 18, 17, 17, 5, 4, 8, ZSTD_lazy2 }, /* level 9 */
+ { 18, 17, 17, 6, 4, 8, ZSTD_lazy2 }, /* level 10 */
+ { 18, 18, 17, 6, 4, 8, ZSTD_lazy2 }, /* level 11.*/
+ { 18, 18, 17, 7, 4, 8, ZSTD_lazy2 }, /* level 12.*/
+ { 18, 19, 17, 6, 4, 8, ZSTD_btlazy2 }, /* level 13 */
+ { 18, 18, 18, 4, 4, 16, ZSTD_btopt }, /* level 14.*/
+ { 18, 18, 18, 4, 3, 16, ZSTD_btopt }, /* level 15.*/
+ { 18, 19, 18, 6, 3, 32, ZSTD_btopt }, /* level 16.*/
+ { 18, 19, 18, 8, 3, 64, ZSTD_btopt }, /* level 17.*/
+ { 18, 19, 18, 9, 3,128, ZSTD_btopt }, /* level 18.*/
+ { 18, 19, 18, 10, 3,256, ZSTD_btopt }, /* level 19.*/
+ { 18, 19, 18, 11, 3,512, ZSTD_btopt2 }, /* level 20.*/
+ { 18, 19, 18, 12, 3,512, ZSTD_btopt2 }, /* level 21.*/
+ { 18, 19, 18, 13, 3,512, ZSTD_btopt2 }, /* level 22.*/
+},
+{ /* for srcSize <= 128 KB */
+ /* W, C, H, S, L, T, strat */
+ { 17, 12, 12, 1, 7, 8, ZSTD_fast }, /* level 0 - not used */
+ { 17, 12, 13, 1, 6, 8, ZSTD_fast }, /* level 1 */
+ { 17, 13, 16, 1, 5, 8, ZSTD_fast }, /* level 2 */
+ { 17, 16, 16, 2, 5, 8, ZSTD_dfast }, /* level 3 */
+ { 17, 13, 15, 3, 4, 8, ZSTD_greedy }, /* level 4 */
+ { 17, 15, 17, 4, 4, 8, ZSTD_greedy }, /* level 5 */
+ { 17, 16, 17, 3, 4, 8, ZSTD_lazy }, /* level 6 */
+ { 17, 15, 17, 4, 4, 8, ZSTD_lazy2 }, /* level 7 */
+ { 17, 17, 17, 4, 4, 8, ZSTD_lazy2 }, /* level 8 */
+ { 17, 17, 17, 5, 4, 8, ZSTD_lazy2 }, /* level 9 */
+ { 17, 17, 17, 6, 4, 8, ZSTD_lazy2 }, /* level 10 */
+ { 17, 17, 17, 7, 4, 8, ZSTD_lazy2 }, /* level 11 */
+ { 17, 17, 17, 8, 4, 8, ZSTD_lazy2 }, /* level 12 */
+ { 17, 18, 17, 6, 4, 8, ZSTD_btlazy2 }, /* level 13.*/
+ { 17, 17, 17, 7, 3, 8, ZSTD_btopt }, /* level 14.*/
+ { 17, 17, 17, 7, 3, 16, ZSTD_btopt }, /* level 15.*/
+ { 17, 18, 17, 7, 3, 32, ZSTD_btopt }, /* level 16.*/
+ { 17, 18, 17, 7, 3, 64, ZSTD_btopt }, /* level 17.*/
+ { 17, 18, 17, 7, 3,256, ZSTD_btopt }, /* level 18.*/
+ { 17, 18, 17, 8, 3,256, ZSTD_btopt }, /* level 19.*/
+ { 17, 18, 17, 9, 3,256, ZSTD_btopt2 }, /* level 20.*/
+ { 17, 18, 17, 10, 3,256, ZSTD_btopt2 }, /* level 21.*/
+ { 17, 18, 17, 11, 3,512, ZSTD_btopt2 }, /* level 22.*/
+},
+{ /* for srcSize <= 16 KB */
+ /* W, C, H, S, L, T, strat */
+ { 14, 12, 12, 1, 7, 6, ZSTD_fast }, /* level 0 - not used */
+ { 14, 14, 14, 1, 6, 6, ZSTD_fast }, /* level 1 */
+ { 14, 14, 14, 1, 4, 6, ZSTD_fast }, /* level 2 */
+ { 14, 14, 14, 1, 4, 6, ZSTD_dfast }, /* level 3.*/
+ { 14, 14, 14, 4, 4, 6, ZSTD_greedy }, /* level 4.*/
+ { 14, 14, 14, 3, 4, 6, ZSTD_lazy }, /* level 5.*/
+ { 14, 14, 14, 4, 4, 6, ZSTD_lazy2 }, /* level 6 */
+ { 14, 14, 14, 5, 4, 6, ZSTD_lazy2 }, /* level 7 */
