cregit-Linux how code gets into the kernel

Release 4.16 lib/zstd/compress.c

Directory: lib/zstd
/**
 * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of https://github.com/facebook/zstd.
 * An additional grant of patent rights can be found in the PATENTS file in the
 * same directory.
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License version 2 as published by the
 * Free Software Foundation. This program is dual-licensed; you may select
 * either version 2 of the GNU General Public License ("GPL") or BSD license
 * ("BSD").
 */

/*-*************************************
*  Dependencies
***************************************/
#include "fse.h"
#include "huf.h"
#include "mem.h"
#include "zstd_internal.h" /* includes zstd.h */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h> /* memset */

/*-*************************************
*  Constants
***************************************/

static const U32 g_searchStrength = 8; 
/* control skip over incompressible data */

#define HASH_READ_SIZE 8






typedef enum { ZSTDcs_created = 0, ZSTDcs_init, ZSTDcs_ongoing, ZSTDcs_ending } ZSTD_compressionStage_e;

/*-*************************************
*  Helper functions
***************************************/

size_t ZSTD_compressBound(size_t srcSize) { return FSE_compressBound(srcSize) + 12; }

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/*-************************************* * Sequence storage ***************************************/
static void ZSTD_resetSeqStore(seqStore_t *ssPtr) { ssPtr->lit = ssPtr->litStart; ssPtr->sequences = ssPtr->sequencesStart; ssPtr->longLengthID = 0; }

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/*-************************************* * Context memory management ***************************************/ struct ZSTD_CCtx_s { const BYTE *nextSrc; /* next block here to continue on curr prefix */ const BYTE *base; /* All regular indexes relative to this position */ const BYTE *dictBase; /* extDict indexes relative to this position */ U32 dictLimit; /* below that point, need extDict */ U32 lowLimit; /* below that point, no more data */ U32 nextToUpdate; /* index from which to continue dictionary update */ U32 nextToUpdate3; /* index from which to continue dictionary update */ U32 hashLog3; /* dispatch table : larger == faster, more memory */ U32 loadedDictEnd; /* index of end of dictionary */ U32 forceWindow; /* force back-references to respect limit of 1<<wLog, even for dictionary */ U32 forceRawDict; /* Force loading dictionary in "content-only" mode (no header analysis) */ ZSTD_compressionStage_e stage; U32 rep[ZSTD_REP_NUM]; U32 repToConfirm[ZSTD_REP_NUM]; U32 dictID; ZSTD_parameters params; void *workSpace; size_t workSpaceSize; size_t blockSize; U64 frameContentSize; struct xxh64_state xxhState; ZSTD_customMem customMem; seqStore_t seqStore; /* sequences storage ptrs */ U32 *hashTable; U32 *hashTable3; U32 *chainTable; HUF_CElt *hufTable; U32 flagStaticTables; HUF_repeat flagStaticHufTable; FSE_CTable offcodeCTable[FSE_CTABLE_SIZE_U32(OffFSELog, MaxOff)]; FSE_CTable matchlengthCTable[FSE_CTABLE_SIZE_U32(MLFSELog, MaxML)]; FSE_CTable litlengthCTable[FSE_CTABLE_SIZE_U32(LLFSELog, MaxLL)]; unsigned tmpCounters[HUF_COMPRESS_WORKSPACE_SIZE_U32]; };
size_t ZSTD_CCtxWorkspaceBound(ZSTD_compressionParameters cParams) { size_t const blockSize = MIN(ZSTD_BLOCKSIZE_ABSOLUTEMAX, (size_t)1 << cParams.windowLog); U32 const divider = (cParams.searchLength == 3) ? 3 : 4; size_t const maxNbSeq = blockSize / divider; size_t const tokenSpace = blockSize + 11 * maxNbSeq; size_t const chainSize = (cParams.strategy == ZSTD_fast) ? 0 : (1 << cParams.chainLog); size_t const hSize = ((size_t)1) << cParams.hashLog; U32 const hashLog3 = (cParams.searchLength > 3) ? 0 : MIN(ZSTD_HASHLOG3_MAX, cParams.windowLog); size_t const h3Size = ((size_t)1) << hashLog3; size_t const tableSpace = (chainSize + hSize + h3Size) * sizeof(U32); size_t const optSpace = ((MaxML + 1) + (MaxLL + 1) + (MaxOff + 1) + (1 << Litbits)) * sizeof(U32) + (ZSTD_OPT_NUM + 1) * (sizeof(ZSTD_match_t) + sizeof(ZSTD_optimal_t)); size_t const workspaceSize = tableSpace + (256 * sizeof(U32)) /* huffTable */ + tokenSpace + (((cParams.strategy == ZSTD_btopt) || (cParams.strategy == ZSTD_btopt2)) ? optSpace : 0); return ZSTD_ALIGN(sizeof(ZSTD_stack)) + ZSTD_ALIGN(sizeof(ZSTD_CCtx)) + ZSTD_ALIGN(workspaceSize); }

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static ZSTD_CCtx *ZSTD_createCCtx_advanced(ZSTD_customMem customMem) { ZSTD_CCtx *cctx; if (!customMem.customAlloc || !customMem.customFree) return NULL; cctx = (ZSTD_CCtx *)ZSTD_malloc(sizeof(ZSTD_CCtx), customMem); if (!cctx) return NULL; memset(cctx, 0, sizeof(ZSTD_CCtx)); cctx->customMem = customMem; return cctx; }

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ZSTD_CCtx *ZSTD_initCCtx(void *workspace, size_t workspaceSize) { ZSTD_customMem const stackMem = ZSTD_initStack(workspace, workspaceSize); ZSTD_CCtx *cctx = ZSTD_createCCtx_advanced(stackMem); if (cctx) { cctx->workSpace = ZSTD_stackAllocAll(cctx->customMem.opaque, &cctx->workSpaceSize); } return cctx; }

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size_t ZSTD_freeCCtx(ZSTD_CCtx *cctx) { if (cctx == NULL) return 0; /* support free on NULL */ ZSTD_free(cctx->workSpace, cctx->customMem); ZSTD_free(cctx, cctx->customMem); return 0; /* reserved as a potential error code in the future */ }

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const seqStore_t *ZSTD_getSeqStore(const ZSTD_CCtx *ctx) /* hidden interface */ { return &(ctx->seqStore); }

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static ZSTD_parameters ZSTD_getParamsFromCCtx(const ZSTD_CCtx *cctx) { return cctx->params; }

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/** ZSTD_checkParams() : ensure param values remain within authorized range. @return : 0, or an error code if one value is beyond authorized range */
size_t ZSTD_checkCParams(ZSTD_compressionParameters cParams) { #define CLAMPCHECK(val, min, max) \ { \ if ((val < min) | (val > max)) \ return ERROR(compressionParameter_unsupported); \ } CLAMPCHECK(cParams.windowLog, ZSTD_WINDOWLOG_MIN, ZSTD_WINDOWLOG_MAX); CLAMPCHECK(cParams.chainLog, ZSTD_CHAINLOG_MIN, ZSTD_CHAINLOG_MAX); CLAMPCHECK(cParams.hashLog, ZSTD_HASHLOG_MIN, ZSTD_HASHLOG_MAX); CLAMPCHECK(cParams.searchLog, ZSTD_SEARCHLOG_MIN, ZSTD_SEARCHLOG_MAX); CLAMPCHECK(cParams.searchLength, ZSTD_SEARCHLENGTH_MIN, ZSTD_SEARCHLENGTH_MAX); CLAMPCHECK(cParams.targetLength, ZSTD_TARGETLENGTH_MIN, ZSTD_TARGETLENGTH_MAX); if ((U32)(cParams.strategy) > (U32)ZSTD_btopt2) return ERROR(compressionParameter_unsupported); return 0; }

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/** ZSTD_cycleLog() : * condition for correct operation : hashLog > 1 */
static U32 ZSTD_cycleLog(U32 hashLog, ZSTD_strategy strat) { U32 const btScale = ((U32)strat >= (U32)ZSTD_btlazy2); return hashLog - btScale; }

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/** ZSTD_adjustCParams() : optimize `cPar` for a given input (`srcSize` and `dictSize`). mostly downsizing to reduce memory consumption and initialization. Both `srcSize` and `dictSize` are optional (use 0 if unknown), but if both are 0, no optimization can be done. Note : cPar is considered validated at this stage. Use ZSTD_checkParams() to ensure that. */
ZSTD_compressionParameters ZSTD_adjustCParams(ZSTD_compressionParameters cPar, unsigned long long srcSize, size_t dictSize) { if (srcSize + dictSize == 0) return cPar; /* no size information available : no adjustment */ /* resize params, to use less memory when necessary */ { U32 const minSrcSize = (srcSize == 0) ? 500 : 0; U64 const rSize = srcSize + dictSize + minSrcSize; if (rSize < ((U64)1 << ZSTD_WINDOWLOG_MAX)) { U32 const srcLog = MAX(ZSTD_HASHLOG_MIN, ZSTD_highbit32((U32)(rSize)-1) + 1); if (cPar.windowLog > srcLog) cPar.windowLog = srcLog; } } if (cPar.hashLog > cPar.windowLog) cPar.hashLog = cPar.windowLog; { U32 const cycleLog = ZSTD_cycleLog(cPar.chainLog, cPar.strategy); if (cycleLog > cPar.windowLog) cPar.chainLog -= (cycleLog - cPar.windowLog); } if (cPar.windowLog < ZSTD_WINDOWLOG_ABSOLUTEMIN) cPar.windowLog = ZSTD_WINDOWLOG_ABSOLUTEMIN; /* required for frame header */ return cPar; }

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static U32 ZSTD_equivalentParams(ZSTD_parameters param1, ZSTD_parameters param2) { return (param1.cParams.hashLog == param2.cParams.hashLog) & (param1.cParams.chainLog == param2.cParams.chainLog) & (param1.cParams.strategy == param2.cParams.strategy) & ((param1.cParams.searchLength == 3) == (param2.cParams.searchLength == 3)); }

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/*! ZSTD_continueCCtx() : reuse CCtx without reset (note : requires no dictionary) */
static size_t ZSTD_continueCCtx(ZSTD_CCtx *cctx, ZSTD_parameters params, U64 frameContentSize) { U32 const end = (U32)(cctx->nextSrc - cctx->base); cctx->params = params; cctx->frameContentSize = frameContentSize; cctx->lowLimit = end; cctx->dictLimit = end; cctx->nextToUpdate = end + 1; cctx->stage = ZSTDcs_init; cctx->dictID = 0; cctx->loadedDictEnd = 0; { int i; for (i = 0; i < ZSTD_REP_NUM; i++) cctx->rep[i] = repStartValue[i]; } cctx->seqStore.litLengthSum = 0; /* force reset of btopt stats */ xxh64_reset(&cctx->xxhState, 0); return 0; }

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typedef enum { ZSTDcrp_continue, ZSTDcrp_noMemset, ZSTDcrp_fullReset } ZSTD_compResetPolicy_e; /*! ZSTD_resetCCtx_advanced() : note : `params` must be validated */
static size_t ZSTD_resetCCtx_advanced(ZSTD_CCtx *zc, ZSTD_parameters params, U64 frameContentSize, ZSTD_compResetPolicy_e const crp) { if (crp == ZSTDcrp_continue) if (ZSTD_equivalentParams(params, zc->params)) { zc->flagStaticTables = 0; zc->flagStaticHufTable = HUF_repeat_none; return ZSTD_continueCCtx(zc, params, frameContentSize); } { size_t const blockSize = MIN(ZSTD_BLOCKSIZE_ABSOLUTEMAX, (size_t)1 << params.cParams.windowLog); U32 const divider = (params.cParams.searchLength == 3) ? 3 : 4; size_t const maxNbSeq = blockSize / divider; size_t const tokenSpace = blockSize + 11 * maxNbSeq; size_t const chainSize = (params.cParams.strategy == ZSTD_fast) ? 0 : (1 << params.cParams.chainLog); size_t const hSize = ((size_t)1) << params.cParams.hashLog; U32 const hashLog3 = (params.cParams.searchLength > 3) ? 0 : MIN(ZSTD_HASHLOG3_MAX, params.cParams.windowLog); size_t const h3Size = ((size_t)1) << hashLog3; size_t const tableSpace = (chainSize + hSize + h3Size) * sizeof(U32); void *ptr; /* Check if workSpace is large enough, alloc a new one if needed */ { size_t const optSpace = ((MaxML + 1) + (MaxLL + 1) + (MaxOff + 1) + (1 << Litbits)) * sizeof(U32) + (ZSTD_OPT_NUM + 1) * (sizeof(ZSTD_match_t) + sizeof(ZSTD_optimal_t)); size_t const neededSpace = tableSpace + (256 * sizeof(U32)) /* huffTable */ + tokenSpace + (((params.cParams.strategy == ZSTD_btopt) || (params.cParams.strategy == ZSTD_btopt2)) ? optSpace : 0); if (zc->workSpaceSize < neededSpace) { ZSTD_free(zc->workSpace, zc->customMem); zc->workSpace = ZSTD_malloc(neededSpace, zc->customMem); if (zc->workSpace == NULL) return ERROR(memory_allocation); zc->workSpaceSize = neededSpace; } } if (crp != ZSTDcrp_noMemset) memset(zc->workSpace, 0, tableSpace); /* reset tables only */ xxh64_reset(&zc->xxhState, 0); zc->hashLog3 = hashLog3; zc->hashTable = (U32 *)(zc->workSpace); zc->chainTable = zc->hashTable + hSize; zc->hashTable3 = zc->chainTable + chainSize; ptr = zc->hashTable3 + h3Size; zc->hufTable = (HUF_CElt *)ptr; zc->flagStaticTables = 0; zc->flagStaticHufTable = HUF_repeat_none; ptr = ((U32 *)ptr) + 256; /* note : HUF_CElt* is incomplete type, size is simulated using U32 */ zc->nextToUpdate = 1; zc->nextSrc = NULL; zc->base = NULL; zc->dictBase = NULL; zc->dictLimit = 0; zc->lowLimit = 0; zc->params = params; zc->blockSize = blockSize; zc->frameContentSize = frameContentSize; { int i; for (i = 0; i < ZSTD_REP_NUM; i++) zc->rep[i] = repStartValue[i]; } if ((params.cParams.strategy == ZSTD_btopt) || (params.cParams.strategy == ZSTD_btopt2)) { zc->seqStore.litFreq = (U32 *)ptr; zc->seqStore.litLengthFreq = zc->seqStore.litFreq + (1 << Litbits); zc->seqStore.matchLengthFreq = zc->seqStore.litLengthFreq + (MaxLL + 1); zc->seqStore.offCodeFreq = zc->seqStore.matchLengthFreq + (MaxML + 1); ptr = zc->seqStore.offCodeFreq + (MaxOff + 1); zc->seqStore.matchTable = (ZSTD_match_t *)ptr; ptr = zc->seqStore.matchTable + ZSTD_OPT_NUM + 1; zc->seqStore.priceTable = (ZSTD_optimal_t *)ptr; ptr = zc->seqStore.priceTable + ZSTD_OPT_NUM + 1; zc->seqStore.litLengthSum = 0; } zc->seqStore.sequencesStart = (seqDef *)ptr; ptr = zc->seqStore.sequencesStart + maxNbSeq; zc->seqStore.llCode = (BYTE *)ptr; zc->seqStore.mlCode = zc->seqStore.llCode + maxNbSeq; zc->seqStore.ofCode = zc->seqStore.mlCode + maxNbSeq; zc->seqStore.litStart = zc->seqStore.ofCode + maxNbSeq; zc->stage = ZSTDcs_init; zc->dictID = 0; zc->loadedDictEnd = 0; return 0; } }

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/* 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) { int i; for (i = 0; i < ZSTD_REP_NUM; i++) cctx->rep[i] = 0; }

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/*! ZSTD_copyCCtx() : * Duplicate an existing context `srcCCtx` into another one `dstCCtx`. * Only works during stage ZSTDcs_init (i.e. after creation, but before first call to ZSTD_compressContinue()). * @return : 0, or an error code */
size_t ZSTD_copyCCtx(ZSTD_CCtx *dstCCtx, const ZSTD_CCtx *srcCCtx, unsigned long long pledgedSrcSize) { if (srcCCtx->stage != ZSTDcs_init) return ERROR(stage_wrong); memcpy(&dstCCtx->customMem, &srcCCtx->customMem, sizeof(ZSTD_customMem)); { ZSTD_parameters params = srcCCtx->params; params.fParams.contentSizeFlag = (pledgedSrcSize > 0); ZSTD_resetCCtx_advanced(dstCCtx, params, pledgedSrcSize, ZSTDcrp_noMemset); } /* copy tables */ { size_t const chainSize = (srcCCtx->params.cParams.strategy == ZSTD_fast) ? 0 : (1 << srcCCtx->params.cParams.chainLog); size_t const hSize = ((size_t)1) << srcCCtx->params.cParams.hashLog; size_t const h3Size = (size_t)1 << srcCCtx->hashLog3; size_t const tableSpace = (chainSize + hSize + h3Size) * sizeof(U32); memcpy(dstCCtx->workSpace, srcCCtx->workSpace, tableSpace); } /* copy dictionary offsets */ dstCCtx->nextToUpdate = srcCCtx->nextToUpdate; dstCCtx->nextToUpdate3 = srcCCtx->nextToUpdate3; dstCCtx->nextSrc = srcCCtx->nextSrc; dstCCtx->base = srcCCtx->base; dstCCtx->dictBase = srcCCtx->dictBase; dstCCtx->dictLimit = srcCCtx->dictLimit; dstCCtx->lowLimit = srcCCtx->lowLimit; dstCCtx->loadedDictEnd = srcCCtx->loadedDictEnd; dstCCtx->dictID = srcCCtx->dictID; /* copy entropy tables */ dstCCtx->flagStaticTables = srcCCtx->flagStaticTables; dstCCtx->flagStaticHufTable = srcCCtx->flagStaticHufTable; if (srcCCtx->flagStaticTables) { memcpy(dstCCtx->litlengthCTable, srcCCtx->litlengthCTable, sizeof(dstCCtx->litlengthCTable)); memcpy(dstCCtx->matchlengthCTable, srcCCtx->matchlengthCTable, sizeof(dstCCtx->matchlengthCTable)); memcpy(dstCCtx->offcodeCTable, srcCCtx->offcodeCTable, sizeof(dstCCtx->offcodeCTable)); } if (srcCCtx->flagStaticHufTable) { memcpy(dstCCtx->hufTable, srcCCtx->hufTable, 256 * 4); } return 0; }

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/*! ZSTD_reduceTable() : * reduce table indexes by `reducerValue` */
static void ZSTD_reduceTable(U32 *const table, U32 const size, U32 const reducerValue) { U32 u; for (u = 0; u < size; u++) { if (table[u] < reducerValue) table[u] = 0; else table[u] -= reducerValue; } }

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/*! ZSTD_reduceIndex() : * rescale all indexes to avoid future overflow (indexes are U32) */
static void ZSTD_reduceIndex(ZSTD_CCtx *zc, const U32 reducerValue) { { U32 const hSize = 1 << zc->params.cParams.hashLog; ZSTD_reduceTable(zc->hashTable, hSize, reducerValue); } { U32 const chainSize = (zc->params.cParams.strategy == ZSTD_fast) ? 0 : (1 << zc->params.cParams.chainLog); ZSTD_reduceTable(zc->chainTable, chainSize, reducerValue); } { U32 const h3Size = (zc->hashLog3) ? 1 << zc->hashLog3 : 0; ZSTD_reduceTable(zc->hashTable3, h3Size, reducerValue); } }

