mirror
/
tracy
mirror of https://github.com/wolfpld/tracy.git
Code Releases Wiki Activity
You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
master
wayland-refactor
v0.1
v0.10
v0.11.0
v0.11.1
v0.2
v0.3.3
v0.4
v0.4.1
v0.5
v0.6
v0.6.1
v0.6.2
v0.6.3
v0.7
v0.7.1
v0.7.2
v0.7.3
v0.7.4
v0.7.5
v0.7.6
v0.7.7
v0.7.8
v0.8
v0.8.1
v0.8.2
v0.8.2.1
v0.9
v0.9.1
Branches Tags
${ item.name }
Create tag ${ searchTerm }
Create branch ${ searchTerm }
from 'master'
${ noResults }
tracy/zstd/compress/zstd_compress.c

7154 lines
309 KiB
C
Raw Permalink Blame History

/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
* All rights reserved.
*
* This source code is licensed under both the BSD-style license (found in the
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
* in the COPYING file in the root directory of this source tree).
* You may select, at your option, one of the above-listed licenses.
*/
/*-*************************************
* Dependencies
***************************************/
#include "../common/allocations.h" /* ZSTD_customMalloc, ZSTD_customCalloc, ZSTD_customFree */
#include "../common/zstd_deps.h" /* INT_MAX, ZSTD_memset, ZSTD_memcpy */
#include "../common/mem.h"
#include "hist.h" /* HIST_countFast_wksp */
#define FSE_STATIC_LINKING_ONLY /* FSE_encodeSymbol */
#include "../common/fse.h"
#include "../common/huf.h"
#include "zstd_compress_internal.h"
#include "zstd_compress_sequences.h"
#include "zstd_compress_literals.h"
#include "zstd_fast.h"
#include "zstd_double_fast.h"
#include "zstd_lazy.h"
#include "zstd_opt.h"
#include "zstd_ldm.h"
#include "zstd_compress_superblock.h"
#include "../common/bits.h" /* ZSTD_highbit32, ZSTD_rotateRight_U64 */
/* ***************************************************************
* Tuning parameters
*****************************************************************/
/*!
* COMPRESS_HEAPMODE :
* Select how default decompression function ZSTD_compress() allocates its context,
* on stack (0, default), or into heap (1).
* Note that functions with explicit context such as ZSTD_compressCCtx() are unaffected.
*/
#ifndef ZSTD_COMPRESS_HEAPMODE
# define ZSTD_COMPRESS_HEAPMODE 0
#endif
/*!
* ZSTD_HASHLOG3_MAX :
* Maximum size of the hash table dedicated to find 3-bytes matches,
* in log format, aka 17 => 1 << 17 == 128Ki positions.
* This structure is only used in zstd_opt.
* Since allocation is centralized for all strategies, it has to be known here.
* The actual (selected) size of the hash table is then stored in ZSTD_matchState_t.hashLog3,
* so that zstd_opt.c doesn't need to know about this constant.
*/
#ifndef ZSTD_HASHLOG3_MAX
# define ZSTD_HASHLOG3_MAX 17
#endif
/*-*************************************
* Helper functions
***************************************/
/* ZSTD_compressBound()
* Note that the result from this function is only valid for
* the one-pass compression functions.
* When employing the streaming mode,
* if flushes are frequently altering the size of blocks,
* the overhead from block headers can make the compressed data larger
* than the return value of ZSTD_compressBound().
*/
size_t ZSTD_compressBound(size_t srcSize) {
size_t const r = ZSTD_COMPRESSBOUND(srcSize);
if (r==0) return ERROR(srcSize_wrong);
return r;
}
/*-*************************************
* Context memory management
***************************************/
struct ZSTD_CDict_s {
const void* dictContent;
size_t dictContentSize;
ZSTD_dictContentType_e dictContentType; /* The dictContentType the CDict was created with */
U32* entropyWorkspace; /* entropy workspace of HUF_WORKSPACE_SIZE bytes */
ZSTD_cwksp workspace;
ZSTD_matchState_t matchState;
ZSTD_compressedBlockState_t cBlockState;
ZSTD_customMem customMem;
U32 dictID;
int compressionLevel; /* 0 indicates that advanced API was used to select CDict params */
ZSTD_paramSwitch_e useRowMatchFinder; /* Indicates whether the CDict was created with params that would use
* row-based matchfinder. Unless the cdict is reloaded, we will use
* the same greedy/lazy matchfinder at compression time.
*/
}; /* typedef'd to ZSTD_CDict within "zstd.h" */
ZSTD_CCtx* ZSTD_createCCtx(void)
{
return ZSTD_createCCtx_advanced(ZSTD_defaultCMem);
}
static void ZSTD_initCCtx(ZSTD_CCtx* cctx, ZSTD_customMem memManager)
{
assert(cctx != NULL);
ZSTD_memset(cctx, 0, sizeof(*cctx));
cctx->customMem = memManager;
cctx->bmi2 = ZSTD_cpuSupportsBmi2();
{ size_t const err = ZSTD_CCtx_reset(cctx, ZSTD_reset_parameters);
assert(!ZSTD_isError(err));
(void)err;
}
}
ZSTD_CCtx* ZSTD_createCCtx_advanced(ZSTD_customMem customMem)
{
ZSTD_STATIC_ASSERT(zcss_init==0);
ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_UNKNOWN==(0ULL - 1));
if ((!customMem.customAlloc) ^ (!customMem.customFree)) return NULL;
{ ZSTD_CCtx* const cctx = (ZSTD_CCtx*)ZSTD_customMalloc(sizeof(ZSTD_CCtx), customMem);
if (!cctx) return NULL;
ZSTD_initCCtx(cctx, customMem);
return cctx;
}
}
ZSTD_CCtx* ZSTD_initStaticCCtx(void* workspace, size_t workspaceSize)
{
ZSTD_cwksp ws;
ZSTD_CCtx* cctx;
if (workspaceSize <= sizeof(ZSTD_CCtx)) return NULL; /* minimum size */
if ((size_t)workspace & 7) return NULL; /* must be 8-aligned */
ZSTD_cwksp_init(&ws, workspace, workspaceSize, ZSTD_cwksp_static_alloc);
cctx = (ZSTD_CCtx*)ZSTD_cwksp_reserve_object(&ws, sizeof(ZSTD_CCtx));
if (cctx == NULL) return NULL;
ZSTD_memset(cctx, 0, sizeof(ZSTD_CCtx));
ZSTD_cwksp_move(&cctx->workspace, &ws);
cctx->staticSize = workspaceSize;
/* statically sized space. entropyWorkspace never moves (but prev/next block swap places) */
if (!ZSTD_cwksp_check_available(&cctx->workspace, ENTROPY_WORKSPACE_SIZE + 2 * sizeof(ZSTD_compressedBlockState_t))) return NULL;
cctx->blockState.prevCBlock = (ZSTD_compressedBlockState_t*)ZSTD_cwksp_reserve_object(&cctx->workspace, sizeof(ZSTD_compressedBlockState_t));
cctx->blockState.nextCBlock = (ZSTD_compressedBlockState_t*)ZSTD_cwksp_reserve_object(&cctx->workspace, sizeof(ZSTD_compressedBlockState_t));
cctx->entropyWorkspace = (U32*)ZSTD_cwksp_reserve_object(&cctx->workspace, ENTROPY_WORKSPACE_SIZE);
cctx->bmi2 = ZSTD_cpuid_bmi2(ZSTD_cpuid());
return cctx;
}
/**
* Clears and frees all of the dictionaries in the CCtx.
*/
static void ZSTD_clearAllDicts(ZSTD_CCtx* cctx)
{
ZSTD_customFree(cctx->localDict.dictBuffer, cctx->customMem);
ZSTD_freeCDict(cctx->localDict.cdict);
ZSTD_memset(&cctx->localDict, 0, sizeof(cctx->localDict));
ZSTD_memset(&cctx->prefixDict, 0, sizeof(cctx->prefixDict));
cctx->cdict = NULL;
}
static size_t ZSTD_sizeof_localDict(ZSTD_localDict dict)
{
size_t const bufferSize = dict.dictBuffer != NULL ? dict.dictSize : 0;
size_t const cdictSize = ZSTD_sizeof_CDict(dict.cdict);
return bufferSize + cdictSize;
}
static void ZSTD_freeCCtxContent(ZSTD_CCtx* cctx)
{
assert(cctx != NULL);
assert(cctx->staticSize == 0);
ZSTD_clearAllDicts(cctx);
#ifdef ZSTD_MULTITHREAD
ZSTDMT_freeCCtx(cctx->mtctx); cctx->mtctx = NULL;
#endif
ZSTD_cwksp_free(&cctx->workspace, cctx->customMem);
}
size_t ZSTD_freeCCtx(ZSTD_CCtx* cctx)
{
DEBUGLOG(3, "ZSTD_freeCCtx (address: %p)", (void*)cctx);
if (cctx==NULL) return 0; /* support free on NULL */
RETURN_ERROR_IF(cctx->staticSize, memory_allocation,
"not compatible with static CCtx");
{ int cctxInWorkspace = ZSTD_cwksp_owns_buffer(&cctx->workspace, cctx);
ZSTD_freeCCtxContent(cctx);
if (!cctxInWorkspace) ZSTD_customFree(cctx, cctx->customMem);
}
return 0;
}
static size_t ZSTD_sizeof_mtctx(const ZSTD_CCtx* cctx)
{
#ifdef ZSTD_MULTITHREAD
return ZSTDMT_sizeof_CCtx(cctx->mtctx);
#else
(void)cctx;
return 0;
#endif
}
size_t ZSTD_sizeof_CCtx(const ZSTD_CCtx* cctx)
{
if (cctx==NULL) return 0; /* support sizeof on NULL */
/* cctx may be in the workspace */
return (cctx->workspace.workspace == cctx ? 0 : sizeof(*cctx))
+ ZSTD_cwksp_sizeof(&cctx->workspace)
+ ZSTD_sizeof_localDict(cctx->localDict)
+ ZSTD_sizeof_mtctx(cctx);
}
size_t ZSTD_sizeof_CStream(const ZSTD_CStream* zcs)
{
return ZSTD_sizeof_CCtx(zcs); /* same object */
}
/* private API call, for dictBuilder only */
const seqStore_t* ZSTD_getSeqStore(const ZSTD_CCtx* ctx) { return &(ctx->seqStore); }
/* Returns true if the strategy supports using a row based matchfinder */
static int ZSTD_rowMatchFinderSupported(const ZSTD_strategy strategy) {
return (strategy >= ZSTD_greedy && strategy <= ZSTD_lazy2);
}
/* Returns true if the strategy and useRowMatchFinder mode indicate that we will use the row based matchfinder
* for this compression.
*/
static int ZSTD_rowMatchFinderUsed(const ZSTD_strategy strategy, const ZSTD_paramSwitch_e mode) {
assert(mode != ZSTD_ps_auto);
return ZSTD_rowMatchFinderSupported(strategy) && (mode == ZSTD_ps_enable);
}
/* Returns row matchfinder usage given an initial mode and cParams */
static ZSTD_paramSwitch_e ZSTD_resolveRowMatchFinderMode(ZSTD_paramSwitch_e mode,
const ZSTD_compressionParameters* const cParams) {
#if defined(ZSTD_ARCH_X86_SSE2) || defined(ZSTD_ARCH_ARM_NEON)
int const kHasSIMD128 = 1;
#else
int const kHasSIMD128 = 0;
#endif
if (mode != ZSTD_ps_auto) return mode; /* if requested enabled, but no SIMD, we still will use row matchfinder */
mode = ZSTD_ps_disable;
if (!ZSTD_rowMatchFinderSupported(cParams->strategy)) return mode;
if (kHasSIMD128) {
if (cParams->windowLog > 14) mode = ZSTD_ps_enable;
} else {
if (cParams->windowLog > 17) mode = ZSTD_ps_enable;
}
return mode;
}
/* Returns block splitter usage (generally speaking, when using slower/stronger compression modes) */
static ZSTD_paramSwitch_e ZSTD_resolveBlockSplitterMode(ZSTD_paramSwitch_e mode,
const ZSTD_compressionParameters* const cParams) {
if (mode != ZSTD_ps_auto) return mode;
return (cParams->strategy >= ZSTD_btopt && cParams->windowLog >= 17) ? ZSTD_ps_enable : ZSTD_ps_disable;
}
/* Returns 1 if the arguments indicate that we should allocate a chainTable, 0 otherwise */
static int ZSTD_allocateChainTable(const ZSTD_strategy strategy,
const ZSTD_paramSwitch_e useRowMatchFinder,
const U32 forDDSDict) {
assert(useRowMatchFinder != ZSTD_ps_auto);
/* We always should allocate a chaintable if we are allocating a matchstate for a DDS dictionary matchstate.
* We do not allocate a chaintable if we are using ZSTD_fast, or are using the row-based matchfinder.
*/
return forDDSDict || ((strategy != ZSTD_fast) && !ZSTD_rowMatchFinderUsed(strategy, useRowMatchFinder));
}
/* Returns ZSTD_ps_enable if compression parameters are such that we should
* enable long distance matching (wlog >= 27, strategy >= btopt).
* Returns ZSTD_ps_disable otherwise.
*/
static ZSTD_paramSwitch_e ZSTD_resolveEnableLdm(ZSTD_paramSwitch_e mode,
const ZSTD_compressionParameters* const cParams) {
if (mode != ZSTD_ps_auto) return mode;
return (cParams->strategy >= ZSTD_btopt && cParams->windowLog >= 27) ? ZSTD_ps_enable : ZSTD_ps_disable;
}
static int ZSTD_resolveExternalSequenceValidation(int mode) {
return mode;
}
/* Resolves maxBlockSize to the default if no value is present. */
static size_t ZSTD_resolveMaxBlockSize(size_t maxBlockSize) {
if (maxBlockSize == 0) {
return ZSTD_BLOCKSIZE_MAX;
} else {
return maxBlockSize;
}
}
static ZSTD_paramSwitch_e ZSTD_resolveExternalRepcodeSearch(ZSTD_paramSwitch_e value, int cLevel) {
if (value != ZSTD_ps_auto) return value;
if (cLevel < 10) {
return ZSTD_ps_disable;
} else {
return ZSTD_ps_enable;
}
}
/* Returns 1 if compression parameters are such that CDict hashtable and chaintable indices are tagged.
* If so, the tags need to be removed in ZSTD_resetCCtx_byCopyingCDict. */
static int ZSTD_CDictIndicesAreTagged(const ZSTD_compressionParameters* const cParams) {
return cParams->strategy == ZSTD_fast || cParams->strategy == ZSTD_dfast;
}
static ZSTD_CCtx_params ZSTD_makeCCtxParamsFromCParams(
ZSTD_compressionParameters cParams)
{
ZSTD_CCtx_params cctxParams;
/* should not matter, as all cParams are presumed properly defined */
ZSTD_CCtxParams_init(&cctxParams, ZSTD_CLEVEL_DEFAULT);
cctxParams.cParams = cParams;
/* Adjust advanced params according to cParams */
cctxParams.ldmParams.enableLdm = ZSTD_resolveEnableLdm(cctxParams.ldmParams.enableLdm, &cParams);
if (cctxParams.ldmParams.enableLdm == ZSTD_ps_enable) {
ZSTD_ldm_adjustParameters(&cctxParams.ldmParams, &cParams);
assert(cctxParams.ldmParams.hashLog >= cctxParams.ldmParams.bucketSizeLog);
assert(cctxParams.ldmParams.hashRateLog < 32);
}
cctxParams.useBlockSplitter = ZSTD_resolveBlockSplitterMode(cctxParams.useBlockSplitter, &cParams);
cctxParams.useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(cctxParams.useRowMatchFinder, &cParams);
cctxParams.validateSequences = ZSTD_resolveExternalSequenceValidation(cctxParams.validateSequences);
cctxParams.maxBlockSize = ZSTD_resolveMaxBlockSize(cctxParams.maxBlockSize);
cctxParams.searchForExternalRepcodes = ZSTD_resolveExternalRepcodeSearch(cctxParams.searchForExternalRepcodes,
cctxParams.compressionLevel);
assert(!ZSTD_checkCParams(cParams));
return cctxParams;
}
static ZSTD_CCtx_params* ZSTD_createCCtxParams_advanced(
ZSTD_customMem customMem)
{
ZSTD_CCtx_params* params;
if ((!customMem.customAlloc) ^ (!customMem.customFree)) return NULL;
params = (ZSTD_CCtx_params*)ZSTD_customCalloc(
sizeof(ZSTD_CCtx_params), customMem);
if (!params) { return NULL; }
ZSTD_CCtxParams_init(params, ZSTD_CLEVEL_DEFAULT);
params->customMem = customMem;
return params;
}
ZSTD_CCtx_params* ZSTD_createCCtxParams(void)
{
return ZSTD_createCCtxParams_advanced(ZSTD_defaultCMem);
}
size_t ZSTD_freeCCtxParams(ZSTD_CCtx_params* params)
{
if (params == NULL) { return 0; }
ZSTD_customFree(params, params->customMem);
return 0;
}
size_t ZSTD_CCtxParams_reset(ZSTD_CCtx_params* params)
{
return ZSTD_CCtxParams_init(params, ZSTD_CLEVEL_DEFAULT);
}
size_t ZSTD_CCtxParams_init(ZSTD_CCtx_params* cctxParams, int compressionLevel) {
RETURN_ERROR_IF(!cctxParams, GENERIC, "NULL pointer!");
ZSTD_memset(cctxParams, 0, sizeof(*cctxParams));
cctxParams->compressionLevel = compressionLevel;
cctxParams->fParams.contentSizeFlag = 1;
return 0;
}
#define ZSTD_NO_CLEVEL 0
/**
* Initializes `cctxParams` from `params` and `compressionLevel`.
* @param compressionLevel If params are derived from a compression level then that compression level, otherwise ZSTD_NO_CLEVEL.
*/
static void
ZSTD_CCtxParams_init_internal(ZSTD_CCtx_params* cctxParams,
const ZSTD_parameters* params,
int compressionLevel)
{
assert(!ZSTD_checkCParams(params->cParams));
ZSTD_memset(cctxParams, 0, sizeof(*cctxParams));
cctxParams->cParams = params->cParams;
cctxParams->fParams = params->fParams;
/* Should not matter, as all cParams are presumed properly defined.
* But, set it for tracing anyway.
*/
cctxParams->compressionLevel = compressionLevel;
cctxParams->useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(cctxParams->useRowMatchFinder, &params->cParams);
cctxParams->useBlockSplitter = ZSTD_resolveBlockSplitterMode(cctxParams->useBlockSplitter, &params->cParams);
cctxParams->ldmParams.enableLdm = ZSTD_resolveEnableLdm(cctxParams->ldmParams.enableLdm, &params->cParams);
cctxParams->validateSequences = ZSTD_resolveExternalSequenceValidation(cctxParams->validateSequences);
cctxParams->maxBlockSize = ZSTD_resolveMaxBlockSize(cctxParams->maxBlockSize);
cctxParams->searchForExternalRepcodes = ZSTD_resolveExternalRepcodeSearch(cctxParams->searchForExternalRepcodes, compressionLevel);
DEBUGLOG(4, "ZSTD_CCtxParams_init_internal: useRowMatchFinder=%d, useBlockSplitter=%d ldm=%d",
cctxParams->useRowMatchFinder, cctxParams->useBlockSplitter, cctxParams->ldmParams.enableLdm);
}
size_t ZSTD_CCtxParams_init_advanced(ZSTD_CCtx_params* cctxParams, ZSTD_parameters params)
{
RETURN_ERROR_IF(!cctxParams, GENERIC, "NULL pointer!");
FORWARD_IF_ERROR( ZSTD_checkCParams(params.cParams) , "");
ZSTD_CCtxParams_init_internal(cctxParams, &params, ZSTD_NO_CLEVEL);
return 0;
}
/**
* Sets cctxParams' cParams and fParams from params, but otherwise leaves them alone.
* @param params Validated zstd parameters.
*/
static void ZSTD_CCtxParams_setZstdParams(
ZSTD_CCtx_params* cctxParams, const ZSTD_parameters* params)
{
assert(!ZSTD_checkCParams(params->cParams));
cctxParams->cParams = params->cParams;
cctxParams->fParams = params->fParams;
/* Should not matter, as all cParams are presumed properly defined.
* But, set it for tracing anyway.
*/
cctxParams->compressionLevel = ZSTD_NO_CLEVEL;
}
ZSTD_bounds ZSTD_cParam_getBounds(ZSTD_cParameter param)
{
ZSTD_bounds bounds = { 0, 0, 0 };
switch(param)
{
case ZSTD_c_compressionLevel:
bounds.lowerBound = ZSTD_minCLevel();
bounds.upperBound = ZSTD_maxCLevel();
return bounds;
case ZSTD_c_windowLog:
bounds.lowerBound = ZSTD_WINDOWLOG_MIN;
bounds.upperBound = ZSTD_WINDOWLOG_MAX;
return bounds;
case ZSTD_c_hashLog:
bounds.lowerBound = ZSTD_HASHLOG_MIN;
bounds.upperBound = ZSTD_HASHLOG_MAX;
return bounds;
case ZSTD_c_chainLog:
bounds.lowerBound = ZSTD_CHAINLOG_MIN;
bounds.upperBound = ZSTD_CHAINLOG_MAX;
return bounds;
case ZSTD_c_searchLog:
bounds.lowerBound = ZSTD_SEARCHLOG_MIN;
bounds.upperBound = ZSTD_SEARCHLOG_MAX;
return bounds;
case ZSTD_c_minMatch:
bounds.lowerBound = ZSTD_MINMATCH_MIN;
bounds.upperBound = ZSTD_MINMATCH_MAX;
return bounds;
case ZSTD_c_targetLength:
bounds.lowerBound = ZSTD_TARGETLENGTH_MIN;
bounds.upperBound = ZSTD_TARGETLENGTH_MAX;
return bounds;
case ZSTD_c_strategy:
bounds.lowerBound = ZSTD_STRATEGY_MIN;
bounds.upperBound = ZSTD_STRATEGY_MAX;
return bounds;
case ZSTD_c_contentSizeFlag:
bounds.lowerBound = 0;
bounds.upperBound = 1;
return bounds;
case ZSTD_c_checksumFlag:
bounds.lowerBound = 0;
bounds.upperBound = 1;
return bounds;
case ZSTD_c_dictIDFlag:
bounds.lowerBound = 0;
bounds.upperBound = 1;
return bounds;
case ZSTD_c_nbWorkers:
bounds.lowerBound = 0;
#ifdef ZSTD_MULTITHREAD
bounds.upperBound = ZSTDMT_NBWORKERS_MAX;
#else
bounds.upperBound = 0;
#endif
return bounds;
case ZSTD_c_jobSize:
bounds.lowerBound = 0;
#ifdef ZSTD_MULTITHREAD
bounds.upperBound = ZSTDMT_JOBSIZE_MAX;
#else
bounds.upperBound = 0;
#endif
return bounds;
case ZSTD_c_overlapLog:
#ifdef ZSTD_MULTITHREAD
bounds.lowerBound = ZSTD_OVERLAPLOG_MIN;
bounds.upperBound = ZSTD_OVERLAPLOG_MAX;
#else
bounds.lowerBound = 0;
bounds.upperBound = 0;
#endif
return bounds;
case ZSTD_c_enableDedicatedDictSearch:
bounds.lowerBound = 0;
bounds.upperBound = 1;
return bounds;
case ZSTD_c_enableLongDistanceMatching:
bounds.lowerBound = (int)ZSTD_ps_auto;
bounds.upperBound = (int)ZSTD_ps_disable;
return bounds;
case ZSTD_c_ldmHashLog:
bounds.lowerBound = ZSTD_LDM_HASHLOG_MIN;
bounds.upperBound = ZSTD_LDM_HASHLOG_MAX;
return bounds;
case ZSTD_c_ldmMinMatch:
bounds.lowerBound = ZSTD_LDM_MINMATCH_MIN;
bounds.upperBound = ZSTD_LDM_MINMATCH_MAX;
return bounds;
case ZSTD_c_ldmBucketSizeLog:
bounds.lowerBound = ZSTD_LDM_BUCKETSIZELOG_MIN;
bounds.upperBound = ZSTD_LDM_BUCKETSIZELOG_MAX;
return bounds;
case ZSTD_c_ldmHashRateLog:
bounds.lowerBound = ZSTD_LDM_HASHRATELOG_MIN;
bounds.upperBound = ZSTD_LDM_HASHRATELOG_MAX;
return bounds;
/* experimental parameters */
case ZSTD_c_rsyncable:
bounds.lowerBound = 0;
bounds.upperBound = 1;
return bounds;
case ZSTD_c_forceMaxWindow :
bounds.lowerBound = 0;
bounds.upperBound = 1;
return bounds;
case ZSTD_c_format:
ZSTD_STATIC_ASSERT(ZSTD_f_zstd1 < ZSTD_f_zstd1_magicless);
bounds.lowerBound = ZSTD_f_zstd1;
bounds.upperBound = ZSTD_f_zstd1_magicless; /* note : how to ensure at compile time that this is the highest value enum ? */
return bounds;
case ZSTD_c_forceAttachDict:
ZSTD_STATIC_ASSERT(ZSTD_dictDefaultAttach < ZSTD_dictForceLoad);
bounds.lowerBound = ZSTD_dictDefaultAttach;
bounds.upperBound = ZSTD_dictForceLoad; /* note : how to ensure at compile time that this is the highest value enum ? */
return bounds;
case ZSTD_c_literalCompressionMode:
ZSTD_STATIC_ASSERT(ZSTD_ps_auto < ZSTD_ps_enable && ZSTD_ps_enable < ZSTD_ps_disable);
bounds.lowerBound = (int)ZSTD_ps_auto;
bounds.upperBound = (int)ZSTD_ps_disable;
return bounds;
case ZSTD_c_targetCBlockSize:
bounds.lowerBound = ZSTD_TARGETCBLOCKSIZE_MIN;
bounds.upperBound = ZSTD_TARGETCBLOCKSIZE_MAX;
return bounds;
case ZSTD_c_srcSizeHint:
bounds.lowerBound = ZSTD_SRCSIZEHINT_MIN;
bounds.upperBound = ZSTD_SRCSIZEHINT_MAX;
return bounds;
case ZSTD_c_stableInBuffer:
case ZSTD_c_stableOutBuffer:
bounds.lowerBound = (int)ZSTD_bm_buffered;
bounds.upperBound = (int)ZSTD_bm_stable;
return bounds;
case ZSTD_c_blockDelimiters:
bounds.lowerBound = (int)ZSTD_sf_noBlockDelimiters;
bounds.upperBound = (int)ZSTD_sf_explicitBlockDelimiters;
return bounds;
case ZSTD_c_validateSequences:
bounds.lowerBound = 0;
bounds.upperBound = 1;
return bounds;
case ZSTD_c_useBlockSplitter:
bounds.lowerBound = (int)ZSTD_ps_auto;
bounds.upperBound = (int)ZSTD_ps_disable;
return bounds;
case ZSTD_c_useRowMatchFinder:
bounds.lowerBound = (int)ZSTD_ps_auto;
bounds.upperBound = (int)ZSTD_ps_disable;
return bounds;
case ZSTD_c_deterministicRefPrefix:
bounds.lowerBound = 0;
bounds.upperBound = 1;
return bounds;
case ZSTD_c_prefetchCDictTables:
bounds.lowerBound = (int)ZSTD_ps_auto;
bounds.upperBound = (int)ZSTD_ps_disable;
return bounds;
case ZSTD_c_enableSeqProducerFallback:
bounds.lowerBound = 0;
bounds.upperBound = 1;
return bounds;
case ZSTD_c_maxBlockSize:
bounds.lowerBound = ZSTD_BLOCKSIZE_MAX_MIN;
bounds.upperBound = ZSTD_BLOCKSIZE_MAX;
return bounds;
case ZSTD_c_searchForExternalRepcodes:
bounds.lowerBound = (int)ZSTD_ps_auto;
bounds.upperBound = (int)ZSTD_ps_disable;
return bounds;
default:
bounds.error = ERROR(parameter_unsupported);
return bounds;
}
}
/* ZSTD_cParam_clampBounds:
* Clamps the value into the bounded range.
*/
static size_t ZSTD_cParam_clampBounds(ZSTD_cParameter cParam, int* value)
{
ZSTD_bounds const bounds = ZSTD_cParam_getBounds(cParam);
if (ZSTD_isError(bounds.error)) return bounds.error;
if (*value < bounds.lowerBound) *value = bounds.lowerBound;
if (*value > bounds.upperBound) *value = bounds.upperBound;
return 0;
}
#define BOUNDCHECK(cParam, val) \
do { \
RETURN_ERROR_IF(!ZSTD_cParam_withinBounds(cParam,val), \
parameter_outOfBound, "Param out of bounds"); \
} while (0)
static int ZSTD_isUpdateAuthorized(ZSTD_cParameter param)
{
switch(param)
{
case ZSTD_c_compressionLevel:
case ZSTD_c_hashLog:
case ZSTD_c_chainLog:
case ZSTD_c_searchLog:
case ZSTD_c_minMatch:
case ZSTD_c_targetLength:
case ZSTD_c_strategy:
return 1;
case ZSTD_c_format:
case ZSTD_c_windowLog:
case ZSTD_c_contentSizeFlag:
case ZSTD_c_checksumFlag:
case ZSTD_c_dictIDFlag:
case ZSTD_c_forceMaxWindow :
case ZSTD_c_nbWorkers:
case ZSTD_c_jobSize:
case ZSTD_c_overlapLog:
case ZSTD_c_rsyncable:
case ZSTD_c_enableDedicatedDictSearch:
case ZSTD_c_enableLongDistanceMatching:
case ZSTD_c_ldmHashLog:
case ZSTD_c_ldmMinMatch:
case ZSTD_c_ldmBucketSizeLog:
case ZSTD_c_ldmHashRateLog:
case ZSTD_c_forceAttachDict:
case ZSTD_c_literalCompressionMode:
case ZSTD_c_targetCBlockSize:
case ZSTD_c_srcSizeHint:
case ZSTD_c_stableInBuffer:
case ZSTD_c_stableOutBuffer:
case ZSTD_c_blockDelimiters:
case ZSTD_c_validateSequences:
case ZSTD_c_useBlockSplitter:
case ZSTD_c_useRowMatchFinder:
case ZSTD_c_deterministicRefPrefix:
case ZSTD_c_prefetchCDictTables:
case ZSTD_c_enableSeqProducerFallback:
case ZSTD_c_maxBlockSize:
case ZSTD_c_searchForExternalRepcodes:
default:
return 0;
}
}
size_t ZSTD_CCtx_setParameter(ZSTD_CCtx* cctx, ZSTD_cParameter param, int value)
{
DEBUGLOG(4, "ZSTD_CCtx_setParameter (%i, %i)", (int)param, value);
if (cctx->streamStage != zcss_init) {
if (ZSTD_isUpdateAuthorized(param)) {
cctx->cParamsChanged = 1;
} else {
RETURN_ERROR(stage_wrong, "can only set params in cctx init stage");
} }
switch(param)
{
case ZSTD_c_nbWorkers:
RETURN_ERROR_IF((value!=0) && cctx->staticSize, parameter_unsupported,
"MT not compatible with static alloc");
break;
case ZSTD_c_compressionLevel:
case ZSTD_c_windowLog:
case ZSTD_c_hashLog:
case ZSTD_c_chainLog:
case ZSTD_c_searchLog:
case ZSTD_c_minMatch:
case ZSTD_c_targetLength:
case ZSTD_c_strategy:
case ZSTD_c_ldmHashRateLog:
case ZSTD_c_format:
case ZSTD_c_contentSizeFlag:
case ZSTD_c_checksumFlag:
case ZSTD_c_dictIDFlag:
case ZSTD_c_forceMaxWindow:
case ZSTD_c_forceAttachDict:
case ZSTD_c_literalCompressionMode:
case ZSTD_c_jobSize:
case ZSTD_c_overlapLog:
case ZSTD_c_rsyncable:
case ZSTD_c_enableDedicatedDictSearch:
case ZSTD_c_enableLongDistanceMatching:
case ZSTD_c_ldmHashLog:
case ZSTD_c_ldmMinMatch:
case ZSTD_c_ldmBucketSizeLog:
case ZSTD_c_targetCBlockSize:
case ZSTD_c_srcSizeHint:
case ZSTD_c_stableInBuffer:
case ZSTD_c_stableOutBuffer:
case ZSTD_c_blockDelimiters:
case ZSTD_c_validateSequences:
case ZSTD_c_useBlockSplitter:
case ZSTD_c_useRowMatchFinder:
case ZSTD_c_deterministicRefPrefix:
case ZSTD_c_prefetchCDictTables:
case ZSTD_c_enableSeqProducerFallback:
case ZSTD_c_maxBlockSize:
case ZSTD_c_searchForExternalRepcodes:
break;
default: RETURN_ERROR(parameter_unsupported, "unknown parameter");
}
return ZSTD_CCtxParams_setParameter(&cctx->requestedParams, param, value);
}
size_t ZSTD_CCtxParams_setParameter(ZSTD_CCtx_params* CCtxParams,
ZSTD_cParameter param, int value)
{
DEBUGLOG(4, "ZSTD_CCtxParams_setParameter (%i, %i)", (int)param, value);
switch(param)
{
case ZSTD_c_format :
BOUNDCHECK(ZSTD_c_format, value);
CCtxParams->format = (ZSTD_format_e)value;
return (size_t)CCtxParams->format;
case ZSTD_c_compressionLevel : {
FORWARD_IF_ERROR(ZSTD_cParam_clampBounds(param, &value), "");
if (value == 0)
CCtxParams->compressionLevel = ZSTD_CLEVEL_DEFAULT; /* 0 == default */
else
CCtxParams->compressionLevel = value;
if (CCtxParams->compressionLevel >= 0) return (size_t)CCtxParams->compressionLevel;
return 0; /* return type (size_t) cannot represent negative values */
}
case ZSTD_c_windowLog :
if (value!=0) /* 0 => use default */
BOUNDCHECK(ZSTD_c_windowLog, value);
CCtxParams->cParams.windowLog = (U32)value;
return CCtxParams->cParams.windowLog;
case ZSTD_c_hashLog :
if (value!=0) /* 0 => use default */
BOUNDCHECK(ZSTD_c_hashLog, value);
CCtxParams->cParams.hashLog = (U32)value;
return CCtxParams->cParams.hashLog;
case ZSTD_c_chainLog :
if (value!=0) /* 0 => use default */
BOUNDCHECK(ZSTD_c_chainLog, value);
CCtxParams->cParams.chainLog = (U32)value;
return CCtxParams->cParams.chainLog;
case ZSTD_c_searchLog :
if (value!=0) /* 0 => use default */
BOUNDCHECK(ZSTD_c_searchLog, value);
CCtxParams->cParams.searchLog = (U32)value;
return (size_t)value;
case ZSTD_c_minMatch :
if (value!=0) /* 0 => use default */
BOUNDCHECK(ZSTD_c_minMatch, value);
CCtxParams->cParams.minMatch = (U32)value;
return CCtxParams->cParams.minMatch;
case ZSTD_c_targetLength :
BOUNDCHECK(ZSTD_c_targetLength, value);
CCtxParams->cParams.targetLength = (U32)value;
return CCtxParams->cParams.targetLength;
case ZSTD_c_strategy :
if (value!=0) /* 0 => use default */
BOUNDCHECK(ZSTD_c_strategy, value);
CCtxParams->cParams.strategy = (ZSTD_strategy)value;
return (size_t)CCtxParams->cParams.strategy;
case ZSTD_c_contentSizeFlag :
/* Content size written in frame header _when known_ (default:1) */
DEBUGLOG(4, "set content size flag = %u", (value!=0));
CCtxParams->fParams.contentSizeFlag = value != 0;
return (size_t)CCtxParams->fParams.contentSizeFlag;
case ZSTD_c_checksumFlag :
/* A 32-bits content checksum will be calculated and written at end of frame (default:0) */
CCtxParams->fParams.checksumFlag = value != 0;
return (size_t)CCtxParams->fParams.checksumFlag;
case ZSTD_c_dictIDFlag : /* When applicable, dictionary's dictID is provided in frame header (default:1) */
DEBUGLOG(4, "set dictIDFlag = %u", (value!=0));
CCtxParams->fParams.noDictIDFlag = !value;
return !CCtxParams->fParams.noDictIDFlag;
case ZSTD_c_forceMaxWindow :
CCtxParams->forceWindow = (value != 0);
return (size_t)CCtxParams->forceWindow;
case ZSTD_c_forceAttachDict : {
const ZSTD_dictAttachPref_e pref = (ZSTD_dictAttachPref_e)value;
BOUNDCHECK(ZSTD_c_forceAttachDict, (int)pref);
CCtxParams->attachDictPref = pref;
return CCtxParams->attachDictPref;
}
case ZSTD_c_literalCompressionMode : {
const ZSTD_paramSwitch_e lcm = (ZSTD_paramSwitch_e)value;
BOUNDCHECK(ZSTD_c_literalCompressionMode, (int)lcm);
CCtxParams->literalCompressionMode = lcm;
return CCtxParams->literalCompressionMode;
}
case ZSTD_c_nbWorkers :
#ifndef ZSTD_MULTITHREAD
RETURN_ERROR_IF(value!=0, parameter_unsupported, "not compiled with multithreading");
return 0;
#else
FORWARD_IF_ERROR(ZSTD_cParam_clampBounds(param, &value), "");
CCtxParams->nbWorkers = value;
return (size_t)(CCtxParams->nbWorkers);
#endif
case ZSTD_c_jobSize :
#ifndef ZSTD_MULTITHREAD
RETURN_ERROR_IF(value!=0, parameter_unsupported, "not compiled with multithreading");
return 0;
#else
/* Adjust to the minimum non-default value. */
if (value != 0 && value < ZSTDMT_JOBSIZE_MIN)
value = ZSTDMT_JOBSIZE_MIN;
FORWARD_IF_ERROR(ZSTD_cParam_clampBounds(param, &value), "");
assert(value >= 0);
CCtxParams->jobSize = value;
return CCtxParams->jobSize;
#endif
case ZSTD_c_overlapLog :
#ifndef ZSTD_MULTITHREAD
RETURN_ERROR_IF(value!=0, parameter_unsupported, "not compiled with multithreading");
return 0;
#else
FORWARD_IF_ERROR(ZSTD_cParam_clampBounds(ZSTD_c_overlapLog, &value), "");
CCtxParams->overlapLog = value;
return (size_t)CCtxParams->overlapLog;
#endif
case ZSTD_c_rsyncable :
#ifndef ZSTD_MULTITHREAD
RETURN_ERROR_IF(value!=0, parameter_unsupported, "not compiled with multithreading");
return 0;
#else
FORWARD_IF_ERROR(ZSTD_cParam_clampBounds(ZSTD_c_overlapLog, &value), "");
CCtxParams->rsyncable = value;
return (size_t)CCtxParams->rsyncable;
#endif
case ZSTD_c_enableDedicatedDictSearch :
CCtxParams->enableDedicatedDictSearch = (value!=0);
return (size_t)CCtxParams->enableDedicatedDictSearch;
case ZSTD_c_enableLongDistanceMatching :
BOUNDCHECK(ZSTD_c_enableLongDistanceMatching, value);
CCtxParams->ldmParams.enableLdm = (ZSTD_paramSwitch_e)value;
return CCtxParams->ldmParams.enableLdm;
case ZSTD_c_ldmHashLog :
if (value!=0) /* 0 ==> auto */
BOUNDCHECK(ZSTD_c_ldmHashLog, value);
CCtxParams->ldmParams.hashLog = (U32)value;
return CCtxParams->ldmParams.hashLog;
case ZSTD_c_ldmMinMatch :
if (value!=0) /* 0 ==> default */
BOUNDCHECK(ZSTD_c_ldmMinMatch, value);
CCtxParams->ldmParams.minMatchLength = (U32)value;
return CCtxParams->ldmParams.minMatchLength;
case ZSTD_c_ldmBucketSizeLog :
if (value!=0) /* 0 ==> default */
BOUNDCHECK(ZSTD_c_ldmBucketSizeLog, value);
CCtxParams->ldmParams.bucketSizeLog = (U32)value;
return CCtxParams->ldmParams.bucketSizeLog;
case ZSTD_c_ldmHashRateLog :
if (value!=0) /* 0 ==> default */
BOUNDCHECK(ZSTD_c_ldmHashRateLog, value);
CCtxParams->ldmParams.hashRateLog = (U32)value;
return CCtxParams->ldmParams.hashRateLog;
case ZSTD_c_targetCBlockSize :
if (value!=0) { /* 0 ==> default */
value = MAX(value, ZSTD_TARGETCBLOCKSIZE_MIN);
BOUNDCHECK(ZSTD_c_targetCBlockSize, value);
}
CCtxParams->targetCBlockSize = (U32)value;
return CCtxParams->targetCBlockSize;
case ZSTD_c_srcSizeHint :
if (value!=0) /* 0 ==> default */
BOUNDCHECK(ZSTD_c_srcSizeHint, value);
CCtxParams->srcSizeHint = value;
return (size_t)CCtxParams->srcSizeHint;
case ZSTD_c_stableInBuffer:
BOUNDCHECK(ZSTD_c_stableInBuffer, value);
CCtxParams->inBufferMode = (ZSTD_bufferMode_e)value;
return CCtxParams->inBufferMode;
case ZSTD_c_stableOutBuffer:
BOUNDCHECK(ZSTD_c_stableOutBuffer, value);
CCtxParams->outBufferMode = (ZSTD_bufferMode_e)value;
return CCtxParams->outBufferMode;
case ZSTD_c_blockDelimiters:
BOUNDCHECK(ZSTD_c_blockDelimiters, value);
CCtxParams->blockDelimiters = (ZSTD_sequenceFormat_e)value;
return CCtxParams->blockDelimiters;
case ZSTD_c_validateSequences:
BOUNDCHECK(ZSTD_c_validateSequences, value);
CCtxParams->validateSequences = value;
return (size_t)CCtxParams->validateSequences;
case ZSTD_c_useBlockSplitter:
BOUNDCHECK(ZSTD_c_useBlockSplitter, value);
CCtxParams->useBlockSplitter = (ZSTD_paramSwitch_e)value;
return CCtxParams->useBlockSplitter;
case ZSTD_c_useRowMatchFinder:
BOUNDCHECK(ZSTD_c_useRowMatchFinder, value);
CCtxParams->useRowMatchFinder = (ZSTD_paramSwitch_e)value;
return CCtxParams->useRowMatchFinder;
case ZSTD_c_deterministicRefPrefix:
BOUNDCHECK(ZSTD_c_deterministicRefPrefix, value);
CCtxParams->deterministicRefPrefix = !!value;
return (size_t)CCtxParams->deterministicRefPrefix;
case ZSTD_c_prefetchCDictTables:
BOUNDCHECK(ZSTD_c_prefetchCDictTables, value);
CCtxParams->prefetchCDictTables = (ZSTD_paramSwitch_e)value;
return CCtxParams->prefetchCDictTables;
case ZSTD_c_enableSeqProducerFallback:
BOUNDCHECK(ZSTD_c_enableSeqProducerFallback, value);
CCtxParams->enableMatchFinderFallback = value;
return (size_t)CCtxParams->enableMatchFinderFallback;
case ZSTD_c_maxBlockSize:
if (value!=0) /* 0 ==> default */
BOUNDCHECK(ZSTD_c_maxBlockSize, value);
CCtxParams->maxBlockSize = value;
return CCtxParams->maxBlockSize;
case ZSTD_c_searchForExternalRepcodes:
BOUNDCHECK(ZSTD_c_searchForExternalRepcodes, value);
CCtxParams->searchForExternalRepcodes = (ZSTD_paramSwitch_e)value;
return CCtxParams->searchForExternalRepcodes;
default: RETURN_ERROR(parameter_unsupported, "unknown parameter");
}
}
size_t ZSTD_CCtx_getParameter(ZSTD_CCtx const* cctx, ZSTD_cParameter param, int* value)
{
return ZSTD_CCtxParams_getParameter(&cctx->requestedParams, param, value);
}
size_t ZSTD_CCtxParams_getParameter(
ZSTD_CCtx_params const* CCtxParams, ZSTD_cParameter param, int* value)
{
switch(param)
{
case ZSTD_c_format :
*value = CCtxParams->format;
break;
case ZSTD_c_compressionLevel :
*value = CCtxParams->compressionLevel;
break;
case ZSTD_c_windowLog :
*value = (int)CCtxParams->cParams.windowLog;
break;
case ZSTD_c_hashLog :
*value = (int)CCtxParams->cParams.hashLog;
break;
case ZSTD_c_chainLog :
*value = (int)CCtxParams->cParams.chainLog;
break;
case ZSTD_c_searchLog :
*value = CCtxParams->cParams.searchLog;
break;
case ZSTD_c_minMatch :
*value = CCtxParams->cParams.minMatch;
break;
case ZSTD_c_targetLength :
*value = CCtxParams->cParams.targetLength;
break;
case ZSTD_c_strategy :
*value = (unsigned)CCtxParams->cParams.strategy;
break;
case ZSTD_c_contentSizeFlag :
*value = CCtxParams->fParams.contentSizeFlag;
break;
case ZSTD_c_checksumFlag :
*value = CCtxParams->fParams.checksumFlag;
break;
case ZSTD_c_dictIDFlag :
*value = !CCtxParams->fParams.noDictIDFlag;
break;
case ZSTD_c_forceMaxWindow :
*value = CCtxParams->forceWindow;
break;
case ZSTD_c_forceAttachDict :
*value = CCtxParams->attachDictPref;
break;
case ZSTD_c_literalCompressionMode :
*value = CCtxParams->literalCompressionMode;
break;
case ZSTD_c_nbWorkers :
#ifndef ZSTD_MULTITHREAD
assert(CCtxParams->nbWorkers == 0);
#endif
*value = CCtxParams->nbWorkers;
break;
case ZSTD_c_jobSize :
#ifndef ZSTD_MULTITHREAD
RETURN_ERROR(parameter_unsupported, "not compiled with multithreading");
#else
assert(CCtxParams->jobSize <= INT_MAX);
*value = (int)CCtxParams->jobSize;
break;
#endif
case ZSTD_c_overlapLog :
#ifndef ZSTD_MULTITHREAD
RETURN_ERROR(parameter_unsupported, "not compiled with multithreading");
#else
*value = CCtxParams->overlapLog;
break;
#endif
case ZSTD_c_rsyncable :
#ifndef ZSTD_MULTITHREAD
RETURN_ERROR(parameter_unsupported, "not compiled with multithreading");
#else
*value = CCtxParams->rsyncable;
break;
#endif
case ZSTD_c_enableDedicatedDictSearch :
*value = CCtxParams->enableDedicatedDictSearch;
break;
case ZSTD_c_enableLongDistanceMatching :
*value = CCtxParams->ldmParams.enableLdm;
break;
case ZSTD_c_ldmHashLog :
*value = CCtxParams->ldmParams.hashLog;
break;
case ZSTD_c_ldmMinMatch :
*value = CCtxParams->ldmParams.minMatchLength;
break;
case ZSTD_c_ldmBucketSizeLog :
*value = CCtxParams->ldmParams.bucketSizeLog;
break;
case ZSTD_c_ldmHashRateLog :
*value = CCtxParams->ldmParams.hashRateLog;
break;
case ZSTD_c_targetCBlockSize :
*value = (int)CCtxParams->targetCBlockSize;
break;
case ZSTD_c_srcSizeHint :
*value = (int)CCtxParams->srcSizeHint;
break;
case ZSTD_c_stableInBuffer :
*value = (int)CCtxParams->inBufferMode;
break;
case ZSTD_c_stableOutBuffer :
*value = (int)CCtxParams->outBufferMode;
break;
case ZSTD_c_blockDelimiters :
*value = (int)CCtxParams->blockDelimiters;
break;
case ZSTD_c_validateSequences :
*value = (int)CCtxParams->validateSequences;
break;
case ZSTD_c_useBlockSplitter :
*value = (int)CCtxParams->useBlockSplitter;
break;
case ZSTD_c_useRowMatchFinder :
*value = (int)CCtxParams->useRowMatchFinder;
break;
case ZSTD_c_deterministicRefPrefix:
*value = (int)CCtxParams->deterministicRefPrefix;
break;
case ZSTD_c_prefetchCDictTables:
*value = (int)CCtxParams->prefetchCDictTables;
break;
case ZSTD_c_enableSeqProducerFallback:
*value = CCtxParams->enableMatchFinderFallback;
break;
case ZSTD_c_maxBlockSize:
*value = (int)CCtxParams->maxBlockSize;
break;
case ZSTD_c_searchForExternalRepcodes:
*value = (int)CCtxParams->searchForExternalRepcodes;
break;
default: RETURN_ERROR(parameter_unsupported, "unknown parameter");
}
return 0;
}
/** ZSTD_CCtx_setParametersUsingCCtxParams() :
* just applies `params` into `cctx`
* no action is performed, parameters are merely stored.
