256 lines
8.5 KiB
C
256 lines
8.5 KiB
C
/*
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zstd_internal - common functions to include
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Header File for include
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Copyright (C) 2014-2016, Yann Collet.
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BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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You can contact the author at :
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- zstd homepage : https://www.zstd.net
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*/
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#ifndef ZSTD_CCOMMON_H_MODULE
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#define ZSTD_CCOMMON_H_MODULE
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/*-*************************************
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* Dependencies
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***************************************/
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#include "mem.h"
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#include "error_private.h"
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#include "zstd_static.h"
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/*-*************************************
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* Common macros
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***************************************/
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#define MIN(a,b) ((a)<(b) ? (a) : (b))
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#define MAX(a,b) ((a)>(b) ? (a) : (b))
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/*-*************************************
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* Common constants
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***************************************/
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#define ZSTD_OPT_DEBUG 0 // 3 = compression stats; 5 = check encoded sequences; 9 = full logs
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#include <stdio.h>
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#if defined(ZSTD_OPT_DEBUG) && ZSTD_OPT_DEBUG>=9
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#define ZSTD_LOG_PARSER(...) printf(__VA_ARGS__)
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#define ZSTD_LOG_ENCODE(...) printf(__VA_ARGS__)
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#define ZSTD_LOG_BLOCK(...) printf(__VA_ARGS__)
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#else
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#define ZSTD_LOG_PARSER(...)
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#define ZSTD_LOG_ENCODE(...)
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#define ZSTD_LOG_BLOCK(...)
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#endif
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#define ZSTD_OPT_NUM (1<<12)
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#define ZSTD_DICT_MAGIC 0xEC30A436
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#define ZSTD_REP_NUM 3
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#define ZSTD_REP_INIT ZSTD_REP_NUM
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#define ZSTD_REP_MOVE (ZSTD_REP_NUM-1)
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#define KB *(1 <<10)
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#define MB *(1 <<20)
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#define GB *(1U<<30)
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#define BIT7 128
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#define BIT6 64
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#define BIT5 32
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#define BIT4 16
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#define BIT1 2
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#define BIT0 1
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#define ZSTD_WINDOWLOG_ABSOLUTEMIN 12
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static const size_t ZSTD_fcs_fieldSize[4] = { 0, 1, 2, 8 };
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#define ZSTD_BLOCKHEADERSIZE 3 /* because C standard does not allow a static const value to be defined using another static const value .... :( */
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static const size_t ZSTD_blockHeaderSize = ZSTD_BLOCKHEADERSIZE;
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typedef enum { bt_compressed, bt_raw, bt_rle, bt_end } blockType_t;
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#define MIN_SEQUENCES_SIZE 1 /* nbSeq==0 */
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#define MIN_CBLOCK_SIZE (1 /*litCSize*/ + 1 /* RLE or RAW */ + MIN_SEQUENCES_SIZE /* nbSeq==0 */) /* for a non-null block */
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#define HufLog 12
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#define IS_HUF 0
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#define IS_PCH 1
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#define IS_RAW 2
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#define IS_RLE 3
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#define LONGNBSEQ 0x7F00
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#define MINMATCH 3
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#define EQUAL_READ32 4
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#define REPCODE_STARTVALUE 1
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#define Litbits 8
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#define MaxLit ((1<<Litbits) - 1)
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#define MaxML 52
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#define MaxLL 35
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#define MaxOff 28
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#define MaxSeq MAX(MaxLL, MaxML) /* Assumption : MaxOff < MaxLL,MaxML */
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#define MLFSELog 9
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#define LLFSELog 9
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#define OffFSELog 8
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#define FSE_ENCODING_RAW 0
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#define FSE_ENCODING_RLE 1
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#define FSE_ENCODING_STATIC 2
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#define FSE_ENCODING_DYNAMIC 3
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static const U32 LL_bits[MaxLL+1] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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1, 1, 1, 1, 2, 2, 3, 3, 4, 6, 7, 8, 9,10,11,12,
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13,14,15,16 };
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static const S16 LL_defaultNorm[MaxLL+1] = { 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 1, 1, 1, 1, 1,
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-1,-1,-1,-1 };
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static const U32 LL_defaultNormLog = 6;
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static const U32 ML_bits[MaxML+1] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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1, 1, 1, 1, 2, 2, 3, 3, 4, 4, 5, 7, 8, 9,10,11,
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12,13,14,15,16 };
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static const S16 ML_defaultNorm[MaxML+1] = { 1, 4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,-1,-1,
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-1,-1,-1,-1,-1 };
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static const U32 ML_defaultNormLog = 6;
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static const S16 OF_defaultNorm[MaxOff+1] = { 1, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,-1,-1,-1,-1,-1 };
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static const U32 OF_defaultNormLog = 5;
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/*-*******************************************
