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-rw-r--r--thirdparty/zstd/compress/zstd_compress_internal.h462
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diff --git a/thirdparty/zstd/compress/zstd_compress_internal.h b/thirdparty/zstd/compress/zstd_compress_internal.h
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+++ b/thirdparty/zstd/compress/zstd_compress_internal.h
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+/*
+ * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+
+/* This header contains definitions
+ * that shall **only** be used by modules within lib/compress.
+ */
+
+#ifndef ZSTD_COMPRESS_H
+#define ZSTD_COMPRESS_H
+
+/*-*************************************
+* Dependencies
+***************************************/
+#include "zstd_internal.h"
+#ifdef ZSTD_MULTITHREAD
+# include "zstdmt_compress.h"
+#endif
+
+#if defined (__cplusplus)
+extern "C" {
+#endif
+
+/*-*************************************
+* Constants
+***************************************/
+static const U32 g_searchStrength = 8;
+#define HASH_READ_SIZE 8
+
+
+/*-*************************************
+* Context memory management
+***************************************/
+typedef enum { ZSTDcs_created=0, ZSTDcs_init, ZSTDcs_ongoing, ZSTDcs_ending } ZSTD_compressionStage_e;
+typedef enum { zcss_init=0, zcss_load, zcss_flush } ZSTD_cStreamStage;
+
+typedef struct ZSTD_prefixDict_s {
+ const void* dict;
+ size_t dictSize;
+ ZSTD_dictMode_e dictMode;
+} ZSTD_prefixDict;
+
+typedef struct {
+ U32 hufCTable[HUF_CTABLE_SIZE_U32(255)];
+ 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)];
+ U32 workspace[HUF_WORKSPACE_SIZE_U32];
+ HUF_repeat hufCTable_repeatMode;
+ FSE_repeat offcode_repeatMode;
+ FSE_repeat matchlength_repeatMode;
+ FSE_repeat litlength_repeatMode;
+} ZSTD_entropyCTables_t;
+
+typedef struct {
+ U32 off;
+ U32 len;
+} ZSTD_match_t;
+
+typedef struct {
+ int price;
+ U32 off;
+ U32 mlen;
+ U32 litlen;
+ U32 rep[ZSTD_REP_NUM];
+} ZSTD_optimal_t;
+
+typedef struct {
+ /* All tables are allocated inside cctx->workspace by ZSTD_resetCCtx_internal() */
+ U32* litFreq; /* table of literals statistics, of size 256 */
+ U32* litLengthFreq; /* table of litLength statistics, of size (MaxLL+1) */
+ U32* matchLengthFreq; /* table of matchLength statistics, of size (MaxML+1) */
+ U32* offCodeFreq; /* table of offCode statistics, of size (MaxOff+1) */
+ ZSTD_match_t* matchTable; /* list of found matches, of size ZSTD_OPT_NUM+1 */
+ ZSTD_optimal_t* priceTable; /* All positions tracked by optimal parser, of size ZSTD_OPT_NUM+1 */
+
+ U32 litSum; /* nb of literals */
+ U32 litLengthSum; /* nb of litLength codes */
+ U32 matchLengthSum; /* nb of matchLength codes */
+ U32 offCodeSum; /* nb of offset codes */
+ /* begin updated by ZSTD_setLog2Prices */
+ U32 log2litSum; /* pow2 to compare log2(litfreq) to */
+ U32 log2litLengthSum; /* pow2 to compare log2(llfreq) to */
+ U32 log2matchLengthSum; /* pow2 to compare log2(mlfreq) to */
+ U32 log2offCodeSum; /* pow2 to compare log2(offreq) to */
+ /* end : updated by ZSTD_setLog2Prices */
+ U32 staticPrices; /* prices follow a pre-defined cost structure, statistics are irrelevant */
+} optState_t;
+
+typedef struct {
+ U32 offset;
+ U32 checksum;
+} ldmEntry_t;
+
+typedef struct {
+ ldmEntry_t* hashTable;
+ BYTE* bucketOffsets; /* Next position in bucket to insert entry */
+ U64 hashPower; /* Used to compute the rolling hash.