* If ZSTDMT is enabled, parameters are pushed to cctx->mtctx.
* This is possible even if a compression is ongoing.
* In which case, new parameters will be applied on the fly, starting with next compression job.
*/
size_t ZSTD_CCtx_setParametersUsingCCtxParams(
ZSTD_CCtx* cctx, const ZSTD_CCtx_params* params)
{
DEBUGLOG(4, "ZSTD_CCtx_setParametersUsingCCtxParams");
RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
"The context is in the wrong stage!");
RETURN_ERROR_IF(cctx->cdict, stage_wrong,
"Can't override parameters with cdict attached (some must "
"be inherited from the cdict).");
cctx->requestedParams = *params;
return 0;
}
size_t ZSTD_CCtx_setCParams(ZSTD_CCtx* cctx, ZSTD_compressionParameters cparams)
{
ZSTD_STATIC_ASSERT(sizeof(cparams) == 7 * 4 /* all params are listed below */);
DEBUGLOG(4, "ZSTD_CCtx_setCParams");
/* only update if all parameters are valid */
FORWARD_IF_ERROR(ZSTD_checkCParams(cparams), "");
FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(cctx, ZSTD_c_windowLog, cparams.windowLog), "");
FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(cctx, ZSTD_c_chainLog, cparams.chainLog), "");
FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(cctx, ZSTD_c_hashLog, cparams.hashLog), "");
FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(cctx, ZSTD_c_searchLog, cparams.searchLog), "");
FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(cctx, ZSTD_c_minMatch, cparams.minMatch), "");
FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(cctx, ZSTD_c_targetLength, cparams.targetLength), "");
FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(cctx, ZSTD_c_strategy, cparams.strategy), "");
return 0;
}
size_t ZSTD_CCtx_setFParams(ZSTD_CCtx* cctx, ZSTD_frameParameters fparams)
{
ZSTD_STATIC_ASSERT(sizeof(fparams) == 3 * 4 /* all params are listed below */);
DEBUGLOG(4, "ZSTD_CCtx_setFParams");
FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(cctx, ZSTD_c_contentSizeFlag, fparams.contentSizeFlag != 0), "");
FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(cctx, ZSTD_c_checksumFlag, fparams.checksumFlag != 0), "");
FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(cctx, ZSTD_c_dictIDFlag, fparams.noDictIDFlag == 0), "");
return 0;
}
size_t ZSTD_CCtx_setParams(ZSTD_CCtx* cctx, ZSTD_parameters params)
{
DEBUGLOG(4, "ZSTD_CCtx_setParams");
/* First check cParams, because we want to update all or none. */
FORWARD_IF_ERROR(ZSTD_checkCParams(params.cParams), "");
/* Next set fParams, because this could fail if the cctx isn't in init stage. */
FORWARD_IF_ERROR(ZSTD_CCtx_setFParams(cctx, params.fParams), "");
/* Finally set cParams, which should succeed. */
FORWARD_IF_ERROR(ZSTD_CCtx_setCParams(cctx, params.cParams), "");
return 0;
}
size_t ZSTD_CCtx_setPledgedSrcSize(ZSTD_CCtx* cctx, unsigned long long pledgedSrcSize)
{
DEBUGLOG(4, "ZSTD_CCtx_setPledgedSrcSize to %llu bytes", pledgedSrcSize);
RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
"Can't set pledgedSrcSize when not in init stage.");
cctx->pledgedSrcSizePlusOne = pledgedSrcSize+1;
return 0;
}
static ZSTD_compressionParameters ZSTD_dedicatedDictSearch_getCParams(
int const compressionLevel,
size_t const dictSize);
static int ZSTD_dedicatedDictSearch_isSupported(
const ZSTD_compressionParameters* cParams);
static void ZSTD_dedicatedDictSearch_revertCParams(
ZSTD_compressionParameters* cParams);
/**
* Initializes the local dictionary using requested parameters.
* NOTE: Initialization does not employ the pledged src size,
* because the dictionary may be used for multiple compressions.
*/
static size_t ZSTD_initLocalDict(ZSTD_CCtx* cctx)
{
ZSTD_localDict* const dl = &cctx->localDict;
if (dl->dict == NULL) {
/* No local dictionary. */
assert(dl->dictBuffer == NULL);
assert(dl->cdict == NULL);
assert(dl->dictSize == 0);
return 0;
}
if (dl->cdict != NULL) {
/* Local dictionary already initialized. */
assert(cctx->cdict == dl->cdict);
return 0;
}
assert(dl->dictSize > 0);
assert(cctx->cdict == NULL);
assert(cctx->prefixDict.dict == NULL);
dl->cdict = ZSTD_createCDict_advanced2(
dl->dict,
dl->dictSize,
ZSTD_dlm_byRef,
dl->dictContentType,
&cctx->requestedParams,
cctx->customMem);
RETURN_ERROR_IF(!dl->cdict, memory_allocation, "ZSTD_createCDict_advanced failed");
cctx->cdict = dl->cdict;
return 0;
}
size_t ZSTD_CCtx_loadDictionary_advanced(
ZSTD_CCtx* cctx,
const void* dict, size_t dictSize,
ZSTD_dictLoadMethod_e dictLoadMethod,
ZSTD_dictContentType_e dictContentType)
{
DEBUGLOG(4, "ZSTD_CCtx_loadDictionary_advanced (size: %u)", (U32)dictSize);
RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
"Can't load a dictionary when cctx is not in init stage.");
ZSTD_clearAllDicts(cctx); /* erase any previously set dictionary */
if (dict == NULL || dictSize == 0) /* no dictionary */
return 0;
if (dictLoadMethod == ZSTD_dlm_byRef) {
cctx->localDict.dict = dict;
} else {
/* copy dictionary content inside CCtx to own its lifetime */
void* dictBuffer;
RETURN_ERROR_IF(cctx->staticSize, memory_allocation,
"static CCtx can't allocate for an internal copy of dictionary");
dictBuffer = ZSTD_customMalloc(dictSize, cctx->customMem);
RETURN_ERROR_IF(dictBuffer==NULL, memory_allocation,
"allocation failed for dictionary content");
ZSTD_memcpy(dictBuffer, dict, dictSize);
cctx->localDict.dictBuffer = dictBuffer; /* owned ptr to free */
cctx->localDict.dict = dictBuffer; /* read-only reference */
}
cctx->localDict.dictSize = dictSize;
cctx->localDict.dictContentType = dictContentType;
return 0;
}
size_t ZSTD_CCtx_loadDictionary_byReference(
ZSTD_CCtx* cctx, const void* dict, size_t dictSize)
{
return ZSTD_CCtx_loadDictionary_advanced(
cctx, dict, dictSize, ZSTD_dlm_byRef, ZSTD_dct_auto);
}
size_t ZSTD_CCtx_loadDictionary(ZSTD_CCtx* cctx, const void* dict, size_t dictSize)
{
return ZSTD_CCtx_loadDictionary_advanced(
cctx, dict, dictSize, ZSTD_dlm_byCopy, ZSTD_dct_auto);
}
size_t ZSTD_CCtx_refCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict)
{
RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
"Can't ref a dict when ctx not in init stage.");
/* Free the existing local cdict (if any) to save memory. */
ZSTD_clearAllDicts(cctx);
cctx->cdict = cdict;
return 0;
}
size_t ZSTD_CCtx_refThreadPool(ZSTD_CCtx* cctx, ZSTD_threadPool* pool)
{
RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
"Can't ref a pool when ctx not in init stage.");
cctx->pool = pool;
return 0;
}
size_t ZSTD_CCtx_refPrefix(ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize)
{
return ZSTD_CCtx_refPrefix_advanced(cctx, prefix, prefixSize, ZSTD_dct_rawContent);
}
size_t ZSTD_CCtx_refPrefix_advanced(
ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize, ZSTD_dictContentType_e dictContentType)
{
RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
"Can't ref a prefix when ctx not in init stage.");
ZSTD_clearAllDicts(cctx);
if (prefix != NULL && prefixSize > 0) {
cctx->prefixDict.dict = prefix;
cctx->prefixDict.dictSize = prefixSize;
cctx->prefixDict.dictContentType = dictContentType;
}
return 0;
}
/*! ZSTD_CCtx_reset() :
* Also dumps dictionary */
size_t ZSTD_CCtx_reset(ZSTD_CCtx* cctx, ZSTD_ResetDirective reset)
{
if ( (reset == ZSTD_reset_session_only)
|| (reset == ZSTD_reset_session_and_parameters) ) {
cctx->streamStage = zcss_init;
cctx->pledgedSrcSizePlusOne = 0;
}
if ( (reset == ZSTD_reset_parameters)
|| (reset == ZSTD_reset_session_and_parameters) ) {
RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
"Reset parameters is only possible during init stage.");
ZSTD_clearAllDicts(cctx);
return ZSTD_CCtxParams_reset(&cctx->requestedParams);
}
return 0;
}
/** ZSTD_checkCParams() :
control CParam 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)
{
BOUNDCHECK(ZSTD_c_windowLog, (int)cParams.windowLog);
BOUNDCHECK(ZSTD_c_chainLog, (int)cParams.chainLog);
BOUNDCHECK(ZSTD_c_hashLog, (int)cParams.hashLog);
BOUNDCHECK(ZSTD_c_searchLog, (int)cParams.searchLog);
BOUNDCHECK(ZSTD_c_minMatch, (int)cParams.minMatch);
BOUNDCHECK(ZSTD_c_targetLength,(int)cParams.targetLength);
BOUNDCHECK(ZSTD_c_strategy, cParams.strategy);
return 0;
}
/** ZSTD_clampCParams() :
* make CParam values within valid range.
* @return : valid CParams */
static ZSTD_compressionParameters
ZSTD_clampCParams(ZSTD_compressionParameters cParams)
{
# define CLAMP_TYPE(cParam, val, type) \
do { \
ZSTD_bounds const bounds = ZSTD_cParam_getBounds(cParam); \
if ((int)val<bounds.lowerBound) val=(type)bounds.lowerBound; \
else if ((int)val>bounds.upperBound) val=(type)bounds.upperBound; \
} while (0)
# define CLAMP(cParam, val) CLAMP_TYPE(cParam, val, unsigned)
CLAMP(ZSTD_c_windowLog, cParams.windowLog);
CLAMP(ZSTD_c_chainLog, cParams.chainLog);
CLAMP(ZSTD_c_hashLog, cParams.hashLog);
CLAMP(ZSTD_c_searchLog, cParams.searchLog);
CLAMP(ZSTD_c_minMatch, cParams.minMatch);
CLAMP(ZSTD_c_targetLength,cParams.targetLength);
CLAMP_TYPE(ZSTD_c_strategy,cParams.strategy, ZSTD_strategy);
return cParams;
}
/** ZSTD_cycleLog() :
* condition for correct operation : hashLog > 1 */
U32 ZSTD_cycleLog(U32 hashLog, ZSTD_strategy strat)
{
U32 const btScale = ((U32)strat >= (U32)ZSTD_btlazy2);
return hashLog - btScale;
}
/** ZSTD_dictAndWindowLog() :
* Returns an adjusted window log that is large enough to fit the source and the dictionary.
* The zstd format says that the entire dictionary is valid if one byte of the dictionary
* is within the window. So the hashLog and chainLog should be large enough to reference both
* the dictionary and the window. So we must use this adjusted dictAndWindowLog when downsizing
* the hashLog and windowLog.
* NOTE: srcSize must not be ZSTD_CONTENTSIZE_UNKNOWN.
*/
static U32 ZSTD_dictAndWindowLog(U32 windowLog, U64 srcSize, U64 dictSize)
{
const U64 maxWindowSize = 1ULL << ZSTD_WINDOWLOG_MAX;
/* No dictionary ==> No change */
if (dictSize == 0) {
return windowLog;
}
assert(windowLog <= ZSTD_WINDOWLOG_MAX);
assert(srcSize != ZSTD_CONTENTSIZE_UNKNOWN); /* Handled in ZSTD_adjustCParams_internal() */
{
U64 const windowSize = 1ULL << windowLog;
U64 const dictAndWindowSize = dictSize + windowSize;
/* If the window size is already large enough to fit both the source and the dictionary
* then just use the window size. Otherwise adjust so that it fits the dictionary and
* the window.
*/
if (windowSize >= dictSize + srcSize) {
return windowLog; /* Window size large enough already */
} else if (dictAndWindowSize >= maxWindowSize) {
return ZSTD_WINDOWLOG_MAX; /* Larger than max window log */
} else {
return ZSTD_highbit32((U32)dictAndWindowSize - 1) + 1;
}
}
}
/** ZSTD_adjustCParams_internal() :
* optimize `cPar` for a specified input (`srcSize` and `dictSize`).
* mostly downsize to reduce memory consumption and initialization latency.
* `srcSize` can be ZSTD_CONTENTSIZE_UNKNOWN when not known.
* `mode` is the mode for parameter adjustment. See docs for `ZSTD_cParamMode_e`.
* note : `srcSize==0` means 0!
* condition : cPar is presumed validated (can be checked using ZSTD_checkCParams()). */
static ZSTD_compressionParameters
ZSTD_adjustCParams_internal(ZSTD_compressionParameters cPar,
unsigned long long srcSize,
size_t dictSize,
ZSTD_cParamMode_e mode,
ZSTD_paramSwitch_e useRowMatchFinder)
{
const U64 minSrcSize = 513; /* (1<<9) + 1 */
const U64 maxWindowResize = 1ULL << (ZSTD_WINDOWLOG_MAX-1);
assert(ZSTD_checkCParams(cPar)==0);
/* Cascade the selected strategy down to the next-highest one built into
* this binary. */
#ifdef ZSTD_EXCLUDE_BTULTRA_BLOCK_COMPRESSOR
if (cPar.strategy == ZSTD_btultra2) {
cPar.strategy = ZSTD_btultra;
}
if (cPar.strategy == ZSTD_btultra) {
cPar.strategy = ZSTD_btopt;
}
#endif
#ifdef ZSTD_EXCLUDE_BTOPT_BLOCK_COMPRESSOR
if (cPar.strategy == ZSTD_btopt) {
cPar.strategy = ZSTD_btlazy2;
}
#endif
#ifdef ZSTD_EXCLUDE_BTLAZY2_BLOCK_COMPRESSOR
if (cPar.strategy == ZSTD_btlazy2) {
cPar.strategy = ZSTD_lazy2;
}
#endif
#ifdef ZSTD_EXCLUDE_LAZY2_BLOCK_COMPRESSOR
if (cPar.strategy == ZSTD_lazy2) {
cPar.strategy = ZSTD_lazy;
}
#endif
#ifdef ZSTD_EXCLUDE_LAZY_BLOCK_COMPRESSOR
if (cPar.strategy == ZSTD_lazy) {
cPar.strategy = ZSTD_greedy;
}
#endif
#ifdef ZSTD_EXCLUDE_GREEDY_BLOCK_COMPRESSOR
if (cPar.strategy == ZSTD_greedy) {
cPar.strategy = ZSTD_dfast;
}
#endif
#ifdef ZSTD_EXCLUDE_DFAST_BLOCK_COMPRESSOR
if (cPar.strategy == ZSTD_dfast) {
cPar.strategy = ZSTD_fast;
cPar.targetLength = 0;
}
#endif
switch (mode) {
case ZSTD_cpm_unknown:
case ZSTD_cpm_noAttachDict:
/* If we don't know the source size, don't make any
* assumptions about it. We will already have selected
* smaller parameters if a dictionary is in use.
*/
break;
case ZSTD_cpm_createCDict:
/* Assume a small source size when creating a dictionary
* with an unknown source size.
*/
if (dictSize && srcSize == ZSTD_CONTENTSIZE_UNKNOWN)
srcSize = minSrcSize;
break;
case ZSTD_cpm_attachDict:
/* Dictionary has its own dedicated parameters which have
* already been selected. We are selecting parameters
* for only the source.
*/
dictSize = 0;
break;
default:
assert(0);
break;
}
/* resize windowLog if input is small enough, to use less memory */
if ( (srcSize <= maxWindowResize)
&& (dictSize <= maxWindowResize) ) {
U32 const tSize = (U32)(srcSize + dictSize);
static U32 const hashSizeMin = 1 << ZSTD_HASHLOG_MIN;
U32 const srcLog = (tSize < hashSizeMin) ? ZSTD_HASHLOG_MIN :
ZSTD_highbit32(tSize-1) + 1;
if (cPar.windowLog > srcLog) cPar.windowLog = srcLog;
}
if (srcSize != ZSTD_CONTENTSIZE_UNKNOWN) {
U32 const dictAndWindowLog = ZSTD_dictAndWindowLog(cPar.windowLog, (U64)srcSize, (U64)dictSize);
U32 const cycleLog = ZSTD_cycleLog(cPar.chainLog, cPar.strategy);
if (cPar.hashLog > dictAndWindowLog+1) cPar.hashLog = dictAndWindowLog+1;
if (cycleLog > dictAndWindowLog)
cPar.chainLog -= (cycleLog - dictAndWindowLog);
}
if (cPar.windowLog < ZSTD_WINDOWLOG_ABSOLUTEMIN)
cPar.windowLog = ZSTD_WINDOWLOG_ABSOLUTEMIN; /* minimum wlog required for valid frame header */
/* We can't use more than 32 bits of hash in total, so that means that we require:
* (hashLog + 8) <= 32 && (chainLog + 8) <= 32
*/
if (mode == ZSTD_cpm_createCDict && ZSTD_CDictIndicesAreTagged(&cPar)) {
U32 const maxShortCacheHashLog = 32 - ZSTD_SHORT_CACHE_TAG_BITS;
if (cPar.hashLog > maxShortCacheHashLog) {
cPar.hashLog = maxShortCacheHashLog;
}
if (cPar.chainLog > maxShortCacheHashLog) {
cPar.chainLog = maxShortCacheHashLog;
}
}
/* At this point, we aren't 100% sure if we are using the row match finder.
* Unless it is explicitly disabled, conservatively assume that it is enabled.
* In this case it will only be disabled for small sources, so shrinking the
* hash log a little bit shouldn't result in any ratio loss.
*/
if (useRowMatchFinder == ZSTD_ps_auto)
useRowMatchFinder = ZSTD_ps_enable;
/* We can't hash more than 32-bits in total. So that means that we require:
* (hashLog - rowLog + 8) <= 32
*/
if (ZSTD_rowMatchFinderUsed(cPar.strategy, useRowMatchFinder)) {
/* Switch to 32-entry rows if searchLog is 5 (or more) */
U32 const rowLog = BOUNDED(4, cPar.searchLog, 6);
U32 const maxRowHashLog = 32 - ZSTD_ROW_HASH_TAG_BITS;
U32 const maxHashLog = maxRowHashLog + rowLog;
assert(cPar.hashLog >= rowLog);
if (cPar.hashLog > maxHashLog) {
cPar.hashLog = maxHashLog;
}
}
return cPar;
}
ZSTD_compressionParameters
ZSTD_adjustCParams(ZSTD_compressionParameters cPar,
unsigned long long srcSize,
size_t dictSize)
{
cPar = ZSTD_clampCParams(cPar); /* resulting cPar is necessarily valid (all parameters within range) */
if (srcSize == 0) srcSize = ZSTD_CONTENTSIZE_UNKNOWN;
return ZSTD_adjustCParams_internal(cPar, srcSize, dictSize, ZSTD_cpm_unknown, ZSTD_ps_auto);
}
static ZSTD_compressionParameters ZSTD_getCParams_internal(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode);
static ZSTD_parameters ZSTD_getParams_internal(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode);
static void ZSTD_overrideCParams(
ZSTD_compressionParameters* cParams,
const ZSTD_compressionParameters* overrides)
{
if (overrides->windowLog) cParams->windowLog = overrides->windowLog;
if (overrides->hashLog) cParams->hashLog = overrides->hashLog;
if (overrides->chainLog) cParams->chainLog = overrides->chainLog;
if (overrides->searchLog) cParams->searchLog = overrides->searchLog;
if (overrides->minMatch) cParams->minMatch = overrides->minMatch;
if (overrides->targetLength) cParams->targetLength = overrides->targetLength;
if (overrides->strategy) cParams->strategy = overrides->strategy;
}
ZSTD_compressionParameters ZSTD_getCParamsFromCCtxParams(
const ZSTD_CCtx_params* CCtxParams, U64 srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode)
{
ZSTD_compressionParameters cParams;
if (srcSizeHint == ZSTD_CONTENTSIZE_UNKNOWN && CCtxParams->srcSizeHint > 0) {
srcSizeHint = CCtxParams->srcSizeHint;
}
cParams = ZSTD_getCParams_internal(CCtxParams->compressionLevel, srcSizeHint, dictSize, mode);
if (CCtxParams->ldmParams.enableLdm == ZSTD_ps_enable) cParams.windowLog = ZSTD_LDM_DEFAULT_WINDOW_LOG;
ZSTD_overrideCParams(&cParams, &CCtxParams->cParams);
assert(!ZSTD_checkCParams(cParams));
/* srcSizeHint == 0 means 0 */
return ZSTD_adjustCParams_internal(cParams, srcSizeHint, dictSize, mode, CCtxParams->useRowMatchFinder);
}
static size_t
ZSTD_sizeof_matchState(const ZSTD_compressionParameters* const cParams,
const ZSTD_paramSwitch_e useRowMatchFinder,
const U32 enableDedicatedDictSearch,
const U32 forCCtx)
{
/* chain table size should be 0 for fast or row-hash strategies */
size_t const chainSize = ZSTD_allocateChainTable(cParams->strategy, useRowMatchFinder, enableDedicatedDictSearch && !forCCtx)
? ((size_t)1 << cParams->chainLog)
: 0;
size_t const hSize = ((size_t)1) << cParams->hashLog;
U32 const hashLog3 = (forCCtx && cParams->minMatch==3) ? MIN(ZSTD_HASHLOG3_MAX, cParams->windowLog) : 0;
size_t const h3Size = hashLog3 ? ((size_t)1) << hashLog3 : 0;
/* We don't use ZSTD_cwksp_alloc_size() here because the tables aren't
* surrounded by redzones in ASAN. */
size_t const tableSpace = chainSize * sizeof(U32)
+ hSize * sizeof(U32)
+ h3Size * sizeof(U32);
size_t const optPotentialSpace =
ZSTD_cwksp_aligned_alloc_size((MaxML+1) * sizeof(U32))
+ ZSTD_cwksp_aligned_alloc_size((MaxLL+1) * sizeof(U32))
+ ZSTD_cwksp_aligned_alloc_size((MaxOff+1) * sizeof(U32))
+ ZSTD_cwksp_aligned_alloc_size((1<<Litbits) * sizeof(U32))
+ ZSTD_cwksp_aligned_alloc_size(ZSTD_OPT_SIZE * sizeof(ZSTD_match_t))
+ ZSTD_cwksp_aligned_alloc_size(ZSTD_OPT_SIZE * sizeof(ZSTD_optimal_t));
size_t const lazyAdditionalSpace = ZSTD_rowMatchFinderUsed(cParams->strategy, useRowMatchFinder)
? ZSTD_cwksp_aligned_alloc_size(hSize)
: 0;
size_t const optSpace = (forCCtx && (cParams->strategy >= ZSTD_btopt))
? optPotentialSpace
: 0;
size_t const slackSpace = ZSTD_cwksp_slack_space_required();
/* tables are guaranteed to be sized in multiples of 64 bytes (or 16 uint32_t) */
ZSTD_STATIC_ASSERT(ZSTD_HASHLOG_MIN >= 4 && ZSTD_WINDOWLOG_MIN >= 4 && ZSTD_CHAINLOG_MIN >= 4);
assert(useRowMatchFinder != ZSTD_ps_auto);
DEBUGLOG(4, "chainSize: %u - hSize: %u - h3Size: %u",
(U32)chainSize, (U32)hSize, (U32)h3Size);
return tableSpace + optSpace + slackSpace + lazyAdditionalSpace;
}
/* Helper function for calculating memory requirements.
* Gives a tighter bound than ZSTD_sequenceBound() by taking minMatch into account. */
static size_t ZSTD_maxNbSeq(size_t blockSize, unsigned minMatch, int useSequenceProducer) {
U32 const divider = (minMatch==3 || useSequenceProducer) ? 3 : 4;
return blockSize / divider;
}
static size_t ZSTD_estimateCCtxSize_usingCCtxParams_internal(
const ZSTD_compressionParameters* cParams,
const ldmParams_t* ldmParams,
const int isStatic,
const ZSTD_paramSwitch_e useRowMatchFinder,
const size_t buffInSize,
const size_t buffOutSize,
const U64 pledgedSrcSize,
int useSequenceProducer,
size_t maxBlockSize)
{
size_t const windowSize = (size_t) BOUNDED(1ULL, 1ULL << cParams->windowLog, pledgedSrcSize);
size_t const blockSize = MIN(ZSTD_resolveMaxBlockSize(maxBlockSize), windowSize);
size_t const maxNbSeq = ZSTD_maxNbSeq(blockSize, cParams->minMatch, useSequenceProducer);
size_t const tokenSpace = ZSTD_cwksp_alloc_size(WILDCOPY_OVERLENGTH + blockSize)
+ ZSTD_cwksp_aligned_alloc_size(maxNbSeq * sizeof(seqDef))
+ 3 * ZSTD_cwksp_alloc_size(maxNbSeq * sizeof(BYTE));
size_t const entropySpace = ZSTD_cwksp_alloc_size(ENTROPY_WORKSPACE_SIZE);
size_t const blockStateSpace = 2 * ZSTD_cwksp_alloc_size(sizeof(ZSTD_compressedBlockState_t));
size_t const matchStateSize = ZSTD_sizeof_matchState(cParams, useRowMatchFinder, /* enableDedicatedDictSearch */ 0, /* forCCtx */ 1);
size_t const ldmSpace = ZSTD_ldm_getTableSize(*ldmParams);
size_t const maxNbLdmSeq = ZSTD_ldm_getMaxNbSeq(*ldmParams, blockSize);
size_t const ldmSeqSpace = ldmParams->enableLdm == ZSTD_ps_enable ?
ZSTD_cwksp_aligned_alloc_size(maxNbLdmSeq * sizeof(rawSeq)) : 0;
size_t const bufferSpace = ZSTD_cwksp_alloc_size(buffInSize)
+ ZSTD_cwksp_alloc_size(buffOutSize);
size_t const cctxSpace = isStatic ? ZSTD_cwksp_alloc_size(sizeof(ZSTD_CCtx)) : 0;
size_t const maxNbExternalSeq = ZSTD_sequenceBound(blockSize);
size_t const externalSeqSpace = useSequenceProducer
? ZSTD_cwksp_aligned_alloc_size(maxNbExternalSeq * sizeof(ZSTD_Sequence))
: 0;
size_t const neededSpace =
cctxSpace +
entropySpace +
blockStateSpace +
ldmSpace +
ldmSeqSpace +
matchStateSize +
tokenSpace +
bufferSpace +
externalSeqSpace;
DEBUGLOG(5, "estimate workspace : %u", (U32)neededSpace);
return neededSpace;
}
size_t ZSTD_estimateCCtxSize_usingCCtxParams(const ZSTD_CCtx_params* params)
{
ZSTD_compressionParameters const cParams =
ZSTD_getCParamsFromCCtxParams(params, ZSTD_CONTENTSIZE_UNKNOWN, 0, ZSTD_cpm_noAttachDict);
ZSTD_paramSwitch_e const useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(params->useRowMatchFinder,
&cParams);
RETURN_ERROR_IF(params->nbWorkers > 0, GENERIC, "Estimate CCtx size is supported for single-threaded compression only.");
/* estimateCCtxSize is for one-shot compression. So no buffers should
* be needed. However, we still allocate two 0-sized buffers, which can
* take space under ASAN. */
return ZSTD_estimateCCtxSize_usingCCtxParams_internal(
&cParams, &params->ldmParams, 1, useRowMatchFinder, 0, 0, ZSTD_CONTENTSIZE_UNKNOWN, ZSTD_hasExtSeqProd(params), params->maxBlockSize);
}
size_t ZSTD_estimateCCtxSize_usingCParams(ZSTD_compressionParameters cParams)
{
ZSTD_CCtx_params initialParams = ZSTD_makeCCtxParamsFromCParams(cParams);
if (ZSTD_rowMatchFinderSupported(cParams.strategy)) {
/* Pick bigger of not using and using row-based matchfinder for greedy and lazy strategies */
size_t noRowCCtxSize;
size_t rowCCtxSize;
initialParams.useRowMatchFinder = ZSTD_ps_disable;
noRowCCtxSize = ZSTD_estimateCCtxSize_usingCCtxParams(&initialParams);
initialParams.useRowMatchFinder = ZSTD_ps_enable;
rowCCtxSize = ZSTD_estimateCCtxSize_usingCCtxParams(&initialParams);
return MAX(noRowCCtxSize, rowCCtxSize);
} else {
return ZSTD_estimateCCtxSize_usingCCtxParams(&initialParams);
}
}
static size_t ZSTD_estimateCCtxSize_internal(int compressionLevel)
{
int tier = 0;
size_t largestSize = 0;
static const unsigned long long srcSizeTiers[4] = {16 KB, 128 KB, 256 KB, ZSTD_CONTENTSIZE_UNKNOWN};
for (; tier < 4; ++tier) {
/* Choose the set of cParams for a given level across all srcSizes that give the largest cctxSize */
ZSTD_compressionParameters const cParams = ZSTD_getCParams_internal(compressionLevel, srcSizeTiers[tier], 0, ZSTD_cpm_noAttachDict);
largestSize = MAX(ZSTD_estimateCCtxSize_usingCParams(cParams), largestSize);
}
return largestSize;
}
size_t ZSTD_estimateCCtxSize(int compressionLevel)
{
int level;
size_t memBudget = 0;
for (level=MIN(compressionLevel, 1); level<=compressionLevel; level++) {
/* Ensure monotonically increasing memory usage as compression level increases */
size_t const newMB = ZSTD_estimateCCtxSize_internal(level);
if (newMB > memBudget) memBudget = newMB;
}
return memBudget;
}
size_t ZSTD_estimateCStreamSize_usingCCtxParams(const ZSTD_CCtx_params* params)
{
RETURN_ERROR_IF(params->nbWorkers > 0, GENERIC, "Estimate CCtx size is supported for single-threaded compression only.");
{ ZSTD_compressionParameters const cParams =
ZSTD_getCParamsFromCCtxParams(params, ZSTD_CONTENTSIZE_UNKNOWN, 0, ZSTD_cpm_noAttachDict);
size_t const blockSize = MIN(ZSTD_resolveMaxBlockSize(params->maxBlockSize), (size_t)1 << cParams.windowLog);
size_t const inBuffSize = (params->inBufferMode == ZSTD_bm_buffered)
? ((size_t)1 << cParams.windowLog) + blockSize
: 0;
size_t const outBuffSize = (params->outBufferMode == ZSTD_bm_buffered)
? ZSTD_compressBound(blockSize) + 1
: 0;
ZSTD_paramSwitch_e const useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(params->useRowMatchFinder, &params->cParams);
return ZSTD_estimateCCtxSize_usingCCtxParams_internal(
&cParams, &params->ldmParams, 1, useRowMatchFinder, inBuffSize, outBuffSize,
ZSTD_CONTENTSIZE_UNKNOWN, ZSTD_hasExtSeqProd(params), params->maxBlockSize);
}
}
size_t ZSTD_estimateCStreamSize_usingCParams(ZSTD_compressionParameters cParams)
{
ZSTD_CCtx_params initialParams = ZSTD_makeCCtxParamsFromCParams(cParams);
if (ZSTD_rowMatchFinderSupported(cParams.strategy)) {
/* Pick bigger of not using and using row-based matchfinder for greedy and lazy strategies */
size_t noRowCCtxSize;
size_t rowCCtxSize;
initialParams.useRowMatchFinder = ZSTD_ps_disable;
noRowCCtxSize = ZSTD_estimateCStreamSize_usingCCtxParams(&initialParams);
initialParams.useRowMatchFinder = ZSTD_ps_enable;
rowCCtxSize = ZSTD_estimateCStreamSize_usingCCtxParams(&initialParams);
return MAX(noRowCCtxSize, rowCCtxSize);
} else {
return ZSTD_estimateCStreamSize_usingCCtxParams(&initialParams);
}
}
static size_t ZSTD_estimateCStreamSize_internal(int compressionLevel)
{
ZSTD_compressionParameters const cParams = ZSTD_getCParams_internal(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, 0, ZSTD_cpm_noAttachDict);
return ZSTD_estimateCStreamSize_usingCParams(cParams);
}
size_t ZSTD_estimateCStreamSize(int compressionLevel)
{
int level;
size_t memBudget = 0;
for (level=MIN(compressionLevel, 1); level<=compressionLevel; level++) {
size_t const newMB = ZSTD_estimateCStreamSize_internal(level);
if (newMB > memBudget) memBudget = newMB;
}
return memBudget;
}
/* ZSTD_getFrameProgression():
* tells how much data has been consumed (input) and produced (output) for current frame.
* able to count progression inside worker threads (non-blocking mode).
