39ed39900e
Release notes: - https://github.com/facebook/zstd/releases/tag/v1.5.1 - https://github.com/facebook/zstd/releases/tag/v1.5.2
236 lines
9.3 KiB
C++
236 lines
9.3 KiB
C++
/*
|
|
* Copyright (c) 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.
|
|
*/
|
|
|
|
|
|
/* zstd_decompress_internal:
|
|
* objects and definitions shared within lib/decompress modules */
|
|
|
|
#ifndef ZSTD_DECOMPRESS_INTERNAL_H
|
|
#define ZSTD_DECOMPRESS_INTERNAL_H
|
|
|
|
|
|
/*-*******************************************************
|
|
* Dependencies
|
|
*********************************************************/
|
|
#include "../common/mem.h" /* BYTE, U16, U32 */
|
|
#include "../common/zstd_internal.h" /* constants : MaxLL, MaxML, MaxOff, LLFSELog, etc. */
|
|
|
|
|
|
|
|
/*-*******************************************************
|
|
* Constants
|
|
*********************************************************/
|
|
static UNUSED_ATTR const U32 LL_base[MaxLL+1] = {
|
|
0, 1, 2, 3, 4, 5, 6, 7,
|
|
8, 9, 10, 11, 12, 13, 14, 15,
|
|
16, 18, 20, 22, 24, 28, 32, 40,
|
|
48, 64, 0x80, 0x100, 0x200, 0x400, 0x800, 0x1000,
|
|
0x2000, 0x4000, 0x8000, 0x10000 };
|
|
|
|
static UNUSED_ATTR const U32 OF_base[MaxOff+1] = {
|
|
0, 1, 1, 5, 0xD, 0x1D, 0x3D, 0x7D,
|
|
0xFD, 0x1FD, 0x3FD, 0x7FD, 0xFFD, 0x1FFD, 0x3FFD, 0x7FFD,
|
|
0xFFFD, 0x1FFFD, 0x3FFFD, 0x7FFFD, 0xFFFFD, 0x1FFFFD, 0x3FFFFD, 0x7FFFFD,
|
|
0xFFFFFD, 0x1FFFFFD, 0x3FFFFFD, 0x7FFFFFD, 0xFFFFFFD, 0x1FFFFFFD, 0x3FFFFFFD, 0x7FFFFFFD };
|
|
|
|
static UNUSED_ATTR const U8 OF_bits[MaxOff+1] = {
|
|
0, 1, 2, 3, 4, 5, 6, 7,
|
|
8, 9, 10, 11, 12, 13, 14, 15,
|
|
16, 17, 18, 19, 20, 21, 22, 23,
|
|
24, 25, 26, 27, 28, 29, 30, 31 };
|
|
|
|
static UNUSED_ATTR const U32 ML_base[MaxML+1] = {
|
|
3, 4, 5, 6, 7, 8, 9, 10,
|
|
11, 12, 13, 14, 15, 16, 17, 18,
|
|
19, 20, 21, 22, 23, 24, 25, 26,
|
|
27, 28, 29, 30, 31, 32, 33, 34,
|
|
35, 37, 39, 41, 43, 47, 51, 59,
|
|
67, 83, 99, 0x83, 0x103, 0x203, 0x403, 0x803,
|
|
0x1003, 0x2003, 0x4003, 0x8003, 0x10003 };
|
|
|
|
|
|
/*-*******************************************************
|
|
* Decompression types
|
|
*********************************************************/
|
|
typedef struct {
|
|
U32 fastMode;
|
|
U32 tableLog;
|
|
} ZSTD_seqSymbol_header;
|
|
|
|
typedef struct {
|
|
U16 nextState;
|
|
BYTE nbAdditionalBits;
|
|
BYTE nbBits;
|
|
U32 baseValue;
|
|
} ZSTD_seqSymbol;
|
|
|
|
#define SEQSYMBOL_TABLE_SIZE(log) (1 + (1 << (log)))
|
|
|
|
#define ZSTD_BUILD_FSE_TABLE_WKSP_SIZE (sizeof(S16) * (MaxSeq + 1) + (1u << MaxFSELog) + sizeof(U64))
|
|
#define ZSTD_BUILD_FSE_TABLE_WKSP_SIZE_U32 ((ZSTD_BUILD_FSE_TABLE_WKSP_SIZE + sizeof(U32) - 1) / sizeof(U32))
|
|
|
|
typedef struct {
|
|
ZSTD_seqSymbol LLTable[SEQSYMBOL_TABLE_SIZE(LLFSELog)]; /* Note : Space reserved for FSE Tables */
|
|
ZSTD_seqSymbol OFTable[SEQSYMBOL_TABLE_SIZE(OffFSELog)]; /* is also used as temporary workspace while building hufTable during DDict creation */
|
|
ZSTD_seqSymbol MLTable[SEQSYMBOL_TABLE_SIZE(MLFSELog)]; /* and therefore must be at least HUF_DECOMPRESS_WORKSPACE_SIZE large */