+ * Depends on ldmParams.minMatchLength */
+} ldmState_t;
+
+typedef struct {
+ U32 enableLdm; /* 1 if enable long distance matching */
+ U32 hashLog; /* Log size of hashTable */
+ U32 bucketSizeLog; /* Log bucket size for collision resolution, at most 8 */
+ U32 minMatchLength; /* Minimum match length */
+ U32 hashEveryLog; /* Log number of entries to skip */
+} ldmParams_t;
+
+struct ZSTD_CCtx_params_s {
+ ZSTD_format_e format;
+ ZSTD_compressionParameters cParams;
+ ZSTD_frameParameters fParams;
+
+ int compressionLevel;
+ U32 forceWindow; /* force back-references to respect limit of
+ * 1<<wLog, even for dictionary */
+
+ /* Multithreading: used to pass parameters to mtctx */
+ U32 nbThreads;
+ unsigned jobSize;
+ unsigned overlapSizeLog;
+
+ /* Long distance matching parameters */
+ ldmParams_t ldmParams;
+
+ /* For use with createCCtxParams() and freeCCtxParams() only */
+ ZSTD_customMem customMem;
+
+}; /* typedef'd to ZSTD_CCtx_params within "zstd.h" */
+
+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; /* index of end of dictionary */
+ ZSTD_compressionStage_e stage;
+ U32 dictID;
+ ZSTD_CCtx_params requestedParams;
+ ZSTD_CCtx_params appliedParams;
+ void* workSpace;
+ size_t workSpaceSize;
+ size_t blockSize;
+ U64 pledgedSrcSizePlusOne; /* this way, 0 (default) == unknown */
+ U64 consumedSrcSize;
+ XXH64_state_t xxhState;
+ ZSTD_customMem customMem;
+ size_t staticSize;
+
+ seqStore_t seqStore; /* sequences storage ptrs */
+ optState_t optState;
+ ldmState_t ldmState; /* long distance matching state */
+ U32* hashTable;
+ U32* hashTable3;
+ U32* chainTable;
+ ZSTD_entropyCTables_t* entropy;
+
+ /* streaming */
+ char* inBuff;
+ size_t inBuffSize;
+ size_t inToCompress;
+ size_t inBuffPos;
+ size_t inBuffTarget;
+ char* outBuff;
+ size_t outBuffSize;
+ size_t outBuffContentSize;
+ size_t outBuffFlushedSize;
+ ZSTD_cStreamStage streamStage;
+ U32 frameEnded;
+
+ /* Dictionary */
+ ZSTD_CDict* cdictLocal;
+ const ZSTD_CDict* cdict;
+ ZSTD_prefixDict prefixDict; /* single-usage dictionary */
+
+ /* Multi-threading */
+#ifdef ZSTD_MULTITHREAD
+ ZSTDMT_CCtx* mtctx;
+#endif
+};
+
+
+MEM_STATIC U32 ZSTD_LLcode(U32 litLength)
+{
+ 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 U32 LL_deltaCode = 19;
+ return (litLength > 63) ? ZSTD_highbit32(litLength) + LL_deltaCode : LL_Code[litLength];
+}
+
+/* ZSTD_MLcode() :
+ * note : mlBase = matchLength - MINMATCH;
+ * because it's the format it's stored in seqStore->sequences */
+MEM_STATIC U32 ZSTD_MLcode(U32 mlBase)
+{
+ 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 };
+ static const U32 ML_deltaCode = 36;
+ return (mlBase > 127) ? ZSTD_highbit32(mlBase) + ML_deltaCode : ML_Code[mlBase];
+}
+
+/*! ZSTD_storeSeq() :
+ * Store a sequence (literal length, literals, offset code and match length code) into seqStore_t.
+ * `offsetCode` : distance to match + 3 (values 1-3 are repCodes).