*/
ZSTD_frameProgression ZSTD_getFrameProgression(const ZSTD_CCtx* cctx)
{
#ifdef ZSTD_MULTITHREAD
if (cctx->appliedParams.nbWorkers > 0) {
return ZSTDMT_getFrameProgression(cctx->mtctx);
}
#endif
{ ZSTD_frameProgression fp;
size_t const buffered = (cctx->inBuff == NULL) ? 0 :
cctx->inBuffPos - cctx->inToCompress;
if (buffered) assert(cctx->inBuffPos >= cctx->inToCompress);
assert(buffered <= ZSTD_BLOCKSIZE_MAX);
fp.ingested = cctx->consumedSrcSize + buffered;
fp.consumed = cctx->consumedSrcSize;
fp.produced = cctx->producedCSize;
fp.flushed = cctx->producedCSize; /* simplified; some data might still be left within streaming output buffer */
fp.currentJobID = 0;
fp.nbActiveWorkers = 0;
return fp;
} }
/*! ZSTD_toFlushNow()
* Only useful for multithreading scenarios currently (nbWorkers >= 1).
*/
size_t ZSTD_toFlushNow(ZSTD_CCtx* cctx)
{
#ifdef ZSTD_MULTITHREAD
if (cctx->appliedParams.nbWorkers > 0) {
return ZSTDMT_toFlushNow(cctx->mtctx);
}
#endif
(void)cctx;
return 0; /* over-simplification; could also check if context is currently running in streaming mode, and in which case, report how many bytes are left to be flushed within output buffer */
}
static void ZSTD_assertEqualCParams(ZSTD_compressionParameters cParams1,
ZSTD_compressionParameters cParams2)
{
(void)cParams1;
(void)cParams2;
assert(cParams1.windowLog == cParams2.windowLog);
assert(cParams1.chainLog == cParams2.chainLog);
assert(cParams1.hashLog == cParams2.hashLog);
assert(cParams1.searchLog == cParams2.searchLog);
assert(cParams1.minMatch == cParams2.minMatch);
assert(cParams1.targetLength == cParams2.targetLength);
assert(cParams1.strategy == cParams2.strategy);
}
void ZSTD_reset_compressedBlockState(ZSTD_compressedBlockState_t* bs)
{
int i;
for (i = 0; i < ZSTD_REP_NUM; ++i)
bs->rep[i] = repStartValue[i];
bs->entropy.huf.repeatMode = HUF_repeat_none;
bs->entropy.fse.offcode_repeatMode = FSE_repeat_none;
bs->entropy.fse.matchlength_repeatMode = FSE_repeat_none;
bs->entropy.fse.litlength_repeatMode = FSE_repeat_none;
}
/*! ZSTD_invalidateMatchState()
* Invalidate all the matches in the match finder tables.
* Requires nextSrc and base to be set (can be NULL).
*/
static void ZSTD_invalidateMatchState(ZSTD_matchState_t* ms)
{
ZSTD_window_clear(&ms->window);
ms->nextToUpdate = ms->window.dictLimit;
ms->loadedDictEnd = 0;
ms->opt.litLengthSum = 0; /* force reset of btopt stats */
ms->dictMatchState = NULL;
}
/**
* Controls, for this matchState reset, whether the tables need to be cleared /
* prepared for the coming compression (ZSTDcrp_makeClean), or whether the
* tables can be left unclean (ZSTDcrp_leaveDirty), because we know that a
* subsequent operation will overwrite the table space anyways (e.g., copying
* the matchState contents in from a CDict).
*/
typedef enum {
ZSTDcrp_makeClean,
ZSTDcrp_leaveDirty
} ZSTD_compResetPolicy_e;
/**
* Controls, for this matchState reset, whether indexing can continue where it
* left off (ZSTDirp_continue), or whether it needs to be restarted from zero
* (ZSTDirp_reset).
*/
typedef enum {
ZSTDirp_continue,
ZSTDirp_reset
} ZSTD_indexResetPolicy_e;
typedef enum {
ZSTD_resetTarget_CDict,
ZSTD_resetTarget_CCtx
} ZSTD_resetTarget_e;
/* Mixes bits in a 64 bits in a value, based on XXH3_rrmxmx */
static U64 ZSTD_bitmix(U64 val, U64 len) {
val ^= ZSTD_rotateRight_U64(val, 49) ^ ZSTD_rotateRight_U64(val, 24);
val *= 0x9FB21C651E98DF25ULL;
val ^= (val >> 35) + len ;
val *= 0x9FB21C651E98DF25ULL;
return val ^ (val >> 28);
}
/* Mixes in the hashSalt and hashSaltEntropy to create a new hashSalt */
static void ZSTD_advanceHashSalt(ZSTD_matchState_t* ms) {
ms->hashSalt = ZSTD_bitmix(ms->hashSalt, 8) ^ ZSTD_bitmix((U64) ms->hashSaltEntropy, 4);
}
static size_t
ZSTD_reset_matchState(ZSTD_matchState_t* ms,
ZSTD_cwksp* ws,
const ZSTD_compressionParameters* cParams,
const ZSTD_paramSwitch_e useRowMatchFinder,
const ZSTD_compResetPolicy_e crp,
const ZSTD_indexResetPolicy_e forceResetIndex,
const ZSTD_resetTarget_e forWho)
{
/* disable chain table allocation for fast or row-based strategies */
size_t const chainSize = ZSTD_allocateChainTable(cParams->strategy, useRowMatchFinder,
ms->dedicatedDictSearch && (forWho == ZSTD_resetTarget_CDict))
? ((size_t)1 << cParams->chainLog)
: 0;
size_t const hSize = ((size_t)1) << cParams->hashLog;
U32 const hashLog3 = ((forWho == ZSTD_resetTarget_CCtx) && cParams->minMatch==3) ? MIN(ZSTD_HASHLOG3_MAX, cParams->windowLog) : 0;
size_t const h3Size = hashLog3 ? ((size_t)1) << hashLog3 : 0;
DEBUGLOG(4, "reset indices : %u", forceResetIndex == ZSTDirp_reset);
assert(useRowMatchFinder != ZSTD_ps_auto);
if (forceResetIndex == ZSTDirp_reset) {
ZSTD_window_init(&ms->window);
ZSTD_cwksp_mark_tables_dirty(ws);
}
ms->hashLog3 = hashLog3;
ms->lazySkipping = 0;
ZSTD_invalidateMatchState(ms);
assert(!ZSTD_cwksp_reserve_failed(ws)); /* check that allocation hasn't already failed */
ZSTD_cwksp_clear_tables(ws);
DEBUGLOG(5, "reserving table space");
/* table Space */
ms->hashTable = (U32*)ZSTD_cwksp_reserve_table(ws, hSize * sizeof(U32));
ms->chainTable = (U32*)ZSTD_cwksp_reserve_table(ws, chainSize * sizeof(U32));
ms->hashTable3 = (U32*)ZSTD_cwksp_reserve_table(ws, h3Size * sizeof(U32));
RETURN_ERROR_IF(ZSTD_cwksp_reserve_failed(ws), memory_allocation,
"failed a workspace allocation in ZSTD_reset_matchState");
DEBUGLOG(4, "reset table : %u", crp!=ZSTDcrp_leaveDirty);
if (crp!=ZSTDcrp_leaveDirty) {
/* reset tables only */
ZSTD_cwksp_clean_tables(ws);
}
if (ZSTD_rowMatchFinderUsed(cParams->strategy, useRowMatchFinder)) {
/* Row match finder needs an additional table of hashes ("tags") */
size_t const tagTableSize = hSize;
/* We want to generate a new salt in case we reset a Cctx, but we always want to use
* 0 when we reset a Cdict */
if(forWho == ZSTD_resetTarget_CCtx) {
ms->tagTable = (BYTE*) ZSTD_cwksp_reserve_aligned_init_once(ws, tagTableSize);
ZSTD_advanceHashSalt(ms);
} else {
/* When we are not salting we want to always memset the memory */
ms->tagTable = (BYTE*) ZSTD_cwksp_reserve_aligned(ws, tagTableSize);
ZSTD_memset(ms->tagTable, 0, tagTableSize);
ms->hashSalt = 0;
}
{ /* Switch to 32-entry rows if searchLog is 5 (or more) */
U32 const rowLog = BOUNDED(4, cParams->searchLog, 6);
assert(cParams->hashLog >= rowLog);
ms->rowHashLog = cParams->hashLog - rowLog;
}
}
/* opt parser space */
if ((forWho == ZSTD_resetTarget_CCtx) && (cParams->strategy >= ZSTD_btopt)) {
DEBUGLOG(4, "reserving optimal parser space");
ms->opt.litFreq = (unsigned*)ZSTD_cwksp_reserve_aligned(ws, (1<<Litbits) * sizeof(unsigned));
ms->opt.litLengthFreq = (unsigned*)ZSTD_cwksp_reserve_aligned(ws, (MaxLL+1) * sizeof(unsigned));
ms->opt.matchLengthFreq = (unsigned*)ZSTD_cwksp_reserve_aligned(ws, (MaxML+1) * sizeof(unsigned));
ms->opt.offCodeFreq = (unsigned*)ZSTD_cwksp_reserve_aligned(ws, (MaxOff+1) * sizeof(unsigned));
ms->opt.matchTable = (ZSTD_match_t*)ZSTD_cwksp_reserve_aligned(ws, ZSTD_OPT_SIZE * sizeof(ZSTD_match_t));
ms->opt.priceTable = (ZSTD_optimal_t*)ZSTD_cwksp_reserve_aligned(ws, ZSTD_OPT_SIZE * sizeof(ZSTD_optimal_t));
}
ms->cParams = *cParams;
RETURN_ERROR_IF(ZSTD_cwksp_reserve_failed(ws), memory_allocation,
"failed a workspace allocation in ZSTD_reset_matchState");
return 0;
}
/* ZSTD_indexTooCloseToMax() :
* minor optimization : prefer memset() rather than reduceIndex()
* which is measurably slow in some circumstances (reported for Visual Studio).
* Works when re-using a context for a lot of smallish inputs :
* if all inputs are smaller than ZSTD_INDEXOVERFLOW_MARGIN,
* memset() will be triggered before reduceIndex().
*/
#define ZSTD_INDEXOVERFLOW_MARGIN (16 MB)
static int ZSTD_indexTooCloseToMax(ZSTD_window_t w)
{
return (size_t)(w.nextSrc - w.base) > (ZSTD_CURRENT_MAX - ZSTD_INDEXOVERFLOW_MARGIN);
}
/** ZSTD_dictTooBig():
* When dictionaries are larger than ZSTD_CHUNKSIZE_MAX they can't be loaded in
* one go generically. So we ensure that in that case we reset the tables to zero,
* so that we can load as much of the dictionary as possible.
*/
static int ZSTD_dictTooBig(size_t const loadedDictSize)
{
return loadedDictSize > ZSTD_CHUNKSIZE_MAX;
}
/*! ZSTD_resetCCtx_internal() :
* @param loadedDictSize The size of the dictionary to be loaded
* into the context, if any. If no dictionary is used, or the
* dictionary is being attached / copied, then pass 0.
* note : `params` are assumed fully validated at this stage.
*/
static size_t ZSTD_resetCCtx_internal(ZSTD_CCtx* zc,
ZSTD_CCtx_params const* params,
U64 const pledgedSrcSize,
size_t const loadedDictSize,
ZSTD_compResetPolicy_e const crp,
ZSTD_buffered_policy_e const zbuff)
{
ZSTD_cwksp* const ws = &zc->workspace;
DEBUGLOG(4, "ZSTD_resetCCtx_internal: pledgedSrcSize=%u, wlog=%u, useRowMatchFinder=%d useBlockSplitter=%d",
(U32)pledgedSrcSize, params->cParams.windowLog, (int)params->useRowMatchFinder, (int)params->useBlockSplitter);
assert(!ZSTD_isError(ZSTD_checkCParams(params->cParams)));
zc->isFirstBlock = 1;
/* Set applied params early so we can modify them for LDM,
* and point params at the applied params.
*/
zc->appliedParams = *params;
params = &zc->appliedParams;
assert(params->useRowMatchFinder != ZSTD_ps_auto);
assert(params->useBlockSplitter != ZSTD_ps_auto);
assert(params->ldmParams.enableLdm != ZSTD_ps_auto);
assert(params->maxBlockSize != 0);
if (params->ldmParams.enableLdm == ZSTD_ps_enable) {
/* Adjust long distance matching parameters */
ZSTD_ldm_adjustParameters(&zc->appliedParams.ldmParams, &params->cParams);
assert(params->ldmParams.hashLog >= params->ldmParams.bucketSizeLog);
assert(params->ldmParams.hashRateLog < 32);
}
{ size_t const windowSize = MAX(1, (size_t)MIN(((U64)1 << params->cParams.windowLog), pledgedSrcSize));
size_t const blockSize = MIN(params->maxBlockSize, windowSize);
size_t const maxNbSeq = ZSTD_maxNbSeq(blockSize, params->cParams.minMatch, ZSTD_hasExtSeqProd(params));
size_t const buffOutSize = (zbuff == ZSTDb_buffered && params->outBufferMode == ZSTD_bm_buffered)
? ZSTD_compressBound(blockSize) + 1
: 0;
size_t const buffInSize = (zbuff == ZSTDb_buffered && params->inBufferMode == ZSTD_bm_buffered)
? windowSize + blockSize
: 0;
size_t const maxNbLdmSeq = ZSTD_ldm_getMaxNbSeq(params->ldmParams, blockSize);
int const indexTooClose = ZSTD_indexTooCloseToMax(zc->blockState.matchState.window);
int const dictTooBig = ZSTD_dictTooBig(loadedDictSize);
ZSTD_indexResetPolicy_e needsIndexReset =
(indexTooClose || dictTooBig || !zc->initialized) ? ZSTDirp_reset : ZSTDirp_continue;
size_t const neededSpace =
ZSTD_estimateCCtxSize_usingCCtxParams_internal(
&params->cParams, &params->ldmParams, zc->staticSize != 0, params->useRowMatchFinder,
buffInSize, buffOutSize, pledgedSrcSize, ZSTD_hasExtSeqProd(params), params->maxBlockSize);
FORWARD_IF_ERROR(neededSpace, "cctx size estimate failed!");
if (!zc->staticSize) ZSTD_cwksp_bump_oversized_duration(ws, 0);
{ /* Check if workspace is large enough, alloc a new one if needed */
int const workspaceTooSmall = ZSTD_cwksp_sizeof(ws) < neededSpace;
int const workspaceWasteful = ZSTD_cwksp_check_wasteful(ws, neededSpace);
int resizeWorkspace = workspaceTooSmall || workspaceWasteful;
DEBUGLOG(4, "Need %zu B workspace", neededSpace);
DEBUGLOG(4, "windowSize: %zu - blockSize: %zu", windowSize, blockSize);
if (resizeWorkspace) {
DEBUGLOG(4, "Resize workspaceSize from %zuKB to %zuKB",
ZSTD_cwksp_sizeof(ws) >> 10,
neededSpace >> 10);
RETURN_ERROR_IF(zc->staticSize, memory_allocation, "static cctx : no resize");
needsIndexReset = ZSTDirp_reset;
ZSTD_cwksp_free(ws, zc->customMem);
FORWARD_IF_ERROR(ZSTD_cwksp_create(ws, neededSpace, zc->customMem), "");
DEBUGLOG(5, "reserving object space");
/* Statically sized space.
* entropyWorkspace never moves,
* though prev/next block swap places */
assert(ZSTD_cwksp_check_available(ws, 2 * sizeof(ZSTD_compressedBlockState_t)));
zc->blockState.prevCBlock = (ZSTD_compressedBlockState_t*) ZSTD_cwksp_reserve_object(ws, sizeof(ZSTD_compressedBlockState_t));
RETURN_ERROR_IF(zc->blockState.prevCBlock == NULL, memory_allocation, "couldn't allocate prevCBlock");
zc->blockState.nextCBlock = (ZSTD_compressedBlockState_t*) ZSTD_cwksp_reserve_object(ws, sizeof(ZSTD_compressedBlockState_t));
RETURN_ERROR_IF(zc->blockState.nextCBlock == NULL, memory_allocation, "couldn't allocate nextCBlock");
zc->entropyWorkspace = (U32*) ZSTD_cwksp_reserve_object(ws, ENTROPY_WORKSPACE_SIZE);
RETURN_ERROR_IF(zc->entropyWorkspace == NULL, memory_allocation, "couldn't allocate entropyWorkspace");
} }
ZSTD_cwksp_clear(ws);
/* init params */
zc->blockState.matchState.cParams = params->cParams;
zc->blockState.matchState.prefetchCDictTables = params->prefetchCDictTables == ZSTD_ps_enable;
zc->pledgedSrcSizePlusOne = pledgedSrcSize+1;
zc->consumedSrcSize = 0;
zc->producedCSize = 0;
if (pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN)
zc->appliedParams.fParams.contentSizeFlag = 0;
DEBUGLOG(4, "pledged content size : %u ; flag : %u",
(unsigned)pledgedSrcSize, zc->appliedParams.fParams.contentSizeFlag);
zc->blockSize = blockSize;
XXH64_reset(&zc->xxhState, 0);
zc->stage = ZSTDcs_init;
zc->dictID = 0;
zc->dictContentSize = 0;
ZSTD_reset_compressedBlockState(zc->blockState.prevCBlock);
FORWARD_IF_ERROR(ZSTD_reset_matchState(
&zc->blockState.matchState,
ws,
&params->cParams,
params->useRowMatchFinder,
crp,
needsIndexReset,
ZSTD_resetTarget_CCtx), "");
zc->seqStore.sequencesStart = (seqDef*)ZSTD_cwksp_reserve_aligned(ws, maxNbSeq * sizeof(seqDef));
/* ldm hash table */
if (params->ldmParams.enableLdm == ZSTD_ps_enable) {
/* TODO: avoid memset? */
size_t const ldmHSize = ((size_t)1) << params->ldmParams.hashLog;
zc->ldmState.hashTable = (ldmEntry_t*)ZSTD_cwksp_reserve_aligned(ws, ldmHSize * sizeof(ldmEntry_t));
ZSTD_memset(zc->ldmState.hashTable, 0, ldmHSize * sizeof(ldmEntry_t));
zc->ldmSequences = (rawSeq*)ZSTD_cwksp_reserve_aligned(ws, maxNbLdmSeq * sizeof(rawSeq));
zc->maxNbLdmSequences = maxNbLdmSeq;
ZSTD_window_init(&zc->ldmState.window);
zc->ldmState.loadedDictEnd = 0;
}
/* reserve space for block-level external sequences */
if (ZSTD_hasExtSeqProd(params)) {
size_t const maxNbExternalSeq = ZSTD_sequenceBound(blockSize);
zc->extSeqBufCapacity = maxNbExternalSeq;
zc->extSeqBuf =
(ZSTD_Sequence*)ZSTD_cwksp_reserve_aligned(ws, maxNbExternalSeq * sizeof(ZSTD_Sequence));
}
/* buffers */
/* ZSTD_wildcopy() is used to copy into the literals buffer,
* so we have to oversize the buffer by WILDCOPY_OVERLENGTH bytes.
*/
zc->seqStore.litStart = ZSTD_cwksp_reserve_buffer(ws, blockSize + WILDCOPY_OVERLENGTH);
zc->seqStore.maxNbLit = blockSize;
zc->bufferedPolicy = zbuff;
zc->inBuffSize = buffInSize;
zc->inBuff = (char*)ZSTD_cwksp_reserve_buffer(ws, buffInSize);
zc->outBuffSize = buffOutSize;
zc->outBuff = (char*)ZSTD_cwksp_reserve_buffer(ws, buffOutSize);
/* ldm bucketOffsets table */
if (params->ldmParams.enableLdm == ZSTD_ps_enable) {
/* TODO: avoid memset? */
size_t const numBuckets =
((size_t)1) << (params->ldmParams.hashLog -
params->ldmParams.bucketSizeLog);
zc->ldmState.bucketOffsets = ZSTD_cwksp_reserve_buffer(ws, numBuckets);
ZSTD_memset(zc->ldmState.bucketOffsets, 0, numBuckets);
}
/* sequences storage */
ZSTD_referenceExternalSequences(zc, NULL, 0);
zc->seqStore.maxNbSeq = maxNbSeq;
zc->seqStore.llCode = ZSTD_cwksp_reserve_buffer(ws, maxNbSeq * sizeof(BYTE));
zc->seqStore.mlCode = ZSTD_cwksp_reserve_buffer(ws, maxNbSeq * sizeof(BYTE));
zc->seqStore.ofCode = ZSTD_cwksp_reserve_buffer(ws, maxNbSeq * sizeof(BYTE));
DEBUGLOG(3, "wksp: finished allocating, %zd bytes remain available", ZSTD_cwksp_available_space(ws));
assert(ZSTD_cwksp_estimated_space_within_bounds(ws, neededSpace));
zc->initialized = 1;
return 0;
}
}
/* 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->blockState.prevCBlock->rep[i] = 0;
assert(!ZSTD_window_hasExtDict(cctx->blockState.matchState.window));
}
/* These are the approximate sizes for each strategy past which copying the
* dictionary tables into the working context is faster than using them
* in-place.
*/
static const size_t attachDictSizeCutoffs[ZSTD_STRATEGY_MAX+1] = {
8 KB, /* unused */
8 KB, /* ZSTD_fast */
16 KB, /* ZSTD_dfast */
32 KB, /* ZSTD_greedy */
32 KB, /* ZSTD_lazy */
32 KB, /* ZSTD_lazy2 */
32 KB, /* ZSTD_btlazy2 */
32 KB, /* ZSTD_btopt */
8 KB, /* ZSTD_btultra */
8 KB /* ZSTD_btultra2 */
};
static int ZSTD_shouldAttachDict(const ZSTD_CDict* cdict,
const ZSTD_CCtx_params* params,
U64 pledgedSrcSize)
{
size_t cutoff = attachDictSizeCutoffs[cdict->matchState.cParams.strategy];
int const dedicatedDictSearch = cdict->matchState.dedicatedDictSearch;
return dedicatedDictSearch
|| ( ( pledgedSrcSize <= cutoff
|| pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN
|| params->attachDictPref == ZSTD_dictForceAttach )
&& params->attachDictPref != ZSTD_dictForceCopy
&& !params->forceWindow ); /* dictMatchState isn't correctly
* handled in _enforceMaxDist */
}
static size_t
ZSTD_resetCCtx_byAttachingCDict(ZSTD_CCtx* cctx,
const ZSTD_CDict* cdict,
ZSTD_CCtx_params params,
U64 pledgedSrcSize,
ZSTD_buffered_policy_e zbuff)
{
DEBUGLOG(4, "ZSTD_resetCCtx_byAttachingCDict() pledgedSrcSize=%llu",
(unsigned long long)pledgedSrcSize);
{
ZSTD_compressionParameters adjusted_cdict_cParams = cdict->matchState.cParams;
unsigned const windowLog = params.cParams.windowLog;
assert(windowLog != 0);
/* Resize working context table params for input only, since the dict
* has its own tables. */
/* pledgedSrcSize == 0 means 0! */
if (cdict->matchState.dedicatedDictSearch) {
ZSTD_dedicatedDictSearch_revertCParams(&adjusted_cdict_cParams);
}
params.cParams = ZSTD_adjustCParams_internal(adjusted_cdict_cParams, pledgedSrcSize,
cdict->dictContentSize, ZSTD_cpm_attachDict,
params.useRowMatchFinder);
params.cParams.windowLog = windowLog;
params.useRowMatchFinder = cdict->useRowMatchFinder; /* cdict overrides */
FORWARD_IF_ERROR(ZSTD_resetCCtx_internal(cctx, &params, pledgedSrcSize,
/* loadedDictSize */ 0,
ZSTDcrp_makeClean, zbuff), "");
assert(cctx->appliedParams.cParams.strategy == adjusted_cdict_cParams.strategy);
}
{ const U32 cdictEnd = (U32)( cdict->matchState.window.nextSrc
- cdict->matchState.window.base);
const U32 cdictLen = cdictEnd - cdict->matchState.window.dictLimit;
if (cdictLen == 0) {
/* don't even attach dictionaries with no contents */
DEBUGLOG(4, "skipping attaching empty dictionary");
} else {
DEBUGLOG(4, "attaching dictionary into context");
cctx->blockState.matchState.dictMatchState = &cdict->matchState;
/* prep working match state so dict matches never have negative indices
* when they are translated to the working context's index space. */
if (cctx->blockState.matchState.window.dictLimit < cdictEnd) {
cctx->blockState.matchState.window.nextSrc =
cctx->blockState.matchState.window.base + cdictEnd;
ZSTD_window_clear(&cctx->blockState.matchState.window);
}
/* loadedDictEnd is expressed within the referential of the active context */
cctx->blockState.matchState.loadedDictEnd = cctx->blockState.matchState.window.dictLimit;
} }
cctx->dictID = cdict->dictID;
cctx->dictContentSize = cdict->dictContentSize;
/* copy block state */
ZSTD_memcpy(cctx->blockState.prevCBlock, &cdict->cBlockState, sizeof(cdict->cBlockState));
return 0;
}
static void ZSTD_copyCDictTableIntoCCtx(U32* dst, U32 const* src, size_t tableSize,
ZSTD_compressionParameters const* cParams) {
if (ZSTD_CDictIndicesAreTagged(cParams)){
/* Remove tags from the CDict table if they are present.
* See docs on "short cache" in zstd_compress_internal.h for context. */
size_t i;
for (i = 0; i < tableSize; i++) {
U32 const taggedIndex = src[i];
U32 const index = taggedIndex >> ZSTD_SHORT_CACHE_TAG_BITS;
dst[i] = index;
}
} else {
ZSTD_memcpy(dst, src, tableSize * sizeof(U32));
}
}
static size_t ZSTD_resetCCtx_byCopyingCDict(ZSTD_CCtx* cctx,
const ZSTD_CDict* cdict,
ZSTD_CCtx_params params,
U64 pledgedSrcSize,
ZSTD_buffered_policy_e zbuff)
{
const ZSTD_compressionParameters *cdict_cParams = &cdict->matchState.cParams;
assert(!cdict->matchState.dedicatedDictSearch);
DEBUGLOG(4, "ZSTD_resetCCtx_byCopyingCDict() pledgedSrcSize=%llu",
(unsigned long long)pledgedSrcSize);
{ unsigned const windowLog = params.cParams.windowLog;
assert(windowLog != 0);
/* Copy only compression parameters related to tables. */
params.cParams = *cdict_cParams;
params.cParams.windowLog = windowLog;
params.useRowMatchFinder = cdict->useRowMatchFinder;
FORWARD_IF_ERROR(ZSTD_resetCCtx_internal(cctx, &params, pledgedSrcSize,
/* loadedDictSize */ 0,
ZSTDcrp_leaveDirty, zbuff), "");
assert(cctx->appliedParams.cParams.strategy == cdict_cParams->strategy);
assert(cctx->appliedParams.cParams.hashLog == cdict_cParams->hashLog);
assert(cctx->appliedParams.cParams.chainLog == cdict_cParams->chainLog);
}
ZSTD_cwksp_mark_tables_dirty(&cctx->workspace);
assert(params.useRowMatchFinder != ZSTD_ps_auto);
/* copy tables */
{ size_t const chainSize = ZSTD_allocateChainTable(cdict_cParams->strategy, cdict->useRowMatchFinder, 0 /* DDS guaranteed disabled */)
? ((size_t)1 << cdict_cParams->chainLog)
: 0;
size_t const hSize = (size_t)1 << cdict_cParams->hashLog;
ZSTD_copyCDictTableIntoCCtx(cctx->blockState.matchState.hashTable,
cdict->matchState.hashTable,
hSize, cdict_cParams);
/* Do not copy cdict's chainTable if cctx has parameters such that it would not use chainTable */
if (ZSTD_allocateChainTable(cctx->appliedParams.cParams.strategy, cctx->appliedParams.useRowMatchFinder, 0 /* forDDSDict */)) {
ZSTD_copyCDictTableIntoCCtx(cctx->blockState.matchState.chainTable,
cdict->matchState.chainTable,
chainSize, cdict_cParams);
}
/* copy tag table */
if (ZSTD_rowMatchFinderUsed(cdict_cParams->strategy, cdict->useRowMatchFinder)) {
size_t const tagTableSize = hSize;
ZSTD_memcpy(cctx->blockState.matchState.tagTable,
cdict->matchState.tagTable,
tagTableSize);
cctx->blockState.matchState.hashSalt = cdict->matchState.hashSalt;
}
}
/* Zero the hashTable3, since the cdict never fills it */
{ int const h3log = cctx->blockState.matchState.hashLog3;
size_t const h3Size = h3log ? ((size_t)1 << h3log) : 0;
assert(cdict->matchState.hashLog3 == 0);
ZSTD_memset(cctx->blockState.matchState.hashTable3, 0, h3Size * sizeof(U32));
}
ZSTD_cwksp_mark_tables_clean(&cctx->workspace);
/* copy dictionary offsets */
{ ZSTD_matchState_t const* srcMatchState = &cdict->matchState;
ZSTD_matchState_t* dstMatchState = &cctx->blockState.matchState;
dstMatchState->window = srcMatchState->window;
dstMatchState->nextToUpdate = srcMatchState->nextToUpdate;
dstMatchState->loadedDictEnd= srcMatchState->loadedDictEnd;
}
cctx->dictID = cdict->dictID;
cctx->dictContentSize = cdict->dictContentSize;
/* copy block state */
ZSTD_memcpy(cctx->blockState.prevCBlock, &cdict->cBlockState, sizeof(cdict->cBlockState));
return 0;
}
/* We have a choice between copying the dictionary context into the working
* context, or referencing the dictionary context from the working context
* in-place. We decide here which strategy to use. */
static size_t ZSTD_resetCCtx_usingCDict(ZSTD_CCtx* cctx,
const ZSTD_CDict* cdict,
const ZSTD_CCtx_params* params,
U64 pledgedSrcSize,
ZSTD_buffered_policy_e zbuff)
{
DEBUGLOG(4, "ZSTD_resetCCtx_usingCDict (pledgedSrcSize=%u)",
(unsigned)pledgedSrcSize);
if (ZSTD_shouldAttachDict(cdict, params, pledgedSrcSize)) {
return ZSTD_resetCCtx_byAttachingCDict(
cctx, cdict, *params, pledgedSrcSize, zbuff);
} else {
return ZSTD_resetCCtx_byCopyingCDict(
cctx, cdict, *params, pledgedSrcSize, zbuff);
}
}
/*! ZSTD_copyCCtx_internal() :
* 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()).
* The "context", in this case, refers to the hash and chain tables,
* entropy tables, and dictionary references.
* `windowLog` value is enforced if != 0, otherwise value is copied from srcCCtx.
* @return : 0, or an error code */
static size_t ZSTD_copyCCtx_internal(ZSTD_CCtx* dstCCtx,
const ZSTD_CCtx* srcCCtx,
ZSTD_frameParameters fParams,
U64 pledgedSrcSize,
ZSTD_buffered_policy_e zbuff)
{
RETURN_ERROR_IF(srcCCtx->stage!=ZSTDcs_init, stage_wrong,
"Can't copy a ctx that's not in init stage.");
DEBUGLOG(5, "ZSTD_copyCCtx_internal");
ZSTD_memcpy(&dstCCtx->customMem, &srcCCtx->customMem, sizeof(ZSTD_customMem));
{ ZSTD_CCtx_params params = dstCCtx->requestedParams;
/* Copy only compression parameters related to tables. */
params.cParams = srcCCtx->appliedParams.cParams;
assert(srcCCtx->appliedParams.useRowMatchFinder != ZSTD_ps_auto);
assert(srcCCtx->appliedParams.useBlockSplitter != ZSTD_ps_auto);
assert(srcCCtx->appliedParams.ldmParams.enableLdm != ZSTD_ps_auto);
params.useRowMatchFinder = srcCCtx->appliedParams.useRowMatchFinder;
params.useBlockSplitter = srcCCtx->appliedParams.useBlockSplitter;
params.ldmParams = srcCCtx->appliedParams.ldmParams;
params.fParams = fParams;
params.maxBlockSize = srcCCtx->appliedParams.maxBlockSize;
ZSTD_resetCCtx_internal(dstCCtx, &params, pledgedSrcSize,
/* loadedDictSize */ 0,
ZSTDcrp_leaveDirty, zbuff);
assert(dstCCtx->appliedParams.cParams.windowLog == srcCCtx->appliedParams.cParams.windowLog);
assert(dstCCtx->appliedParams.cParams.strategy == srcCCtx->appliedParams.cParams.strategy);
assert(dstCCtx->appliedParams.cParams.hashLog == srcCCtx->appliedParams.cParams.hashLog);
assert(dstCCtx->appliedParams.cParams.chainLog == srcCCtx->appliedParams.cParams.chainLog);
assert(dstCCtx->blockState.matchState.hashLog3 == srcCCtx->blockState.matchState.hashLog3);
}
ZSTD_cwksp_mark_tables_dirty(&dstCCtx->workspace);
/* copy tables */
{ size_t const chainSize = ZSTD_allocateChainTable(srcCCtx->appliedParams.cParams.strategy,
srcCCtx->appliedParams.useRowMatchFinder,
0 /* forDDSDict */)
? ((size_t)1 << srcCCtx->appliedParams.cParams.chainLog)
: 0;
size_t const hSize = (size_t)1 << srcCCtx->appliedParams.cParams.hashLog;
int const h3log = srcCCtx->blockState.matchState.hashLog3;
size_t const h3Size = h3log ? ((size_t)1 << h3log) : 0;
ZSTD_memcpy(dstCCtx->blockState.matchState.hashTable,
srcCCtx->blockState.matchState.hashTable,
hSize * sizeof(U32));
ZSTD_memcpy(dstCCtx->blockState.matchState.chainTable,
srcCCtx->blockState.matchState.chainTable,
chainSize * sizeof(U32));
ZSTD_memcpy(dstCCtx->blockState.matchState.hashTable3,
srcCCtx->blockState.matchState.hashTable3,
h3Size * sizeof(U32));
}
ZSTD_cwksp_mark_tables_clean(&dstCCtx->workspace);
/* copy dictionary offsets */
{
const ZSTD_matchState_t* srcMatchState = &srcCCtx->blockState.matchState;
ZSTD_matchState_t* dstMatchState = &dstCCtx->blockState.matchState;
dstMatchState->window = srcMatchState->window;
dstMatchState->nextToUpdate = srcMatchState->nextToUpdate;
dstMatchState->loadedDictEnd= srcMatchState->loadedDictEnd;
}
dstCCtx->dictID = srcCCtx->dictID;
dstCCtx->dictContentSize = srcCCtx->dictContentSize;
/* copy block state */
ZSTD_memcpy(dstCCtx->blockState.prevCBlock, srcCCtx->blockState.prevCBlock, sizeof(*srcCCtx->blockState.prevCBlock));
return 0;
}
/*! 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()).
* pledgedSrcSize==0 means "unknown".
* @return : 0, or an error code */
size_t ZSTD_copyCCtx(ZSTD_CCtx* dstCCtx, const ZSTD_CCtx* srcCCtx, unsigned long long pledgedSrcSize)
{
ZSTD_frameParameters fParams = { 1 /*content*/, 0 /*checksum*/, 0 /*noDictID*/ };
ZSTD_buffered_policy_e const zbuff = srcCCtx->bufferedPolicy;
ZSTD_STATIC_ASSERT((U32)ZSTDb_buffered==1);
if (pledgedSrcSize==0) pledgedSrcSize = ZSTD_CONTENTSIZE_UNKNOWN;
fParams.contentSizeFlag = (pledgedSrcSize != ZSTD_CONTENTSIZE_UNKNOWN);
return ZSTD_copyCCtx_internal(dstCCtx, srcCCtx,
fParams, pledgedSrcSize,
zbuff);
}
#define ZSTD_ROWSIZE 16
/*! ZSTD_reduceTable() :
* reduce table indexes by `reducerValue`, or squash to zero.
* PreserveMark preserves "unsorted mark" for btlazy2 strategy.
* It must be set to a clear 0/1 value, to remove branch during inlining.
* Presume table size is a multiple of ZSTD_ROWSIZE
* to help auto-vectorization */
FORCE_INLINE_TEMPLATE void
ZSTD_reduceTable_internal (U32* const table, U32 const size, U32 const reducerValue, int const preserveMark)
{
int const nbRows = (int)size / ZSTD_ROWSIZE;
int cellNb = 0;
int rowNb;
/* Protect special index values < ZSTD_WINDOW_START_INDEX. */
U32 const reducerThreshold = reducerValue + ZSTD_WINDOW_START_INDEX;
assert((size & (ZSTD_ROWSIZE-1)) == 0); /* multiple of ZSTD_ROWSIZE */
assert(size < (1U<<31)); /* can be casted to int */
#if ZSTD_MEMORY_SANITIZER && !defined (ZSTD_MSAN_DONT_POISON_WORKSPACE)
/* To validate that the table reuse logic is sound, and that we don't
* access table space that we haven't cleaned, we re-"poison" the table
* space every time we mark it dirty.
*
* This function however is intended to operate on those dirty tables and
* re-clean them. So when this function is used correctly, we can unpoison
* the memory it operated on. This introduces a blind spot though, since
* if we now try to operate on __actually__ poisoned memory, we will not
* detect that. */
__msan_unpoison(table, size * sizeof(U32));
#endif
for (rowNb=0 ; rowNb < nbRows ; rowNb++) {
int column;
for (column=0; column<ZSTD_ROWSIZE; column++) {
U32 newVal;
if (preserveMark && table[cellNb] == ZSTD_DUBT_UNSORTED_MARK) {
/* This write is pointless, but is required(?) for the compiler
* to auto-vectorize the loop. */
newVal = ZSTD_DUBT_UNSORTED_MARK;
} else if (table[cellNb] < reducerThreshold) {
newVal = 0;
} else {
newVal = table[cellNb] - reducerValue;
}
table[cellNb] = newVal;
cellNb++;
} }
}
static void ZSTD_reduceTable(U32* const table, U32 const size, U32 const reducerValue)
{
ZSTD_reduceTable_internal(table, size, reducerValue, 0);
}
static void ZSTD_reduceTable_btlazy2(U32* const table, U32 const size, U32 const reducerValue)
{
ZSTD_reduceTable_internal(table, size, reducerValue, 1);
}
/*! ZSTD_reduceIndex() :
* rescale all indexes to avoid future overflow (indexes are U32) */
static void ZSTD_reduceIndex (ZSTD_matchState_t* ms, ZSTD_CCtx_params const* params, const U32 reducerValue)
{
{ U32 const hSize = (U32)1 << params->cParams.hashLog;
ZSTD_reduceTable(ms->hashTable, hSize, reducerValue);
}
if (ZSTD_allocateChainTable(params->cParams.strategy, params->useRowMatchFinder, (U32)ms->dedicatedDictSearch)) {
U32 const chainSize = (U32)1 << params->cParams.chainLog;
if (params->cParams.strategy == ZSTD_btlazy2)
ZSTD_reduceTable_btlazy2(ms->chainTable, chainSize, reducerValue);
else
ZSTD_reduceTable(ms->chainTable, chainSize, reducerValue);
}
if (ms->hashLog3) {
U32 const h3Size = (U32)1 << ms->hashLog3;
ZSTD_reduceTable(ms->hashTable3, h3Size, reducerValue);
}
}
/*-*******************************************************
* Block entropic compression
*********************************************************/
/* See doc/zstd_compression_format.md for detailed format description */
int ZSTD_seqToCodes(const seqStore_t* seqStorePtr)
{
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;
int longOffsets = 0;
assert(nbSeq <= seqStorePtr->maxNbSeq);
for (u=0; u<nbSeq; u++) {
U32 const llv = sequences[u].litLength;
U32 const ofCode = ZSTD_highbit32(sequences[u].offBase);
U32 const mlv = sequences[u].mlBase;
llCodeTable[u] = (BYTE)ZSTD_LLcode(llv);
ofCodeTable[u] = (BYTE)ofCode;
mlCodeTable[u] = (BYTE)ZSTD_MLcode(mlv);
assert(!(MEM_64bits() && ofCode >= STREAM_ACCUMULATOR_MIN));
if (MEM_32bits() && ofCode >= STREAM_ACCUMULATOR_MIN)
longOffsets = 1;
}
if (seqStorePtr->longLengthType==ZSTD_llt_literalLength)
llCodeTable[seqStorePtr->longLengthPos] = MaxLL;
if (seqStorePtr->longLengthType==ZSTD_llt_matchLength)
mlCodeTable[seqStorePtr->longLengthPos] = MaxML;
return longOffsets;
}
/* ZSTD_useTargetCBlockSize():
* Returns if target compressed block size param is being used.
* If used, compression will do best effort to make a compressed block size to be around targetCBlockSize.
* Returns 1 if true, 0 otherwise. */
static int ZSTD_useTargetCBlockSize(const ZSTD_CCtx_params* cctxParams)
{
DEBUGLOG(5, "ZSTD_useTargetCBlockSize (targetCBlockSize=%zu)", cctxParams->targetCBlockSize);
return (cctxParams->targetCBlockSize != 0);
}
/* ZSTD_blockSplitterEnabled():
* Returns if block splitting param is being used
* If used, compression will do best effort to split a block in order to improve compression ratio.
* At the time this function is called, the parameter must be finalized.