|
|
HUF_DTable hufTable[HUF_DTABLE_SIZE(HufLog)]; /* can accommodate HUF_decompress4X */
|
|
U32 rep[ZSTD_REP_NUM];
|
|
U32 workspace[ZSTD_BUILD_FSE_TABLE_WKSP_SIZE_U32];
|
|
} ZSTD_entropyDTables_t;
|
|
|
|
typedef enum { ZSTDds_getFrameHeaderSize, ZSTDds_decodeFrameHeader,
|
|
ZSTDds_decodeBlockHeader, ZSTDds_decompressBlock,
|
|
ZSTDds_decompressLastBlock, ZSTDds_checkChecksum,
|
|
ZSTDds_decodeSkippableHeader, ZSTDds_skipFrame } ZSTD_dStage;
|
|
|
|
typedef enum { zdss_init=0, zdss_loadHeader,
|
|
zdss_read, zdss_load, zdss_flush } ZSTD_dStreamStage;
|
|
|
|
typedef enum {
|
|
ZSTD_use_indefinitely = -1, /* Use the dictionary indefinitely */
|
|
ZSTD_dont_use = 0, /* Do not use the dictionary (if one exists free it) */
|
|
ZSTD_use_once = 1 /* Use the dictionary once and set to ZSTD_dont_use */
|
|
} ZSTD_dictUses_e;
|
|
|
|
/* Hashset for storing references to multiple ZSTD_DDict within ZSTD_DCtx */
|
|
typedef struct {
|
|
const ZSTD_DDict** ddictPtrTable;
|
|
size_t ddictPtrTableSize;
|
|
size_t ddictPtrCount;
|
|
} ZSTD_DDictHashSet;
|
|
|
|
#ifndef ZSTD_DECODER_INTERNAL_BUFFER
|
|
# define ZSTD_DECODER_INTERNAL_BUFFER (1 << 16)
|
|
#endif
|
|
|
|
#define ZSTD_LBMIN 64
|
|
#define ZSTD_LBMAX (128 << 10)
|
|
|
|
/* extra buffer, compensates when dst is not large enough to store litBuffer */
|
|
#define ZSTD_LITBUFFEREXTRASIZE BOUNDED(ZSTD_LBMIN, ZSTD_DECODER_INTERNAL_BUFFER, ZSTD_LBMAX)
|
|
|
|
typedef enum {
|
|
ZSTD_not_in_dst = 0, /* Stored entirely within litExtraBuffer */
|
|
ZSTD_in_dst = 1, /* Stored entirely within dst (in memory after current output write) */
|
|
ZSTD_split = 2 /* Split between litExtraBuffer and dst */
|
|
} ZSTD_litLocation_e;
|
|
|
|
struct ZSTD_DCtx_s
|
|
{
|
|
const ZSTD_seqSymbol* LLTptr;
|
|
const ZSTD_seqSymbol* MLTptr;
|
|
const ZSTD_seqSymbol* OFTptr;
|
|
const HUF_DTable* HUFptr;
|
|
ZSTD_entropyDTables_t entropy;
|
|
U32 workspace[HUF_DECOMPRESS_WORKSPACE_SIZE_U32]; /* space needed when building huffman tables */
|
|
const void* previousDstEnd; /* detect continuity */
|
|
const void* prefixStart; /* start of current segment */
|
|
const void* virtualStart; /* virtual start of previous segment if it was just before current one */
|
|
const void* dictEnd; /* end of previous segment */
|
|
size_t expected;
|
|
ZSTD_frameHeader fParams;
|
|
U64 processedCSize;
|
|
U64 decodedSize;
|
|
blockType_e bType; /* used in ZSTD_decompressContinue(), store blockType between block header decoding and block decompression stages */
|
|
ZSTD_dStage stage;
|
|
U32 litEntropy;
|
|
U32 fseEntropy;
|
|
XXH64_state_t xxhState;
|
|
size_t headerSize;
|
|
ZSTD_format_e format;
|
|
ZSTD_forceIgnoreChecksum_e forceIgnoreChecksum; /* User specified: if == 1, will ignore checksums in compressed frame. Default == 0 */
|
|
U32 validateChecksum; /* if == 1, will validate checksum. Is == 1 if (fParams.checksumFlag == 1) and (forceIgnoreChecksum == 0). */
|
|
const BYTE* litPtr;
|
|
ZSTD_customMem customMem;
|
|