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* Shared functions to include for inlining
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*********************************************/
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static void ZSTD_copy8(void* dst, const void* src) { memcpy(dst, src, 8); }
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#define COPY8(d,s) { ZSTD_copy8(d,s); d+=8; s+=8; }
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/*! ZSTD_wildcopy() :
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* custom version of memcpy(), can copy up to 7 bytes too many (8 bytes if length==0) */
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#define WILDCOPY_OVERLENGTH 8
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MEM_STATIC void ZSTD_wildcopy(void* dst, const void* src, size_t length)
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{
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const BYTE* ip = (const BYTE*)src;
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BYTE* op = (BYTE*)dst;
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BYTE* const oend = op + length;
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do
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COPY8(op, ip)
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while (op < oend);
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}
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MEM_STATIC unsigned ZSTD_highbit(U32 val)
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{
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# if defined(_MSC_VER) /* Visual */
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unsigned long r=0;
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_BitScanReverse(&r, val);
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return (unsigned)r;
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# elif defined(__GNUC__) && (__GNUC__ >= 3) /* GCC Intrinsic */
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return 31 - __builtin_clz(val);
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# else /* Software version */
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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 };
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U32 v = val;
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int r;
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v |= v >> 1;
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v |= v >> 2;
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v |= v >> 4;
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v |= v >> 8;
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v |= v >> 16;
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r = DeBruijnClz[(U32)(v * 0x07C4ACDDU) >> 27];
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return r;
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# endif
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}
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/*-*******************************************
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* Private interfaces
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*********************************************/
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typedef struct {
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U32 off;
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U32 len;
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} ZSTD_match_t;
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typedef struct {
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U32 price;
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U32 off;
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U32 mlen;
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U32 litlen;
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U32 rep[ZSTD_REP_INIT];
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} ZSTD_optimal_t;
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#if ZSTD_OPT_DEBUG == 3
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#include ".debug/zstd_stats.h"
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#else
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typedef struct { U32 unused; } ZSTD_stats_t;
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MEM_STATIC void ZSTD_statsPrint(ZSTD_stats_t* stats, U32 searchLength) { (void)stats; (void)searchLength; }
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MEM_STATIC void ZSTD_statsInit(ZSTD_stats_t* stats) { (void)stats; }
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MEM_STATIC void ZSTD_statsResetFreqs(ZSTD_stats_t* stats) { (void)stats; }
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MEM_STATIC void ZSTD_statsUpdatePrices(ZSTD_stats_t* stats, size_t litLength, const BYTE* literals, size_t offset, size_t matchLength) { (void)stats; (void)litLength; (void)literals; (void)offset; (void)matchLength; }
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#endif
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typedef struct {
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void* buffer;
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U32* offsetStart;
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U32* offset;
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BYTE* offCodeStart;
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BYTE* litStart;
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BYTE* lit;
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U16* litLengthStart;
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U16* litLength;
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BYTE* llCodeStart;
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U16* matchLengthStart;
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U16* matchLength;
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BYTE* mlCodeStart;
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U32 longLengthID; /* 0 == no longLength; 1 == Lit.longLength; 2 == Match.longLength; */
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U32 longLengthPos;
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/* opt */
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ZSTD_optimal_t* priceTable;
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ZSTD_match_t* matchTable;
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U32* matchLengthFreq;
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U32* litLengthFreq;
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U32* litFreq;
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U32* offCodeFreq;
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U32 matchLengthSum;
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U32 matchSum;
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U32 litLengthSum;
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U32 litSum;
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U32 offCodeSum;
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U32 log2matchLengthSum;
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U32 log2matchSum;
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U32 log2litLengthSum;
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U32 log2litSum;
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U32 log2offCodeSum;
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U32 factor;
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U32 cachedPrice;
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U32 cachedLitLength;
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const BYTE* cachedLiterals;
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ZSTD_stats_t stats;
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} seqStore_t;
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const seqStore_t* ZSTD_getSeqStore(const ZSTD_CCtx* ctx);
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void ZSTD_seqToCodes(const seqStore_t* seqStorePtr, size_t const nbSeq);
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#endif /* ZSTD_CCOMMON_H_MODULE */
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