* Returns 1 if true, 0 otherwise. */
static int ZSTD_blockSplitterEnabled(ZSTD_CCtx_params* cctxParams)
{
DEBUGLOG(5, "ZSTD_blockSplitterEnabled (useBlockSplitter=%d)", cctxParams->useBlockSplitter);
assert(cctxParams->useBlockSplitter != ZSTD_ps_auto);
return (cctxParams->useBlockSplitter == ZSTD_ps_enable);
}
/* Type returned by ZSTD_buildSequencesStatistics containing finalized symbol encoding types
* and size of the sequences statistics
*/
typedef struct {
U32 LLtype;
U32 Offtype;
U32 MLtype;
size_t size;
size_t lastCountSize; /* Accounts for bug in 1.3.4. More detail in ZSTD_entropyCompressSeqStore_internal() */
int longOffsets;
} ZSTD_symbolEncodingTypeStats_t;
/* ZSTD_buildSequencesStatistics():
* Returns a ZSTD_symbolEncodingTypeStats_t, or a zstd error code in the `size` field.
* Modifies `nextEntropy` to have the appropriate values as a side effect.
* nbSeq must be greater than 0.
*
* entropyWkspSize must be of size at least ENTROPY_WORKSPACE_SIZE - (MaxSeq + 1)*sizeof(U32)
*/
static ZSTD_symbolEncodingTypeStats_t
ZSTD_buildSequencesStatistics(
const seqStore_t* seqStorePtr, size_t nbSeq,
const ZSTD_fseCTables_t* prevEntropy, ZSTD_fseCTables_t* nextEntropy,
BYTE* dst, const BYTE* const dstEnd,
ZSTD_strategy strategy, unsigned* countWorkspace,
void* entropyWorkspace, size_t entropyWkspSize)
{
BYTE* const ostart = dst;
const BYTE* const oend = dstEnd;
BYTE* op = ostart;
FSE_CTable* CTable_LitLength = nextEntropy->litlengthCTable;
FSE_CTable* CTable_OffsetBits = nextEntropy->offcodeCTable;
FSE_CTable* CTable_MatchLength = nextEntropy->matchlengthCTable;
const BYTE* const ofCodeTable = seqStorePtr->ofCode;
const BYTE* const llCodeTable = seqStorePtr->llCode;
const BYTE* const mlCodeTable = seqStorePtr->mlCode;
ZSTD_symbolEncodingTypeStats_t stats;
stats.lastCountSize = 0;
/* convert length/distances into codes */
stats.longOffsets = ZSTD_seqToCodes(seqStorePtr);
assert(op <= oend);
assert(nbSeq != 0); /* ZSTD_selectEncodingType() divides by nbSeq */
/* build CTable for Literal Lengths */
{ unsigned max = MaxLL;
size_t const mostFrequent = HIST_countFast_wksp(countWorkspace, &max, llCodeTable, nbSeq, entropyWorkspace, entropyWkspSize); /* can't fail */
DEBUGLOG(5, "Building LL table");
nextEntropy->litlength_repeatMode = prevEntropy->litlength_repeatMode;
stats.LLtype = ZSTD_selectEncodingType(&nextEntropy->litlength_repeatMode,
countWorkspace, max, mostFrequent, nbSeq,
LLFSELog, prevEntropy->litlengthCTable,
LL_defaultNorm, LL_defaultNormLog,
ZSTD_defaultAllowed, strategy);
assert(set_basic < set_compressed && set_rle < set_compressed);
assert(!(stats.LLtype < set_compressed && nextEntropy->litlength_repeatMode != FSE_repeat_none)); /* We don't copy tables */
{ size_t const countSize = ZSTD_buildCTable(
op, (size_t)(oend - op),
CTable_LitLength, LLFSELog, (symbolEncodingType_e)stats.LLtype,
countWorkspace, max, llCodeTable, nbSeq,
LL_defaultNorm, LL_defaultNormLog, MaxLL,
prevEntropy->litlengthCTable,
sizeof(prevEntropy->litlengthCTable),
entropyWorkspace, entropyWkspSize);
if (ZSTD_isError(countSize)) {
DEBUGLOG(3, "ZSTD_buildCTable for LitLens failed");
stats.size = countSize;
return stats;
}
if (stats.LLtype == set_compressed)
stats.lastCountSize = countSize;
op += countSize;
assert(op <= oend);
} }
/* build CTable for Offsets */
{ unsigned max = MaxOff;
size_t const mostFrequent = HIST_countFast_wksp(
countWorkspace, &max, ofCodeTable, nbSeq, entropyWorkspace, entropyWkspSize); /* can't fail */
/* We can only use the basic table if max <= DefaultMaxOff, otherwise the offsets are too large */
ZSTD_defaultPolicy_e const defaultPolicy = (max <= DefaultMaxOff) ? ZSTD_defaultAllowed : ZSTD_defaultDisallowed;
DEBUGLOG(5, "Building OF table");
nextEntropy->offcode_repeatMode = prevEntropy->offcode_repeatMode;
stats.Offtype = ZSTD_selectEncodingType(&nextEntropy->offcode_repeatMode,
countWorkspace, max, mostFrequent, nbSeq,
OffFSELog, prevEntropy->offcodeCTable,
OF_defaultNorm, OF_defaultNormLog,
defaultPolicy, strategy);
assert(!(stats.Offtype < set_compressed && nextEntropy->offcode_repeatMode != FSE_repeat_none)); /* We don't copy tables */
{ size_t const countSize = ZSTD_buildCTable(
op, (size_t)(oend - op),
CTable_OffsetBits, OffFSELog, (symbolEncodingType_e)stats.Offtype,
countWorkspace, max, ofCodeTable, nbSeq,
OF_defaultNorm, OF_defaultNormLog, DefaultMaxOff,
prevEntropy->offcodeCTable,
sizeof(prevEntropy->offcodeCTable),
entropyWorkspace, entropyWkspSize);
if (ZSTD_isError(countSize)) {
DEBUGLOG(3, "ZSTD_buildCTable for Offsets failed");
stats.size = countSize;
return stats;
}
if (stats.Offtype == set_compressed)
stats.lastCountSize = countSize;
op += countSize;
assert(op <= oend);
} }
/* build CTable for MatchLengths */
{ unsigned max = MaxML;
size_t const mostFrequent = HIST_countFast_wksp(
countWorkspace, &max, mlCodeTable, nbSeq, entropyWorkspace, entropyWkspSize); /* can't fail */
DEBUGLOG(5, "Building ML table (remaining space : %i)", (int)(oend-op));
nextEntropy->matchlength_repeatMode = prevEntropy->matchlength_repeatMode;
stats.MLtype = ZSTD_selectEncodingType(&nextEntropy->matchlength_repeatMode,
countWorkspace, max, mostFrequent, nbSeq,
MLFSELog, prevEntropy->matchlengthCTable,
ML_defaultNorm, ML_defaultNormLog,
ZSTD_defaultAllowed, strategy);
assert(!(stats.MLtype < set_compressed && nextEntropy->matchlength_repeatMode != FSE_repeat_none)); /* We don't copy tables */
{ size_t const countSize = ZSTD_buildCTable(
op, (size_t)(oend - op),
CTable_MatchLength, MLFSELog, (symbolEncodingType_e)stats.MLtype,
countWorkspace, max, mlCodeTable, nbSeq,
ML_defaultNorm, ML_defaultNormLog, MaxML,
prevEntropy->matchlengthCTable,
sizeof(prevEntropy->matchlengthCTable),
entropyWorkspace, entropyWkspSize);
if (ZSTD_isError(countSize)) {
DEBUGLOG(3, "ZSTD_buildCTable for MatchLengths failed");
stats.size = countSize;
return stats;
}
if (stats.MLtype == set_compressed)
stats.lastCountSize = countSize;
op += countSize;
assert(op <= oend);
} }
stats.size = (size_t)(op-ostart);
return stats;
}
/* ZSTD_entropyCompressSeqStore_internal():
* compresses both literals and sequences
* Returns compressed size of block, or a zstd error.
*/
#define SUSPECT_UNCOMPRESSIBLE_LITERAL_RATIO 20
MEM_STATIC size_t
ZSTD_entropyCompressSeqStore_internal(
const seqStore_t* seqStorePtr,
const ZSTD_entropyCTables_t* prevEntropy,
ZSTD_entropyCTables_t* nextEntropy,
const ZSTD_CCtx_params* cctxParams,
void* dst, size_t dstCapacity,
void* entropyWorkspace, size_t entropyWkspSize,
const int bmi2)
{
ZSTD_strategy const strategy = cctxParams->cParams.strategy;
unsigned* count = (unsigned*)entropyWorkspace;
FSE_CTable* CTable_LitLength = nextEntropy->fse.litlengthCTable;
FSE_CTable* CTable_OffsetBits = nextEntropy->fse.offcodeCTable;
FSE_CTable* CTable_MatchLength = nextEntropy->fse.matchlengthCTable;
const seqDef* const sequences = seqStorePtr->sequencesStart;
const size_t nbSeq = (size_t)(seqStorePtr->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 lastCountSize;
int longOffsets = 0;
entropyWorkspace = count + (MaxSeq + 1);
entropyWkspSize -= (MaxSeq + 1) * sizeof(*count);
DEBUGLOG(5, "ZSTD_entropyCompressSeqStore_internal (nbSeq=%zu, dstCapacity=%zu)", nbSeq, dstCapacity);
ZSTD_STATIC_ASSERT(HUF_WORKSPACE_SIZE >= (1<<MAX(MLFSELog,LLFSELog)));
assert(entropyWkspSize >= HUF_WORKSPACE_SIZE);
/* Compress literals */
{ const BYTE* const literals = seqStorePtr->litStart;
size_t const numSequences = (size_t)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
size_t const numLiterals = (size_t)(seqStorePtr->lit - seqStorePtr->litStart);
/* Base suspicion of uncompressibility on ratio of literals to sequences */
unsigned const suspectUncompressible = (numSequences == 0) || (numLiterals / numSequences >= SUSPECT_UNCOMPRESSIBLE_LITERAL_RATIO);
size_t const litSize = (size_t)(seqStorePtr->lit - literals);
size_t const cSize = ZSTD_compressLiterals(
op, dstCapacity,
literals, litSize,
entropyWorkspace, entropyWkspSize,
&prevEntropy->huf, &nextEntropy->huf,
cctxParams->cParams.strategy,
ZSTD_literalsCompressionIsDisabled(cctxParams),
suspectUncompressible, bmi2);
FORWARD_IF_ERROR(cSize, "ZSTD_compressLiterals failed");
assert(cSize <= dstCapacity);
op += cSize;
}
/* Sequences Header */
RETURN_ERROR_IF((oend-op) < 3 /*max nbSeq Size*/ + 1 /*seqHead*/,
dstSize_tooSmall, "Can't fit seq hdr in output buf!");
if (nbSeq < 128) {
*op++ = (BYTE)nbSeq;
} else if (nbSeq < LONGNBSEQ) {
op[0] = (BYTE)((nbSeq>>8) + 0x80);
op[1] = (BYTE)nbSeq;
op+=2;
} else {
op[0]=0xFF;
MEM_writeLE16(op+1, (U16)(nbSeq - LONGNBSEQ));
op+=3;
}
assert(op <= oend);
if (nbSeq==0) {
/* Copy the old tables over as if we repeated them */
ZSTD_memcpy(&nextEntropy->fse, &prevEntropy->fse, sizeof(prevEntropy->fse));
return (size_t)(op - ostart);
}
{ BYTE* const seqHead = op++;
/* build stats for sequences */
const ZSTD_symbolEncodingTypeStats_t stats =
ZSTD_buildSequencesStatistics(seqStorePtr, nbSeq,
&prevEntropy->fse, &nextEntropy->fse,
op, oend,
strategy, count,
entropyWorkspace, entropyWkspSize);
FORWARD_IF_ERROR(stats.size, "ZSTD_buildSequencesStatistics failed!");
*seqHead = (BYTE)((stats.LLtype<<6) + (stats.Offtype<<4) + (stats.MLtype<<2));
lastCountSize = stats.lastCountSize;
op += stats.size;
longOffsets = stats.longOffsets;
}
{ size_t const bitstreamSize = ZSTD_encodeSequences(
op, (size_t)(oend - op),
CTable_MatchLength, mlCodeTable,
CTable_OffsetBits, ofCodeTable,
CTable_LitLength, llCodeTable,
sequences, nbSeq,
longOffsets, bmi2);
FORWARD_IF_ERROR(bitstreamSize, "ZSTD_encodeSequences failed");
op += bitstreamSize;
assert(op <= oend);
/* zstd versions <= 1.3.4 mistakenly report corruption when
* FSE_readNCount() receives a buffer < 4 bytes.
* Fixed by https://github.com/facebook/zstd/pull/1146.
* This can happen when the last set_compressed table present is 2
* bytes and the bitstream is only one byte.
* In this exceedingly rare case, we will simply emit an uncompressed
* block, since it isn't worth optimizing.
*/
if (lastCountSize && (lastCountSize + bitstreamSize) < 4) {
/* lastCountSize >= 2 && bitstreamSize > 0 ==> lastCountSize == 3 */
assert(lastCountSize + bitstreamSize == 3);
DEBUGLOG(5, "Avoiding bug in zstd decoder in versions <= 1.3.4 by "
"emitting an uncompressed block.");
return 0;
}
}
DEBUGLOG(5, "compressed block size : %u", (unsigned)(op - ostart));
return (size_t)(op - ostart);
}
MEM_STATIC size_t
ZSTD_entropyCompressSeqStore(
const seqStore_t* seqStorePtr,
const ZSTD_entropyCTables_t* prevEntropy,
ZSTD_entropyCTables_t* nextEntropy,
const ZSTD_CCtx_params* cctxParams,
void* dst, size_t dstCapacity,
size_t srcSize,
void* entropyWorkspace, size_t entropyWkspSize,
int bmi2)
{
size_t const cSize = ZSTD_entropyCompressSeqStore_internal(
seqStorePtr, prevEntropy, nextEntropy, cctxParams,
dst, dstCapacity,
entropyWorkspace, entropyWkspSize, bmi2);
if (cSize == 0) return 0;
/* When srcSize <= dstCapacity, there is enough space to write a raw uncompressed block.
* Since we ran out of space, block must be not compressible, so fall back to raw uncompressed block.
*/
if ((cSize == ERROR(dstSize_tooSmall)) & (srcSize <= dstCapacity)) {
DEBUGLOG(4, "not enough dstCapacity (%zu) for ZSTD_entropyCompressSeqStore_internal()=> do not compress block", dstCapacity);
return 0; /* block not compressed */
}
FORWARD_IF_ERROR(cSize, "ZSTD_entropyCompressSeqStore_internal failed");
/* Check compressibility */
{ size_t const maxCSize = srcSize - ZSTD_minGain(srcSize, cctxParams->cParams.strategy);
if (cSize >= maxCSize) return 0; /* block not compressed */
}
DEBUGLOG(5, "ZSTD_entropyCompressSeqStore() cSize: %zu", cSize);
/* libzstd decoder before > v1.5.4 is not compatible with compressed blocks of size ZSTD_BLOCKSIZE_MAX exactly.
* This restriction is indirectly already fulfilled by respecting ZSTD_minGain() condition above.
*/
assert(cSize < ZSTD_BLOCKSIZE_MAX);
return cSize;
}
/* ZSTD_selectBlockCompressor() :
* Not static, but internal use only (used by long distance matcher)
* assumption : strat is a valid strategy */
ZSTD_blockCompressor ZSTD_selectBlockCompressor(ZSTD_strategy strat, ZSTD_paramSwitch_e useRowMatchFinder, ZSTD_dictMode_e dictMode)
{
static const ZSTD_blockCompressor blockCompressor[4][ZSTD_STRATEGY_MAX+1] = {
{ ZSTD_compressBlock_fast /* default for 0 */,
ZSTD_compressBlock_fast,
ZSTD_COMPRESSBLOCK_DOUBLEFAST,
ZSTD_COMPRESSBLOCK_GREEDY,
ZSTD_COMPRESSBLOCK_LAZY,
ZSTD_COMPRESSBLOCK_LAZY2,
ZSTD_COMPRESSBLOCK_BTLAZY2,
ZSTD_COMPRESSBLOCK_BTOPT,
ZSTD_COMPRESSBLOCK_BTULTRA,
ZSTD_COMPRESSBLOCK_BTULTRA2
},
{ ZSTD_compressBlock_fast_extDict /* default for 0 */,
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_BTULTRA_EXTDICT,
ZSTD_COMPRESSBLOCK_BTULTRA_EXTDICT
},
{ ZSTD_compressBlock_fast_dictMatchState /* default for 0 */,
ZSTD_compressBlock_fast_dictMatchState,
ZSTD_COMPRESSBLOCK_DOUBLEFAST_DICTMATCHSTATE,
ZSTD_COMPRESSBLOCK_GREEDY_DICTMATCHSTATE,
ZSTD_COMPRESSBLOCK_LAZY_DICTMATCHSTATE,
ZSTD_COMPRESSBLOCK_LAZY2_DICTMATCHSTATE,
ZSTD_COMPRESSBLOCK_BTLAZY2_DICTMATCHSTATE,
ZSTD_COMPRESSBLOCK_BTOPT_DICTMATCHSTATE,
ZSTD_COMPRESSBLOCK_BTULTRA_DICTMATCHSTATE,
ZSTD_COMPRESSBLOCK_BTULTRA_DICTMATCHSTATE
},
{ NULL /* default for 0 */,
NULL,
NULL,
ZSTD_COMPRESSBLOCK_GREEDY_DEDICATEDDICTSEARCH,
ZSTD_COMPRESSBLOCK_LAZY_DEDICATEDDICTSEARCH,
ZSTD_COMPRESSBLOCK_LAZY2_DEDICATEDDICTSEARCH,
NULL,
NULL,
NULL,
NULL }
};
ZSTD_blockCompressor selectedCompressor;
ZSTD_STATIC_ASSERT((unsigned)ZSTD_fast == 1);
assert(ZSTD_cParam_withinBounds(ZSTD_c_strategy, strat));
DEBUGLOG(4, "Selected block compressor: dictMode=%d strat=%d rowMatchfinder=%d", (int)dictMode, (int)strat, (int)useRowMatchFinder);
if (ZSTD_rowMatchFinderUsed(strat, useRowMatchFinder)) {
static const ZSTD_blockCompressor rowBasedBlockCompressors[4][3] = {
{
ZSTD_COMPRESSBLOCK_GREEDY_ROW,
ZSTD_COMPRESSBLOCK_LAZY_ROW,
ZSTD_COMPRESSBLOCK_LAZY2_ROW
},
{
ZSTD_COMPRESSBLOCK_GREEDY_EXTDICT_ROW,
ZSTD_COMPRESSBLOCK_LAZY_EXTDICT_ROW,
ZSTD_COMPRESSBLOCK_LAZY2_EXTDICT_ROW
},
{
ZSTD_COMPRESSBLOCK_GREEDY_DICTMATCHSTATE_ROW,
ZSTD_COMPRESSBLOCK_LAZY_DICTMATCHSTATE_ROW,
ZSTD_COMPRESSBLOCK_LAZY2_DICTMATCHSTATE_ROW
},
{
ZSTD_COMPRESSBLOCK_GREEDY_DEDICATEDDICTSEARCH_ROW,
ZSTD_COMPRESSBLOCK_LAZY_DEDICATEDDICTSEARCH_ROW,
ZSTD_COMPRESSBLOCK_LAZY2_DEDICATEDDICTSEARCH_ROW
}
};
DEBUGLOG(4, "Selecting a row-based matchfinder");
assert(useRowMatchFinder != ZSTD_ps_auto);
selectedCompressor = rowBasedBlockCompressors[(int)dictMode][(int)strat - (int)ZSTD_greedy];
} else {
selectedCompressor = blockCompressor[(int)dictMode][(int)strat];
}
assert(selectedCompressor != NULL);
return selectedCompressor;
}
static void ZSTD_storeLastLiterals(seqStore_t* seqStorePtr,
const BYTE* anchor, size_t lastLLSize)
{
ZSTD_memcpy(seqStorePtr->lit, anchor, lastLLSize);
seqStorePtr->lit += lastLLSize;
}
void ZSTD_resetSeqStore(seqStore_t* ssPtr)
{
ssPtr->lit = ssPtr->litStart;
ssPtr->sequences = ssPtr->sequencesStart;
ssPtr->longLengthType = ZSTD_llt_none;
}
/* ZSTD_postProcessSequenceProducerResult() :
* Validates and post-processes sequences obtained through the external matchfinder API:
* - Checks whether nbExternalSeqs represents an error condition.
* - Appends a block delimiter to outSeqs if one is not already present.
* See zstd.h for context regarding block delimiters.
* Returns the number of sequences after post-processing, or an error code. */
static size_t ZSTD_postProcessSequenceProducerResult(
ZSTD_Sequence* outSeqs, size_t nbExternalSeqs, size_t outSeqsCapacity, size_t srcSize
) {
RETURN_ERROR_IF(
nbExternalSeqs > outSeqsCapacity,
sequenceProducer_failed,
"External sequence producer returned error code %lu",
(unsigned long)nbExternalSeqs
);
RETURN_ERROR_IF(
nbExternalSeqs == 0 && srcSize > 0,
sequenceProducer_failed,
"Got zero sequences from external sequence producer for a non-empty src buffer!"
);
if (srcSize == 0) {
ZSTD_memset(&outSeqs[0], 0, sizeof(ZSTD_Sequence));
return 1;
}
{
ZSTD_Sequence const lastSeq = outSeqs[nbExternalSeqs - 1];
/* We can return early if lastSeq is already a block delimiter. */
if (lastSeq.offset == 0 && lastSeq.matchLength == 0) {
return nbExternalSeqs;
}
/* This error condition is only possible if the external matchfinder
* produced an invalid parse, by definition of ZSTD_sequenceBound(). */
RETURN_ERROR_IF(
nbExternalSeqs == outSeqsCapacity,
sequenceProducer_failed,
"nbExternalSeqs == outSeqsCapacity but lastSeq is not a block delimiter!"
);
/* lastSeq is not a block delimiter, so we need to append one. */
ZSTD_memset(&outSeqs[nbExternalSeqs], 0, sizeof(ZSTD_Sequence));
return nbExternalSeqs + 1;
}
}
/* ZSTD_fastSequenceLengthSum() :
* Returns sum(litLen) + sum(matchLen) + lastLits for *seqBuf*.
* Similar to another function in zstd_compress.c (determine_blockSize),
* except it doesn't check for a block delimiter to end summation.
* Removing the early exit allows the compiler to auto-vectorize (https://godbolt.org/z/cY1cajz9P).
* This function can be deleted and replaced by determine_blockSize after we resolve issue #3456. */
static size_t ZSTD_fastSequenceLengthSum(ZSTD_Sequence const* seqBuf, size_t seqBufSize) {
size_t matchLenSum, litLenSum, i;
matchLenSum = 0;
litLenSum = 0;
for (i = 0; i < seqBufSize; i++) {
litLenSum += seqBuf[i].litLength;
matchLenSum += seqBuf[i].matchLength;
}
return litLenSum + matchLenSum;
}
typedef enum { ZSTDbss_compress, ZSTDbss_noCompress } ZSTD_buildSeqStore_e;
static size_t ZSTD_buildSeqStore(ZSTD_CCtx* zc, const void* src, size_t srcSize)
{
ZSTD_matchState_t* const ms = &zc->blockState.matchState;
DEBUGLOG(5, "ZSTD_buildSeqStore (srcSize=%zu)", srcSize);
assert(srcSize <= ZSTD_BLOCKSIZE_MAX);
/* Assert that we have correctly flushed the ctx params into the ms's copy */
ZSTD_assertEqualCParams(zc->appliedParams.cParams, ms->cParams);
/* TODO: See 3090. We reduced MIN_CBLOCK_SIZE from 3 to 2 so to compensate we are adding
* additional 1. We need to revisit and change this logic to be more consistent */
if (srcSize < MIN_CBLOCK_SIZE+ZSTD_blockHeaderSize+1+1) {
if (zc->appliedParams.cParams.strategy >= ZSTD_btopt) {
ZSTD_ldm_skipRawSeqStoreBytes(&zc->externSeqStore, srcSize);
} else {
ZSTD_ldm_skipSequences(&zc->externSeqStore, srcSize, zc->appliedParams.cParams.minMatch);
}
return ZSTDbss_noCompress; /* don't even attempt compression below a certain srcSize */
}
ZSTD_resetSeqStore(&(zc->seqStore));
/* required for optimal parser to read stats from dictionary */
ms->opt.symbolCosts = &zc->blockState.prevCBlock->entropy;
/* tell the optimal parser how we expect to compress literals */
ms->opt.literalCompressionMode = zc->appliedParams.literalCompressionMode;
/* a gap between an attached dict and the current window is not safe,
* they must remain adjacent,
* and when that stops being the case, the dict must be unset */
assert(ms->dictMatchState == NULL || ms->loadedDictEnd == ms->window.dictLimit);
/* limited update after a very long match */
{ const BYTE* const base = ms->window.base;
const BYTE* const istart = (const BYTE*)src;
const U32 curr = (U32)(istart-base);
if (sizeof(ptrdiff_t)==8) assert(istart - base < (ptrdiff_t)(U32)(-1)); /* ensure no overflow */
if (curr > ms->nextToUpdate + 384)
ms->nextToUpdate = curr - MIN(192, (U32)(curr - ms->nextToUpdate - 384));
}
/* select and store sequences */
{ ZSTD_dictMode_e const dictMode = ZSTD_matchState_dictMode(ms);
size_t lastLLSize;
{ int i;
for (i = 0; i < ZSTD_REP_NUM; ++i)
zc->blockState.nextCBlock->rep[i] = zc->blockState.prevCBlock->rep[i];
}
if (zc->externSeqStore.pos < zc->externSeqStore.size) {
assert(zc->appliedParams.ldmParams.enableLdm == ZSTD_ps_disable);
/* External matchfinder + LDM is technically possible, just not implemented yet.
* We need to revisit soon and implement it. */
RETURN_ERROR_IF(
ZSTD_hasExtSeqProd(&zc->appliedParams),
parameter_combination_unsupported,
"Long-distance matching with external sequence producer enabled is not currently supported."
);
/* Updates ldmSeqStore.pos */
lastLLSize =
ZSTD_ldm_blockCompress(&zc->externSeqStore,
ms, &zc->seqStore,
zc->blockState.nextCBlock->rep,
zc->appliedParams.useRowMatchFinder,
src, srcSize);
assert(zc->externSeqStore.pos <= zc->externSeqStore.size);
} else if (zc->appliedParams.ldmParams.enableLdm == ZSTD_ps_enable) {
rawSeqStore_t ldmSeqStore = kNullRawSeqStore;
/* External matchfinder + LDM is technically possible, just not implemented yet.
* We need to revisit soon and implement it. */
RETURN_ERROR_IF(
ZSTD_hasExtSeqProd(&zc->appliedParams),
parameter_combination_unsupported,
"Long-distance matching with external sequence producer enabled is not currently supported."
);
ldmSeqStore.seq = zc->ldmSequences;
ldmSeqStore.capacity = zc->maxNbLdmSequences;
/* Updates ldmSeqStore.size */
FORWARD_IF_ERROR(ZSTD_ldm_generateSequences(&zc->ldmState, &ldmSeqStore,
&zc->appliedParams.ldmParams,
src, srcSize), "");
/* Updates ldmSeqStore.pos */
lastLLSize =
ZSTD_ldm_blockCompress(&ldmSeqStore,
ms, &zc->seqStore,
zc->blockState.nextCBlock->rep,
zc->appliedParams.useRowMatchFinder,
src, srcSize);
assert(ldmSeqStore.pos == ldmSeqStore.size);
} else if (ZSTD_hasExtSeqProd(&zc->appliedParams)) {
assert(
zc->extSeqBufCapacity >= ZSTD_sequenceBound(srcSize)
);
assert(zc->appliedParams.extSeqProdFunc != NULL);
{ U32 const windowSize = (U32)1 << zc->appliedParams.cParams.windowLog;
size_t const nbExternalSeqs = (zc->appliedParams.extSeqProdFunc)(
zc->appliedParams.extSeqProdState,
zc->extSeqBuf,
zc->extSeqBufCapacity,
src, srcSize,
NULL, 0, /* dict and dictSize, currently not supported */
zc->appliedParams.compressionLevel,
windowSize
);
size_t const nbPostProcessedSeqs = ZSTD_postProcessSequenceProducerResult(
zc->extSeqBuf,
nbExternalSeqs,
zc->extSeqBufCapacity,
srcSize
);
/* Return early if there is no error, since we don't need to worry about last literals */
if (!ZSTD_isError(nbPostProcessedSeqs)) {
ZSTD_sequencePosition seqPos = {0,0,0};
size_t const seqLenSum = ZSTD_fastSequenceLengthSum(zc->extSeqBuf, nbPostProcessedSeqs);
RETURN_ERROR_IF(seqLenSum > srcSize, externalSequences_invalid, "External sequences imply too large a block!");
FORWARD_IF_ERROR(
ZSTD_copySequencesToSeqStoreExplicitBlockDelim(
zc, &seqPos,
zc->extSeqBuf, nbPostProcessedSeqs,
src, srcSize,
zc->appliedParams.searchForExternalRepcodes
),
"Failed to copy external sequences to seqStore!"
);
ms->ldmSeqStore = NULL;
DEBUGLOG(5, "Copied %lu sequences from external sequence producer to internal seqStore.", (unsigned long)nbExternalSeqs);
return ZSTDbss_compress;
}
/* Propagate the error if fallback is disabled */
if (!zc->appliedParams.enableMatchFinderFallback) {
return nbPostProcessedSeqs;
}
/* Fallback to software matchfinder */
{ ZSTD_blockCompressor const blockCompressor =
ZSTD_selectBlockCompressor(
zc->appliedParams.cParams.strategy,
zc->appliedParams.useRowMatchFinder,
dictMode);
ms->ldmSeqStore = NULL;
DEBUGLOG(
5,
"External sequence producer returned error code %lu. Falling back to internal parser.",
(unsigned long)nbExternalSeqs
);
lastLLSize = blockCompressor(ms, &zc->seqStore, zc->blockState.nextCBlock->rep, src, srcSize);
} }
} else { /* not long range mode and no external matchfinder */
ZSTD_blockCompressor const blockCompressor = ZSTD_selectBlockCompressor(
zc->appliedParams.cParams.strategy,
zc->appliedParams.useRowMatchFinder,
dictMode);
ms->ldmSeqStore = NULL;
lastLLSize = blockCompressor(ms, &zc->seqStore, zc->blockState.nextCBlock->rep, src, srcSize);
}
{ const BYTE* const lastLiterals = (const BYTE*)src + srcSize - lastLLSize;
ZSTD_storeLastLiterals(&zc->seqStore, lastLiterals, lastLLSize);
} }
return ZSTDbss_compress;
}
static size_t ZSTD_copyBlockSequences(SeqCollector* seqCollector, const seqStore_t* seqStore, const U32 prevRepcodes[ZSTD_REP_NUM])
{
const seqDef* inSeqs = seqStore->sequencesStart;
const size_t nbInSequences = seqStore->sequences - inSeqs;
const size_t nbInLiterals = (size_t)(seqStore->lit - seqStore->litStart);
ZSTD_Sequence* outSeqs = seqCollector->seqIndex == 0 ? seqCollector->seqStart : seqCollector->seqStart + seqCollector->seqIndex;
const size_t nbOutSequences = nbInSequences + 1;
size_t nbOutLiterals = 0;
repcodes_t repcodes;
size_t i;
/* Bounds check that we have enough space for every input sequence
* and the block delimiter
*/
assert(seqCollector->seqIndex <= seqCollector->maxSequences);
RETURN_ERROR_IF(
nbOutSequences > (size_t)(seqCollector->maxSequences - seqCollector->seqIndex),
dstSize_tooSmall,
"Not enough space to copy sequences");
ZSTD_memcpy(&repcodes, prevRepcodes, sizeof(repcodes));
for (i = 0; i < nbInSequences; ++i) {
U32 rawOffset;
outSeqs[i].litLength = inSeqs[i].litLength;
outSeqs[i].matchLength = inSeqs[i].mlBase + MINMATCH;
outSeqs[i].rep = 0;
/* Handle the possible single length >= 64K
* There can only be one because we add MINMATCH to every match length,
* and blocks are at most 128K.
*/
if (i == seqStore->longLengthPos) {
if (seqStore->longLengthType == ZSTD_llt_literalLength) {
outSeqs[i].litLength += 0x10000;
} else if (seqStore->longLengthType == ZSTD_llt_matchLength) {
outSeqs[i].matchLength += 0x10000;
}
}
/* Determine the raw offset given the offBase, which may be a repcode. */
if (OFFBASE_IS_REPCODE(inSeqs[i].offBase)) {
const U32 repcode = OFFBASE_TO_REPCODE(inSeqs[i].offBase);
assert(repcode > 0);
outSeqs[i].rep = repcode;
if (outSeqs[i].litLength != 0) {
rawOffset = repcodes.rep[repcode - 1];
} else {
if (repcode == 3) {
assert(repcodes.rep[0] > 1);
rawOffset = repcodes.rep[0] - 1;
} else {
rawOffset = repcodes.rep[repcode];
}
}
} else {
rawOffset = OFFBASE_TO_OFFSET(inSeqs[i].offBase);
}
outSeqs[i].offset = rawOffset;
/* Update repcode history for the sequence */
ZSTD_updateRep(repcodes.rep,
inSeqs[i].offBase,
inSeqs[i].litLength == 0);
nbOutLiterals += outSeqs[i].litLength;
}
/* Insert last literals (if any exist) in the block as a sequence with ml == off == 0.
* If there are no last literals, then we'll emit (of: 0, ml: 0, ll: 0), which is a marker
* for the block boundary, according to the API.
*/
assert(nbInLiterals >= nbOutLiterals);
{
const size_t lastLLSize = nbInLiterals - nbOutLiterals;
outSeqs[nbInSequences].litLength = (U32)lastLLSize;
outSeqs[nbInSequences].matchLength = 0;
outSeqs[nbInSequences].offset = 0;
assert(nbOutSequences == nbInSequences + 1);
}
seqCollector->seqIndex += nbOutSequences;
assert(seqCollector->seqIndex <= seqCollector->maxSequences);
return 0;
}
size_t ZSTD_sequenceBound(size_t srcSize) {
const size_t maxNbSeq = (srcSize / ZSTD_MINMATCH_MIN) + 1;
const size_t maxNbDelims = (srcSize / ZSTD_BLOCKSIZE_MAX_MIN) + 1;
return maxNbSeq + maxNbDelims;
}
size_t ZSTD_generateSequences(ZSTD_CCtx* zc, ZSTD_Sequence* outSeqs,
size_t outSeqsSize, const void* src, size_t srcSize)
{
const size_t dstCapacity = ZSTD_compressBound(srcSize);
void* dst = ZSTD_customMalloc(dstCapacity, ZSTD_defaultCMem);
SeqCollector seqCollector;
{
int targetCBlockSize;
FORWARD_IF_ERROR(ZSTD_CCtx_getParameter(zc, ZSTD_c_targetCBlockSize, &targetCBlockSize), "");
RETURN_ERROR_IF(targetCBlockSize != 0, parameter_unsupported, "targetCBlockSize != 0");
}
{
int nbWorkers;
FORWARD_IF_ERROR(ZSTD_CCtx_getParameter(zc, ZSTD_c_nbWorkers, &nbWorkers), "");
RETURN_ERROR_IF(nbWorkers != 0, parameter_unsupported, "nbWorkers != 0");
}
RETURN_ERROR_IF(dst == NULL, memory_allocation, "NULL pointer!");
seqCollector.collectSequences = 1;
seqCollector.seqStart = outSeqs;
seqCollector.seqIndex = 0;
seqCollector.maxSequences = outSeqsSize;
zc->seqCollector = seqCollector;
{
const size_t ret = ZSTD_compress2(zc, dst, dstCapacity, src, srcSize);
ZSTD_customFree(dst, ZSTD_defaultCMem);
FORWARD_IF_ERROR(ret, "ZSTD_compress2 failed");
}
assert(zc->seqCollector.seqIndex <= ZSTD_sequenceBound(srcSize));
return zc->seqCollector.seqIndex;
}
size_t ZSTD_mergeBlockDelimiters(ZSTD_Sequence* sequences, size_t seqsSize) {
size_t in = 0;
size_t out = 0;
for (; in < seqsSize; ++in) {
if (sequences[in].offset == 0 && sequences[in].matchLength == 0) {
if (in != seqsSize - 1) {
sequences[in+1].litLength += sequences[in].litLength;
}
} else {
sequences[out] = sequences[in];
++out;
}
}
return out;
}
/* Unrolled loop to read four size_ts of input at a time. Returns 1 if is RLE, 0 if not. */
static int ZSTD_isRLE(const BYTE* src, size_t length) {
const BYTE* ip = src;
const BYTE value = ip[0];
const size_t valueST = (size_t)((U64)value * 0x0101010101010101ULL);
const size_t unrollSize = sizeof(size_t) * 4;
const size_t unrollMask = unrollSize - 1;
const size_t prefixLength = length & unrollMask;
size_t i;
if (length == 1) return 1;
/* Check if prefix is RLE first before using unrolled loop */
if (prefixLength && ZSTD_count(ip+1, ip, ip+prefixLength) != prefixLength-1) {
return 0;
}
for (i = prefixLength; i != length; i += unrollSize) {
size_t u;
for (u = 0; u < unrollSize; u += sizeof(size_t)) {
if (MEM_readST(ip + i + u) != valueST) {
return 0;
} } }
return 1;
}
/* Returns true if the given block may be RLE.
* This is just a heuristic based on the compressibility.
* It may return both false positives and false negatives.
*/
static int ZSTD_maybeRLE(seqStore_t const* seqStore)
{
size_t const nbSeqs = (size_t)(seqStore->sequences - seqStore->sequencesStart);
size_t const nbLits = (size_t)(seqStore->lit - seqStore->litStart);
return nbSeqs < 4 && nbLits < 10;
}
static void
ZSTD_blockState_confirmRepcodesAndEntropyTables(ZSTD_blockState_t* const bs)
{
ZSTD_compressedBlockState_t* const tmp = bs->prevCBlock;
bs->prevCBlock = bs->nextCBlock;
bs->nextCBlock = tmp;
}
/* Writes the block header */
static void
writeBlockHeader(void* op, size_t cSize, size_t blockSize, U32 lastBlock)
{
U32 const cBlockHeader = cSize == 1 ?
lastBlock + (((U32)bt_rle)<<1) + (U32)(blockSize << 3) :
lastBlock + (((U32)bt_compressed)<<1) + (U32)(cSize << 3);
MEM_writeLE24(op, cBlockHeader);
DEBUGLOG(3, "writeBlockHeader: cSize: %zu blockSize: %zu lastBlock: %u", cSize, blockSize, lastBlock);
}
/** ZSTD_buildBlockEntropyStats_literals() :
* Builds entropy for the literals.
* Stores literals block type (raw, rle, compressed, repeat) and
* huffman description table to hufMetadata.
