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Diffstat (limited to 'thirdparty/zstd/common/zstd_internal.h')
| -rw-r--r-- | thirdparty/zstd/common/zstd_internal.h | 284 |
1 files changed, 284 insertions, 0 deletions
diff --git a/thirdparty/zstd/common/zstd_internal.h b/thirdparty/zstd/common/zstd_internal.h new file mode 100644 index 0000000000..2533333ba8 --- /dev/null +++ b/thirdparty/zstd/common/zstd_internal.h @@ -0,0 +1,284 @@ +/** + * 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. + */ + +#ifndef ZSTD_CCOMMON_H_MODULE +#define ZSTD_CCOMMON_H_MODULE + +/*-******************************************************* +* Compiler specifics +*********************************************************/ +#ifdef _MSC_VER /* Visual Studio */ +# define FORCE_INLINE static __forceinline +# include <intrin.h> /* For Visual 2005 */ +# pragma warning(disable : 4100) /* disable: C4100: unreferenced formal parameter */ +# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ +# pragma warning(disable : 4324) /* disable: C4324: padded structure */ +#else +# if defined (__cplusplus) || defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L /* C99 */ +# ifdef __GNUC__ +# define FORCE_INLINE static inline __attribute__((always_inline)) +# else +# define FORCE_INLINE static inline +# endif +# else +# define FORCE_INLINE static +# endif /* __STDC_VERSION__ */ +#endif + +#ifdef _MSC_VER +# define FORCE_NOINLINE static __declspec(noinline) +#else +# ifdef __GNUC__ +# define FORCE_NOINLINE static __attribute__((__noinline__)) +# else +# define FORCE_NOINLINE static +# endif +#endif + + +/*-************************************* +* Dependencies +***************************************/ +#include "mem.h" +#include "error_private.h" +#define ZSTD_STATIC_LINKING_ONLY +#include "zstd.h" +#ifndef XXH_STATIC_LINKING_ONLY +# define XXH_STATIC_LINKING_ONLY /* XXH64_state_t */ +#endif +#include "xxhash.h" /* XXH_reset, update, digest */ + + +/*-************************************* +* shared macros +***************************************/ +#undef MIN +#undef MAX +#define MIN(a,b) ((a)<(b) ? (a) : (b)) +#define MAX(a,b) ((a)>(b) ? (a) : (b)) +#define CHECK_F(f) { size_t const errcod = f; if (ERR_isError(errcod)) return errcod; } /* check and Forward error code */ +#define CHECK_E(f, e) { size_t const errcod = f; if (ERR_isError(errcod)) return ERROR(e); } /* check and send Error code */ + + +/*-************************************* +* Common constants +***************************************/ +#define ZSTD_OPT_NUM (1<<12) +#define ZSTD_DICT_MAGIC 0xEC30A437 /* v0.7+ */ + +#define ZSTD_REP_NUM 3 /* number of repcodes */ +#define ZSTD_REP_CHECK (ZSTD_REP_NUM) /* number of repcodes to check by the optimal parser */ +#define ZSTD_REP_MOVE (ZSTD_REP_NUM-1) +#define ZSTD_REP_MOVE_OPT (ZSTD_REP_NUM) +static const U32 repStartValue[ZSTD_REP_NUM] = { 1, 4, 8 }; + +#define KB *(1 <<10) +#define MB *(1 <<20) +#define GB *(1U<<30) + +#define BIT7 128 +#define BIT6 64 +#define BIT5 32 +#define BIT4 16 +#define BIT1 2 +#define BIT0 1 + +#define ZSTD_WINDOWLOG_ABSOLUTEMIN 10 +static const size_t ZSTD_fcs_fieldSize[4] = { 0, 2, 4, 8 }; +static const size_t ZSTD_did_fieldSize[4] = { 0, 1, 2, 4 }; + +#define ZSTD_BLOCKHEADERSIZE 3 /* C standard doesn't allow `static const` variable to be init using another `static const` variable */ +static const size_t ZSTD_blockHeaderSize = ZSTD_BLOCKHEADERSIZE; +typedef enum { bt_raw, bt_rle, bt_compressed, bt_reserved } blockType_e; + +#define MIN_SEQUENCES_SIZE 1 /* nbSeq==0 */ +#define MIN_CBLOCK_SIZE (1 /*litCSize*/ + 1 /* RLE or RAW */ + MIN_SEQUENCES_SIZE /* nbSeq==0 */) /* for a non-null block */ + +#define HufLog 12 +typedef enum { set_basic, set_rle, set_compressed, set_repeat } symbolEncodingType_e; + +#define LONGNBSEQ 0x7F00 + +#define MINMATCH 3 + +#define Litbits 8 +#define MaxLit ((1<<Litbits) - 1) +#define MaxML 52 +#define MaxLL 35 +#define MaxOff 28 +#define MaxSeq MAX(MaxLL, MaxML) /* Assumption : MaxOff < MaxLL,MaxML */ +#define MLFSELog 9 +#define LLFSELog 9 +#define OffFSELog 8 + +static const U32 LL_bits[MaxLL+1] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 1, 1, 1, 1, 2, 2, 3, 3, 4, 6, 7, 8, 9,10,11,12, + 13,14,15,16 }; +static const S16 LL_defaultNorm[MaxLL+1] = { 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, + 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 1, 1, 1, 1, 1, + -1,-1,-1,-1 }; +#define LL_DEFAULTNORMLOG 6 /* for static allocation */ +static const U32 LL_defaultNormLog = LL_DEFAULTNORMLOG; + +static const U32 ML_bits[MaxML+1] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 1, 1, 1, 1, 2, 2, 3, 3, 4, 4, 5, 7, 8, 9,10,11, + 12,13,14,15,16 }; +static const S16 ML_defaultNorm[MaxML+1] = { 1, 4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,-1,-1, + -1,-1,-1,-1,-1 }; +#define ML_DEFAULTNORMLOG 6 /* for static allocation */ +static const U32 ML_defaultNormLog = ML_DEFAULTNORMLOG; + +static const S16 OF_defaultNorm[MaxOff+1] = { 1, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1,-1,-1,-1,-1,-1 }; +#define OF_DEFAULTNORMLOG 5 /* for static allocation */ +static const U32 OF_defaultNormLog = OF_DEFAULTNORMLOG; + + +/*-******************************************* +* Shared functions to include for inlining +*********************************************/ +static void ZSTD_copy8(void* dst, const void* src) { memcpy(dst, src, 8); } +#define COPY8(d,s) { ZSTD_copy8(d,s); d+=8; s+=8; } + +/*! ZSTD_wildcopy() : +* custom version of memcpy(), can copy up to 7 bytes too many (8 bytes if length==0) */ +#define WILDCOPY_OVERLENGTH 8 +MEM_STATIC void ZSTD_wildcopy(void* dst, const void* src, ptrdiff_t length) +{ + const BYTE* ip = (const BYTE*)src; + BYTE* op = (BYTE*)dst; + BYTE* const oend = op + length; + do + COPY8(op, ip) + while (op < oend); +} + +MEM_STATIC void ZSTD_wildcopy_e(void* dst, const void* src, void* dstEnd) /* should be faster for decoding, but strangely, not verified on all platform */ +{ + const BYTE* ip = (const BYTE*)src; + BYTE* op = (BYTE*)dst; + BYTE* const oend = (BYTE*)dstEnd; + do + COPY8(op, ip) + while (op < oend); +} + + +/*-******************************************* +* Private interfaces +*********************************************/ +typedef struct ZSTD_stats_s ZSTD_stats_t; + +typedef struct { + U32 off; + U32 len; +} ZSTD_match_t; + +typedef struct { + U32 price; + U32 off; + U32 mlen; + U32 litlen; + U32 rep[ZSTD_REP_NUM]; +} ZSTD_optimal_t; + + +typedef struct seqDef_s { + U32 offset; + U16 litLength; + U16 matchLength; +} seqDef; + + +typedef struct { + seqDef* sequencesStart; + seqDef* sequences; + BYTE* litStart; + BYTE* lit; + BYTE* llCode; + BYTE* mlCode; + BYTE* ofCode; + U32 longLengthID; /* 0 == no longLength; 1 == Lit.longLength; 2 == Match.longLength; */ + U32 longLengthPos; + /* opt */ + ZSTD_optimal_t* priceTable; + ZSTD_match_t* matchTable; + U32* matchLengthFreq; + U32* litLengthFreq; + U32* litFreq; + U32* offCodeFreq; + U32 matchLengthSum; + U32 matchSum; + U32 litLengthSum; + U32 litSum; + U32 offCodeSum; + U32 log2matchLengthSum; + U32 log2matchSum; + U32 log2litLengthSum; + U32 log2litSum; + U32 log2offCodeSum; + U32 factor; + U32 staticPrices; + U32 cachedPrice; + U32 cachedLitLength; + const BYTE* cachedLiterals; +} seqStore_t; + +const seqStore_t* ZSTD_getSeqStore(const ZSTD_CCtx* ctx); +void ZSTD_seqToCodes(const seqStore_t* seqStorePtr); +int ZSTD_isSkipFrame(ZSTD_DCtx* dctx); + +/* custom memory allocation functions */ +void* ZSTD_defaultAllocFunction(void* opaque, size_t size); +void ZSTD_defaultFreeFunction(void* opaque, void* address); +#ifndef ZSTD_DLL_IMPORT +static const ZSTD_customMem defaultCustomMem = { ZSTD_defaultAllocFunction, ZSTD_defaultFreeFunction, NULL }; +#endif +void* ZSTD_malloc(size_t size, ZSTD_customMem customMem); +void ZSTD_free(void* ptr, ZSTD_customMem customMem); + + +/*====== common function ======*/ + +MEM_STATIC U32 ZSTD_highbit32(U32 val) +{ +# if defined(_MSC_VER) /* Visual */ + unsigned long r=0; + _BitScanReverse(&r, val); + return (unsigned)r; +# elif defined(__GNUC__) && (__GNUC__ >= 3) /* GCC Intrinsic */ + return 31 - __builtin_clz(val); +# else /* Software version */ + static const int DeBruijnClz[32] = { 0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30, 8, 12, 20, 28, 15, 17, 24, 7, 19, 27, 23, 6, 26, 5, 4, 31 }; + U32 v = val; + int r; + v |= v >> 1; + v |= v >> 2; + v |= v >> 4; + v |= v >> 8; + v |= v >> 16; + r = DeBruijnClz[(U32)(v * 0x07C4ACDDU) >> 27]; + return r; +# endif +} + + +/* hidden functions */ + +/* ZSTD_invalidateRepCodes() : + * ensures next compression will not use repcodes from previous block. + * Note : only works with regular variant; + * do not use with extDict variant ! */ +void ZSTD_invalidateRepCodes(ZSTD_CCtx* cctx); + + +#endif /* ZSTD_CCOMMON_H_MODULE */ |