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/*-******************************************************* * Block entropic compression *********************************************************/ /* See doc/zstd_compression_format.md for detailed format description */
size_t ZSTD_noCompressBlock(void *dst, size_t dstCapacity, const void *src, size_t srcSize) { if (srcSize + ZSTD_blockHeaderSize > dstCapacity) return ERROR(dstSize_tooSmall); memcpy((BYTE *)dst + ZSTD_blockHeaderSize, src, srcSize); ZSTD_writeLE24(dst, (U32)(srcSize << 2) + (U32)bt_raw); return ZSTD_blockHeaderSize + srcSize; }

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static size_t ZSTD_noCompressLiterals(void *dst, size_t dstCapacity, const void *src, size_t srcSize) { BYTE *const ostart = (BYTE * const)dst; U32 const flSize = 1 + (srcSize > 31) + (srcSize > 4095); if (srcSize + flSize > dstCapacity) return ERROR(dstSize_tooSmall); switch (flSize) { case 1: /* 2 - 1 - 5 */ ostart[0] = (BYTE)((U32)set_basic + (srcSize << 3)); break; case 2: /* 2 - 2 - 12 */ ZSTD_writeLE16(ostart, (U16)((U32)set_basic + (1 << 2) + (srcSize << 4))); break; default: /*note : should not be necessary : flSize is within {1,2,3} */ case 3: /* 2 - 2 - 20 */ ZSTD_writeLE32(ostart, (U32)((U32)set_basic + (3 << 2) + (srcSize << 4))); break; } memcpy(ostart + flSize, src, srcSize); return srcSize + flSize; }

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static size_t ZSTD_compressRleLiteralsBlock(void *dst, size_t dstCapacity, const void *src, size_t srcSize) { BYTE *const ostart = (BYTE * const)dst; U32 const flSize = 1 + (srcSize > 31) + (srcSize > 4095); (void)dstCapacity; /* dstCapacity already guaranteed to be >=4, hence large enough */ switch (flSize) { case 1: /* 2 - 1 - 5 */ ostart[0] = (BYTE)((U32)set_rle + (srcSize << 3)); break; case 2: /* 2 - 2 - 12 */ ZSTD_writeLE16(ostart, (U16)((U32)set_rle + (1 << 2) + (srcSize << 4))); break; default: /*note : should not be necessary : flSize is necessarily within {1,2,3} */ case 3: /* 2 - 2 - 20 */ ZSTD_writeLE32(ostart, (U32)((U32)set_rle + (3 << 2) + (srcSize << 4))); break; } ostart[flSize] = *(const BYTE *)src; return flSize + 1; }

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static size_t ZSTD_minGain(size_t srcSize) { return (srcSize >> 6) + 2; }

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static size_t ZSTD_compressLiterals(ZSTD_CCtx *zc, void *dst, size_t dstCapacity, const void *src, size_t srcSize) { size_t const minGain = ZSTD_minGain(srcSize); size_t const lhSize = 3 + (srcSize >= 1 KB) + (srcSize >= 16 KB); BYTE *const ostart = (BYTE *)dst; U32 singleStream = srcSize < 256; symbolEncodingType_e hType = set_compressed; size_t cLitSize; /* small ? don't even attempt compression (speed opt) */ #define LITERAL_NOENTROPY 63 { size_t const minLitSize = zc->flagStaticHufTable == HUF_repeat_valid ? 6 : LITERAL_NOENTROPY; if (srcSize <= minLitSize) return ZSTD_noCompressLiterals(dst, dstCapacity, src, srcSize); } if (dstCapacity < lhSize + 1) return ERROR(dstSize_tooSmall); /* not enough space for compression */ { HUF_repeat repeat = zc->flagStaticHufTable; int const preferRepeat = zc->params.cParams.strategy < ZSTD_lazy ? srcSize <= 1024 : 0; if (repeat == HUF_repeat_valid && lhSize == 3) singleStream = 1; cLitSize = singleStream ? HUF_compress1X_repeat(ostart + lhSize, dstCapacity - lhSize, src, srcSize, 255, 11, zc->tmpCounters, sizeof(zc->tmpCounters), zc->hufTable, &repeat, preferRepeat) : HUF_compress4X_repeat(ostart + lhSize, dstCapacity - lhSize, src, srcSize, 255, 11, zc->tmpCounters, sizeof(zc->tmpCounters), zc->hufTable, &repeat, preferRepeat); if (repeat != HUF_repeat_none) { hType = set_repeat; } /* reused the existing table */ else { zc->flagStaticHufTable = HUF_repeat_check; } /* now have a table to reuse */ } if ((cLitSize == 0) | (cLitSize >= srcSize - minGain)) { zc->flagStaticHufTable = HUF_repeat_none; return ZSTD_noCompressLiterals(dst, dstCapacity, src, srcSize); } if (cLitSize == 1) { zc->flagStaticHufTable = HUF_repeat_none; return ZSTD_compressRleLiteralsBlock(dst, dstCapacity, src, srcSize); } /* Build header */ switch (lhSize) { case 3: /* 2 - 2 - 10 - 10 */ { U32 const lhc = hType + ((!singleStream) << 2) + ((U32)srcSize << 4) + ((U32)cLitSize << 14); ZSTD_writeLE24(ostart, lhc); break; } case 4: /* 2 - 2 - 14 - 14 */ { U32 const lhc = hType + (2 << 2) + ((U32)srcSize << 4) + ((U32)cLitSize << 18); ZSTD_writeLE32(ostart, lhc); break; } default: /* should not be necessary, lhSize is only {3,4,5} */ case 5: /* 2 - 2 - 18 - 18 */ { U32 const lhc = hType + (3 << 2) + ((U32)srcSize << 4) + ((U32)cLitSize << 22); ZSTD_writeLE32(ostart, lhc); ostart[4] = (BYTE)(cLitSize >> 10); break; } } return lhSize + cLitSize; }

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static const BYTE LL_Code[64] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 22, 22, 23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24}; static const BYTE ML_Code[128] = {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, 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 36, 36, 37, 37, 37, 37, 38, 38, 38, 38, 38, 38, 38, 38, 39, 39, 39, 39, 39, 39, 39, 39, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42};
void ZSTD_seqToCodes(const seqStore_t *seqStorePtr) { BYTE const LL_deltaCode = 19; BYTE const ML_deltaCode = 36; const seqDef *const sequences = seqStorePtr->sequencesStart; BYTE *const llCodeTable = seqStorePtr->llCode; BYTE *const ofCodeTable = seqStorePtr->ofCode; BYTE *const mlCodeTable = seqStorePtr->mlCode; U32 const nbSeq = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart); U32 u; for (u = 0; u < nbSeq; u++) { U32 const llv = sequences[u].litLength; U32 const mlv = sequences[u].matchLength; llCodeTable[u] = (llv > 63) ? (BYTE)ZSTD_highbit32(llv) + LL_deltaCode : LL_Code[llv]; ofCodeTable[u] = (BYTE)ZSTD_highbit32(sequences[u].offset); mlCodeTable[u] = (mlv > 127) ? (BYTE)ZSTD_highbit32(mlv) + ML_deltaCode : ML_Code[mlv]; } if (seqStorePtr->longLengthID == 1) llCodeTable[seqStorePtr->longLengthPos] = MaxLL; if (seqStorePtr->longLengthID == 2) mlCodeTable[seqStorePtr->longLengthPos] = MaxML; }

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ZSTD_STATIC size_t ZSTD_compressSequences_internal(ZSTD_CCtx *zc, void *dst, size_t dstCapacity) { const int longOffsets = zc->params.cParams.windowLog > STREAM_ACCUMULATOR_MIN; const seqStore_t *seqStorePtr = &(zc->seqStore); FSE_CTable *CTable_LitLength = zc->litlengthCTable; FSE_CTable *CTable_OffsetBits = zc->offcodeCTable; FSE_CTable *CTable_MatchLength = zc->matchlengthCTable; U32 LLtype, Offtype, MLtype; /* compressed, raw or rle */ const seqDef *const sequences = seqStorePtr->sequencesStart; const BYTE *const ofCodeTable = seqStorePtr->ofCode; const BYTE *const llCodeTable = seqStorePtr->llCode; const BYTE *const mlCodeTable = seqStorePtr->mlCode; BYTE *const ostart = (BYTE *)dst; BYTE *const oend = ostart + dstCapacity; BYTE *op = ostart; size_t const nbSeq = seqStorePtr->sequences - seqStorePtr->sequencesStart; BYTE *seqHead; U32 *count; S16 *norm; U32 *workspace; size_t workspaceSize = sizeof(zc->tmpCounters); { size_t spaceUsed32 = 0; count = (U32 *)zc->tmpCounters + spaceUsed32; spaceUsed32 += MaxSeq + 1; norm = (S16 *)((U32 *)zc->tmpCounters + spaceUsed32); spaceUsed32 += ALIGN(sizeof(S16) * (MaxSeq + 1), sizeof(U32)) >> 2; workspace = (U32 *)zc->tmpCounters + spaceUsed32; workspaceSize -= (spaceUsed32 << 2); } /* Compress literals */ { const BYTE *const literals = seqStorePtr->litStart; size_t const litSize = seqStorePtr->lit - literals; size_t const cSize = ZSTD_compressLiterals(zc, op, dstCapacity, literals, litSize); if (ZSTD_isError(cSize)) return cSize; op += cSize; } /* Sequences Header */ if ((oend - op) < 3 /*max nbSeq Size*/ + 1 /*seqHead */) return ERROR(dstSize_tooSmall); if (nbSeq < 0x7F) *op++ = (BYTE)nbSeq; else if (nbSeq < LONGNBSEQ) op[0] = (BYTE)((nbSeq >> 8) + 0x80), op[1] = (BYTE)nbSeq, op += 2; else op[0] = 0xFF, ZSTD_writeLE16(op + 1, (U16)(nbSeq - LONGNBSEQ)), op += 3; if (nbSeq == 0) return op - ostart; /* seqHead : flags for FSE encoding type */ seqHead = op++; #define MIN_SEQ_FOR_DYNAMIC_FSE 64 #define MAX_SEQ_FOR_STATIC_FSE 1000 /* convert length/distances into codes */ ZSTD_seqToCodes(seqStorePtr); /* CTable for Literal Lengths */ { U32 max = MaxLL; size_t const mostFrequent = FSE_countFast_wksp(count, &max, llCodeTable, nbSeq, workspace); if ((mostFrequent == nbSeq) && (nbSeq > 2)) { *op++ = llCodeTable[0]; FSE_buildCTable_rle(CTable_LitLength, (BYTE)max); LLtype = set_rle; } else if ((zc->flagStaticTables) && (nbSeq < MAX_SEQ_FOR_STATIC_FSE)) { LLtype = set_repeat; } else if ((nbSeq < MIN_SEQ_FOR_DYNAMIC_FSE) || (mostFrequent < (nbSeq >> (LL_defaultNormLog - 1)))) { FSE_buildCTable_wksp(CTable_LitLength, LL_defaultNorm, MaxLL, LL_defaultNormLog, workspace, workspaceSize); LLtype = set_basic; } else { size_t nbSeq_1 = nbSeq; const U32 tableLog = FSE_optimalTableLog(LLFSELog, nbSeq, max); if (count[llCodeTable[nbSeq - 1]] > 1) { count[llCodeTable[nbSeq - 1]]--; nbSeq_1--; } FSE_normalizeCount(norm, tableLog, count, nbSeq_1, max); { size_t const NCountSize = FSE_writeNCount(op, oend - op, norm, max, tableLog); /* overflow protected */ if (FSE_isError(NCountSize)) return NCountSize; op += NCountSize; } FSE_buildCTable_wksp(CTable_LitLength, norm, max, tableLog, workspace, workspaceSize); LLtype = set_compressed; } } /* CTable for Offsets */ { U32 max = MaxOff; size_t const mostFrequent = FSE_countFast_wksp(count, &max, ofCodeTable, nbSeq, workspace); if ((mostFrequent == nbSeq) && (nbSeq > 2)) { *op++ = ofCodeTable[0]; FSE_buildCTable_rle(CTable_OffsetBits, (BYTE)max); Offtype = set_rle; } else if ((zc->flagStaticTables) && (nbSeq < MAX_SEQ_FOR_STATIC_FSE)) { Offtype = set_repeat; } else if ((nbSeq < MIN_SEQ_FOR_DYNAMIC_FSE) || (mostFrequent < (nbSeq >> (OF_defaultNormLog - 1)))) { FSE_buildCTable_wksp(CTable_OffsetBits, OF_defaultNorm, MaxOff, OF_defaultNormLog, workspace, workspaceSize); Offtype = set_basic; } else { size_t nbSeq_1 = nbSeq; const U32 tableLog = FSE_optimalTableLog(OffFSELog, nbSeq, max); if (count[ofCodeTable[nbSeq - 1]] > 1) { count[ofCodeTable[nbSeq - 1]]--; nbSeq_1--; } FSE_normalizeCount(norm, tableLog, count, nbSeq_1, max); { size_t const NCountSize = FSE_writeNCount(op, oend - op, norm, max, tableLog); /* overflow protected */ if (FSE_isError(NCountSize)) return NCountSize; op += NCountSize; } FSE_buildCTable_wksp(CTable_OffsetBits, norm, max, tableLog, workspace, workspaceSize); Offtype = set_compressed; } } /* CTable for MatchLengths */ { U32 max = MaxML; size_t const mostFrequent = FSE_countFast_wksp(count, &max, mlCodeTable, nbSeq, workspace); if ((mostFrequent == nbSeq) && (nbSeq > 2)) { *op++ = *mlCodeTable; FSE_buildCTable_rle(CTable_MatchLength, (BYTE)max); MLtype = set_rle; } else if ((zc->flagStaticTables) && (nbSeq < MAX_SEQ_FOR_STATIC_FSE)) { MLtype = set_repeat; } else if ((nbSeq < MIN_SEQ_FOR_DYNAMIC_FSE) || (mostFrequent < (nbSeq >> (ML_defaultNormLog - 1)))) { FSE_buildCTable_wksp(CTable_MatchLength, ML_defaultNorm, MaxML, ML_defaultNormLog, workspace, workspaceSize); MLtype = set_basic; } else { size_t nbSeq_1 = nbSeq; const U32 tableLog = FSE_optimalTableLog(MLFSELog, nbSeq, max); if (count[mlCodeTable[nbSeq - 1]] > 1) { count[mlCodeTable[nbSeq - 1]]--; nbSeq_1--; } FSE_normalizeCount(norm, tableLog, count, nbSeq_1, max); { size_t const NCountSize = FSE_writeNCount(op, oend - op, norm, max, tableLog); /* overflow protected */ if (FSE_isError(NCountSize)) return NCountSize; op += NCountSize; } FSE_buildCTable_wksp(CTable_MatchLength, norm, max, tableLog, workspace, workspaceSize); MLtype = set_compressed; } } *seqHead = (BYTE)((LLtype << 6) + (Offtype << 4) + (MLtype << 2)); zc->flagStaticTables = 0; /* Encoding Sequences */ { BIT_CStream_t blockStream; FSE_CState_t stateMatchLength; FSE_CState_t stateOffsetBits; FSE_CState_t stateLitLength; CHECK_E(BIT_initCStream(&blockStream, op, oend - op), dstSize_tooSmall); /* not enough space remaining */ /* first symbols */ FSE_initCState2(&stateMatchLength, CTable_MatchLength, mlCodeTable[nbSeq - 1]); FSE_initCState2(&stateOffsetBits, CTable_OffsetBits, ofCodeTable[nbSeq - 1]); FSE_initCState2(&stateLitLength, CTable_LitLength, llCodeTable[nbSeq - 1]); BIT_addBits(&blockStream, sequences[nbSeq - 1].litLength, LL_bits[llCodeTable[nbSeq - 1]]); if (ZSTD_32bits()) BIT_flushBits(&blockStream); BIT_addBits(&blockStream, sequences[nbSeq - 1].matchLength, ML_bits[mlCodeTable[nbSeq - 1]]); if (ZSTD_32bits()) BIT_flushBits(&blockStream); if (longOffsets) { U32 const ofBits = ofCodeTable[nbSeq - 1]; int const extraBits = ofBits - MIN(ofBits, STREAM_ACCUMULATOR_MIN - 1); if (extraBits) { BIT_addBits(&blockStream, sequences[nbSeq - 1].offset, extraBits); BIT_flushBits(&blockStream); } BIT_addBits(&blockStream, sequences[nbSeq - 1].offset >> extraBits, ofBits - extraBits); } else { BIT_addBits(&blockStream, sequences[nbSeq - 1].offset, ofCodeTable[nbSeq - 1]); } BIT_flushBits(&blockStream); { size_t n; for (n = nbSeq - 2; n < nbSeq; n--) { /* intentional underflow */ BYTE const llCode = llCodeTable[n]; BYTE const ofCode = ofCodeTable[n]; BYTE const mlCode = mlCodeTable[n]; U32 const llBits = LL_bits[llCode]; U32 const ofBits = ofCode; /* 32b*/ /* 64b*/ U32 const mlBits = ML_bits[mlCode]; /* (7)*/ /* (7)*/ FSE_encodeSymbol(&blockStream, &stateOffsetBits, ofCode); /* 15 */ /* 15 */ FSE_encodeSymbol(&blockStream, &stateMatchLength, mlCode); /* 24 */ /* 24 */ if (ZSTD_32bits()) BIT_flushBits(&blockStream); /* (7)*/ FSE_encodeSymbol(&blockStream, &stateLitLength, llCode); /* 16 */ /* 33 */ if (ZSTD_32bits() || (ofBits + mlBits + llBits >= 64 - 7 - (LLFSELog + MLFSELog + OffFSELog))) BIT_flushBits(&blockStream); /* (7)*/ BIT_addBits(&blockStream, sequences[n].litLength, llBits); if (ZSTD_32bits() && ((llBits + mlBits) > 24)) BIT_flushBits(&blockStream); BIT_addBits(&blockStream, sequences[n].matchLength, mlBits); if (ZSTD_32bits()) BIT_flushBits(&blockStream); /* (7)*/ if (longOffsets) { int const extraBits = ofBits - MIN(ofBits, STREAM_ACCUMULATOR_MIN - 1); if (extraBits) { BIT_addBits(&blockStream, sequences[n].offset, extraBits); BIT_flushBits(&blockStream); /* (7)*/ } BIT_addBits(&blockStream, sequences[n].offset >> extraBits, ofBits - extraBits); /* 31 */ } else { BIT_addBits(&blockStream, sequences[n].offset, ofBits); /* 31 */ } BIT_flushBits(&blockStream); /* (7)*/ } } FSE_flushCState(&blockStream, &stateMatchLength); FSE_flushCState(&blockStream, &stateOffsetBits); FSE_flushCState(&blockStream, &stateLitLength); { size_t const streamSize = BIT_closeCStream(&blockStream); if (streamSize == 0) return ERROR(dstSize_tooSmall); /* not enough space */ op += streamSize; } } return op - ostart; }

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ZSTD_STATIC size_t ZSTD_compressSequences(ZSTD_CCtx *zc, void *dst, size_t dstCapacity, size_t srcSize) { size_t const cSize = ZSTD_compressSequences_internal(zc, dst, dstCapacity); size_t const minGain = ZSTD_minGain(srcSize); size_t const maxCSize = srcSize - minGain; /* If the srcSize <= dstCapacity, then there is enough space to write a * raw uncompressed block. Since we ran out of space, the block must not * be compressible, so fall back to a raw uncompressed block. */ int const uncompressibleError = cSize == ERROR(dstSize_tooSmall) && srcSize <= dstCapacity; int i; if (ZSTD_isError(cSize) && !uncompressibleError) return cSize; if (cSize >= maxCSize || uncompressibleError) { zc->flagStaticHufTable = HUF_repeat_none; return 0; } /* confirm repcodes */ for (i = 0; i < ZSTD_REP_NUM; i++) zc->rep[i] = zc->repToConfirm[i]; return cSize; }

