mirror of
https://git.proxmox.com/git/mirror_zfs
synced 2025-10-31 13:29:32 +00:00
fe2ea67ddd
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Rich Ercolani <rincebrain@gmail.com> Closes #12978
447 lines
15 KiB
C
447 lines
15 KiB
C
/*
|
|
* Copyright (c) 2016-2020, Yann Collet, Facebook, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This source code is licensed under both the BSD-style license (found in the
|
|
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
|
|
* in the COPYING file in the root directory of this source tree).
|
|
* You may select, at your option, one of the above-listed licenses.
|
|
*/
|
|
|
|
#ifndef ZSTD_CCOMMON_H_MODULE
|
|
#define ZSTD_CCOMMON_H_MODULE
|
|
|
|
/* this module contains definitions which must be identical
|
|
* across compression, decompression and dictBuilder.
|
|
* It also contains a few functions useful to at least 2 of them
|
|
* and which benefit from being inlined */
|
|
|
|
/*-*************************************
|
|
* Dependencies
|
|
***************************************/
|
|
#if !defined(ZSTD_NO_INTRINSICS) && defined(__ARM_NEON)
|
|
#include <arm_neon.h>
|
|
#endif
|
|
#include "compiler.h"
|
|
#include "mem.h"
|
|
#include "debug.h" /* assert, DEBUGLOG, RAWLOG, g_debuglevel */
|
|
#include "error_private.h"
|
|
#define ZSTD_STATIC_LINKING_ONLY
|
|
#include "../zstd.h"
|
|
#define FSE_STATIC_LINKING_ONLY
|
|
#include "fse.h"
|
|
#define HUF_STATIC_LINKING_ONLY
|
|
#include "huf.h"
|
|
#ifndef XXH_STATIC_LINKING_ONLY
|
|
# define XXH_STATIC_LINKING_ONLY /* XXH64_state_t */
|
|
#endif
|
|
#include "xxhash.h" /* XXH_reset, update, digest */
|
|
|
|
#if defined (__cplusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* ---- static assert (debug) --- */
|
|
#define ZSTD_STATIC_ASSERT(c) DEBUG_STATIC_ASSERT(c)
|
|
#define FSE_isError ERR_isError
|
|
#define HUF_isError ERR_isError
|
|
|
|
|
|
/*-*************************************
|
|
* shared macros
|
|
***************************************/
|
|
#undef MIN
|
|
#undef MAX
|
|
#define MIN(a,b) ((a)<(b) ? (a) : (b))
|
|
#define MAX(a,b) ((a)>(b) ? (a) : (b))
|
|
|
|
/**
|
|
* Ignore: this is an internal helper.
|
|
*
|
|
* This is a helper function to help force C99-correctness during compilation.
|
|
* Under strict compilation modes, variadic macro arguments can't be empty.
|
|
* However, variadic function arguments can be. Using a function therefore lets
|
|
* us statically check that at least one (string) argument was passed,
|
|
* independent of the compilation flags.
|
|
*/
|
|
static INLINE_KEYWORD UNUSED_ATTR
|
|
void _force_has_format_string(const char *format, ...) {
|
|
(void)format;
|
|
}
|
|
|
|
/**
|
|
* Ignore: this is an internal helper.
|
|
*
|
|
* We want to force this function invocation to be syntactically correct, but
|
|
* we don't want to force runtime evaluation of its arguments.
|
|
*/
|
|
#define _FORCE_HAS_FORMAT_STRING(...) \
|
|
if (0) { \
|
|
_force_has_format_string(__VA_ARGS__); \
|
|
}
|
|
|
|
/**
|
|
* Return the specified error if the condition evaluates to true.
|
|
*
|
|
* In debug modes, prints additional information.
|
|
* In order to do that (particularly, printing the conditional that failed),
|
|
* this can't just wrap RETURN_ERROR().