* Requires ENTROPY_WORKSPACE_SIZE workspace
* @return : size of huffman description table, or an error code
*/
static size_t
ZSTD_buildBlockEntropyStats_literals(void* const src, size_t srcSize,
const ZSTD_hufCTables_t* prevHuf,
ZSTD_hufCTables_t* nextHuf,
ZSTD_hufCTablesMetadata_t* hufMetadata,
const int literalsCompressionIsDisabled,
void* workspace, size_t wkspSize,
int hufFlags)
{
BYTE* const wkspStart = (BYTE*)workspace;
BYTE* const wkspEnd = wkspStart + wkspSize;
BYTE* const countWkspStart = wkspStart;
unsigned* const countWksp = (unsigned*)workspace;
const size_t countWkspSize = (HUF_SYMBOLVALUE_MAX + 1) * sizeof(unsigned);
BYTE* const nodeWksp = countWkspStart + countWkspSize;
const size_t nodeWkspSize = (size_t)(wkspEnd - nodeWksp);
unsigned maxSymbolValue = HUF_SYMBOLVALUE_MAX;
unsigned huffLog = LitHufLog;
HUF_repeat repeat = prevHuf->repeatMode;
DEBUGLOG(5, "ZSTD_buildBlockEntropyStats_literals (srcSize=%zu)", srcSize);
/* Prepare nextEntropy assuming reusing the existing table */
ZSTD_memcpy(nextHuf, prevHuf, sizeof(*prevHuf));
if (literalsCompressionIsDisabled) {
DEBUGLOG(5, "set_basic - disabled");
hufMetadata->hType = set_basic;
return 0;
}
/* small ? don't even attempt compression (speed opt) */
#ifndef COMPRESS_LITERALS_SIZE_MIN
# define COMPRESS_LITERALS_SIZE_MIN 63 /* heuristic */
#endif
{ size_t const minLitSize = (prevHuf->repeatMode == HUF_repeat_valid) ? 6 : COMPRESS_LITERALS_SIZE_MIN;
if (srcSize <= minLitSize) {
DEBUGLOG(5, "set_basic - too small");
hufMetadata->hType = set_basic;
return 0;
} }
/* Scan input and build symbol stats */
{ size_t const largest =
HIST_count_wksp (countWksp, &maxSymbolValue,
(const BYTE*)src, srcSize,
workspace, wkspSize);
FORWARD_IF_ERROR(largest, "HIST_count_wksp failed");
if (largest == srcSize) {
/* only one literal symbol */
DEBUGLOG(5, "set_rle");
hufMetadata->hType = set_rle;
return 0;
}
if (largest <= (srcSize >> 7)+4) {
/* heuristic: likely not compressible */
DEBUGLOG(5, "set_basic - no gain");
hufMetadata->hType = set_basic;
return 0;
} }
/* Validate the previous Huffman table */
if (repeat == HUF_repeat_check
&& !HUF_validateCTable((HUF_CElt const*)prevHuf->CTable, countWksp, maxSymbolValue)) {
repeat = HUF_repeat_none;
}
/* Build Huffman Tree */
ZSTD_memset(nextHuf->CTable, 0, sizeof(nextHuf->CTable));
huffLog = HUF_optimalTableLog(huffLog, srcSize, maxSymbolValue, nodeWksp, nodeWkspSize, nextHuf->CTable, countWksp, hufFlags);
assert(huffLog <= LitHufLog);
{ size_t const maxBits = HUF_buildCTable_wksp((HUF_CElt*)nextHuf->CTable, countWksp,
maxSymbolValue, huffLog,
nodeWksp, nodeWkspSize);
FORWARD_IF_ERROR(maxBits, "HUF_buildCTable_wksp");
huffLog = (U32)maxBits;
}
{ /* Build and write the CTable */
size_t const newCSize = HUF_estimateCompressedSize(
(HUF_CElt*)nextHuf->CTable, countWksp, maxSymbolValue);
size_t const hSize = HUF_writeCTable_wksp(
hufMetadata->hufDesBuffer, sizeof(hufMetadata->hufDesBuffer),
(HUF_CElt*)nextHuf->CTable, maxSymbolValue, huffLog,
nodeWksp, nodeWkspSize);
/* Check against repeating the previous CTable */
if (repeat != HUF_repeat_none) {
size_t const oldCSize = HUF_estimateCompressedSize(
(HUF_CElt const*)prevHuf->CTable, countWksp, maxSymbolValue);
if (oldCSize < srcSize && (oldCSize <= hSize + newCSize || hSize + 12 >= srcSize)) {
DEBUGLOG(5, "set_repeat - smaller");
ZSTD_memcpy(nextHuf, prevHuf, sizeof(*prevHuf));
hufMetadata->hType = set_repeat;
return 0;
} }
if (newCSize + hSize >= srcSize) {
DEBUGLOG(5, "set_basic - no gains");
ZSTD_memcpy(nextHuf, prevHuf, sizeof(*prevHuf));
hufMetadata->hType = set_basic;
return 0;
}
DEBUGLOG(5, "set_compressed (hSize=%u)", (U32)hSize);
hufMetadata->hType = set_compressed;
nextHuf->repeatMode = HUF_repeat_check;
return hSize;
}
}
/* ZSTD_buildDummySequencesStatistics():
* Returns a ZSTD_symbolEncodingTypeStats_t with all encoding types as set_basic,
* and updates nextEntropy to the appropriate repeatMode.
*/
static ZSTD_symbolEncodingTypeStats_t
ZSTD_buildDummySequencesStatistics(ZSTD_fseCTables_t* nextEntropy)
{
ZSTD_symbolEncodingTypeStats_t stats = {set_basic, set_basic, set_basic, 0, 0, 0};
nextEntropy->litlength_repeatMode = FSE_repeat_none;
nextEntropy->offcode_repeatMode = FSE_repeat_none;
nextEntropy->matchlength_repeatMode = FSE_repeat_none;
return stats;
}
/** ZSTD_buildBlockEntropyStats_sequences() :
* Builds entropy for the sequences.
* Stores symbol compression modes and fse table to fseMetadata.
* Requires ENTROPY_WORKSPACE_SIZE wksp.
* @return : size of fse tables or error code */
static size_t
ZSTD_buildBlockEntropyStats_sequences(
const seqStore_t* seqStorePtr,
const ZSTD_fseCTables_t* prevEntropy,
ZSTD_fseCTables_t* nextEntropy,
const ZSTD_CCtx_params* cctxParams,
ZSTD_fseCTablesMetadata_t* fseMetadata,
void* workspace, size_t wkspSize)
{
ZSTD_strategy const strategy = cctxParams->cParams.strategy;
size_t const nbSeq = (size_t)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
BYTE* const ostart = fseMetadata->fseTablesBuffer;
BYTE* const oend = ostart + sizeof(fseMetadata->fseTablesBuffer);
BYTE* op = ostart;
unsigned* countWorkspace = (unsigned*)workspace;
unsigned* entropyWorkspace = countWorkspace + (MaxSeq + 1);
size_t entropyWorkspaceSize = wkspSize - (MaxSeq + 1) * sizeof(*countWorkspace);
ZSTD_symbolEncodingTypeStats_t stats;
DEBUGLOG(5, "ZSTD_buildBlockEntropyStats_sequences (nbSeq=%zu)", nbSeq);
stats = nbSeq != 0 ? ZSTD_buildSequencesStatistics(seqStorePtr, nbSeq,
prevEntropy, nextEntropy, op, oend,
strategy, countWorkspace,
entropyWorkspace, entropyWorkspaceSize)
: ZSTD_buildDummySequencesStatistics(nextEntropy);
FORWARD_IF_ERROR(stats.size, "ZSTD_buildSequencesStatistics failed!");
fseMetadata->llType = (symbolEncodingType_e) stats.LLtype;
fseMetadata->ofType = (symbolEncodingType_e) stats.Offtype;
fseMetadata->mlType = (symbolEncodingType_e) stats.MLtype;
fseMetadata->lastCountSize = stats.lastCountSize;
return stats.size;
}
/** ZSTD_buildBlockEntropyStats() :
* Builds entropy for the block.
* Requires workspace size ENTROPY_WORKSPACE_SIZE
* @return : 0 on success, or an error code
* Note : also employed in superblock
*/
size_t ZSTD_buildBlockEntropyStats(
const seqStore_t* seqStorePtr,
const ZSTD_entropyCTables_t* prevEntropy,
ZSTD_entropyCTables_t* nextEntropy,
const ZSTD_CCtx_params* cctxParams,
ZSTD_entropyCTablesMetadata_t* entropyMetadata,
void* workspace, size_t wkspSize)
{
size_t const litSize = (size_t)(seqStorePtr->lit - seqStorePtr->litStart);
int const huf_useOptDepth = (cctxParams->cParams.strategy >= HUF_OPTIMAL_DEPTH_THRESHOLD);
int const hufFlags = huf_useOptDepth ? HUF_flags_optimalDepth : 0;
entropyMetadata->hufMetadata.hufDesSize =
ZSTD_buildBlockEntropyStats_literals(seqStorePtr->litStart, litSize,
&prevEntropy->huf, &nextEntropy->huf,
&entropyMetadata->hufMetadata,
ZSTD_literalsCompressionIsDisabled(cctxParams),
workspace, wkspSize, hufFlags);
FORWARD_IF_ERROR(entropyMetadata->hufMetadata.hufDesSize, "ZSTD_buildBlockEntropyStats_literals failed");
entropyMetadata->fseMetadata.fseTablesSize =
ZSTD_buildBlockEntropyStats_sequences(seqStorePtr,
&prevEntropy->fse, &nextEntropy->fse,
cctxParams,
&entropyMetadata->fseMetadata,
workspace, wkspSize);
FORWARD_IF_ERROR(entropyMetadata->fseMetadata.fseTablesSize, "ZSTD_buildBlockEntropyStats_sequences failed");
return 0;
}
/* Returns the size estimate for the literals section (header + content) of a block */
static size_t
ZSTD_estimateBlockSize_literal(const BYTE* literals, size_t litSize,
const ZSTD_hufCTables_t* huf,
const ZSTD_hufCTablesMetadata_t* hufMetadata,
void* workspace, size_t wkspSize,
int writeEntropy)
{
unsigned* const countWksp = (unsigned*)workspace;
unsigned maxSymbolValue = HUF_SYMBOLVALUE_MAX;
size_t literalSectionHeaderSize = 3 + (litSize >= 1 KB) + (litSize >= 16 KB);
U32 singleStream = litSize < 256;
if (hufMetadata->hType == set_basic) return litSize;
else if (hufMetadata->hType == set_rle) return 1;
else if (hufMetadata->hType == set_compressed || hufMetadata->hType == set_repeat) {
size_t const largest = HIST_count_wksp (countWksp, &maxSymbolValue, (const BYTE*)literals, litSize, workspace, wkspSize);
if (ZSTD_isError(largest)) return litSize;
{ size_t cLitSizeEstimate = HUF_estimateCompressedSize((const HUF_CElt*)huf->CTable, countWksp, maxSymbolValue);
if (writeEntropy) cLitSizeEstimate += hufMetadata->hufDesSize;
if (!singleStream) cLitSizeEstimate += 6; /* multi-stream huffman uses 6-byte jump table */
return cLitSizeEstimate + literalSectionHeaderSize;
} }
assert(0); /* impossible */
return 0;
}
/* Returns the size estimate for the FSE-compressed symbols (of, ml, ll) of a block */
static size_t
ZSTD_estimateBlockSize_symbolType(symbolEncodingType_e type,
const BYTE* codeTable, size_t nbSeq, unsigned maxCode,
const FSE_CTable* fseCTable,
const U8* additionalBits,
short const* defaultNorm, U32 defaultNormLog, U32 defaultMax,
void* workspace, size_t wkspSize)
{
unsigned* const countWksp = (unsigned*)workspace;
const BYTE* ctp = codeTable;
const BYTE* const ctStart = ctp;
const BYTE* const ctEnd = ctStart + nbSeq;
size_t cSymbolTypeSizeEstimateInBits = 0;
unsigned max = maxCode;
HIST_countFast_wksp(countWksp, &max, codeTable, nbSeq, workspace, wkspSize); /* can't fail */
if (type == set_basic) {
/* We selected this encoding type, so it must be valid. */
assert(max <= defaultMax);
(void)defaultMax;
cSymbolTypeSizeEstimateInBits = ZSTD_crossEntropyCost(defaultNorm, defaultNormLog, countWksp, max);
} else if (type == set_rle) {
cSymbolTypeSizeEstimateInBits = 0;
} else if (type == set_compressed || type == set_repeat) {
cSymbolTypeSizeEstimateInBits = ZSTD_fseBitCost(fseCTable, countWksp, max);
}
if (ZSTD_isError(cSymbolTypeSizeEstimateInBits)) {
return nbSeq * 10;
}
while (ctp < ctEnd) {
if (additionalBits) cSymbolTypeSizeEstimateInBits += additionalBits[*ctp];
else cSymbolTypeSizeEstimateInBits += *ctp; /* for offset, offset code is also the number of additional bits */
ctp++;
}
return cSymbolTypeSizeEstimateInBits >> 3;
}
/* Returns the size estimate for the sequences section (header + content) of a block */
static size_t
ZSTD_estimateBlockSize_sequences(const BYTE* ofCodeTable,
const BYTE* llCodeTable,
const BYTE* mlCodeTable,
size_t nbSeq,
const ZSTD_fseCTables_t* fseTables,
const ZSTD_fseCTablesMetadata_t* fseMetadata,
void* workspace, size_t wkspSize,
int writeEntropy)
{
size_t sequencesSectionHeaderSize = 1 /* seqHead */ + 1 /* min seqSize size */ + (nbSeq >= 128) + (nbSeq >= LONGNBSEQ);
size_t cSeqSizeEstimate = 0;
cSeqSizeEstimate += ZSTD_estimateBlockSize_symbolType(fseMetadata->ofType, ofCodeTable, nbSeq, MaxOff,
fseTables->offcodeCTable, NULL,
OF_defaultNorm, OF_defaultNormLog, DefaultMaxOff,
workspace, wkspSize);
cSeqSizeEstimate += ZSTD_estimateBlockSize_symbolType(fseMetadata->llType, llCodeTable, nbSeq, MaxLL,
fseTables->litlengthCTable, LL_bits,
LL_defaultNorm, LL_defaultNormLog, MaxLL,
workspace, wkspSize);
cSeqSizeEstimate += ZSTD_estimateBlockSize_symbolType(fseMetadata->mlType, mlCodeTable, nbSeq, MaxML,
fseTables->matchlengthCTable, ML_bits,
ML_defaultNorm, ML_defaultNormLog, MaxML,
workspace, wkspSize);
if (writeEntropy) cSeqSizeEstimate += fseMetadata->fseTablesSize;
return cSeqSizeEstimate + sequencesSectionHeaderSize;
}
/* Returns the size estimate for a given stream of literals, of, ll, ml */
static size_t
ZSTD_estimateBlockSize(const BYTE* literals, size_t litSize,
const BYTE* ofCodeTable,
const BYTE* llCodeTable,
const BYTE* mlCodeTable,
size_t nbSeq,
const ZSTD_entropyCTables_t* entropy,
const ZSTD_entropyCTablesMetadata_t* entropyMetadata,
void* workspace, size_t wkspSize,
int writeLitEntropy, int writeSeqEntropy)
{
size_t const literalsSize = ZSTD_estimateBlockSize_literal(literals, litSize,
&entropy->huf, &entropyMetadata->hufMetadata,
workspace, wkspSize, writeLitEntropy);
size_t const seqSize = ZSTD_estimateBlockSize_sequences(ofCodeTable, llCodeTable, mlCodeTable,
nbSeq, &entropy->fse, &entropyMetadata->fseMetadata,
workspace, wkspSize, writeSeqEntropy);
return seqSize + literalsSize + ZSTD_blockHeaderSize;
}
/* Builds entropy statistics and uses them for blocksize estimation.
*
* @return: estimated compressed size of the seqStore, or a zstd error.
*/
static size_t
ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize(seqStore_t* seqStore, ZSTD_CCtx* zc)
{
ZSTD_entropyCTablesMetadata_t* const entropyMetadata = &zc->blockSplitCtx.entropyMetadata;
DEBUGLOG(6, "ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize()");
FORWARD_IF_ERROR(ZSTD_buildBlockEntropyStats(seqStore,
&zc->blockState.prevCBlock->entropy,
&zc->blockState.nextCBlock->entropy,
&zc->appliedParams,
entropyMetadata,
zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE), "");
return ZSTD_estimateBlockSize(
seqStore->litStart, (size_t)(seqStore->lit - seqStore->litStart),
seqStore->ofCode, seqStore->llCode, seqStore->mlCode,
(size_t)(seqStore->sequences - seqStore->sequencesStart),
&zc->blockState.nextCBlock->entropy,
entropyMetadata,
zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE,
(int)(entropyMetadata->hufMetadata.hType == set_compressed), 1);
}
/* Returns literals bytes represented in a seqStore */
static size_t ZSTD_countSeqStoreLiteralsBytes(const seqStore_t* const seqStore)
{
size_t literalsBytes = 0;
size_t const nbSeqs = (size_t)(seqStore->sequences - seqStore->sequencesStart);
size_t i;
for (i = 0; i < nbSeqs; ++i) {
seqDef const seq = seqStore->sequencesStart[i];
literalsBytes += seq.litLength;
if (i == seqStore->longLengthPos && seqStore->longLengthType == ZSTD_llt_literalLength) {
literalsBytes += 0x10000;
} }
return literalsBytes;
}
/* Returns match bytes represented in a seqStore */
static size_t ZSTD_countSeqStoreMatchBytes(const seqStore_t* const seqStore)
{
size_t matchBytes = 0;
size_t const nbSeqs = (size_t)(seqStore->sequences - seqStore->sequencesStart);
size_t i;
for (i = 0; i < nbSeqs; ++i) {
seqDef seq = seqStore->sequencesStart[i];
matchBytes += seq.mlBase + MINMATCH;
if (i == seqStore->longLengthPos && seqStore->longLengthType == ZSTD_llt_matchLength) {
matchBytes += 0x10000;
} }
return matchBytes;
}
/* Derives the seqStore that is a chunk of the originalSeqStore from [startIdx, endIdx).
* Stores the result in resultSeqStore.
*/
static void ZSTD_deriveSeqStoreChunk(seqStore_t* resultSeqStore,
const seqStore_t* originalSeqStore,
size_t startIdx, size_t endIdx)
{
*resultSeqStore = *originalSeqStore;
if (startIdx > 0) {
resultSeqStore->sequences = originalSeqStore->sequencesStart + startIdx;
resultSeqStore->litStart += ZSTD_countSeqStoreLiteralsBytes(resultSeqStore);
}
/* Move longLengthPos into the correct position if necessary */
if (originalSeqStore->longLengthType != ZSTD_llt_none) {
if (originalSeqStore->longLengthPos < startIdx || originalSeqStore->longLengthPos > endIdx) {
resultSeqStore->longLengthType = ZSTD_llt_none;
} else {
resultSeqStore->longLengthPos -= (U32)startIdx;
}
}
resultSeqStore->sequencesStart = originalSeqStore->sequencesStart + startIdx;
resultSeqStore->sequences = originalSeqStore->sequencesStart + endIdx;
if (endIdx == (size_t)(originalSeqStore->sequences - originalSeqStore->sequencesStart)) {
/* This accounts for possible last literals if the derived chunk reaches the end of the block */
assert(resultSeqStore->lit == originalSeqStore->lit);
} else {
size_t const literalsBytes = ZSTD_countSeqStoreLiteralsBytes(resultSeqStore);
resultSeqStore->lit = resultSeqStore->litStart + literalsBytes;
}
resultSeqStore->llCode += startIdx;
resultSeqStore->mlCode += startIdx;
resultSeqStore->ofCode += startIdx;
}
/**
* Returns the raw offset represented by the combination of offBase, ll0, and repcode history.
* offBase must represent a repcode in the numeric representation of ZSTD_storeSeq().
*/
static U32
ZSTD_resolveRepcodeToRawOffset(const U32 rep[ZSTD_REP_NUM], const U32 offBase, const U32 ll0)
{
U32 const adjustedRepCode = OFFBASE_TO_REPCODE(offBase) - 1 + ll0; /* [ 0 - 3 ] */
assert(OFFBASE_IS_REPCODE(offBase));
if (adjustedRepCode == ZSTD_REP_NUM) {
assert(ll0);
/* litlength == 0 and offCode == 2 implies selection of first repcode - 1
* This is only valid if it results in a valid offset value, aka > 0.
* Note : it may happen that `rep[0]==1` in exceptional circumstances.
* In which case this function will return 0, which is an invalid offset.
* It's not an issue though, since this value will be
* compared and discarded within ZSTD_seqStore_resolveOffCodes().
*/
return rep[0] - 1;
}
return rep[adjustedRepCode];
}
/**
* ZSTD_seqStore_resolveOffCodes() reconciles any possible divergences in offset history that may arise
* due to emission of RLE/raw blocks that disturb the offset history,
* and replaces any repcodes within the seqStore that may be invalid.
*
* dRepcodes are updated as would be on the decompression side.
* cRepcodes are updated exactly in accordance with the seqStore.
*
* Note : this function assumes seq->offBase respects the following numbering scheme :
* 0 : invalid
* 1-3 : repcode 1-3
* 4+ : real_offset+3
*/
static void
ZSTD_seqStore_resolveOffCodes(repcodes_t* const dRepcodes, repcodes_t* const cRepcodes,
const seqStore_t* const seqStore, U32 const nbSeq)
{
U32 idx = 0;
U32 const longLitLenIdx = seqStore->longLengthType == ZSTD_llt_literalLength ? seqStore->longLengthPos : nbSeq;
for (; idx < nbSeq; ++idx) {
seqDef* const seq = seqStore->sequencesStart + idx;
U32 const ll0 = (seq->litLength == 0) && (idx != longLitLenIdx);
U32 const offBase = seq->offBase;
assert(offBase > 0);
if (OFFBASE_IS_REPCODE(offBase)) {
U32 const dRawOffset = ZSTD_resolveRepcodeToRawOffset(dRepcodes->rep, offBase, ll0);
U32 const cRawOffset = ZSTD_resolveRepcodeToRawOffset(cRepcodes->rep, offBase, ll0);
/* Adjust simulated decompression repcode history if we come across a mismatch. Replace
* the repcode with the offset it actually references, determined by the compression
* repcode history.
*/
if (dRawOffset != cRawOffset) {
seq->offBase = OFFSET_TO_OFFBASE(cRawOffset);
}
}
/* Compression repcode history is always updated with values directly from the unmodified seqStore.
* Decompression repcode history may use modified seq->offset value taken from compression repcode history.
*/
ZSTD_updateRep(dRepcodes->rep, seq->offBase, ll0);
ZSTD_updateRep(cRepcodes->rep, offBase, ll0);
}
}
/* ZSTD_compressSeqStore_singleBlock():
* Compresses a seqStore into a block with a block header, into the buffer dst.
*
* Returns the total size of that block (including header) or a ZSTD error code.
*/
static size_t
ZSTD_compressSeqStore_singleBlock(ZSTD_CCtx* zc,
const seqStore_t* const seqStore,
repcodes_t* const dRep, repcodes_t* const cRep,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
U32 lastBlock, U32 isPartition)
{
const U32 rleMaxLength = 25;
BYTE* op = (BYTE*)dst;
const BYTE* ip = (const BYTE*)src;
size_t cSize;
size_t cSeqsSize;
/* In case of an RLE or raw block, the simulated decompression repcode history must be reset */
repcodes_t const dRepOriginal = *dRep;
DEBUGLOG(5, "ZSTD_compressSeqStore_singleBlock");
if (isPartition)
ZSTD_seqStore_resolveOffCodes(dRep, cRep, seqStore, (U32)(seqStore->sequences - seqStore->sequencesStart));
RETURN_ERROR_IF(dstCapacity < ZSTD_blockHeaderSize, dstSize_tooSmall, "Block header doesn't fit");
cSeqsSize = ZSTD_entropyCompressSeqStore(seqStore,
&zc->blockState.prevCBlock->entropy, &zc->blockState.nextCBlock->entropy,
&zc->appliedParams,
op + ZSTD_blockHeaderSize, dstCapacity - ZSTD_blockHeaderSize,
srcSize,
zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE /* statically allocated in resetCCtx */,
zc->bmi2);
FORWARD_IF_ERROR(cSeqsSize, "ZSTD_entropyCompressSeqStore failed!");
if (!zc->isFirstBlock &&
cSeqsSize < rleMaxLength &&
ZSTD_isRLE((BYTE const*)src, srcSize)) {
/* We don't want to emit our first block as a RLE even if it qualifies because
* doing so will cause the decoder (cli only) to throw a "should consume all input error."
* This is only an issue for zstd <= v1.4.3
*/
cSeqsSize = 1;
}
/* Sequence collection not supported when block splitting */
if (zc->seqCollector.collectSequences) {
FORWARD_IF_ERROR(ZSTD_copyBlockSequences(&zc->seqCollector, seqStore, dRepOriginal.rep), "copyBlockSequences failed");
ZSTD_blockState_confirmRepcodesAndEntropyTables(&zc->blockState);
return 0;
}
if (cSeqsSize == 0) {
cSize = ZSTD_noCompressBlock(op, dstCapacity, ip, srcSize, lastBlock);
FORWARD_IF_ERROR(cSize, "Nocompress block failed");
DEBUGLOG(4, "Writing out nocompress block, size: %zu", cSize);
*dRep = dRepOriginal; /* reset simulated decompression repcode history */
} else if (cSeqsSize == 1) {
cSize = ZSTD_rleCompressBlock(op, dstCapacity, *ip, srcSize, lastBlock);
FORWARD_IF_ERROR(cSize, "RLE compress block failed");
DEBUGLOG(4, "Writing out RLE block, size: %zu", cSize);
*dRep = dRepOriginal; /* reset simulated decompression repcode history */
} else {
ZSTD_blockState_confirmRepcodesAndEntropyTables(&zc->blockState);
writeBlockHeader(op, cSeqsSize, srcSize, lastBlock);
cSize = ZSTD_blockHeaderSize + cSeqsSize;
DEBUGLOG(4, "Writing out compressed block, size: %zu", cSize);
}
if (zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid)
zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check;
return cSize;
}
/* Struct to keep track of where we are in our recursive calls. */
typedef struct {
U32* splitLocations; /* Array of split indices */
size_t idx; /* The current index within splitLocations being worked on */
} seqStoreSplits;
#define MIN_SEQUENCES_BLOCK_SPLITTING 300
/* Helper function to perform the recursive search for block splits.
* Estimates the cost of seqStore prior to split, and estimates the cost of splitting the sequences in half.
* If advantageous to split, then we recurse down the two sub-blocks.
* If not, or if an error occurred in estimation, then we do not recurse.
*
* Note: The recursion depth is capped by a heuristic minimum number of sequences,
* defined by MIN_SEQUENCES_BLOCK_SPLITTING.
* In theory, this means the absolute largest recursion depth is 10 == log2(maxNbSeqInBlock/MIN_SEQUENCES_BLOCK_SPLITTING).
* In practice, recursion depth usually doesn't go beyond 4.
*
* Furthermore, the number of splits is capped by ZSTD_MAX_NB_BLOCK_SPLITS.
* At ZSTD_MAX_NB_BLOCK_SPLITS == 196 with the current existing blockSize
* maximum of 128 KB, this value is actually impossible to reach.
*/
static void
ZSTD_deriveBlockSplitsHelper(seqStoreSplits* splits, size_t startIdx, size_t endIdx,
ZSTD_CCtx* zc, const seqStore_t* origSeqStore)
{
seqStore_t* const fullSeqStoreChunk = &zc->blockSplitCtx.fullSeqStoreChunk;
seqStore_t* const firstHalfSeqStore = &zc->blockSplitCtx.firstHalfSeqStore;
seqStore_t* const secondHalfSeqStore = &zc->blockSplitCtx.secondHalfSeqStore;
size_t estimatedOriginalSize;
size_t estimatedFirstHalfSize;
size_t estimatedSecondHalfSize;
size_t midIdx = (startIdx + endIdx)/2;
DEBUGLOG(5, "ZSTD_deriveBlockSplitsHelper: startIdx=%zu endIdx=%zu", startIdx, endIdx);
assert(endIdx >= startIdx);
if (endIdx - startIdx < MIN_SEQUENCES_BLOCK_SPLITTING || splits->idx >= ZSTD_MAX_NB_BLOCK_SPLITS) {
DEBUGLOG(6, "ZSTD_deriveBlockSplitsHelper: Too few sequences (%zu)", endIdx - startIdx);
return;
}
ZSTD_deriveSeqStoreChunk(fullSeqStoreChunk, origSeqStore, startIdx, endIdx);
ZSTD_deriveSeqStoreChunk(firstHalfSeqStore, origSeqStore, startIdx, midIdx);
ZSTD_deriveSeqStoreChunk(secondHalfSeqStore, origSeqStore, midIdx, endIdx);
estimatedOriginalSize = ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize(fullSeqStoreChunk, zc);
estimatedFirstHalfSize = ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize(firstHalfSeqStore, zc);
estimatedSecondHalfSize = ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize(secondHalfSeqStore, zc);
DEBUGLOG(5, "Estimated original block size: %zu -- First half split: %zu -- Second half split: %zu",
estimatedOriginalSize, estimatedFirstHalfSize, estimatedSecondHalfSize);
if (ZSTD_isError(estimatedOriginalSize) || ZSTD_isError(estimatedFirstHalfSize) || ZSTD_isError(estimatedSecondHalfSize)) {
return;
}
if (estimatedFirstHalfSize + estimatedSecondHalfSize < estimatedOriginalSize) {
DEBUGLOG(5, "split decided at seqNb:%zu", midIdx);
ZSTD_deriveBlockSplitsHelper(splits, startIdx, midIdx, zc, origSeqStore);
splits->splitLocations[splits->idx] = (U32)midIdx;
splits->idx++;
ZSTD_deriveBlockSplitsHelper(splits, midIdx, endIdx, zc, origSeqStore);
}
}
/* Base recursive function.
* Populates a table with intra-block partition indices that can improve compression ratio.
*
* @return: number of splits made (which equals the size of the partition table - 1).
*/
static size_t ZSTD_deriveBlockSplits(ZSTD_CCtx* zc, U32 partitions[], U32 nbSeq)
{
seqStoreSplits splits;
splits.splitLocations = partitions;
splits.idx = 0;
if (nbSeq <= 4) {
DEBUGLOG(5, "ZSTD_deriveBlockSplits: Too few sequences to split (%u <= 4)", nbSeq);
/* Refuse to try and split anything with less than 4 sequences */
return 0;
}
ZSTD_deriveBlockSplitsHelper(&splits, 0, nbSeq, zc, &zc->seqStore);
splits.splitLocations[splits.idx] = nbSeq;
DEBUGLOG(5, "ZSTD_deriveBlockSplits: final nb partitions: %zu", splits.idx+1);
return splits.idx;
}
/* ZSTD_compressBlock_splitBlock():
* Attempts to split a given block into multiple blocks to improve compression ratio.
*
* Returns combined size of all blocks (which includes headers), or a ZSTD error code.
*/
static size_t
ZSTD_compressBlock_splitBlock_internal(ZSTD_CCtx* zc,
void* dst, size_t dstCapacity,
const void* src, size_t blockSize,
U32 lastBlock, U32 nbSeq)
{
size_t cSize = 0;
const BYTE* ip = (const BYTE*)src;
BYTE* op = (BYTE*)dst;
size_t i = 0;
size_t srcBytesTotal = 0;
U32* const partitions = zc->blockSplitCtx.partitions; /* size == ZSTD_MAX_NB_BLOCK_SPLITS */
seqStore_t* const nextSeqStore = &zc->blockSplitCtx.nextSeqStore;
seqStore_t* const currSeqStore = &zc->blockSplitCtx.currSeqStore;
size_t const numSplits = ZSTD_deriveBlockSplits(zc, partitions, nbSeq);
/* If a block is split and some partitions are emitted as RLE/uncompressed, then repcode history
* may become invalid. In order to reconcile potentially invalid repcodes, we keep track of two
* separate repcode histories that simulate repcode history on compression and decompression side,
* and use the histories to determine whether we must replace a particular repcode with its raw offset.
*
* 1) cRep gets updated for each partition, regardless of whether the block was emitted as uncompressed
* or RLE. This allows us to retrieve the offset value that an invalid repcode references within
* a nocompress/RLE block.
* 2) dRep gets updated only for compressed partitions, and when a repcode gets replaced, will use
* the replacement offset value rather than the original repcode to update the repcode history.
* dRep also will be the final repcode history sent to the next block.
*
* See ZSTD_seqStore_resolveOffCodes() for more details.
*/
repcodes_t dRep;
repcodes_t cRep;
ZSTD_memcpy(dRep.rep, zc->blockState.prevCBlock->rep, sizeof(repcodes_t));
ZSTD_memcpy(cRep.rep, zc->blockState.prevCBlock->rep, sizeof(repcodes_t));
ZSTD_memset(nextSeqStore, 0, sizeof(seqStore_t));
DEBUGLOG(5, "ZSTD_compressBlock_splitBlock_internal (dstCapacity=%u, dictLimit=%u, nextToUpdate=%u)",
(unsigned)dstCapacity, (unsigned)zc->blockState.matchState.window.dictLimit,
(unsigned)zc->blockState.matchState.nextToUpdate);
if (numSplits == 0) {
size_t cSizeSingleBlock =
ZSTD_compressSeqStore_singleBlock(zc, &zc->seqStore,
&dRep, &cRep,
op, dstCapacity,
ip, blockSize,
lastBlock, 0 /* isPartition */);
FORWARD_IF_ERROR(cSizeSingleBlock, "Compressing single block from splitBlock_internal() failed!");
DEBUGLOG(5, "ZSTD_compressBlock_splitBlock_internal: No splits");
assert(zc->blockSize <= ZSTD_BLOCKSIZE_MAX);
assert(cSizeSingleBlock <= zc->blockSize + ZSTD_blockHeaderSize);
return cSizeSingleBlock;
}
ZSTD_deriveSeqStoreChunk(currSeqStore, &zc->seqStore, 0, partitions[0]);
for (i = 0; i <= numSplits; ++i) {
size_t cSizeChunk;
U32 const lastPartition = (i == numSplits);
U32 lastBlockEntireSrc = 0;
size_t srcBytes = ZSTD_countSeqStoreLiteralsBytes(currSeqStore) + ZSTD_countSeqStoreMatchBytes(currSeqStore);
srcBytesTotal += srcBytes;
if (lastPartition) {
/* This is the final partition, need to account for possible last literals */
srcBytes += blockSize - srcBytesTotal;
lastBlockEntireSrc = lastBlock;
} else {
ZSTD_deriveSeqStoreChunk(nextSeqStore, &zc->seqStore, partitions[i], partitions[i+1]);
}
cSizeChunk = ZSTD_compressSeqStore_singleBlock(zc, currSeqStore,
&dRep, &cRep,
op, dstCapacity,
ip, srcBytes,
lastBlockEntireSrc, 1 /* isPartition */);
DEBUGLOG(5, "Estimated size: %zu vs %zu : actual size",
ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize(currSeqStore, zc), cSizeChunk);
FORWARD_IF_ERROR(cSizeChunk, "Compressing chunk failed!");
ip += srcBytes;
op += cSizeChunk;
dstCapacity -= cSizeChunk;
cSize += cSizeChunk;
*currSeqStore = *nextSeqStore;
assert(cSizeChunk <= zc->blockSize + ZSTD_blockHeaderSize);
}
/* cRep and dRep may have diverged during the compression.
* If so, we use the dRep repcodes for the next block.
*/
ZSTD_memcpy(zc->blockState.prevCBlock->rep, dRep.rep, sizeof(repcodes_t));
return cSize;
}
static size_t
ZSTD_compressBlock_splitBlock(ZSTD_CCtx* zc,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize, U32 lastBlock)
{
U32 nbSeq;
size_t cSize;
DEBUGLOG(4, "ZSTD_compressBlock_splitBlock");
assert(zc->appliedParams.useBlockSplitter == ZSTD_ps_enable);
{ const size_t bss = ZSTD_buildSeqStore(zc, src, srcSize);
FORWARD_IF_ERROR(bss, "ZSTD_buildSeqStore failed");
if (bss == ZSTDbss_noCompress) {
if (zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid)
zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check;
RETURN_ERROR_IF(zc->seqCollector.collectSequences, sequenceProducer_failed, "Uncompressible block");
cSize = ZSTD_noCompressBlock(dst, dstCapacity, src, srcSize, lastBlock);
FORWARD_IF_ERROR(cSize, "ZSTD_noCompressBlock failed");
DEBUGLOG(4, "ZSTD_compressBlock_splitBlock: Nocompress block");
return cSize;
}
nbSeq = (U32)(zc->seqStore.sequences - zc->seqStore.sequencesStart);
}
cSize = ZSTD_compressBlock_splitBlock_internal(zc, dst, dstCapacity, src, srcSize, lastBlock, nbSeq);
FORWARD_IF_ERROR(cSize, "Splitting blocks failed!");
return cSize;
}
static size_t
ZSTD_compressBlock_internal(ZSTD_CCtx* zc,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize, U32 frame)
{
/* This is an estimated upper bound for the length of an rle block.
* This isn't the actual upper bound.
* Finding the real threshold needs further investigation.
*/
const U32 rleMaxLength = 25;
size_t cSize;
const BYTE* ip = (const BYTE*)src;
BYTE* op = (BYTE*)dst;
DEBUGLOG(5, "ZSTD_compressBlock_internal (dstCapacity=%u, dictLimit=%u, nextToUpdate=%u)",
(unsigned)dstCapacity, (unsigned)zc->blockState.matchState.window.dictLimit,
(unsigned)zc->blockState.matchState.nextToUpdate);
{ const size_t bss = ZSTD_buildSeqStore(zc, src, srcSize);
FORWARD_IF_ERROR(bss, "ZSTD_buildSeqStore failed");
if (bss == ZSTDbss_noCompress) {
RETURN_ERROR_IF(zc->seqCollector.collectSequences, sequenceProducer_failed, "Uncompressible block");
cSize = 0;
goto out;
}
}
if (zc->seqCollector.collectSequences) {
FORWARD_IF_ERROR(ZSTD_copyBlockSequences(&zc->seqCollector, ZSTD_getSeqStore(zc), zc->blockState.prevCBlock->rep), "copyBlockSequences failed");
ZSTD_blockState_confirmRepcodesAndEntropyTables(&zc->blockState);
return 0;
}
/* encode sequences and literals */
cSize = ZSTD_entropyCompressSeqStore(&zc->seqStore,
&zc->blockState.prevCBlock->entropy, &zc->blockState.nextCBlock->entropy,
&zc->appliedParams,
dst, dstCapacity,
srcSize,
zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE /* statically allocated in resetCCtx */,
zc->bmi2);
if (frame &&
/* We don't want to emit our first block as a RLE even if it qualifies because
* doing so will cause the decoder (cli only) to throw a "should consume all input error."
* This is only an issue for zstd <= v1.4.3
*/
!zc->isFirstBlock &&
cSize < rleMaxLength &&
ZSTD_isRLE(ip, srcSize))
{
cSize = 1;
op[0] = ip[0];
}
out:
if (!ZSTD_isError(cSize) && cSize > 1) {
ZSTD_blockState_confirmRepcodesAndEntropyTables(&zc->blockState);
}
/* We check that dictionaries have offset codes available for the first
* block. After the first block, the offcode table might not have large
* enough codes to represent the offsets in the data.
*/
if (zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid)
zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check;
return cSize;
}
static size_t ZSTD_compressBlock_targetCBlockSize_body(ZSTD_CCtx* zc,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
const size_t bss, U32 lastBlock)
{
DEBUGLOG(6, "Attempting ZSTD_compressSuperBlock()");
if (bss == ZSTDbss_compress) {
if (/* We don't want to emit our first block as a RLE even if it qualifies because
* doing so will cause the decoder (cli only) to throw a "should consume all input error."
* This is only an issue for zstd <= v1.4.3
*/
!zc->isFirstBlock &&
ZSTD_maybeRLE(&zc->seqStore) &&
ZSTD_isRLE((BYTE const*)src, srcSize))
{
return ZSTD_rleCompressBlock(dst, dstCapacity, *(BYTE const*)src, srcSize, lastBlock);
}
/* Attempt superblock compression.
*
* Note that compressed size of ZSTD_compressSuperBlock() is not bound by the
* standard ZSTD_compressBound(). This is a problem, because even if we have
* space now, taking an extra byte now could cause us to run out of space later
* and violate ZSTD_compressBound().
*
* Define blockBound(blockSize) = blockSize + ZSTD_blockHeaderSize.
*
* In order to respect ZSTD_compressBound() we must attempt to emit a raw
* uncompressed block in these cases:
* * cSize == 0: Return code for an uncompressed block.
* * cSize == dstSize_tooSmall: We may have expanded beyond blockBound(srcSize).
* ZSTD_noCompressBlock() will return dstSize_tooSmall if we are really out of
* output space.
* * cSize >= blockBound(srcSize): We have expanded the block too much so
* emit an uncompressed block.
*/
{ size_t const cSize =
ZSTD_compressSuperBlock(zc, dst, dstCapacity, src, srcSize, lastBlock);
if (cSize != ERROR(dstSize_tooSmall)) {
size_t const maxCSize =
srcSize - ZSTD_minGain(srcSize, zc->appliedParams.cParams.strategy);
FORWARD_IF_ERROR(cSize, "ZSTD_compressSuperBlock failed");
if (cSize != 0 && cSize < maxCSize + ZSTD_blockHeaderSize) {
ZSTD_blockState_confirmRepcodesAndEntropyTables(&zc->blockState);
return cSize;
}
}
}
} /* if (bss == ZSTDbss_compress)*/
DEBUGLOG(6, "Resorting to ZSTD_noCompressBlock()");
/* Superblock compression failed, attempt to emit a single no compress block.
* The decoder will be able to stream this block since it is uncompressed.