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/*! ZSTD_storeSeq() : Store a sequence (literal length, literals, offset code and match length code) into seqStore_t. `offsetCode` : distance to match, or 0 == repCode. `matchCode` : matchLength - MINMATCH */
ZSTD_STATIC void ZSTD_storeSeq(seqStore_t *seqStorePtr, size_t litLength, const void *literals, U32 offsetCode, size_t matchCode) { /* copy Literals */ ZSTD_wildcopy(seqStorePtr->lit, literals, litLength); seqStorePtr->lit += litLength; /* literal Length */ if (litLength > 0xFFFF) { seqStorePtr->longLengthID = 1; seqStorePtr->longLengthPos = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart); } seqStorePtr->sequences[0].litLength = (U16)litLength; /* match offset */ seqStorePtr->sequences[0].offset = offsetCode + 1; /* match Length */ if (matchCode > 0xFFFF) { seqStorePtr->longLengthID = 2; seqStorePtr->longLengthPos = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart); } seqStorePtr->sequences[0].matchLength = (U16)matchCode; seqStorePtr->sequences++; }

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/*-************************************* * Match length counter ***************************************/
static unsigned ZSTD_NbCommonBytes(register size_t val) { if (ZSTD_isLittleEndian()) { if (ZSTD_64bits()) { return (__builtin_ctzll((U64)val) >> 3); } else { /* 32 bits */ return (__builtin_ctz((U32)val) >> 3); } } else { /* Big Endian CPU */ if (ZSTD_64bits()) { return (__builtin_clzll(val) >> 3); } else { /* 32 bits */ return (__builtin_clz((U32)val) >> 3); } } }

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static size_t ZSTD_count(const BYTE *pIn, const BYTE *pMatch, const BYTE *const pInLimit) { const BYTE *const pStart = pIn; const BYTE *const pInLoopLimit = pInLimit - (sizeof(size_t) - 1); while (pIn < pInLoopLimit) { size_t const diff = ZSTD_readST(pMatch) ^ ZSTD_readST(pIn); if (!diff) { pIn += sizeof(size_t); pMatch += sizeof(size_t); continue; } pIn += ZSTD_NbCommonBytes(diff); return (size_t)(pIn - pStart); } if (ZSTD_64bits()) if ((pIn < (pInLimit - 3)) && (ZSTD_read32(pMatch) == ZSTD_read32(pIn))) { pIn += 4; pMatch += 4; } if ((pIn < (pInLimit - 1)) && (ZSTD_read16(pMatch) == ZSTD_read16(pIn))) { pIn += 2; pMatch += 2; } if ((pIn < pInLimit) && (*pMatch == *pIn)) pIn++; return (size_t)(pIn - pStart); }

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/** ZSTD_count_2segments() : * can count match length with `ip` & `match` in 2 different segments. * convention : on reaching mEnd, match count continue starting from iStart */
static size_t ZSTD_count_2segments(const BYTE *ip, const BYTE *match, const BYTE *iEnd, const BYTE *mEnd, const BYTE *iStart) { const BYTE *const vEnd = MIN(ip + (mEnd - match), iEnd); size_t const matchLength = ZSTD_count(ip, match, vEnd); if (match + matchLength != mEnd) return matchLength; return matchLength + ZSTD_count(ip + matchLength, iStart, iEnd); }

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/*-************************************* * Hashes ***************************************/ static const U32 prime3bytes = 506832829U;
static U32 ZSTD_hash3(U32 u, U32 h) { return ((u << (32 - 24)) * prime3bytes) >> (32 - h); }

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ZSTD_STATIC size_t ZSTD_hash3Ptr(const void *ptr, U32 h) { return ZSTD_hash3(ZSTD_readLE32(ptr), h); }

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/* only in zstd_opt.h */ static const U32 prime4bytes = 2654435761U;
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(ZSTD_read32(ptr), h); }

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static const U64 prime5bytes = 889523592379ULL;
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(ZSTD_readLE64(p), h); }

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static const U64 prime6bytes = 227718039650203ULL;
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(ZSTD_readLE64(p), h); }

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static const U64 prime7bytes = 58295818150454627ULL;
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(ZSTD_readLE64(p), h); }

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static const U64 prime8bytes = 0xCF1BBCDCB7A56463ULL;
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(ZSTD_readLE64(p), h); }

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static size_t ZSTD_hashPtr(const void *p, U32 hBits, U32 mls) { switch (mls) { // case 3: return ZSTD_hash3Ptr(p, hBits); default: case 4: return ZSTD_hash4Ptr(p, hBits); case 5: return ZSTD_hash5Ptr(p, hBits); case 6: return ZSTD_hash6Ptr(p, hBits); case 7: return ZSTD_hash7Ptr(p, hBits); case 8: return ZSTD_hash8Ptr(p, hBits); } }

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/*-************************************* * Fast Scan ***************************************/
static void ZSTD_fillHashTable(ZSTD_CCtx *zc, const void *end, const U32 mls) { U32 *const hashTable = zc->hashTable; U32 const hBits = zc->params.cParams.hashLog; const BYTE *const base = zc->base; const BYTE *ip = base + zc->nextToUpdate; const BYTE *const iend = ((const BYTE *)end) - HASH_READ_SIZE; const size_t fastHashFillStep = 3; while (ip <= iend) { hashTable[ZSTD_hashPtr(ip, hBits, mls)] = (U32)(ip - base); ip += fastHashFillStep; } }

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FORCE_INLINE void ZSTD_compressBlock_fast_generic(ZSTD_CCtx *cctx, const void *src, size_t srcSize, const U32 mls) { U32 *const hashTable = cctx->hashTable; U32 const hBits = cctx->params.cParams.hashLog; seqStore_t *seqStorePtr = &(cctx->seqStore); const BYTE *const base = cctx->base; const BYTE *const istart = (const BYTE *)src; const BYTE *ip = istart; const BYTE *anchor = istart; const U32 lowestIndex = cctx->dictLimit; const BYTE *const lowest = base + lowestIndex; const BYTE *const iend = istart + srcSize; const BYTE *const ilimit = iend - HASH_READ_SIZE; U32 offset_1 = cctx->rep[0], offset_2 = cctx->rep[1]; U32 offsetSaved = 0; /* init */ ip += (ip == lowest); { U32 const maxRep = (U32)(ip - lowest); if (offset_2 > maxRep) offsetSaved = offset_2, offset_2 = 0; if (offset_1 > maxRep) offsetSaved = offset_1, offset_1 = 0; } /* Main Search Loop */ while (ip < ilimit) { /* < instead of <=, because repcode check at (ip+1) */ size_t mLength; size_t const h = ZSTD_hashPtr(ip, hBits, mls); U32 const curr = (U32)(ip - base); U32 const matchIndex = hashTable[h]; const BYTE *match = base + matchIndex; hashTable[h] = curr; /* update hash table */ if ((offset_1 > 0) & (ZSTD_read32(ip + 1 - offset_1) == ZSTD_read32(ip + 1))) { mLength = ZSTD_count(ip + 1 + 4, ip + 1 + 4 - offset_1, iend) + 4; ip++; ZSTD_storeSeq(seqStorePtr, ip - anchor, anchor, 0, mLength - MINMATCH); } else { U32 offset; if ((matchIndex <= lowestIndex) || (ZSTD_read32(match) != ZSTD_read32(ip))) { ip += ((ip - anchor) >> g_searchStrength) + 1; continue; } mLength = ZSTD_count(ip + 4, match + 4, iend) + 4; offset = (U32)(ip - match); while (((ip > anchor) & (match > lowest)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */ offset_2 = offset_1; offset_1 = offset; ZSTD_storeSeq(seqStorePtr, ip - anchor, anchor, offset + ZSTD_REP_MOVE, mLength - MINMATCH); } /* match found */ ip += mLength; anchor = ip; if (ip <= ilimit) { /* Fill Table */ hashTable[ZSTD_hashPtr(base + curr + 2, hBits, mls)] = curr + 2; /* here because curr+2 could be > iend-8 */ hashTable[ZSTD_hashPtr(ip - 2, hBits, mls)] = (U32)(ip - 2 - base); /* check immediate repcode */ while ((ip <= ilimit) && ((offset_2 > 0) & (ZSTD_read32(ip) == ZSTD_read32(ip - offset_2)))) { /* store sequence */ size_t const rLength = ZSTD_count(ip + 4, ip + 4 - offset_2, iend) + 4; { U32 const tmpOff = offset_2; offset_2 = offset_1; offset_1 = tmpOff; } /* swap offset_2 <=> offset_1 */ hashTable[ZSTD_hashPtr(ip, hBits, mls)] = (U32)(ip - base); ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, rLength - MINMATCH); ip += rLength; anchor = ip; continue; /* faster when present ... (?) */ } } } /* save reps for next block */ cctx->repToConfirm[0] = offset_1 ? offset_1 : offsetSaved; cctx->repToConfirm[1] = offset_2 ? offset_2 : offsetSaved; /* Last Literals */ { size_t const lastLLSize = iend - anchor; memcpy(seqStorePtr->lit, anchor, lastLLSize); seqStorePtr->lit += lastLLSize; } }

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static void ZSTD_compressBlock_fast(ZSTD_CCtx *ctx, const void *src, size_t srcSize) { const U32 mls = ctx->params.cParams.searchLength; switch (mls) { default: /* includes case 3 */ case 4: ZSTD_compressBlock_fast_generic(ctx, src, srcSize, 4); return; case 5: ZSTD_compressBlock_fast_generic(ctx, src, srcSize, 5); return; case 6: ZSTD_compressBlock_fast_generic(ctx, src, srcSize, 6); return; case 7: ZSTD_compressBlock_fast_generic(ctx, src, srcSize, 7); return; } }

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static void ZSTD_compressBlock_fast_extDict_generic(ZSTD_CCtx *ctx, const void *src, size_t srcSize, const U32 mls) { U32 *hashTable = ctx->hashTable; const U32 hBits = ctx->params.cParams.hashLog; seqStore_t *seqStorePtr = &(ctx->seqStore); const BYTE *const base = ctx->base; const BYTE *const dictBase = ctx->dictBase; const BYTE *const istart = (const BYTE *)src; const BYTE *ip = istart; const BYTE *anchor = istart; const U32 lowestIndex = ctx->lowLimit; const BYTE *const dictStart = dictBase + lowestIndex; const U32 dictLimit = ctx->dictLimit; const BYTE *const lowPrefixPtr = base + dictLimit; const BYTE *const dictEnd = dictBase + dictLimit; const BYTE *const iend = istart + srcSize; const BYTE *const ilimit = iend - 8; U32 offset_1 = ctx->rep[0], offset_2 = ctx->rep[1]; /* Search Loop */ while (ip < ilimit) { /* < instead of <=, because (ip+1) */ const size_t h = ZSTD_hashPtr(ip, hBits, mls); const U32 matchIndex = hashTable[h]; const BYTE *matchBase = matchIndex < dictLimit ? dictBase : base; const BYTE *match = matchBase + matchIndex; const U32 curr = (U32)(ip - base); const U32 repIndex = curr + 1 - offset_1; /* offset_1 expected <= curr +1 */ const BYTE *repBase = repIndex < dictLimit ? dictBase : base; const BYTE *repMatch = repBase + repIndex; size_t mLength; hashTable[h] = curr; /* update hash table */ if ((((U32)((dictLimit - 1) - repIndex) >= 3) /* intentional underflow */ & (repIndex > lowestIndex)) && (ZSTD_read32(repMatch) == ZSTD_read32(ip + 1))) { const BYTE *repMatchEnd = repIndex < dictLimit ? dictEnd : iend; mLength = ZSTD_count_2segments(ip + 1 + EQUAL_READ32, repMatch + EQUAL_READ32, iend, repMatchEnd, lowPrefixPtr) + EQUAL_READ32; ip++; ZSTD_storeSeq(seqStorePtr, ip - anchor, anchor, 0, mLength - MINMATCH); } else { if ((matchIndex < lowestIndex) || (ZSTD_read32(match) != ZSTD_read32(ip))) { ip += ((ip - anchor) >> g_searchStrength) + 1; continue; } { const BYTE *matchEnd = matchIndex < dictLimit ? dictEnd : iend; const BYTE *lowMatchPtr = matchIndex < dictLimit ? dictStart : lowPrefixPtr; U32 offset; mLength = ZSTD_count_2segments(ip + EQUAL_READ32, match + EQUAL_READ32, iend, matchEnd, lowPrefixPtr) + EQUAL_READ32; while (((ip > anchor) & (match > lowMatchPtr)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */ offset = curr - matchIndex; offset_2 = offset_1; offset_1 = offset; ZSTD_storeSeq(seqStorePtr, ip - anchor, anchor, offset + ZSTD_REP_MOVE, mLength - MINMATCH); } } /* found a match : store it */ ip += mLength; anchor = ip; if (ip <= ilimit) { /* Fill Table */ hashTable[ZSTD_hashPtr(base + curr + 2, hBits, mls)] = curr + 2; hashTable[ZSTD_hashPtr(ip - 2, hBits, mls)] = (U32)(ip - 2 - base); /* check immediate repcode */ while (ip <= ilimit) { U32 const curr2 = (U32)(ip - base); U32 const repIndex2 = curr2 - offset_2; const BYTE *repMatch2 = repIndex2 < dictLimit ? dictBase + repIndex2 : base + repIndex2; if ((((U32)((dictLimit - 1) - repIndex2) >= 3) & (repIndex2 > lowestIndex)) /* intentional overflow */ && (ZSTD_read32(repMatch2) == ZSTD_read32(ip))) { const BYTE *const repEnd2 = repIndex2 < dictLimit ? dictEnd : iend; size_t repLength2 = ZSTD_count_2segments(ip + EQUAL_READ32, repMatch2 + EQUAL_READ32, iend, repEnd2, lowPrefixPtr) + EQUAL_READ32; U32 tmpOffset = offset_2; offset_2 = offset_1; offset_1 = tmpOffset; /* swap offset_2 <=> offset_1 */ ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, repLength2 - MINMATCH); hashTable[ZSTD_hashPtr(ip, hBits, mls)] = curr2; ip += repLength2; anchor = ip; continue; } break; } } } /* save reps for next block */ ctx->repToConfirm[0] = offset_1; ctx->repToConfirm[1] = offset_2; /* Last Literals */ { size_t const lastLLSize = iend - anchor; memcpy(seqStorePtr->lit, anchor, lastLLSize); seqStorePtr->lit += lastLLSize; } }

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static void ZSTD_compressBlock_fast_extDict(ZSTD_CCtx *ctx, const void *src, size_t srcSize) { U32 const mls = ctx->params.cParams.searchLength; switch (mls) { default: /* includes case 3 */ case 4: ZSTD_compressBlock_fast_extDict_generic(ctx, src, srcSize, 4); return; case 5: ZSTD_compressBlock_fast_extDict_generic(ctx, src, srcSize, 5); return; case 6: ZSTD_compressBlock_fast_extDict_generic(ctx, src, srcSize, 6); return; case 7: ZSTD_compressBlock_fast_extDict_generic(ctx, src, srcSize, 7); return; } }

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/*-************************************* * Double Fast ***************************************/
static void ZSTD_fillDoubleHashTable(ZSTD_CCtx *cctx, const void *end, const U32 mls) { U32 *const hashLarge = cctx->hashTable; U32 const hBitsL = cctx->params.cParams.hashLog; U32 *const hashSmall = cctx->chainTable; U32 const hBitsS = cctx->params.cParams.chainLog; const BYTE *const base = cctx->base; const BYTE *ip = base + cctx->nextToUpdate; const BYTE *const iend = ((const BYTE *)end) - HASH_READ_SIZE; const size_t fastHashFillStep = 3; while (ip <= iend) { hashSmall[ZSTD_hashPtr(ip, hBitsS, mls)] = (U32)(ip - base); hashLarge[ZSTD_hashPtr(ip, hBitsL, 8)] = (U32)(ip - base); ip += fastHashFillStep; } }

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FORCE_INLINE void ZSTD_compressBlock_doubleFast_generic(ZSTD_CCtx *cctx, const void *src, size_t srcSize, const U32 mls) { U32 *const hashLong = cctx->hashTable; const U32 hBitsL = cctx->params.cParams.hashLog; U32 *const hashSmall = cctx->chainTable; const U32 hBitsS = cctx->params.cParams.chainLog; seqStore_t *seqStorePtr = &(cctx->seqStore); const BYTE *const base = cctx->base; const BYTE *const istart = (const BYTE *)src; const BYTE *ip = istart; const BYTE *anchor = istart; const U32 lowestIndex = cctx->dictLimit; const BYTE *const lowest = base + lowestIndex; const BYTE *const iend = istart + srcSize; const BYTE *const ilimit = iend - HASH_READ_SIZE; U32 offset_1 = cctx->rep[0], offset_2 = cctx->rep[1]; U32 offsetSaved = 0; /* init */ ip += (ip == lowest); { U32 const maxRep = (U32)(ip - lowest); if (offset_2 > maxRep) offsetSaved = offset_2, offset_2 = 0; if (offset_1 > maxRep) offsetSaved = offset_1, offset_1 = 0; } /* Main Search Loop */ while (ip < ilimit) { /* < instead of <=, because repcode check at (ip+1) */ size_t mLength; size_t const h2 = ZSTD_hashPtr(ip, hBitsL, 8); size_t const h = ZSTD_hashPtr(ip, hBitsS, mls); U32 const curr = (U32)(ip - base); U32 const matchIndexL = hashLong[h2]; U32 const matchIndexS = hashSmall[h]; const BYTE *matchLong = base + matchIndexL; const BYTE *match = base + matchIndexS; hashLong[h2] = hashSmall[h] = curr; /* update hash tables */ if ((offset_1 > 0) & (ZSTD_read32(ip + 1 - offset_1) == ZSTD_read32(ip + 1))) { /* note : by construction, offset_1 <= curr */ mLength = ZSTD_count(ip + 1 + 4, ip + 1 + 4 - offset_1, iend) + 4; ip++; ZSTD_storeSeq(seqStorePtr, ip - anchor, anchor, 0, mLength - MINMATCH); } else { U32 offset; if ((matchIndexL > lowestIndex) && (ZSTD_read64(matchLong) == ZSTD_read64(ip))) { mLength = ZSTD_count(ip + 8, matchLong + 8, iend) + 8; offset = (U32)(ip - matchLong); while (((ip > anchor) & (matchLong > lowest)) && (ip[-1] == matchLong[-1])) { ip--; matchLong--; mLength++; } /* catch up */ } else if ((matchIndexS > lowestIndex) && (ZSTD_read32(match) == ZSTD_read32(ip))) { size_t const h3 = ZSTD_hashPtr(ip + 1, hBitsL, 8); U32 const matchIndex3 = hashLong[h3]; const BYTE *match3 = base + matchIndex3; hashLong[h3] = curr + 1; if ((matchIndex3 > lowestIndex) && (ZSTD_read64(match3) == ZSTD_read64(ip + 1))) { mLength = ZSTD_count(ip + 9, match3 + 8, iend) + 8; ip++; offset = (U32)(ip - match3); while (((ip > anchor) & (match3 > lowest)) && (ip[-1] == match3[-1])) { ip--; match3--; mLength++; } /* catch up */ } else { mLength = ZSTD_count(ip + 4, match + 4, iend) + 4; offset = (U32)(ip - match); while (((ip > anchor) & (match > lowest)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */ } } else { ip += ((ip - anchor) >> g_searchStrength) + 1; continue; } offset_2 = offset_1; offset_1 = offset; ZSTD_storeSeq(seqStorePtr, ip - anchor, anchor, offset + ZSTD_REP_MOVE, mLength - MINMATCH); } /* match found */ ip += mLength; anchor = ip; if (ip <= ilimit) { /* Fill Table */ hashLong[ZSTD_hashPtr(base + curr + 2, hBitsL, 8)] = hashSmall[ZSTD_hashPtr(base + curr + 2, hBitsS, mls)] = curr + 2; /* here because curr+2 could be > iend-8 */ hashLong[ZSTD_hashPtr(ip - 2, hBitsL, 8)] = hashSmall[ZSTD_hashPtr(ip - 2, hBitsS, mls)] = (U32)(ip - 2 - base); /* check immediate repcode */ while ((ip <= ilimit) && ((offset_2 > 0) & (ZSTD_read32(ip) == ZSTD_read32(ip - offset_2)))) { /* store sequence */ size_t const rLength = ZSTD_count(ip + 4, ip + 4 - offset_2, iend) + 4; { U32 const tmpOff = offset_2; offset_2 = offset_1; offset_1 = tmpOff; } /* swap offset_2 <=> offset_1 */ hashSmall[ZSTD_hashPtr(ip, hBitsS, mls)] = (U32)(ip - base); hashLong[ZSTD_hashPtr(ip, hBitsL, 8)] = (U32)(ip - base); ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, rLength - MINMATCH); ip += rLength; anchor = ip; continue; /* faster when present ... (?) */ } } } /* save reps for next block */ cctx->repToConfirm[0] = offset_1 ? offset_1 : offsetSaved; cctx->repToConfirm[1] = offset_2 ? offset_2 : offsetSaved; /* Last Literals */ { size_t const lastLLSize = iend - anchor; memcpy(seqStorePtr->lit, anchor, lastLLSize); seqStorePtr->lit += lastLLSize; } }

