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zstandard: vendor python-zstandard 0.11...
zstandard: vendor python-zstandard 0.11 The upstream source distribution from PyPI was extracted. Unwanted files were removed. The clang-format ignore list was updated to reflect the new source of files. The project contains a vendored copy of zstandard 1.3.8. The old version was 1.3.6. This should result in some minor performance wins. test-check-py3-compat.t was updated to reflect now-passing tests on Python 3.8. Some HTTP tests were updated to reflect new zstd compression output. # no-check-commit because 3rd party code has different style guidelines Differential Revision: https://phab.mercurial-scm.org/D6199

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zstd_internal.h
266 lines | 9.3 KiB | text/x-c | CLexer
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r37513 /*
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r30434 * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
* All rights reserved.
*
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r37513 * 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.
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r30434 */
#ifndef ZSTD_CCOMMON_H_MODULE
#define ZSTD_CCOMMON_H_MODULE
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r37513 /* 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
***************************************/
#include "compiler.h"
#include "mem.h"
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r40157 #include "debug.h" /* assert, DEBUGLOG, RAWLOG, g_debuglevel */
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r37513 #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 */
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r30434 #endif
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r37513 #include "xxhash.h" /* XXH_reset, update, digest */
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r30434
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r37513
#if defined (__cplusplus)
extern "C" {
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r30434 #endif
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r40157 /* ---- static assert (debug) --- */
#define ZSTD_STATIC_ASSERT(c) DEBUG_STATIC_ASSERT(c)
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r42237 #define ZSTD_isError ERR_isError /* for inlining */
#define FSE_isError ERR_isError
#define HUF_isError ERR_isError
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r30434
/*-*************************************
* shared macros
***************************************/
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r37513 #undef MIN
#undef MAX
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r30434 #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 */
/*-*************************************
* 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 };
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r40157 #define ZSTD_FRAMEIDSIZE 4 /* magic number size */
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r37513
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r30434 #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 Litbits 8
#define MaxLit ((1<<Litbits) - 1)
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r37513 #define MaxML 52
#define MaxLL 35
#define DefaultMaxOff 28
#define MaxOff 31
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r30434 #define MaxSeq MAX(MaxLL, MaxML) /* Assumption : MaxOff < MaxLL,MaxML */
#define MLFSELog 9
#define LLFSELog 9
#define OffFSELog 8
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r37513 #define MaxFSELog MAX(MAX(MLFSELog, LLFSELog), OffFSELog)
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r30434
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r37513 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,
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r30434 13,14,15,16 };
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r37513 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,
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r30434 -1,-1,-1,-1 };
#define LL_DEFAULTNORMLOG 6 /* for static allocation */
static const U32 LL_defaultNormLog = LL_DEFAULTNORMLOG;
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r37513 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,
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r30434 12,13,14,15,16 };
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r37513 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,
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r30434 -1,-1,-1,-1,-1 };
#define ML_DEFAULTNORMLOG 6 /* for static allocation */
static const U32 ML_defaultNormLog = ML_DEFAULTNORMLOG;
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r37513 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 };
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r30434 #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) { memcpy(dst, src, 8); }
#define COPY8(d,s) { ZSTD_copy8(d,s); d+=8; s+=8; }
/*! ZSTD_wildcopy() :
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r37513 * custom version of memcpy(), can overwrite up to WILDCOPY_OVERLENGTH bytes (if length==0) */
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r30434 #define WILDCOPY_OVERLENGTH 8
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r30822 MEM_STATIC void ZSTD_wildcopy(void* dst, const void* src, ptrdiff_t length)
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r30434 {
const BYTE* ip = (const BYTE*)src;
BYTE* op = (BYTE*)dst;
BYTE* const oend = op + length;
do
COPY8(op, ip)
while (op < oend);
}
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 */
{
const BYTE* ip = (const BYTE*)src;
BYTE* op = (BYTE*)dst;
BYTE* const oend = (BYTE*)dstEnd;
do
COPY8(op, ip)
while (op < oend);
}
/*-*******************************************
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r37513 * Private declarations
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r30434 *********************************************/
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;
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r40157 size_t maxNbSeq;
size_t maxNbLit;
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r30434 U32 longLengthID; /* 0 == no longLength; 1 == Lit.longLength; 2 == Match.longLength; */
U32 longLengthPos;
} seqStore_t;
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r37513 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) */
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r30434
/* custom memory allocation functions */
void* ZSTD_malloc(size_t size, ZSTD_customMem customMem);
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r37513 void* ZSTD_calloc(size_t size, ZSTD_customMem customMem);
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r30434 void ZSTD_free(void* ptr, ZSTD_customMem customMem);
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r37513 MEM_STATIC U32 ZSTD_highbit32(U32 val) /* compress, dictBuilder, decodeCorpus */
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r30434 {
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r37513 assert(val != 0);
{
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r30434 # if defined(_MSC_VER) /* Visual */
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r37513 unsigned long r=0;
_BitScanReverse(&r, val);
return (unsigned)r;
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r30434 # elif defined(__GNUC__) && (__GNUC__ >= 3) /* GCC Intrinsic */
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r37513 return 31 - __builtin_clz(val);
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r30434 # else /* Software version */
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r37513 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];
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r30434 # endif
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r37513 }
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r30434 }
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r30895 /* ZSTD_invalidateRepCodes() :
* ensures next compression will not use repcodes from previous block.
* Note : only works with regular variant;
* do not use with extDict variant ! */
Gregory Szorc
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r37513 void ZSTD_invalidateRepCodes(ZSTD_CCtx* cctx); /* zstdmt, adaptive_compression (shouldn't get this definition from here) */
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r30895
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r37513 typedef struct {
blockType_e blockType;
U32 lastBlock;
U32 origSize;
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r42237 } blockProperties_t; /* declared here for decompress and fullbench */
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r37513
/*! 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);
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r42237 /*! 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);
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r37513 #if defined (__cplusplus)
}
#endif
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r30434 #endif /* ZSTD_CCOMMON_H_MODULE */