*/
return ZSTD_noCompressBlock(dst, dstCapacity, src, srcSize, lastBlock);
}
static size_t ZSTD_compressBlock_targetCBlockSize(ZSTD_CCtx* zc,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
U32 lastBlock)
{
size_t cSize = 0;
const size_t bss = ZSTD_buildSeqStore(zc, src, srcSize);
DEBUGLOG(5, "ZSTD_compressBlock_targetCBlockSize (dstCapacity=%u, dictLimit=%u, nextToUpdate=%u, srcSize=%zu)",
(unsigned)dstCapacity, (unsigned)zc->blockState.matchState.window.dictLimit, (unsigned)zc->blockState.matchState.nextToUpdate, srcSize);
FORWARD_IF_ERROR(bss, "ZSTD_buildSeqStore failed");
cSize = ZSTD_compressBlock_targetCBlockSize_body(zc, dst, dstCapacity, src, srcSize, bss, lastBlock);
FORWARD_IF_ERROR(cSize, "ZSTD_compressBlock_targetCBlockSize_body failed");
if (zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid)
zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check;
return cSize;
}
static void ZSTD_overflowCorrectIfNeeded(ZSTD_matchState_t* ms,
ZSTD_cwksp* ws,
ZSTD_CCtx_params const* params,
void const* ip,
void const* iend)
{
U32 const cycleLog = ZSTD_cycleLog(params->cParams.chainLog, params->cParams.strategy);
U32 const maxDist = (U32)1 << params->cParams.windowLog;
if (ZSTD_window_needOverflowCorrection(ms->window, cycleLog, maxDist, ms->loadedDictEnd, ip, iend)) {
U32 const correction = ZSTD_window_correctOverflow(&ms->window, cycleLog, maxDist, ip);
ZSTD_STATIC_ASSERT(ZSTD_CHAINLOG_MAX <= 30);
ZSTD_STATIC_ASSERT(ZSTD_WINDOWLOG_MAX_32 <= 30);
ZSTD_STATIC_ASSERT(ZSTD_WINDOWLOG_MAX <= 31);
ZSTD_cwksp_mark_tables_dirty(ws);
ZSTD_reduceIndex(ms, params, correction);
ZSTD_cwksp_mark_tables_clean(ws);
if (ms->nextToUpdate < correction) ms->nextToUpdate = 0;
else ms->nextToUpdate -= correction;
/* invalidate dictionaries on overflow correction */
ms->loadedDictEnd = 0;
ms->dictMatchState = NULL;
}
}
/*! ZSTD_compress_frameChunk() :
* 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_frameChunk(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 = (U32)1 << cctx->appliedParams.cParams.windowLog;
assert(cctx->appliedParams.cParams.windowLog <= ZSTD_WINDOWLOG_MAX);
DEBUGLOG(4, "ZSTD_compress_frameChunk (blockSize=%u)", (unsigned)blockSize);
if (cctx->appliedParams.fParams.checksumFlag && srcSize)
XXH64_update(&cctx->xxhState, src, srcSize);
while (remaining) {
ZSTD_matchState_t* const ms = &cctx->blockState.matchState;
U32 const lastBlock = lastFrameChunk & (blockSize >= remaining);
/* TODO: See 3090. We reduced MIN_CBLOCK_SIZE from 3 to 2 so to compensate we are adding
* additional 1. We need to revisit and change this logic to be more consistent */
RETURN_ERROR_IF(dstCapacity < ZSTD_blockHeaderSize + MIN_CBLOCK_SIZE + 1,
dstSize_tooSmall,
"not enough space to store compressed block");
if (remaining < blockSize) blockSize = remaining;
ZSTD_overflowCorrectIfNeeded(
ms, &cctx->workspace, &cctx->appliedParams, ip, ip + blockSize);
ZSTD_checkDictValidity(&ms->window, ip + blockSize, maxDist, &ms->loadedDictEnd, &ms->dictMatchState);
ZSTD_window_enforceMaxDist(&ms->window, ip, maxDist, &ms->loadedDictEnd, &ms->dictMatchState);
/* Ensure hash/chain table insertion resumes no sooner than lowlimit */
if (ms->nextToUpdate < ms->window.lowLimit) ms->nextToUpdate = ms->window.lowLimit;
{ size_t cSize;
if (ZSTD_useTargetCBlockSize(&cctx->appliedParams)) {
cSize = ZSTD_compressBlock_targetCBlockSize(cctx, op, dstCapacity, ip, blockSize, lastBlock);
FORWARD_IF_ERROR(cSize, "ZSTD_compressBlock_targetCBlockSize failed");
assert(cSize > 0);
assert(cSize <= blockSize + ZSTD_blockHeaderSize);
} else if (ZSTD_blockSplitterEnabled(&cctx->appliedParams)) {
cSize = ZSTD_compressBlock_splitBlock(cctx, op, dstCapacity, ip, blockSize, lastBlock);
FORWARD_IF_ERROR(cSize, "ZSTD_compressBlock_splitBlock failed");
assert(cSize > 0 || cctx->seqCollector.collectSequences == 1);
} else {
cSize = ZSTD_compressBlock_internal(cctx,
op+ZSTD_blockHeaderSize, dstCapacity-ZSTD_blockHeaderSize,
ip, blockSize, 1 /* frame */);
FORWARD_IF_ERROR(cSize, "ZSTD_compressBlock_internal failed");
if (cSize == 0) { /* block is not compressible */
cSize = ZSTD_noCompressBlock(op, dstCapacity, ip, blockSize, lastBlock);
FORWARD_IF_ERROR(cSize, "ZSTD_noCompressBlock failed");
} else {
U32 const cBlockHeader = cSize == 1 ?
lastBlock + (((U32)bt_rle)<<1) + (U32)(blockSize << 3) :
lastBlock + (((U32)bt_compressed)<<1) + (U32)(cSize << 3);
MEM_writeLE24(op, cBlockHeader);
cSize += ZSTD_blockHeaderSize;
}
} /* if (ZSTD_useTargetCBlockSize(&cctx->appliedParams))*/
ip += blockSize;
assert(remaining >= blockSize);
remaining -= blockSize;
op += cSize;
assert(dstCapacity >= cSize);
dstCapacity -= cSize;
cctx->isFirstBlock = 0;
DEBUGLOG(5, "ZSTD_compress_frameChunk: adding a block of size %u",
(unsigned)cSize);
} }
if (lastFrameChunk && (op>ostart)) cctx->stage = ZSTDcs_ending;
return (size_t)(op-ostart);
}
static size_t ZSTD_writeFrameHeader(void* dst, size_t dstCapacity,
const ZSTD_CCtx_params* params, U64 pledgedSrcSize, U32 dictID)
{ BYTE* const op = (BYTE*)dst;
U32 const dictIDSizeCodeLength = (dictID>0) + (dictID>=256) + (dictID>=65536); /* 0-3 */
U32 const dictIDSizeCode = params->fParams.noDictIDFlag ? 0 : dictIDSizeCodeLength; /* 0-3 */
U32 const checksumFlag = params->fParams.checksumFlag>0;
U32 const windowSize = (U32)1 << 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 frameHeaderDescriptionByte = (BYTE)(dictIDSizeCode + (checksumFlag<<2) + (singleSegment<<5) + (fcsCode<<6) );
size_t pos=0;
assert(!(params->fParams.contentSizeFlag && pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN));
RETURN_ERROR_IF(dstCapacity < ZSTD_FRAMEHEADERSIZE_MAX, dstSize_tooSmall,
"dst buf is too small to fit worst-case frame header size.");
DEBUGLOG(4, "ZSTD_writeFrameHeader : dictIDFlag : %u ; dictID : %u ; dictIDSizeCode : %u",
!params->fParams.noDictIDFlag, (unsigned)dictID, (unsigned)dictIDSizeCode);
if (params->format == ZSTD_f_zstd1) {
MEM_writeLE32(dst, ZSTD_MAGICNUMBER);
pos = 4;
}
op[pos++] = frameHeaderDescriptionByte;
if (!singleSegment) op[pos++] = windowLogByte;
switch(dictIDSizeCode)
{
default:
assert(0); /* impossible */
ZSTD_FALLTHROUGH;
case 0 : break;
case 1 : op[pos] = (BYTE)(dictID); pos++; break;
case 2 : MEM_writeLE16(op+pos, (U16)dictID); pos+=2; break;
case 3 : MEM_writeLE32(op+pos, dictID); pos+=4; break;
}
switch(fcsCode)
{
default:
assert(0); /* impossible */
ZSTD_FALLTHROUGH;
case 0 : if (singleSegment) op[pos++] = (BYTE)(pledgedSrcSize); break;
case 1 : MEM_writeLE16(op+pos, (U16)(pledgedSrcSize-256)); pos+=2; break;
case 2 : MEM_writeLE32(op+pos, (U32)(pledgedSrcSize)); pos+=4; break;
case 3 : MEM_writeLE64(op+pos, (U64)(pledgedSrcSize)); pos+=8; break;
}
return pos;
}
/* ZSTD_writeSkippableFrame_advanced() :
* Writes out a skippable frame with the specified magic number variant (16 are supported),
* from ZSTD_MAGIC_SKIPPABLE_START to ZSTD_MAGIC_SKIPPABLE_START+15, and the desired source data.
*
* Returns the total number of bytes written, or a ZSTD error code.
*/
size_t ZSTD_writeSkippableFrame(void* dst, size_t dstCapacity,
const void* src, size_t srcSize, unsigned magicVariant) {
BYTE* op = (BYTE*)dst;
RETURN_ERROR_IF(dstCapacity < srcSize + ZSTD_SKIPPABLEHEADERSIZE /* Skippable frame overhead */,
dstSize_tooSmall, "Not enough room for skippable frame");
RETURN_ERROR_IF(srcSize > (unsigned)0xFFFFFFFF, srcSize_wrong, "Src size too large for skippable frame");
RETURN_ERROR_IF(magicVariant > 15, parameter_outOfBound, "Skippable frame magic number variant not supported");
MEM_writeLE32(op, (U32)(ZSTD_MAGIC_SKIPPABLE_START + magicVariant));
MEM_writeLE32(op+4, (U32)srcSize);
ZSTD_memcpy(op+8, src, srcSize);
return srcSize + ZSTD_SKIPPABLEHEADERSIZE;
}
/* ZSTD_writeLastEmptyBlock() :
* output an empty Block with end-of-frame mark to complete a frame
* @return : size of data written into `dst` (== ZSTD_blockHeaderSize (defined in zstd_internal.h))
* or an error code if `dstCapacity` is too small (<ZSTD_blockHeaderSize)
*/
size_t ZSTD_writeLastEmptyBlock(void* dst, size_t dstCapacity)
{
RETURN_ERROR_IF(dstCapacity < ZSTD_blockHeaderSize, dstSize_tooSmall,
"dst buf is too small to write frame trailer empty block.");
{ U32 const cBlockHeader24 = 1 /*lastBlock*/ + (((U32)bt_raw)<<1); /* 0 size */
MEM_writeLE24(dst, cBlockHeader24);
return ZSTD_blockHeaderSize;
}
}
void ZSTD_referenceExternalSequences(ZSTD_CCtx* cctx, rawSeq* seq, size_t nbSeq)
{
assert(cctx->stage == ZSTDcs_init);
assert(nbSeq == 0 || cctx->appliedParams.ldmParams.enableLdm != ZSTD_ps_enable);
cctx->externSeqStore.seq = seq;
cctx->externSeqStore.size = nbSeq;
cctx->externSeqStore.capacity = nbSeq;
cctx->externSeqStore.pos = 0;
cctx->externSeqStore.posInSequence = 0;
}
static size_t ZSTD_compressContinue_internal (ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
U32 frame, U32 lastFrameChunk)
{
ZSTD_matchState_t* const ms = &cctx->blockState.matchState;
size_t fhSize = 0;
DEBUGLOG(5, "ZSTD_compressContinue_internal, stage: %u, srcSize: %u",
cctx->stage, (unsigned)srcSize);
RETURN_ERROR_IF(cctx->stage==ZSTDcs_created, stage_wrong,
"missing init (ZSTD_compressBegin)");
if (frame && (cctx->stage==ZSTDcs_init)) {
fhSize = ZSTD_writeFrameHeader(dst, dstCapacity, &cctx->appliedParams,
cctx->pledgedSrcSizePlusOne-1, cctx->dictID);
FORWARD_IF_ERROR(fhSize, "ZSTD_writeFrameHeader failed");
assert(fhSize <= dstCapacity);
dstCapacity -= fhSize;
dst = (char*)dst + fhSize;
cctx->stage = ZSTDcs_ongoing;
}
if (!srcSize) return fhSize; /* do not generate an empty block if no input */
if (!ZSTD_window_update(&ms->window, src, srcSize, ms->forceNonContiguous)) {
ms->forceNonContiguous = 0;
ms->nextToUpdate = ms->window.dictLimit;
}
if (cctx->appliedParams.ldmParams.enableLdm == ZSTD_ps_enable) {
ZSTD_window_update(&cctx->ldmState.window, src, srcSize, /* forceNonContiguous */ 0);
}
if (!frame) {
/* overflow check and correction for block mode */
ZSTD_overflowCorrectIfNeeded(
ms, &cctx->workspace, &cctx->appliedParams,
src, (BYTE const*)src + srcSize);
}
DEBUGLOG(5, "ZSTD_compressContinue_internal (blockSize=%u)", (unsigned)cctx->blockSize);
{ size_t const cSize = frame ?
ZSTD_compress_frameChunk (cctx, dst, dstCapacity, src, srcSize, lastFrameChunk) :
ZSTD_compressBlock_internal (cctx, dst, dstCapacity, src, srcSize, 0 /* frame */);
FORWARD_IF_ERROR(cSize, "%s", frame ? "ZSTD_compress_frameChunk failed" : "ZSTD_compressBlock_internal failed");
cctx->consumedSrcSize += srcSize;
cctx->producedCSize += (cSize + fhSize);
assert(!(cctx->appliedParams.fParams.contentSizeFlag && cctx->pledgedSrcSizePlusOne == 0));
if (cctx->pledgedSrcSizePlusOne != 0) { /* control src size */
ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_UNKNOWN == (unsigned long long)-1);
RETURN_ERROR_IF(
cctx->consumedSrcSize+1 > cctx->pledgedSrcSizePlusOne,
srcSize_wrong,
"error : pledgedSrcSize = %u, while realSrcSize >= %u",
(unsigned)cctx->pledgedSrcSizePlusOne-1,
(unsigned)cctx->consumedSrcSize);
}
return cSize + fhSize;
}
}
size_t ZSTD_compressContinue_public(ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize)
{
DEBUGLOG(5, "ZSTD_compressContinue (srcSize=%u)", (unsigned)srcSize);
return ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 1 /* frame mode */, 0 /* last chunk */);
}
/* NOTE: Must just wrap ZSTD_compressContinue_public() */
size_t ZSTD_compressContinue(ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize)
{
return ZSTD_compressContinue_public(cctx, dst, dstCapacity, src, srcSize);
}
static size_t ZSTD_getBlockSize_deprecated(const ZSTD_CCtx* cctx)
{
ZSTD_compressionParameters const cParams = cctx->appliedParams.cParams;
assert(!ZSTD_checkCParams(cParams));
return MIN(cctx->appliedParams.maxBlockSize, (size_t)1 << cParams.windowLog);
}
/* NOTE: Must just wrap ZSTD_getBlockSize_deprecated() */
size_t ZSTD_getBlockSize(const ZSTD_CCtx* cctx)
{
return ZSTD_getBlockSize_deprecated(cctx);
}
/* NOTE: Must just wrap ZSTD_compressBlock_deprecated() */
size_t ZSTD_compressBlock_deprecated(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize)
{
DEBUGLOG(5, "ZSTD_compressBlock: srcSize = %u", (unsigned)srcSize);
{ size_t const blockSizeMax = ZSTD_getBlockSize_deprecated(cctx);
RETURN_ERROR_IF(srcSize > blockSizeMax, srcSize_wrong, "input is larger than a block"); }
return ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 0 /* frame mode */, 0 /* last chunk */);
}
/* NOTE: Must just wrap ZSTD_compressBlock_deprecated() */
size_t ZSTD_compressBlock(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize)
{
return ZSTD_compressBlock_deprecated(cctx, dst, dstCapacity, src, srcSize);
}
/*! ZSTD_loadDictionaryContent() :
* @return : 0, or an error code
*/
static size_t ZSTD_loadDictionaryContent(ZSTD_matchState_t* ms,
ldmState_t* ls,
ZSTD_cwksp* ws,
ZSTD_CCtx_params const* params,
const void* src, size_t srcSize,
ZSTD_dictTableLoadMethod_e dtlm,
ZSTD_tableFillPurpose_e tfp)
{
const BYTE* ip = (const BYTE*) src;
const BYTE* const iend = ip + srcSize;
int const loadLdmDict = params->ldmParams.enableLdm == ZSTD_ps_enable && ls != NULL;
/* Assert that the ms params match the params we're being given */
ZSTD_assertEqualCParams(params->cParams, ms->cParams);
{ /* Ensure large dictionaries can't cause index overflow */
/* Allow the dictionary to set indices up to exactly ZSTD_CURRENT_MAX.
* Dictionaries right at the edge will immediately trigger overflow
* correction, but I don't want to insert extra constraints here.
*/
U32 maxDictSize = ZSTD_CURRENT_MAX - ZSTD_WINDOW_START_INDEX;
int const CDictTaggedIndices = ZSTD_CDictIndicesAreTagged(&params->cParams);
if (CDictTaggedIndices && tfp == ZSTD_tfp_forCDict) {
/* Some dictionary matchfinders in zstd use "short cache",
* which treats the lower ZSTD_SHORT_CACHE_TAG_BITS of each
* CDict hashtable entry as a tag rather than as part of an index.
* When short cache is used, we need to truncate the dictionary
* so that its indices don't overlap with the tag. */
U32 const shortCacheMaxDictSize = (1u << (32 - ZSTD_SHORT_CACHE_TAG_BITS)) - ZSTD_WINDOW_START_INDEX;
maxDictSize = MIN(maxDictSize, shortCacheMaxDictSize);
assert(!loadLdmDict);
}
/* If the dictionary is too large, only load the suffix of the dictionary. */
if (srcSize > maxDictSize) {
ip = iend - maxDictSize;
src = ip;
srcSize = maxDictSize;
}
}
if (srcSize > ZSTD_CHUNKSIZE_MAX) {
/* We must have cleared our windows when our source is this large. */
assert(ZSTD_window_isEmpty(ms->window));
if (loadLdmDict) assert(ZSTD_window_isEmpty(ls->window));
}
ZSTD_window_update(&ms->window, src, srcSize, /* forceNonContiguous */ 0);
DEBUGLOG(4, "ZSTD_loadDictionaryContent(): useRowMatchFinder=%d", (int)params->useRowMatchFinder);
if (loadLdmDict) { /* Load the entire dict into LDM matchfinders. */
ZSTD_window_update(&ls->window, src, srcSize, /* forceNonContiguous */ 0);
ls->loadedDictEnd = params->forceWindow ? 0 : (U32)(iend - ls->window.base);
ZSTD_ldm_fillHashTable(ls, ip, iend, &params->ldmParams);
}
/* If the dict is larger than we can reasonably index in our tables, only load the suffix. */
if (params->cParams.strategy < ZSTD_btultra) {
U32 maxDictSize = 8U << MIN(MAX(params->cParams.hashLog, params->cParams.chainLog), 28);
if (srcSize > maxDictSize) {
ip = iend - maxDictSize;
src = ip;
srcSize = maxDictSize;
}
}
ms->nextToUpdate = (U32)(ip - ms->window.base);
ms->loadedDictEnd = params->forceWindow ? 0 : (U32)(iend - ms->window.base);
ms->forceNonContiguous = params->deterministicRefPrefix;
if (srcSize <= HASH_READ_SIZE) return 0;
ZSTD_overflowCorrectIfNeeded(ms, ws, params, ip, iend);
switch(params->cParams.strategy)
{
case ZSTD_fast:
ZSTD_fillHashTable(ms, iend, dtlm, tfp);
break;
case ZSTD_dfast:
#ifndef ZSTD_EXCLUDE_DFAST_BLOCK_COMPRESSOR
ZSTD_fillDoubleHashTable(ms, iend, dtlm, tfp);
#else
assert(0); /* shouldn't be called: cparams should've been adjusted. */
#endif
break;
case ZSTD_greedy:
case ZSTD_lazy:
case ZSTD_lazy2:
#if !defined(ZSTD_EXCLUDE_GREEDY_BLOCK_COMPRESSOR) \
|| !defined(ZSTD_EXCLUDE_LAZY_BLOCK_COMPRESSOR) \
|| !defined(ZSTD_EXCLUDE_LAZY2_BLOCK_COMPRESSOR)
assert(srcSize >= HASH_READ_SIZE);
if (ms->dedicatedDictSearch) {
assert(ms->chainTable != NULL);
ZSTD_dedicatedDictSearch_lazy_loadDictionary(ms, iend-HASH_READ_SIZE);
} else {
assert(params->useRowMatchFinder != ZSTD_ps_auto);
if (params->useRowMatchFinder == ZSTD_ps_enable) {
size_t const tagTableSize = ((size_t)1 << params->cParams.hashLog);
ZSTD_memset(ms->tagTable, 0, tagTableSize);
ZSTD_row_update(ms, iend-HASH_READ_SIZE);
DEBUGLOG(4, "Using row-based hash table for lazy dict");
} else {
ZSTD_insertAndFindFirstIndex(ms, iend-HASH_READ_SIZE);
DEBUGLOG(4, "Using chain-based hash table for lazy dict");
}
}
#else
assert(0); /* shouldn't be called: cparams should've been adjusted. */
#endif
break;
case ZSTD_btlazy2: /* we want the dictionary table fully sorted */
case ZSTD_btopt:
case ZSTD_btultra:
case ZSTD_btultra2:
#if !defined(ZSTD_EXCLUDE_BTLAZY2_BLOCK_COMPRESSOR) \
|| !defined(ZSTD_EXCLUDE_BTOPT_BLOCK_COMPRESSOR) \
|| !defined(ZSTD_EXCLUDE_BTULTRA_BLOCK_COMPRESSOR)
assert(srcSize >= HASH_READ_SIZE);
ZSTD_updateTree(ms, iend-HASH_READ_SIZE, iend);
#else
assert(0); /* shouldn't be called: cparams should've been adjusted. */
#endif
break;
default:
assert(0); /* not possible : not a valid strategy id */
}
ms->nextToUpdate = (U32)(iend - ms->window.base);
return 0;
}
/* Dictionaries that assign zero probability to symbols that show up causes problems
* when FSE encoding. Mark dictionaries with zero probability symbols as FSE_repeat_check
* and only dictionaries with 100% valid symbols can be assumed valid.
*/
static FSE_repeat ZSTD_dictNCountRepeat(short* normalizedCounter, unsigned dictMaxSymbolValue, unsigned maxSymbolValue)
{
U32 s;
if (dictMaxSymbolValue < maxSymbolValue) {
return FSE_repeat_check;
}
for (s = 0; s <= maxSymbolValue; ++s) {
if (normalizedCounter[s] == 0) {
return FSE_repeat_check;
}
}
return FSE_repeat_valid;
}
size_t ZSTD_loadCEntropy(ZSTD_compressedBlockState_t* bs, void* workspace,
const void* const dict, size_t dictSize)
{
short offcodeNCount[MaxOff+1];
unsigned offcodeMaxValue = MaxOff;
const BYTE* dictPtr = (const BYTE*)dict; /* skip magic num and dict ID */
const BYTE* const dictEnd = dictPtr + dictSize;
dictPtr += 8;
bs->entropy.huf.repeatMode = HUF_repeat_check;
{ unsigned maxSymbolValue = 255;
unsigned hasZeroWeights = 1;
size_t const hufHeaderSize = HUF_readCTable((HUF_CElt*)bs->entropy.huf.CTable, &maxSymbolValue, dictPtr,
dictEnd-dictPtr, &hasZeroWeights);
/* We only set the loaded table as valid if it contains all non-zero
* weights. Otherwise, we set it to check */
if (!hasZeroWeights && maxSymbolValue == 255)
bs->entropy.huf.repeatMode = HUF_repeat_valid;
RETURN_ERROR_IF(HUF_isError(hufHeaderSize), dictionary_corrupted, "");
dictPtr += hufHeaderSize;
}
{ unsigned offcodeLog;
size_t const offcodeHeaderSize = FSE_readNCount(offcodeNCount, &offcodeMaxValue, &offcodeLog, dictPtr, dictEnd-dictPtr);
RETURN_ERROR_IF(FSE_isError(offcodeHeaderSize), dictionary_corrupted, "");
RETURN_ERROR_IF(offcodeLog > OffFSELog, dictionary_corrupted, "");
/* fill all offset symbols to avoid garbage at end of table */
RETURN_ERROR_IF(FSE_isError(FSE_buildCTable_wksp(
bs->entropy.fse.offcodeCTable,
offcodeNCount, MaxOff, offcodeLog,
workspace, HUF_WORKSPACE_SIZE)),
dictionary_corrupted, "");
/* Defer checking offcodeMaxValue because we need to know the size of the dictionary content */
dictPtr += offcodeHeaderSize;
}
{ short matchlengthNCount[MaxML+1];
unsigned matchlengthMaxValue = MaxML, matchlengthLog;
size_t const matchlengthHeaderSize = FSE_readNCount(matchlengthNCount, &matchlengthMaxValue, &matchlengthLog, dictPtr, dictEnd-dictPtr);
RETURN_ERROR_IF(FSE_isError(matchlengthHeaderSize), dictionary_corrupted, "");
RETURN_ERROR_IF(matchlengthLog > MLFSELog, dictionary_corrupted, "");
RETURN_ERROR_IF(FSE_isError(FSE_buildCTable_wksp(
bs->entropy.fse.matchlengthCTable,
matchlengthNCount, matchlengthMaxValue, matchlengthLog,
workspace, HUF_WORKSPACE_SIZE)),
dictionary_corrupted, "");
bs->entropy.fse.matchlength_repeatMode = ZSTD_dictNCountRepeat(matchlengthNCount, matchlengthMaxValue, MaxML);
dictPtr += matchlengthHeaderSize;
}
{ short litlengthNCount[MaxLL+1];
unsigned litlengthMaxValue = MaxLL, litlengthLog;
size_t const litlengthHeaderSize = FSE_readNCount(litlengthNCount, &litlengthMaxValue, &litlengthLog, dictPtr, dictEnd-dictPtr);
RETURN_ERROR_IF(FSE_isError(litlengthHeaderSize), dictionary_corrupted, "");
RETURN_ERROR_IF(litlengthLog > LLFSELog, dictionary_corrupted, "");
RETURN_ERROR_IF(FSE_isError(FSE_buildCTable_wksp(
bs->entropy.fse.litlengthCTable,
litlengthNCount, litlengthMaxValue, litlengthLog,
workspace, HUF_WORKSPACE_SIZE)),
dictionary_corrupted, "");
bs->entropy.fse.litlength_repeatMode = ZSTD_dictNCountRepeat(litlengthNCount, litlengthMaxValue, MaxLL);
dictPtr += litlengthHeaderSize;
}
RETURN_ERROR_IF(dictPtr+12 > dictEnd, dictionary_corrupted, "");
bs->rep[0] = MEM_readLE32(dictPtr+0);
bs->rep[1] = MEM_readLE32(dictPtr+4);
bs->rep[2] = MEM_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 for a valid table */
bs->entropy.fse.offcode_repeatMode = ZSTD_dictNCountRepeat(offcodeNCount, offcodeMaxValue, MIN(offcodeMax, MaxOff));
/* All repCodes must be <= dictContentSize and != 0 */
{ U32 u;
for (u=0; u<3; u++) {
RETURN_ERROR_IF(bs->rep[u] == 0, dictionary_corrupted, "");
RETURN_ERROR_IF(bs->rep[u] > dictContentSize, dictionary_corrupted, "");
} } }
return dictPtr - (const BYTE*)dict;
}
/* Dictionary format :
* See :
* https://github.com/facebook/zstd/blob/release/doc/zstd_compression_format.md#dictionary-format
*/
/*! ZSTD_loadZstdDictionary() :
* @return : dictID, or an error code
* assumptions : magic number supposed already checked
* dictSize supposed >= 8
*/
static size_t ZSTD_loadZstdDictionary(ZSTD_compressedBlockState_t* bs,
ZSTD_matchState_t* ms,
ZSTD_cwksp* ws,
ZSTD_CCtx_params const* params,
const void* dict, size_t dictSize,
ZSTD_dictTableLoadMethod_e dtlm,
ZSTD_tableFillPurpose_e tfp,
void* workspace)
{
const BYTE* dictPtr = (const BYTE*)dict;
const BYTE* const dictEnd = dictPtr + dictSize;
size_t dictID;
size_t eSize;
ZSTD_STATIC_ASSERT(HUF_WORKSPACE_SIZE >= (1<<MAX(MLFSELog,LLFSELog)));
assert(dictSize >= 8);
assert(MEM_readLE32(dictPtr) == ZSTD_MAGIC_DICTIONARY);
dictID = params->fParams.noDictIDFlag ? 0 : MEM_readLE32(dictPtr + 4 /* skip magic number */ );
eSize = ZSTD_loadCEntropy(bs, workspace, dict, dictSize);
FORWARD_IF_ERROR(eSize, "ZSTD_loadCEntropy failed");
dictPtr += eSize;
{
size_t const dictContentSize = (size_t)(dictEnd - dictPtr);
FORWARD_IF_ERROR(ZSTD_loadDictionaryContent(
ms, NULL, ws, params, dictPtr, dictContentSize, dtlm, tfp), "");
}
return dictID;
}
/** ZSTD_compress_insertDictionary() :
* @return : dictID, or an error code */
static size_t
ZSTD_compress_insertDictionary(ZSTD_compressedBlockState_t* bs,
ZSTD_matchState_t* ms,
ldmState_t* ls,
ZSTD_cwksp* ws,
const ZSTD_CCtx_params* params,
const void* dict, size_t dictSize,
ZSTD_dictContentType_e dictContentType,
ZSTD_dictTableLoadMethod_e dtlm,
ZSTD_tableFillPurpose_e tfp,
void* workspace)
{
DEBUGLOG(4, "ZSTD_compress_insertDictionary (dictSize=%u)", (U32)dictSize);
if ((dict==NULL) || (dictSize<8)) {
RETURN_ERROR_IF(dictContentType == ZSTD_dct_fullDict, dictionary_wrong, "");
return 0;
}
ZSTD_reset_compressedBlockState(bs);
/* dict restricted modes */
if (dictContentType == ZSTD_dct_rawContent)
return ZSTD_loadDictionaryContent(ms, ls, ws, params, dict, dictSize, dtlm, tfp);
if (MEM_readLE32(dict) != ZSTD_MAGIC_DICTIONARY) {
if (dictContentType == ZSTD_dct_auto) {
DEBUGLOG(4, "raw content dictionary detected");
return ZSTD_loadDictionaryContent(
ms, ls, ws, params, dict, dictSize, dtlm, tfp);
}
RETURN_ERROR_IF(dictContentType == ZSTD_dct_fullDict, dictionary_wrong, "");
assert(0); /* impossible */
}
/* dict as full zstd dictionary */
return ZSTD_loadZstdDictionary(
bs, ms, ws, params, dict, dictSize, dtlm, tfp, workspace);
}
#define ZSTD_USE_CDICT_PARAMS_SRCSIZE_CUTOFF (128 KB)
#define ZSTD_USE_CDICT_PARAMS_DICTSIZE_MULTIPLIER (6ULL)
/*! ZSTD_compressBegin_internal() :
* Assumption : either @dict OR @cdict (or none) is non-NULL, never both
* @return : 0, or an error code */
static size_t ZSTD_compressBegin_internal(ZSTD_CCtx* cctx,
const void* dict, size_t dictSize,
ZSTD_dictContentType_e dictContentType,
ZSTD_dictTableLoadMethod_e dtlm,
const ZSTD_CDict* cdict,
const ZSTD_CCtx_params* params, U64 pledgedSrcSize,
ZSTD_buffered_policy_e zbuff)
{
size_t const dictContentSize = cdict ? cdict->dictContentSize : dictSize;
#if ZSTD_TRACE
cctx->traceCtx = (ZSTD_trace_compress_begin != NULL) ? ZSTD_trace_compress_begin(cctx) : 0;
#endif
DEBUGLOG(4, "ZSTD_compressBegin_internal: wlog=%u", params->cParams.windowLog);
/* params are supposed to be fully validated at this point */
assert(!ZSTD_isError(ZSTD_checkCParams(params->cParams)));
assert(!((dict) && (cdict))); /* either dict or cdict, not both */
if ( (cdict)
&& (cdict->dictContentSize > 0)
&& ( pledgedSrcSize < ZSTD_USE_CDICT_PARAMS_SRCSIZE_CUTOFF
|| pledgedSrcSize < cdict->dictContentSize * ZSTD_USE_CDICT_PARAMS_DICTSIZE_MULTIPLIER
|| pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN
|| cdict->compressionLevel == 0)
&& (params->attachDictPref != ZSTD_dictForceLoad) ) {
return ZSTD_resetCCtx_usingCDict(cctx, cdict, params, pledgedSrcSize, zbuff);
}
FORWARD_IF_ERROR( ZSTD_resetCCtx_internal(cctx, params, pledgedSrcSize,
dictContentSize,
ZSTDcrp_makeClean, zbuff) , "");
{ size_t const dictID = cdict ?
ZSTD_compress_insertDictionary(
cctx->blockState.prevCBlock, &cctx->blockState.matchState,
&cctx->ldmState, &cctx->workspace, &cctx->appliedParams, cdict->dictContent,
cdict->dictContentSize, cdict->dictContentType, dtlm,
ZSTD_tfp_forCCtx, cctx->entropyWorkspace)
: ZSTD_compress_insertDictionary(
cctx->blockState.prevCBlock, &cctx->blockState.matchState,
&cctx->ldmState, &cctx->workspace, &cctx->appliedParams, dict, dictSize,
dictContentType, dtlm, ZSTD_tfp_forCCtx, cctx->entropyWorkspace);
FORWARD_IF_ERROR(dictID, "ZSTD_compress_insertDictionary failed");
assert(dictID <= UINT_MAX);
cctx->dictID = (U32)dictID;
cctx->dictContentSize = dictContentSize;
}
return 0;
}
size_t ZSTD_compressBegin_advanced_internal(ZSTD_CCtx* cctx,
const void* dict, size_t dictSize,
ZSTD_dictContentType_e dictContentType,
ZSTD_dictTableLoadMethod_e dtlm,
const ZSTD_CDict* cdict,
const ZSTD_CCtx_params* params,
unsigned long long pledgedSrcSize)
{
DEBUGLOG(4, "ZSTD_compressBegin_advanced_internal: wlog=%u", params->cParams.windowLog);
/* compression parameters verification and optimization */
FORWARD_IF_ERROR( ZSTD_checkCParams(params->cParams) , "");
return ZSTD_compressBegin_internal(cctx,
dict, dictSize, dictContentType, dtlm,
cdict,
params, pledgedSrcSize,
ZSTDb_not_buffered);
}
/*! 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)
{
ZSTD_CCtx_params cctxParams;
ZSTD_CCtxParams_init_internal(&cctxParams, &params, ZSTD_NO_CLEVEL);
return ZSTD_compressBegin_advanced_internal(cctx,
dict, dictSize, ZSTD_dct_auto, ZSTD_dtlm_fast,
NULL /*cdict*/,
&cctxParams, pledgedSrcSize);
}
static size_t
ZSTD_compressBegin_usingDict_deprecated(ZSTD_CCtx* cctx, const void* dict, size_t dictSize, int compressionLevel)
{
ZSTD_CCtx_params cctxParams;
{ ZSTD_parameters const params = ZSTD_getParams_internal(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_noAttachDict);
ZSTD_CCtxParams_init_internal(&cctxParams, &params, (compressionLevel == 0) ? ZSTD_CLEVEL_DEFAULT : compressionLevel);
}
DEBUGLOG(4, "ZSTD_compressBegin_usingDict (dictSize=%u)", (unsigned)dictSize);
return ZSTD_compressBegin_internal(cctx, dict, dictSize, ZSTD_dct_auto, ZSTD_dtlm_fast, NULL,
&cctxParams, ZSTD_CONTENTSIZE_UNKNOWN, ZSTDb_not_buffered);
}
size_t
ZSTD_compressBegin_usingDict(ZSTD_CCtx* cctx, const void* dict, size_t dictSize, int compressionLevel)
{
return ZSTD_compressBegin_usingDict_deprecated(cctx, dict, dictSize, compressionLevel);
}
size_t ZSTD_compressBegin(ZSTD_CCtx* cctx, int compressionLevel)
{
return ZSTD_compressBegin_usingDict_deprecated(cctx, NULL, 0, compressionLevel);
}
/*! 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;
DEBUGLOG(4, "ZSTD_writeEpilogue");
RETURN_ERROR_IF(cctx->stage == ZSTDcs_created, stage_wrong, "init missing");
/* special case : empty frame */
if (cctx->stage == ZSTDcs_init) {
size_t fhSize = ZSTD_writeFrameHeader(dst, dstCapacity, &cctx->appliedParams, 0, 0);
FORWARD_IF_ERROR(fhSize, "ZSTD_writeFrameHeader failed");
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;
ZSTD_STATIC_ASSERT(ZSTD_BLOCKHEADERSIZE == 3);
RETURN_ERROR_IF(dstCapacity<3, dstSize_tooSmall, "no room for epilogue");
MEM_writeLE24(op, cBlockHeader24);
op += ZSTD_blockHeaderSize;
dstCapacity -= ZSTD_blockHeaderSize;
}
if (cctx->appliedParams.fParams.checksumFlag) {
U32 const checksum = (U32) XXH64_digest(&cctx->xxhState);
RETURN_ERROR_IF(dstCapacity<4, dstSize_tooSmall, "no room for checksum");
DEBUGLOG(4, "ZSTD_writeEpilogue: write checksum : %08X", (unsigned)checksum);
MEM_writeLE32(op, checksum);
op += 4;
}
cctx->stage = ZSTDcs_created; /* return to "created but no init" status */
return op-ostart;
}
void ZSTD_CCtx_trace(ZSTD_CCtx* cctx, size_t extraCSize)
{
#if ZSTD_TRACE
if (cctx->traceCtx && ZSTD_trace_compress_end != NULL) {
int const streaming = cctx->inBuffSize > 0 || cctx->outBuffSize > 0 || cctx->appliedParams.nbWorkers > 0;
ZSTD_Trace trace;
ZSTD_memset(&trace, 0, sizeof(trace));
trace.version = ZSTD_VERSION_NUMBER;
trace.streaming = streaming;
trace.dictionaryID = cctx->dictID;
trace.dictionarySize = cctx->dictContentSize;
trace.uncompressedSize = cctx->consumedSrcSize;
trace.compressedSize = cctx->producedCSize + extraCSize;
trace.params = &cctx->appliedParams;
trace.cctx = cctx;
ZSTD_trace_compress_end(cctx->traceCtx, &trace);
}
cctx->traceCtx = 0;
#else
(void)cctx;
(void)extraCSize;
#endif
}
size_t ZSTD_compressEnd_public(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 /* frame mode */, 1 /* last chunk */);
FORWARD_IF_ERROR(cSize, "ZSTD_compressContinue_internal failed");
endResult = ZSTD_writeEpilogue(cctx, (char*)dst + cSize, dstCapacity-cSize);
FORWARD_IF_ERROR(endResult, "ZSTD_writeEpilogue failed");
assert(!(cctx->appliedParams.fParams.contentSizeFlag && cctx->pledgedSrcSizePlusOne == 0));
if (cctx->pledgedSrcSizePlusOne != 0) { /* control src size */
ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_UNKNOWN == (unsigned long long)-1);
DEBUGLOG(4, "end of frame : controlling src size");
RETURN_ERROR_IF(
cctx->pledgedSrcSizePlusOne != cctx->consumedSrcSize+1,
srcSize_wrong,
"error : pledgedSrcSize = %u, while realSrcSize = %u",
(unsigned)cctx->pledgedSrcSizePlusOne-1,
(unsigned)cctx->consumedSrcSize);
}
ZSTD_CCtx_trace(cctx, endResult);
return cSize + endResult;
}
/* NOTE: Must just wrap ZSTD_compressEnd_public() */
size_t ZSTD_compressEnd(ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize)
{
return ZSTD_compressEnd_public(cctx, dst, dstCapacity, src, srcSize);
}
size_t ZSTD_compress_advanced (ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
const void* dict,size_t dictSize,
ZSTD_parameters params)
{
DEBUGLOG(4, "ZSTD_compress_advanced");
FORWARD_IF_ERROR(ZSTD_checkCParams(params.cParams), "");
ZSTD_CCtxParams_init_internal(&cctx->simpleApiParams, &params, ZSTD_NO_CLEVEL);
return ZSTD_compress_advanced_internal(cctx,
dst, dstCapacity,
src, srcSize,
dict, dictSize,
&cctx->simpleApiParams);
}
/* Internal */
size_t ZSTD_compress_advanced_internal(
ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
const void* dict,size_t dictSize,
const ZSTD_CCtx_params* params)
{
DEBUGLOG(4, "ZSTD_compress_advanced_internal (srcSize:%u)", (unsigned)srcSize);
FORWARD_IF_ERROR( ZSTD_compressBegin_internal(cctx,
dict, dictSize, ZSTD_dct_auto, ZSTD_dtlm_fast, NULL,
params, srcSize, ZSTDb_not_buffered) , "");
return ZSTD_compressEnd_public(cctx, dst, dstCapacity, src, srcSize);
}
size_t ZSTD_compress_usingDict(ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
const void* dict, size_t dictSize,
int compressionLevel)
{
{
ZSTD_parameters const params = ZSTD_getParams_internal(compressionLevel, srcSize, dict ? dictSize : 0, ZSTD_cpm_noAttachDict);
assert(params.fParams.contentSizeFlag == 1);
ZSTD_CCtxParams_init_internal(&cctx->simpleApiParams, &params, (compressionLevel == 0) ? ZSTD_CLEVEL_DEFAULT: compressionLevel);
}
DEBUGLOG(4, "ZSTD_compress_usingDict (srcSize=%u)", (unsigned)srcSize);
return ZSTD_compress_advanced_internal(cctx, dst, dstCapacity, src, srcSize, dict, dictSize, &cctx->simpleApiParams);
}
size_t ZSTD_compressCCtx(ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
int compressionLevel)
{
DEBUGLOG(4, "ZSTD_compressCCtx (srcSize=%u)", (unsigned)srcSize);
assert(cctx != NULL);
return ZSTD_compress_usingDict(cctx, dst, dstCapacity, src, srcSize, NULL, 0, compressionLevel);
}
size_t ZSTD_compress(void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
int compressionLevel)
{
size_t result;
#if ZSTD_COMPRESS_HEAPMODE
ZSTD_CCtx* cctx = ZSTD_createCCtx();
RETURN_ERROR_IF(!cctx, memory_allocation, "ZSTD_createCCtx failed");
result = ZSTD_compressCCtx(cctx, dst, dstCapacity, src, srcSize, compressionLevel);
ZSTD_freeCCtx(cctx);
#else
ZSTD_CCtx ctxBody;
ZSTD_initCCtx(&ctxBody, ZSTD_defaultCMem);
result = ZSTD_compressCCtx(&ctxBody, dst, dstCapacity, src, srcSize, compressionLevel);
ZSTD_freeCCtxContent(&ctxBody); /* can't free ctxBody itself, as it's on stack; free only heap content */
#endif
return result;
}
/* ===== Dictionary API ===== */
/*! ZSTD_estimateCDictSize_advanced() :
* Estimate amount of memory that will be needed to create a dictionary with following arguments */
size_t ZSTD_estimateCDictSize_advanced(
size_t dictSize, ZSTD_compressionParameters cParams,
ZSTD_dictLoadMethod_e dictLoadMethod)
{
DEBUGLOG(5, "sizeof(ZSTD_CDict) : %u", (unsigned)sizeof(ZSTD_CDict));
return ZSTD_cwksp_alloc_size(sizeof(ZSTD_CDict))
+ ZSTD_cwksp_alloc_size(HUF_WORKSPACE_SIZE)
/* enableDedicatedDictSearch == 1 ensures that CDict estimation will not be too small
* in case we are using DDS with row-hash. */
+ ZSTD_sizeof_matchState(&cParams, ZSTD_resolveRowMatchFinderMode(ZSTD_ps_auto, &cParams),
/* enableDedicatedDictSearch */ 1, /* forCCtx */ 0)
+ (dictLoadMethod == ZSTD_dlm_byRef ? 0
: ZSTD_cwksp_alloc_size(ZSTD_cwksp_align(dictSize, sizeof(void *))));
}
size_t ZSTD_estimateCDictSize(size_t dictSize, int compressionLevel)
{
ZSTD_compressionParameters const cParams = ZSTD_getCParams_internal(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_createCDict);
return ZSTD_estimateCDictSize_advanced(dictSize, cParams, ZSTD_dlm_byCopy);
}
size_t ZSTD_sizeof_CDict(const ZSTD_CDict* cdict)
{
if (cdict==NULL) return 0; /* support sizeof on NULL */
DEBUGLOG(5, "sizeof(*cdict) : %u", (unsigned)sizeof(*cdict));
/* cdict may be in the workspace */
return (cdict->workspace.workspace == cdict ? 0 : sizeof(*cdict))
+ ZSTD_cwksp_sizeof(&cdict->workspace);
}
static size_t ZSTD_initCDict_internal(
ZSTD_CDict* cdict,
const void* dictBuffer, size_t dictSize,
ZSTD_dictLoadMethod_e dictLoadMethod,
ZSTD_dictContentType_e dictContentType,
ZSTD_CCtx_params params)
{
DEBUGLOG(3, "ZSTD_initCDict_internal (dictContentType:%u)", (unsigned)dictContentType);
assert(!ZSTD_checkCParams(params.cParams));
cdict->matchState.cParams = params.cParams;
cdict->matchState.dedicatedDictSearch = params.enableDedicatedDictSearch;
if ((dictLoadMethod == ZSTD_dlm_byRef) || (!dictBuffer) || (!dictSize)) {
cdict->dictContent = dictBuffer;
} else {
void *internalBuffer = ZSTD_cwksp_reserve_object(&cdict->workspace, ZSTD_cwksp_align(dictSize, sizeof(void*)));
RETURN_ERROR_IF(!internalBuffer, memory_allocation, "NULL pointer!");
cdict->dictContent = internalBuffer;
ZSTD_memcpy(internalBuffer, dictBuffer, dictSize);
}
cdict->dictContentSize = dictSize;
cdict->dictContentType = dictContentType;
cdict->entropyWorkspace = (U32*)ZSTD_cwksp_reserve_object(&cdict->workspace, HUF_WORKSPACE_SIZE);
/* Reset the state to no dictionary */
ZSTD_reset_compressedBlockState(&cdict->cBlockState);
FORWARD_IF_ERROR(ZSTD_reset_matchState(
&cdict->matchState,
&cdict->workspace,
&params.cParams,
params.useRowMatchFinder,
ZSTDcrp_makeClean,
ZSTDirp_reset,
ZSTD_resetTarget_CDict), "");
/* (Maybe) load the dictionary
* Skips loading the dictionary if it is < 8 bytes.