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static void ZSTD_compressBlock_doubleFast(ZSTD_CCtx *ctx, const void *src, size_t srcSize) { const U32 mls = ctx->params.cParams.searchLength; switch (mls) { default: /* includes case 3 */ case 4: ZSTD_compressBlock_doubleFast_generic(ctx, src, srcSize, 4); return; case 5: ZSTD_compressBlock_doubleFast_generic(ctx, src, srcSize, 5); return; case 6: ZSTD_compressBlock_doubleFast_generic(ctx, src, srcSize, 6); return; case 7: ZSTD_compressBlock_doubleFast_generic(ctx, src, srcSize, 7); return; } }

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static void ZSTD_compressBlock_doubleFast_extDict_generic(ZSTD_CCtx *ctx, const void *src, size_t srcSize, const U32 mls) { U32 *const hashLong = ctx->hashTable; U32 const hBitsL = ctx->params.cParams.hashLog; U32 *const hashSmall = ctx->chainTable; U32 const hBitsS = ctx->params.cParams.chainLog; seqStore_t *seqStorePtr = &(ctx->seqStore); const BYTE *const base = ctx->base; const BYTE *const dictBase = ctx->dictBase; const BYTE *const istart = (const BYTE *)src; const BYTE *ip = istart; const BYTE *anchor = istart; const U32 lowestIndex = ctx->lowLimit; const BYTE *const dictStart = dictBase + lowestIndex; const U32 dictLimit = ctx->dictLimit; const BYTE *const lowPrefixPtr = base + dictLimit; const BYTE *const dictEnd = dictBase + dictLimit; const BYTE *const iend = istart + srcSize; const BYTE *const ilimit = iend - 8; U32 offset_1 = ctx->rep[0], offset_2 = ctx->rep[1]; /* Search Loop */ while (ip < ilimit) { /* < instead of <=, because (ip+1) */ const size_t hSmall = ZSTD_hashPtr(ip, hBitsS, mls); const U32 matchIndex = hashSmall[hSmall]; const BYTE *matchBase = matchIndex < dictLimit ? dictBase : base; const BYTE *match = matchBase + matchIndex; const size_t hLong = ZSTD_hashPtr(ip, hBitsL, 8); const U32 matchLongIndex = hashLong[hLong]; const BYTE *matchLongBase = matchLongIndex < dictLimit ? dictBase : base; const BYTE *matchLong = matchLongBase + matchLongIndex; const U32 curr = (U32)(ip - base); const U32 repIndex = curr + 1 - offset_1; /* offset_1 expected <= curr +1 */ const BYTE *repBase = repIndex < dictLimit ? dictBase : base; const BYTE *repMatch = repBase + repIndex; size_t mLength; hashSmall[hSmall] = hashLong[hLong] = curr; /* update hash table */ if ((((U32)((dictLimit - 1) - repIndex) >= 3) /* intentional underflow */ & (repIndex > lowestIndex)) && (ZSTD_read32(repMatch) == ZSTD_read32(ip + 1))) { const BYTE *repMatchEnd = repIndex < dictLimit ? dictEnd : iend; mLength = ZSTD_count_2segments(ip + 1 + 4, repMatch + 4, iend, repMatchEnd, lowPrefixPtr) + 4; ip++; ZSTD_storeSeq(seqStorePtr, ip - anchor, anchor, 0, mLength - MINMATCH); } else { if ((matchLongIndex > lowestIndex) && (ZSTD_read64(matchLong) == ZSTD_read64(ip))) { const BYTE *matchEnd = matchLongIndex < dictLimit ? dictEnd : iend; const BYTE *lowMatchPtr = matchLongIndex < dictLimit ? dictStart : lowPrefixPtr; U32 offset; mLength = ZSTD_count_2segments(ip + 8, matchLong + 8, iend, matchEnd, lowPrefixPtr) + 8; offset = curr - matchLongIndex; while (((ip > anchor) & (matchLong > lowMatchPtr)) && (ip[-1] == matchLong[-1])) { ip--; matchLong--; mLength++; } /* catch up */ offset_2 = offset_1; offset_1 = offset; ZSTD_storeSeq(seqStorePtr, ip - anchor, anchor, offset + ZSTD_REP_MOVE, mLength - MINMATCH); } else if ((matchIndex > lowestIndex) && (ZSTD_read32(match) == ZSTD_read32(ip))) { size_t const h3 = ZSTD_hashPtr(ip + 1, hBitsL, 8); U32 const matchIndex3 = hashLong[h3]; const BYTE *const match3Base = matchIndex3 < dictLimit ? dictBase : base; const BYTE *match3 = match3Base + matchIndex3; U32 offset; hashLong[h3] = curr + 1; if ((matchIndex3 > lowestIndex) && (ZSTD_read64(match3) == ZSTD_read64(ip + 1))) { const BYTE *matchEnd = matchIndex3 < dictLimit ? dictEnd : iend; const BYTE *lowMatchPtr = matchIndex3 < dictLimit ? dictStart : lowPrefixPtr; mLength = ZSTD_count_2segments(ip + 9, match3 + 8, iend, matchEnd, lowPrefixPtr) + 8; ip++; offset = curr + 1 - matchIndex3; while (((ip > anchor) & (match3 > lowMatchPtr)) && (ip[-1] == match3[-1])) { ip--; match3--; mLength++; } /* catch up */ } else { const BYTE *matchEnd = matchIndex < dictLimit ? dictEnd : iend; const BYTE *lowMatchPtr = matchIndex < dictLimit ? dictStart : lowPrefixPtr; mLength = ZSTD_count_2segments(ip + 4, match + 4, iend, matchEnd, lowPrefixPtr) + 4; offset = curr - matchIndex; while (((ip > anchor) & (match > lowMatchPtr)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */ } offset_2 = offset_1; offset_1 = offset; ZSTD_storeSeq(seqStorePtr, ip - anchor, anchor, offset + ZSTD_REP_MOVE, mLength - MINMATCH); } else { ip += ((ip - anchor) >> g_searchStrength) + 1; continue; } } /* found a match : store it */ ip += mLength; anchor = ip; if (ip <= ilimit) { /* Fill Table */ hashSmall[ZSTD_hashPtr(base + curr + 2, hBitsS, mls)] = curr + 2; hashLong[ZSTD_hashPtr(base + curr + 2, hBitsL, 8)] = curr + 2; hashSmall[ZSTD_hashPtr(ip - 2, hBitsS, mls)] = (U32)(ip - 2 - base); hashLong[ZSTD_hashPtr(ip - 2, hBitsL, 8)] = (U32)(ip - 2 - base); /* check immediate repcode */ while (ip <= ilimit) { U32 const curr2 = (U32)(ip - base); U32 const repIndex2 = curr2 - offset_2; const BYTE *repMatch2 = repIndex2 < dictLimit ? dictBase + repIndex2 : base + repIndex2; if ((((U32)((dictLimit - 1) - repIndex2) >= 3) & (repIndex2 > lowestIndex)) /* intentional overflow */ && (ZSTD_read32(repMatch2) == ZSTD_read32(ip))) { const BYTE *const repEnd2 = repIndex2 < dictLimit ? dictEnd : iend; size_t const repLength2 = ZSTD_count_2segments(ip + EQUAL_READ32, repMatch2 + EQUAL_READ32, iend, repEnd2, lowPrefixPtr) + EQUAL_READ32; U32 tmpOffset = offset_2; offset_2 = offset_1; offset_1 = tmpOffset; /* swap offset_2 <=> offset_1 */ ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, repLength2 - MINMATCH); hashSmall[ZSTD_hashPtr(ip, hBitsS, mls)] = curr2; hashLong[ZSTD_hashPtr(ip, hBitsL, 8)] = curr2; ip += repLength2; anchor = ip; continue; } break; } } } /* save reps for next block */ ctx->repToConfirm[0] = offset_1; ctx->repToConfirm[1] = offset_2; /* Last Literals */ { size_t const lastLLSize = iend - anchor; memcpy(seqStorePtr->lit, anchor, lastLLSize); seqStorePtr->lit += lastLLSize; } }

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static void ZSTD_compressBlock_doubleFast_extDict(ZSTD_CCtx *ctx, const void *src, size_t srcSize) { U32 const mls = ctx->params.cParams.searchLength; switch (mls) { default: /* includes case 3 */ case 4: ZSTD_compressBlock_doubleFast_extDict_generic(ctx, src, srcSize, 4); return; case 5: ZSTD_compressBlock_doubleFast_extDict_generic(ctx, src, srcSize, 5); return; case 6: ZSTD_compressBlock_doubleFast_extDict_generic(ctx, src, srcSize, 6); return; case 7: ZSTD_compressBlock_doubleFast_extDict_generic(ctx, src, srcSize, 7); return; } }

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/*-************************************* * Binary Tree search ***************************************/ /** ZSTD_insertBt1() : add one or multiple positions to tree. * ip : assumed <= iend-8 . * @return : nb of positions added */
static U32 ZSTD_insertBt1(ZSTD_CCtx *zc, const BYTE *const ip, const U32 mls, const BYTE *const iend, U32 nbCompares, U32 extDict) { U32 *const hashTable = zc->hashTable; U32 const hashLog = zc->params.cParams.hashLog; size_t const h = ZSTD_hashPtr(ip, hashLog, mls); U32 *const bt = zc->chainTable; U32 const btLog = zc->params.cParams.chainLog - 1; U32 const btMask = (1 << btLog) - 1; U32 matchIndex = hashTable[h]; size_t commonLengthSmaller = 0, commonLengthLarger = 0; const BYTE *const base = zc->base; const BYTE *const dictBase = zc->dictBase; const U32 dictLimit = zc->dictLimit; const BYTE *const dictEnd = dictBase + dictLimit; const BYTE *const prefixStart = base + dictLimit; const BYTE *match; const U32 curr = (U32)(ip - base); const U32 btLow = btMask >= curr ? 0 : curr - btMask; U32 *smallerPtr = bt + 2 * (curr & btMask); U32 *largerPtr = smallerPtr + 1; U32 dummy32; /* to be nullified at the end */ U32 const windowLow = zc->lowLimit; U32 matchEndIdx = curr + 8; size_t bestLength = 8; hashTable[h] = curr; /* Update Hash Table */ while (nbCompares-- && (matchIndex > windowLow)) { U32 *const nextPtr = bt + 2 * (matchIndex & btMask); size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger); /* guaranteed minimum nb of common bytes */ if ((!extDict) || (matchIndex + matchLength >= dictLimit)) { match = base + matchIndex; if (match[matchLength] == ip[matchLength]) matchLength += ZSTD_count(ip + matchLength + 1, match + matchLength + 1, iend) + 1; } else { match = dictBase + matchIndex; matchLength += ZSTD_count_2segments(ip + matchLength, match + matchLength, iend, dictEnd, prefixStart); if (matchIndex + matchLength >= dictLimit) match = base + matchIndex; /* to prepare for next usage of match[matchLength] */ } if (matchLength > bestLength) { bestLength = matchLength; if (matchLength > matchEndIdx - matchIndex) matchEndIdx = matchIndex + (U32)matchLength; } if (ip + matchLength == iend) /* equal : no way to know if inf or sup */ break; /* drop , to guarantee consistency ; miss a bit of compression, but other solutions can corrupt the tree */ if (match[matchLength] < ip[matchLength]) { /* necessarily within correct buffer */ /* match is smaller than curr */ *smallerPtr = matchIndex; /* update smaller idx */ commonLengthSmaller = matchLength; /* all smaller will now have at least this guaranteed common length */ if (matchIndex <= btLow) { smallerPtr = &dummy32; break; } /* beyond tree size, stop the search */ smallerPtr = nextPtr + 1; /* new "smaller" => larger of match */ matchIndex = nextPtr[1]; /* new matchIndex larger than previous (closer to curr) */ } else { /* match is larger than curr */ *largerPtr = matchIndex; commonLengthLarger = matchLength; if (matchIndex <= btLow) { largerPtr = &dummy32; break; } /* beyond tree size, stop the search */ largerPtr = nextPtr; matchIndex = nextPtr[0]; } } *smallerPtr = *largerPtr = 0; if (bestLength > 384) return MIN(192, (U32)(bestLength - 384)); /* speed optimization */ if (matchEndIdx > curr + 8) return matchEndIdx - curr - 8; return 1; }

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static size_t ZSTD_insertBtAndFindBestMatch(ZSTD_CCtx *zc, const BYTE *const ip, const BYTE *const iend, size_t *offsetPtr, U32 nbCompares, const U32 mls, U32 extDict) { U32 *const hashTable = zc->hashTable; U32 const hashLog = zc->params.cParams.hashLog; size_t const h = ZSTD_hashPtr(ip, hashLog, mls); U32 *const bt = zc->chainTable; U32 const btLog = zc->params.cParams.chainLog - 1; U32 const btMask = (1 << btLog) - 1; U32 matchIndex = hashTable[h]; size_t commonLengthSmaller = 0, commonLengthLarger = 0; const BYTE *const base = zc->base; const BYTE *const dictBase = zc->dictBase; const U32 dictLimit = zc->dictLimit; const BYTE *const dictEnd = dictBase + dictLimit; const BYTE *const prefixStart = base + dictLimit; const U32 curr = (U32)(ip - base); const U32 btLow = btMask >= curr ? 0 : curr - btMask; const U32 windowLow = zc->lowLimit; U32 *smallerPtr = bt + 2 * (curr & btMask); U32 *largerPtr = bt + 2 * (curr & btMask) + 1; U32 matchEndIdx = curr + 8; U32 dummy32; /* to be nullified at the end */ size_t bestLength = 0; hashTable[h] = curr; /* Update Hash Table */ while (nbCompares-- && (matchIndex > windowLow)) { U32 *const nextPtr = bt + 2 * (matchIndex & btMask); size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger); /* guaranteed minimum nb of common bytes */ const BYTE *match; if ((!extDict) || (matchIndex + matchLength >= dictLimit)) { match = base + matchIndex; if (match[matchLength] == ip[matchLength]) matchLength += ZSTD_count(ip + matchLength + 1, match + matchLength + 1, iend) + 1; } else { match = dictBase + matchIndex; matchLength += ZSTD_count_2segments(ip + matchLength, match + matchLength, iend, dictEnd, prefixStart); if (matchIndex + matchLength >= dictLimit) match = base + matchIndex; /* to prepare for next usage of match[matchLength] */ } if (matchLength > bestLength) { if (matchLength > matchEndIdx - matchIndex) matchEndIdx = matchIndex + (U32)matchLength; if ((4 * (int)(matchLength - bestLength)) > (int)(ZSTD_highbit32(curr - matchIndex + 1) - ZSTD_highbit32((U32)offsetPtr[0] + 1))) bestLength = matchLength, *offsetPtr = ZSTD_REP_MOVE + curr - matchIndex; if (ip + matchLength == iend) /* equal : no way to know if inf or sup */ break; /* drop, to guarantee consistency (miss a little bit of compression) */ } if (match[matchLength] < ip[matchLength]) { /* match is smaller than curr */ *smallerPtr = matchIndex; /* update smaller idx */ commonLengthSmaller = matchLength; /* all smaller will now have at least this guaranteed common length */ if (matchIndex <= btLow) { smallerPtr = &dummy32; break; } /* beyond tree size, stop the search */ smallerPtr = nextPtr + 1; /* new "smaller" => larger of match */ matchIndex = nextPtr[1]; /* new matchIndex larger than previous (closer to curr) */ } else { /* match is larger than curr */ *largerPtr = matchIndex; commonLengthLarger = matchLength; if (matchIndex <= btLow) { largerPtr = &dummy32; break; } /* beyond tree size, stop the search */ largerPtr = nextPtr; matchIndex = nextPtr[0]; } } *smallerPtr = *largerPtr = 0; zc->nextToUpdate = (matchEndIdx > curr + 8) ? matchEndIdx - 8 : curr + 1; return bestLength; }

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static void ZSTD_updateTree(ZSTD_CCtx *zc, const BYTE *const ip, const BYTE *const iend, const U32 nbCompares, const U32 mls) { const BYTE *const base = zc->base; const U32 target = (U32)(ip - base); U32 idx = zc->nextToUpdate; while (idx < target) idx += ZSTD_insertBt1(zc, base + idx, mls, iend, nbCompares, 0); }

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/** ZSTD_BtFindBestMatch() : Tree updater, providing best match */
static size_t ZSTD_BtFindBestMatch(ZSTD_CCtx *zc, const BYTE *const ip, const BYTE *const iLimit, size_t *offsetPtr, const U32 maxNbAttempts, const U32 mls) { if (ip < zc->base + zc->nextToUpdate) return 0; /* skipped area */ ZSTD_updateTree(zc, ip, iLimit, maxNbAttempts, mls); return ZSTD_insertBtAndFindBestMatch(zc, ip, iLimit, offsetPtr, maxNbAttempts, mls, 0); }

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static size_t ZSTD_BtFindBestMatch_selectMLS(ZSTD_CCtx *zc, /* Index table will be updated */ const BYTE *ip, const BYTE *const iLimit, size_t *offsetPtr, const U32 maxNbAttempts, const U32 matchLengthSearch) { switch (matchLengthSearch) { default: /* includes case 3 */ case 4: return ZSTD_BtFindBestMatch(zc, ip, iLimit, offsetPtr, maxNbAttempts, 4); case 5: return ZSTD_BtFindBestMatch(zc, ip, iLimit, offsetPtr, maxNbAttempts, 5); case 7: case 6: return ZSTD_BtFindBestMatch(zc, ip, iLimit, offsetPtr, maxNbAttempts, 6); } }

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static void ZSTD_updateTree_extDict(ZSTD_CCtx *zc, const BYTE *const ip, const BYTE *const iend, const U32 nbCompares, const U32 mls) { const BYTE *const base = zc->base; const U32 target = (U32)(ip - base); U32 idx = zc->nextToUpdate; while (idx < target) idx += ZSTD_insertBt1(zc, base + idx, mls, iend, nbCompares, 1); }

