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/**
* 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 https://github.com/facebook/zstd.
* An additional grant of patent rights can be found in the PATENTS file in the
* same directory.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License version 2 as published by the
* Free Software Foundation. This program is dual-licensed; you may select
* either version 2 of the GNU General Public License ("GPL") or BSD license
* ("BSD").
*/
#ifndef ZSTD_CCOMMON_H_MODULE
#define ZSTD_CCOMMON_H_MODULE
/*-*******************************************************
* Compiler specifics
*********************************************************/
#define FORCE_INLINE static __always_inline
#define FORCE_NOINLINE static noinline
/*-*************************************
* Dependencies
***************************************/
#include "error_private.h"
#include "mem.h"
#include <linux/compiler.h>
#include <linux/kernel.h>
#include <linux/xxhash.h>
#include <linux/zstd.h>
/*-*************************************
* shared macros
***************************************/
#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 */
#define ZSTD_STATIC_ASSERT(c) \
{ \
enum { ZSTD_static_assert = 1 / (int)(!!(c)) }; \
}
/*-*************************************
* 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 EQUAL_READ32 4
#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
*********************************************/
ZSTD_STATIC void ZSTD_copy8(void *dst, const void *src) {
/*
* zstd relies heavily on gcc being able to analyze and inline this
* memcpy() call, since it is called in a tight loop. Preboot mode
* is compiled in freestanding mode, which stops gcc from analyzing
* memcpy(). Use __builtin_memcpy() to tell gcc to analyze this as a
* regular memcpy().
*/
__builtin_memcpy(dst, src, 8);
}
/*! ZSTD_wildcopy() :
* custom version of memcpy(), can copy up to 7 bytes too many (8 bytes if length==0) */
#define WILDCOPY_OVERLENGTH 8
ZSTD_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;
#if defined(GCC_VERSION) && GCC_VERSION >= 70000 && GCC_VERSION < 70200
/*
* Work around https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81388.
* Avoid the bad case where the loop only runs once by handling the
* special case separately. This doesn't trigger the bug because it
* doesn't involve pointer/integer overflow.
*/
if (length <= 8)
return ZSTD_copy8(dst, src);
#endif
do {
ZSTD_copy8(op, ip);
op += 8;
ip += 8;
} 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 */
typedef void *(*ZSTD_allocFunction)(void *opaque, size_t size);
typedef void (*ZSTD_freeFunction)(void *opaque, void *address);
typedef struct {
ZSTD_allocFunction customAlloc;
ZSTD_freeFunction customFree;
void *opaque;
} ZSTD_customMem;
void *ZSTD_malloc(size_t size, ZSTD_customMem customMem);
void ZSTD_free(void *ptr, ZSTD_customMem customMem);
/*====== stack allocation ======*/
typedef struct {
void *ptr;
const void *end;
} ZSTD_stack;
#define ZSTD_ALIGN(x) ALIGN(x, sizeof(size_t))
#define ZSTD_PTR_ALIGN(p) PTR_ALIGN(p, sizeof(size_t))
ZSTD_customMem ZSTD_initStack(void *workspace, size_t workspaceSize);
void *ZSTD_stackAllocAll(void *opaque, size_t *size);
void *ZSTD_stackAlloc(void *opaque, size_t size);
void ZSTD_stackFree(void *opaque, void *address);
/*====== common function ======*/
ZSTD_STATIC U32 ZSTD_highbit32(U32 val) { return 31 - __builtin_clz(val); }
/* 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);
size_t ZSTD_freeCCtx(ZSTD_CCtx *cctx);
size_t ZSTD_freeDCtx(ZSTD_DCtx *dctx);
size_t ZSTD_freeCDict(ZSTD_CDict *cdict);
size_t ZSTD_freeDDict(ZSTD_DDict *cdict);
size_t ZSTD_freeCStream(ZSTD_CStream *zcs);
size_t ZSTD_freeDStream(ZSTD_DStream *zds);
#endif /* ZSTD_CCOMMON_H_MODULE */
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