|
|
*/
|
|
#define RETURN_ERROR_IF(cond, err, ...) \
|
|
if (cond) { \
|
|
RAWLOG(3, "%s:%d: ERROR!: check %s failed, returning %s", \
|
|
__FILE__, __LINE__, ZSTD_QUOTE(cond), ZSTD_QUOTE(ERROR(err))); \
|
|
_FORCE_HAS_FORMAT_STRING(__VA_ARGS__); \
|
|
RAWLOG(3, ": " __VA_ARGS__); \
|
|
RAWLOG(3, "\n"); \
|
|
return ERROR(err); \
|
|
}
|
|
|
|
/**
|
|
* Unconditionally return the specified error.
|
|
*
|
|
* In debug modes, prints additional information.
|
|
*/
|
|
#define RETURN_ERROR(err, ...) \
|
|
do { \
|
|
RAWLOG(3, "%s:%d: ERROR!: unconditional check failed, returning %s", \
|
|
__FILE__, __LINE__, ZSTD_QUOTE(ERROR(err))); \
|
|
_FORCE_HAS_FORMAT_STRING(__VA_ARGS__); \
|
|
RAWLOG(3, ": " __VA_ARGS__); \
|
|
RAWLOG(3, "\n"); \
|
|
return ERROR(err); \
|
|
} while(0);
|
|
|
|
/**
|
|
* If the provided expression evaluates to an error code, returns that error code.
|
|
*
|
|
* In debug modes, prints additional information.
|
|
*/
|
|
#define FORWARD_IF_ERROR(err, ...) \
|
|
do { \
|
|
size_t const err_code = (err); \
|
|
if (ERR_isError(err_code)) { \
|
|
RAWLOG(3, "%s:%d: ERROR!: forwarding error in %s: %s", \
|
|
__FILE__, __LINE__, ZSTD_QUOTE(err), ERR_getErrorName(err_code)); \
|
|
_FORCE_HAS_FORMAT_STRING(__VA_ARGS__); \
|
|
RAWLOG(3, ": " __VA_ARGS__); \
|
|
RAWLOG(3, "\n"); \
|
|
return err_code; \
|
|
} \
|
|
} while(0);
|
|
|
|
|
|
/*-*************************************
|
|
* Common constants
|
|
***************************************/
|
|
#define ZSTD_OPT_NUM (1<<12)
|
|
|
|
#define ZSTD_REP_NUM 3 /* number of repcodes */
|
|
#define ZSTD_REP_MOVE (ZSTD_REP_NUM-1)
|
|
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_FRAMEIDSIZE 4 /* magic number size */
|
|
|
|
#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 ZSTD_FRAMECHECKSUMSIZE 4
|
|
|
|
#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 DefaultMaxOff 28
|
|
#define MaxOff 31
|
|
#define MaxSeq MAX(MaxLL, MaxML) /* Assumption : MaxOff < MaxLL,MaxML */
|
|
#define MLFSELog 9
|
|
#define LLFSELog 9
|
|
#define OffFSELog 8
|
|
#define MaxFSELog MAX(MAX(MLFSELog, LLFSELog), OffFSELog)
|
|
|
|
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[DefaultMaxOff+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) {
|
|
#if !defined(ZSTD_NO_INTRINSICS) && defined(__ARM_NEON)
|
|
vst1_u8((uint8_t*)dst, vld1_u8((const uint8_t*)src));
|
|
#else
|
|
memcpy(dst, src, 8);
|
|
#endif
|
|
}
|
|
|
|
#define COPY8(d,s) { ZSTD_copy8(d,s); d+=8; s+=8; }
|
|
static void ZSTD_copy16(void* dst, const void* src) {
|
|
#if !defined(ZSTD_NO_INTRINSICS) && defined(__ARM_NEON)
|
|
vst1q_u8((uint8_t*)dst, vld1q_u8((const uint8_t*)src));
|
|
#else
|
|
memcpy(dst, src, 16);
|
|
#endif
|
|
}
|
|
#define COPY16(d,s) { ZSTD_copy16(d,s); d+=16; s+=16; }
|
|
|
|
#define WILDCOPY_OVERLENGTH 32
|
|
#define WILDCOPY_VECLEN 16
|
|
|
|
typedef enum {
|
|
ZSTD_no_overlap,
|
|
ZSTD_overlap_src_before_dst
|
|
/* ZSTD_overlap_dst_before_src, */
|
|
} ZSTD_overlap_e;
|
|
|
|
/*! ZSTD_wildcopy() :
|
|
* Custom version of memcpy(), can over read/write up to WILDCOPY_OVERLENGTH bytes (if length==0)
|
|
* @param ovtype controls the overlap detection
|
|
* - ZSTD_no_overlap: The source and destination are guaranteed to be at least WILDCOPY_VECLEN bytes apart.
