c3ab9eb590
It is now dual-licensed BSD-3-Clause and GPL-2.0, we use the former. The PATENTS file is no longer applicable \o/ Also add zstd to COPYRIGHT.txt
335 lines
11 KiB
C++
335 lines
11 KiB
C++
/*
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* Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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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 "compiler.h"
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#include "mem.h"
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#include "error_private.h"
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#define ZSTD_STATIC_LINKING_ONLY
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#include "zstd.h"
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#define FSE_STATIC_LINKING_ONLY
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#include "fse.h"
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#define HUF_STATIC_LINKING_ONLY
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#include "huf.h"
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#ifndef XXH_STATIC_LINKING_ONLY
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# define XXH_STATIC_LINKING_ONLY /* XXH64_state_t */
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#endif
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#include "xxhash.h" /* XXH_reset, update, digest */
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/*-*************************************
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* Debug
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***************************************/
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#if defined(ZSTD_DEBUG) && (ZSTD_DEBUG>=1)
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# include <assert.h>
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#else
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# ifndef assert
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# define assert(condition) ((void)0)
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# endif
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#endif
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#define ZSTD_STATIC_ASSERT(c) { enum { ZSTD_static_assert = 1/(int)(!!(c)) }; }
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#if defined(ZSTD_DEBUG) && (ZSTD_DEBUG>=2)
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# include <stdio.h>
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/* recommended values for ZSTD_DEBUG display levels :
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* 1 : no display, enables assert() only
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* 2 : reserved for currently active debugging path
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* 3 : events once per object lifetime (CCtx, CDict)
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* 4 : events once per frame
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* 5 : events once per block
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* 6 : events once per sequence (*very* verbose) */
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# define DEBUGLOG(l, ...) { \
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if (l<=ZSTD_DEBUG) { \
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fprintf(stderr, __FILE__ ": "); \
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fprintf(stderr, __VA_ARGS__); \
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fprintf(stderr, " \n"); \
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} }
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#else
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# define DEBUGLOG(l, ...) {} /* disabled */
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#endif
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/*-*************************************
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* shared macros
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***************************************/
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#undef MIN
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#undef MAX
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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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#define CHECK_F(f) { size_t const errcod = f; if (ERR_isError(errcod)) return errcod; } /* check and Forward error code */
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#define CHECK_E(f, e) { size_t const errcod = f; if (ERR_isError(errcod)) return ERROR(e); } /* check and send Error code */
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/*-*************************************
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* Common constants
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***************************************/
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#define ZSTD_OPT_NUM (1<<12)
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#define ZSTD_REP_NUM 3 /* number of repcodes */
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#define ZSTD_REP_CHECK (ZSTD_REP_NUM) /* number of repcodes to check by the optimal parser */
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#define ZSTD_REP_MOVE (ZSTD_REP_NUM-1)
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#define ZSTD_REP_MOVE_OPT (ZSTD_REP_NUM)
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static const U32 repStartValue[ZSTD_REP_NUM] = { 1, 4, 8 };
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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 10
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static const size_t ZSTD_fcs_fieldSize[4] = { 0, 2, 4, 8 };
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static const size_t ZSTD_did_fieldSize[4] = { 0, 1, 2, 4 };
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#define ZSTD_BLOCKHEADERSIZE 3 /* C standard doesn't allow `static const` variable to be init using another `static const` variable */
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static const size_t ZSTD_blockHeaderSize = ZSTD_BLOCKHEADERSIZE;
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typedef enum { bt_raw, bt_rle, bt_compressed, bt_reserved } blockType_e;
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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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typedef enum { set_basic, set_rle, set_compressed, set_repeat } symbolEncodingType_e;
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#define LONGNBSEQ 0x7F00
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#define MINMATCH 3
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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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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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#define LL_DEFAULTNORMLOG 6 /* for static allocation */
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static const U32 LL_defaultNormLog = LL_DEFAULTNORMLOG;
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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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#define ML_DEFAULTNORMLOG 6 /* for static allocation */
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static const U32 ML_defaultNormLog = ML_DEFAULTNORMLOG;
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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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#define OF_DEFAULTNORMLOG 5 /* for static allocation */
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static const U32 OF_defaultNormLog = OF_DEFAULTNORMLOG;
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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, ptrdiff_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 void ZSTD_wildcopy_e(void* dst, const void* src, void* dstEnd) /* should be faster for decoding, but strangely, not verified on all platform */