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/** Tree updater, providing best match */
static size_t ZSTD_BtFindBestMatch_extDict(ZSTD_CCtx *zc, const BYTE *const ip, const BYTE *const iLimit, size_t *offsetPtr, const U32 maxNbAttempts, const U32 mls) { if (ip < zc->base + zc->nextToUpdate) return 0; /* skipped area */ ZSTD_updateTree_extDict(zc, ip, iLimit, maxNbAttempts, mls); return ZSTD_insertBtAndFindBestMatch(zc, ip, iLimit, offsetPtr, maxNbAttempts, mls, 1); }

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static size_t ZSTD_BtFindBestMatch_selectMLS_extDict(ZSTD_CCtx *zc, /* Index table will be updated */ const BYTE *ip, const BYTE *const iLimit, size_t *offsetPtr, const U32 maxNbAttempts, const U32 matchLengthSearch) { switch (matchLengthSearch) { default: /* includes case 3 */ case 4: return ZSTD_BtFindBestMatch_extDict(zc, ip, iLimit, offsetPtr, maxNbAttempts, 4); case 5: return ZSTD_BtFindBestMatch_extDict(zc, ip, iLimit, offsetPtr, maxNbAttempts, 5); case 7: case 6: return ZSTD_BtFindBestMatch_extDict(zc, ip, iLimit, offsetPtr, maxNbAttempts, 6); } }

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/* ********************************* * Hash Chain ***********************************/ #define NEXT_IN_CHAIN(d, mask) chainTable[(d)&mask] /* Update chains up to ip (excluded) Assumption : always within prefix (i.e. not within extDict) */
FORCE_INLINE U32 ZSTD_insertAndFindFirstIndex(ZSTD_CCtx *zc, const BYTE *ip, U32 mls) { U32 *const hashTable = zc->hashTable; const U32 hashLog = zc->params.cParams.hashLog; U32 *const chainTable = zc->chainTable; const U32 chainMask = (1 << zc->params.cParams.chainLog) - 1; const BYTE *const base = zc->base; const U32 target = (U32)(ip - base); U32 idx = zc->nextToUpdate; while (idx < target) { /* catch up */ size_t const h = ZSTD_hashPtr(base + idx, hashLog, mls); NEXT_IN_CHAIN(idx, chainMask) = hashTable[h]; hashTable[h] = idx; idx++; } zc->nextToUpdate = target; return hashTable[ZSTD_hashPtr(ip, hashLog, mls)]; }

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/* inlining is important to hardwire a hot branch (template emulation) */
FORCE_INLINE size_t ZSTD_HcFindBestMatch_generic(ZSTD_CCtx *zc, /* Index table will be updated */ const BYTE *const ip, const BYTE *const iLimit, size_t *offsetPtr, const U32 maxNbAttempts, const U32 mls, const U32 extDict) { U32 *const chainTable = zc->chainTable; const U32 chainSize = (1 << zc->params.cParams.chainLog); const U32 chainMask = chainSize - 1; const BYTE *const base = zc->base; const BYTE *const dictBase = zc->dictBase; const U32 dictLimit = zc->dictLimit; const BYTE *const prefixStart = base + dictLimit; const BYTE *const dictEnd = dictBase + dictLimit; const U32 lowLimit = zc->lowLimit; const U32 curr = (U32)(ip - base); const U32 minChain = curr > chainSize ? curr - chainSize : 0; int nbAttempts = maxNbAttempts; size_t ml = EQUAL_READ32 - 1; /* HC4 match finder */ U32 matchIndex = ZSTD_insertAndFindFirstIndex(zc, ip, mls); for (; (matchIndex > lowLimit) & (nbAttempts > 0); nbAttempts--) { const BYTE *match; size_t currMl = 0; if ((!extDict) || matchIndex >= dictLimit) { match = base + matchIndex; if (match[ml] == ip[ml]) /* potentially better */ currMl = ZSTD_count(ip, match, iLimit); } else { match = dictBase + matchIndex; if (ZSTD_read32(match) == ZSTD_read32(ip)) /* assumption : matchIndex <= dictLimit-4 (by table construction) */ currMl = ZSTD_count_2segments(ip + EQUAL_READ32, match + EQUAL_READ32, iLimit, dictEnd, prefixStart) + EQUAL_READ32; } /* save best solution */ if (currMl > ml) { ml = currMl; *offsetPtr = curr - matchIndex + ZSTD_REP_MOVE; if (ip + currMl == iLimit) break; /* best possible, and avoid read overflow*/ } if (matchIndex <= minChain) break; matchIndex = NEXT_IN_CHAIN(matchIndex, chainMask); } return ml; }

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FORCE_INLINE size_t ZSTD_HcFindBestMatch_selectMLS(ZSTD_CCtx *zc, const BYTE *ip, const BYTE *const iLimit, size_t *offsetPtr, const U32 maxNbAttempts, const U32 matchLengthSearch) { switch (matchLengthSearch) { default: /* includes case 3 */ case 4: return ZSTD_HcFindBestMatch_generic(zc, ip, iLimit, offsetPtr, maxNbAttempts, 4, 0); case 5: return ZSTD_HcFindBestMatch_generic(zc, ip, iLimit, offsetPtr, maxNbAttempts, 5, 0); case 7: case 6: return ZSTD_HcFindBestMatch_generic(zc, ip, iLimit, offsetPtr, maxNbAttempts, 6, 0); } }

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FORCE_INLINE size_t ZSTD_HcFindBestMatch_extDict_selectMLS(ZSTD_CCtx *zc, const BYTE *ip, const BYTE *const iLimit, size_t *offsetPtr, const U32 maxNbAttempts, const U32 matchLengthSearch) { switch (matchLengthSearch) { default: /* includes case 3 */ case 4: return ZSTD_HcFindBestMatch_generic(zc, ip, iLimit, offsetPtr, maxNbAttempts, 4, 1); case 5: return ZSTD_HcFindBestMatch_generic(zc, ip, iLimit, offsetPtr, maxNbAttempts, 5, 1); case 7: case 6: return ZSTD_HcFindBestMatch_generic(zc, ip, iLimit, offsetPtr, maxNbAttempts, 6, 1); } }

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/* ******************************* * Common parser - lazy strategy *********************************/
FORCE_INLINE void ZSTD_compressBlock_lazy_generic(ZSTD_CCtx *ctx, const void *src, size_t srcSize, const U32 searchMethod, const U32 depth) { seqStore_t *seqStorePtr = &(ctx->seqStore); const BYTE *const istart = (const BYTE *)src; const BYTE *ip = istart; const BYTE *anchor = istart; const BYTE *const iend = istart + srcSize; const BYTE *const ilimit = iend - 8; const BYTE *const base = ctx->base + ctx->dictLimit; U32 const maxSearches = 1 << ctx->params.cParams.searchLog; U32 const mls = ctx->params.cParams.searchLength; typedef size_t (*searchMax_f)(ZSTD_CCtx * zc, const BYTE *ip, const BYTE *iLimit, size_t *offsetPtr, U32 maxNbAttempts, U32 matchLengthSearch); searchMax_f const searchMax = searchMethod ? ZSTD_BtFindBestMatch_selectMLS : ZSTD_HcFindBestMatch_selectMLS; U32 offset_1 = ctx->rep[0], offset_2 = ctx->rep[1], savedOffset = 0; /* init */ ip += (ip == base); ctx->nextToUpdate3 = ctx->nextToUpdate; { U32 const maxRep = (U32)(ip - base); if (offset_2 > maxRep) savedOffset = offset_2, offset_2 = 0; if (offset_1 > maxRep) savedOffset = offset_1, offset_1 = 0; } /* Match Loop */ while (ip < ilimit) { size_t matchLength = 0; size_t offset = 0; const BYTE *start = ip + 1; /* check repCode */ if ((offset_1 > 0) & (ZSTD_read32(ip + 1) == ZSTD_read32(ip + 1 - offset_1))) { /* repcode : we take it */ matchLength = ZSTD_count(ip + 1 + EQUAL_READ32, ip + 1 + EQUAL_READ32 - offset_1, iend) + EQUAL_READ32; if (depth == 0) goto _storeSequence; } /* first search (depth 0) */ { size_t offsetFound = 99999999; size_t const ml2 = searchMax(ctx, ip, iend, &offsetFound, maxSearches, mls); if (ml2 > matchLength) matchLength = ml2, start = ip, offset = offsetFound; } if (matchLength < EQUAL_READ32) { ip += ((ip - anchor) >> g_searchStrength) + 1; /* jump faster over incompressible sections */ continue; } /* let's try to find a better solution */ if (depth >= 1) while (ip < ilimit) { ip++; if ((offset) && ((offset_1 > 0) & (ZSTD_read32(ip) == ZSTD_read32(ip - offset_1)))) { size_t const mlRep = ZSTD_count(ip + EQUAL_READ32, ip + EQUAL_READ32 - offset_1, iend) + EQUAL_READ32; int const gain2 = (int)(mlRep * 3); int const gain1 = (int)(matchLength * 3 - ZSTD_highbit32((U32)offset + 1) + 1); if ((mlRep >= EQUAL_READ32) && (gain2 > gain1)) matchLength = mlRep, offset = 0, start = ip; } { size_t offset2 = 99999999; size_t const ml2 = searchMax(ctx, ip, iend, &offset2, maxSearches, mls); int const gain2 = (int)(ml2 * 4 - ZSTD_highbit32((U32)offset2 + 1)); /* raw approx */ int const gain1 = (int)(matchLength * 4 - ZSTD_highbit32((U32)offset + 1) + 4); if ((ml2 >= EQUAL_READ32) && (gain2 > gain1)) { matchLength = ml2, offset = offset2, start = ip; continue; /* search a better one */ } } /* let's find an even better one */ if ((depth == 2) && (ip < ilimit)) { ip++; if ((offset) && ((offset_1 > 0) & (ZSTD_read32(ip) == ZSTD_read32(ip - offset_1)))) { size_t const ml2 = ZSTD_count(ip + EQUAL_READ32, ip + EQUAL_READ32 - offset_1, iend) + EQUAL_READ32; int const gain2 = (int)(ml2 * 4); int const gain1 = (int)(matchLength * 4 - ZSTD_highbit32((U32)offset + 1) + 1); if ((ml2 >= EQUAL_READ32) && (gain2 > gain1)) matchLength = ml2, offset = 0, start = ip; } { size_t offset2 = 99999999; size_t const ml2 = searchMax(ctx, ip, iend, &offset2, maxSearches, mls); int const gain2 = (int)(ml2 * 4 - ZSTD_highbit32((U32)offset2 + 1)); /* raw approx */ int const gain1 = (int)(matchLength * 4 - ZSTD_highbit32((U32)offset + 1) + 7); if ((ml2 >= EQUAL_READ32) && (gain2 > gain1)) { matchLength = ml2, offset = offset2, start = ip; continue; } } } break; /* nothing found : store previous solution */ } /* NOTE: * start[-offset+ZSTD_REP_MOVE-1] is undefined behavior. * (-offset+ZSTD_REP_MOVE-1) is unsigned, and is added to start, which * overflows the pointer, which is undefined behavior. */ /* catch up */ if (offset) { while ((start > anchor) && (start > base + offset - ZSTD_REP_MOVE) && (start[-1] == (start-offset+ZSTD_REP_MOVE)[-1])) /* only search for offset within prefix */ { start--; matchLength++; } offset_2 = offset_1; offset_1 = (U32)(offset - ZSTD_REP_MOVE); } /* store sequence */ _storeSequence: { size_t const litLength = start - anchor; ZSTD_storeSeq(seqStorePtr, litLength, anchor, (U32)offset, matchLength - MINMATCH); anchor = ip = start + matchLength; } /* check immediate repcode */ while ((ip <= ilimit) && ((offset_2 > 0) & (ZSTD_read32(ip) == ZSTD_read32(ip - offset_2)))) { /* store sequence */ matchLength = ZSTD_count(ip + EQUAL_READ32, ip + EQUAL_READ32 - offset_2, iend) + EQUAL_READ32; offset = offset_2; offset_2 = offset_1; offset_1 = (U32)offset; /* swap repcodes */ ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, matchLength - MINMATCH); ip += matchLength; anchor = ip; continue; /* faster when present ... (?) */ } } /* Save reps for next block */ ctx->repToConfirm[0] = offset_1 ? offset_1 : savedOffset; ctx->repToConfirm[1] = offset_2 ? offset_2 : savedOffset; /* Last Literals */ { size_t const lastLLSize = iend - anchor; memcpy(seqStorePtr->lit, anchor, lastLLSize); seqStorePtr->lit += lastLLSize; } }

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static void ZSTD_compressBlock_btlazy2(ZSTD_CCtx *ctx, const void *src, size_t srcSize) { ZSTD_compressBlock_lazy_generic(ctx, src, srcSize, 1, 2); }

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static void ZSTD_compressBlock_lazy2(ZSTD_CCtx *ctx, const void *src, size_t srcSize) { ZSTD_compressBlock_lazy_generic(ctx, src, srcSize, 0, 2); }

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static void ZSTD_compressBlock_lazy(ZSTD_CCtx *ctx, const void *src, size_t srcSize) { ZSTD_compressBlock_lazy_generic(ctx, src, srcSize, 0, 1); }

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static void ZSTD_compressBlock_greedy(ZSTD_CCtx *ctx, const void *src, size_t srcSize) { ZSTD_compressBlock_lazy_generic(ctx, src, srcSize, 0, 0); }

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FORCE_INLINE void ZSTD_compressBlock_lazy_extDict_generic(ZSTD_CCtx *ctx, const void *src, size_t srcSize, const U32 searchMethod, const U32 depth) { seqStore_t *seqStorePtr = &(ctx->seqStore); const BYTE *const istart = (const BYTE *)src; const BYTE *ip = istart; const BYTE *anchor = istart; const BYTE *const iend = istart + srcSize; const BYTE *const ilimit = iend - 8; const BYTE *const base = ctx->base; const U32 dictLimit = ctx->dictLimit; const U32 lowestIndex = ctx->lowLimit; const BYTE *const prefixStart = base + dictLimit; const BYTE *const dictBase = ctx->dictBase; const BYTE *const dictEnd = dictBase + dictLimit; const BYTE *const dictStart = dictBase + ctx->lowLimit; const U32 maxSearches = 1 << ctx->params.cParams.searchLog; const U32 mls = ctx->params.cParams.searchLength; typedef size_t (*searchMax_f)(ZSTD_CCtx * zc, const BYTE *ip, const BYTE *iLimit, size_t *offsetPtr, U32 maxNbAttempts, U32 matchLengthSearch); searchMax_f searchMax = searchMethod ? ZSTD_BtFindBestMatch_selectMLS_extDict : ZSTD_HcFindBestMatch_extDict_selectMLS; U32 offset_1 = ctx->rep[0], offset_2 = ctx->rep[1]; /* init */ ctx->nextToUpdate3 = ctx->nextToUpdate; ip += (ip == prefixStart); /* Match Loop */ while (ip < ilimit) { size_t matchLength = 0; size_t offset = 0; const BYTE *start = ip + 1; U32 curr = (U32)(ip - base); /* check repCode */ { const U32 repIndex = (U32)(curr + 1 - offset_1); const BYTE *const repBase = repIndex < dictLimit ? dictBase : base; const BYTE *const repMatch = repBase + repIndex; if (((U32)((dictLimit - 1) - repIndex) >= 3) & (repIndex > lowestIndex)) /* intentional overflow */ if (ZSTD_read32(ip + 1) == ZSTD_read32(repMatch)) { /* repcode detected we should take it */ const BYTE *const repEnd = repIndex < dictLimit ? dictEnd : iend; matchLength = ZSTD_count_2segments(ip + 1 + EQUAL_READ32, repMatch + EQUAL_READ32, iend, repEnd, prefixStart) + EQUAL_READ32; if (depth == 0) goto _storeSequence; } } /* first search (depth 0) */ { size_t offsetFound = 99999999; size_t const ml2 = searchMax(ctx, ip, iend, &offsetFound, maxSearches, mls); if (ml2 > matchLength) matchLength = ml2, start = ip, offset = offsetFound; } if (matchLength < EQUAL_READ32) { ip += ((ip - anchor) >> g_searchStrength) + 1; /* jump faster over incompressible sections */ continue; } /* let's try to find a better solution */ if (depth >= 1) while (ip < ilimit) { ip++; curr++; /* check repCode */ if (offset) { const U32 repIndex = (U32)(curr - offset_1); const BYTE *const repBase = repIndex < dictLimit ? dictBase : base; const BYTE *const repMatch = repBase + repIndex; if (((U32)((dictLimit - 1) - repIndex) >= 3) & (repIndex > lowestIndex)) /* intentional overflow */ if (ZSTD_read32(ip) == ZSTD_read32(repMatch)) { /* repcode detected */ const BYTE *const repEnd = repIndex < dictLimit ? dictEnd : iend; size_t const repLength = ZSTD_count_2segments(ip + EQUAL_READ32, repMatch + EQUAL_READ32, iend, repEnd, prefixStart) + EQUAL_READ32; int const gain2 = (int)(repLength * 3); int const gain1 = (int)(matchLength * 3 - ZSTD_highbit32((U32)offset + 1) + 1); if ((repLength >= EQUAL_READ32) && (gain2 > gain1)) matchLength = repLength, offset = 0, start = ip; } } /* search match, depth 1 */ { size_t offset2 = 99999999; size_t const ml2 = searchMax(ctx, ip, iend, &offset2, maxSearches, mls); int const gain2 = (int)(ml2 * 4 - ZSTD_highbit32((U32)offset2 + 1)); /* raw approx */ int const gain1 = (int)(matchLength * 4 - ZSTD_highbit32((U32)offset + 1) + 4); if ((ml2 >= EQUAL_READ32) && (gain2 > gain1)) { matchLength = ml2, offset = offset2, start = ip; continue; /* search a better one */ } } /* let's find an even better one */ if ((depth == 2) && (ip < ilimit)) { ip++; curr++; /* check repCode */ if (offset) { const U32 repIndex = (U32)(curr - offset_1); const BYTE *const repBase = repIndex < dictLimit ? dictBase : base; const BYTE *const repMatch = repBase + repIndex; if (((U32)((dictLimit - 1) - repIndex) >= 3) & (repIndex > lowestIndex)) /* intentional overflow */ if (ZSTD_read32(ip) == ZSTD_read32(repMatch)) { /* repcode detected */ const BYTE *const repEnd = repIndex < dictLimit ? dictEnd : iend; size_t repLength = ZSTD_count_2segments(ip + EQUAL_READ32, repMatch + EQUAL_READ32, iend, repEnd, prefixStart) + EQUAL_READ32; int gain2 = (int)(repLength * 4); int gain1 = (int)(matchLength * 4 - ZSTD_highbit32((U32)offset + 1) + 1); if ((repLength >= EQUAL_READ32) && (gain2 > gain1)) matchLength = repLength, offset = 0, start = ip; } } /* search match, depth 2 */ { size_t offset2 = 99999999; size_t const ml2 = searchMax(ctx, ip, iend, &offset2, maxSearches, mls); int const gain2 = (int)(ml2 * 4 - ZSTD_highbit32((U32)offset2 + 1)); /* raw approx */ int const gain1 = (int)(matchLength * 4 - ZSTD_highbit32((U32)offset + 1) + 7); if ((ml2 >= EQUAL_READ32) && (gain2 > gain1)) { matchLength = ml2, offset = offset2, start = ip; continue; } } } break; /* nothing found : store previous solution */ } /* catch up */ if (offset) { U32 const matchIndex = (U32)((start - base) - (offset - ZSTD_REP_MOVE)); const BYTE *match = (matchIndex < dictLimit) ? dictBase + matchIndex : base + matchIndex; const BYTE *const mStart = (matchIndex < dictLimit) ? dictStart : prefixStart; while ((start > anchor) && (match > mStart) && (start[-1] == match[-1])) { start--; match--; matchLength++; } /* catch up */ offset_2 = offset_1; offset_1 = (U32)(offset - ZSTD_REP_MOVE); } /* store sequence */ _storeSequence : { size_t const litLength = start - anchor; ZSTD_storeSeq(seqStorePtr, litLength, anchor, (U32)offset, matchLength - MINMATCH); anchor = ip = start + matchLength; } /* check immediate repcode */ while (ip <= ilimit) { const U32 repIndex = (U32)((ip - base) - offset_2); const BYTE *const repBase = repIndex < dictLimit ? dictBase : base; const BYTE *const repMatch = repBase + repIndex; if (((U32)((dictLimit - 1) - repIndex) >= 3) & (repIndex > lowestIndex)) /* intentional overflow */ if (ZSTD_read32(ip) == ZSTD_read32(repMatch)) { /* repcode detected we should take it */ const BYTE *const repEnd = repIndex < dictLimit ? dictEnd : iend; matchLength = ZSTD_count_2segments(ip + EQUAL_READ32, repMatch + EQUAL_READ32, iend, repEnd, prefixStart) + EQUAL_READ32; offset = offset_2; offset_2 = offset_1; offset_1 = (U32)offset; /* swap offset history */ ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, matchLength - MINMATCH); ip += matchLength; anchor = ip; continue; /* faster when present ... (?) */ } break; } } /* Save reps for next block */ ctx->repToConfirm[0] = offset_1; ctx->repToConfirm[1] = offset_2; /* Last Literals */ { size_t const lastLLSize = iend - anchor; memcpy(seqStorePtr->lit, anchor, lastLLSize); seqStorePtr->lit += lastLLSize; } }