size_t litSize;
|
|
size_t rleSize;
|
|
size_t staticSize;
|
|
#if DYNAMIC_BMI2 != 0
|
|
int bmi2; /* == 1 if the CPU supports BMI2 and 0 otherwise. CPU support is determined dynamically once per context lifetime. */
|
|
#endif
|
|
|
|
/* dictionary */
|
|
ZSTD_DDict* ddictLocal;
|
|
const ZSTD_DDict* ddict; /* set by ZSTD_initDStream_usingDDict(), or ZSTD_DCtx_refDDict() */
|
|
U32 dictID;
|
|
int ddictIsCold; /* if == 1 : dictionary is "new" for working context, and presumed "cold" (not in cpu cache) */
|
|
ZSTD_dictUses_e dictUses;
|
|
ZSTD_DDictHashSet* ddictSet; /* Hash set for multiple ddicts */
|
|
ZSTD_refMultipleDDicts_e refMultipleDDicts; /* User specified: if == 1, will allow references to multiple DDicts. Default == 0 (disabled) */
|
|
|
|
/* streaming */
|
|
ZSTD_dStreamStage streamStage;
|
|
char* inBuff;
|
|
size_t inBuffSize;
|
|
size_t inPos;
|
|
size_t maxWindowSize;
|
|
char* outBuff;
|
|
size_t outBuffSize;
|
|
size_t outStart;
|
|
size_t outEnd;
|
|
size_t lhSize;
|
|
#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT>=1)
|
|
void* legacyContext;
|
|
U32 previousLegacyVersion;
|
|
U32 legacyVersion;
|
|
#endif
|
|
U32 hostageByte;
|
|
int noForwardProgress;
|
|
ZSTD_bufferMode_e outBufferMode;
|
|
ZSTD_outBuffer expectedOutBuffer;
|
|
|
|
/* workspace */
|
|
BYTE* litBuffer;
|
|
const BYTE* litBufferEnd;
|
|
ZSTD_litLocation_e litBufferLocation;
|
|
BYTE litExtraBuffer[ZSTD_LITBUFFEREXTRASIZE + WILDCOPY_OVERLENGTH]; /* literal buffer can be split between storage within dst and within this scratch buffer */
|
|
BYTE headerBuffer[ZSTD_FRAMEHEADERSIZE_MAX];
|
|
|
|
size_t oversizedDuration;
|
|
|
|
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
|
|
void const* dictContentBeginForFuzzing;
|
|
void const* dictContentEndForFuzzing;
|
|
#endif
|
|
|
|
/* Tracing */
|
|
#if ZSTD_TRACE
|
|
ZSTD_TraceCtx traceCtx;
|
|
#endif
|
|
}; /* typedef'd to ZSTD_DCtx within "zstd.h" */
|
|
|
|
MEM_STATIC int ZSTD_DCtx_get_bmi2(const struct ZSTD_DCtx_s *dctx) {
|
|
#if DYNAMIC_BMI2 != 0
|
|
return dctx->bmi2;
|
|
#else
|
|
(void)dctx;
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
/*-*******************************************************
|
|
* Shared internal functions
|
|
*********************************************************/
|
|
|
|
/*! ZSTD_loadDEntropy() :
|
|
* dict : must point at beginning of a valid zstd dictionary.
|
|
* @return : size of dictionary header (size of magic number + dict ID + entropy tables) */
|
|
size_t ZSTD_loadDEntropy(ZSTD_entropyDTables_t* entropy,
|
|
const void* const dict, size_t const dictSize);
|
|
|
|
/*! ZSTD_checkContinuity() :
|
|
* check if next `dst` follows previous position, where decompression ended.
|
|
* If yes, do nothing (continue on current segment).
|
|
* If not, classify previous segment as "external dictionary", and start a new segment.
|
|
* This function cannot fail. */
|
|
void ZSTD_checkContinuity(ZSTD_DCtx* dctx, const void* dst, size_t dstSize);
|
|
|
|
|
|
#endif /* ZSTD_DECOMPRESS_INTERNAL_H */
|