308 lines
12 KiB
C++
308 lines
12 KiB
C++
/*
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* Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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#ifndef ZSTD_COMPRESS_H
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#define ZSTD_COMPRESS_H
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/*-*************************************
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* Dependencies
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***************************************/
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#include "zstd_internal.h"
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#ifdef ZSTD_MULTITHREAD
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# include "zstdmt_compress.h"
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#endif
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#if defined (__cplusplus)
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extern "C" {
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#endif
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/*-*************************************
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* Constants
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***************************************/
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static const U32 g_searchStrength = 8;
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#define HASH_READ_SIZE 8
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/*-*************************************
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* Context memory management
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***************************************/
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typedef enum { ZSTDcs_created=0, ZSTDcs_init, ZSTDcs_ongoing, ZSTDcs_ending } ZSTD_compressionStage_e;
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typedef enum { zcss_init=0, zcss_load, zcss_flush } ZSTD_cStreamStage;
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typedef struct ZSTD_prefixDict_s {
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const void* dict;
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size_t dictSize;
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ZSTD_dictMode_e dictMode;
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} ZSTD_prefixDict;
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struct ZSTD_CCtx_s {
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const BYTE* nextSrc; /* next block here to continue on current prefix */
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const BYTE* base; /* All regular indexes relative to this position */
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const BYTE* dictBase; /* extDict indexes relative to this position */
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U32 dictLimit; /* below that point, need extDict */
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U32 lowLimit; /* below that point, no more data */
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U32 nextToUpdate; /* index from which to continue dictionary update */
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U32 nextToUpdate3; /* index from which to continue dictionary update */
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U32 hashLog3; /* dispatch table : larger == faster, more memory */
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U32 loadedDictEnd; /* index of end of dictionary */
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ZSTD_compressionStage_e stage;
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U32 dictID;
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ZSTD_CCtx_params requestedParams;
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ZSTD_CCtx_params appliedParams;
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void* workSpace;
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size_t workSpaceSize;
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size_t blockSize;
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U64 pledgedSrcSizePlusOne; /* this way, 0 (default) == unknown */
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U64 consumedSrcSize;
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XXH64_state_t xxhState;
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ZSTD_customMem customMem;
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size_t staticSize;
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seqStore_t seqStore; /* sequences storage ptrs */
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optState_t optState;
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ldmState_t ldmState; /* long distance matching state */
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U32* hashTable;
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U32* hashTable3;
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U32* chainTable;
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ZSTD_entropyCTables_t* entropy;
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/* streaming */
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char* inBuff;
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size_t inBuffSize;
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size_t inToCompress;
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size_t inBuffPos;
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size_t inBuffTarget;
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char* outBuff;
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size_t outBuffSize;
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size_t outBuffContentSize;
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size_t outBuffFlushedSize;
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ZSTD_cStreamStage streamStage;
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U32 frameEnded;
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/* Dictionary */
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ZSTD_CDict* cdictLocal;
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const ZSTD_CDict* cdict;
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ZSTD_prefixDict prefixDict; /* single-usage dictionary */
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/* Multi-threading */
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#ifdef ZSTD_MULTITHREAD
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ZSTDMT_CCtx* mtctx;
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#endif
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};
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static const BYTE LL_Code[64] = { 0, 1, 2, 3, 4, 5, 6, 7,
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8, 9, 10, 11, 12, 13, 14, 15,
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16, 16, 17, 17, 18, 18, 19, 19,
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20, 20, 20, 20, 21, 21, 21, 21,
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22, 22, 22, 22, 22, 22, 22, 22,
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23, 23, 23, 23, 23, 23, 23, 23,
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24, 24, 24, 24, 24, 24, 24, 24,
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24, 24, 24, 24, 24, 24, 24, 24 };
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static const BYTE ML_Code[128] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
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16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
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32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 36, 36, 37, 37, 37, 37,
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38, 38, 38, 38, 38, 38, 38, 38, 39, 39, 39, 39, 39, 39, 39, 39,
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40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40,
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41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41,
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42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42,
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42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42 };
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/*! ZSTD_storeSeq() :
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Store a sequence (literal length, literals, offset code and match length code) into seqStore_t.
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`offsetCode` : distance to match, or 0 == repCode.