+ * `mlBase` : matchLength - MINMATCH
+*/
+MEM_STATIC void ZSTD_storeSeq(seqStore_t* seqStorePtr, size_t litLength, const void* literals, U32 offsetCode, size_t mlBase)
+{
+#if defined(ZSTD_DEBUG) && (ZSTD_DEBUG >= 6)
+ static const BYTE* g_start = NULL;
+ if (g_start==NULL) g_start = (const BYTE*)literals; /* note : index only works for compression within a single segment */
+ { U32 const pos = (U32)((const BYTE*)literals - g_start);
+ DEBUGLOG(6, "Cpos%7u :%3u literals, match%3u bytes at dist.code%7u",
+ pos, (U32)litLength, (U32)mlBase+MINMATCH, (U32)offsetCode);
+ }
+#endif
+ /* copy Literals */
+ assert(seqStorePtr->lit + litLength <= seqStorePtr->litStart + 128 KB);
+ ZSTD_wildcopy(seqStorePtr->lit, literals, litLength);
+ seqStorePtr->lit += litLength;
+
+ /* literal Length */
+ if (litLength>0xFFFF) {
+ assert(seqStorePtr->longLengthID == 0); /* there can only be a single long length */
+ 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 (mlBase>0xFFFF) {
+ assert(seqStorePtr->longLengthID == 0); /* there can only be a single long length */
+ seqStorePtr->longLengthID = 2;
+ seqStorePtr->longLengthPos = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
+ }
+ seqStorePtr->sequences[0].matchLength = (U16)mlBase;
+
+ seqStorePtr->sequences++;
+}
+
+
+/*-*************************************
+* Match length counter
+***************************************/
+static unsigned ZSTD_NbCommonBytes (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__ >= 4)
+ 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__ >= 4)
+ 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
+ } }
+}
+
+
+MEM_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);
+
+ if (pIn < pInLoopLimit) {
+ { size_t const diff = MEM_readST(pMatch) ^ MEM_readST(pIn);
+ if (diff) return ZSTD_NbCommonBytes(diff); }
+ pIn+=sizeof(size_t); pMatch+=sizeof(size_t);
+ 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() && (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
+*/
+MEM_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); }
+
+MEM_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);
+ }
+}
+
+#if defined (__cplusplus)
+}
+#endif
+
+
+/* ==============================================================
+ * Private declarations
+ * These prototypes shall only be called from within lib/compress
+ * ============================================================== */
+
+/*! ZSTD_initCStream_internal() :
+ * Private use only. Init streaming operation.
+ * expects params to be valid.
+ * must receive dict, or cdict, or none, but not both.
+ * @return : 0, or an error code */
+size_t ZSTD_initCStream_internal(ZSTD_CStream* zcs,
+ const void* dict, size_t dictSize,
+ const ZSTD_CDict* cdict,
+ ZSTD_CCtx_params params, unsigned long long pledgedSrcSize);
+
+/*! ZSTD_compressStream_generic() :
+ * Private use only. To be called from zstdmt_compress.c in single-thread mode. */
+size_t ZSTD_compressStream_generic(ZSTD_CStream* zcs,
+ ZSTD_outBuffer* output,
+ ZSTD_inBuffer* input,
+ ZSTD_EndDirective const flushMode);
+
+/*! ZSTD_getCParamsFromCDict() :
+ * as the name implies */
+ZSTD_compressionParameters ZSTD_getCParamsFromCDict(const ZSTD_CDict* cdict);
+
+/* ZSTD_compressBegin_advanced_internal() :
+ * Private use only. To be called from zstdmt_compress.c. */
+size_t ZSTD_compressBegin_advanced_internal(ZSTD_CCtx* cctx,
+ const void* dict, size_t dictSize,
+ ZSTD_dictMode_e dictMode,
+ const ZSTD_CDict* cdict,
+ ZSTD_CCtx_params params,
+ unsigned long long pledgedSrcSize);
+
+/* ZSTD_compress_advanced_internal() :
+ * Private use only. To be called from zstdmt_compress.c. */
+size_t ZSTD_compress_advanced_internal(ZSTD_CCtx* cctx,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize,
+ const void* dict,size_t dictSize,
+ ZSTD_CCtx_params params);
+
+#endif /* ZSTD_COMPRESS_H */
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