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void ZSTD_compressBlock_greedy_extDict(ZSTD_CCtx *ctx, const void *src, size_t srcSize) { ZSTD_compressBlock_lazy_extDict_generic(ctx, src, srcSize, 0, 0); }

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static void ZSTD_compressBlock_lazy_extDict(ZSTD_CCtx *ctx, const void *src, size_t srcSize) { ZSTD_compressBlock_lazy_extDict_generic(ctx, src, srcSize, 0, 1); }

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static void ZSTD_compressBlock_lazy2_extDict(ZSTD_CCtx *ctx, const void *src, size_t srcSize) { ZSTD_compressBlock_lazy_extDict_generic(ctx, src, srcSize, 0, 2); }

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static void ZSTD_compressBlock_btlazy2_extDict(ZSTD_CCtx *ctx, const void *src, size_t srcSize) { ZSTD_compressBlock_lazy_extDict_generic(ctx, src, srcSize, 1, 2); }

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/* The optimal parser */ #include "zstd_opt.h"
static void ZSTD_compressBlock_btopt(ZSTD_CCtx *ctx, const void *src, size_t srcSize) { #ifdef ZSTD_OPT_H_91842398743 ZSTD_compressBlock_opt_generic(ctx, src, srcSize, 0); #else (void)ctx; (void)src; (void)srcSize; return; #endif }

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static void ZSTD_compressBlock_btopt2(ZSTD_CCtx *ctx, const void *src, size_t srcSize) { #ifdef ZSTD_OPT_H_91842398743 ZSTD_compressBlock_opt_generic(ctx, src, srcSize, 1); #else (void)ctx; (void)src; (void)srcSize; return; #endif }

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static void ZSTD_compressBlock_btopt_extDict(ZSTD_CCtx *ctx, const void *src, size_t srcSize) { #ifdef ZSTD_OPT_H_91842398743 ZSTD_compressBlock_opt_extDict_generic(ctx, src, srcSize, 0); #else (void)ctx; (void)src; (void)srcSize; return; #endif }

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static void ZSTD_compressBlock_btopt2_extDict(ZSTD_CCtx *ctx, const void *src, size_t srcSize) { #ifdef ZSTD_OPT_H_91842398743 ZSTD_compressBlock_opt_extDict_generic(ctx, src, srcSize, 1); #else (void)ctx; (void)src; (void)srcSize; return; #endif }

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typedef void (*ZSTD_blockCompressor)(ZSTD_CCtx *ctx, const void *src, size_t srcSize);
static ZSTD_blockCompressor ZSTD_selectBlockCompressor(ZSTD_strategy strat, int extDict) { static const ZSTD_blockCompressor blockCompressor[2][8] = { {ZSTD_compressBlock_fast, ZSTD_compressBlock_doubleFast, ZSTD_compressBlock_greedy, ZSTD_compressBlock_lazy, ZSTD_compressBlock_lazy2, ZSTD_compressBlock_btlazy2, ZSTD_compressBlock_btopt, ZSTD_compressBlock_btopt2}, {ZSTD_compressBlock_fast_extDict, ZSTD_compressBlock_doubleFast_extDict, ZSTD_compressBlock_greedy_extDict, ZSTD_compressBlock_lazy_extDict, ZSTD_compressBlock_lazy2_extDict, ZSTD_compressBlock_btlazy2_extDict, ZSTD_compressBlock_btopt_extDict, ZSTD_compressBlock_btopt2_extDict}}; return blockCompressor[extDict][(U32)strat]; }

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static size_t ZSTD_compressBlock_internal(ZSTD_CCtx *zc, void *dst, size_t dstCapacity, const void *src, size_t srcSize) { ZSTD_blockCompressor const blockCompressor = ZSTD_selectBlockCompressor(zc->params.cParams.strategy, zc->lowLimit < zc->dictLimit); const BYTE *const base = zc->base; const BYTE *const istart = (const BYTE *)src; const U32 curr = (U32)(istart - base); if (srcSize < MIN_CBLOCK_SIZE + ZSTD_blockHeaderSize + 1) return 0; /* don't even attempt compression below a certain srcSize */ ZSTD_resetSeqStore(&(zc->seqStore)); if (curr > zc->nextToUpdate + 384) zc->nextToUpdate = curr - MIN(192, (U32)(curr - zc->nextToUpdate - 384)); /* update tree not updated after finding very long rep matches */ blockCompressor(zc, src, srcSize); return ZSTD_compressSequences(zc, dst, dstCapacity, srcSize); }

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/*! ZSTD_compress_generic() : * Compress a chunk of data into one or multiple blocks. * All blocks will be terminated, all input will be consumed. * Function will issue an error if there is not enough `dstCapacity` to hold the compressed content. * Frame is supposed already started (header already produced) * @return : compressed size, or an error code */
static size_t ZSTD_compress_generic(ZSTD_CCtx *cctx, void *dst, size_t dstCapacity, const void *src, size_t srcSize, U32 lastFrameChunk) { size_t blockSize = cctx->blockSize; size_t remaining = srcSize; const BYTE *ip = (const BYTE *)src; BYTE *const ostart = (BYTE *)dst; BYTE *op = ostart; U32 const maxDist = 1 << cctx->params.cParams.windowLog; if (cctx->params.fParams.checksumFlag && srcSize) xxh64_update(&cctx->xxhState, src, srcSize); while (remaining) { U32 const lastBlock = lastFrameChunk & (blockSize >= remaining); size_t cSize; if (dstCapacity < ZSTD_blockHeaderSize + MIN_CBLOCK_SIZE) return ERROR(dstSize_tooSmall); /* not enough space to store compressed block */ if (remaining < blockSize) blockSize = remaining; /* preemptive overflow correction */ if (cctx->lowLimit > (3U << 29)) { U32 const cycleMask = (1 << ZSTD_cycleLog(cctx->params.cParams.hashLog, cctx->params.cParams.strategy)) - 1; U32 const curr = (U32)(ip - cctx->base); U32 const newCurr = (curr & cycleMask) + (1 << cctx->params.cParams.windowLog); U32 const correction = curr - newCurr; ZSTD_STATIC_ASSERT(ZSTD_WINDOWLOG_MAX_64 <= 30); ZSTD_reduceIndex(cctx, correction); cctx->base += correction; cctx->dictBase += correction; cctx->lowLimit -= correction; cctx->dictLimit -= correction; if (cctx->nextToUpdate < correction) cctx->nextToUpdate = 0; else cctx->nextToUpdate -= correction; } if ((U32)(ip + blockSize - cctx->base) > cctx->loadedDictEnd + maxDist) { /* enforce maxDist */ U32 const newLowLimit = (U32)(ip + blockSize - cctx->base) - maxDist; if (cctx->lowLimit < newLowLimit) cctx->lowLimit = newLowLimit; if (cctx->dictLimit < cctx->lowLimit) cctx->dictLimit = cctx->lowLimit; } cSize = ZSTD_compressBlock_internal(cctx, op + ZSTD_blockHeaderSize, dstCapacity - ZSTD_blockHeaderSize, ip, blockSize); if (ZSTD_isError(cSize)) return cSize; if (cSize == 0) { /* block is not compressible */ U32 const cBlockHeader24 = lastBlock + (((U32)bt_raw) << 1) + (U32)(blockSize << 3); if (blockSize + ZSTD_blockHeaderSize > dstCapacity) return ERROR(dstSize_tooSmall); ZSTD_writeLE32(op, cBlockHeader24); /* no pb, 4th byte will be overwritten */ memcpy(op + ZSTD_blockHeaderSize, ip, blockSize); cSize = ZSTD_blockHeaderSize + blockSize; } else { U32 const cBlockHeader24 = lastBlock + (((U32)bt_compressed) << 1) + (U32)(cSize << 3); ZSTD_writeLE24(op, cBlockHeader24); cSize += ZSTD_blockHeaderSize; } remaining -= blockSize; dstCapacity -= cSize; ip += blockSize; op += cSize; } if (lastFrameChunk && (op > ostart)) cctx->stage = ZSTDcs_ending; return op - ostart; }

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static size_t ZSTD_writeFrameHeader(void *dst, size_t dstCapacity, ZSTD_parameters params, U64 pledgedSrcSize, U32 dictID) { BYTE *const op = (BYTE *)dst; U32 const dictIDSizeCode = (dictID > 0) + (dictID >= 256) + (dictID >= 65536); /* 0-3 */ U32 const checksumFlag = params.fParams.checksumFlag > 0; U32 const windowSize = 1U << params.cParams.windowLog; U32 const singleSegment = params.fParams.contentSizeFlag && (windowSize >= pledgedSrcSize); BYTE const windowLogByte = (BYTE)((params.cParams.windowLog - ZSTD_WINDOWLOG_ABSOLUTEMIN) << 3); U32 const fcsCode = params.fParams.contentSizeFlag ? (pledgedSrcSize >= 256) + (pledgedSrcSize >= 65536 + 256) + (pledgedSrcSize >= 0xFFFFFFFFU) : 0; /* 0-3 */ BYTE const frameHeaderDecriptionByte = (BYTE)(dictIDSizeCode + (checksumFlag << 2) + (singleSegment << 5) + (fcsCode << 6)); size_t pos; if (dstCapacity < ZSTD_frameHeaderSize_max) return ERROR(dstSize_tooSmall); ZSTD_writeLE32(dst, ZSTD_MAGICNUMBER); op[4] = frameHeaderDecriptionByte; pos = 5; if (!singleSegment) op[pos++] = windowLogByte; switch (dictIDSizeCode) { default: /* impossible */ case 0: break; case 1: op[pos] = (BYTE)(dictID); pos++; break; case 2: ZSTD_writeLE16(op + pos, (U16)dictID); pos += 2; break; case 3: ZSTD_writeLE32(op + pos, dictID); pos += 4; break; } switch (fcsCode) { default: /* impossible */ case 0: if (singleSegment) op[pos++] = (BYTE)(pledgedSrcSize); break; case 1: ZSTD_writeLE16(op + pos, (U16)(pledgedSrcSize - 256)); pos += 2; break; case 2: ZSTD_writeLE32(op + pos, (U32)(pledgedSrcSize)); pos += 4; break; case 3: ZSTD_writeLE64(op + pos, (U64)(pledgedSrcSize)); pos += 8; break; } return pos; }

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static size_t ZSTD_compressContinue_internal(ZSTD_CCtx *cctx, void *dst, size_t dstCapacity, const void *src, size_t srcSize, U32 frame, U32 lastFrameChunk) { const BYTE *const ip = (const BYTE *)src; size_t fhSize = 0; if (cctx->stage == ZSTDcs_created) return ERROR(stage_wrong); /* missing init (ZSTD_compressBegin) */ if (frame && (cctx->stage == ZSTDcs_init)) { fhSize = ZSTD_writeFrameHeader(dst, dstCapacity, cctx->params, cctx->frameContentSize, cctx->dictID); if (ZSTD_isError(fhSize)) return fhSize; dstCapacity -= fhSize; dst = (char *)dst + fhSize; cctx->stage = ZSTDcs_ongoing; } /* Check if blocks follow each other */ if (src != cctx->nextSrc) { /* not contiguous */ ptrdiff_t const delta = cctx->nextSrc - ip; cctx->lowLimit = cctx->dictLimit; cctx->dictLimit = (U32)(cctx->nextSrc - cctx->base); cctx->dictBase = cctx->base; cctx->base -= delta; cctx->nextToUpdate = cctx->dictLimit; if (cctx->dictLimit - cctx->lowLimit < HASH_READ_SIZE) cctx->lowLimit = cctx->dictLimit; /* too small extDict */ } /* if input and dictionary overlap : reduce dictionary (area presumed modified by input) */ if ((ip + srcSize > cctx->dictBase + cctx->lowLimit) & (ip < cctx->dictBase + cctx->dictLimit)) { ptrdiff_t const highInputIdx = (ip + srcSize) - cctx->dictBase; U32 const lowLimitMax = (highInputIdx > (ptrdiff_t)cctx->dictLimit) ? cctx->dictLimit : (U32)highInputIdx; cctx->lowLimit = lowLimitMax; } cctx->nextSrc = ip + srcSize; if (srcSize) { size_t const cSize = frame ? ZSTD_compress_generic(cctx, dst, dstCapacity, src, srcSize, lastFrameChunk) : ZSTD_compressBlock_internal(cctx, dst, dstCapacity, src, srcSize); if (ZSTD_isError(cSize)) return cSize; return cSize + fhSize; } else return fhSize; }

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size_t ZSTD_compressContinue(ZSTD_CCtx *cctx, void *dst, size_t dstCapacity, const void *src, size_t srcSize) { return ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 1, 0); }

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size_t ZSTD_getBlockSizeMax(ZSTD_CCtx *cctx) { return MIN(ZSTD_BLOCKSIZE_ABSOLUTEMAX, 1 << cctx->params.cParams.windowLog); }

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size_t ZSTD_compressBlock(ZSTD_CCtx *cctx, void *dst, size_t dstCapacity, const void *src, size_t srcSize) { size_t const blockSizeMax = ZSTD_getBlockSizeMax(cctx); if (srcSize > blockSizeMax) return ERROR(srcSize_wrong); return ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 0, 0); }

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/*! ZSTD_loadDictionaryContent() : * @return : 0, or an error code */
static size_t ZSTD_loadDictionaryContent(ZSTD_CCtx *zc, const void *src, size_t srcSize) { const BYTE *const ip = (const BYTE *)src; const BYTE *const iend = ip + srcSize; /* input becomes curr prefix */ zc->lowLimit = zc->dictLimit; zc->dictLimit = (U32)(zc->nextSrc - zc->base); zc->dictBase = zc->base; zc->base += ip - zc->nextSrc; zc->nextToUpdate = zc->dictLimit; zc->loadedDictEnd = zc->forceWindow ? 0 : (U32)(iend - zc->base); zc->nextSrc = iend; if (srcSize <= HASH_READ_SIZE) return 0; switch (zc->params.cParams.strategy) { case ZSTD_fast: ZSTD_fillHashTable(zc, iend, zc->params.cParams.searchLength); break; case ZSTD_dfast: ZSTD_fillDoubleHashTable(zc, iend, zc->params.cParams.searchLength); break; case ZSTD_greedy: case ZSTD_lazy: case ZSTD_lazy2: if (srcSize >= HASH_READ_SIZE) ZSTD_insertAndFindFirstIndex(zc, iend - HASH_READ_SIZE, zc->params.cParams.searchLength); break; case ZSTD_btlazy2: case ZSTD_btopt: case ZSTD_btopt2: if (srcSize >= HASH_READ_SIZE) ZSTD_updateTree(zc, iend - HASH_READ_SIZE, iend, 1 << zc->params.cParams.searchLog, zc->params.cParams.searchLength); break; default: return ERROR(GENERIC); /* strategy doesn't exist; impossible */ } zc->nextToUpdate = (U32)(iend - zc->base); return 0; }

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/* Dictionaries that assign zero probability to symbols that show up causes problems when FSE encoding. Refuse dictionaries that assign zero probability to symbols that we may encounter during compression. NOTE: This behavior is not standard and could be improved in the future. */
static size_t ZSTD_checkDictNCount(short *normalizedCounter, unsigned dictMaxSymbolValue, unsigned maxSymbolValue) { U32 s; if (dictMaxSymbolValue < maxSymbolValue) return ERROR(dictionary_corrupted); for (s = 0; s <= maxSymbolValue; ++s) { if (normalizedCounter[s] == 0) return ERROR(dictionary_corrupted); } return 0; }