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`matchCode` : matchLength - MINMATCH
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*/
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MEM_STATIC void ZSTD_storeSeq(seqStore_t* seqStorePtr, size_t litLength, const void* literals, U32 offsetCode, size_t matchCode)
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{
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#if defined(ZSTD_DEBUG) && (ZSTD_DEBUG >= 6)
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static const BYTE* g_start = NULL;
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U32 const pos = (U32)((const BYTE*)literals - g_start);
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if (g_start==NULL) g_start = (const BYTE*)literals;
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if ((pos > 0) && (pos < 1000000000))
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DEBUGLOG(6, "Cpos %6u :%5u literals & match %3u bytes at distance %6u",
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pos, (U32)litLength, (U32)matchCode+MINMATCH, (U32)offsetCode);
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#endif
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/* copy Literals */
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assert(seqStorePtr->lit + litLength <= seqStorePtr->litStart + 128 KB);
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ZSTD_wildcopy(seqStorePtr->lit, literals, litLength);
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seqStorePtr->lit += litLength;
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/* literal Length */
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if (litLength>0xFFFF) {
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seqStorePtr->longLengthID = 1;
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seqStorePtr->longLengthPos = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
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}
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seqStorePtr->sequences[0].litLength = (U16)litLength;
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/* match offset */
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seqStorePtr->sequences[0].offset = offsetCode + 1;
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/* match Length */
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if (matchCode>0xFFFF) {
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seqStorePtr->longLengthID = 2;
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seqStorePtr->longLengthPos = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
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}
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seqStorePtr->sequences[0].matchLength = (U16)matchCode;
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seqStorePtr->sequences++;
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}
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/*-*************************************
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* Match length counter
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***************************************/
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static unsigned ZSTD_NbCommonBytes (register size_t val)
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{
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if (MEM_isLittleEndian()) {
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if (MEM_64bits()) {
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# if defined(_MSC_VER) && defined(_WIN64)
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unsigned long r = 0;
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_BitScanForward64( &r, (U64)val );
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return (unsigned)(r>>3);
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# elif defined(__GNUC__) && (__GNUC__ >= 4)
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return (__builtin_ctzll((U64)val) >> 3);
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# else
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static const int DeBruijnBytePos[64] = { 0, 0, 0, 0, 0, 1, 1, 2,
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0, 3, 1, 3, 1, 4, 2, 7,
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0, 2, 3, 6, 1, 5, 3, 5,
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1, 3, 4, 4, 2, 5, 6, 7,
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7, 0, 1, 2, 3, 3, 4, 6,
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2, 6, 5, 5, 3, 4, 5, 6,
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7, 1, 2, 4, 6, 4, 4, 5,
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7, 2, 6, 5, 7, 6, 7, 7 };
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return DeBruijnBytePos[((U64)((val & -(long long)val) * 0x0218A392CDABBD3FULL)) >> 58];
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# endif
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} else { /* 32 bits */
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# if defined(_MSC_VER)
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unsigned long r=0;
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_BitScanForward( &r, (U32)val );
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return (unsigned)(r>>3);
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# elif defined(__GNUC__) && (__GNUC__ >= 3)
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return (__builtin_ctz((U32)val) >> 3);
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# else
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static const int DeBruijnBytePos[32] = { 0, 0, 3, 0, 3, 1, 3, 0,
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3, 2, 2, 1, 3, 2, 0, 1,
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3, 3, 1, 2, 2, 2, 2, 0,
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3, 1, 2, 0, 1, 0, 1, 1 };
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return DeBruijnBytePos[((U32)((val & -(S32)val) * 0x077CB531U)) >> 27];
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# endif
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}
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} else { /* Big Endian CPU */
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if (MEM_64bits()) {
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# if defined(_MSC_VER) && defined(_WIN64)
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unsigned long r = 0;
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_BitScanReverse64( &r, val );
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return (unsigned)(r>>3);
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# elif defined(__GNUC__) && (__GNUC__ >= 4)
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return (__builtin_clzll(val) >> 3);
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# else
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unsigned r;
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const unsigned n32 = sizeof(size_t)*4; /* calculate this way due to compiler complaining in 32-bits mode */
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if (!(val>>n32)) { r=4; } else { r=0; val>>=n32; }
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if (!(val>>16)) { r+=2; val>>=8; } else { val>>=24; }
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r += (!val);
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return r;
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# endif
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} else { /* 32 bits */
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# if defined(_MSC_VER)
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unsigned long r = 0;
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_BitScanReverse( &r, (unsigned long)val );
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return (unsigned)(r>>3);
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# elif defined(__GNUC__) && (__GNUC__ >= 3)
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return (__builtin_clz((U32)val) >> 3);
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# else
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unsigned r;
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if (!(val>>16)) { r=2; val>>=8; } else { r=0; val>>=24; }
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r += (!val);
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return r;
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# endif
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} }
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}
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MEM_STATIC size_t ZSTD_count(const BYTE* pIn, const BYTE* pMatch, const BYTE* const pInLimit)
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{
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const BYTE* const pStart = pIn;
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const BYTE* const pInLoopLimit = pInLimit - (sizeof(size_t)-1);
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while (pIn < pInLoopLimit) {
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size_t const diff = MEM_readST(pMatch) ^ MEM_readST(pIn);
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if (!diff) { pIn+=sizeof(size_t); pMatch+=sizeof(size_t); continue; }
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pIn += ZSTD_NbCommonBytes(diff);
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return (size_t)(pIn - pStart);
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}
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if (MEM_64bits()) if ((pIn<(pInLimit-3)) && (MEM_read32(pMatch) == MEM_read32(pIn))) { pIn+=4; pMatch+=4; }
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if ((pIn<(pInLimit-1)) && (MEM_read16(pMatch) == MEM_read16(pIn))) { pIn+=2; pMatch+=2; }
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if ((pIn<pInLimit) && (*pMatch == *pIn)) pIn++;
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return (size_t)(pIn - pStart);
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}
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/** ZSTD_count_2segments() :
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* can count match length with `ip` & `match` in 2 different segments.