|
|
* - ZSTD_overlap_src_before_dst: The src and dst may overlap, but they MUST be at least 8 bytes apart.
|
|
* The src buffer must be before the dst buffer.
|
|
*/
|
|
MEM_STATIC FORCE_INLINE_ATTR
|
|
void ZSTD_wildcopy(void* dst, const void* src, ptrdiff_t length, ZSTD_overlap_e const ovtype)
|
|
{
|
|
ptrdiff_t diff = (BYTE*)dst - (const BYTE*)src;
|
|
const BYTE* ip = (const BYTE*)src;
|
|
BYTE* op = (BYTE*)dst;
|
|
BYTE* const oend = op + length;
|
|
|
|
assert(diff >= 8 || (ovtype == ZSTD_no_overlap && diff <= -WILDCOPY_VECLEN));
|
|
|
|
if (ovtype == ZSTD_overlap_src_before_dst && diff < WILDCOPY_VECLEN) {
|
|
/* Handle short offset copies. */
|
|
do {
|
|
COPY8(op, ip)
|
|
} while (op < oend);
|
|
} else {
|
|
assert(diff >= WILDCOPY_VECLEN || diff <= -WILDCOPY_VECLEN);
|
|
/* Separate out the first COPY16() call because the copy length is
|
|
* almost certain to be short, so the branches have different
|
|
* probabilities. Since it is almost certain to be short, only do
|
|
* one COPY16() in the first call. Then, do two calls per loop since
|
|
* at that point it is more likely to have a high trip count.
|
|
*/
|
|
#ifndef __aarch64__
|
|
do {
|
|
COPY16(op, ip);
|
|
}
|
|
while (op < oend);
|
|
#else
|
|
COPY16(op, ip);
|
|
if (op >= oend) return;
|
|
do {
|
|
COPY16(op, ip);
|
|
COPY16(op, ip);
|
|
}
|
|
while (op < oend);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
MEM_STATIC size_t ZSTD_limitCopy(void* dst, size_t dstCapacity, const void* src, size_t srcSize)
|
|
{
|
|
size_t const length = MIN(dstCapacity, srcSize);
|
|
if (length > 0) {
|
|
memcpy(dst, src, length);
|
|
}
|
|
return length;
|
|
}
|
|
|
|
/* define "workspace is too large" as this number of times larger than needed */
|
|
#define ZSTD_WORKSPACETOOLARGE_FACTOR 3
|
|
|
|
/* when workspace is continuously too large
|
|
* during at least this number of times,
|
|
* context's memory usage is considered wasteful,
|
|
* because it's sized to handle a worst case scenario which rarely happens.
|
|
* In which case, resize it down to free some memory */
|
|
#define ZSTD_WORKSPACETOOLARGE_MAXDURATION 128
|
|
|
|
|
|
/*-*******************************************
|
|
* Private declarations
|
|
*********************************************/
|
|
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;
|
|
size_t maxNbSeq;
|
|
size_t maxNbLit;
|
|
U32 longLengthID; /* 0 == no longLength; 1 == Lit.longLength; 2 == Match.longLength; */
|
|
U32 longLengthPos;
|
|
} seqStore_t;
|
|
|
|
typedef struct {
|
|
U32 litLength;
|
|
U32 matchLength;
|
|
} ZSTD_sequenceLength;
|
|
|
|
/**
|
|
* Returns the ZSTD_sequenceLength for the given sequences. It handles the decoding of long sequences
|
|
* indicated by longLengthPos and longLengthID, and adds MINMATCH back to matchLength.
