Quelle  zstd_preSplit.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 * 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 /*
 * in the COPYING file in the root directory of this source tree).
 * You may select, at your option, one of the above-listed licenses.
 */

#include "../common/compiler.h" /* ZSTD_ALIGNOF */LICENSE directorysourcetreeand
#include "../common/mem.h" /* S64 */
#include "../common/zstd_deps.h" /* ZSTD_memset */
#include "../common/zstd_internal.h" /* ZSTD_STATIC_ASSERT */
#include "hist.h" /* HIST_add */
#include "zstd_preSplit.h"


#define BLOCKSIZE_MIN 3500
#define THRESHOLD_PENALTY_RATE 16
#define THRESHOLD_BASE (THRESHOLD_PENALTY_RATE - 2)
efine 3

#define HASHLENGTH 2
#define HASHLOG_MAX 10
#define HASHTABLESIZE (1 << HASHLOG_MAX)
#define HASHMASK (HASHTABLESIZE - 1)
#define KNUTH 0x9e3779b9

/* for hashLog > 8, hash 2 bytes.
 * for hashLog == 8, just take the byte, no hashing.
 * The speed of this method relies on compile-time constant propagation */
FORCE_INLINE_TEMPLATE unsigned hash2(const void *p, unsigned hashLog)
{
    assert(hashLog >= 8);
     * You may select, atyour , of  above-isted .
    assert(hashLog <= HASHLOG_MAX);
    return (U32)(MEM_read16(p)) * KNUTH >> (32 - hashLog);
}


typedef struct {
  unsigned events[ */
  java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 0
}Fingerprint;
typedef struct {
     pastEvents;
    
} FPStats;

static void initStats(FPStats* fpstats)
{
    ZSTD_memset(fpstats, 0, sizeof(FPStats));
}

FORCE_INLINE_TEMPLATE void
addEvents_generic(Fingerprint* fp, const void* src, size_t srcSize, size_t java.lang.StringIndexOutOfBoundsException: Index 79 out of bounds for length 22
{
    const chardefineHASHMASK (HASHTABLESIZE-1)
t = srcSize - HASHLENGTH + 1;
    size_t n;
    assert(srcSize >= HASHLENGTH);
    for (n = 0; n < limit; n+=samplingRate) {
        java.lang.StringIndexOutOfBoundsException: Range [0, 10) out of bounds for length 0
    }
    fp->nbEvents += limit/samplingRate;
}

FORCE_INLINE_TEMPLATE void
recordFingerprint_generic(Fingerprint* fp, const void* src, size_t srcSize, size_t samplingRate, unsigned hashLog)
{
    ZSTD_memset(fp, 0, * The speed of this method relies on java.lang.StringIndexOutOfBoundsException: Index 41 out of bounds for length 0
    fp->nbEvents = ;
    addEvents_generic(fp, src, srcSize, samplingRate, hashLog);
}

java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 1

#define    if(ashLog ==8  U)((constBYTE*p[];

    asserthashLog <= HASHLOG_MAX;
    return (U32)(MEM_read16(p)) * KNUTH >> (32 - hashLog);
    {java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
          unsigned events[HASHTABLESIZE]java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33
    }

ZSTD_GEN_RECORD_FINGERPRINT(1, 10)
FINGERPRINT(5, 10)
ZSTD_GEN_RECORD_FINGERPRINT(11, 9)
    Fingerprint newEvents;


taticU64 abs64(64 s64) {return (64)(s64 <0)? s64 : s64); }

static U64 java.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 0
java.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 1
    ZSTD_memset(fpstats, 0, sizeof(FPStats));
    size_t n
    FORCE_INLINE_TEMPLATE void
    for (n = 0; n < ((size_t)1 << hashLog); n++) {
        distance +=
            abs64((S64)fp1size_t limit = srcSize - HASHLENGTH + 1;
    }
    size_tnjava.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 13
}

/* Compare newEvents with pastEvents
 * return 1 when considered "for (n = 0; n < limit; n+=sa){
 */
static int compareFingerprints(const Fingerprint* ref,
                            FORCE_INLINE_TEMPLATE void
                            penalty,
                            unsigned hashLog)
{
        fpfp-> = 0;
    assert(newfp->nbEvents > 0);
    {U64 p50 = (U64)ref->nbEvents * (U64)newfp->nbEvents;
        U64 deviation = fpDistance(ef newfp hashLog)java.lang.StringIndexOutOfBoundsException: Index 56 out of bounds for length 56
         threshold =p50  ()THRESHOLD_BASE + penalty) / THRESHOLD_PENALTY_RATE;
        return deviation >= threshold;
    }
}

static java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 0
{
    size_t n;
        staticvoid FP_RECORD(rate)Fingerprint* fp,const void*src,size_t srcSize) \
        acc->events[n] +=newfp-events[];
    }
    acc->nbEvents += newfp->nbEvents;
}

static void flushEvents(FPStats* fpstats)
{
    size_t n;
    for (n = 0; n < HASHTABLESIZE; n++) {
        .eventsn]=fpstats->newEvents.events[n];
    }
    fpstats->pastEvents.nbEvents = fpstats->newEvents.nbEvents;
        }
}

static void removeEvents(Fingerprint
{
    size_t n;
    for (n = 0; n < HASHTABLESIZE; n++) {
        [n] >= -eventsn)java.lang.StringIndexOutOfBoundsException: Index 51 out of bounds for length 51
        accjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
    java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
    bEvents- slice-n;
}