*/
{ params.compressionLevel = ZSTD_CLEVEL_DEFAULT;
params.fParams.contentSizeFlag = 1;
{ size_t const dictID = ZSTD_compress_insertDictionary(
&cdict->cBlockState, &cdict->matchState, NULL, &cdict->workspace,
&params, cdict->dictContent, cdict->dictContentSize,
dictContentType, ZSTD_dtlm_full, ZSTD_tfp_forCDict, cdict->entropyWorkspace);
FORWARD_IF_ERROR(dictID, "ZSTD_compress_insertDictionary failed");
assert(dictID <= (size_t)(U32)-1);
cdict->dictID = (U32)dictID;
}
}
return 0;
}
static ZSTD_CDict* ZSTD_createCDict_advanced_internal(size_t dictSize,
ZSTD_dictLoadMethod_e dictLoadMethod,
ZSTD_compressionParameters cParams,
ZSTD_paramSwitch_e useRowMatchFinder,
U32 enableDedicatedDictSearch,
ZSTD_customMem customMem)
{
if ((!customMem.customAlloc) ^ (!customMem.customFree)) return NULL;
{ size_t const workspaceSize =
ZSTD_cwksp_alloc_size(sizeof(ZSTD_CDict)) +
ZSTD_cwksp_alloc_size(HUF_WORKSPACE_SIZE) +
ZSTD_sizeof_matchState(&cParams, useRowMatchFinder, enableDedicatedDictSearch, /* forCCtx */ 0) +
(dictLoadMethod == ZSTD_dlm_byRef ? 0
: ZSTD_cwksp_alloc_size(ZSTD_cwksp_align(dictSize, sizeof(void*))));
void* const workspace = ZSTD_customMalloc(workspaceSize, customMem);
ZSTD_cwksp ws;
ZSTD_CDict* cdict;
if (!workspace) {
ZSTD_customFree(workspace, customMem);
return NULL;
}
ZSTD_cwksp_init(&ws, workspace, workspaceSize, ZSTD_cwksp_dynamic_alloc);
cdict = (ZSTD_CDict*)ZSTD_cwksp_reserve_object(&ws, sizeof(ZSTD_CDict));
assert(cdict != NULL);
ZSTD_cwksp_move(&cdict->workspace, &ws);
cdict->customMem = customMem;
cdict->compressionLevel = ZSTD_NO_CLEVEL; /* signals advanced API usage */
cdict->useRowMatchFinder = useRowMatchFinder;
return cdict;
}
}
ZSTD_CDict* ZSTD_createCDict_advanced(const void* dictBuffer, size_t dictSize,
ZSTD_dictLoadMethod_e dictLoadMethod,
ZSTD_dictContentType_e dictContentType,
ZSTD_compressionParameters cParams,
ZSTD_customMem customMem)
{
ZSTD_CCtx_params cctxParams;
ZSTD_memset(&cctxParams, 0, sizeof(cctxParams));
ZSTD_CCtxParams_init(&cctxParams, 0);
cctxParams.cParams = cParams;
cctxParams.customMem = customMem;
return ZSTD_createCDict_advanced2(
dictBuffer, dictSize,
dictLoadMethod, dictContentType,
&cctxParams, customMem);
}
ZSTD_CDict* ZSTD_createCDict_advanced2(
const void* dict, size_t dictSize,
ZSTD_dictLoadMethod_e dictLoadMethod,
ZSTD_dictContentType_e dictContentType,
const ZSTD_CCtx_params* originalCctxParams,
ZSTD_customMem customMem)
{
ZSTD_CCtx_params cctxParams = *originalCctxParams;
ZSTD_compressionParameters cParams;
ZSTD_CDict* cdict;
DEBUGLOG(3, "ZSTD_createCDict_advanced2, mode %u", (unsigned)dictContentType);
if (!customMem.customAlloc ^ !customMem.customFree) return NULL;
if (cctxParams.enableDedicatedDictSearch) {
cParams = ZSTD_dedicatedDictSearch_getCParams(
cctxParams.compressionLevel, dictSize);
ZSTD_overrideCParams(&cParams, &cctxParams.cParams);
} else {
cParams = ZSTD_getCParamsFromCCtxParams(
&cctxParams, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_createCDict);
}
if (!ZSTD_dedicatedDictSearch_isSupported(&cParams)) {
/* Fall back to non-DDSS params */
cctxParams.enableDedicatedDictSearch = 0;
cParams = ZSTD_getCParamsFromCCtxParams(
&cctxParams, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_createCDict);
}
DEBUGLOG(3, "ZSTD_createCDict_advanced2: DDS: %u", cctxParams.enableDedicatedDictSearch);
cctxParams.cParams = cParams;
cctxParams.useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(cctxParams.useRowMatchFinder, &cParams);
cdict = ZSTD_createCDict_advanced_internal(dictSize,
dictLoadMethod, cctxParams.cParams,
cctxParams.useRowMatchFinder, cctxParams.enableDedicatedDictSearch,
customMem);
if (!cdict || ZSTD_isError( ZSTD_initCDict_internal(cdict,
dict, dictSize,
dictLoadMethod, dictContentType,
cctxParams) )) {
ZSTD_freeCDict(cdict);
return NULL;
}
return cdict;
}
ZSTD_CDict* ZSTD_createCDict(const void* dict, size_t dictSize, int compressionLevel)
{
ZSTD_compressionParameters cParams = ZSTD_getCParams_internal(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_createCDict);
ZSTD_CDict* const cdict = ZSTD_createCDict_advanced(dict, dictSize,
ZSTD_dlm_byCopy, ZSTD_dct_auto,
cParams, ZSTD_defaultCMem);
if (cdict)
cdict->compressionLevel = (compressionLevel == 0) ? ZSTD_CLEVEL_DEFAULT : compressionLevel;
return cdict;
}
ZSTD_CDict* ZSTD_createCDict_byReference(const void* dict, size_t dictSize, int compressionLevel)
{
ZSTD_compressionParameters cParams = ZSTD_getCParams_internal(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_createCDict);
ZSTD_CDict* const cdict = ZSTD_createCDict_advanced(dict, dictSize,
ZSTD_dlm_byRef, ZSTD_dct_auto,
cParams, ZSTD_defaultCMem);
if (cdict)
cdict->compressionLevel = (compressionLevel == 0) ? ZSTD_CLEVEL_DEFAULT : compressionLevel;
return cdict;
}
size_t ZSTD_freeCDict(ZSTD_CDict* cdict)
{
if (cdict==NULL) return 0; /* support free on NULL */
{ ZSTD_customMem const cMem = cdict->customMem;
int cdictInWorkspace = ZSTD_cwksp_owns_buffer(&cdict->workspace, cdict);
ZSTD_cwksp_free(&cdict->workspace, cMem);
if (!cdictInWorkspace) {
ZSTD_customFree(cdict, cMem);
}
return 0;
}
}
/*! ZSTD_initStaticCDict_advanced() :
* Generate a digested dictionary in provided memory area.
* workspace: The memory area to emplace the dictionary into.
* Provided pointer must 8-bytes aligned.
* It must outlive dictionary usage.
* workspaceSize: Use ZSTD_estimateCDictSize()
* to determine how large workspace must be.
* cParams : use ZSTD_getCParams() to transform a compression level
* into its relevants cParams.
* @return : pointer to ZSTD_CDict*, or NULL if error (size too small)
* Note : there is no corresponding "free" function.
* Since workspace was allocated externally, it must be freed externally.
*/
const ZSTD_CDict* ZSTD_initStaticCDict(
void* workspace, size_t workspaceSize,
const void* dict, size_t dictSize,
ZSTD_dictLoadMethod_e dictLoadMethod,
ZSTD_dictContentType_e dictContentType,
ZSTD_compressionParameters cParams)
{
ZSTD_paramSwitch_e const useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(ZSTD_ps_auto, &cParams);
/* enableDedicatedDictSearch == 1 ensures matchstate is not too small in case this CDict will be used for DDS + row hash */
size_t const matchStateSize = ZSTD_sizeof_matchState(&cParams, useRowMatchFinder, /* enableDedicatedDictSearch */ 1, /* forCCtx */ 0);
size_t const neededSize = ZSTD_cwksp_alloc_size(sizeof(ZSTD_CDict))
+ (dictLoadMethod == ZSTD_dlm_byRef ? 0
: ZSTD_cwksp_alloc_size(ZSTD_cwksp_align(dictSize, sizeof(void*))))
+ ZSTD_cwksp_alloc_size(HUF_WORKSPACE_SIZE)
+ matchStateSize;
ZSTD_CDict* cdict;
ZSTD_CCtx_params params;
if ((size_t)workspace & 7) return NULL; /* 8-aligned */
{
ZSTD_cwksp ws;
ZSTD_cwksp_init(&ws, workspace, workspaceSize, ZSTD_cwksp_static_alloc);
cdict = (ZSTD_CDict*)ZSTD_cwksp_reserve_object(&ws, sizeof(ZSTD_CDict));
if (cdict == NULL) return NULL;
ZSTD_cwksp_move(&cdict->workspace, &ws);
}
DEBUGLOG(4, "(workspaceSize < neededSize) : (%u < %u) => %u",
(unsigned)workspaceSize, (unsigned)neededSize, (unsigned)(workspaceSize < neededSize));
if (workspaceSize < neededSize) return NULL;
ZSTD_CCtxParams_init(&params, 0);
params.cParams = cParams;
params.useRowMatchFinder = useRowMatchFinder;
cdict->useRowMatchFinder = useRowMatchFinder;
cdict->compressionLevel = ZSTD_NO_CLEVEL;
if (ZSTD_isError( ZSTD_initCDict_internal(cdict,
dict, dictSize,
dictLoadMethod, dictContentType,
params) ))
return NULL;
return cdict;
}
ZSTD_compressionParameters ZSTD_getCParamsFromCDict(const ZSTD_CDict* cdict)
{
assert(cdict != NULL);
return cdict->matchState.cParams;
}
/*! ZSTD_getDictID_fromCDict() :
* Provides the dictID of the dictionary loaded into `cdict`.
* If @return == 0, the dictionary is not conformant to Zstandard specification, or empty.
* Non-conformant dictionaries can still be loaded, but as content-only dictionaries. */
unsigned ZSTD_getDictID_fromCDict(const ZSTD_CDict* cdict)
{
if (cdict==NULL) return 0;
return cdict->dictID;
}
/* ZSTD_compressBegin_usingCDict_internal() :
* Implementation of various ZSTD_compressBegin_usingCDict* functions.
*/
static size_t ZSTD_compressBegin_usingCDict_internal(
ZSTD_CCtx* const cctx, const ZSTD_CDict* const cdict,
ZSTD_frameParameters const fParams, unsigned long long const pledgedSrcSize)
{
ZSTD_CCtx_params cctxParams;
DEBUGLOG(4, "ZSTD_compressBegin_usingCDict_internal");
RETURN_ERROR_IF(cdict==NULL, dictionary_wrong, "NULL pointer!");
/* Initialize the cctxParams from the cdict */
{
ZSTD_parameters params;
params.fParams = fParams;
params.cParams = ( pledgedSrcSize < ZSTD_USE_CDICT_PARAMS_SRCSIZE_CUTOFF
|| pledgedSrcSize < cdict->dictContentSize * ZSTD_USE_CDICT_PARAMS_DICTSIZE_MULTIPLIER
|| pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN
|| cdict->compressionLevel == 0 ) ?
ZSTD_getCParamsFromCDict(cdict)
: ZSTD_getCParams(cdict->compressionLevel,
pledgedSrcSize,
cdict->dictContentSize);
ZSTD_CCtxParams_init_internal(&cctxParams, &params, cdict->compressionLevel);
}
/* Increase window log to fit the entire dictionary and source if the
* source size is known. Limit the increase to 19, which is the
* window log for compression level 1 with the largest source size.
*/
if (pledgedSrcSize != ZSTD_CONTENTSIZE_UNKNOWN) {
U32 const limitedSrcSize = (U32)MIN(pledgedSrcSize, 1U << 19);
U32 const limitedSrcLog = limitedSrcSize > 1 ? ZSTD_highbit32(limitedSrcSize - 1) + 1 : 1;
cctxParams.cParams.windowLog = MAX(cctxParams.cParams.windowLog, limitedSrcLog);
}
return ZSTD_compressBegin_internal(cctx,
NULL, 0, ZSTD_dct_auto, ZSTD_dtlm_fast,
cdict,
&cctxParams, pledgedSrcSize,
ZSTDb_not_buffered);
}
/* ZSTD_compressBegin_usingCDict_advanced() :
* This function is DEPRECATED.
* cdict must be != NULL */
size_t ZSTD_compressBegin_usingCDict_advanced(
ZSTD_CCtx* const cctx, const ZSTD_CDict* const cdict,
ZSTD_frameParameters const fParams, unsigned long long const pledgedSrcSize)
{
return ZSTD_compressBegin_usingCDict_internal(cctx, cdict, fParams, pledgedSrcSize);
}
/* ZSTD_compressBegin_usingCDict() :
* cdict must be != NULL */
size_t ZSTD_compressBegin_usingCDict_deprecated(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict)
{
ZSTD_frameParameters const fParams = { 0 /*content*/, 0 /*checksum*/, 0 /*noDictID*/ };
return ZSTD_compressBegin_usingCDict_internal(cctx, cdict, fParams, ZSTD_CONTENTSIZE_UNKNOWN);
}
size_t ZSTD_compressBegin_usingCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict)
{
return ZSTD_compressBegin_usingCDict_deprecated(cctx, cdict);
}
/*! ZSTD_compress_usingCDict_internal():
* Implementation of various ZSTD_compress_usingCDict* functions.
*/
static size_t ZSTD_compress_usingCDict_internal(ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
const ZSTD_CDict* cdict, ZSTD_frameParameters fParams)
{
FORWARD_IF_ERROR(ZSTD_compressBegin_usingCDict_internal(cctx, cdict, fParams, srcSize), ""); /* will check if cdict != NULL */
return ZSTD_compressEnd_public(cctx, dst, dstCapacity, src, srcSize);
}
/*! ZSTD_compress_usingCDict_advanced():
* This function is DEPRECATED.
*/
size_t ZSTD_compress_usingCDict_advanced(ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
const ZSTD_CDict* cdict, ZSTD_frameParameters fParams)
{
return ZSTD_compress_usingCDict_internal(cctx, dst, dstCapacity, src, srcSize, cdict, fParams);
}
/*! 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 parameters are decided at CDict creation time
* while frame parameters are hardcoded */
size_t ZSTD_compress_usingCDict(ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
const ZSTD_CDict* cdict)
{
ZSTD_frameParameters const fParams = { 1 /*content*/, 0 /*checksum*/, 0 /*noDictID*/ };
return ZSTD_compress_usingCDict_internal(cctx, dst, dstCapacity, src, srcSize, cdict, fParams);
}
/* ******************************************************************
* Streaming
********************************************************************/
ZSTD_CStream* ZSTD_createCStream(void)
{
DEBUGLOG(3, "ZSTD_createCStream");
return ZSTD_createCStream_advanced(ZSTD_defaultCMem);
}
ZSTD_CStream* ZSTD_initStaticCStream(void *workspace, size_t workspaceSize)
{
return ZSTD_initStaticCCtx(workspace, workspaceSize);
}
ZSTD_CStream* ZSTD_createCStream_advanced(ZSTD_customMem customMem)
{ /* CStream and CCtx are now same object */
return ZSTD_createCCtx_advanced(customMem);
}
size_t ZSTD_freeCStream(ZSTD_CStream* zcs)
{
return ZSTD_freeCCtx(zcs); /* same object */
}
/*====== Initialization ======*/
size_t ZSTD_CStreamInSize(void) { return ZSTD_BLOCKSIZE_MAX; }
size_t ZSTD_CStreamOutSize(void)
{
return ZSTD_compressBound(ZSTD_BLOCKSIZE_MAX) + ZSTD_blockHeaderSize + 4 /* 32-bits hash */ ;
}
static ZSTD_cParamMode_e ZSTD_getCParamMode(ZSTD_CDict const* cdict, ZSTD_CCtx_params const* params, U64 pledgedSrcSize)
{
if (cdict != NULL && ZSTD_shouldAttachDict(cdict, params, pledgedSrcSize))
return ZSTD_cpm_attachDict;
else
return ZSTD_cpm_noAttachDict;
}
/* ZSTD_resetCStream():
* pledgedSrcSize == 0 means "unknown" */
size_t ZSTD_resetCStream(ZSTD_CStream* zcs, unsigned long long pss)
{
/* temporary : 0 interpreted as "unknown" during transition period.
* Users willing to specify "unknown" **must** use ZSTD_CONTENTSIZE_UNKNOWN.
* 0 will be interpreted as "empty" in the future.
*/
U64 const pledgedSrcSize = (pss==0) ? ZSTD_CONTENTSIZE_UNKNOWN : pss;
DEBUGLOG(4, "ZSTD_resetCStream: pledgedSrcSize = %u", (unsigned)pledgedSrcSize);
FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
FORWARD_IF_ERROR( ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize) , "");
return 0;
}
/*! ZSTD_initCStream_internal() :
* Note : for lib/compress only. Used by zstdmt_compress.c.
* Assumption 1 : params are valid
* Assumption 2 : either dict, or cdict, is defined, not both */
size_t ZSTD_initCStream_internal(ZSTD_CStream* zcs,
const void* dict, size_t dictSize, const ZSTD_CDict* cdict,
const ZSTD_CCtx_params* params,
unsigned long long pledgedSrcSize)
{
DEBUGLOG(4, "ZSTD_initCStream_internal");
FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
FORWARD_IF_ERROR( ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize) , "");
assert(!ZSTD_isError(ZSTD_checkCParams(params->cParams)));
zcs->requestedParams = *params;
assert(!((dict) && (cdict))); /* either dict or cdict, not both */
if (dict) {
FORWARD_IF_ERROR( ZSTD_CCtx_loadDictionary(zcs, dict, dictSize) , "");
} else {
/* Dictionary is cleared if !cdict */
FORWARD_IF_ERROR( ZSTD_CCtx_refCDict(zcs, cdict) , "");
}
return 0;
}
/* ZSTD_initCStream_usingCDict_advanced() :
* same as ZSTD_initCStream_usingCDict(), with control over frame parameters */
size_t ZSTD_initCStream_usingCDict_advanced(ZSTD_CStream* zcs,
const ZSTD_CDict* cdict,
ZSTD_frameParameters fParams,
unsigned long long pledgedSrcSize)
{
DEBUGLOG(4, "ZSTD_initCStream_usingCDict_advanced");
FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
FORWARD_IF_ERROR( ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize) , "");
zcs->requestedParams.fParams = fParams;
FORWARD_IF_ERROR( ZSTD_CCtx_refCDict(zcs, cdict) , "");
return 0;
}
/* note : cdict must outlive compression session */
size_t ZSTD_initCStream_usingCDict(ZSTD_CStream* zcs, const ZSTD_CDict* cdict)
{
DEBUGLOG(4, "ZSTD_initCStream_usingCDict");
FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
FORWARD_IF_ERROR( ZSTD_CCtx_refCDict(zcs, cdict) , "");
return 0;
}
/* ZSTD_initCStream_advanced() :
* pledgedSrcSize must be exact.
* if srcSize is not known at init time, use value ZSTD_CONTENTSIZE_UNKNOWN.
* dict is loaded with default parameters ZSTD_dct_auto and ZSTD_dlm_byCopy. */
size_t ZSTD_initCStream_advanced(ZSTD_CStream* zcs,
const void* dict, size_t dictSize,
ZSTD_parameters params, unsigned long long pss)
{
/* for compatibility with older programs relying on this behavior.
* Users should now specify ZSTD_CONTENTSIZE_UNKNOWN.
* This line will be removed in the future.
*/
U64 const pledgedSrcSize = (pss==0 && params.fParams.contentSizeFlag==0) ? ZSTD_CONTENTSIZE_UNKNOWN : pss;
DEBUGLOG(4, "ZSTD_initCStream_advanced");
FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
FORWARD_IF_ERROR( ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize) , "");
FORWARD_IF_ERROR( ZSTD_checkCParams(params.cParams) , "");
ZSTD_CCtxParams_setZstdParams(&zcs->requestedParams, &params);
FORWARD_IF_ERROR( ZSTD_CCtx_loadDictionary(zcs, dict, dictSize) , "");
return 0;
}
size_t ZSTD_initCStream_usingDict(ZSTD_CStream* zcs, const void* dict, size_t dictSize, int compressionLevel)
{
DEBUGLOG(4, "ZSTD_initCStream_usingDict");
FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
FORWARD_IF_ERROR( ZSTD_CCtx_setParameter(zcs, ZSTD_c_compressionLevel, compressionLevel) , "");
FORWARD_IF_ERROR( ZSTD_CCtx_loadDictionary(zcs, dict, dictSize) , "");
return 0;
}
size_t ZSTD_initCStream_srcSize(ZSTD_CStream* zcs, int compressionLevel, unsigned long long pss)
{
/* temporary : 0 interpreted as "unknown" during transition period.
* Users willing to specify "unknown" **must** use ZSTD_CONTENTSIZE_UNKNOWN.
* 0 will be interpreted as "empty" in the future.
*/
U64 const pledgedSrcSize = (pss==0) ? ZSTD_CONTENTSIZE_UNKNOWN : pss;
DEBUGLOG(4, "ZSTD_initCStream_srcSize");
FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
FORWARD_IF_ERROR( ZSTD_CCtx_refCDict(zcs, NULL) , "");
FORWARD_IF_ERROR( ZSTD_CCtx_setParameter(zcs, ZSTD_c_compressionLevel, compressionLevel) , "");
FORWARD_IF_ERROR( ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize) , "");
return 0;
}
size_t ZSTD_initCStream(ZSTD_CStream* zcs, int compressionLevel)
{
DEBUGLOG(4, "ZSTD_initCStream");
FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
FORWARD_IF_ERROR( ZSTD_CCtx_refCDict(zcs, NULL) , "");
FORWARD_IF_ERROR( ZSTD_CCtx_setParameter(zcs, ZSTD_c_compressionLevel, compressionLevel) , "");
return 0;
}
/*====== Compression ======*/
static size_t ZSTD_nextInputSizeHint(const ZSTD_CCtx* cctx)
{
if (cctx->appliedParams.inBufferMode == ZSTD_bm_stable) {
return cctx->blockSize - cctx->stableIn_notConsumed;
}
assert(cctx->appliedParams.inBufferMode == ZSTD_bm_buffered);
{ size_t hintInSize = cctx->inBuffTarget - cctx->inBuffPos;
if (hintInSize==0) hintInSize = cctx->blockSize;
return hintInSize;
}
}
/** ZSTD_compressStream_generic():
* internal function for all *compressStream*() variants
* @return : hint size for next input to complete ongoing block */
static size_t ZSTD_compressStream_generic(ZSTD_CStream* zcs,
ZSTD_outBuffer* output,
ZSTD_inBuffer* input,
ZSTD_EndDirective const flushMode)
{
const char* const istart = (assert(input != NULL), (const char*)input->src);
const char* const iend = (istart != NULL) ? istart + input->size : istart;
const char* ip = (istart != NULL) ? istart + input->pos : istart;
char* const ostart = (assert(output != NULL), (char*)output->dst);
char* const oend = (ostart != NULL) ? ostart + output->size : ostart;
char* op = (ostart != NULL) ? ostart + output->pos : ostart;
U32 someMoreWork = 1;
/* check expectations */
DEBUGLOG(5, "ZSTD_compressStream_generic, flush=%i, srcSize = %zu", (int)flushMode, input->size - input->pos);
assert(zcs != NULL);
if (zcs->appliedParams.inBufferMode == ZSTD_bm_stable) {
assert(input->pos >= zcs->stableIn_notConsumed);
input->pos -= zcs->stableIn_notConsumed;
if (ip) ip -= zcs->stableIn_notConsumed;
zcs->stableIn_notConsumed = 0;
}
if (zcs->appliedParams.inBufferMode == ZSTD_bm_buffered) {
assert(zcs->inBuff != NULL);
assert(zcs->inBuffSize > 0);
}
if (zcs->appliedParams.outBufferMode == ZSTD_bm_buffered) {
assert(zcs->outBuff != NULL);
assert(zcs->outBuffSize > 0);
}
if (input->src == NULL) assert(input->size == 0);
assert(input->pos <= input->size);
if (output->dst == NULL) assert(output->size == 0);
assert(output->pos <= output->size);
assert((U32)flushMode <= (U32)ZSTD_e_end);
while (someMoreWork) {
switch(zcs->streamStage)
{
case zcss_init:
RETURN_ERROR(init_missing, "call ZSTD_initCStream() first!");
case zcss_load:
if ( (flushMode == ZSTD_e_end)
&& ( (size_t)(oend-op) >= ZSTD_compressBound(iend-ip) /* Enough output space */
|| zcs->appliedParams.outBufferMode == ZSTD_bm_stable) /* OR we are allowed to return dstSizeTooSmall */
&& (zcs->inBuffPos == 0) ) {
/* shortcut to compression pass directly into output buffer */
size_t const cSize = ZSTD_compressEnd_public(zcs,
op, oend-op, ip, iend-ip);
DEBUGLOG(4, "ZSTD_compressEnd : cSize=%u", (unsigned)cSize);
FORWARD_IF_ERROR(cSize, "ZSTD_compressEnd failed");
ip = iend;
op += cSize;
zcs->frameEnded = 1;
ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only);
someMoreWork = 0; break;
}
/* complete loading into inBuffer in buffered mode */
if (zcs->appliedParams.inBufferMode == ZSTD_bm_buffered) {
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;
if (ip) ip += loaded;
if ( (flushMode == ZSTD_e_continue)
&& (zcs->inBuffPos < zcs->inBuffTarget) ) {
/* not enough input to fill full block : stop here */
someMoreWork = 0; break;
}
if ( (flushMode == ZSTD_e_flush)
&& (zcs->inBuffPos == zcs->inToCompress) ) {
/* empty */
someMoreWork = 0; break;
}
} else {
assert(zcs->appliedParams.inBufferMode == ZSTD_bm_stable);
if ( (flushMode == ZSTD_e_continue)
&& ( (size_t)(iend - ip) < zcs->blockSize) ) {
/* can't compress a full block : stop here */
zcs->stableIn_notConsumed = (size_t)(iend - ip);
ip = iend; /* pretend to have consumed input */
someMoreWork = 0; break;
}
if ( (flushMode == ZSTD_e_flush)
&& (ip == iend) ) {
/* empty */
someMoreWork = 0; break;
}
}
/* compress current block (note : this stage cannot be stopped in the middle) */
DEBUGLOG(5, "stream compression stage (flushMode==%u)", flushMode);
{ int const inputBuffered = (zcs->appliedParams.inBufferMode == ZSTD_bm_buffered);
void* cDst;
size_t cSize;
size_t oSize = oend-op;
size_t const iSize = inputBuffered ? zcs->inBuffPos - zcs->inToCompress
: MIN((size_t)(iend - ip), zcs->blockSize);
if (oSize >= ZSTD_compressBound(iSize) || zcs->appliedParams.outBufferMode == ZSTD_bm_stable)
cDst = op; /* compress into output buffer, to skip flush stage */
else
cDst = zcs->outBuff, oSize = zcs->outBuffSize;
if (inputBuffered) {
unsigned const lastBlock = (flushMode == ZSTD_e_end) && (ip==iend);
cSize = lastBlock ?
ZSTD_compressEnd_public(zcs, cDst, oSize,
zcs->inBuff + zcs->inToCompress, iSize) :
ZSTD_compressContinue_public(zcs, cDst, oSize,
zcs->inBuff + zcs->inToCompress, iSize);
FORWARD_IF_ERROR(cSize, "%s", lastBlock ? "ZSTD_compressEnd failed" : "ZSTD_compressContinue failed");
zcs->frameEnded = lastBlock;
/* prepare next block */
zcs->inBuffTarget = zcs->inBuffPos + zcs->blockSize;
if (zcs->inBuffTarget > zcs->inBuffSize)
zcs->inBuffPos = 0, zcs->inBuffTarget = zcs->blockSize;
DEBUGLOG(5, "inBuffTarget:%u / inBuffSize:%u",
(unsigned)zcs->inBuffTarget, (unsigned)zcs->inBuffSize);
if (!lastBlock)
assert(zcs->inBuffTarget <= zcs->inBuffSize);
zcs->inToCompress = zcs->inBuffPos;
} else { /* !inputBuffered, hence ZSTD_bm_stable */
unsigned const lastBlock = (flushMode == ZSTD_e_end) && (ip + iSize == iend);
cSize = lastBlock ?
ZSTD_compressEnd_public(zcs, cDst, oSize, ip, iSize) :
ZSTD_compressContinue_public(zcs, cDst, oSize, ip, iSize);
/* Consume the input prior to error checking to mirror buffered mode. */
if (ip) ip += iSize;
FORWARD_IF_ERROR(cSize, "%s", lastBlock ? "ZSTD_compressEnd failed" : "ZSTD_compressContinue failed");
zcs->frameEnded = lastBlock;
if (lastBlock) assert(ip == iend);
}
if (cDst == op) { /* no need to flush */
op += cSize;
if (zcs->frameEnded) {
DEBUGLOG(5, "Frame completed directly in outBuffer");
someMoreWork = 0;
ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only);
}
break;
}
zcs->outBuffContentSize = cSize;
zcs->outBuffFlushedSize = 0;
zcs->streamStage = zcss_flush; /* pass-through to flush stage */
}
ZSTD_FALLTHROUGH;
case zcss_flush:
DEBUGLOG(5, "flush stage");
assert(zcs->appliedParams.outBufferMode == ZSTD_bm_buffered);
{ size_t const toFlush = zcs->outBuffContentSize - zcs->outBuffFlushedSize;
size_t const flushed = ZSTD_limitCopy(op, (size_t)(oend-op),
zcs->outBuff + zcs->outBuffFlushedSize, toFlush);
DEBUGLOG(5, "toFlush: %u into %u ==> flushed: %u",
(unsigned)toFlush, (unsigned)(oend-op), (unsigned)flushed);
if (flushed)
op += flushed;
zcs->outBuffFlushedSize += flushed;
if (toFlush!=flushed) {
/* flush not fully completed, presumably because dst is too small */
assert(op==oend);
someMoreWork = 0;
break;
}
zcs->outBuffContentSize = zcs->outBuffFlushedSize = 0;
if (zcs->frameEnded) {
DEBUGLOG(5, "Frame completed on flush");
someMoreWork = 0;
ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only);
break;
}
zcs->streamStage = zcss_load;
break;
}
default: /* impossible */
assert(0);
}
}
input->pos = ip - istart;
output->pos = op - ostart;
if (zcs->frameEnded) return 0;
return ZSTD_nextInputSizeHint(zcs);
}
static size_t ZSTD_nextInputSizeHint_MTorST(const ZSTD_CCtx* cctx)
{
#ifdef ZSTD_MULTITHREAD
if (cctx->appliedParams.nbWorkers >= 1) {
assert(cctx->mtctx != NULL);
return ZSTDMT_nextInputSizeHint(cctx->mtctx);
}
#endif
return ZSTD_nextInputSizeHint(cctx);
}
size_t ZSTD_compressStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output, ZSTD_inBuffer* input)
{
FORWARD_IF_ERROR( ZSTD_compressStream2(zcs, output, input, ZSTD_e_continue) , "");
return ZSTD_nextInputSizeHint_MTorST(zcs);
}
/* After a compression call set the expected input/output buffer.
* This is validated at the start of the next compression call.
*/
static void
ZSTD_setBufferExpectations(ZSTD_CCtx* cctx, const ZSTD_outBuffer* output, const ZSTD_inBuffer* input)
{
DEBUGLOG(5, "ZSTD_setBufferExpectations (for advanced stable in/out modes)");
if (cctx->appliedParams.inBufferMode == ZSTD_bm_stable) {
cctx->expectedInBuffer = *input;
}
if (cctx->appliedParams.outBufferMode == ZSTD_bm_stable) {
cctx->expectedOutBufferSize = output->size - output->pos;
}
}
/* Validate that the input/output buffers match the expectations set by
* ZSTD_setBufferExpectations.
*/
static size_t ZSTD_checkBufferStability(ZSTD_CCtx const* cctx,
ZSTD_outBuffer const* output,
ZSTD_inBuffer const* input,
ZSTD_EndDirective endOp)
{
if (cctx->appliedParams.inBufferMode == ZSTD_bm_stable) {
ZSTD_inBuffer const expect = cctx->expectedInBuffer;
if (expect.src != input->src || expect.pos != input->pos)
RETURN_ERROR(stabilityCondition_notRespected, "ZSTD_c_stableInBuffer enabled but input differs!");
}
(void)endOp;
if (cctx->appliedParams.outBufferMode == ZSTD_bm_stable) {
size_t const outBufferSize = output->size - output->pos;
if (cctx->expectedOutBufferSize != outBufferSize)
RETURN_ERROR(stabilityCondition_notRespected, "ZSTD_c_stableOutBuffer enabled but output size differs!");
}
return 0;
}
static size_t ZSTD_CCtx_init_compressStream2(ZSTD_CCtx* cctx,
ZSTD_EndDirective endOp,
size_t inSize)
{
ZSTD_CCtx_params params = cctx->requestedParams;
ZSTD_prefixDict const prefixDict = cctx->prefixDict;
FORWARD_IF_ERROR( ZSTD_initLocalDict(cctx) , ""); /* Init the local dict if present. */
ZSTD_memset(&cctx->prefixDict, 0, sizeof(cctx->prefixDict)); /* single usage */
assert(prefixDict.dict==NULL || cctx->cdict==NULL); /* only one can be set */
if (cctx->cdict && !cctx->localDict.cdict) {
/* Let the cdict's compression level take priority over the requested params.
* But do not take the cdict's compression level if the "cdict" is actually a localDict
* generated from ZSTD_initLocalDict().