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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 = (BYTE*)dstEnd;
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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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/*-*******************************************
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* Private interfaces
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*********************************************/
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typedef struct ZSTD_stats_s ZSTD_stats_t;
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typedef struct seqDef_s {
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U32 offset;
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U16 litLength;
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U16 matchLength;
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} seqDef;
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typedef struct {
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seqDef* sequencesStart;
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seqDef* sequences;
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BYTE* litStart;
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BYTE* lit;
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BYTE* llCode;
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BYTE* mlCode;
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BYTE* ofCode;
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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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U32 rep[ZSTD_REP_NUM];
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U32 repToConfirm[ZSTD_REP_NUM];
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} seqStore_t;
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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_NUM];
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} ZSTD_optimal_t;
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typedef struct {
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U32* litFreq;
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U32* litLengthFreq;
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U32* matchLengthFreq;
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U32* offCodeFreq;
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ZSTD_match_t* matchTable;
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ZSTD_optimal_t* priceTable;
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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 staticPrices;
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U32 cachedPrice;
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U32 cachedLitLength;
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const BYTE* cachedLiterals;
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} optState_t;
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typedef struct {
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U32 hufCTable[HUF_CTABLE_SIZE_U32(255)];
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FSE_CTable offcodeCTable[FSE_CTABLE_SIZE_U32(OffFSELog, MaxOff)];
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FSE_CTable matchlengthCTable[FSE_CTABLE_SIZE_U32(MLFSELog, MaxML)];
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FSE_CTable litlengthCTable[FSE_CTABLE_SIZE_U32(LLFSELog, MaxLL)];
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U32 workspace[HUF_WORKSPACE_SIZE_U32];
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HUF_repeat hufCTable_repeatMode;
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FSE_repeat offcode_repeatMode;
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FSE_repeat matchlength_repeatMode;
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FSE_repeat litlength_repeatMode;
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} ZSTD_entropyCTables_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);
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/* custom memory allocation functions */
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void* ZSTD_malloc(size_t size, ZSTD_customMem customMem);
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void* ZSTD_calloc(size_t size, ZSTD_customMem customMem);
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void ZSTD_free(void* ptr, ZSTD_customMem customMem);
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/*====== common function ======*/
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MEM_STATIC U32 ZSTD_highbit32(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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/* hidden functions */
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/* ZSTD_invalidateRepCodes() :
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* ensures next compression will not use repcodes from previous block.
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* Note : only works with regular variant;
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* do not use with extDict variant ! */
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void ZSTD_invalidateRepCodes(ZSTD_CCtx* cctx);
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/*! ZSTD_initCStream_internal() :
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* Private use only. Init streaming operation.
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* expects params to be valid.
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* must receive dict, or cdict, or none, but not both.
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* @return : 0, or an error code */
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size_t ZSTD_initCStream_internal(ZSTD_CStream* zcs,
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const void* dict, size_t dictSize,
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const ZSTD_CDict* cdict,
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ZSTD_parameters params, unsigned long long pledgedSrcSize);
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/*! ZSTD_compressStream_generic() :
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* Private use only. To be called from zstdmt_compress.c in single-thread mode. */
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size_t ZSTD_compressStream_generic(ZSTD_CStream* zcs,
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ZSTD_outBuffer* output,
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ZSTD_inBuffer* input,
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ZSTD_EndDirective const flushMode);
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/*! ZSTD_getParamsFromCDict() :
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* as the name implies */
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ZSTD_parameters ZSTD_getParamsFromCDict(const ZSTD_CDict* cdict);
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typedef struct {
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blockType_e blockType;
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U32 lastBlock;
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U32 origSize;
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} blockProperties_t;
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/*! ZSTD_getcBlockSize() :
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* Provides the size of compressed block from block header `src` */
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size_t ZSTD_getcBlockSize(const void* src, size_t srcSize,
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blockProperties_t* bpPtr);
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#endif /* ZSTD_CCOMMON_H_MODULE */
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