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/* Dictionary format : * See : * https://github.com/facebook/zstd/blob/master/doc/zstd_compression_format.md#dictionary-format */ /*! ZSTD_loadZstdDictionary() : * @return : 0, or an error code * assumptions : magic number supposed already checked * dictSize supposed > 8 */
static size_t ZSTD_loadZstdDictionary(ZSTD_CCtx *cctx, const void *dict, size_t dictSize) { const BYTE *dictPtr = (const BYTE *)dict; const BYTE *const dictEnd = dictPtr + dictSize; short offcodeNCount[MaxOff + 1]; unsigned offcodeMaxValue = MaxOff; dictPtr += 4; /* skip magic number */ cctx->dictID = cctx->params.fParams.noDictIDFlag ? 0 : ZSTD_readLE32(dictPtr); dictPtr += 4; { size_t const hufHeaderSize = HUF_readCTable_wksp(cctx->hufTable, 255, dictPtr, dictEnd - dictPtr, cctx->tmpCounters, sizeof(cctx->tmpCounters)); if (HUF_isError(hufHeaderSize)) return ERROR(dictionary_corrupted); dictPtr += hufHeaderSize; } { unsigned offcodeLog; size_t const offcodeHeaderSize = FSE_readNCount(offcodeNCount, &offcodeMaxValue, &offcodeLog, dictPtr, dictEnd - dictPtr); if (FSE_isError(offcodeHeaderSize)) return ERROR(dictionary_corrupted); if (offcodeLog > OffFSELog) return ERROR(dictionary_corrupted); /* Defer checking offcodeMaxValue because we need to know the size of the dictionary content */ CHECK_E(FSE_buildCTable_wksp(cctx->offcodeCTable, offcodeNCount, offcodeMaxValue, offcodeLog, cctx->tmpCounters, sizeof(cctx->tmpCounters)), dictionary_corrupted); dictPtr += offcodeHeaderSize; } { short matchlengthNCount[MaxML + 1]; unsigned matchlengthMaxValue = MaxML, matchlengthLog; size_t const matchlengthHeaderSize = FSE_readNCount(matchlengthNCount, &matchlengthMaxValue, &matchlengthLog, dictPtr, dictEnd - dictPtr); if (FSE_isError(matchlengthHeaderSize)) return ERROR(dictionary_corrupted); if (matchlengthLog > MLFSELog) return ERROR(dictionary_corrupted); /* Every match length code must have non-zero probability */ CHECK_F(ZSTD_checkDictNCount(matchlengthNCount, matchlengthMaxValue, MaxML)); CHECK_E( FSE_buildCTable_wksp(cctx->matchlengthCTable, matchlengthNCount, matchlengthMaxValue, matchlengthLog, cctx->tmpCounters, sizeof(cctx->tmpCounters)), dictionary_corrupted); dictPtr += matchlengthHeaderSize; } { short litlengthNCount[MaxLL + 1]; unsigned litlengthMaxValue = MaxLL, litlengthLog; size_t const litlengthHeaderSize = FSE_readNCount(litlengthNCount, &litlengthMaxValue, &litlengthLog, dictPtr, dictEnd - dictPtr); if (FSE_isError(litlengthHeaderSize)) return ERROR(dictionary_corrupted); if (litlengthLog > LLFSELog) return ERROR(dictionary_corrupted); /* Every literal length code must have non-zero probability */ CHECK_F(ZSTD_checkDictNCount(litlengthNCount, litlengthMaxValue, MaxLL)); CHECK_E(FSE_buildCTable_wksp(cctx->litlengthCTable, litlengthNCount, litlengthMaxValue, litlengthLog, cctx->tmpCounters, sizeof(cctx->tmpCounters)), dictionary_corrupted); dictPtr += litlengthHeaderSize; } if (dictPtr + 12 > dictEnd) return ERROR(dictionary_corrupted); cctx->rep[0] = ZSTD_readLE32(dictPtr + 0); cctx->rep[1] = ZSTD_readLE32(dictPtr + 4); cctx->rep[2] = ZSTD_readLE32(dictPtr + 8); dictPtr += 12; { size_t const dictContentSize = (size_t)(dictEnd - dictPtr); U32 offcodeMax = MaxOff; if (dictContentSize <= ((U32)-1) - 128 KB) { U32 const maxOffset = (U32)dictContentSize + 128 KB; /* The maximum offset that must be supported */ offcodeMax = ZSTD_highbit32(maxOffset); /* Calculate minimum offset code required to represent maxOffset */ } /* All offset values <= dictContentSize + 128 KB must be representable */ CHECK_F(ZSTD_checkDictNCount(offcodeNCount, offcodeMaxValue, MIN(offcodeMax, MaxOff))); /* All repCodes must be <= dictContentSize and != 0*/ { U32 u; for (u = 0; u < 3; u++) { if (cctx->rep[u] == 0) return ERROR(dictionary_corrupted); if (cctx->rep[u] > dictContentSize) return ERROR(dictionary_corrupted); } } cctx->flagStaticTables = 1; cctx->flagStaticHufTable = HUF_repeat_valid; return ZSTD_loadDictionaryContent(cctx, dictPtr, dictContentSize); } }

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/** ZSTD_compress_insertDictionary() : * @return : 0, or an error code */
static size_t ZSTD_compress_insertDictionary(ZSTD_CCtx *cctx, const void *dict, size_t dictSize) { if ((dict == NULL) || (dictSize <= 8)) return 0; /* dict as pure content */ if ((ZSTD_readLE32(dict) != ZSTD_DICT_MAGIC) || (cctx->forceRawDict)) return ZSTD_loadDictionaryContent(cctx, dict, dictSize); /* dict as zstd dictionary */ return ZSTD_loadZstdDictionary(cctx, dict, dictSize); }

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/*! ZSTD_compressBegin_internal() : * @return : 0, or an error code */
static size_t ZSTD_compressBegin_internal(ZSTD_CCtx *cctx, const void *dict, size_t dictSize, ZSTD_parameters params, U64 pledgedSrcSize) { ZSTD_compResetPolicy_e const crp = dictSize ? ZSTDcrp_fullReset : ZSTDcrp_continue; CHECK_F(ZSTD_resetCCtx_advanced(cctx, params, pledgedSrcSize, crp)); return ZSTD_compress_insertDictionary(cctx, dict, dictSize); }

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/*! ZSTD_compressBegin_advanced() : * @return : 0, or an error code */
size_t ZSTD_compressBegin_advanced(ZSTD_CCtx *cctx, const void *dict, size_t dictSize, ZSTD_parameters params, unsigned long long pledgedSrcSize) { /* compression parameters verification and optimization */ CHECK_F(ZSTD_checkCParams(params.cParams)); return ZSTD_compressBegin_internal(cctx, dict, dictSize, params, pledgedSrcSize); }

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size_t ZSTD_compressBegin_usingDict(ZSTD_CCtx *cctx, const void *dict, size_t dictSize, int compressionLevel) { ZSTD_parameters const params = ZSTD_getParams(compressionLevel, 0, dictSize); return ZSTD_compressBegin_internal(cctx, dict, dictSize, params, 0); }

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size_t ZSTD_compressBegin(ZSTD_CCtx *cctx, int compressionLevel) { return ZSTD_compressBegin_usingDict(cctx, NULL, 0, compressionLevel); }

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/*! ZSTD_writeEpilogue() : * Ends a frame. * @return : nb of bytes written into dst (or an error code) */
static size_t ZSTD_writeEpilogue(ZSTD_CCtx *cctx, void *dst, size_t dstCapacity) { BYTE *const ostart = (BYTE *)dst; BYTE *op = ostart; size_t fhSize = 0; if (cctx->stage == ZSTDcs_created) return ERROR(stage_wrong); /* init missing */ /* special case : empty frame */ if (cctx->stage == ZSTDcs_init) { fhSize = ZSTD_writeFrameHeader(dst, dstCapacity, cctx->params, 0, 0); if (ZSTD_isError(fhSize)) return fhSize; dstCapacity -= fhSize; op += fhSize; cctx->stage = ZSTDcs_ongoing; } if (cctx->stage != ZSTDcs_ending) { /* write one last empty block, make it the "last" block */ U32 const cBlockHeader24 = 1 /* last block */ + (((U32)bt_raw) << 1) + 0; if (dstCapacity < 4) return ERROR(dstSize_tooSmall); ZSTD_writeLE32(op, cBlockHeader24); op += ZSTD_blockHeaderSize; dstCapacity -= ZSTD_blockHeaderSize; } if (cctx->params.fParams.checksumFlag) { U32 const checksum = (U32)xxh64_digest(&cctx->xxhState); if (dstCapacity < 4) return ERROR(dstSize_tooSmall); ZSTD_writeLE32(op, checksum); op += 4; } cctx->stage = ZSTDcs_created; /* return to "created but no init" status */ return op - ostart; }

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size_t ZSTD_compressEnd(ZSTD_CCtx *cctx, void *dst, size_t dstCapacity, const void *src, size_t srcSize) { size_t endResult; size_t const cSize = ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 1, 1); if (ZSTD_isError(cSize)) return cSize; endResult = ZSTD_writeEpilogue(cctx, (char *)dst + cSize, dstCapacity - cSize); if (ZSTD_isError(endResult)) return endResult; return cSize + endResult; }

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static size_t ZSTD_compress_internal(ZSTD_CCtx *cctx, void *dst, size_t dstCapacity, const void *src, size_t srcSize, const void *dict, size_t dictSize, ZSTD_parameters params) { CHECK_F(ZSTD_compressBegin_internal(cctx, dict, dictSize, params, srcSize)); return ZSTD_compressEnd(cctx, dst, dstCapacity, src, srcSize); }

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size_t ZSTD_compress_usingDict(ZSTD_CCtx *ctx, void *dst, size_t dstCapacity, const void *src, size_t srcSize, const void *dict, size_t dictSize, ZSTD_parameters params) { return ZSTD_compress_internal(ctx, dst, dstCapacity, src, srcSize, dict, dictSize, params); }

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size_t ZSTD_compressCCtx(ZSTD_CCtx *ctx, void *dst, size_t dstCapacity, const void *src, size_t srcSize, ZSTD_parameters params) { return ZSTD_compress_internal(ctx, dst, dstCapacity, src, srcSize, NULL, 0, params); }

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/* ===== Dictionary API ===== */ struct ZSTD_CDict_s { void *dictBuffer; const void *dictContent; size_t dictContentSize; ZSTD_CCtx *refContext; }; /* typedef'd tp ZSTD_CDict within "zstd.h" */
size_t ZSTD_CDictWorkspaceBound(ZSTD_compressionParameters cParams) { return ZSTD_CCtxWorkspaceBound(cParams) + ZSTD_ALIGN(sizeof(ZSTD_CDict)); }

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static ZSTD_CDict *ZSTD_createCDict_advanced(const void *dictBuffer, size_t dictSize, unsigned byReference, ZSTD_parameters params, ZSTD_customMem customMem) { if (!customMem.customAlloc || !customMem.customFree) return NULL; { ZSTD_CDict *const cdict = (ZSTD_CDict *)ZSTD_malloc(sizeof(ZSTD_CDict), customMem); ZSTD_CCtx *const cctx = ZSTD_createCCtx_advanced(customMem); if (!cdict || !cctx) { ZSTD_free(cdict, customMem); ZSTD_freeCCtx(cctx); return NULL; } if ((byReference) || (!dictBuffer) || (!dictSize)) { cdict->dictBuffer = NULL; cdict->dictContent = dictBuffer; } else { void *const internalBuffer = ZSTD_malloc(dictSize, customMem); if (!internalBuffer) { ZSTD_free(cctx, customMem); ZSTD_free(cdict, customMem); return NULL; } memcpy(internalBuffer, dictBuffer, dictSize); cdict->dictBuffer = internalBuffer; cdict->dictContent = internalBuffer; } { size_t const errorCode = ZSTD_compressBegin_advanced(cctx, cdict->dictContent, dictSize, params, 0); if (ZSTD_isError(errorCode)) { ZSTD_free(cdict->dictBuffer, customMem); ZSTD_free(cdict, customMem); ZSTD_freeCCtx(cctx); return NULL; } } cdict->refContext = cctx; cdict->dictContentSize = dictSize; return cdict; } }

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ZSTD_CDict *ZSTD_initCDict(const void *dict, size_t dictSize, ZSTD_parameters params, void *workspace, size_t workspaceSize) { ZSTD_customMem const stackMem = ZSTD_initStack(workspace, workspaceSize); return ZSTD_createCDict_advanced(dict, dictSize, 1, params, stackMem); }

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size_t ZSTD_freeCDict(ZSTD_CDict *cdict) { if (cdict == NULL) return 0; /* support free on NULL */ { ZSTD_customMem const cMem = cdict->refContext->customMem; ZSTD_freeCCtx(cdict->refContext); ZSTD_free(cdict->dictBuffer, cMem); ZSTD_free(cdict, cMem); return 0; } }

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static ZSTD_parameters ZSTD_getParamsFromCDict(const ZSTD_CDict *cdict) { return ZSTD_getParamsFromCCtx(cdict->refContext); }

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size_t ZSTD_compressBegin_usingCDict(ZSTD_CCtx *cctx, const ZSTD_CDict *cdict, unsigned long long pledgedSrcSize) { if (cdict->dictContentSize) CHECK_F(ZSTD_copyCCtx(cctx, cdict->refContext, pledgedSrcSize)) else { ZSTD_parameters params = cdict->refContext->params; params.fParams.contentSizeFlag = (pledgedSrcSize > 0); CHECK_F(ZSTD_compressBegin_advanced(cctx, NULL, 0, params, pledgedSrcSize)); } return 0; }

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/*! ZSTD_compress_usingCDict() : * Compression using a digested Dictionary. * Faster startup than ZSTD_compress_usingDict(), recommended when same dictionary is used multiple times. * Note that compression level is decided during dictionary creation */
size_t ZSTD_compress_usingCDict(ZSTD_CCtx *cctx, void *dst, size_t dstCapacity, const void *src, size_t srcSize, const ZSTD_CDict *cdict) { CHECK_F(ZSTD_compressBegin_usingCDict(cctx, cdict, srcSize)); if (cdict->refContext->params.fParams.contentSizeFlag == 1) { cctx->params.fParams.contentSizeFlag = 1; cctx->frameContentSize = srcSize; } else { cctx->params.fParams.contentSizeFlag = 0; } return ZSTD_compressEnd(cctx, dst, dstCapacity, src, srcSize); }

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/* ****************************************************************** * Streaming ********************************************************************/ typedef enum { zcss_init, zcss_load, zcss_flush, zcss_final } ZSTD_cStreamStage; struct ZSTD_CStream_s { ZSTD_CCtx *cctx; ZSTD_CDict *cdictLocal; const ZSTD_CDict *cdict; char *inBuff; size_t inBuffSize; size_t inToCompress; size_t inBuffPos; size_t inBuffTarget; size_t blockSize; char *outBuff; size_t outBuffSize; size_t outBuffContentSize; size_t outBuffFlushedSize; ZSTD_cStreamStage stage; U32 checksum; U32 frameEnded; U64 pledgedSrcSize; U64 inputProcessed; ZSTD_parameters params; ZSTD_customMem customMem; }; /* typedef'd to ZSTD_CStream within "zstd.h" */
size_t ZSTD_CStreamWorkspaceBound(ZSTD_compressionParameters cParams) { size_t const inBuffSize = (size_t)1 << cParams.windowLog; size_t const blockSize = MIN(ZSTD_BLOCKSIZE_ABSOLUTEMAX, inBuffSize); size_t const outBuffSize = ZSTD_compressBound(blockSize) + 1; return ZSTD_CCtxWorkspaceBound(cParams) + ZSTD_ALIGN(sizeof(ZSTD_CStream)) + ZSTD_ALIGN(inBuffSize) + ZSTD_ALIGN(outBuffSize); }

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ZSTD_CStream *ZSTD_createCStream_advanced(ZSTD_customMem customMem) { ZSTD_CStream *zcs; if (!customMem.customAlloc || !customMem.customFree) return NULL; zcs = (ZSTD_CStream *)ZSTD_malloc(sizeof(ZSTD_CStream), customMem); if (zcs == NULL) return NULL; memset(zcs, 0, sizeof(ZSTD_CStream)); memcpy(&zcs->customMem, &customMem, sizeof(ZSTD_customMem)); zcs->cctx = ZSTD_createCCtx_advanced(customMem); if (zcs->cctx == NULL) { ZSTD_freeCStream(zcs); return NULL; } return zcs; }

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size_t ZSTD_freeCStream(ZSTD_CStream *zcs) { if (zcs == NULL) return 0; /* support free on NULL */ { ZSTD_customMem const cMem = zcs->customMem; ZSTD_freeCCtx(zcs->cctx); zcs->cctx = NULL; ZSTD_freeCDict(zcs->cdictLocal); zcs->cdictLocal = NULL; ZSTD_free(zcs->inBuff, cMem); zcs->inBuff = NULL; ZSTD_free(zcs->outBuff, cMem); zcs->outBuff = NULL; ZSTD_free(zcs, cMem); return 0; } }

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/*====== Initialization ======*/
size_t ZSTD_CStreamInSize(void) { return ZSTD_BLOCKSIZE_ABSOLUTEMAX; }

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size_t ZSTD_CStreamOutSize(void) { return ZSTD_compressBound(ZSTD_BLOCKSIZE_ABSOLUTEMAX) + ZSTD_blockHeaderSize + 4 /* 32-bits hash */; }

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static size_t ZSTD_resetCStream_internal(ZSTD_CStream *zcs, unsigned long long pledgedSrcSize) { if (zcs->inBuffSize == 0) return ERROR(stage_wrong); /* zcs has not been init at least once => can't reset */ if (zcs->cdict) CHECK_F(ZSTD_compressBegin_usingCDict(zcs->cctx, zcs->cdict, pledgedSrcSize)) else CHECK_F(ZSTD_compressBegin_advanced(zcs->cctx, NULL, 0, zcs->params, pledgedSrcSize)); zcs->inToCompress = 0; zcs->inBuffPos = 0; zcs->inBuffTarget = zcs->blockSize; zcs->outBuffContentSize = zcs->outBuffFlushedSize = 0; zcs->stage = zcss_load; zcs->frameEnded = 0; zcs->pledgedSrcSize = pledgedSrcSize; zcs->inputProcessed = 0; return 0; /* ready to go */ }

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size_t ZSTD_resetCStream(ZSTD_CStream *zcs, unsigned long long pledgedSrcSize) { zcs->params.fParams.contentSizeFlag = (pledgedSrcSize > 0); return ZSTD_resetCStream_internal(zcs, pledgedSrcSize); }

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static size_t ZSTD_initCStream_advanced(ZSTD_CStream *zcs, const void *dict, size_t dictSize, ZSTD_parameters params, unsigned long long pledgedSrcSize) { /* allocate buffers */ { size_t const neededInBuffSize = (size_t)1 << params.cParams.windowLog; if (zcs->inBuffSize < neededInBuffSize) { zcs->inBuffSize = neededInBuffSize; ZSTD_free(zcs->inBuff, zcs->customMem); zcs->inBuff = (char *)ZSTD_malloc(neededInBuffSize, zcs->customMem); if (zcs->inBuff == NULL) return ERROR(memory_allocation); } zcs->blockSize = MIN(ZSTD_BLOCKSIZE_ABSOLUTEMAX, neededInBuffSize); } if (zcs->outBuffSize < ZSTD_compressBound(zcs->blockSize) + 1) { zcs->outBuffSize = ZSTD_compressBound(zcs->blockSize) + 1; ZSTD_free(zcs->outBuff, zcs->customMem); zcs->outBuff = (char *)ZSTD_malloc(zcs->outBuffSize, zcs->customMem); if (zcs->outBuff == NULL) return ERROR(memory_allocation); } if (dict && dictSize >= 8) { ZSTD_freeCDict(zcs->cdictLocal); zcs->cdictLocal = ZSTD_createCDict_advanced(dict, dictSize, 0, params, zcs->customMem); if (zcs->cdictLocal == NULL) return ERROR(memory_allocation); zcs->cdict = zcs->cdictLocal; } else zcs->cdict = NULL; zcs->checksum = params.fParams.checksumFlag > 0; zcs->params = params; return ZSTD_resetCStream_internal(zcs, pledgedSrcSize); }

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ZSTD_CStream *ZSTD_initCStream(ZSTD_parameters params, unsigned long long pledgedSrcSize, void *workspace, size_t workspaceSize) { ZSTD_customMem const stackMem = ZSTD_initStack(workspace, workspaceSize); ZSTD_CStream *const zcs = ZSTD_createCStream_advanced(stackMem); if (zcs) { size_t const code = ZSTD_initCStream_advanced(zcs, NULL, 0, params, pledgedSrcSize); if (ZSTD_isError(code)) { return NULL; } } return zcs; }

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ZSTD_CStream *ZSTD_initCStream_usingCDict(const ZSTD_CDict *cdict, unsigned long long pledgedSrcSize, void *workspace, size_t workspaceSize) { ZSTD_parameters const params = ZSTD_getParamsFromCDict(cdict); ZSTD_CStream *const zcs = ZSTD_initCStream(params, pledgedSrcSize, workspace, workspaceSize); if (zcs) { zcs->cdict = cdict; if (ZSTD_isError(ZSTD_resetCStream_internal(zcs, pledgedSrcSize))) { return NULL; } } return zcs; }

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/*====== Compression ======*/ typedef enum { zsf_gather, zsf_flush, zsf_end } ZSTD_flush_e;
ZSTD_STATIC size_t ZSTD_limitCopy(void *dst, size_t dstCapacity, const void *src, size_t srcSize) { size_t const length = MIN(dstCapacity, srcSize); memcpy(dst, src, length); return length; }