*/
params.compressionLevel = cctx->cdict->compressionLevel;
}
DEBUGLOG(4, "ZSTD_compressStream2 : transparent init stage");
if (endOp == ZSTD_e_end) cctx->pledgedSrcSizePlusOne = inSize + 1; /* auto-determine pledgedSrcSize */
{ size_t const dictSize = prefixDict.dict
? prefixDict.dictSize
: (cctx->cdict ? cctx->cdict->dictContentSize : 0);
ZSTD_cParamMode_e const mode = ZSTD_getCParamMode(cctx->cdict, &params, cctx->pledgedSrcSizePlusOne - 1);
params.cParams = ZSTD_getCParamsFromCCtxParams(
&params, cctx->pledgedSrcSizePlusOne-1,
dictSize, mode);
}
params.useBlockSplitter = ZSTD_resolveBlockSplitterMode(params.useBlockSplitter, &params.cParams);
params.ldmParams.enableLdm = ZSTD_resolveEnableLdm(params.ldmParams.enableLdm, &params.cParams);
params.useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(params.useRowMatchFinder, &params.cParams);
params.validateSequences = ZSTD_resolveExternalSequenceValidation(params.validateSequences);
params.maxBlockSize = ZSTD_resolveMaxBlockSize(params.maxBlockSize);
params.searchForExternalRepcodes = ZSTD_resolveExternalRepcodeSearch(params.searchForExternalRepcodes, params.compressionLevel);
#ifdef ZSTD_MULTITHREAD
/* If external matchfinder is enabled, make sure to fail before checking job size (for consistency) */
RETURN_ERROR_IF(
ZSTD_hasExtSeqProd(&params) && params.nbWorkers >= 1,
parameter_combination_unsupported,
"External sequence producer isn't supported with nbWorkers >= 1"
);
if ((cctx->pledgedSrcSizePlusOne-1) <= ZSTDMT_JOBSIZE_MIN) {
params.nbWorkers = 0; /* do not invoke multi-threading when src size is too small */
}
if (params.nbWorkers > 0) {
#if ZSTD_TRACE
cctx->traceCtx = (ZSTD_trace_compress_begin != NULL) ? ZSTD_trace_compress_begin(cctx) : 0;
#endif
/* mt context creation */
if (cctx->mtctx == NULL) {
DEBUGLOG(4, "ZSTD_compressStream2: creating new mtctx for nbWorkers=%u",
params.nbWorkers);
cctx->mtctx = ZSTDMT_createCCtx_advanced((U32)params.nbWorkers, cctx->customMem, cctx->pool);
RETURN_ERROR_IF(cctx->mtctx == NULL, memory_allocation, "NULL pointer!");
}
/* mt compression */
DEBUGLOG(4, "call ZSTDMT_initCStream_internal as nbWorkers=%u", params.nbWorkers);
FORWARD_IF_ERROR( ZSTDMT_initCStream_internal(
cctx->mtctx,
prefixDict.dict, prefixDict.dictSize, prefixDict.dictContentType,
cctx->cdict, params, cctx->pledgedSrcSizePlusOne-1) , "");
cctx->dictID = cctx->cdict ? cctx->cdict->dictID : 0;
cctx->dictContentSize = cctx->cdict ? cctx->cdict->dictContentSize : prefixDict.dictSize;
cctx->consumedSrcSize = 0;
cctx->producedCSize = 0;
cctx->streamStage = zcss_load;
cctx->appliedParams = params;
} else
#endif /* ZSTD_MULTITHREAD */
{ U64 const pledgedSrcSize = cctx->pledgedSrcSizePlusOne - 1;
assert(!ZSTD_isError(ZSTD_checkCParams(params.cParams)));
FORWARD_IF_ERROR( ZSTD_compressBegin_internal(cctx,
prefixDict.dict, prefixDict.dictSize, prefixDict.dictContentType, ZSTD_dtlm_fast,
cctx->cdict,
&params, pledgedSrcSize,
ZSTDb_buffered) , "");
assert(cctx->appliedParams.nbWorkers == 0);
cctx->inToCompress = 0;
cctx->inBuffPos = 0;
if (cctx->appliedParams.inBufferMode == ZSTD_bm_buffered) {
/* for small input: avoid automatic flush on reaching end of block, since
* it would require to add a 3-bytes null block to end frame
*/
cctx->inBuffTarget = cctx->blockSize + (cctx->blockSize == pledgedSrcSize);
} else {
cctx->inBuffTarget = 0;
}
cctx->outBuffContentSize = cctx->outBuffFlushedSize = 0;
cctx->streamStage = zcss_load;
cctx->frameEnded = 0;
}
return 0;
}
/* @return provides a minimum amount of data remaining to be flushed from internal buffers
*/
size_t ZSTD_compressStream2( ZSTD_CCtx* cctx,
ZSTD_outBuffer* output,
ZSTD_inBuffer* input,
ZSTD_EndDirective endOp)
{
DEBUGLOG(5, "ZSTD_compressStream2, endOp=%u ", (unsigned)endOp);
/* check conditions */
RETURN_ERROR_IF(output->pos > output->size, dstSize_tooSmall, "invalid output buffer");
RETURN_ERROR_IF(input->pos > input->size, srcSize_wrong, "invalid input buffer");
RETURN_ERROR_IF((U32)endOp > (U32)ZSTD_e_end, parameter_outOfBound, "invalid endDirective");
assert(cctx != NULL);
/* transparent initialization stage */
if (cctx->streamStage == zcss_init) {
size_t const inputSize = input->size - input->pos; /* no obligation to start from pos==0 */
size_t const totalInputSize = inputSize + cctx->stableIn_notConsumed;
if ( (cctx->requestedParams.inBufferMode == ZSTD_bm_stable) /* input is presumed stable, across invocations */
&& (endOp == ZSTD_e_continue) /* no flush requested, more input to come */
&& (totalInputSize < ZSTD_BLOCKSIZE_MAX) ) { /* not even reached one block yet */
if (cctx->stableIn_notConsumed) { /* not the first time */
/* check stable source guarantees */
RETURN_ERROR_IF(input->src != cctx->expectedInBuffer.src, stabilityCondition_notRespected, "stableInBuffer condition not respected: wrong src pointer");
RETURN_ERROR_IF(input->pos != cctx->expectedInBuffer.size, stabilityCondition_notRespected, "stableInBuffer condition not respected: externally modified pos");
}
/* pretend input was consumed, to give a sense forward progress */
input->pos = input->size;
/* save stable inBuffer, for later control, and flush/end */
cctx->expectedInBuffer = *input;
/* but actually input wasn't consumed, so keep track of position from where compression shall resume */
cctx->stableIn_notConsumed += inputSize;
/* don't initialize yet, wait for the first block of flush() order, for better parameters adaptation */
return ZSTD_FRAMEHEADERSIZE_MIN(cctx->requestedParams.format); /* at least some header to produce */
}
FORWARD_IF_ERROR(ZSTD_CCtx_init_compressStream2(cctx, endOp, totalInputSize), "compressStream2 initialization failed");
ZSTD_setBufferExpectations(cctx, output, input); /* Set initial buffer expectations now that we've initialized */
}
/* end of transparent initialization stage */
FORWARD_IF_ERROR(ZSTD_checkBufferStability(cctx, output, input, endOp), "invalid buffers");
/* compression stage */
#ifdef ZSTD_MULTITHREAD
if (cctx->appliedParams.nbWorkers > 0) {
size_t flushMin;
if (cctx->cParamsChanged) {
ZSTDMT_updateCParams_whileCompressing(cctx->mtctx, &cctx->requestedParams);
cctx->cParamsChanged = 0;
}
if (cctx->stableIn_notConsumed) {
assert(cctx->appliedParams.inBufferMode == ZSTD_bm_stable);
/* some early data was skipped - make it available for consumption */
assert(input->pos >= cctx->stableIn_notConsumed);
input->pos -= cctx->stableIn_notConsumed;
cctx->stableIn_notConsumed = 0;
}
for (;;) {
size_t const ipos = input->pos;
size_t const opos = output->pos;
flushMin = ZSTDMT_compressStream_generic(cctx->mtctx, output, input, endOp);
cctx->consumedSrcSize += (U64)(input->pos - ipos);
cctx->producedCSize += (U64)(output->pos - opos);
if ( ZSTD_isError(flushMin)
|| (endOp == ZSTD_e_end && flushMin == 0) ) { /* compression completed */
if (flushMin == 0)
ZSTD_CCtx_trace(cctx, 0);
ZSTD_CCtx_reset(cctx, ZSTD_reset_session_only);
}
FORWARD_IF_ERROR(flushMin, "ZSTDMT_compressStream_generic failed");
if (endOp == ZSTD_e_continue) {
/* We only require some progress with ZSTD_e_continue, not maximal progress.
* We're done if we've consumed or produced any bytes, or either buffer is
* full.
*/
if (input->pos != ipos || output->pos != opos || input->pos == input->size || output->pos == output->size)
break;
} else {
assert(endOp == ZSTD_e_flush || endOp == ZSTD_e_end);
/* We require maximal progress. We're done when the flush is complete or the
* output buffer is full.
*/
if (flushMin == 0 || output->pos == output->size)
break;
}
}
DEBUGLOG(5, "completed ZSTD_compressStream2 delegating to ZSTDMT_compressStream_generic");
/* Either we don't require maximum forward progress, we've finished the
* flush, or we are out of output space.
*/
assert(endOp == ZSTD_e_continue || flushMin == 0 || output->pos == output->size);
ZSTD_setBufferExpectations(cctx, output, input);
return flushMin;
}
#endif /* ZSTD_MULTITHREAD */
FORWARD_IF_ERROR( ZSTD_compressStream_generic(cctx, output, input, endOp) , "");
DEBUGLOG(5, "completed ZSTD_compressStream2");
ZSTD_setBufferExpectations(cctx, output, input);
return cctx->outBuffContentSize - cctx->outBuffFlushedSize; /* remaining to flush */
}
size_t ZSTD_compressStream2_simpleArgs (
ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity, size_t* dstPos,
const void* src, size_t srcSize, size_t* srcPos,
ZSTD_EndDirective endOp)
{
ZSTD_outBuffer output;
ZSTD_inBuffer input;
output.dst = dst;
output.size = dstCapacity;
output.pos = *dstPos;
input.src = src;
input.size = srcSize;
input.pos = *srcPos;
/* ZSTD_compressStream2() will check validity of dstPos and srcPos */
{ size_t const cErr = ZSTD_compressStream2(cctx, &output, &input, endOp);
*dstPos = output.pos;
*srcPos = input.pos;
return cErr;
}
}
size_t ZSTD_compress2(ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize)
{
ZSTD_bufferMode_e const originalInBufferMode = cctx->requestedParams.inBufferMode;
ZSTD_bufferMode_e const originalOutBufferMode = cctx->requestedParams.outBufferMode;
DEBUGLOG(4, "ZSTD_compress2 (srcSize=%u)", (unsigned)srcSize);
ZSTD_CCtx_reset(cctx, ZSTD_reset_session_only);
/* Enable stable input/output buffers. */
cctx->requestedParams.inBufferMode = ZSTD_bm_stable;
cctx->requestedParams.outBufferMode = ZSTD_bm_stable;
{ size_t oPos = 0;
size_t iPos = 0;
size_t const result = ZSTD_compressStream2_simpleArgs(cctx,
dst, dstCapacity, &oPos,
src, srcSize, &iPos,
ZSTD_e_end);
/* Reset to the original values. */
cctx->requestedParams.inBufferMode = originalInBufferMode;
cctx->requestedParams.outBufferMode = originalOutBufferMode;
FORWARD_IF_ERROR(result, "ZSTD_compressStream2_simpleArgs failed");
if (result != 0) { /* compression not completed, due to lack of output space */
assert(oPos == dstCapacity);
RETURN_ERROR(dstSize_tooSmall, "");
}
assert(iPos == srcSize); /* all input is expected consumed */
return oPos;
}
}
/* ZSTD_validateSequence() :
* @offCode : is presumed to follow format required by ZSTD_storeSeq()
* @returns a ZSTD error code if sequence is not valid
*/
static size_t
ZSTD_validateSequence(U32 offCode, U32 matchLength, U32 minMatch,
size_t posInSrc, U32 windowLog, size_t dictSize, int useSequenceProducer)
{
U32 const windowSize = 1u << windowLog;
/* posInSrc represents the amount of data the decoder would decode up to this point.
* As long as the amount of data decoded is less than or equal to window size, offsets may be
* larger than the total length of output decoded in order to reference the dict, even larger than
* window size. After output surpasses windowSize, we're limited to windowSize offsets again.
*/
size_t const offsetBound = posInSrc > windowSize ? (size_t)windowSize : posInSrc + (size_t)dictSize;
size_t const matchLenLowerBound = (minMatch == 3 || useSequenceProducer) ? 3 : 4;
RETURN_ERROR_IF(offCode > OFFSET_TO_OFFBASE(offsetBound), externalSequences_invalid, "Offset too large!");
/* Validate maxNbSeq is large enough for the given matchLength and minMatch */
RETURN_ERROR_IF(matchLength < matchLenLowerBound, externalSequences_invalid, "Matchlength too small for the minMatch");
return 0;
}
/* Returns an offset code, given a sequence's raw offset, the ongoing repcode array, and whether litLength == 0 */
static U32 ZSTD_finalizeOffBase(U32 rawOffset, const U32 rep[ZSTD_REP_NUM], U32 ll0)
{
U32 offBase = OFFSET_TO_OFFBASE(rawOffset);
if (!ll0 && rawOffset == rep[0]) {
offBase = REPCODE1_TO_OFFBASE;
} else if (rawOffset == rep[1]) {
offBase = REPCODE_TO_OFFBASE(2 - ll0);
} else if (rawOffset == rep[2]) {
offBase = REPCODE_TO_OFFBASE(3 - ll0);
} else if (ll0 && rawOffset == rep[0] - 1) {
offBase = REPCODE3_TO_OFFBASE;
}
return offBase;
}
size_t
ZSTD_copySequencesToSeqStoreExplicitBlockDelim(ZSTD_CCtx* cctx,
ZSTD_sequencePosition* seqPos,
const ZSTD_Sequence* const inSeqs, size_t inSeqsSize,
const void* src, size_t blockSize,
ZSTD_paramSwitch_e externalRepSearch)
{
U32 idx = seqPos->idx;
U32 const startIdx = idx;
BYTE const* ip = (BYTE const*)(src);
const BYTE* const iend = ip + blockSize;
repcodes_t updatedRepcodes;
U32 dictSize;
DEBUGLOG(5, "ZSTD_copySequencesToSeqStoreExplicitBlockDelim (blockSize = %zu)", blockSize);
if (cctx->cdict) {
dictSize = (U32)cctx->cdict->dictContentSize;
} else if (cctx->prefixDict.dict) {
dictSize = (U32)cctx->prefixDict.dictSize;
} else {
dictSize = 0;
}
ZSTD_memcpy(updatedRepcodes.rep, cctx->blockState.prevCBlock->rep, sizeof(repcodes_t));
for (; idx < inSeqsSize && (inSeqs[idx].matchLength != 0 || inSeqs[idx].offset != 0); ++idx) {
U32 const litLength = inSeqs[idx].litLength;
U32 const matchLength = inSeqs[idx].matchLength;
U32 offBase;
if (externalRepSearch == ZSTD_ps_disable) {
offBase = OFFSET_TO_OFFBASE(inSeqs[idx].offset);
} else {
U32 const ll0 = (litLength == 0);
offBase = ZSTD_finalizeOffBase(inSeqs[idx].offset, updatedRepcodes.rep, ll0);
ZSTD_updateRep(updatedRepcodes.rep, offBase, ll0);
}
DEBUGLOG(6, "Storing sequence: (of: %u, ml: %u, ll: %u)", offBase, matchLength, litLength);
if (cctx->appliedParams.validateSequences) {
seqPos->posInSrc += litLength + matchLength;
FORWARD_IF_ERROR(ZSTD_validateSequence(offBase, matchLength, cctx->appliedParams.cParams.minMatch, seqPos->posInSrc,
cctx->appliedParams.cParams.windowLog, dictSize, ZSTD_hasExtSeqProd(&cctx->appliedParams)),
"Sequence validation failed");
}
RETURN_ERROR_IF(idx - seqPos->idx >= cctx->seqStore.maxNbSeq, externalSequences_invalid,
"Not enough memory allocated. Try adjusting ZSTD_c_minMatch.");
ZSTD_storeSeq(&cctx->seqStore, litLength, ip, iend, offBase, matchLength);
ip += matchLength + litLength;
}
/* If we skipped repcode search while parsing, we need to update repcodes now */
assert(externalRepSearch != ZSTD_ps_auto);
assert(idx >= startIdx);
if (externalRepSearch == ZSTD_ps_disable && idx != startIdx) {
U32* const rep = updatedRepcodes.rep;
U32 lastSeqIdx = idx - 1; /* index of last non-block-delimiter sequence */
if (lastSeqIdx >= startIdx + 2) {
rep[2] = inSeqs[lastSeqIdx - 2].offset;
rep[1] = inSeqs[lastSeqIdx - 1].offset;
rep[0] = inSeqs[lastSeqIdx].offset;
} else if (lastSeqIdx == startIdx + 1) {
rep[2] = rep[0];
rep[1] = inSeqs[lastSeqIdx - 1].offset;
rep[0] = inSeqs[lastSeqIdx].offset;
} else {
assert(lastSeqIdx == startIdx);
rep[2] = rep[1];
rep[1] = rep[0];
rep[0] = inSeqs[lastSeqIdx].offset;
}
}
ZSTD_memcpy(cctx->blockState.nextCBlock->rep, updatedRepcodes.rep, sizeof(repcodes_t));
if (inSeqs[idx].litLength) {
DEBUGLOG(6, "Storing last literals of size: %u", inSeqs[idx].litLength);
ZSTD_storeLastLiterals(&cctx->seqStore, ip, inSeqs[idx].litLength);
ip += inSeqs[idx].litLength;
seqPos->posInSrc += inSeqs[idx].litLength;
}
RETURN_ERROR_IF(ip != iend, externalSequences_invalid, "Blocksize doesn't agree with block delimiter!");
seqPos->idx = idx+1;
return 0;
}
size_t
ZSTD_copySequencesToSeqStoreNoBlockDelim(ZSTD_CCtx* cctx, ZSTD_sequencePosition* seqPos,
const ZSTD_Sequence* const inSeqs, size_t inSeqsSize,
const void* src, size_t blockSize, ZSTD_paramSwitch_e externalRepSearch)
{
U32 idx = seqPos->idx;
U32 startPosInSequence = seqPos->posInSequence;
U32 endPosInSequence = seqPos->posInSequence + (U32)blockSize;
size_t dictSize;
BYTE const* ip = (BYTE const*)(src);
BYTE const* iend = ip + blockSize; /* May be adjusted if we decide to process fewer than blockSize bytes */
repcodes_t updatedRepcodes;
U32 bytesAdjustment = 0;
U32 finalMatchSplit = 0;
/* TODO(embg) support fast parsing mode in noBlockDelim mode */
(void)externalRepSearch;
if (cctx->cdict) {
dictSize = cctx->cdict->dictContentSize;
} else if (cctx->prefixDict.dict) {
dictSize = cctx->prefixDict.dictSize;
} else {
dictSize = 0;
}
DEBUGLOG(5, "ZSTD_copySequencesToSeqStoreNoBlockDelim: idx: %u PIS: %u blockSize: %zu", idx, startPosInSequence, blockSize);
DEBUGLOG(5, "Start seq: idx: %u (of: %u ml: %u ll: %u)", idx, inSeqs[idx].offset, inSeqs[idx].matchLength, inSeqs[idx].litLength);
ZSTD_memcpy(updatedRepcodes.rep, cctx->blockState.prevCBlock->rep, sizeof(repcodes_t));
while (endPosInSequence && idx < inSeqsSize && !finalMatchSplit) {
const ZSTD_Sequence currSeq = inSeqs[idx];
U32 litLength = currSeq.litLength;
U32 matchLength = currSeq.matchLength;
U32 const rawOffset = currSeq.offset;
U32 offBase;
/* Modify the sequence depending on where endPosInSequence lies */
if (endPosInSequence >= currSeq.litLength + currSeq.matchLength) {
if (startPosInSequence >= litLength) {
startPosInSequence -= litLength;
litLength = 0;
matchLength -= startPosInSequence;
} else {
litLength -= startPosInSequence;
}
/* Move to the next sequence */
endPosInSequence -= currSeq.litLength + currSeq.matchLength;
startPosInSequence = 0;
} else {
/* This is the final (partial) sequence we're adding from inSeqs, and endPosInSequence
does not reach the end of the match. So, we have to split the sequence */
DEBUGLOG(6, "Require a split: diff: %u, idx: %u PIS: %u",
currSeq.litLength + currSeq.matchLength - endPosInSequence, idx, endPosInSequence);
if (endPosInSequence > litLength) {
U32 firstHalfMatchLength;
litLength = startPosInSequence >= litLength ? 0 : litLength - startPosInSequence;
firstHalfMatchLength = endPosInSequence - startPosInSequence - litLength;
if (matchLength > blockSize && firstHalfMatchLength >= cctx->appliedParams.cParams.minMatch) {
/* Only ever split the match if it is larger than the block size */
U32 secondHalfMatchLength = currSeq.matchLength + currSeq.litLength - endPosInSequence;
if (secondHalfMatchLength < cctx->appliedParams.cParams.minMatch) {
/* Move the endPosInSequence backward so that it creates match of minMatch length */
endPosInSequence -= cctx->appliedParams.cParams.minMatch - secondHalfMatchLength;
bytesAdjustment = cctx->appliedParams.cParams.minMatch - secondHalfMatchLength;
firstHalfMatchLength -= bytesAdjustment;
}
matchLength = firstHalfMatchLength;
/* Flag that we split the last match - after storing the sequence, exit the loop,
but keep the value of endPosInSequence */
finalMatchSplit = 1;
} else {
/* Move the position in sequence backwards so that we don't split match, and break to store
* the last literals. We use the original currSeq.litLength as a marker for where endPosInSequence
* should go. We prefer to do this whenever it is not necessary to split the match, or if doing so
* would cause the first half of the match to be too small
*/
bytesAdjustment = endPosInSequence - currSeq.litLength;
endPosInSequence = currSeq.litLength;
break;
}
} else {
/* This sequence ends inside the literals, break to store the last literals */
break;
}
}
/* Check if this offset can be represented with a repcode */
{ U32 const ll0 = (litLength == 0);
offBase = ZSTD_finalizeOffBase(rawOffset, updatedRepcodes.rep, ll0);
ZSTD_updateRep(updatedRepcodes.rep, offBase, ll0);
}
if (cctx->appliedParams.validateSequences) {
seqPos->posInSrc += litLength + matchLength;
FORWARD_IF_ERROR(ZSTD_validateSequence(offBase, matchLength, cctx->appliedParams.cParams.minMatch, seqPos->posInSrc,
cctx->appliedParams.cParams.windowLog, dictSize, ZSTD_hasExtSeqProd(&cctx->appliedParams)),
"Sequence validation failed");
}
DEBUGLOG(6, "Storing sequence: (of: %u, ml: %u, ll: %u)", offBase, matchLength, litLength);
RETURN_ERROR_IF(idx - seqPos->idx >= cctx->seqStore.maxNbSeq, externalSequences_invalid,
"Not enough memory allocated. Try adjusting ZSTD_c_minMatch.");
ZSTD_storeSeq(&cctx->seqStore, litLength, ip, iend, offBase, matchLength);
ip += matchLength + litLength;
if (!finalMatchSplit)
idx++; /* Next Sequence */
}
DEBUGLOG(5, "Ending seq: idx: %u (of: %u ml: %u ll: %u)", idx, inSeqs[idx].offset, inSeqs[idx].matchLength, inSeqs[idx].litLength);
assert(idx == inSeqsSize || endPosInSequence <= inSeqs[idx].litLength + inSeqs[idx].matchLength);
seqPos->idx = idx;
seqPos->posInSequence = endPosInSequence;
ZSTD_memcpy(cctx->blockState.nextCBlock->rep, updatedRepcodes.rep, sizeof(repcodes_t));
iend -= bytesAdjustment;
if (ip != iend) {
/* Store any last literals */
U32 lastLLSize = (U32)(iend - ip);
assert(ip <= iend);
DEBUGLOG(6, "Storing last literals of size: %u", lastLLSize);
ZSTD_storeLastLiterals(&cctx->seqStore, ip, lastLLSize);
seqPos->posInSrc += lastLLSize;
}
return bytesAdjustment;
}
typedef size_t (*ZSTD_sequenceCopier) (ZSTD_CCtx* cctx, ZSTD_sequencePosition* seqPos,
const ZSTD_Sequence* const inSeqs, size_t inSeqsSize,
const void* src, size_t blockSize, ZSTD_paramSwitch_e externalRepSearch);
static ZSTD_sequenceCopier ZSTD_selectSequenceCopier(ZSTD_sequenceFormat_e mode)
{
ZSTD_sequenceCopier sequenceCopier = NULL;
assert(ZSTD_cParam_withinBounds(ZSTD_c_blockDelimiters, mode));
if (mode == ZSTD_sf_explicitBlockDelimiters) {
return ZSTD_copySequencesToSeqStoreExplicitBlockDelim;
} else if (mode == ZSTD_sf_noBlockDelimiters) {
return ZSTD_copySequencesToSeqStoreNoBlockDelim;
}
assert(sequenceCopier != NULL);
return sequenceCopier;
}
/* Discover the size of next block by searching for the delimiter.
* Note that a block delimiter **must** exist in this mode,
* otherwise it's an input error.
* The block size retrieved will be later compared to ensure it remains within bounds */
static size_t
blockSize_explicitDelimiter(const ZSTD_Sequence* inSeqs, size_t inSeqsSize, ZSTD_sequencePosition seqPos)
{
int end = 0;
size_t blockSize = 0;
size_t spos = seqPos.idx;
DEBUGLOG(6, "blockSize_explicitDelimiter : seq %zu / %zu", spos, inSeqsSize);
assert(spos <= inSeqsSize);
while (spos < inSeqsSize) {
end = (inSeqs[spos].offset == 0);
blockSize += inSeqs[spos].litLength + inSeqs[spos].matchLength;
if (end) {
if (inSeqs[spos].matchLength != 0)
RETURN_ERROR(externalSequences_invalid, "delimiter format error : both matchlength and offset must be == 0");
break;
}
spos++;
}
if (!end)
RETURN_ERROR(externalSequences_invalid, "Reached end of sequences without finding a block delimiter");
return blockSize;
}
/* More a "target" block size */
static size_t blockSize_noDelimiter(size_t blockSize, size_t remaining)
{
int const lastBlock = (remaining <= blockSize);
return lastBlock ? remaining : blockSize;
}
static size_t determine_blockSize(ZSTD_sequenceFormat_e mode,
size_t blockSize, size_t remaining,
const ZSTD_Sequence* inSeqs, size_t inSeqsSize, ZSTD_sequencePosition seqPos)
{
DEBUGLOG(6, "determine_blockSize : remainingSize = %zu", remaining);
if (mode == ZSTD_sf_noBlockDelimiters)
return blockSize_noDelimiter(blockSize, remaining);
{ size_t const explicitBlockSize = blockSize_explicitDelimiter(inSeqs, inSeqsSize, seqPos);
FORWARD_IF_ERROR(explicitBlockSize, "Error while determining block size with explicit delimiters");
if (explicitBlockSize > blockSize)
RETURN_ERROR(externalSequences_invalid, "sequences incorrectly define a too large block");
if (explicitBlockSize > remaining)
RETURN_ERROR(externalSequences_invalid, "sequences define a frame longer than source");
return explicitBlockSize;
}
}
/* Compress, block-by-block, all of the sequences given.
*
* Returns the cumulative size of all compressed blocks (including their headers),
* otherwise a ZSTD error.
*/
static size_t
ZSTD_compressSequences_internal(ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity,
const ZSTD_Sequence* inSeqs, size_t inSeqsSize,
const void* src, size_t srcSize)
{
size_t cSize = 0;
size_t remaining = srcSize;
ZSTD_sequencePosition seqPos = {0, 0, 0};
BYTE const* ip = (BYTE const*)src;
BYTE* op = (BYTE*)dst;
ZSTD_sequenceCopier const sequenceCopier = ZSTD_selectSequenceCopier(cctx->appliedParams.blockDelimiters);
DEBUGLOG(4, "ZSTD_compressSequences_internal srcSize: %zu, inSeqsSize: %zu", srcSize, inSeqsSize);
/* Special case: empty frame */
if (remaining == 0) {
U32 const cBlockHeader24 = 1 /* last block */ + (((U32)bt_raw)<<1);
RETURN_ERROR_IF(dstCapacity<4, dstSize_tooSmall, "No room for empty frame block header");
MEM_writeLE32(op, cBlockHeader24);
op += ZSTD_blockHeaderSize;
dstCapacity -= ZSTD_blockHeaderSize;
cSize += ZSTD_blockHeaderSize;
}
while (remaining) {
size_t compressedSeqsSize;
size_t cBlockSize;
size_t additionalByteAdjustment;
size_t blockSize = determine_blockSize(cctx->appliedParams.blockDelimiters,
cctx->blockSize, remaining,
inSeqs, inSeqsSize, seqPos);
U32 const lastBlock = (blockSize == remaining);
FORWARD_IF_ERROR(blockSize, "Error while trying to determine block size");
assert(blockSize <= remaining);
ZSTD_resetSeqStore(&cctx->seqStore);
DEBUGLOG(5, "Working on new block. Blocksize: %zu (total:%zu)", blockSize, (ip - (const BYTE*)src) + blockSize);
additionalByteAdjustment = sequenceCopier(cctx, &seqPos, inSeqs, inSeqsSize, ip, blockSize, cctx->appliedParams.searchForExternalRepcodes);
FORWARD_IF_ERROR(additionalByteAdjustment, "Bad sequence copy");
blockSize -= additionalByteAdjustment;
/* If blocks are too small, emit as a nocompress block */
/* TODO: See 3090. We reduced MIN_CBLOCK_SIZE from 3 to 2 so to compensate we are adding
* additional 1. We need to revisit and change this logic to be more consistent */
if (blockSize < MIN_CBLOCK_SIZE+ZSTD_blockHeaderSize+1+1) {
cBlockSize = ZSTD_noCompressBlock(op, dstCapacity, ip, blockSize, lastBlock);
FORWARD_IF_ERROR(cBlockSize, "Nocompress block failed");
DEBUGLOG(5, "Block too small, writing out nocompress block: cSize: %zu", cBlockSize);
cSize += cBlockSize;
ip += blockSize;
op += cBlockSize;
remaining -= blockSize;
dstCapacity -= cBlockSize;
continue;
}
RETURN_ERROR_IF(dstCapacity < ZSTD_blockHeaderSize, dstSize_tooSmall, "not enough dstCapacity to write a new compressed block");
compressedSeqsSize = ZSTD_entropyCompressSeqStore(&cctx->seqStore,
&cctx->blockState.prevCBlock->entropy, &cctx->blockState.nextCBlock->entropy,
&cctx->appliedParams,
op + ZSTD_blockHeaderSize /* Leave space for block header */, dstCapacity - ZSTD_blockHeaderSize,
blockSize,
cctx->entropyWorkspace, ENTROPY_WORKSPACE_SIZE /* statically allocated in resetCCtx */,
cctx->bmi2);
FORWARD_IF_ERROR(compressedSeqsSize, "Compressing sequences of block failed");
DEBUGLOG(5, "Compressed sequences size: %zu", compressedSeqsSize);
if (!cctx->isFirstBlock &&
ZSTD_maybeRLE(&cctx->seqStore) &&
ZSTD_isRLE(ip, blockSize)) {
/* We don't want to emit our first block as a RLE even if it qualifies because
* doing so will cause the decoder (cli only) to throw a "should consume all input error."
* This is only an issue for zstd <= v1.4.3
*/
compressedSeqsSize = 1;
}
if (compressedSeqsSize == 0) {
/* ZSTD_noCompressBlock writes the block header as well */
cBlockSize = ZSTD_noCompressBlock(op, dstCapacity, ip, blockSize, lastBlock);
FORWARD_IF_ERROR(cBlockSize, "ZSTD_noCompressBlock failed");
DEBUGLOG(5, "Writing out nocompress block, size: %zu", cBlockSize);
} else if (compressedSeqsSize == 1) {
cBlockSize = ZSTD_rleCompressBlock(op, dstCapacity, *ip, blockSize, lastBlock);
FORWARD_IF_ERROR(cBlockSize, "ZSTD_rleCompressBlock failed");
DEBUGLOG(5, "Writing out RLE block, size: %zu", cBlockSize);
} else {
U32 cBlockHeader;
/* Error checking and repcodes update */
ZSTD_blockState_confirmRepcodesAndEntropyTables(&cctx->blockState);
if (cctx->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid)
cctx->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check;
/* Write block header into beginning of block*/
cBlockHeader = lastBlock + (((U32)bt_compressed)<<1) + (U32)(compressedSeqsSize << 3);
MEM_writeLE24(op, cBlockHeader);
cBlockSize = ZSTD_blockHeaderSize + compressedSeqsSize;
DEBUGLOG(5, "Writing out compressed block, size: %zu", cBlockSize);
}
cSize += cBlockSize;
if (lastBlock) {
break;
} else {
ip += blockSize;
op += cBlockSize;
remaining -= blockSize;
dstCapacity -= cBlockSize;
cctx->isFirstBlock = 0;
}
DEBUGLOG(5, "cSize running total: %zu (remaining dstCapacity=%zu)", cSize, dstCapacity);
}
DEBUGLOG(4, "cSize final total: %zu", cSize);
return cSize;
}
size_t ZSTD_compressSequences(ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity,
const ZSTD_Sequence* inSeqs, size_t inSeqsSize,
const void* src, size_t srcSize)
{
BYTE* op = (BYTE*)dst;
size_t cSize = 0;
size_t compressedBlocksSize = 0;
size_t frameHeaderSize = 0;
/* Transparent initialization stage, same as compressStream2() */
DEBUGLOG(4, "ZSTD_compressSequences (dstCapacity=%zu)", dstCapacity);
assert(cctx != NULL);
FORWARD_IF_ERROR(ZSTD_CCtx_init_compressStream2(cctx, ZSTD_e_end, srcSize), "CCtx initialization failed");
/* Begin writing output, starting with frame header */
frameHeaderSize = ZSTD_writeFrameHeader(op, dstCapacity, &cctx->appliedParams, srcSize, cctx->dictID);
op += frameHeaderSize;
dstCapacity -= frameHeaderSize;
cSize += frameHeaderSize;
if (cctx->appliedParams.fParams.checksumFlag && srcSize) {
XXH64_update(&cctx->xxhState, src, srcSize);
}
/* cSize includes block header size and compressed sequences size */
compressedBlocksSize = ZSTD_compressSequences_internal(cctx,
op, dstCapacity,
inSeqs, inSeqsSize,
src, srcSize);
FORWARD_IF_ERROR(compressedBlocksSize, "Compressing blocks failed!");
cSize += compressedBlocksSize;
dstCapacity -= compressedBlocksSize;
if (cctx->appliedParams.fParams.checksumFlag) {
U32 const checksum = (U32) XXH64_digest(&cctx->xxhState);
RETURN_ERROR_IF(dstCapacity<4, dstSize_tooSmall, "no room for checksum");
DEBUGLOG(4, "Write checksum : %08X", (unsigned)checksum);
MEM_writeLE32((char*)dst + cSize, checksum);
cSize += 4;
}
DEBUGLOG(4, "Final compressed size: %zu", cSize);
return cSize;
}
/*====== Finalize ======*/
static ZSTD_inBuffer inBuffer_forEndFlush(const ZSTD_CStream* zcs)
{
const ZSTD_inBuffer nullInput = { NULL, 0, 0 };
const int stableInput = (zcs->appliedParams.inBufferMode == ZSTD_bm_stable);
return stableInput ? zcs->expectedInBuffer : nullInput;
}
/*! ZSTD_flushStream() :
* @return : amount of data remaining to flush */
size_t ZSTD_flushStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output)
{
ZSTD_inBuffer input = inBuffer_forEndFlush(zcs);
input.size = input.pos; /* do not ingest more input during flush */
return ZSTD_compressStream2(zcs, output, &input, ZSTD_e_flush);
}
size_t ZSTD_endStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output)
{
ZSTD_inBuffer input = inBuffer_forEndFlush(zcs);
size_t const remainingToFlush = ZSTD_compressStream2(zcs, output, &input, ZSTD_e_end);
FORWARD_IF_ERROR(remainingToFlush , "ZSTD_compressStream2(,,ZSTD_e_end) failed");
if (zcs->appliedParams.nbWorkers > 0) return remainingToFlush; /* minimal estimation */
/* single thread mode : attempt to calculate remaining to flush more precisely */
{ size_t const lastBlockSize = zcs->frameEnded ? 0 : ZSTD_BLOCKHEADERSIZE;
size_t const checksumSize = (size_t)(zcs->frameEnded ? 0 : zcs->appliedParams.fParams.checksumFlag * 4);
size_t const toFlush = remainingToFlush + lastBlockSize + checksumSize;
DEBUGLOG(4, "ZSTD_endStream : remaining to flush : %u", (unsigned)toFlush);
return toFlush;
}
}
/*-===== Pre-defined compression levels =====-*/
#include "clevels.h"
int ZSTD_maxCLevel(void) { return ZSTD_MAX_CLEVEL; }
int ZSTD_minCLevel(void) { return (int)-ZSTD_TARGETLENGTH_MAX; }
int ZSTD_defaultCLevel(void) { return ZSTD_CLEVEL_DEFAULT; }
static ZSTD_compressionParameters ZSTD_dedicatedDictSearch_getCParams(int const compressionLevel, size_t const dictSize)
{
ZSTD_compressionParameters cParams = ZSTD_getCParams_internal(compressionLevel, 0, dictSize, ZSTD_cpm_createCDict);
switch (cParams.strategy) {
case ZSTD_fast:
case ZSTD_dfast:
break;
case ZSTD_greedy:
case ZSTD_lazy:
case ZSTD_lazy2:
cParams.hashLog += ZSTD_LAZY_DDSS_BUCKET_LOG;
break;
case ZSTD_btlazy2:
case ZSTD_btopt:
case ZSTD_btultra:
case ZSTD_btultra2:
break;
}
return cParams;
}
static int ZSTD_dedicatedDictSearch_isSupported(
ZSTD_compressionParameters const* cParams)
{
return (cParams->strategy >= ZSTD_greedy)
&& (cParams->strategy <= ZSTD_lazy2)
&& (cParams->hashLog > cParams->chainLog)
&& (cParams->chainLog <= 24);
}
/**
* Reverses the adjustment applied to cparams when enabling dedicated dict
* search. This is used to recover the params set to be used in the working
* context. (Otherwise, those tables would also grow.)
*/
static void ZSTD_dedicatedDictSearch_revertCParams(
ZSTD_compressionParameters* cParams) {
switch (cParams->strategy) {
case ZSTD_fast:
case ZSTD_dfast:
break;
case ZSTD_greedy:
case ZSTD_lazy:
case ZSTD_lazy2:
cParams->hashLog -= ZSTD_LAZY_DDSS_BUCKET_LOG;
if (cParams->hashLog < ZSTD_HASHLOG_MIN) {
cParams->hashLog = ZSTD_HASHLOG_MIN;
}
break;
case ZSTD_btlazy2:
case ZSTD_btopt:
case ZSTD_btultra:
case ZSTD_btultra2:
break;
}
}
static U64 ZSTD_getCParamRowSize(U64 srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode)
{
switch (mode) {
case ZSTD_cpm_unknown:
case ZSTD_cpm_noAttachDict:
case ZSTD_cpm_createCDict:
break;
case ZSTD_cpm_attachDict:
dictSize = 0;
break;
default:
assert(0);
break;
}
{ int const unknown = srcSizeHint == ZSTD_CONTENTSIZE_UNKNOWN;
size_t const addedSize = unknown && dictSize > 0 ? 500 : 0;
return unknown && dictSize == 0 ? ZSTD_CONTENTSIZE_UNKNOWN : srcSizeHint+dictSize+addedSize;
}
}
/*! ZSTD_getCParams_internal() :
* @return ZSTD_compressionParameters structure for a selected compression level, srcSize and dictSize.
* Note: srcSizeHint 0 means 0, use ZSTD_CONTENTSIZE_UNKNOWN for unknown.
* Use dictSize == 0 for unknown or unused.
* Note: `mode` controls how we treat the `dictSize`. See docs for `ZSTD_cParamMode_e`. */
static ZSTD_compressionParameters ZSTD_getCParams_internal(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode)
{
U64 const rSize = ZSTD_getCParamRowSize(srcSizeHint, dictSize, mode);
U32 const tableID = (rSize <= 256 KB) + (rSize <= 128 KB) + (rSize <= 16 KB);
int row;
DEBUGLOG(5, "ZSTD_getCParams_internal (cLevel=%i)", compressionLevel);
/* row */
if (compressionLevel == 0) row = ZSTD_CLEVEL_DEFAULT; /* 0 == default */
else if (compressionLevel < 0) row = 0; /* entry 0 is baseline for fast mode */
else if (compressionLevel > ZSTD_MAX_CLEVEL) row = ZSTD_MAX_CLEVEL;
else row = compressionLevel;
{ ZSTD_compressionParameters cp = ZSTD_defaultCParameters[tableID][row];
DEBUGLOG(5, "ZSTD_getCParams_internal selected tableID: %u row: %u strat: %u", tableID, row, (U32)cp.strategy);
/* acceleration factor */
if (compressionLevel < 0) {
int const clampedCompressionLevel = MAX(ZSTD_minCLevel(), compressionLevel);
cp.targetLength = (unsigned)(-clampedCompressionLevel);
}
/* refine parameters based on srcSize & dictSize */
return ZSTD_adjustCParams_internal(cp, srcSizeHint, dictSize, mode, ZSTD_ps_auto);
}
}
/*! 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 srcSizeHint, size_t dictSize)
{
if (srcSizeHint == 0) srcSizeHint = ZSTD_CONTENTSIZE_UNKNOWN;
return ZSTD_getCParams_internal(compressionLevel, srcSizeHint, dictSize, ZSTD_cpm_unknown);
}
/*! ZSTD_getParams() :
* same idea as ZSTD_getCParams()
* @return a `ZSTD_parameters` structure (instead of `ZSTD_compressionParameters`).
* Fields of `ZSTD_frameParameters` are set to default values */
static ZSTD_parameters ZSTD_getParams_internal(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode) {
ZSTD_parameters params;
ZSTD_compressionParameters const cParams = ZSTD_getCParams_internal(compressionLevel, srcSizeHint, dictSize, mode);
DEBUGLOG(5, "ZSTD_getParams (cLevel=%i)", compressionLevel);
ZSTD_memset(&params, 0, sizeof(params));
params.cParams = cParams;
params.fParams.contentSizeFlag = 1;
return params;
}
/*! ZSTD_getParams() :
* same idea as ZSTD_getCParams()
* @return a `ZSTD_parameters` structure (instead of `ZSTD_compressionParameters`).
* Fields of `ZSTD_frameParameters` are set to default values */
ZSTD_parameters ZSTD_getParams(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize) {
if (srcSizeHint == 0) srcSizeHint = ZSTD_CONTENTSIZE_UNKNOWN;
return ZSTD_getParams_internal(compressionLevel, srcSizeHint, dictSize, ZSTD_cpm_unknown);
}
void ZSTD_registerSequenceProducer(
ZSTD_CCtx* zc,
void* extSeqProdState,
ZSTD_sequenceProducer_F extSeqProdFunc
) {
assert(zc != NULL);
ZSTD_CCtxParams_registerSequenceProducer(
&zc->requestedParams, extSeqProdState, extSeqProdFunc
);
}
void ZSTD_CCtxParams_registerSequenceProducer(
ZSTD_CCtx_params* params,
void* extSeqProdState,
ZSTD_sequenceProducer_F extSeqProdFunc
) {
assert(params != NULL);
if (extSeqProdFunc != NULL) {
params->extSeqProdFunc = extSeqProdFunc;
params->extSeqProdState = extSeqProdState;
} else {
params->extSeqProdFunc = NULL;
params->extSeqProdState = NULL;
}
}
View Git Blame Copy Permalink