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* convention : on reaching mEnd, match count continue starting from iStart
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*/
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MEM_STATIC size_t ZSTD_count_2segments(const BYTE* ip, const BYTE* match, const BYTE* iEnd, const BYTE* mEnd, const BYTE* iStart)
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{
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const BYTE* const vEnd = MIN( ip + (mEnd - match), iEnd);
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size_t const matchLength = ZSTD_count(ip, match, vEnd);
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if (match + matchLength != mEnd) return matchLength;
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return matchLength + ZSTD_count(ip+matchLength, iStart, iEnd);
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}
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/*-*************************************
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* Hashes
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***************************************/
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static const U32 prime3bytes = 506832829U;
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static U32 ZSTD_hash3(U32 u, U32 h) { return ((u << (32-24)) * prime3bytes) >> (32-h) ; }
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MEM_STATIC size_t ZSTD_hash3Ptr(const void* ptr, U32 h) { return ZSTD_hash3(MEM_readLE32(ptr), h); } /* only in zstd_opt.h */
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static const U32 prime4bytes = 2654435761U;
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static U32 ZSTD_hash4(U32 u, U32 h) { return (u * prime4bytes) >> (32-h) ; }
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static size_t ZSTD_hash4Ptr(const void* ptr, U32 h) { return ZSTD_hash4(MEM_read32(ptr), h); }
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static const U64 prime5bytes = 889523592379ULL;
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static size_t ZSTD_hash5(U64 u, U32 h) { return (size_t)(((u << (64-40)) * prime5bytes) >> (64-h)) ; }
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static size_t ZSTD_hash5Ptr(const void* p, U32 h) { return ZSTD_hash5(MEM_readLE64(p), h); }
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static const U64 prime6bytes = 227718039650203ULL;
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static size_t ZSTD_hash6(U64 u, U32 h) { return (size_t)(((u << (64-48)) * prime6bytes) >> (64-h)) ; }
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static size_t ZSTD_hash6Ptr(const void* p, U32 h) { return ZSTD_hash6(MEM_readLE64(p), h); }
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static const U64 prime7bytes = 58295818150454627ULL;
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static size_t ZSTD_hash7(U64 u, U32 h) { return (size_t)(((u << (64-56)) * prime7bytes) >> (64-h)) ; }
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static size_t ZSTD_hash7Ptr(const void* p, U32 h) { return ZSTD_hash7(MEM_readLE64(p), h); }
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static const U64 prime8bytes = 0xCF1BBCDCB7A56463ULL;
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static size_t ZSTD_hash8(U64 u, U32 h) { return (size_t)(((u) * prime8bytes) >> (64-h)) ; }
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static size_t ZSTD_hash8Ptr(const void* p, U32 h) { return ZSTD_hash8(MEM_readLE64(p), h); }
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MEM_STATIC size_t ZSTD_hashPtr(const void* p, U32 hBits, U32 mls)
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{
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switch(mls)
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{
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default:
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case 4: return ZSTD_hash4Ptr(p, hBits);
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case 5: return ZSTD_hash5Ptr(p, hBits);
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case 6: return ZSTD_hash6Ptr(p, hBits);
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case 7: return ZSTD_hash7Ptr(p, hBits);
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case 8: return ZSTD_hash8Ptr(p, hBits);
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}
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}
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#if defined (__cplusplus)
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}
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#endif
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#endif /* ZSTD_COMPRESS_H */
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