|
|
*/
|
|
MEM_STATIC ZSTD_sequenceLength ZSTD_getSequenceLength(seqStore_t const* seqStore, seqDef const* seq)
|
|
{
|
|
ZSTD_sequenceLength seqLen;
|
|
seqLen.litLength = seq->litLength;
|
|
seqLen.matchLength = seq->matchLength + MINMATCH;
|
|
if (seqStore->longLengthPos == (U32)(seq - seqStore->sequencesStart)) {
|
|
if (seqStore->longLengthID == 1) {
|
|
seqLen.litLength += 0xFFFF;
|
|
}
|
|
if (seqStore->longLengthID == 2) {
|
|
seqLen.matchLength += 0xFFFF;
|
|
}
|
|
}
|
|
return seqLen;
|
|
}
|
|
|
|
/**
|
|
* Contains the compressed frame size and an upper-bound for the decompressed frame size.
|
|
* Note: before using `compressedSize`, check for errors using ZSTD_isError().
|
|
* similarly, before using `decompressedBound`, check for errors using:
|
|
* `decompressedBound != ZSTD_CONTENTSIZE_ERROR`
|
|
*/
|
|
typedef struct {
|
|
size_t compressedSize;
|
|
unsigned long long decompressedBound;
|
|
} ZSTD_frameSizeInfo; /* decompress & legacy */
|
|
|
|
const seqStore_t* ZSTD_getSeqStore(const ZSTD_CCtx* ctx); /* compress & dictBuilder */
|
|
void ZSTD_seqToCodes(const seqStore_t* seqStorePtr); /* compress, dictBuilder, decodeCorpus (shouldn't get its definition from here) */
|
|
|
|
/* 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);
|
|
|
|
|
|
MEM_STATIC U32 ZSTD_highbit32(U32 val) /* compress, dictBuilder, decodeCorpus */
|
|
{
|
|
assert(val != 0);
|
|
{
|
|
# if defined(_MSC_VER) /* Visual */
|
|
unsigned long r=0;
|
|
return _BitScanReverse(&r, val) ? (unsigned)r : 0;
|
|
# elif defined(__GNUC__) && (__GNUC__ >= 3) /* GCC Intrinsic */
|
|
return __builtin_clz (val) ^ 31;
|
|
# elif defined(__ICCARM__) /* IAR Intrinsic */
|
|
return 31 - __CLZ(val);
|
|
# else /* Software version */
|
|
static const U32 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;
|
|
v |= v >> 1;
|
|
v |= v >> 2;
|
|
v |= v >> 4;
|
|
v |= v >> 8;
|
|
v |= v >> 16;
|
|
return DeBruijnClz[(v * 0x07C4ACDDU) >> 27];
|
|
# endif
|
|
}
|
|
}
|
|
|
|
|
|
/* 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); /* zstdmt, adaptive_compression (shouldn't get this definition from here) */
|
|
|
|
|
|
typedef struct {
|
|
blockType_e blockType;
|
|
U32 lastBlock;
|
|
U32 origSize;
|
|
} blockProperties_t; /* declared here for decompress and fullbench */
|
|
|
|
/*! ZSTD_getcBlockSize() :
|
|
* Provides the size of compressed block from block header `src` */
|
|
/* Used by: decompress, fullbench (does not get its definition from here) */
|
|
size_t ZSTD_getcBlockSize(const void* src, size_t srcSize,
|
|
blockProperties_t* bpPtr);
|
|
|
|
/*! ZSTD_decodeSeqHeaders() :
|
|
* decode sequence header from src */
|
|
/* Used by: decompress, fullbench (does not get its definition from here) */
|
|
size_t ZSTD_decodeSeqHeaders(ZSTD_DCtx* dctx, int* nbSeqPtr,
|
|
const void* src, size_t srcSize);
|
|
|
|
|
|
#if defined (__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* ZSTD_CCOMMON_H_MODULE */
|