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static size_t ZSTD_compressStream_generic(ZSTD_CStream *zcs, void *dst, size_t *dstCapacityPtr, const void *src, size_t *srcSizePtr, ZSTD_flush_e const flush) { U32 someMoreWork = 1; const char *const istart = (const char *)src; const char *const iend = istart + *srcSizePtr; const char *ip = istart; char *const ostart = (char *)dst; char *const oend = ostart + *dstCapacityPtr; char *op = ostart; while (someMoreWork) { switch (zcs->stage) { case zcss_init: return ERROR(init_missing); /* call ZBUFF_compressInit() first ! */ case zcss_load: /* complete inBuffer */ { size_t const toLoad = zcs->inBuffTarget - zcs->inBuffPos; size_t const loaded = ZSTD_limitCopy(zcs->inBuff + zcs->inBuffPos, toLoad, ip, iend - ip); zcs->inBuffPos += loaded; ip += loaded; if ((zcs->inBuffPos == zcs->inToCompress) || (!flush && (toLoad != loaded))) { someMoreWork = 0; break; /* not enough input to get a full block : stop there, wait for more */ } } /* compress curr block (note : this stage cannot be stopped in the middle) */ { void *cDst; size_t cSize; size_t const iSize = zcs->inBuffPos - zcs->inToCompress; size_t oSize = oend - op; if (oSize >= ZSTD_compressBound(iSize)) cDst = op; /* compress directly into output buffer (avoid flush stage) */ else cDst = zcs->outBuff, oSize = zcs->outBuffSize; cSize = (flush == zsf_end) ? ZSTD_compressEnd(zcs->cctx, cDst, oSize, zcs->inBuff + zcs->inToCompress, iSize) : ZSTD_compressContinue(zcs->cctx, cDst, oSize, zcs->inBuff + zcs->inToCompress, iSize); if (ZSTD_isError(cSize)) return cSize; if (flush == zsf_end) zcs->frameEnded = 1; /* prepare next block */ zcs->inBuffTarget = zcs->inBuffPos + zcs->blockSize; if (zcs->inBuffTarget > zcs->inBuffSize) zcs->inBuffPos = 0, zcs->inBuffTarget = zcs->blockSize; /* note : inBuffSize >= blockSize */ zcs->inToCompress = zcs->inBuffPos; if (cDst == op) { op += cSize; break; } /* no need to flush */ zcs->outBuffContentSize = cSize; zcs->outBuffFlushedSize = 0; zcs->stage = zcss_flush; /* pass-through to flush stage */ } case zcss_flush: { size_t const toFlush = zcs->outBuffContentSize - zcs->outBuffFlushedSize; size_t const flushed = ZSTD_limitCopy(op, oend - op, zcs->outBuff + zcs->outBuffFlushedSize, toFlush); op += flushed; zcs->outBuffFlushedSize += flushed; if (toFlush != flushed) { someMoreWork = 0; break; } /* dst too small to store flushed data : stop there */ zcs->outBuffContentSize = zcs->outBuffFlushedSize = 0; zcs->stage = zcss_load; break; } case zcss_final: someMoreWork = 0; /* do nothing */ break; default: return ERROR(GENERIC); /* impossible */ } } *srcSizePtr = ip - istart; *dstCapacityPtr = op - ostart; zcs->inputProcessed += *srcSizePtr; if (zcs->frameEnded) return 0; { size_t hintInSize = zcs->inBuffTarget - zcs->inBuffPos; if (hintInSize == 0) hintInSize = zcs->blockSize; return hintInSize; } }

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size_t ZSTD_compressStream(ZSTD_CStream *zcs, ZSTD_outBuffer *output, ZSTD_inBuffer *input) { size_t sizeRead = input->size - input->pos; size_t sizeWritten = output->size - output->pos; size_t const result = ZSTD_compressStream_generic(zcs, (char *)(output->dst) + output->pos, &sizeWritten, (const char *)(input->src) + input->pos, &sizeRead, zsf_gather); input->pos += sizeRead; output->pos += sizeWritten; return result; }

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/*====== Finalize ======*/ /*! ZSTD_flushStream() : * @return : amount of data remaining to flush */
size_t ZSTD_flushStream(ZSTD_CStream *zcs, ZSTD_outBuffer *output) { size_t srcSize = 0; size_t sizeWritten = output->size - output->pos; size_t const result = ZSTD_compressStream_generic(zcs, (char *)(output->dst) + output->pos, &sizeWritten, &srcSize, &srcSize, /* use a valid src address instead of NULL */ zsf_flush); output->pos += sizeWritten; if (ZSTD_isError(result)) return result; return zcs->outBuffContentSize - zcs->outBuffFlushedSize; /* remaining to flush */ }

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size_t ZSTD_endStream(ZSTD_CStream *zcs, ZSTD_outBuffer *output) { BYTE *const ostart = (BYTE *)(output->dst) + output->pos; BYTE *const oend = (BYTE *)(output->dst) + output->size; BYTE *op = ostart; if ((zcs->pledgedSrcSize) && (zcs->inputProcessed != zcs->pledgedSrcSize)) return ERROR(srcSize_wrong); /* pledgedSrcSize not respected */ if (zcs->stage != zcss_final) { /* flush whatever remains */ size_t srcSize = 0; size_t sizeWritten = output->size - output->pos; size_t const notEnded = ZSTD_compressStream_generic(zcs, ostart, &sizeWritten, &srcSize, &srcSize, zsf_end); /* use a valid src address instead of NULL */ size_t const remainingToFlush = zcs->outBuffContentSize - zcs->outBuffFlushedSize; op += sizeWritten; if (remainingToFlush) { output->pos += sizeWritten; return remainingToFlush + ZSTD_BLOCKHEADERSIZE /* final empty block */ + (zcs->checksum * 4); } /* create epilogue */ zcs->stage = zcss_final; zcs->outBuffContentSize = !notEnded ? 0 : ZSTD_compressEnd(zcs->cctx, zcs->outBuff, zcs->outBuffSize, NULL, 0); /* write epilogue, including final empty block, into outBuff */ } /* flush epilogue */ { size_t const toFlush = zcs->outBuffContentSize - zcs->outBuffFlushedSize; size_t const flushed = ZSTD_limitCopy(op, oend - op, zcs->outBuff + zcs->outBuffFlushedSize, toFlush); op += flushed; zcs->outBuffFlushedSize += flushed; output->pos += op - ostart; if (toFlush == flushed) zcs->stage = zcss_init; /* end reached */ return toFlush - flushed; } }

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/*-===== Pre-defined compression levels =====-*/ #define ZSTD_DEFAULT_CLEVEL 1 #define ZSTD_MAX_CLEVEL 22
int ZSTD_maxCLevel(void) { return ZSTD_MAX_CLEVEL; }

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static const ZSTD_compressionParameters ZSTD_defaultCParameters[4][ZSTD_MAX_CLEVEL + 1] = { { /* "default" */ /* W, C, H, S, L, TL, strat */ {18, 12, 12, 1, 7, 16, ZSTD_fast}, /* level 0 - never used */ {19, 13, 14, 1, 7, 16, ZSTD_fast}, /* level 1 */ {19, 15, 16, 1, 6, 16, ZSTD_fast}, /* level 2 */ {20, 16, 17, 1, 5, 16, ZSTD_dfast}, /* level 3.*/ {20, 18, 18, 1, 5, 16, ZSTD_dfast}, /* level 4.*/ {20, 15, 18, 3, 5, 16, ZSTD_greedy}, /* level 5 */ {21, 16, 19, 2, 5, 16, ZSTD_lazy}, /* level 6 */ {21, 17, 20, 3, 5, 16, ZSTD_lazy}, /* level 7 */ {21, 18, 20, 3, 5, 16, ZSTD_lazy2}, /* level 8 */ {21, 20, 20, 3, 5, 16, ZSTD_lazy2}, /* level 9 */ {21, 19, 21, 4, 5, 16, ZSTD_lazy2}, /* level 10 */ {22, 20, 22, 4, 5, 16, ZSTD_lazy2}, /* level 11 */ {22, 20, 22, 5, 5, 16, ZSTD_lazy2}, /* level 12 */ {22, 21, 22, 5, 5, 16, ZSTD_lazy2}, /* level 13 */ {22, 21, 22, 6, 5, 16, ZSTD_lazy2}, /* level 14 */ {22, 21, 21, 5, 5, 16, ZSTD_btlazy2}, /* level 15 */ {23, 22, 22, 5, 5, 16, ZSTD_btlazy2}, /* level 16 */ {23, 21, 22, 4, 5, 24, ZSTD_btopt}, /* level 17 */ {23, 23, 22, 6, 5, 32, ZSTD_btopt}, /* level 18 */ {23, 23, 22, 6, 3, 48, ZSTD_btopt}, /* level 19 */ {25, 25, 23, 7, 3, 64, ZSTD_btopt2}, /* level 20 */ {26, 26, 23, 7, 3, 256, ZSTD_btopt2}, /* level 21 */ {27, 27, 25, 9, 3, 512, ZSTD_btopt2}, /* level 22 */ }, { /* for srcSize <= 256 KB */ /* W, C, H, S, L, T, strat */ {0, 0, 0, 0, 0, 0, ZSTD_fast}, /* level 0 - not used */ {18, 13, 14, 1, 6, 8, ZSTD_fast}, /* level 1 */ {18, 14, 13, 1, 5, 8, ZSTD_dfast}, /* level 2 */ {18, 16, 15, 1, 5, 8, ZSTD_dfast}, /* level 3 */ {18, 15, 17, 1, 5, 8, ZSTD_greedy}, /* level 4.*/ {18, 16, 17, 4, 5, 8, ZSTD_greedy}, /* level 5.*/ {18, 16, 17, 3, 5, 8, ZSTD_lazy}, /* level 6.*/ {18, 17, 17, 4, 4, 8, ZSTD_lazy}, /* level 7 */ {18, 17, 17, 4, 4, 8, ZSTD_lazy2}, /* level 8 */ {18, 17, 17, 5, 4, 8, ZSTD_lazy2}, /* level 9 */ {18, 17, 17, 6, 4, 8, ZSTD_lazy2}, /* level 10 */ {18, 18, 17, 6, 4, 8, ZSTD_lazy2}, /* level 11.*/ {18, 18, 17, 7, 4, 8, ZSTD_lazy2}, /* level 12.*/ {18, 19, 17, 6, 4, 8, ZSTD_btlazy2}, /* level 13 */ {18, 18, 18, 4, 4, 16, ZSTD_btopt}, /* level 14.*/ {18, 18, 18, 4, 3, 16, ZSTD_btopt}, /* level 15.*/ {18, 19, 18, 6, 3, 32, ZSTD_btopt}, /* level 16.*/ {18, 19, 18, 8, 3, 64, ZSTD_btopt}, /* level 17.*/ {18, 19, 18, 9, 3, 128, ZSTD_btopt}, /* level 18.*/ {18, 19, 18, 10, 3, 256, ZSTD_btopt}, /* level 19.*/ {18, 19, 18, 11, 3, 512, ZSTD_btopt2}, /* level 20.*/ {18, 19, 18, 12, 3, 512, ZSTD_btopt2}, /* level 21.*/ {18, 19, 18, 13, 3, 512, ZSTD_btopt2}, /* level 22.*/ }, { /* for srcSize <= 128 KB */ /* W, C, H, S, L, T, strat */ {17, 12, 12, 1, 7, 8, ZSTD_fast}, /* level 0 - not used */ {17, 12, 13, 1, 6, 8, ZSTD_fast}, /* level 1 */ {17, 13, 16, 1, 5, 8, ZSTD_fast}, /* level 2 */ {17, 16, 16, 2, 5, 8, ZSTD_dfast}, /* level 3 */ {17, 13, 15, 3, 4, 8, ZSTD_greedy}, /* level 4 */ {17, 15, 17, 4, 4, 8, ZSTD_greedy}, /* level 5 */ {17, 16, 17, 3, 4, 8, ZSTD_lazy}, /* level 6 */ {17, 15, 17, 4, 4, 8, ZSTD_lazy2}, /* level 7 */ {17, 17, 17, 4, 4, 8, ZSTD_lazy2}, /* level 8 */ {17, 17, 17, 5, 4, 8, ZSTD_lazy2}, /* level 9 */ {17, 17, 17, 6, 4, 8, ZSTD_lazy2}, /* level 10 */ {17, 17, 17, 7, 4, 8, ZSTD_lazy2}, /* level 11 */ {17, 17, 17, 8, 4, 8, ZSTD_lazy2}, /* level 12 */ {17, 18, 17, 6, 4, 8, ZSTD_btlazy2}, /* level 13.*/ {17, 17, 17, 7, 3, 8, ZSTD_btopt}, /* level 14.*/ {17, 17, 17, 7, 3, 16, ZSTD_btopt}, /* level 15.*/ {17, 18, 17, 7, 3, 32, ZSTD_btopt}, /* level 16.*/ {17, 18, 17, 7, 3, 64, ZSTD_btopt}, /* level 17.*/ {17, 18, 17, 7, 3, 256, ZSTD_btopt}, /* level 18.*/ {17, 18, 17, 8, 3, 256, ZSTD_btopt}, /* level 19.*/ {17, 18, 17, 9, 3, 256, ZSTD_btopt2}, /* level 20.*/ {17, 18, 17, 10, 3, 256, ZSTD_btopt2}, /* level 21.*/ {17, 18, 17, 11, 3, 512, ZSTD_btopt2}, /* level 22.*/ }, { /* for srcSize <= 16 KB */ /* W, C, H, S, L, T, strat */ {14, 12, 12, 1, 7, 6, ZSTD_fast}, /* level 0 - not used */ {14, 14, 14, 1, 6, 6, ZSTD_fast}, /* level 1 */ {14, 14, 14, 1, 4, 6, ZSTD_fast}, /* level 2 */ {14, 14, 14, 1, 4, 6, ZSTD_dfast}, /* level 3.*/ {14, 14, 14, 4, 4, 6, ZSTD_greedy}, /* level 4.*/ {14, 14, 14, 3, 4, 6, ZSTD_lazy}, /* level 5.*/ {14, 14, 14, 4, 4, 6, ZSTD_lazy2}, /* level 6 */ {14, 14, 14, 5, 4, 6, ZSTD_lazy2}, /* level 7 */ {14, 14, 14, 6, 4, 6, ZSTD_lazy2}, /* level 8.*/ {14, 15, 14, 6, 4, 6, ZSTD_btlazy2}, /* level 9.*/ {14, 15, 14, 3, 3, 6, ZSTD_btopt}, /* level 10.*/ {14, 15, 14, 6, 3, 8, ZSTD_btopt}, /* level 11.*/ {14, 15, 14, 6, 3, 16, ZSTD_btopt}, /* level 12.*/ {14, 15, 14, 6, 3, 24, ZSTD_btopt}, /* level 13.*/ {14, 15, 15, 6, 3, 48, ZSTD_btopt}, /* level 14.*/ {14, 15, 15, 6, 3, 64, ZSTD_btopt}, /* level 15.*/ {14, 15, 15, 6, 3, 96, ZSTD_btopt}, /* level 16.*/ {14, 15, 15, 6, 3, 128, ZSTD_btopt}, /* level 17.*/ {14, 15, 15, 6, 3, 256, ZSTD_btopt}, /* level 18.*/ {14, 15, 15, 7, 3, 256, ZSTD_btopt}, /* level 19.*/ {14, 15, 15, 8, 3, 256, ZSTD_btopt2}, /* level 20.*/ {14, 15, 15, 9, 3, 256, ZSTD_btopt2}, /* level 21.*/ {14, 15, 15, 10, 3, 256, ZSTD_btopt2}, /* level 22.*/ }, }; /*! ZSTD_getCParams() : * @return ZSTD_compressionParameters structure for a selected compression level, `srcSize` and `dictSize`. * Size values are optional, provide 0 if not known or unused */
ZSTD_compressionParameters ZSTD_getCParams(int compressionLevel, unsigned long long srcSize, size_t dictSize) { ZSTD_compressionParameters cp; size_t const addedSize = srcSize ? 0 : 500; U64 const rSize = srcSize + dictSize ? srcSize + dictSize + addedSize : (U64)-1; U32 const tableID = (rSize <= 256 KB) + (rSize <= 128 KB) + (rSize <= 16 KB); /* intentional underflow for srcSizeHint == 0 */ if (compressionLevel <= 0) compressionLevel = ZSTD_DEFAULT_CLEVEL; /* 0 == default; no negative compressionLevel yet */ if (compressionLevel > ZSTD_MAX_CLEVEL) compressionLevel = ZSTD_MAX_CLEVEL; cp = ZSTD_defaultCParameters[tableID][compressionLevel]; if (ZSTD_32bits()) { /* auto-correction, for 32-bits mode */ if (cp.windowLog > ZSTD_WINDOWLOG_MAX) cp.windowLog = ZSTD_WINDOWLOG_MAX; if (cp.chainLog > ZSTD_CHAINLOG_MAX) cp.chainLog = ZSTD_CHAINLOG_MAX; if (cp.hashLog > ZSTD_HASHLOG_MAX) cp.hashLog = ZSTD_HASHLOG_MAX; } cp = ZSTD_adjustCParams(cp, srcSize, dictSize); return cp; }

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/*! ZSTD_getParams() : * same as ZSTD_getCParams(), but @return a `ZSTD_parameters` object (instead of `ZSTD_compressionParameters`). * All fields of `ZSTD_frameParameters` are set to default (0) */
ZSTD_parameters ZSTD_getParams(int compressionLevel, unsigned long long srcSize, size_t dictSize) { ZSTD_parameters params; ZSTD_compressionParameters const cParams = ZSTD_getCParams(compressionLevel, srcSize, dictSize); memset(&params, 0, sizeof(params)); params.cParams = cParams; return params; }

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EXPORT_SYMBOL(ZSTD_maxCLevel); EXPORT_SYMBOL(ZSTD_compressBound); EXPORT_SYMBOL(ZSTD_CCtxWorkspaceBound); EXPORT_SYMBOL(ZSTD_initCCtx); EXPORT_SYMBOL(ZSTD_compressCCtx); EXPORT_SYMBOL(ZSTD_compress_usingDict); EXPORT_SYMBOL(ZSTD_CDictWorkspaceBound); EXPORT_SYMBOL(ZSTD_initCDict); EXPORT_SYMBOL(ZSTD_compress_usingCDict); EXPORT_SYMBOL(ZSTD_CStreamWorkspaceBound); EXPORT_SYMBOL(ZSTD_initCStream); EXPORT_SYMBOL(ZSTD_initCStream_usingCDict); EXPORT_SYMBOL(ZSTD_resetCStream); EXPORT_SYMBOL(ZSTD_compressStream); EXPORT_SYMBOL(ZSTD_flushStream); EXPORT_SYMBOL(ZSTD_endStream); EXPORT_SYMBOL(ZSTD_CStreamInSize); EXPORT_SYMBOL(ZSTD_CStreamOutSize); EXPORT_SYMBOL(ZSTD_getCParams); EXPORT_SYMBOL(ZSTD_getParams); EXPORT_SYMBOL(ZSTD_checkCParams); EXPORT_SYMBOL(ZSTD_adjustCParams); EXPORT_SYMBOL(ZSTD_compressBegin); EXPORT_SYMBOL(ZSTD_compressBegin_usingDict); EXPORT_SYMBOL(ZSTD_compressBegin_advanced); EXPORT_SYMBOL(ZSTD_copyCCtx); EXPORT_SYMBOL(ZSTD_compressBegin_usingCDict); EXPORT_SYMBOL(ZSTD_compressContinue); EXPORT_SYMBOL(ZSTD_compressEnd); EXPORT_SYMBOL(ZSTD_getBlockSizeMax); EXPORT_SYMBOL(ZSTD_compressBlock); MODULE_LICENSE("Dual BSD/GPL"); MODULE_DESCRIPTION("Zstd Compressor");

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