| /** |
| * 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 : 4204) /* disable: C4204: non-constant aggregate initializer */ |
| # 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 */ |
| |
| |
| /*-************************************* |
| * Debug |
| ***************************************/ |
| #if defined(ZSTD_DEBUG) && (ZSTD_DEBUG>=1) |
| # include <assert.h> |
| #else |
| # ifndef assert |
| # define assert(condition) ((void)0) |
| # endif |
| #endif |
| |
| #define ZSTD_STATIC_ASSERT(c) { enum { ZSTD_static_assert = 1/(int)(!!(c)) }; } |
| |
| #if defined(ZSTD_DEBUG) && (ZSTD_DEBUG>=2) |
| # include <stdio.h> |
| static unsigned g_debugLevel = ZSTD_DEBUG; |
| # define DEBUGLOG(l, ...) { \ |
| if (l<=g_debugLevel) { \ |
| fprintf(stderr, __FILE__ ": "); \ |
| fprintf(stderr, __VA_ARGS__); \ |
| fprintf(stderr, " \n"); \ |
| } } |
| #else |
| # define DEBUGLOG(l, ...) {} /* disabled */ |
| #endif |
| |
| |
| /*-************************************* |
| * 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); |
| |
| /* custom memory allocation functions */ |
| void* ZSTD_malloc(size_t size, ZSTD_customMem customMem); |
| void* ZSTD_calloc(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); |
| |
| |
| typedef enum { ZSTDb_not_buffered, ZSTDb_buffered } ZSTD_buffered_policy_e; |
| #if 0 |
| /*! ZSTD_compressBegin_internal() : |
| * innermost initialization function. Private use only. |
| * expects params to be valid. |
| * must receive dict, or cdict, or none, but not both. |
| * @return : 0, or an error code */ |
| size_t ZSTD_compressBegin_internal(ZSTD_CCtx* cctx, |
| const void* dict, size_t dictSize, |
| const ZSTD_CDict* cdict, |
| ZSTD_parameters params, U64 pledgedSrcSize, |
| ZSTD_buffered_policy_e zbuff); |
| #endif |
| |
| /*! 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_parameters params, unsigned long long pledgedSrcSize); |
| |
| |
| /*! ZSTD_getParamsFromCDict() : |
| * as the name implies */ |
| ZSTD_parameters ZSTD_getParamsFromCDict(const ZSTD_CDict* cdict); |
| |
| |
| #endif /* ZSTD_CCOMMON_H_MODULE */ |