+ { 14, 14, 14, 6, 4, 6, ZSTD_lazy2 }, /* level 8.*/
+ { 14, 15, 14, 6, 4, 6, ZSTD_btlazy2 }, /* level 9.*/
+ { 14, 15, 14, 3, 3, 6, ZSTD_btopt }, /* level 10.*/
+ { 14, 15, 14, 6, 3, 8, ZSTD_btopt }, /* level 11.*/
+ { 14, 15, 14, 6, 3, 16, ZSTD_btopt }, /* level 12.*/
+ { 14, 15, 14, 6, 3, 24, ZSTD_btopt }, /* level 13.*/
+ { 14, 15, 15, 6, 3, 48, ZSTD_btopt }, /* level 14.*/
+ { 14, 15, 15, 6, 3, 64, ZSTD_btopt }, /* level 15.*/
+ { 14, 15, 15, 6, 3, 96, ZSTD_btopt }, /* level 16.*/
+ { 14, 15, 15, 6, 3,128, ZSTD_btopt }, /* level 17.*/
+ { 14, 15, 15, 6, 3,256, ZSTD_btopt }, /* level 18.*/
+ { 14, 15, 15, 7, 3,256, ZSTD_btopt }, /* level 19.*/
+ { 14, 15, 15, 8, 3,256, ZSTD_btopt2 }, /* level 20.*/
+ { 14, 15, 15, 9, 3,256, ZSTD_btopt2 }, /* level 21.*/
+ { 14, 15, 15, 10, 3,256, ZSTD_btopt2 }, /* level 22.*/
+},
+};
+
+/*! ZSTD_getCParams() :
+* @return ZSTD_compressionParameters structure for a selected compression level, `srcSize` and `dictSize`.
+* Size values are optional, provide 0 if not known or unused */
+ZSTD_compressionParameters ZSTD_getCParams(int compressionLevel, unsigned long long srcSize, size_t dictSize)
+{
+ ZSTD_compressionParameters cp;
+ size_t const addedSize = srcSize ? 0 : 500;
+ U64 const rSize = srcSize+dictSize ? srcSize+dictSize+addedSize : (U64)-1;
+ U32 const tableID = (rSize <= 256 KB) + (rSize <= 128 KB) + (rSize <= 16 KB); /* intentional underflow for srcSizeHint == 0 */
+ if (compressionLevel <= 0) compressionLevel = ZSTD_DEFAULT_CLEVEL; /* 0 == default; no negative compressionLevel yet */
+ if (compressionLevel > ZSTD_MAX_CLEVEL) compressionLevel = ZSTD_MAX_CLEVEL;
+ cp = ZSTD_defaultCParameters[tableID][compressionLevel];
+ if (MEM_32bits()) { /* auto-correction, for 32-bits mode */
+ if (cp.windowLog > ZSTD_WINDOWLOG_MAX) cp.windowLog = ZSTD_WINDOWLOG_MAX;
+ if (cp.chainLog > ZSTD_CHAINLOG_MAX) cp.chainLog = ZSTD_CHAINLOG_MAX;
+ if (cp.hashLog > ZSTD_HASHLOG_MAX) cp.hashLog = ZSTD_HASHLOG_MAX;
+ }
+ cp = ZSTD_adjustCParams(cp, srcSize, dictSize);
+ return cp;
+}
+
+/*! ZSTD_getParams() :
+* same as ZSTD_getCParams(), but @return a `ZSTD_parameters` object (instead of `ZSTD_compressionParameters`).
+* All fields of `ZSTD_frameParameters` are set to default (0) */
+ZSTD_parameters ZSTD_getParams(int compressionLevel, unsigned long long srcSize, size_t dictSize) {
+ ZSTD_parameters params;
+ ZSTD_compressionParameters const cParams = ZSTD_getCParams(compressionLevel, srcSize, dictSize);
+ memset(¶ms, 0, sizeof(params));
+ params.cParams = cParams;
+ return params;
+}