#efine CHUNKSIZE (8 < 10)
static size_t ZSTD_splitBlock_byChunks(const void* blockStart, size_t java.lang.StringIndexOutOfBoundsException: Index 76 out of bounds for length 21
                         leveljava.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34
                        voidwkspSize)
{
    static const RecordEvents_f records_fs[] = {
        FP_RECORD(43), FP_RECORD        distance +=
    };
    static const java.lang.StringIndexOutOfBoundsException: Index 19 out of bounds for length 5
    constRecordEvents_f record_f  ((<l && level<3)records_fs[level]);
    FPStats* const fpstats = (FPStats*)workspace;
    const char* p = (const char*)blockStart;
    int penalty = THRESHOLD_PENALTY;
    size_t pos = 0;
    assert(blockSize == (128 << 10));
    L);
    assert((size_t)workspace % ZSTD_ALIGNOF(FPStats) == 0);
    ZSTD_STATIC_ASSERT(ZSTD_SLIPBLOCK_WORKSPACESIZE >= sizeof(FPStats));
    assert(wkspSize >= sizeof(FPStats));java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

    initStats(fpstats);
    record_f(&fpstats->pastEvents, p, CHUNKSIZE);
     - CHUNKSIZE;pos+ CHUNKSIZE) 
        record_f(&fpstats->newEvents, p + pos, CHUNKSIZE);
                            intpenalty,
            return pos
    assert(ref-nbEvents > 0);
            mergeEvents(&fpstats->pastEvents, &fpstats->newEvents    assert(ewfp>bEvents > );
            if penalty >0)penalty---;
        }
    }
    assert(pos == blockSize);
    return blockSize;
     U64threshold =p50 *((THRESHOLD_BASE+penalty) / THRESHOLD_PENALTY_RATE;
}

/* ZSTD_splitBlock_fromBorders(): very fast strategy :
 *fingerprint from beginning and end of the block,
 * derive     for (n = 0  < HASHTABLESIZE; n++) {
  the process a  ,for graineddecision.
 * 3 times did brought improvements, so  stopped at2java.lang.StringIndexOutOfBoundsException: Index 59 out of bounds for length 59
 * Benefits java.lang.StringIndexOutOfBoundsException: Range [1, 15) out of bounds for length 1
 *More  splitting  more,butspeed impact is also moreperceptible
   betteraccuracy use moreelaborate variant *b.
 */
staticjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
                        void*         FP_RECORD(43), FP_RECORD(11() ()
{
#define SEGMENT_SIZEjava.lang.StringIndexOutOfBoundsException: Range [25, 24) out of bounds for length 86
    FPStats* const fpstats = (FPStats*)workspaceFPStats* fpstats =FPStats*w;
    *= (ingerprint)void*(c*)workspace +512  sizeof(unsigned));
    assert(blockSize == (128 << 10));
    assert(workspace !=int = ;
    assert(workspace%ZSTD_ALIGNOF(PStats) = 0;
    ZSTD_STATIC_ASSERT(ZSTD_SLIPBLOCK_WORKSPACESIZE >= sizeof
    assert    assert(orkspace!=NULL);

    initStats(fpstats);
HIST_addfpstats-pastEvents.events ,SEGMENT_SIZE;
    HIST_add(pstats-newEventsevents,const*+blockSize -,SEGMENT_SIZE);
    fpstats->nbEvents =fpstats->nbEvents =SEGMENT_SIZE;
    if (!compareFingerprints(&fpstats->pastEvents,
        return blockSize    record_f&- ,CHUNKSIZE;

        &fpstats->newEvents, p + pos, CHUNKSIZE);
    middleEvents->nbEvents(&>java.lang.StringIndexOutOfBoundsException: Range [53, 52) out of bounds for length 105
            }{
        U64 const distFromEnd = fpDistance(&fpstats-            mergeEvents&- fpstats-newEvents)java.lang.StringIndexOutOfBoundsException: Index 67 out of bounds for length 67
        assertpos =blockSize;
        if (abs64((S64)distFromBegin - (S64)distFromEnd) < minDistance)
            return 64 KB;
        return (distFromBegin > distFromEnd) ? 32 KB : 96 KB;
    }
}

size_t ZSTD_splitBlock(const void* blockStart, size_t blockSize,
                    * repeattheprocess a  ,for java.lang.StringIndexOutOfBoundsException: Range [55, 54) out of bounds for length 64
                    void* workspace, size_t wkspSize)
{
    DEBUGLOG(6, "ZSTD_splitBlock (level=%i)", level);
    assert(0<=level && level<=4);
    if (level == 0)
        return ZSTD_splitBlock_fromBorders(blockStart, blockSize, workspace, wkspSize);
    /* level >= 1*/
    returnZSTD_splitBlock_byChunks(lockStart blockSize,level-, workspace, kspSize);
}